1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 extern void init_lookup_list(void);
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 * Enums for cmdline interface *
57 *************************************************/
59 enum commandline_info { CMDINFO_NONE=0,
60 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
65 /*************************************************
66 * Compile regular expression and panic on fail *
67 *************************************************/
69 /* This function is called when failure to compile a regular expression leads
70 to a panic exit. In other cases, pcre_compile() is called directly. In many
71 cases where this function is used, the results of the compilation are to be
72 placed in long-lived store, so we temporarily reset the store management
73 functions that PCRE uses if the use_malloc flag is set.
76 pattern the pattern to compile
77 caseless TRUE if caseless matching is required
78 use_malloc TRUE if compile into malloc store
80 Returns: pointer to the compiled pattern
84 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
87 int options = PCRE_COPT;
92 pcre_malloc = function_store_malloc;
93 pcre_free = function_store_free;
95 if (caseless) options |= PCRE_CASELESS;
96 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
97 pcre_malloc = function_store_get;
98 pcre_free = function_dummy_free;
100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
101 "%s at offset %d while compiling %s", error, offset, pattern);
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings.
116 re the compiled expression
117 subject the subject string
118 options additional PCRE options
119 setup if < 0 do full setup
120 if >= 0 setup from setup+1 onwards,
121 excluding the full matched string
123 Returns: TRUE or FALSE
127 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
129 int ovector[3*(EXPAND_MAXN+1)];
130 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
131 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
133 if (n == 0) n = EXPAND_MAXN + 1;
137 expand_nmax = (setup < 0)? 0 : setup + 1;
138 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
140 expand_nstring[expand_nmax] = subject + ovector[nn];
141 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
151 /*************************************************
152 * Set up processing details *
153 *************************************************/
155 /* Save a text string for dumping when SIGUSR1 is received.
156 Do checks for overruns.
158 Arguments: format and arguments, as for printf()
163 set_process_info(const char *format, ...)
167 sprintf(CS process_info, "%5d ", (int)getpid());
168 len = Ustrlen(process_info);
169 va_start(ap, format);
170 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
171 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
172 len = Ustrlen(process_info);
173 process_info[len+0] = '\n';
174 process_info[len+1] = '\0';
175 process_info_len = len + 1;
176 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
183 /*************************************************
184 * Handler for SIGUSR1 *
185 *************************************************/
187 /* SIGUSR1 causes any exim process to write to the process log details of
188 what it is currently doing. It will only be used if the OS is capable of
189 setting up a handler that causes automatic restarting of any system call
190 that is in progress at the time.
192 This function takes care to be signal-safe.
194 Argument: the signal number (SIGUSR1)
199 usr1_handler(int sig)
203 os_restarting_signal(sig, usr1_handler);
205 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
208 /* If we are already running as the Exim user, try to create it in the
209 current process (assuming spool_directory exists). Otherwise, if we are
210 root, do the creation in an exim:exim subprocess. */
212 int euid = geteuid();
213 if (euid == exim_uid)
214 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
215 else if (euid == root_uid)
216 fd = log_create_as_exim(process_log_path);
219 /* If we are neither exim nor root, or if we failed to create the log file,
220 give up. There is not much useful we can do with errors, since we don't want
221 to disrupt whatever is going on outside the signal handler. */
225 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
231 /*************************************************
233 *************************************************/
235 /* This handler is enabled most of the time that Exim is running. The handler
236 doesn't actually get used unless alarm() has been called to set a timer, to
237 place a time limit on a system call of some kind. When the handler is run, it
240 There are some other SIGALRM handlers that are used in special cases when more
241 than just a flag setting is required; for example, when reading a message's
242 input. These are normally set up in the code module that uses them, and the
243 SIGALRM handler is reset to this one afterwards.
245 Argument: the signal value (SIGALRM)
250 sigalrm_handler(int sig)
252 sig = sig; /* Keep picky compilers happy */
254 os_non_restarting_signal(SIGALRM, sigalrm_handler);
259 /*************************************************
260 * Sleep for a fractional time interval *
261 *************************************************/
263 /* This function is called by millisleep() and exim_wait_tick() to wait for a
264 period of time that may include a fraction of a second. The coding is somewhat
265 tedious. We do not expect setitimer() ever to fail, but if it does, the process
266 will wait for ever, so we panic in this instance. (There was a case of this
267 when a bug in a function that calls milliwait() caused it to pass invalid data.
268 That's when I added the check. :-)
270 Argument: an itimerval structure containing the interval
275 milliwait(struct itimerval *itval)
278 sigset_t old_sigmask;
279 (void)sigemptyset(&sigmask); /* Empty mask */
280 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
281 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
282 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
283 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
284 "setitimer() failed: %s", strerror(errno));
285 (void)sigfillset(&sigmask); /* All signals */
286 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
287 (void)sigsuspend(&sigmask); /* Until SIGALRM */
288 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
294 /*************************************************
295 * Millisecond sleep function *
296 *************************************************/
298 /* The basic sleep() function has a granularity of 1 second, which is too rough
299 in some cases - for example, when using an increasing delay to slow down
302 Argument: number of millseconds
309 struct itimerval itval;
310 itval.it_interval.tv_sec = 0;
311 itval.it_interval.tv_usec = 0;
312 itval.it_value.tv_sec = msec/1000;
313 itval.it_value.tv_usec = (msec % 1000) * 1000;
319 /*************************************************
320 * Compare microsecond times *
321 *************************************************/
328 Returns: -1, 0, or +1
332 exim_tvcmp(struct timeval *t1, struct timeval *t2)
334 if (t1->tv_sec > t2->tv_sec) return +1;
335 if (t1->tv_sec < t2->tv_sec) return -1;
336 if (t1->tv_usec > t2->tv_usec) return +1;
337 if (t1->tv_usec < t2->tv_usec) return -1;
344 /*************************************************
345 * Clock tick wait function *
346 *************************************************/
348 /* Exim uses a time + a pid to generate a unique identifier in two places: its
349 message IDs, and in file names for maildir deliveries. Because some OS now
350 re-use pids within the same second, sub-second times are now being used.
351 However, for absolute certaintly, we must ensure the clock has ticked before
352 allowing the relevant process to complete. At the time of implementation of
353 this code (February 2003), the speed of processors is such that the clock will
354 invariably have ticked already by the time a process has done its job. This
355 function prepares for the time when things are faster - and it also copes with
356 clocks that go backwards.
359 then_tv A timeval which was used to create uniqueness; its usec field
360 has been rounded down to the value of the resolution.
361 We want to be sure the current time is greater than this.
362 resolution The resolution that was used to divide the microseconds
363 (1 for maildir, larger for message ids)
369 exim_wait_tick(struct timeval *then_tv, int resolution)
371 struct timeval now_tv;
372 long int now_true_usec;
374 (void)gettimeofday(&now_tv, NULL);
375 now_true_usec = now_tv.tv_usec;
376 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
378 if (exim_tvcmp(&now_tv, then_tv) <= 0)
380 struct itimerval itval;
381 itval.it_interval.tv_sec = 0;
382 itval.it_interval.tv_usec = 0;
383 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
384 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
386 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
387 negative value for the microseconds is possible only in the case when "now"
388 is more than a second less than "then". That means that itval.it_value.tv_sec
389 is greater than zero. The following correction is therefore safe. */
391 if (itval.it_value.tv_usec < 0)
393 itval.it_value.tv_usec += 1000000;
394 itval.it_value.tv_sec -= 1;
397 DEBUG(D_transport|D_receive)
399 if (!running_in_test_harness)
401 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
402 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
403 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
404 itval.it_value.tv_usec);
415 /*************************************************
416 * Call fopen() with umask 777 and adjust mode *
417 *************************************************/
419 /* Exim runs with umask(0) so that files created with open() have the mode that
420 is specified in the open() call. However, there are some files, typically in
421 the spool directory, that are created with fopen(). They end up world-writeable
422 if no precautions are taken. Although the spool directory is not accessible to
423 the world, this is an untidiness. So this is a wrapper function for fopen()
424 that sorts out the mode of the created file.
427 filename the file name
428 options the fopen() options
429 mode the required mode
431 Returns: the fopened FILE or NULL
435 modefopen(const uschar *filename, const char *options, mode_t mode)
437 mode_t saved_umask = umask(0777);
438 FILE *f = Ufopen(filename, options);
439 (void)umask(saved_umask);
440 if (f != NULL) (void)fchmod(fileno(f), mode);
447 /*************************************************
448 * Ensure stdin, stdout, and stderr exist *
449 *************************************************/
451 /* Some operating systems grumble if an exec() happens without a standard
452 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
453 file will be opened and will use these fd values, and then some other bit of
454 code will assume, for example, that it can write error messages to stderr.
455 This function ensures that fds 0, 1, and 2 are open if they do not already
456 exist, by connecting them to /dev/null.
458 This function is also used to ensure that std{in,out,err} exist at all times,
459 so that if any library that Exim calls tries to use them, it doesn't crash.
471 for (i = 0; i <= 2; i++)
473 if (fstat(i, &statbuf) < 0 && errno == EBADF)
475 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
476 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
477 string_open_failed(errno, "/dev/null"));
478 if (devnull != i) (void)dup2(devnull, i);
481 if (devnull > 2) (void)close(devnull);
487 /*************************************************
488 * Close unwanted file descriptors for delivery *
489 *************************************************/
491 /* This function is called from a new process that has been forked to deliver
492 an incoming message, either directly, or using exec.
494 We want any smtp input streams to be closed in this new process. However, it
495 has been observed that using fclose() here causes trouble. When reading in -bS
496 input, duplicate copies of messages have been seen. The files will be sharing a
497 file pointer with the parent process, and it seems that fclose() (at least on
498 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
499 least sometimes. Hence we go for closing the underlying file descriptors.
501 If TLS is active, we want to shut down the TLS library, but without molesting
502 the parent's SSL connection.
504 For delivery of a non-SMTP message, we want to close stdin and stdout (and
505 stderr unless debugging) because the calling process might have set them up as
506 pipes and be waiting for them to close before it waits for the submission
507 process to terminate. If they aren't closed, they hold up the calling process
508 until the initial delivery process finishes, which is not what we want.
510 Exception: We do want it for synchronous delivery!
512 And notwithstanding all the above, if D_resolver is set, implying resolver
513 debugging, leave stdout open, because that's where the resolver writes its
516 When we close stderr (which implies we've also closed stdout), we also get rid
517 of any controlling terminal.
529 tls_close(TRUE, FALSE); /* Shut down the TLS library */
531 (void)close(fileno(smtp_in));
532 (void)close(fileno(smtp_out));
537 (void)close(0); /* stdin */
538 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
539 if (debug_selector == 0) /* stderr */
541 if (!synchronous_delivery)
554 /*************************************************
556 *************************************************/
558 /* This function sets a new uid and gid permanently, optionally calling
559 initgroups() to set auxiliary groups. There are some special cases when running
560 Exim in unprivileged modes. In these situations the effective uid will not be
561 root; if we already have the right effective uid/gid, and don't need to
562 initialize any groups, leave things as they are.
567 igflag TRUE if initgroups() wanted
568 msg text to use in debugging output and failure log
570 Returns: nothing; bombs out on failure
574 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
576 uid_t euid = geteuid();
577 gid_t egid = getegid();
579 if (euid == root_uid || euid != uid || egid != gid || igflag)
581 /* At least one OS returns +1 for initgroups failure, so just check for
586 struct passwd *pw = getpwuid(uid);
589 if (initgroups(pw->pw_name, gid) != 0)
590 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
591 (long int)uid, strerror(errno));
593 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
594 "no passwd entry for uid=%ld", (long int)uid);
597 if (setgid(gid) < 0 || setuid(uid) < 0)
599 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
600 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
604 /* Debugging output included uid/gid and all groups */
608 int group_count, save_errno;
609 gid_t group_list[NGROUPS_MAX];
610 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
611 (long int)geteuid(), (long int)getegid(), (long int)getpid());
612 group_count = getgroups(NGROUPS_MAX, group_list);
614 debug_printf(" auxiliary group list:");
618 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
620 else if (group_count < 0)
621 debug_printf(" <error: %s>", strerror(save_errno));
622 else debug_printf(" <none>");
630 /*************************************************
632 *************************************************/
634 /* Exim exits via this function so that it always clears up any open
640 Returns: does not return
648 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
649 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
656 /*************************************************
657 * Extract port from host address *
658 *************************************************/
660 /* Called to extract the port from the values given to -oMa and -oMi.
661 It also checks the syntax of the address, and terminates it before the
662 port data when a port is extracted.
665 address the address, with possible port on the end
667 Returns: the port, or zero if there isn't one
668 bombs out on a syntax error
672 check_port(uschar *address)
674 int port = host_address_extract_port(address);
675 if (string_is_ip_address(address, NULL) == 0)
677 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
685 /*************************************************
686 * Test/verify an address *
687 *************************************************/
689 /* This function is called by the -bv and -bt code. It extracts a working
690 address from a full RFC 822 address. This isn't really necessary per se, but it
691 has the effect of collapsing source routes.
695 flags flag bits for verify_address()
696 exit_value to be set for failures
702 test_address(uschar *s, int flags, int *exit_value)
704 int start, end, domain;
705 uschar *parse_error = NULL;
706 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
710 fprintf(stdout, "syntax error: %s\n", parse_error);
715 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
716 -1, -1, NULL, NULL, NULL);
717 if (rc == FAIL) *exit_value = 2;
718 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
724 /*************************************************
725 * Show supported features *
726 *************************************************/
728 /* This function is called for -bV/--version and for -d to output the optional
729 features of the current Exim binary.
731 Arguments: a FILE for printing
736 show_whats_supported(FILE *f)
740 #ifdef DB_VERSION_STRING
741 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
742 #elif defined(BTREEVERSION) && defined(HASHVERSION)
744 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
746 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
748 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
749 fprintf(f, "Probably ndbm\n");
750 #elif defined(USE_TDB)
751 fprintf(f, "Using tdb\n");
754 fprintf(f, "Probably GDBM (native mode)\n");
756 fprintf(f, "Probably GDBM (compatibility mode)\n");
760 fprintf(f, "Support for:");
761 #ifdef SUPPORT_CRYPTEQ
762 fprintf(f, " crypteq");
765 fprintf(f, " iconv()");
770 #ifdef HAVE_SETCLASSRESOURCES
771 fprintf(f, " use_setclassresources");
780 fprintf(f, " Expand_dlfunc");
782 #ifdef USE_TCP_WRAPPERS
783 fprintf(f, " TCPwrappers");
787 fprintf(f, " GnuTLS");
789 fprintf(f, " OpenSSL");
792 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
793 fprintf(f, " translate_ip_address");
795 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
796 fprintf(f, " move_frozen_messages");
798 #ifdef WITH_CONTENT_SCAN
799 fprintf(f, " Content_Scanning");
804 #ifdef WITH_OLD_DEMIME
805 fprintf(f, " Old_Demime");
810 #ifdef EXPERIMENTAL_SPF
811 fprintf(f, " Experimental_SPF");
813 #ifdef EXPERIMENTAL_SRS
814 fprintf(f, " Experimental_SRS");
816 #ifdef EXPERIMENTAL_BRIGHTMAIL
817 fprintf(f, " Experimental_Brightmail");
819 #ifdef EXPERIMENTAL_DCC
820 fprintf(f, " Experimental_DCC");
822 #ifdef EXPERIMENTAL_DMARC
823 fprintf(f, " Experimental_DMARC");
825 #ifdef EXPERIMENTAL_OCSP
826 fprintf(f, " Experimental_OCSP");
828 #ifdef EXPERIMENTAL_PROXY
829 fprintf(f, " Experimental_Proxy");
831 #ifdef EXPERIMENTAL_TPDA
832 fprintf(f, " Experimental_TPDA");
834 #ifdef EXPERIMENTAL_REDIS
835 fprintf(f, " Experimental_Redis");
837 #ifdef EXPERIMENTAL_CERTNAMES
838 fprintf(f, " Experimental_Certnames");
840 #ifdef EXPERIMENTAL_DSN
841 fprintf(f, " Experimental_DSN");
845 fprintf(f, "Lookups (built-in):");
846 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
847 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
849 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
852 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
853 fprintf(f, " dbm dbmjz dbmnz");
855 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
856 fprintf(f, " dnsdb");
858 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
859 fprintf(f, " dsearch");
861 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
862 fprintf(f, " ibase");
864 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
865 fprintf(f, " ldap ldapdn ldapm");
867 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
868 fprintf(f, " mysql");
870 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
871 fprintf(f, " nis nis0");
873 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
874 fprintf(f, " nisplus");
876 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
877 fprintf(f, " oracle");
879 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
880 fprintf(f, " passwd");
882 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
883 fprintf(f, " pgsql");
885 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
886 fprintf(f, " sqlite");
888 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
889 fprintf(f, " testdb");
891 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
892 fprintf(f, " whoson");
896 fprintf(f, "Authenticators:");
898 fprintf(f, " cram_md5");
900 #ifdef AUTH_CYRUS_SASL
901 fprintf(f, " cyrus_sasl");
904 fprintf(f, " dovecot");
907 fprintf(f, " gsasl");
909 #ifdef AUTH_HEIMDAL_GSSAPI
910 fprintf(f, " heimdal_gssapi");
912 #ifdef AUTH_PLAINTEXT
913 fprintf(f, " plaintext");
920 fprintf(f, "Routers:");
922 fprintf(f, " accept");
924 #ifdef ROUTER_DNSLOOKUP
925 fprintf(f, " dnslookup");
927 #ifdef ROUTER_IPLITERAL
928 fprintf(f, " ipliteral");
930 #ifdef ROUTER_IPLOOKUP
931 fprintf(f, " iplookup");
933 #ifdef ROUTER_MANUALROUTE
934 fprintf(f, " manualroute");
936 #ifdef ROUTER_QUERYPROGRAM
937 fprintf(f, " queryprogram");
939 #ifdef ROUTER_REDIRECT
940 fprintf(f, " redirect");
944 fprintf(f, "Transports:");
945 #ifdef TRANSPORT_APPENDFILE
946 fprintf(f, " appendfile");
947 #ifdef SUPPORT_MAILDIR
948 fprintf(f, "/maildir");
950 #ifdef SUPPORT_MAILSTORE
951 fprintf(f, "/mailstore");
957 #ifdef TRANSPORT_AUTOREPLY
958 fprintf(f, " autoreply");
960 #ifdef TRANSPORT_LMTP
963 #ifdef TRANSPORT_PIPE
966 #ifdef TRANSPORT_SMTP
971 if (fixed_never_users[0] > 0)
974 fprintf(f, "Fixed never_users: ");
975 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
976 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
977 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
980 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
982 /* Everything else is details which are only worth reporting when debugging.
983 Perhaps the tls_version_report should move into this too. */
988 /* clang defines __GNUC__ (at least, for me) so test for it first */
989 #if defined(__clang__)
990 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
991 #elif defined(__GNUC__)
992 fprintf(f, "Compiler: GCC [%s]\n",
996 "? unknown version ?"
1000 fprintf(f, "Compiler: <unknown>\n");
1004 tls_version_report(f);
1007 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1008 if (authi->version_report) {
1009 (*authi->version_report)(f);
1013 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1014 characters; unless it's an ancient version of PCRE in which case it
1016 #ifndef PCRE_PRERELEASE
1017 #define PCRE_PRERELEASE
1020 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1021 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1023 PCRE_MAJOR, PCRE_MINOR,
1024 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1027 #undef EXPAND_AND_QUOTE
1030 for (i = 0; i < lookup_list_count; i++)
1032 if (lookup_list[i]->version_report)
1033 lookup_list[i]->version_report(f);
1036 #ifdef WHITELIST_D_MACROS
1037 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1039 fprintf(f, "WHITELIST_D_MACROS unset\n");
1041 #ifdef TRUSTED_CONFIG_LIST
1042 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1044 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1051 /*************************************************
1052 * Show auxiliary information about Exim *
1053 *************************************************/
1056 show_exim_information(enum commandline_info request, FILE *stream)
1063 fprintf(stream, "Oops, something went wrong.\n");
1067 "The -bI: flag takes a string indicating which information to provide.\n"
1068 "If the string is not recognised, you'll get this help (on stderr).\n"
1070 " exim -bI:help this information\n"
1071 " exim -bI:dscp dscp value keywords known\n"
1072 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1076 for (pp = exim_sieve_extension_list; *pp; ++pp)
1077 fprintf(stream, "%s\n", *pp);
1080 dscp_list_to_stream(stream);
1086 /*************************************************
1087 * Quote a local part *
1088 *************************************************/
1090 /* This function is used when a sender address or a From: or Sender: header
1091 line is being created from the caller's login, or from an authenticated_id. It
1092 applies appropriate quoting rules for a local part.
1094 Argument: the local part
1095 Returns: the local part, quoted if necessary
1099 local_part_quote(uschar *lpart)
1101 BOOL needs_quote = FALSE;
1106 for (t = lpart; !needs_quote && *t != 0; t++)
1108 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1109 (*t != '.' || t == lpart || t[1] == 0);
1112 if (!needs_quote) return lpart;
1115 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1119 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1122 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1125 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1126 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1127 yield = string_cat(yield, &size, &ptr, nq, 1);
1131 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1139 /*************************************************
1140 * Load readline() functions *
1141 *************************************************/
1143 /* This function is called from testing executions that read data from stdin,
1144 but only when running as the calling user. Currently, only -be does this. The
1145 function loads the readline() function library and passes back the functions.
1146 On some systems, it needs the curses library, so load that too, but try without
1147 it if loading fails. All this functionality has to be requested at build time.
1150 fn_readline_ptr pointer to where to put the readline pointer
1151 fn_addhist_ptr pointer to where to put the addhistory function
1153 Returns: the dlopen handle or NULL on failure
1157 set_readline(char * (**fn_readline_ptr)(const char *),
1158 void (**fn_addhist_ptr)(const char *))
1161 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1163 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1164 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1166 if (dlhandle != NULL)
1168 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1169 * char * readline (const char *prompt);
1170 * void add_history (const char *string);
1172 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1173 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1177 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1186 /*************************************************
1187 * Get a line from stdin for testing things *
1188 *************************************************/
1190 /* This function is called when running tests that can take a number of lines
1191 of input (for example, -be and -bt). It handles continuations and trailing
1192 spaces. And prompting and a blank line output on eof. If readline() is in use,
1193 the arguments are non-NULL and provide the relevant functions.
1196 fn_readline readline function or NULL
1197 fn_addhist addhist function or NULL
1199 Returns: pointer to dynamic memory, or NULL at end of file
1203 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1208 uschar *yield = NULL;
1210 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1214 uschar buffer[1024];
1218 char *readline_line = NULL;
1219 if (fn_readline != NULL)
1221 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1222 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1223 p = US readline_line;
1228 /* readline() not in use */
1231 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1235 /* Handle the line */
1237 ss = p + (int)Ustrlen(p);
1238 while (ss > p && isspace(ss[-1])) ss--;
1242 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1245 yield = string_cat(yield, &size, &ptr, p, ss - p);
1248 if (fn_readline != NULL) free(readline_line);
1251 if (ss == p || yield[ptr-1] != '\\')
1259 if (yield == NULL) printf("\n");
1265 /*************************************************
1266 * Output usage information for the program *
1267 *************************************************/
1269 /* This function is called when there are no recipients
1270 or a specific --help argument was added.
1273 progname information on what name we were called by
1275 Returns: DOES NOT RETURN
1279 exim_usage(uschar *progname)
1282 /* Handle specific program invocation varients */
1283 if (Ustrcmp(progname, US"-mailq") == 0)
1286 "mailq - list the contents of the mail queue\n\n"
1287 "For a list of options, see the Exim documentation.\n");
1291 /* Generic usage - we output this whatever happens */
1293 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1294 "not directly from a shell command line. Options and/or arguments control\n"
1295 "what it does when called. For a list of options, see the Exim documentation.\n");
1302 /*************************************************
1303 * Validate that the macros given are okay *
1304 *************************************************/
1306 /* Typically, Exim will drop privileges if macros are supplied. In some
1307 cases, we want to not do so.
1309 Arguments: none (macros is a global)
1310 Returns: true if trusted, false otherwise
1314 macros_trusted(void)
1316 #ifdef WHITELIST_D_MACROS
1318 uschar *whitelisted, *end, *p, **whites, **w;
1319 int white_count, i, n;
1321 BOOL prev_char_item, found;
1326 #ifndef WHITELIST_D_MACROS
1330 /* We only trust -D overrides for some invoking users:
1331 root, the exim run-time user, the optional config owner user.
1332 I don't know why config-owner would be needed, but since they can own the
1333 config files anyway, there's no security risk to letting them override -D. */
1334 if ( ! ((real_uid == root_uid)
1335 || (real_uid == exim_uid)
1336 #ifdef CONFIGURE_OWNER
1337 || (real_uid == config_uid)
1341 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1345 /* Get a list of macros which are whitelisted */
1346 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1347 prev_char_item = FALSE;
1349 for (p = whitelisted; *p != '\0'; ++p)
1351 if (*p == ':' || isspace(*p))
1356 prev_char_item = FALSE;
1359 if (!prev_char_item)
1360 prev_char_item = TRUE;
1367 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1368 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1373 if (i == white_count)
1375 while (*p != '\0' && p < end)
1381 /* The list of macros should be very short. Accept the N*M complexity. */
1382 for (m = macros; m != NULL; m = m->next)
1385 for (w = whites; *w; ++w)
1386 if (Ustrcmp(*w, m->name) == 0)
1393 if (m->replacement == NULL)
1395 len = Ustrlen(m->replacement);
1398 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1399 0, PCRE_EOPT, NULL, 0);
1402 if (n != PCRE_ERROR_NOMATCH)
1403 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1407 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1413 /*************************************************
1414 * Entry point and high-level code *
1415 *************************************************/
1417 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1418 the appropriate action. All the necessary functions are present in the one
1419 binary. I originally thought one should split it up, but it turns out that so
1420 much of the apparatus is needed in each chunk that one might as well just have
1421 it all available all the time, which then makes the coding easier as well.
1424 argc count of entries in argv
1425 argv argument strings, with argv[0] being the program name
1427 Returns: EXIT_SUCCESS if terminated successfully
1428 EXIT_FAILURE otherwise, except when a message has been sent
1429 to the sender, and -oee was given
1433 main(int argc, char **cargv)
1435 uschar **argv = USS cargv;
1436 int arg_receive_timeout = -1;
1437 int arg_smtp_receive_timeout = -1;
1438 int arg_error_handling = error_handling;
1439 int filter_sfd = -1;
1440 int filter_ufd = -1;
1443 int list_queue_option = 0;
1445 int msg_action_arg = -1;
1446 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1447 int queue_only_reason = 0;
1449 int perl_start_option = 0;
1451 int recipients_arg = argc;
1452 int sender_address_domain = 0;
1453 int test_retry_arg = -1;
1454 int test_rewrite_arg = -1;
1455 BOOL arg_queue_only = FALSE;
1456 BOOL bi_option = FALSE;
1457 BOOL checking = FALSE;
1458 BOOL count_queue = FALSE;
1459 BOOL expansion_test = FALSE;
1460 BOOL extract_recipients = FALSE;
1461 BOOL flag_G = FALSE;
1462 BOOL flag_n = FALSE;
1463 BOOL forced_delivery = FALSE;
1464 BOOL f_end_dot = FALSE;
1465 BOOL deliver_give_up = FALSE;
1466 BOOL list_queue = FALSE;
1467 BOOL list_options = FALSE;
1468 BOOL local_queue_only;
1470 BOOL one_msg_action = FALSE;
1471 BOOL queue_only_set = FALSE;
1472 BOOL receiving_message = TRUE;
1473 BOOL sender_ident_set = FALSE;
1474 BOOL session_local_queue_only;
1476 BOOL removed_privilege = FALSE;
1477 BOOL usage_wanted = FALSE;
1478 BOOL verify_address_mode = FALSE;
1479 BOOL verify_as_sender = FALSE;
1480 BOOL version_printed = FALSE;
1481 uschar *alias_arg = NULL;
1482 uschar *called_as = US"";
1483 uschar *cmdline_syslog_name = NULL;
1484 uschar *start_queue_run_id = NULL;
1485 uschar *stop_queue_run_id = NULL;
1486 uschar *expansion_test_message = NULL;
1487 uschar *ftest_domain = NULL;
1488 uschar *ftest_localpart = NULL;
1489 uschar *ftest_prefix = NULL;
1490 uschar *ftest_suffix = NULL;
1491 uschar *malware_test_file = NULL;
1492 uschar *real_sender_address;
1493 uschar *originator_home = US"/";
1498 struct stat statbuf;
1499 pid_t passed_qr_pid = (pid_t)0;
1500 int passed_qr_pipe = -1;
1501 gid_t group_list[NGROUPS_MAX];
1503 /* For the -bI: flag */
1504 enum commandline_info info_flag = CMDINFO_NONE;
1505 BOOL info_stdout = FALSE;
1507 /* Possible options for -R and -S */
1509 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1511 /* Need to define this in case we need to change the environment in order
1512 to get rid of a bogus time zone. We have to make it char rather than uschar
1513 because some OS define it in /usr/include/unistd.h. */
1515 extern char **environ;
1517 /* If the Exim user and/or group and/or the configuration file owner/group were
1518 defined by ref:name at build time, we must now find the actual uid/gid values.
1519 This is a feature to make the lives of binary distributors easier. */
1521 #ifdef EXIM_USERNAME
1522 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1526 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1530 /* If ref:name uses a number as the name, route_finduser() returns
1531 TRUE with exim_uid set and pw coerced to NULL. */
1533 exim_gid = pw->pw_gid;
1534 #ifndef EXIM_GROUPNAME
1538 "exim: ref:name should specify a usercode, not a group.\n"
1539 "exim: can't let you get away with it unless you also specify a group.\n");
1546 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1552 #ifdef EXIM_GROUPNAME
1553 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1555 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1561 #ifdef CONFIGURE_OWNERNAME
1562 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1564 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1565 CONFIGURE_OWNERNAME);
1570 /* We default the system_filter_user to be the Exim run-time user, as a
1571 sane non-root value. */
1572 system_filter_uid = exim_uid;
1574 #ifdef CONFIGURE_GROUPNAME
1575 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1577 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1578 CONFIGURE_GROUPNAME);
1583 /* In the Cygwin environment, some initialization needs doing. It is fudged
1584 in by means of this macro. */
1590 /* Check a field which is patched when we are running Exim within its
1591 testing harness; do a fast initial check, and then the whole thing. */
1593 running_in_test_harness =
1594 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1596 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1597 at the start of a program; however, it seems that some environments do not
1598 follow this. A "strange" locale can affect the formatting of timestamps, so we
1601 setlocale(LC_ALL, "C");
1603 /* Set up the default handler for timing using alarm(). */
1605 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1607 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1608 because store_malloc writes a log entry on failure. */
1610 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1611 if (log_buffer == NULL)
1613 fprintf(stderr, "exim: failed to get store for log buffer\n");
1617 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1618 NULL when the daemon is run and the file is closed. We have to use this
1619 indirection, because some systems don't allow writing to the variable "stderr".
1622 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1624 /* Arrange for the PCRE regex library to use our store functions. Note that
1625 the normal calls are actually macros that add additional arguments for
1626 debugging purposes so we have to assign specially constructed functions here.
1627 The default is to use store in the stacking pool, but this is overridden in the
1628 regex_must_compile() function. */
1630 pcre_malloc = function_store_get;
1631 pcre_free = function_dummy_free;
1633 /* Ensure there is a big buffer for temporary use in several places. It is put
1634 in malloc store so that it can be freed for enlargement if necessary. */
1636 big_buffer = store_malloc(big_buffer_size);
1638 /* Set up the handler for the data request signal, and set the initial
1639 descriptive text. */
1641 set_process_info("initializing");
1642 os_restarting_signal(SIGUSR1, usr1_handler);
1644 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1645 in the daemon code. For the rest of Exim's uses, we ignore it. */
1647 signal(SIGHUP, SIG_IGN);
1649 /* We don't want to die on pipe errors as the code is written to handle
1650 the write error instead. */
1652 signal(SIGPIPE, SIG_IGN);
1654 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1655 set to SIG_IGN. This causes subprocesses that complete before the parent
1656 process waits for them not to hang around, so when Exim calls wait(), nothing
1657 is there. The wait() code has been made robust against this, but let's ensure
1658 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1659 ending status. We use sigaction rather than plain signal() on those OS where
1660 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1661 problem on AIX with this.) */
1665 struct sigaction act;
1666 act.sa_handler = SIG_DFL;
1667 sigemptyset(&(act.sa_mask));
1669 sigaction(SIGCHLD, &act, NULL);
1672 signal(SIGCHLD, SIG_DFL);
1675 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1680 /* Set up the version number. Set up the leading 'E' for the external form of
1681 message ids, set the pointer to the internal form, and initialize it to
1682 indicate no message being processed. */
1685 message_id_option[0] = '-';
1686 message_id_external = message_id_option + 1;
1687 message_id_external[0] = 'E';
1688 message_id = message_id_external + 1;
1691 /* Set the umask to zero so that any files Exim creates using open() are
1692 created with the modes that it specifies. NOTE: Files created with fopen() have
1693 a problem, which was not recognized till rather late (February 2006). With this
1694 umask, such files will be world writeable. (They are all content scanning files
1695 in the spool directory, which isn't world-accessible, so this is not a
1696 disaster, but it's untidy.) I don't want to change this overall setting,
1697 however, because it will interact badly with the open() calls. Instead, there's
1698 now a function called modefopen() that fiddles with the umask while calling
1703 /* Precompile the regular expression for matching a message id. Keep this in
1704 step with the code that generates ids in the accept.c module. We need to do
1705 this here, because the -M options check their arguments for syntactic validity
1706 using mac_ismsgid, which uses this. */
1709 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1711 /* Precompile the regular expression that is used for matching an SMTP error
1712 code, possibly extended, at the start of an error message. Note that the
1713 terminating whitespace character is included. */
1716 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1719 #ifdef WHITELIST_D_MACROS
1720 /* Precompile the regular expression used to filter the content of macros
1721 given to -D for permissibility. */
1723 regex_whitelisted_macro =
1724 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1728 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1729 this seems to be a generally accepted convention, since one finds symbolic
1730 links called "mailq" in standard OS configurations. */
1732 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1733 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1736 receiving_message = FALSE;
1737 called_as = US"-mailq";
1740 /* If the program is called as "rmail" treat it as equivalent to
1741 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1742 i.e. preventing a single dot on a line from terminating the message, and
1743 returning with zero return code, even in cases of error (provided an error
1744 message has been sent). */
1746 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1747 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1750 called_as = US"-rmail";
1751 errors_sender_rc = EXIT_SUCCESS;
1754 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1755 this is a smail convention. */
1757 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1758 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1760 smtp_input = smtp_batched_input = TRUE;
1761 called_as = US"-rsmtp";
1764 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1765 this is a smail convention. */
1767 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1768 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1771 receiving_message = FALSE;
1772 called_as = US"-runq";
1775 /* If the program is called as "newaliases" treat it as equivalent to
1776 "exim -bi"; this is a sendmail convention. */
1778 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1779 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1782 receiving_message = FALSE;
1783 called_as = US"-newaliases";
1786 /* Save the original effective uid for a couple of uses later. It should
1787 normally be root, but in some esoteric environments it may not be. */
1789 original_euid = geteuid();
1791 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1792 to be the same as the real ones. This makes a difference only if Exim is setuid
1793 (or setgid) to something other than root, which could be the case in some
1794 special configurations. */
1796 real_uid = getuid();
1797 real_gid = getgid();
1799 if (real_uid == root_uid)
1801 rv = setgid(real_gid);
1804 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1805 (long int)real_gid, strerror(errno));
1808 rv = setuid(real_uid);
1811 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1812 (long int)real_uid, strerror(errno));
1817 /* If neither the original real uid nor the original euid was root, Exim is
1818 running in an unprivileged state. */
1820 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1822 /* Scan the program's arguments. Some can be dealt with right away; others are
1823 simply recorded for checking and handling afterwards. Do a high-level switch
1824 on the second character (the one after '-'), to save some effort. */
1826 for (i = 1; i < argc; i++)
1828 BOOL badarg = FALSE;
1829 uschar *arg = argv[i];
1833 /* An argument not starting with '-' is the start of a recipients list;
1834 break out of the options-scanning loop. */
1842 /* An option consistion of -- terminates the options */
1844 if (Ustrcmp(arg, "--") == 0)
1846 recipients_arg = i + 1;
1850 /* Handle flagged options */
1852 switchchar = arg[1];
1855 /* Make all -ex options synonymous with -oex arguments, since that
1856 is assumed by various callers. Also make -qR options synonymous with -R
1857 options, as that seems to be required as well. Allow for -qqR too, and
1858 the same for -S options. */
1860 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1861 Ustrncmp(arg+1, "qR", 2) == 0 ||
1862 Ustrncmp(arg+1, "qS", 2) == 0)
1864 switchchar = arg[2];
1867 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1869 switchchar = arg[3];
1871 queue_2stage = TRUE;
1874 /* Make -r synonymous with -f, since it is a documented alias */
1876 else if (arg[1] == 'r') switchchar = 'f';
1878 /* Make -ov synonymous with -v */
1880 else if (Ustrcmp(arg, "-ov") == 0)
1886 /* deal with --option_aliases */
1887 else if (switchchar == '-')
1889 if (Ustrcmp(argrest, "help") == 0)
1891 usage_wanted = TRUE;
1894 else if (Ustrcmp(argrest, "version") == 0)
1901 /* High-level switch on active initial letter */
1906 /* sendmail uses -Ac and -Am to control which .cf file is used;
1909 if (*argrest == '\0') { badarg = TRUE; break; }
1912 BOOL ignore = FALSE;
1917 if (*(argrest + 1) == '\0')
1921 if (!ignore) { badarg = TRUE; break; }
1925 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1926 so has no need of it. */
1929 if (*argrest == 0) i++; /* Skip over the type */
1934 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1936 /* -bd: Run in daemon mode, awaiting SMTP connections.
1937 -bdf: Ditto, but in the foreground.
1940 if (*argrest == 'd')
1942 daemon_listen = TRUE;
1943 if (*(++argrest) == 'f') background_daemon = FALSE;
1944 else if (*argrest != 0) { badarg = TRUE; break; }
1947 /* -be: Run in expansion test mode
1948 -bem: Ditto, but read a message from a file first
1951 else if (*argrest == 'e')
1953 expansion_test = checking = TRUE;
1954 if (argrest[1] == 'm')
1956 if (++i >= argc) { badarg = TRUE; break; }
1957 expansion_test_message = argv[i];
1960 if (argrest[1] != 0) { badarg = TRUE; break; }
1963 /* -bF: Run system filter test */
1965 else if (*argrest == 'F')
1967 filter_test |= FTEST_SYSTEM;
1968 if (*(++argrest) != 0) { badarg = TRUE; break; }
1969 if (++i < argc) filter_test_sfile = argv[i]; else
1971 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1976 /* -bf: Run user filter test
1977 -bfd: Set domain for filter testing
1978 -bfl: Set local part for filter testing
1979 -bfp: Set prefix for filter testing
1980 -bfs: Set suffix for filter testing
1983 else if (*argrest == 'f')
1985 if (*(++argrest) == 0)
1987 filter_test |= FTEST_USER;
1988 if (++i < argc) filter_test_ufile = argv[i]; else
1990 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1998 fprintf(stderr, "exim: string expected after %s\n", arg);
2001 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2002 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2003 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2004 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2005 else { badarg = TRUE; break; }
2009 /* -bh: Host checking - an IP address must follow. */
2011 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2013 if (++i >= argc) { badarg = TRUE; break; }
2014 sender_host_address = argv[i];
2015 host_checking = checking = log_testing_mode = TRUE;
2016 host_checking_callout = argrest[1] == 'c';
2019 /* -bi: This option is used by sendmail to initialize *the* alias file,
2020 though it has the -oA option to specify a different file. Exim has no
2021 concept of *the* alias file, but since Sun's YP make script calls
2022 sendmail this way, some support must be provided. */
2024 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2026 /* -bI: provide information, of the type to follow after a colon.
2027 This is an Exim flag. */
2029 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2031 uschar *p = &argrest[2];
2032 info_flag = CMDINFO_HELP;
2035 if (strcmpic(p, CUS"sieve") == 0)
2037 info_flag = CMDINFO_SIEVE;
2040 else if (strcmpic(p, CUS"dscp") == 0)
2042 info_flag = CMDINFO_DSCP;
2045 else if (strcmpic(p, CUS"help") == 0)
2052 /* -bm: Accept and deliver message - the default option. Reinstate
2053 receiving_message, which got turned off for all -b options. */
2055 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2057 /* -bmalware: test the filename given for malware */
2059 else if (Ustrcmp(argrest, "malware") == 0)
2061 if (++i >= argc) { badarg = TRUE; break; }
2062 malware_test_file = argv[i];
2065 /* -bnq: For locally originating messages, do not qualify unqualified
2066 addresses. In the envelope, this causes errors; in header lines they
2069 else if (Ustrcmp(argrest, "nq") == 0)
2071 allow_unqualified_sender = FALSE;
2072 allow_unqualified_recipient = FALSE;
2075 /* -bpxx: List the contents of the mail queue, in various forms. If
2076 the option is -bpc, just a queue count is needed. Otherwise, if the
2077 first letter after p is r, then order is random. */
2079 else if (*argrest == 'p')
2081 if (*(++argrest) == 'c')
2084 if (*(++argrest) != 0) badarg = TRUE;
2088 if (*argrest == 'r')
2090 list_queue_option = 8;
2093 else list_queue_option = 0;
2097 /* -bp: List the contents of the mail queue, top-level only */
2099 if (*argrest == 0) {}
2101 /* -bpu: List the contents of the mail queue, top-level undelivered */
2103 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2105 /* -bpa: List the contents of the mail queue, including all delivered */
2107 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2109 /* Unknown after -bp[r] */
2119 /* -bP: List the configuration variables given as the address list.
2120 Force -v, so configuration errors get displayed. */
2122 else if (Ustrcmp(argrest, "P") == 0)
2124 list_options = TRUE;
2125 debug_selector |= D_v;
2126 debug_file = stderr;
2129 /* -brt: Test retry configuration lookup */
2131 else if (Ustrcmp(argrest, "rt") == 0)
2133 test_retry_arg = i + 1;
2137 /* -brw: Test rewrite configuration */
2139 else if (Ustrcmp(argrest, "rw") == 0)
2141 test_rewrite_arg = i + 1;
2145 /* -bS: Read SMTP commands on standard input, but produce no replies -
2146 all errors are reported by sending messages. */
2148 else if (Ustrcmp(argrest, "S") == 0)
2149 smtp_input = smtp_batched_input = receiving_message = TRUE;
2151 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2152 on standard output. */
2154 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2156 /* -bt: address testing mode */
2158 else if (Ustrcmp(argrest, "t") == 0)
2159 address_test_mode = checking = log_testing_mode = TRUE;
2161 /* -bv: verify addresses */
2163 else if (Ustrcmp(argrest, "v") == 0)
2164 verify_address_mode = checking = log_testing_mode = TRUE;
2166 /* -bvs: verify sender addresses */
2168 else if (Ustrcmp(argrest, "vs") == 0)
2170 verify_address_mode = checking = log_testing_mode = TRUE;
2171 verify_as_sender = TRUE;
2174 /* -bV: Print version string and support details */
2176 else if (Ustrcmp(argrest, "V") == 0)
2178 printf("Exim version %s #%s built %s\n", version_string,
2179 version_cnumber, version_date);
2180 printf("%s\n", CS version_copyright);
2181 version_printed = TRUE;
2182 show_whats_supported(stdout);
2185 /* -bw: inetd wait mode, accept a listening socket as stdin */
2187 else if (*argrest == 'w')
2189 inetd_wait_mode = TRUE;
2190 background_daemon = FALSE;
2191 daemon_listen = TRUE;
2192 if (*(++argrest) != '\0')
2194 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2195 if (inetd_wait_timeout <= 0)
2197 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2207 /* -C: change configuration file list; ignore if it isn't really
2208 a change! Enforce a prefix check if required. */
2213 if(++i < argc) argrest = argv[i]; else
2214 { badarg = TRUE; break; }
2216 if (Ustrcmp(config_main_filelist, argrest) != 0)
2218 #ifdef ALT_CONFIG_PREFIX
2220 int len = Ustrlen(ALT_CONFIG_PREFIX);
2221 uschar *list = argrest;
2223 while((filename = string_nextinlist(&list, &sep, big_buffer,
2224 big_buffer_size)) != NULL)
2226 if ((Ustrlen(filename) < len ||
2227 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2228 Ustrstr(filename, "/../") != NULL) &&
2229 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2231 fprintf(stderr, "-C Permission denied\n");
2236 if (real_uid != root_uid)
2238 #ifdef TRUSTED_CONFIG_LIST
2240 if (real_uid != exim_uid
2241 #ifdef CONFIGURE_OWNER
2242 && real_uid != config_uid
2245 trusted_config = FALSE;
2248 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2251 struct stat statbuf;
2253 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2254 (statbuf.st_uid != root_uid /* owner not root */
2255 #ifdef CONFIGURE_OWNER
2256 && statbuf.st_uid != config_uid /* owner not the special one */
2259 (statbuf.st_gid != root_gid /* group not root */
2260 #ifdef CONFIGURE_GROUP
2261 && statbuf.st_gid != config_gid /* group not the special one */
2263 && (statbuf.st_mode & 020) != 0 /* group writeable */
2265 (statbuf.st_mode & 2) != 0) /* world writeable */
2267 trusted_config = FALSE;
2272 /* Well, the trust list at least is up to scratch... */
2273 void *reset_point = store_get(0);
2274 uschar *trusted_configs[32];
2278 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2280 uschar *start = big_buffer, *nl;
2281 while (*start && isspace(*start))
2285 nl = Ustrchr(start, '\n');
2288 trusted_configs[nr_configs++] = string_copy(start);
2289 if (nr_configs == 32)
2297 uschar *list = argrest;
2299 while (trusted_config && (filename = string_nextinlist(&list,
2300 &sep, big_buffer, big_buffer_size)) != NULL)
2302 for (i=0; i < nr_configs; i++)
2304 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2307 if (i == nr_configs)
2309 trusted_config = FALSE;
2313 store_reset(reset_point);
2317 /* No valid prefixes found in trust_list file. */
2318 trusted_config = FALSE;
2324 /* Could not open trust_list file. */
2325 trusted_config = FALSE;
2329 /* Not root; don't trust config */
2330 trusted_config = FALSE;
2334 config_main_filelist = argrest;
2335 config_changed = TRUE;
2340 /* -D: set up a macro definition */
2343 #ifdef DISABLE_D_OPTION
2344 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2349 macro_item *mlast = NULL;
2352 uschar *s = argrest;
2354 while (isspace(*s)) s++;
2356 if (*s < 'A' || *s > 'Z')
2358 fprintf(stderr, "exim: macro name set by -D must start with "
2359 "an upper case letter\n");
2363 while (isalnum(*s) || *s == '_')
2365 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2369 if (ptr == 0) { badarg = TRUE; break; }
2370 while (isspace(*s)) s++;
2373 if (*s++ != '=') { badarg = TRUE; break; }
2374 while (isspace(*s)) s++;
2377 for (m = macros; m != NULL; m = m->next)
2379 if (Ustrcmp(m->name, name) == 0)
2381 fprintf(stderr, "exim: duplicated -D in command line\n");
2387 m = store_get(sizeof(macro_item) + Ustrlen(name));
2389 m->command_line = TRUE;
2390 if (mlast == NULL) macros = m; else mlast->next = m;
2391 Ustrcpy(m->name, name);
2392 m->replacement = string_copy(s);
2394 if (clmacro_count >= MAX_CLMACROS)
2396 fprintf(stderr, "exim: too many -D options on command line\n");
2399 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2405 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2406 The latter is now a no-op, retained for compatibility only. If -dd is used,
2407 debugging subprocesses of the daemon is disabled. */
2410 if (Ustrcmp(argrest, "ropcr") == 0)
2412 /* drop_cr = TRUE; */
2415 /* Use an intermediate variable so that we don't set debugging while
2416 decoding the debugging bits. */
2420 unsigned int selector = D_default;
2423 if (*argrest == 'd')
2425 debug_daemon = TRUE;
2429 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2430 debug_options_count, US"debug", 0);
2431 debug_selector = selector;
2436 /* -E: This is a local error message. This option is not intended for
2437 external use at all, but is not restricted to trusted callers because it
2438 does no harm (just suppresses certain error messages) and if Exim is run
2439 not setuid root it won't always be trusted when it generates error
2440 messages using this option. If there is a message id following -E, point
2441 message_reference at it, for logging. */
2444 local_error_message = TRUE;
2445 if (mac_ismsgid(argrest)) message_reference = argrest;
2449 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2450 option, so it looks as if historically the -oex options are also callable
2451 without the leading -o. So we have to accept them. Before the switch,
2452 anything starting -oe has been converted to -e. Exim does not support all
2453 of the sendmail error options. */
2456 if (Ustrcmp(argrest, "e") == 0)
2458 arg_error_handling = ERRORS_SENDER;
2459 errors_sender_rc = EXIT_SUCCESS;
2461 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2462 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2463 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2464 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2469 /* -F: Set sender's full name, used instead of the gecos entry from
2470 the password file. Since users can usually alter their gecos entries,
2471 there's no security involved in using this instead. The data can follow
2472 the -F or be in the next argument. */
2477 if(++i < argc) argrest = argv[i]; else
2478 { badarg = TRUE; break; }
2480 originator_name = argrest;
2481 sender_name_forced = TRUE;
2485 /* -f: Set sender's address - this value is only actually used if Exim is
2486 run by a trusted user, or if untrusted_set_sender is set and matches the
2487 address, except that the null address can always be set by any user. The
2488 test for this happens later, when the value given here is ignored when not
2489 permitted. For an untrusted user, the actual sender is still put in Sender:
2490 if it doesn't match the From: header (unless no_local_from_check is set).
2491 The data can follow the -f or be in the next argument. The -r switch is an
2492 obsolete form of -f but since there appear to be programs out there that
2493 use anything that sendmail has ever supported, better accept it - the
2494 synonymizing is done before the switch above.
2496 At this stage, we must allow domain literal addresses, because we don't
2497 know what the setting of allow_domain_literals is yet. Ditto for trailing
2498 dots and strip_trailing_dot. */
2506 if (i+1 < argc) argrest = argv[++i]; else
2507 { badarg = TRUE; break; }
2511 sender_address = string_sprintf(""); /* Ensure writeable memory */
2515 uschar *temp = argrest + Ustrlen(argrest) - 1;
2516 while (temp >= argrest && isspace(*temp)) temp--;
2517 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2518 allow_domain_literals = TRUE;
2519 strip_trailing_dot = TRUE;
2520 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2521 &sender_address_domain, TRUE);
2522 allow_domain_literals = FALSE;
2523 strip_trailing_dot = FALSE;
2524 if (sender_address == NULL)
2526 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2527 return EXIT_FAILURE;
2530 sender_address_forced = TRUE;
2534 /* -G: sendmail invocation to specify that it's a gateway submission and
2535 sendmail may complain about problems instead of fixing them.
2536 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2537 not at this time complain about problems. */
2543 /* -h: Set the hop count for an incoming message. Exim does not currently
2544 support this; it always computes it by counting the Received: headers.
2545 To put it in will require a change to the spool header file format. */
2550 if(++i < argc) argrest = argv[i]; else
2551 { badarg = TRUE; break; }
2553 if (!isdigit(*argrest)) badarg = TRUE;
2557 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2558 not to be documented for sendmail but mailx (at least) uses it) */
2561 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2565 /* -L: set the identifier used for syslog; equivalent to setting
2566 syslog_processname in the config file, but needs to be an admin option. */
2569 if (*argrest == '\0')
2571 if(++i < argc) argrest = argv[i]; else
2572 { badarg = TRUE; break; }
2574 sz = Ustrlen(argrest);
2577 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2578 return EXIT_FAILURE;
2582 fprintf(stderr, "exim: the -L syslog name is too short\n");
2583 return EXIT_FAILURE;
2585 cmdline_syslog_name = argrest;
2589 receiving_message = FALSE;
2591 /* -MC: continue delivery of another message via an existing open
2592 file descriptor. This option is used for an internal call by the
2593 smtp transport when there is a pending message waiting to go to an
2594 address to which it has got a connection. Five subsequent arguments are
2595 required: transport name, host name, IP address, sequence number, and
2596 message_id. Transports may decline to create new processes if the sequence
2597 number gets too big. The channel is stdin. This (-MC) must be the last
2598 argument. There's a subsequent check that the real-uid is privileged.
2600 If we are running in the test harness. delay for a bit, to let the process
2601 that set this one up complete. This makes for repeatability of the logging,
2604 if (Ustrcmp(argrest, "C") == 0)
2606 union sockaddr_46 interface_sock;
2607 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2611 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2612 return EXIT_FAILURE;
2615 if (msg_action_arg >= 0)
2617 fprintf(stderr, "exim: incompatible arguments\n");
2618 return EXIT_FAILURE;
2621 continue_transport = argv[++i];
2622 continue_hostname = argv[++i];
2623 continue_host_address = argv[++i];
2624 continue_sequence = Uatoi(argv[++i]);
2625 msg_action = MSG_DELIVER;
2626 msg_action_arg = ++i;
2627 forced_delivery = TRUE;
2628 queue_run_pid = passed_qr_pid;
2629 queue_run_pipe = passed_qr_pipe;
2631 if (!mac_ismsgid(argv[i]))
2633 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2635 return EXIT_FAILURE;
2638 /* Set up $sending_ip_address and $sending_port */
2640 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2642 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2646 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2648 return EXIT_FAILURE;
2651 if (running_in_test_harness) millisleep(500);
2655 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2656 precedes -MC (see above). The flag indicates that the host to which
2657 Exim is connected has accepted an AUTH sequence. */
2659 else if (Ustrcmp(argrest, "CA") == 0)
2661 smtp_authenticated = TRUE;
2665 #ifdef EXPERIMENTAL_DSN
2666 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2667 that exim is connected to supports the esmtp extension DSN */
2668 else if (strcmp(argrest, "CD") == 0)
2670 smtp_use_dsn = TRUE;
2675 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2676 it preceded -MC (see above) */
2678 else if (Ustrcmp(argrest, "CP") == 0)
2680 smtp_use_pipelining = TRUE;
2684 /* -MCQ: pass on the pid of the queue-running process that started
2685 this chain of deliveries and the fd of its synchronizing pipe; this
2686 is useful only when it precedes -MC (see above) */
2688 else if (Ustrcmp(argrest, "CQ") == 0)
2690 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2692 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2697 /* -MCS: set the smtp_use_size flag; this is useful only when it
2698 precedes -MC (see above) */
2700 else if (Ustrcmp(argrest, "CS") == 0)
2702 smtp_use_size = TRUE;
2706 /* -MCT: set the tls_offered flag; this is useful only when it
2707 precedes -MC (see above). The flag indicates that the host to which
2708 Exim is connected has offered TLS support. */
2711 else if (Ustrcmp(argrest, "CT") == 0)
2718 /* -M[x]: various operations on the following list of message ids:
2719 -M deliver the messages, ignoring next retry times and thawing
2720 -Mc deliver the messages, checking next retry times, no thawing
2721 -Mf freeze the messages
2722 -Mg give up on the messages
2723 -Mt thaw the messages
2724 -Mrm remove the messages
2725 In the above cases, this must be the last option. There are also the
2726 following options which are followed by a single message id, and which
2727 act on that message. Some of them use the "recipient" addresses as well.
2728 -Mar add recipient(s)
2729 -Mmad mark all recipients delivered
2730 -Mmd mark recipients(s) delivered
2732 -Mset load a message for use with -be
2734 -Mvc show copy (of whole message, in RFC 2822 format)
2739 else if (*argrest == 0)
2741 msg_action = MSG_DELIVER;
2742 forced_delivery = deliver_force_thaw = TRUE;
2744 else if (Ustrcmp(argrest, "ar") == 0)
2746 msg_action = MSG_ADD_RECIPIENT;
2747 one_msg_action = TRUE;
2749 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2750 else if (Ustrcmp(argrest, "es") == 0)
2752 msg_action = MSG_EDIT_SENDER;
2753 one_msg_action = TRUE;
2755 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2756 else if (Ustrcmp(argrest, "g") == 0)
2758 msg_action = MSG_DELIVER;
2759 deliver_give_up = TRUE;
2761 else if (Ustrcmp(argrest, "mad") == 0)
2763 msg_action = MSG_MARK_ALL_DELIVERED;
2765 else if (Ustrcmp(argrest, "md") == 0)
2767 msg_action = MSG_MARK_DELIVERED;
2768 one_msg_action = TRUE;
2770 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2771 else if (Ustrcmp(argrest, "set") == 0)
2773 msg_action = MSG_LOAD;
2774 one_msg_action = TRUE;
2776 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2777 else if (Ustrcmp(argrest, "vb") == 0)
2779 msg_action = MSG_SHOW_BODY;
2780 one_msg_action = TRUE;
2782 else if (Ustrcmp(argrest, "vc") == 0)
2784 msg_action = MSG_SHOW_COPY;
2785 one_msg_action = TRUE;
2787 else if (Ustrcmp(argrest, "vh") == 0)
2789 msg_action = MSG_SHOW_HEADER;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "vl") == 0)
2794 msg_action = MSG_SHOW_LOG;
2795 one_msg_action = TRUE;
2797 else { badarg = TRUE; break; }
2799 /* All the -Mxx options require at least one message id. */
2801 msg_action_arg = i + 1;
2802 if (msg_action_arg >= argc)
2804 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2805 return EXIT_FAILURE;
2808 /* Some require only message ids to follow */
2810 if (!one_msg_action)
2813 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2815 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2817 return EXIT_FAILURE;
2819 goto END_ARG; /* Remaining args are ids */
2822 /* Others require only one message id, possibly followed by addresses,
2823 which will be handled as normal arguments. */
2827 if (!mac_ismsgid(argv[msg_action_arg]))
2829 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2830 argv[msg_action_arg], arg);
2831 return EXIT_FAILURE;
2838 /* Some programs seem to call the -om option without the leading o;
2839 for sendmail it askes for "me too". Exim always does this. */
2842 if (*argrest != 0) badarg = TRUE;
2846 /* -N: don't do delivery - a debugging option that stops transports doing
2847 their thing. It implies debugging at the D_v level. */
2852 dont_deliver = TRUE;
2853 debug_selector |= D_v;
2854 debug_file = stderr;
2860 /* -n: This means "don't alias" in sendmail, apparently.
2861 For normal invocations, it has no effect.
2862 It may affect some other options. */
2868 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2869 option to the specified value. This form uses long names. We need to handle
2870 -O option=value and -Ooption=value. */
2877 fprintf(stderr, "exim: string expected after -O\n");
2885 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2888 if (*argrest == 'A')
2890 alias_arg = argrest + 1;
2891 if (alias_arg[0] == 0)
2893 if (i+1 < argc) alias_arg = argv[++i]; else
2895 fprintf(stderr, "exim: string expected after -oA\n");
2901 /* -oB: Set a connection message max value for remote deliveries */
2903 else if (*argrest == 'B')
2905 uschar *p = argrest + 1;
2908 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2910 connection_max_messages = 1;
2919 fprintf(stderr, "exim: number expected after -oB\n");
2922 connection_max_messages = Uatoi(p);
2926 /* -odb: background delivery */
2928 else if (Ustrcmp(argrest, "db") == 0)
2930 synchronous_delivery = FALSE;
2931 arg_queue_only = FALSE;
2932 queue_only_set = TRUE;
2935 /* -odf: foreground delivery (smail-compatible option); same effect as
2936 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2939 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2941 synchronous_delivery = TRUE;
2942 arg_queue_only = FALSE;
2943 queue_only_set = TRUE;
2946 /* -odq: queue only */
2948 else if (Ustrcmp(argrest, "dq") == 0)
2950 synchronous_delivery = FALSE;
2951 arg_queue_only = TRUE;
2952 queue_only_set = TRUE;
2955 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2956 but no remote delivery */
2958 else if (Ustrcmp(argrest, "dqs") == 0)
2961 arg_queue_only = FALSE;
2962 queue_only_set = TRUE;
2965 /* -oex: Sendmail error flags. As these are also accepted without the
2966 leading -o prefix, for compatibility with vacation and other callers,
2967 they are handled with -e above. */
2969 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2970 -oitrue: Another sendmail syntax for the same */
2972 else if (Ustrcmp(argrest, "i") == 0 ||
2973 Ustrcmp(argrest, "itrue") == 0)
2976 /* -oM*: Set various characteristics for an incoming message; actually
2977 acted on for trusted callers only. */
2979 else if (*argrest == 'M')
2983 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2987 /* -oMa: Set sender host address */
2989 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2991 /* -oMaa: Set authenticator name */
2993 else if (Ustrcmp(argrest, "Maa") == 0)
2994 sender_host_authenticated = argv[++i];
2996 /* -oMas: setting authenticated sender */
2998 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3000 /* -oMai: setting authenticated id */
3002 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3004 /* -oMi: Set incoming interface address */
3006 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3008 /* -oMm: Message reference */
3010 else if (Ustrcmp(argrest, "Mm") == 0)
3012 if (!mac_ismsgid(argv[i+1]))
3014 fprintf(stderr,"-oMm must be a valid message ID\n");
3017 if (!trusted_config)
3019 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3022 message_reference = argv[++i];
3025 /* -oMr: Received protocol */
3027 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3029 /* -oMs: Set sender host name */
3031 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3033 /* -oMt: Set sender ident */
3035 else if (Ustrcmp(argrest, "Mt") == 0)
3037 sender_ident_set = TRUE;
3038 sender_ident = argv[++i];
3041 /* Else a bad argument */
3050 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3051 seem to call this as -m (undocumented), so that is also accepted (see
3054 else if (Ustrcmp(argrest, "m") == 0) {}
3056 /* -oo: An ancient flag for old-style addresses which still seems to
3057 crop up in some calls (see in SCO). */
3059 else if (Ustrcmp(argrest, "o") == 0) {}
3061 /* -oP <name>: set pid file path for daemon */
3063 else if (Ustrcmp(argrest, "P") == 0)
3064 override_pid_file_path = argv[++i];
3066 /* -or <n>: set timeout for non-SMTP acceptance
3067 -os <n>: set timeout for SMTP acceptance */
3069 else if (*argrest == 'r' || *argrest == 's')
3071 int *tp = (*argrest == 'r')?
3072 &arg_receive_timeout : &arg_smtp_receive_timeout;
3073 if (argrest[1] == 0)
3075 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3077 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3080 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3085 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3087 else if (Ustrcmp(argrest, "X") == 0)
3088 override_local_interfaces = argv[++i];
3090 /* Unknown -o argument */
3096 /* -ps: force Perl startup; -pd force delayed Perl startup */
3100 if (*argrest == 's' && argrest[1] == 0)
3102 perl_start_option = 1;
3105 if (*argrest == 'd' && argrest[1] == 0)
3107 perl_start_option = -1;
3112 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3113 which sets the host protocol and host name */
3117 if (i+1 < argc) argrest = argv[++i]; else
3118 { badarg = TRUE; break; }
3123 uschar *hn = Ustrchr(argrest, ':');
3126 received_protocol = argrest;
3130 received_protocol = string_copyn(argrest, hn - argrest);
3131 sender_host_name = hn + 1;
3138 receiving_message = FALSE;
3139 if (queue_interval >= 0)
3141 fprintf(stderr, "exim: -q specified more than once\n");
3145 /* -qq...: Do queue runs in a 2-stage manner */
3147 if (*argrest == 'q')
3149 queue_2stage = TRUE;
3153 /* -qi...: Do only first (initial) deliveries */
3155 if (*argrest == 'i')
3157 queue_run_first_delivery = TRUE;
3161 /* -qf...: Run the queue, forcing deliveries
3162 -qff..: Ditto, forcing thawing as well */
3164 if (*argrest == 'f')
3166 queue_run_force = TRUE;
3167 if (*(++argrest) == 'f')
3169 deliver_force_thaw = TRUE;
3174 /* -q[f][f]l...: Run the queue only on local deliveries */
3176 if (*argrest == 'l')
3178 queue_run_local = TRUE;
3182 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3183 optionally starting from a given message id. */
3185 if (*argrest == 0 &&
3186 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3189 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3190 start_queue_run_id = argv[++i];
3191 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3192 stop_queue_run_id = argv[++i];
3195 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3196 optionally local only. */
3201 queue_interval = readconf_readtime(argrest, 0, FALSE);
3203 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3204 if (queue_interval <= 0)
3206 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3213 case 'R': /* Synonymous with -qR... */
3214 receiving_message = FALSE;
3216 /* -Rf: As -R (below) but force all deliveries,
3217 -Rff: Ditto, but also thaw all frozen messages,
3218 -Rr: String is regex
3219 -Rrf: Regex and force
3220 -Rrff: Regex and force and thaw
3222 in all cases provided there are no further characters in this
3228 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3230 if (Ustrcmp(argrest, rsopts[i]) == 0)
3232 if (i != 2) queue_run_force = TRUE;
3233 if (i >= 2) deliver_selectstring_regex = TRUE;
3234 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3235 argrest += Ustrlen(rsopts[i]);
3240 /* -R: Set string to match in addresses for forced queue run to
3241 pick out particular messages. */
3245 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3247 fprintf(stderr, "exim: string expected after -R\n");
3251 else deliver_selectstring = argrest;
3255 /* -r: an obsolete synonym for -f (see above) */
3258 /* -S: Like -R but works on sender. */
3260 case 'S': /* Synonymous with -qS... */
3261 receiving_message = FALSE;
3263 /* -Sf: As -S (below) but force all deliveries,
3264 -Sff: Ditto, but also thaw all frozen messages,
3265 -Sr: String is regex
3266 -Srf: Regex and force
3267 -Srff: Regex and force and thaw
3269 in all cases provided there are no further characters in this
3275 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3277 if (Ustrcmp(argrest, rsopts[i]) == 0)
3279 if (i != 2) queue_run_force = TRUE;
3280 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3281 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3282 argrest += Ustrlen(rsopts[i]);
3287 /* -S: Set string to match in addresses for forced queue run to
3288 pick out particular messages. */
3292 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3294 fprintf(stderr, "exim: string expected after -S\n");
3298 else deliver_selectstring_sender = argrest;
3301 /* -Tqt is an option that is exclusively for use by the testing suite.
3302 It is not recognized in other circumstances. It allows for the setting up
3303 of explicit "queue times" so that various warning/retry things can be
3304 tested. Otherwise variability of clock ticks etc. cause problems. */
3307 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3308 fudged_queue_times = argv[++i];
3313 /* -t: Set flag to extract recipients from body of message. */
3316 if (*argrest == 0) extract_recipients = TRUE;
3318 /* -ti: Set flag to extract recipients from body of message, and also
3319 specify that dot does not end the message. */
3321 else if (Ustrcmp(argrest, "i") == 0)
3323 extract_recipients = TRUE;
3327 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3330 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3337 /* -U: This means "initial user submission" in sendmail, apparently. The
3338 doc claims that in future sendmail may refuse syntactically invalid
3339 messages instead of fixing them. For the moment, we just ignore it. */
3345 /* -v: verify things - this is a very low-level debugging */
3350 debug_selector |= D_v;
3351 debug_file = stderr;
3357 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3359 The -x flag tells the sendmail command that mail from a local
3360 mail program has National Language Support (NLS) extended characters
3361 in the body of the mail item. The sendmail command can send mail with
3362 extended NLS characters across networks that normally corrupts these
3365 As Exim is 8-bit clean, it just ignores this flag. */
3368 if (*argrest != 0) badarg = TRUE;
3371 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3372 logs to that file. We swallow the parameter and otherwise ignore it. */
3375 if (*argrest == '\0')
3379 fprintf(stderr, "exim: string expected after -X\n");
3385 /* All other initial characters are errors */
3390 } /* End of high-level switch statement */
3392 /* Failed to recognize the option, or syntax error */
3396 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3397 "option %s\n", arg);
3403 /* If -R or -S have been specified without -q, assume a single queue run. */
3405 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3406 queue_interval < 0) queue_interval = 0;
3410 /* If usage_wanted is set we call the usage function - which never returns */
3411 if (usage_wanted) exim_usage(called_as);
3413 /* Arguments have been processed. Check for incompatibilities. */
3415 (smtp_input || extract_recipients || recipients_arg < argc) &&
3416 (daemon_listen || queue_interval >= 0 || bi_option ||
3417 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3418 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3421 msg_action_arg > 0 &&
3422 (daemon_listen || queue_interval >= 0 || list_options ||
3423 (checking && msg_action != MSG_LOAD) ||
3424 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3427 (daemon_listen || queue_interval >= 0) &&
3428 (sender_address != NULL || list_options || list_queue || checking ||
3432 daemon_listen && queue_interval == 0
3435 inetd_wait_mode && queue_interval >= 0
3439 (checking || smtp_input || extract_recipients ||
3440 filter_test != FTEST_NONE || bi_option)
3443 verify_address_mode &&
3444 (address_test_mode || smtp_input || extract_recipients ||
3445 filter_test != FTEST_NONE || bi_option)
3448 address_test_mode && (smtp_input || extract_recipients ||
3449 filter_test != FTEST_NONE || bi_option)
3452 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3456 deliver_selectstring != NULL && queue_interval < 0
3459 msg_action == MSG_LOAD &&
3460 (!expansion_test || expansion_test_message != NULL)
3464 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3468 /* If debugging is set up, set the file and the file descriptor to pass on to
3469 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3470 to run in the foreground. */
3472 if (debug_selector != 0)
3474 debug_file = stderr;
3475 debug_fd = fileno(debug_file);
3476 background_daemon = FALSE;
3477 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3478 if (debug_selector != D_v) /* -v only doesn't show this */
3480 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3481 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3483 if (!version_printed)
3484 show_whats_supported(stderr);
3488 /* When started with root privilege, ensure that the limits on the number of
3489 open files and the number of processes (where that is accessible) are
3490 sufficiently large, or are unset, in case Exim has been called from an
3491 environment where the limits are screwed down. Not all OS have the ability to
3492 change some of these limits. */
3496 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3502 #ifdef RLIMIT_NOFILE
3503 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3505 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3507 rlp.rlim_cur = rlp.rlim_max = 0;
3510 /* I originally chose 1000 as a nice big number that was unlikely to
3511 be exceeded. It turns out that some older OS have a fixed upper limit of
3514 if (rlp.rlim_cur < 1000)
3516 rlp.rlim_cur = rlp.rlim_max = 1000;
3517 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3519 rlp.rlim_cur = rlp.rlim_max = 256;
3520 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3521 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3528 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3530 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3532 rlp.rlim_cur = rlp.rlim_max = 0;
3535 #ifdef RLIM_INFINITY
3536 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3538 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3540 if (rlp.rlim_cur < 1000)
3542 rlp.rlim_cur = rlp.rlim_max = 1000;
3544 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3545 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3551 /* Exim is normally entered as root (but some special configurations are
3552 possible that don't do this). However, it always spins off sub-processes that
3553 set their uid and gid as required for local delivery. We don't want to pass on
3554 any extra groups that root may belong to, so we want to get rid of them all at
3557 We need to obey setgroups() at this stage, before possibly giving up root
3558 privilege for a changed configuration file, but later on we might need to
3559 check on the additional groups for the admin user privilege - can't do that
3560 till after reading the config, which might specify the exim gid. Therefore,
3561 save the group list here first. */
3563 group_count = getgroups(NGROUPS_MAX, group_list);
3564 if (group_count < 0)
3566 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3570 /* There is a fundamental difference in some BSD systems in the matter of
3571 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3572 known not to be different. On the "different" systems there is a single group
3573 list, and the first entry in it is the current group. On all other versions of
3574 Unix there is a supplementary group list, which is in *addition* to the current
3575 group. Consequently, to get rid of all extraneous groups on a "standard" system
3576 you pass over 0 groups to setgroups(), while on a "different" system you pass
3577 over a single group - the current group, which is always the first group in the
3578 list. Calling setgroups() with zero groups on a "different" system results in
3579 an error return. The following code should cope with both types of system.
3581 However, if this process isn't running as root, setgroups() can't be used
3582 since you have to be root to run it, even if throwing away groups. Not being
3583 root here happens only in some unusual configurations. We just ignore the
3586 if (setgroups(0, NULL) != 0)
3588 if (setgroups(1, group_list) != 0 && !unprivileged)
3590 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3595 /* If the configuration file name has been altered by an argument on the
3596 command line (either a new file name or a macro definition) and the caller is
3597 not root, or if this is a filter testing run, remove any setuid privilege the
3598 program has and run as the underlying user.
3600 The exim user is locked out of this, which severely restricts the use of -C
3603 Otherwise, set the real ids to the effective values (should be root unless run
3604 from inetd, which it can either be root or the exim uid, if one is configured).
3606 There is a private mechanism for bypassing some of this, in order to make it
3607 possible to test lots of configurations automatically, without having either to
3608 recompile each time, or to patch in an actual configuration file name and other
3609 values (such as the path name). If running in the test harness, pretend that
3610 configuration file changes and macro definitions haven't happened. */
3613 (!trusted_config || /* Config changed, or */
3614 !macros_trusted()) && /* impermissible macros and */
3615 real_uid != root_uid && /* Not root, and */
3616 !running_in_test_harness /* Not fudged */
3618 expansion_test /* expansion testing */
3620 filter_test != FTEST_NONE) /* Filter testing */
3622 setgroups(group_count, group_list);
3623 exim_setugid(real_uid, real_gid, FALSE,
3624 US"-C, -D, -be or -bf forces real uid");
3625 removed_privilege = TRUE;
3627 /* In the normal case when Exim is called like this, stderr is available
3628 and should be used for any logging information because attempts to write
3629 to the log will usually fail. To arrange this, we unset really_exim. However,
3630 if no stderr is available there is no point - we might as well have a go
3631 at the log (if it fails, syslog will be written).
3633 Note that if the invoker is Exim, the logs remain available. Messing with
3634 this causes unlogged successful deliveries. */
3636 if ((log_stderr != NULL) && (real_uid != exim_uid))
3637 really_exim = FALSE;
3640 /* Privilege is to be retained for the moment. It may be dropped later,
3641 depending on the job that this Exim process has been asked to do. For now, set
3642 the real uid to the effective so that subsequent re-execs of Exim are done by a
3645 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3647 /* If testing a filter, open the file(s) now, before wasting time doing other
3648 setups and reading the message. */
3650 if ((filter_test & FTEST_SYSTEM) != 0)
3652 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3655 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3657 return EXIT_FAILURE;
3661 if ((filter_test & FTEST_USER) != 0)
3663 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3666 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3668 return EXIT_FAILURE;
3672 /* Initialise lookup_list
3673 If debugging, already called above via version reporting.
3674 In either case, we initialise the list of available lookups while running
3675 as root. All dynamically modules are loaded from a directory which is
3676 hard-coded into the binary and is code which, if not a module, would be
3677 part of Exim already. Ability to modify the content of the directory
3678 is equivalent to the ability to modify a setuid binary!
3680 This needs to happen before we read the main configuration. */
3683 /* Read the main runtime configuration data; this gives up if there
3684 is a failure. It leaves the configuration file open so that the subsequent
3685 configuration data for delivery can be read if needed. */
3689 /* If an action on specific messages is requested, or if a daemon or queue
3690 runner is being started, we need to know if Exim was called by an admin user.
3691 This is the case if the real user is root or exim, or if the real group is
3692 exim, or if one of the supplementary groups is exim or a group listed in
3693 admin_groups. We don't fail all message actions immediately if not admin_user,
3694 since some actions can be performed by non-admin users. Instead, set admin_user
3695 for later interrogation. */
3697 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3702 for (i = 0; i < group_count; i++)
3704 if (group_list[i] == exim_gid) admin_user = TRUE;
3705 else if (admin_groups != NULL)
3707 for (j = 1; j <= (int)(admin_groups[0]); j++)
3708 if (admin_groups[j] == group_list[i])
3709 { admin_user = TRUE; break; }
3711 if (admin_user) break;
3715 /* Another group of privileged users are the trusted users. These are root,
3716 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3717 are permitted to specify sender_addresses with -f on the command line, and
3718 other message parameters as well. */
3720 if (real_uid == root_uid || real_uid == exim_uid)
3721 trusted_caller = TRUE;
3726 if (trusted_users != NULL)
3728 for (i = 1; i <= (int)(trusted_users[0]); i++)
3729 if (trusted_users[i] == real_uid)
3730 { trusted_caller = TRUE; break; }
3733 if (!trusted_caller && trusted_groups != NULL)
3735 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3737 if (trusted_groups[i] == real_gid)
3738 trusted_caller = TRUE;
3739 else for (j = 0; j < group_count; j++)
3741 if (trusted_groups[i] == group_list[j])
3742 { trusted_caller = TRUE; break; }
3744 if (trusted_caller) break;
3749 /* Handle the decoding of logging options. */
3751 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3752 log_selector_string, log_options, log_options_count, US"log", 0);
3756 debug_printf("configuration file is %s\n", config_main_filename);
3757 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3758 log_extra_selector);
3761 /* If domain literals are not allowed, check the sender address that was
3762 supplied with -f. Ditto for a stripped trailing dot. */
3764 if (sender_address != NULL)
3766 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3768 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3769 "allowed\n", sender_address);
3770 return EXIT_FAILURE;
3772 if (f_end_dot && !strip_trailing_dot)
3774 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3775 "(trailing dot not allowed)\n", sender_address);
3776 return EXIT_FAILURE;
3780 /* See if an admin user overrode our logging. */
3782 if (cmdline_syslog_name != NULL)
3786 syslog_processname = cmdline_syslog_name;
3787 log_file_path = string_copy(CUS"syslog");
3791 /* not a panic, non-privileged users should not be able to spam paniclog */
3793 "exim: you lack sufficient privilege to specify syslog process name\n");
3794 return EXIT_FAILURE;
3798 /* Paranoia check of maximum lengths of certain strings. There is a check
3799 on the length of the log file path in log.c, which will come into effect
3800 if there are any calls to write the log earlier than this. However, if we
3801 get this far but the string is very long, it is better to stop now than to
3802 carry on and (e.g.) receive a message and then have to collapse. The call to
3803 log_write() from here will cause the ultimate panic collapse if the complete
3804 file name exceeds the buffer length. */
3806 if (Ustrlen(log_file_path) > 200)
3807 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3808 "log_file_path is longer than 200 chars: aborting");
3810 if (Ustrlen(pid_file_path) > 200)
3811 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3812 "pid_file_path is longer than 200 chars: aborting");
3814 if (Ustrlen(spool_directory) > 200)
3815 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3816 "spool_directory is longer than 200 chars: aborting");
3818 /* Length check on the process name given to syslog for its TAG field,
3819 which is only permitted to be 32 characters or less. See RFC 3164. */
3821 if (Ustrlen(syslog_processname) > 32)
3822 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3823 "syslog_processname is longer than 32 chars: aborting");
3825 /* In some operating systems, the environment variable TMPDIR controls where
3826 temporary files are created; Exim doesn't use these (apart from when delivering
3827 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3828 If TMPDIR is found in the environment, reset it to the value defined in the
3829 TMPDIR macro, if this macro is defined. */
3834 for (p = USS environ; *p != NULL; p++)
3836 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3837 Ustrcmp(*p+7, TMPDIR) != 0)
3839 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3840 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3842 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3848 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3849 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3850 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3851 called by a user who has set the TZ variable. This then affects the timestamps
3852 in log files and in Received: headers, and any created Date: header lines. The
3853 required timezone is settable in the configuration file, so nothing can be done
3854 about this earlier - but hopefully nothing will normally be logged earlier than
3855 this. We have to make a new environment if TZ is wrong, but don't bother if
3856 timestamps_utc is set, because then all times are in UTC anyway. */
3858 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3860 timestamps_utc = TRUE;
3864 uschar *envtz = US getenv("TZ");
3865 if ((envtz == NULL && timezone_string != NULL) ||
3867 (timezone_string == NULL ||
3868 Ustrcmp(timezone_string, envtz) != 0)))
3870 uschar **p = USS environ;
3874 while (*p++ != NULL) count++;
3875 if (envtz == NULL) count++;
3876 newp = new = malloc(sizeof(uschar *) * (count + 1));
3877 for (p = USS environ; *p != NULL; p++)
3879 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3882 if (timezone_string != NULL)
3884 *newp = malloc(Ustrlen(timezone_string) + 4);
3885 sprintf(CS *newp++, "TZ=%s", timezone_string);
3890 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3891 tod_stamp(tod_log));
3895 /* Handle the case when we have removed the setuid privilege because of -C or
3896 -D. This means that the caller of Exim was not root.
3898 There is a problem if we were running as the Exim user. The sysadmin may
3899 expect this case to retain privilege because "the binary was called by the
3900 Exim user", but it hasn't, because either the -D option set macros, or the
3901 -C option set a non-trusted configuration file. There are two possibilities:
3903 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3904 to do message deliveries. Thus, the fact that it is running as a
3905 non-privileged user is plausible, and might be wanted in some special
3906 configurations. However, really_exim will have been set false when
3907 privilege was dropped, to stop Exim trying to write to its normal log
3908 files. Therefore, re-enable normal log processing, assuming the sysadmin
3909 has set up the log directory correctly.
3911 (2) If deliver_drop_privilege is not set, the configuration won't work as
3912 apparently intended, and so we log a panic message. In order to retain
3913 root for -C or -D, the caller must either be root or be invoking a
3914 trusted configuration file (when deliver_drop_privilege is false). */
3916 if (removed_privilege && (!trusted_config || macros != NULL) &&
3917 real_uid == exim_uid)
3919 if (deliver_drop_privilege)
3920 really_exim = TRUE; /* let logging work normally */
3922 log_write(0, LOG_MAIN|LOG_PANIC,
3923 "exim user lost privilege for using %s option",
3924 trusted_config? "-D" : "-C");
3927 /* Start up Perl interpreter if Perl support is configured and there is a
3928 perl_startup option, and the configuration or the command line specifies
3929 initializing starting. Note that the global variables are actually called
3930 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3933 if (perl_start_option != 0)
3934 opt_perl_at_start = (perl_start_option > 0);
3935 if (opt_perl_at_start && opt_perl_startup != NULL)
3938 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3939 errstr = init_perl(opt_perl_startup);
3942 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3943 return EXIT_FAILURE;
3945 opt_perl_started = TRUE;
3947 #endif /* EXIM_PERL */
3949 /* Log the arguments of the call if the configuration file said so. This is
3950 a debugging feature for finding out what arguments certain MUAs actually use.
3951 Don't attempt it if logging is disabled, or if listing variables or if
3952 verifying/testing addresses or expansions. */
3954 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3955 && really_exim && !list_options && !checking)
3958 uschar *p = big_buffer;
3960 Ustrcpy(p, "cwd= (failed)");
3961 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3963 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3965 for (i = 0; i < argc; i++)
3967 int len = Ustrlen(argv[i]);
3970 if (p + len + 8 >= big_buffer + big_buffer_size)
3973 log_write(0, LOG_MAIN, "%s", big_buffer);
3974 Ustrcpy(big_buffer, "...");
3977 printing = string_printing(argv[i]);
3978 if (printing[0] == 0) quote = US"\""; else
3980 uschar *pp = printing;
3982 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3984 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3985 (p - big_buffer) - 4), printing, quote);
3989 if ((log_extra_selector & LX_arguments) != 0)
3990 log_write(0, LOG_MAIN, "%s", big_buffer);
3992 debug_printf("%s\n", big_buffer);
3995 /* Set the working directory to be the top-level spool directory. We don't rely
3996 on this in the code, which always uses fully qualified names, but it's useful
3997 for core dumps etc. Don't complain if it fails - the spool directory might not
3998 be generally accessible and calls with the -C option (and others) have lost
3999 privilege by now. Before the chdir, we try to ensure that the directory exists.
4002 if (Uchdir(spool_directory) != 0)
4005 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4006 dummy = /* quieten compiler */ Uchdir(spool_directory);
4009 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4010 alias file. Exim doesn't have such a concept, but this call is screwed into
4011 Sun's YP makefiles. Handle this by calling a configured script, as the real
4012 user who called Exim. The -oA option can be used to pass an argument to the
4017 (void)fclose(config_file);
4018 if (bi_command != NULL)
4022 argv[i++] = bi_command;
4023 if (alias_arg != NULL) argv[i++] = alias_arg;
4026 setgroups(group_count, group_list);
4027 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4029 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4030 (argv[1] == NULL)? US"" : argv[1]);
4032 execv(CS argv[0], (char *const *)argv);
4033 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4038 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4043 /* We moved the admin/trusted check to be immediately after reading the
4044 configuration file. We leave these prints here to ensure that syslog setup,
4045 logfile setup, and so on has already happened. */
4047 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4048 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4050 /* Only an admin user may start the daemon or force a queue run in the default
4051 configuration, but the queue run restriction can be relaxed. Only an admin
4052 user may request that a message be returned to its sender forthwith. Only an
4053 admin user may specify a debug level greater than D_v (because it might show
4054 passwords, etc. in lookup queries). Only an admin user may request a queue
4055 count. Only an admin user can use the test interface to scan for email
4056 (because Exim will be in the spool dir and able to look at mails). */
4060 BOOL debugset = (debug_selector & ~D_v) != 0;
4061 if (deliver_give_up || daemon_listen || malware_test_file ||
4062 (count_queue && queue_list_requires_admin) ||
4063 (list_queue && queue_list_requires_admin) ||
4064 (queue_interval >= 0 && prod_requires_admin) ||
4065 (debugset && !running_in_test_harness))
4067 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4072 /* If the real user is not root or the exim uid, the argument for passing
4073 in an open TCP/IP connection for another message is not permitted, nor is
4074 running with the -N option for any delivery action, unless this call to exim is
4075 one that supplied an input message, or we are using a patched exim for
4076 regression testing. */
4078 if (real_uid != root_uid && real_uid != exim_uid &&
4079 (continue_hostname != NULL ||
4081 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4082 )) && !running_in_test_harness)
4084 fprintf(stderr, "exim: Permission denied\n");
4085 return EXIT_FAILURE;
4088 /* If the caller is not trusted, certain arguments are ignored when running for
4089 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4090 Note that authority for performing certain actions on messages is tested in the
4091 queue_action() function. */
4093 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4095 sender_host_name = sender_host_address = interface_address =
4096 sender_ident = received_protocol = NULL;
4097 sender_host_port = interface_port = 0;
4098 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4101 /* If a sender host address is set, extract the optional port number off the
4102 end of it and check its syntax. Do the same thing for the interface address.
4103 Exim exits if the syntax is bad. */
4107 if (sender_host_address != NULL)
4108 sender_host_port = check_port(sender_host_address);
4109 if (interface_address != NULL)
4110 interface_port = check_port(interface_address);
4113 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4118 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4119 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4123 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4124 return EXIT_FAILURE;
4128 /* If an SMTP message is being received check to see if the standard input is a
4129 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4130 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4135 union sockaddr_46 inetd_sock;
4136 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4137 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4139 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4140 if (family == AF_INET || family == AF_INET6)
4142 union sockaddr_46 interface_sock;
4143 size = sizeof(interface_sock);
4145 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4146 interface_address = host_ntoa(-1, &interface_sock, NULL,
4149 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4151 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4154 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4155 NULL, &sender_host_port);
4156 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4157 "inetd is not supported when mua_wrapper is set");
4162 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4163 return EXIT_FAILURE;
4169 /* If the load average is going to be needed while receiving a message, get it
4170 now for those OS that require the first call to os_getloadavg() to be done as
4171 root. There will be further calls later for each message received. */
4173 #ifdef LOAD_AVG_NEEDS_ROOT
4174 if (receiving_message &&
4175 (queue_only_load >= 0 ||
4176 (is_inetd && smtp_load_reserve >= 0)
4179 load_average = OS_GETLOADAVG();
4183 /* The queue_only configuration option can be overridden by -odx on the command
4184 line, except that if queue_only_override is false, queue_only cannot be unset
4185 from the command line. */
4187 if (queue_only_set && (queue_only_override || arg_queue_only))
4188 queue_only = arg_queue_only;
4190 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4193 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4194 if (arg_smtp_receive_timeout >= 0)
4195 smtp_receive_timeout = arg_smtp_receive_timeout;
4197 /* If Exim was started with root privilege, unless we have already removed the
4198 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4199 except when starting the daemon or doing some kind of delivery or address
4200 testing (-bt). These are the only cases when root need to be retained. We run
4201 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4202 retained only for starting the daemon. We always do the initgroups() in this
4203 situation (controlled by the TRUE below), in order to be as close as possible
4204 to the state Exim usually runs in. */
4206 if (!unprivileged && /* originally had root AND */
4207 !removed_privilege && /* still got root AND */
4208 !daemon_listen && /* not starting the daemon */
4209 queue_interval <= 0 && /* (either kind of daemon) */
4211 deliver_drop_privilege || /* requested unprivileged */
4213 queue_interval < 0 && /* not running the queue */
4214 (msg_action_arg < 0 || /* and */
4215 msg_action != MSG_DELIVER) && /* not delivering and */
4216 (!checking || !address_test_mode) /* not address checking */
4220 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4223 /* When we are retaining a privileged uid, we still change to the exim gid. */
4228 rv = setgid(exim_gid);
4229 /* Impact of failure is that some stuff might end up with an incorrect group.
4230 We track this for failures from root, since any attempt to change privilege
4231 by root should succeed and failures should be examined. For non-root,
4232 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4233 no need to complain then. */
4236 if (!(unprivileged || removed_privilege))
4239 "exim: changing group failed: %s\n", strerror(errno));
4243 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4244 (long int)exim_gid, strerror(errno));
4248 /* Handle a request to scan a file for malware */
4249 if (malware_test_file)
4251 #ifdef WITH_CONTENT_SCAN
4253 set_process_info("scanning file for malware");
4254 result = malware_in_file(malware_test_file);
4257 printf("No malware found.\n");
4262 printf("Malware lookup returned non-okay/fail: %d\n", result);
4266 printf("Malware found: %s\n", malware_name);
4268 printf("Malware scan detected malware of unknown name.\n");
4270 printf("Malware scanning not enabled at compile time.\n");
4275 /* Handle a request to list the delivery queue */
4279 set_process_info("listing the queue");
4280 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4284 /* Handle a request to count the delivery queue */
4288 set_process_info("counting the queue");
4293 /* Handle actions on specific messages, except for the force delivery and
4294 message load actions, which are done below. Some actions take a whole list of
4295 message ids, which are known to continue up to the end of the arguments. Others
4296 take a single message id and then operate on the recipients list. */
4298 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4300 int yield = EXIT_SUCCESS;
4301 set_process_info("acting on specified messages");
4303 if (!one_msg_action)
4305 for (i = msg_action_arg; i < argc; i++)
4306 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4307 yield = EXIT_FAILURE;
4310 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4311 recipients_arg)) yield = EXIT_FAILURE;
4315 /* We used to set up here to skip reading the ACL section, on
4316 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4317 Now, since the intro of the ${acl } expansion, ACL definitions may be
4318 needed in transports so we lost the optimisation. */
4322 /* The configuration data will have been read into POOL_PERM because we won't
4323 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4324 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4325 configuration were read into POOL_MAIN, because we don't do any resets till
4326 later on. However, it seems right, and it does ensure that both pools get used.
4329 store_pool = POOL_MAIN;
4331 /* Handle the -brt option. This is for checking out retry configurations.
4332 The next three arguments are a domain name or a complete address, and
4333 optionally two error numbers. All it does is to call the function that
4334 scans the retry configuration data. */
4336 if (test_retry_arg >= 0)
4338 retry_config *yield;
4339 int basic_errno = 0;
4343 if (test_retry_arg >= argc)
4345 printf("-brt needs a domain or address argument\n");
4346 exim_exit(EXIT_FAILURE);
4348 s1 = argv[test_retry_arg++];
4351 /* If the first argument contains no @ and no . it might be a local user
4352 or it might be a single-component name. Treat as a domain. */
4354 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4356 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4357 "being \ntreated as a one-component domain, not as a local part.\n\n",
4361 /* There may be an optional second domain arg. */
4363 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4364 s2 = argv[test_retry_arg++];
4366 /* The final arg is an error name */
4368 if (test_retry_arg < argc)
4370 uschar *ss = argv[test_retry_arg];
4372 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4375 printf("%s\n", CS error);
4376 return EXIT_FAILURE;
4379 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4380 code > 100 as an error is for matching codes to the decade. Turn them into
4381 a real error code, off the decade. */
4383 if (basic_errno == ERRNO_MAIL4XX ||
4384 basic_errno == ERRNO_RCPT4XX ||
4385 basic_errno == ERRNO_DATA4XX)
4387 int code = (more_errno >> 8) & 255;
4389 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4390 else if (code > 100)
4391 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4395 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4396 if (yield == NULL) printf("No retry information found\n"); else
4399 more_errno = yield->more_errno;
4400 printf("Retry rule: %s ", yield->pattern);
4402 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4404 printf("quota%s%s ",
4405 (more_errno > 0)? "_" : "",
4406 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4408 else if (yield->basic_errno == ECONNREFUSED)
4410 printf("refused%s%s ",
4411 (more_errno > 0)? "_" : "",
4412 (more_errno == 'M')? "MX" :
4413 (more_errno == 'A')? "A" : "");
4415 else if (yield->basic_errno == ETIMEDOUT)
4418 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4420 if (more_errno != 0) printf("_%s",
4421 (more_errno == 'M')? "MX" : "A");
4424 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4425 printf("auth_failed ");
4428 for (r = yield->rules; r != NULL; r = r->next)
4430 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4431 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4437 printf(",%d.", x/1000);
4451 exim_exit(EXIT_SUCCESS);
4454 /* Handle a request to list one or more configuration options */
4455 /* If -n was set, we suppress some information */
4459 set_process_info("listing variables");
4460 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4461 else for (i = recipients_arg; i < argc; i++)
4464 (Ustrcmp(argv[i], "router") == 0 ||
4465 Ustrcmp(argv[i], "transport") == 0 ||
4466 Ustrcmp(argv[i], "authenticator") == 0 ||
4467 Ustrcmp(argv[i], "macro") == 0))
4469 readconf_print(argv[i+1], argv[i], flag_n);
4472 else readconf_print(argv[i], NULL, flag_n);
4474 exim_exit(EXIT_SUCCESS);
4478 /* Handle a request to deliver one or more messages that are already on the
4479 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4480 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4482 Delivery of specific messages is typically used for a small number when
4483 prodding by hand (when the option forced_delivery will be set) or when
4484 re-execing to regain root privilege. Each message delivery must happen in a
4485 separate process, so we fork a process for each one, and run them sequentially
4486 so that debugging output doesn't get intertwined, and to avoid spawning too
4487 many processes if a long list is given. However, don't fork for the last one;
4488 this saves a process in the common case when Exim is called to deliver just one
4491 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4493 if (prod_requires_admin && !admin_user)
4495 fprintf(stderr, "exim: Permission denied\n");
4496 exim_exit(EXIT_FAILURE);
4498 set_process_info("delivering specified messages");
4499 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4500 for (i = msg_action_arg; i < argc; i++)
4505 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4506 else if ((pid = fork()) == 0)
4508 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4509 _exit(EXIT_SUCCESS);
4513 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4515 exim_exit(EXIT_FAILURE);
4519 exim_exit(EXIT_SUCCESS);
4523 /* If only a single queue run is requested, without SMTP listening, we can just
4524 turn into a queue runner, with an optional starting message id. */
4526 if (queue_interval == 0 && !daemon_listen)
4528 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4529 (start_queue_run_id == NULL)? US"" : US" starting at ",
4530 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4531 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4532 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4533 set_process_info("running the queue (single queue run)");
4534 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4535 exim_exit(EXIT_SUCCESS);
4539 /* Find the login name of the real user running this process. This is always
4540 needed when receiving a message, because it is written into the spool file. It
4541 may also be used to construct a from: or a sender: header, and in this case we
4542 need the user's full name as well, so save a copy of it, checked for RFC822
4543 syntax and munged if necessary, if it hasn't previously been set by the -F
4544 argument. We may try to get the passwd entry more than once, in case NIS or
4545 other delays are in evidence. Save the home directory for use in filter testing
4550 if ((pw = getpwuid(real_uid)) != NULL)
4552 originator_login = string_copy(US pw->pw_name);
4553 originator_home = string_copy(US pw->pw_dir);
4555 /* If user name has not been set by -F, set it from the passwd entry
4556 unless -f has been used to set the sender address by a trusted user. */
4558 if (originator_name == NULL)
4560 if (sender_address == NULL ||
4561 (!trusted_caller && filter_test == FTEST_NONE))
4563 uschar *name = US pw->pw_gecos;
4564 uschar *amp = Ustrchr(name, '&');
4567 /* Most Unix specify that a '&' character in the gecos field is
4568 replaced by a copy of the login name, and some even specify that
4569 the first character should be upper cased, so that's what we do. */
4574 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4575 amp - name, name, &loffset, originator_login, amp + 1);
4576 buffer[loffset] = toupper(buffer[loffset]);
4580 /* If a pattern for matching the gecos field was supplied, apply
4581 it and then expand the name string. */
4583 if (gecos_pattern != NULL && gecos_name != NULL)
4586 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4588 if (regex_match_and_setup(re, name, 0, -1))
4590 uschar *new_name = expand_string(gecos_name);
4592 if (new_name != NULL)
4594 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4595 "gecos field \"%s\"\n", new_name, name);
4598 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4599 "\"%s\": %s\n", gecos_name, expand_string_message);
4601 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4602 "gecos field \"%s\"\n", gecos_pattern, name);
4603 store_free((void *)re);
4605 originator_name = string_copy(name);
4608 /* A trusted caller has used -f but not -F */
4610 else originator_name = US"";
4613 /* Break the retry loop */
4618 if (++i > finduser_retries) break;
4622 /* If we cannot get a user login, log the incident and give up, unless the
4623 configuration specifies something to use. When running in the test harness,
4624 any setting of unknown_login overrides the actual name. */
4626 if (originator_login == NULL || running_in_test_harness)
4628 if (unknown_login != NULL)
4630 originator_login = expand_string(unknown_login);
4631 if (originator_name == NULL && unknown_username != NULL)
4632 originator_name = expand_string(unknown_username);
4633 if (originator_name == NULL) originator_name = US"";
4635 if (originator_login == NULL)
4636 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4640 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4643 originator_name = string_copy(parse_fix_phrase(originator_name,
4644 Ustrlen(originator_name), big_buffer, big_buffer_size));
4646 /* If a message is created by this call of Exim, the uid/gid of its originator
4647 are those of the caller. These values are overridden if an existing message is
4648 read in from the spool. */
4650 originator_uid = real_uid;
4651 originator_gid = real_gid;
4653 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4654 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4656 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4657 returns. We leave this till here so that the originator_ fields are available
4658 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4661 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4665 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4666 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4667 "mua_wrapper is set");
4672 /* If the sender ident has not been set (by a trusted caller) set it to
4673 the caller. This will get overwritten below for an inetd call. If a trusted
4674 caller has set it empty, unset it. */
4676 if (sender_ident == NULL) sender_ident = originator_login;
4677 else if (sender_ident[0] == 0) sender_ident = NULL;
4679 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4680 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4681 originator_* variables set. */
4683 if (test_rewrite_arg >= 0)
4685 really_exim = FALSE;
4686 if (test_rewrite_arg >= argc)
4688 printf("-brw needs an address argument\n");
4689 exim_exit(EXIT_FAILURE);
4691 rewrite_test(argv[test_rewrite_arg]);
4692 exim_exit(EXIT_SUCCESS);
4695 /* A locally-supplied message is considered to be coming from a local user
4696 unless a trusted caller supplies a sender address with -f, or is passing in the
4697 message via SMTP (inetd invocation or otherwise). */
4699 if ((sender_address == NULL && !smtp_input) ||
4700 (!trusted_caller && filter_test == FTEST_NONE))
4702 sender_local = TRUE;
4704 /* A trusted caller can supply authenticated_sender and authenticated_id
4705 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4706 defaults except when host checking. */
4708 if (authenticated_sender == NULL && !host_checking)
4709 authenticated_sender = string_sprintf("%s@%s", originator_login,
4710 qualify_domain_sender);
4711 if (authenticated_id == NULL && !host_checking)
4712 authenticated_id = originator_login;
4715 /* Trusted callers are always permitted to specify the sender address.
4716 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4717 is specified is the empty address. However, if a trusted caller does not
4718 specify a sender address for SMTP input, we leave sender_address unset. This
4719 causes the MAIL commands to be honoured. */
4721 if ((!smtp_input && sender_address == NULL) ||
4722 !receive_check_set_sender(sender_address))
4724 /* Either the caller is not permitted to set a general sender, or this is
4725 non-SMTP input and the trusted caller has not set a sender. If there is no
4726 sender, or if a sender other than <> is set, override with the originator's
4727 login (which will get qualified below), except when checking things. */
4729 if (sender_address == NULL /* No sender_address set */
4731 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4732 !checking && /* Not running tests, AND */
4733 filter_test == FTEST_NONE)) /* Not testing a filter */
4735 sender_address = originator_login;
4736 sender_address_forced = FALSE;
4737 sender_address_domain = 0;
4741 /* Remember whether an untrusted caller set the sender address */
4743 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4745 /* Ensure that the sender address is fully qualified unless it is the empty
4746 address, which indicates an error message, or doesn't exist (root caller, smtp
4747 interface, no -f argument). */
4749 if (sender_address != NULL && sender_address[0] != 0 &&
4750 sender_address_domain == 0)
4751 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4752 qualify_domain_sender);
4754 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4756 /* Handle a request to verify a list of addresses, or test them for delivery.
4757 This must follow the setting of the sender address, since routers can be
4758 predicated upon the sender. If no arguments are given, read addresses from
4759 stdin. Set debug_level to at least D_v to get full output for address testing.
4762 if (verify_address_mode || address_test_mode)
4765 int flags = vopt_qualify;
4767 if (verify_address_mode)
4769 if (!verify_as_sender) flags |= vopt_is_recipient;
4770 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4775 flags |= vopt_is_recipient;
4776 debug_selector |= D_v;
4777 debug_file = stderr;
4778 debug_fd = fileno(debug_file);
4779 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4782 if (recipients_arg < argc)
4784 while (recipients_arg < argc)
4786 uschar *s = argv[recipients_arg++];
4789 BOOL finished = FALSE;
4790 uschar *ss = parse_find_address_end(s, FALSE);
4791 if (*ss == ',') *ss = 0; else finished = TRUE;
4792 test_address(s, flags, &exit_value);
4795 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4802 uschar *s = get_stdinput(NULL, NULL);
4803 if (s == NULL) break;
4804 test_address(s, flags, &exit_value);
4808 exim_exit(exit_value);
4811 /* Handle expansion checking. Either expand items on the command line, or read
4812 from stdin if there aren't any. If -Mset was specified, load the message so
4813 that its variables can be used, but restrict this facility to admin users.
4814 Otherwise, if -bem was used, read a message from stdin. */
4818 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4820 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4823 fprintf(stderr, "exim: permission denied\n");
4826 message_id = argv[msg_action_arg];
4827 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4828 if (!spool_open_datafile(message_id))
4829 printf ("Failed to load message datafile %s\n", message_id);
4830 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4831 printf ("Failed to load message %s\n", message_id);
4834 /* Read a test message from a file. We fudge it up to be on stdin, saving
4835 stdin itself for later reading of expansion strings. */
4837 else if (expansion_test_message != NULL)
4839 int save_stdin = dup(0);
4840 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4843 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4845 return EXIT_FAILURE;
4848 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4849 message_ended = END_NOTENDED;
4850 read_message_body(receive_msg(extract_recipients));
4851 message_linecount += body_linecount;
4852 (void)dup2(save_stdin, 0);
4853 (void)close(save_stdin);
4854 clearerr(stdin); /* Required by Darwin */
4857 /* Allow $recipients for this testing */
4859 enable_dollar_recipients = TRUE;
4861 /* Expand command line items */
4863 if (recipients_arg < argc)
4865 while (recipients_arg < argc)
4867 uschar *s = argv[recipients_arg++];
4868 uschar *ss = expand_string(s);
4869 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4870 else printf("%s\n", CS ss);
4878 char *(*fn_readline)(const char *) = NULL;
4879 void (*fn_addhist)(const char *) = NULL;
4882 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4888 uschar *source = get_stdinput(fn_readline, fn_addhist);
4889 if (source == NULL) break;
4890 ss = expand_string(source);
4892 printf ("Failed: %s\n", expand_string_message);
4893 else printf("%s\n", CS ss);
4897 if (dlhandle != NULL) dlclose(dlhandle);
4901 /* The data file will be open after -Mset */
4903 if (deliver_datafile >= 0)
4905 (void)close(deliver_datafile);
4906 deliver_datafile = -1;
4909 exim_exit(EXIT_SUCCESS);
4913 /* The active host name is normally the primary host name, but it can be varied
4914 for hosts that want to play several parts at once. We need to ensure that it is
4915 set for host checking, and for receiving messages. */
4917 smtp_active_hostname = primary_hostname;
4918 if (raw_active_hostname != NULL)
4920 uschar *nah = expand_string(raw_active_hostname);
4923 if (!expand_string_forcedfail)
4924 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4925 "(smtp_active_hostname): %s", raw_active_hostname,
4926 expand_string_message);
4928 else if (nah[0] != 0) smtp_active_hostname = nah;
4931 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4932 given IP address so that the blocking and relay configuration can be tested.
4933 Unless a sender_ident was set by -oMt, we discard it (the default is the
4934 caller's login name). An RFC 1413 call is made only if we are running in the
4935 test harness and an incoming interface and both ports are specified, because
4936 there is no TCP/IP call to find the ident for. */
4943 if (!sender_ident_set)
4945 sender_ident = NULL;
4946 if (running_in_test_harness && sender_host_port != 0 &&
4947 interface_address != NULL && interface_port != 0)
4948 verify_get_ident(1413);
4951 /* In case the given address is a non-canonical IPv6 address, canonicize
4952 it. The code works for both IPv4 and IPv6, as it happens. */
4954 size = host_aton(sender_host_address, x);
4955 sender_host_address = store_get(48); /* large enough for full IPv6 */
4956 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4958 /* Now set up for testing */
4960 host_build_sender_fullhost();
4964 sender_local = FALSE;
4965 sender_host_notsocket = TRUE;
4966 debug_file = stderr;
4967 debug_fd = fileno(debug_file);
4968 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4969 "**** but without any ident (RFC 1413) callback.\n"
4970 "**** This is not for real!\n\n",
4971 sender_host_address);
4973 if (verify_check_host(&hosts_connection_nolog) == OK)
4974 log_write_selector &= ~L_smtp_connection;
4975 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4977 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4978 because a log line has already been written for all its failure exists
4979 (usually "connection refused: <reason>") and writing another one is
4980 unnecessary clutter. */
4982 if (smtp_start_session())
4984 reset_point = store_get(0);
4987 store_reset(reset_point);
4988 if (smtp_setup_msg() <= 0) break;
4989 if (!receive_msg(FALSE)) break;
4993 exim_exit(EXIT_SUCCESS);
4997 /* Arrange for message reception if recipients or SMTP were specified;
4998 otherwise complain unless a version print (-bV) happened or this is a filter
4999 verification test or info dump.
5000 In the former case, show the configuration file name. */
5002 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5004 if (version_printed)
5006 printf("Configuration file is %s\n", config_main_filename);
5007 return EXIT_SUCCESS;
5010 if (info_flag != CMDINFO_NONE)
5012 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5013 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5016 if (filter_test == FTEST_NONE)
5017 exim_usage(called_as);
5021 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5022 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5023 that we are not called from inetd, because that is rejected above. The
5024 following configuration settings are forced here:
5026 (1) Synchronous delivery (-odi)
5027 (2) Errors to stderr (-oep == -oeq)
5028 (3) No parallel remote delivery
5029 (4) Unprivileged delivery
5031 We don't force overall queueing options because there are several of them;
5032 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5033 to override any SMTP queueing. */
5037 synchronous_delivery = TRUE;
5038 arg_error_handling = ERRORS_STDERR;
5039 remote_max_parallel = 1;
5040 deliver_drop_privilege = TRUE;
5042 queue_smtp_domains = NULL;
5046 /* Prepare to accept one or more new messages on the standard input. When a
5047 message has been read, its id is returned in message_id[]. If doing immediate
5048 delivery, we fork a delivery process for each received message, except for the
5049 last one, where we can save a process switch.
5051 It is only in non-smtp mode that error_handling is allowed to be changed from
5052 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5053 sendmail error modes other than -oem ever actually used? Later: yes.) */
5055 if (!smtp_input) error_handling = arg_error_handling;
5057 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5058 logging being sent down the socket and make an identd call to get the
5063 (void)fclose(stderr);
5064 exim_nullstd(); /* Re-open to /dev/null */
5065 verify_get_ident(IDENT_PORT);
5066 host_build_sender_fullhost();
5067 set_process_info("handling incoming connection from %s via inetd",
5071 /* If the sender host address has been set, build sender_fullhost if it hasn't
5072 already been done (which it will have been for inetd). This caters for the
5073 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5074 so that the test for IP options is skipped for -bs input. */
5076 if (sender_host_address != NULL && sender_fullhost == NULL)
5078 host_build_sender_fullhost();
5079 set_process_info("handling incoming connection from %s via -oMa",
5081 sender_host_notsocket = TRUE;
5084 /* Otherwise, set the sender host as unknown except for inetd calls. This
5085 prevents host checking in the case of -bs not from inetd and also for -bS. */
5087 else if (!is_inetd) sender_host_unknown = TRUE;
5089 /* If stdout does not exist, then dup stdin to stdout. This can happen
5090 if exim is started from inetd. In this case fd 0 will be set to the socket,
5091 but fd 1 will not be set. This also happens for passed SMTP channels. */
5093 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5095 /* Set up the incoming protocol name and the state of the program. Root is
5096 allowed to force received protocol via the -oMr option above. If we have come
5097 via inetd, the process info has already been set up. We don't set
5098 received_protocol here for smtp input, as it varies according to
5099 batch/HELO/EHLO/AUTH/TLS. */
5103 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5104 smtp_batched_input? "batched " : "",
5105 (sender_address!= NULL)? sender_address : originator_login);
5109 if (received_protocol == NULL)
5110 received_protocol = string_sprintf("local%s", called_as);
5111 set_process_info("accepting a local non-SMTP message from <%s>",
5115 /* Initialize the session_local_queue-only flag (this will be ignored if
5116 mua_wrapper is set) */
5119 session_local_queue_only = queue_only;
5121 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5122 the spool if so configured. On failure, we must not attempt to send an error
5123 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5124 error code is given.) */
5126 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5128 fprintf(stderr, "exim: insufficient disk space\n");
5129 return EXIT_FAILURE;
5132 /* If this is smtp input of any kind, real or batched, handle the start of the
5135 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5136 because a log line has already been written for all its failure exists
5137 (usually "connection refused: <reason>") and writing another one is
5138 unnecessary clutter. */
5144 if (verify_check_host(&hosts_connection_nolog) == OK)
5145 log_write_selector &= ~L_smtp_connection;
5146 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5147 if (!smtp_start_session())
5150 exim_exit(EXIT_SUCCESS);
5154 /* Otherwise, set up the input size limit here. */
5158 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5159 if (expand_string_message != NULL)
5161 if (thismessage_size_limit == -1)
5162 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5163 "message_size_limit: %s", expand_string_message);
5165 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5166 "message_size_limit: %s", expand_string_message);
5170 /* Loop for several messages when reading SMTP input. If we fork any child
5171 processes, we don't want to wait for them unless synchronous delivery is
5172 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5173 same as SIG_DFL, despite the fact that documentation often lists the default as
5174 "ignore". This is a confusing area. This is what I know:
5176 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5177 processes that complete simply to go away without ever becoming defunct. You
5178 can't then wait for them - but we don't want to wait for them in the
5179 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5180 happen for all OS (e.g. *BSD is different).
5182 But that's not the end of the story. Some (many? all?) systems have the
5183 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5184 has by default, so it seems that the difference is merely one of default
5185 (compare restarting vs non-restarting signals).
5187 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5188 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5189 of the loop below. Paranoia rules.
5191 February 2003: That's *still* not the end of the story. There are now versions
5192 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5193 process then calls waitpid(), a grumble is written to the system log, because
5194 this is logically inconsistent. In other words, it doesn't like the paranoia.
5195 As a consequenc of this, the waitpid() below is now excluded if we are sure
5196 that SIG_IGN works. */
5198 if (!synchronous_delivery)
5201 struct sigaction act;
5202 act.sa_handler = SIG_IGN;
5203 sigemptyset(&(act.sa_mask));
5204 act.sa_flags = SA_NOCLDWAIT;
5205 sigaction(SIGCHLD, &act, NULL);
5207 signal(SIGCHLD, SIG_IGN);
5211 /* Save the current store pool point, for resetting at the start of
5212 each message, and save the real sender address, if any. */
5214 reset_point = store_get(0);
5215 real_sender_address = sender_address;
5217 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5218 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5223 store_reset(reset_point);
5226 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5227 input and build the recipients list, before calling receive_msg() to read the
5228 message proper. Whatever sender address is given in the SMTP transaction is
5229 often ignored for local senders - we use the actual sender, which is normally
5230 either the underlying user running this process or a -f argument provided by
5231 a trusted caller. It is saved in real_sender_address. The test for whether to
5232 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5237 if ((rc = smtp_setup_msg()) > 0)
5239 if (real_sender_address != NULL &&
5240 !receive_check_set_sender(sender_address))
5242 sender_address = raw_sender = real_sender_address;
5243 sender_address_unrewritten = NULL;
5246 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5247 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5248 the very end. The result of the ACL is ignored (as for other non-SMTP
5249 messages). It is run for its potential side effects. */
5251 if (smtp_batched_input && acl_not_smtp_start != NULL)
5253 uschar *user_msg, *log_msg;
5254 enable_dollar_recipients = TRUE;
5255 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5256 &user_msg, &log_msg);
5257 enable_dollar_recipients = FALSE;
5260 /* Now get the data for the message */
5262 more = receive_msg(extract_recipients);
5263 if (message_id[0] == 0)
5266 smtp_log_no_mail(); /* Log no mail if configured */
5267 exim_exit(EXIT_FAILURE);
5272 smtp_log_no_mail(); /* Log no mail if configured */
5273 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5277 /* In the non-SMTP case, we have all the information from the command
5278 line, but must process it in case it is in the more general RFC822
5279 format, and in any case, to detect syntax errors. Also, it appears that
5280 the use of comma-separated lists as single arguments is common, so we
5281 had better support them. */
5287 int count = argc - recipients_arg;
5288 uschar **list = argv + recipients_arg;
5290 /* These options cannot be changed dynamically for non-SMTP messages */
5292 active_local_sender_retain = local_sender_retain;
5293 active_local_from_check = local_from_check;
5295 /* Save before any rewriting */
5297 raw_sender = string_copy(sender_address);
5299 /* Loop for each argument */
5301 for (i = 0; i < count; i++)
5303 int start, end, domain;
5305 uschar *s = list[i];
5307 /* Loop for each comma-separated address */
5311 BOOL finished = FALSE;
5313 uschar *ss = parse_find_address_end(s, FALSE);
5315 if (*ss == ',') *ss = 0; else finished = TRUE;
5317 /* Check max recipients - if -t was used, these aren't recipients */
5319 if (recipients_max > 0 && ++rcount > recipients_max &&
5320 !extract_recipients)
5322 if (error_handling == ERRORS_STDERR)
5324 fprintf(stderr, "exim: too many recipients\n");
5325 exim_exit(EXIT_FAILURE);
5330 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5331 errors_sender_rc : EXIT_FAILURE;
5336 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5338 if (domain == 0 && !allow_unqualified_recipient)
5341 errmess = US"unqualified recipient address not allowed";
5344 if (recipient == NULL)
5346 if (error_handling == ERRORS_STDERR)
5348 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5349 string_printing(list[i]), errmess);
5350 exim_exit(EXIT_FAILURE);
5356 eblock.text1 = string_printing(list[i]);
5357 eblock.text2 = errmess;
5359 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5360 errors_sender_rc : EXIT_FAILURE;
5364 receive_add_recipient(recipient, -1);
5367 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5371 /* Show the recipients when debugging */
5376 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5377 if (recipients_list != NULL)
5379 debug_printf("Recipients:\n");
5380 for (i = 0; i < recipients_count; i++)
5381 debug_printf(" %s\n", recipients_list[i].address);
5385 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5386 ignored; rejecting here would just add complication, and it can just as
5387 well be done later. Allow $recipients to be visible in the ACL. */
5389 if (acl_not_smtp_start != NULL)
5391 uschar *user_msg, *log_msg;
5392 enable_dollar_recipients = TRUE;
5393 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5394 &user_msg, &log_msg);
5395 enable_dollar_recipients = FALSE;
5398 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5399 will just read the headers for the message, and not write anything onto the
5402 message_ended = END_NOTENDED;
5403 more = receive_msg(extract_recipients);
5405 /* more is always FALSE here (not SMTP message) when reading a message
5406 for real; when reading the headers of a message for filter testing,
5407 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5409 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5410 } /* Non-SMTP message reception */
5412 /* If this is a filter testing run, there are headers in store, but
5413 no message on the spool. Run the filtering code in testing mode, setting
5414 the domain to the qualify domain and the local part to the current user,
5415 unless they have been set by options. The prefix and suffix are left unset
5416 unless specified. The the return path is set to to the sender unless it has
5417 already been set from a return-path header in the message. */
5419 if (filter_test != FTEST_NONE)
5421 deliver_domain = (ftest_domain != NULL)?
5422 ftest_domain : qualify_domain_recipient;
5423 deliver_domain_orig = deliver_domain;
5424 deliver_localpart = (ftest_localpart != NULL)?
5425 ftest_localpart : originator_login;
5426 deliver_localpart_orig = deliver_localpart;
5427 deliver_localpart_prefix = ftest_prefix;
5428 deliver_localpart_suffix = ftest_suffix;
5429 deliver_home = originator_home;
5431 if (return_path == NULL)
5433 printf("Return-path copied from sender\n");
5434 return_path = string_copy(sender_address);
5438 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5440 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5442 receive_add_recipient(
5443 string_sprintf("%s%s%s@%s",
5444 (ftest_prefix == NULL)? US"" : ftest_prefix,
5446 (ftest_suffix == NULL)? US"" : ftest_suffix,
5447 deliver_domain), -1);
5449 printf("Recipient = %s\n", recipients_list[0].address);
5450 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5451 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5453 if (chdir("/")) /* Get away from wherever the user is running this from */
5455 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5456 exim_exit(EXIT_FAILURE);
5459 /* Now we run either a system filter test, or a user filter test, or both.
5460 In the latter case, headers added by the system filter will persist and be
5461 available to the user filter. We need to copy the filter variables
5464 if ((filter_test & FTEST_SYSTEM) != 0)
5466 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5467 exim_exit(EXIT_FAILURE);
5470 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5472 if ((filter_test & FTEST_USER) != 0)
5474 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5475 exim_exit(EXIT_FAILURE);
5478 exim_exit(EXIT_SUCCESS);
5481 /* Else act on the result of message reception. We should not get here unless
5482 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5483 will be TRUE. If it is not, check on the number of messages received in this
5486 if (!session_local_queue_only &&
5487 smtp_accept_queue_per_connection > 0 &&
5488 receive_messagecount > smtp_accept_queue_per_connection)
5490 session_local_queue_only = TRUE;
5491 queue_only_reason = 2;
5494 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5495 and queue_only_load is set, check that the load average is below it. If it is
5496 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5497 default), we put the whole session into queue_only mode. It then remains this
5498 way for any subsequent messages on the same SMTP connection. This is a
5499 deliberate choice; even though the load average may fall, it doesn't seem
5500 right to deliver later messages on the same call when not delivering earlier
5501 ones. However, there are odd cases where this is not wanted, so this can be
5502 changed by setting queue_only_load_latch false. */
5504 local_queue_only = session_local_queue_only;
5505 if (!local_queue_only && queue_only_load >= 0)
5507 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5508 if (local_queue_only)
5510 queue_only_reason = 3;
5511 if (queue_only_load_latch) session_local_queue_only = TRUE;
5515 /* If running as an MUA wrapper, all queueing options and freezing options
5519 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5521 /* Log the queueing here, when it will get a message id attached, but
5522 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5525 if (local_queue_only) switch(queue_only_reason)
5528 log_write(L_delay_delivery,
5529 LOG_MAIN, "no immediate delivery: more than %d messages "
5530 "received in one connection", smtp_accept_queue_per_connection);
5534 log_write(L_delay_delivery,
5535 LOG_MAIN, "no immediate delivery: load average %.2f",
5536 (double)load_average/1000.0);
5540 /* Else do the delivery unless the ACL or local_scan() called for queue only
5541 or froze the message. Always deliver in a separate process. A fork failure is
5542 not a disaster, as the delivery will eventually happen on a subsequent queue
5543 run. The search cache must be tidied before the fork, as the parent will
5544 do it before exiting. The child will trigger a lookup failure and
5545 thereby defer the delivery if it tries to use (for example) a cached ldap
5546 connection that the parent has called unbind on. */
5548 else if (!queue_only_policy && !deliver_freeze)
5553 if ((pid = fork()) == 0)
5556 close_unwanted(); /* Close unwanted file descriptors and TLS */
5557 exim_nullstd(); /* Ensure std{in,out,err} exist */
5559 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5560 mode, deliver_drop_privilege is forced TRUE). */
5562 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5564 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5566 /* Control does not return here. */
5569 /* No need to re-exec */
5571 rc = deliver_message(message_id, FALSE, FALSE);
5573 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5574 EXIT_SUCCESS : EXIT_FAILURE);
5579 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5580 "process: %s", strerror(errno));
5583 /* In the parent, wait if synchronous delivery is required. This will
5584 always be the case in MUA wrapper mode. */
5586 else if (synchronous_delivery)
5589 while (wait(&status) != pid);
5590 if ((status & 0x00ff) != 0)
5591 log_write(0, LOG_MAIN|LOG_PANIC,
5592 "process %d crashed with signal %d while delivering %s",
5593 (int)pid, status & 0x00ff, message_id);
5594 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5598 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5599 automatically reaps children (see comments above the loop), clear away any
5600 finished subprocesses here, in case there are lots of messages coming in
5601 from the same source. */
5603 #ifndef SIG_IGN_WORKS
5604 while (waitpid(-1, NULL, WNOHANG) > 0);
5608 exim_exit(EXIT_SUCCESS); /* Never returns */
5609 return 0; /* To stop compiler warning */