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 We assume it to be not worth sleeping for under 100us; this value will
271 require revisiting as hardware advances. This avoids the issue of
272 a zero-valued timer setting meaning "never fire".
274 Argument: an itimerval structure containing the interval
279 milliwait(struct itimerval *itval)
282 sigset_t old_sigmask;
284 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
286 (void)sigemptyset(&sigmask); /* Empty mask */
287 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
288 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
289 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
290 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
291 "setitimer() failed: %s", strerror(errno));
292 (void)sigfillset(&sigmask); /* All signals */
293 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
294 (void)sigsuspend(&sigmask); /* Until SIGALRM */
295 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
301 /*************************************************
302 * Millisecond sleep function *
303 *************************************************/
305 /* The basic sleep() function has a granularity of 1 second, which is too rough
306 in some cases - for example, when using an increasing delay to slow down
309 Argument: number of millseconds
316 struct itimerval itval;
317 itval.it_interval.tv_sec = 0;
318 itval.it_interval.tv_usec = 0;
319 itval.it_value.tv_sec = msec/1000;
320 itval.it_value.tv_usec = (msec % 1000) * 1000;
326 /*************************************************
327 * Compare microsecond times *
328 *************************************************/
335 Returns: -1, 0, or +1
339 exim_tvcmp(struct timeval *t1, struct timeval *t2)
341 if (t1->tv_sec > t2->tv_sec) return +1;
342 if (t1->tv_sec < t2->tv_sec) return -1;
343 if (t1->tv_usec > t2->tv_usec) return +1;
344 if (t1->tv_usec < t2->tv_usec) return -1;
351 /*************************************************
352 * Clock tick wait function *
353 *************************************************/
355 /* Exim uses a time + a pid to generate a unique identifier in two places: its
356 message IDs, and in file names for maildir deliveries. Because some OS now
357 re-use pids within the same second, sub-second times are now being used.
358 However, for absolute certaintly, we must ensure the clock has ticked before
359 allowing the relevant process to complete. At the time of implementation of
360 this code (February 2003), the speed of processors is such that the clock will
361 invariably have ticked already by the time a process has done its job. This
362 function prepares for the time when things are faster - and it also copes with
363 clocks that go backwards.
366 then_tv A timeval which was used to create uniqueness; its usec field
367 has been rounded down to the value of the resolution.
368 We want to be sure the current time is greater than this.
369 resolution The resolution that was used to divide the microseconds
370 (1 for maildir, larger for message ids)
376 exim_wait_tick(struct timeval *then_tv, int resolution)
378 struct timeval now_tv;
379 long int now_true_usec;
381 (void)gettimeofday(&now_tv, NULL);
382 now_true_usec = now_tv.tv_usec;
383 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
385 if (exim_tvcmp(&now_tv, then_tv) <= 0)
387 struct itimerval itval;
388 itval.it_interval.tv_sec = 0;
389 itval.it_interval.tv_usec = 0;
390 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
391 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
393 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
394 negative value for the microseconds is possible only in the case when "now"
395 is more than a second less than "then". That means that itval.it_value.tv_sec
396 is greater than zero. The following correction is therefore safe. */
398 if (itval.it_value.tv_usec < 0)
400 itval.it_value.tv_usec += 1000000;
401 itval.it_value.tv_sec -= 1;
404 DEBUG(D_transport|D_receive)
406 if (!running_in_test_harness)
408 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
409 then_tv->tv_sec, (long) then_tv->tv_usec,
410 now_tv.tv_sec, (long) now_tv.tv_usec);
411 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
412 (long) itval.it_value.tv_usec);
423 /*************************************************
424 * Call fopen() with umask 777 and adjust mode *
425 *************************************************/
427 /* Exim runs with umask(0) so that files created with open() have the mode that
428 is specified in the open() call. However, there are some files, typically in
429 the spool directory, that are created with fopen(). They end up world-writeable
430 if no precautions are taken. Although the spool directory is not accessible to
431 the world, this is an untidiness. So this is a wrapper function for fopen()
432 that sorts out the mode of the created file.
435 filename the file name
436 options the fopen() options
437 mode the required mode
439 Returns: the fopened FILE or NULL
443 modefopen(const uschar *filename, const char *options, mode_t mode)
445 mode_t saved_umask = umask(0777);
446 FILE *f = Ufopen(filename, options);
447 (void)umask(saved_umask);
448 if (f != NULL) (void)fchmod(fileno(f), mode);
455 /*************************************************
456 * Ensure stdin, stdout, and stderr exist *
457 *************************************************/
459 /* Some operating systems grumble if an exec() happens without a standard
460 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
461 file will be opened and will use these fd values, and then some other bit of
462 code will assume, for example, that it can write error messages to stderr.
463 This function ensures that fds 0, 1, and 2 are open if they do not already
464 exist, by connecting them to /dev/null.
466 This function is also used to ensure that std{in,out,err} exist at all times,
467 so that if any library that Exim calls tries to use them, it doesn't crash.
479 for (i = 0; i <= 2; i++)
481 if (fstat(i, &statbuf) < 0 && errno == EBADF)
483 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
484 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
485 string_open_failed(errno, "/dev/null"));
486 if (devnull != i) (void)dup2(devnull, i);
489 if (devnull > 2) (void)close(devnull);
495 /*************************************************
496 * Close unwanted file descriptors for delivery *
497 *************************************************/
499 /* This function is called from a new process that has been forked to deliver
500 an incoming message, either directly, or using exec.
502 We want any smtp input streams to be closed in this new process. However, it
503 has been observed that using fclose() here causes trouble. When reading in -bS
504 input, duplicate copies of messages have been seen. The files will be sharing a
505 file pointer with the parent process, and it seems that fclose() (at least on
506 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
507 least sometimes. Hence we go for closing the underlying file descriptors.
509 If TLS is active, we want to shut down the TLS library, but without molesting
510 the parent's SSL connection.
512 For delivery of a non-SMTP message, we want to close stdin and stdout (and
513 stderr unless debugging) because the calling process might have set them up as
514 pipes and be waiting for them to close before it waits for the submission
515 process to terminate. If they aren't closed, they hold up the calling process
516 until the initial delivery process finishes, which is not what we want.
518 Exception: We do want it for synchronous delivery!
520 And notwithstanding all the above, if D_resolver is set, implying resolver
521 debugging, leave stdout open, because that's where the resolver writes its
524 When we close stderr (which implies we've also closed stdout), we also get rid
525 of any controlling terminal.
537 tls_close(TRUE, FALSE); /* Shut down the TLS library */
539 (void)close(fileno(smtp_in));
540 (void)close(fileno(smtp_out));
545 (void)close(0); /* stdin */
546 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
547 if (debug_selector == 0) /* stderr */
549 if (!synchronous_delivery)
562 /*************************************************
564 *************************************************/
566 /* This function sets a new uid and gid permanently, optionally calling
567 initgroups() to set auxiliary groups. There are some special cases when running
568 Exim in unprivileged modes. In these situations the effective uid will not be
569 root; if we already have the right effective uid/gid, and don't need to
570 initialize any groups, leave things as they are.
575 igflag TRUE if initgroups() wanted
576 msg text to use in debugging output and failure log
578 Returns: nothing; bombs out on failure
582 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
584 uid_t euid = geteuid();
585 gid_t egid = getegid();
587 if (euid == root_uid || euid != uid || egid != gid || igflag)
589 /* At least one OS returns +1 for initgroups failure, so just check for
594 struct passwd *pw = getpwuid(uid);
597 if (initgroups(pw->pw_name, gid) != 0)
598 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
599 (long int)uid, strerror(errno));
601 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
602 "no passwd entry for uid=%ld", (long int)uid);
605 if (setgid(gid) < 0 || setuid(uid) < 0)
607 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
608 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
612 /* Debugging output included uid/gid and all groups */
616 int group_count, save_errno;
617 gid_t group_list[NGROUPS_MAX];
618 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
619 (long int)geteuid(), (long int)getegid(), (long int)getpid());
620 group_count = getgroups(NGROUPS_MAX, group_list);
622 debug_printf(" auxiliary group list:");
626 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
628 else if (group_count < 0)
629 debug_printf(" <error: %s>", strerror(save_errno));
630 else debug_printf(" <none>");
638 /*************************************************
640 *************************************************/
642 /* Exim exits via this function so that it always clears up any open
648 Returns: does not return
656 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
657 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
664 /*************************************************
665 * Extract port from host address *
666 *************************************************/
668 /* Called to extract the port from the values given to -oMa and -oMi.
669 It also checks the syntax of the address, and terminates it before the
670 port data when a port is extracted.
673 address the address, with possible port on the end
675 Returns: the port, or zero if there isn't one
676 bombs out on a syntax error
680 check_port(uschar *address)
682 int port = host_address_extract_port(address);
683 if (string_is_ip_address(address, NULL) == 0)
685 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
693 /*************************************************
694 * Test/verify an address *
695 *************************************************/
697 /* This function is called by the -bv and -bt code. It extracts a working
698 address from a full RFC 822 address. This isn't really necessary per se, but it
699 has the effect of collapsing source routes.
703 flags flag bits for verify_address()
704 exit_value to be set for failures
710 test_address(uschar *s, int flags, int *exit_value)
712 int start, end, domain;
713 uschar *parse_error = NULL;
714 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
718 fprintf(stdout, "syntax error: %s\n", parse_error);
723 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
724 -1, -1, NULL, NULL, NULL);
725 if (rc == FAIL) *exit_value = 2;
726 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
732 /*************************************************
733 * Show supported features *
734 *************************************************/
736 /* This function is called for -bV/--version and for -d to output the optional
737 features of the current Exim binary.
739 Arguments: a FILE for printing
744 show_whats_supported(FILE *f)
748 #ifdef DB_VERSION_STRING
749 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
750 #elif defined(BTREEVERSION) && defined(HASHVERSION)
752 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
754 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
756 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
757 fprintf(f, "Probably ndbm\n");
758 #elif defined(USE_TDB)
759 fprintf(f, "Using tdb\n");
762 fprintf(f, "Probably GDBM (native mode)\n");
764 fprintf(f, "Probably GDBM (compatibility mode)\n");
768 fprintf(f, "Support for:");
769 #ifdef SUPPORT_CRYPTEQ
770 fprintf(f, " crypteq");
773 fprintf(f, " iconv()");
778 #ifdef HAVE_SETCLASSRESOURCES
779 fprintf(f, " use_setclassresources");
788 fprintf(f, " Expand_dlfunc");
790 #ifdef USE_TCP_WRAPPERS
791 fprintf(f, " TCPwrappers");
795 fprintf(f, " GnuTLS");
797 fprintf(f, " OpenSSL");
800 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
801 fprintf(f, " translate_ip_address");
803 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
804 fprintf(f, " move_frozen_messages");
806 #ifdef WITH_CONTENT_SCAN
807 fprintf(f, " Content_Scanning");
812 #ifdef WITH_OLD_DEMIME
813 fprintf(f, " Old_Demime");
821 #ifdef EXPERIMENTAL_SPF
822 fprintf(f, " Experimental_SPF");
824 #ifdef EXPERIMENTAL_SRS
825 fprintf(f, " Experimental_SRS");
827 #ifdef EXPERIMENTAL_BRIGHTMAIL
828 fprintf(f, " Experimental_Brightmail");
830 #ifdef EXPERIMENTAL_DCC
831 fprintf(f, " Experimental_DCC");
833 #ifdef EXPERIMENTAL_DMARC
834 fprintf(f, " Experimental_DMARC");
836 #ifdef EXPERIMENTAL_PROXY
837 fprintf(f, " Experimental_Proxy");
839 #ifdef EXPERIMENTAL_TPDA
840 fprintf(f, " Experimental_TPDA");
842 #ifdef EXPERIMENTAL_REDIS
843 fprintf(f, " Experimental_Redis");
845 #ifdef EXPERIMENTAL_CERTNAMES
846 fprintf(f, " Experimental_Certnames");
848 #ifdef EXPERIMENTAL_DSN
849 fprintf(f, " Experimental_DSN");
853 fprintf(f, "Lookups (built-in):");
854 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
855 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
857 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
860 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
861 fprintf(f, " dbm dbmjz dbmnz");
863 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
864 fprintf(f, " dnsdb");
866 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
867 fprintf(f, " dsearch");
869 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
870 fprintf(f, " ibase");
872 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
873 fprintf(f, " ldap ldapdn ldapm");
875 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
876 fprintf(f, " mysql");
878 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
879 fprintf(f, " nis nis0");
881 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
882 fprintf(f, " nisplus");
884 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
885 fprintf(f, " oracle");
887 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
888 fprintf(f, " passwd");
890 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
891 fprintf(f, " pgsql");
893 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
894 fprintf(f, " sqlite");
896 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
897 fprintf(f, " testdb");
899 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
900 fprintf(f, " whoson");
904 fprintf(f, "Authenticators:");
906 fprintf(f, " cram_md5");
908 #ifdef AUTH_CYRUS_SASL
909 fprintf(f, " cyrus_sasl");
912 fprintf(f, " dovecot");
915 fprintf(f, " gsasl");
917 #ifdef AUTH_HEIMDAL_GSSAPI
918 fprintf(f, " heimdal_gssapi");
920 #ifdef AUTH_PLAINTEXT
921 fprintf(f, " plaintext");
928 fprintf(f, "Routers:");
930 fprintf(f, " accept");
932 #ifdef ROUTER_DNSLOOKUP
933 fprintf(f, " dnslookup");
935 #ifdef ROUTER_IPLITERAL
936 fprintf(f, " ipliteral");
938 #ifdef ROUTER_IPLOOKUP
939 fprintf(f, " iplookup");
941 #ifdef ROUTER_MANUALROUTE
942 fprintf(f, " manualroute");
944 #ifdef ROUTER_QUERYPROGRAM
945 fprintf(f, " queryprogram");
947 #ifdef ROUTER_REDIRECT
948 fprintf(f, " redirect");
952 fprintf(f, "Transports:");
953 #ifdef TRANSPORT_APPENDFILE
954 fprintf(f, " appendfile");
955 #ifdef SUPPORT_MAILDIR
956 fprintf(f, "/maildir");
958 #ifdef SUPPORT_MAILSTORE
959 fprintf(f, "/mailstore");
965 #ifdef TRANSPORT_AUTOREPLY
966 fprintf(f, " autoreply");
968 #ifdef TRANSPORT_LMTP
971 #ifdef TRANSPORT_PIPE
974 #ifdef TRANSPORT_SMTP
979 if (fixed_never_users[0] > 0)
982 fprintf(f, "Fixed never_users: ");
983 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
984 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
985 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
988 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
990 /* Everything else is details which are only worth reporting when debugging.
991 Perhaps the tls_version_report should move into this too. */
996 /* clang defines __GNUC__ (at least, for me) so test for it first */
997 #if defined(__clang__)
998 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
999 #elif defined(__GNUC__)
1000 fprintf(f, "Compiler: GCC [%s]\n",
1004 "? unknown version ?"
1008 fprintf(f, "Compiler: <unknown>\n");
1012 tls_version_report(f);
1015 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1016 if (authi->version_report) {
1017 (*authi->version_report)(f);
1021 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1022 characters; unless it's an ancient version of PCRE in which case it
1024 #ifndef PCRE_PRERELEASE
1025 #define PCRE_PRERELEASE
1028 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1029 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1031 PCRE_MAJOR, PCRE_MINOR,
1032 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1035 #undef EXPAND_AND_QUOTE
1038 for (i = 0; i < lookup_list_count; i++)
1040 if (lookup_list[i]->version_report)
1041 lookup_list[i]->version_report(f);
1044 #ifdef WHITELIST_D_MACROS
1045 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1047 fprintf(f, "WHITELIST_D_MACROS unset\n");
1049 #ifdef TRUSTED_CONFIG_LIST
1050 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1052 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1059 /*************************************************
1060 * Show auxiliary information about Exim *
1061 *************************************************/
1064 show_exim_information(enum commandline_info request, FILE *stream)
1071 fprintf(stream, "Oops, something went wrong.\n");
1075 "The -bI: flag takes a string indicating which information to provide.\n"
1076 "If the string is not recognised, you'll get this help (on stderr).\n"
1078 " exim -bI:help this information\n"
1079 " exim -bI:dscp dscp value keywords known\n"
1080 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1084 for (pp = exim_sieve_extension_list; *pp; ++pp)
1085 fprintf(stream, "%s\n", *pp);
1088 dscp_list_to_stream(stream);
1094 /*************************************************
1095 * Quote a local part *
1096 *************************************************/
1098 /* This function is used when a sender address or a From: or Sender: header
1099 line is being created from the caller's login, or from an authenticated_id. It
1100 applies appropriate quoting rules for a local part.
1102 Argument: the local part
1103 Returns: the local part, quoted if necessary
1107 local_part_quote(uschar *lpart)
1109 BOOL needs_quote = FALSE;
1114 for (t = lpart; !needs_quote && *t != 0; t++)
1116 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1117 (*t != '.' || t == lpart || t[1] == 0);
1120 if (!needs_quote) return lpart;
1123 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1127 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1130 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1133 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1134 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1135 yield = string_cat(yield, &size, &ptr, nq, 1);
1139 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1147 /*************************************************
1148 * Load readline() functions *
1149 *************************************************/
1151 /* This function is called from testing executions that read data from stdin,
1152 but only when running as the calling user. Currently, only -be does this. The
1153 function loads the readline() function library and passes back the functions.
1154 On some systems, it needs the curses library, so load that too, but try without
1155 it if loading fails. All this functionality has to be requested at build time.
1158 fn_readline_ptr pointer to where to put the readline pointer
1159 fn_addhist_ptr pointer to where to put the addhistory function
1161 Returns: the dlopen handle or NULL on failure
1165 set_readline(char * (**fn_readline_ptr)(const char *),
1166 void (**fn_addhist_ptr)(const char *))
1169 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1171 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1172 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1174 if (dlhandle != NULL)
1176 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1177 * char * readline (const char *prompt);
1178 * void add_history (const char *string);
1180 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1181 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1185 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1194 /*************************************************
1195 * Get a line from stdin for testing things *
1196 *************************************************/
1198 /* This function is called when running tests that can take a number of lines
1199 of input (for example, -be and -bt). It handles continuations and trailing
1200 spaces. And prompting and a blank line output on eof. If readline() is in use,
1201 the arguments are non-NULL and provide the relevant functions.
1204 fn_readline readline function or NULL
1205 fn_addhist addhist function or NULL
1207 Returns: pointer to dynamic memory, or NULL at end of file
1211 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1216 uschar *yield = NULL;
1218 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1222 uschar buffer[1024];
1226 char *readline_line = NULL;
1227 if (fn_readline != NULL)
1229 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1230 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1231 p = US readline_line;
1236 /* readline() not in use */
1239 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1243 /* Handle the line */
1245 ss = p + (int)Ustrlen(p);
1246 while (ss > p && isspace(ss[-1])) ss--;
1250 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1253 yield = string_cat(yield, &size, &ptr, p, ss - p);
1256 if (fn_readline != NULL) free(readline_line);
1259 if (ss == p || yield[ptr-1] != '\\')
1267 if (yield == NULL) printf("\n");
1273 /*************************************************
1274 * Output usage information for the program *
1275 *************************************************/
1277 /* This function is called when there are no recipients
1278 or a specific --help argument was added.
1281 progname information on what name we were called by
1283 Returns: DOES NOT RETURN
1287 exim_usage(uschar *progname)
1290 /* Handle specific program invocation varients */
1291 if (Ustrcmp(progname, US"-mailq") == 0)
1294 "mailq - list the contents of the mail queue\n\n"
1295 "For a list of options, see the Exim documentation.\n");
1299 /* Generic usage - we output this whatever happens */
1301 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1302 "not directly from a shell command line. Options and/or arguments control\n"
1303 "what it does when called. For a list of options, see the Exim documentation.\n");
1310 /*************************************************
1311 * Validate that the macros given are okay *
1312 *************************************************/
1314 /* Typically, Exim will drop privileges if macros are supplied. In some
1315 cases, we want to not do so.
1317 Arguments: none (macros is a global)
1318 Returns: true if trusted, false otherwise
1322 macros_trusted(void)
1324 #ifdef WHITELIST_D_MACROS
1326 uschar *whitelisted, *end, *p, **whites, **w;
1327 int white_count, i, n;
1329 BOOL prev_char_item, found;
1334 #ifndef WHITELIST_D_MACROS
1338 /* We only trust -D overrides for some invoking users:
1339 root, the exim run-time user, the optional config owner user.
1340 I don't know why config-owner would be needed, but since they can own the
1341 config files anyway, there's no security risk to letting them override -D. */
1342 if ( ! ((real_uid == root_uid)
1343 || (real_uid == exim_uid)
1344 #ifdef CONFIGURE_OWNER
1345 || (real_uid == config_uid)
1349 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1353 /* Get a list of macros which are whitelisted */
1354 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1355 prev_char_item = FALSE;
1357 for (p = whitelisted; *p != '\0'; ++p)
1359 if (*p == ':' || isspace(*p))
1364 prev_char_item = FALSE;
1367 if (!prev_char_item)
1368 prev_char_item = TRUE;
1375 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1376 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1381 if (i == white_count)
1383 while (*p != '\0' && p < end)
1389 /* The list of macros should be very short. Accept the N*M complexity. */
1390 for (m = macros; m != NULL; m = m->next)
1393 for (w = whites; *w; ++w)
1394 if (Ustrcmp(*w, m->name) == 0)
1401 if (m->replacement == NULL)
1403 len = Ustrlen(m->replacement);
1406 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1407 0, PCRE_EOPT, NULL, 0);
1410 if (n != PCRE_ERROR_NOMATCH)
1411 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1415 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1421 /*************************************************
1422 * Entry point and high-level code *
1423 *************************************************/
1425 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1426 the appropriate action. All the necessary functions are present in the one
1427 binary. I originally thought one should split it up, but it turns out that so
1428 much of the apparatus is needed in each chunk that one might as well just have
1429 it all available all the time, which then makes the coding easier as well.
1432 argc count of entries in argv
1433 argv argument strings, with argv[0] being the program name
1435 Returns: EXIT_SUCCESS if terminated successfully
1436 EXIT_FAILURE otherwise, except when a message has been sent
1437 to the sender, and -oee was given
1441 main(int argc, char **cargv)
1443 uschar **argv = USS cargv;
1444 int arg_receive_timeout = -1;
1445 int arg_smtp_receive_timeout = -1;
1446 int arg_error_handling = error_handling;
1447 int filter_sfd = -1;
1448 int filter_ufd = -1;
1451 int list_queue_option = 0;
1453 int msg_action_arg = -1;
1454 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1455 int queue_only_reason = 0;
1457 int perl_start_option = 0;
1459 int recipients_arg = argc;
1460 int sender_address_domain = 0;
1461 int test_retry_arg = -1;
1462 int test_rewrite_arg = -1;
1463 BOOL arg_queue_only = FALSE;
1464 BOOL bi_option = FALSE;
1465 BOOL checking = FALSE;
1466 BOOL count_queue = FALSE;
1467 BOOL expansion_test = FALSE;
1468 BOOL extract_recipients = FALSE;
1469 BOOL flag_G = FALSE;
1470 BOOL flag_n = FALSE;
1471 BOOL forced_delivery = FALSE;
1472 BOOL f_end_dot = FALSE;
1473 BOOL deliver_give_up = FALSE;
1474 BOOL list_queue = FALSE;
1475 BOOL list_options = FALSE;
1476 BOOL local_queue_only;
1478 BOOL one_msg_action = FALSE;
1479 BOOL queue_only_set = FALSE;
1480 BOOL receiving_message = TRUE;
1481 BOOL sender_ident_set = FALSE;
1482 BOOL session_local_queue_only;
1484 BOOL removed_privilege = FALSE;
1485 BOOL usage_wanted = FALSE;
1486 BOOL verify_address_mode = FALSE;
1487 BOOL verify_as_sender = FALSE;
1488 BOOL version_printed = FALSE;
1489 uschar *alias_arg = NULL;
1490 uschar *called_as = US"";
1491 uschar *cmdline_syslog_name = NULL;
1492 uschar *start_queue_run_id = NULL;
1493 uschar *stop_queue_run_id = NULL;
1494 uschar *expansion_test_message = NULL;
1495 uschar *ftest_domain = NULL;
1496 uschar *ftest_localpart = NULL;
1497 uschar *ftest_prefix = NULL;
1498 uschar *ftest_suffix = NULL;
1499 uschar *malware_test_file = NULL;
1500 uschar *real_sender_address;
1501 uschar *originator_home = US"/";
1506 struct stat statbuf;
1507 pid_t passed_qr_pid = (pid_t)0;
1508 int passed_qr_pipe = -1;
1509 gid_t group_list[NGROUPS_MAX];
1511 /* For the -bI: flag */
1512 enum commandline_info info_flag = CMDINFO_NONE;
1513 BOOL info_stdout = FALSE;
1515 /* Possible options for -R and -S */
1517 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1519 /* Need to define this in case we need to change the environment in order
1520 to get rid of a bogus time zone. We have to make it char rather than uschar
1521 because some OS define it in /usr/include/unistd.h. */
1523 extern char **environ;
1525 /* If the Exim user and/or group and/or the configuration file owner/group were
1526 defined by ref:name at build time, we must now find the actual uid/gid values.
1527 This is a feature to make the lives of binary distributors easier. */
1529 #ifdef EXIM_USERNAME
1530 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1534 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1538 /* If ref:name uses a number as the name, route_finduser() returns
1539 TRUE with exim_uid set and pw coerced to NULL. */
1541 exim_gid = pw->pw_gid;
1542 #ifndef EXIM_GROUPNAME
1546 "exim: ref:name should specify a usercode, not a group.\n"
1547 "exim: can't let you get away with it unless you also specify a group.\n");
1554 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1560 #ifdef EXIM_GROUPNAME
1561 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1563 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1569 #ifdef CONFIGURE_OWNERNAME
1570 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1572 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1573 CONFIGURE_OWNERNAME);
1578 /* We default the system_filter_user to be the Exim run-time user, as a
1579 sane non-root value. */
1580 system_filter_uid = exim_uid;
1582 #ifdef CONFIGURE_GROUPNAME
1583 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1585 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1586 CONFIGURE_GROUPNAME);
1591 /* In the Cygwin environment, some initialization needs doing. It is fudged
1592 in by means of this macro. */
1598 /* Check a field which is patched when we are running Exim within its
1599 testing harness; do a fast initial check, and then the whole thing. */
1601 running_in_test_harness =
1602 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1604 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1605 at the start of a program; however, it seems that some environments do not
1606 follow this. A "strange" locale can affect the formatting of timestamps, so we
1609 setlocale(LC_ALL, "C");
1611 /* Set up the default handler for timing using alarm(). */
1613 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1615 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1616 because store_malloc writes a log entry on failure. */
1618 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1619 if (log_buffer == NULL)
1621 fprintf(stderr, "exim: failed to get store for log buffer\n");
1625 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1626 NULL when the daemon is run and the file is closed. We have to use this
1627 indirection, because some systems don't allow writing to the variable "stderr".
1630 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1632 /* Arrange for the PCRE regex library to use our store functions. Note that
1633 the normal calls are actually macros that add additional arguments for
1634 debugging purposes so we have to assign specially constructed functions here.
1635 The default is to use store in the stacking pool, but this is overridden in the
1636 regex_must_compile() function. */
1638 pcre_malloc = function_store_get;
1639 pcre_free = function_dummy_free;
1641 /* Ensure there is a big buffer for temporary use in several places. It is put
1642 in malloc store so that it can be freed for enlargement if necessary. */
1644 big_buffer = store_malloc(big_buffer_size);
1646 /* Set up the handler for the data request signal, and set the initial
1647 descriptive text. */
1649 set_process_info("initializing");
1650 os_restarting_signal(SIGUSR1, usr1_handler);
1652 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1653 in the daemon code. For the rest of Exim's uses, we ignore it. */
1655 signal(SIGHUP, SIG_IGN);
1657 /* We don't want to die on pipe errors as the code is written to handle
1658 the write error instead. */
1660 signal(SIGPIPE, SIG_IGN);
1662 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1663 set to SIG_IGN. This causes subprocesses that complete before the parent
1664 process waits for them not to hang around, so when Exim calls wait(), nothing
1665 is there. The wait() code has been made robust against this, but let's ensure
1666 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1667 ending status. We use sigaction rather than plain signal() on those OS where
1668 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1669 problem on AIX with this.) */
1673 struct sigaction act;
1674 act.sa_handler = SIG_DFL;
1675 sigemptyset(&(act.sa_mask));
1677 sigaction(SIGCHLD, &act, NULL);
1680 signal(SIGCHLD, SIG_DFL);
1683 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1688 /* Set up the version number. Set up the leading 'E' for the external form of
1689 message ids, set the pointer to the internal form, and initialize it to
1690 indicate no message being processed. */
1693 message_id_option[0] = '-';
1694 message_id_external = message_id_option + 1;
1695 message_id_external[0] = 'E';
1696 message_id = message_id_external + 1;
1699 /* Set the umask to zero so that any files Exim creates using open() are
1700 created with the modes that it specifies. NOTE: Files created with fopen() have
1701 a problem, which was not recognized till rather late (February 2006). With this
1702 umask, such files will be world writeable. (They are all content scanning files
1703 in the spool directory, which isn't world-accessible, so this is not a
1704 disaster, but it's untidy.) I don't want to change this overall setting,
1705 however, because it will interact badly with the open() calls. Instead, there's
1706 now a function called modefopen() that fiddles with the umask while calling
1711 /* Precompile the regular expression for matching a message id. Keep this in
1712 step with the code that generates ids in the accept.c module. We need to do
1713 this here, because the -M options check their arguments for syntactic validity
1714 using mac_ismsgid, which uses this. */
1717 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1719 /* Precompile the regular expression that is used for matching an SMTP error
1720 code, possibly extended, at the start of an error message. Note that the
1721 terminating whitespace character is included. */
1724 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1727 #ifdef WHITELIST_D_MACROS
1728 /* Precompile the regular expression used to filter the content of macros
1729 given to -D for permissibility. */
1731 regex_whitelisted_macro =
1732 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1736 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1737 this seems to be a generally accepted convention, since one finds symbolic
1738 links called "mailq" in standard OS configurations. */
1740 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1741 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1744 receiving_message = FALSE;
1745 called_as = US"-mailq";
1748 /* If the program is called as "rmail" treat it as equivalent to
1749 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1750 i.e. preventing a single dot on a line from terminating the message, and
1751 returning with zero return code, even in cases of error (provided an error
1752 message has been sent). */
1754 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1755 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1758 called_as = US"-rmail";
1759 errors_sender_rc = EXIT_SUCCESS;
1762 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1763 this is a smail convention. */
1765 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1766 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1768 smtp_input = smtp_batched_input = TRUE;
1769 called_as = US"-rsmtp";
1772 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1773 this is a smail convention. */
1775 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1776 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1779 receiving_message = FALSE;
1780 called_as = US"-runq";
1783 /* If the program is called as "newaliases" treat it as equivalent to
1784 "exim -bi"; this is a sendmail convention. */
1786 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1787 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1790 receiving_message = FALSE;
1791 called_as = US"-newaliases";
1794 /* Save the original effective uid for a couple of uses later. It should
1795 normally be root, but in some esoteric environments it may not be. */
1797 original_euid = geteuid();
1799 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1800 to be the same as the real ones. This makes a difference only if Exim is setuid
1801 (or setgid) to something other than root, which could be the case in some
1802 special configurations. */
1804 real_uid = getuid();
1805 real_gid = getgid();
1807 if (real_uid == root_uid)
1809 rv = setgid(real_gid);
1812 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1813 (long int)real_gid, strerror(errno));
1816 rv = setuid(real_uid);
1819 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1820 (long int)real_uid, strerror(errno));
1825 /* If neither the original real uid nor the original euid was root, Exim is
1826 running in an unprivileged state. */
1828 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1830 /* Scan the program's arguments. Some can be dealt with right away; others are
1831 simply recorded for checking and handling afterwards. Do a high-level switch
1832 on the second character (the one after '-'), to save some effort. */
1834 for (i = 1; i < argc; i++)
1836 BOOL badarg = FALSE;
1837 uschar *arg = argv[i];
1841 /* An argument not starting with '-' is the start of a recipients list;
1842 break out of the options-scanning loop. */
1850 /* An option consistion of -- terminates the options */
1852 if (Ustrcmp(arg, "--") == 0)
1854 recipients_arg = i + 1;
1858 /* Handle flagged options */
1860 switchchar = arg[1];
1863 /* Make all -ex options synonymous with -oex arguments, since that
1864 is assumed by various callers. Also make -qR options synonymous with -R
1865 options, as that seems to be required as well. Allow for -qqR too, and
1866 the same for -S options. */
1868 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1869 Ustrncmp(arg+1, "qR", 2) == 0 ||
1870 Ustrncmp(arg+1, "qS", 2) == 0)
1872 switchchar = arg[2];
1875 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1877 switchchar = arg[3];
1879 queue_2stage = TRUE;
1882 /* Make -r synonymous with -f, since it is a documented alias */
1884 else if (arg[1] == 'r') switchchar = 'f';
1886 /* Make -ov synonymous with -v */
1888 else if (Ustrcmp(arg, "-ov") == 0)
1894 /* deal with --option_aliases */
1895 else if (switchchar == '-')
1897 if (Ustrcmp(argrest, "help") == 0)
1899 usage_wanted = TRUE;
1902 else if (Ustrcmp(argrest, "version") == 0)
1909 /* High-level switch on active initial letter */
1914 /* sendmail uses -Ac and -Am to control which .cf file is used;
1917 if (*argrest == '\0') { badarg = TRUE; break; }
1920 BOOL ignore = FALSE;
1925 if (*(argrest + 1) == '\0')
1929 if (!ignore) { badarg = TRUE; break; }
1933 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1934 so has no need of it. */
1937 if (*argrest == 0) i++; /* Skip over the type */
1942 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1944 /* -bd: Run in daemon mode, awaiting SMTP connections.
1945 -bdf: Ditto, but in the foreground.
1948 if (*argrest == 'd')
1950 daemon_listen = TRUE;
1951 if (*(++argrest) == 'f') background_daemon = FALSE;
1952 else if (*argrest != 0) { badarg = TRUE; break; }
1955 /* -be: Run in expansion test mode
1956 -bem: Ditto, but read a message from a file first
1959 else if (*argrest == 'e')
1961 expansion_test = checking = TRUE;
1962 if (argrest[1] == 'm')
1964 if (++i >= argc) { badarg = TRUE; break; }
1965 expansion_test_message = argv[i];
1968 if (argrest[1] != 0) { badarg = TRUE; break; }
1971 /* -bF: Run system filter test */
1973 else if (*argrest == 'F')
1975 filter_test |= FTEST_SYSTEM;
1976 if (*(++argrest) != 0) { badarg = TRUE; break; }
1977 if (++i < argc) filter_test_sfile = argv[i]; else
1979 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1984 /* -bf: Run user filter test
1985 -bfd: Set domain for filter testing
1986 -bfl: Set local part for filter testing
1987 -bfp: Set prefix for filter testing
1988 -bfs: Set suffix for filter testing
1991 else if (*argrest == 'f')
1993 if (*(++argrest) == 0)
1995 filter_test |= FTEST_USER;
1996 if (++i < argc) filter_test_ufile = argv[i]; else
1998 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2006 fprintf(stderr, "exim: string expected after %s\n", arg);
2009 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2010 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2011 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2012 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2013 else { badarg = TRUE; break; }
2017 /* -bh: Host checking - an IP address must follow. */
2019 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2021 if (++i >= argc) { badarg = TRUE; break; }
2022 sender_host_address = argv[i];
2023 host_checking = checking = log_testing_mode = TRUE;
2024 host_checking_callout = argrest[1] == 'c';
2027 /* -bi: This option is used by sendmail to initialize *the* alias file,
2028 though it has the -oA option to specify a different file. Exim has no
2029 concept of *the* alias file, but since Sun's YP make script calls
2030 sendmail this way, some support must be provided. */
2032 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2034 /* -bI: provide information, of the type to follow after a colon.
2035 This is an Exim flag. */
2037 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2039 uschar *p = &argrest[2];
2040 info_flag = CMDINFO_HELP;
2043 if (strcmpic(p, CUS"sieve") == 0)
2045 info_flag = CMDINFO_SIEVE;
2048 else if (strcmpic(p, CUS"dscp") == 0)
2050 info_flag = CMDINFO_DSCP;
2053 else if (strcmpic(p, CUS"help") == 0)
2060 /* -bm: Accept and deliver message - the default option. Reinstate
2061 receiving_message, which got turned off for all -b options. */
2063 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2065 /* -bmalware: test the filename given for malware */
2067 else if (Ustrcmp(argrest, "malware") == 0)
2069 if (++i >= argc) { badarg = TRUE; break; }
2070 malware_test_file = argv[i];
2073 /* -bnq: For locally originating messages, do not qualify unqualified
2074 addresses. In the envelope, this causes errors; in header lines they
2077 else if (Ustrcmp(argrest, "nq") == 0)
2079 allow_unqualified_sender = FALSE;
2080 allow_unqualified_recipient = FALSE;
2083 /* -bpxx: List the contents of the mail queue, in various forms. If
2084 the option is -bpc, just a queue count is needed. Otherwise, if the
2085 first letter after p is r, then order is random. */
2087 else if (*argrest == 'p')
2089 if (*(++argrest) == 'c')
2092 if (*(++argrest) != 0) badarg = TRUE;
2096 if (*argrest == 'r')
2098 list_queue_option = 8;
2101 else list_queue_option = 0;
2105 /* -bp: List the contents of the mail queue, top-level only */
2107 if (*argrest == 0) {}
2109 /* -bpu: List the contents of the mail queue, top-level undelivered */
2111 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2113 /* -bpa: List the contents of the mail queue, including all delivered */
2115 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2117 /* Unknown after -bp[r] */
2127 /* -bP: List the configuration variables given as the address list.
2128 Force -v, so configuration errors get displayed. */
2130 else if (Ustrcmp(argrest, "P") == 0)
2132 list_options = TRUE;
2133 debug_selector |= D_v;
2134 debug_file = stderr;
2137 /* -brt: Test retry configuration lookup */
2139 else if (Ustrcmp(argrest, "rt") == 0)
2141 test_retry_arg = i + 1;
2145 /* -brw: Test rewrite configuration */
2147 else if (Ustrcmp(argrest, "rw") == 0)
2149 test_rewrite_arg = i + 1;
2153 /* -bS: Read SMTP commands on standard input, but produce no replies -
2154 all errors are reported by sending messages. */
2156 else if (Ustrcmp(argrest, "S") == 0)
2157 smtp_input = smtp_batched_input = receiving_message = TRUE;
2159 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2160 on standard output. */
2162 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2164 /* -bt: address testing mode */
2166 else if (Ustrcmp(argrest, "t") == 0)
2167 address_test_mode = checking = log_testing_mode = TRUE;
2169 /* -bv: verify addresses */
2171 else if (Ustrcmp(argrest, "v") == 0)
2172 verify_address_mode = checking = log_testing_mode = TRUE;
2174 /* -bvs: verify sender addresses */
2176 else if (Ustrcmp(argrest, "vs") == 0)
2178 verify_address_mode = checking = log_testing_mode = TRUE;
2179 verify_as_sender = TRUE;
2182 /* -bV: Print version string and support details */
2184 else if (Ustrcmp(argrest, "V") == 0)
2186 printf("Exim version %s #%s built %s\n", version_string,
2187 version_cnumber, version_date);
2188 printf("%s\n", CS version_copyright);
2189 version_printed = TRUE;
2190 show_whats_supported(stdout);
2193 /* -bw: inetd wait mode, accept a listening socket as stdin */
2195 else if (*argrest == 'w')
2197 inetd_wait_mode = TRUE;
2198 background_daemon = FALSE;
2199 daemon_listen = TRUE;
2200 if (*(++argrest) != '\0')
2202 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2203 if (inetd_wait_timeout <= 0)
2205 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2215 /* -C: change configuration file list; ignore if it isn't really
2216 a change! Enforce a prefix check if required. */
2221 if(++i < argc) argrest = argv[i]; else
2222 { badarg = TRUE; break; }
2224 if (Ustrcmp(config_main_filelist, argrest) != 0)
2226 #ifdef ALT_CONFIG_PREFIX
2228 int len = Ustrlen(ALT_CONFIG_PREFIX);
2229 uschar *list = argrest;
2231 while((filename = string_nextinlist(&list, &sep, big_buffer,
2232 big_buffer_size)) != NULL)
2234 if ((Ustrlen(filename) < len ||
2235 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2236 Ustrstr(filename, "/../") != NULL) &&
2237 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2239 fprintf(stderr, "-C Permission denied\n");
2244 if (real_uid != root_uid)
2246 #ifdef TRUSTED_CONFIG_LIST
2248 if (real_uid != exim_uid
2249 #ifdef CONFIGURE_OWNER
2250 && real_uid != config_uid
2253 trusted_config = FALSE;
2256 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2259 struct stat statbuf;
2261 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2262 (statbuf.st_uid != root_uid /* owner not root */
2263 #ifdef CONFIGURE_OWNER
2264 && statbuf.st_uid != config_uid /* owner not the special one */
2267 (statbuf.st_gid != root_gid /* group not root */
2268 #ifdef CONFIGURE_GROUP
2269 && statbuf.st_gid != config_gid /* group not the special one */
2271 && (statbuf.st_mode & 020) != 0 /* group writeable */
2273 (statbuf.st_mode & 2) != 0) /* world writeable */
2275 trusted_config = FALSE;
2280 /* Well, the trust list at least is up to scratch... */
2281 void *reset_point = store_get(0);
2282 uschar *trusted_configs[32];
2286 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2288 uschar *start = big_buffer, *nl;
2289 while (*start && isspace(*start))
2293 nl = Ustrchr(start, '\n');
2296 trusted_configs[nr_configs++] = string_copy(start);
2297 if (nr_configs == 32)
2305 uschar *list = argrest;
2307 while (trusted_config && (filename = string_nextinlist(&list,
2308 &sep, big_buffer, big_buffer_size)) != NULL)
2310 for (i=0; i < nr_configs; i++)
2312 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2315 if (i == nr_configs)
2317 trusted_config = FALSE;
2321 store_reset(reset_point);
2325 /* No valid prefixes found in trust_list file. */
2326 trusted_config = FALSE;
2332 /* Could not open trust_list file. */
2333 trusted_config = FALSE;
2337 /* Not root; don't trust config */
2338 trusted_config = FALSE;
2342 config_main_filelist = argrest;
2343 config_changed = TRUE;
2348 /* -D: set up a macro definition */
2351 #ifdef DISABLE_D_OPTION
2352 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2357 macro_item *mlast = NULL;
2360 uschar *s = argrest;
2362 while (isspace(*s)) s++;
2364 if (*s < 'A' || *s > 'Z')
2366 fprintf(stderr, "exim: macro name set by -D must start with "
2367 "an upper case letter\n");
2371 while (isalnum(*s) || *s == '_')
2373 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2377 if (ptr == 0) { badarg = TRUE; break; }
2378 while (isspace(*s)) s++;
2381 if (*s++ != '=') { badarg = TRUE; break; }
2382 while (isspace(*s)) s++;
2385 for (m = macros; m != NULL; m = m->next)
2387 if (Ustrcmp(m->name, name) == 0)
2389 fprintf(stderr, "exim: duplicated -D in command line\n");
2395 m = store_get(sizeof(macro_item) + Ustrlen(name));
2397 m->command_line = TRUE;
2398 if (mlast == NULL) macros = m; else mlast->next = m;
2399 Ustrcpy(m->name, name);
2400 m->replacement = string_copy(s);
2402 if (clmacro_count >= MAX_CLMACROS)
2404 fprintf(stderr, "exim: too many -D options on command line\n");
2407 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2413 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2414 The latter is now a no-op, retained for compatibility only. If -dd is used,
2415 debugging subprocesses of the daemon is disabled. */
2418 if (Ustrcmp(argrest, "ropcr") == 0)
2420 /* drop_cr = TRUE; */
2423 /* Use an intermediate variable so that we don't set debugging while
2424 decoding the debugging bits. */
2428 unsigned int selector = D_default;
2431 if (*argrest == 'd')
2433 debug_daemon = TRUE;
2437 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2438 debug_options_count, US"debug", 0);
2439 debug_selector = selector;
2444 /* -E: This is a local error message. This option is not intended for
2445 external use at all, but is not restricted to trusted callers because it
2446 does no harm (just suppresses certain error messages) and if Exim is run
2447 not setuid root it won't always be trusted when it generates error
2448 messages using this option. If there is a message id following -E, point
2449 message_reference at it, for logging. */
2452 local_error_message = TRUE;
2453 if (mac_ismsgid(argrest)) message_reference = argrest;
2457 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2458 option, so it looks as if historically the -oex options are also callable
2459 without the leading -o. So we have to accept them. Before the switch,
2460 anything starting -oe has been converted to -e. Exim does not support all
2461 of the sendmail error options. */
2464 if (Ustrcmp(argrest, "e") == 0)
2466 arg_error_handling = ERRORS_SENDER;
2467 errors_sender_rc = EXIT_SUCCESS;
2469 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2470 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2471 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2472 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2477 /* -F: Set sender's full name, used instead of the gecos entry from
2478 the password file. Since users can usually alter their gecos entries,
2479 there's no security involved in using this instead. The data can follow
2480 the -F or be in the next argument. */
2485 if(++i < argc) argrest = argv[i]; else
2486 { badarg = TRUE; break; }
2488 originator_name = argrest;
2489 sender_name_forced = TRUE;
2493 /* -f: Set sender's address - this value is only actually used if Exim is
2494 run by a trusted user, or if untrusted_set_sender is set and matches the
2495 address, except that the null address can always be set by any user. The
2496 test for this happens later, when the value given here is ignored when not
2497 permitted. For an untrusted user, the actual sender is still put in Sender:
2498 if it doesn't match the From: header (unless no_local_from_check is set).
2499 The data can follow the -f or be in the next argument. The -r switch is an
2500 obsolete form of -f but since there appear to be programs out there that
2501 use anything that sendmail has ever supported, better accept it - the
2502 synonymizing is done before the switch above.
2504 At this stage, we must allow domain literal addresses, because we don't
2505 know what the setting of allow_domain_literals is yet. Ditto for trailing
2506 dots and strip_trailing_dot. */
2514 if (i+1 < argc) argrest = argv[++i]; else
2515 { badarg = TRUE; break; }
2519 sender_address = string_sprintf(""); /* Ensure writeable memory */
2523 uschar *temp = argrest + Ustrlen(argrest) - 1;
2524 while (temp >= argrest && isspace(*temp)) temp--;
2525 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2526 allow_domain_literals = TRUE;
2527 strip_trailing_dot = TRUE;
2528 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2529 &sender_address_domain, TRUE);
2530 allow_domain_literals = FALSE;
2531 strip_trailing_dot = FALSE;
2532 if (sender_address == NULL)
2534 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2535 return EXIT_FAILURE;
2538 sender_address_forced = TRUE;
2542 /* -G: sendmail invocation to specify that it's a gateway submission and
2543 sendmail may complain about problems instead of fixing them.
2544 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2545 not at this time complain about problems. */
2551 /* -h: Set the hop count for an incoming message. Exim does not currently
2552 support this; it always computes it by counting the Received: headers.
2553 To put it in will require a change to the spool header file format. */
2558 if(++i < argc) argrest = argv[i]; else
2559 { badarg = TRUE; break; }
2561 if (!isdigit(*argrest)) badarg = TRUE;
2565 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2566 not to be documented for sendmail but mailx (at least) uses it) */
2569 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2573 /* -L: set the identifier used for syslog; equivalent to setting
2574 syslog_processname in the config file, but needs to be an admin option. */
2577 if (*argrest == '\0')
2579 if(++i < argc) argrest = argv[i]; else
2580 { badarg = TRUE; break; }
2582 sz = Ustrlen(argrest);
2585 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2586 return EXIT_FAILURE;
2590 fprintf(stderr, "exim: the -L syslog name is too short\n");
2591 return EXIT_FAILURE;
2593 cmdline_syslog_name = argrest;
2597 receiving_message = FALSE;
2599 /* -MC: continue delivery of another message via an existing open
2600 file descriptor. This option is used for an internal call by the
2601 smtp transport when there is a pending message waiting to go to an
2602 address to which it has got a connection. Five subsequent arguments are
2603 required: transport name, host name, IP address, sequence number, and
2604 message_id. Transports may decline to create new processes if the sequence
2605 number gets too big. The channel is stdin. This (-MC) must be the last
2606 argument. There's a subsequent check that the real-uid is privileged.
2608 If we are running in the test harness. delay for a bit, to let the process
2609 that set this one up complete. This makes for repeatability of the logging,
2612 if (Ustrcmp(argrest, "C") == 0)
2614 union sockaddr_46 interface_sock;
2615 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2619 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2620 return EXIT_FAILURE;
2623 if (msg_action_arg >= 0)
2625 fprintf(stderr, "exim: incompatible arguments\n");
2626 return EXIT_FAILURE;
2629 continue_transport = argv[++i];
2630 continue_hostname = argv[++i];
2631 continue_host_address = argv[++i];
2632 continue_sequence = Uatoi(argv[++i]);
2633 msg_action = MSG_DELIVER;
2634 msg_action_arg = ++i;
2635 forced_delivery = TRUE;
2636 queue_run_pid = passed_qr_pid;
2637 queue_run_pipe = passed_qr_pipe;
2639 if (!mac_ismsgid(argv[i]))
2641 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2643 return EXIT_FAILURE;
2646 /* Set up $sending_ip_address and $sending_port */
2648 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2650 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2654 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2656 return EXIT_FAILURE;
2659 if (running_in_test_harness) millisleep(500);
2663 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2664 precedes -MC (see above). The flag indicates that the host to which
2665 Exim is connected has accepted an AUTH sequence. */
2667 else if (Ustrcmp(argrest, "CA") == 0)
2669 smtp_authenticated = TRUE;
2673 #ifdef EXPERIMENTAL_DSN
2674 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2675 that exim is connected to supports the esmtp extension DSN */
2676 else if (strcmp(argrest, "CD") == 0)
2678 smtp_use_dsn = TRUE;
2683 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2684 it preceded -MC (see above) */
2686 else if (Ustrcmp(argrest, "CP") == 0)
2688 smtp_use_pipelining = TRUE;
2692 /* -MCQ: pass on the pid of the queue-running process that started
2693 this chain of deliveries and the fd of its synchronizing pipe; this
2694 is useful only when it precedes -MC (see above) */
2696 else if (Ustrcmp(argrest, "CQ") == 0)
2698 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2700 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2705 /* -MCS: set the smtp_use_size flag; this is useful only when it
2706 precedes -MC (see above) */
2708 else if (Ustrcmp(argrest, "CS") == 0)
2710 smtp_use_size = TRUE;
2714 /* -MCT: set the tls_offered flag; this is useful only when it
2715 precedes -MC (see above). The flag indicates that the host to which
2716 Exim is connected has offered TLS support. */
2719 else if (Ustrcmp(argrest, "CT") == 0)
2726 /* -M[x]: various operations on the following list of message ids:
2727 -M deliver the messages, ignoring next retry times and thawing
2728 -Mc deliver the messages, checking next retry times, no thawing
2729 -Mf freeze the messages
2730 -Mg give up on the messages
2731 -Mt thaw the messages
2732 -Mrm remove the messages
2733 In the above cases, this must be the last option. There are also the
2734 following options which are followed by a single message id, and which
2735 act on that message. Some of them use the "recipient" addresses as well.
2736 -Mar add recipient(s)
2737 -Mmad mark all recipients delivered
2738 -Mmd mark recipients(s) delivered
2740 -Mset load a message for use with -be
2742 -Mvc show copy (of whole message, in RFC 2822 format)
2747 else if (*argrest == 0)
2749 msg_action = MSG_DELIVER;
2750 forced_delivery = deliver_force_thaw = TRUE;
2752 else if (Ustrcmp(argrest, "ar") == 0)
2754 msg_action = MSG_ADD_RECIPIENT;
2755 one_msg_action = TRUE;
2757 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2758 else if (Ustrcmp(argrest, "es") == 0)
2760 msg_action = MSG_EDIT_SENDER;
2761 one_msg_action = TRUE;
2763 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2764 else if (Ustrcmp(argrest, "g") == 0)
2766 msg_action = MSG_DELIVER;
2767 deliver_give_up = TRUE;
2769 else if (Ustrcmp(argrest, "mad") == 0)
2771 msg_action = MSG_MARK_ALL_DELIVERED;
2773 else if (Ustrcmp(argrest, "md") == 0)
2775 msg_action = MSG_MARK_DELIVERED;
2776 one_msg_action = TRUE;
2778 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2779 else if (Ustrcmp(argrest, "set") == 0)
2781 msg_action = MSG_LOAD;
2782 one_msg_action = TRUE;
2784 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2785 else if (Ustrcmp(argrest, "vb") == 0)
2787 msg_action = MSG_SHOW_BODY;
2788 one_msg_action = TRUE;
2790 else if (Ustrcmp(argrest, "vc") == 0)
2792 msg_action = MSG_SHOW_COPY;
2793 one_msg_action = TRUE;
2795 else if (Ustrcmp(argrest, "vh") == 0)
2797 msg_action = MSG_SHOW_HEADER;
2798 one_msg_action = TRUE;
2800 else if (Ustrcmp(argrest, "vl") == 0)
2802 msg_action = MSG_SHOW_LOG;
2803 one_msg_action = TRUE;
2805 else { badarg = TRUE; break; }
2807 /* All the -Mxx options require at least one message id. */
2809 msg_action_arg = i + 1;
2810 if (msg_action_arg >= argc)
2812 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2813 return EXIT_FAILURE;
2816 /* Some require only message ids to follow */
2818 if (!one_msg_action)
2821 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2823 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2825 return EXIT_FAILURE;
2827 goto END_ARG; /* Remaining args are ids */
2830 /* Others require only one message id, possibly followed by addresses,
2831 which will be handled as normal arguments. */
2835 if (!mac_ismsgid(argv[msg_action_arg]))
2837 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2838 argv[msg_action_arg], arg);
2839 return EXIT_FAILURE;
2846 /* Some programs seem to call the -om option without the leading o;
2847 for sendmail it askes for "me too". Exim always does this. */
2850 if (*argrest != 0) badarg = TRUE;
2854 /* -N: don't do delivery - a debugging option that stops transports doing
2855 their thing. It implies debugging at the D_v level. */
2860 dont_deliver = TRUE;
2861 debug_selector |= D_v;
2862 debug_file = stderr;
2868 /* -n: This means "don't alias" in sendmail, apparently.
2869 For normal invocations, it has no effect.
2870 It may affect some other options. */
2876 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2877 option to the specified value. This form uses long names. We need to handle
2878 -O option=value and -Ooption=value. */
2885 fprintf(stderr, "exim: string expected after -O\n");
2893 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2896 if (*argrest == 'A')
2898 alias_arg = argrest + 1;
2899 if (alias_arg[0] == 0)
2901 if (i+1 < argc) alias_arg = argv[++i]; else
2903 fprintf(stderr, "exim: string expected after -oA\n");
2909 /* -oB: Set a connection message max value for remote deliveries */
2911 else if (*argrest == 'B')
2913 uschar *p = argrest + 1;
2916 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2918 connection_max_messages = 1;
2927 fprintf(stderr, "exim: number expected after -oB\n");
2930 connection_max_messages = Uatoi(p);
2934 /* -odb: background delivery */
2936 else if (Ustrcmp(argrest, "db") == 0)
2938 synchronous_delivery = FALSE;
2939 arg_queue_only = FALSE;
2940 queue_only_set = TRUE;
2943 /* -odf: foreground delivery (smail-compatible option); same effect as
2944 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2947 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2949 synchronous_delivery = TRUE;
2950 arg_queue_only = FALSE;
2951 queue_only_set = TRUE;
2954 /* -odq: queue only */
2956 else if (Ustrcmp(argrest, "dq") == 0)
2958 synchronous_delivery = FALSE;
2959 arg_queue_only = TRUE;
2960 queue_only_set = TRUE;
2963 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2964 but no remote delivery */
2966 else if (Ustrcmp(argrest, "dqs") == 0)
2969 arg_queue_only = FALSE;
2970 queue_only_set = TRUE;
2973 /* -oex: Sendmail error flags. As these are also accepted without the
2974 leading -o prefix, for compatibility with vacation and other callers,
2975 they are handled with -e above. */
2977 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2978 -oitrue: Another sendmail syntax for the same */
2980 else if (Ustrcmp(argrest, "i") == 0 ||
2981 Ustrcmp(argrest, "itrue") == 0)
2984 /* -oM*: Set various characteristics for an incoming message; actually
2985 acted on for trusted callers only. */
2987 else if (*argrest == 'M')
2991 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2995 /* -oMa: Set sender host address */
2997 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2999 /* -oMaa: Set authenticator name */
3001 else if (Ustrcmp(argrest, "Maa") == 0)
3002 sender_host_authenticated = argv[++i];
3004 /* -oMas: setting authenticated sender */
3006 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3008 /* -oMai: setting authenticated id */
3010 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3012 /* -oMi: Set incoming interface address */
3014 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3016 /* -oMm: Message reference */
3018 else if (Ustrcmp(argrest, "Mm") == 0)
3020 if (!mac_ismsgid(argv[i+1]))
3022 fprintf(stderr,"-oMm must be a valid message ID\n");
3025 if (!trusted_config)
3027 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3030 message_reference = argv[++i];
3033 /* -oMr: Received protocol */
3035 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3037 /* -oMs: Set sender host name */
3039 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3041 /* -oMt: Set sender ident */
3043 else if (Ustrcmp(argrest, "Mt") == 0)
3045 sender_ident_set = TRUE;
3046 sender_ident = argv[++i];
3049 /* Else a bad argument */
3058 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3059 seem to call this as -m (undocumented), so that is also accepted (see
3062 else if (Ustrcmp(argrest, "m") == 0) {}
3064 /* -oo: An ancient flag for old-style addresses which still seems to
3065 crop up in some calls (see in SCO). */
3067 else if (Ustrcmp(argrest, "o") == 0) {}
3069 /* -oP <name>: set pid file path for daemon */
3071 else if (Ustrcmp(argrest, "P") == 0)
3072 override_pid_file_path = argv[++i];
3074 /* -or <n>: set timeout for non-SMTP acceptance
3075 -os <n>: set timeout for SMTP acceptance */
3077 else if (*argrest == 'r' || *argrest == 's')
3079 int *tp = (*argrest == 'r')?
3080 &arg_receive_timeout : &arg_smtp_receive_timeout;
3081 if (argrest[1] == 0)
3083 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3085 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3088 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3093 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3095 else if (Ustrcmp(argrest, "X") == 0)
3096 override_local_interfaces = argv[++i];
3098 /* Unknown -o argument */
3104 /* -ps: force Perl startup; -pd force delayed Perl startup */
3108 if (*argrest == 's' && argrest[1] == 0)
3110 perl_start_option = 1;
3113 if (*argrest == 'd' && argrest[1] == 0)
3115 perl_start_option = -1;
3120 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3121 which sets the host protocol and host name */
3125 if (i+1 < argc) argrest = argv[++i]; else
3126 { badarg = TRUE; break; }
3131 uschar *hn = Ustrchr(argrest, ':');
3134 received_protocol = argrest;
3138 received_protocol = string_copyn(argrest, hn - argrest);
3139 sender_host_name = hn + 1;
3146 receiving_message = FALSE;
3147 if (queue_interval >= 0)
3149 fprintf(stderr, "exim: -q specified more than once\n");
3153 /* -qq...: Do queue runs in a 2-stage manner */
3155 if (*argrest == 'q')
3157 queue_2stage = TRUE;
3161 /* -qi...: Do only first (initial) deliveries */
3163 if (*argrest == 'i')
3165 queue_run_first_delivery = TRUE;
3169 /* -qf...: Run the queue, forcing deliveries
3170 -qff..: Ditto, forcing thawing as well */
3172 if (*argrest == 'f')
3174 queue_run_force = TRUE;
3175 if (*(++argrest) == 'f')
3177 deliver_force_thaw = TRUE;
3182 /* -q[f][f]l...: Run the queue only on local deliveries */
3184 if (*argrest == 'l')
3186 queue_run_local = TRUE;
3190 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3191 optionally starting from a given message id. */
3193 if (*argrest == 0 &&
3194 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3197 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3198 start_queue_run_id = argv[++i];
3199 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3200 stop_queue_run_id = argv[++i];
3203 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3204 optionally local only. */
3209 queue_interval = readconf_readtime(argrest, 0, FALSE);
3211 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3212 if (queue_interval <= 0)
3214 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3221 case 'R': /* Synonymous with -qR... */
3222 receiving_message = FALSE;
3224 /* -Rf: As -R (below) but force all deliveries,
3225 -Rff: Ditto, but also thaw all frozen messages,
3226 -Rr: String is regex
3227 -Rrf: Regex and force
3228 -Rrff: Regex and force and thaw
3230 in all cases provided there are no further characters in this
3236 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3238 if (Ustrcmp(argrest, rsopts[i]) == 0)
3240 if (i != 2) queue_run_force = TRUE;
3241 if (i >= 2) deliver_selectstring_regex = TRUE;
3242 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3243 argrest += Ustrlen(rsopts[i]);
3248 /* -R: Set string to match in addresses for forced queue run to
3249 pick out particular messages. */
3253 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3255 fprintf(stderr, "exim: string expected after -R\n");
3259 else deliver_selectstring = argrest;
3263 /* -r: an obsolete synonym for -f (see above) */
3266 /* -S: Like -R but works on sender. */
3268 case 'S': /* Synonymous with -qS... */
3269 receiving_message = FALSE;
3271 /* -Sf: As -S (below) but force all deliveries,
3272 -Sff: Ditto, but also thaw all frozen messages,
3273 -Sr: String is regex
3274 -Srf: Regex and force
3275 -Srff: Regex and force and thaw
3277 in all cases provided there are no further characters in this
3283 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3285 if (Ustrcmp(argrest, rsopts[i]) == 0)
3287 if (i != 2) queue_run_force = TRUE;
3288 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3289 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3290 argrest += Ustrlen(rsopts[i]);
3295 /* -S: Set string to match in addresses for forced queue run to
3296 pick out particular messages. */
3300 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3302 fprintf(stderr, "exim: string expected after -S\n");
3306 else deliver_selectstring_sender = argrest;
3309 /* -Tqt is an option that is exclusively for use by the testing suite.
3310 It is not recognized in other circumstances. It allows for the setting up
3311 of explicit "queue times" so that various warning/retry things can be
3312 tested. Otherwise variability of clock ticks etc. cause problems. */
3315 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3316 fudged_queue_times = argv[++i];
3321 /* -t: Set flag to extract recipients from body of message. */
3324 if (*argrest == 0) extract_recipients = TRUE;
3326 /* -ti: Set flag to extract recipients from body of message, and also
3327 specify that dot does not end the message. */
3329 else if (Ustrcmp(argrest, "i") == 0)
3331 extract_recipients = TRUE;
3335 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3338 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3345 /* -U: This means "initial user submission" in sendmail, apparently. The
3346 doc claims that in future sendmail may refuse syntactically invalid
3347 messages instead of fixing them. For the moment, we just ignore it. */
3353 /* -v: verify things - this is a very low-level debugging */
3358 debug_selector |= D_v;
3359 debug_file = stderr;
3365 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3367 The -x flag tells the sendmail command that mail from a local
3368 mail program has National Language Support (NLS) extended characters
3369 in the body of the mail item. The sendmail command can send mail with
3370 extended NLS characters across networks that normally corrupts these
3373 As Exim is 8-bit clean, it just ignores this flag. */
3376 if (*argrest != 0) badarg = TRUE;
3379 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3380 logs to that file. We swallow the parameter and otherwise ignore it. */
3383 if (*argrest == '\0')
3387 fprintf(stderr, "exim: string expected after -X\n");
3393 /* All other initial characters are errors */
3398 } /* End of high-level switch statement */
3400 /* Failed to recognize the option, or syntax error */
3404 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3405 "option %s\n", arg);
3411 /* If -R or -S have been specified without -q, assume a single queue run. */
3413 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3414 queue_interval < 0) queue_interval = 0;
3418 /* If usage_wanted is set we call the usage function - which never returns */
3419 if (usage_wanted) exim_usage(called_as);
3421 /* Arguments have been processed. Check for incompatibilities. */
3423 (smtp_input || extract_recipients || recipients_arg < argc) &&
3424 (daemon_listen || queue_interval >= 0 || bi_option ||
3425 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3426 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3429 msg_action_arg > 0 &&
3430 (daemon_listen || queue_interval >= 0 || list_options ||
3431 (checking && msg_action != MSG_LOAD) ||
3432 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3435 (daemon_listen || queue_interval >= 0) &&
3436 (sender_address != NULL || list_options || list_queue || checking ||
3440 daemon_listen && queue_interval == 0
3443 inetd_wait_mode && queue_interval >= 0
3447 (checking || smtp_input || extract_recipients ||
3448 filter_test != FTEST_NONE || bi_option)
3451 verify_address_mode &&
3452 (address_test_mode || smtp_input || extract_recipients ||
3453 filter_test != FTEST_NONE || bi_option)
3456 address_test_mode && (smtp_input || extract_recipients ||
3457 filter_test != FTEST_NONE || bi_option)
3460 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3464 deliver_selectstring != NULL && queue_interval < 0
3467 msg_action == MSG_LOAD &&
3468 (!expansion_test || expansion_test_message != NULL)
3472 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3476 /* If debugging is set up, set the file and the file descriptor to pass on to
3477 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3478 to run in the foreground. */
3480 if (debug_selector != 0)
3482 debug_file = stderr;
3483 debug_fd = fileno(debug_file);
3484 background_daemon = FALSE;
3485 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3486 if (debug_selector != D_v) /* -v only doesn't show this */
3488 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3489 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3491 if (!version_printed)
3492 show_whats_supported(stderr);
3496 /* When started with root privilege, ensure that the limits on the number of
3497 open files and the number of processes (where that is accessible) are
3498 sufficiently large, or are unset, in case Exim has been called from an
3499 environment where the limits are screwed down. Not all OS have the ability to
3500 change some of these limits. */
3504 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3510 #ifdef RLIMIT_NOFILE
3511 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3513 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3515 rlp.rlim_cur = rlp.rlim_max = 0;
3518 /* I originally chose 1000 as a nice big number that was unlikely to
3519 be exceeded. It turns out that some older OS have a fixed upper limit of
3522 if (rlp.rlim_cur < 1000)
3524 rlp.rlim_cur = rlp.rlim_max = 1000;
3525 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3527 rlp.rlim_cur = rlp.rlim_max = 256;
3528 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3529 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3536 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3538 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3540 rlp.rlim_cur = rlp.rlim_max = 0;
3543 #ifdef RLIM_INFINITY
3544 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3546 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3548 if (rlp.rlim_cur < 1000)
3550 rlp.rlim_cur = rlp.rlim_max = 1000;
3552 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3553 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3559 /* Exim is normally entered as root (but some special configurations are
3560 possible that don't do this). However, it always spins off sub-processes that
3561 set their uid and gid as required for local delivery. We don't want to pass on
3562 any extra groups that root may belong to, so we want to get rid of them all at
3565 We need to obey setgroups() at this stage, before possibly giving up root
3566 privilege for a changed configuration file, but later on we might need to
3567 check on the additional groups for the admin user privilege - can't do that
3568 till after reading the config, which might specify the exim gid. Therefore,
3569 save the group list here first. */
3571 group_count = getgroups(NGROUPS_MAX, group_list);
3572 if (group_count < 0)
3574 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3578 /* There is a fundamental difference in some BSD systems in the matter of
3579 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3580 known not to be different. On the "different" systems there is a single group
3581 list, and the first entry in it is the current group. On all other versions of
3582 Unix there is a supplementary group list, which is in *addition* to the current
3583 group. Consequently, to get rid of all extraneous groups on a "standard" system
3584 you pass over 0 groups to setgroups(), while on a "different" system you pass
3585 over a single group - the current group, which is always the first group in the
3586 list. Calling setgroups() with zero groups on a "different" system results in
3587 an error return. The following code should cope with both types of system.
3589 However, if this process isn't running as root, setgroups() can't be used
3590 since you have to be root to run it, even if throwing away groups. Not being
3591 root here happens only in some unusual configurations. We just ignore the
3594 if (setgroups(0, NULL) != 0)
3596 if (setgroups(1, group_list) != 0 && !unprivileged)
3598 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3603 /* If the configuration file name has been altered by an argument on the
3604 command line (either a new file name or a macro definition) and the caller is
3605 not root, or if this is a filter testing run, remove any setuid privilege the
3606 program has and run as the underlying user.
3608 The exim user is locked out of this, which severely restricts the use of -C
3611 Otherwise, set the real ids to the effective values (should be root unless run
3612 from inetd, which it can either be root or the exim uid, if one is configured).
3614 There is a private mechanism for bypassing some of this, in order to make it
3615 possible to test lots of configurations automatically, without having either to
3616 recompile each time, or to patch in an actual configuration file name and other
3617 values (such as the path name). If running in the test harness, pretend that
3618 configuration file changes and macro definitions haven't happened. */
3621 (!trusted_config || /* Config changed, or */
3622 !macros_trusted()) && /* impermissible macros and */
3623 real_uid != root_uid && /* Not root, and */
3624 !running_in_test_harness /* Not fudged */
3626 expansion_test /* expansion testing */
3628 filter_test != FTEST_NONE) /* Filter testing */
3630 setgroups(group_count, group_list);
3631 exim_setugid(real_uid, real_gid, FALSE,
3632 US"-C, -D, -be or -bf forces real uid");
3633 removed_privilege = TRUE;
3635 /* In the normal case when Exim is called like this, stderr is available
3636 and should be used for any logging information because attempts to write
3637 to the log will usually fail. To arrange this, we unset really_exim. However,
3638 if no stderr is available there is no point - we might as well have a go
3639 at the log (if it fails, syslog will be written).
3641 Note that if the invoker is Exim, the logs remain available. Messing with
3642 this causes unlogged successful deliveries. */
3644 if ((log_stderr != NULL) && (real_uid != exim_uid))
3645 really_exim = FALSE;
3648 /* Privilege is to be retained for the moment. It may be dropped later,
3649 depending on the job that this Exim process has been asked to do. For now, set
3650 the real uid to the effective so that subsequent re-execs of Exim are done by a
3653 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3655 /* If testing a filter, open the file(s) now, before wasting time doing other
3656 setups and reading the message. */
3658 if ((filter_test & FTEST_SYSTEM) != 0)
3660 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3663 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3665 return EXIT_FAILURE;
3669 if ((filter_test & FTEST_USER) != 0)
3671 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3674 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3676 return EXIT_FAILURE;
3680 /* Initialise lookup_list
3681 If debugging, already called above via version reporting.
3682 In either case, we initialise the list of available lookups while running
3683 as root. All dynamically modules are loaded from a directory which is
3684 hard-coded into the binary and is code which, if not a module, would be
3685 part of Exim already. Ability to modify the content of the directory
3686 is equivalent to the ability to modify a setuid binary!
3688 This needs to happen before we read the main configuration. */
3691 /* Read the main runtime configuration data; this gives up if there
3692 is a failure. It leaves the configuration file open so that the subsequent
3693 configuration data for delivery can be read if needed. */
3697 /* If an action on specific messages is requested, or if a daemon or queue
3698 runner is being started, we need to know if Exim was called by an admin user.
3699 This is the case if the real user is root or exim, or if the real group is
3700 exim, or if one of the supplementary groups is exim or a group listed in
3701 admin_groups. We don't fail all message actions immediately if not admin_user,
3702 since some actions can be performed by non-admin users. Instead, set admin_user
3703 for later interrogation. */
3705 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3710 for (i = 0; i < group_count; i++)
3712 if (group_list[i] == exim_gid) admin_user = TRUE;
3713 else if (admin_groups != NULL)
3715 for (j = 1; j <= (int)(admin_groups[0]); j++)
3716 if (admin_groups[j] == group_list[i])
3717 { admin_user = TRUE; break; }
3719 if (admin_user) break;
3723 /* Another group of privileged users are the trusted users. These are root,
3724 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3725 are permitted to specify sender_addresses with -f on the command line, and
3726 other message parameters as well. */
3728 if (real_uid == root_uid || real_uid == exim_uid)
3729 trusted_caller = TRUE;
3734 if (trusted_users != NULL)
3736 for (i = 1; i <= (int)(trusted_users[0]); i++)
3737 if (trusted_users[i] == real_uid)
3738 { trusted_caller = TRUE; break; }
3741 if (!trusted_caller && trusted_groups != NULL)
3743 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3745 if (trusted_groups[i] == real_gid)
3746 trusted_caller = TRUE;
3747 else for (j = 0; j < group_count; j++)
3749 if (trusted_groups[i] == group_list[j])
3750 { trusted_caller = TRUE; break; }
3752 if (trusted_caller) break;
3757 /* Handle the decoding of logging options. */
3759 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3760 log_selector_string, log_options, log_options_count, US"log", 0);
3764 debug_printf("configuration file is %s\n", config_main_filename);
3765 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3766 log_extra_selector);
3769 /* If domain literals are not allowed, check the sender address that was
3770 supplied with -f. Ditto for a stripped trailing dot. */
3772 if (sender_address != NULL)
3774 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3776 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3777 "allowed\n", sender_address);
3778 return EXIT_FAILURE;
3780 if (f_end_dot && !strip_trailing_dot)
3782 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3783 "(trailing dot not allowed)\n", sender_address);
3784 return EXIT_FAILURE;
3788 /* See if an admin user overrode our logging. */
3790 if (cmdline_syslog_name != NULL)
3794 syslog_processname = cmdline_syslog_name;
3795 log_file_path = string_copy(CUS"syslog");
3799 /* not a panic, non-privileged users should not be able to spam paniclog */
3801 "exim: you lack sufficient privilege to specify syslog process name\n");
3802 return EXIT_FAILURE;
3806 /* Paranoia check of maximum lengths of certain strings. There is a check
3807 on the length of the log file path in log.c, which will come into effect
3808 if there are any calls to write the log earlier than this. However, if we
3809 get this far but the string is very long, it is better to stop now than to
3810 carry on and (e.g.) receive a message and then have to collapse. The call to
3811 log_write() from here will cause the ultimate panic collapse if the complete
3812 file name exceeds the buffer length. */
3814 if (Ustrlen(log_file_path) > 200)
3815 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3816 "log_file_path is longer than 200 chars: aborting");
3818 if (Ustrlen(pid_file_path) > 200)
3819 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3820 "pid_file_path is longer than 200 chars: aborting");
3822 if (Ustrlen(spool_directory) > 200)
3823 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3824 "spool_directory is longer than 200 chars: aborting");
3826 /* Length check on the process name given to syslog for its TAG field,
3827 which is only permitted to be 32 characters or less. See RFC 3164. */
3829 if (Ustrlen(syslog_processname) > 32)
3830 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3831 "syslog_processname is longer than 32 chars: aborting");
3833 /* In some operating systems, the environment variable TMPDIR controls where
3834 temporary files are created; Exim doesn't use these (apart from when delivering
3835 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3836 If TMPDIR is found in the environment, reset it to the value defined in the
3837 TMPDIR macro, if this macro is defined. */
3842 for (p = USS environ; *p != NULL; p++)
3844 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3845 Ustrcmp(*p+7, TMPDIR) != 0)
3847 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3848 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3850 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3856 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3857 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3858 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3859 called by a user who has set the TZ variable. This then affects the timestamps
3860 in log files and in Received: headers, and any created Date: header lines. The
3861 required timezone is settable in the configuration file, so nothing can be done
3862 about this earlier - but hopefully nothing will normally be logged earlier than
3863 this. We have to make a new environment if TZ is wrong, but don't bother if
3864 timestamps_utc is set, because then all times are in UTC anyway. */
3866 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3868 timestamps_utc = TRUE;
3872 uschar *envtz = US getenv("TZ");
3873 if ((envtz == NULL && timezone_string != NULL) ||
3875 (timezone_string == NULL ||
3876 Ustrcmp(timezone_string, envtz) != 0)))
3878 uschar **p = USS environ;
3882 while (*p++ != NULL) count++;
3883 if (envtz == NULL) count++;
3884 newp = new = malloc(sizeof(uschar *) * (count + 1));
3885 for (p = USS environ; *p != NULL; p++)
3887 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3890 if (timezone_string != NULL)
3892 *newp = malloc(Ustrlen(timezone_string) + 4);
3893 sprintf(CS *newp++, "TZ=%s", timezone_string);
3898 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3899 tod_stamp(tod_log));
3903 /* Handle the case when we have removed the setuid privilege because of -C or
3904 -D. This means that the caller of Exim was not root.
3906 There is a problem if we were running as the Exim user. The sysadmin may
3907 expect this case to retain privilege because "the binary was called by the
3908 Exim user", but it hasn't, because either the -D option set macros, or the
3909 -C option set a non-trusted configuration file. There are two possibilities:
3911 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3912 to do message deliveries. Thus, the fact that it is running as a
3913 non-privileged user is plausible, and might be wanted in some special
3914 configurations. However, really_exim will have been set false when
3915 privilege was dropped, to stop Exim trying to write to its normal log
3916 files. Therefore, re-enable normal log processing, assuming the sysadmin
3917 has set up the log directory correctly.
3919 (2) If deliver_drop_privilege is not set, the configuration won't work as
3920 apparently intended, and so we log a panic message. In order to retain
3921 root for -C or -D, the caller must either be root or be invoking a
3922 trusted configuration file (when deliver_drop_privilege is false). */
3924 if (removed_privilege && (!trusted_config || macros != NULL) &&
3925 real_uid == exim_uid)
3927 if (deliver_drop_privilege)
3928 really_exim = TRUE; /* let logging work normally */
3930 log_write(0, LOG_MAIN|LOG_PANIC,
3931 "exim user lost privilege for using %s option",
3932 trusted_config? "-D" : "-C");
3935 /* Start up Perl interpreter if Perl support is configured and there is a
3936 perl_startup option, and the configuration or the command line specifies
3937 initializing starting. Note that the global variables are actually called
3938 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3941 if (perl_start_option != 0)
3942 opt_perl_at_start = (perl_start_option > 0);
3943 if (opt_perl_at_start && opt_perl_startup != NULL)
3946 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3947 errstr = init_perl(opt_perl_startup);
3950 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3951 return EXIT_FAILURE;
3953 opt_perl_started = TRUE;
3955 #endif /* EXIM_PERL */
3957 /* Log the arguments of the call if the configuration file said so. This is
3958 a debugging feature for finding out what arguments certain MUAs actually use.
3959 Don't attempt it if logging is disabled, or if listing variables or if
3960 verifying/testing addresses or expansions. */
3962 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3963 && really_exim && !list_options && !checking)
3966 uschar *p = big_buffer;
3968 Ustrcpy(p, "cwd= (failed)");
3969 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3971 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3973 for (i = 0; i < argc; i++)
3975 int len = Ustrlen(argv[i]);
3978 if (p + len + 8 >= big_buffer + big_buffer_size)
3981 log_write(0, LOG_MAIN, "%s", big_buffer);
3982 Ustrcpy(big_buffer, "...");
3985 printing = string_printing(argv[i]);
3986 if (printing[0] == 0) quote = US"\""; else
3988 uschar *pp = printing;
3990 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3992 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3993 (p - big_buffer) - 4), printing, quote);
3997 if ((log_extra_selector & LX_arguments) != 0)
3998 log_write(0, LOG_MAIN, "%s", big_buffer);
4000 debug_printf("%s\n", big_buffer);
4003 /* Set the working directory to be the top-level spool directory. We don't rely
4004 on this in the code, which always uses fully qualified names, but it's useful
4005 for core dumps etc. Don't complain if it fails - the spool directory might not
4006 be generally accessible and calls with the -C option (and others) have lost
4007 privilege by now. Before the chdir, we try to ensure that the directory exists.
4010 if (Uchdir(spool_directory) != 0)
4013 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4014 dummy = /* quieten compiler */ Uchdir(spool_directory);
4017 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4018 alias file. Exim doesn't have such a concept, but this call is screwed into
4019 Sun's YP makefiles. Handle this by calling a configured script, as the real
4020 user who called Exim. The -oA option can be used to pass an argument to the
4025 (void)fclose(config_file);
4026 if (bi_command != NULL)
4030 argv[i++] = bi_command;
4031 if (alias_arg != NULL) argv[i++] = alias_arg;
4034 setgroups(group_count, group_list);
4035 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4037 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4038 (argv[1] == NULL)? US"" : argv[1]);
4040 execv(CS argv[0], (char *const *)argv);
4041 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4046 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4051 /* We moved the admin/trusted check to be immediately after reading the
4052 configuration file. We leave these prints here to ensure that syslog setup,
4053 logfile setup, and so on has already happened. */
4055 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4056 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4058 /* Only an admin user may start the daemon or force a queue run in the default
4059 configuration, but the queue run restriction can be relaxed. Only an admin
4060 user may request that a message be returned to its sender forthwith. Only an
4061 admin user may specify a debug level greater than D_v (because it might show
4062 passwords, etc. in lookup queries). Only an admin user may request a queue
4063 count. Only an admin user can use the test interface to scan for email
4064 (because Exim will be in the spool dir and able to look at mails). */
4068 BOOL debugset = (debug_selector & ~D_v) != 0;
4069 if (deliver_give_up || daemon_listen || malware_test_file ||
4070 (count_queue && queue_list_requires_admin) ||
4071 (list_queue && queue_list_requires_admin) ||
4072 (queue_interval >= 0 && prod_requires_admin) ||
4073 (debugset && !running_in_test_harness))
4075 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4080 /* If the real user is not root or the exim uid, the argument for passing
4081 in an open TCP/IP connection for another message is not permitted, nor is
4082 running with the -N option for any delivery action, unless this call to exim is
4083 one that supplied an input message, or we are using a patched exim for
4084 regression testing. */
4086 if (real_uid != root_uid && real_uid != exim_uid &&
4087 (continue_hostname != NULL ||
4089 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4090 )) && !running_in_test_harness)
4092 fprintf(stderr, "exim: Permission denied\n");
4093 return EXIT_FAILURE;
4096 /* If the caller is not trusted, certain arguments are ignored when running for
4097 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4098 Note that authority for performing certain actions on messages is tested in the
4099 queue_action() function. */
4101 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4103 sender_host_name = sender_host_address = interface_address =
4104 sender_ident = received_protocol = NULL;
4105 sender_host_port = interface_port = 0;
4106 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4109 /* If a sender host address is set, extract the optional port number off the
4110 end of it and check its syntax. Do the same thing for the interface address.
4111 Exim exits if the syntax is bad. */
4115 if (sender_host_address != NULL)
4116 sender_host_port = check_port(sender_host_address);
4117 if (interface_address != NULL)
4118 interface_port = check_port(interface_address);
4121 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4126 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4127 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4131 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4132 return EXIT_FAILURE;
4136 /* If an SMTP message is being received check to see if the standard input is a
4137 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4138 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4143 union sockaddr_46 inetd_sock;
4144 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4145 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4147 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4148 if (family == AF_INET || family == AF_INET6)
4150 union sockaddr_46 interface_sock;
4151 size = sizeof(interface_sock);
4153 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4154 interface_address = host_ntoa(-1, &interface_sock, NULL,
4157 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4159 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4162 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4163 NULL, &sender_host_port);
4164 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4165 "inetd is not supported when mua_wrapper is set");
4170 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4171 return EXIT_FAILURE;
4177 /* If the load average is going to be needed while receiving a message, get it
4178 now for those OS that require the first call to os_getloadavg() to be done as
4179 root. There will be further calls later for each message received. */
4181 #ifdef LOAD_AVG_NEEDS_ROOT
4182 if (receiving_message &&
4183 (queue_only_load >= 0 ||
4184 (is_inetd && smtp_load_reserve >= 0)
4187 load_average = OS_GETLOADAVG();
4191 /* The queue_only configuration option can be overridden by -odx on the command
4192 line, except that if queue_only_override is false, queue_only cannot be unset
4193 from the command line. */
4195 if (queue_only_set && (queue_only_override || arg_queue_only))
4196 queue_only = arg_queue_only;
4198 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4201 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4202 if (arg_smtp_receive_timeout >= 0)
4203 smtp_receive_timeout = arg_smtp_receive_timeout;
4205 /* If Exim was started with root privilege, unless we have already removed the
4206 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4207 except when starting the daemon or doing some kind of delivery or address
4208 testing (-bt). These are the only cases when root need to be retained. We run
4209 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4210 retained only for starting the daemon. We always do the initgroups() in this
4211 situation (controlled by the TRUE below), in order to be as close as possible
4212 to the state Exim usually runs in. */
4214 if (!unprivileged && /* originally had root AND */
4215 !removed_privilege && /* still got root AND */
4216 !daemon_listen && /* not starting the daemon */
4217 queue_interval <= 0 && /* (either kind of daemon) */
4219 deliver_drop_privilege || /* requested unprivileged */
4221 queue_interval < 0 && /* not running the queue */
4222 (msg_action_arg < 0 || /* and */
4223 msg_action != MSG_DELIVER) && /* not delivering and */
4224 (!checking || !address_test_mode) /* not address checking */
4228 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4231 /* When we are retaining a privileged uid, we still change to the exim gid. */
4236 rv = setgid(exim_gid);
4237 /* Impact of failure is that some stuff might end up with an incorrect group.
4238 We track this for failures from root, since any attempt to change privilege
4239 by root should succeed and failures should be examined. For non-root,
4240 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4241 no need to complain then. */
4244 if (!(unprivileged || removed_privilege))
4247 "exim: changing group failed: %s\n", strerror(errno));
4251 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4252 (long int)exim_gid, strerror(errno));
4256 /* Handle a request to scan a file for malware */
4257 if (malware_test_file)
4259 #ifdef WITH_CONTENT_SCAN
4261 set_process_info("scanning file for malware");
4262 result = malware_in_file(malware_test_file);
4265 printf("No malware found.\n");
4270 printf("Malware lookup returned non-okay/fail: %d\n", result);
4274 printf("Malware found: %s\n", malware_name);
4276 printf("Malware scan detected malware of unknown name.\n");
4278 printf("Malware scanning not enabled at compile time.\n");
4283 /* Handle a request to list the delivery queue */
4287 set_process_info("listing the queue");
4288 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4292 /* Handle a request to count the delivery queue */
4296 set_process_info("counting the queue");
4301 /* Handle actions on specific messages, except for the force delivery and
4302 message load actions, which are done below. Some actions take a whole list of
4303 message ids, which are known to continue up to the end of the arguments. Others
4304 take a single message id and then operate on the recipients list. */
4306 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4308 int yield = EXIT_SUCCESS;
4309 set_process_info("acting on specified messages");
4311 if (!one_msg_action)
4313 for (i = msg_action_arg; i < argc; i++)
4314 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4315 yield = EXIT_FAILURE;
4318 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4319 recipients_arg)) yield = EXIT_FAILURE;
4323 /* We used to set up here to skip reading the ACL section, on
4324 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4325 Now, since the intro of the ${acl } expansion, ACL definitions may be
4326 needed in transports so we lost the optimisation. */
4330 /* The configuration data will have been read into POOL_PERM because we won't
4331 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4332 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4333 configuration were read into POOL_MAIN, because we don't do any resets till
4334 later on. However, it seems right, and it does ensure that both pools get used.
4337 store_pool = POOL_MAIN;
4339 /* Handle the -brt option. This is for checking out retry configurations.
4340 The next three arguments are a domain name or a complete address, and
4341 optionally two error numbers. All it does is to call the function that
4342 scans the retry configuration data. */
4344 if (test_retry_arg >= 0)
4346 retry_config *yield;
4347 int basic_errno = 0;
4351 if (test_retry_arg >= argc)
4353 printf("-brt needs a domain or address argument\n");
4354 exim_exit(EXIT_FAILURE);
4356 s1 = argv[test_retry_arg++];
4359 /* If the first argument contains no @ and no . it might be a local user
4360 or it might be a single-component name. Treat as a domain. */
4362 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4364 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4365 "being \ntreated as a one-component domain, not as a local part.\n\n",
4369 /* There may be an optional second domain arg. */
4371 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4372 s2 = argv[test_retry_arg++];
4374 /* The final arg is an error name */
4376 if (test_retry_arg < argc)
4378 uschar *ss = argv[test_retry_arg];
4380 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4383 printf("%s\n", CS error);
4384 return EXIT_FAILURE;
4387 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4388 code > 100 as an error is for matching codes to the decade. Turn them into
4389 a real error code, off the decade. */
4391 if (basic_errno == ERRNO_MAIL4XX ||
4392 basic_errno == ERRNO_RCPT4XX ||
4393 basic_errno == ERRNO_DATA4XX)
4395 int code = (more_errno >> 8) & 255;
4397 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4398 else if (code > 100)
4399 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4403 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4404 if (yield == NULL) printf("No retry information found\n"); else
4407 more_errno = yield->more_errno;
4408 printf("Retry rule: %s ", yield->pattern);
4410 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4412 printf("quota%s%s ",
4413 (more_errno > 0)? "_" : "",
4414 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4416 else if (yield->basic_errno == ECONNREFUSED)
4418 printf("refused%s%s ",
4419 (more_errno > 0)? "_" : "",
4420 (more_errno == 'M')? "MX" :
4421 (more_errno == 'A')? "A" : "");
4423 else if (yield->basic_errno == ETIMEDOUT)
4426 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4428 if (more_errno != 0) printf("_%s",
4429 (more_errno == 'M')? "MX" : "A");
4432 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4433 printf("auth_failed ");
4436 for (r = yield->rules; r != NULL; r = r->next)
4438 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4439 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4445 printf(",%d.", x/1000);
4459 exim_exit(EXIT_SUCCESS);
4462 /* Handle a request to list one or more configuration options */
4463 /* If -n was set, we suppress some information */
4467 set_process_info("listing variables");
4468 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4469 else for (i = recipients_arg; i < argc; i++)
4472 (Ustrcmp(argv[i], "router") == 0 ||
4473 Ustrcmp(argv[i], "transport") == 0 ||
4474 Ustrcmp(argv[i], "authenticator") == 0 ||
4475 Ustrcmp(argv[i], "macro") == 0))
4477 readconf_print(argv[i+1], argv[i], flag_n);
4480 else readconf_print(argv[i], NULL, flag_n);
4482 exim_exit(EXIT_SUCCESS);
4486 /* Handle a request to deliver one or more messages that are already on the
4487 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4488 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4490 Delivery of specific messages is typically used for a small number when
4491 prodding by hand (when the option forced_delivery will be set) or when
4492 re-execing to regain root privilege. Each message delivery must happen in a
4493 separate process, so we fork a process for each one, and run them sequentially
4494 so that debugging output doesn't get intertwined, and to avoid spawning too
4495 many processes if a long list is given. However, don't fork for the last one;
4496 this saves a process in the common case when Exim is called to deliver just one
4499 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4501 if (prod_requires_admin && !admin_user)
4503 fprintf(stderr, "exim: Permission denied\n");
4504 exim_exit(EXIT_FAILURE);
4506 set_process_info("delivering specified messages");
4507 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4508 for (i = msg_action_arg; i < argc; i++)
4513 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4514 else if ((pid = fork()) == 0)
4516 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4517 _exit(EXIT_SUCCESS);
4521 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4523 exim_exit(EXIT_FAILURE);
4527 exim_exit(EXIT_SUCCESS);
4531 /* If only a single queue run is requested, without SMTP listening, we can just
4532 turn into a queue runner, with an optional starting message id. */
4534 if (queue_interval == 0 && !daemon_listen)
4536 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4537 (start_queue_run_id == NULL)? US"" : US" starting at ",
4538 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4539 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4540 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4541 set_process_info("running the queue (single queue run)");
4542 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4543 exim_exit(EXIT_SUCCESS);
4547 /* Find the login name of the real user running this process. This is always
4548 needed when receiving a message, because it is written into the spool file. It
4549 may also be used to construct a from: or a sender: header, and in this case we
4550 need the user's full name as well, so save a copy of it, checked for RFC822
4551 syntax and munged if necessary, if it hasn't previously been set by the -F
4552 argument. We may try to get the passwd entry more than once, in case NIS or
4553 other delays are in evidence. Save the home directory for use in filter testing
4558 if ((pw = getpwuid(real_uid)) != NULL)
4560 originator_login = string_copy(US pw->pw_name);
4561 originator_home = string_copy(US pw->pw_dir);
4563 /* If user name has not been set by -F, set it from the passwd entry
4564 unless -f has been used to set the sender address by a trusted user. */
4566 if (originator_name == NULL)
4568 if (sender_address == NULL ||
4569 (!trusted_caller && filter_test == FTEST_NONE))
4571 uschar *name = US pw->pw_gecos;
4572 uschar *amp = Ustrchr(name, '&');
4575 /* Most Unix specify that a '&' character in the gecos field is
4576 replaced by a copy of the login name, and some even specify that
4577 the first character should be upper cased, so that's what we do. */
4582 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4583 amp - name, name, &loffset, originator_login, amp + 1);
4584 buffer[loffset] = toupper(buffer[loffset]);
4588 /* If a pattern for matching the gecos field was supplied, apply
4589 it and then expand the name string. */
4591 if (gecos_pattern != NULL && gecos_name != NULL)
4594 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4596 if (regex_match_and_setup(re, name, 0, -1))
4598 uschar *new_name = expand_string(gecos_name);
4600 if (new_name != NULL)
4602 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4603 "gecos field \"%s\"\n", new_name, name);
4606 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4607 "\"%s\": %s\n", gecos_name, expand_string_message);
4609 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4610 "gecos field \"%s\"\n", gecos_pattern, name);
4611 store_free((void *)re);
4613 originator_name = string_copy(name);
4616 /* A trusted caller has used -f but not -F */
4618 else originator_name = US"";
4621 /* Break the retry loop */
4626 if (++i > finduser_retries) break;
4630 /* If we cannot get a user login, log the incident and give up, unless the
4631 configuration specifies something to use. When running in the test harness,
4632 any setting of unknown_login overrides the actual name. */
4634 if (originator_login == NULL || running_in_test_harness)
4636 if (unknown_login != NULL)
4638 originator_login = expand_string(unknown_login);
4639 if (originator_name == NULL && unknown_username != NULL)
4640 originator_name = expand_string(unknown_username);
4641 if (originator_name == NULL) originator_name = US"";
4643 if (originator_login == NULL)
4644 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4648 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4651 originator_name = string_copy(parse_fix_phrase(originator_name,
4652 Ustrlen(originator_name), big_buffer, big_buffer_size));
4654 /* If a message is created by this call of Exim, the uid/gid of its originator
4655 are those of the caller. These values are overridden if an existing message is
4656 read in from the spool. */
4658 originator_uid = real_uid;
4659 originator_gid = real_gid;
4661 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4662 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4664 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4665 returns. We leave this till here so that the originator_ fields are available
4666 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4669 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4673 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4674 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4675 "mua_wrapper is set");
4680 /* If the sender ident has not been set (by a trusted caller) set it to
4681 the caller. This will get overwritten below for an inetd call. If a trusted
4682 caller has set it empty, unset it. */
4684 if (sender_ident == NULL) sender_ident = originator_login;
4685 else if (sender_ident[0] == 0) sender_ident = NULL;
4687 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4688 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4689 originator_* variables set. */
4691 if (test_rewrite_arg >= 0)
4693 really_exim = FALSE;
4694 if (test_rewrite_arg >= argc)
4696 printf("-brw needs an address argument\n");
4697 exim_exit(EXIT_FAILURE);
4699 rewrite_test(argv[test_rewrite_arg]);
4700 exim_exit(EXIT_SUCCESS);
4703 /* A locally-supplied message is considered to be coming from a local user
4704 unless a trusted caller supplies a sender address with -f, or is passing in the
4705 message via SMTP (inetd invocation or otherwise). */
4707 if ((sender_address == NULL && !smtp_input) ||
4708 (!trusted_caller && filter_test == FTEST_NONE))
4710 sender_local = TRUE;
4712 /* A trusted caller can supply authenticated_sender and authenticated_id
4713 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4714 defaults except when host checking. */
4716 if (authenticated_sender == NULL && !host_checking)
4717 authenticated_sender = string_sprintf("%s@%s", originator_login,
4718 qualify_domain_sender);
4719 if (authenticated_id == NULL && !host_checking)
4720 authenticated_id = originator_login;
4723 /* Trusted callers are always permitted to specify the sender address.
4724 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4725 is specified is the empty address. However, if a trusted caller does not
4726 specify a sender address for SMTP input, we leave sender_address unset. This
4727 causes the MAIL commands to be honoured. */
4729 if ((!smtp_input && sender_address == NULL) ||
4730 !receive_check_set_sender(sender_address))
4732 /* Either the caller is not permitted to set a general sender, or this is
4733 non-SMTP input and the trusted caller has not set a sender. If there is no
4734 sender, or if a sender other than <> is set, override with the originator's
4735 login (which will get qualified below), except when checking things. */
4737 if (sender_address == NULL /* No sender_address set */
4739 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4740 !checking && /* Not running tests, AND */
4741 filter_test == FTEST_NONE)) /* Not testing a filter */
4743 sender_address = originator_login;
4744 sender_address_forced = FALSE;
4745 sender_address_domain = 0;
4749 /* Remember whether an untrusted caller set the sender address */
4751 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4753 /* Ensure that the sender address is fully qualified unless it is the empty
4754 address, which indicates an error message, or doesn't exist (root caller, smtp
4755 interface, no -f argument). */
4757 if (sender_address != NULL && sender_address[0] != 0 &&
4758 sender_address_domain == 0)
4759 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4760 qualify_domain_sender);
4762 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4764 /* Handle a request to verify a list of addresses, or test them for delivery.
4765 This must follow the setting of the sender address, since routers can be
4766 predicated upon the sender. If no arguments are given, read addresses from
4767 stdin. Set debug_level to at least D_v to get full output for address testing.
4770 if (verify_address_mode || address_test_mode)
4773 int flags = vopt_qualify;
4775 if (verify_address_mode)
4777 if (!verify_as_sender) flags |= vopt_is_recipient;
4778 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4783 flags |= vopt_is_recipient;
4784 debug_selector |= D_v;
4785 debug_file = stderr;
4786 debug_fd = fileno(debug_file);
4787 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4790 if (recipients_arg < argc)
4792 while (recipients_arg < argc)
4794 uschar *s = argv[recipients_arg++];
4797 BOOL finished = FALSE;
4798 uschar *ss = parse_find_address_end(s, FALSE);
4799 if (*ss == ',') *ss = 0; else finished = TRUE;
4800 test_address(s, flags, &exit_value);
4803 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4810 uschar *s = get_stdinput(NULL, NULL);
4811 if (s == NULL) break;
4812 test_address(s, flags, &exit_value);
4816 exim_exit(exit_value);
4819 /* Handle expansion checking. Either expand items on the command line, or read
4820 from stdin if there aren't any. If -Mset was specified, load the message so
4821 that its variables can be used, but restrict this facility to admin users.
4822 Otherwise, if -bem was used, read a message from stdin. */
4826 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4828 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4831 fprintf(stderr, "exim: permission denied\n");
4834 message_id = argv[msg_action_arg];
4835 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4836 if (!spool_open_datafile(message_id))
4837 printf ("Failed to load message datafile %s\n", message_id);
4838 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4839 printf ("Failed to load message %s\n", message_id);
4842 /* Read a test message from a file. We fudge it up to be on stdin, saving
4843 stdin itself for later reading of expansion strings. */
4845 else if (expansion_test_message != NULL)
4847 int save_stdin = dup(0);
4848 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4851 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4853 return EXIT_FAILURE;
4856 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4857 message_ended = END_NOTENDED;
4858 read_message_body(receive_msg(extract_recipients));
4859 message_linecount += body_linecount;
4860 (void)dup2(save_stdin, 0);
4861 (void)close(save_stdin);
4862 clearerr(stdin); /* Required by Darwin */
4865 /* Allow $recipients for this testing */
4867 enable_dollar_recipients = TRUE;
4869 /* Expand command line items */
4871 if (recipients_arg < argc)
4873 while (recipients_arg < argc)
4875 uschar *s = argv[recipients_arg++];
4876 uschar *ss = expand_string(s);
4877 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4878 else printf("%s\n", CS ss);
4886 char *(*fn_readline)(const char *) = NULL;
4887 void (*fn_addhist)(const char *) = NULL;
4890 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4896 uschar *source = get_stdinput(fn_readline, fn_addhist);
4897 if (source == NULL) break;
4898 ss = expand_string(source);
4900 printf ("Failed: %s\n", expand_string_message);
4901 else printf("%s\n", CS ss);
4905 if (dlhandle != NULL) dlclose(dlhandle);
4909 /* The data file will be open after -Mset */
4911 if (deliver_datafile >= 0)
4913 (void)close(deliver_datafile);
4914 deliver_datafile = -1;
4917 exim_exit(EXIT_SUCCESS);
4921 /* The active host name is normally the primary host name, but it can be varied
4922 for hosts that want to play several parts at once. We need to ensure that it is
4923 set for host checking, and for receiving messages. */
4925 smtp_active_hostname = primary_hostname;
4926 if (raw_active_hostname != NULL)
4928 uschar *nah = expand_string(raw_active_hostname);
4931 if (!expand_string_forcedfail)
4932 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4933 "(smtp_active_hostname): %s", raw_active_hostname,
4934 expand_string_message);
4936 else if (nah[0] != 0) smtp_active_hostname = nah;
4939 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4940 given IP address so that the blocking and relay configuration can be tested.
4941 Unless a sender_ident was set by -oMt, we discard it (the default is the
4942 caller's login name). An RFC 1413 call is made only if we are running in the
4943 test harness and an incoming interface and both ports are specified, because
4944 there is no TCP/IP call to find the ident for. */
4951 if (!sender_ident_set)
4953 sender_ident = NULL;
4954 if (running_in_test_harness && sender_host_port != 0 &&
4955 interface_address != NULL && interface_port != 0)
4956 verify_get_ident(1413);
4959 /* In case the given address is a non-canonical IPv6 address, canonicize
4960 it. The code works for both IPv4 and IPv6, as it happens. */
4962 size = host_aton(sender_host_address, x);
4963 sender_host_address = store_get(48); /* large enough for full IPv6 */
4964 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4966 /* Now set up for testing */
4968 host_build_sender_fullhost();
4972 sender_local = FALSE;
4973 sender_host_notsocket = TRUE;
4974 debug_file = stderr;
4975 debug_fd = fileno(debug_file);
4976 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4977 "**** but without any ident (RFC 1413) callback.\n"
4978 "**** This is not for real!\n\n",
4979 sender_host_address);
4981 if (verify_check_host(&hosts_connection_nolog) == OK)
4982 log_write_selector &= ~L_smtp_connection;
4983 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4985 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4986 because a log line has already been written for all its failure exists
4987 (usually "connection refused: <reason>") and writing another one is
4988 unnecessary clutter. */
4990 if (smtp_start_session())
4992 reset_point = store_get(0);
4995 store_reset(reset_point);
4996 if (smtp_setup_msg() <= 0) break;
4997 if (!receive_msg(FALSE)) break;
5001 exim_exit(EXIT_SUCCESS);
5005 /* Arrange for message reception if recipients or SMTP were specified;
5006 otherwise complain unless a version print (-bV) happened or this is a filter
5007 verification test or info dump.
5008 In the former case, show the configuration file name. */
5010 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5012 if (version_printed)
5014 printf("Configuration file is %s\n", config_main_filename);
5015 return EXIT_SUCCESS;
5018 if (info_flag != CMDINFO_NONE)
5020 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5021 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5024 if (filter_test == FTEST_NONE)
5025 exim_usage(called_as);
5029 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5030 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5031 that we are not called from inetd, because that is rejected above. The
5032 following configuration settings are forced here:
5034 (1) Synchronous delivery (-odi)
5035 (2) Errors to stderr (-oep == -oeq)
5036 (3) No parallel remote delivery
5037 (4) Unprivileged delivery
5039 We don't force overall queueing options because there are several of them;
5040 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5041 to override any SMTP queueing. */
5045 synchronous_delivery = TRUE;
5046 arg_error_handling = ERRORS_STDERR;
5047 remote_max_parallel = 1;
5048 deliver_drop_privilege = TRUE;
5050 queue_smtp_domains = NULL;
5054 /* Prepare to accept one or more new messages on the standard input. When a
5055 message has been read, its id is returned in message_id[]. If doing immediate
5056 delivery, we fork a delivery process for each received message, except for the
5057 last one, where we can save a process switch.
5059 It is only in non-smtp mode that error_handling is allowed to be changed from
5060 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5061 sendmail error modes other than -oem ever actually used? Later: yes.) */
5063 if (!smtp_input) error_handling = arg_error_handling;
5065 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5066 logging being sent down the socket and make an identd call to get the
5071 (void)fclose(stderr);
5072 exim_nullstd(); /* Re-open to /dev/null */
5073 verify_get_ident(IDENT_PORT);
5074 host_build_sender_fullhost();
5075 set_process_info("handling incoming connection from %s via inetd",
5079 /* If the sender host address has been set, build sender_fullhost if it hasn't
5080 already been done (which it will have been for inetd). This caters for the
5081 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5082 so that the test for IP options is skipped for -bs input. */
5084 if (sender_host_address != NULL && sender_fullhost == NULL)
5086 host_build_sender_fullhost();
5087 set_process_info("handling incoming connection from %s via -oMa",
5089 sender_host_notsocket = TRUE;
5092 /* Otherwise, set the sender host as unknown except for inetd calls. This
5093 prevents host checking in the case of -bs not from inetd and also for -bS. */
5095 else if (!is_inetd) sender_host_unknown = TRUE;
5097 /* If stdout does not exist, then dup stdin to stdout. This can happen
5098 if exim is started from inetd. In this case fd 0 will be set to the socket,
5099 but fd 1 will not be set. This also happens for passed SMTP channels. */
5101 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5103 /* Set up the incoming protocol name and the state of the program. Root is
5104 allowed to force received protocol via the -oMr option above. If we have come
5105 via inetd, the process info has already been set up. We don't set
5106 received_protocol here for smtp input, as it varies according to
5107 batch/HELO/EHLO/AUTH/TLS. */
5111 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5112 smtp_batched_input? "batched " : "",
5113 (sender_address!= NULL)? sender_address : originator_login);
5117 if (received_protocol == NULL)
5118 received_protocol = string_sprintf("local%s", called_as);
5119 set_process_info("accepting a local non-SMTP message from <%s>",
5123 /* Initialize the session_local_queue-only flag (this will be ignored if
5124 mua_wrapper is set) */
5127 session_local_queue_only = queue_only;
5129 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5130 the spool if so configured. On failure, we must not attempt to send an error
5131 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5132 error code is given.) */
5134 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5136 fprintf(stderr, "exim: insufficient disk space\n");
5137 return EXIT_FAILURE;
5140 /* If this is smtp input of any kind, real or batched, handle the start of the
5143 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5144 because a log line has already been written for all its failure exists
5145 (usually "connection refused: <reason>") and writing another one is
5146 unnecessary clutter. */
5152 if (verify_check_host(&hosts_connection_nolog) == OK)
5153 log_write_selector &= ~L_smtp_connection;
5154 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5155 if (!smtp_start_session())
5158 exim_exit(EXIT_SUCCESS);
5162 /* Otherwise, set up the input size limit here. */
5166 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5167 if (expand_string_message != NULL)
5169 if (thismessage_size_limit == -1)
5170 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5171 "message_size_limit: %s", expand_string_message);
5173 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5174 "message_size_limit: %s", expand_string_message);
5178 /* Loop for several messages when reading SMTP input. If we fork any child
5179 processes, we don't want to wait for them unless synchronous delivery is
5180 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5181 same as SIG_DFL, despite the fact that documentation often lists the default as
5182 "ignore". This is a confusing area. This is what I know:
5184 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5185 processes that complete simply to go away without ever becoming defunct. You
5186 can't then wait for them - but we don't want to wait for them in the
5187 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5188 happen for all OS (e.g. *BSD is different).
5190 But that's not the end of the story. Some (many? all?) systems have the
5191 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5192 has by default, so it seems that the difference is merely one of default
5193 (compare restarting vs non-restarting signals).
5195 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5196 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5197 of the loop below. Paranoia rules.
5199 February 2003: That's *still* not the end of the story. There are now versions
5200 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5201 process then calls waitpid(), a grumble is written to the system log, because
5202 this is logically inconsistent. In other words, it doesn't like the paranoia.
5203 As a consequenc of this, the waitpid() below is now excluded if we are sure
5204 that SIG_IGN works. */
5206 if (!synchronous_delivery)
5209 struct sigaction act;
5210 act.sa_handler = SIG_IGN;
5211 sigemptyset(&(act.sa_mask));
5212 act.sa_flags = SA_NOCLDWAIT;
5213 sigaction(SIGCHLD, &act, NULL);
5215 signal(SIGCHLD, SIG_IGN);
5219 /* Save the current store pool point, for resetting at the start of
5220 each message, and save the real sender address, if any. */
5222 reset_point = store_get(0);
5223 real_sender_address = sender_address;
5225 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5226 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5231 store_reset(reset_point);
5234 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5235 input and build the recipients list, before calling receive_msg() to read the
5236 message proper. Whatever sender address is given in the SMTP transaction is
5237 often ignored for local senders - we use the actual sender, which is normally
5238 either the underlying user running this process or a -f argument provided by
5239 a trusted caller. It is saved in real_sender_address. The test for whether to
5240 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5245 if ((rc = smtp_setup_msg()) > 0)
5247 if (real_sender_address != NULL &&
5248 !receive_check_set_sender(sender_address))
5250 sender_address = raw_sender = real_sender_address;
5251 sender_address_unrewritten = NULL;
5254 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5255 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5256 the very end. The result of the ACL is ignored (as for other non-SMTP
5257 messages). It is run for its potential side effects. */
5259 if (smtp_batched_input && acl_not_smtp_start != NULL)
5261 uschar *user_msg, *log_msg;
5262 enable_dollar_recipients = TRUE;
5263 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5264 &user_msg, &log_msg);
5265 enable_dollar_recipients = FALSE;
5268 /* Now get the data for the message */
5270 more = receive_msg(extract_recipients);
5271 if (message_id[0] == 0)
5274 smtp_log_no_mail(); /* Log no mail if configured */
5275 exim_exit(EXIT_FAILURE);
5280 smtp_log_no_mail(); /* Log no mail if configured */
5281 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5285 /* In the non-SMTP case, we have all the information from the command
5286 line, but must process it in case it is in the more general RFC822
5287 format, and in any case, to detect syntax errors. Also, it appears that
5288 the use of comma-separated lists as single arguments is common, so we
5289 had better support them. */
5295 int count = argc - recipients_arg;
5296 uschar **list = argv + recipients_arg;
5298 /* These options cannot be changed dynamically for non-SMTP messages */
5300 active_local_sender_retain = local_sender_retain;
5301 active_local_from_check = local_from_check;
5303 /* Save before any rewriting */
5305 raw_sender = string_copy(sender_address);
5307 /* Loop for each argument */
5309 for (i = 0; i < count; i++)
5311 int start, end, domain;
5313 uschar *s = list[i];
5315 /* Loop for each comma-separated address */
5319 BOOL finished = FALSE;
5321 uschar *ss = parse_find_address_end(s, FALSE);
5323 if (*ss == ',') *ss = 0; else finished = TRUE;
5325 /* Check max recipients - if -t was used, these aren't recipients */
5327 if (recipients_max > 0 && ++rcount > recipients_max &&
5328 !extract_recipients)
5330 if (error_handling == ERRORS_STDERR)
5332 fprintf(stderr, "exim: too many recipients\n");
5333 exim_exit(EXIT_FAILURE);
5338 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5339 errors_sender_rc : EXIT_FAILURE;
5344 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5346 if (domain == 0 && !allow_unqualified_recipient)
5349 errmess = US"unqualified recipient address not allowed";
5352 if (recipient == NULL)
5354 if (error_handling == ERRORS_STDERR)
5356 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5357 string_printing(list[i]), errmess);
5358 exim_exit(EXIT_FAILURE);
5364 eblock.text1 = string_printing(list[i]);
5365 eblock.text2 = errmess;
5367 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5368 errors_sender_rc : EXIT_FAILURE;
5372 receive_add_recipient(recipient, -1);
5375 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5379 /* Show the recipients when debugging */
5384 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5385 if (recipients_list != NULL)
5387 debug_printf("Recipients:\n");
5388 for (i = 0; i < recipients_count; i++)
5389 debug_printf(" %s\n", recipients_list[i].address);
5393 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5394 ignored; rejecting here would just add complication, and it can just as
5395 well be done later. Allow $recipients to be visible in the ACL. */
5397 if (acl_not_smtp_start != NULL)
5399 uschar *user_msg, *log_msg;
5400 enable_dollar_recipients = TRUE;
5401 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5402 &user_msg, &log_msg);
5403 enable_dollar_recipients = FALSE;
5406 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5407 will just read the headers for the message, and not write anything onto the
5410 message_ended = END_NOTENDED;
5411 more = receive_msg(extract_recipients);
5413 /* more is always FALSE here (not SMTP message) when reading a message
5414 for real; when reading the headers of a message for filter testing,
5415 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5417 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5418 } /* Non-SMTP message reception */
5420 /* If this is a filter testing run, there are headers in store, but
5421 no message on the spool. Run the filtering code in testing mode, setting
5422 the domain to the qualify domain and the local part to the current user,
5423 unless they have been set by options. The prefix and suffix are left unset
5424 unless specified. The the return path is set to to the sender unless it has
5425 already been set from a return-path header in the message. */
5427 if (filter_test != FTEST_NONE)
5429 deliver_domain = (ftest_domain != NULL)?
5430 ftest_domain : qualify_domain_recipient;
5431 deliver_domain_orig = deliver_domain;
5432 deliver_localpart = (ftest_localpart != NULL)?
5433 ftest_localpart : originator_login;
5434 deliver_localpart_orig = deliver_localpart;
5435 deliver_localpart_prefix = ftest_prefix;
5436 deliver_localpart_suffix = ftest_suffix;
5437 deliver_home = originator_home;
5439 if (return_path == NULL)
5441 printf("Return-path copied from sender\n");
5442 return_path = string_copy(sender_address);
5446 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5448 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5450 receive_add_recipient(
5451 string_sprintf("%s%s%s@%s",
5452 (ftest_prefix == NULL)? US"" : ftest_prefix,
5454 (ftest_suffix == NULL)? US"" : ftest_suffix,
5455 deliver_domain), -1);
5457 printf("Recipient = %s\n", recipients_list[0].address);
5458 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5459 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5461 if (chdir("/")) /* Get away from wherever the user is running this from */
5463 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5464 exim_exit(EXIT_FAILURE);
5467 /* Now we run either a system filter test, or a user filter test, or both.
5468 In the latter case, headers added by the system filter will persist and be
5469 available to the user filter. We need to copy the filter variables
5472 if ((filter_test & FTEST_SYSTEM) != 0)
5474 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5475 exim_exit(EXIT_FAILURE);
5478 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5480 if ((filter_test & FTEST_USER) != 0)
5482 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5483 exim_exit(EXIT_FAILURE);
5486 exim_exit(EXIT_SUCCESS);
5489 /* Else act on the result of message reception. We should not get here unless
5490 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5491 will be TRUE. If it is not, check on the number of messages received in this
5494 if (!session_local_queue_only &&
5495 smtp_accept_queue_per_connection > 0 &&
5496 receive_messagecount > smtp_accept_queue_per_connection)
5498 session_local_queue_only = TRUE;
5499 queue_only_reason = 2;
5502 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5503 and queue_only_load is set, check that the load average is below it. If it is
5504 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5505 default), we put the whole session into queue_only mode. It then remains this
5506 way for any subsequent messages on the same SMTP connection. This is a
5507 deliberate choice; even though the load average may fall, it doesn't seem
5508 right to deliver later messages on the same call when not delivering earlier
5509 ones. However, there are odd cases where this is not wanted, so this can be
5510 changed by setting queue_only_load_latch false. */
5512 local_queue_only = session_local_queue_only;
5513 if (!local_queue_only && queue_only_load >= 0)
5515 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5516 if (local_queue_only)
5518 queue_only_reason = 3;
5519 if (queue_only_load_latch) session_local_queue_only = TRUE;
5523 /* If running as an MUA wrapper, all queueing options and freezing options
5527 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5529 /* Log the queueing here, when it will get a message id attached, but
5530 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5533 if (local_queue_only) switch(queue_only_reason)
5536 log_write(L_delay_delivery,
5537 LOG_MAIN, "no immediate delivery: more than %d messages "
5538 "received in one connection", smtp_accept_queue_per_connection);
5542 log_write(L_delay_delivery,
5543 LOG_MAIN, "no immediate delivery: load average %.2f",
5544 (double)load_average/1000.0);
5548 /* Else do the delivery unless the ACL or local_scan() called for queue only
5549 or froze the message. Always deliver in a separate process. A fork failure is
5550 not a disaster, as the delivery will eventually happen on a subsequent queue
5551 run. The search cache must be tidied before the fork, as the parent will
5552 do it before exiting. The child will trigger a lookup failure and
5553 thereby defer the delivery if it tries to use (for example) a cached ldap
5554 connection that the parent has called unbind on. */
5556 else if (!queue_only_policy && !deliver_freeze)
5561 if ((pid = fork()) == 0)
5564 close_unwanted(); /* Close unwanted file descriptors and TLS */
5565 exim_nullstd(); /* Ensure std{in,out,err} exist */
5567 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5568 mode, deliver_drop_privilege is forced TRUE). */
5570 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5572 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5574 /* Control does not return here. */
5577 /* No need to re-exec */
5579 rc = deliver_message(message_id, FALSE, FALSE);
5581 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5582 EXIT_SUCCESS : EXIT_FAILURE);
5587 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5588 "process: %s", strerror(errno));
5591 /* In the parent, wait if synchronous delivery is required. This will
5592 always be the case in MUA wrapper mode. */
5594 else if (synchronous_delivery)
5597 while (wait(&status) != pid);
5598 if ((status & 0x00ff) != 0)
5599 log_write(0, LOG_MAIN|LOG_PANIC,
5600 "process %d crashed with signal %d while delivering %s",
5601 (int)pid, status & 0x00ff, message_id);
5602 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5606 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5607 automatically reaps children (see comments above the loop), clear away any
5608 finished subprocesses here, in case there are lots of messages coming in
5609 from the same source. */
5611 #ifndef SIG_IGN_WORKS
5612 while (waitpid(-1, NULL, WNOHANG) > 0);
5616 exim_exit(EXIT_SUCCESS); /* Never returns */
5617 return 0; /* To stop compiler warning */