1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 extern void init_lookup_list(void);
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Enums for cmdline interface *
57 *************************************************/
59 enum commandline_info { CMDINFO_NONE=0,
60 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
65 /*************************************************
66 * Compile regular expression and panic on fail *
67 *************************************************/
69 /* This function is called when failure to compile a regular expression leads
70 to a panic exit. In other cases, pcre_compile() is called directly. In many
71 cases where this function is used, the results of the compilation are to be
72 placed in long-lived store, so we temporarily reset the store management
73 functions that PCRE uses if the use_malloc flag is set.
76 pattern the pattern to compile
77 caseless TRUE if caseless matching is required
78 use_malloc TRUE if compile into malloc store
80 Returns: pointer to the compiled pattern
84 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
87 int options = PCRE_COPT;
92 pcre_malloc = function_store_malloc;
93 pcre_free = function_store_free;
95 if (caseless) options |= PCRE_CASELESS;
96 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
97 pcre_malloc = function_store_get;
98 pcre_free = function_dummy_free;
100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
101 "%s at offset %d while compiling %s", error, offset, pattern);
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings.
116 re the compiled expression
117 subject the subject string
118 options additional PCRE options
119 setup if < 0 do full setup
120 if >= 0 setup from setup+1 onwards,
121 excluding the full matched string
123 Returns: TRUE or FALSE
127 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
129 int ovector[3*(EXPAND_MAXN+1)];
130 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
131 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
133 if (n == 0) n = EXPAND_MAXN + 1;
137 expand_nmax = (setup < 0)? 0 : setup + 1;
138 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
140 expand_nstring[expand_nmax] = subject + ovector[nn];
141 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
151 /*************************************************
152 * Set up processing details *
153 *************************************************/
155 /* Save a text string for dumping when SIGUSR1 is received.
156 Do checks for overruns.
158 Arguments: format and arguments, as for printf()
163 set_process_info(const char *format, ...)
167 sprintf(CS process_info, "%5d ", (int)getpid());
168 len = Ustrlen(process_info);
169 va_start(ap, format);
170 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
171 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
172 len = Ustrlen(process_info);
173 process_info[len+0] = '\n';
174 process_info[len+1] = '\0';
175 process_info_len = len + 1;
176 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
183 /*************************************************
184 * Handler for SIGUSR1 *
185 *************************************************/
187 /* SIGUSR1 causes any exim process to write to the process log details of
188 what it is currently doing. It will only be used if the OS is capable of
189 setting up a handler that causes automatic restarting of any system call
190 that is in progress at the time.
192 This function takes care to be signal-safe.
194 Argument: the signal number (SIGUSR1)
199 usr1_handler(int sig)
203 os_restarting_signal(sig, usr1_handler);
205 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
208 /* If we are already running as the Exim user, try to create it in the
209 current process (assuming spool_directory exists). Otherwise, if we are
210 root, do the creation in an exim:exim subprocess. */
212 int euid = geteuid();
213 if (euid == exim_uid)
214 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
215 else if (euid == root_uid)
216 fd = log_create_as_exim(process_log_path);
219 /* If we are neither exim nor root, or if we failed to create the log file,
220 give up. There is not much useful we can do with errors, since we don't want
221 to disrupt whatever is going on outside the signal handler. */
225 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
231 /*************************************************
233 *************************************************/
235 /* This handler is enabled most of the time that Exim is running. The handler
236 doesn't actually get used unless alarm() has been called to set a timer, to
237 place a time limit on a system call of some kind. When the handler is run, it
240 There are some other SIGALRM handlers that are used in special cases when more
241 than just a flag setting is required; for example, when reading a message's
242 input. These are normally set up in the code module that uses them, and the
243 SIGALRM handler is reset to this one afterwards.
245 Argument: the signal value (SIGALRM)
250 sigalrm_handler(int sig)
252 sig = sig; /* Keep picky compilers happy */
254 os_non_restarting_signal(SIGALRM, sigalrm_handler);
259 /*************************************************
260 * Sleep for a fractional time interval *
261 *************************************************/
263 /* This function is called by millisleep() and exim_wait_tick() to wait for a
264 period of time that may include a fraction of a second. The coding is somewhat
265 tedious. We do not expect setitimer() ever to fail, but if it does, the process
266 will wait for ever, so we panic in this instance. (There was a case of this
267 when a bug in a function that calls milliwait() caused it to pass invalid data.
268 That's when I added the check. :-)
270 Argument: an itimerval structure containing the interval
275 milliwait(struct itimerval *itval)
278 sigset_t old_sigmask;
279 (void)sigemptyset(&sigmask); /* Empty mask */
280 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
281 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
282 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
283 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
284 "setitimer() failed: %s", strerror(errno));
285 (void)sigfillset(&sigmask); /* All signals */
286 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
287 (void)sigsuspend(&sigmask); /* Until SIGALRM */
288 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
294 /*************************************************
295 * Millisecond sleep function *
296 *************************************************/
298 /* The basic sleep() function has a granularity of 1 second, which is too rough
299 in some cases - for example, when using an increasing delay to slow down
302 Argument: number of millseconds
309 struct itimerval itval;
310 itval.it_interval.tv_sec = 0;
311 itval.it_interval.tv_usec = 0;
312 itval.it_value.tv_sec = msec/1000;
313 itval.it_value.tv_usec = (msec % 1000) * 1000;
319 /*************************************************
320 * Compare microsecond times *
321 *************************************************/
328 Returns: -1, 0, or +1
332 exim_tvcmp(struct timeval *t1, struct timeval *t2)
334 if (t1->tv_sec > t2->tv_sec) return +1;
335 if (t1->tv_sec < t2->tv_sec) return -1;
336 if (t1->tv_usec > t2->tv_usec) return +1;
337 if (t1->tv_usec < t2->tv_usec) return -1;
344 /*************************************************
345 * Clock tick wait function *
346 *************************************************/
348 /* Exim uses a time + a pid to generate a unique identifier in two places: its
349 message IDs, and in file names for maildir deliveries. Because some OS now
350 re-use pids within the same second, sub-second times are now being used.
351 However, for absolute certaintly, we must ensure the clock has ticked before
352 allowing the relevant process to complete. At the time of implementation of
353 this code (February 2003), the speed of processors is such that the clock will
354 invariably have ticked already by the time a process has done its job. This
355 function prepares for the time when things are faster - and it also copes with
356 clocks that go backwards.
359 then_tv A timeval which was used to create uniqueness; its usec field
360 has been rounded down to the value of the resolution.
361 We want to be sure the current time is greater than this.
362 resolution The resolution that was used to divide the microseconds
363 (1 for maildir, larger for message ids)
369 exim_wait_tick(struct timeval *then_tv, int resolution)
371 struct timeval now_tv;
372 long int now_true_usec;
374 (void)gettimeofday(&now_tv, NULL);
375 now_true_usec = now_tv.tv_usec;
376 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
378 if (exim_tvcmp(&now_tv, then_tv) <= 0)
380 struct itimerval itval;
381 itval.it_interval.tv_sec = 0;
382 itval.it_interval.tv_usec = 0;
383 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
384 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
386 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
387 negative value for the microseconds is possible only in the case when "now"
388 is more than a second less than "then". That means that itval.it_value.tv_sec
389 is greater than zero. The following correction is therefore safe. */
391 if (itval.it_value.tv_usec < 0)
393 itval.it_value.tv_usec += 1000000;
394 itval.it_value.tv_sec -= 1;
397 DEBUG(D_transport|D_receive)
399 if (!running_in_test_harness)
401 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
402 then_tv->tv_sec, (long) then_tv->tv_usec,
403 now_tv.tv_sec, (long) now_tv.tv_usec);
404 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
405 (long) itval.it_value.tv_usec);
416 /*************************************************
417 * Call fopen() with umask 777 and adjust mode *
418 *************************************************/
420 /* Exim runs with umask(0) so that files created with open() have the mode that
421 is specified in the open() call. However, there are some files, typically in
422 the spool directory, that are created with fopen(). They end up world-writeable
423 if no precautions are taken. Although the spool directory is not accessible to
424 the world, this is an untidiness. So this is a wrapper function for fopen()
425 that sorts out the mode of the created file.
428 filename the file name
429 options the fopen() options
430 mode the required mode
432 Returns: the fopened FILE or NULL
436 modefopen(const uschar *filename, const char *options, mode_t mode)
438 mode_t saved_umask = umask(0777);
439 FILE *f = Ufopen(filename, options);
440 (void)umask(saved_umask);
441 if (f != NULL) (void)fchmod(fileno(f), mode);
448 /*************************************************
449 * Ensure stdin, stdout, and stderr exist *
450 *************************************************/
452 /* Some operating systems grumble if an exec() happens without a standard
453 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
454 file will be opened and will use these fd values, and then some other bit of
455 code will assume, for example, that it can write error messages to stderr.
456 This function ensures that fds 0, 1, and 2 are open if they do not already
457 exist, by connecting them to /dev/null.
459 This function is also used to ensure that std{in,out,err} exist at all times,
460 so that if any library that Exim calls tries to use them, it doesn't crash.
472 for (i = 0; i <= 2; i++)
474 if (fstat(i, &statbuf) < 0 && errno == EBADF)
476 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
477 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
478 string_open_failed(errno, "/dev/null"));
479 if (devnull != i) (void)dup2(devnull, i);
482 if (devnull > 2) (void)close(devnull);
488 /*************************************************
489 * Close unwanted file descriptors for delivery *
490 *************************************************/
492 /* This function is called from a new process that has been forked to deliver
493 an incoming message, either directly, or using exec.
495 We want any smtp input streams to be closed in this new process. However, it
496 has been observed that using fclose() here causes trouble. When reading in -bS
497 input, duplicate copies of messages have been seen. The files will be sharing a
498 file pointer with the parent process, and it seems that fclose() (at least on
499 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
500 least sometimes. Hence we go for closing the underlying file descriptors.
502 If TLS is active, we want to shut down the TLS library, but without molesting
503 the parent's SSL connection.
505 For delivery of a non-SMTP message, we want to close stdin and stdout (and
506 stderr unless debugging) because the calling process might have set them up as
507 pipes and be waiting for them to close before it waits for the submission
508 process to terminate. If they aren't closed, they hold up the calling process
509 until the initial delivery process finishes, which is not what we want.
511 Exception: We do want it for synchronous delivery!
513 And notwithstanding all the above, if D_resolver is set, implying resolver
514 debugging, leave stdout open, because that's where the resolver writes its
517 When we close stderr (which implies we've also closed stdout), we also get rid
518 of any controlling terminal.
530 tls_close(TRUE, FALSE); /* Shut down the TLS library */
532 (void)close(fileno(smtp_in));
533 (void)close(fileno(smtp_out));
538 (void)close(0); /* stdin */
539 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
540 if (debug_selector == 0) /* stderr */
542 if (!synchronous_delivery)
555 /*************************************************
557 *************************************************/
559 /* This function sets a new uid and gid permanently, optionally calling
560 initgroups() to set auxiliary groups. There are some special cases when running
561 Exim in unprivileged modes. In these situations the effective uid will not be
562 root; if we already have the right effective uid/gid, and don't need to
563 initialize any groups, leave things as they are.
568 igflag TRUE if initgroups() wanted
569 msg text to use in debugging output and failure log
571 Returns: nothing; bombs out on failure
575 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
577 uid_t euid = geteuid();
578 gid_t egid = getegid();
580 if (euid == root_uid || euid != uid || egid != gid || igflag)
582 /* At least one OS returns +1 for initgroups failure, so just check for
587 struct passwd *pw = getpwuid(uid);
590 if (initgroups(pw->pw_name, gid) != 0)
591 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
592 (long int)uid, strerror(errno));
594 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
595 "no passwd entry for uid=%ld", (long int)uid);
598 if (setgid(gid) < 0 || setuid(uid) < 0)
600 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
601 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
605 /* Debugging output included uid/gid and all groups */
609 int group_count, save_errno;
610 gid_t group_list[NGROUPS_MAX];
611 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
612 (long int)geteuid(), (long int)getegid(), (long int)getpid());
613 group_count = getgroups(NGROUPS_MAX, group_list);
615 debug_printf(" auxiliary group list:");
619 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
621 else if (group_count < 0)
622 debug_printf(" <error: %s>", strerror(save_errno));
623 else debug_printf(" <none>");
631 /*************************************************
633 *************************************************/
635 /* Exim exits via this function so that it always clears up any open
641 Returns: does not return
649 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
650 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
657 /*************************************************
658 * Extract port from host address *
659 *************************************************/
661 /* Called to extract the port from the values given to -oMa and -oMi.
662 It also checks the syntax of the address, and terminates it before the
663 port data when a port is extracted.
666 address the address, with possible port on the end
668 Returns: the port, or zero if there isn't one
669 bombs out on a syntax error
673 check_port(uschar *address)
675 int port = host_address_extract_port(address);
676 if (string_is_ip_address(address, NULL) == 0)
678 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
686 /*************************************************
687 * Test/verify an address *
688 *************************************************/
690 /* This function is called by the -bv and -bt code. It extracts a working
691 address from a full RFC 822 address. This isn't really necessary per se, but it
692 has the effect of collapsing source routes.
696 flags flag bits for verify_address()
697 exit_value to be set for failures
703 test_address(uschar *s, int flags, int *exit_value)
705 int start, end, domain;
706 uschar *parse_error = NULL;
707 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
711 fprintf(stdout, "syntax error: %s\n", parse_error);
716 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
717 -1, -1, NULL, NULL, NULL);
718 if (rc == FAIL) *exit_value = 2;
719 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
725 /*************************************************
726 * Show supported features *
727 *************************************************/
729 /* This function is called for -bV/--version and for -d to output the optional
730 features of the current Exim binary.
732 Arguments: a FILE for printing
737 show_whats_supported(FILE *f)
741 #ifdef DB_VERSION_STRING
742 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
743 #elif defined(BTREEVERSION) && defined(HASHVERSION)
745 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
747 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
749 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
750 fprintf(f, "Probably ndbm\n");
751 #elif defined(USE_TDB)
752 fprintf(f, "Using tdb\n");
755 fprintf(f, "Probably GDBM (native mode)\n");
757 fprintf(f, "Probably GDBM (compatibility mode)\n");
761 fprintf(f, "Support for:");
762 #ifdef SUPPORT_CRYPTEQ
763 fprintf(f, " crypteq");
766 fprintf(f, " iconv()");
771 #ifdef HAVE_SETCLASSRESOURCES
772 fprintf(f, " use_setclassresources");
781 fprintf(f, " Expand_dlfunc");
783 #ifdef USE_TCP_WRAPPERS
784 fprintf(f, " TCPwrappers");
788 fprintf(f, " GnuTLS");
790 fprintf(f, " OpenSSL");
793 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
794 fprintf(f, " translate_ip_address");
796 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
797 fprintf(f, " move_frozen_messages");
799 #ifdef WITH_CONTENT_SCAN
800 fprintf(f, " Content_Scanning");
805 #ifdef WITH_OLD_DEMIME
806 fprintf(f, " Old_Demime");
814 #ifdef EXPERIMENTAL_SPF
815 fprintf(f, " Experimental_SPF");
817 #ifdef EXPERIMENTAL_SRS
818 fprintf(f, " Experimental_SRS");
820 #ifdef EXPERIMENTAL_BRIGHTMAIL
821 fprintf(f, " Experimental_Brightmail");
823 #ifdef EXPERIMENTAL_DANE
824 fprintf(f, " Experimental_DANE");
826 #ifdef EXPERIMENTAL_DCC
827 fprintf(f, " Experimental_DCC");
829 #ifdef EXPERIMENTAL_DMARC
830 fprintf(f, " Experimental_DMARC");
832 #ifdef EXPERIMENTAL_PROXY
833 fprintf(f, " Experimental_Proxy");
835 #ifdef EXPERIMENTAL_TPDA
836 fprintf(f, " Experimental_TPDA");
838 #ifdef EXPERIMENTAL_REDIS
839 fprintf(f, " Experimental_Redis");
841 #ifdef EXPERIMENTAL_CERTNAMES
842 fprintf(f, " Experimental_Certnames");
844 #ifdef EXPERIMENTAL_DSN
845 fprintf(f, " Experimental_DSN");
849 fprintf(f, "Lookups (built-in):");
850 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
851 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
853 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
856 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
857 fprintf(f, " dbm dbmjz dbmnz");
859 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
860 fprintf(f, " dnsdb");
862 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
863 fprintf(f, " dsearch");
865 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
866 fprintf(f, " ibase");
868 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
869 fprintf(f, " ldap ldapdn ldapm");
871 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
872 fprintf(f, " mysql");
874 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
875 fprintf(f, " nis nis0");
877 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
878 fprintf(f, " nisplus");
880 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
881 fprintf(f, " oracle");
883 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
884 fprintf(f, " passwd");
886 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
887 fprintf(f, " pgsql");
889 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
890 fprintf(f, " sqlite");
892 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
893 fprintf(f, " testdb");
895 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
896 fprintf(f, " whoson");
900 fprintf(f, "Authenticators:");
902 fprintf(f, " cram_md5");
904 #ifdef AUTH_CYRUS_SASL
905 fprintf(f, " cyrus_sasl");
908 fprintf(f, " dovecot");
911 fprintf(f, " gsasl");
913 #ifdef AUTH_HEIMDAL_GSSAPI
914 fprintf(f, " heimdal_gssapi");
916 #ifdef AUTH_PLAINTEXT
917 fprintf(f, " plaintext");
924 fprintf(f, "Routers:");
926 fprintf(f, " accept");
928 #ifdef ROUTER_DNSLOOKUP
929 fprintf(f, " dnslookup");
931 #ifdef ROUTER_IPLITERAL
932 fprintf(f, " ipliteral");
934 #ifdef ROUTER_IPLOOKUP
935 fprintf(f, " iplookup");
937 #ifdef ROUTER_MANUALROUTE
938 fprintf(f, " manualroute");
940 #ifdef ROUTER_QUERYPROGRAM
941 fprintf(f, " queryprogram");
943 #ifdef ROUTER_REDIRECT
944 fprintf(f, " redirect");
948 fprintf(f, "Transports:");
949 #ifdef TRANSPORT_APPENDFILE
950 fprintf(f, " appendfile");
951 #ifdef SUPPORT_MAILDIR
952 fprintf(f, "/maildir");
954 #ifdef SUPPORT_MAILSTORE
955 fprintf(f, "/mailstore");
961 #ifdef TRANSPORT_AUTOREPLY
962 fprintf(f, " autoreply");
964 #ifdef TRANSPORT_LMTP
967 #ifdef TRANSPORT_PIPE
970 #ifdef TRANSPORT_SMTP
975 if (fixed_never_users[0] > 0)
978 fprintf(f, "Fixed never_users: ");
979 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
980 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
981 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
984 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
986 /* Everything else is details which are only worth reporting when debugging.
987 Perhaps the tls_version_report should move into this too. */
992 /* clang defines __GNUC__ (at least, for me) so test for it first */
993 #if defined(__clang__)
994 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
995 #elif defined(__GNUC__)
996 fprintf(f, "Compiler: GCC [%s]\n",
1000 "? unknown version ?"
1004 fprintf(f, "Compiler: <unknown>\n");
1008 tls_version_report(f);
1011 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1012 if (authi->version_report) {
1013 (*authi->version_report)(f);
1017 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1018 characters; unless it's an ancient version of PCRE in which case it
1020 #ifndef PCRE_PRERELEASE
1021 #define PCRE_PRERELEASE
1024 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1025 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1027 PCRE_MAJOR, PCRE_MINOR,
1028 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1031 #undef EXPAND_AND_QUOTE
1034 for (i = 0; i < lookup_list_count; i++)
1036 if (lookup_list[i]->version_report)
1037 lookup_list[i]->version_report(f);
1040 #ifdef WHITELIST_D_MACROS
1041 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1043 fprintf(f, "WHITELIST_D_MACROS unset\n");
1045 #ifdef TRUSTED_CONFIG_LIST
1046 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1048 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1055 /*************************************************
1056 * Show auxiliary information about Exim *
1057 *************************************************/
1060 show_exim_information(enum commandline_info request, FILE *stream)
1067 fprintf(stream, "Oops, something went wrong.\n");
1071 "The -bI: flag takes a string indicating which information to provide.\n"
1072 "If the string is not recognised, you'll get this help (on stderr).\n"
1074 " exim -bI:help this information\n"
1075 " exim -bI:dscp dscp value keywords known\n"
1076 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1080 for (pp = exim_sieve_extension_list; *pp; ++pp)
1081 fprintf(stream, "%s\n", *pp);
1084 dscp_list_to_stream(stream);
1090 /*************************************************
1091 * Quote a local part *
1092 *************************************************/
1094 /* This function is used when a sender address or a From: or Sender: header
1095 line is being created from the caller's login, or from an authenticated_id. It
1096 applies appropriate quoting rules for a local part.
1098 Argument: the local part
1099 Returns: the local part, quoted if necessary
1103 local_part_quote(uschar *lpart)
1105 BOOL needs_quote = FALSE;
1110 for (t = lpart; !needs_quote && *t != 0; t++)
1112 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1113 (*t != '.' || t == lpart || t[1] == 0);
1116 if (!needs_quote) return lpart;
1119 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1123 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1126 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1129 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1130 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1131 yield = string_cat(yield, &size, &ptr, nq, 1);
1135 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1143 /*************************************************
1144 * Load readline() functions *
1145 *************************************************/
1147 /* This function is called from testing executions that read data from stdin,
1148 but only when running as the calling user. Currently, only -be does this. The
1149 function loads the readline() function library and passes back the functions.
1150 On some systems, it needs the curses library, so load that too, but try without
1151 it if loading fails. All this functionality has to be requested at build time.
1154 fn_readline_ptr pointer to where to put the readline pointer
1155 fn_addhist_ptr pointer to where to put the addhistory function
1157 Returns: the dlopen handle or NULL on failure
1161 set_readline(char * (**fn_readline_ptr)(const char *),
1162 void (**fn_addhist_ptr)(const char *))
1165 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1167 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1168 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1170 if (dlhandle != NULL)
1172 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1173 * char * readline (const char *prompt);
1174 * void add_history (const char *string);
1176 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1177 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1181 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1190 /*************************************************
1191 * Get a line from stdin for testing things *
1192 *************************************************/
1194 /* This function is called when running tests that can take a number of lines
1195 of input (for example, -be and -bt). It handles continuations and trailing
1196 spaces. And prompting and a blank line output on eof. If readline() is in use,
1197 the arguments are non-NULL and provide the relevant functions.
1200 fn_readline readline function or NULL
1201 fn_addhist addhist function or NULL
1203 Returns: pointer to dynamic memory, or NULL at end of file
1207 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1212 uschar *yield = NULL;
1214 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1218 uschar buffer[1024];
1222 char *readline_line = NULL;
1223 if (fn_readline != NULL)
1225 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1226 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1227 p = US readline_line;
1232 /* readline() not in use */
1235 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1239 /* Handle the line */
1241 ss = p + (int)Ustrlen(p);
1242 while (ss > p && isspace(ss[-1])) ss--;
1246 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1249 yield = string_cat(yield, &size, &ptr, p, ss - p);
1252 if (fn_readline != NULL) free(readline_line);
1255 if (ss == p || yield[ptr-1] != '\\')
1263 if (yield == NULL) printf("\n");
1269 /*************************************************
1270 * Output usage information for the program *
1271 *************************************************/
1273 /* This function is called when there are no recipients
1274 or a specific --help argument was added.
1277 progname information on what name we were called by
1279 Returns: DOES NOT RETURN
1283 exim_usage(uschar *progname)
1286 /* Handle specific program invocation varients */
1287 if (Ustrcmp(progname, US"-mailq") == 0)
1290 "mailq - list the contents of the mail queue\n\n"
1291 "For a list of options, see the Exim documentation.\n");
1295 /* Generic usage - we output this whatever happens */
1297 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1298 "not directly from a shell command line. Options and/or arguments control\n"
1299 "what it does when called. For a list of options, see the Exim documentation.\n");
1306 /*************************************************
1307 * Validate that the macros given are okay *
1308 *************************************************/
1310 /* Typically, Exim will drop privileges if macros are supplied. In some
1311 cases, we want to not do so.
1313 Arguments: none (macros is a global)
1314 Returns: true if trusted, false otherwise
1318 macros_trusted(void)
1320 #ifdef WHITELIST_D_MACROS
1322 uschar *whitelisted, *end, *p, **whites, **w;
1323 int white_count, i, n;
1325 BOOL prev_char_item, found;
1330 #ifndef WHITELIST_D_MACROS
1334 /* We only trust -D overrides for some invoking users:
1335 root, the exim run-time user, the optional config owner user.
1336 I don't know why config-owner would be needed, but since they can own the
1337 config files anyway, there's no security risk to letting them override -D. */
1338 if ( ! ((real_uid == root_uid)
1339 || (real_uid == exim_uid)
1340 #ifdef CONFIGURE_OWNER
1341 || (real_uid == config_uid)
1345 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1349 /* Get a list of macros which are whitelisted */
1350 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1351 prev_char_item = FALSE;
1353 for (p = whitelisted; *p != '\0'; ++p)
1355 if (*p == ':' || isspace(*p))
1360 prev_char_item = FALSE;
1363 if (!prev_char_item)
1364 prev_char_item = TRUE;
1371 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1372 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1377 if (i == white_count)
1379 while (*p != '\0' && p < end)
1385 /* The list of macros should be very short. Accept the N*M complexity. */
1386 for (m = macros; m != NULL; m = m->next)
1389 for (w = whites; *w; ++w)
1390 if (Ustrcmp(*w, m->name) == 0)
1397 if (m->replacement == NULL)
1399 len = Ustrlen(m->replacement);
1402 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1403 0, PCRE_EOPT, NULL, 0);
1406 if (n != PCRE_ERROR_NOMATCH)
1407 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1411 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1417 /*************************************************
1418 * Entry point and high-level code *
1419 *************************************************/
1421 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1422 the appropriate action. All the necessary functions are present in the one
1423 binary. I originally thought one should split it up, but it turns out that so
1424 much of the apparatus is needed in each chunk that one might as well just have
1425 it all available all the time, which then makes the coding easier as well.
1428 argc count of entries in argv
1429 argv argument strings, with argv[0] being the program name
1431 Returns: EXIT_SUCCESS if terminated successfully
1432 EXIT_FAILURE otherwise, except when a message has been sent
1433 to the sender, and -oee was given
1437 main(int argc, char **cargv)
1439 uschar **argv = USS cargv;
1440 int arg_receive_timeout = -1;
1441 int arg_smtp_receive_timeout = -1;
1442 int arg_error_handling = error_handling;
1443 int filter_sfd = -1;
1444 int filter_ufd = -1;
1447 int list_queue_option = 0;
1449 int msg_action_arg = -1;
1450 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1451 int queue_only_reason = 0;
1453 int perl_start_option = 0;
1455 int recipients_arg = argc;
1456 int sender_address_domain = 0;
1457 int test_retry_arg = -1;
1458 int test_rewrite_arg = -1;
1459 BOOL arg_queue_only = FALSE;
1460 BOOL bi_option = FALSE;
1461 BOOL checking = FALSE;
1462 BOOL count_queue = FALSE;
1463 BOOL expansion_test = FALSE;
1464 BOOL extract_recipients = FALSE;
1465 BOOL flag_G = FALSE;
1466 BOOL flag_n = FALSE;
1467 BOOL forced_delivery = FALSE;
1468 BOOL f_end_dot = FALSE;
1469 BOOL deliver_give_up = FALSE;
1470 BOOL list_queue = FALSE;
1471 BOOL list_options = FALSE;
1472 BOOL local_queue_only;
1474 BOOL one_msg_action = FALSE;
1475 BOOL queue_only_set = FALSE;
1476 BOOL receiving_message = TRUE;
1477 BOOL sender_ident_set = FALSE;
1478 BOOL session_local_queue_only;
1480 BOOL removed_privilege = FALSE;
1481 BOOL usage_wanted = FALSE;
1482 BOOL verify_address_mode = FALSE;
1483 BOOL verify_as_sender = FALSE;
1484 BOOL version_printed = FALSE;
1485 uschar *alias_arg = NULL;
1486 uschar *called_as = US"";
1487 uschar *cmdline_syslog_name = NULL;
1488 uschar *start_queue_run_id = NULL;
1489 uschar *stop_queue_run_id = NULL;
1490 uschar *expansion_test_message = NULL;
1491 uschar *ftest_domain = NULL;
1492 uschar *ftest_localpart = NULL;
1493 uschar *ftest_prefix = NULL;
1494 uschar *ftest_suffix = NULL;
1495 uschar *malware_test_file = NULL;
1496 uschar *real_sender_address;
1497 uschar *originator_home = US"/";
1502 struct stat statbuf;
1503 pid_t passed_qr_pid = (pid_t)0;
1504 int passed_qr_pipe = -1;
1505 gid_t group_list[NGROUPS_MAX];
1507 /* For the -bI: flag */
1508 enum commandline_info info_flag = CMDINFO_NONE;
1509 BOOL info_stdout = FALSE;
1511 /* Possible options for -R and -S */
1513 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1515 /* Need to define this in case we need to change the environment in order
1516 to get rid of a bogus time zone. We have to make it char rather than uschar
1517 because some OS define it in /usr/include/unistd.h. */
1519 extern char **environ;
1521 /* If the Exim user and/or group and/or the configuration file owner/group were
1522 defined by ref:name at build time, we must now find the actual uid/gid values.
1523 This is a feature to make the lives of binary distributors easier. */
1525 #ifdef EXIM_USERNAME
1526 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1530 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1534 /* If ref:name uses a number as the name, route_finduser() returns
1535 TRUE with exim_uid set and pw coerced to NULL. */
1537 exim_gid = pw->pw_gid;
1538 #ifndef EXIM_GROUPNAME
1542 "exim: ref:name should specify a usercode, not a group.\n"
1543 "exim: can't let you get away with it unless you also specify a group.\n");
1550 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1556 #ifdef EXIM_GROUPNAME
1557 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1559 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1565 #ifdef CONFIGURE_OWNERNAME
1566 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1568 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1569 CONFIGURE_OWNERNAME);
1574 /* We default the system_filter_user to be the Exim run-time user, as a
1575 sane non-root value. */
1576 system_filter_uid = exim_uid;
1578 #ifdef CONFIGURE_GROUPNAME
1579 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1581 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1582 CONFIGURE_GROUPNAME);
1587 /* In the Cygwin environment, some initialization needs doing. It is fudged
1588 in by means of this macro. */
1594 /* Check a field which is patched when we are running Exim within its
1595 testing harness; do a fast initial check, and then the whole thing. */
1597 running_in_test_harness =
1598 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1600 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1601 at the start of a program; however, it seems that some environments do not
1602 follow this. A "strange" locale can affect the formatting of timestamps, so we
1605 setlocale(LC_ALL, "C");
1607 /* Set up the default handler for timing using alarm(). */
1609 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1611 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1612 because store_malloc writes a log entry on failure. */
1614 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1615 if (log_buffer == NULL)
1617 fprintf(stderr, "exim: failed to get store for log buffer\n");
1621 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1622 NULL when the daemon is run and the file is closed. We have to use this
1623 indirection, because some systems don't allow writing to the variable "stderr".
1626 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1628 /* Arrange for the PCRE regex library to use our store functions. Note that
1629 the normal calls are actually macros that add additional arguments for
1630 debugging purposes so we have to assign specially constructed functions here.
1631 The default is to use store in the stacking pool, but this is overridden in the
1632 regex_must_compile() function. */
1634 pcre_malloc = function_store_get;
1635 pcre_free = function_dummy_free;
1637 /* Ensure there is a big buffer for temporary use in several places. It is put
1638 in malloc store so that it can be freed for enlargement if necessary. */
1640 big_buffer = store_malloc(big_buffer_size);
1642 /* Set up the handler for the data request signal, and set the initial
1643 descriptive text. */
1645 set_process_info("initializing");
1646 os_restarting_signal(SIGUSR1, usr1_handler);
1648 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1649 in the daemon code. For the rest of Exim's uses, we ignore it. */
1651 signal(SIGHUP, SIG_IGN);
1653 /* We don't want to die on pipe errors as the code is written to handle
1654 the write error instead. */
1656 signal(SIGPIPE, SIG_IGN);
1658 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1659 set to SIG_IGN. This causes subprocesses that complete before the parent
1660 process waits for them not to hang around, so when Exim calls wait(), nothing
1661 is there. The wait() code has been made robust against this, but let's ensure
1662 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1663 ending status. We use sigaction rather than plain signal() on those OS where
1664 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1665 problem on AIX with this.) */
1669 struct sigaction act;
1670 act.sa_handler = SIG_DFL;
1671 sigemptyset(&(act.sa_mask));
1673 sigaction(SIGCHLD, &act, NULL);
1676 signal(SIGCHLD, SIG_DFL);
1679 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1684 /* Set up the version number. Set up the leading 'E' for the external form of
1685 message ids, set the pointer to the internal form, and initialize it to
1686 indicate no message being processed. */
1689 message_id_option[0] = '-';
1690 message_id_external = message_id_option + 1;
1691 message_id_external[0] = 'E';
1692 message_id = message_id_external + 1;
1695 /* Set the umask to zero so that any files Exim creates using open() are
1696 created with the modes that it specifies. NOTE: Files created with fopen() have
1697 a problem, which was not recognized till rather late (February 2006). With this
1698 umask, such files will be world writeable. (They are all content scanning files
1699 in the spool directory, which isn't world-accessible, so this is not a
1700 disaster, but it's untidy.) I don't want to change this overall setting,
1701 however, because it will interact badly with the open() calls. Instead, there's
1702 now a function called modefopen() that fiddles with the umask while calling
1707 /* Precompile the regular expression for matching a message id. Keep this in
1708 step with the code that generates ids in the accept.c module. We need to do
1709 this here, because the -M options check their arguments for syntactic validity
1710 using mac_ismsgid, which uses this. */
1713 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1715 /* Precompile the regular expression that is used for matching an SMTP error
1716 code, possibly extended, at the start of an error message. Note that the
1717 terminating whitespace character is included. */
1720 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1723 #ifdef WHITELIST_D_MACROS
1724 /* Precompile the regular expression used to filter the content of macros
1725 given to -D for permissibility. */
1727 regex_whitelisted_macro =
1728 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1732 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1733 this seems to be a generally accepted convention, since one finds symbolic
1734 links called "mailq" in standard OS configurations. */
1736 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1737 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1740 receiving_message = FALSE;
1741 called_as = US"-mailq";
1744 /* If the program is called as "rmail" treat it as equivalent to
1745 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1746 i.e. preventing a single dot on a line from terminating the message, and
1747 returning with zero return code, even in cases of error (provided an error
1748 message has been sent). */
1750 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1751 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1754 called_as = US"-rmail";
1755 errors_sender_rc = EXIT_SUCCESS;
1758 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1759 this is a smail convention. */
1761 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1762 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1764 smtp_input = smtp_batched_input = TRUE;
1765 called_as = US"-rsmtp";
1768 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1769 this is a smail convention. */
1771 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1772 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1775 receiving_message = FALSE;
1776 called_as = US"-runq";
1779 /* If the program is called as "newaliases" treat it as equivalent to
1780 "exim -bi"; this is a sendmail convention. */
1782 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1783 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1786 receiving_message = FALSE;
1787 called_as = US"-newaliases";
1790 /* Save the original effective uid for a couple of uses later. It should
1791 normally be root, but in some esoteric environments it may not be. */
1793 original_euid = geteuid();
1795 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1796 to be the same as the real ones. This makes a difference only if Exim is setuid
1797 (or setgid) to something other than root, which could be the case in some
1798 special configurations. */
1800 real_uid = getuid();
1801 real_gid = getgid();
1803 if (real_uid == root_uid)
1805 rv = setgid(real_gid);
1808 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1809 (long int)real_gid, strerror(errno));
1812 rv = setuid(real_uid);
1815 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1816 (long int)real_uid, strerror(errno));
1821 /* If neither the original real uid nor the original euid was root, Exim is
1822 running in an unprivileged state. */
1824 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1826 /* Scan the program's arguments. Some can be dealt with right away; others are
1827 simply recorded for checking and handling afterwards. Do a high-level switch
1828 on the second character (the one after '-'), to save some effort. */
1830 for (i = 1; i < argc; i++)
1832 BOOL badarg = FALSE;
1833 uschar *arg = argv[i];
1837 /* An argument not starting with '-' is the start of a recipients list;
1838 break out of the options-scanning loop. */
1846 /* An option consistion of -- terminates the options */
1848 if (Ustrcmp(arg, "--") == 0)
1850 recipients_arg = i + 1;
1854 /* Handle flagged options */
1856 switchchar = arg[1];
1859 /* Make all -ex options synonymous with -oex arguments, since that
1860 is assumed by various callers. Also make -qR options synonymous with -R
1861 options, as that seems to be required as well. Allow for -qqR too, and
1862 the same for -S options. */
1864 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1865 Ustrncmp(arg+1, "qR", 2) == 0 ||
1866 Ustrncmp(arg+1, "qS", 2) == 0)
1868 switchchar = arg[2];
1871 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1873 switchchar = arg[3];
1875 queue_2stage = TRUE;
1878 /* Make -r synonymous with -f, since it is a documented alias */
1880 else if (arg[1] == 'r') switchchar = 'f';
1882 /* Make -ov synonymous with -v */
1884 else if (Ustrcmp(arg, "-ov") == 0)
1890 /* deal with --option_aliases */
1891 else if (switchchar == '-')
1893 if (Ustrcmp(argrest, "help") == 0)
1895 usage_wanted = TRUE;
1898 else if (Ustrcmp(argrest, "version") == 0)
1905 /* High-level switch on active initial letter */
1910 /* sendmail uses -Ac and -Am to control which .cf file is used;
1913 if (*argrest == '\0') { badarg = TRUE; break; }
1916 BOOL ignore = FALSE;
1921 if (*(argrest + 1) == '\0')
1925 if (!ignore) { badarg = TRUE; break; }
1929 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1930 so has no need of it. */
1933 if (*argrest == 0) i++; /* Skip over the type */
1938 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1940 /* -bd: Run in daemon mode, awaiting SMTP connections.
1941 -bdf: Ditto, but in the foreground.
1944 if (*argrest == 'd')
1946 daemon_listen = TRUE;
1947 if (*(++argrest) == 'f') background_daemon = FALSE;
1948 else if (*argrest != 0) { badarg = TRUE; break; }
1951 /* -be: Run in expansion test mode
1952 -bem: Ditto, but read a message from a file first
1955 else if (*argrest == 'e')
1957 expansion_test = checking = TRUE;
1958 if (argrest[1] == 'm')
1960 if (++i >= argc) { badarg = TRUE; break; }
1961 expansion_test_message = argv[i];
1964 if (argrest[1] != 0) { badarg = TRUE; break; }
1967 /* -bF: Run system filter test */
1969 else if (*argrest == 'F')
1971 filter_test |= FTEST_SYSTEM;
1972 if (*(++argrest) != 0) { badarg = TRUE; break; }
1973 if (++i < argc) filter_test_sfile = argv[i]; else
1975 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1980 /* -bf: Run user filter test
1981 -bfd: Set domain for filter testing
1982 -bfl: Set local part for filter testing
1983 -bfp: Set prefix for filter testing
1984 -bfs: Set suffix for filter testing
1987 else if (*argrest == 'f')
1989 if (*(++argrest) == 0)
1991 filter_test |= FTEST_USER;
1992 if (++i < argc) filter_test_ufile = argv[i]; else
1994 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2002 fprintf(stderr, "exim: string expected after %s\n", arg);
2005 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2006 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2007 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2008 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2009 else { badarg = TRUE; break; }
2013 /* -bh: Host checking - an IP address must follow. */
2015 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2017 if (++i >= argc) { badarg = TRUE; break; }
2018 sender_host_address = argv[i];
2019 host_checking = checking = log_testing_mode = TRUE;
2020 host_checking_callout = argrest[1] == 'c';
2023 /* -bi: This option is used by sendmail to initialize *the* alias file,
2024 though it has the -oA option to specify a different file. Exim has no
2025 concept of *the* alias file, but since Sun's YP make script calls
2026 sendmail this way, some support must be provided. */
2028 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2030 /* -bI: provide information, of the type to follow after a colon.
2031 This is an Exim flag. */
2033 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2035 uschar *p = &argrest[2];
2036 info_flag = CMDINFO_HELP;
2039 if (strcmpic(p, CUS"sieve") == 0)
2041 info_flag = CMDINFO_SIEVE;
2044 else if (strcmpic(p, CUS"dscp") == 0)
2046 info_flag = CMDINFO_DSCP;
2049 else if (strcmpic(p, CUS"help") == 0)
2056 /* -bm: Accept and deliver message - the default option. Reinstate
2057 receiving_message, which got turned off for all -b options. */
2059 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2061 /* -bmalware: test the filename given for malware */
2063 else if (Ustrcmp(argrest, "malware") == 0)
2065 if (++i >= argc) { badarg = TRUE; break; }
2066 malware_test_file = argv[i];
2069 /* -bnq: For locally originating messages, do not qualify unqualified
2070 addresses. In the envelope, this causes errors; in header lines they
2073 else if (Ustrcmp(argrest, "nq") == 0)
2075 allow_unqualified_sender = FALSE;
2076 allow_unqualified_recipient = FALSE;
2079 /* -bpxx: List the contents of the mail queue, in various forms. If
2080 the option is -bpc, just a queue count is needed. Otherwise, if the
2081 first letter after p is r, then order is random. */
2083 else if (*argrest == 'p')
2085 if (*(++argrest) == 'c')
2088 if (*(++argrest) != 0) badarg = TRUE;
2092 if (*argrest == 'r')
2094 list_queue_option = 8;
2097 else list_queue_option = 0;
2101 /* -bp: List the contents of the mail queue, top-level only */
2103 if (*argrest == 0) {}
2105 /* -bpu: List the contents of the mail queue, top-level undelivered */
2107 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2109 /* -bpa: List the contents of the mail queue, including all delivered */
2111 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2113 /* Unknown after -bp[r] */
2123 /* -bP: List the configuration variables given as the address list.
2124 Force -v, so configuration errors get displayed. */
2126 else if (Ustrcmp(argrest, "P") == 0)
2128 list_options = TRUE;
2129 debug_selector |= D_v;
2130 debug_file = stderr;
2133 /* -brt: Test retry configuration lookup */
2135 else if (Ustrcmp(argrest, "rt") == 0)
2137 test_retry_arg = i + 1;
2141 /* -brw: Test rewrite configuration */
2143 else if (Ustrcmp(argrest, "rw") == 0)
2145 test_rewrite_arg = i + 1;
2149 /* -bS: Read SMTP commands on standard input, but produce no replies -
2150 all errors are reported by sending messages. */
2152 else if (Ustrcmp(argrest, "S") == 0)
2153 smtp_input = smtp_batched_input = receiving_message = TRUE;
2155 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2156 on standard output. */
2158 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2160 /* -bt: address testing mode */
2162 else if (Ustrcmp(argrest, "t") == 0)
2163 address_test_mode = checking = log_testing_mode = TRUE;
2165 /* -bv: verify addresses */
2167 else if (Ustrcmp(argrest, "v") == 0)
2168 verify_address_mode = checking = log_testing_mode = TRUE;
2170 /* -bvs: verify sender addresses */
2172 else if (Ustrcmp(argrest, "vs") == 0)
2174 verify_address_mode = checking = log_testing_mode = TRUE;
2175 verify_as_sender = TRUE;
2178 /* -bV: Print version string and support details */
2180 else if (Ustrcmp(argrest, "V") == 0)
2182 printf("Exim version %s #%s built %s\n", version_string,
2183 version_cnumber, version_date);
2184 printf("%s\n", CS version_copyright);
2185 version_printed = TRUE;
2186 show_whats_supported(stdout);
2189 /* -bw: inetd wait mode, accept a listening socket as stdin */
2191 else if (*argrest == 'w')
2193 inetd_wait_mode = TRUE;
2194 background_daemon = FALSE;
2195 daemon_listen = TRUE;
2196 if (*(++argrest) != '\0')
2198 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2199 if (inetd_wait_timeout <= 0)
2201 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2211 /* -C: change configuration file list; ignore if it isn't really
2212 a change! Enforce a prefix check if required. */
2217 if(++i < argc) argrest = argv[i]; else
2218 { badarg = TRUE; break; }
2220 if (Ustrcmp(config_main_filelist, argrest) != 0)
2222 #ifdef ALT_CONFIG_PREFIX
2224 int len = Ustrlen(ALT_CONFIG_PREFIX);
2225 uschar *list = argrest;
2227 while((filename = string_nextinlist(&list, &sep, big_buffer,
2228 big_buffer_size)) != NULL)
2230 if ((Ustrlen(filename) < len ||
2231 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2232 Ustrstr(filename, "/../") != NULL) &&
2233 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2235 fprintf(stderr, "-C Permission denied\n");
2240 if (real_uid != root_uid)
2242 #ifdef TRUSTED_CONFIG_LIST
2244 if (real_uid != exim_uid
2245 #ifdef CONFIGURE_OWNER
2246 && real_uid != config_uid
2249 trusted_config = FALSE;
2252 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2255 struct stat statbuf;
2257 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2258 (statbuf.st_uid != root_uid /* owner not root */
2259 #ifdef CONFIGURE_OWNER
2260 && statbuf.st_uid != config_uid /* owner not the special one */
2263 (statbuf.st_gid != root_gid /* group not root */
2264 #ifdef CONFIGURE_GROUP
2265 && statbuf.st_gid != config_gid /* group not the special one */
2267 && (statbuf.st_mode & 020) != 0 /* group writeable */
2269 (statbuf.st_mode & 2) != 0) /* world writeable */
2271 trusted_config = FALSE;
2276 /* Well, the trust list at least is up to scratch... */
2277 void *reset_point = store_get(0);
2278 uschar *trusted_configs[32];
2282 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2284 uschar *start = big_buffer, *nl;
2285 while (*start && isspace(*start))
2289 nl = Ustrchr(start, '\n');
2292 trusted_configs[nr_configs++] = string_copy(start);
2293 if (nr_configs == 32)
2301 uschar *list = argrest;
2303 while (trusted_config && (filename = string_nextinlist(&list,
2304 &sep, big_buffer, big_buffer_size)) != NULL)
2306 for (i=0; i < nr_configs; i++)
2308 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2311 if (i == nr_configs)
2313 trusted_config = FALSE;
2317 store_reset(reset_point);
2321 /* No valid prefixes found in trust_list file. */
2322 trusted_config = FALSE;
2328 /* Could not open trust_list file. */
2329 trusted_config = FALSE;
2333 /* Not root; don't trust config */
2334 trusted_config = FALSE;
2338 config_main_filelist = argrest;
2339 config_changed = TRUE;
2344 /* -D: set up a macro definition */
2347 #ifdef DISABLE_D_OPTION
2348 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2353 macro_item *mlast = NULL;
2356 uschar *s = argrest;
2358 while (isspace(*s)) s++;
2360 if (*s < 'A' || *s > 'Z')
2362 fprintf(stderr, "exim: macro name set by -D must start with "
2363 "an upper case letter\n");
2367 while (isalnum(*s) || *s == '_')
2369 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2373 if (ptr == 0) { badarg = TRUE; break; }
2374 while (isspace(*s)) s++;
2377 if (*s++ != '=') { badarg = TRUE; break; }
2378 while (isspace(*s)) s++;
2381 for (m = macros; m != NULL; m = m->next)
2383 if (Ustrcmp(m->name, name) == 0)
2385 fprintf(stderr, "exim: duplicated -D in command line\n");
2391 m = store_get(sizeof(macro_item) + Ustrlen(name));
2393 m->command_line = TRUE;
2394 if (mlast == NULL) macros = m; else mlast->next = m;
2395 Ustrcpy(m->name, name);
2396 m->replacement = string_copy(s);
2398 if (clmacro_count >= MAX_CLMACROS)
2400 fprintf(stderr, "exim: too many -D options on command line\n");
2403 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2409 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2410 The latter is now a no-op, retained for compatibility only. If -dd is used,
2411 debugging subprocesses of the daemon is disabled. */
2414 if (Ustrcmp(argrest, "ropcr") == 0)
2416 /* drop_cr = TRUE; */
2419 /* Use an intermediate variable so that we don't set debugging while
2420 decoding the debugging bits. */
2424 unsigned int selector = D_default;
2427 if (*argrest == 'd')
2429 debug_daemon = TRUE;
2433 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2434 debug_options_count, US"debug", 0);
2435 debug_selector = selector;
2440 /* -E: This is a local error message. This option is not intended for
2441 external use at all, but is not restricted to trusted callers because it
2442 does no harm (just suppresses certain error messages) and if Exim is run
2443 not setuid root it won't always be trusted when it generates error
2444 messages using this option. If there is a message id following -E, point
2445 message_reference at it, for logging. */
2448 local_error_message = TRUE;
2449 if (mac_ismsgid(argrest)) message_reference = argrest;
2453 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2454 option, so it looks as if historically the -oex options are also callable
2455 without the leading -o. So we have to accept them. Before the switch,
2456 anything starting -oe has been converted to -e. Exim does not support all
2457 of the sendmail error options. */
2460 if (Ustrcmp(argrest, "e") == 0)
2462 arg_error_handling = ERRORS_SENDER;
2463 errors_sender_rc = EXIT_SUCCESS;
2465 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2466 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2467 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2468 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2473 /* -F: Set sender's full name, used instead of the gecos entry from
2474 the password file. Since users can usually alter their gecos entries,
2475 there's no security involved in using this instead. The data can follow
2476 the -F or be in the next argument. */
2481 if(++i < argc) argrest = argv[i]; else
2482 { badarg = TRUE; break; }
2484 originator_name = argrest;
2485 sender_name_forced = TRUE;
2489 /* -f: Set sender's address - this value is only actually used if Exim is
2490 run by a trusted user, or if untrusted_set_sender is set and matches the
2491 address, except that the null address can always be set by any user. The
2492 test for this happens later, when the value given here is ignored when not
2493 permitted. For an untrusted user, the actual sender is still put in Sender:
2494 if it doesn't match the From: header (unless no_local_from_check is set).
2495 The data can follow the -f or be in the next argument. The -r switch is an
2496 obsolete form of -f but since there appear to be programs out there that
2497 use anything that sendmail has ever supported, better accept it - the
2498 synonymizing is done before the switch above.
2500 At this stage, we must allow domain literal addresses, because we don't
2501 know what the setting of allow_domain_literals is yet. Ditto for trailing
2502 dots and strip_trailing_dot. */
2510 if (i+1 < argc) argrest = argv[++i]; else
2511 { badarg = TRUE; break; }
2515 sender_address = string_sprintf(""); /* Ensure writeable memory */
2519 uschar *temp = argrest + Ustrlen(argrest) - 1;
2520 while (temp >= argrest && isspace(*temp)) temp--;
2521 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2522 allow_domain_literals = TRUE;
2523 strip_trailing_dot = TRUE;
2524 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2525 &sender_address_domain, TRUE);
2526 allow_domain_literals = FALSE;
2527 strip_trailing_dot = FALSE;
2528 if (sender_address == NULL)
2530 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2531 return EXIT_FAILURE;
2534 sender_address_forced = TRUE;
2538 /* -G: sendmail invocation to specify that it's a gateway submission and
2539 sendmail may complain about problems instead of fixing them.
2540 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2541 not at this time complain about problems. */
2547 /* -h: Set the hop count for an incoming message. Exim does not currently
2548 support this; it always computes it by counting the Received: headers.
2549 To put it in will require a change to the spool header file format. */
2554 if(++i < argc) argrest = argv[i]; else
2555 { badarg = TRUE; break; }
2557 if (!isdigit(*argrest)) badarg = TRUE;
2561 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2562 not to be documented for sendmail but mailx (at least) uses it) */
2565 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2569 /* -L: set the identifier used for syslog; equivalent to setting
2570 syslog_processname in the config file, but needs to be an admin option. */
2573 if (*argrest == '\0')
2575 if(++i < argc) argrest = argv[i]; else
2576 { badarg = TRUE; break; }
2578 sz = Ustrlen(argrest);
2581 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2582 return EXIT_FAILURE;
2586 fprintf(stderr, "exim: the -L syslog name is too short\n");
2587 return EXIT_FAILURE;
2589 cmdline_syslog_name = argrest;
2593 receiving_message = FALSE;
2595 /* -MC: continue delivery of another message via an existing open
2596 file descriptor. This option is used for an internal call by the
2597 smtp transport when there is a pending message waiting to go to an
2598 address to which it has got a connection. Five subsequent arguments are
2599 required: transport name, host name, IP address, sequence number, and
2600 message_id. Transports may decline to create new processes if the sequence
2601 number gets too big. The channel is stdin. This (-MC) must be the last
2602 argument. There's a subsequent check that the real-uid is privileged.
2604 If we are running in the test harness. delay for a bit, to let the process
2605 that set this one up complete. This makes for repeatability of the logging,
2608 if (Ustrcmp(argrest, "C") == 0)
2610 union sockaddr_46 interface_sock;
2611 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2615 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2616 return EXIT_FAILURE;
2619 if (msg_action_arg >= 0)
2621 fprintf(stderr, "exim: incompatible arguments\n");
2622 return EXIT_FAILURE;
2625 continue_transport = argv[++i];
2626 continue_hostname = argv[++i];
2627 continue_host_address = argv[++i];
2628 continue_sequence = Uatoi(argv[++i]);
2629 msg_action = MSG_DELIVER;
2630 msg_action_arg = ++i;
2631 forced_delivery = TRUE;
2632 queue_run_pid = passed_qr_pid;
2633 queue_run_pipe = passed_qr_pipe;
2635 if (!mac_ismsgid(argv[i]))
2637 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2639 return EXIT_FAILURE;
2642 /* Set up $sending_ip_address and $sending_port */
2644 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2646 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2650 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2652 return EXIT_FAILURE;
2655 if (running_in_test_harness) millisleep(500);
2659 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2660 precedes -MC (see above). The flag indicates that the host to which
2661 Exim is connected has accepted an AUTH sequence. */
2663 else if (Ustrcmp(argrest, "CA") == 0)
2665 smtp_authenticated = TRUE;
2669 #ifdef EXPERIMENTAL_DSN
2670 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2671 that exim is connected to supports the esmtp extension DSN */
2672 else if (strcmp(argrest, "CD") == 0)
2674 smtp_use_dsn = TRUE;
2679 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2680 it preceded -MC (see above) */
2682 else if (Ustrcmp(argrest, "CP") == 0)
2684 smtp_use_pipelining = TRUE;
2688 /* -MCQ: pass on the pid of the queue-running process that started
2689 this chain of deliveries and the fd of its synchronizing pipe; this
2690 is useful only when it precedes -MC (see above) */
2692 else if (Ustrcmp(argrest, "CQ") == 0)
2694 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2696 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2701 /* -MCS: set the smtp_use_size flag; this is useful only when it
2702 precedes -MC (see above) */
2704 else if (Ustrcmp(argrest, "CS") == 0)
2706 smtp_use_size = TRUE;
2710 /* -MCT: set the tls_offered flag; this is useful only when it
2711 precedes -MC (see above). The flag indicates that the host to which
2712 Exim is connected has offered TLS support. */
2715 else if (Ustrcmp(argrest, "CT") == 0)
2722 /* -M[x]: various operations on the following list of message ids:
2723 -M deliver the messages, ignoring next retry times and thawing
2724 -Mc deliver the messages, checking next retry times, no thawing
2725 -Mf freeze the messages
2726 -Mg give up on the messages
2727 -Mt thaw the messages
2728 -Mrm remove the messages
2729 In the above cases, this must be the last option. There are also the
2730 following options which are followed by a single message id, and which
2731 act on that message. Some of them use the "recipient" addresses as well.
2732 -Mar add recipient(s)
2733 -Mmad mark all recipients delivered
2734 -Mmd mark recipients(s) delivered
2736 -Mset load a message for use with -be
2738 -Mvc show copy (of whole message, in RFC 2822 format)
2743 else if (*argrest == 0)
2745 msg_action = MSG_DELIVER;
2746 forced_delivery = deliver_force_thaw = TRUE;
2748 else if (Ustrcmp(argrest, "ar") == 0)
2750 msg_action = MSG_ADD_RECIPIENT;
2751 one_msg_action = TRUE;
2753 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2754 else if (Ustrcmp(argrest, "es") == 0)
2756 msg_action = MSG_EDIT_SENDER;
2757 one_msg_action = TRUE;
2759 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2760 else if (Ustrcmp(argrest, "g") == 0)
2762 msg_action = MSG_DELIVER;
2763 deliver_give_up = TRUE;
2765 else if (Ustrcmp(argrest, "mad") == 0)
2767 msg_action = MSG_MARK_ALL_DELIVERED;
2769 else if (Ustrcmp(argrest, "md") == 0)
2771 msg_action = MSG_MARK_DELIVERED;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2775 else if (Ustrcmp(argrest, "set") == 0)
2777 msg_action = MSG_LOAD;
2778 one_msg_action = TRUE;
2780 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2781 else if (Ustrcmp(argrest, "vb") == 0)
2783 msg_action = MSG_SHOW_BODY;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "vc") == 0)
2788 msg_action = MSG_SHOW_COPY;
2789 one_msg_action = TRUE;
2791 else if (Ustrcmp(argrest, "vh") == 0)
2793 msg_action = MSG_SHOW_HEADER;
2794 one_msg_action = TRUE;
2796 else if (Ustrcmp(argrest, "vl") == 0)
2798 msg_action = MSG_SHOW_LOG;
2799 one_msg_action = TRUE;
2801 else { badarg = TRUE; break; }
2803 /* All the -Mxx options require at least one message id. */
2805 msg_action_arg = i + 1;
2806 if (msg_action_arg >= argc)
2808 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2809 return EXIT_FAILURE;
2812 /* Some require only message ids to follow */
2814 if (!one_msg_action)
2817 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2819 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2821 return EXIT_FAILURE;
2823 goto END_ARG; /* Remaining args are ids */
2826 /* Others require only one message id, possibly followed by addresses,
2827 which will be handled as normal arguments. */
2831 if (!mac_ismsgid(argv[msg_action_arg]))
2833 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2834 argv[msg_action_arg], arg);
2835 return EXIT_FAILURE;
2842 /* Some programs seem to call the -om option without the leading o;
2843 for sendmail it askes for "me too". Exim always does this. */
2846 if (*argrest != 0) badarg = TRUE;
2850 /* -N: don't do delivery - a debugging option that stops transports doing
2851 their thing. It implies debugging at the D_v level. */
2856 dont_deliver = TRUE;
2857 debug_selector |= D_v;
2858 debug_file = stderr;
2864 /* -n: This means "don't alias" in sendmail, apparently.
2865 For normal invocations, it has no effect.
2866 It may affect some other options. */
2872 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2873 option to the specified value. This form uses long names. We need to handle
2874 -O option=value and -Ooption=value. */
2881 fprintf(stderr, "exim: string expected after -O\n");
2889 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2892 if (*argrest == 'A')
2894 alias_arg = argrest + 1;
2895 if (alias_arg[0] == 0)
2897 if (i+1 < argc) alias_arg = argv[++i]; else
2899 fprintf(stderr, "exim: string expected after -oA\n");
2905 /* -oB: Set a connection message max value for remote deliveries */
2907 else if (*argrest == 'B')
2909 uschar *p = argrest + 1;
2912 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2914 connection_max_messages = 1;
2923 fprintf(stderr, "exim: number expected after -oB\n");
2926 connection_max_messages = Uatoi(p);
2930 /* -odb: background delivery */
2932 else if (Ustrcmp(argrest, "db") == 0)
2934 synchronous_delivery = FALSE;
2935 arg_queue_only = FALSE;
2936 queue_only_set = TRUE;
2939 /* -odf: foreground delivery (smail-compatible option); same effect as
2940 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2943 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2945 synchronous_delivery = TRUE;
2946 arg_queue_only = FALSE;
2947 queue_only_set = TRUE;
2950 /* -odq: queue only */
2952 else if (Ustrcmp(argrest, "dq") == 0)
2954 synchronous_delivery = FALSE;
2955 arg_queue_only = TRUE;
2956 queue_only_set = TRUE;
2959 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2960 but no remote delivery */
2962 else if (Ustrcmp(argrest, "dqs") == 0)
2965 arg_queue_only = FALSE;
2966 queue_only_set = TRUE;
2969 /* -oex: Sendmail error flags. As these are also accepted without the
2970 leading -o prefix, for compatibility with vacation and other callers,
2971 they are handled with -e above. */
2973 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2974 -oitrue: Another sendmail syntax for the same */
2976 else if (Ustrcmp(argrest, "i") == 0 ||
2977 Ustrcmp(argrest, "itrue") == 0)
2980 /* -oM*: Set various characteristics for an incoming message; actually
2981 acted on for trusted callers only. */
2983 else if (*argrest == 'M')
2987 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2991 /* -oMa: Set sender host address */
2993 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2995 /* -oMaa: Set authenticator name */
2997 else if (Ustrcmp(argrest, "Maa") == 0)
2998 sender_host_authenticated = argv[++i];
3000 /* -oMas: setting authenticated sender */
3002 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3004 /* -oMai: setting authenticated id */
3006 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3008 /* -oMi: Set incoming interface address */
3010 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3012 /* -oMm: Message reference */
3014 else if (Ustrcmp(argrest, "Mm") == 0)
3016 if (!mac_ismsgid(argv[i+1]))
3018 fprintf(stderr,"-oMm must be a valid message ID\n");
3021 if (!trusted_config)
3023 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3026 message_reference = argv[++i];
3029 /* -oMr: Received protocol */
3031 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3033 /* -oMs: Set sender host name */
3035 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3037 /* -oMt: Set sender ident */
3039 else if (Ustrcmp(argrest, "Mt") == 0)
3041 sender_ident_set = TRUE;
3042 sender_ident = argv[++i];
3045 /* Else a bad argument */
3054 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3055 seem to call this as -m (undocumented), so that is also accepted (see
3058 else if (Ustrcmp(argrest, "m") == 0) {}
3060 /* -oo: An ancient flag for old-style addresses which still seems to
3061 crop up in some calls (see in SCO). */
3063 else if (Ustrcmp(argrest, "o") == 0) {}
3065 /* -oP <name>: set pid file path for daemon */
3067 else if (Ustrcmp(argrest, "P") == 0)
3068 override_pid_file_path = argv[++i];
3070 /* -or <n>: set timeout for non-SMTP acceptance
3071 -os <n>: set timeout for SMTP acceptance */
3073 else if (*argrest == 'r' || *argrest == 's')
3075 int *tp = (*argrest == 'r')?
3076 &arg_receive_timeout : &arg_smtp_receive_timeout;
3077 if (argrest[1] == 0)
3079 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3081 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3084 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3089 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3091 else if (Ustrcmp(argrest, "X") == 0)
3092 override_local_interfaces = argv[++i];
3094 /* Unknown -o argument */
3100 /* -ps: force Perl startup; -pd force delayed Perl startup */
3104 if (*argrest == 's' && argrest[1] == 0)
3106 perl_start_option = 1;
3109 if (*argrest == 'd' && argrest[1] == 0)
3111 perl_start_option = -1;
3116 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3117 which sets the host protocol and host name */
3121 if (i+1 < argc) argrest = argv[++i]; else
3122 { badarg = TRUE; break; }
3127 uschar *hn = Ustrchr(argrest, ':');
3130 received_protocol = argrest;
3134 received_protocol = string_copyn(argrest, hn - argrest);
3135 sender_host_name = hn + 1;
3142 receiving_message = FALSE;
3143 if (queue_interval >= 0)
3145 fprintf(stderr, "exim: -q specified more than once\n");
3149 /* -qq...: Do queue runs in a 2-stage manner */
3151 if (*argrest == 'q')
3153 queue_2stage = TRUE;
3157 /* -qi...: Do only first (initial) deliveries */
3159 if (*argrest == 'i')
3161 queue_run_first_delivery = TRUE;
3165 /* -qf...: Run the queue, forcing deliveries
3166 -qff..: Ditto, forcing thawing as well */
3168 if (*argrest == 'f')
3170 queue_run_force = TRUE;
3171 if (*(++argrest) == 'f')
3173 deliver_force_thaw = TRUE;
3178 /* -q[f][f]l...: Run the queue only on local deliveries */
3180 if (*argrest == 'l')
3182 queue_run_local = TRUE;
3186 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3187 optionally starting from a given message id. */
3189 if (*argrest == 0 &&
3190 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3193 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3194 start_queue_run_id = argv[++i];
3195 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3196 stop_queue_run_id = argv[++i];
3199 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3200 optionally local only. */
3205 queue_interval = readconf_readtime(argrest, 0, FALSE);
3207 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3208 if (queue_interval <= 0)
3210 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3217 case 'R': /* Synonymous with -qR... */
3218 receiving_message = FALSE;
3220 /* -Rf: As -R (below) but force all deliveries,
3221 -Rff: Ditto, but also thaw all frozen messages,
3222 -Rr: String is regex
3223 -Rrf: Regex and force
3224 -Rrff: Regex and force and thaw
3226 in all cases provided there are no further characters in this
3232 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3234 if (Ustrcmp(argrest, rsopts[i]) == 0)
3236 if (i != 2) queue_run_force = TRUE;
3237 if (i >= 2) deliver_selectstring_regex = TRUE;
3238 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3239 argrest += Ustrlen(rsopts[i]);
3244 /* -R: Set string to match in addresses for forced queue run to
3245 pick out particular messages. */
3249 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3251 fprintf(stderr, "exim: string expected after -R\n");
3255 else deliver_selectstring = argrest;
3259 /* -r: an obsolete synonym for -f (see above) */
3262 /* -S: Like -R but works on sender. */
3264 case 'S': /* Synonymous with -qS... */
3265 receiving_message = FALSE;
3267 /* -Sf: As -S (below) but force all deliveries,
3268 -Sff: Ditto, but also thaw all frozen messages,
3269 -Sr: String is regex
3270 -Srf: Regex and force
3271 -Srff: Regex and force and thaw
3273 in all cases provided there are no further characters in this
3279 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3281 if (Ustrcmp(argrest, rsopts[i]) == 0)
3283 if (i != 2) queue_run_force = TRUE;
3284 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3285 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3286 argrest += Ustrlen(rsopts[i]);
3291 /* -S: Set string to match in addresses for forced queue run to
3292 pick out particular messages. */
3296 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3298 fprintf(stderr, "exim: string expected after -S\n");
3302 else deliver_selectstring_sender = argrest;
3305 /* -Tqt is an option that is exclusively for use by the testing suite.
3306 It is not recognized in other circumstances. It allows for the setting up
3307 of explicit "queue times" so that various warning/retry things can be
3308 tested. Otherwise variability of clock ticks etc. cause problems. */
3311 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3312 fudged_queue_times = argv[++i];
3317 /* -t: Set flag to extract recipients from body of message. */
3320 if (*argrest == 0) extract_recipients = TRUE;
3322 /* -ti: Set flag to extract recipients from body of message, and also
3323 specify that dot does not end the message. */
3325 else if (Ustrcmp(argrest, "i") == 0)
3327 extract_recipients = TRUE;
3331 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3334 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3341 /* -U: This means "initial user submission" in sendmail, apparently. The
3342 doc claims that in future sendmail may refuse syntactically invalid
3343 messages instead of fixing them. For the moment, we just ignore it. */
3349 /* -v: verify things - this is a very low-level debugging */
3354 debug_selector |= D_v;
3355 debug_file = stderr;
3361 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3363 The -x flag tells the sendmail command that mail from a local
3364 mail program has National Language Support (NLS) extended characters
3365 in the body of the mail item. The sendmail command can send mail with
3366 extended NLS characters across networks that normally corrupts these
3369 As Exim is 8-bit clean, it just ignores this flag. */
3372 if (*argrest != 0) badarg = TRUE;
3375 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3376 logs to that file. We swallow the parameter and otherwise ignore it. */
3379 if (*argrest == '\0')
3383 fprintf(stderr, "exim: string expected after -X\n");
3389 /* All other initial characters are errors */
3394 } /* End of high-level switch statement */
3396 /* Failed to recognize the option, or syntax error */
3400 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3401 "option %s\n", arg);
3407 /* If -R or -S have been specified without -q, assume a single queue run. */
3409 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3410 queue_interval < 0) queue_interval = 0;
3414 /* If usage_wanted is set we call the usage function - which never returns */
3415 if (usage_wanted) exim_usage(called_as);
3417 /* Arguments have been processed. Check for incompatibilities. */
3419 (smtp_input || extract_recipients || recipients_arg < argc) &&
3420 (daemon_listen || queue_interval >= 0 || bi_option ||
3421 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3422 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3425 msg_action_arg > 0 &&
3426 (daemon_listen || queue_interval >= 0 || list_options ||
3427 (checking && msg_action != MSG_LOAD) ||
3428 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3431 (daemon_listen || queue_interval >= 0) &&
3432 (sender_address != NULL || list_options || list_queue || checking ||
3436 daemon_listen && queue_interval == 0
3439 inetd_wait_mode && queue_interval >= 0
3443 (checking || smtp_input || extract_recipients ||
3444 filter_test != FTEST_NONE || bi_option)
3447 verify_address_mode &&
3448 (address_test_mode || smtp_input || extract_recipients ||
3449 filter_test != FTEST_NONE || bi_option)
3452 address_test_mode && (smtp_input || extract_recipients ||
3453 filter_test != FTEST_NONE || bi_option)
3456 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3460 deliver_selectstring != NULL && queue_interval < 0
3463 msg_action == MSG_LOAD &&
3464 (!expansion_test || expansion_test_message != NULL)
3468 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3472 /* If debugging is set up, set the file and the file descriptor to pass on to
3473 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3474 to run in the foreground. */
3476 if (debug_selector != 0)
3478 debug_file = stderr;
3479 debug_fd = fileno(debug_file);
3480 background_daemon = FALSE;
3481 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3482 if (debug_selector != D_v) /* -v only doesn't show this */
3484 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3485 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3487 if (!version_printed)
3488 show_whats_supported(stderr);
3492 /* When started with root privilege, ensure that the limits on the number of
3493 open files and the number of processes (where that is accessible) are
3494 sufficiently large, or are unset, in case Exim has been called from an
3495 environment where the limits are screwed down. Not all OS have the ability to
3496 change some of these limits. */
3500 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3506 #ifdef RLIMIT_NOFILE
3507 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3509 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3511 rlp.rlim_cur = rlp.rlim_max = 0;
3514 /* I originally chose 1000 as a nice big number that was unlikely to
3515 be exceeded. It turns out that some older OS have a fixed upper limit of
3518 if (rlp.rlim_cur < 1000)
3520 rlp.rlim_cur = rlp.rlim_max = 1000;
3521 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3523 rlp.rlim_cur = rlp.rlim_max = 256;
3524 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3525 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3532 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3534 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3536 rlp.rlim_cur = rlp.rlim_max = 0;
3539 #ifdef RLIM_INFINITY
3540 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3542 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3544 if (rlp.rlim_cur < 1000)
3546 rlp.rlim_cur = rlp.rlim_max = 1000;
3548 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3549 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3555 /* Exim is normally entered as root (but some special configurations are
3556 possible that don't do this). However, it always spins off sub-processes that
3557 set their uid and gid as required for local delivery. We don't want to pass on
3558 any extra groups that root may belong to, so we want to get rid of them all at
3561 We need to obey setgroups() at this stage, before possibly giving up root
3562 privilege for a changed configuration file, but later on we might need to
3563 check on the additional groups for the admin user privilege - can't do that
3564 till after reading the config, which might specify the exim gid. Therefore,
3565 save the group list here first. */
3567 group_count = getgroups(NGROUPS_MAX, group_list);
3568 if (group_count < 0)
3570 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3574 /* There is a fundamental difference in some BSD systems in the matter of
3575 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3576 known not to be different. On the "different" systems there is a single group
3577 list, and the first entry in it is the current group. On all other versions of
3578 Unix there is a supplementary group list, which is in *addition* to the current
3579 group. Consequently, to get rid of all extraneous groups on a "standard" system
3580 you pass over 0 groups to setgroups(), while on a "different" system you pass
3581 over a single group - the current group, which is always the first group in the
3582 list. Calling setgroups() with zero groups on a "different" system results in
3583 an error return. The following code should cope with both types of system.
3585 However, if this process isn't running as root, setgroups() can't be used
3586 since you have to be root to run it, even if throwing away groups. Not being
3587 root here happens only in some unusual configurations. We just ignore the
3590 if (setgroups(0, NULL) != 0)
3592 if (setgroups(1, group_list) != 0 && !unprivileged)
3594 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3599 /* If the configuration file name has been altered by an argument on the
3600 command line (either a new file name or a macro definition) and the caller is
3601 not root, or if this is a filter testing run, remove any setuid privilege the
3602 program has and run as the underlying user.
3604 The exim user is locked out of this, which severely restricts the use of -C
3607 Otherwise, set the real ids to the effective values (should be root unless run
3608 from inetd, which it can either be root or the exim uid, if one is configured).
3610 There is a private mechanism for bypassing some of this, in order to make it
3611 possible to test lots of configurations automatically, without having either to
3612 recompile each time, or to patch in an actual configuration file name and other
3613 values (such as the path name). If running in the test harness, pretend that
3614 configuration file changes and macro definitions haven't happened. */
3617 (!trusted_config || /* Config changed, or */
3618 !macros_trusted()) && /* impermissible macros and */
3619 real_uid != root_uid && /* Not root, and */
3620 !running_in_test_harness /* Not fudged */
3622 expansion_test /* expansion testing */
3624 filter_test != FTEST_NONE) /* Filter testing */
3626 setgroups(group_count, group_list);
3627 exim_setugid(real_uid, real_gid, FALSE,
3628 US"-C, -D, -be or -bf forces real uid");
3629 removed_privilege = TRUE;
3631 /* In the normal case when Exim is called like this, stderr is available
3632 and should be used for any logging information because attempts to write
3633 to the log will usually fail. To arrange this, we unset really_exim. However,
3634 if no stderr is available there is no point - we might as well have a go
3635 at the log (if it fails, syslog will be written).
3637 Note that if the invoker is Exim, the logs remain available. Messing with
3638 this causes unlogged successful deliveries. */
3640 if ((log_stderr != NULL) && (real_uid != exim_uid))
3641 really_exim = FALSE;
3644 /* Privilege is to be retained for the moment. It may be dropped later,
3645 depending on the job that this Exim process has been asked to do. For now, set
3646 the real uid to the effective so that subsequent re-execs of Exim are done by a
3649 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3651 /* If testing a filter, open the file(s) now, before wasting time doing other
3652 setups and reading the message. */
3654 if ((filter_test & FTEST_SYSTEM) != 0)
3656 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3659 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3661 return EXIT_FAILURE;
3665 if ((filter_test & FTEST_USER) != 0)
3667 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3670 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3672 return EXIT_FAILURE;
3676 /* Initialise lookup_list
3677 If debugging, already called above via version reporting.
3678 In either case, we initialise the list of available lookups while running
3679 as root. All dynamically modules are loaded from a directory which is
3680 hard-coded into the binary and is code which, if not a module, would be
3681 part of Exim already. Ability to modify the content of the directory
3682 is equivalent to the ability to modify a setuid binary!
3684 This needs to happen before we read the main configuration. */
3687 /* Read the main runtime configuration data; this gives up if there
3688 is a failure. It leaves the configuration file open so that the subsequent
3689 configuration data for delivery can be read if needed. */
3693 /* If an action on specific messages is requested, or if a daemon or queue
3694 runner is being started, we need to know if Exim was called by an admin user.
3695 This is the case if the real user is root or exim, or if the real group is
3696 exim, or if one of the supplementary groups is exim or a group listed in
3697 admin_groups. We don't fail all message actions immediately if not admin_user,
3698 since some actions can be performed by non-admin users. Instead, set admin_user
3699 for later interrogation. */
3701 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3706 for (i = 0; i < group_count; i++)
3708 if (group_list[i] == exim_gid) admin_user = TRUE;
3709 else if (admin_groups != NULL)
3711 for (j = 1; j <= (int)(admin_groups[0]); j++)
3712 if (admin_groups[j] == group_list[i])
3713 { admin_user = TRUE; break; }
3715 if (admin_user) break;
3719 /* Another group of privileged users are the trusted users. These are root,
3720 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3721 are permitted to specify sender_addresses with -f on the command line, and
3722 other message parameters as well. */
3724 if (real_uid == root_uid || real_uid == exim_uid)
3725 trusted_caller = TRUE;
3730 if (trusted_users != NULL)
3732 for (i = 1; i <= (int)(trusted_users[0]); i++)
3733 if (trusted_users[i] == real_uid)
3734 { trusted_caller = TRUE; break; }
3737 if (!trusted_caller && trusted_groups != NULL)
3739 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3741 if (trusted_groups[i] == real_gid)
3742 trusted_caller = TRUE;
3743 else for (j = 0; j < group_count; j++)
3745 if (trusted_groups[i] == group_list[j])
3746 { trusted_caller = TRUE; break; }
3748 if (trusted_caller) break;
3753 /* Handle the decoding of logging options. */
3755 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3756 log_selector_string, log_options, log_options_count, US"log", 0);
3760 debug_printf("configuration file is %s\n", config_main_filename);
3761 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3762 log_extra_selector);
3765 /* If domain literals are not allowed, check the sender address that was
3766 supplied with -f. Ditto for a stripped trailing dot. */
3768 if (sender_address != NULL)
3770 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3772 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3773 "allowed\n", sender_address);
3774 return EXIT_FAILURE;
3776 if (f_end_dot && !strip_trailing_dot)
3778 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3779 "(trailing dot not allowed)\n", sender_address);
3780 return EXIT_FAILURE;
3784 /* See if an admin user overrode our logging. */
3786 if (cmdline_syslog_name != NULL)
3790 syslog_processname = cmdline_syslog_name;
3791 log_file_path = string_copy(CUS"syslog");
3795 /* not a panic, non-privileged users should not be able to spam paniclog */
3797 "exim: you lack sufficient privilege to specify syslog process name\n");
3798 return EXIT_FAILURE;
3802 /* Paranoia check of maximum lengths of certain strings. There is a check
3803 on the length of the log file path in log.c, which will come into effect
3804 if there are any calls to write the log earlier than this. However, if we
3805 get this far but the string is very long, it is better to stop now than to
3806 carry on and (e.g.) receive a message and then have to collapse. The call to
3807 log_write() from here will cause the ultimate panic collapse if the complete
3808 file name exceeds the buffer length. */
3810 if (Ustrlen(log_file_path) > 200)
3811 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3812 "log_file_path is longer than 200 chars: aborting");
3814 if (Ustrlen(pid_file_path) > 200)
3815 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3816 "pid_file_path is longer than 200 chars: aborting");
3818 if (Ustrlen(spool_directory) > 200)
3819 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3820 "spool_directory is longer than 200 chars: aborting");
3822 /* Length check on the process name given to syslog for its TAG field,
3823 which is only permitted to be 32 characters or less. See RFC 3164. */
3825 if (Ustrlen(syslog_processname) > 32)
3826 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3827 "syslog_processname is longer than 32 chars: aborting");
3829 /* In some operating systems, the environment variable TMPDIR controls where
3830 temporary files are created; Exim doesn't use these (apart from when delivering
3831 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3832 If TMPDIR is found in the environment, reset it to the value defined in the
3833 TMPDIR macro, if this macro is defined. */
3838 for (p = USS environ; *p != NULL; p++)
3840 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3841 Ustrcmp(*p+7, TMPDIR) != 0)
3843 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3844 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3846 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3852 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3853 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3854 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3855 called by a user who has set the TZ variable. This then affects the timestamps
3856 in log files and in Received: headers, and any created Date: header lines. The
3857 required timezone is settable in the configuration file, so nothing can be done
3858 about this earlier - but hopefully nothing will normally be logged earlier than
3859 this. We have to make a new environment if TZ is wrong, but don't bother if
3860 timestamps_utc is set, because then all times are in UTC anyway. */
3862 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3864 timestamps_utc = TRUE;
3868 uschar *envtz = US getenv("TZ");
3869 if ((envtz == NULL && timezone_string != NULL) ||
3871 (timezone_string == NULL ||
3872 Ustrcmp(timezone_string, envtz) != 0)))
3874 uschar **p = USS environ;
3878 while (*p++ != NULL) count++;
3879 if (envtz == NULL) count++;
3880 newp = new = malloc(sizeof(uschar *) * (count + 1));
3881 for (p = USS environ; *p != NULL; p++)
3883 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3886 if (timezone_string != NULL)
3888 *newp = malloc(Ustrlen(timezone_string) + 4);
3889 sprintf(CS *newp++, "TZ=%s", timezone_string);
3894 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3895 tod_stamp(tod_log));
3899 /* Handle the case when we have removed the setuid privilege because of -C or
3900 -D. This means that the caller of Exim was not root.
3902 There is a problem if we were running as the Exim user. The sysadmin may
3903 expect this case to retain privilege because "the binary was called by the
3904 Exim user", but it hasn't, because either the -D option set macros, or the
3905 -C option set a non-trusted configuration file. There are two possibilities:
3907 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3908 to do message deliveries. Thus, the fact that it is running as a
3909 non-privileged user is plausible, and might be wanted in some special
3910 configurations. However, really_exim will have been set false when
3911 privilege was dropped, to stop Exim trying to write to its normal log
3912 files. Therefore, re-enable normal log processing, assuming the sysadmin
3913 has set up the log directory correctly.
3915 (2) If deliver_drop_privilege is not set, the configuration won't work as
3916 apparently intended, and so we log a panic message. In order to retain
3917 root for -C or -D, the caller must either be root or be invoking a
3918 trusted configuration file (when deliver_drop_privilege is false). */
3920 if (removed_privilege && (!trusted_config || macros != NULL) &&
3921 real_uid == exim_uid)
3923 if (deliver_drop_privilege)
3924 really_exim = TRUE; /* let logging work normally */
3926 log_write(0, LOG_MAIN|LOG_PANIC,
3927 "exim user lost privilege for using %s option",
3928 trusted_config? "-D" : "-C");
3931 /* Start up Perl interpreter if Perl support is configured and there is a
3932 perl_startup option, and the configuration or the command line specifies
3933 initializing starting. Note that the global variables are actually called
3934 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3937 if (perl_start_option != 0)
3938 opt_perl_at_start = (perl_start_option > 0);
3939 if (opt_perl_at_start && opt_perl_startup != NULL)
3942 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3943 errstr = init_perl(opt_perl_startup);
3946 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3947 return EXIT_FAILURE;
3949 opt_perl_started = TRUE;
3951 #endif /* EXIM_PERL */
3953 /* Log the arguments of the call if the configuration file said so. This is
3954 a debugging feature for finding out what arguments certain MUAs actually use.
3955 Don't attempt it if logging is disabled, or if listing variables or if
3956 verifying/testing addresses or expansions. */
3958 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3959 && really_exim && !list_options && !checking)
3962 uschar *p = big_buffer;
3964 Ustrcpy(p, "cwd= (failed)");
3965 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3967 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3969 for (i = 0; i < argc; i++)
3971 int len = Ustrlen(argv[i]);
3974 if (p + len + 8 >= big_buffer + big_buffer_size)
3977 log_write(0, LOG_MAIN, "%s", big_buffer);
3978 Ustrcpy(big_buffer, "...");
3981 printing = string_printing(argv[i]);
3982 if (printing[0] == 0) quote = US"\""; else
3984 uschar *pp = printing;
3986 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3988 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3989 (p - big_buffer) - 4), printing, quote);
3993 if ((log_extra_selector & LX_arguments) != 0)
3994 log_write(0, LOG_MAIN, "%s", big_buffer);
3996 debug_printf("%s\n", big_buffer);
3999 /* Set the working directory to be the top-level spool directory. We don't rely
4000 on this in the code, which always uses fully qualified names, but it's useful
4001 for core dumps etc. Don't complain if it fails - the spool directory might not
4002 be generally accessible and calls with the -C option (and others) have lost
4003 privilege by now. Before the chdir, we try to ensure that the directory exists.
4006 if (Uchdir(spool_directory) != 0)
4009 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4010 dummy = /* quieten compiler */ Uchdir(spool_directory);
4013 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4014 alias file. Exim doesn't have such a concept, but this call is screwed into
4015 Sun's YP makefiles. Handle this by calling a configured script, as the real
4016 user who called Exim. The -oA option can be used to pass an argument to the
4021 (void)fclose(config_file);
4022 if (bi_command != NULL)
4026 argv[i++] = bi_command;
4027 if (alias_arg != NULL) argv[i++] = alias_arg;
4030 setgroups(group_count, group_list);
4031 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4033 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4034 (argv[1] == NULL)? US"" : argv[1]);
4036 execv(CS argv[0], (char *const *)argv);
4037 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4042 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4047 /* We moved the admin/trusted check to be immediately after reading the
4048 configuration file. We leave these prints here to ensure that syslog setup,
4049 logfile setup, and so on has already happened. */
4051 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4052 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4054 /* Only an admin user may start the daemon or force a queue run in the default
4055 configuration, but the queue run restriction can be relaxed. Only an admin
4056 user may request that a message be returned to its sender forthwith. Only an
4057 admin user may specify a debug level greater than D_v (because it might show
4058 passwords, etc. in lookup queries). Only an admin user may request a queue
4059 count. Only an admin user can use the test interface to scan for email
4060 (because Exim will be in the spool dir and able to look at mails). */
4064 BOOL debugset = (debug_selector & ~D_v) != 0;
4065 if (deliver_give_up || daemon_listen || malware_test_file ||
4066 (count_queue && queue_list_requires_admin) ||
4067 (list_queue && queue_list_requires_admin) ||
4068 (queue_interval >= 0 && prod_requires_admin) ||
4069 (debugset && !running_in_test_harness))
4071 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4076 /* If the real user is not root or the exim uid, the argument for passing
4077 in an open TCP/IP connection for another message is not permitted, nor is
4078 running with the -N option for any delivery action, unless this call to exim is
4079 one that supplied an input message, or we are using a patched exim for
4080 regression testing. */
4082 if (real_uid != root_uid && real_uid != exim_uid &&
4083 (continue_hostname != NULL ||
4085 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4086 )) && !running_in_test_harness)
4088 fprintf(stderr, "exim: Permission denied\n");
4089 return EXIT_FAILURE;
4092 /* If the caller is not trusted, certain arguments are ignored when running for
4093 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4094 Note that authority for performing certain actions on messages is tested in the
4095 queue_action() function. */
4097 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4099 sender_host_name = sender_host_address = interface_address =
4100 sender_ident = received_protocol = NULL;
4101 sender_host_port = interface_port = 0;
4102 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4105 /* If a sender host address is set, extract the optional port number off the
4106 end of it and check its syntax. Do the same thing for the interface address.
4107 Exim exits if the syntax is bad. */
4111 if (sender_host_address != NULL)
4112 sender_host_port = check_port(sender_host_address);
4113 if (interface_address != NULL)
4114 interface_port = check_port(interface_address);
4117 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4122 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4123 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4127 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4128 return EXIT_FAILURE;
4132 /* If an SMTP message is being received check to see if the standard input is a
4133 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4134 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4139 union sockaddr_46 inetd_sock;
4140 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4141 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4143 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4144 if (family == AF_INET || family == AF_INET6)
4146 union sockaddr_46 interface_sock;
4147 size = sizeof(interface_sock);
4149 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4150 interface_address = host_ntoa(-1, &interface_sock, NULL,
4153 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4155 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4158 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4159 NULL, &sender_host_port);
4160 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4161 "inetd is not supported when mua_wrapper is set");
4166 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4167 return EXIT_FAILURE;
4173 /* If the load average is going to be needed while receiving a message, get it
4174 now for those OS that require the first call to os_getloadavg() to be done as
4175 root. There will be further calls later for each message received. */
4177 #ifdef LOAD_AVG_NEEDS_ROOT
4178 if (receiving_message &&
4179 (queue_only_load >= 0 ||
4180 (is_inetd && smtp_load_reserve >= 0)
4183 load_average = OS_GETLOADAVG();
4187 /* The queue_only configuration option can be overridden by -odx on the command
4188 line, except that if queue_only_override is false, queue_only cannot be unset
4189 from the command line. */
4191 if (queue_only_set && (queue_only_override || arg_queue_only))
4192 queue_only = arg_queue_only;
4194 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4197 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4198 if (arg_smtp_receive_timeout >= 0)
4199 smtp_receive_timeout = arg_smtp_receive_timeout;
4201 /* If Exim was started with root privilege, unless we have already removed the
4202 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4203 except when starting the daemon or doing some kind of delivery or address
4204 testing (-bt). These are the only cases when root need to be retained. We run
4205 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4206 retained only for starting the daemon. We always do the initgroups() in this
4207 situation (controlled by the TRUE below), in order to be as close as possible
4208 to the state Exim usually runs in. */
4210 if (!unprivileged && /* originally had root AND */
4211 !removed_privilege && /* still got root AND */
4212 !daemon_listen && /* not starting the daemon */
4213 queue_interval <= 0 && /* (either kind of daemon) */
4215 deliver_drop_privilege || /* requested unprivileged */
4217 queue_interval < 0 && /* not running the queue */
4218 (msg_action_arg < 0 || /* and */
4219 msg_action != MSG_DELIVER) && /* not delivering and */
4220 (!checking || !address_test_mode) /* not address checking */
4224 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4227 /* When we are retaining a privileged uid, we still change to the exim gid. */
4232 rv = setgid(exim_gid);
4233 /* Impact of failure is that some stuff might end up with an incorrect group.
4234 We track this for failures from root, since any attempt to change privilege
4235 by root should succeed and failures should be examined. For non-root,
4236 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4237 no need to complain then. */
4240 if (!(unprivileged || removed_privilege))
4243 "exim: changing group failed: %s\n", strerror(errno));
4247 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4248 (long int)exim_gid, strerror(errno));
4252 /* Handle a request to scan a file for malware */
4253 if (malware_test_file)
4255 #ifdef WITH_CONTENT_SCAN
4257 set_process_info("scanning file for malware");
4258 result = malware_in_file(malware_test_file);
4261 printf("No malware found.\n");
4266 printf("Malware lookup returned non-okay/fail: %d\n", result);
4270 printf("Malware found: %s\n", malware_name);
4272 printf("Malware scan detected malware of unknown name.\n");
4274 printf("Malware scanning not enabled at compile time.\n");
4279 /* Handle a request to list the delivery queue */
4283 set_process_info("listing the queue");
4284 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4288 /* Handle a request to count the delivery queue */
4292 set_process_info("counting the queue");
4297 /* Handle actions on specific messages, except for the force delivery and
4298 message load actions, which are done below. Some actions take a whole list of
4299 message ids, which are known to continue up to the end of the arguments. Others
4300 take a single message id and then operate on the recipients list. */
4302 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4304 int yield = EXIT_SUCCESS;
4305 set_process_info("acting on specified messages");
4307 if (!one_msg_action)
4309 for (i = msg_action_arg; i < argc; i++)
4310 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4311 yield = EXIT_FAILURE;
4314 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4315 recipients_arg)) yield = EXIT_FAILURE;
4319 /* We used to set up here to skip reading the ACL section, on
4320 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4321 Now, since the intro of the ${acl } expansion, ACL definitions may be
4322 needed in transports so we lost the optimisation. */
4326 /* The configuration data will have been read into POOL_PERM because we won't
4327 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4328 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4329 configuration were read into POOL_MAIN, because we don't do any resets till
4330 later on. However, it seems right, and it does ensure that both pools get used.
4333 store_pool = POOL_MAIN;
4335 /* Handle the -brt option. This is for checking out retry configurations.
4336 The next three arguments are a domain name or a complete address, and
4337 optionally two error numbers. All it does is to call the function that
4338 scans the retry configuration data. */
4340 if (test_retry_arg >= 0)
4342 retry_config *yield;
4343 int basic_errno = 0;
4347 if (test_retry_arg >= argc)
4349 printf("-brt needs a domain or address argument\n");
4350 exim_exit(EXIT_FAILURE);
4352 s1 = argv[test_retry_arg++];
4355 /* If the first argument contains no @ and no . it might be a local user
4356 or it might be a single-component name. Treat as a domain. */
4358 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4360 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4361 "being \ntreated as a one-component domain, not as a local part.\n\n",
4365 /* There may be an optional second domain arg. */
4367 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4368 s2 = argv[test_retry_arg++];
4370 /* The final arg is an error name */
4372 if (test_retry_arg < argc)
4374 uschar *ss = argv[test_retry_arg];
4376 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4379 printf("%s\n", CS error);
4380 return EXIT_FAILURE;
4383 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4384 code > 100 as an error is for matching codes to the decade. Turn them into
4385 a real error code, off the decade. */
4387 if (basic_errno == ERRNO_MAIL4XX ||
4388 basic_errno == ERRNO_RCPT4XX ||
4389 basic_errno == ERRNO_DATA4XX)
4391 int code = (more_errno >> 8) & 255;
4393 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4394 else if (code > 100)
4395 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4399 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4400 if (yield == NULL) printf("No retry information found\n"); else
4403 more_errno = yield->more_errno;
4404 printf("Retry rule: %s ", yield->pattern);
4406 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4408 printf("quota%s%s ",
4409 (more_errno > 0)? "_" : "",
4410 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4412 else if (yield->basic_errno == ECONNREFUSED)
4414 printf("refused%s%s ",
4415 (more_errno > 0)? "_" : "",
4416 (more_errno == 'M')? "MX" :
4417 (more_errno == 'A')? "A" : "");
4419 else if (yield->basic_errno == ETIMEDOUT)
4422 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4424 if (more_errno != 0) printf("_%s",
4425 (more_errno == 'M')? "MX" : "A");
4428 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4429 printf("auth_failed ");
4432 for (r = yield->rules; r != NULL; r = r->next)
4434 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4435 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4441 printf(",%d.", x/1000);
4455 exim_exit(EXIT_SUCCESS);
4458 /* Handle a request to list one or more configuration options */
4459 /* If -n was set, we suppress some information */
4463 set_process_info("listing variables");
4464 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4465 else for (i = recipients_arg; i < argc; i++)
4468 (Ustrcmp(argv[i], "router") == 0 ||
4469 Ustrcmp(argv[i], "transport") == 0 ||
4470 Ustrcmp(argv[i], "authenticator") == 0 ||
4471 Ustrcmp(argv[i], "macro") == 0))
4473 readconf_print(argv[i+1], argv[i], flag_n);
4476 else readconf_print(argv[i], NULL, flag_n);
4478 exim_exit(EXIT_SUCCESS);
4482 /* Handle a request to deliver one or more messages that are already on the
4483 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4484 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4486 Delivery of specific messages is typically used for a small number when
4487 prodding by hand (when the option forced_delivery will be set) or when
4488 re-execing to regain root privilege. Each message delivery must happen in a
4489 separate process, so we fork a process for each one, and run them sequentially
4490 so that debugging output doesn't get intertwined, and to avoid spawning too
4491 many processes if a long list is given. However, don't fork for the last one;
4492 this saves a process in the common case when Exim is called to deliver just one
4495 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4497 if (prod_requires_admin && !admin_user)
4499 fprintf(stderr, "exim: Permission denied\n");
4500 exim_exit(EXIT_FAILURE);
4502 set_process_info("delivering specified messages");
4503 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4504 for (i = msg_action_arg; i < argc; i++)
4509 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4510 else if ((pid = fork()) == 0)
4512 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4513 _exit(EXIT_SUCCESS);
4517 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4519 exim_exit(EXIT_FAILURE);
4523 exim_exit(EXIT_SUCCESS);
4527 /* If only a single queue run is requested, without SMTP listening, we can just
4528 turn into a queue runner, with an optional starting message id. */
4530 if (queue_interval == 0 && !daemon_listen)
4532 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4533 (start_queue_run_id == NULL)? US"" : US" starting at ",
4534 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4535 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4536 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4537 set_process_info("running the queue (single queue run)");
4538 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4539 exim_exit(EXIT_SUCCESS);
4543 /* Find the login name of the real user running this process. This is always
4544 needed when receiving a message, because it is written into the spool file. It
4545 may also be used to construct a from: or a sender: header, and in this case we
4546 need the user's full name as well, so save a copy of it, checked for RFC822
4547 syntax and munged if necessary, if it hasn't previously been set by the -F
4548 argument. We may try to get the passwd entry more than once, in case NIS or
4549 other delays are in evidence. Save the home directory for use in filter testing
4554 if ((pw = getpwuid(real_uid)) != NULL)
4556 originator_login = string_copy(US pw->pw_name);
4557 originator_home = string_copy(US pw->pw_dir);
4559 /* If user name has not been set by -F, set it from the passwd entry
4560 unless -f has been used to set the sender address by a trusted user. */
4562 if (originator_name == NULL)
4564 if (sender_address == NULL ||
4565 (!trusted_caller && filter_test == FTEST_NONE))
4567 uschar *name = US pw->pw_gecos;
4568 uschar *amp = Ustrchr(name, '&');
4571 /* Most Unix specify that a '&' character in the gecos field is
4572 replaced by a copy of the login name, and some even specify that
4573 the first character should be upper cased, so that's what we do. */
4578 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4579 amp - name, name, &loffset, originator_login, amp + 1);
4580 buffer[loffset] = toupper(buffer[loffset]);
4584 /* If a pattern for matching the gecos field was supplied, apply
4585 it and then expand the name string. */
4587 if (gecos_pattern != NULL && gecos_name != NULL)
4590 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4592 if (regex_match_and_setup(re, name, 0, -1))
4594 uschar *new_name = expand_string(gecos_name);
4596 if (new_name != NULL)
4598 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4599 "gecos field \"%s\"\n", new_name, name);
4602 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4603 "\"%s\": %s\n", gecos_name, expand_string_message);
4605 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4606 "gecos field \"%s\"\n", gecos_pattern, name);
4607 store_free((void *)re);
4609 originator_name = string_copy(name);
4612 /* A trusted caller has used -f but not -F */
4614 else originator_name = US"";
4617 /* Break the retry loop */
4622 if (++i > finduser_retries) break;
4626 /* If we cannot get a user login, log the incident and give up, unless the
4627 configuration specifies something to use. When running in the test harness,
4628 any setting of unknown_login overrides the actual name. */
4630 if (originator_login == NULL || running_in_test_harness)
4632 if (unknown_login != NULL)
4634 originator_login = expand_string(unknown_login);
4635 if (originator_name == NULL && unknown_username != NULL)
4636 originator_name = expand_string(unknown_username);
4637 if (originator_name == NULL) originator_name = US"";
4639 if (originator_login == NULL)
4640 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4644 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4647 originator_name = string_copy(parse_fix_phrase(originator_name,
4648 Ustrlen(originator_name), big_buffer, big_buffer_size));
4650 /* If a message is created by this call of Exim, the uid/gid of its originator
4651 are those of the caller. These values are overridden if an existing message is
4652 read in from the spool. */
4654 originator_uid = real_uid;
4655 originator_gid = real_gid;
4657 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4658 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4660 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4661 returns. We leave this till here so that the originator_ fields are available
4662 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4665 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4669 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4670 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4671 "mua_wrapper is set");
4676 /* If the sender ident has not been set (by a trusted caller) set it to
4677 the caller. This will get overwritten below for an inetd call. If a trusted
4678 caller has set it empty, unset it. */
4680 if (sender_ident == NULL) sender_ident = originator_login;
4681 else if (sender_ident[0] == 0) sender_ident = NULL;
4683 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4684 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4685 originator_* variables set. */
4687 if (test_rewrite_arg >= 0)
4689 really_exim = FALSE;
4690 if (test_rewrite_arg >= argc)
4692 printf("-brw needs an address argument\n");
4693 exim_exit(EXIT_FAILURE);
4695 rewrite_test(argv[test_rewrite_arg]);
4696 exim_exit(EXIT_SUCCESS);
4699 /* A locally-supplied message is considered to be coming from a local user
4700 unless a trusted caller supplies a sender address with -f, or is passing in the
4701 message via SMTP (inetd invocation or otherwise). */
4703 if ((sender_address == NULL && !smtp_input) ||
4704 (!trusted_caller && filter_test == FTEST_NONE))
4706 sender_local = TRUE;
4708 /* A trusted caller can supply authenticated_sender and authenticated_id
4709 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4710 defaults except when host checking. */
4712 if (authenticated_sender == NULL && !host_checking)
4713 authenticated_sender = string_sprintf("%s@%s", originator_login,
4714 qualify_domain_sender);
4715 if (authenticated_id == NULL && !host_checking)
4716 authenticated_id = originator_login;
4719 /* Trusted callers are always permitted to specify the sender address.
4720 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4721 is specified is the empty address. However, if a trusted caller does not
4722 specify a sender address for SMTP input, we leave sender_address unset. This
4723 causes the MAIL commands to be honoured. */
4725 if ((!smtp_input && sender_address == NULL) ||
4726 !receive_check_set_sender(sender_address))
4728 /* Either the caller is not permitted to set a general sender, or this is
4729 non-SMTP input and the trusted caller has not set a sender. If there is no
4730 sender, or if a sender other than <> is set, override with the originator's
4731 login (which will get qualified below), except when checking things. */
4733 if (sender_address == NULL /* No sender_address set */
4735 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4736 !checking && /* Not running tests, AND */
4737 filter_test == FTEST_NONE)) /* Not testing a filter */
4739 sender_address = originator_login;
4740 sender_address_forced = FALSE;
4741 sender_address_domain = 0;
4745 /* Remember whether an untrusted caller set the sender address */
4747 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4749 /* Ensure that the sender address is fully qualified unless it is the empty
4750 address, which indicates an error message, or doesn't exist (root caller, smtp
4751 interface, no -f argument). */
4753 if (sender_address != NULL && sender_address[0] != 0 &&
4754 sender_address_domain == 0)
4755 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4756 qualify_domain_sender);
4758 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4760 /* Handle a request to verify a list of addresses, or test them for delivery.
4761 This must follow the setting of the sender address, since routers can be
4762 predicated upon the sender. If no arguments are given, read addresses from
4763 stdin. Set debug_level to at least D_v to get full output for address testing.
4766 if (verify_address_mode || address_test_mode)
4769 int flags = vopt_qualify;
4771 if (verify_address_mode)
4773 if (!verify_as_sender) flags |= vopt_is_recipient;
4774 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4779 flags |= vopt_is_recipient;
4780 debug_selector |= D_v;
4781 debug_file = stderr;
4782 debug_fd = fileno(debug_file);
4783 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4786 if (recipients_arg < argc)
4788 while (recipients_arg < argc)
4790 uschar *s = argv[recipients_arg++];
4793 BOOL finished = FALSE;
4794 uschar *ss = parse_find_address_end(s, FALSE);
4795 if (*ss == ',') *ss = 0; else finished = TRUE;
4796 test_address(s, flags, &exit_value);
4799 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4806 uschar *s = get_stdinput(NULL, NULL);
4807 if (s == NULL) break;
4808 test_address(s, flags, &exit_value);
4812 exim_exit(exit_value);
4815 /* Handle expansion checking. Either expand items on the command line, or read
4816 from stdin if there aren't any. If -Mset was specified, load the message so
4817 that its variables can be used, but restrict this facility to admin users.
4818 Otherwise, if -bem was used, read a message from stdin. */
4822 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4824 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4827 fprintf(stderr, "exim: permission denied\n");
4830 message_id = argv[msg_action_arg];
4831 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4832 if (!spool_open_datafile(message_id))
4833 printf ("Failed to load message datafile %s\n", message_id);
4834 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4835 printf ("Failed to load message %s\n", message_id);
4838 /* Read a test message from a file. We fudge it up to be on stdin, saving
4839 stdin itself for later reading of expansion strings. */
4841 else if (expansion_test_message != NULL)
4843 int save_stdin = dup(0);
4844 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4847 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4849 return EXIT_FAILURE;
4852 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4853 message_ended = END_NOTENDED;
4854 read_message_body(receive_msg(extract_recipients));
4855 message_linecount += body_linecount;
4856 (void)dup2(save_stdin, 0);
4857 (void)close(save_stdin);
4858 clearerr(stdin); /* Required by Darwin */
4861 /* Allow $recipients for this testing */
4863 enable_dollar_recipients = TRUE;
4865 /* Expand command line items */
4867 if (recipients_arg < argc)
4869 while (recipients_arg < argc)
4871 uschar *s = argv[recipients_arg++];
4872 uschar *ss = expand_string(s);
4873 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4874 else printf("%s\n", CS ss);
4882 char *(*fn_readline)(const char *) = NULL;
4883 void (*fn_addhist)(const char *) = NULL;
4886 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4892 uschar *source = get_stdinput(fn_readline, fn_addhist);
4893 if (source == NULL) break;
4894 ss = expand_string(source);
4896 printf ("Failed: %s\n", expand_string_message);
4897 else printf("%s\n", CS ss);
4901 if (dlhandle != NULL) dlclose(dlhandle);
4905 /* The data file will be open after -Mset */
4907 if (deliver_datafile >= 0)
4909 (void)close(deliver_datafile);
4910 deliver_datafile = -1;
4913 exim_exit(EXIT_SUCCESS);
4917 /* The active host name is normally the primary host name, but it can be varied
4918 for hosts that want to play several parts at once. We need to ensure that it is
4919 set for host checking, and for receiving messages. */
4921 smtp_active_hostname = primary_hostname;
4922 if (raw_active_hostname != NULL)
4924 uschar *nah = expand_string(raw_active_hostname);
4927 if (!expand_string_forcedfail)
4928 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4929 "(smtp_active_hostname): %s", raw_active_hostname,
4930 expand_string_message);
4932 else if (nah[0] != 0) smtp_active_hostname = nah;
4935 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4936 given IP address so that the blocking and relay configuration can be tested.
4937 Unless a sender_ident was set by -oMt, we discard it (the default is the
4938 caller's login name). An RFC 1413 call is made only if we are running in the
4939 test harness and an incoming interface and both ports are specified, because
4940 there is no TCP/IP call to find the ident for. */
4947 if (!sender_ident_set)
4949 sender_ident = NULL;
4950 if (running_in_test_harness && sender_host_port != 0 &&
4951 interface_address != NULL && interface_port != 0)
4952 verify_get_ident(1413);
4955 /* In case the given address is a non-canonical IPv6 address, canonicize
4956 it. The code works for both IPv4 and IPv6, as it happens. */
4958 size = host_aton(sender_host_address, x);
4959 sender_host_address = store_get(48); /* large enough for full IPv6 */
4960 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4962 /* Now set up for testing */
4964 host_build_sender_fullhost();
4968 sender_local = FALSE;
4969 sender_host_notsocket = TRUE;
4970 debug_file = stderr;
4971 debug_fd = fileno(debug_file);
4972 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4973 "**** but without any ident (RFC 1413) callback.\n"
4974 "**** This is not for real!\n\n",
4975 sender_host_address);
4977 if (verify_check_host(&hosts_connection_nolog) == OK)
4978 log_write_selector &= ~L_smtp_connection;
4979 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4981 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4982 because a log line has already been written for all its failure exists
4983 (usually "connection refused: <reason>") and writing another one is
4984 unnecessary clutter. */
4986 if (smtp_start_session())
4988 reset_point = store_get(0);
4991 store_reset(reset_point);
4992 if (smtp_setup_msg() <= 0) break;
4993 if (!receive_msg(FALSE)) break;
4997 exim_exit(EXIT_SUCCESS);
5001 /* Arrange for message reception if recipients or SMTP were specified;
5002 otherwise complain unless a version print (-bV) happened or this is a filter
5003 verification test or info dump.
5004 In the former case, show the configuration file name. */
5006 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5008 if (version_printed)
5010 printf("Configuration file is %s\n", config_main_filename);
5011 return EXIT_SUCCESS;
5014 if (info_flag != CMDINFO_NONE)
5016 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5017 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5020 if (filter_test == FTEST_NONE)
5021 exim_usage(called_as);
5025 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5026 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5027 that we are not called from inetd, because that is rejected above. The
5028 following configuration settings are forced here:
5030 (1) Synchronous delivery (-odi)
5031 (2) Errors to stderr (-oep == -oeq)
5032 (3) No parallel remote delivery
5033 (4) Unprivileged delivery
5035 We don't force overall queueing options because there are several of them;
5036 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5037 to override any SMTP queueing. */
5041 synchronous_delivery = TRUE;
5042 arg_error_handling = ERRORS_STDERR;
5043 remote_max_parallel = 1;
5044 deliver_drop_privilege = TRUE;
5046 queue_smtp_domains = NULL;
5050 /* Prepare to accept one or more new messages on the standard input. When a
5051 message has been read, its id is returned in message_id[]. If doing immediate
5052 delivery, we fork a delivery process for each received message, except for the
5053 last one, where we can save a process switch.
5055 It is only in non-smtp mode that error_handling is allowed to be changed from
5056 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5057 sendmail error modes other than -oem ever actually used? Later: yes.) */
5059 if (!smtp_input) error_handling = arg_error_handling;
5061 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5062 logging being sent down the socket and make an identd call to get the
5067 (void)fclose(stderr);
5068 exim_nullstd(); /* Re-open to /dev/null */
5069 verify_get_ident(IDENT_PORT);
5070 host_build_sender_fullhost();
5071 set_process_info("handling incoming connection from %s via inetd",
5075 /* If the sender host address has been set, build sender_fullhost if it hasn't
5076 already been done (which it will have been for inetd). This caters for the
5077 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5078 so that the test for IP options is skipped for -bs input. */
5080 if (sender_host_address != NULL && sender_fullhost == NULL)
5082 host_build_sender_fullhost();
5083 set_process_info("handling incoming connection from %s via -oMa",
5085 sender_host_notsocket = TRUE;
5088 /* Otherwise, set the sender host as unknown except for inetd calls. This
5089 prevents host checking in the case of -bs not from inetd and also for -bS. */
5091 else if (!is_inetd) sender_host_unknown = TRUE;
5093 /* If stdout does not exist, then dup stdin to stdout. This can happen
5094 if exim is started from inetd. In this case fd 0 will be set to the socket,
5095 but fd 1 will not be set. This also happens for passed SMTP channels. */
5097 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5099 /* Set up the incoming protocol name and the state of the program. Root is
5100 allowed to force received protocol via the -oMr option above. If we have come
5101 via inetd, the process info has already been set up. We don't set
5102 received_protocol here for smtp input, as it varies according to
5103 batch/HELO/EHLO/AUTH/TLS. */
5107 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5108 smtp_batched_input? "batched " : "",
5109 (sender_address!= NULL)? sender_address : originator_login);
5113 if (received_protocol == NULL)
5114 received_protocol = string_sprintf("local%s", called_as);
5115 set_process_info("accepting a local non-SMTP message from <%s>",
5119 /* Initialize the session_local_queue-only flag (this will be ignored if
5120 mua_wrapper is set) */
5123 session_local_queue_only = queue_only;
5125 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5126 the spool if so configured. On failure, we must not attempt to send an error
5127 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5128 error code is given.) */
5130 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5132 fprintf(stderr, "exim: insufficient disk space\n");
5133 return EXIT_FAILURE;
5136 /* If this is smtp input of any kind, real or batched, handle the start of the
5139 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5140 because a log line has already been written for all its failure exists
5141 (usually "connection refused: <reason>") and writing another one is
5142 unnecessary clutter. */
5148 if (verify_check_host(&hosts_connection_nolog) == OK)
5149 log_write_selector &= ~L_smtp_connection;
5150 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5151 if (!smtp_start_session())
5154 exim_exit(EXIT_SUCCESS);
5158 /* Otherwise, set up the input size limit here. */
5162 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5163 if (expand_string_message != NULL)
5165 if (thismessage_size_limit == -1)
5166 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5167 "message_size_limit: %s", expand_string_message);
5169 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5170 "message_size_limit: %s", expand_string_message);
5174 /* Loop for several messages when reading SMTP input. If we fork any child
5175 processes, we don't want to wait for them unless synchronous delivery is
5176 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5177 same as SIG_DFL, despite the fact that documentation often lists the default as
5178 "ignore". This is a confusing area. This is what I know:
5180 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5181 processes that complete simply to go away without ever becoming defunct. You
5182 can't then wait for them - but we don't want to wait for them in the
5183 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5184 happen for all OS (e.g. *BSD is different).
5186 But that's not the end of the story. Some (many? all?) systems have the
5187 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5188 has by default, so it seems that the difference is merely one of default
5189 (compare restarting vs non-restarting signals).
5191 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5192 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5193 of the loop below. Paranoia rules.
5195 February 2003: That's *still* not the end of the story. There are now versions
5196 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5197 process then calls waitpid(), a grumble is written to the system log, because
5198 this is logically inconsistent. In other words, it doesn't like the paranoia.
5199 As a consequenc of this, the waitpid() below is now excluded if we are sure
5200 that SIG_IGN works. */
5202 if (!synchronous_delivery)
5205 struct sigaction act;
5206 act.sa_handler = SIG_IGN;
5207 sigemptyset(&(act.sa_mask));
5208 act.sa_flags = SA_NOCLDWAIT;
5209 sigaction(SIGCHLD, &act, NULL);
5211 signal(SIGCHLD, SIG_IGN);
5215 /* Save the current store pool point, for resetting at the start of
5216 each message, and save the real sender address, if any. */
5218 reset_point = store_get(0);
5219 real_sender_address = sender_address;
5221 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5222 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5227 store_reset(reset_point);
5230 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5231 input and build the recipients list, before calling receive_msg() to read the
5232 message proper. Whatever sender address is given in the SMTP transaction is
5233 often ignored for local senders - we use the actual sender, which is normally
5234 either the underlying user running this process or a -f argument provided by
5235 a trusted caller. It is saved in real_sender_address. The test for whether to
5236 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5241 if ((rc = smtp_setup_msg()) > 0)
5243 if (real_sender_address != NULL &&
5244 !receive_check_set_sender(sender_address))
5246 sender_address = raw_sender = real_sender_address;
5247 sender_address_unrewritten = NULL;
5250 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5251 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5252 the very end. The result of the ACL is ignored (as for other non-SMTP
5253 messages). It is run for its potential side effects. */
5255 if (smtp_batched_input && acl_not_smtp_start != NULL)
5257 uschar *user_msg, *log_msg;
5258 enable_dollar_recipients = TRUE;
5259 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5260 &user_msg, &log_msg);
5261 enable_dollar_recipients = FALSE;
5264 /* Now get the data for the message */
5266 more = receive_msg(extract_recipients);
5267 if (message_id[0] == 0)
5270 smtp_log_no_mail(); /* Log no mail if configured */
5271 exim_exit(EXIT_FAILURE);
5276 smtp_log_no_mail(); /* Log no mail if configured */
5277 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5281 /* In the non-SMTP case, we have all the information from the command
5282 line, but must process it in case it is in the more general RFC822
5283 format, and in any case, to detect syntax errors. Also, it appears that
5284 the use of comma-separated lists as single arguments is common, so we
5285 had better support them. */
5291 int count = argc - recipients_arg;
5292 uschar **list = argv + recipients_arg;
5294 /* These options cannot be changed dynamically for non-SMTP messages */
5296 active_local_sender_retain = local_sender_retain;
5297 active_local_from_check = local_from_check;
5299 /* Save before any rewriting */
5301 raw_sender = string_copy(sender_address);
5303 /* Loop for each argument */
5305 for (i = 0; i < count; i++)
5307 int start, end, domain;
5309 uschar *s = list[i];
5311 /* Loop for each comma-separated address */
5315 BOOL finished = FALSE;
5317 uschar *ss = parse_find_address_end(s, FALSE);
5319 if (*ss == ',') *ss = 0; else finished = TRUE;
5321 /* Check max recipients - if -t was used, these aren't recipients */
5323 if (recipients_max > 0 && ++rcount > recipients_max &&
5324 !extract_recipients)
5326 if (error_handling == ERRORS_STDERR)
5328 fprintf(stderr, "exim: too many recipients\n");
5329 exim_exit(EXIT_FAILURE);
5334 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5335 errors_sender_rc : EXIT_FAILURE;
5340 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5342 if (domain == 0 && !allow_unqualified_recipient)
5345 errmess = US"unqualified recipient address not allowed";
5348 if (recipient == NULL)
5350 if (error_handling == ERRORS_STDERR)
5352 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5353 string_printing(list[i]), errmess);
5354 exim_exit(EXIT_FAILURE);
5360 eblock.text1 = string_printing(list[i]);
5361 eblock.text2 = errmess;
5363 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5364 errors_sender_rc : EXIT_FAILURE;
5368 receive_add_recipient(recipient, -1);
5371 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5375 /* Show the recipients when debugging */
5380 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5381 if (recipients_list != NULL)
5383 debug_printf("Recipients:\n");
5384 for (i = 0; i < recipients_count; i++)
5385 debug_printf(" %s\n", recipients_list[i].address);
5389 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5390 ignored; rejecting here would just add complication, and it can just as
5391 well be done later. Allow $recipients to be visible in the ACL. */
5393 if (acl_not_smtp_start != NULL)
5395 uschar *user_msg, *log_msg;
5396 enable_dollar_recipients = TRUE;
5397 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5398 &user_msg, &log_msg);
5399 enable_dollar_recipients = FALSE;
5402 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5403 will just read the headers for the message, and not write anything onto the
5406 message_ended = END_NOTENDED;
5407 more = receive_msg(extract_recipients);
5409 /* more is always FALSE here (not SMTP message) when reading a message
5410 for real; when reading the headers of a message for filter testing,
5411 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5413 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5414 } /* Non-SMTP message reception */
5416 /* If this is a filter testing run, there are headers in store, but
5417 no message on the spool. Run the filtering code in testing mode, setting
5418 the domain to the qualify domain and the local part to the current user,
5419 unless they have been set by options. The prefix and suffix are left unset
5420 unless specified. The the return path is set to to the sender unless it has
5421 already been set from a return-path header in the message. */
5423 if (filter_test != FTEST_NONE)
5425 deliver_domain = (ftest_domain != NULL)?
5426 ftest_domain : qualify_domain_recipient;
5427 deliver_domain_orig = deliver_domain;
5428 deliver_localpart = (ftest_localpart != NULL)?
5429 ftest_localpart : originator_login;
5430 deliver_localpart_orig = deliver_localpart;
5431 deliver_localpart_prefix = ftest_prefix;
5432 deliver_localpart_suffix = ftest_suffix;
5433 deliver_home = originator_home;
5435 if (return_path == NULL)
5437 printf("Return-path copied from sender\n");
5438 return_path = string_copy(sender_address);
5442 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5444 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5446 receive_add_recipient(
5447 string_sprintf("%s%s%s@%s",
5448 (ftest_prefix == NULL)? US"" : ftest_prefix,
5450 (ftest_suffix == NULL)? US"" : ftest_suffix,
5451 deliver_domain), -1);
5453 printf("Recipient = %s\n", recipients_list[0].address);
5454 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5455 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5457 if (chdir("/")) /* Get away from wherever the user is running this from */
5459 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5460 exim_exit(EXIT_FAILURE);
5463 /* Now we run either a system filter test, or a user filter test, or both.
5464 In the latter case, headers added by the system filter will persist and be
5465 available to the user filter. We need to copy the filter variables
5468 if ((filter_test & FTEST_SYSTEM) != 0)
5470 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5471 exim_exit(EXIT_FAILURE);
5474 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5476 if ((filter_test & FTEST_USER) != 0)
5478 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5479 exim_exit(EXIT_FAILURE);
5482 exim_exit(EXIT_SUCCESS);
5485 /* Else act on the result of message reception. We should not get here unless
5486 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5487 will be TRUE. If it is not, check on the number of messages received in this
5490 if (!session_local_queue_only &&
5491 smtp_accept_queue_per_connection > 0 &&
5492 receive_messagecount > smtp_accept_queue_per_connection)
5494 session_local_queue_only = TRUE;
5495 queue_only_reason = 2;
5498 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5499 and queue_only_load is set, check that the load average is below it. If it is
5500 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5501 default), we put the whole session into queue_only mode. It then remains this
5502 way for any subsequent messages on the same SMTP connection. This is a
5503 deliberate choice; even though the load average may fall, it doesn't seem
5504 right to deliver later messages on the same call when not delivering earlier
5505 ones. However, there are odd cases where this is not wanted, so this can be
5506 changed by setting queue_only_load_latch false. */
5508 local_queue_only = session_local_queue_only;
5509 if (!local_queue_only && queue_only_load >= 0)
5511 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5512 if (local_queue_only)
5514 queue_only_reason = 3;
5515 if (queue_only_load_latch) session_local_queue_only = TRUE;
5519 /* If running as an MUA wrapper, all queueing options and freezing options
5523 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5525 /* Log the queueing here, when it will get a message id attached, but
5526 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5529 if (local_queue_only) switch(queue_only_reason)
5532 log_write(L_delay_delivery,
5533 LOG_MAIN, "no immediate delivery: more than %d messages "
5534 "received in one connection", smtp_accept_queue_per_connection);
5538 log_write(L_delay_delivery,
5539 LOG_MAIN, "no immediate delivery: load average %.2f",
5540 (double)load_average/1000.0);
5544 /* Else do the delivery unless the ACL or local_scan() called for queue only
5545 or froze the message. Always deliver in a separate process. A fork failure is
5546 not a disaster, as the delivery will eventually happen on a subsequent queue
5547 run. The search cache must be tidied before the fork, as the parent will
5548 do it before exiting. The child will trigger a lookup failure and
5549 thereby defer the delivery if it tries to use (for example) a cached ldap
5550 connection that the parent has called unbind on. */
5552 else if (!queue_only_policy && !deliver_freeze)
5557 if ((pid = fork()) == 0)
5560 close_unwanted(); /* Close unwanted file descriptors and TLS */
5561 exim_nullstd(); /* Ensure std{in,out,err} exist */
5563 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5564 mode, deliver_drop_privilege is forced TRUE). */
5566 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5568 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5570 /* Control does not return here. */
5573 /* No need to re-exec */
5575 rc = deliver_message(message_id, FALSE, FALSE);
5577 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5578 EXIT_SUCCESS : EXIT_FAILURE);
5583 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5584 "process: %s", strerror(errno));
5587 /* In the parent, wait if synchronous delivery is required. This will
5588 always be the case in MUA wrapper mode. */
5590 else if (synchronous_delivery)
5593 while (wait(&status) != pid);
5594 if ((status & 0x00ff) != 0)
5595 log_write(0, LOG_MAIN|LOG_PANIC,
5596 "process %d crashed with signal %d while delivering %s",
5597 (int)pid, status & 0x00ff, message_id);
5598 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5602 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5603 automatically reaps children (see comments above the loop), clear away any
5604 finished subprocesses here, in case there are lots of messages coming in
5605 from the same source. */
5607 #ifndef SIG_IGN_WORKS
5608 while (waitpid(-1, NULL, WNOHANG) > 0);
5612 exim_exit(EXIT_SUCCESS); /* Never returns */
5613 return 0; /* To stop compiler warning */