1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
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(FALSE, 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_TPDA
829 fprintf(f, " Experimental_TPDA");
831 #ifdef EXPERIMENTAL_REDIS
832 fprintf(f, " Experimental_Redis");
836 fprintf(f, "Lookups (built-in):");
837 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
838 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
840 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
843 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
844 fprintf(f, " dbm dbmjz dbmnz");
846 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
847 fprintf(f, " dnsdb");
849 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
850 fprintf(f, " dsearch");
852 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
853 fprintf(f, " ibase");
855 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
856 fprintf(f, " ldap ldapdn ldapm");
858 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
859 fprintf(f, " mysql");
861 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
862 fprintf(f, " nis nis0");
864 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
865 fprintf(f, " nisplus");
867 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
868 fprintf(f, " oracle");
870 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
871 fprintf(f, " passwd");
873 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
874 fprintf(f, " pgsql");
876 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
877 fprintf(f, " sqlite");
879 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
880 fprintf(f, " testdb");
882 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
883 fprintf(f, " whoson");
887 fprintf(f, "Authenticators:");
889 fprintf(f, " cram_md5");
891 #ifdef AUTH_CYRUS_SASL
892 fprintf(f, " cyrus_sasl");
895 fprintf(f, " dovecot");
898 fprintf(f, " gsasl");
900 #ifdef AUTH_HEIMDAL_GSSAPI
901 fprintf(f, " heimdal_gssapi");
903 #ifdef AUTH_PLAINTEXT
904 fprintf(f, " plaintext");
911 fprintf(f, "Routers:");
913 fprintf(f, " accept");
915 #ifdef ROUTER_DNSLOOKUP
916 fprintf(f, " dnslookup");
918 #ifdef ROUTER_IPLITERAL
919 fprintf(f, " ipliteral");
921 #ifdef ROUTER_IPLOOKUP
922 fprintf(f, " iplookup");
924 #ifdef ROUTER_MANUALROUTE
925 fprintf(f, " manualroute");
927 #ifdef ROUTER_QUERYPROGRAM
928 fprintf(f, " queryprogram");
930 #ifdef ROUTER_REDIRECT
931 fprintf(f, " redirect");
935 fprintf(f, "Transports:");
936 #ifdef TRANSPORT_APPENDFILE
937 fprintf(f, " appendfile");
938 #ifdef SUPPORT_MAILDIR
939 fprintf(f, "/maildir");
941 #ifdef SUPPORT_MAILSTORE
942 fprintf(f, "/mailstore");
948 #ifdef TRANSPORT_AUTOREPLY
949 fprintf(f, " autoreply");
951 #ifdef TRANSPORT_LMTP
954 #ifdef TRANSPORT_PIPE
957 #ifdef TRANSPORT_SMTP
962 if (fixed_never_users[0] > 0)
965 fprintf(f, "Fixed never_users: ");
966 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
967 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
968 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
971 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
973 /* Everything else is details which are only worth reporting when debugging.
974 Perhaps the tls_version_report should move into this too. */
979 /* clang defines __GNUC__ (at least, for me) so test for it first */
980 #if defined(__clang__)
981 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
982 #elif defined(__GNUC__)
983 fprintf(f, "Compiler: GCC [%s]\n",
987 "? unknown version ?"
991 fprintf(f, "Compiler: <unknown>\n");
995 tls_version_report(f);
998 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
999 if (authi->version_report) {
1000 (*authi->version_report)(f);
1004 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1005 characters; unless it's an ancient version of PCRE in which case it
1007 #ifndef PCRE_PRERELEASE
1008 #define PCRE_PRERELEASE
1011 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1012 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1014 PCRE_MAJOR, PCRE_MINOR,
1015 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1018 #undef EXPAND_AND_QUOTE
1021 for (i = 0; i < lookup_list_count; i++)
1023 if (lookup_list[i]->version_report)
1024 lookup_list[i]->version_report(f);
1027 #ifdef WHITELIST_D_MACROS
1028 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1030 fprintf(f, "WHITELIST_D_MACROS unset\n");
1032 #ifdef TRUSTED_CONFIG_LIST
1033 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1035 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1042 /*************************************************
1043 * Show auxiliary information about Exim *
1044 *************************************************/
1047 show_exim_information(enum commandline_info request, FILE *stream)
1054 fprintf(stream, "Oops, something went wrong.\n");
1058 "The -bI: flag takes a string indicating which information to provide.\n"
1059 "If the string is not recognised, you'll get this help (on stderr).\n"
1061 " exim -bI:help this information\n"
1062 " exim -bI:dscp dscp value keywords known\n"
1063 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1067 for (pp = exim_sieve_extension_list; *pp; ++pp)
1068 fprintf(stream, "%s\n", *pp);
1071 dscp_list_to_stream(stream);
1077 /*************************************************
1078 * Quote a local part *
1079 *************************************************/
1081 /* This function is used when a sender address or a From: or Sender: header
1082 line is being created from the caller's login, or from an authenticated_id. It
1083 applies appropriate quoting rules for a local part.
1085 Argument: the local part
1086 Returns: the local part, quoted if necessary
1090 local_part_quote(uschar *lpart)
1092 BOOL needs_quote = FALSE;
1097 for (t = lpart; !needs_quote && *t != 0; t++)
1099 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1100 (*t != '.' || t == lpart || t[1] == 0);
1103 if (!needs_quote) return lpart;
1106 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1110 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1113 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1116 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1117 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1118 yield = string_cat(yield, &size, &ptr, nq, 1);
1122 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1130 /*************************************************
1131 * Load readline() functions *
1132 *************************************************/
1134 /* This function is called from testing executions that read data from stdin,
1135 but only when running as the calling user. Currently, only -be does this. The
1136 function loads the readline() function library and passes back the functions.
1137 On some systems, it needs the curses library, so load that too, but try without
1138 it if loading fails. All this functionality has to be requested at build time.
1141 fn_readline_ptr pointer to where to put the readline pointer
1142 fn_addhist_ptr pointer to where to put the addhistory function
1144 Returns: the dlopen handle or NULL on failure
1148 set_readline(char * (**fn_readline_ptr)(const char *),
1149 void (**fn_addhist_ptr)(const char *))
1152 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1154 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1155 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1157 if (dlhandle != NULL)
1159 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1160 * char * readline (const char *prompt);
1161 * void add_history (const char *string);
1163 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1164 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1168 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1177 /*************************************************
1178 * Get a line from stdin for testing things *
1179 *************************************************/
1181 /* This function is called when running tests that can take a number of lines
1182 of input (for example, -be and -bt). It handles continuations and trailing
1183 spaces. And prompting and a blank line output on eof. If readline() is in use,
1184 the arguments are non-NULL and provide the relevant functions.
1187 fn_readline readline function or NULL
1188 fn_addhist addhist function or NULL
1190 Returns: pointer to dynamic memory, or NULL at end of file
1194 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1199 uschar *yield = NULL;
1201 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1205 uschar buffer[1024];
1209 char *readline_line = NULL;
1210 if (fn_readline != NULL)
1212 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1213 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1214 p = US readline_line;
1219 /* readline() not in use */
1222 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1226 /* Handle the line */
1228 ss = p + (int)Ustrlen(p);
1229 while (ss > p && isspace(ss[-1])) ss--;
1233 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1236 yield = string_cat(yield, &size, &ptr, p, ss - p);
1239 if (fn_readline != NULL) free(readline_line);
1242 if (ss == p || yield[ptr-1] != '\\')
1250 if (yield == NULL) printf("\n");
1256 /*************************************************
1257 * Output usage information for the program *
1258 *************************************************/
1260 /* This function is called when there are no recipients
1261 or a specific --help argument was added.
1264 progname information on what name we were called by
1266 Returns: DOES NOT RETURN
1270 exim_usage(uschar *progname)
1273 /* Handle specific program invocation varients */
1274 if (Ustrcmp(progname, US"-mailq") == 0)
1277 "mailq - list the contents of the mail queue\n\n"
1278 "For a list of options, see the Exim documentation.\n");
1282 /* Generic usage - we output this whatever happens */
1284 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1285 "not directly from a shell command line. Options and/or arguments control\n"
1286 "what it does when called. For a list of options, see the Exim documentation.\n");
1293 /*************************************************
1294 * Validate that the macros given are okay *
1295 *************************************************/
1297 /* Typically, Exim will drop privileges if macros are supplied. In some
1298 cases, we want to not do so.
1300 Arguments: none (macros is a global)
1301 Returns: true if trusted, false otherwise
1305 macros_trusted(void)
1307 #ifdef WHITELIST_D_MACROS
1309 uschar *whitelisted, *end, *p, **whites, **w;
1310 int white_count, i, n;
1312 BOOL prev_char_item, found;
1317 #ifndef WHITELIST_D_MACROS
1321 /* We only trust -D overrides for some invoking users:
1322 root, the exim run-time user, the optional config owner user.
1323 I don't know why config-owner would be needed, but since they can own the
1324 config files anyway, there's no security risk to letting them override -D. */
1325 if ( ! ((real_uid == root_uid)
1326 || (real_uid == exim_uid)
1327 #ifdef CONFIGURE_OWNER
1328 || (real_uid == config_uid)
1332 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1336 /* Get a list of macros which are whitelisted */
1337 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1338 prev_char_item = FALSE;
1340 for (p = whitelisted; *p != '\0'; ++p)
1342 if (*p == ':' || isspace(*p))
1347 prev_char_item = FALSE;
1350 if (!prev_char_item)
1351 prev_char_item = TRUE;
1358 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1359 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1364 if (i == white_count)
1366 while (*p != '\0' && p < end)
1372 /* The list of macros should be very short. Accept the N*M complexity. */
1373 for (m = macros; m != NULL; m = m->next)
1376 for (w = whites; *w; ++w)
1377 if (Ustrcmp(*w, m->name) == 0)
1384 if (m->replacement == NULL)
1386 len = Ustrlen(m->replacement);
1389 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1390 0, PCRE_EOPT, NULL, 0);
1393 if (n != PCRE_ERROR_NOMATCH)
1394 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1398 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1404 /*************************************************
1405 * Entry point and high-level code *
1406 *************************************************/
1408 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1409 the appropriate action. All the necessary functions are present in the one
1410 binary. I originally thought one should split it up, but it turns out that so
1411 much of the apparatus is needed in each chunk that one might as well just have
1412 it all available all the time, which then makes the coding easier as well.
1415 argc count of entries in argv
1416 argv argument strings, with argv[0] being the program name
1418 Returns: EXIT_SUCCESS if terminated successfully
1419 EXIT_FAILURE otherwise, except when a message has been sent
1420 to the sender, and -oee was given
1424 main(int argc, char **cargv)
1426 uschar **argv = USS cargv;
1427 int arg_receive_timeout = -1;
1428 int arg_smtp_receive_timeout = -1;
1429 int arg_error_handling = error_handling;
1430 int filter_sfd = -1;
1431 int filter_ufd = -1;
1434 int list_queue_option = 0;
1436 int msg_action_arg = -1;
1437 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1438 int queue_only_reason = 0;
1440 int perl_start_option = 0;
1442 int recipients_arg = argc;
1443 int sender_address_domain = 0;
1444 int test_retry_arg = -1;
1445 int test_rewrite_arg = -1;
1446 BOOL arg_queue_only = FALSE;
1447 BOOL bi_option = FALSE;
1448 BOOL checking = FALSE;
1449 BOOL count_queue = FALSE;
1450 BOOL expansion_test = FALSE;
1451 BOOL extract_recipients = FALSE;
1452 BOOL flag_G = FALSE;
1453 BOOL flag_n = FALSE;
1454 BOOL forced_delivery = FALSE;
1455 BOOL f_end_dot = FALSE;
1456 BOOL deliver_give_up = FALSE;
1457 BOOL list_queue = FALSE;
1458 BOOL list_options = FALSE;
1459 BOOL local_queue_only;
1461 BOOL one_msg_action = FALSE;
1462 BOOL queue_only_set = FALSE;
1463 BOOL receiving_message = TRUE;
1464 BOOL sender_ident_set = FALSE;
1465 BOOL session_local_queue_only;
1467 BOOL removed_privilege = FALSE;
1468 BOOL usage_wanted = FALSE;
1469 BOOL verify_address_mode = FALSE;
1470 BOOL verify_as_sender = FALSE;
1471 BOOL version_printed = FALSE;
1472 uschar *alias_arg = NULL;
1473 uschar *called_as = US"";
1474 uschar *cmdline_syslog_name = NULL;
1475 uschar *start_queue_run_id = NULL;
1476 uschar *stop_queue_run_id = NULL;
1477 uschar *expansion_test_message = NULL;
1478 uschar *ftest_domain = NULL;
1479 uschar *ftest_localpart = NULL;
1480 uschar *ftest_prefix = NULL;
1481 uschar *ftest_suffix = NULL;
1482 uschar *malware_test_file = NULL;
1483 uschar *real_sender_address;
1484 uschar *originator_home = US"/";
1489 struct stat statbuf;
1490 pid_t passed_qr_pid = (pid_t)0;
1491 int passed_qr_pipe = -1;
1492 gid_t group_list[NGROUPS_MAX];
1494 /* For the -bI: flag */
1495 enum commandline_info info_flag = CMDINFO_NONE;
1496 BOOL info_stdout = FALSE;
1498 /* Possible options for -R and -S */
1500 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1502 /* Need to define this in case we need to change the environment in order
1503 to get rid of a bogus time zone. We have to make it char rather than uschar
1504 because some OS define it in /usr/include/unistd.h. */
1506 extern char **environ;
1508 /* If the Exim user and/or group and/or the configuration file owner/group were
1509 defined by ref:name at build time, we must now find the actual uid/gid values.
1510 This is a feature to make the lives of binary distributors easier. */
1512 #ifdef EXIM_USERNAME
1513 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1517 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1521 /* If ref:name uses a number as the name, route_finduser() returns
1522 TRUE with exim_uid set and pw coerced to NULL. */
1524 exim_gid = pw->pw_gid;
1525 #ifndef EXIM_GROUPNAME
1529 "exim: ref:name should specify a usercode, not a group.\n"
1530 "exim: can't let you get away with it unless you also specify a group.\n");
1537 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1543 #ifdef EXIM_GROUPNAME
1544 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1546 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1552 #ifdef CONFIGURE_OWNERNAME
1553 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1555 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1556 CONFIGURE_OWNERNAME);
1561 /* We default the system_filter_user to be the Exim run-time user, as a
1562 sane non-root value. */
1563 system_filter_uid = exim_uid;
1565 #ifdef CONFIGURE_GROUPNAME
1566 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1568 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1569 CONFIGURE_GROUPNAME);
1574 /* In the Cygwin environment, some initialization needs doing. It is fudged
1575 in by means of this macro. */
1581 /* Check a field which is patched when we are running Exim within its
1582 testing harness; do a fast initial check, and then the whole thing. */
1584 running_in_test_harness =
1585 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1587 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1588 at the start of a program; however, it seems that some environments do not
1589 follow this. A "strange" locale can affect the formatting of timestamps, so we
1592 setlocale(LC_ALL, "C");
1594 /* Set up the default handler for timing using alarm(). */
1596 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1598 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1599 because store_malloc writes a log entry on failure. */
1601 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1602 if (log_buffer == NULL)
1604 fprintf(stderr, "exim: failed to get store for log buffer\n");
1608 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1609 NULL when the daemon is run and the file is closed. We have to use this
1610 indirection, because some systems don't allow writing to the variable "stderr".
1613 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1615 /* Arrange for the PCRE regex library to use our store functions. Note that
1616 the normal calls are actually macros that add additional arguments for
1617 debugging purposes so we have to assign specially constructed functions here.
1618 The default is to use store in the stacking pool, but this is overridden in the
1619 regex_must_compile() function. */
1621 pcre_malloc = function_store_get;
1622 pcre_free = function_dummy_free;
1624 /* Ensure there is a big buffer for temporary use in several places. It is put
1625 in malloc store so that it can be freed for enlargement if necessary. */
1627 big_buffer = store_malloc(big_buffer_size);
1629 /* Set up the handler for the data request signal, and set the initial
1630 descriptive text. */
1632 set_process_info("initializing");
1633 os_restarting_signal(SIGUSR1, usr1_handler);
1635 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1636 in the daemon code. For the rest of Exim's uses, we ignore it. */
1638 signal(SIGHUP, SIG_IGN);
1640 /* We don't want to die on pipe errors as the code is written to handle
1641 the write error instead. */
1643 signal(SIGPIPE, SIG_IGN);
1645 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1646 set to SIG_IGN. This causes subprocesses that complete before the parent
1647 process waits for them not to hang around, so when Exim calls wait(), nothing
1648 is there. The wait() code has been made robust against this, but let's ensure
1649 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1650 ending status. We use sigaction rather than plain signal() on those OS where
1651 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1652 problem on AIX with this.) */
1656 struct sigaction act;
1657 act.sa_handler = SIG_DFL;
1658 sigemptyset(&(act.sa_mask));
1660 sigaction(SIGCHLD, &act, NULL);
1663 signal(SIGCHLD, SIG_DFL);
1666 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1671 /* Set up the version number. Set up the leading 'E' for the external form of
1672 message ids, set the pointer to the internal form, and initialize it to
1673 indicate no message being processed. */
1676 message_id_option[0] = '-';
1677 message_id_external = message_id_option + 1;
1678 message_id_external[0] = 'E';
1679 message_id = message_id_external + 1;
1682 /* Set the umask to zero so that any files Exim creates using open() are
1683 created with the modes that it specifies. NOTE: Files created with fopen() have
1684 a problem, which was not recognized till rather late (February 2006). With this
1685 umask, such files will be world writeable. (They are all content scanning files
1686 in the spool directory, which isn't world-accessible, so this is not a
1687 disaster, but it's untidy.) I don't want to change this overall setting,
1688 however, because it will interact badly with the open() calls. Instead, there's
1689 now a function called modefopen() that fiddles with the umask while calling
1694 /* Precompile the regular expression for matching a message id. Keep this in
1695 step with the code that generates ids in the accept.c module. We need to do
1696 this here, because the -M options check their arguments for syntactic validity
1697 using mac_ismsgid, which uses this. */
1700 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1702 /* Precompile the regular expression that is used for matching an SMTP error
1703 code, possibly extended, at the start of an error message. Note that the
1704 terminating whitespace character is included. */
1707 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1710 #ifdef WHITELIST_D_MACROS
1711 /* Precompile the regular expression used to filter the content of macros
1712 given to -D for permissibility. */
1714 regex_whitelisted_macro =
1715 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1719 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1720 this seems to be a generally accepted convention, since one finds symbolic
1721 links called "mailq" in standard OS configurations. */
1723 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1724 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1727 receiving_message = FALSE;
1728 called_as = US"-mailq";
1731 /* If the program is called as "rmail" treat it as equivalent to
1732 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1733 i.e. preventing a single dot on a line from terminating the message, and
1734 returning with zero return code, even in cases of error (provided an error
1735 message has been sent). */
1737 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1738 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1741 called_as = US"-rmail";
1742 errors_sender_rc = EXIT_SUCCESS;
1745 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1746 this is a smail convention. */
1748 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1749 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1751 smtp_input = smtp_batched_input = TRUE;
1752 called_as = US"-rsmtp";
1755 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1756 this is a smail convention. */
1758 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1759 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1762 receiving_message = FALSE;
1763 called_as = US"-runq";
1766 /* If the program is called as "newaliases" treat it as equivalent to
1767 "exim -bi"; this is a sendmail convention. */
1769 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1770 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1773 receiving_message = FALSE;
1774 called_as = US"-newaliases";
1777 /* Save the original effective uid for a couple of uses later. It should
1778 normally be root, but in some esoteric environments it may not be. */
1780 original_euid = geteuid();
1782 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1783 to be the same as the real ones. This makes a difference only if Exim is setuid
1784 (or setgid) to something other than root, which could be the case in some
1785 special configurations. */
1787 real_uid = getuid();
1788 real_gid = getgid();
1790 if (real_uid == root_uid)
1792 rv = setgid(real_gid);
1795 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1796 (long int)real_gid, strerror(errno));
1799 rv = setuid(real_uid);
1802 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1803 (long int)real_uid, strerror(errno));
1808 /* If neither the original real uid nor the original euid was root, Exim is
1809 running in an unprivileged state. */
1811 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1813 /* Scan the program's arguments. Some can be dealt with right away; others are
1814 simply recorded for checking and handling afterwards. Do a high-level switch
1815 on the second character (the one after '-'), to save some effort. */
1817 for (i = 1; i < argc; i++)
1819 BOOL badarg = FALSE;
1820 uschar *arg = argv[i];
1824 /* An argument not starting with '-' is the start of a recipients list;
1825 break out of the options-scanning loop. */
1833 /* An option consistion of -- terminates the options */
1835 if (Ustrcmp(arg, "--") == 0)
1837 recipients_arg = i + 1;
1841 /* Handle flagged options */
1843 switchchar = arg[1];
1846 /* Make all -ex options synonymous with -oex arguments, since that
1847 is assumed by various callers. Also make -qR options synonymous with -R
1848 options, as that seems to be required as well. Allow for -qqR too, and
1849 the same for -S options. */
1851 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1852 Ustrncmp(arg+1, "qR", 2) == 0 ||
1853 Ustrncmp(arg+1, "qS", 2) == 0)
1855 switchchar = arg[2];
1858 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1860 switchchar = arg[3];
1862 queue_2stage = TRUE;
1865 /* Make -r synonymous with -f, since it is a documented alias */
1867 else if (arg[1] == 'r') switchchar = 'f';
1869 /* Make -ov synonymous with -v */
1871 else if (Ustrcmp(arg, "-ov") == 0)
1877 /* deal with --option_aliases */
1878 else if (switchchar == '-')
1880 if (Ustrcmp(argrest, "help") == 0)
1882 usage_wanted = TRUE;
1885 else if (Ustrcmp(argrest, "version") == 0)
1892 /* High-level switch on active initial letter */
1897 /* sendmail uses -Ac and -Am to control which .cf file is used;
1900 if (*argrest == '\0') { badarg = TRUE; break; }
1903 BOOL ignore = FALSE;
1908 if (*(argrest + 1) == '\0')
1912 if (!ignore) { badarg = TRUE; break; }
1916 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1917 so has no need of it. */
1920 if (*argrest == 0) i++; /* Skip over the type */
1925 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1927 /* -bd: Run in daemon mode, awaiting SMTP connections.
1928 -bdf: Ditto, but in the foreground.
1931 if (*argrest == 'd')
1933 daemon_listen = TRUE;
1934 if (*(++argrest) == 'f') background_daemon = FALSE;
1935 else if (*argrest != 0) { badarg = TRUE; break; }
1938 /* -be: Run in expansion test mode
1939 -bem: Ditto, but read a message from a file first
1942 else if (*argrest == 'e')
1944 expansion_test = checking = TRUE;
1945 if (argrest[1] == 'm')
1947 if (++i >= argc) { badarg = TRUE; break; }
1948 expansion_test_message = argv[i];
1951 if (argrest[1] != 0) { badarg = TRUE; break; }
1954 /* -bF: Run system filter test */
1956 else if (*argrest == 'F')
1958 filter_test |= FTEST_SYSTEM;
1959 if (*(++argrest) != 0) { badarg = TRUE; break; }
1960 if (++i < argc) filter_test_sfile = argv[i]; else
1962 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1967 /* -bf: Run user filter test
1968 -bfd: Set domain for filter testing
1969 -bfl: Set local part for filter testing
1970 -bfp: Set prefix for filter testing
1971 -bfs: Set suffix for filter testing
1974 else if (*argrest == 'f')
1976 if (*(++argrest) == 0)
1978 filter_test |= FTEST_USER;
1979 if (++i < argc) filter_test_ufile = argv[i]; else
1981 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1989 fprintf(stderr, "exim: string expected after %s\n", arg);
1992 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1993 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1994 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1995 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1996 else { badarg = TRUE; break; }
2000 /* -bh: Host checking - an IP address must follow. */
2002 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2004 if (++i >= argc) { badarg = TRUE; break; }
2005 sender_host_address = argv[i];
2006 host_checking = checking = log_testing_mode = TRUE;
2007 host_checking_callout = argrest[1] == 'c';
2010 /* -bi: This option is used by sendmail to initialize *the* alias file,
2011 though it has the -oA option to specify a different file. Exim has no
2012 concept of *the* alias file, but since Sun's YP make script calls
2013 sendmail this way, some support must be provided. */
2015 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2017 /* -bI: provide information, of the type to follow after a colon.
2018 This is an Exim flag. */
2020 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2022 uschar *p = &argrest[2];
2023 info_flag = CMDINFO_HELP;
2026 if (strcmpic(p, CUS"sieve") == 0)
2028 info_flag = CMDINFO_SIEVE;
2031 else if (strcmpic(p, CUS"dscp") == 0)
2033 info_flag = CMDINFO_DSCP;
2036 else if (strcmpic(p, CUS"help") == 0)
2043 /* -bm: Accept and deliver message - the default option. Reinstate
2044 receiving_message, which got turned off for all -b options. */
2046 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2048 /* -bmalware: test the filename given for malware */
2050 else if (Ustrcmp(argrest, "malware") == 0)
2052 if (++i >= argc) { badarg = TRUE; break; }
2053 malware_test_file = argv[i];
2056 /* -bnq: For locally originating messages, do not qualify unqualified
2057 addresses. In the envelope, this causes errors; in header lines they
2060 else if (Ustrcmp(argrest, "nq") == 0)
2062 allow_unqualified_sender = FALSE;
2063 allow_unqualified_recipient = FALSE;
2066 /* -bpxx: List the contents of the mail queue, in various forms. If
2067 the option is -bpc, just a queue count is needed. Otherwise, if the
2068 first letter after p is r, then order is random. */
2070 else if (*argrest == 'p')
2072 if (*(++argrest) == 'c')
2075 if (*(++argrest) != 0) badarg = TRUE;
2079 if (*argrest == 'r')
2081 list_queue_option = 8;
2084 else list_queue_option = 0;
2088 /* -bp: List the contents of the mail queue, top-level only */
2090 if (*argrest == 0) {}
2092 /* -bpu: List the contents of the mail queue, top-level undelivered */
2094 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2096 /* -bpa: List the contents of the mail queue, including all delivered */
2098 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2100 /* Unknown after -bp[r] */
2110 /* -bP: List the configuration variables given as the address list.
2111 Force -v, so configuration errors get displayed. */
2113 else if (Ustrcmp(argrest, "P") == 0)
2115 list_options = TRUE;
2116 debug_selector |= D_v;
2117 debug_file = stderr;
2120 /* -brt: Test retry configuration lookup */
2122 else if (Ustrcmp(argrest, "rt") == 0)
2124 test_retry_arg = i + 1;
2128 /* -brw: Test rewrite configuration */
2130 else if (Ustrcmp(argrest, "rw") == 0)
2132 test_rewrite_arg = i + 1;
2136 /* -bS: Read SMTP commands on standard input, but produce no replies -
2137 all errors are reported by sending messages. */
2139 else if (Ustrcmp(argrest, "S") == 0)
2140 smtp_input = smtp_batched_input = receiving_message = TRUE;
2142 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2143 on standard output. */
2145 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2147 /* -bt: address testing mode */
2149 else if (Ustrcmp(argrest, "t") == 0)
2150 address_test_mode = checking = log_testing_mode = TRUE;
2152 /* -bv: verify addresses */
2154 else if (Ustrcmp(argrest, "v") == 0)
2155 verify_address_mode = checking = log_testing_mode = TRUE;
2157 /* -bvs: verify sender addresses */
2159 else if (Ustrcmp(argrest, "vs") == 0)
2161 verify_address_mode = checking = log_testing_mode = TRUE;
2162 verify_as_sender = TRUE;
2165 /* -bV: Print version string and support details */
2167 else if (Ustrcmp(argrest, "V") == 0)
2169 printf("Exim version %s #%s built %s\n", version_string,
2170 version_cnumber, version_date);
2171 printf("%s\n", CS version_copyright);
2172 version_printed = TRUE;
2173 show_whats_supported(stdout);
2176 /* -bw: inetd wait mode, accept a listening socket as stdin */
2178 else if (*argrest == 'w')
2180 inetd_wait_mode = TRUE;
2181 background_daemon = FALSE;
2182 daemon_listen = TRUE;
2183 if (*(++argrest) != '\0')
2185 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2186 if (inetd_wait_timeout <= 0)
2188 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2198 /* -C: change configuration file list; ignore if it isn't really
2199 a change! Enforce a prefix check if required. */
2204 if(++i < argc) argrest = argv[i]; else
2205 { badarg = TRUE; break; }
2207 if (Ustrcmp(config_main_filelist, argrest) != 0)
2209 #ifdef ALT_CONFIG_PREFIX
2211 int len = Ustrlen(ALT_CONFIG_PREFIX);
2212 uschar *list = argrest;
2214 while((filename = string_nextinlist(&list, &sep, big_buffer,
2215 big_buffer_size)) != NULL)
2217 if ((Ustrlen(filename) < len ||
2218 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2219 Ustrstr(filename, "/../") != NULL) &&
2220 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2222 fprintf(stderr, "-C Permission denied\n");
2227 if (real_uid != root_uid)
2229 #ifdef TRUSTED_CONFIG_LIST
2231 if (real_uid != exim_uid
2232 #ifdef CONFIGURE_OWNER
2233 && real_uid != config_uid
2236 trusted_config = FALSE;
2239 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2242 struct stat statbuf;
2244 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2245 (statbuf.st_uid != root_uid /* owner not root */
2246 #ifdef CONFIGURE_OWNER
2247 && statbuf.st_uid != config_uid /* owner not the special one */
2250 (statbuf.st_gid != root_gid /* group not root */
2251 #ifdef CONFIGURE_GROUP
2252 && statbuf.st_gid != config_gid /* group not the special one */
2254 && (statbuf.st_mode & 020) != 0 /* group writeable */
2256 (statbuf.st_mode & 2) != 0) /* world writeable */
2258 trusted_config = FALSE;
2263 /* Well, the trust list at least is up to scratch... */
2264 void *reset_point = store_get(0);
2265 uschar *trusted_configs[32];
2269 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2271 uschar *start = big_buffer, *nl;
2272 while (*start && isspace(*start))
2276 nl = Ustrchr(start, '\n');
2279 trusted_configs[nr_configs++] = string_copy(start);
2280 if (nr_configs == 32)
2288 uschar *list = argrest;
2290 while (trusted_config && (filename = string_nextinlist(&list,
2291 &sep, big_buffer, big_buffer_size)) != NULL)
2293 for (i=0; i < nr_configs; i++)
2295 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2298 if (i == nr_configs)
2300 trusted_config = FALSE;
2304 store_reset(reset_point);
2308 /* No valid prefixes found in trust_list file. */
2309 trusted_config = FALSE;
2315 /* Could not open trust_list file. */
2316 trusted_config = FALSE;
2320 /* Not root; don't trust config */
2321 trusted_config = FALSE;
2325 config_main_filelist = argrest;
2326 config_changed = TRUE;
2331 /* -D: set up a macro definition */
2334 #ifdef DISABLE_D_OPTION
2335 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2340 macro_item *mlast = NULL;
2343 uschar *s = argrest;
2345 while (isspace(*s)) s++;
2347 if (*s < 'A' || *s > 'Z')
2349 fprintf(stderr, "exim: macro name set by -D must start with "
2350 "an upper case letter\n");
2354 while (isalnum(*s) || *s == '_')
2356 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2360 if (ptr == 0) { badarg = TRUE; break; }
2361 while (isspace(*s)) s++;
2364 if (*s++ != '=') { badarg = TRUE; break; }
2365 while (isspace(*s)) s++;
2368 for (m = macros; m != NULL; m = m->next)
2370 if (Ustrcmp(m->name, name) == 0)
2372 fprintf(stderr, "exim: duplicated -D in command line\n");
2378 m = store_get(sizeof(macro_item) + Ustrlen(name));
2380 m->command_line = TRUE;
2381 if (mlast == NULL) macros = m; else mlast->next = m;
2382 Ustrcpy(m->name, name);
2383 m->replacement = string_copy(s);
2385 if (clmacro_count >= MAX_CLMACROS)
2387 fprintf(stderr, "exim: too many -D options on command line\n");
2390 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2396 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2397 The latter is now a no-op, retained for compatibility only. If -dd is used,
2398 debugging subprocesses of the daemon is disabled. */
2401 if (Ustrcmp(argrest, "ropcr") == 0)
2403 /* drop_cr = TRUE; */
2406 /* Use an intermediate variable so that we don't set debugging while
2407 decoding the debugging bits. */
2411 unsigned int selector = D_default;
2414 if (*argrest == 'd')
2416 debug_daemon = TRUE;
2420 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2421 debug_options_count, US"debug", 0);
2422 debug_selector = selector;
2427 /* -E: This is a local error message. This option is not intended for
2428 external use at all, but is not restricted to trusted callers because it
2429 does no harm (just suppresses certain error messages) and if Exim is run
2430 not setuid root it won't always be trusted when it generates error
2431 messages using this option. If there is a message id following -E, point
2432 message_reference at it, for logging. */
2435 local_error_message = TRUE;
2436 if (mac_ismsgid(argrest)) message_reference = argrest;
2440 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2441 option, so it looks as if historically the -oex options are also callable
2442 without the leading -o. So we have to accept them. Before the switch,
2443 anything starting -oe has been converted to -e. Exim does not support all
2444 of the sendmail error options. */
2447 if (Ustrcmp(argrest, "e") == 0)
2449 arg_error_handling = ERRORS_SENDER;
2450 errors_sender_rc = EXIT_SUCCESS;
2452 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2453 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2454 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2455 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2460 /* -F: Set sender's full name, used instead of the gecos entry from
2461 the password file. Since users can usually alter their gecos entries,
2462 there's no security involved in using this instead. The data can follow
2463 the -F or be in the next argument. */
2468 if(++i < argc) argrest = argv[i]; else
2469 { badarg = TRUE; break; }
2471 originator_name = argrest;
2472 sender_name_forced = TRUE;
2476 /* -f: Set sender's address - this value is only actually used if Exim is
2477 run by a trusted user, or if untrusted_set_sender is set and matches the
2478 address, except that the null address can always be set by any user. The
2479 test for this happens later, when the value given here is ignored when not
2480 permitted. For an untrusted user, the actual sender is still put in Sender:
2481 if it doesn't match the From: header (unless no_local_from_check is set).
2482 The data can follow the -f or be in the next argument. The -r switch is an
2483 obsolete form of -f but since there appear to be programs out there that
2484 use anything that sendmail has ever supported, better accept it - the
2485 synonymizing is done before the switch above.
2487 At this stage, we must allow domain literal addresses, because we don't
2488 know what the setting of allow_domain_literals is yet. Ditto for trailing
2489 dots and strip_trailing_dot. */
2497 if (i+1 < argc) argrest = argv[++i]; else
2498 { badarg = TRUE; break; }
2502 sender_address = string_sprintf(""); /* Ensure writeable memory */
2506 uschar *temp = argrest + Ustrlen(argrest) - 1;
2507 while (temp >= argrest && isspace(*temp)) temp--;
2508 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2509 allow_domain_literals = TRUE;
2510 strip_trailing_dot = TRUE;
2511 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2512 &sender_address_domain, TRUE);
2513 allow_domain_literals = FALSE;
2514 strip_trailing_dot = FALSE;
2515 if (sender_address == NULL)
2517 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2518 return EXIT_FAILURE;
2521 sender_address_forced = TRUE;
2525 /* -G: sendmail invocation to specify that it's a gateway submission and
2526 sendmail may complain about problems instead of fixing them.
2527 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2528 not at this time complain about problems. */
2534 /* -h: Set the hop count for an incoming message. Exim does not currently
2535 support this; it always computes it by counting the Received: headers.
2536 To put it in will require a change to the spool header file format. */
2541 if(++i < argc) argrest = argv[i]; else
2542 { badarg = TRUE; break; }
2544 if (!isdigit(*argrest)) badarg = TRUE;
2548 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2549 not to be documented for sendmail but mailx (at least) uses it) */
2552 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2556 /* -L: set the identifier used for syslog; equivalent to setting
2557 syslog_processname in the config file, but needs to be an admin option. */
2560 if (*argrest == '\0')
2562 if(++i < argc) argrest = argv[i]; else
2563 { badarg = TRUE; break; }
2565 sz = Ustrlen(argrest);
2568 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2569 return EXIT_FAILURE;
2573 fprintf(stderr, "exim: the -L syslog name is too short\n");
2574 return EXIT_FAILURE;
2576 cmdline_syslog_name = argrest;
2580 receiving_message = FALSE;
2582 /* -MC: continue delivery of another message via an existing open
2583 file descriptor. This option is used for an internal call by the
2584 smtp transport when there is a pending message waiting to go to an
2585 address to which it has got a connection. Five subsequent arguments are
2586 required: transport name, host name, IP address, sequence number, and
2587 message_id. Transports may decline to create new processes if the sequence
2588 number gets too big. The channel is stdin. This (-MC) must be the last
2589 argument. There's a subsequent check that the real-uid is privileged.
2591 If we are running in the test harness. delay for a bit, to let the process
2592 that set this one up complete. This makes for repeatability of the logging,
2595 if (Ustrcmp(argrest, "C") == 0)
2597 union sockaddr_46 interface_sock;
2598 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2602 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2603 return EXIT_FAILURE;
2606 if (msg_action_arg >= 0)
2608 fprintf(stderr, "exim: incompatible arguments\n");
2609 return EXIT_FAILURE;
2612 continue_transport = argv[++i];
2613 continue_hostname = argv[++i];
2614 continue_host_address = argv[++i];
2615 continue_sequence = Uatoi(argv[++i]);
2616 msg_action = MSG_DELIVER;
2617 msg_action_arg = ++i;
2618 forced_delivery = TRUE;
2619 queue_run_pid = passed_qr_pid;
2620 queue_run_pipe = passed_qr_pipe;
2622 if (!mac_ismsgid(argv[i]))
2624 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2626 return EXIT_FAILURE;
2629 /* Set up $sending_ip_address and $sending_port */
2631 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2633 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2637 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2639 return EXIT_FAILURE;
2642 if (running_in_test_harness) millisleep(500);
2646 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2647 precedes -MC (see above). The flag indicates that the host to which
2648 Exim is connected has accepted an AUTH sequence. */
2650 else if (Ustrcmp(argrest, "CA") == 0)
2652 smtp_authenticated = TRUE;
2656 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2657 it preceded -MC (see above) */
2659 else if (Ustrcmp(argrest, "CP") == 0)
2661 smtp_use_pipelining = TRUE;
2665 /* -MCQ: pass on the pid of the queue-running process that started
2666 this chain of deliveries and the fd of its synchronizing pipe; this
2667 is useful only when it precedes -MC (see above) */
2669 else if (Ustrcmp(argrest, "CQ") == 0)
2671 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2673 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2678 /* -MCS: set the smtp_use_size flag; this is useful only when it
2679 precedes -MC (see above) */
2681 else if (Ustrcmp(argrest, "CS") == 0)
2683 smtp_use_size = TRUE;
2687 /* -MCT: set the tls_offered flag; this is useful only when it
2688 precedes -MC (see above). The flag indicates that the host to which
2689 Exim is connected has offered TLS support. */
2692 else if (Ustrcmp(argrest, "CT") == 0)
2699 /* -M[x]: various operations on the following list of message ids:
2700 -M deliver the messages, ignoring next retry times and thawing
2701 -Mc deliver the messages, checking next retry times, no thawing
2702 -Mf freeze the messages
2703 -Mg give up on the messages
2704 -Mt thaw the messages
2705 -Mrm remove the messages
2706 In the above cases, this must be the last option. There are also the
2707 following options which are followed by a single message id, and which
2708 act on that message. Some of them use the "recipient" addresses as well.
2709 -Mar add recipient(s)
2710 -Mmad mark all recipients delivered
2711 -Mmd mark recipients(s) delivered
2713 -Mset load a message for use with -be
2715 -Mvc show copy (of whole message, in RFC 2822 format)
2720 else if (*argrest == 0)
2722 msg_action = MSG_DELIVER;
2723 forced_delivery = deliver_force_thaw = TRUE;
2725 else if (Ustrcmp(argrest, "ar") == 0)
2727 msg_action = MSG_ADD_RECIPIENT;
2728 one_msg_action = TRUE;
2730 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2731 else if (Ustrcmp(argrest, "es") == 0)
2733 msg_action = MSG_EDIT_SENDER;
2734 one_msg_action = TRUE;
2736 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2737 else if (Ustrcmp(argrest, "g") == 0)
2739 msg_action = MSG_DELIVER;
2740 deliver_give_up = TRUE;
2742 else if (Ustrcmp(argrest, "mad") == 0)
2744 msg_action = MSG_MARK_ALL_DELIVERED;
2746 else if (Ustrcmp(argrest, "md") == 0)
2748 msg_action = MSG_MARK_DELIVERED;
2749 one_msg_action = TRUE;
2751 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2752 else if (Ustrcmp(argrest, "set") == 0)
2754 msg_action = MSG_LOAD;
2755 one_msg_action = TRUE;
2757 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2758 else if (Ustrcmp(argrest, "vb") == 0)
2760 msg_action = MSG_SHOW_BODY;
2761 one_msg_action = TRUE;
2763 else if (Ustrcmp(argrest, "vc") == 0)
2765 msg_action = MSG_SHOW_COPY;
2766 one_msg_action = TRUE;
2768 else if (Ustrcmp(argrest, "vh") == 0)
2770 msg_action = MSG_SHOW_HEADER;
2771 one_msg_action = TRUE;
2773 else if (Ustrcmp(argrest, "vl") == 0)
2775 msg_action = MSG_SHOW_LOG;
2776 one_msg_action = TRUE;
2778 else { badarg = TRUE; break; }
2780 /* All the -Mxx options require at least one message id. */
2782 msg_action_arg = i + 1;
2783 if (msg_action_arg >= argc)
2785 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2786 return EXIT_FAILURE;
2789 /* Some require only message ids to follow */
2791 if (!one_msg_action)
2794 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2796 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2798 return EXIT_FAILURE;
2800 goto END_ARG; /* Remaining args are ids */
2803 /* Others require only one message id, possibly followed by addresses,
2804 which will be handled as normal arguments. */
2808 if (!mac_ismsgid(argv[msg_action_arg]))
2810 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2811 argv[msg_action_arg], arg);
2812 return EXIT_FAILURE;
2819 /* Some programs seem to call the -om option without the leading o;
2820 for sendmail it askes for "me too". Exim always does this. */
2823 if (*argrest != 0) badarg = TRUE;
2827 /* -N: don't do delivery - a debugging option that stops transports doing
2828 their thing. It implies debugging at the D_v level. */
2833 dont_deliver = TRUE;
2834 debug_selector |= D_v;
2835 debug_file = stderr;
2841 /* -n: This means "don't alias" in sendmail, apparently.
2842 For normal invocations, it has no effect.
2843 It may affect some other options. */
2849 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2850 option to the specified value. This form uses long names. We need to handle
2851 -O option=value and -Ooption=value. */
2858 fprintf(stderr, "exim: string expected after -O\n");
2866 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2869 if (*argrest == 'A')
2871 alias_arg = argrest + 1;
2872 if (alias_arg[0] == 0)
2874 if (i+1 < argc) alias_arg = argv[++i]; else
2876 fprintf(stderr, "exim: string expected after -oA\n");
2882 /* -oB: Set a connection message max value for remote deliveries */
2884 else if (*argrest == 'B')
2886 uschar *p = argrest + 1;
2889 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2891 connection_max_messages = 1;
2900 fprintf(stderr, "exim: number expected after -oB\n");
2903 connection_max_messages = Uatoi(p);
2907 /* -odb: background delivery */
2909 else if (Ustrcmp(argrest, "db") == 0)
2911 synchronous_delivery = FALSE;
2912 arg_queue_only = FALSE;
2913 queue_only_set = TRUE;
2916 /* -odf: foreground delivery (smail-compatible option); same effect as
2917 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2920 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2922 synchronous_delivery = TRUE;
2923 arg_queue_only = FALSE;
2924 queue_only_set = TRUE;
2927 /* -odq: queue only */
2929 else if (Ustrcmp(argrest, "dq") == 0)
2931 synchronous_delivery = FALSE;
2932 arg_queue_only = TRUE;
2933 queue_only_set = TRUE;
2936 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2937 but no remote delivery */
2939 else if (Ustrcmp(argrest, "dqs") == 0)
2942 arg_queue_only = FALSE;
2943 queue_only_set = TRUE;
2946 /* -oex: Sendmail error flags. As these are also accepted without the
2947 leading -o prefix, for compatibility with vacation and other callers,
2948 they are handled with -e above. */
2950 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2951 -oitrue: Another sendmail syntax for the same */
2953 else if (Ustrcmp(argrest, "i") == 0 ||
2954 Ustrcmp(argrest, "itrue") == 0)
2957 /* -oM*: Set various characteristics for an incoming message; actually
2958 acted on for trusted callers only. */
2960 else if (*argrest == 'M')
2964 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2968 /* -oMa: Set sender host address */
2970 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2972 /* -oMaa: Set authenticator name */
2974 else if (Ustrcmp(argrest, "Maa") == 0)
2975 sender_host_authenticated = argv[++i];
2977 /* -oMas: setting authenticated sender */
2979 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2981 /* -oMai: setting authenticated id */
2983 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2985 /* -oMi: Set incoming interface address */
2987 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2989 /* -oMr: Received protocol */
2991 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2993 /* -oMs: Set sender host name */
2995 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2997 /* -oMt: Set sender ident */
2999 else if (Ustrcmp(argrest, "Mt") == 0)
3001 sender_ident_set = TRUE;
3002 sender_ident = argv[++i];
3005 /* Else a bad argument */
3014 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3015 seem to call this as -m (undocumented), so that is also accepted (see
3018 else if (Ustrcmp(argrest, "m") == 0) {}
3020 /* -oo: An ancient flag for old-style addresses which still seems to
3021 crop up in some calls (see in SCO). */
3023 else if (Ustrcmp(argrest, "o") == 0) {}
3025 /* -oP <name>: set pid file path for daemon */
3027 else if (Ustrcmp(argrest, "P") == 0)
3028 override_pid_file_path = argv[++i];
3030 /* -or <n>: set timeout for non-SMTP acceptance
3031 -os <n>: set timeout for SMTP acceptance */
3033 else if (*argrest == 'r' || *argrest == 's')
3035 int *tp = (*argrest == 'r')?
3036 &arg_receive_timeout : &arg_smtp_receive_timeout;
3037 if (argrest[1] == 0)
3039 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3041 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3044 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3049 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3051 else if (Ustrcmp(argrest, "X") == 0)
3052 override_local_interfaces = argv[++i];
3054 /* Unknown -o argument */
3060 /* -ps: force Perl startup; -pd force delayed Perl startup */
3064 if (*argrest == 's' && argrest[1] == 0)
3066 perl_start_option = 1;
3069 if (*argrest == 'd' && argrest[1] == 0)
3071 perl_start_option = -1;
3076 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3077 which sets the host protocol and host name */
3081 if (i+1 < argc) argrest = argv[++i]; else
3082 { badarg = TRUE; break; }
3087 uschar *hn = Ustrchr(argrest, ':');
3090 received_protocol = argrest;
3094 received_protocol = string_copyn(argrest, hn - argrest);
3095 sender_host_name = hn + 1;
3102 receiving_message = FALSE;
3103 if (queue_interval >= 0)
3105 fprintf(stderr, "exim: -q specified more than once\n");
3109 /* -qq...: Do queue runs in a 2-stage manner */
3111 if (*argrest == 'q')
3113 queue_2stage = TRUE;
3117 /* -qi...: Do only first (initial) deliveries */
3119 if (*argrest == 'i')
3121 queue_run_first_delivery = TRUE;
3125 /* -qf...: Run the queue, forcing deliveries
3126 -qff..: Ditto, forcing thawing as well */
3128 if (*argrest == 'f')
3130 queue_run_force = TRUE;
3131 if (*(++argrest) == 'f')
3133 deliver_force_thaw = TRUE;
3138 /* -q[f][f]l...: Run the queue only on local deliveries */
3140 if (*argrest == 'l')
3142 queue_run_local = TRUE;
3146 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3147 optionally starting from a given message id. */
3149 if (*argrest == 0 &&
3150 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3153 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3154 start_queue_run_id = argv[++i];
3155 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3156 stop_queue_run_id = argv[++i];
3159 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3160 optionally local only. */
3165 queue_interval = readconf_readtime(argrest, 0, FALSE);
3167 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3168 if (queue_interval <= 0)
3170 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3177 case 'R': /* Synonymous with -qR... */
3178 receiving_message = FALSE;
3180 /* -Rf: As -R (below) but force all deliveries,
3181 -Rff: Ditto, but also thaw all frozen messages,
3182 -Rr: String is regex
3183 -Rrf: Regex and force
3184 -Rrff: Regex and force and thaw
3186 in all cases provided there are no further characters in this
3192 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3194 if (Ustrcmp(argrest, rsopts[i]) == 0)
3196 if (i != 2) queue_run_force = TRUE;
3197 if (i >= 2) deliver_selectstring_regex = TRUE;
3198 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3199 argrest += Ustrlen(rsopts[i]);
3204 /* -R: Set string to match in addresses for forced queue run to
3205 pick out particular messages. */
3209 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3211 fprintf(stderr, "exim: string expected after -R\n");
3215 else deliver_selectstring = argrest;
3219 /* -r: an obsolete synonym for -f (see above) */
3222 /* -S: Like -R but works on sender. */
3224 case 'S': /* Synonymous with -qS... */
3225 receiving_message = FALSE;
3227 /* -Sf: As -S (below) but force all deliveries,
3228 -Sff: Ditto, but also thaw all frozen messages,
3229 -Sr: String is regex
3230 -Srf: Regex and force
3231 -Srff: Regex and force and thaw
3233 in all cases provided there are no further characters in this
3239 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3241 if (Ustrcmp(argrest, rsopts[i]) == 0)
3243 if (i != 2) queue_run_force = TRUE;
3244 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3245 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3246 argrest += Ustrlen(rsopts[i]);
3251 /* -S: Set string to match in addresses for forced queue run to
3252 pick out particular messages. */
3256 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3258 fprintf(stderr, "exim: string expected after -S\n");
3262 else deliver_selectstring_sender = argrest;
3265 /* -Tqt is an option that is exclusively for use by the testing suite.
3266 It is not recognized in other circumstances. It allows for the setting up
3267 of explicit "queue times" so that various warning/retry things can be
3268 tested. Otherwise variability of clock ticks etc. cause problems. */
3271 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3272 fudged_queue_times = argv[++i];
3277 /* -t: Set flag to extract recipients from body of message. */
3280 if (*argrest == 0) extract_recipients = TRUE;
3282 /* -ti: Set flag to extract recipients from body of message, and also
3283 specify that dot does not end the message. */
3285 else if (Ustrcmp(argrest, "i") == 0)
3287 extract_recipients = TRUE;
3291 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3294 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3301 /* -U: This means "initial user submission" in sendmail, apparently. The
3302 doc claims that in future sendmail may refuse syntactically invalid
3303 messages instead of fixing them. For the moment, we just ignore it. */
3309 /* -v: verify things - this is a very low-level debugging */
3314 debug_selector |= D_v;
3315 debug_file = stderr;
3321 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3323 The -x flag tells the sendmail command that mail from a local
3324 mail program has National Language Support (NLS) extended characters
3325 in the body of the mail item. The sendmail command can send mail with
3326 extended NLS characters across networks that normally corrupts these
3329 As Exim is 8-bit clean, it just ignores this flag. */
3332 if (*argrest != 0) badarg = TRUE;
3335 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3336 logs to that file. We swallow the parameter and otherwise ignore it. */
3339 if (*argrest == '\0')
3343 fprintf(stderr, "exim: string expected after -X\n");
3349 /* All other initial characters are errors */
3354 } /* End of high-level switch statement */
3356 /* Failed to recognize the option, or syntax error */
3360 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3361 "option %s\n", arg);
3367 /* If -R or -S have been specified without -q, assume a single queue run. */
3369 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3370 queue_interval < 0) queue_interval = 0;
3374 /* If usage_wanted is set we call the usage function - which never returns */
3375 if (usage_wanted) exim_usage(called_as);
3377 /* Arguments have been processed. Check for incompatibilities. */
3379 (smtp_input || extract_recipients || recipients_arg < argc) &&
3380 (daemon_listen || queue_interval >= 0 || bi_option ||
3381 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3382 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3385 msg_action_arg > 0 &&
3386 (daemon_listen || queue_interval >= 0 || list_options ||
3387 (checking && msg_action != MSG_LOAD) ||
3388 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3391 (daemon_listen || queue_interval >= 0) &&
3392 (sender_address != NULL || list_options || list_queue || checking ||
3396 daemon_listen && queue_interval == 0
3399 inetd_wait_mode && queue_interval >= 0
3403 (checking || smtp_input || extract_recipients ||
3404 filter_test != FTEST_NONE || bi_option)
3407 verify_address_mode &&
3408 (address_test_mode || smtp_input || extract_recipients ||
3409 filter_test != FTEST_NONE || bi_option)
3412 address_test_mode && (smtp_input || extract_recipients ||
3413 filter_test != FTEST_NONE || bi_option)
3416 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3420 deliver_selectstring != NULL && queue_interval < 0
3423 msg_action == MSG_LOAD &&
3424 (!expansion_test || expansion_test_message != NULL)
3428 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3432 /* If debugging is set up, set the file and the file descriptor to pass on to
3433 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3434 to run in the foreground. */
3436 if (debug_selector != 0)
3438 debug_file = stderr;
3439 debug_fd = fileno(debug_file);
3440 background_daemon = FALSE;
3441 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3442 if (debug_selector != D_v) /* -v only doesn't show this */
3444 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3445 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3447 if (!version_printed)
3448 show_whats_supported(stderr);
3452 /* When started with root privilege, ensure that the limits on the number of
3453 open files and the number of processes (where that is accessible) are
3454 sufficiently large, or are unset, in case Exim has been called from an
3455 environment where the limits are screwed down. Not all OS have the ability to
3456 change some of these limits. */
3460 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3466 #ifdef RLIMIT_NOFILE
3467 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3469 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3471 rlp.rlim_cur = rlp.rlim_max = 0;
3474 /* I originally chose 1000 as a nice big number that was unlikely to
3475 be exceeded. It turns out that some older OS have a fixed upper limit of
3478 if (rlp.rlim_cur < 1000)
3480 rlp.rlim_cur = rlp.rlim_max = 1000;
3481 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3483 rlp.rlim_cur = rlp.rlim_max = 256;
3484 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3485 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3492 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3494 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3496 rlp.rlim_cur = rlp.rlim_max = 0;
3499 #ifdef RLIM_INFINITY
3500 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3502 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3504 if (rlp.rlim_cur < 1000)
3506 rlp.rlim_cur = rlp.rlim_max = 1000;
3508 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3509 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3515 /* Exim is normally entered as root (but some special configurations are
3516 possible that don't do this). However, it always spins off sub-processes that
3517 set their uid and gid as required for local delivery. We don't want to pass on
3518 any extra groups that root may belong to, so we want to get rid of them all at
3521 We need to obey setgroups() at this stage, before possibly giving up root
3522 privilege for a changed configuration file, but later on we might need to
3523 check on the additional groups for the admin user privilege - can't do that
3524 till after reading the config, which might specify the exim gid. Therefore,
3525 save the group list here first. */
3527 group_count = getgroups(NGROUPS_MAX, group_list);
3528 if (group_count < 0)
3530 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3534 /* There is a fundamental difference in some BSD systems in the matter of
3535 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3536 known not to be different. On the "different" systems there is a single group
3537 list, and the first entry in it is the current group. On all other versions of
3538 Unix there is a supplementary group list, which is in *addition* to the current
3539 group. Consequently, to get rid of all extraneous groups on a "standard" system
3540 you pass over 0 groups to setgroups(), while on a "different" system you pass
3541 over a single group - the current group, which is always the first group in the
3542 list. Calling setgroups() with zero groups on a "different" system results in
3543 an error return. The following code should cope with both types of system.
3545 However, if this process isn't running as root, setgroups() can't be used
3546 since you have to be root to run it, even if throwing away groups. Not being
3547 root here happens only in some unusual configurations. We just ignore the
3550 if (setgroups(0, NULL) != 0)
3552 if (setgroups(1, group_list) != 0 && !unprivileged)
3554 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3559 /* If the configuration file name has been altered by an argument on the
3560 command line (either a new file name or a macro definition) and the caller is
3561 not root, or if this is a filter testing run, remove any setuid privilege the
3562 program has and run as the underlying user.
3564 The exim user is locked out of this, which severely restricts the use of -C
3567 Otherwise, set the real ids to the effective values (should be root unless run
3568 from inetd, which it can either be root or the exim uid, if one is configured).
3570 There is a private mechanism for bypassing some of this, in order to make it
3571 possible to test lots of configurations automatically, without having either to
3572 recompile each time, or to patch in an actual configuration file name and other
3573 values (such as the path name). If running in the test harness, pretend that
3574 configuration file changes and macro definitions haven't happened. */
3577 (!trusted_config || /* Config changed, or */
3578 !macros_trusted()) && /* impermissible macros and */
3579 real_uid != root_uid && /* Not root, and */
3580 !running_in_test_harness /* Not fudged */
3582 expansion_test /* expansion testing */
3584 filter_test != FTEST_NONE) /* Filter testing */
3586 setgroups(group_count, group_list);
3587 exim_setugid(real_uid, real_gid, FALSE,
3588 US"-C, -D, -be or -bf forces real uid");
3589 removed_privilege = TRUE;
3591 /* In the normal case when Exim is called like this, stderr is available
3592 and should be used for any logging information because attempts to write
3593 to the log will usually fail. To arrange this, we unset really_exim. However,
3594 if no stderr is available there is no point - we might as well have a go
3595 at the log (if it fails, syslog will be written).
3597 Note that if the invoker is Exim, the logs remain available. Messing with
3598 this causes unlogged successful deliveries. */
3600 if ((log_stderr != NULL) && (real_uid != exim_uid))
3601 really_exim = FALSE;
3604 /* Privilege is to be retained for the moment. It may be dropped later,
3605 depending on the job that this Exim process has been asked to do. For now, set
3606 the real uid to the effective so that subsequent re-execs of Exim are done by a
3609 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3611 /* If testing a filter, open the file(s) now, before wasting time doing other
3612 setups and reading the message. */
3614 if ((filter_test & FTEST_SYSTEM) != 0)
3616 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3619 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3621 return EXIT_FAILURE;
3625 if ((filter_test & FTEST_USER) != 0)
3627 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3630 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3632 return EXIT_FAILURE;
3636 /* Initialise lookup_list
3637 If debugging, already called above via version reporting.
3638 In either case, we initialise the list of available lookups while running
3639 as root. All dynamically modules are loaded from a directory which is
3640 hard-coded into the binary and is code which, if not a module, would be
3641 part of Exim already. Ability to modify the content of the directory
3642 is equivalent to the ability to modify a setuid binary!
3644 This needs to happen before we read the main configuration. */
3647 /* Read the main runtime configuration data; this gives up if there
3648 is a failure. It leaves the configuration file open so that the subsequent
3649 configuration data for delivery can be read if needed. */
3651 /* To be safe: change the working directory to /. */
3652 if (Uchdir("/") < 0)
3654 perror("exim: chdir `/': ");
3658 /* Store the initial cwd before we change directories */
3659 if ((initial_cwd = getcwd(NULL, 0)) == NULL)
3661 perror("exim: can't get the current working directory");
3667 if (cleanup_environment() == FALSE)
3668 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3671 /* If an action on specific messages is requested, or if a daemon or queue
3672 runner is being started, we need to know if Exim was called by an admin user.
3673 This is the case if the real user is root or exim, or if the real group is
3674 exim, or if one of the supplementary groups is exim or a group listed in
3675 admin_groups. We don't fail all message actions immediately if not admin_user,
3676 since some actions can be performed by non-admin users. Instead, set admin_user
3677 for later interrogation. */
3679 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3684 for (i = 0; i < group_count; i++)
3686 if (group_list[i] == exim_gid) admin_user = TRUE;
3687 else if (admin_groups != NULL)
3689 for (j = 1; j <= (int)(admin_groups[0]); j++)
3690 if (admin_groups[j] == group_list[i])
3691 { admin_user = TRUE; break; }
3693 if (admin_user) break;
3697 /* Another group of privileged users are the trusted users. These are root,
3698 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3699 are permitted to specify sender_addresses with -f on the command line, and
3700 other message parameters as well. */
3702 if (real_uid == root_uid || real_uid == exim_uid)
3703 trusted_caller = TRUE;
3708 if (trusted_users != NULL)
3710 for (i = 1; i <= (int)(trusted_users[0]); i++)
3711 if (trusted_users[i] == real_uid)
3712 { trusted_caller = TRUE; break; }
3715 if (!trusted_caller && trusted_groups != NULL)
3717 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3719 if (trusted_groups[i] == real_gid)
3720 trusted_caller = TRUE;
3721 else for (j = 0; j < group_count; j++)
3723 if (trusted_groups[i] == group_list[j])
3724 { trusted_caller = TRUE; break; }
3726 if (trusted_caller) break;
3731 /* Handle the decoding of logging options. */
3733 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3734 log_selector_string, log_options, log_options_count, US"log", 0);
3738 debug_printf("configuration file is %s\n", config_main_filename);
3739 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3740 log_extra_selector);
3743 /* If domain literals are not allowed, check the sender address that was
3744 supplied with -f. Ditto for a stripped trailing dot. */
3746 if (sender_address != NULL)
3748 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3750 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3751 "allowed\n", sender_address);
3752 return EXIT_FAILURE;
3754 if (f_end_dot && !strip_trailing_dot)
3756 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3757 "(trailing dot not allowed)\n", sender_address);
3758 return EXIT_FAILURE;
3762 /* See if an admin user overrode our logging. */
3764 if (cmdline_syslog_name != NULL)
3768 syslog_processname = cmdline_syslog_name;
3769 log_file_path = string_copy(CUS"syslog");
3773 /* not a panic, non-privileged users should not be able to spam paniclog */
3775 "exim: you lack sufficient privilege to specify syslog process name\n");
3776 return EXIT_FAILURE;
3780 /* Paranoia check of maximum lengths of certain strings. There is a check
3781 on the length of the log file path in log.c, which will come into effect
3782 if there are any calls to write the log earlier than this. However, if we
3783 get this far but the string is very long, it is better to stop now than to
3784 carry on and (e.g.) receive a message and then have to collapse. The call to
3785 log_write() from here will cause the ultimate panic collapse if the complete
3786 file name exceeds the buffer length. */
3788 if (Ustrlen(log_file_path) > 200)
3789 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3790 "log_file_path is longer than 200 chars: aborting");
3792 if (Ustrlen(pid_file_path) > 200)
3793 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3794 "pid_file_path is longer than 200 chars: aborting");
3796 if (Ustrlen(spool_directory) > 200)
3797 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3798 "spool_directory is longer than 200 chars: aborting");
3800 /* Length check on the process name given to syslog for its TAG field,
3801 which is only permitted to be 32 characters or less. See RFC 3164. */
3803 if (Ustrlen(syslog_processname) > 32)
3804 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3805 "syslog_processname is longer than 32 chars: aborting");
3807 /* In some operating systems, the environment variable TMPDIR controls where
3808 temporary files are created; Exim doesn't use these (apart from when delivering
3809 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3810 If TMPDIR is found in the environment, reset it to the value defined in the
3811 TMPDIR macro, if this macro is defined. */
3816 if (environ) for (p = USS environ; *p != NULL; p++)
3818 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3819 Ustrcmp(*p+7, TMPDIR) != 0)
3821 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3822 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3824 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3830 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3831 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3832 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3833 called by a user who has set the TZ variable. This then affects the timestamps
3834 in log files and in Received: headers, and any created Date: header lines. The
3835 required timezone is settable in the configuration file, so nothing can be done
3836 about this earlier - but hopefully nothing will normally be logged earlier than
3837 this. We have to make a new environment if TZ is wrong, but don't bother if
3838 timestamps_utc is set, because then all times are in UTC anyway. */
3840 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3842 timestamps_utc = TRUE;
3846 uschar *envtz = US getenv("TZ");
3847 if ((envtz == NULL && timezone_string != NULL) ||
3849 (timezone_string == NULL ||
3850 Ustrcmp(timezone_string, envtz) != 0)))
3852 uschar **p = USS environ;
3856 if (environ) while (*p++ != NULL) count++;
3857 if (envtz == NULL) count++;
3858 newp = new = malloc(sizeof(uschar *) * (count + 1));
3859 if (environ) for (p = USS environ; *p != NULL; p++)
3861 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3864 if (timezone_string != NULL)
3866 *newp = malloc(Ustrlen(timezone_string) + 4);
3867 sprintf(CS *newp++, "TZ=%s", timezone_string);
3872 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3873 tod_stamp(tod_log));
3877 /* Handle the case when we have removed the setuid privilege because of -C or
3878 -D. This means that the caller of Exim was not root.
3880 There is a problem if we were running as the Exim user. The sysadmin may
3881 expect this case to retain privilege because "the binary was called by the
3882 Exim user", but it hasn't, because either the -D option set macros, or the
3883 -C option set a non-trusted configuration file. There are two possibilities:
3885 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3886 to do message deliveries. Thus, the fact that it is running as a
3887 non-privileged user is plausible, and might be wanted in some special
3888 configurations. However, really_exim will have been set false when
3889 privilege was dropped, to stop Exim trying to write to its normal log
3890 files. Therefore, re-enable normal log processing, assuming the sysadmin
3891 has set up the log directory correctly.
3893 (2) If deliver_drop_privilege is not set, the configuration won't work as
3894 apparently intended, and so we log a panic message. In order to retain
3895 root for -C or -D, the caller must either be root or be invoking a
3896 trusted configuration file (when deliver_drop_privilege is false). */
3898 if (removed_privilege && (!trusted_config || macros != NULL) &&
3899 real_uid == exim_uid)
3901 if (deliver_drop_privilege)
3902 really_exim = TRUE; /* let logging work normally */
3904 log_write(0, LOG_MAIN|LOG_PANIC,
3905 "exim user lost privilege for using %s option",
3906 trusted_config? "-D" : "-C");
3909 /* Start up Perl interpreter if Perl support is configured and there is a
3910 perl_startup option, and the configuration or the command line specifies
3911 initializing starting. Note that the global variables are actually called
3912 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3915 if (perl_start_option != 0)
3916 opt_perl_at_start = (perl_start_option > 0);
3917 if (opt_perl_at_start && opt_perl_startup != NULL)
3920 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3921 errstr = init_perl(opt_perl_startup);
3924 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3925 return EXIT_FAILURE;
3927 opt_perl_started = TRUE;
3929 #endif /* EXIM_PERL */
3931 /* Log the arguments of the call if the configuration file said so. This is
3932 a debugging feature for finding out what arguments certain MUAs actually use.
3933 Don't attempt it if logging is disabled, or if listing variables or if
3934 verifying/testing addresses or expansions. */
3936 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3937 && really_exim && !list_options && !checking)
3940 uschar *p = big_buffer;
3941 Ustrcpy(p, "cwd= (failed)");
3943 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3946 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3948 for (i = 0; i < argc; i++)
3950 int len = Ustrlen(argv[i]);
3953 if (p + len + 8 >= big_buffer + big_buffer_size)
3956 log_write(0, LOG_MAIN, "%s", big_buffer);
3957 Ustrcpy(big_buffer, "...");
3960 printing = string_printing(argv[i]);
3961 if (printing[0] == 0) quote = US"\""; else
3963 uschar *pp = printing;
3965 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3967 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3968 (p - big_buffer) - 4), printing, quote);
3972 if ((log_extra_selector & LX_arguments) != 0)
3973 log_write(0, LOG_MAIN, "%s", big_buffer);
3975 debug_printf("%s\n", big_buffer);
3978 /* Set the working directory to be the top-level spool directory. We don't rely
3979 on this in the code, which always uses fully qualified names, but it's useful
3980 for core dumps etc. Don't complain if it fails - the spool directory might not
3981 be generally accessible and calls with the -C option (and others) have lost
3982 privilege by now. Before the chdir, we try to ensure that the directory exists.
3985 if (Uchdir(spool_directory) != 0)
3988 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3989 dummy = /* quieten compiler */ Uchdir(spool_directory);
3992 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3993 alias file. Exim doesn't have such a concept, but this call is screwed into
3994 Sun's YP makefiles. Handle this by calling a configured script, as the real
3995 user who called Exim. The -oA option can be used to pass an argument to the
4000 (void)fclose(config_file);
4001 if (bi_command != NULL)
4005 argv[i++] = bi_command;
4006 if (alias_arg != NULL) argv[i++] = alias_arg;
4009 setgroups(group_count, group_list);
4010 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4012 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4013 (argv[1] == NULL)? US"" : argv[1]);
4015 execv(CS argv[0], (char *const *)argv);
4016 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4021 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4026 /* We moved the admin/trusted check to be immediately after reading the
4027 configuration file. We leave these prints here to ensure that syslog setup,
4028 logfile setup, and so on has already happened. */
4030 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4031 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4033 /* Only an admin user may start the daemon or force a queue run in the default
4034 configuration, but the queue run restriction can be relaxed. Only an admin
4035 user may request that a message be returned to its sender forthwith. Only an
4036 admin user may specify a debug level greater than D_v (because it might show
4037 passwords, etc. in lookup queries). Only an admin user may request a queue
4038 count. Only an admin user can use the test interface to scan for email
4039 (because Exim will be in the spool dir and able to look at mails). */
4043 BOOL debugset = (debug_selector & ~D_v) != 0;
4044 if (deliver_give_up || daemon_listen || malware_test_file ||
4045 (count_queue && queue_list_requires_admin) ||
4046 (list_queue && queue_list_requires_admin) ||
4047 (queue_interval >= 0 && prod_requires_admin) ||
4048 (debugset && !running_in_test_harness))
4050 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4055 /* If the real user is not root or the exim uid, the argument for passing
4056 in an open TCP/IP connection for another message is not permitted, nor is
4057 running with the -N option for any delivery action, unless this call to exim is
4058 one that supplied an input message, or we are using a patched exim for
4059 regression testing. */
4061 if (real_uid != root_uid && real_uid != exim_uid &&
4062 (continue_hostname != NULL ||
4064 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4065 )) && !running_in_test_harness)
4067 fprintf(stderr, "exim: Permission denied\n");
4068 return EXIT_FAILURE;
4071 /* If the caller is not trusted, certain arguments are ignored when running for
4072 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4073 Note that authority for performing certain actions on messages is tested in the
4074 queue_action() function. */
4076 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4078 sender_host_name = sender_host_address = interface_address =
4079 sender_ident = received_protocol = NULL;
4080 sender_host_port = interface_port = 0;
4081 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4084 /* If a sender host address is set, extract the optional port number off the
4085 end of it and check its syntax. Do the same thing for the interface address.
4086 Exim exits if the syntax is bad. */
4090 if (sender_host_address != NULL)
4091 sender_host_port = check_port(sender_host_address);
4092 if (interface_address != NULL)
4093 interface_port = check_port(interface_address);
4096 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4101 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4102 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4106 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4107 return EXIT_FAILURE;
4111 /* If an SMTP message is being received check to see if the standard input is a
4112 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4113 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4118 union sockaddr_46 inetd_sock;
4119 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4120 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4122 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4123 if (family == AF_INET || family == AF_INET6)
4125 union sockaddr_46 interface_sock;
4126 size = sizeof(interface_sock);
4128 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4129 interface_address = host_ntoa(-1, &interface_sock, NULL,
4132 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4134 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4137 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4138 NULL, &sender_host_port);
4139 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4140 "inetd is not supported when mua_wrapper is set");
4145 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4146 return EXIT_FAILURE;
4152 /* If the load average is going to be needed while receiving a message, get it
4153 now for those OS that require the first call to os_getloadavg() to be done as
4154 root. There will be further calls later for each message received. */
4156 #ifdef LOAD_AVG_NEEDS_ROOT
4157 if (receiving_message &&
4158 (queue_only_load >= 0 ||
4159 (is_inetd && smtp_load_reserve >= 0)
4162 load_average = OS_GETLOADAVG();
4166 /* The queue_only configuration option can be overridden by -odx on the command
4167 line, except that if queue_only_override is false, queue_only cannot be unset
4168 from the command line. */
4170 if (queue_only_set && (queue_only_override || arg_queue_only))
4171 queue_only = arg_queue_only;
4173 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4176 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4177 if (arg_smtp_receive_timeout >= 0)
4178 smtp_receive_timeout = arg_smtp_receive_timeout;
4180 /* If Exim was started with root privilege, unless we have already removed the
4181 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4182 except when starting the daemon or doing some kind of delivery or address
4183 testing (-bt). These are the only cases when root need to be retained. We run
4184 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4185 retained only for starting the daemon. We always do the initgroups() in this
4186 situation (controlled by the TRUE below), in order to be as close as possible
4187 to the state Exim usually runs in. */
4189 if (!unprivileged && /* originally had root AND */
4190 !removed_privilege && /* still got root AND */
4191 !daemon_listen && /* not starting the daemon */
4192 queue_interval <= 0 && /* (either kind of daemon) */
4194 deliver_drop_privilege || /* requested unprivileged */
4196 queue_interval < 0 && /* not running the queue */
4197 (msg_action_arg < 0 || /* and */
4198 msg_action != MSG_DELIVER) && /* not delivering and */
4199 (!checking || !address_test_mode) /* not address checking */
4203 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4206 /* When we are retaining a privileged uid, we still change to the exim gid. */
4211 rv = setgid(exim_gid);
4212 /* Impact of failure is that some stuff might end up with an incorrect group.
4213 We track this for failures from root, since any attempt to change privilege
4214 by root should succeed and failures should be examined. For non-root,
4215 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4216 no need to complain then. */
4219 if (!(unprivileged || removed_privilege))
4222 "exim: changing group failed: %s\n", strerror(errno));
4226 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4227 (long int)exim_gid, strerror(errno));
4231 /* Handle a request to scan a file for malware */
4232 if (malware_test_file)
4234 #ifdef WITH_CONTENT_SCAN
4236 set_process_info("scanning file for malware");
4237 result = malware_in_file(malware_test_file);
4240 printf("No malware found.\n");
4245 printf("Malware lookup returned non-okay/fail: %d\n", result);
4249 printf("Malware found: %s\n", malware_name);
4251 printf("Malware scan detected malware of unknown name.\n");
4253 printf("Malware scanning not enabled at compile time.\n");
4258 /* Handle a request to list the delivery queue */
4262 set_process_info("listing the queue");
4263 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4267 /* Handle a request to count the delivery queue */
4271 set_process_info("counting the queue");
4276 /* Handle actions on specific messages, except for the force delivery and
4277 message load actions, which are done below. Some actions take a whole list of
4278 message ids, which are known to continue up to the end of the arguments. Others
4279 take a single message id and then operate on the recipients list. */
4281 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4283 int yield = EXIT_SUCCESS;
4284 set_process_info("acting on specified messages");
4286 if (!one_msg_action)
4288 for (i = msg_action_arg; i < argc; i++)
4289 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4290 yield = EXIT_FAILURE;
4293 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4294 recipients_arg)) yield = EXIT_FAILURE;
4298 /* We used to set up here to skip reading the ACL section, on
4299 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4300 Now, since the intro of the ${acl } expansion, ACL definitions may be
4301 needed in transports so we lost the optimisation. */
4305 /* The configuration data will have been read into POOL_PERM because we won't
4306 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4307 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4308 configuration were read into POOL_MAIN, because we don't do any resets till
4309 later on. However, it seems right, and it does ensure that both pools get used.
4312 store_pool = POOL_MAIN;
4314 /* Handle the -brt option. This is for checking out retry configurations.
4315 The next three arguments are a domain name or a complete address, and
4316 optionally two error numbers. All it does is to call the function that
4317 scans the retry configuration data. */
4319 if (test_retry_arg >= 0)
4321 retry_config *yield;
4322 int basic_errno = 0;
4326 if (test_retry_arg >= argc)
4328 printf("-brt needs a domain or address argument\n");
4329 exim_exit(EXIT_FAILURE);
4331 s1 = argv[test_retry_arg++];
4334 /* If the first argument contains no @ and no . it might be a local user
4335 or it might be a single-component name. Treat as a domain. */
4337 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4339 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4340 "being \ntreated as a one-component domain, not as a local part.\n\n",
4344 /* There may be an optional second domain arg. */
4346 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4347 s2 = argv[test_retry_arg++];
4349 /* The final arg is an error name */
4351 if (test_retry_arg < argc)
4353 uschar *ss = argv[test_retry_arg];
4355 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4358 printf("%s\n", CS error);
4359 return EXIT_FAILURE;
4362 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4363 code > 100 as an error is for matching codes to the decade. Turn them into
4364 a real error code, off the decade. */
4366 if (basic_errno == ERRNO_MAIL4XX ||
4367 basic_errno == ERRNO_RCPT4XX ||
4368 basic_errno == ERRNO_DATA4XX)
4370 int code = (more_errno >> 8) & 255;
4372 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4373 else if (code > 100)
4374 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4378 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4379 if (yield == NULL) printf("No retry information found\n"); else
4382 more_errno = yield->more_errno;
4383 printf("Retry rule: %s ", yield->pattern);
4385 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4387 printf("quota%s%s ",
4388 (more_errno > 0)? "_" : "",
4389 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4391 else if (yield->basic_errno == ECONNREFUSED)
4393 printf("refused%s%s ",
4394 (more_errno > 0)? "_" : "",
4395 (more_errno == 'M')? "MX" :
4396 (more_errno == 'A')? "A" : "");
4398 else if (yield->basic_errno == ETIMEDOUT)
4401 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4403 if (more_errno != 0) printf("_%s",
4404 (more_errno == 'M')? "MX" : "A");
4407 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4408 printf("auth_failed ");
4411 for (r = yield->rules; r != NULL; r = r->next)
4413 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4414 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4420 printf(",%d.", x/1000);
4434 exim_exit(EXIT_SUCCESS);
4437 /* Handle a request to list one or more configuration options */
4438 /* If -n was set, we suppress some information */
4442 set_process_info("listing variables");
4443 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4444 else for (i = recipients_arg; i < argc; i++)
4447 (Ustrcmp(argv[i], "router") == 0 ||
4448 Ustrcmp(argv[i], "transport") == 0 ||
4449 Ustrcmp(argv[i], "authenticator") == 0 ||
4450 Ustrcmp(argv[i], "macro") == 0 ||
4451 Ustrcmp(argv[i], "environment") == 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 */