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");
842 fprintf(f, "Lookups (built-in):");
843 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
844 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
846 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
849 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
850 fprintf(f, " dbm dbmjz dbmnz");
852 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
853 fprintf(f, " dnsdb");
855 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
856 fprintf(f, " dsearch");
858 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
859 fprintf(f, " ibase");
861 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
862 fprintf(f, " ldap ldapdn ldapm");
864 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
865 fprintf(f, " mysql");
867 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
868 fprintf(f, " nis nis0");
870 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
871 fprintf(f, " nisplus");
873 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
874 fprintf(f, " oracle");
876 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
877 fprintf(f, " passwd");
879 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
880 fprintf(f, " pgsql");
882 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
883 fprintf(f, " sqlite");
885 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
886 fprintf(f, " testdb");
888 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
889 fprintf(f, " whoson");
893 fprintf(f, "Authenticators:");
895 fprintf(f, " cram_md5");
897 #ifdef AUTH_CYRUS_SASL
898 fprintf(f, " cyrus_sasl");
901 fprintf(f, " dovecot");
904 fprintf(f, " gsasl");
906 #ifdef AUTH_HEIMDAL_GSSAPI
907 fprintf(f, " heimdal_gssapi");
909 #ifdef AUTH_PLAINTEXT
910 fprintf(f, " plaintext");
917 fprintf(f, "Routers:");
919 fprintf(f, " accept");
921 #ifdef ROUTER_DNSLOOKUP
922 fprintf(f, " dnslookup");
924 #ifdef ROUTER_IPLITERAL
925 fprintf(f, " ipliteral");
927 #ifdef ROUTER_IPLOOKUP
928 fprintf(f, " iplookup");
930 #ifdef ROUTER_MANUALROUTE
931 fprintf(f, " manualroute");
933 #ifdef ROUTER_QUERYPROGRAM
934 fprintf(f, " queryprogram");
936 #ifdef ROUTER_REDIRECT
937 fprintf(f, " redirect");
941 fprintf(f, "Transports:");
942 #ifdef TRANSPORT_APPENDFILE
943 fprintf(f, " appendfile");
944 #ifdef SUPPORT_MAILDIR
945 fprintf(f, "/maildir");
947 #ifdef SUPPORT_MAILSTORE
948 fprintf(f, "/mailstore");
954 #ifdef TRANSPORT_AUTOREPLY
955 fprintf(f, " autoreply");
957 #ifdef TRANSPORT_LMTP
960 #ifdef TRANSPORT_PIPE
963 #ifdef TRANSPORT_SMTP
968 if (fixed_never_users[0] > 0)
971 fprintf(f, "Fixed never_users: ");
972 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
973 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
974 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
977 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
979 /* Everything else is details which are only worth reporting when debugging.
980 Perhaps the tls_version_report should move into this too. */
985 /* clang defines __GNUC__ (at least, for me) so test for it first */
986 #if defined(__clang__)
987 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
988 #elif defined(__GNUC__)
989 fprintf(f, "Compiler: GCC [%s]\n",
993 "? unknown version ?"
997 fprintf(f, "Compiler: <unknown>\n");
1001 tls_version_report(f);
1004 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1005 if (authi->version_report) {
1006 (*authi->version_report)(f);
1010 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1011 characters; unless it's an ancient version of PCRE in which case it
1013 #ifndef PCRE_PRERELEASE
1014 #define PCRE_PRERELEASE
1017 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1018 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1020 PCRE_MAJOR, PCRE_MINOR,
1021 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1024 #undef EXPAND_AND_QUOTE
1027 for (i = 0; i < lookup_list_count; i++)
1029 if (lookup_list[i]->version_report)
1030 lookup_list[i]->version_report(f);
1033 #ifdef WHITELIST_D_MACROS
1034 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1036 fprintf(f, "WHITELIST_D_MACROS unset\n");
1038 #ifdef TRUSTED_CONFIG_LIST
1039 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1041 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1048 /*************************************************
1049 * Show auxiliary information about Exim *
1050 *************************************************/
1053 show_exim_information(enum commandline_info request, FILE *stream)
1060 fprintf(stream, "Oops, something went wrong.\n");
1064 "The -bI: flag takes a string indicating which information to provide.\n"
1065 "If the string is not recognised, you'll get this help (on stderr).\n"
1067 " exim -bI:help this information\n"
1068 " exim -bI:dscp dscp value keywords known\n"
1069 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1073 for (pp = exim_sieve_extension_list; *pp; ++pp)
1074 fprintf(stream, "%s\n", *pp);
1077 dscp_list_to_stream(stream);
1083 /*************************************************
1084 * Quote a local part *
1085 *************************************************/
1087 /* This function is used when a sender address or a From: or Sender: header
1088 line is being created from the caller's login, or from an authenticated_id. It
1089 applies appropriate quoting rules for a local part.
1091 Argument: the local part
1092 Returns: the local part, quoted if necessary
1096 local_part_quote(uschar *lpart)
1098 BOOL needs_quote = FALSE;
1103 for (t = lpart; !needs_quote && *t != 0; t++)
1105 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1106 (*t != '.' || t == lpart || t[1] == 0);
1109 if (!needs_quote) return lpart;
1112 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1116 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1119 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1122 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1123 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1124 yield = string_cat(yield, &size, &ptr, nq, 1);
1128 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1136 /*************************************************
1137 * Load readline() functions *
1138 *************************************************/
1140 /* This function is called from testing executions that read data from stdin,
1141 but only when running as the calling user. Currently, only -be does this. The
1142 function loads the readline() function library and passes back the functions.
1143 On some systems, it needs the curses library, so load that too, but try without
1144 it if loading fails. All this functionality has to be requested at build time.
1147 fn_readline_ptr pointer to where to put the readline pointer
1148 fn_addhist_ptr pointer to where to put the addhistory function
1150 Returns: the dlopen handle or NULL on failure
1154 set_readline(char * (**fn_readline_ptr)(const char *),
1155 void (**fn_addhist_ptr)(const char *))
1158 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1160 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1161 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1163 if (dlhandle != NULL)
1165 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1166 * char * readline (const char *prompt);
1167 * void add_history (const char *string);
1169 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1170 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1174 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1183 /*************************************************
1184 * Get a line from stdin for testing things *
1185 *************************************************/
1187 /* This function is called when running tests that can take a number of lines
1188 of input (for example, -be and -bt). It handles continuations and trailing
1189 spaces. And prompting and a blank line output on eof. If readline() is in use,
1190 the arguments are non-NULL and provide the relevant functions.
1193 fn_readline readline function or NULL
1194 fn_addhist addhist function or NULL
1196 Returns: pointer to dynamic memory, or NULL at end of file
1200 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1205 uschar *yield = NULL;
1207 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1211 uschar buffer[1024];
1215 char *readline_line = NULL;
1216 if (fn_readline != NULL)
1218 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1219 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1220 p = US readline_line;
1225 /* readline() not in use */
1228 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1232 /* Handle the line */
1234 ss = p + (int)Ustrlen(p);
1235 while (ss > p && isspace(ss[-1])) ss--;
1239 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1242 yield = string_cat(yield, &size, &ptr, p, ss - p);
1245 if (fn_readline != NULL) free(readline_line);
1248 if (ss == p || yield[ptr-1] != '\\')
1256 if (yield == NULL) printf("\n");
1262 /*************************************************
1263 * Output usage information for the program *
1264 *************************************************/
1266 /* This function is called when there are no recipients
1267 or a specific --help argument was added.
1270 progname information on what name we were called by
1272 Returns: DOES NOT RETURN
1276 exim_usage(uschar *progname)
1279 /* Handle specific program invocation varients */
1280 if (Ustrcmp(progname, US"-mailq") == 0)
1283 "mailq - list the contents of the mail queue\n\n"
1284 "For a list of options, see the Exim documentation.\n");
1288 /* Generic usage - we output this whatever happens */
1290 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1291 "not directly from a shell command line. Options and/or arguments control\n"
1292 "what it does when called. For a list of options, see the Exim documentation.\n");
1299 /*************************************************
1300 * Validate that the macros given are okay *
1301 *************************************************/
1303 /* Typically, Exim will drop privileges if macros are supplied. In some
1304 cases, we want to not do so.
1306 Arguments: none (macros is a global)
1307 Returns: true if trusted, false otherwise
1311 macros_trusted(void)
1313 #ifdef WHITELIST_D_MACROS
1315 uschar *whitelisted, *end, *p, **whites, **w;
1316 int white_count, i, n;
1318 BOOL prev_char_item, found;
1323 #ifndef WHITELIST_D_MACROS
1327 /* We only trust -D overrides for some invoking users:
1328 root, the exim run-time user, the optional config owner user.
1329 I don't know why config-owner would be needed, but since they can own the
1330 config files anyway, there's no security risk to letting them override -D. */
1331 if ( ! ((real_uid == root_uid)
1332 || (real_uid == exim_uid)
1333 #ifdef CONFIGURE_OWNER
1334 || (real_uid == config_uid)
1338 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1342 /* Get a list of macros which are whitelisted */
1343 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1344 prev_char_item = FALSE;
1346 for (p = whitelisted; *p != '\0'; ++p)
1348 if (*p == ':' || isspace(*p))
1353 prev_char_item = FALSE;
1356 if (!prev_char_item)
1357 prev_char_item = TRUE;
1364 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1365 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1370 if (i == white_count)
1372 while (*p != '\0' && p < end)
1378 /* The list of macros should be very short. Accept the N*M complexity. */
1379 for (m = macros; m != NULL; m = m->next)
1382 for (w = whites; *w; ++w)
1383 if (Ustrcmp(*w, m->name) == 0)
1390 if (m->replacement == NULL)
1392 len = Ustrlen(m->replacement);
1395 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1396 0, PCRE_EOPT, NULL, 0);
1399 if (n != PCRE_ERROR_NOMATCH)
1400 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1404 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1410 /*************************************************
1411 * Entry point and high-level code *
1412 *************************************************/
1414 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1415 the appropriate action. All the necessary functions are present in the one
1416 binary. I originally thought one should split it up, but it turns out that so
1417 much of the apparatus is needed in each chunk that one might as well just have
1418 it all available all the time, which then makes the coding easier as well.
1421 argc count of entries in argv
1422 argv argument strings, with argv[0] being the program name
1424 Returns: EXIT_SUCCESS if terminated successfully
1425 EXIT_FAILURE otherwise, except when a message has been sent
1426 to the sender, and -oee was given
1430 main(int argc, char **cargv)
1432 uschar **argv = USS cargv;
1433 int arg_receive_timeout = -1;
1434 int arg_smtp_receive_timeout = -1;
1435 int arg_error_handling = error_handling;
1436 int filter_sfd = -1;
1437 int filter_ufd = -1;
1440 int list_queue_option = 0;
1442 int msg_action_arg = -1;
1443 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1444 int queue_only_reason = 0;
1446 int perl_start_option = 0;
1448 int recipients_arg = argc;
1449 int sender_address_domain = 0;
1450 int test_retry_arg = -1;
1451 int test_rewrite_arg = -1;
1452 BOOL arg_queue_only = FALSE;
1453 BOOL bi_option = FALSE;
1454 BOOL checking = FALSE;
1455 BOOL count_queue = FALSE;
1456 BOOL expansion_test = FALSE;
1457 BOOL extract_recipients = FALSE;
1458 BOOL flag_G = FALSE;
1459 BOOL flag_n = FALSE;
1460 BOOL forced_delivery = FALSE;
1461 BOOL f_end_dot = FALSE;
1462 BOOL deliver_give_up = FALSE;
1463 BOOL list_queue = FALSE;
1464 BOOL list_options = FALSE;
1465 BOOL local_queue_only;
1467 BOOL one_msg_action = FALSE;
1468 BOOL queue_only_set = FALSE;
1469 BOOL receiving_message = TRUE;
1470 BOOL sender_ident_set = FALSE;
1471 BOOL session_local_queue_only;
1473 BOOL removed_privilege = FALSE;
1474 BOOL usage_wanted = FALSE;
1475 BOOL verify_address_mode = FALSE;
1476 BOOL verify_as_sender = FALSE;
1477 BOOL version_printed = FALSE;
1478 uschar *alias_arg = NULL;
1479 uschar *called_as = US"";
1480 uschar *cmdline_syslog_name = NULL;
1481 uschar *start_queue_run_id = NULL;
1482 uschar *stop_queue_run_id = NULL;
1483 uschar *expansion_test_message = NULL;
1484 uschar *ftest_domain = NULL;
1485 uschar *ftest_localpart = NULL;
1486 uschar *ftest_prefix = NULL;
1487 uschar *ftest_suffix = NULL;
1488 uschar *malware_test_file = NULL;
1489 uschar *real_sender_address;
1490 uschar *originator_home = US"/";
1495 struct stat statbuf;
1496 pid_t passed_qr_pid = (pid_t)0;
1497 int passed_qr_pipe = -1;
1498 gid_t group_list[NGROUPS_MAX];
1500 /* For the -bI: flag */
1501 enum commandline_info info_flag = CMDINFO_NONE;
1502 BOOL info_stdout = FALSE;
1504 /* Possible options for -R and -S */
1506 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1508 /* Need to define this in case we need to change the environment in order
1509 to get rid of a bogus time zone. We have to make it char rather than uschar
1510 because some OS define it in /usr/include/unistd.h. */
1512 extern char **environ;
1514 /* If the Exim user and/or group and/or the configuration file owner/group were
1515 defined by ref:name at build time, we must now find the actual uid/gid values.
1516 This is a feature to make the lives of binary distributors easier. */
1518 #ifdef EXIM_USERNAME
1519 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1523 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1527 /* If ref:name uses a number as the name, route_finduser() returns
1528 TRUE with exim_uid set and pw coerced to NULL. */
1530 exim_gid = pw->pw_gid;
1531 #ifndef EXIM_GROUPNAME
1535 "exim: ref:name should specify a usercode, not a group.\n"
1536 "exim: can't let you get away with it unless you also specify a group.\n");
1543 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1549 #ifdef EXIM_GROUPNAME
1550 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1552 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1558 #ifdef CONFIGURE_OWNERNAME
1559 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1561 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1562 CONFIGURE_OWNERNAME);
1567 /* We default the system_filter_user to be the Exim run-time user, as a
1568 sane non-root value. */
1569 system_filter_uid = exim_uid;
1571 #ifdef CONFIGURE_GROUPNAME
1572 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1574 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1575 CONFIGURE_GROUPNAME);
1580 /* In the Cygwin environment, some initialization needs doing. It is fudged
1581 in by means of this macro. */
1587 /* Check a field which is patched when we are running Exim within its
1588 testing harness; do a fast initial check, and then the whole thing. */
1590 running_in_test_harness =
1591 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1593 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1594 at the start of a program; however, it seems that some environments do not
1595 follow this. A "strange" locale can affect the formatting of timestamps, so we
1598 setlocale(LC_ALL, "C");
1600 /* Set up the default handler for timing using alarm(). */
1602 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1604 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1605 because store_malloc writes a log entry on failure. */
1607 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1608 if (log_buffer == NULL)
1610 fprintf(stderr, "exim: failed to get store for log buffer\n");
1614 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1615 NULL when the daemon is run and the file is closed. We have to use this
1616 indirection, because some systems don't allow writing to the variable "stderr".
1619 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1621 /* Arrange for the PCRE regex library to use our store functions. Note that
1622 the normal calls are actually macros that add additional arguments for
1623 debugging purposes so we have to assign specially constructed functions here.
1624 The default is to use store in the stacking pool, but this is overridden in the
1625 regex_must_compile() function. */
1627 pcre_malloc = function_store_get;
1628 pcre_free = function_dummy_free;
1630 /* Ensure there is a big buffer for temporary use in several places. It is put
1631 in malloc store so that it can be freed for enlargement if necessary. */
1633 big_buffer = store_malloc(big_buffer_size);
1635 /* Set up the handler for the data request signal, and set the initial
1636 descriptive text. */
1638 set_process_info("initializing");
1639 os_restarting_signal(SIGUSR1, usr1_handler);
1641 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1642 in the daemon code. For the rest of Exim's uses, we ignore it. */
1644 signal(SIGHUP, SIG_IGN);
1646 /* We don't want to die on pipe errors as the code is written to handle
1647 the write error instead. */
1649 signal(SIGPIPE, SIG_IGN);
1651 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1652 set to SIG_IGN. This causes subprocesses that complete before the parent
1653 process waits for them not to hang around, so when Exim calls wait(), nothing
1654 is there. The wait() code has been made robust against this, but let's ensure
1655 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1656 ending status. We use sigaction rather than plain signal() on those OS where
1657 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1658 problem on AIX with this.) */
1662 struct sigaction act;
1663 act.sa_handler = SIG_DFL;
1664 sigemptyset(&(act.sa_mask));
1666 sigaction(SIGCHLD, &act, NULL);
1669 signal(SIGCHLD, SIG_DFL);
1672 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1677 /* Set up the version number. Set up the leading 'E' for the external form of
1678 message ids, set the pointer to the internal form, and initialize it to
1679 indicate no message being processed. */
1682 message_id_option[0] = '-';
1683 message_id_external = message_id_option + 1;
1684 message_id_external[0] = 'E';
1685 message_id = message_id_external + 1;
1688 /* Set the umask to zero so that any files Exim creates using open() are
1689 created with the modes that it specifies. NOTE: Files created with fopen() have
1690 a problem, which was not recognized till rather late (February 2006). With this
1691 umask, such files will be world writeable. (They are all content scanning files
1692 in the spool directory, which isn't world-accessible, so this is not a
1693 disaster, but it's untidy.) I don't want to change this overall setting,
1694 however, because it will interact badly with the open() calls. Instead, there's
1695 now a function called modefopen() that fiddles with the umask while calling
1700 /* Precompile the regular expression for matching a message id. Keep this in
1701 step with the code that generates ids in the accept.c module. We need to do
1702 this here, because the -M options check their arguments for syntactic validity
1703 using mac_ismsgid, which uses this. */
1706 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1708 /* Precompile the regular expression that is used for matching an SMTP error
1709 code, possibly extended, at the start of an error message. Note that the
1710 terminating whitespace character is included. */
1713 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1716 #ifdef WHITELIST_D_MACROS
1717 /* Precompile the regular expression used to filter the content of macros
1718 given to -D for permissibility. */
1720 regex_whitelisted_macro =
1721 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1725 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1726 this seems to be a generally accepted convention, since one finds symbolic
1727 links called "mailq" in standard OS configurations. */
1729 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1730 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1733 receiving_message = FALSE;
1734 called_as = US"-mailq";
1737 /* If the program is called as "rmail" treat it as equivalent to
1738 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1739 i.e. preventing a single dot on a line from terminating the message, and
1740 returning with zero return code, even in cases of error (provided an error
1741 message has been sent). */
1743 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1744 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1747 called_as = US"-rmail";
1748 errors_sender_rc = EXIT_SUCCESS;
1751 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1752 this is a smail convention. */
1754 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1755 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1757 smtp_input = smtp_batched_input = TRUE;
1758 called_as = US"-rsmtp";
1761 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1762 this is a smail convention. */
1764 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1765 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1768 receiving_message = FALSE;
1769 called_as = US"-runq";
1772 /* If the program is called as "newaliases" treat it as equivalent to
1773 "exim -bi"; this is a sendmail convention. */
1775 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1776 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1779 receiving_message = FALSE;
1780 called_as = US"-newaliases";
1783 /* Save the original effective uid for a couple of uses later. It should
1784 normally be root, but in some esoteric environments it may not be. */
1786 original_euid = geteuid();
1788 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1789 to be the same as the real ones. This makes a difference only if Exim is setuid
1790 (or setgid) to something other than root, which could be the case in some
1791 special configurations. */
1793 real_uid = getuid();
1794 real_gid = getgid();
1796 if (real_uid == root_uid)
1798 rv = setgid(real_gid);
1801 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1802 (long int)real_gid, strerror(errno));
1805 rv = setuid(real_uid);
1808 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1809 (long int)real_uid, strerror(errno));
1814 /* If neither the original real uid nor the original euid was root, Exim is
1815 running in an unprivileged state. */
1817 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1819 /* Scan the program's arguments. Some can be dealt with right away; others are
1820 simply recorded for checking and handling afterwards. Do a high-level switch
1821 on the second character (the one after '-'), to save some effort. */
1823 for (i = 1; i < argc; i++)
1825 BOOL badarg = FALSE;
1826 uschar *arg = argv[i];
1830 /* An argument not starting with '-' is the start of a recipients list;
1831 break out of the options-scanning loop. */
1839 /* An option consistion of -- terminates the options */
1841 if (Ustrcmp(arg, "--") == 0)
1843 recipients_arg = i + 1;
1847 /* Handle flagged options */
1849 switchchar = arg[1];
1852 /* Make all -ex options synonymous with -oex arguments, since that
1853 is assumed by various callers. Also make -qR options synonymous with -R
1854 options, as that seems to be required as well. Allow for -qqR too, and
1855 the same for -S options. */
1857 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1858 Ustrncmp(arg+1, "qR", 2) == 0 ||
1859 Ustrncmp(arg+1, "qS", 2) == 0)
1861 switchchar = arg[2];
1864 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1866 switchchar = arg[3];
1868 queue_2stage = TRUE;
1871 /* Make -r synonymous with -f, since it is a documented alias */
1873 else if (arg[1] == 'r') switchchar = 'f';
1875 /* Make -ov synonymous with -v */
1877 else if (Ustrcmp(arg, "-ov") == 0)
1883 /* deal with --option_aliases */
1884 else if (switchchar == '-')
1886 if (Ustrcmp(argrest, "help") == 0)
1888 usage_wanted = TRUE;
1891 else if (Ustrcmp(argrest, "version") == 0)
1898 /* High-level switch on active initial letter */
1903 /* sendmail uses -Ac and -Am to control which .cf file is used;
1906 if (*argrest == '\0') { badarg = TRUE; break; }
1909 BOOL ignore = FALSE;
1914 if (*(argrest + 1) == '\0')
1918 if (!ignore) { badarg = TRUE; break; }
1922 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1923 so has no need of it. */
1926 if (*argrest == 0) i++; /* Skip over the type */
1931 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1933 /* -bd: Run in daemon mode, awaiting SMTP connections.
1934 -bdf: Ditto, but in the foreground.
1937 if (*argrest == 'd')
1939 daemon_listen = TRUE;
1940 if (*(++argrest) == 'f') background_daemon = FALSE;
1941 else if (*argrest != 0) { badarg = TRUE; break; }
1944 /* -be: Run in expansion test mode
1945 -bem: Ditto, but read a message from a file first
1948 else if (*argrest == 'e')
1950 expansion_test = checking = TRUE;
1951 if (argrest[1] == 'm')
1953 if (++i >= argc) { badarg = TRUE; break; }
1954 expansion_test_message = argv[i];
1957 if (argrest[1] != 0) { badarg = TRUE; break; }
1960 /* -bF: Run system filter test */
1962 else if (*argrest == 'F')
1964 filter_test |= FTEST_SYSTEM;
1965 if (*(++argrest) != 0) { badarg = TRUE; break; }
1966 if (++i < argc) filter_test_sfile = argv[i]; else
1968 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1973 /* -bf: Run user filter test
1974 -bfd: Set domain for filter testing
1975 -bfl: Set local part for filter testing
1976 -bfp: Set prefix for filter testing
1977 -bfs: Set suffix for filter testing
1980 else if (*argrest == 'f')
1982 if (*(++argrest) == 0)
1984 filter_test |= FTEST_USER;
1985 if (++i < argc) filter_test_ufile = argv[i]; else
1987 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1995 fprintf(stderr, "exim: string expected after %s\n", arg);
1998 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1999 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2000 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2001 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2002 else { badarg = TRUE; break; }
2006 /* -bh: Host checking - an IP address must follow. */
2008 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2010 if (++i >= argc) { badarg = TRUE; break; }
2011 sender_host_address = argv[i];
2012 host_checking = checking = log_testing_mode = TRUE;
2013 host_checking_callout = argrest[1] == 'c';
2016 /* -bi: This option is used by sendmail to initialize *the* alias file,
2017 though it has the -oA option to specify a different file. Exim has no
2018 concept of *the* alias file, but since Sun's YP make script calls
2019 sendmail this way, some support must be provided. */
2021 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2023 /* -bI: provide information, of the type to follow after a colon.
2024 This is an Exim flag. */
2026 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2028 uschar *p = &argrest[2];
2029 info_flag = CMDINFO_HELP;
2032 if (strcmpic(p, CUS"sieve") == 0)
2034 info_flag = CMDINFO_SIEVE;
2037 else if (strcmpic(p, CUS"dscp") == 0)
2039 info_flag = CMDINFO_DSCP;
2042 else if (strcmpic(p, CUS"help") == 0)
2049 /* -bm: Accept and deliver message - the default option. Reinstate
2050 receiving_message, which got turned off for all -b options. */
2052 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2054 /* -bmalware: test the filename given for malware */
2056 else if (Ustrcmp(argrest, "malware") == 0)
2058 if (++i >= argc) { badarg = TRUE; break; }
2059 malware_test_file = argv[i];
2062 /* -bnq: For locally originating messages, do not qualify unqualified
2063 addresses. In the envelope, this causes errors; in header lines they
2066 else if (Ustrcmp(argrest, "nq") == 0)
2068 allow_unqualified_sender = FALSE;
2069 allow_unqualified_recipient = FALSE;
2072 /* -bpxx: List the contents of the mail queue, in various forms. If
2073 the option is -bpc, just a queue count is needed. Otherwise, if the
2074 first letter after p is r, then order is random. */
2076 else if (*argrest == 'p')
2078 if (*(++argrest) == 'c')
2081 if (*(++argrest) != 0) badarg = TRUE;
2085 if (*argrest == 'r')
2087 list_queue_option = 8;
2090 else list_queue_option = 0;
2094 /* -bp: List the contents of the mail queue, top-level only */
2096 if (*argrest == 0) {}
2098 /* -bpu: List the contents of the mail queue, top-level undelivered */
2100 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2102 /* -bpa: List the contents of the mail queue, including all delivered */
2104 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2106 /* Unknown after -bp[r] */
2116 /* -bP: List the configuration variables given as the address list.
2117 Force -v, so configuration errors get displayed. */
2119 else if (Ustrcmp(argrest, "P") == 0)
2121 list_options = TRUE;
2122 debug_selector |= D_v;
2123 debug_file = stderr;
2126 /* -brt: Test retry configuration lookup */
2128 else if (Ustrcmp(argrest, "rt") == 0)
2130 test_retry_arg = i + 1;
2134 /* -brw: Test rewrite configuration */
2136 else if (Ustrcmp(argrest, "rw") == 0)
2138 test_rewrite_arg = i + 1;
2142 /* -bS: Read SMTP commands on standard input, but produce no replies -
2143 all errors are reported by sending messages. */
2145 else if (Ustrcmp(argrest, "S") == 0)
2146 smtp_input = smtp_batched_input = receiving_message = TRUE;
2148 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2149 on standard output. */
2151 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2153 /* -bt: address testing mode */
2155 else if (Ustrcmp(argrest, "t") == 0)
2156 address_test_mode = checking = log_testing_mode = TRUE;
2158 /* -bv: verify addresses */
2160 else if (Ustrcmp(argrest, "v") == 0)
2161 verify_address_mode = checking = log_testing_mode = TRUE;
2163 /* -bvs: verify sender addresses */
2165 else if (Ustrcmp(argrest, "vs") == 0)
2167 verify_address_mode = checking = log_testing_mode = TRUE;
2168 verify_as_sender = TRUE;
2171 /* -bV: Print version string and support details */
2173 else if (Ustrcmp(argrest, "V") == 0)
2175 printf("Exim version %s #%s built %s\n", version_string,
2176 version_cnumber, version_date);
2177 printf("%s\n", CS version_copyright);
2178 version_printed = TRUE;
2179 show_whats_supported(stdout);
2182 /* -bw: inetd wait mode, accept a listening socket as stdin */
2184 else if (*argrest == 'w')
2186 inetd_wait_mode = TRUE;
2187 background_daemon = FALSE;
2188 daemon_listen = TRUE;
2189 if (*(++argrest) != '\0')
2191 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2192 if (inetd_wait_timeout <= 0)
2194 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2204 /* -C: change configuration file list; ignore if it isn't really
2205 a change! Enforce a prefix check if required. */
2210 if(++i < argc) argrest = argv[i]; else
2211 { badarg = TRUE; break; }
2213 if (Ustrcmp(config_main_filelist, argrest) != 0)
2215 #ifdef ALT_CONFIG_PREFIX
2217 int len = Ustrlen(ALT_CONFIG_PREFIX);
2218 uschar *list = argrest;
2220 while((filename = string_nextinlist(&list, &sep, big_buffer,
2221 big_buffer_size)) != NULL)
2223 if ((Ustrlen(filename) < len ||
2224 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2225 Ustrstr(filename, "/../") != NULL) &&
2226 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2228 fprintf(stderr, "-C Permission denied\n");
2233 if (real_uid != root_uid)
2235 #ifdef TRUSTED_CONFIG_LIST
2237 if (real_uid != exim_uid
2238 #ifdef CONFIGURE_OWNER
2239 && real_uid != config_uid
2242 trusted_config = FALSE;
2245 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2248 struct stat statbuf;
2250 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2251 (statbuf.st_uid != root_uid /* owner not root */
2252 #ifdef CONFIGURE_OWNER
2253 && statbuf.st_uid != config_uid /* owner not the special one */
2256 (statbuf.st_gid != root_gid /* group not root */
2257 #ifdef CONFIGURE_GROUP
2258 && statbuf.st_gid != config_gid /* group not the special one */
2260 && (statbuf.st_mode & 020) != 0 /* group writeable */
2262 (statbuf.st_mode & 2) != 0) /* world writeable */
2264 trusted_config = FALSE;
2269 /* Well, the trust list at least is up to scratch... */
2270 void *reset_point = store_get(0);
2271 uschar *trusted_configs[32];
2275 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2277 uschar *start = big_buffer, *nl;
2278 while (*start && isspace(*start))
2282 nl = Ustrchr(start, '\n');
2285 trusted_configs[nr_configs++] = string_copy(start);
2286 if (nr_configs == 32)
2294 uschar *list = argrest;
2296 while (trusted_config && (filename = string_nextinlist(&list,
2297 &sep, big_buffer, big_buffer_size)) != NULL)
2299 for (i=0; i < nr_configs; i++)
2301 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2304 if (i == nr_configs)
2306 trusted_config = FALSE;
2310 store_reset(reset_point);
2314 /* No valid prefixes found in trust_list file. */
2315 trusted_config = FALSE;
2321 /* Could not open trust_list file. */
2322 trusted_config = FALSE;
2326 /* Not root; don't trust config */
2327 trusted_config = FALSE;
2331 config_main_filelist = argrest;
2332 config_changed = TRUE;
2337 /* -D: set up a macro definition */
2340 #ifdef DISABLE_D_OPTION
2341 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2346 macro_item *mlast = NULL;
2349 uschar *s = argrest;
2351 while (isspace(*s)) s++;
2353 if (*s < 'A' || *s > 'Z')
2355 fprintf(stderr, "exim: macro name set by -D must start with "
2356 "an upper case letter\n");
2360 while (isalnum(*s) || *s == '_')
2362 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2366 if (ptr == 0) { badarg = TRUE; break; }
2367 while (isspace(*s)) s++;
2370 if (*s++ != '=') { badarg = TRUE; break; }
2371 while (isspace(*s)) s++;
2374 for (m = macros; m != NULL; m = m->next)
2376 if (Ustrcmp(m->name, name) == 0)
2378 fprintf(stderr, "exim: duplicated -D in command line\n");
2384 m = store_get(sizeof(macro_item) + Ustrlen(name));
2386 m->command_line = TRUE;
2387 if (mlast == NULL) macros = m; else mlast->next = m;
2388 Ustrcpy(m->name, name);
2389 m->replacement = string_copy(s);
2391 if (clmacro_count >= MAX_CLMACROS)
2393 fprintf(stderr, "exim: too many -D options on command line\n");
2396 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2402 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2403 The latter is now a no-op, retained for compatibility only. If -dd is used,
2404 debugging subprocesses of the daemon is disabled. */
2407 if (Ustrcmp(argrest, "ropcr") == 0)
2409 /* drop_cr = TRUE; */
2412 /* Use an intermediate variable so that we don't set debugging while
2413 decoding the debugging bits. */
2417 unsigned int selector = D_default;
2420 if (*argrest == 'd')
2422 debug_daemon = TRUE;
2426 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2427 debug_options_count, US"debug", 0);
2428 debug_selector = selector;
2433 /* -E: This is a local error message. This option is not intended for
2434 external use at all, but is not restricted to trusted callers because it
2435 does no harm (just suppresses certain error messages) and if Exim is run
2436 not setuid root it won't always be trusted when it generates error
2437 messages using this option. If there is a message id following -E, point
2438 message_reference at it, for logging. */
2441 local_error_message = TRUE;
2442 if (mac_ismsgid(argrest)) message_reference = argrest;
2446 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2447 option, so it looks as if historically the -oex options are also callable
2448 without the leading -o. So we have to accept them. Before the switch,
2449 anything starting -oe has been converted to -e. Exim does not support all
2450 of the sendmail error options. */
2453 if (Ustrcmp(argrest, "e") == 0)
2455 arg_error_handling = ERRORS_SENDER;
2456 errors_sender_rc = EXIT_SUCCESS;
2458 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2459 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2460 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2461 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2466 /* -F: Set sender's full name, used instead of the gecos entry from
2467 the password file. Since users can usually alter their gecos entries,
2468 there's no security involved in using this instead. The data can follow
2469 the -F or be in the next argument. */
2474 if(++i < argc) argrest = argv[i]; else
2475 { badarg = TRUE; break; }
2477 originator_name = argrest;
2478 sender_name_forced = TRUE;
2482 /* -f: Set sender's address - this value is only actually used if Exim is
2483 run by a trusted user, or if untrusted_set_sender is set and matches the
2484 address, except that the null address can always be set by any user. The
2485 test for this happens later, when the value given here is ignored when not
2486 permitted. For an untrusted user, the actual sender is still put in Sender:
2487 if it doesn't match the From: header (unless no_local_from_check is set).
2488 The data can follow the -f or be in the next argument. The -r switch is an
2489 obsolete form of -f but since there appear to be programs out there that
2490 use anything that sendmail has ever supported, better accept it - the
2491 synonymizing is done before the switch above.
2493 At this stage, we must allow domain literal addresses, because we don't
2494 know what the setting of allow_domain_literals is yet. Ditto for trailing
2495 dots and strip_trailing_dot. */
2503 if (i+1 < argc) argrest = argv[++i]; else
2504 { badarg = TRUE; break; }
2508 sender_address = string_sprintf(""); /* Ensure writeable memory */
2512 uschar *temp = argrest + Ustrlen(argrest) - 1;
2513 while (temp >= argrest && isspace(*temp)) temp--;
2514 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2515 allow_domain_literals = TRUE;
2516 strip_trailing_dot = TRUE;
2517 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2518 &sender_address_domain, TRUE);
2519 allow_domain_literals = FALSE;
2520 strip_trailing_dot = FALSE;
2521 if (sender_address == NULL)
2523 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2524 return EXIT_FAILURE;
2527 sender_address_forced = TRUE;
2531 /* -G: sendmail invocation to specify that it's a gateway submission and
2532 sendmail may complain about problems instead of fixing them.
2533 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2534 not at this time complain about problems. */
2540 /* -h: Set the hop count for an incoming message. Exim does not currently
2541 support this; it always computes it by counting the Received: headers.
2542 To put it in will require a change to the spool header file format. */
2547 if(++i < argc) argrest = argv[i]; else
2548 { badarg = TRUE; break; }
2550 if (!isdigit(*argrest)) badarg = TRUE;
2554 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2555 not to be documented for sendmail but mailx (at least) uses it) */
2558 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2562 /* -L: set the identifier used for syslog; equivalent to setting
2563 syslog_processname in the config file, but needs to be an admin option. */
2566 if (*argrest == '\0')
2568 if(++i < argc) argrest = argv[i]; else
2569 { badarg = TRUE; break; }
2571 sz = Ustrlen(argrest);
2574 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2575 return EXIT_FAILURE;
2579 fprintf(stderr, "exim: the -L syslog name is too short\n");
2580 return EXIT_FAILURE;
2582 cmdline_syslog_name = argrest;
2586 receiving_message = FALSE;
2588 /* -MC: continue delivery of another message via an existing open
2589 file descriptor. This option is used for an internal call by the
2590 smtp transport when there is a pending message waiting to go to an
2591 address to which it has got a connection. Five subsequent arguments are
2592 required: transport name, host name, IP address, sequence number, and
2593 message_id. Transports may decline to create new processes if the sequence
2594 number gets too big. The channel is stdin. This (-MC) must be the last
2595 argument. There's a subsequent check that the real-uid is privileged.
2597 If we are running in the test harness. delay for a bit, to let the process
2598 that set this one up complete. This makes for repeatability of the logging,
2601 if (Ustrcmp(argrest, "C") == 0)
2603 union sockaddr_46 interface_sock;
2604 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2608 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2609 return EXIT_FAILURE;
2612 if (msg_action_arg >= 0)
2614 fprintf(stderr, "exim: incompatible arguments\n");
2615 return EXIT_FAILURE;
2618 continue_transport = argv[++i];
2619 continue_hostname = argv[++i];
2620 continue_host_address = argv[++i];
2621 continue_sequence = Uatoi(argv[++i]);
2622 msg_action = MSG_DELIVER;
2623 msg_action_arg = ++i;
2624 forced_delivery = TRUE;
2625 queue_run_pid = passed_qr_pid;
2626 queue_run_pipe = passed_qr_pipe;
2628 if (!mac_ismsgid(argv[i]))
2630 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2632 return EXIT_FAILURE;
2635 /* Set up $sending_ip_address and $sending_port */
2637 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2639 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2643 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2645 return EXIT_FAILURE;
2648 if (running_in_test_harness) millisleep(500);
2652 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2653 precedes -MC (see above). The flag indicates that the host to which
2654 Exim is connected has accepted an AUTH sequence. */
2656 else if (Ustrcmp(argrest, "CA") == 0)
2658 smtp_authenticated = TRUE;
2662 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2663 it preceded -MC (see above) */
2665 else if (Ustrcmp(argrest, "CP") == 0)
2667 smtp_use_pipelining = TRUE;
2671 /* -MCQ: pass on the pid of the queue-running process that started
2672 this chain of deliveries and the fd of its synchronizing pipe; this
2673 is useful only when it precedes -MC (see above) */
2675 else if (Ustrcmp(argrest, "CQ") == 0)
2677 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2679 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2684 /* -MCS: set the smtp_use_size flag; this is useful only when it
2685 precedes -MC (see above) */
2687 else if (Ustrcmp(argrest, "CS") == 0)
2689 smtp_use_size = TRUE;
2693 /* -MCT: set the tls_offered flag; this is useful only when it
2694 precedes -MC (see above). The flag indicates that the host to which
2695 Exim is connected has offered TLS support. */
2698 else if (Ustrcmp(argrest, "CT") == 0)
2705 /* -M[x]: various operations on the following list of message ids:
2706 -M deliver the messages, ignoring next retry times and thawing
2707 -Mc deliver the messages, checking next retry times, no thawing
2708 -Mf freeze the messages
2709 -Mg give up on the messages
2710 -Mt thaw the messages
2711 -Mrm remove the messages
2712 In the above cases, this must be the last option. There are also the
2713 following options which are followed by a single message id, and which
2714 act on that message. Some of them use the "recipient" addresses as well.
2715 -Mar add recipient(s)
2716 -Mmad mark all recipients delivered
2717 -Mmd mark recipients(s) delivered
2719 -Mset load a message for use with -be
2721 -Mvc show copy (of whole message, in RFC 2822 format)
2726 else if (*argrest == 0)
2728 msg_action = MSG_DELIVER;
2729 forced_delivery = deliver_force_thaw = TRUE;
2731 else if (Ustrcmp(argrest, "ar") == 0)
2733 msg_action = MSG_ADD_RECIPIENT;
2734 one_msg_action = TRUE;
2736 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2737 else if (Ustrcmp(argrest, "es") == 0)
2739 msg_action = MSG_EDIT_SENDER;
2740 one_msg_action = TRUE;
2742 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2743 else if (Ustrcmp(argrest, "g") == 0)
2745 msg_action = MSG_DELIVER;
2746 deliver_give_up = TRUE;
2748 else if (Ustrcmp(argrest, "mad") == 0)
2750 msg_action = MSG_MARK_ALL_DELIVERED;
2752 else if (Ustrcmp(argrest, "md") == 0)
2754 msg_action = MSG_MARK_DELIVERED;
2755 one_msg_action = TRUE;
2757 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2758 else if (Ustrcmp(argrest, "set") == 0)
2760 msg_action = MSG_LOAD;
2761 one_msg_action = TRUE;
2763 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2764 else if (Ustrcmp(argrest, "vb") == 0)
2766 msg_action = MSG_SHOW_BODY;
2767 one_msg_action = TRUE;
2769 else if (Ustrcmp(argrest, "vc") == 0)
2771 msg_action = MSG_SHOW_COPY;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "vh") == 0)
2776 msg_action = MSG_SHOW_HEADER;
2777 one_msg_action = TRUE;
2779 else if (Ustrcmp(argrest, "vl") == 0)
2781 msg_action = MSG_SHOW_LOG;
2782 one_msg_action = TRUE;
2784 else { badarg = TRUE; break; }
2786 /* All the -Mxx options require at least one message id. */
2788 msg_action_arg = i + 1;
2789 if (msg_action_arg >= argc)
2791 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2792 return EXIT_FAILURE;
2795 /* Some require only message ids to follow */
2797 if (!one_msg_action)
2800 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2802 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2804 return EXIT_FAILURE;
2806 goto END_ARG; /* Remaining args are ids */
2809 /* Others require only one message id, possibly followed by addresses,
2810 which will be handled as normal arguments. */
2814 if (!mac_ismsgid(argv[msg_action_arg]))
2816 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2817 argv[msg_action_arg], arg);
2818 return EXIT_FAILURE;
2825 /* Some programs seem to call the -om option without the leading o;
2826 for sendmail it askes for "me too". Exim always does this. */
2829 if (*argrest != 0) badarg = TRUE;
2833 /* -N: don't do delivery - a debugging option that stops transports doing
2834 their thing. It implies debugging at the D_v level. */
2839 dont_deliver = TRUE;
2840 debug_selector |= D_v;
2841 debug_file = stderr;
2847 /* -n: This means "don't alias" in sendmail, apparently.
2848 For normal invocations, it has no effect.
2849 It may affect some other options. */
2855 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2856 option to the specified value. This form uses long names. We need to handle
2857 -O option=value and -Ooption=value. */
2864 fprintf(stderr, "exim: string expected after -O\n");
2872 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2875 if (*argrest == 'A')
2877 alias_arg = argrest + 1;
2878 if (alias_arg[0] == 0)
2880 if (i+1 < argc) alias_arg = argv[++i]; else
2882 fprintf(stderr, "exim: string expected after -oA\n");
2888 /* -oB: Set a connection message max value for remote deliveries */
2890 else if (*argrest == 'B')
2892 uschar *p = argrest + 1;
2895 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2897 connection_max_messages = 1;
2906 fprintf(stderr, "exim: number expected after -oB\n");
2909 connection_max_messages = Uatoi(p);
2913 /* -odb: background delivery */
2915 else if (Ustrcmp(argrest, "db") == 0)
2917 synchronous_delivery = FALSE;
2918 arg_queue_only = FALSE;
2919 queue_only_set = TRUE;
2922 /* -odf: foreground delivery (smail-compatible option); same effect as
2923 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2926 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2928 synchronous_delivery = TRUE;
2929 arg_queue_only = FALSE;
2930 queue_only_set = TRUE;
2933 /* -odq: queue only */
2935 else if (Ustrcmp(argrest, "dq") == 0)
2937 synchronous_delivery = FALSE;
2938 arg_queue_only = TRUE;
2939 queue_only_set = TRUE;
2942 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2943 but no remote delivery */
2945 else if (Ustrcmp(argrest, "dqs") == 0)
2948 arg_queue_only = FALSE;
2949 queue_only_set = TRUE;
2952 /* -oex: Sendmail error flags. As these are also accepted without the
2953 leading -o prefix, for compatibility with vacation and other callers,
2954 they are handled with -e above. */
2956 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2957 -oitrue: Another sendmail syntax for the same */
2959 else if (Ustrcmp(argrest, "i") == 0 ||
2960 Ustrcmp(argrest, "itrue") == 0)
2963 /* -oM*: Set various characteristics for an incoming message; actually
2964 acted on for trusted callers only. */
2966 else if (*argrest == 'M')
2970 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2974 /* -oMa: Set sender host address */
2976 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2978 /* -oMaa: Set authenticator name */
2980 else if (Ustrcmp(argrest, "Maa") == 0)
2981 sender_host_authenticated = argv[++i];
2983 /* -oMas: setting authenticated sender */
2985 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2987 /* -oMai: setting authenticated id */
2989 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2991 /* -oMi: Set incoming interface address */
2993 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2995 /* -oMm: Message reference */
2997 else if (Ustrcmp(argrest, "Mm") == 0)
2999 if (!mac_ismsgid(argv[i+1]))
3001 fprintf(stderr,"-oMm must be a valid message ID\n");
3004 if (!trusted_config)
3006 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3009 message_reference = argv[++i];
3012 /* -oMr: Received protocol */
3014 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3016 /* -oMs: Set sender host name */
3018 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3020 /* -oMt: Set sender ident */
3022 else if (Ustrcmp(argrest, "Mt") == 0)
3024 sender_ident_set = TRUE;
3025 sender_ident = argv[++i];
3028 /* Else a bad argument */
3037 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3038 seem to call this as -m (undocumented), so that is also accepted (see
3041 else if (Ustrcmp(argrest, "m") == 0) {}
3043 /* -oo: An ancient flag for old-style addresses which still seems to
3044 crop up in some calls (see in SCO). */
3046 else if (Ustrcmp(argrest, "o") == 0) {}
3048 /* -oP <name>: set pid file path for daemon */
3050 else if (Ustrcmp(argrest, "P") == 0)
3051 override_pid_file_path = argv[++i];
3053 /* -or <n>: set timeout for non-SMTP acceptance
3054 -os <n>: set timeout for SMTP acceptance */
3056 else if (*argrest == 'r' || *argrest == 's')
3058 int *tp = (*argrest == 'r')?
3059 &arg_receive_timeout : &arg_smtp_receive_timeout;
3060 if (argrest[1] == 0)
3062 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3064 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3067 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3072 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3074 else if (Ustrcmp(argrest, "X") == 0)
3075 override_local_interfaces = argv[++i];
3077 /* Unknown -o argument */
3083 /* -ps: force Perl startup; -pd force delayed Perl startup */
3087 if (*argrest == 's' && argrest[1] == 0)
3089 perl_start_option = 1;
3092 if (*argrest == 'd' && argrest[1] == 0)
3094 perl_start_option = -1;
3099 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3100 which sets the host protocol and host name */
3104 if (i+1 < argc) argrest = argv[++i]; else
3105 { badarg = TRUE; break; }
3110 uschar *hn = Ustrchr(argrest, ':');
3113 received_protocol = argrest;
3117 received_protocol = string_copyn(argrest, hn - argrest);
3118 sender_host_name = hn + 1;
3125 receiving_message = FALSE;
3126 if (queue_interval >= 0)
3128 fprintf(stderr, "exim: -q specified more than once\n");
3132 /* -qq...: Do queue runs in a 2-stage manner */
3134 if (*argrest == 'q')
3136 queue_2stage = TRUE;
3140 /* -qi...: Do only first (initial) deliveries */
3142 if (*argrest == 'i')
3144 queue_run_first_delivery = TRUE;
3148 /* -qf...: Run the queue, forcing deliveries
3149 -qff..: Ditto, forcing thawing as well */
3151 if (*argrest == 'f')
3153 queue_run_force = TRUE;
3154 if (*(++argrest) == 'f')
3156 deliver_force_thaw = TRUE;
3161 /* -q[f][f]l...: Run the queue only on local deliveries */
3163 if (*argrest == 'l')
3165 queue_run_local = TRUE;
3169 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3170 optionally starting from a given message id. */
3172 if (*argrest == 0 &&
3173 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3176 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3177 start_queue_run_id = argv[++i];
3178 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3179 stop_queue_run_id = argv[++i];
3182 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3183 optionally local only. */
3188 queue_interval = readconf_readtime(argrest, 0, FALSE);
3190 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3191 if (queue_interval <= 0)
3193 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3200 case 'R': /* Synonymous with -qR... */
3201 receiving_message = FALSE;
3203 /* -Rf: As -R (below) but force all deliveries,
3204 -Rff: Ditto, but also thaw all frozen messages,
3205 -Rr: String is regex
3206 -Rrf: Regex and force
3207 -Rrff: Regex and force and thaw
3209 in all cases provided there are no further characters in this
3215 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3217 if (Ustrcmp(argrest, rsopts[i]) == 0)
3219 if (i != 2) queue_run_force = TRUE;
3220 if (i >= 2) deliver_selectstring_regex = TRUE;
3221 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3222 argrest += Ustrlen(rsopts[i]);
3227 /* -R: Set string to match in addresses for forced queue run to
3228 pick out particular messages. */
3232 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3234 fprintf(stderr, "exim: string expected after -R\n");
3238 else deliver_selectstring = argrest;
3242 /* -r: an obsolete synonym for -f (see above) */
3245 /* -S: Like -R but works on sender. */
3247 case 'S': /* Synonymous with -qS... */
3248 receiving_message = FALSE;
3250 /* -Sf: As -S (below) but force all deliveries,
3251 -Sff: Ditto, but also thaw all frozen messages,
3252 -Sr: String is regex
3253 -Srf: Regex and force
3254 -Srff: Regex and force and thaw
3256 in all cases provided there are no further characters in this
3262 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3264 if (Ustrcmp(argrest, rsopts[i]) == 0)
3266 if (i != 2) queue_run_force = TRUE;
3267 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3268 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3269 argrest += Ustrlen(rsopts[i]);
3274 /* -S: Set string to match in addresses for forced queue run to
3275 pick out particular messages. */
3279 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3281 fprintf(stderr, "exim: string expected after -S\n");
3285 else deliver_selectstring_sender = argrest;
3288 /* -Tqt is an option that is exclusively for use by the testing suite.
3289 It is not recognized in other circumstances. It allows for the setting up
3290 of explicit "queue times" so that various warning/retry things can be
3291 tested. Otherwise variability of clock ticks etc. cause problems. */
3294 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3295 fudged_queue_times = argv[++i];
3300 /* -t: Set flag to extract recipients from body of message. */
3303 if (*argrest == 0) extract_recipients = TRUE;
3305 /* -ti: Set flag to extract recipients from body of message, and also
3306 specify that dot does not end the message. */
3308 else if (Ustrcmp(argrest, "i") == 0)
3310 extract_recipients = TRUE;
3314 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3317 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3324 /* -U: This means "initial user submission" in sendmail, apparently. The
3325 doc claims that in future sendmail may refuse syntactically invalid
3326 messages instead of fixing them. For the moment, we just ignore it. */
3332 /* -v: verify things - this is a very low-level debugging */
3337 debug_selector |= D_v;
3338 debug_file = stderr;
3344 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3346 The -x flag tells the sendmail command that mail from a local
3347 mail program has National Language Support (NLS) extended characters
3348 in the body of the mail item. The sendmail command can send mail with
3349 extended NLS characters across networks that normally corrupts these
3352 As Exim is 8-bit clean, it just ignores this flag. */
3355 if (*argrest != 0) badarg = TRUE;
3358 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3359 logs to that file. We swallow the parameter and otherwise ignore it. */
3362 if (*argrest == '\0')
3366 fprintf(stderr, "exim: string expected after -X\n");
3372 /* All other initial characters are errors */
3377 } /* End of high-level switch statement */
3379 /* Failed to recognize the option, or syntax error */
3383 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3384 "option %s\n", arg);
3390 /* If -R or -S have been specified without -q, assume a single queue run. */
3392 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3393 queue_interval < 0) queue_interval = 0;
3397 /* If usage_wanted is set we call the usage function - which never returns */
3398 if (usage_wanted) exim_usage(called_as);
3400 /* Arguments have been processed. Check for incompatibilities. */
3402 (smtp_input || extract_recipients || recipients_arg < argc) &&
3403 (daemon_listen || queue_interval >= 0 || bi_option ||
3404 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3405 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3408 msg_action_arg > 0 &&
3409 (daemon_listen || queue_interval >= 0 || list_options ||
3410 (checking && msg_action != MSG_LOAD) ||
3411 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3414 (daemon_listen || queue_interval >= 0) &&
3415 (sender_address != NULL || list_options || list_queue || checking ||
3419 daemon_listen && queue_interval == 0
3422 inetd_wait_mode && queue_interval >= 0
3426 (checking || smtp_input || extract_recipients ||
3427 filter_test != FTEST_NONE || bi_option)
3430 verify_address_mode &&
3431 (address_test_mode || smtp_input || extract_recipients ||
3432 filter_test != FTEST_NONE || bi_option)
3435 address_test_mode && (smtp_input || extract_recipients ||
3436 filter_test != FTEST_NONE || bi_option)
3439 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3443 deliver_selectstring != NULL && queue_interval < 0
3446 msg_action == MSG_LOAD &&
3447 (!expansion_test || expansion_test_message != NULL)
3451 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3455 /* If debugging is set up, set the file and the file descriptor to pass on to
3456 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3457 to run in the foreground. */
3459 if (debug_selector != 0)
3461 debug_file = stderr;
3462 debug_fd = fileno(debug_file);
3463 background_daemon = FALSE;
3464 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3465 if (debug_selector != D_v) /* -v only doesn't show this */
3467 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3468 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3470 if (!version_printed)
3471 show_whats_supported(stderr);
3475 /* When started with root privilege, ensure that the limits on the number of
3476 open files and the number of processes (where that is accessible) are
3477 sufficiently large, or are unset, in case Exim has been called from an
3478 environment where the limits are screwed down. Not all OS have the ability to
3479 change some of these limits. */
3483 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3489 #ifdef RLIMIT_NOFILE
3490 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3492 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3494 rlp.rlim_cur = rlp.rlim_max = 0;
3497 /* I originally chose 1000 as a nice big number that was unlikely to
3498 be exceeded. It turns out that some older OS have a fixed upper limit of
3501 if (rlp.rlim_cur < 1000)
3503 rlp.rlim_cur = rlp.rlim_max = 1000;
3504 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3506 rlp.rlim_cur = rlp.rlim_max = 256;
3507 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3508 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3515 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3517 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3519 rlp.rlim_cur = rlp.rlim_max = 0;
3522 #ifdef RLIM_INFINITY
3523 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3525 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3527 if (rlp.rlim_cur < 1000)
3529 rlp.rlim_cur = rlp.rlim_max = 1000;
3531 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3532 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3538 /* Exim is normally entered as root (but some special configurations are
3539 possible that don't do this). However, it always spins off sub-processes that
3540 set their uid and gid as required for local delivery. We don't want to pass on
3541 any extra groups that root may belong to, so we want to get rid of them all at
3544 We need to obey setgroups() at this stage, before possibly giving up root
3545 privilege for a changed configuration file, but later on we might need to
3546 check on the additional groups for the admin user privilege - can't do that
3547 till after reading the config, which might specify the exim gid. Therefore,
3548 save the group list here first. */
3550 group_count = getgroups(NGROUPS_MAX, group_list);
3551 if (group_count < 0)
3553 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3557 /* There is a fundamental difference in some BSD systems in the matter of
3558 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3559 known not to be different. On the "different" systems there is a single group
3560 list, and the first entry in it is the current group. On all other versions of
3561 Unix there is a supplementary group list, which is in *addition* to the current
3562 group. Consequently, to get rid of all extraneous groups on a "standard" system
3563 you pass over 0 groups to setgroups(), while on a "different" system you pass
3564 over a single group - the current group, which is always the first group in the
3565 list. Calling setgroups() with zero groups on a "different" system results in
3566 an error return. The following code should cope with both types of system.
3568 However, if this process isn't running as root, setgroups() can't be used
3569 since you have to be root to run it, even if throwing away groups. Not being
3570 root here happens only in some unusual configurations. We just ignore the
3573 if (setgroups(0, NULL) != 0)
3575 if (setgroups(1, group_list) != 0 && !unprivileged)
3577 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3582 /* If the configuration file name has been altered by an argument on the
3583 command line (either a new file name or a macro definition) and the caller is
3584 not root, or if this is a filter testing run, remove any setuid privilege the
3585 program has and run as the underlying user.
3587 The exim user is locked out of this, which severely restricts the use of -C
3590 Otherwise, set the real ids to the effective values (should be root unless run
3591 from inetd, which it can either be root or the exim uid, if one is configured).
3593 There is a private mechanism for bypassing some of this, in order to make it
3594 possible to test lots of configurations automatically, without having either to
3595 recompile each time, or to patch in an actual configuration file name and other
3596 values (such as the path name). If running in the test harness, pretend that
3597 configuration file changes and macro definitions haven't happened. */
3600 (!trusted_config || /* Config changed, or */
3601 !macros_trusted()) && /* impermissible macros and */
3602 real_uid != root_uid && /* Not root, and */
3603 !running_in_test_harness /* Not fudged */
3605 expansion_test /* expansion testing */
3607 filter_test != FTEST_NONE) /* Filter testing */
3609 setgroups(group_count, group_list);
3610 exim_setugid(real_uid, real_gid, FALSE,
3611 US"-C, -D, -be or -bf forces real uid");
3612 removed_privilege = TRUE;
3614 /* In the normal case when Exim is called like this, stderr is available
3615 and should be used for any logging information because attempts to write
3616 to the log will usually fail. To arrange this, we unset really_exim. However,
3617 if no stderr is available there is no point - we might as well have a go
3618 at the log (if it fails, syslog will be written).
3620 Note that if the invoker is Exim, the logs remain available. Messing with
3621 this causes unlogged successful deliveries. */
3623 if ((log_stderr != NULL) && (real_uid != exim_uid))
3624 really_exim = FALSE;
3627 /* Privilege is to be retained for the moment. It may be dropped later,
3628 depending on the job that this Exim process has been asked to do. For now, set
3629 the real uid to the effective so that subsequent re-execs of Exim are done by a
3632 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3634 /* If testing a filter, open the file(s) now, before wasting time doing other
3635 setups and reading the message. */
3637 if ((filter_test & FTEST_SYSTEM) != 0)
3639 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3642 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3644 return EXIT_FAILURE;
3648 if ((filter_test & FTEST_USER) != 0)
3650 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3653 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3655 return EXIT_FAILURE;
3659 /* Initialise lookup_list
3660 If debugging, already called above via version reporting.
3661 In either case, we initialise the list of available lookups while running
3662 as root. All dynamically modules are loaded from a directory which is
3663 hard-coded into the binary and is code which, if not a module, would be
3664 part of Exim already. Ability to modify the content of the directory
3665 is equivalent to the ability to modify a setuid binary!
3667 This needs to happen before we read the main configuration. */
3670 /* Read the main runtime configuration data; this gives up if there
3671 is a failure. It leaves the configuration file open so that the subsequent
3672 configuration data for delivery can be read if needed. */
3676 /* If an action on specific messages is requested, or if a daemon or queue
3677 runner is being started, we need to know if Exim was called by an admin user.
3678 This is the case if the real user is root or exim, or if the real group is
3679 exim, or if one of the supplementary groups is exim or a group listed in
3680 admin_groups. We don't fail all message actions immediately if not admin_user,
3681 since some actions can be performed by non-admin users. Instead, set admin_user
3682 for later interrogation. */
3684 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3689 for (i = 0; i < group_count; i++)
3691 if (group_list[i] == exim_gid) admin_user = TRUE;
3692 else if (admin_groups != NULL)
3694 for (j = 1; j <= (int)(admin_groups[0]); j++)
3695 if (admin_groups[j] == group_list[i])
3696 { admin_user = TRUE; break; }
3698 if (admin_user) break;
3702 /* Another group of privileged users are the trusted users. These are root,
3703 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3704 are permitted to specify sender_addresses with -f on the command line, and
3705 other message parameters as well. */
3707 if (real_uid == root_uid || real_uid == exim_uid)
3708 trusted_caller = TRUE;
3713 if (trusted_users != NULL)
3715 for (i = 1; i <= (int)(trusted_users[0]); i++)
3716 if (trusted_users[i] == real_uid)
3717 { trusted_caller = TRUE; break; }
3720 if (!trusted_caller && trusted_groups != NULL)
3722 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3724 if (trusted_groups[i] == real_gid)
3725 trusted_caller = TRUE;
3726 else for (j = 0; j < group_count; j++)
3728 if (trusted_groups[i] == group_list[j])
3729 { trusted_caller = TRUE; break; }
3731 if (trusted_caller) break;
3736 /* Handle the decoding of logging options. */
3738 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3739 log_selector_string, log_options, log_options_count, US"log", 0);
3743 debug_printf("configuration file is %s\n", config_main_filename);
3744 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3745 log_extra_selector);
3748 /* If domain literals are not allowed, check the sender address that was
3749 supplied with -f. Ditto for a stripped trailing dot. */
3751 if (sender_address != NULL)
3753 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3755 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3756 "allowed\n", sender_address);
3757 return EXIT_FAILURE;
3759 if (f_end_dot && !strip_trailing_dot)
3761 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3762 "(trailing dot not allowed)\n", sender_address);
3763 return EXIT_FAILURE;
3767 /* See if an admin user overrode our logging. */
3769 if (cmdline_syslog_name != NULL)
3773 syslog_processname = cmdline_syslog_name;
3774 log_file_path = string_copy(CUS"syslog");
3778 /* not a panic, non-privileged users should not be able to spam paniclog */
3780 "exim: you lack sufficient privilege to specify syslog process name\n");
3781 return EXIT_FAILURE;
3785 /* Paranoia check of maximum lengths of certain strings. There is a check
3786 on the length of the log file path in log.c, which will come into effect
3787 if there are any calls to write the log earlier than this. However, if we
3788 get this far but the string is very long, it is better to stop now than to
3789 carry on and (e.g.) receive a message and then have to collapse. The call to
3790 log_write() from here will cause the ultimate panic collapse if the complete
3791 file name exceeds the buffer length. */
3793 if (Ustrlen(log_file_path) > 200)
3794 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3795 "log_file_path is longer than 200 chars: aborting");
3797 if (Ustrlen(pid_file_path) > 200)
3798 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3799 "pid_file_path is longer than 200 chars: aborting");
3801 if (Ustrlen(spool_directory) > 200)
3802 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3803 "spool_directory is longer than 200 chars: aborting");
3805 /* Length check on the process name given to syslog for its TAG field,
3806 which is only permitted to be 32 characters or less. See RFC 3164. */
3808 if (Ustrlen(syslog_processname) > 32)
3809 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3810 "syslog_processname is longer than 32 chars: aborting");
3812 /* In some operating systems, the environment variable TMPDIR controls where
3813 temporary files are created; Exim doesn't use these (apart from when delivering
3814 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3815 If TMPDIR is found in the environment, reset it to the value defined in the
3816 TMPDIR macro, if this macro is defined. */
3821 for (p = USS environ; *p != NULL; p++)
3823 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3824 Ustrcmp(*p+7, TMPDIR) != 0)
3826 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3827 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3829 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3835 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3836 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3837 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3838 called by a user who has set the TZ variable. This then affects the timestamps
3839 in log files and in Received: headers, and any created Date: header lines. The
3840 required timezone is settable in the configuration file, so nothing can be done
3841 about this earlier - but hopefully nothing will normally be logged earlier than
3842 this. We have to make a new environment if TZ is wrong, but don't bother if
3843 timestamps_utc is set, because then all times are in UTC anyway. */
3845 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3847 timestamps_utc = TRUE;
3851 uschar *envtz = US getenv("TZ");
3852 if ((envtz == NULL && timezone_string != NULL) ||
3854 (timezone_string == NULL ||
3855 Ustrcmp(timezone_string, envtz) != 0)))
3857 uschar **p = USS environ;
3861 while (*p++ != NULL) count++;
3862 if (envtz == NULL) count++;
3863 newp = new = malloc(sizeof(uschar *) * (count + 1));
3864 for (p = USS environ; *p != NULL; p++)
3866 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3869 if (timezone_string != NULL)
3871 *newp = malloc(Ustrlen(timezone_string) + 4);
3872 sprintf(CS *newp++, "TZ=%s", timezone_string);
3877 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3878 tod_stamp(tod_log));
3882 /* Handle the case when we have removed the setuid privilege because of -C or
3883 -D. This means that the caller of Exim was not root.
3885 There is a problem if we were running as the Exim user. The sysadmin may
3886 expect this case to retain privilege because "the binary was called by the
3887 Exim user", but it hasn't, because either the -D option set macros, or the
3888 -C option set a non-trusted configuration file. There are two possibilities:
3890 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3891 to do message deliveries. Thus, the fact that it is running as a
3892 non-privileged user is plausible, and might be wanted in some special
3893 configurations. However, really_exim will have been set false when
3894 privilege was dropped, to stop Exim trying to write to its normal log
3895 files. Therefore, re-enable normal log processing, assuming the sysadmin
3896 has set up the log directory correctly.
3898 (2) If deliver_drop_privilege is not set, the configuration won't work as
3899 apparently intended, and so we log a panic message. In order to retain
3900 root for -C or -D, the caller must either be root or be invoking a
3901 trusted configuration file (when deliver_drop_privilege is false). */
3903 if (removed_privilege && (!trusted_config || macros != NULL) &&
3904 real_uid == exim_uid)
3906 if (deliver_drop_privilege)
3907 really_exim = TRUE; /* let logging work normally */
3909 log_write(0, LOG_MAIN|LOG_PANIC,
3910 "exim user lost privilege for using %s option",
3911 trusted_config? "-D" : "-C");
3914 /* Start up Perl interpreter if Perl support is configured and there is a
3915 perl_startup option, and the configuration or the command line specifies
3916 initializing starting. Note that the global variables are actually called
3917 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3920 if (perl_start_option != 0)
3921 opt_perl_at_start = (perl_start_option > 0);
3922 if (opt_perl_at_start && opt_perl_startup != NULL)
3925 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3926 errstr = init_perl(opt_perl_startup);
3929 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3930 return EXIT_FAILURE;
3932 opt_perl_started = TRUE;
3934 #endif /* EXIM_PERL */
3936 /* Log the arguments of the call if the configuration file said so. This is
3937 a debugging feature for finding out what arguments certain MUAs actually use.
3938 Don't attempt it if logging is disabled, or if listing variables or if
3939 verifying/testing addresses or expansions. */
3941 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3942 && really_exim && !list_options && !checking)
3945 uschar *p = big_buffer;
3947 Ustrcpy(p, "cwd= (failed)");
3948 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3950 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3952 for (i = 0; i < argc; i++)
3954 int len = Ustrlen(argv[i]);
3957 if (p + len + 8 >= big_buffer + big_buffer_size)
3960 log_write(0, LOG_MAIN, "%s", big_buffer);
3961 Ustrcpy(big_buffer, "...");
3964 printing = string_printing(argv[i]);
3965 if (printing[0] == 0) quote = US"\""; else
3967 uschar *pp = printing;
3969 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3971 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3972 (p - big_buffer) - 4), printing, quote);
3976 if ((log_extra_selector & LX_arguments) != 0)
3977 log_write(0, LOG_MAIN, "%s", big_buffer);
3979 debug_printf("%s\n", big_buffer);
3982 /* Set the working directory to be the top-level spool directory. We don't rely
3983 on this in the code, which always uses fully qualified names, but it's useful
3984 for core dumps etc. Don't complain if it fails - the spool directory might not
3985 be generally accessible and calls with the -C option (and others) have lost
3986 privilege by now. Before the chdir, we try to ensure that the directory exists.
3989 if (Uchdir(spool_directory) != 0)
3992 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3993 dummy = /* quieten compiler */ Uchdir(spool_directory);
3996 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3997 alias file. Exim doesn't have such a concept, but this call is screwed into
3998 Sun's YP makefiles. Handle this by calling a configured script, as the real
3999 user who called Exim. The -oA option can be used to pass an argument to the
4004 (void)fclose(config_file);
4005 if (bi_command != NULL)
4009 argv[i++] = bi_command;
4010 if (alias_arg != NULL) argv[i++] = alias_arg;
4013 setgroups(group_count, group_list);
4014 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4016 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4017 (argv[1] == NULL)? US"" : argv[1]);
4019 execv(CS argv[0], (char *const *)argv);
4020 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4025 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4030 /* We moved the admin/trusted check to be immediately after reading the
4031 configuration file. We leave these prints here to ensure that syslog setup,
4032 logfile setup, and so on has already happened. */
4034 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4035 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4037 /* Only an admin user may start the daemon or force a queue run in the default
4038 configuration, but the queue run restriction can be relaxed. Only an admin
4039 user may request that a message be returned to its sender forthwith. Only an
4040 admin user may specify a debug level greater than D_v (because it might show
4041 passwords, etc. in lookup queries). Only an admin user may request a queue
4042 count. Only an admin user can use the test interface to scan for email
4043 (because Exim will be in the spool dir and able to look at mails). */
4047 BOOL debugset = (debug_selector & ~D_v) != 0;
4048 if (deliver_give_up || daemon_listen || malware_test_file ||
4049 (count_queue && queue_list_requires_admin) ||
4050 (list_queue && queue_list_requires_admin) ||
4051 (queue_interval >= 0 && prod_requires_admin) ||
4052 (debugset && !running_in_test_harness))
4054 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4059 /* If the real user is not root or the exim uid, the argument for passing
4060 in an open TCP/IP connection for another message is not permitted, nor is
4061 running with the -N option for any delivery action, unless this call to exim is
4062 one that supplied an input message, or we are using a patched exim for
4063 regression testing. */
4065 if (real_uid != root_uid && real_uid != exim_uid &&
4066 (continue_hostname != NULL ||
4068 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4069 )) && !running_in_test_harness)
4071 fprintf(stderr, "exim: Permission denied\n");
4072 return EXIT_FAILURE;
4075 /* If the caller is not trusted, certain arguments are ignored when running for
4076 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4077 Note that authority for performing certain actions on messages is tested in the
4078 queue_action() function. */
4080 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4082 sender_host_name = sender_host_address = interface_address =
4083 sender_ident = received_protocol = NULL;
4084 sender_host_port = interface_port = 0;
4085 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4088 /* If a sender host address is set, extract the optional port number off the
4089 end of it and check its syntax. Do the same thing for the interface address.
4090 Exim exits if the syntax is bad. */
4094 if (sender_host_address != NULL)
4095 sender_host_port = check_port(sender_host_address);
4096 if (interface_address != NULL)
4097 interface_port = check_port(interface_address);
4100 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4105 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4106 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4110 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4111 return EXIT_FAILURE;
4115 /* If an SMTP message is being received check to see if the standard input is a
4116 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4117 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4122 union sockaddr_46 inetd_sock;
4123 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4124 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4126 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4127 if (family == AF_INET || family == AF_INET6)
4129 union sockaddr_46 interface_sock;
4130 size = sizeof(interface_sock);
4132 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4133 interface_address = host_ntoa(-1, &interface_sock, NULL,
4136 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4138 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4141 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4142 NULL, &sender_host_port);
4143 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4144 "inetd is not supported when mua_wrapper is set");
4149 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4150 return EXIT_FAILURE;
4156 /* If the load average is going to be needed while receiving a message, get it
4157 now for those OS that require the first call to os_getloadavg() to be done as
4158 root. There will be further calls later for each message received. */
4160 #ifdef LOAD_AVG_NEEDS_ROOT
4161 if (receiving_message &&
4162 (queue_only_load >= 0 ||
4163 (is_inetd && smtp_load_reserve >= 0)
4166 load_average = OS_GETLOADAVG();
4170 /* The queue_only configuration option can be overridden by -odx on the command
4171 line, except that if queue_only_override is false, queue_only cannot be unset
4172 from the command line. */
4174 if (queue_only_set && (queue_only_override || arg_queue_only))
4175 queue_only = arg_queue_only;
4177 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4180 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4181 if (arg_smtp_receive_timeout >= 0)
4182 smtp_receive_timeout = arg_smtp_receive_timeout;
4184 /* If Exim was started with root privilege, unless we have already removed the
4185 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4186 except when starting the daemon or doing some kind of delivery or address
4187 testing (-bt). These are the only cases when root need to be retained. We run
4188 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4189 retained only for starting the daemon. We always do the initgroups() in this
4190 situation (controlled by the TRUE below), in order to be as close as possible
4191 to the state Exim usually runs in. */
4193 if (!unprivileged && /* originally had root AND */
4194 !removed_privilege && /* still got root AND */
4195 !daemon_listen && /* not starting the daemon */
4196 queue_interval <= 0 && /* (either kind of daemon) */
4198 deliver_drop_privilege || /* requested unprivileged */
4200 queue_interval < 0 && /* not running the queue */
4201 (msg_action_arg < 0 || /* and */
4202 msg_action != MSG_DELIVER) && /* not delivering and */
4203 (!checking || !address_test_mode) /* not address checking */
4207 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4210 /* When we are retaining a privileged uid, we still change to the exim gid. */
4215 rv = setgid(exim_gid);
4216 /* Impact of failure is that some stuff might end up with an incorrect group.
4217 We track this for failures from root, since any attempt to change privilege
4218 by root should succeed and failures should be examined. For non-root,
4219 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4220 no need to complain then. */
4223 if (!(unprivileged || removed_privilege))
4226 "exim: changing group failed: %s\n", strerror(errno));
4230 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4231 (long int)exim_gid, strerror(errno));
4235 /* Handle a request to scan a file for malware */
4236 if (malware_test_file)
4238 #ifdef WITH_CONTENT_SCAN
4240 set_process_info("scanning file for malware");
4241 result = malware_in_file(malware_test_file);
4244 printf("No malware found.\n");
4249 printf("Malware lookup returned non-okay/fail: %d\n", result);
4253 printf("Malware found: %s\n", malware_name);
4255 printf("Malware scan detected malware of unknown name.\n");
4257 printf("Malware scanning not enabled at compile time.\n");
4262 /* Handle a request to list the delivery queue */
4266 set_process_info("listing the queue");
4267 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4271 /* Handle a request to count the delivery queue */
4275 set_process_info("counting the queue");
4280 /* Handle actions on specific messages, except for the force delivery and
4281 message load actions, which are done below. Some actions take a whole list of
4282 message ids, which are known to continue up to the end of the arguments. Others
4283 take a single message id and then operate on the recipients list. */
4285 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4287 int yield = EXIT_SUCCESS;
4288 set_process_info("acting on specified messages");
4290 if (!one_msg_action)
4292 for (i = msg_action_arg; i < argc; i++)
4293 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4294 yield = EXIT_FAILURE;
4297 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4298 recipients_arg)) yield = EXIT_FAILURE;
4302 /* We used to set up here to skip reading the ACL section, on
4303 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4304 Now, since the intro of the ${acl } expansion, ACL definitions may be
4305 needed in transports so we lost the optimisation. */
4309 /* The configuration data will have been read into POOL_PERM because we won't
4310 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4311 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4312 configuration were read into POOL_MAIN, because we don't do any resets till
4313 later on. However, it seems right, and it does ensure that both pools get used.
4316 store_pool = POOL_MAIN;
4318 /* Handle the -brt option. This is for checking out retry configurations.
4319 The next three arguments are a domain name or a complete address, and
4320 optionally two error numbers. All it does is to call the function that
4321 scans the retry configuration data. */
4323 if (test_retry_arg >= 0)
4325 retry_config *yield;
4326 int basic_errno = 0;
4330 if (test_retry_arg >= argc)
4332 printf("-brt needs a domain or address argument\n");
4333 exim_exit(EXIT_FAILURE);
4335 s1 = argv[test_retry_arg++];
4338 /* If the first argument contains no @ and no . it might be a local user
4339 or it might be a single-component name. Treat as a domain. */
4341 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4343 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4344 "being \ntreated as a one-component domain, not as a local part.\n\n",
4348 /* There may be an optional second domain arg. */
4350 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4351 s2 = argv[test_retry_arg++];
4353 /* The final arg is an error name */
4355 if (test_retry_arg < argc)
4357 uschar *ss = argv[test_retry_arg];
4359 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4362 printf("%s\n", CS error);
4363 return EXIT_FAILURE;
4366 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4367 code > 100 as an error is for matching codes to the decade. Turn them into
4368 a real error code, off the decade. */
4370 if (basic_errno == ERRNO_MAIL4XX ||
4371 basic_errno == ERRNO_RCPT4XX ||
4372 basic_errno == ERRNO_DATA4XX)
4374 int code = (more_errno >> 8) & 255;
4376 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4377 else if (code > 100)
4378 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4382 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4383 if (yield == NULL) printf("No retry information found\n"); else
4386 more_errno = yield->more_errno;
4387 printf("Retry rule: %s ", yield->pattern);
4389 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4391 printf("quota%s%s ",
4392 (more_errno > 0)? "_" : "",
4393 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4395 else if (yield->basic_errno == ECONNREFUSED)
4397 printf("refused%s%s ",
4398 (more_errno > 0)? "_" : "",
4399 (more_errno == 'M')? "MX" :
4400 (more_errno == 'A')? "A" : "");
4402 else if (yield->basic_errno == ETIMEDOUT)
4405 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4407 if (more_errno != 0) printf("_%s",
4408 (more_errno == 'M')? "MX" : "A");
4411 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4412 printf("auth_failed ");
4415 for (r = yield->rules; r != NULL; r = r->next)
4417 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4418 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4424 printf(",%d.", x/1000);
4438 exim_exit(EXIT_SUCCESS);
4441 /* Handle a request to list one or more configuration options */
4442 /* If -n was set, we suppress some information */
4446 set_process_info("listing variables");
4447 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4448 else for (i = recipients_arg; i < argc; i++)
4451 (Ustrcmp(argv[i], "router") == 0 ||
4452 Ustrcmp(argv[i], "transport") == 0 ||
4453 Ustrcmp(argv[i], "authenticator") == 0 ||
4454 Ustrcmp(argv[i], "macro") == 0))
4456 readconf_print(argv[i+1], argv[i], flag_n);
4459 else readconf_print(argv[i], NULL, flag_n);
4461 exim_exit(EXIT_SUCCESS);
4465 /* Handle a request to deliver one or more messages that are already on the
4466 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4467 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4469 Delivery of specific messages is typically used for a small number when
4470 prodding by hand (when the option forced_delivery will be set) or when
4471 re-execing to regain root privilege. Each message delivery must happen in a
4472 separate process, so we fork a process for each one, and run them sequentially
4473 so that debugging output doesn't get intertwined, and to avoid spawning too
4474 many processes if a long list is given. However, don't fork for the last one;
4475 this saves a process in the common case when Exim is called to deliver just one
4478 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4480 if (prod_requires_admin && !admin_user)
4482 fprintf(stderr, "exim: Permission denied\n");
4483 exim_exit(EXIT_FAILURE);
4485 set_process_info("delivering specified messages");
4486 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4487 for (i = msg_action_arg; i < argc; i++)
4492 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4493 else if ((pid = fork()) == 0)
4495 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4496 _exit(EXIT_SUCCESS);
4500 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4502 exim_exit(EXIT_FAILURE);
4506 exim_exit(EXIT_SUCCESS);
4510 /* If only a single queue run is requested, without SMTP listening, we can just
4511 turn into a queue runner, with an optional starting message id. */
4513 if (queue_interval == 0 && !daemon_listen)
4515 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4516 (start_queue_run_id == NULL)? US"" : US" starting at ",
4517 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4518 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4519 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4520 set_process_info("running the queue (single queue run)");
4521 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4522 exim_exit(EXIT_SUCCESS);
4526 /* Find the login name of the real user running this process. This is always
4527 needed when receiving a message, because it is written into the spool file. It
4528 may also be used to construct a from: or a sender: header, and in this case we
4529 need the user's full name as well, so save a copy of it, checked for RFC822
4530 syntax and munged if necessary, if it hasn't previously been set by the -F
4531 argument. We may try to get the passwd entry more than once, in case NIS or
4532 other delays are in evidence. Save the home directory for use in filter testing
4537 if ((pw = getpwuid(real_uid)) != NULL)
4539 originator_login = string_copy(US pw->pw_name);
4540 originator_home = string_copy(US pw->pw_dir);
4542 /* If user name has not been set by -F, set it from the passwd entry
4543 unless -f has been used to set the sender address by a trusted user. */
4545 if (originator_name == NULL)
4547 if (sender_address == NULL ||
4548 (!trusted_caller && filter_test == FTEST_NONE))
4550 uschar *name = US pw->pw_gecos;
4551 uschar *amp = Ustrchr(name, '&');
4554 /* Most Unix specify that a '&' character in the gecos field is
4555 replaced by a copy of the login name, and some even specify that
4556 the first character should be upper cased, so that's what we do. */
4561 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4562 amp - name, name, &loffset, originator_login, amp + 1);
4563 buffer[loffset] = toupper(buffer[loffset]);
4567 /* If a pattern for matching the gecos field was supplied, apply
4568 it and then expand the name string. */
4570 if (gecos_pattern != NULL && gecos_name != NULL)
4573 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4575 if (regex_match_and_setup(re, name, 0, -1))
4577 uschar *new_name = expand_string(gecos_name);
4579 if (new_name != NULL)
4581 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4582 "gecos field \"%s\"\n", new_name, name);
4585 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4586 "\"%s\": %s\n", gecos_name, expand_string_message);
4588 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4589 "gecos field \"%s\"\n", gecos_pattern, name);
4590 store_free((void *)re);
4592 originator_name = string_copy(name);
4595 /* A trusted caller has used -f but not -F */
4597 else originator_name = US"";
4600 /* Break the retry loop */
4605 if (++i > finduser_retries) break;
4609 /* If we cannot get a user login, log the incident and give up, unless the
4610 configuration specifies something to use. When running in the test harness,
4611 any setting of unknown_login overrides the actual name. */
4613 if (originator_login == NULL || running_in_test_harness)
4615 if (unknown_login != NULL)
4617 originator_login = expand_string(unknown_login);
4618 if (originator_name == NULL && unknown_username != NULL)
4619 originator_name = expand_string(unknown_username);
4620 if (originator_name == NULL) originator_name = US"";
4622 if (originator_login == NULL)
4623 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4627 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4630 originator_name = string_copy(parse_fix_phrase(originator_name,
4631 Ustrlen(originator_name), big_buffer, big_buffer_size));
4633 /* If a message is created by this call of Exim, the uid/gid of its originator
4634 are those of the caller. These values are overridden if an existing message is
4635 read in from the spool. */
4637 originator_uid = real_uid;
4638 originator_gid = real_gid;
4640 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4641 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4643 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4644 returns. We leave this till here so that the originator_ fields are available
4645 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4648 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4652 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4653 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4654 "mua_wrapper is set");
4659 /* If the sender ident has not been set (by a trusted caller) set it to
4660 the caller. This will get overwritten below for an inetd call. If a trusted
4661 caller has set it empty, unset it. */
4663 if (sender_ident == NULL) sender_ident = originator_login;
4664 else if (sender_ident[0] == 0) sender_ident = NULL;
4666 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4667 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4668 originator_* variables set. */
4670 if (test_rewrite_arg >= 0)
4672 really_exim = FALSE;
4673 if (test_rewrite_arg >= argc)
4675 printf("-brw needs an address argument\n");
4676 exim_exit(EXIT_FAILURE);
4678 rewrite_test(argv[test_rewrite_arg]);
4679 exim_exit(EXIT_SUCCESS);
4682 /* A locally-supplied message is considered to be coming from a local user
4683 unless a trusted caller supplies a sender address with -f, or is passing in the
4684 message via SMTP (inetd invocation or otherwise). */
4686 if ((sender_address == NULL && !smtp_input) ||
4687 (!trusted_caller && filter_test == FTEST_NONE))
4689 sender_local = TRUE;
4691 /* A trusted caller can supply authenticated_sender and authenticated_id
4692 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4693 defaults except when host checking. */
4695 if (authenticated_sender == NULL && !host_checking)
4696 authenticated_sender = string_sprintf("%s@%s", originator_login,
4697 qualify_domain_sender);
4698 if (authenticated_id == NULL && !host_checking)
4699 authenticated_id = originator_login;
4702 /* Trusted callers are always permitted to specify the sender address.
4703 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4704 is specified is the empty address. However, if a trusted caller does not
4705 specify a sender address for SMTP input, we leave sender_address unset. This
4706 causes the MAIL commands to be honoured. */
4708 if ((!smtp_input && sender_address == NULL) ||
4709 !receive_check_set_sender(sender_address))
4711 /* Either the caller is not permitted to set a general sender, or this is
4712 non-SMTP input and the trusted caller has not set a sender. If there is no
4713 sender, or if a sender other than <> is set, override with the originator's
4714 login (which will get qualified below), except when checking things. */
4716 if (sender_address == NULL /* No sender_address set */
4718 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4719 !checking && /* Not running tests, AND */
4720 filter_test == FTEST_NONE)) /* Not testing a filter */
4722 sender_address = originator_login;
4723 sender_address_forced = FALSE;
4724 sender_address_domain = 0;
4728 /* Remember whether an untrusted caller set the sender address */
4730 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4732 /* Ensure that the sender address is fully qualified unless it is the empty
4733 address, which indicates an error message, or doesn't exist (root caller, smtp
4734 interface, no -f argument). */
4736 if (sender_address != NULL && sender_address[0] != 0 &&
4737 sender_address_domain == 0)
4738 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4739 qualify_domain_sender);
4741 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4743 /* Handle a request to verify a list of addresses, or test them for delivery.
4744 This must follow the setting of the sender address, since routers can be
4745 predicated upon the sender. If no arguments are given, read addresses from
4746 stdin. Set debug_level to at least D_v to get full output for address testing.
4749 if (verify_address_mode || address_test_mode)
4752 int flags = vopt_qualify;
4754 if (verify_address_mode)
4756 if (!verify_as_sender) flags |= vopt_is_recipient;
4757 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4762 flags |= vopt_is_recipient;
4763 debug_selector |= D_v;
4764 debug_file = stderr;
4765 debug_fd = fileno(debug_file);
4766 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4769 if (recipients_arg < argc)
4771 while (recipients_arg < argc)
4773 uschar *s = argv[recipients_arg++];
4776 BOOL finished = FALSE;
4777 uschar *ss = parse_find_address_end(s, FALSE);
4778 if (*ss == ',') *ss = 0; else finished = TRUE;
4779 test_address(s, flags, &exit_value);
4782 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4789 uschar *s = get_stdinput(NULL, NULL);
4790 if (s == NULL) break;
4791 test_address(s, flags, &exit_value);
4795 exim_exit(exit_value);
4798 /* Handle expansion checking. Either expand items on the command line, or read
4799 from stdin if there aren't any. If -Mset was specified, load the message so
4800 that its variables can be used, but restrict this facility to admin users.
4801 Otherwise, if -bem was used, read a message from stdin. */
4805 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4807 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4810 fprintf(stderr, "exim: permission denied\n");
4813 message_id = argv[msg_action_arg];
4814 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4815 if (!spool_open_datafile(message_id))
4816 printf ("Failed to load message datafile %s\n", message_id);
4817 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4818 printf ("Failed to load message %s\n", message_id);
4821 /* Read a test message from a file. We fudge it up to be on stdin, saving
4822 stdin itself for later reading of expansion strings. */
4824 else if (expansion_test_message != NULL)
4826 int save_stdin = dup(0);
4827 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4830 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4832 return EXIT_FAILURE;
4835 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4836 message_ended = END_NOTENDED;
4837 read_message_body(receive_msg(extract_recipients));
4838 message_linecount += body_linecount;
4839 (void)dup2(save_stdin, 0);
4840 (void)close(save_stdin);
4841 clearerr(stdin); /* Required by Darwin */
4844 /* Allow $recipients for this testing */
4846 enable_dollar_recipients = TRUE;
4848 /* Expand command line items */
4850 if (recipients_arg < argc)
4852 while (recipients_arg < argc)
4854 uschar *s = argv[recipients_arg++];
4855 uschar *ss = expand_string(s);
4856 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4857 else printf("%s\n", CS ss);
4865 char *(*fn_readline)(const char *) = NULL;
4866 void (*fn_addhist)(const char *) = NULL;
4869 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4875 uschar *source = get_stdinput(fn_readline, fn_addhist);
4876 if (source == NULL) break;
4877 ss = expand_string(source);
4879 printf ("Failed: %s\n", expand_string_message);
4880 else printf("%s\n", CS ss);
4884 if (dlhandle != NULL) dlclose(dlhandle);
4888 /* The data file will be open after -Mset */
4890 if (deliver_datafile >= 0)
4892 (void)close(deliver_datafile);
4893 deliver_datafile = -1;
4896 exim_exit(EXIT_SUCCESS);
4900 /* The active host name is normally the primary host name, but it can be varied
4901 for hosts that want to play several parts at once. We need to ensure that it is
4902 set for host checking, and for receiving messages. */
4904 smtp_active_hostname = primary_hostname;
4905 if (raw_active_hostname != NULL)
4907 uschar *nah = expand_string(raw_active_hostname);
4910 if (!expand_string_forcedfail)
4911 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4912 "(smtp_active_hostname): %s", raw_active_hostname,
4913 expand_string_message);
4915 else if (nah[0] != 0) smtp_active_hostname = nah;
4918 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4919 given IP address so that the blocking and relay configuration can be tested.
4920 Unless a sender_ident was set by -oMt, we discard it (the default is the
4921 caller's login name). An RFC 1413 call is made only if we are running in the
4922 test harness and an incoming interface and both ports are specified, because
4923 there is no TCP/IP call to find the ident for. */
4930 if (!sender_ident_set)
4932 sender_ident = NULL;
4933 if (running_in_test_harness && sender_host_port != 0 &&
4934 interface_address != NULL && interface_port != 0)
4935 verify_get_ident(1413);
4938 /* In case the given address is a non-canonical IPv6 address, canonicize
4939 it. The code works for both IPv4 and IPv6, as it happens. */
4941 size = host_aton(sender_host_address, x);
4942 sender_host_address = store_get(48); /* large enough for full IPv6 */
4943 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4945 /* Now set up for testing */
4947 host_build_sender_fullhost();
4951 sender_local = FALSE;
4952 sender_host_notsocket = TRUE;
4953 debug_file = stderr;
4954 debug_fd = fileno(debug_file);
4955 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4956 "**** but without any ident (RFC 1413) callback.\n"
4957 "**** This is not for real!\n\n",
4958 sender_host_address);
4960 if (verify_check_host(&hosts_connection_nolog) == OK)
4961 log_write_selector &= ~L_smtp_connection;
4962 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4964 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4965 because a log line has already been written for all its failure exists
4966 (usually "connection refused: <reason>") and writing another one is
4967 unnecessary clutter. */
4969 if (smtp_start_session())
4971 reset_point = store_get(0);
4974 store_reset(reset_point);
4975 if (smtp_setup_msg() <= 0) break;
4976 if (!receive_msg(FALSE)) break;
4980 exim_exit(EXIT_SUCCESS);
4984 /* Arrange for message reception if recipients or SMTP were specified;
4985 otherwise complain unless a version print (-bV) happened or this is a filter
4986 verification test or info dump.
4987 In the former case, show the configuration file name. */
4989 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4991 if (version_printed)
4993 printf("Configuration file is %s\n", config_main_filename);
4994 return EXIT_SUCCESS;
4997 if (info_flag != CMDINFO_NONE)
4999 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5000 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5003 if (filter_test == FTEST_NONE)
5004 exim_usage(called_as);
5008 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5009 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5010 that we are not called from inetd, because that is rejected above. The
5011 following configuration settings are forced here:
5013 (1) Synchronous delivery (-odi)
5014 (2) Errors to stderr (-oep == -oeq)
5015 (3) No parallel remote delivery
5016 (4) Unprivileged delivery
5018 We don't force overall queueing options because there are several of them;
5019 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5020 to override any SMTP queueing. */
5024 synchronous_delivery = TRUE;
5025 arg_error_handling = ERRORS_STDERR;
5026 remote_max_parallel = 1;
5027 deliver_drop_privilege = TRUE;
5029 queue_smtp_domains = NULL;
5033 /* Prepare to accept one or more new messages on the standard input. When a
5034 message has been read, its id is returned in message_id[]. If doing immediate
5035 delivery, we fork a delivery process for each received message, except for the
5036 last one, where we can save a process switch.
5038 It is only in non-smtp mode that error_handling is allowed to be changed from
5039 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5040 sendmail error modes other than -oem ever actually used? Later: yes.) */
5042 if (!smtp_input) error_handling = arg_error_handling;
5044 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5045 logging being sent down the socket and make an identd call to get the
5050 (void)fclose(stderr);
5051 exim_nullstd(); /* Re-open to /dev/null */
5052 verify_get_ident(IDENT_PORT);
5053 host_build_sender_fullhost();
5054 set_process_info("handling incoming connection from %s via inetd",
5058 /* If the sender host address has been set, build sender_fullhost if it hasn't
5059 already been done (which it will have been for inetd). This caters for the
5060 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5061 so that the test for IP options is skipped for -bs input. */
5063 if (sender_host_address != NULL && sender_fullhost == NULL)
5065 host_build_sender_fullhost();
5066 set_process_info("handling incoming connection from %s via -oMa",
5068 sender_host_notsocket = TRUE;
5071 /* Otherwise, set the sender host as unknown except for inetd calls. This
5072 prevents host checking in the case of -bs not from inetd and also for -bS. */
5074 else if (!is_inetd) sender_host_unknown = TRUE;
5076 /* If stdout does not exist, then dup stdin to stdout. This can happen
5077 if exim is started from inetd. In this case fd 0 will be set to the socket,
5078 but fd 1 will not be set. This also happens for passed SMTP channels. */
5080 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5082 /* Set up the incoming protocol name and the state of the program. Root is
5083 allowed to force received protocol via the -oMr option above. If we have come
5084 via inetd, the process info has already been set up. We don't set
5085 received_protocol here for smtp input, as it varies according to
5086 batch/HELO/EHLO/AUTH/TLS. */
5090 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5091 smtp_batched_input? "batched " : "",
5092 (sender_address!= NULL)? sender_address : originator_login);
5096 if (received_protocol == NULL)
5097 received_protocol = string_sprintf("local%s", called_as);
5098 set_process_info("accepting a local non-SMTP message from <%s>",
5102 /* Initialize the session_local_queue-only flag (this will be ignored if
5103 mua_wrapper is set) */
5106 session_local_queue_only = queue_only;
5108 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5109 the spool if so configured. On failure, we must not attempt to send an error
5110 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5111 error code is given.) */
5113 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5115 fprintf(stderr, "exim: insufficient disk space\n");
5116 return EXIT_FAILURE;
5119 /* If this is smtp input of any kind, real or batched, handle the start of the
5122 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5123 because a log line has already been written for all its failure exists
5124 (usually "connection refused: <reason>") and writing another one is
5125 unnecessary clutter. */
5131 if (verify_check_host(&hosts_connection_nolog) == OK)
5132 log_write_selector &= ~L_smtp_connection;
5133 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5134 if (!smtp_start_session())
5137 exim_exit(EXIT_SUCCESS);
5141 /* Otherwise, set up the input size limit here. */
5145 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5146 if (expand_string_message != NULL)
5148 if (thismessage_size_limit == -1)
5149 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5150 "message_size_limit: %s", expand_string_message);
5152 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5153 "message_size_limit: %s", expand_string_message);
5157 /* Loop for several messages when reading SMTP input. If we fork any child
5158 processes, we don't want to wait for them unless synchronous delivery is
5159 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5160 same as SIG_DFL, despite the fact that documentation often lists the default as
5161 "ignore". This is a confusing area. This is what I know:
5163 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5164 processes that complete simply to go away without ever becoming defunct. You
5165 can't then wait for them - but we don't want to wait for them in the
5166 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5167 happen for all OS (e.g. *BSD is different).
5169 But that's not the end of the story. Some (many? all?) systems have the
5170 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5171 has by default, so it seems that the difference is merely one of default
5172 (compare restarting vs non-restarting signals).
5174 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5175 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5176 of the loop below. Paranoia rules.
5178 February 2003: That's *still* not the end of the story. There are now versions
5179 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5180 process then calls waitpid(), a grumble is written to the system log, because
5181 this is logically inconsistent. In other words, it doesn't like the paranoia.
5182 As a consequenc of this, the waitpid() below is now excluded if we are sure
5183 that SIG_IGN works. */
5185 if (!synchronous_delivery)
5188 struct sigaction act;
5189 act.sa_handler = SIG_IGN;
5190 sigemptyset(&(act.sa_mask));
5191 act.sa_flags = SA_NOCLDWAIT;
5192 sigaction(SIGCHLD, &act, NULL);
5194 signal(SIGCHLD, SIG_IGN);
5198 /* Save the current store pool point, for resetting at the start of
5199 each message, and save the real sender address, if any. */
5201 reset_point = store_get(0);
5202 real_sender_address = sender_address;
5204 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5205 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5210 store_reset(reset_point);
5213 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5214 input and build the recipients list, before calling receive_msg() to read the
5215 message proper. Whatever sender address is given in the SMTP transaction is
5216 often ignored for local senders - we use the actual sender, which is normally
5217 either the underlying user running this process or a -f argument provided by
5218 a trusted caller. It is saved in real_sender_address. The test for whether to
5219 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5224 if ((rc = smtp_setup_msg()) > 0)
5226 if (real_sender_address != NULL &&
5227 !receive_check_set_sender(sender_address))
5229 sender_address = raw_sender = real_sender_address;
5230 sender_address_unrewritten = NULL;
5233 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5234 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5235 the very end. The result of the ACL is ignored (as for other non-SMTP
5236 messages). It is run for its potential side effects. */
5238 if (smtp_batched_input && acl_not_smtp_start != NULL)
5240 uschar *user_msg, *log_msg;
5241 enable_dollar_recipients = TRUE;
5242 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5243 &user_msg, &log_msg);
5244 enable_dollar_recipients = FALSE;
5247 /* Now get the data for the message */
5249 more = receive_msg(extract_recipients);
5250 if (message_id[0] == 0)
5253 smtp_log_no_mail(); /* Log no mail if configured */
5254 exim_exit(EXIT_FAILURE);
5259 smtp_log_no_mail(); /* Log no mail if configured */
5260 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5264 /* In the non-SMTP case, we have all the information from the command
5265 line, but must process it in case it is in the more general RFC822
5266 format, and in any case, to detect syntax errors. Also, it appears that
5267 the use of comma-separated lists as single arguments is common, so we
5268 had better support them. */
5274 int count = argc - recipients_arg;
5275 uschar **list = argv + recipients_arg;
5277 /* These options cannot be changed dynamically for non-SMTP messages */
5279 active_local_sender_retain = local_sender_retain;
5280 active_local_from_check = local_from_check;
5282 /* Save before any rewriting */
5284 raw_sender = string_copy(sender_address);
5286 /* Loop for each argument */
5288 for (i = 0; i < count; i++)
5290 int start, end, domain;
5292 uschar *s = list[i];
5294 /* Loop for each comma-separated address */
5298 BOOL finished = FALSE;
5300 uschar *ss = parse_find_address_end(s, FALSE);
5302 if (*ss == ',') *ss = 0; else finished = TRUE;
5304 /* Check max recipients - if -t was used, these aren't recipients */
5306 if (recipients_max > 0 && ++rcount > recipients_max &&
5307 !extract_recipients)
5309 if (error_handling == ERRORS_STDERR)
5311 fprintf(stderr, "exim: too many recipients\n");
5312 exim_exit(EXIT_FAILURE);
5317 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5318 errors_sender_rc : EXIT_FAILURE;
5323 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5325 if (domain == 0 && !allow_unqualified_recipient)
5328 errmess = US"unqualified recipient address not allowed";
5331 if (recipient == NULL)
5333 if (error_handling == ERRORS_STDERR)
5335 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5336 string_printing(list[i]), errmess);
5337 exim_exit(EXIT_FAILURE);
5343 eblock.text1 = string_printing(list[i]);
5344 eblock.text2 = errmess;
5346 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5347 errors_sender_rc : EXIT_FAILURE;
5351 receive_add_recipient(recipient, -1);
5354 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5358 /* Show the recipients when debugging */
5363 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5364 if (recipients_list != NULL)
5366 debug_printf("Recipients:\n");
5367 for (i = 0; i < recipients_count; i++)
5368 debug_printf(" %s\n", recipients_list[i].address);
5372 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5373 ignored; rejecting here would just add complication, and it can just as
5374 well be done later. Allow $recipients to be visible in the ACL. */
5376 if (acl_not_smtp_start != NULL)
5378 uschar *user_msg, *log_msg;
5379 enable_dollar_recipients = TRUE;
5380 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5381 &user_msg, &log_msg);
5382 enable_dollar_recipients = FALSE;
5385 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5386 will just read the headers for the message, and not write anything onto the
5389 message_ended = END_NOTENDED;
5390 more = receive_msg(extract_recipients);
5392 /* more is always FALSE here (not SMTP message) when reading a message
5393 for real; when reading the headers of a message for filter testing,
5394 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5396 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5397 } /* Non-SMTP message reception */
5399 /* If this is a filter testing run, there are headers in store, but
5400 no message on the spool. Run the filtering code in testing mode, setting
5401 the domain to the qualify domain and the local part to the current user,
5402 unless they have been set by options. The prefix and suffix are left unset
5403 unless specified. The the return path is set to to the sender unless it has
5404 already been set from a return-path header in the message. */
5406 if (filter_test != FTEST_NONE)
5408 deliver_domain = (ftest_domain != NULL)?
5409 ftest_domain : qualify_domain_recipient;
5410 deliver_domain_orig = deliver_domain;
5411 deliver_localpart = (ftest_localpart != NULL)?
5412 ftest_localpart : originator_login;
5413 deliver_localpart_orig = deliver_localpart;
5414 deliver_localpart_prefix = ftest_prefix;
5415 deliver_localpart_suffix = ftest_suffix;
5416 deliver_home = originator_home;
5418 if (return_path == NULL)
5420 printf("Return-path copied from sender\n");
5421 return_path = string_copy(sender_address);
5425 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5427 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5429 receive_add_recipient(
5430 string_sprintf("%s%s%s@%s",
5431 (ftest_prefix == NULL)? US"" : ftest_prefix,
5433 (ftest_suffix == NULL)? US"" : ftest_suffix,
5434 deliver_domain), -1);
5436 printf("Recipient = %s\n", recipients_list[0].address);
5437 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5438 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5440 if (chdir("/")) /* Get away from wherever the user is running this from */
5442 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5443 exim_exit(EXIT_FAILURE);
5446 /* Now we run either a system filter test, or a user filter test, or both.
5447 In the latter case, headers added by the system filter will persist and be
5448 available to the user filter. We need to copy the filter variables
5451 if ((filter_test & FTEST_SYSTEM) != 0)
5453 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5454 exim_exit(EXIT_FAILURE);
5457 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5459 if ((filter_test & FTEST_USER) != 0)
5461 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5462 exim_exit(EXIT_FAILURE);
5465 exim_exit(EXIT_SUCCESS);
5468 /* Else act on the result of message reception. We should not get here unless
5469 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5470 will be TRUE. If it is not, check on the number of messages received in this
5473 if (!session_local_queue_only &&
5474 smtp_accept_queue_per_connection > 0 &&
5475 receive_messagecount > smtp_accept_queue_per_connection)
5477 session_local_queue_only = TRUE;
5478 queue_only_reason = 2;
5481 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5482 and queue_only_load is set, check that the load average is below it. If it is
5483 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5484 default), we put the whole session into queue_only mode. It then remains this
5485 way for any subsequent messages on the same SMTP connection. This is a
5486 deliberate choice; even though the load average may fall, it doesn't seem
5487 right to deliver later messages on the same call when not delivering earlier
5488 ones. However, there are odd cases where this is not wanted, so this can be
5489 changed by setting queue_only_load_latch false. */
5491 local_queue_only = session_local_queue_only;
5492 if (!local_queue_only && queue_only_load >= 0)
5494 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5495 if (local_queue_only)
5497 queue_only_reason = 3;
5498 if (queue_only_load_latch) session_local_queue_only = TRUE;
5502 /* If running as an MUA wrapper, all queueing options and freezing options
5506 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5508 /* Log the queueing here, when it will get a message id attached, but
5509 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5512 if (local_queue_only) switch(queue_only_reason)
5515 log_write(L_delay_delivery,
5516 LOG_MAIN, "no immediate delivery: more than %d messages "
5517 "received in one connection", smtp_accept_queue_per_connection);
5521 log_write(L_delay_delivery,
5522 LOG_MAIN, "no immediate delivery: load average %.2f",
5523 (double)load_average/1000.0);
5527 /* Else do the delivery unless the ACL or local_scan() called for queue only
5528 or froze the message. Always deliver in a separate process. A fork failure is
5529 not a disaster, as the delivery will eventually happen on a subsequent queue
5530 run. The search cache must be tidied before the fork, as the parent will
5531 do it before exiting. The child will trigger a lookup failure and
5532 thereby defer the delivery if it tries to use (for example) a cached ldap
5533 connection that the parent has called unbind on. */
5535 else if (!queue_only_policy && !deliver_freeze)
5540 if ((pid = fork()) == 0)
5543 close_unwanted(); /* Close unwanted file descriptors and TLS */
5544 exim_nullstd(); /* Ensure std{in,out,err} exist */
5546 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5547 mode, deliver_drop_privilege is forced TRUE). */
5549 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5551 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5553 /* Control does not return here. */
5556 /* No need to re-exec */
5558 rc = deliver_message(message_id, FALSE, FALSE);
5560 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5561 EXIT_SUCCESS : EXIT_FAILURE);
5566 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5567 "process: %s", strerror(errno));
5570 /* In the parent, wait if synchronous delivery is required. This will
5571 always be the case in MUA wrapper mode. */
5573 else if (synchronous_delivery)
5576 while (wait(&status) != pid);
5577 if ((status & 0x00ff) != 0)
5578 log_write(0, LOG_MAIN|LOG_PANIC,
5579 "process %d crashed with signal %d while delivering %s",
5580 (int)pid, status & 0x00ff, message_id);
5581 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5585 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5586 automatically reaps children (see comments above the loop), clear away any
5587 finished subprocesses here, in case there are lots of messages coming in
5588 from the same source. */
5590 #ifndef SIG_IGN_WORKS
5591 while (waitpid(-1, NULL, WNOHANG) > 0);
5595 exim_exit(EXIT_SUCCESS); /* Never returns */
5596 return 0; /* To stop compiler warning */