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");
807 #ifdef EXPERIMENTAL_SPF
808 fprintf(f, " Experimental_SPF");
810 #ifdef EXPERIMENTAL_SRS
811 fprintf(f, " Experimental_SRS");
813 #ifdef EXPERIMENTAL_BRIGHTMAIL
814 fprintf(f, " Experimental_Brightmail");
816 #ifdef EXPERIMENTAL_DCC
817 fprintf(f, " Experimental_DCC");
819 #ifdef EXPERIMENTAL_DMARC
820 fprintf(f, " Experimental_DMARC");
822 #ifdef EXPERIMENTAL_OCSP
823 fprintf(f, " Experimental_OCSP");
825 #ifdef EXPERIMENTAL_PRDR
826 fprintf(f, " Experimental_PRDR");
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");
839 fprintf(f, "Lookups (built-in):");
840 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
841 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
843 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
846 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
847 fprintf(f, " dbm dbmjz dbmnz");
849 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
850 fprintf(f, " dnsdb");
852 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
853 fprintf(f, " dsearch");
855 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
856 fprintf(f, " ibase");
858 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
859 fprintf(f, " ldap ldapdn ldapm");
861 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
862 fprintf(f, " mysql");
864 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
865 fprintf(f, " nis nis0");
867 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
868 fprintf(f, " nisplus");
870 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
871 fprintf(f, " oracle");
873 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
874 fprintf(f, " passwd");
876 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
877 fprintf(f, " pgsql");
879 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
880 fprintf(f, " sqlite");
882 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
883 fprintf(f, " testdb");
885 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
886 fprintf(f, " whoson");
890 fprintf(f, "Authenticators:");
892 fprintf(f, " cram_md5");
894 #ifdef AUTH_CYRUS_SASL
895 fprintf(f, " cyrus_sasl");
898 fprintf(f, " dovecot");
901 fprintf(f, " gsasl");
903 #ifdef AUTH_HEIMDAL_GSSAPI
904 fprintf(f, " heimdal_gssapi");
906 #ifdef AUTH_PLAINTEXT
907 fprintf(f, " plaintext");
914 fprintf(f, "Routers:");
916 fprintf(f, " accept");
918 #ifdef ROUTER_DNSLOOKUP
919 fprintf(f, " dnslookup");
921 #ifdef ROUTER_IPLITERAL
922 fprintf(f, " ipliteral");
924 #ifdef ROUTER_IPLOOKUP
925 fprintf(f, " iplookup");
927 #ifdef ROUTER_MANUALROUTE
928 fprintf(f, " manualroute");
930 #ifdef ROUTER_QUERYPROGRAM
931 fprintf(f, " queryprogram");
933 #ifdef ROUTER_REDIRECT
934 fprintf(f, " redirect");
938 fprintf(f, "Transports:");
939 #ifdef TRANSPORT_APPENDFILE
940 fprintf(f, " appendfile");
941 #ifdef SUPPORT_MAILDIR
942 fprintf(f, "/maildir");
944 #ifdef SUPPORT_MAILSTORE
945 fprintf(f, "/mailstore");
951 #ifdef TRANSPORT_AUTOREPLY
952 fprintf(f, " autoreply");
954 #ifdef TRANSPORT_LMTP
957 #ifdef TRANSPORT_PIPE
960 #ifdef TRANSPORT_SMTP
965 if (fixed_never_users[0] > 0)
968 fprintf(f, "Fixed never_users: ");
969 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
970 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
971 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
974 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
976 /* Everything else is details which are only worth reporting when debugging.
977 Perhaps the tls_version_report should move into this too. */
982 /* clang defines __GNUC__ (at least, for me) so test for it first */
983 #if defined(__clang__)
984 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
985 #elif defined(__GNUC__)
986 fprintf(f, "Compiler: GCC [%s]\n",
990 "? unknown version ?"
994 fprintf(f, "Compiler: <unknown>\n");
998 tls_version_report(f);
1001 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1002 if (authi->version_report) {
1003 (*authi->version_report)(f);
1007 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1008 characters; unless it's an ancient version of PCRE in which case it
1010 #ifndef PCRE_PRERELEASE
1011 #define PCRE_PRERELEASE
1014 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1015 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1017 PCRE_MAJOR, PCRE_MINOR,
1018 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1021 #undef EXPAND_AND_QUOTE
1024 for (i = 0; i < lookup_list_count; i++)
1026 if (lookup_list[i]->version_report)
1027 lookup_list[i]->version_report(f);
1030 #ifdef WHITELIST_D_MACROS
1031 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1033 fprintf(f, "WHITELIST_D_MACROS unset\n");
1035 #ifdef TRUSTED_CONFIG_LIST
1036 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1038 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1045 /*************************************************
1046 * Show auxiliary information about Exim *
1047 *************************************************/
1050 show_exim_information(enum commandline_info request, FILE *stream)
1057 fprintf(stream, "Oops, something went wrong.\n");
1061 "The -bI: flag takes a string indicating which information to provide.\n"
1062 "If the string is not recognised, you'll get this help (on stderr).\n"
1064 " exim -bI:help this information\n"
1065 " exim -bI:dscp dscp value keywords known\n"
1066 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1070 for (pp = exim_sieve_extension_list; *pp; ++pp)
1071 fprintf(stream, "%s\n", *pp);
1074 dscp_list_to_stream(stream);
1080 /*************************************************
1081 * Quote a local part *
1082 *************************************************/
1084 /* This function is used when a sender address or a From: or Sender: header
1085 line is being created from the caller's login, or from an authenticated_id. It
1086 applies appropriate quoting rules for a local part.
1088 Argument: the local part
1089 Returns: the local part, quoted if necessary
1093 local_part_quote(uschar *lpart)
1095 BOOL needs_quote = FALSE;
1100 for (t = lpart; !needs_quote && *t != 0; t++)
1102 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1103 (*t != '.' || t == lpart || t[1] == 0);
1106 if (!needs_quote) return lpart;
1109 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1113 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1116 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1119 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1120 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1121 yield = string_cat(yield, &size, &ptr, nq, 1);
1125 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1133 /*************************************************
1134 * Load readline() functions *
1135 *************************************************/
1137 /* This function is called from testing executions that read data from stdin,
1138 but only when running as the calling user. Currently, only -be does this. The
1139 function loads the readline() function library and passes back the functions.
1140 On some systems, it needs the curses library, so load that too, but try without
1141 it if loading fails. All this functionality has to be requested at build time.
1144 fn_readline_ptr pointer to where to put the readline pointer
1145 fn_addhist_ptr pointer to where to put the addhistory function
1147 Returns: the dlopen handle or NULL on failure
1151 set_readline(char * (**fn_readline_ptr)(const char *),
1152 void (**fn_addhist_ptr)(const char *))
1155 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1157 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1158 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1160 if (dlhandle != NULL)
1162 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1163 * char * readline (const char *prompt);
1164 * void add_history (const char *string);
1166 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1167 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1171 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1180 /*************************************************
1181 * Get a line from stdin for testing things *
1182 *************************************************/
1184 /* This function is called when running tests that can take a number of lines
1185 of input (for example, -be and -bt). It handles continuations and trailing
1186 spaces. And prompting and a blank line output on eof. If readline() is in use,
1187 the arguments are non-NULL and provide the relevant functions.
1190 fn_readline readline function or NULL
1191 fn_addhist addhist function or NULL
1193 Returns: pointer to dynamic memory, or NULL at end of file
1197 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1202 uschar *yield = NULL;
1204 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1208 uschar buffer[1024];
1212 char *readline_line = NULL;
1213 if (fn_readline != NULL)
1215 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1216 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1217 p = US readline_line;
1222 /* readline() not in use */
1225 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1229 /* Handle the line */
1231 ss = p + (int)Ustrlen(p);
1232 while (ss > p && isspace(ss[-1])) ss--;
1236 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1239 yield = string_cat(yield, &size, &ptr, p, ss - p);
1242 if (fn_readline != NULL) free(readline_line);
1245 if (ss == p || yield[ptr-1] != '\\')
1253 if (yield == NULL) printf("\n");
1259 /*************************************************
1260 * Output usage information for the program *
1261 *************************************************/
1263 /* This function is called when there are no recipients
1264 or a specific --help argument was added.
1267 progname information on what name we were called by
1269 Returns: DOES NOT RETURN
1273 exim_usage(uschar *progname)
1276 /* Handle specific program invocation varients */
1277 if (Ustrcmp(progname, US"-mailq") == 0)
1280 "mailq - list the contents of the mail queue\n\n"
1281 "For a list of options, see the Exim documentation.\n");
1285 /* Generic usage - we output this whatever happens */
1287 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1288 "not directly from a shell command line. Options and/or arguments control\n"
1289 "what it does when called. For a list of options, see the Exim documentation.\n");
1296 /*************************************************
1297 * Validate that the macros given are okay *
1298 *************************************************/
1300 /* Typically, Exim will drop privileges if macros are supplied. In some
1301 cases, we want to not do so.
1303 Arguments: none (macros is a global)
1304 Returns: true if trusted, false otherwise
1308 macros_trusted(void)
1310 #ifdef WHITELIST_D_MACROS
1312 uschar *whitelisted, *end, *p, **whites, **w;
1313 int white_count, i, n;
1315 BOOL prev_char_item, found;
1320 #ifndef WHITELIST_D_MACROS
1324 /* We only trust -D overrides for some invoking users:
1325 root, the exim run-time user, the optional config owner user.
1326 I don't know why config-owner would be needed, but since they can own the
1327 config files anyway, there's no security risk to letting them override -D. */
1328 if ( ! ((real_uid == root_uid)
1329 || (real_uid == exim_uid)
1330 #ifdef CONFIGURE_OWNER
1331 || (real_uid == config_uid)
1335 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1339 /* Get a list of macros which are whitelisted */
1340 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1341 prev_char_item = FALSE;
1343 for (p = whitelisted; *p != '\0'; ++p)
1345 if (*p == ':' || isspace(*p))
1350 prev_char_item = FALSE;
1353 if (!prev_char_item)
1354 prev_char_item = TRUE;
1361 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1362 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1367 if (i == white_count)
1369 while (*p != '\0' && p < end)
1375 /* The list of macros should be very short. Accept the N*M complexity. */
1376 for (m = macros; m != NULL; m = m->next)
1379 for (w = whites; *w; ++w)
1380 if (Ustrcmp(*w, m->name) == 0)
1387 if (m->replacement == NULL)
1389 len = Ustrlen(m->replacement);
1392 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1393 0, PCRE_EOPT, NULL, 0);
1396 if (n != PCRE_ERROR_NOMATCH)
1397 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1401 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1407 /*************************************************
1408 * Entry point and high-level code *
1409 *************************************************/
1411 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1412 the appropriate action. All the necessary functions are present in the one
1413 binary. I originally thought one should split it up, but it turns out that so
1414 much of the apparatus is needed in each chunk that one might as well just have
1415 it all available all the time, which then makes the coding easier as well.
1418 argc count of entries in argv
1419 argv argument strings, with argv[0] being the program name
1421 Returns: EXIT_SUCCESS if terminated successfully
1422 EXIT_FAILURE otherwise, except when a message has been sent
1423 to the sender, and -oee was given
1427 main(int argc, char **cargv)
1429 uschar **argv = USS cargv;
1430 int arg_receive_timeout = -1;
1431 int arg_smtp_receive_timeout = -1;
1432 int arg_error_handling = error_handling;
1433 int filter_sfd = -1;
1434 int filter_ufd = -1;
1437 int list_queue_option = 0;
1439 int msg_action_arg = -1;
1440 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1441 int queue_only_reason = 0;
1443 int perl_start_option = 0;
1445 int recipients_arg = argc;
1446 int sender_address_domain = 0;
1447 int test_retry_arg = -1;
1448 int test_rewrite_arg = -1;
1449 BOOL arg_queue_only = FALSE;
1450 BOOL bi_option = FALSE;
1451 BOOL checking = FALSE;
1452 BOOL count_queue = FALSE;
1453 BOOL expansion_test = FALSE;
1454 BOOL extract_recipients = FALSE;
1455 BOOL flag_G = FALSE;
1456 BOOL flag_n = FALSE;
1457 BOOL forced_delivery = FALSE;
1458 BOOL f_end_dot = FALSE;
1459 BOOL deliver_give_up = FALSE;
1460 BOOL list_queue = FALSE;
1461 BOOL list_options = FALSE;
1462 BOOL local_queue_only;
1464 BOOL one_msg_action = FALSE;
1465 BOOL queue_only_set = FALSE;
1466 BOOL receiving_message = TRUE;
1467 BOOL sender_ident_set = FALSE;
1468 BOOL session_local_queue_only;
1470 BOOL removed_privilege = FALSE;
1471 BOOL usage_wanted = FALSE;
1472 BOOL verify_address_mode = FALSE;
1473 BOOL verify_as_sender = FALSE;
1474 BOOL version_printed = FALSE;
1475 uschar *alias_arg = NULL;
1476 uschar *called_as = US"";
1477 uschar *cmdline_syslog_name = NULL;
1478 uschar *start_queue_run_id = NULL;
1479 uschar *stop_queue_run_id = NULL;
1480 uschar *expansion_test_message = NULL;
1481 uschar *ftest_domain = NULL;
1482 uschar *ftest_localpart = NULL;
1483 uschar *ftest_prefix = NULL;
1484 uschar *ftest_suffix = NULL;
1485 uschar *malware_test_file = NULL;
1486 uschar *real_sender_address;
1487 uschar *originator_home = US"/";
1492 struct stat statbuf;
1493 pid_t passed_qr_pid = (pid_t)0;
1494 int passed_qr_pipe = -1;
1495 gid_t group_list[NGROUPS_MAX];
1497 /* For the -bI: flag */
1498 enum commandline_info info_flag = CMDINFO_NONE;
1499 BOOL info_stdout = FALSE;
1501 /* Possible options for -R and -S */
1503 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1505 /* Need to define this in case we need to change the environment in order
1506 to get rid of a bogus time zone. We have to make it char rather than uschar
1507 because some OS define it in /usr/include/unistd.h. */
1509 extern char **environ;
1511 /* If the Exim user and/or group and/or the configuration file owner/group were
1512 defined by ref:name at build time, we must now find the actual uid/gid values.
1513 This is a feature to make the lives of binary distributors easier. */
1515 #ifdef EXIM_USERNAME
1516 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1520 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1524 /* If ref:name uses a number as the name, route_finduser() returns
1525 TRUE with exim_uid set and pw coerced to NULL. */
1527 exim_gid = pw->pw_gid;
1528 #ifndef EXIM_GROUPNAME
1532 "exim: ref:name should specify a usercode, not a group.\n"
1533 "exim: can't let you get away with it unless you also specify a group.\n");
1540 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1546 #ifdef EXIM_GROUPNAME
1547 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1549 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1555 #ifdef CONFIGURE_OWNERNAME
1556 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1558 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1559 CONFIGURE_OWNERNAME);
1564 /* We default the system_filter_user to be the Exim run-time user, as a
1565 sane non-root value. */
1566 system_filter_uid = exim_uid;
1568 #ifdef CONFIGURE_GROUPNAME
1569 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1571 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1572 CONFIGURE_GROUPNAME);
1577 /* In the Cygwin environment, some initialization needs doing. It is fudged
1578 in by means of this macro. */
1584 /* Check a field which is patched when we are running Exim within its
1585 testing harness; do a fast initial check, and then the whole thing. */
1587 running_in_test_harness =
1588 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1590 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1591 at the start of a program; however, it seems that some environments do not
1592 follow this. A "strange" locale can affect the formatting of timestamps, so we
1595 setlocale(LC_ALL, "C");
1597 /* Set up the default handler for timing using alarm(). */
1599 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1601 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1602 because store_malloc writes a log entry on failure. */
1604 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1605 if (log_buffer == NULL)
1607 fprintf(stderr, "exim: failed to get store for log buffer\n");
1611 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1612 NULL when the daemon is run and the file is closed. We have to use this
1613 indirection, because some systems don't allow writing to the variable "stderr".
1616 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1618 /* Arrange for the PCRE regex library to use our store functions. Note that
1619 the normal calls are actually macros that add additional arguments for
1620 debugging purposes so we have to assign specially constructed functions here.
1621 The default is to use store in the stacking pool, but this is overridden in the
1622 regex_must_compile() function. */
1624 pcre_malloc = function_store_get;
1625 pcre_free = function_dummy_free;
1627 /* Ensure there is a big buffer for temporary use in several places. It is put
1628 in malloc store so that it can be freed for enlargement if necessary. */
1630 big_buffer = store_malloc(big_buffer_size);
1632 /* Set up the handler for the data request signal, and set the initial
1633 descriptive text. */
1635 set_process_info("initializing");
1636 os_restarting_signal(SIGUSR1, usr1_handler);
1638 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1639 in the daemon code. For the rest of Exim's uses, we ignore it. */
1641 signal(SIGHUP, SIG_IGN);
1643 /* We don't want to die on pipe errors as the code is written to handle
1644 the write error instead. */
1646 signal(SIGPIPE, SIG_IGN);
1648 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1649 set to SIG_IGN. This causes subprocesses that complete before the parent
1650 process waits for them not to hang around, so when Exim calls wait(), nothing
1651 is there. The wait() code has been made robust against this, but let's ensure
1652 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1653 ending status. We use sigaction rather than plain signal() on those OS where
1654 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1655 problem on AIX with this.) */
1659 struct sigaction act;
1660 act.sa_handler = SIG_DFL;
1661 sigemptyset(&(act.sa_mask));
1663 sigaction(SIGCHLD, &act, NULL);
1666 signal(SIGCHLD, SIG_DFL);
1669 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1674 /* Set up the version number. Set up the leading 'E' for the external form of
1675 message ids, set the pointer to the internal form, and initialize it to
1676 indicate no message being processed. */
1679 message_id_option[0] = '-';
1680 message_id_external = message_id_option + 1;
1681 message_id_external[0] = 'E';
1682 message_id = message_id_external + 1;
1685 /* Set the umask to zero so that any files Exim creates using open() are
1686 created with the modes that it specifies. NOTE: Files created with fopen() have
1687 a problem, which was not recognized till rather late (February 2006). With this
1688 umask, such files will be world writeable. (They are all content scanning files
1689 in the spool directory, which isn't world-accessible, so this is not a
1690 disaster, but it's untidy.) I don't want to change this overall setting,
1691 however, because it will interact badly with the open() calls. Instead, there's
1692 now a function called modefopen() that fiddles with the umask while calling
1697 /* Precompile the regular expression for matching a message id. Keep this in
1698 step with the code that generates ids in the accept.c module. We need to do
1699 this here, because the -M options check their arguments for syntactic validity
1700 using mac_ismsgid, which uses this. */
1703 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1705 /* Precompile the regular expression that is used for matching an SMTP error
1706 code, possibly extended, at the start of an error message. Note that the
1707 terminating whitespace character is included. */
1710 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1713 #ifdef WHITELIST_D_MACROS
1714 /* Precompile the regular expression used to filter the content of macros
1715 given to -D for permissibility. */
1717 regex_whitelisted_macro =
1718 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1722 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1723 this seems to be a generally accepted convention, since one finds symbolic
1724 links called "mailq" in standard OS configurations. */
1726 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1727 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1730 receiving_message = FALSE;
1731 called_as = US"-mailq";
1734 /* If the program is called as "rmail" treat it as equivalent to
1735 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1736 i.e. preventing a single dot on a line from terminating the message, and
1737 returning with zero return code, even in cases of error (provided an error
1738 message has been sent). */
1740 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1741 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1744 called_as = US"-rmail";
1745 errors_sender_rc = EXIT_SUCCESS;
1748 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1749 this is a smail convention. */
1751 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1752 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1754 smtp_input = smtp_batched_input = TRUE;
1755 called_as = US"-rsmtp";
1758 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1759 this is a smail convention. */
1761 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1762 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1765 receiving_message = FALSE;
1766 called_as = US"-runq";
1769 /* If the program is called as "newaliases" treat it as equivalent to
1770 "exim -bi"; this is a sendmail convention. */
1772 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1773 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1776 receiving_message = FALSE;
1777 called_as = US"-newaliases";
1780 /* Save the original effective uid for a couple of uses later. It should
1781 normally be root, but in some esoteric environments it may not be. */
1783 original_euid = geteuid();
1785 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1786 to be the same as the real ones. This makes a difference only if Exim is setuid
1787 (or setgid) to something other than root, which could be the case in some
1788 special configurations. */
1790 real_uid = getuid();
1791 real_gid = getgid();
1793 if (real_uid == root_uid)
1795 rv = setgid(real_gid);
1798 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1799 (long int)real_gid, strerror(errno));
1802 rv = setuid(real_uid);
1805 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1806 (long int)real_uid, strerror(errno));
1811 /* If neither the original real uid nor the original euid was root, Exim is
1812 running in an unprivileged state. */
1814 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1816 /* Scan the program's arguments. Some can be dealt with right away; others are
1817 simply recorded for checking and handling afterwards. Do a high-level switch
1818 on the second character (the one after '-'), to save some effort. */
1820 for (i = 1; i < argc; i++)
1822 BOOL badarg = FALSE;
1823 uschar *arg = argv[i];
1827 /* An argument not starting with '-' is the start of a recipients list;
1828 break out of the options-scanning loop. */
1836 /* An option consistion of -- terminates the options */
1838 if (Ustrcmp(arg, "--") == 0)
1840 recipients_arg = i + 1;
1844 /* Handle flagged options */
1846 switchchar = arg[1];
1849 /* Make all -ex options synonymous with -oex arguments, since that
1850 is assumed by various callers. Also make -qR options synonymous with -R
1851 options, as that seems to be required as well. Allow for -qqR too, and
1852 the same for -S options. */
1854 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1855 Ustrncmp(arg+1, "qR", 2) == 0 ||
1856 Ustrncmp(arg+1, "qS", 2) == 0)
1858 switchchar = arg[2];
1861 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1863 switchchar = arg[3];
1865 queue_2stage = TRUE;
1868 /* Make -r synonymous with -f, since it is a documented alias */
1870 else if (arg[1] == 'r') switchchar = 'f';
1872 /* Make -ov synonymous with -v */
1874 else if (Ustrcmp(arg, "-ov") == 0)
1880 /* deal with --option_aliases */
1881 else if (switchchar == '-')
1883 if (Ustrcmp(argrest, "help") == 0)
1885 usage_wanted = TRUE;
1888 else if (Ustrcmp(argrest, "version") == 0)
1895 /* High-level switch on active initial letter */
1900 /* sendmail uses -Ac and -Am to control which .cf file is used;
1903 if (*argrest == '\0') { badarg = TRUE; break; }
1906 BOOL ignore = FALSE;
1911 if (*(argrest + 1) == '\0')
1915 if (!ignore) { badarg = TRUE; break; }
1919 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1920 so has no need of it. */
1923 if (*argrest == 0) i++; /* Skip over the type */
1928 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1930 /* -bd: Run in daemon mode, awaiting SMTP connections.
1931 -bdf: Ditto, but in the foreground.
1934 if (*argrest == 'd')
1936 daemon_listen = TRUE;
1937 if (*(++argrest) == 'f') background_daemon = FALSE;
1938 else if (*argrest != 0) { badarg = TRUE; break; }
1941 /* -be: Run in expansion test mode
1942 -bem: Ditto, but read a message from a file first
1945 else if (*argrest == 'e')
1947 expansion_test = checking = TRUE;
1948 if (argrest[1] == 'm')
1950 if (++i >= argc) { badarg = TRUE; break; }
1951 expansion_test_message = argv[i];
1954 if (argrest[1] != 0) { badarg = TRUE; break; }
1957 /* -bF: Run system filter test */
1959 else if (*argrest == 'F')
1961 filter_test |= FTEST_SYSTEM;
1962 if (*(++argrest) != 0) { badarg = TRUE; break; }
1963 if (++i < argc) filter_test_sfile = argv[i]; else
1965 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1970 /* -bf: Run user filter test
1971 -bfd: Set domain for filter testing
1972 -bfl: Set local part for filter testing
1973 -bfp: Set prefix for filter testing
1974 -bfs: Set suffix for filter testing
1977 else if (*argrest == 'f')
1979 if (*(++argrest) == 0)
1981 filter_test |= FTEST_USER;
1982 if (++i < argc) filter_test_ufile = argv[i]; else
1984 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1992 fprintf(stderr, "exim: string expected after %s\n", arg);
1995 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1996 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1997 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1998 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1999 else { badarg = TRUE; break; }
2003 /* -bh: Host checking - an IP address must follow. */
2005 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2007 if (++i >= argc) { badarg = TRUE; break; }
2008 sender_host_address = argv[i];
2009 host_checking = checking = log_testing_mode = TRUE;
2010 host_checking_callout = argrest[1] == 'c';
2013 /* -bi: This option is used by sendmail to initialize *the* alias file,
2014 though it has the -oA option to specify a different file. Exim has no
2015 concept of *the* alias file, but since Sun's YP make script calls
2016 sendmail this way, some support must be provided. */
2018 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2020 /* -bI: provide information, of the type to follow after a colon.
2021 This is an Exim flag. */
2023 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2025 uschar *p = &argrest[2];
2026 info_flag = CMDINFO_HELP;
2029 if (strcmpic(p, CUS"sieve") == 0)
2031 info_flag = CMDINFO_SIEVE;
2034 else if (strcmpic(p, CUS"dscp") == 0)
2036 info_flag = CMDINFO_DSCP;
2039 else if (strcmpic(p, CUS"help") == 0)
2046 /* -bm: Accept and deliver message - the default option. Reinstate
2047 receiving_message, which got turned off for all -b options. */
2049 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2051 /* -bmalware: test the filename given for malware */
2053 else if (Ustrcmp(argrest, "malware") == 0)
2055 if (++i >= argc) { badarg = TRUE; break; }
2056 malware_test_file = argv[i];
2059 /* -bnq: For locally originating messages, do not qualify unqualified
2060 addresses. In the envelope, this causes errors; in header lines they
2063 else if (Ustrcmp(argrest, "nq") == 0)
2065 allow_unqualified_sender = FALSE;
2066 allow_unqualified_recipient = FALSE;
2069 /* -bpxx: List the contents of the mail queue, in various forms. If
2070 the option is -bpc, just a queue count is needed. Otherwise, if the
2071 first letter after p is r, then order is random. */
2073 else if (*argrest == 'p')
2075 if (*(++argrest) == 'c')
2078 if (*(++argrest) != 0) badarg = TRUE;
2082 if (*argrest == 'r')
2084 list_queue_option = 8;
2087 else list_queue_option = 0;
2091 /* -bp: List the contents of the mail queue, top-level only */
2093 if (*argrest == 0) {}
2095 /* -bpu: List the contents of the mail queue, top-level undelivered */
2097 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2099 /* -bpa: List the contents of the mail queue, including all delivered */
2101 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2103 /* Unknown after -bp[r] */
2113 /* -bP: List the configuration variables given as the address list.
2114 Force -v, so configuration errors get displayed. */
2116 else if (Ustrcmp(argrest, "P") == 0)
2118 list_options = TRUE;
2119 debug_selector |= D_v;
2120 debug_file = stderr;
2123 /* -brt: Test retry configuration lookup */
2125 else if (Ustrcmp(argrest, "rt") == 0)
2127 test_retry_arg = i + 1;
2131 /* -brw: Test rewrite configuration */
2133 else if (Ustrcmp(argrest, "rw") == 0)
2135 test_rewrite_arg = i + 1;
2139 /* -bS: Read SMTP commands on standard input, but produce no replies -
2140 all errors are reported by sending messages. */
2142 else if (Ustrcmp(argrest, "S") == 0)
2143 smtp_input = smtp_batched_input = receiving_message = TRUE;
2145 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2146 on standard output. */
2148 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2150 /* -bt: address testing mode */
2152 else if (Ustrcmp(argrest, "t") == 0)
2153 address_test_mode = checking = log_testing_mode = TRUE;
2155 /* -bv: verify addresses */
2157 else if (Ustrcmp(argrest, "v") == 0)
2158 verify_address_mode = checking = log_testing_mode = TRUE;
2160 /* -bvs: verify sender addresses */
2162 else if (Ustrcmp(argrest, "vs") == 0)
2164 verify_address_mode = checking = log_testing_mode = TRUE;
2165 verify_as_sender = TRUE;
2168 /* -bV: Print version string and support details */
2170 else if (Ustrcmp(argrest, "V") == 0)
2172 printf("Exim version %s #%s built %s\n", version_string,
2173 version_cnumber, version_date);
2174 printf("%s\n", CS version_copyright);
2175 version_printed = TRUE;
2176 show_whats_supported(stdout);
2179 /* -bw: inetd wait mode, accept a listening socket as stdin */
2181 else if (*argrest == 'w')
2183 inetd_wait_mode = TRUE;
2184 background_daemon = FALSE;
2185 daemon_listen = TRUE;
2186 if (*(++argrest) != '\0')
2188 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2189 if (inetd_wait_timeout <= 0)
2191 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2201 /* -C: change configuration file list; ignore if it isn't really
2202 a change! Enforce a prefix check if required. */
2207 if(++i < argc) argrest = argv[i]; else
2208 { badarg = TRUE; break; }
2210 if (Ustrcmp(config_main_filelist, argrest) != 0)
2212 #ifdef ALT_CONFIG_PREFIX
2214 int len = Ustrlen(ALT_CONFIG_PREFIX);
2215 uschar *list = argrest;
2217 while((filename = string_nextinlist(&list, &sep, big_buffer,
2218 big_buffer_size)) != NULL)
2220 if ((Ustrlen(filename) < len ||
2221 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2222 Ustrstr(filename, "/../") != NULL) &&
2223 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2225 fprintf(stderr, "-C Permission denied\n");
2230 if (real_uid != root_uid)
2232 #ifdef TRUSTED_CONFIG_LIST
2234 if (real_uid != exim_uid
2235 #ifdef CONFIGURE_OWNER
2236 && real_uid != config_uid
2239 trusted_config = FALSE;
2242 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2245 struct stat statbuf;
2247 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2248 (statbuf.st_uid != root_uid /* owner not root */
2249 #ifdef CONFIGURE_OWNER
2250 && statbuf.st_uid != config_uid /* owner not the special one */
2253 (statbuf.st_gid != root_gid /* group not root */
2254 #ifdef CONFIGURE_GROUP
2255 && statbuf.st_gid != config_gid /* group not the special one */
2257 && (statbuf.st_mode & 020) != 0 /* group writeable */
2259 (statbuf.st_mode & 2) != 0) /* world writeable */
2261 trusted_config = FALSE;
2266 /* Well, the trust list at least is up to scratch... */
2267 void *reset_point = store_get(0);
2268 uschar *trusted_configs[32];
2272 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2274 uschar *start = big_buffer, *nl;
2275 while (*start && isspace(*start))
2279 nl = Ustrchr(start, '\n');
2282 trusted_configs[nr_configs++] = string_copy(start);
2283 if (nr_configs == 32)
2291 uschar *list = argrest;
2293 while (trusted_config && (filename = string_nextinlist(&list,
2294 &sep, big_buffer, big_buffer_size)) != NULL)
2296 for (i=0; i < nr_configs; i++)
2298 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2301 if (i == nr_configs)
2303 trusted_config = FALSE;
2307 store_reset(reset_point);
2311 /* No valid prefixes found in trust_list file. */
2312 trusted_config = FALSE;
2318 /* Could not open trust_list file. */
2319 trusted_config = FALSE;
2323 /* Not root; don't trust config */
2324 trusted_config = FALSE;
2328 config_main_filelist = argrest;
2329 config_changed = TRUE;
2334 /* -D: set up a macro definition */
2337 #ifdef DISABLE_D_OPTION
2338 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2343 macro_item *mlast = NULL;
2346 uschar *s = argrest;
2348 while (isspace(*s)) s++;
2350 if (*s < 'A' || *s > 'Z')
2352 fprintf(stderr, "exim: macro name set by -D must start with "
2353 "an upper case letter\n");
2357 while (isalnum(*s) || *s == '_')
2359 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2363 if (ptr == 0) { badarg = TRUE; break; }
2364 while (isspace(*s)) s++;
2367 if (*s++ != '=') { badarg = TRUE; break; }
2368 while (isspace(*s)) s++;
2371 for (m = macros; m != NULL; m = m->next)
2373 if (Ustrcmp(m->name, name) == 0)
2375 fprintf(stderr, "exim: duplicated -D in command line\n");
2381 m = store_get(sizeof(macro_item) + Ustrlen(name));
2383 m->command_line = TRUE;
2384 if (mlast == NULL) macros = m; else mlast->next = m;
2385 Ustrcpy(m->name, name);
2386 m->replacement = string_copy(s);
2388 if (clmacro_count >= MAX_CLMACROS)
2390 fprintf(stderr, "exim: too many -D options on command line\n");
2393 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2399 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2400 The latter is now a no-op, retained for compatibility only. If -dd is used,
2401 debugging subprocesses of the daemon is disabled. */
2404 if (Ustrcmp(argrest, "ropcr") == 0)
2406 /* drop_cr = TRUE; */
2409 /* Use an intermediate variable so that we don't set debugging while
2410 decoding the debugging bits. */
2414 unsigned int selector = D_default;
2417 if (*argrest == 'd')
2419 debug_daemon = TRUE;
2423 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2424 debug_options_count, US"debug", 0);
2425 debug_selector = selector;
2430 /* -E: This is a local error message. This option is not intended for
2431 external use at all, but is not restricted to trusted callers because it
2432 does no harm (just suppresses certain error messages) and if Exim is run
2433 not setuid root it won't always be trusted when it generates error
2434 messages using this option. If there is a message id following -E, point
2435 message_reference at it, for logging. */
2438 local_error_message = TRUE;
2439 if (mac_ismsgid(argrest)) message_reference = argrest;
2443 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2444 option, so it looks as if historically the -oex options are also callable
2445 without the leading -o. So we have to accept them. Before the switch,
2446 anything starting -oe has been converted to -e. Exim does not support all
2447 of the sendmail error options. */
2450 if (Ustrcmp(argrest, "e") == 0)
2452 arg_error_handling = ERRORS_SENDER;
2453 errors_sender_rc = EXIT_SUCCESS;
2455 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2456 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2457 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2458 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2463 /* -F: Set sender's full name, used instead of the gecos entry from
2464 the password file. Since users can usually alter their gecos entries,
2465 there's no security involved in using this instead. The data can follow
2466 the -F or be in the next argument. */
2471 if(++i < argc) argrest = argv[i]; else
2472 { badarg = TRUE; break; }
2474 originator_name = argrest;
2475 sender_name_forced = TRUE;
2479 /* -f: Set sender's address - this value is only actually used if Exim is
2480 run by a trusted user, or if untrusted_set_sender is set and matches the
2481 address, except that the null address can always be set by any user. The
2482 test for this happens later, when the value given here is ignored when not
2483 permitted. For an untrusted user, the actual sender is still put in Sender:
2484 if it doesn't match the From: header (unless no_local_from_check is set).
2485 The data can follow the -f or be in the next argument. The -r switch is an
2486 obsolete form of -f but since there appear to be programs out there that
2487 use anything that sendmail has ever supported, better accept it - the
2488 synonymizing is done before the switch above.
2490 At this stage, we must allow domain literal addresses, because we don't
2491 know what the setting of allow_domain_literals is yet. Ditto for trailing
2492 dots and strip_trailing_dot. */
2500 if (i+1 < argc) argrest = argv[++i]; else
2501 { badarg = TRUE; break; }
2505 sender_address = string_sprintf(""); /* Ensure writeable memory */
2509 uschar *temp = argrest + Ustrlen(argrest) - 1;
2510 while (temp >= argrest && isspace(*temp)) temp--;
2511 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2512 allow_domain_literals = TRUE;
2513 strip_trailing_dot = TRUE;
2514 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2515 &sender_address_domain, TRUE);
2516 allow_domain_literals = FALSE;
2517 strip_trailing_dot = FALSE;
2518 if (sender_address == NULL)
2520 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2521 return EXIT_FAILURE;
2524 sender_address_forced = TRUE;
2528 /* -G: sendmail invocation to specify that it's a gateway submission and
2529 sendmail may complain about problems instead of fixing them.
2530 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2531 not at this time complain about problems. */
2537 /* -h: Set the hop count for an incoming message. Exim does not currently
2538 support this; it always computes it by counting the Received: headers.
2539 To put it in will require a change to the spool header file format. */
2544 if(++i < argc) argrest = argv[i]; else
2545 { badarg = TRUE; break; }
2547 if (!isdigit(*argrest)) badarg = TRUE;
2551 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2552 not to be documented for sendmail but mailx (at least) uses it) */
2555 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2559 /* -L: set the identifier used for syslog; equivalent to setting
2560 syslog_processname in the config file, but needs to be an admin option. */
2563 if (*argrest == '\0')
2565 if(++i < argc) argrest = argv[i]; else
2566 { badarg = TRUE; break; }
2568 sz = Ustrlen(argrest);
2571 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2572 return EXIT_FAILURE;
2576 fprintf(stderr, "exim: the -L syslog name is too short\n");
2577 return EXIT_FAILURE;
2579 cmdline_syslog_name = argrest;
2583 receiving_message = FALSE;
2585 /* -MC: continue delivery of another message via an existing open
2586 file descriptor. This option is used for an internal call by the
2587 smtp transport when there is a pending message waiting to go to an
2588 address to which it has got a connection. Five subsequent arguments are
2589 required: transport name, host name, IP address, sequence number, and
2590 message_id. Transports may decline to create new processes if the sequence
2591 number gets too big. The channel is stdin. This (-MC) must be the last
2592 argument. There's a subsequent check that the real-uid is privileged.
2594 If we are running in the test harness. delay for a bit, to let the process
2595 that set this one up complete. This makes for repeatability of the logging,
2598 if (Ustrcmp(argrest, "C") == 0)
2600 union sockaddr_46 interface_sock;
2601 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2605 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2606 return EXIT_FAILURE;
2609 if (msg_action_arg >= 0)
2611 fprintf(stderr, "exim: incompatible arguments\n");
2612 return EXIT_FAILURE;
2615 continue_transport = argv[++i];
2616 continue_hostname = argv[++i];
2617 continue_host_address = argv[++i];
2618 continue_sequence = Uatoi(argv[++i]);
2619 msg_action = MSG_DELIVER;
2620 msg_action_arg = ++i;
2621 forced_delivery = TRUE;
2622 queue_run_pid = passed_qr_pid;
2623 queue_run_pipe = passed_qr_pipe;
2625 if (!mac_ismsgid(argv[i]))
2627 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2629 return EXIT_FAILURE;
2632 /* Set up $sending_ip_address and $sending_port */
2634 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2636 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2640 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2642 return EXIT_FAILURE;
2645 if (running_in_test_harness) millisleep(500);
2649 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2650 precedes -MC (see above). The flag indicates that the host to which
2651 Exim is connected has accepted an AUTH sequence. */
2653 else if (Ustrcmp(argrest, "CA") == 0)
2655 smtp_authenticated = TRUE;
2659 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2660 it preceded -MC (see above) */
2662 else if (Ustrcmp(argrest, "CP") == 0)
2664 smtp_use_pipelining = TRUE;
2668 /* -MCQ: pass on the pid of the queue-running process that started
2669 this chain of deliveries and the fd of its synchronizing pipe; this
2670 is useful only when it precedes -MC (see above) */
2672 else if (Ustrcmp(argrest, "CQ") == 0)
2674 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2676 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2681 /* -MCS: set the smtp_use_size flag; this is useful only when it
2682 precedes -MC (see above) */
2684 else if (Ustrcmp(argrest, "CS") == 0)
2686 smtp_use_size = TRUE;
2690 /* -MCT: set the tls_offered flag; this is useful only when it
2691 precedes -MC (see above). The flag indicates that the host to which
2692 Exim is connected has offered TLS support. */
2695 else if (Ustrcmp(argrest, "CT") == 0)
2702 /* -M[x]: various operations on the following list of message ids:
2703 -M deliver the messages, ignoring next retry times and thawing
2704 -Mc deliver the messages, checking next retry times, no thawing
2705 -Mf freeze the messages
2706 -Mg give up on the messages
2707 -Mt thaw the messages
2708 -Mrm remove the messages
2709 In the above cases, this must be the last option. There are also the
2710 following options which are followed by a single message id, and which
2711 act on that message. Some of them use the "recipient" addresses as well.
2712 -Mar add recipient(s)
2713 -Mmad mark all recipients delivered
2714 -Mmd mark recipients(s) delivered
2716 -Mset load a message for use with -be
2718 -Mvc show copy (of whole message, in RFC 2822 format)
2723 else if (*argrest == 0)
2725 msg_action = MSG_DELIVER;
2726 forced_delivery = deliver_force_thaw = TRUE;
2728 else if (Ustrcmp(argrest, "ar") == 0)
2730 msg_action = MSG_ADD_RECIPIENT;
2731 one_msg_action = TRUE;
2733 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2734 else if (Ustrcmp(argrest, "es") == 0)
2736 msg_action = MSG_EDIT_SENDER;
2737 one_msg_action = TRUE;
2739 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2740 else if (Ustrcmp(argrest, "g") == 0)
2742 msg_action = MSG_DELIVER;
2743 deliver_give_up = TRUE;
2745 else if (Ustrcmp(argrest, "mad") == 0)
2747 msg_action = MSG_MARK_ALL_DELIVERED;
2749 else if (Ustrcmp(argrest, "md") == 0)
2751 msg_action = MSG_MARK_DELIVERED;
2752 one_msg_action = TRUE;
2754 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2755 else if (Ustrcmp(argrest, "set") == 0)
2757 msg_action = MSG_LOAD;
2758 one_msg_action = TRUE;
2760 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2761 else if (Ustrcmp(argrest, "vb") == 0)
2763 msg_action = MSG_SHOW_BODY;
2764 one_msg_action = TRUE;
2766 else if (Ustrcmp(argrest, "vc") == 0)
2768 msg_action = MSG_SHOW_COPY;
2769 one_msg_action = TRUE;
2771 else if (Ustrcmp(argrest, "vh") == 0)
2773 msg_action = MSG_SHOW_HEADER;
2774 one_msg_action = TRUE;
2776 else if (Ustrcmp(argrest, "vl") == 0)
2778 msg_action = MSG_SHOW_LOG;
2779 one_msg_action = TRUE;
2781 else { badarg = TRUE; break; }
2783 /* All the -Mxx options require at least one message id. */
2785 msg_action_arg = i + 1;
2786 if (msg_action_arg >= argc)
2788 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2789 return EXIT_FAILURE;
2792 /* Some require only message ids to follow */
2794 if (!one_msg_action)
2797 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2799 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2801 return EXIT_FAILURE;
2803 goto END_ARG; /* Remaining args are ids */
2806 /* Others require only one message id, possibly followed by addresses,
2807 which will be handled as normal arguments. */
2811 if (!mac_ismsgid(argv[msg_action_arg]))
2813 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2814 argv[msg_action_arg], arg);
2815 return EXIT_FAILURE;
2822 /* Some programs seem to call the -om option without the leading o;
2823 for sendmail it askes for "me too". Exim always does this. */
2826 if (*argrest != 0) badarg = TRUE;
2830 /* -N: don't do delivery - a debugging option that stops transports doing
2831 their thing. It implies debugging at the D_v level. */
2836 dont_deliver = TRUE;
2837 debug_selector |= D_v;
2838 debug_file = stderr;
2844 /* -n: This means "don't alias" in sendmail, apparently.
2845 For normal invocations, it has no effect.
2846 It may affect some other options. */
2852 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2853 option to the specified value. This form uses long names. We need to handle
2854 -O option=value and -Ooption=value. */
2861 fprintf(stderr, "exim: string expected after -O\n");
2869 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2872 if (*argrest == 'A')
2874 alias_arg = argrest + 1;
2875 if (alias_arg[0] == 0)
2877 if (i+1 < argc) alias_arg = argv[++i]; else
2879 fprintf(stderr, "exim: string expected after -oA\n");
2885 /* -oB: Set a connection message max value for remote deliveries */
2887 else if (*argrest == 'B')
2889 uschar *p = argrest + 1;
2892 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2894 connection_max_messages = 1;
2903 fprintf(stderr, "exim: number expected after -oB\n");
2906 connection_max_messages = Uatoi(p);
2910 /* -odb: background delivery */
2912 else if (Ustrcmp(argrest, "db") == 0)
2914 synchronous_delivery = FALSE;
2915 arg_queue_only = FALSE;
2916 queue_only_set = TRUE;
2919 /* -odf: foreground delivery (smail-compatible option); same effect as
2920 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2923 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2925 synchronous_delivery = TRUE;
2926 arg_queue_only = FALSE;
2927 queue_only_set = TRUE;
2930 /* -odq: queue only */
2932 else if (Ustrcmp(argrest, "dq") == 0)
2934 synchronous_delivery = FALSE;
2935 arg_queue_only = TRUE;
2936 queue_only_set = TRUE;
2939 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2940 but no remote delivery */
2942 else if (Ustrcmp(argrest, "dqs") == 0)
2945 arg_queue_only = FALSE;
2946 queue_only_set = TRUE;
2949 /* -oex: Sendmail error flags. As these are also accepted without the
2950 leading -o prefix, for compatibility with vacation and other callers,
2951 they are handled with -e above. */
2953 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2954 -oitrue: Another sendmail syntax for the same */
2956 else if (Ustrcmp(argrest, "i") == 0 ||
2957 Ustrcmp(argrest, "itrue") == 0)
2960 /* -oM*: Set various characteristics for an incoming message; actually
2961 acted on for trusted callers only. */
2963 else if (*argrest == 'M')
2967 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2971 /* -oMa: Set sender host address */
2973 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2975 /* -oMaa: Set authenticator name */
2977 else if (Ustrcmp(argrest, "Maa") == 0)
2978 sender_host_authenticated = argv[++i];
2980 /* -oMas: setting authenticated sender */
2982 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2984 /* -oMai: setting authenticated id */
2986 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2988 /* -oMi: Set incoming interface address */
2990 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2992 /* -oMm: Message reference */
2994 else if (Ustrcmp(argrest, "Mm") == 0)
2996 if (!mac_ismsgid(argv[i+1]))
2998 fprintf(stderr,"-oMm must be a valid message ID\n");
3001 if (!trusted_config)
3003 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3006 message_reference = argv[++i];
3009 /* -oMr: Received protocol */
3011 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3013 /* -oMs: Set sender host name */
3015 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3017 /* -oMt: Set sender ident */
3019 else if (Ustrcmp(argrest, "Mt") == 0)
3021 sender_ident_set = TRUE;
3022 sender_ident = argv[++i];
3025 /* Else a bad argument */
3034 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3035 seem to call this as -m (undocumented), so that is also accepted (see
3038 else if (Ustrcmp(argrest, "m") == 0) {}
3040 /* -oo: An ancient flag for old-style addresses which still seems to
3041 crop up in some calls (see in SCO). */
3043 else if (Ustrcmp(argrest, "o") == 0) {}
3045 /* -oP <name>: set pid file path for daemon */
3047 else if (Ustrcmp(argrest, "P") == 0)
3048 override_pid_file_path = argv[++i];
3050 /* -or <n>: set timeout for non-SMTP acceptance
3051 -os <n>: set timeout for SMTP acceptance */
3053 else if (*argrest == 'r' || *argrest == 's')
3055 int *tp = (*argrest == 'r')?
3056 &arg_receive_timeout : &arg_smtp_receive_timeout;
3057 if (argrest[1] == 0)
3059 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3061 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3064 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3069 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3071 else if (Ustrcmp(argrest, "X") == 0)
3072 override_local_interfaces = argv[++i];
3074 /* Unknown -o argument */
3080 /* -ps: force Perl startup; -pd force delayed Perl startup */
3084 if (*argrest == 's' && argrest[1] == 0)
3086 perl_start_option = 1;
3089 if (*argrest == 'd' && argrest[1] == 0)
3091 perl_start_option = -1;
3096 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3097 which sets the host protocol and host name */
3101 if (i+1 < argc) argrest = argv[++i]; else
3102 { badarg = TRUE; break; }
3107 uschar *hn = Ustrchr(argrest, ':');
3110 received_protocol = argrest;
3114 received_protocol = string_copyn(argrest, hn - argrest);
3115 sender_host_name = hn + 1;
3122 receiving_message = FALSE;
3123 if (queue_interval >= 0)
3125 fprintf(stderr, "exim: -q specified more than once\n");
3129 /* -qq...: Do queue runs in a 2-stage manner */
3131 if (*argrest == 'q')
3133 queue_2stage = TRUE;
3137 /* -qi...: Do only first (initial) deliveries */
3139 if (*argrest == 'i')
3141 queue_run_first_delivery = TRUE;
3145 /* -qf...: Run the queue, forcing deliveries
3146 -qff..: Ditto, forcing thawing as well */
3148 if (*argrest == 'f')
3150 queue_run_force = TRUE;
3151 if (*(++argrest) == 'f')
3153 deliver_force_thaw = TRUE;
3158 /* -q[f][f]l...: Run the queue only on local deliveries */
3160 if (*argrest == 'l')
3162 queue_run_local = TRUE;
3166 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3167 optionally starting from a given message id. */
3169 if (*argrest == 0 &&
3170 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3173 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3174 start_queue_run_id = argv[++i];
3175 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3176 stop_queue_run_id = argv[++i];
3179 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3180 optionally local only. */
3185 queue_interval = readconf_readtime(argrest, 0, FALSE);
3187 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3188 if (queue_interval <= 0)
3190 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3197 case 'R': /* Synonymous with -qR... */
3198 receiving_message = FALSE;
3200 /* -Rf: As -R (below) but force all deliveries,
3201 -Rff: Ditto, but also thaw all frozen messages,
3202 -Rr: String is regex
3203 -Rrf: Regex and force
3204 -Rrff: Regex and force and thaw
3206 in all cases provided there are no further characters in this
3212 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3214 if (Ustrcmp(argrest, rsopts[i]) == 0)
3216 if (i != 2) queue_run_force = TRUE;
3217 if (i >= 2) deliver_selectstring_regex = TRUE;
3218 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3219 argrest += Ustrlen(rsopts[i]);
3224 /* -R: Set string to match in addresses for forced queue run to
3225 pick out particular messages. */
3229 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3231 fprintf(stderr, "exim: string expected after -R\n");
3235 else deliver_selectstring = argrest;
3239 /* -r: an obsolete synonym for -f (see above) */
3242 /* -S: Like -R but works on sender. */
3244 case 'S': /* Synonymous with -qS... */
3245 receiving_message = FALSE;
3247 /* -Sf: As -S (below) but force all deliveries,
3248 -Sff: Ditto, but also thaw all frozen messages,
3249 -Sr: String is regex
3250 -Srf: Regex and force
3251 -Srff: Regex and force and thaw
3253 in all cases provided there are no further characters in this
3259 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3261 if (Ustrcmp(argrest, rsopts[i]) == 0)
3263 if (i != 2) queue_run_force = TRUE;
3264 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3265 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3266 argrest += Ustrlen(rsopts[i]);
3271 /* -S: Set string to match in addresses for forced queue run to
3272 pick out particular messages. */
3276 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3278 fprintf(stderr, "exim: string expected after -S\n");
3282 else deliver_selectstring_sender = argrest;
3285 /* -Tqt is an option that is exclusively for use by the testing suite.
3286 It is not recognized in other circumstances. It allows for the setting up
3287 of explicit "queue times" so that various warning/retry things can be
3288 tested. Otherwise variability of clock ticks etc. cause problems. */
3291 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3292 fudged_queue_times = argv[++i];
3297 /* -t: Set flag to extract recipients from body of message. */
3300 if (*argrest == 0) extract_recipients = TRUE;
3302 /* -ti: Set flag to extract recipients from body of message, and also
3303 specify that dot does not end the message. */
3305 else if (Ustrcmp(argrest, "i") == 0)
3307 extract_recipients = TRUE;
3311 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3314 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3321 /* -U: This means "initial user submission" in sendmail, apparently. The
3322 doc claims that in future sendmail may refuse syntactically invalid
3323 messages instead of fixing them. For the moment, we just ignore it. */
3329 /* -v: verify things - this is a very low-level debugging */
3334 debug_selector |= D_v;
3335 debug_file = stderr;
3341 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3343 The -x flag tells the sendmail command that mail from a local
3344 mail program has National Language Support (NLS) extended characters
3345 in the body of the mail item. The sendmail command can send mail with
3346 extended NLS characters across networks that normally corrupts these
3349 As Exim is 8-bit clean, it just ignores this flag. */
3352 if (*argrest != 0) badarg = TRUE;
3355 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3356 logs to that file. We swallow the parameter and otherwise ignore it. */
3359 if (*argrest == '\0')
3363 fprintf(stderr, "exim: string expected after -X\n");
3369 /* All other initial characters are errors */
3374 } /* End of high-level switch statement */
3376 /* Failed to recognize the option, or syntax error */
3380 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3381 "option %s\n", arg);
3387 /* If -R or -S have been specified without -q, assume a single queue run. */
3389 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3390 queue_interval < 0) queue_interval = 0;
3394 /* If usage_wanted is set we call the usage function - which never returns */
3395 if (usage_wanted) exim_usage(called_as);
3397 /* Arguments have been processed. Check for incompatibilities. */
3399 (smtp_input || extract_recipients || recipients_arg < argc) &&
3400 (daemon_listen || queue_interval >= 0 || bi_option ||
3401 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3402 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3405 msg_action_arg > 0 &&
3406 (daemon_listen || queue_interval >= 0 || list_options ||
3407 (checking && msg_action != MSG_LOAD) ||
3408 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3411 (daemon_listen || queue_interval >= 0) &&
3412 (sender_address != NULL || list_options || list_queue || checking ||
3416 daemon_listen && queue_interval == 0
3419 inetd_wait_mode && queue_interval >= 0
3423 (checking || smtp_input || extract_recipients ||
3424 filter_test != FTEST_NONE || bi_option)
3427 verify_address_mode &&
3428 (address_test_mode || smtp_input || extract_recipients ||
3429 filter_test != FTEST_NONE || bi_option)
3432 address_test_mode && (smtp_input || extract_recipients ||
3433 filter_test != FTEST_NONE || bi_option)
3436 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3440 deliver_selectstring != NULL && queue_interval < 0
3443 msg_action == MSG_LOAD &&
3444 (!expansion_test || expansion_test_message != NULL)
3448 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3452 /* If debugging is set up, set the file and the file descriptor to pass on to
3453 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3454 to run in the foreground. */
3456 if (debug_selector != 0)
3458 debug_file = stderr;
3459 debug_fd = fileno(debug_file);
3460 background_daemon = FALSE;
3461 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3462 if (debug_selector != D_v) /* -v only doesn't show this */
3464 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3465 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3467 if (!version_printed)
3468 show_whats_supported(stderr);
3472 /* When started with root privilege, ensure that the limits on the number of
3473 open files and the number of processes (where that is accessible) are
3474 sufficiently large, or are unset, in case Exim has been called from an
3475 environment where the limits are screwed down. Not all OS have the ability to
3476 change some of these limits. */
3480 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3486 #ifdef RLIMIT_NOFILE
3487 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3489 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3491 rlp.rlim_cur = rlp.rlim_max = 0;
3494 /* I originally chose 1000 as a nice big number that was unlikely to
3495 be exceeded. It turns out that some older OS have a fixed upper limit of
3498 if (rlp.rlim_cur < 1000)
3500 rlp.rlim_cur = rlp.rlim_max = 1000;
3501 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3503 rlp.rlim_cur = rlp.rlim_max = 256;
3504 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3505 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3512 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3514 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3516 rlp.rlim_cur = rlp.rlim_max = 0;
3519 #ifdef RLIM_INFINITY
3520 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3522 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3524 if (rlp.rlim_cur < 1000)
3526 rlp.rlim_cur = rlp.rlim_max = 1000;
3528 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3529 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3535 /* Exim is normally entered as root (but some special configurations are
3536 possible that don't do this). However, it always spins off sub-processes that
3537 set their uid and gid as required for local delivery. We don't want to pass on
3538 any extra groups that root may belong to, so we want to get rid of them all at
3541 We need to obey setgroups() at this stage, before possibly giving up root
3542 privilege for a changed configuration file, but later on we might need to
3543 check on the additional groups for the admin user privilege - can't do that
3544 till after reading the config, which might specify the exim gid. Therefore,
3545 save the group list here first. */
3547 group_count = getgroups(NGROUPS_MAX, group_list);
3548 if (group_count < 0)
3550 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3554 /* There is a fundamental difference in some BSD systems in the matter of
3555 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3556 known not to be different. On the "different" systems there is a single group
3557 list, and the first entry in it is the current group. On all other versions of
3558 Unix there is a supplementary group list, which is in *addition* to the current
3559 group. Consequently, to get rid of all extraneous groups on a "standard" system
3560 you pass over 0 groups to setgroups(), while on a "different" system you pass
3561 over a single group - the current group, which is always the first group in the
3562 list. Calling setgroups() with zero groups on a "different" system results in
3563 an error return. The following code should cope with both types of system.
3565 However, if this process isn't running as root, setgroups() can't be used
3566 since you have to be root to run it, even if throwing away groups. Not being
3567 root here happens only in some unusual configurations. We just ignore the
3570 if (setgroups(0, NULL) != 0)
3572 if (setgroups(1, group_list) != 0 && !unprivileged)
3574 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3579 /* If the configuration file name has been altered by an argument on the
3580 command line (either a new file name or a macro definition) and the caller is
3581 not root, or if this is a filter testing run, remove any setuid privilege the
3582 program has and run as the underlying user.
3584 The exim user is locked out of this, which severely restricts the use of -C
3587 Otherwise, set the real ids to the effective values (should be root unless run
3588 from inetd, which it can either be root or the exim uid, if one is configured).
3590 There is a private mechanism for bypassing some of this, in order to make it
3591 possible to test lots of configurations automatically, without having either to
3592 recompile each time, or to patch in an actual configuration file name and other
3593 values (such as the path name). If running in the test harness, pretend that
3594 configuration file changes and macro definitions haven't happened. */
3597 (!trusted_config || /* Config changed, or */
3598 !macros_trusted()) && /* impermissible macros and */
3599 real_uid != root_uid && /* Not root, and */
3600 !running_in_test_harness /* Not fudged */
3602 expansion_test /* expansion testing */
3604 filter_test != FTEST_NONE) /* Filter testing */
3606 setgroups(group_count, group_list);
3607 exim_setugid(real_uid, real_gid, FALSE,
3608 US"-C, -D, -be or -bf forces real uid");
3609 removed_privilege = TRUE;
3611 /* In the normal case when Exim is called like this, stderr is available
3612 and should be used for any logging information because attempts to write
3613 to the log will usually fail. To arrange this, we unset really_exim. However,
3614 if no stderr is available there is no point - we might as well have a go
3615 at the log (if it fails, syslog will be written).
3617 Note that if the invoker is Exim, the logs remain available. Messing with
3618 this causes unlogged successful deliveries. */
3620 if ((log_stderr != NULL) && (real_uid != exim_uid))
3621 really_exim = FALSE;
3624 /* Privilege is to be retained for the moment. It may be dropped later,
3625 depending on the job that this Exim process has been asked to do. For now, set
3626 the real uid to the effective so that subsequent re-execs of Exim are done by a
3629 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3631 /* If testing a filter, open the file(s) now, before wasting time doing other
3632 setups and reading the message. */
3634 if ((filter_test & FTEST_SYSTEM) != 0)
3636 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3639 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3641 return EXIT_FAILURE;
3645 if ((filter_test & FTEST_USER) != 0)
3647 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3650 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3652 return EXIT_FAILURE;
3656 /* Initialise lookup_list
3657 If debugging, already called above via version reporting.
3658 In either case, we initialise the list of available lookups while running
3659 as root. All dynamically modules are loaded from a directory which is
3660 hard-coded into the binary and is code which, if not a module, would be
3661 part of Exim already. Ability to modify the content of the directory
3662 is equivalent to the ability to modify a setuid binary!
3664 This needs to happen before we read the main configuration. */
3667 /* Read the main runtime configuration data; this gives up if there
3668 is a failure. It leaves the configuration file open so that the subsequent
3669 configuration data for delivery can be read if needed. */
3673 /* If an action on specific messages is requested, or if a daemon or queue
3674 runner is being started, we need to know if Exim was called by an admin user.
3675 This is the case if the real user is root or exim, or if the real group is
3676 exim, or if one of the supplementary groups is exim or a group listed in
3677 admin_groups. We don't fail all message actions immediately if not admin_user,
3678 since some actions can be performed by non-admin users. Instead, set admin_user
3679 for later interrogation. */
3681 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3686 for (i = 0; i < group_count; i++)
3688 if (group_list[i] == exim_gid) admin_user = TRUE;
3689 else if (admin_groups != NULL)
3691 for (j = 1; j <= (int)(admin_groups[0]); j++)
3692 if (admin_groups[j] == group_list[i])
3693 { admin_user = TRUE; break; }
3695 if (admin_user) break;
3699 /* Another group of privileged users are the trusted users. These are root,
3700 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3701 are permitted to specify sender_addresses with -f on the command line, and
3702 other message parameters as well. */
3704 if (real_uid == root_uid || real_uid == exim_uid)
3705 trusted_caller = TRUE;
3710 if (trusted_users != NULL)
3712 for (i = 1; i <= (int)(trusted_users[0]); i++)
3713 if (trusted_users[i] == real_uid)
3714 { trusted_caller = TRUE; break; }
3717 if (!trusted_caller && trusted_groups != NULL)
3719 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3721 if (trusted_groups[i] == real_gid)
3722 trusted_caller = TRUE;
3723 else for (j = 0; j < group_count; j++)
3725 if (trusted_groups[i] == group_list[j])
3726 { trusted_caller = TRUE; break; }
3728 if (trusted_caller) break;
3733 /* Handle the decoding of logging options. */
3735 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3736 log_selector_string, log_options, log_options_count, US"log", 0);
3740 debug_printf("configuration file is %s\n", config_main_filename);
3741 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3742 log_extra_selector);
3745 /* If domain literals are not allowed, check the sender address that was
3746 supplied with -f. Ditto for a stripped trailing dot. */
3748 if (sender_address != NULL)
3750 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3752 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3753 "allowed\n", sender_address);
3754 return EXIT_FAILURE;
3756 if (f_end_dot && !strip_trailing_dot)
3758 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3759 "(trailing dot not allowed)\n", sender_address);
3760 return EXIT_FAILURE;
3764 /* See if an admin user overrode our logging. */
3766 if (cmdline_syslog_name != NULL)
3770 syslog_processname = cmdline_syslog_name;
3771 log_file_path = string_copy(CUS"syslog");
3775 /* not a panic, non-privileged users should not be able to spam paniclog */
3777 "exim: you lack sufficient privilege to specify syslog process name\n");
3778 return EXIT_FAILURE;
3782 /* Paranoia check of maximum lengths of certain strings. There is a check
3783 on the length of the log file path in log.c, which will come into effect
3784 if there are any calls to write the log earlier than this. However, if we
3785 get this far but the string is very long, it is better to stop now than to
3786 carry on and (e.g.) receive a message and then have to collapse. The call to
3787 log_write() from here will cause the ultimate panic collapse if the complete
3788 file name exceeds the buffer length. */
3790 if (Ustrlen(log_file_path) > 200)
3791 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3792 "log_file_path is longer than 200 chars: aborting");
3794 if (Ustrlen(pid_file_path) > 200)
3795 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3796 "pid_file_path is longer than 200 chars: aborting");
3798 if (Ustrlen(spool_directory) > 200)
3799 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3800 "spool_directory is longer than 200 chars: aborting");
3802 /* Length check on the process name given to syslog for its TAG field,
3803 which is only permitted to be 32 characters or less. See RFC 3164. */
3805 if (Ustrlen(syslog_processname) > 32)
3806 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3807 "syslog_processname is longer than 32 chars: aborting");
3809 /* In some operating systems, the environment variable TMPDIR controls where
3810 temporary files are created; Exim doesn't use these (apart from when delivering
3811 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3812 If TMPDIR is found in the environment, reset it to the value defined in the
3813 TMPDIR macro, if this macro is defined. */
3818 for (p = USS environ; *p != NULL; p++)
3820 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3821 Ustrcmp(*p+7, TMPDIR) != 0)
3823 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3824 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3826 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3832 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3833 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3834 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3835 called by a user who has set the TZ variable. This then affects the timestamps
3836 in log files and in Received: headers, and any created Date: header lines. The
3837 required timezone is settable in the configuration file, so nothing can be done
3838 about this earlier - but hopefully nothing will normally be logged earlier than
3839 this. We have to make a new environment if TZ is wrong, but don't bother if
3840 timestamps_utc is set, because then all times are in UTC anyway. */
3842 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3844 timestamps_utc = TRUE;
3848 uschar *envtz = US getenv("TZ");
3849 if ((envtz == NULL && timezone_string != NULL) ||
3851 (timezone_string == NULL ||
3852 Ustrcmp(timezone_string, envtz) != 0)))
3854 uschar **p = USS environ;
3858 while (*p++ != NULL) count++;
3859 if (envtz == NULL) count++;
3860 newp = new = malloc(sizeof(uschar *) * (count + 1));
3861 for (p = USS environ; *p != NULL; p++)
3863 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3866 if (timezone_string != NULL)
3868 *newp = malloc(Ustrlen(timezone_string) + 4);
3869 sprintf(CS *newp++, "TZ=%s", timezone_string);
3874 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3875 tod_stamp(tod_log));
3879 /* Handle the case when we have removed the setuid privilege because of -C or
3880 -D. This means that the caller of Exim was not root.
3882 There is a problem if we were running as the Exim user. The sysadmin may
3883 expect this case to retain privilege because "the binary was called by the
3884 Exim user", but it hasn't, because either the -D option set macros, or the
3885 -C option set a non-trusted configuration file. There are two possibilities:
3887 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3888 to do message deliveries. Thus, the fact that it is running as a
3889 non-privileged user is plausible, and might be wanted in some special
3890 configurations. However, really_exim will have been set false when
3891 privilege was dropped, to stop Exim trying to write to its normal log
3892 files. Therefore, re-enable normal log processing, assuming the sysadmin
3893 has set up the log directory correctly.
3895 (2) If deliver_drop_privilege is not set, the configuration won't work as
3896 apparently intended, and so we log a panic message. In order to retain
3897 root for -C or -D, the caller must either be root or be invoking a
3898 trusted configuration file (when deliver_drop_privilege is false). */
3900 if (removed_privilege && (!trusted_config || macros != NULL) &&
3901 real_uid == exim_uid)
3903 if (deliver_drop_privilege)
3904 really_exim = TRUE; /* let logging work normally */
3906 log_write(0, LOG_MAIN|LOG_PANIC,
3907 "exim user lost privilege for using %s option",
3908 trusted_config? "-D" : "-C");
3911 /* Start up Perl interpreter if Perl support is configured and there is a
3912 perl_startup option, and the configuration or the command line specifies
3913 initializing starting. Note that the global variables are actually called
3914 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3917 if (perl_start_option != 0)
3918 opt_perl_at_start = (perl_start_option > 0);
3919 if (opt_perl_at_start && opt_perl_startup != NULL)
3922 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3923 errstr = init_perl(opt_perl_startup);
3926 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3927 return EXIT_FAILURE;
3929 opt_perl_started = TRUE;
3931 #endif /* EXIM_PERL */
3933 /* Log the arguments of the call if the configuration file said so. This is
3934 a debugging feature for finding out what arguments certain MUAs actually use.
3935 Don't attempt it if logging is disabled, or if listing variables or if
3936 verifying/testing addresses or expansions. */
3938 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3939 && really_exim && !list_options && !checking)
3942 uschar *p = big_buffer;
3944 Ustrcpy(p, "cwd= (failed)");
3945 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3947 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3949 for (i = 0; i < argc; i++)
3951 int len = Ustrlen(argv[i]);
3954 if (p + len + 8 >= big_buffer + big_buffer_size)
3957 log_write(0, LOG_MAIN, "%s", big_buffer);
3958 Ustrcpy(big_buffer, "...");
3961 printing = string_printing(argv[i]);
3962 if (printing[0] == 0) quote = US"\""; else
3964 uschar *pp = printing;
3966 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3968 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3969 (p - big_buffer) - 4), printing, quote);
3973 if ((log_extra_selector & LX_arguments) != 0)
3974 log_write(0, LOG_MAIN, "%s", big_buffer);
3976 debug_printf("%s\n", big_buffer);
3979 /* Set the working directory to be the top-level spool directory. We don't rely
3980 on this in the code, which always uses fully qualified names, but it's useful
3981 for core dumps etc. Don't complain if it fails - the spool directory might not
3982 be generally accessible and calls with the -C option (and others) have lost
3983 privilege by now. Before the chdir, we try to ensure that the directory exists.
3986 if (Uchdir(spool_directory) != 0)
3989 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3990 dummy = /* quieten compiler */ Uchdir(spool_directory);
3993 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3994 alias file. Exim doesn't have such a concept, but this call is screwed into
3995 Sun's YP makefiles. Handle this by calling a configured script, as the real
3996 user who called Exim. The -oA option can be used to pass an argument to the
4001 (void)fclose(config_file);
4002 if (bi_command != NULL)
4006 argv[i++] = bi_command;
4007 if (alias_arg != NULL) argv[i++] = alias_arg;
4010 setgroups(group_count, group_list);
4011 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4013 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4014 (argv[1] == NULL)? US"" : argv[1]);
4016 execv(CS argv[0], (char *const *)argv);
4017 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4022 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4027 /* We moved the admin/trusted check to be immediately after reading the
4028 configuration file. We leave these prints here to ensure that syslog setup,
4029 logfile setup, and so on has already happened. */
4031 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4032 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4034 /* Only an admin user may start the daemon or force a queue run in the default
4035 configuration, but the queue run restriction can be relaxed. Only an admin
4036 user may request that a message be returned to its sender forthwith. Only an
4037 admin user may specify a debug level greater than D_v (because it might show
4038 passwords, etc. in lookup queries). Only an admin user may request a queue
4039 count. Only an admin user can use the test interface to scan for email
4040 (because Exim will be in the spool dir and able to look at mails). */
4044 BOOL debugset = (debug_selector & ~D_v) != 0;
4045 if (deliver_give_up || daemon_listen || malware_test_file ||
4046 (count_queue && queue_list_requires_admin) ||
4047 (list_queue && queue_list_requires_admin) ||
4048 (queue_interval >= 0 && prod_requires_admin) ||
4049 (debugset && !running_in_test_harness))
4051 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4056 /* If the real user is not root or the exim uid, the argument for passing
4057 in an open TCP/IP connection for another message is not permitted, nor is
4058 running with the -N option for any delivery action, unless this call to exim is
4059 one that supplied an input message, or we are using a patched exim for
4060 regression testing. */
4062 if (real_uid != root_uid && real_uid != exim_uid &&
4063 (continue_hostname != NULL ||
4065 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4066 )) && !running_in_test_harness)
4068 fprintf(stderr, "exim: Permission denied\n");
4069 return EXIT_FAILURE;
4072 /* If the caller is not trusted, certain arguments are ignored when running for
4073 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4074 Note that authority for performing certain actions on messages is tested in the
4075 queue_action() function. */
4077 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4079 sender_host_name = sender_host_address = interface_address =
4080 sender_ident = received_protocol = NULL;
4081 sender_host_port = interface_port = 0;
4082 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4085 /* If a sender host address is set, extract the optional port number off the
4086 end of it and check its syntax. Do the same thing for the interface address.
4087 Exim exits if the syntax is bad. */
4091 if (sender_host_address != NULL)
4092 sender_host_port = check_port(sender_host_address);
4093 if (interface_address != NULL)
4094 interface_port = check_port(interface_address);
4097 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4102 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4103 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4107 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4108 return EXIT_FAILURE;
4112 /* If an SMTP message is being received check to see if the standard input is a
4113 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4114 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4119 union sockaddr_46 inetd_sock;
4120 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4121 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4123 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4124 if (family == AF_INET || family == AF_INET6)
4126 union sockaddr_46 interface_sock;
4127 size = sizeof(interface_sock);
4129 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4130 interface_address = host_ntoa(-1, &interface_sock, NULL,
4133 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4135 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4138 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4139 NULL, &sender_host_port);
4140 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4141 "inetd is not supported when mua_wrapper is set");
4146 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4147 return EXIT_FAILURE;
4153 /* If the load average is going to be needed while receiving a message, get it
4154 now for those OS that require the first call to os_getloadavg() to be done as
4155 root. There will be further calls later for each message received. */
4157 #ifdef LOAD_AVG_NEEDS_ROOT
4158 if (receiving_message &&
4159 (queue_only_load >= 0 ||
4160 (is_inetd && smtp_load_reserve >= 0)
4163 load_average = OS_GETLOADAVG();
4167 /* The queue_only configuration option can be overridden by -odx on the command
4168 line, except that if queue_only_override is false, queue_only cannot be unset
4169 from the command line. */
4171 if (queue_only_set && (queue_only_override || arg_queue_only))
4172 queue_only = arg_queue_only;
4174 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4177 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4178 if (arg_smtp_receive_timeout >= 0)
4179 smtp_receive_timeout = arg_smtp_receive_timeout;
4181 /* If Exim was started with root privilege, unless we have already removed the
4182 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4183 except when starting the daemon or doing some kind of delivery or address
4184 testing (-bt). These are the only cases when root need to be retained. We run
4185 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4186 retained only for starting the daemon. We always do the initgroups() in this
4187 situation (controlled by the TRUE below), in order to be as close as possible
4188 to the state Exim usually runs in. */
4190 if (!unprivileged && /* originally had root AND */
4191 !removed_privilege && /* still got root AND */
4192 !daemon_listen && /* not starting the daemon */
4193 queue_interval <= 0 && /* (either kind of daemon) */
4195 deliver_drop_privilege || /* requested unprivileged */
4197 queue_interval < 0 && /* not running the queue */
4198 (msg_action_arg < 0 || /* and */
4199 msg_action != MSG_DELIVER) && /* not delivering and */
4200 (!checking || !address_test_mode) /* not address checking */
4204 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4207 /* When we are retaining a privileged uid, we still change to the exim gid. */
4212 rv = setgid(exim_gid);
4213 /* Impact of failure is that some stuff might end up with an incorrect group.
4214 We track this for failures from root, since any attempt to change privilege
4215 by root should succeed and failures should be examined. For non-root,
4216 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4217 no need to complain then. */
4220 if (!(unprivileged || removed_privilege))
4223 "exim: changing group failed: %s\n", strerror(errno));
4227 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4228 (long int)exim_gid, strerror(errno));
4232 /* Handle a request to scan a file for malware */
4233 if (malware_test_file)
4235 #ifdef WITH_CONTENT_SCAN
4237 set_process_info("scanning file for malware");
4238 result = malware_in_file(malware_test_file);
4241 printf("No malware found.\n");
4246 printf("Malware lookup returned non-okay/fail: %d\n", result);
4250 printf("Malware found: %s\n", malware_name);
4252 printf("Malware scan detected malware of unknown name.\n");
4254 printf("Malware scanning not enabled at compile time.\n");
4259 /* Handle a request to list the delivery queue */
4263 set_process_info("listing the queue");
4264 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4268 /* Handle a request to count the delivery queue */
4272 set_process_info("counting the queue");
4277 /* Handle actions on specific messages, except for the force delivery and
4278 message load actions, which are done below. Some actions take a whole list of
4279 message ids, which are known to continue up to the end of the arguments. Others
4280 take a single message id and then operate on the recipients list. */
4282 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4284 int yield = EXIT_SUCCESS;
4285 set_process_info("acting on specified messages");
4287 if (!one_msg_action)
4289 for (i = msg_action_arg; i < argc; i++)
4290 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4291 yield = EXIT_FAILURE;
4294 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4295 recipients_arg)) yield = EXIT_FAILURE;
4299 /* We used to set up here to skip reading the ACL section, on
4300 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4301 Now, since the intro of the ${acl } expansion, ACL definitions may be
4302 needed in transports so we lost the optimisation. */
4306 /* The configuration data will have been read into POOL_PERM because we won't
4307 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4308 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4309 configuration were read into POOL_MAIN, because we don't do any resets till
4310 later on. However, it seems right, and it does ensure that both pools get used.
4313 store_pool = POOL_MAIN;
4315 /* Handle the -brt option. This is for checking out retry configurations.
4316 The next three arguments are a domain name or a complete address, and
4317 optionally two error numbers. All it does is to call the function that
4318 scans the retry configuration data. */
4320 if (test_retry_arg >= 0)
4322 retry_config *yield;
4323 int basic_errno = 0;
4327 if (test_retry_arg >= argc)
4329 printf("-brt needs a domain or address argument\n");
4330 exim_exit(EXIT_FAILURE);
4332 s1 = argv[test_retry_arg++];
4335 /* If the first argument contains no @ and no . it might be a local user
4336 or it might be a single-component name. Treat as a domain. */
4338 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4340 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4341 "being \ntreated as a one-component domain, not as a local part.\n\n",
4345 /* There may be an optional second domain arg. */
4347 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4348 s2 = argv[test_retry_arg++];
4350 /* The final arg is an error name */
4352 if (test_retry_arg < argc)
4354 uschar *ss = argv[test_retry_arg];
4356 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4359 printf("%s\n", CS error);
4360 return EXIT_FAILURE;
4363 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4364 code > 100 as an error is for matching codes to the decade. Turn them into
4365 a real error code, off the decade. */
4367 if (basic_errno == ERRNO_MAIL4XX ||
4368 basic_errno == ERRNO_RCPT4XX ||
4369 basic_errno == ERRNO_DATA4XX)
4371 int code = (more_errno >> 8) & 255;
4373 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4374 else if (code > 100)
4375 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4379 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4380 if (yield == NULL) printf("No retry information found\n"); else
4383 more_errno = yield->more_errno;
4384 printf("Retry rule: %s ", yield->pattern);
4386 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4388 printf("quota%s%s ",
4389 (more_errno > 0)? "_" : "",
4390 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4392 else if (yield->basic_errno == ECONNREFUSED)
4394 printf("refused%s%s ",
4395 (more_errno > 0)? "_" : "",
4396 (more_errno == 'M')? "MX" :
4397 (more_errno == 'A')? "A" : "");
4399 else if (yield->basic_errno == ETIMEDOUT)
4402 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4404 if (more_errno != 0) printf("_%s",
4405 (more_errno == 'M')? "MX" : "A");
4408 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4409 printf("auth_failed ");
4412 for (r = yield->rules; r != NULL; r = r->next)
4414 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4415 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4421 printf(",%d.", x/1000);
4435 exim_exit(EXIT_SUCCESS);
4438 /* Handle a request to list one or more configuration options */
4439 /* If -n was set, we suppress some information */
4443 set_process_info("listing variables");
4444 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4445 else for (i = recipients_arg; i < argc; i++)
4448 (Ustrcmp(argv[i], "router") == 0 ||
4449 Ustrcmp(argv[i], "transport") == 0 ||
4450 Ustrcmp(argv[i], "authenticator") == 0 ||
4451 Ustrcmp(argv[i], "macro") == 0))
4453 readconf_print(argv[i+1], argv[i], flag_n);
4456 else readconf_print(argv[i], NULL, flag_n);
4458 exim_exit(EXIT_SUCCESS);
4462 /* Handle a request to deliver one or more messages that are already on the
4463 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4464 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4466 Delivery of specific messages is typically used for a small number when
4467 prodding by hand (when the option forced_delivery will be set) or when
4468 re-execing to regain root privilege. Each message delivery must happen in a
4469 separate process, so we fork a process for each one, and run them sequentially
4470 so that debugging output doesn't get intertwined, and to avoid spawning too
4471 many processes if a long list is given. However, don't fork for the last one;
4472 this saves a process in the common case when Exim is called to deliver just one
4475 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4477 if (prod_requires_admin && !admin_user)
4479 fprintf(stderr, "exim: Permission denied\n");
4480 exim_exit(EXIT_FAILURE);
4482 set_process_info("delivering specified messages");
4483 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4484 for (i = msg_action_arg; i < argc; i++)
4489 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4490 else if ((pid = fork()) == 0)
4492 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4493 _exit(EXIT_SUCCESS);
4497 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4499 exim_exit(EXIT_FAILURE);
4503 exim_exit(EXIT_SUCCESS);
4507 /* If only a single queue run is requested, without SMTP listening, we can just
4508 turn into a queue runner, with an optional starting message id. */
4510 if (queue_interval == 0 && !daemon_listen)
4512 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4513 (start_queue_run_id == NULL)? US"" : US" starting at ",
4514 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4515 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4516 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4517 set_process_info("running the queue (single queue run)");
4518 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4519 exim_exit(EXIT_SUCCESS);
4523 /* Find the login name of the real user running this process. This is always
4524 needed when receiving a message, because it is written into the spool file. It
4525 may also be used to construct a from: or a sender: header, and in this case we
4526 need the user's full name as well, so save a copy of it, checked for RFC822
4527 syntax and munged if necessary, if it hasn't previously been set by the -F
4528 argument. We may try to get the passwd entry more than once, in case NIS or
4529 other delays are in evidence. Save the home directory for use in filter testing
4534 if ((pw = getpwuid(real_uid)) != NULL)
4536 originator_login = string_copy(US pw->pw_name);
4537 originator_home = string_copy(US pw->pw_dir);
4539 /* If user name has not been set by -F, set it from the passwd entry
4540 unless -f has been used to set the sender address by a trusted user. */
4542 if (originator_name == NULL)
4544 if (sender_address == NULL ||
4545 (!trusted_caller && filter_test == FTEST_NONE))
4547 uschar *name = US pw->pw_gecos;
4548 uschar *amp = Ustrchr(name, '&');
4551 /* Most Unix specify that a '&' character in the gecos field is
4552 replaced by a copy of the login name, and some even specify that
4553 the first character should be upper cased, so that's what we do. */
4558 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4559 amp - name, name, &loffset, originator_login, amp + 1);
4560 buffer[loffset] = toupper(buffer[loffset]);
4564 /* If a pattern for matching the gecos field was supplied, apply
4565 it and then expand the name string. */
4567 if (gecos_pattern != NULL && gecos_name != NULL)
4570 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4572 if (regex_match_and_setup(re, name, 0, -1))
4574 uschar *new_name = expand_string(gecos_name);
4576 if (new_name != NULL)
4578 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4579 "gecos field \"%s\"\n", new_name, name);
4582 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4583 "\"%s\": %s\n", gecos_name, expand_string_message);
4585 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4586 "gecos field \"%s\"\n", gecos_pattern, name);
4587 store_free((void *)re);
4589 originator_name = string_copy(name);
4592 /* A trusted caller has used -f but not -F */
4594 else originator_name = US"";
4597 /* Break the retry loop */
4602 if (++i > finduser_retries) break;
4606 /* If we cannot get a user login, log the incident and give up, unless the
4607 configuration specifies something to use. When running in the test harness,
4608 any setting of unknown_login overrides the actual name. */
4610 if (originator_login == NULL || running_in_test_harness)
4612 if (unknown_login != NULL)
4614 originator_login = expand_string(unknown_login);
4615 if (originator_name == NULL && unknown_username != NULL)
4616 originator_name = expand_string(unknown_username);
4617 if (originator_name == NULL) originator_name = US"";
4619 if (originator_login == NULL)
4620 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4624 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4627 originator_name = string_copy(parse_fix_phrase(originator_name,
4628 Ustrlen(originator_name), big_buffer, big_buffer_size));
4630 /* If a message is created by this call of Exim, the uid/gid of its originator
4631 are those of the caller. These values are overridden if an existing message is
4632 read in from the spool. */
4634 originator_uid = real_uid;
4635 originator_gid = real_gid;
4637 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4638 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4640 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4641 returns. We leave this till here so that the originator_ fields are available
4642 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4645 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4649 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4650 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4651 "mua_wrapper is set");
4656 /* If the sender ident has not been set (by a trusted caller) set it to
4657 the caller. This will get overwritten below for an inetd call. If a trusted
4658 caller has set it empty, unset it. */
4660 if (sender_ident == NULL) sender_ident = originator_login;
4661 else if (sender_ident[0] == 0) sender_ident = NULL;
4663 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4664 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4665 originator_* variables set. */
4667 if (test_rewrite_arg >= 0)
4669 really_exim = FALSE;
4670 if (test_rewrite_arg >= argc)
4672 printf("-brw needs an address argument\n");
4673 exim_exit(EXIT_FAILURE);
4675 rewrite_test(argv[test_rewrite_arg]);
4676 exim_exit(EXIT_SUCCESS);
4679 /* A locally-supplied message is considered to be coming from a local user
4680 unless a trusted caller supplies a sender address with -f, or is passing in the
4681 message via SMTP (inetd invocation or otherwise). */
4683 if ((sender_address == NULL && !smtp_input) ||
4684 (!trusted_caller && filter_test == FTEST_NONE))
4686 sender_local = TRUE;
4688 /* A trusted caller can supply authenticated_sender and authenticated_id
4689 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4690 defaults except when host checking. */
4692 if (authenticated_sender == NULL && !host_checking)
4693 authenticated_sender = string_sprintf("%s@%s", originator_login,
4694 qualify_domain_sender);
4695 if (authenticated_id == NULL && !host_checking)
4696 authenticated_id = originator_login;
4699 /* Trusted callers are always permitted to specify the sender address.
4700 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4701 is specified is the empty address. However, if a trusted caller does not
4702 specify a sender address for SMTP input, we leave sender_address unset. This
4703 causes the MAIL commands to be honoured. */
4705 if ((!smtp_input && sender_address == NULL) ||
4706 !receive_check_set_sender(sender_address))
4708 /* Either the caller is not permitted to set a general sender, or this is
4709 non-SMTP input and the trusted caller has not set a sender. If there is no
4710 sender, or if a sender other than <> is set, override with the originator's
4711 login (which will get qualified below), except when checking things. */
4713 if (sender_address == NULL /* No sender_address set */
4715 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4716 !checking && /* Not running tests, AND */
4717 filter_test == FTEST_NONE)) /* Not testing a filter */
4719 sender_address = originator_login;
4720 sender_address_forced = FALSE;
4721 sender_address_domain = 0;
4725 /* Remember whether an untrusted caller set the sender address */
4727 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4729 /* Ensure that the sender address is fully qualified unless it is the empty
4730 address, which indicates an error message, or doesn't exist (root caller, smtp
4731 interface, no -f argument). */
4733 if (sender_address != NULL && sender_address[0] != 0 &&
4734 sender_address_domain == 0)
4735 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4736 qualify_domain_sender);
4738 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4740 /* Handle a request to verify a list of addresses, or test them for delivery.
4741 This must follow the setting of the sender address, since routers can be
4742 predicated upon the sender. If no arguments are given, read addresses from
4743 stdin. Set debug_level to at least D_v to get full output for address testing.
4746 if (verify_address_mode || address_test_mode)
4749 int flags = vopt_qualify;
4751 if (verify_address_mode)
4753 if (!verify_as_sender) flags |= vopt_is_recipient;
4754 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4759 flags |= vopt_is_recipient;
4760 debug_selector |= D_v;
4761 debug_file = stderr;
4762 debug_fd = fileno(debug_file);
4763 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4766 if (recipients_arg < argc)
4768 while (recipients_arg < argc)
4770 uschar *s = argv[recipients_arg++];
4773 BOOL finished = FALSE;
4774 uschar *ss = parse_find_address_end(s, FALSE);
4775 if (*ss == ',') *ss = 0; else finished = TRUE;
4776 test_address(s, flags, &exit_value);
4779 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4786 uschar *s = get_stdinput(NULL, NULL);
4787 if (s == NULL) break;
4788 test_address(s, flags, &exit_value);
4792 exim_exit(exit_value);
4795 /* Handle expansion checking. Either expand items on the command line, or read
4796 from stdin if there aren't any. If -Mset was specified, load the message so
4797 that its variables can be used, but restrict this facility to admin users.
4798 Otherwise, if -bem was used, read a message from stdin. */
4802 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4804 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4807 fprintf(stderr, "exim: permission denied\n");
4810 message_id = argv[msg_action_arg];
4811 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4812 if (!spool_open_datafile(message_id))
4813 printf ("Failed to load message datafile %s\n", message_id);
4814 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4815 printf ("Failed to load message %s\n", message_id);
4818 /* Read a test message from a file. We fudge it up to be on stdin, saving
4819 stdin itself for later reading of expansion strings. */
4821 else if (expansion_test_message != NULL)
4823 int save_stdin = dup(0);
4824 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4827 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4829 return EXIT_FAILURE;
4832 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4833 message_ended = END_NOTENDED;
4834 read_message_body(receive_msg(extract_recipients));
4835 message_linecount += body_linecount;
4836 (void)dup2(save_stdin, 0);
4837 (void)close(save_stdin);
4838 clearerr(stdin); /* Required by Darwin */
4841 /* Allow $recipients for this testing */
4843 enable_dollar_recipients = TRUE;
4845 /* Expand command line items */
4847 if (recipients_arg < argc)
4849 while (recipients_arg < argc)
4851 uschar *s = argv[recipients_arg++];
4852 uschar *ss = expand_string(s);
4853 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4854 else printf("%s\n", CS ss);
4862 char *(*fn_readline)(const char *) = NULL;
4863 void (*fn_addhist)(const char *) = NULL;
4866 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4872 uschar *source = get_stdinput(fn_readline, fn_addhist);
4873 if (source == NULL) break;
4874 ss = expand_string(source);
4876 printf ("Failed: %s\n", expand_string_message);
4877 else printf("%s\n", CS ss);
4881 if (dlhandle != NULL) dlclose(dlhandle);
4885 /* The data file will be open after -Mset */
4887 if (deliver_datafile >= 0)
4889 (void)close(deliver_datafile);
4890 deliver_datafile = -1;
4893 exim_exit(EXIT_SUCCESS);
4897 /* The active host name is normally the primary host name, but it can be varied
4898 for hosts that want to play several parts at once. We need to ensure that it is
4899 set for host checking, and for receiving messages. */
4901 smtp_active_hostname = primary_hostname;
4902 if (raw_active_hostname != NULL)
4904 uschar *nah = expand_string(raw_active_hostname);
4907 if (!expand_string_forcedfail)
4908 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4909 "(smtp_active_hostname): %s", raw_active_hostname,
4910 expand_string_message);
4912 else if (nah[0] != 0) smtp_active_hostname = nah;
4915 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4916 given IP address so that the blocking and relay configuration can be tested.
4917 Unless a sender_ident was set by -oMt, we discard it (the default is the
4918 caller's login name). An RFC 1413 call is made only if we are running in the
4919 test harness and an incoming interface and both ports are specified, because
4920 there is no TCP/IP call to find the ident for. */
4927 if (!sender_ident_set)
4929 sender_ident = NULL;
4930 if (running_in_test_harness && sender_host_port != 0 &&
4931 interface_address != NULL && interface_port != 0)
4932 verify_get_ident(1413);
4935 /* In case the given address is a non-canonical IPv6 address, canonicize
4936 it. The code works for both IPv4 and IPv6, as it happens. */
4938 size = host_aton(sender_host_address, x);
4939 sender_host_address = store_get(48); /* large enough for full IPv6 */
4940 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4942 /* Now set up for testing */
4944 host_build_sender_fullhost();
4948 sender_local = FALSE;
4949 sender_host_notsocket = TRUE;
4950 debug_file = stderr;
4951 debug_fd = fileno(debug_file);
4952 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4953 "**** but without any ident (RFC 1413) callback.\n"
4954 "**** This is not for real!\n\n",
4955 sender_host_address);
4957 if (verify_check_host(&hosts_connection_nolog) == OK)
4958 log_write_selector &= ~L_smtp_connection;
4959 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4961 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4962 because a log line has already been written for all its failure exists
4963 (usually "connection refused: <reason>") and writing another one is
4964 unnecessary clutter. */
4966 if (smtp_start_session())
4968 reset_point = store_get(0);
4971 store_reset(reset_point);
4972 if (smtp_setup_msg() <= 0) break;
4973 if (!receive_msg(FALSE)) break;
4977 exim_exit(EXIT_SUCCESS);
4981 /* Arrange for message reception if recipients or SMTP were specified;
4982 otherwise complain unless a version print (-bV) happened or this is a filter
4983 verification test or info dump.
4984 In the former case, show the configuration file name. */
4986 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4988 if (version_printed)
4990 printf("Configuration file is %s\n", config_main_filename);
4991 return EXIT_SUCCESS;
4994 if (info_flag != CMDINFO_NONE)
4996 show_exim_information(info_flag, info_stdout ? stdout : stderr);
4997 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5000 if (filter_test == FTEST_NONE)
5001 exim_usage(called_as);
5005 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5006 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5007 that we are not called from inetd, because that is rejected above. The
5008 following configuration settings are forced here:
5010 (1) Synchronous delivery (-odi)
5011 (2) Errors to stderr (-oep == -oeq)
5012 (3) No parallel remote delivery
5013 (4) Unprivileged delivery
5015 We don't force overall queueing options because there are several of them;
5016 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5017 to override any SMTP queueing. */
5021 synchronous_delivery = TRUE;
5022 arg_error_handling = ERRORS_STDERR;
5023 remote_max_parallel = 1;
5024 deliver_drop_privilege = TRUE;
5026 queue_smtp_domains = NULL;
5030 /* Prepare to accept one or more new messages on the standard input. When a
5031 message has been read, its id is returned in message_id[]. If doing immediate
5032 delivery, we fork a delivery process for each received message, except for the
5033 last one, where we can save a process switch.
5035 It is only in non-smtp mode that error_handling is allowed to be changed from
5036 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5037 sendmail error modes other than -oem ever actually used? Later: yes.) */
5039 if (!smtp_input) error_handling = arg_error_handling;
5041 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5042 logging being sent down the socket and make an identd call to get the
5047 (void)fclose(stderr);
5048 exim_nullstd(); /* Re-open to /dev/null */
5049 verify_get_ident(IDENT_PORT);
5050 host_build_sender_fullhost();
5051 set_process_info("handling incoming connection from %s via inetd",
5055 /* If the sender host address has been set, build sender_fullhost if it hasn't
5056 already been done (which it will have been for inetd). This caters for the
5057 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5058 so that the test for IP options is skipped for -bs input. */
5060 if (sender_host_address != NULL && sender_fullhost == NULL)
5062 host_build_sender_fullhost();
5063 set_process_info("handling incoming connection from %s via -oMa",
5065 sender_host_notsocket = TRUE;
5068 /* Otherwise, set the sender host as unknown except for inetd calls. This
5069 prevents host checking in the case of -bs not from inetd and also for -bS. */
5071 else if (!is_inetd) sender_host_unknown = TRUE;
5073 /* If stdout does not exist, then dup stdin to stdout. This can happen
5074 if exim is started from inetd. In this case fd 0 will be set to the socket,
5075 but fd 1 will not be set. This also happens for passed SMTP channels. */
5077 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5079 /* Set up the incoming protocol name and the state of the program. Root is
5080 allowed to force received protocol via the -oMr option above. If we have come
5081 via inetd, the process info has already been set up. We don't set
5082 received_protocol here for smtp input, as it varies according to
5083 batch/HELO/EHLO/AUTH/TLS. */
5087 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5088 smtp_batched_input? "batched " : "",
5089 (sender_address!= NULL)? sender_address : originator_login);
5093 if (received_protocol == NULL)
5094 received_protocol = string_sprintf("local%s", called_as);
5095 set_process_info("accepting a local non-SMTP message from <%s>",
5099 /* Initialize the session_local_queue-only flag (this will be ignored if
5100 mua_wrapper is set) */
5103 session_local_queue_only = queue_only;
5105 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5106 the spool if so configured. On failure, we must not attempt to send an error
5107 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5108 error code is given.) */
5110 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5112 fprintf(stderr, "exim: insufficient disk space\n");
5113 return EXIT_FAILURE;
5116 /* If this is smtp input of any kind, real or batched, handle the start of the
5119 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5120 because a log line has already been written for all its failure exists
5121 (usually "connection refused: <reason>") and writing another one is
5122 unnecessary clutter. */
5128 if (verify_check_host(&hosts_connection_nolog) == OK)
5129 log_write_selector &= ~L_smtp_connection;
5130 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5131 if (!smtp_start_session())
5134 exim_exit(EXIT_SUCCESS);
5138 /* Otherwise, set up the input size limit here. */
5142 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5143 if (expand_string_message != NULL)
5145 if (thismessage_size_limit == -1)
5146 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5147 "message_size_limit: %s", expand_string_message);
5149 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5150 "message_size_limit: %s", expand_string_message);
5154 /* Loop for several messages when reading SMTP input. If we fork any child
5155 processes, we don't want to wait for them unless synchronous delivery is
5156 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5157 same as SIG_DFL, despite the fact that documentation often lists the default as
5158 "ignore". This is a confusing area. This is what I know:
5160 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5161 processes that complete simply to go away without ever becoming defunct. You
5162 can't then wait for them - but we don't want to wait for them in the
5163 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5164 happen for all OS (e.g. *BSD is different).
5166 But that's not the end of the story. Some (many? all?) systems have the
5167 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5168 has by default, so it seems that the difference is merely one of default
5169 (compare restarting vs non-restarting signals).
5171 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5172 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5173 of the loop below. Paranoia rules.
5175 February 2003: That's *still* not the end of the story. There are now versions
5176 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5177 process then calls waitpid(), a grumble is written to the system log, because
5178 this is logically inconsistent. In other words, it doesn't like the paranoia.
5179 As a consequenc of this, the waitpid() below is now excluded if we are sure
5180 that SIG_IGN works. */
5182 if (!synchronous_delivery)
5185 struct sigaction act;
5186 act.sa_handler = SIG_IGN;
5187 sigemptyset(&(act.sa_mask));
5188 act.sa_flags = SA_NOCLDWAIT;
5189 sigaction(SIGCHLD, &act, NULL);
5191 signal(SIGCHLD, SIG_IGN);
5195 /* Save the current store pool point, for resetting at the start of
5196 each message, and save the real sender address, if any. */
5198 reset_point = store_get(0);
5199 real_sender_address = sender_address;
5201 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5202 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5207 store_reset(reset_point);
5210 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5211 input and build the recipients list, before calling receive_msg() to read the
5212 message proper. Whatever sender address is given in the SMTP transaction is
5213 often ignored for local senders - we use the actual sender, which is normally
5214 either the underlying user running this process or a -f argument provided by
5215 a trusted caller. It is saved in real_sender_address. The test for whether to
5216 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5221 if ((rc = smtp_setup_msg()) > 0)
5223 if (real_sender_address != NULL &&
5224 !receive_check_set_sender(sender_address))
5226 sender_address = raw_sender = real_sender_address;
5227 sender_address_unrewritten = NULL;
5230 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5231 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5232 the very end. The result of the ACL is ignored (as for other non-SMTP
5233 messages). It is run for its potential side effects. */
5235 if (smtp_batched_input && acl_not_smtp_start != NULL)
5237 uschar *user_msg, *log_msg;
5238 enable_dollar_recipients = TRUE;
5239 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5240 &user_msg, &log_msg);
5241 enable_dollar_recipients = FALSE;
5244 /* Now get the data for the message */
5246 more = receive_msg(extract_recipients);
5247 if (message_id[0] == 0)
5250 smtp_log_no_mail(); /* Log no mail if configured */
5251 exim_exit(EXIT_FAILURE);
5256 smtp_log_no_mail(); /* Log no mail if configured */
5257 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5261 /* In the non-SMTP case, we have all the information from the command
5262 line, but must process it in case it is in the more general RFC822
5263 format, and in any case, to detect syntax errors. Also, it appears that
5264 the use of comma-separated lists as single arguments is common, so we
5265 had better support them. */
5271 int count = argc - recipients_arg;
5272 uschar **list = argv + recipients_arg;
5274 /* These options cannot be changed dynamically for non-SMTP messages */
5276 active_local_sender_retain = local_sender_retain;
5277 active_local_from_check = local_from_check;
5279 /* Save before any rewriting */
5281 raw_sender = string_copy(sender_address);
5283 /* Loop for each argument */
5285 for (i = 0; i < count; i++)
5287 int start, end, domain;
5289 uschar *s = list[i];
5291 /* Loop for each comma-separated address */
5295 BOOL finished = FALSE;
5297 uschar *ss = parse_find_address_end(s, FALSE);
5299 if (*ss == ',') *ss = 0; else finished = TRUE;
5301 /* Check max recipients - if -t was used, these aren't recipients */
5303 if (recipients_max > 0 && ++rcount > recipients_max &&
5304 !extract_recipients)
5306 if (error_handling == ERRORS_STDERR)
5308 fprintf(stderr, "exim: too many recipients\n");
5309 exim_exit(EXIT_FAILURE);
5314 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5315 errors_sender_rc : EXIT_FAILURE;
5320 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5322 if (domain == 0 && !allow_unqualified_recipient)
5325 errmess = US"unqualified recipient address not allowed";
5328 if (recipient == NULL)
5330 if (error_handling == ERRORS_STDERR)
5332 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5333 string_printing(list[i]), errmess);
5334 exim_exit(EXIT_FAILURE);
5340 eblock.text1 = string_printing(list[i]);
5341 eblock.text2 = errmess;
5343 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5344 errors_sender_rc : EXIT_FAILURE;
5348 receive_add_recipient(recipient, -1);
5351 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5355 /* Show the recipients when debugging */
5360 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5361 if (recipients_list != NULL)
5363 debug_printf("Recipients:\n");
5364 for (i = 0; i < recipients_count; i++)
5365 debug_printf(" %s\n", recipients_list[i].address);
5369 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5370 ignored; rejecting here would just add complication, and it can just as
5371 well be done later. Allow $recipients to be visible in the ACL. */
5373 if (acl_not_smtp_start != NULL)
5375 uschar *user_msg, *log_msg;
5376 enable_dollar_recipients = TRUE;
5377 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5378 &user_msg, &log_msg);
5379 enable_dollar_recipients = FALSE;
5382 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5383 will just read the headers for the message, and not write anything onto the
5386 message_ended = END_NOTENDED;
5387 more = receive_msg(extract_recipients);
5389 /* more is always FALSE here (not SMTP message) when reading a message
5390 for real; when reading the headers of a message for filter testing,
5391 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5393 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5394 } /* Non-SMTP message reception */
5396 /* If this is a filter testing run, there are headers in store, but
5397 no message on the spool. Run the filtering code in testing mode, setting
5398 the domain to the qualify domain and the local part to the current user,
5399 unless they have been set by options. The prefix and suffix are left unset
5400 unless specified. The the return path is set to to the sender unless it has
5401 already been set from a return-path header in the message. */
5403 if (filter_test != FTEST_NONE)
5405 deliver_domain = (ftest_domain != NULL)?
5406 ftest_domain : qualify_domain_recipient;
5407 deliver_domain_orig = deliver_domain;
5408 deliver_localpart = (ftest_localpart != NULL)?
5409 ftest_localpart : originator_login;
5410 deliver_localpart_orig = deliver_localpart;
5411 deliver_localpart_prefix = ftest_prefix;
5412 deliver_localpart_suffix = ftest_suffix;
5413 deliver_home = originator_home;
5415 if (return_path == NULL)
5417 printf("Return-path copied from sender\n");
5418 return_path = string_copy(sender_address);
5422 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5424 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5426 receive_add_recipient(
5427 string_sprintf("%s%s%s@%s",
5428 (ftest_prefix == NULL)? US"" : ftest_prefix,
5430 (ftest_suffix == NULL)? US"" : ftest_suffix,
5431 deliver_domain), -1);
5433 printf("Recipient = %s\n", recipients_list[0].address);
5434 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5435 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5437 if (chdir("/")) /* Get away from wherever the user is running this from */
5439 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5440 exim_exit(EXIT_FAILURE);
5443 /* Now we run either a system filter test, or a user filter test, or both.
5444 In the latter case, headers added by the system filter will persist and be
5445 available to the user filter. We need to copy the filter variables
5448 if ((filter_test & FTEST_SYSTEM) != 0)
5450 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5451 exim_exit(EXIT_FAILURE);
5454 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5456 if ((filter_test & FTEST_USER) != 0)
5458 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5459 exim_exit(EXIT_FAILURE);
5462 exim_exit(EXIT_SUCCESS);
5465 /* Else act on the result of message reception. We should not get here unless
5466 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5467 will be TRUE. If it is not, check on the number of messages received in this
5470 if (!session_local_queue_only &&
5471 smtp_accept_queue_per_connection > 0 &&
5472 receive_messagecount > smtp_accept_queue_per_connection)
5474 session_local_queue_only = TRUE;
5475 queue_only_reason = 2;
5478 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5479 and queue_only_load is set, check that the load average is below it. If it is
5480 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5481 default), we put the whole session into queue_only mode. It then remains this
5482 way for any subsequent messages on the same SMTP connection. This is a
5483 deliberate choice; even though the load average may fall, it doesn't seem
5484 right to deliver later messages on the same call when not delivering earlier
5485 ones. However, there are odd cases where this is not wanted, so this can be
5486 changed by setting queue_only_load_latch false. */
5488 local_queue_only = session_local_queue_only;
5489 if (!local_queue_only && queue_only_load >= 0)
5491 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5492 if (local_queue_only)
5494 queue_only_reason = 3;
5495 if (queue_only_load_latch) session_local_queue_only = TRUE;
5499 /* If running as an MUA wrapper, all queueing options and freezing options
5503 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5505 /* Log the queueing here, when it will get a message id attached, but
5506 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5509 if (local_queue_only) switch(queue_only_reason)
5512 log_write(L_delay_delivery,
5513 LOG_MAIN, "no immediate delivery: more than %d messages "
5514 "received in one connection", smtp_accept_queue_per_connection);
5518 log_write(L_delay_delivery,
5519 LOG_MAIN, "no immediate delivery: load average %.2f",
5520 (double)load_average/1000.0);
5524 /* Else do the delivery unless the ACL or local_scan() called for queue only
5525 or froze the message. Always deliver in a separate process. A fork failure is
5526 not a disaster, as the delivery will eventually happen on a subsequent queue
5527 run. The search cache must be tidied before the fork, as the parent will
5528 do it before exiting. The child will trigger a lookup failure and
5529 thereby defer the delivery if it tries to use (for example) a cached ldap
5530 connection that the parent has called unbind on. */
5532 else if (!queue_only_policy && !deliver_freeze)
5537 if ((pid = fork()) == 0)
5540 close_unwanted(); /* Close unwanted file descriptors and TLS */
5541 exim_nullstd(); /* Ensure std{in,out,err} exist */
5543 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5544 mode, deliver_drop_privilege is forced TRUE). */
5546 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5548 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5550 /* Control does not return here. */
5553 /* No need to re-exec */
5555 rc = deliver_message(message_id, FALSE, FALSE);
5557 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5558 EXIT_SUCCESS : EXIT_FAILURE);
5563 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5564 "process: %s", strerror(errno));
5567 /* In the parent, wait if synchronous delivery is required. This will
5568 always be the case in MUA wrapper mode. */
5570 else if (synchronous_delivery)
5573 while (wait(&status) != pid);
5574 if ((status & 0x00ff) != 0)
5575 log_write(0, LOG_MAIN|LOG_PANIC,
5576 "process %d crashed with signal %d while delivering %s",
5577 (int)pid, status & 0x00ff, message_id);
5578 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5582 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5583 automatically reaps children (see comments above the loop), clear away any
5584 finished subprocesses here, in case there are lots of messages coming in
5585 from the same source. */
5587 #ifndef SIG_IGN_WORKS
5588 while (waitpid(-1, NULL, WNOHANG) > 0);
5592 exim_exit(EXIT_SUCCESS); /* Never returns */
5593 return 0; /* To stop compiler warning */