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. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
136 int ovector[3*(EXPAND_MAXN+1)];
137 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
138 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
140 if (n == 0) n = EXPAND_MAXN + 1;
144 expand_nmax = (setup < 0)? 0 : setup + 1;
145 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
147 expand_nstring[expand_nmax] = subject + ovector[nn];
148 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
158 /*************************************************
159 * Set up processing details *
160 *************************************************/
162 /* Save a text string for dumping when SIGUSR1 is received.
163 Do checks for overruns.
165 Arguments: format and arguments, as for printf()
170 set_process_info(const char *format, ...)
174 sprintf(CS process_info, "%5d ", (int)getpid());
175 len = Ustrlen(process_info);
176 va_start(ap, format);
177 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
178 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
179 len = Ustrlen(process_info);
180 process_info[len+0] = '\n';
181 process_info[len+1] = '\0';
182 process_info_len = len + 1;
183 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
190 /*************************************************
191 * Handler for SIGUSR1 *
192 *************************************************/
194 /* SIGUSR1 causes any exim process to write to the process log details of
195 what it is currently doing. It will only be used if the OS is capable of
196 setting up a handler that causes automatic restarting of any system call
197 that is in progress at the time.
199 This function takes care to be signal-safe.
201 Argument: the signal number (SIGUSR1)
206 usr1_handler(int sig)
210 os_restarting_signal(sig, usr1_handler);
212 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
215 /* If we are already running as the Exim user, try to create it in the
216 current process (assuming spool_directory exists). Otherwise, if we are
217 root, do the creation in an exim:exim subprocess. */
219 int euid = geteuid();
220 if (euid == exim_uid)
221 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
222 else if (euid == root_uid)
223 fd = log_create_as_exim(process_log_path);
226 /* If we are neither exim nor root, or if we failed to create the log file,
227 give up. There is not much useful we can do with errors, since we don't want
228 to disrupt whatever is going on outside the signal handler. */
232 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
238 /*************************************************
240 *************************************************/
242 /* This handler is enabled most of the time that Exim is running. The handler
243 doesn't actually get used unless alarm() has been called to set a timer, to
244 place a time limit on a system call of some kind. When the handler is run, it
247 There are some other SIGALRM handlers that are used in special cases when more
248 than just a flag setting is required; for example, when reading a message's
249 input. These are normally set up in the code module that uses them, and the
250 SIGALRM handler is reset to this one afterwards.
252 Argument: the signal value (SIGALRM)
257 sigalrm_handler(int sig)
259 sig = sig; /* Keep picky compilers happy */
261 os_non_restarting_signal(SIGALRM, sigalrm_handler);
266 /*************************************************
267 * Sleep for a fractional time interval *
268 *************************************************/
270 /* This function is called by millisleep() and exim_wait_tick() to wait for a
271 period of time that may include a fraction of a second. The coding is somewhat
272 tedious. We do not expect setitimer() ever to fail, but if it does, the process
273 will wait for ever, so we panic in this instance. (There was a case of this
274 when a bug in a function that calls milliwait() caused it to pass invalid data.
275 That's when I added the check. :-)
277 We assume it to be not worth sleeping for under 100us; this value will
278 require revisiting as hardware advances. This avoids the issue of
279 a zero-valued timer setting meaning "never fire".
281 Argument: an itimerval structure containing the interval
286 milliwait(struct itimerval *itval)
289 sigset_t old_sigmask;
291 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
293 (void)sigemptyset(&sigmask); /* Empty mask */
294 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
295 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
296 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
297 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
298 "setitimer() failed: %s", strerror(errno));
299 (void)sigfillset(&sigmask); /* All signals */
300 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
301 (void)sigsuspend(&sigmask); /* Until SIGALRM */
302 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
308 /*************************************************
309 * Millisecond sleep function *
310 *************************************************/
312 /* The basic sleep() function has a granularity of 1 second, which is too rough
313 in some cases - for example, when using an increasing delay to slow down
316 Argument: number of millseconds
323 struct itimerval itval;
324 itval.it_interval.tv_sec = 0;
325 itval.it_interval.tv_usec = 0;
326 itval.it_value.tv_sec = msec/1000;
327 itval.it_value.tv_usec = (msec % 1000) * 1000;
333 /*************************************************
334 * Compare microsecond times *
335 *************************************************/
342 Returns: -1, 0, or +1
346 exim_tvcmp(struct timeval *t1, struct timeval *t2)
348 if (t1->tv_sec > t2->tv_sec) return +1;
349 if (t1->tv_sec < t2->tv_sec) return -1;
350 if (t1->tv_usec > t2->tv_usec) return +1;
351 if (t1->tv_usec < t2->tv_usec) return -1;
358 /*************************************************
359 * Clock tick wait function *
360 *************************************************/
362 /* Exim uses a time + a pid to generate a unique identifier in two places: its
363 message IDs, and in file names for maildir deliveries. Because some OS now
364 re-use pids within the same second, sub-second times are now being used.
365 However, for absolute certaintly, we must ensure the clock has ticked before
366 allowing the relevant process to complete. At the time of implementation of
367 this code (February 2003), the speed of processors is such that the clock will
368 invariably have ticked already by the time a process has done its job. This
369 function prepares for the time when things are faster - and it also copes with
370 clocks that go backwards.
373 then_tv A timeval which was used to create uniqueness; its usec field
374 has been rounded down to the value of the resolution.
375 We want to be sure the current time is greater than this.
376 resolution The resolution that was used to divide the microseconds
377 (1 for maildir, larger for message ids)
383 exim_wait_tick(struct timeval *then_tv, int resolution)
385 struct timeval now_tv;
386 long int now_true_usec;
388 (void)gettimeofday(&now_tv, NULL);
389 now_true_usec = now_tv.tv_usec;
390 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
392 if (exim_tvcmp(&now_tv, then_tv) <= 0)
394 struct itimerval itval;
395 itval.it_interval.tv_sec = 0;
396 itval.it_interval.tv_usec = 0;
397 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
398 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
400 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
401 negative value for the microseconds is possible only in the case when "now"
402 is more than a second less than "then". That means that itval.it_value.tv_sec
403 is greater than zero. The following correction is therefore safe. */
405 if (itval.it_value.tv_usec < 0)
407 itval.it_value.tv_usec += 1000000;
408 itval.it_value.tv_sec -= 1;
411 DEBUG(D_transport|D_receive)
413 if (!running_in_test_harness)
415 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
416 then_tv->tv_sec, (long) then_tv->tv_usec,
417 now_tv.tv_sec, (long) now_tv.tv_usec);
418 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
419 (long) itval.it_value.tv_usec);
430 /*************************************************
431 * Call fopen() with umask 777 and adjust mode *
432 *************************************************/
434 /* Exim runs with umask(0) so that files created with open() have the mode that
435 is specified in the open() call. However, there are some files, typically in
436 the spool directory, that are created with fopen(). They end up world-writeable
437 if no precautions are taken. Although the spool directory is not accessible to
438 the world, this is an untidiness. So this is a wrapper function for fopen()
439 that sorts out the mode of the created file.
442 filename the file name
443 options the fopen() options
444 mode the required mode
446 Returns: the fopened FILE or NULL
450 modefopen(const uschar *filename, const char *options, mode_t mode)
452 mode_t saved_umask = umask(0777);
453 FILE *f = Ufopen(filename, options);
454 (void)umask(saved_umask);
455 if (f != NULL) (void)fchmod(fileno(f), mode);
462 /*************************************************
463 * Ensure stdin, stdout, and stderr exist *
464 *************************************************/
466 /* Some operating systems grumble if an exec() happens without a standard
467 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
468 file will be opened and will use these fd values, and then some other bit of
469 code will assume, for example, that it can write error messages to stderr.
470 This function ensures that fds 0, 1, and 2 are open if they do not already
471 exist, by connecting them to /dev/null.
473 This function is also used to ensure that std{in,out,err} exist at all times,
474 so that if any library that Exim calls tries to use them, it doesn't crash.
486 for (i = 0; i <= 2; i++)
488 if (fstat(i, &statbuf) < 0 && errno == EBADF)
490 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
491 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
492 string_open_failed(errno, "/dev/null"));
493 if (devnull != i) (void)dup2(devnull, i);
496 if (devnull > 2) (void)close(devnull);
502 /*************************************************
503 * Close unwanted file descriptors for delivery *
504 *************************************************/
506 /* This function is called from a new process that has been forked to deliver
507 an incoming message, either directly, or using exec.
509 We want any smtp input streams to be closed in this new process. However, it
510 has been observed that using fclose() here causes trouble. When reading in -bS
511 input, duplicate copies of messages have been seen. The files will be sharing a
512 file pointer with the parent process, and it seems that fclose() (at least on
513 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
514 least sometimes. Hence we go for closing the underlying file descriptors.
516 If TLS is active, we want to shut down the TLS library, but without molesting
517 the parent's SSL connection.
519 For delivery of a non-SMTP message, we want to close stdin and stdout (and
520 stderr unless debugging) because the calling process might have set them up as
521 pipes and be waiting for them to close before it waits for the submission
522 process to terminate. If they aren't closed, they hold up the calling process
523 until the initial delivery process finishes, which is not what we want.
525 Exception: We do want it for synchronous delivery!
527 And notwithstanding all the above, if D_resolver is set, implying resolver
528 debugging, leave stdout open, because that's where the resolver writes its
531 When we close stderr (which implies we've also closed stdout), we also get rid
532 of any controlling terminal.
544 tls_close(TRUE, FALSE); /* Shut down the TLS library */
546 (void)close(fileno(smtp_in));
547 (void)close(fileno(smtp_out));
552 (void)close(0); /* stdin */
553 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
554 if (debug_selector == 0) /* stderr */
556 if (!synchronous_delivery)
569 /*************************************************
571 *************************************************/
573 /* This function sets a new uid and gid permanently, optionally calling
574 initgroups() to set auxiliary groups. There are some special cases when running
575 Exim in unprivileged modes. In these situations the effective uid will not be
576 root; if we already have the right effective uid/gid, and don't need to
577 initialize any groups, leave things as they are.
582 igflag TRUE if initgroups() wanted
583 msg text to use in debugging output and failure log
585 Returns: nothing; bombs out on failure
589 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
591 uid_t euid = geteuid();
592 gid_t egid = getegid();
594 if (euid == root_uid || euid != uid || egid != gid || igflag)
596 /* At least one OS returns +1 for initgroups failure, so just check for
601 struct passwd *pw = getpwuid(uid);
604 if (initgroups(pw->pw_name, gid) != 0)
605 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
606 (long int)uid, strerror(errno));
608 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
609 "no passwd entry for uid=%ld", (long int)uid);
612 if (setgid(gid) < 0 || setuid(uid) < 0)
614 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
615 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
619 /* Debugging output included uid/gid and all groups */
623 int group_count, save_errno;
624 gid_t group_list[NGROUPS_MAX];
625 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
626 (long int)geteuid(), (long int)getegid(), (long int)getpid());
627 group_count = getgroups(NGROUPS_MAX, group_list);
629 debug_printf(" auxiliary group list:");
633 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
635 else if (group_count < 0)
636 debug_printf(" <error: %s>", strerror(save_errno));
637 else debug_printf(" <none>");
645 /*************************************************
647 *************************************************/
649 /* Exim exits via this function so that it always clears up any open
655 Returns: does not return
663 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
664 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
671 /*************************************************
672 * Extract port from host address *
673 *************************************************/
675 /* Called to extract the port from the values given to -oMa and -oMi.
676 It also checks the syntax of the address, and terminates it before the
677 port data when a port is extracted.
680 address the address, with possible port on the end
682 Returns: the port, or zero if there isn't one
683 bombs out on a syntax error
687 check_port(uschar *address)
689 int port = host_address_extract_port(address);
690 if (string_is_ip_address(address, NULL) == 0)
692 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
700 /*************************************************
701 * Test/verify an address *
702 *************************************************/
704 /* This function is called by the -bv and -bt code. It extracts a working
705 address from a full RFC 822 address. This isn't really necessary per se, but it
706 has the effect of collapsing source routes.
710 flags flag bits for verify_address()
711 exit_value to be set for failures
717 test_address(uschar *s, int flags, int *exit_value)
719 int start, end, domain;
720 uschar *parse_error = NULL;
721 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
725 fprintf(stdout, "syntax error: %s\n", parse_error);
730 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
731 -1, -1, NULL, NULL, NULL);
732 if (rc == FAIL) *exit_value = 2;
733 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
739 /*************************************************
740 * Show supported features *
741 *************************************************/
743 /* This function is called for -bV/--version and for -d to output the optional
744 features of the current Exim binary.
746 Arguments: a FILE for printing
751 show_whats_supported(FILE *f)
755 #ifdef DB_VERSION_STRING
756 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
757 #elif defined(BTREEVERSION) && defined(HASHVERSION)
759 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
761 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
763 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
764 fprintf(f, "Probably ndbm\n");
765 #elif defined(USE_TDB)
766 fprintf(f, "Using tdb\n");
769 fprintf(f, "Probably GDBM (native mode)\n");
771 fprintf(f, "Probably GDBM (compatibility mode)\n");
775 fprintf(f, "Support for:");
776 #ifdef SUPPORT_CRYPTEQ
777 fprintf(f, " crypteq");
780 fprintf(f, " iconv()");
785 #ifdef HAVE_SETCLASSRESOURCES
786 fprintf(f, " use_setclassresources");
795 fprintf(f, " Expand_dlfunc");
797 #ifdef USE_TCP_WRAPPERS
798 fprintf(f, " TCPwrappers");
802 fprintf(f, " GnuTLS");
804 fprintf(f, " OpenSSL");
807 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
808 fprintf(f, " translate_ip_address");
810 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
811 fprintf(f, " move_frozen_messages");
813 #ifdef WITH_CONTENT_SCAN
814 fprintf(f, " Content_Scanning");
819 #ifdef WITH_OLD_DEMIME
820 fprintf(f, " Old_Demime");
828 #ifdef EXPERIMENTAL_SPF
829 fprintf(f, " Experimental_SPF");
831 #ifdef EXPERIMENTAL_SRS
832 fprintf(f, " Experimental_SRS");
834 #ifdef EXPERIMENTAL_BRIGHTMAIL
835 fprintf(f, " Experimental_Brightmail");
837 #ifdef EXPERIMENTAL_DANE
838 fprintf(f, " Experimental_DANE");
840 #ifdef EXPERIMENTAL_DCC
841 fprintf(f, " Experimental_DCC");
843 #ifdef EXPERIMENTAL_DMARC
844 fprintf(f, " Experimental_DMARC");
846 #ifdef EXPERIMENTAL_PROXY
847 fprintf(f, " Experimental_Proxy");
849 #ifdef EXPERIMENTAL_EVENT
850 fprintf(f, " Experimental_Event");
852 #ifdef EXPERIMENTAL_REDIS
853 fprintf(f, " Experimental_Redis");
857 fprintf(f, "Lookups (built-in):");
858 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
859 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
861 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
864 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
865 fprintf(f, " dbm dbmjz dbmnz");
867 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
868 fprintf(f, " dnsdb");
870 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
871 fprintf(f, " dsearch");
873 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
874 fprintf(f, " ibase");
876 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
877 fprintf(f, " ldap ldapdn ldapm");
879 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
880 fprintf(f, " mysql");
882 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
883 fprintf(f, " nis nis0");
885 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
886 fprintf(f, " nisplus");
888 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
889 fprintf(f, " oracle");
891 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
892 fprintf(f, " passwd");
894 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
895 fprintf(f, " pgsql");
897 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
898 fprintf(f, " sqlite");
900 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
901 fprintf(f, " testdb");
903 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
904 fprintf(f, " whoson");
908 fprintf(f, "Authenticators:");
910 fprintf(f, " cram_md5");
912 #ifdef AUTH_CYRUS_SASL
913 fprintf(f, " cyrus_sasl");
916 fprintf(f, " dovecot");
919 fprintf(f, " gsasl");
921 #ifdef AUTH_HEIMDAL_GSSAPI
922 fprintf(f, " heimdal_gssapi");
924 #ifdef AUTH_PLAINTEXT
925 fprintf(f, " plaintext");
932 fprintf(f, "Routers:");
934 fprintf(f, " accept");
936 #ifdef ROUTER_DNSLOOKUP
937 fprintf(f, " dnslookup");
939 #ifdef ROUTER_IPLITERAL
940 fprintf(f, " ipliteral");
942 #ifdef ROUTER_IPLOOKUP
943 fprintf(f, " iplookup");
945 #ifdef ROUTER_MANUALROUTE
946 fprintf(f, " manualroute");
948 #ifdef ROUTER_QUERYPROGRAM
949 fprintf(f, " queryprogram");
951 #ifdef ROUTER_REDIRECT
952 fprintf(f, " redirect");
956 fprintf(f, "Transports:");
957 #ifdef TRANSPORT_APPENDFILE
958 fprintf(f, " appendfile");
959 #ifdef SUPPORT_MAILDIR
960 fprintf(f, "/maildir");
962 #ifdef SUPPORT_MAILSTORE
963 fprintf(f, "/mailstore");
969 #ifdef TRANSPORT_AUTOREPLY
970 fprintf(f, " autoreply");
972 #ifdef TRANSPORT_LMTP
975 #ifdef TRANSPORT_PIPE
978 #ifdef TRANSPORT_SMTP
983 if (fixed_never_users[0] > 0)
986 fprintf(f, "Fixed never_users: ");
987 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
988 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
989 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
992 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
994 /* Everything else is details which are only worth reporting when debugging.
995 Perhaps the tls_version_report should move into this too. */
1000 /* clang defines __GNUC__ (at least, for me) so test for it first */
1001 #if defined(__clang__)
1002 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1003 #elif defined(__GNUC__)
1004 fprintf(f, "Compiler: GCC [%s]\n",
1008 "? unknown version ?"
1012 fprintf(f, "Compiler: <unknown>\n");
1016 tls_version_report(f);
1019 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1020 if (authi->version_report) {
1021 (*authi->version_report)(f);
1025 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1026 characters; unless it's an ancient version of PCRE in which case it
1028 #ifndef PCRE_PRERELEASE
1029 #define PCRE_PRERELEASE
1032 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1033 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1035 PCRE_MAJOR, PCRE_MINOR,
1036 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1039 #undef EXPAND_AND_QUOTE
1042 for (i = 0; i < lookup_list_count; i++)
1044 if (lookup_list[i]->version_report)
1045 lookup_list[i]->version_report(f);
1048 #ifdef WHITELIST_D_MACROS
1049 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1051 fprintf(f, "WHITELIST_D_MACROS unset\n");
1053 #ifdef TRUSTED_CONFIG_LIST
1054 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1056 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1063 /*************************************************
1064 * Show auxiliary information about Exim *
1065 *************************************************/
1068 show_exim_information(enum commandline_info request, FILE *stream)
1075 fprintf(stream, "Oops, something went wrong.\n");
1079 "The -bI: flag takes a string indicating which information to provide.\n"
1080 "If the string is not recognised, you'll get this help (on stderr).\n"
1082 " exim -bI:help this information\n"
1083 " exim -bI:dscp dscp value keywords known\n"
1084 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1088 for (pp = exim_sieve_extension_list; *pp; ++pp)
1089 fprintf(stream, "%s\n", *pp);
1092 dscp_list_to_stream(stream);
1098 /*************************************************
1099 * Quote a local part *
1100 *************************************************/
1102 /* This function is used when a sender address or a From: or Sender: header
1103 line is being created from the caller's login, or from an authenticated_id. It
1104 applies appropriate quoting rules for a local part.
1106 Argument: the local part
1107 Returns: the local part, quoted if necessary
1111 local_part_quote(uschar *lpart)
1113 BOOL needs_quote = FALSE;
1118 for (t = lpart; !needs_quote && *t != 0; t++)
1120 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1121 (*t != '.' || t == lpart || t[1] == 0);
1124 if (!needs_quote) return lpart;
1127 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1131 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1134 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1137 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1138 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1139 yield = string_cat(yield, &size, &ptr, nq, 1);
1143 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1151 /*************************************************
1152 * Load readline() functions *
1153 *************************************************/
1155 /* This function is called from testing executions that read data from stdin,
1156 but only when running as the calling user. Currently, only -be does this. The
1157 function loads the readline() function library and passes back the functions.
1158 On some systems, it needs the curses library, so load that too, but try without
1159 it if loading fails. All this functionality has to be requested at build time.
1162 fn_readline_ptr pointer to where to put the readline pointer
1163 fn_addhist_ptr pointer to where to put the addhistory function
1165 Returns: the dlopen handle or NULL on failure
1169 set_readline(char * (**fn_readline_ptr)(const char *),
1170 void (**fn_addhist_ptr)(const char *))
1173 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1175 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1176 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1178 if (dlhandle != NULL)
1180 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1181 * char * readline (const char *prompt);
1182 * void add_history (const char *string);
1184 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1185 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1189 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1198 /*************************************************
1199 * Get a line from stdin for testing things *
1200 *************************************************/
1202 /* This function is called when running tests that can take a number of lines
1203 of input (for example, -be and -bt). It handles continuations and trailing
1204 spaces. And prompting and a blank line output on eof. If readline() is in use,
1205 the arguments are non-NULL and provide the relevant functions.
1208 fn_readline readline function or NULL
1209 fn_addhist addhist function or NULL
1211 Returns: pointer to dynamic memory, or NULL at end of file
1215 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1220 uschar *yield = NULL;
1222 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1226 uschar buffer[1024];
1230 char *readline_line = NULL;
1231 if (fn_readline != NULL)
1233 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1234 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1235 p = US readline_line;
1240 /* readline() not in use */
1243 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1247 /* Handle the line */
1249 ss = p + (int)Ustrlen(p);
1250 while (ss > p && isspace(ss[-1])) ss--;
1254 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1257 yield = string_cat(yield, &size, &ptr, p, ss - p);
1260 if (fn_readline != NULL) free(readline_line);
1263 if (ss == p || yield[ptr-1] != '\\')
1271 if (yield == NULL) printf("\n");
1277 /*************************************************
1278 * Output usage information for the program *
1279 *************************************************/
1281 /* This function is called when there are no recipients
1282 or a specific --help argument was added.
1285 progname information on what name we were called by
1287 Returns: DOES NOT RETURN
1291 exim_usage(uschar *progname)
1294 /* Handle specific program invocation varients */
1295 if (Ustrcmp(progname, US"-mailq") == 0)
1298 "mailq - list the contents of the mail queue\n\n"
1299 "For a list of options, see the Exim documentation.\n");
1303 /* Generic usage - we output this whatever happens */
1305 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1306 "not directly from a shell command line. Options and/or arguments control\n"
1307 "what it does when called. For a list of options, see the Exim documentation.\n");
1314 /*************************************************
1315 * Validate that the macros given are okay *
1316 *************************************************/
1318 /* Typically, Exim will drop privileges if macros are supplied. In some
1319 cases, we want to not do so.
1321 Arguments: none (macros is a global)
1322 Returns: true if trusted, false otherwise
1326 macros_trusted(void)
1328 #ifdef WHITELIST_D_MACROS
1330 uschar *whitelisted, *end, *p, **whites, **w;
1331 int white_count, i, n;
1333 BOOL prev_char_item, found;
1338 #ifndef WHITELIST_D_MACROS
1342 /* We only trust -D overrides for some invoking users:
1343 root, the exim run-time user, the optional config owner user.
1344 I don't know why config-owner would be needed, but since they can own the
1345 config files anyway, there's no security risk to letting them override -D. */
1346 if ( ! ((real_uid == root_uid)
1347 || (real_uid == exim_uid)
1348 #ifdef CONFIGURE_OWNER
1349 || (real_uid == config_uid)
1353 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1357 /* Get a list of macros which are whitelisted */
1358 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1359 prev_char_item = FALSE;
1361 for (p = whitelisted; *p != '\0'; ++p)
1363 if (*p == ':' || isspace(*p))
1368 prev_char_item = FALSE;
1371 if (!prev_char_item)
1372 prev_char_item = TRUE;
1379 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1380 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1385 if (i == white_count)
1387 while (*p != '\0' && p < end)
1393 /* The list of macros should be very short. Accept the N*M complexity. */
1394 for (m = macros; m != NULL; m = m->next)
1397 for (w = whites; *w; ++w)
1398 if (Ustrcmp(*w, m->name) == 0)
1405 if (m->replacement == NULL)
1407 len = Ustrlen(m->replacement);
1410 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1411 0, PCRE_EOPT, NULL, 0);
1414 if (n != PCRE_ERROR_NOMATCH)
1415 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1419 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1425 /*************************************************
1426 * Entry point and high-level code *
1427 *************************************************/
1429 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1430 the appropriate action. All the necessary functions are present in the one
1431 binary. I originally thought one should split it up, but it turns out that so
1432 much of the apparatus is needed in each chunk that one might as well just have
1433 it all available all the time, which then makes the coding easier as well.
1436 argc count of entries in argv
1437 argv argument strings, with argv[0] being the program name
1439 Returns: EXIT_SUCCESS if terminated successfully
1440 EXIT_FAILURE otherwise, except when a message has been sent
1441 to the sender, and -oee was given
1445 main(int argc, char **cargv)
1447 uschar **argv = USS cargv;
1448 int arg_receive_timeout = -1;
1449 int arg_smtp_receive_timeout = -1;
1450 int arg_error_handling = error_handling;
1451 int filter_sfd = -1;
1452 int filter_ufd = -1;
1455 int list_queue_option = 0;
1457 int msg_action_arg = -1;
1458 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1459 int queue_only_reason = 0;
1461 int perl_start_option = 0;
1463 int recipients_arg = argc;
1464 int sender_address_domain = 0;
1465 int test_retry_arg = -1;
1466 int test_rewrite_arg = -1;
1467 BOOL arg_queue_only = FALSE;
1468 BOOL bi_option = FALSE;
1469 BOOL checking = FALSE;
1470 BOOL count_queue = FALSE;
1471 BOOL expansion_test = FALSE;
1472 BOOL extract_recipients = FALSE;
1473 BOOL flag_G = FALSE;
1474 BOOL flag_n = FALSE;
1475 BOOL forced_delivery = FALSE;
1476 BOOL f_end_dot = FALSE;
1477 BOOL deliver_give_up = FALSE;
1478 BOOL list_queue = FALSE;
1479 BOOL list_options = FALSE;
1480 BOOL local_queue_only;
1482 BOOL one_msg_action = FALSE;
1483 BOOL queue_only_set = FALSE;
1484 BOOL receiving_message = TRUE;
1485 BOOL sender_ident_set = FALSE;
1486 BOOL session_local_queue_only;
1488 BOOL removed_privilege = FALSE;
1489 BOOL usage_wanted = FALSE;
1490 BOOL verify_address_mode = FALSE;
1491 BOOL verify_as_sender = FALSE;
1492 BOOL version_printed = FALSE;
1493 uschar *alias_arg = NULL;
1494 uschar *called_as = US"";
1495 uschar *cmdline_syslog_name = NULL;
1496 uschar *start_queue_run_id = NULL;
1497 uschar *stop_queue_run_id = NULL;
1498 uschar *expansion_test_message = NULL;
1499 uschar *ftest_domain = NULL;
1500 uschar *ftest_localpart = NULL;
1501 uschar *ftest_prefix = NULL;
1502 uschar *ftest_suffix = NULL;
1503 uschar *malware_test_file = NULL;
1504 uschar *real_sender_address;
1505 uschar *originator_home = US"/";
1510 struct stat statbuf;
1511 pid_t passed_qr_pid = (pid_t)0;
1512 int passed_qr_pipe = -1;
1513 gid_t group_list[NGROUPS_MAX];
1515 /* For the -bI: flag */
1516 enum commandline_info info_flag = CMDINFO_NONE;
1517 BOOL info_stdout = FALSE;
1519 /* Possible options for -R and -S */
1521 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1523 /* Need to define this in case we need to change the environment in order
1524 to get rid of a bogus time zone. We have to make it char rather than uschar
1525 because some OS define it in /usr/include/unistd.h. */
1527 extern char **environ;
1529 /* If the Exim user and/or group and/or the configuration file owner/group were
1530 defined by ref:name at build time, we must now find the actual uid/gid values.
1531 This is a feature to make the lives of binary distributors easier. */
1533 #ifdef EXIM_USERNAME
1534 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1538 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1542 /* If ref:name uses a number as the name, route_finduser() returns
1543 TRUE with exim_uid set and pw coerced to NULL. */
1545 exim_gid = pw->pw_gid;
1546 #ifndef EXIM_GROUPNAME
1550 "exim: ref:name should specify a usercode, not a group.\n"
1551 "exim: can't let you get away with it unless you also specify a group.\n");
1558 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1564 #ifdef EXIM_GROUPNAME
1565 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1567 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1573 #ifdef CONFIGURE_OWNERNAME
1574 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1576 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1577 CONFIGURE_OWNERNAME);
1582 /* We default the system_filter_user to be the Exim run-time user, as a
1583 sane non-root value. */
1584 system_filter_uid = exim_uid;
1586 #ifdef CONFIGURE_GROUPNAME
1587 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1589 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1590 CONFIGURE_GROUPNAME);
1595 /* In the Cygwin environment, some initialization needs doing. It is fudged
1596 in by means of this macro. */
1602 /* Check a field which is patched when we are running Exim within its
1603 testing harness; do a fast initial check, and then the whole thing. */
1605 running_in_test_harness =
1606 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1608 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1609 at the start of a program; however, it seems that some environments do not
1610 follow this. A "strange" locale can affect the formatting of timestamps, so we
1613 setlocale(LC_ALL, "C");
1615 /* Set up the default handler for timing using alarm(). */
1617 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1619 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1620 because store_malloc writes a log entry on failure. */
1622 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1623 if (log_buffer == NULL)
1625 fprintf(stderr, "exim: failed to get store for log buffer\n");
1629 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1630 NULL when the daemon is run and the file is closed. We have to use this
1631 indirection, because some systems don't allow writing to the variable "stderr".
1634 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1636 /* Arrange for the PCRE regex library to use our store functions. Note that
1637 the normal calls are actually macros that add additional arguments for
1638 debugging purposes so we have to assign specially constructed functions here.
1639 The default is to use store in the stacking pool, but this is overridden in the
1640 regex_must_compile() function. */
1642 pcre_malloc = function_store_get;
1643 pcre_free = function_dummy_free;
1645 /* Ensure there is a big buffer for temporary use in several places. It is put
1646 in malloc store so that it can be freed for enlargement if necessary. */
1648 big_buffer = store_malloc(big_buffer_size);
1650 /* Set up the handler for the data request signal, and set the initial
1651 descriptive text. */
1653 set_process_info("initializing");
1654 os_restarting_signal(SIGUSR1, usr1_handler);
1656 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1657 in the daemon code. For the rest of Exim's uses, we ignore it. */
1659 signal(SIGHUP, SIG_IGN);
1661 /* We don't want to die on pipe errors as the code is written to handle
1662 the write error instead. */
1664 signal(SIGPIPE, SIG_IGN);
1666 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1667 set to SIG_IGN. This causes subprocesses that complete before the parent
1668 process waits for them not to hang around, so when Exim calls wait(), nothing
1669 is there. The wait() code has been made robust against this, but let's ensure
1670 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1671 ending status. We use sigaction rather than plain signal() on those OS where
1672 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1673 problem on AIX with this.) */
1677 struct sigaction act;
1678 act.sa_handler = SIG_DFL;
1679 sigemptyset(&(act.sa_mask));
1681 sigaction(SIGCHLD, &act, NULL);
1684 signal(SIGCHLD, SIG_DFL);
1687 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1692 /* Set up the version number. Set up the leading 'E' for the external form of
1693 message ids, set the pointer to the internal form, and initialize it to
1694 indicate no message being processed. */
1697 message_id_option[0] = '-';
1698 message_id_external = message_id_option + 1;
1699 message_id_external[0] = 'E';
1700 message_id = message_id_external + 1;
1703 /* Set the umask to zero so that any files Exim creates using open() are
1704 created with the modes that it specifies. NOTE: Files created with fopen() have
1705 a problem, which was not recognized till rather late (February 2006). With this
1706 umask, such files will be world writeable. (They are all content scanning files
1707 in the spool directory, which isn't world-accessible, so this is not a
1708 disaster, but it's untidy.) I don't want to change this overall setting,
1709 however, because it will interact badly with the open() calls. Instead, there's
1710 now a function called modefopen() that fiddles with the umask while calling
1715 /* Precompile the regular expression for matching a message id. Keep this in
1716 step with the code that generates ids in the accept.c module. We need to do
1717 this here, because the -M options check their arguments for syntactic validity
1718 using mac_ismsgid, which uses this. */
1721 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1723 /* Precompile the regular expression that is used for matching an SMTP error
1724 code, possibly extended, at the start of an error message. Note that the
1725 terminating whitespace character is included. */
1728 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1731 #ifdef WHITELIST_D_MACROS
1732 /* Precompile the regular expression used to filter the content of macros
1733 given to -D for permissibility. */
1735 regex_whitelisted_macro =
1736 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1740 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1741 this seems to be a generally accepted convention, since one finds symbolic
1742 links called "mailq" in standard OS configurations. */
1744 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1745 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1748 receiving_message = FALSE;
1749 called_as = US"-mailq";
1752 /* If the program is called as "rmail" treat it as equivalent to
1753 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1754 i.e. preventing a single dot on a line from terminating the message, and
1755 returning with zero return code, even in cases of error (provided an error
1756 message has been sent). */
1758 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1759 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1762 called_as = US"-rmail";
1763 errors_sender_rc = EXIT_SUCCESS;
1766 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1767 this is a smail convention. */
1769 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1770 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1772 smtp_input = smtp_batched_input = TRUE;
1773 called_as = US"-rsmtp";
1776 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1777 this is a smail convention. */
1779 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1780 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1783 receiving_message = FALSE;
1784 called_as = US"-runq";
1787 /* If the program is called as "newaliases" treat it as equivalent to
1788 "exim -bi"; this is a sendmail convention. */
1790 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1791 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1794 receiving_message = FALSE;
1795 called_as = US"-newaliases";
1798 /* Save the original effective uid for a couple of uses later. It should
1799 normally be root, but in some esoteric environments it may not be. */
1801 original_euid = geteuid();
1803 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1804 to be the same as the real ones. This makes a difference only if Exim is setuid
1805 (or setgid) to something other than root, which could be the case in some
1806 special configurations. */
1808 real_uid = getuid();
1809 real_gid = getgid();
1811 if (real_uid == root_uid)
1813 rv = setgid(real_gid);
1816 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1817 (long int)real_gid, strerror(errno));
1820 rv = setuid(real_uid);
1823 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1824 (long int)real_uid, strerror(errno));
1829 /* If neither the original real uid nor the original euid was root, Exim is
1830 running in an unprivileged state. */
1832 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1834 /* Scan the program's arguments. Some can be dealt with right away; others are
1835 simply recorded for checking and handling afterwards. Do a high-level switch
1836 on the second character (the one after '-'), to save some effort. */
1838 for (i = 1; i < argc; i++)
1840 BOOL badarg = FALSE;
1841 uschar *arg = argv[i];
1845 /* An argument not starting with '-' is the start of a recipients list;
1846 break out of the options-scanning loop. */
1854 /* An option consistion of -- terminates the options */
1856 if (Ustrcmp(arg, "--") == 0)
1858 recipients_arg = i + 1;
1862 /* Handle flagged options */
1864 switchchar = arg[1];
1867 /* Make all -ex options synonymous with -oex arguments, since that
1868 is assumed by various callers. Also make -qR options synonymous with -R
1869 options, as that seems to be required as well. Allow for -qqR too, and
1870 the same for -S options. */
1872 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1873 Ustrncmp(arg+1, "qR", 2) == 0 ||
1874 Ustrncmp(arg+1, "qS", 2) == 0)
1876 switchchar = arg[2];
1879 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1881 switchchar = arg[3];
1883 queue_2stage = TRUE;
1886 /* Make -r synonymous with -f, since it is a documented alias */
1888 else if (arg[1] == 'r') switchchar = 'f';
1890 /* Make -ov synonymous with -v */
1892 else if (Ustrcmp(arg, "-ov") == 0)
1898 /* deal with --option_aliases */
1899 else if (switchchar == '-')
1901 if (Ustrcmp(argrest, "help") == 0)
1903 usage_wanted = TRUE;
1906 else if (Ustrcmp(argrest, "version") == 0)
1913 /* High-level switch on active initial letter */
1918 /* sendmail uses -Ac and -Am to control which .cf file is used;
1921 if (*argrest == '\0') { badarg = TRUE; break; }
1924 BOOL ignore = FALSE;
1929 if (*(argrest + 1) == '\0')
1933 if (!ignore) { badarg = TRUE; break; }
1937 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1938 so has no need of it. */
1941 if (*argrest == 0) i++; /* Skip over the type */
1946 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1948 /* -bd: Run in daemon mode, awaiting SMTP connections.
1949 -bdf: Ditto, but in the foreground.
1952 if (*argrest == 'd')
1954 daemon_listen = TRUE;
1955 if (*(++argrest) == 'f') background_daemon = FALSE;
1956 else if (*argrest != 0) { badarg = TRUE; break; }
1959 /* -be: Run in expansion test mode
1960 -bem: Ditto, but read a message from a file first
1963 else if (*argrest == 'e')
1965 expansion_test = checking = TRUE;
1966 if (argrest[1] == 'm')
1968 if (++i >= argc) { badarg = TRUE; break; }
1969 expansion_test_message = argv[i];
1972 if (argrest[1] != 0) { badarg = TRUE; break; }
1975 /* -bF: Run system filter test */
1977 else if (*argrest == 'F')
1979 filter_test |= FTEST_SYSTEM;
1980 if (*(++argrest) != 0) { badarg = TRUE; break; }
1981 if (++i < argc) filter_test_sfile = argv[i]; else
1983 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1988 /* -bf: Run user filter test
1989 -bfd: Set domain for filter testing
1990 -bfl: Set local part for filter testing
1991 -bfp: Set prefix for filter testing
1992 -bfs: Set suffix for filter testing
1995 else if (*argrest == 'f')
1997 if (*(++argrest) == 0)
1999 filter_test |= FTEST_USER;
2000 if (++i < argc) filter_test_ufile = argv[i]; else
2002 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2010 fprintf(stderr, "exim: string expected after %s\n", arg);
2013 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2014 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2015 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2016 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2017 else { badarg = TRUE; break; }
2021 /* -bh: Host checking - an IP address must follow. */
2023 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2025 if (++i >= argc) { badarg = TRUE; break; }
2026 sender_host_address = argv[i];
2027 host_checking = checking = log_testing_mode = TRUE;
2028 host_checking_callout = argrest[1] == 'c';
2031 /* -bi: This option is used by sendmail to initialize *the* alias file,
2032 though it has the -oA option to specify a different file. Exim has no
2033 concept of *the* alias file, but since Sun's YP make script calls
2034 sendmail this way, some support must be provided. */
2036 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2038 /* -bI: provide information, of the type to follow after a colon.
2039 This is an Exim flag. */
2041 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2043 uschar *p = &argrest[2];
2044 info_flag = CMDINFO_HELP;
2047 if (strcmpic(p, CUS"sieve") == 0)
2049 info_flag = CMDINFO_SIEVE;
2052 else if (strcmpic(p, CUS"dscp") == 0)
2054 info_flag = CMDINFO_DSCP;
2057 else if (strcmpic(p, CUS"help") == 0)
2064 /* -bm: Accept and deliver message - the default option. Reinstate
2065 receiving_message, which got turned off for all -b options. */
2067 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2069 /* -bmalware: test the filename given for malware */
2071 else if (Ustrcmp(argrest, "malware") == 0)
2073 if (++i >= argc) { badarg = TRUE; break; }
2074 malware_test_file = argv[i];
2077 /* -bnq: For locally originating messages, do not qualify unqualified
2078 addresses. In the envelope, this causes errors; in header lines they
2081 else if (Ustrcmp(argrest, "nq") == 0)
2083 allow_unqualified_sender = FALSE;
2084 allow_unqualified_recipient = FALSE;
2087 /* -bpxx: List the contents of the mail queue, in various forms. If
2088 the option is -bpc, just a queue count is needed. Otherwise, if the
2089 first letter after p is r, then order is random. */
2091 else if (*argrest == 'p')
2093 if (*(++argrest) == 'c')
2096 if (*(++argrest) != 0) badarg = TRUE;
2100 if (*argrest == 'r')
2102 list_queue_option = 8;
2105 else list_queue_option = 0;
2109 /* -bp: List the contents of the mail queue, top-level only */
2111 if (*argrest == 0) {}
2113 /* -bpu: List the contents of the mail queue, top-level undelivered */
2115 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2117 /* -bpa: List the contents of the mail queue, including all delivered */
2119 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2121 /* Unknown after -bp[r] */
2131 /* -bP: List the configuration variables given as the address list.
2132 Force -v, so configuration errors get displayed. */
2134 else if (Ustrcmp(argrest, "P") == 0)
2136 list_options = TRUE;
2137 debug_selector |= D_v;
2138 debug_file = stderr;
2141 /* -brt: Test retry configuration lookup */
2143 else if (Ustrcmp(argrest, "rt") == 0)
2145 test_retry_arg = i + 1;
2149 /* -brw: Test rewrite configuration */
2151 else if (Ustrcmp(argrest, "rw") == 0)
2153 test_rewrite_arg = i + 1;
2157 /* -bS: Read SMTP commands on standard input, but produce no replies -
2158 all errors are reported by sending messages. */
2160 else if (Ustrcmp(argrest, "S") == 0)
2161 smtp_input = smtp_batched_input = receiving_message = TRUE;
2163 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2164 on standard output. */
2166 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2168 /* -bt: address testing mode */
2170 else if (Ustrcmp(argrest, "t") == 0)
2171 address_test_mode = checking = log_testing_mode = TRUE;
2173 /* -bv: verify addresses */
2175 else if (Ustrcmp(argrest, "v") == 0)
2176 verify_address_mode = checking = log_testing_mode = TRUE;
2178 /* -bvs: verify sender addresses */
2180 else if (Ustrcmp(argrest, "vs") == 0)
2182 verify_address_mode = checking = log_testing_mode = TRUE;
2183 verify_as_sender = TRUE;
2186 /* -bV: Print version string and support details */
2188 else if (Ustrcmp(argrest, "V") == 0)
2190 printf("Exim version %s #%s built %s\n", version_string,
2191 version_cnumber, version_date);
2192 printf("%s\n", CS version_copyright);
2193 version_printed = TRUE;
2194 show_whats_supported(stdout);
2197 /* -bw: inetd wait mode, accept a listening socket as stdin */
2199 else if (*argrest == 'w')
2201 inetd_wait_mode = TRUE;
2202 background_daemon = FALSE;
2203 daemon_listen = TRUE;
2204 if (*(++argrest) != '\0')
2206 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2207 if (inetd_wait_timeout <= 0)
2209 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2219 /* -C: change configuration file list; ignore if it isn't really
2220 a change! Enforce a prefix check if required. */
2225 if(++i < argc) argrest = argv[i]; else
2226 { badarg = TRUE; break; }
2228 if (Ustrcmp(config_main_filelist, argrest) != 0)
2230 #ifdef ALT_CONFIG_PREFIX
2232 int len = Ustrlen(ALT_CONFIG_PREFIX);
2233 uschar *list = argrest;
2235 while((filename = string_nextinlist(&list, &sep, big_buffer,
2236 big_buffer_size)) != NULL)
2238 if ((Ustrlen(filename) < len ||
2239 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2240 Ustrstr(filename, "/../") != NULL) &&
2241 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2243 fprintf(stderr, "-C Permission denied\n");
2248 if (real_uid != root_uid)
2250 #ifdef TRUSTED_CONFIG_LIST
2252 if (real_uid != exim_uid
2253 #ifdef CONFIGURE_OWNER
2254 && real_uid != config_uid
2257 trusted_config = FALSE;
2260 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2263 struct stat statbuf;
2265 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2266 (statbuf.st_uid != root_uid /* owner not root */
2267 #ifdef CONFIGURE_OWNER
2268 && statbuf.st_uid != config_uid /* owner not the special one */
2271 (statbuf.st_gid != root_gid /* group not root */
2272 #ifdef CONFIGURE_GROUP
2273 && statbuf.st_gid != config_gid /* group not the special one */
2275 && (statbuf.st_mode & 020) != 0 /* group writeable */
2277 (statbuf.st_mode & 2) != 0) /* world writeable */
2279 trusted_config = FALSE;
2284 /* Well, the trust list at least is up to scratch... */
2285 void *reset_point = store_get(0);
2286 uschar *trusted_configs[32];
2290 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2292 uschar *start = big_buffer, *nl;
2293 while (*start && isspace(*start))
2297 nl = Ustrchr(start, '\n');
2300 trusted_configs[nr_configs++] = string_copy(start);
2301 if (nr_configs == 32)
2309 uschar *list = argrest;
2311 while (trusted_config && (filename = string_nextinlist(&list,
2312 &sep, big_buffer, big_buffer_size)) != NULL)
2314 for (i=0; i < nr_configs; i++)
2316 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2319 if (i == nr_configs)
2321 trusted_config = FALSE;
2325 store_reset(reset_point);
2329 /* No valid prefixes found in trust_list file. */
2330 trusted_config = FALSE;
2336 /* Could not open trust_list file. */
2337 trusted_config = FALSE;
2341 /* Not root; don't trust config */
2342 trusted_config = FALSE;
2346 config_main_filelist = argrest;
2347 config_changed = TRUE;
2352 /* -D: set up a macro definition */
2355 #ifdef DISABLE_D_OPTION
2356 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2361 macro_item *mlast = NULL;
2364 uschar *s = argrest;
2366 while (isspace(*s)) s++;
2368 if (*s < 'A' || *s > 'Z')
2370 fprintf(stderr, "exim: macro name set by -D must start with "
2371 "an upper case letter\n");
2375 while (isalnum(*s) || *s == '_')
2377 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2381 if (ptr == 0) { badarg = TRUE; break; }
2382 while (isspace(*s)) s++;
2385 if (*s++ != '=') { badarg = TRUE; break; }
2386 while (isspace(*s)) s++;
2389 for (m = macros; m != NULL; m = m->next)
2391 if (Ustrcmp(m->name, name) == 0)
2393 fprintf(stderr, "exim: duplicated -D in command line\n");
2399 m = store_get(sizeof(macro_item) + Ustrlen(name));
2401 m->command_line = TRUE;
2402 if (mlast == NULL) macros = m; else mlast->next = m;
2403 Ustrcpy(m->name, name);
2404 m->replacement = string_copy(s);
2406 if (clmacro_count >= MAX_CLMACROS)
2408 fprintf(stderr, "exim: too many -D options on command line\n");
2411 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2417 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2418 The latter is now a no-op, retained for compatibility only. If -dd is used,
2419 debugging subprocesses of the daemon is disabled. */
2422 if (Ustrcmp(argrest, "ropcr") == 0)
2424 /* drop_cr = TRUE; */
2427 /* Use an intermediate variable so that we don't set debugging while
2428 decoding the debugging bits. */
2432 unsigned int selector = D_default;
2435 if (*argrest == 'd')
2437 debug_daemon = TRUE;
2441 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2442 debug_options_count, US"debug", 0);
2443 debug_selector = selector;
2448 /* -E: This is a local error message. This option is not intended for
2449 external use at all, but is not restricted to trusted callers because it
2450 does no harm (just suppresses certain error messages) and if Exim is run
2451 not setuid root it won't always be trusted when it generates error
2452 messages using this option. If there is a message id following -E, point
2453 message_reference at it, for logging. */
2456 local_error_message = TRUE;
2457 if (mac_ismsgid(argrest)) message_reference = argrest;
2461 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2462 option, so it looks as if historically the -oex options are also callable
2463 without the leading -o. So we have to accept them. Before the switch,
2464 anything starting -oe has been converted to -e. Exim does not support all
2465 of the sendmail error options. */
2468 if (Ustrcmp(argrest, "e") == 0)
2470 arg_error_handling = ERRORS_SENDER;
2471 errors_sender_rc = EXIT_SUCCESS;
2473 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2474 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2475 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2476 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2481 /* -F: Set sender's full name, used instead of the gecos entry from
2482 the password file. Since users can usually alter their gecos entries,
2483 there's no security involved in using this instead. The data can follow
2484 the -F or be in the next argument. */
2489 if(++i < argc) argrest = argv[i]; else
2490 { badarg = TRUE; break; }
2492 originator_name = argrest;
2493 sender_name_forced = TRUE;
2497 /* -f: Set sender's address - this value is only actually used if Exim is
2498 run by a trusted user, or if untrusted_set_sender is set and matches the
2499 address, except that the null address can always be set by any user. The
2500 test for this happens later, when the value given here is ignored when not
2501 permitted. For an untrusted user, the actual sender is still put in Sender:
2502 if it doesn't match the From: header (unless no_local_from_check is set).
2503 The data can follow the -f or be in the next argument. The -r switch is an
2504 obsolete form of -f but since there appear to be programs out there that
2505 use anything that sendmail has ever supported, better accept it - the
2506 synonymizing is done before the switch above.
2508 At this stage, we must allow domain literal addresses, because we don't
2509 know what the setting of allow_domain_literals is yet. Ditto for trailing
2510 dots and strip_trailing_dot. */
2518 if (i+1 < argc) argrest = argv[++i]; else
2519 { badarg = TRUE; break; }
2523 sender_address = string_sprintf(""); /* Ensure writeable memory */
2527 uschar *temp = argrest + Ustrlen(argrest) - 1;
2528 while (temp >= argrest && isspace(*temp)) temp--;
2529 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2530 allow_domain_literals = TRUE;
2531 strip_trailing_dot = TRUE;
2532 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2533 &sender_address_domain, TRUE);
2534 allow_domain_literals = FALSE;
2535 strip_trailing_dot = FALSE;
2536 if (sender_address == NULL)
2538 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2539 return EXIT_FAILURE;
2542 sender_address_forced = TRUE;
2546 /* -G: sendmail invocation to specify that it's a gateway submission and
2547 sendmail may complain about problems instead of fixing them.
2548 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2549 not at this time complain about problems. */
2555 /* -h: Set the hop count for an incoming message. Exim does not currently
2556 support this; it always computes it by counting the Received: headers.
2557 To put it in will require a change to the spool header file format. */
2562 if(++i < argc) argrest = argv[i]; else
2563 { badarg = TRUE; break; }
2565 if (!isdigit(*argrest)) badarg = TRUE;
2569 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2570 not to be documented for sendmail but mailx (at least) uses it) */
2573 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2577 /* -L: set the identifier used for syslog; equivalent to setting
2578 syslog_processname in the config file, but needs to be an admin option. */
2581 if (*argrest == '\0')
2583 if(++i < argc) argrest = argv[i]; else
2584 { badarg = TRUE; break; }
2586 sz = Ustrlen(argrest);
2589 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2590 return EXIT_FAILURE;
2594 fprintf(stderr, "exim: the -L syslog name is too short\n");
2595 return EXIT_FAILURE;
2597 cmdline_syslog_name = argrest;
2601 receiving_message = FALSE;
2603 /* -MC: continue delivery of another message via an existing open
2604 file descriptor. This option is used for an internal call by the
2605 smtp transport when there is a pending message waiting to go to an
2606 address to which it has got a connection. Five subsequent arguments are
2607 required: transport name, host name, IP address, sequence number, and
2608 message_id. Transports may decline to create new processes if the sequence
2609 number gets too big. The channel is stdin. This (-MC) must be the last
2610 argument. There's a subsequent check that the real-uid is privileged.
2612 If we are running in the test harness. delay for a bit, to let the process
2613 that set this one up complete. This makes for repeatability of the logging,
2616 if (Ustrcmp(argrest, "C") == 0)
2618 union sockaddr_46 interface_sock;
2619 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2623 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2624 return EXIT_FAILURE;
2627 if (msg_action_arg >= 0)
2629 fprintf(stderr, "exim: incompatible arguments\n");
2630 return EXIT_FAILURE;
2633 continue_transport = argv[++i];
2634 continue_hostname = argv[++i];
2635 continue_host_address = argv[++i];
2636 continue_sequence = Uatoi(argv[++i]);
2637 msg_action = MSG_DELIVER;
2638 msg_action_arg = ++i;
2639 forced_delivery = TRUE;
2640 queue_run_pid = passed_qr_pid;
2641 queue_run_pipe = passed_qr_pipe;
2643 if (!mac_ismsgid(argv[i]))
2645 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2647 return EXIT_FAILURE;
2650 /* Set up $sending_ip_address and $sending_port */
2652 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2654 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2658 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2660 return EXIT_FAILURE;
2663 if (running_in_test_harness) millisleep(500);
2667 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2668 precedes -MC (see above). The flag indicates that the host to which
2669 Exim is connected has accepted an AUTH sequence. */
2671 else if (Ustrcmp(argrest, "CA") == 0)
2673 smtp_authenticated = TRUE;
2677 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2678 that exim is connected to supports the esmtp extension DSN */
2679 else if (Ustrcmp(argrest, "CD") == 0)
2681 smtp_use_dsn = TRUE;
2685 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2686 it preceded -MC (see above) */
2688 else if (Ustrcmp(argrest, "CP") == 0)
2690 smtp_use_pipelining = TRUE;
2694 /* -MCQ: pass on the pid of the queue-running process that started
2695 this chain of deliveries and the fd of its synchronizing pipe; this
2696 is useful only when it precedes -MC (see above) */
2698 else if (Ustrcmp(argrest, "CQ") == 0)
2700 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2702 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2707 /* -MCS: set the smtp_use_size flag; this is useful only when it
2708 precedes -MC (see above) */
2710 else if (Ustrcmp(argrest, "CS") == 0)
2712 smtp_use_size = TRUE;
2716 /* -MCT: set the tls_offered flag; this is useful only when it
2717 precedes -MC (see above). The flag indicates that the host to which
2718 Exim is connected has offered TLS support. */
2721 else if (Ustrcmp(argrest, "CT") == 0)
2728 /* -M[x]: various operations on the following list of message ids:
2729 -M deliver the messages, ignoring next retry times and thawing
2730 -Mc deliver the messages, checking next retry times, no thawing
2731 -Mf freeze the messages
2732 -Mg give up on the messages
2733 -Mt thaw the messages
2734 -Mrm remove the messages
2735 In the above cases, this must be the last option. There are also the
2736 following options which are followed by a single message id, and which
2737 act on that message. Some of them use the "recipient" addresses as well.
2738 -Mar add recipient(s)
2739 -Mmad mark all recipients delivered
2740 -Mmd mark recipients(s) delivered
2742 -Mset load a message for use with -be
2744 -Mvc show copy (of whole message, in RFC 2822 format)
2749 else if (*argrest == 0)
2751 msg_action = MSG_DELIVER;
2752 forced_delivery = deliver_force_thaw = TRUE;
2754 else if (Ustrcmp(argrest, "ar") == 0)
2756 msg_action = MSG_ADD_RECIPIENT;
2757 one_msg_action = TRUE;
2759 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2760 else if (Ustrcmp(argrest, "es") == 0)
2762 msg_action = MSG_EDIT_SENDER;
2763 one_msg_action = TRUE;
2765 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2766 else if (Ustrcmp(argrest, "g") == 0)
2768 msg_action = MSG_DELIVER;
2769 deliver_give_up = TRUE;
2771 else if (Ustrcmp(argrest, "mad") == 0)
2773 msg_action = MSG_MARK_ALL_DELIVERED;
2775 else if (Ustrcmp(argrest, "md") == 0)
2777 msg_action = MSG_MARK_DELIVERED;
2778 one_msg_action = TRUE;
2780 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2781 else if (Ustrcmp(argrest, "set") == 0)
2783 msg_action = MSG_LOAD;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2787 else if (Ustrcmp(argrest, "vb") == 0)
2789 msg_action = MSG_SHOW_BODY;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "vc") == 0)
2794 msg_action = MSG_SHOW_COPY;
2795 one_msg_action = TRUE;
2797 else if (Ustrcmp(argrest, "vh") == 0)
2799 msg_action = MSG_SHOW_HEADER;
2800 one_msg_action = TRUE;
2802 else if (Ustrcmp(argrest, "vl") == 0)
2804 msg_action = MSG_SHOW_LOG;
2805 one_msg_action = TRUE;
2807 else { badarg = TRUE; break; }
2809 /* All the -Mxx options require at least one message id. */
2811 msg_action_arg = i + 1;
2812 if (msg_action_arg >= argc)
2814 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2815 return EXIT_FAILURE;
2818 /* Some require only message ids to follow */
2820 if (!one_msg_action)
2823 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2825 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2827 return EXIT_FAILURE;
2829 goto END_ARG; /* Remaining args are ids */
2832 /* Others require only one message id, possibly followed by addresses,
2833 which will be handled as normal arguments. */
2837 if (!mac_ismsgid(argv[msg_action_arg]))
2839 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2840 argv[msg_action_arg], arg);
2841 return EXIT_FAILURE;
2848 /* Some programs seem to call the -om option without the leading o;
2849 for sendmail it askes for "me too". Exim always does this. */
2852 if (*argrest != 0) badarg = TRUE;
2856 /* -N: don't do delivery - a debugging option that stops transports doing
2857 their thing. It implies debugging at the D_v level. */
2862 dont_deliver = TRUE;
2863 debug_selector |= D_v;
2864 debug_file = stderr;
2870 /* -n: This means "don't alias" in sendmail, apparently.
2871 For normal invocations, it has no effect.
2872 It may affect some other options. */
2878 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2879 option to the specified value. This form uses long names. We need to handle
2880 -O option=value and -Ooption=value. */
2887 fprintf(stderr, "exim: string expected after -O\n");
2895 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2898 if (*argrest == 'A')
2900 alias_arg = argrest + 1;
2901 if (alias_arg[0] == 0)
2903 if (i+1 < argc) alias_arg = argv[++i]; else
2905 fprintf(stderr, "exim: string expected after -oA\n");
2911 /* -oB: Set a connection message max value for remote deliveries */
2913 else if (*argrest == 'B')
2915 uschar *p = argrest + 1;
2918 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2920 connection_max_messages = 1;
2929 fprintf(stderr, "exim: number expected after -oB\n");
2932 connection_max_messages = Uatoi(p);
2936 /* -odb: background delivery */
2938 else if (Ustrcmp(argrest, "db") == 0)
2940 synchronous_delivery = FALSE;
2941 arg_queue_only = FALSE;
2942 queue_only_set = TRUE;
2945 /* -odf: foreground delivery (smail-compatible option); same effect as
2946 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2949 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2951 synchronous_delivery = TRUE;
2952 arg_queue_only = FALSE;
2953 queue_only_set = TRUE;
2956 /* -odq: queue only */
2958 else if (Ustrcmp(argrest, "dq") == 0)
2960 synchronous_delivery = FALSE;
2961 arg_queue_only = TRUE;
2962 queue_only_set = TRUE;
2965 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2966 but no remote delivery */
2968 else if (Ustrcmp(argrest, "dqs") == 0)
2971 arg_queue_only = FALSE;
2972 queue_only_set = TRUE;
2975 /* -oex: Sendmail error flags. As these are also accepted without the
2976 leading -o prefix, for compatibility with vacation and other callers,
2977 they are handled with -e above. */
2979 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2980 -oitrue: Another sendmail syntax for the same */
2982 else if (Ustrcmp(argrest, "i") == 0 ||
2983 Ustrcmp(argrest, "itrue") == 0)
2986 /* -oM*: Set various characteristics for an incoming message; actually
2987 acted on for trusted callers only. */
2989 else if (*argrest == 'M')
2993 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2997 /* -oMa: Set sender host address */
2999 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3001 /* -oMaa: Set authenticator name */
3003 else if (Ustrcmp(argrest, "Maa") == 0)
3004 sender_host_authenticated = argv[++i];
3006 /* -oMas: setting authenticated sender */
3008 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3010 /* -oMai: setting authenticated id */
3012 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3014 /* -oMi: Set incoming interface address */
3016 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3018 /* -oMm: Message reference */
3020 else if (Ustrcmp(argrest, "Mm") == 0)
3022 if (!mac_ismsgid(argv[i+1]))
3024 fprintf(stderr,"-oMm must be a valid message ID\n");
3027 if (!trusted_config)
3029 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3032 message_reference = argv[++i];
3035 /* -oMr: Received protocol */
3037 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3039 /* -oMs: Set sender host name */
3041 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3043 /* -oMt: Set sender ident */
3045 else if (Ustrcmp(argrest, "Mt") == 0)
3047 sender_ident_set = TRUE;
3048 sender_ident = argv[++i];
3051 /* Else a bad argument */
3060 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3061 seem to call this as -m (undocumented), so that is also accepted (see
3064 else if (Ustrcmp(argrest, "m") == 0) {}
3066 /* -oo: An ancient flag for old-style addresses which still seems to
3067 crop up in some calls (see in SCO). */
3069 else if (Ustrcmp(argrest, "o") == 0) {}
3071 /* -oP <name>: set pid file path for daemon */
3073 else if (Ustrcmp(argrest, "P") == 0)
3074 override_pid_file_path = argv[++i];
3076 /* -or <n>: set timeout for non-SMTP acceptance
3077 -os <n>: set timeout for SMTP acceptance */
3079 else if (*argrest == 'r' || *argrest == 's')
3081 int *tp = (*argrest == 'r')?
3082 &arg_receive_timeout : &arg_smtp_receive_timeout;
3083 if (argrest[1] == 0)
3085 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3087 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3090 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3095 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3097 else if (Ustrcmp(argrest, "X") == 0)
3098 override_local_interfaces = argv[++i];
3100 /* Unknown -o argument */
3106 /* -ps: force Perl startup; -pd force delayed Perl startup */
3110 if (*argrest == 's' && argrest[1] == 0)
3112 perl_start_option = 1;
3115 if (*argrest == 'd' && argrest[1] == 0)
3117 perl_start_option = -1;
3122 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3123 which sets the host protocol and host name */
3127 if (i+1 < argc) argrest = argv[++i]; else
3128 { badarg = TRUE; break; }
3133 uschar *hn = Ustrchr(argrest, ':');
3136 received_protocol = argrest;
3140 received_protocol = string_copyn(argrest, hn - argrest);
3141 sender_host_name = hn + 1;
3148 receiving_message = FALSE;
3149 if (queue_interval >= 0)
3151 fprintf(stderr, "exim: -q specified more than once\n");
3155 /* -qq...: Do queue runs in a 2-stage manner */
3157 if (*argrest == 'q')
3159 queue_2stage = TRUE;
3163 /* -qi...: Do only first (initial) deliveries */
3165 if (*argrest == 'i')
3167 queue_run_first_delivery = TRUE;
3171 /* -qf...: Run the queue, forcing deliveries
3172 -qff..: Ditto, forcing thawing as well */
3174 if (*argrest == 'f')
3176 queue_run_force = TRUE;
3177 if (*(++argrest) == 'f')
3179 deliver_force_thaw = TRUE;
3184 /* -q[f][f]l...: Run the queue only on local deliveries */
3186 if (*argrest == 'l')
3188 queue_run_local = TRUE;
3192 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3193 optionally starting from a given message id. */
3195 if (*argrest == 0 &&
3196 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3199 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3200 start_queue_run_id = argv[++i];
3201 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3202 stop_queue_run_id = argv[++i];
3205 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3206 optionally local only. */
3211 queue_interval = readconf_readtime(argrest, 0, FALSE);
3213 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3214 if (queue_interval <= 0)
3216 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3223 case 'R': /* Synonymous with -qR... */
3224 receiving_message = FALSE;
3226 /* -Rf: As -R (below) but force all deliveries,
3227 -Rff: Ditto, but also thaw all frozen messages,
3228 -Rr: String is regex
3229 -Rrf: Regex and force
3230 -Rrff: Regex and force and thaw
3232 in all cases provided there are no further characters in this
3238 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3240 if (Ustrcmp(argrest, rsopts[i]) == 0)
3242 if (i != 2) queue_run_force = TRUE;
3243 if (i >= 2) deliver_selectstring_regex = TRUE;
3244 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3245 argrest += Ustrlen(rsopts[i]);
3250 /* -R: Set string to match in addresses for forced queue run to
3251 pick out particular messages. */
3255 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3257 fprintf(stderr, "exim: string expected after -R\n");
3261 else deliver_selectstring = argrest;
3265 /* -r: an obsolete synonym for -f (see above) */
3268 /* -S: Like -R but works on sender. */
3270 case 'S': /* Synonymous with -qS... */
3271 receiving_message = FALSE;
3273 /* -Sf: As -S (below) but force all deliveries,
3274 -Sff: Ditto, but also thaw all frozen messages,
3275 -Sr: String is regex
3276 -Srf: Regex and force
3277 -Srff: Regex and force and thaw
3279 in all cases provided there are no further characters in this
3285 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3287 if (Ustrcmp(argrest, rsopts[i]) == 0)
3289 if (i != 2) queue_run_force = TRUE;
3290 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3291 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3292 argrest += Ustrlen(rsopts[i]);
3297 /* -S: Set string to match in addresses for forced queue run to
3298 pick out particular messages. */
3302 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3304 fprintf(stderr, "exim: string expected after -S\n");
3308 else deliver_selectstring_sender = argrest;
3311 /* -Tqt is an option that is exclusively for use by the testing suite.
3312 It is not recognized in other circumstances. It allows for the setting up
3313 of explicit "queue times" so that various warning/retry things can be
3314 tested. Otherwise variability of clock ticks etc. cause problems. */
3317 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3318 fudged_queue_times = argv[++i];
3323 /* -t: Set flag to extract recipients from body of message. */
3326 if (*argrest == 0) extract_recipients = TRUE;
3328 /* -ti: Set flag to extract recipients from body of message, and also
3329 specify that dot does not end the message. */
3331 else if (Ustrcmp(argrest, "i") == 0)
3333 extract_recipients = TRUE;
3337 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3340 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3347 /* -U: This means "initial user submission" in sendmail, apparently. The
3348 doc claims that in future sendmail may refuse syntactically invalid
3349 messages instead of fixing them. For the moment, we just ignore it. */
3355 /* -v: verify things - this is a very low-level debugging */
3360 debug_selector |= D_v;
3361 debug_file = stderr;
3367 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3369 The -x flag tells the sendmail command that mail from a local
3370 mail program has National Language Support (NLS) extended characters
3371 in the body of the mail item. The sendmail command can send mail with
3372 extended NLS characters across networks that normally corrupts these
3375 As Exim is 8-bit clean, it just ignores this flag. */
3378 if (*argrest != 0) badarg = TRUE;
3381 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3382 logs to that file. We swallow the parameter and otherwise ignore it. */
3385 if (*argrest == '\0')
3389 fprintf(stderr, "exim: string expected after -X\n");
3395 /* All other initial characters are errors */
3400 } /* End of high-level switch statement */
3402 /* Failed to recognize the option, or syntax error */
3406 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3407 "option %s\n", arg);
3413 /* If -R or -S have been specified without -q, assume a single queue run. */
3415 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3416 queue_interval < 0) queue_interval = 0;
3420 /* If usage_wanted is set we call the usage function - which never returns */
3421 if (usage_wanted) exim_usage(called_as);
3423 /* Arguments have been processed. Check for incompatibilities. */
3425 (smtp_input || extract_recipients || recipients_arg < argc) &&
3426 (daemon_listen || queue_interval >= 0 || bi_option ||
3427 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3428 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3431 msg_action_arg > 0 &&
3432 (daemon_listen || queue_interval >= 0 || list_options ||
3433 (checking && msg_action != MSG_LOAD) ||
3434 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3437 (daemon_listen || queue_interval >= 0) &&
3438 (sender_address != NULL || list_options || list_queue || checking ||
3442 daemon_listen && queue_interval == 0
3445 inetd_wait_mode && queue_interval >= 0
3449 (checking || smtp_input || extract_recipients ||
3450 filter_test != FTEST_NONE || bi_option)
3453 verify_address_mode &&
3454 (address_test_mode || smtp_input || extract_recipients ||
3455 filter_test != FTEST_NONE || bi_option)
3458 address_test_mode && (smtp_input || extract_recipients ||
3459 filter_test != FTEST_NONE || bi_option)
3462 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3466 deliver_selectstring != NULL && queue_interval < 0
3469 msg_action == MSG_LOAD &&
3470 (!expansion_test || expansion_test_message != NULL)
3474 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3478 /* If debugging is set up, set the file and the file descriptor to pass on to
3479 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3480 to run in the foreground. */
3482 if (debug_selector != 0)
3484 debug_file = stderr;
3485 debug_fd = fileno(debug_file);
3486 background_daemon = FALSE;
3487 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3488 if (debug_selector != D_v) /* -v only doesn't show this */
3490 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3491 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3493 if (!version_printed)
3494 show_whats_supported(stderr);
3498 /* When started with root privilege, ensure that the limits on the number of
3499 open files and the number of processes (where that is accessible) are
3500 sufficiently large, or are unset, in case Exim has been called from an
3501 environment where the limits are screwed down. Not all OS have the ability to
3502 change some of these limits. */
3506 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3512 #ifdef RLIMIT_NOFILE
3513 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3515 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3517 rlp.rlim_cur = rlp.rlim_max = 0;
3520 /* I originally chose 1000 as a nice big number that was unlikely to
3521 be exceeded. It turns out that some older OS have a fixed upper limit of
3524 if (rlp.rlim_cur < 1000)
3526 rlp.rlim_cur = rlp.rlim_max = 1000;
3527 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3529 rlp.rlim_cur = rlp.rlim_max = 256;
3530 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3531 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3538 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3540 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3542 rlp.rlim_cur = rlp.rlim_max = 0;
3545 #ifdef RLIM_INFINITY
3546 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3548 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3550 if (rlp.rlim_cur < 1000)
3552 rlp.rlim_cur = rlp.rlim_max = 1000;
3554 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3555 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3561 /* Exim is normally entered as root (but some special configurations are
3562 possible that don't do this). However, it always spins off sub-processes that
3563 set their uid and gid as required for local delivery. We don't want to pass on
3564 any extra groups that root may belong to, so we want to get rid of them all at
3567 We need to obey setgroups() at this stage, before possibly giving up root
3568 privilege for a changed configuration file, but later on we might need to
3569 check on the additional groups for the admin user privilege - can't do that
3570 till after reading the config, which might specify the exim gid. Therefore,
3571 save the group list here first. */
3573 group_count = getgroups(NGROUPS_MAX, group_list);
3574 if (group_count < 0)
3576 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3580 /* There is a fundamental difference in some BSD systems in the matter of
3581 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3582 known not to be different. On the "different" systems there is a single group
3583 list, and the first entry in it is the current group. On all other versions of
3584 Unix there is a supplementary group list, which is in *addition* to the current
3585 group. Consequently, to get rid of all extraneous groups on a "standard" system
3586 you pass over 0 groups to setgroups(), while on a "different" system you pass
3587 over a single group - the current group, which is always the first group in the
3588 list. Calling setgroups() with zero groups on a "different" system results in
3589 an error return. The following code should cope with both types of system.
3591 However, if this process isn't running as root, setgroups() can't be used
3592 since you have to be root to run it, even if throwing away groups. Not being
3593 root here happens only in some unusual configurations. We just ignore the
3596 if (setgroups(0, NULL) != 0)
3598 if (setgroups(1, group_list) != 0 && !unprivileged)
3600 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3605 /* If the configuration file name has been altered by an argument on the
3606 command line (either a new file name or a macro definition) and the caller is
3607 not root, or if this is a filter testing run, remove any setuid privilege the
3608 program has and run as the underlying user.
3610 The exim user is locked out of this, which severely restricts the use of -C
3613 Otherwise, set the real ids to the effective values (should be root unless run
3614 from inetd, which it can either be root or the exim uid, if one is configured).
3616 There is a private mechanism for bypassing some of this, in order to make it
3617 possible to test lots of configurations automatically, without having either to
3618 recompile each time, or to patch in an actual configuration file name and other
3619 values (such as the path name). If running in the test harness, pretend that
3620 configuration file changes and macro definitions haven't happened. */
3623 (!trusted_config || /* Config changed, or */
3624 !macros_trusted()) && /* impermissible macros and */
3625 real_uid != root_uid && /* Not root, and */
3626 !running_in_test_harness /* Not fudged */
3628 expansion_test /* expansion testing */
3630 filter_test != FTEST_NONE) /* Filter testing */
3632 setgroups(group_count, group_list);
3633 exim_setugid(real_uid, real_gid, FALSE,
3634 US"-C, -D, -be or -bf forces real uid");
3635 removed_privilege = TRUE;
3637 /* In the normal case when Exim is called like this, stderr is available
3638 and should be used for any logging information because attempts to write
3639 to the log will usually fail. To arrange this, we unset really_exim. However,
3640 if no stderr is available there is no point - we might as well have a go
3641 at the log (if it fails, syslog will be written).
3643 Note that if the invoker is Exim, the logs remain available. Messing with
3644 this causes unlogged successful deliveries. */
3646 if ((log_stderr != NULL) && (real_uid != exim_uid))
3647 really_exim = FALSE;
3650 /* Privilege is to be retained for the moment. It may be dropped later,
3651 depending on the job that this Exim process has been asked to do. For now, set
3652 the real uid to the effective so that subsequent re-execs of Exim are done by a
3655 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3657 /* If testing a filter, open the file(s) now, before wasting time doing other
3658 setups and reading the message. */
3660 if ((filter_test & FTEST_SYSTEM) != 0)
3662 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3665 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3667 return EXIT_FAILURE;
3671 if ((filter_test & FTEST_USER) != 0)
3673 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3676 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3678 return EXIT_FAILURE;
3682 /* Initialise lookup_list
3683 If debugging, already called above via version reporting.
3684 In either case, we initialise the list of available lookups while running
3685 as root. All dynamically modules are loaded from a directory which is
3686 hard-coded into the binary and is code which, if not a module, would be
3687 part of Exim already. Ability to modify the content of the directory
3688 is equivalent to the ability to modify a setuid binary!
3690 This needs to happen before we read the main configuration. */
3693 /* Read the main runtime configuration data; this gives up if there
3694 is a failure. It leaves the configuration file open so that the subsequent
3695 configuration data for delivery can be read if needed. */
3699 /* If an action on specific messages is requested, or if a daemon or queue
3700 runner is being started, we need to know if Exim was called by an admin user.
3701 This is the case if the real user is root or exim, or if the real group is
3702 exim, or if one of the supplementary groups is exim or a group listed in
3703 admin_groups. We don't fail all message actions immediately if not admin_user,
3704 since some actions can be performed by non-admin users. Instead, set admin_user
3705 for later interrogation. */
3707 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3712 for (i = 0; i < group_count; i++)
3714 if (group_list[i] == exim_gid) admin_user = TRUE;
3715 else if (admin_groups != NULL)
3717 for (j = 1; j <= (int)(admin_groups[0]); j++)
3718 if (admin_groups[j] == group_list[i])
3719 { admin_user = TRUE; break; }
3721 if (admin_user) break;
3725 /* Another group of privileged users are the trusted users. These are root,
3726 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3727 are permitted to specify sender_addresses with -f on the command line, and
3728 other message parameters as well. */
3730 if (real_uid == root_uid || real_uid == exim_uid)
3731 trusted_caller = TRUE;
3736 if (trusted_users != NULL)
3738 for (i = 1; i <= (int)(trusted_users[0]); i++)
3739 if (trusted_users[i] == real_uid)
3740 { trusted_caller = TRUE; break; }
3743 if (!trusted_caller && trusted_groups != NULL)
3745 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3747 if (trusted_groups[i] == real_gid)
3748 trusted_caller = TRUE;
3749 else for (j = 0; j < group_count; j++)
3751 if (trusted_groups[i] == group_list[j])
3752 { trusted_caller = TRUE; break; }
3754 if (trusted_caller) break;
3759 /* Handle the decoding of logging options. */
3761 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3762 log_selector_string, log_options, log_options_count, US"log", 0);
3766 debug_printf("configuration file is %s\n", config_main_filename);
3767 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3768 log_extra_selector);
3771 /* If domain literals are not allowed, check the sender address that was
3772 supplied with -f. Ditto for a stripped trailing dot. */
3774 if (sender_address != NULL)
3776 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3778 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3779 "allowed\n", sender_address);
3780 return EXIT_FAILURE;
3782 if (f_end_dot && !strip_trailing_dot)
3784 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3785 "(trailing dot not allowed)\n", sender_address);
3786 return EXIT_FAILURE;
3790 /* See if an admin user overrode our logging. */
3792 if (cmdline_syslog_name != NULL)
3796 syslog_processname = cmdline_syslog_name;
3797 log_file_path = string_copy(CUS"syslog");
3801 /* not a panic, non-privileged users should not be able to spam paniclog */
3803 "exim: you lack sufficient privilege to specify syslog process name\n");
3804 return EXIT_FAILURE;
3808 /* Paranoia check of maximum lengths of certain strings. There is a check
3809 on the length of the log file path in log.c, which will come into effect
3810 if there are any calls to write the log earlier than this. However, if we
3811 get this far but the string is very long, it is better to stop now than to
3812 carry on and (e.g.) receive a message and then have to collapse. The call to
3813 log_write() from here will cause the ultimate panic collapse if the complete
3814 file name exceeds the buffer length. */
3816 if (Ustrlen(log_file_path) > 200)
3817 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3818 "log_file_path is longer than 200 chars: aborting");
3820 if (Ustrlen(pid_file_path) > 200)
3821 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3822 "pid_file_path is longer than 200 chars: aborting");
3824 if (Ustrlen(spool_directory) > 200)
3825 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3826 "spool_directory is longer than 200 chars: aborting");
3828 /* Length check on the process name given to syslog for its TAG field,
3829 which is only permitted to be 32 characters or less. See RFC 3164. */
3831 if (Ustrlen(syslog_processname) > 32)
3832 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3833 "syslog_processname is longer than 32 chars: aborting");
3835 /* In some operating systems, the environment variable TMPDIR controls where
3836 temporary files are created; Exim doesn't use these (apart from when delivering
3837 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3838 If TMPDIR is found in the environment, reset it to the value defined in the
3839 TMPDIR macro, if this macro is defined. */
3844 for (p = USS environ; *p != NULL; p++)
3846 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3847 Ustrcmp(*p+7, TMPDIR) != 0)
3849 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3850 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3852 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3858 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3859 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3860 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3861 called by a user who has set the TZ variable. This then affects the timestamps
3862 in log files and in Received: headers, and any created Date: header lines. The
3863 required timezone is settable in the configuration file, so nothing can be done
3864 about this earlier - but hopefully nothing will normally be logged earlier than
3865 this. We have to make a new environment if TZ is wrong, but don't bother if
3866 timestamps_utc is set, because then all times are in UTC anyway. */
3868 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3870 timestamps_utc = TRUE;
3874 uschar *envtz = US getenv("TZ");
3875 if ((envtz == NULL && timezone_string != NULL) ||
3877 (timezone_string == NULL ||
3878 Ustrcmp(timezone_string, envtz) != 0)))
3880 uschar **p = USS environ;
3884 while (*p++ != NULL) count++;
3885 if (envtz == NULL) count++;
3886 newp = new = malloc(sizeof(uschar *) * (count + 1));
3887 for (p = USS environ; *p != NULL; p++)
3889 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3892 if (timezone_string != NULL)
3894 *newp = malloc(Ustrlen(timezone_string) + 4);
3895 sprintf(CS *newp++, "TZ=%s", timezone_string);
3900 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3901 tod_stamp(tod_log));
3905 /* Handle the case when we have removed the setuid privilege because of -C or
3906 -D. This means that the caller of Exim was not root.
3908 There is a problem if we were running as the Exim user. The sysadmin may
3909 expect this case to retain privilege because "the binary was called by the
3910 Exim user", but it hasn't, because either the -D option set macros, or the
3911 -C option set a non-trusted configuration file. There are two possibilities:
3913 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3914 to do message deliveries. Thus, the fact that it is running as a
3915 non-privileged user is plausible, and might be wanted in some special
3916 configurations. However, really_exim will have been set false when
3917 privilege was dropped, to stop Exim trying to write to its normal log
3918 files. Therefore, re-enable normal log processing, assuming the sysadmin
3919 has set up the log directory correctly.
3921 (2) If deliver_drop_privilege is not set, the configuration won't work as
3922 apparently intended, and so we log a panic message. In order to retain
3923 root for -C or -D, the caller must either be root or be invoking a
3924 trusted configuration file (when deliver_drop_privilege is false). */
3926 if (removed_privilege && (!trusted_config || macros != NULL) &&
3927 real_uid == exim_uid)
3929 if (deliver_drop_privilege)
3930 really_exim = TRUE; /* let logging work normally */
3932 log_write(0, LOG_MAIN|LOG_PANIC,
3933 "exim user lost privilege for using %s option",
3934 trusted_config? "-D" : "-C");
3937 /* Start up Perl interpreter if Perl support is configured and there is a
3938 perl_startup option, and the configuration or the command line specifies
3939 initializing starting. Note that the global variables are actually called
3940 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3943 if (perl_start_option != 0)
3944 opt_perl_at_start = (perl_start_option > 0);
3945 if (opt_perl_at_start && opt_perl_startup != NULL)
3948 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3949 errstr = init_perl(opt_perl_startup);
3952 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3953 return EXIT_FAILURE;
3955 opt_perl_started = TRUE;
3957 #endif /* EXIM_PERL */
3959 /* Log the arguments of the call if the configuration file said so. This is
3960 a debugging feature for finding out what arguments certain MUAs actually use.
3961 Don't attempt it if logging is disabled, or if listing variables or if
3962 verifying/testing addresses or expansions. */
3964 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3965 && really_exim && !list_options && !checking)
3968 uschar *p = big_buffer;
3970 Ustrcpy(p, "cwd= (failed)");
3971 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3973 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3975 for (i = 0; i < argc; i++)
3977 int len = Ustrlen(argv[i]);
3980 if (p + len + 8 >= big_buffer + big_buffer_size)
3983 log_write(0, LOG_MAIN, "%s", big_buffer);
3984 Ustrcpy(big_buffer, "...");
3987 printing = string_printing(argv[i]);
3988 if (printing[0] == 0) quote = US"\""; else
3990 uschar *pp = printing;
3992 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3994 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3995 (p - big_buffer) - 4), printing, quote);
3999 if ((log_extra_selector & LX_arguments) != 0)
4000 log_write(0, LOG_MAIN, "%s", big_buffer);
4002 debug_printf("%s\n", big_buffer);
4005 /* Set the working directory to be the top-level spool directory. We don't rely
4006 on this in the code, which always uses fully qualified names, but it's useful
4007 for core dumps etc. Don't complain if it fails - the spool directory might not
4008 be generally accessible and calls with the -C option (and others) have lost
4009 privilege by now. Before the chdir, we try to ensure that the directory exists.
4012 if (Uchdir(spool_directory) != 0)
4015 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4016 dummy = /* quieten compiler */ Uchdir(spool_directory);
4019 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4020 alias file. Exim doesn't have such a concept, but this call is screwed into
4021 Sun's YP makefiles. Handle this by calling a configured script, as the real
4022 user who called Exim. The -oA option can be used to pass an argument to the
4027 (void)fclose(config_file);
4028 if (bi_command != NULL)
4032 argv[i++] = bi_command;
4033 if (alias_arg != NULL) argv[i++] = alias_arg;
4036 setgroups(group_count, group_list);
4037 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4039 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4040 (argv[1] == NULL)? US"" : argv[1]);
4042 execv(CS argv[0], (char *const *)argv);
4043 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4048 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4053 /* We moved the admin/trusted check to be immediately after reading the
4054 configuration file. We leave these prints here to ensure that syslog setup,
4055 logfile setup, and so on has already happened. */
4057 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4058 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4060 /* Only an admin user may start the daemon or force a queue run in the default
4061 configuration, but the queue run restriction can be relaxed. Only an admin
4062 user may request that a message be returned to its sender forthwith. Only an
4063 admin user may specify a debug level greater than D_v (because it might show
4064 passwords, etc. in lookup queries). Only an admin user may request a queue
4065 count. Only an admin user can use the test interface to scan for email
4066 (because Exim will be in the spool dir and able to look at mails). */
4070 BOOL debugset = (debug_selector & ~D_v) != 0;
4071 if (deliver_give_up || daemon_listen || malware_test_file ||
4072 (count_queue && queue_list_requires_admin) ||
4073 (list_queue && queue_list_requires_admin) ||
4074 (queue_interval >= 0 && prod_requires_admin) ||
4075 (debugset && !running_in_test_harness))
4077 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4082 /* If the real user is not root or the exim uid, the argument for passing
4083 in an open TCP/IP connection for another message is not permitted, nor is
4084 running with the -N option for any delivery action, unless this call to exim is
4085 one that supplied an input message, or we are using a patched exim for
4086 regression testing. */
4088 if (real_uid != root_uid && real_uid != exim_uid &&
4089 (continue_hostname != NULL ||
4091 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4092 )) && !running_in_test_harness)
4094 fprintf(stderr, "exim: Permission denied\n");
4095 return EXIT_FAILURE;
4098 /* If the caller is not trusted, certain arguments are ignored when running for
4099 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4100 Note that authority for performing certain actions on messages is tested in the
4101 queue_action() function. */
4103 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4105 sender_host_name = sender_host_address = interface_address =
4106 sender_ident = received_protocol = NULL;
4107 sender_host_port = interface_port = 0;
4108 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4111 /* If a sender host address is set, extract the optional port number off the
4112 end of it and check its syntax. Do the same thing for the interface address.
4113 Exim exits if the syntax is bad. */
4117 if (sender_host_address != NULL)
4118 sender_host_port = check_port(sender_host_address);
4119 if (interface_address != NULL)
4120 interface_port = check_port(interface_address);
4123 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4128 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4129 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4133 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4134 return EXIT_FAILURE;
4138 /* If an SMTP message is being received check to see if the standard input is a
4139 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4140 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4145 union sockaddr_46 inetd_sock;
4146 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4147 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4149 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4150 if (family == AF_INET || family == AF_INET6)
4152 union sockaddr_46 interface_sock;
4153 size = sizeof(interface_sock);
4155 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4156 interface_address = host_ntoa(-1, &interface_sock, NULL,
4159 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4161 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4164 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4165 NULL, &sender_host_port);
4166 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4167 "inetd is not supported when mua_wrapper is set");
4172 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4173 return EXIT_FAILURE;
4179 /* If the load average is going to be needed while receiving a message, get it
4180 now for those OS that require the first call to os_getloadavg() to be done as
4181 root. There will be further calls later for each message received. */
4183 #ifdef LOAD_AVG_NEEDS_ROOT
4184 if (receiving_message &&
4185 (queue_only_load >= 0 ||
4186 (is_inetd && smtp_load_reserve >= 0)
4189 load_average = OS_GETLOADAVG();
4193 /* The queue_only configuration option can be overridden by -odx on the command
4194 line, except that if queue_only_override is false, queue_only cannot be unset
4195 from the command line. */
4197 if (queue_only_set && (queue_only_override || arg_queue_only))
4198 queue_only = arg_queue_only;
4200 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4203 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4204 if (arg_smtp_receive_timeout >= 0)
4205 smtp_receive_timeout = arg_smtp_receive_timeout;
4207 /* If Exim was started with root privilege, unless we have already removed the
4208 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4209 except when starting the daemon or doing some kind of delivery or address
4210 testing (-bt). These are the only cases when root need to be retained. We run
4211 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4212 retained only for starting the daemon. We always do the initgroups() in this
4213 situation (controlled by the TRUE below), in order to be as close as possible
4214 to the state Exim usually runs in. */
4216 if (!unprivileged && /* originally had root AND */
4217 !removed_privilege && /* still got root AND */
4218 !daemon_listen && /* not starting the daemon */
4219 queue_interval <= 0 && /* (either kind of daemon) */
4221 deliver_drop_privilege || /* requested unprivileged */
4223 queue_interval < 0 && /* not running the queue */
4224 (msg_action_arg < 0 || /* and */
4225 msg_action != MSG_DELIVER) && /* not delivering and */
4226 (!checking || !address_test_mode) /* not address checking */
4230 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4233 /* When we are retaining a privileged uid, we still change to the exim gid. */
4238 rv = setgid(exim_gid);
4239 /* Impact of failure is that some stuff might end up with an incorrect group.
4240 We track this for failures from root, since any attempt to change privilege
4241 by root should succeed and failures should be examined. For non-root,
4242 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4243 no need to complain then. */
4246 if (!(unprivileged || removed_privilege))
4249 "exim: changing group failed: %s\n", strerror(errno));
4253 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4254 (long int)exim_gid, strerror(errno));
4258 /* Handle a request to scan a file for malware */
4259 if (malware_test_file)
4261 #ifdef WITH_CONTENT_SCAN
4263 set_process_info("scanning file for malware");
4264 result = malware_in_file(malware_test_file);
4267 printf("No malware found.\n");
4272 printf("Malware lookup returned non-okay/fail: %d\n", result);
4276 printf("Malware found: %s\n", malware_name);
4278 printf("Malware scan detected malware of unknown name.\n");
4280 printf("Malware scanning not enabled at compile time.\n");
4285 /* Handle a request to list the delivery queue */
4289 set_process_info("listing the queue");
4290 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4294 /* Handle a request to count the delivery queue */
4298 set_process_info("counting the queue");
4303 /* Handle actions on specific messages, except for the force delivery and
4304 message load actions, which are done below. Some actions take a whole list of
4305 message ids, which are known to continue up to the end of the arguments. Others
4306 take a single message id and then operate on the recipients list. */
4308 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4310 int yield = EXIT_SUCCESS;
4311 set_process_info("acting on specified messages");
4313 if (!one_msg_action)
4315 for (i = msg_action_arg; i < argc; i++)
4316 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4317 yield = EXIT_FAILURE;
4320 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4321 recipients_arg)) yield = EXIT_FAILURE;
4325 /* We used to set up here to skip reading the ACL section, on
4326 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4327 Now, since the intro of the ${acl } expansion, ACL definitions may be
4328 needed in transports so we lost the optimisation. */
4332 /* The configuration data will have been read into POOL_PERM because we won't
4333 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4334 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4335 configuration were read into POOL_MAIN, because we don't do any resets till
4336 later on. However, it seems right, and it does ensure that both pools get used.
4339 store_pool = POOL_MAIN;
4341 /* Handle the -brt option. This is for checking out retry configurations.
4342 The next three arguments are a domain name or a complete address, and
4343 optionally two error numbers. All it does is to call the function that
4344 scans the retry configuration data. */
4346 if (test_retry_arg >= 0)
4348 retry_config *yield;
4349 int basic_errno = 0;
4353 if (test_retry_arg >= argc)
4355 printf("-brt needs a domain or address argument\n");
4356 exim_exit(EXIT_FAILURE);
4358 s1 = argv[test_retry_arg++];
4361 /* If the first argument contains no @ and no . it might be a local user
4362 or it might be a single-component name. Treat as a domain. */
4364 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4366 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4367 "being \ntreated as a one-component domain, not as a local part.\n\n",
4371 /* There may be an optional second domain arg. */
4373 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4374 s2 = argv[test_retry_arg++];
4376 /* The final arg is an error name */
4378 if (test_retry_arg < argc)
4380 uschar *ss = argv[test_retry_arg];
4382 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4385 printf("%s\n", CS error);
4386 return EXIT_FAILURE;
4389 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4390 code > 100 as an error is for matching codes to the decade. Turn them into
4391 a real error code, off the decade. */
4393 if (basic_errno == ERRNO_MAIL4XX ||
4394 basic_errno == ERRNO_RCPT4XX ||
4395 basic_errno == ERRNO_DATA4XX)
4397 int code = (more_errno >> 8) & 255;
4399 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4400 else if (code > 100)
4401 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4405 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4406 if (yield == NULL) printf("No retry information found\n"); else
4409 more_errno = yield->more_errno;
4410 printf("Retry rule: %s ", yield->pattern);
4412 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4414 printf("quota%s%s ",
4415 (more_errno > 0)? "_" : "",
4416 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4418 else if (yield->basic_errno == ECONNREFUSED)
4420 printf("refused%s%s ",
4421 (more_errno > 0)? "_" : "",
4422 (more_errno == 'M')? "MX" :
4423 (more_errno == 'A')? "A" : "");
4425 else if (yield->basic_errno == ETIMEDOUT)
4428 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4430 if (more_errno != 0) printf("_%s",
4431 (more_errno == 'M')? "MX" : "A");
4434 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4435 printf("auth_failed ");
4438 for (r = yield->rules; r != NULL; r = r->next)
4440 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4441 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4447 printf(",%d.", x/1000);
4461 exim_exit(EXIT_SUCCESS);
4464 /* Handle a request to list one or more configuration options */
4465 /* If -n was set, we suppress some information */
4469 set_process_info("listing variables");
4470 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4471 else for (i = recipients_arg; i < argc; i++)
4474 (Ustrcmp(argv[i], "router") == 0 ||
4475 Ustrcmp(argv[i], "transport") == 0 ||
4476 Ustrcmp(argv[i], "authenticator") == 0 ||
4477 Ustrcmp(argv[i], "macro") == 0))
4479 readconf_print(argv[i+1], argv[i], flag_n);
4482 else readconf_print(argv[i], NULL, flag_n);
4484 exim_exit(EXIT_SUCCESS);
4488 /* Handle a request to deliver one or more messages that are already on the
4489 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4490 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4492 Delivery of specific messages is typically used for a small number when
4493 prodding by hand (when the option forced_delivery will be set) or when
4494 re-execing to regain root privilege. Each message delivery must happen in a
4495 separate process, so we fork a process for each one, and run them sequentially
4496 so that debugging output doesn't get intertwined, and to avoid spawning too
4497 many processes if a long list is given. However, don't fork for the last one;
4498 this saves a process in the common case when Exim is called to deliver just one
4501 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4503 if (prod_requires_admin && !admin_user)
4505 fprintf(stderr, "exim: Permission denied\n");
4506 exim_exit(EXIT_FAILURE);
4508 set_process_info("delivering specified messages");
4509 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4510 for (i = msg_action_arg; i < argc; i++)
4515 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4516 else if ((pid = fork()) == 0)
4518 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4519 _exit(EXIT_SUCCESS);
4523 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4525 exim_exit(EXIT_FAILURE);
4529 exim_exit(EXIT_SUCCESS);
4533 /* If only a single queue run is requested, without SMTP listening, we can just
4534 turn into a queue runner, with an optional starting message id. */
4536 if (queue_interval == 0 && !daemon_listen)
4538 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4539 (start_queue_run_id == NULL)? US"" : US" starting at ",
4540 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4541 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4542 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4543 set_process_info("running the queue (single queue run)");
4544 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4545 exim_exit(EXIT_SUCCESS);
4549 /* Find the login name of the real user running this process. This is always
4550 needed when receiving a message, because it is written into the spool file. It
4551 may also be used to construct a from: or a sender: header, and in this case we
4552 need the user's full name as well, so save a copy of it, checked for RFC822
4553 syntax and munged if necessary, if it hasn't previously been set by the -F
4554 argument. We may try to get the passwd entry more than once, in case NIS or
4555 other delays are in evidence. Save the home directory for use in filter testing
4560 if ((pw = getpwuid(real_uid)) != NULL)
4562 originator_login = string_copy(US pw->pw_name);
4563 originator_home = string_copy(US pw->pw_dir);
4565 /* If user name has not been set by -F, set it from the passwd entry
4566 unless -f has been used to set the sender address by a trusted user. */
4568 if (originator_name == NULL)
4570 if (sender_address == NULL ||
4571 (!trusted_caller && filter_test == FTEST_NONE))
4573 uschar *name = US pw->pw_gecos;
4574 uschar *amp = Ustrchr(name, '&');
4577 /* Most Unix specify that a '&' character in the gecos field is
4578 replaced by a copy of the login name, and some even specify that
4579 the first character should be upper cased, so that's what we do. */
4584 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4585 amp - name, name, &loffset, originator_login, amp + 1);
4586 buffer[loffset] = toupper(buffer[loffset]);
4590 /* If a pattern for matching the gecos field was supplied, apply
4591 it and then expand the name string. */
4593 if (gecos_pattern != NULL && gecos_name != NULL)
4596 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4598 if (regex_match_and_setup(re, name, 0, -1))
4600 uschar *new_name = expand_string(gecos_name);
4602 if (new_name != NULL)
4604 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4605 "gecos field \"%s\"\n", new_name, name);
4608 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4609 "\"%s\": %s\n", gecos_name, expand_string_message);
4611 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4612 "gecos field \"%s\"\n", gecos_pattern, name);
4613 store_free((void *)re);
4615 originator_name = string_copy(name);
4618 /* A trusted caller has used -f but not -F */
4620 else originator_name = US"";
4623 /* Break the retry loop */
4628 if (++i > finduser_retries) break;
4632 /* If we cannot get a user login, log the incident and give up, unless the
4633 configuration specifies something to use. When running in the test harness,
4634 any setting of unknown_login overrides the actual name. */
4636 if (originator_login == NULL || running_in_test_harness)
4638 if (unknown_login != NULL)
4640 originator_login = expand_string(unknown_login);
4641 if (originator_name == NULL && unknown_username != NULL)
4642 originator_name = expand_string(unknown_username);
4643 if (originator_name == NULL) originator_name = US"";
4645 if (originator_login == NULL)
4646 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4650 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4653 originator_name = string_copy(parse_fix_phrase(originator_name,
4654 Ustrlen(originator_name), big_buffer, big_buffer_size));
4656 /* If a message is created by this call of Exim, the uid/gid of its originator
4657 are those of the caller. These values are overridden if an existing message is
4658 read in from the spool. */
4660 originator_uid = real_uid;
4661 originator_gid = real_gid;
4663 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4664 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4666 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4667 returns. We leave this till here so that the originator_ fields are available
4668 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4671 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4675 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4676 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4677 "mua_wrapper is set");
4682 /* If the sender ident has not been set (by a trusted caller) set it to
4683 the caller. This will get overwritten below for an inetd call. If a trusted
4684 caller has set it empty, unset it. */
4686 if (sender_ident == NULL) sender_ident = originator_login;
4687 else if (sender_ident[0] == 0) sender_ident = NULL;
4689 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4690 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4691 originator_* variables set. */
4693 if (test_rewrite_arg >= 0)
4695 really_exim = FALSE;
4696 if (test_rewrite_arg >= argc)
4698 printf("-brw needs an address argument\n");
4699 exim_exit(EXIT_FAILURE);
4701 rewrite_test(argv[test_rewrite_arg]);
4702 exim_exit(EXIT_SUCCESS);
4705 /* A locally-supplied message is considered to be coming from a local user
4706 unless a trusted caller supplies a sender address with -f, or is passing in the
4707 message via SMTP (inetd invocation or otherwise). */
4709 if ((sender_address == NULL && !smtp_input) ||
4710 (!trusted_caller && filter_test == FTEST_NONE))
4712 sender_local = TRUE;
4714 /* A trusted caller can supply authenticated_sender and authenticated_id
4715 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4716 defaults except when host checking. */
4718 if (authenticated_sender == NULL && !host_checking)
4719 authenticated_sender = string_sprintf("%s@%s", originator_login,
4720 qualify_domain_sender);
4721 if (authenticated_id == NULL && !host_checking)
4722 authenticated_id = originator_login;
4725 /* Trusted callers are always permitted to specify the sender address.
4726 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4727 is specified is the empty address. However, if a trusted caller does not
4728 specify a sender address for SMTP input, we leave sender_address unset. This
4729 causes the MAIL commands to be honoured. */
4731 if ((!smtp_input && sender_address == NULL) ||
4732 !receive_check_set_sender(sender_address))
4734 /* Either the caller is not permitted to set a general sender, or this is
4735 non-SMTP input and the trusted caller has not set a sender. If there is no
4736 sender, or if a sender other than <> is set, override with the originator's
4737 login (which will get qualified below), except when checking things. */
4739 if (sender_address == NULL /* No sender_address set */
4741 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4742 !checking && /* Not running tests, AND */
4743 filter_test == FTEST_NONE)) /* Not testing a filter */
4745 sender_address = originator_login;
4746 sender_address_forced = FALSE;
4747 sender_address_domain = 0;
4751 /* Remember whether an untrusted caller set the sender address */
4753 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4755 /* Ensure that the sender address is fully qualified unless it is the empty
4756 address, which indicates an error message, or doesn't exist (root caller, smtp
4757 interface, no -f argument). */
4759 if (sender_address != NULL && sender_address[0] != 0 &&
4760 sender_address_domain == 0)
4761 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4762 qualify_domain_sender);
4764 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4766 /* Handle a request to verify a list of addresses, or test them for delivery.
4767 This must follow the setting of the sender address, since routers can be
4768 predicated upon the sender. If no arguments are given, read addresses from
4769 stdin. Set debug_level to at least D_v to get full output for address testing.
4772 if (verify_address_mode || address_test_mode)
4775 int flags = vopt_qualify;
4777 if (verify_address_mode)
4779 if (!verify_as_sender) flags |= vopt_is_recipient;
4780 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4785 flags |= vopt_is_recipient;
4786 debug_selector |= D_v;
4787 debug_file = stderr;
4788 debug_fd = fileno(debug_file);
4789 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4792 if (recipients_arg < argc)
4794 while (recipients_arg < argc)
4796 uschar *s = argv[recipients_arg++];
4799 BOOL finished = FALSE;
4800 uschar *ss = parse_find_address_end(s, FALSE);
4801 if (*ss == ',') *ss = 0; else finished = TRUE;
4802 test_address(s, flags, &exit_value);
4805 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4812 uschar *s = get_stdinput(NULL, NULL);
4813 if (s == NULL) break;
4814 test_address(s, flags, &exit_value);
4818 exim_exit(exit_value);
4821 /* Handle expansion checking. Either expand items on the command line, or read
4822 from stdin if there aren't any. If -Mset was specified, load the message so
4823 that its variables can be used, but restrict this facility to admin users.
4824 Otherwise, if -bem was used, read a message from stdin. */
4828 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4830 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4833 fprintf(stderr, "exim: permission denied\n");
4836 message_id = argv[msg_action_arg];
4837 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4838 if (!spool_open_datafile(message_id))
4839 printf ("Failed to load message datafile %s\n", message_id);
4840 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4841 printf ("Failed to load message %s\n", message_id);
4844 /* Read a test message from a file. We fudge it up to be on stdin, saving
4845 stdin itself for later reading of expansion strings. */
4847 else if (expansion_test_message != NULL)
4849 int save_stdin = dup(0);
4850 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4853 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4855 return EXIT_FAILURE;
4858 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4859 message_ended = END_NOTENDED;
4860 read_message_body(receive_msg(extract_recipients));
4861 message_linecount += body_linecount;
4862 (void)dup2(save_stdin, 0);
4863 (void)close(save_stdin);
4864 clearerr(stdin); /* Required by Darwin */
4867 /* Allow $recipients for this testing */
4869 enable_dollar_recipients = TRUE;
4871 /* Expand command line items */
4873 if (recipients_arg < argc)
4875 while (recipients_arg < argc)
4877 uschar *s = argv[recipients_arg++];
4878 uschar *ss = expand_string(s);
4879 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4880 else printf("%s\n", CS ss);
4888 char *(*fn_readline)(const char *) = NULL;
4889 void (*fn_addhist)(const char *) = NULL;
4892 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4898 uschar *source = get_stdinput(fn_readline, fn_addhist);
4899 if (source == NULL) break;
4900 ss = expand_string(source);
4902 printf ("Failed: %s\n", expand_string_message);
4903 else printf("%s\n", CS ss);
4907 if (dlhandle != NULL) dlclose(dlhandle);
4911 /* The data file will be open after -Mset */
4913 if (deliver_datafile >= 0)
4915 (void)close(deliver_datafile);
4916 deliver_datafile = -1;
4919 exim_exit(EXIT_SUCCESS);
4923 /* The active host name is normally the primary host name, but it can be varied
4924 for hosts that want to play several parts at once. We need to ensure that it is
4925 set for host checking, and for receiving messages. */
4927 smtp_active_hostname = primary_hostname;
4928 if (raw_active_hostname != NULL)
4930 uschar *nah = expand_string(raw_active_hostname);
4933 if (!expand_string_forcedfail)
4934 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4935 "(smtp_active_hostname): %s", raw_active_hostname,
4936 expand_string_message);
4938 else if (nah[0] != 0) smtp_active_hostname = nah;
4941 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4942 given IP address so that the blocking and relay configuration can be tested.
4943 Unless a sender_ident was set by -oMt, we discard it (the default is the
4944 caller's login name). An RFC 1413 call is made only if we are running in the
4945 test harness and an incoming interface and both ports are specified, because
4946 there is no TCP/IP call to find the ident for. */
4953 if (!sender_ident_set)
4955 sender_ident = NULL;
4956 if (running_in_test_harness && sender_host_port != 0 &&
4957 interface_address != NULL && interface_port != 0)
4958 verify_get_ident(1413);
4961 /* In case the given address is a non-canonical IPv6 address, canonicize
4962 it. The code works for both IPv4 and IPv6, as it happens. */
4964 size = host_aton(sender_host_address, x);
4965 sender_host_address = store_get(48); /* large enough for full IPv6 */
4966 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4968 /* Now set up for testing */
4970 host_build_sender_fullhost();
4974 sender_local = FALSE;
4975 sender_host_notsocket = TRUE;
4976 debug_file = stderr;
4977 debug_fd = fileno(debug_file);
4978 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4979 "**** but without any ident (RFC 1413) callback.\n"
4980 "**** This is not for real!\n\n",
4981 sender_host_address);
4983 if (verify_check_host(&hosts_connection_nolog) == OK)
4984 log_write_selector &= ~L_smtp_connection;
4985 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4987 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4988 because a log line has already been written for all its failure exists
4989 (usually "connection refused: <reason>") and writing another one is
4990 unnecessary clutter. */
4992 if (smtp_start_session())
4994 reset_point = store_get(0);
4997 store_reset(reset_point);
4998 if (smtp_setup_msg() <= 0) break;
4999 if (!receive_msg(FALSE)) break;
5003 exim_exit(EXIT_SUCCESS);
5007 /* Arrange for message reception if recipients or SMTP were specified;
5008 otherwise complain unless a version print (-bV) happened or this is a filter
5009 verification test or info dump.
5010 In the former case, show the configuration file name. */
5012 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5014 if (version_printed)
5016 printf("Configuration file is %s\n", config_main_filename);
5017 return EXIT_SUCCESS;
5020 if (info_flag != CMDINFO_NONE)
5022 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5023 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5026 if (filter_test == FTEST_NONE)
5027 exim_usage(called_as);
5031 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5032 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5033 that we are not called from inetd, because that is rejected above. The
5034 following configuration settings are forced here:
5036 (1) Synchronous delivery (-odi)
5037 (2) Errors to stderr (-oep == -oeq)
5038 (3) No parallel remote delivery
5039 (4) Unprivileged delivery
5041 We don't force overall queueing options because there are several of them;
5042 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5043 to override any SMTP queueing. */
5047 synchronous_delivery = TRUE;
5048 arg_error_handling = ERRORS_STDERR;
5049 remote_max_parallel = 1;
5050 deliver_drop_privilege = TRUE;
5052 queue_smtp_domains = NULL;
5056 /* Prepare to accept one or more new messages on the standard input. When a
5057 message has been read, its id is returned in message_id[]. If doing immediate
5058 delivery, we fork a delivery process for each received message, except for the
5059 last one, where we can save a process switch.
5061 It is only in non-smtp mode that error_handling is allowed to be changed from
5062 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5063 sendmail error modes other than -oem ever actually used? Later: yes.) */
5065 if (!smtp_input) error_handling = arg_error_handling;
5067 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5068 logging being sent down the socket and make an identd call to get the
5073 (void)fclose(stderr);
5074 exim_nullstd(); /* Re-open to /dev/null */
5075 verify_get_ident(IDENT_PORT);
5076 host_build_sender_fullhost();
5077 set_process_info("handling incoming connection from %s via inetd",
5081 /* If the sender host address has been set, build sender_fullhost if it hasn't
5082 already been done (which it will have been for inetd). This caters for the
5083 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5084 so that the test for IP options is skipped for -bs input. */
5086 if (sender_host_address != NULL && sender_fullhost == NULL)
5088 host_build_sender_fullhost();
5089 set_process_info("handling incoming connection from %s via -oMa",
5091 sender_host_notsocket = TRUE;
5094 /* Otherwise, set the sender host as unknown except for inetd calls. This
5095 prevents host checking in the case of -bs not from inetd and also for -bS. */
5097 else if (!is_inetd) sender_host_unknown = TRUE;
5099 /* If stdout does not exist, then dup stdin to stdout. This can happen
5100 if exim is started from inetd. In this case fd 0 will be set to the socket,
5101 but fd 1 will not be set. This also happens for passed SMTP channels. */
5103 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5105 /* Set up the incoming protocol name and the state of the program. Root is
5106 allowed to force received protocol via the -oMr option above. If we have come
5107 via inetd, the process info has already been set up. We don't set
5108 received_protocol here for smtp input, as it varies according to
5109 batch/HELO/EHLO/AUTH/TLS. */
5113 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5114 smtp_batched_input? "batched " : "",
5115 (sender_address!= NULL)? sender_address : originator_login);
5119 if (received_protocol == NULL)
5120 received_protocol = string_sprintf("local%s", called_as);
5121 set_process_info("accepting a local non-SMTP message from <%s>",
5125 /* Initialize the session_local_queue-only flag (this will be ignored if
5126 mua_wrapper is set) */
5129 session_local_queue_only = queue_only;
5131 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5132 the spool if so configured. On failure, we must not attempt to send an error
5133 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5134 error code is given.) */
5136 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5138 fprintf(stderr, "exim: insufficient disk space\n");
5139 return EXIT_FAILURE;
5142 /* If this is smtp input of any kind, real or batched, handle the start of the
5145 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5146 because a log line has already been written for all its failure exists
5147 (usually "connection refused: <reason>") and writing another one is
5148 unnecessary clutter. */
5154 if (verify_check_host(&hosts_connection_nolog) == OK)
5155 log_write_selector &= ~L_smtp_connection;
5156 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5157 if (!smtp_start_session())
5160 exim_exit(EXIT_SUCCESS);
5164 /* Otherwise, set up the input size limit here. */
5168 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5169 if (expand_string_message != NULL)
5171 if (thismessage_size_limit == -1)
5172 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5173 "message_size_limit: %s", expand_string_message);
5175 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5176 "message_size_limit: %s", expand_string_message);
5180 /* Loop for several messages when reading SMTP input. If we fork any child
5181 processes, we don't want to wait for them unless synchronous delivery is
5182 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5183 same as SIG_DFL, despite the fact that documentation often lists the default as
5184 "ignore". This is a confusing area. This is what I know:
5186 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5187 processes that complete simply to go away without ever becoming defunct. You
5188 can't then wait for them - but we don't want to wait for them in the
5189 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5190 happen for all OS (e.g. *BSD is different).
5192 But that's not the end of the story. Some (many? all?) systems have the
5193 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5194 has by default, so it seems that the difference is merely one of default
5195 (compare restarting vs non-restarting signals).
5197 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5198 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5199 of the loop below. Paranoia rules.
5201 February 2003: That's *still* not the end of the story. There are now versions
5202 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5203 process then calls waitpid(), a grumble is written to the system log, because
5204 this is logically inconsistent. In other words, it doesn't like the paranoia.
5205 As a consequenc of this, the waitpid() below is now excluded if we are sure
5206 that SIG_IGN works. */
5208 if (!synchronous_delivery)
5211 struct sigaction act;
5212 act.sa_handler = SIG_IGN;
5213 sigemptyset(&(act.sa_mask));
5214 act.sa_flags = SA_NOCLDWAIT;
5215 sigaction(SIGCHLD, &act, NULL);
5217 signal(SIGCHLD, SIG_IGN);
5221 /* Save the current store pool point, for resetting at the start of
5222 each message, and save the real sender address, if any. */
5224 reset_point = store_get(0);
5225 real_sender_address = sender_address;
5227 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5228 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5233 store_reset(reset_point);
5236 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5237 input and build the recipients list, before calling receive_msg() to read the
5238 message proper. Whatever sender address is given in the SMTP transaction is
5239 often ignored for local senders - we use the actual sender, which is normally
5240 either the underlying user running this process or a -f argument provided by
5241 a trusted caller. It is saved in real_sender_address. The test for whether to
5242 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5247 if ((rc = smtp_setup_msg()) > 0)
5249 if (real_sender_address != NULL &&
5250 !receive_check_set_sender(sender_address))
5252 sender_address = raw_sender = real_sender_address;
5253 sender_address_unrewritten = NULL;
5256 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5257 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5258 the very end. The result of the ACL is ignored (as for other non-SMTP
5259 messages). It is run for its potential side effects. */
5261 if (smtp_batched_input && acl_not_smtp_start != NULL)
5263 uschar *user_msg, *log_msg;
5264 enable_dollar_recipients = TRUE;
5265 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5266 &user_msg, &log_msg);
5267 enable_dollar_recipients = FALSE;
5270 /* Now get the data for the message */
5272 more = receive_msg(extract_recipients);
5273 if (message_id[0] == 0)
5276 smtp_log_no_mail(); /* Log no mail if configured */
5277 exim_exit(EXIT_FAILURE);
5282 smtp_log_no_mail(); /* Log no mail if configured */
5283 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5287 /* In the non-SMTP case, we have all the information from the command
5288 line, but must process it in case it is in the more general RFC822
5289 format, and in any case, to detect syntax errors. Also, it appears that
5290 the use of comma-separated lists as single arguments is common, so we
5291 had better support them. */
5297 int count = argc - recipients_arg;
5298 uschar **list = argv + recipients_arg;
5300 /* These options cannot be changed dynamically for non-SMTP messages */
5302 active_local_sender_retain = local_sender_retain;
5303 active_local_from_check = local_from_check;
5305 /* Save before any rewriting */
5307 raw_sender = string_copy(sender_address);
5309 /* Loop for each argument */
5311 for (i = 0; i < count; i++)
5313 int start, end, domain;
5315 uschar *s = list[i];
5317 /* Loop for each comma-separated address */
5321 BOOL finished = FALSE;
5323 uschar *ss = parse_find_address_end(s, FALSE);
5325 if (*ss == ',') *ss = 0; else finished = TRUE;
5327 /* Check max recipients - if -t was used, these aren't recipients */
5329 if (recipients_max > 0 && ++rcount > recipients_max &&
5330 !extract_recipients)
5332 if (error_handling == ERRORS_STDERR)
5334 fprintf(stderr, "exim: too many recipients\n");
5335 exim_exit(EXIT_FAILURE);
5340 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5341 errors_sender_rc : EXIT_FAILURE;
5346 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5348 if (domain == 0 && !allow_unqualified_recipient)
5351 errmess = US"unqualified recipient address not allowed";
5354 if (recipient == NULL)
5356 if (error_handling == ERRORS_STDERR)
5358 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5359 string_printing(list[i]), errmess);
5360 exim_exit(EXIT_FAILURE);
5366 eblock.text1 = string_printing(list[i]);
5367 eblock.text2 = errmess;
5369 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5370 errors_sender_rc : EXIT_FAILURE;
5374 receive_add_recipient(recipient, -1);
5377 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5381 /* Show the recipients when debugging */
5386 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5387 if (recipients_list != NULL)
5389 debug_printf("Recipients:\n");
5390 for (i = 0; i < recipients_count; i++)
5391 debug_printf(" %s\n", recipients_list[i].address);
5395 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5396 ignored; rejecting here would just add complication, and it can just as
5397 well be done later. Allow $recipients to be visible in the ACL. */
5399 if (acl_not_smtp_start != NULL)
5401 uschar *user_msg, *log_msg;
5402 enable_dollar_recipients = TRUE;
5403 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5404 &user_msg, &log_msg);
5405 enable_dollar_recipients = FALSE;
5408 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5409 will just read the headers for the message, and not write anything onto the
5412 message_ended = END_NOTENDED;
5413 more = receive_msg(extract_recipients);
5415 /* more is always FALSE here (not SMTP message) when reading a message
5416 for real; when reading the headers of a message for filter testing,
5417 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5419 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5420 } /* Non-SMTP message reception */
5422 /* If this is a filter testing run, there are headers in store, but
5423 no message on the spool. Run the filtering code in testing mode, setting
5424 the domain to the qualify domain and the local part to the current user,
5425 unless they have been set by options. The prefix and suffix are left unset
5426 unless specified. The the return path is set to to the sender unless it has
5427 already been set from a return-path header in the message. */
5429 if (filter_test != FTEST_NONE)
5431 deliver_domain = (ftest_domain != NULL)?
5432 ftest_domain : qualify_domain_recipient;
5433 deliver_domain_orig = deliver_domain;
5434 deliver_localpart = (ftest_localpart != NULL)?
5435 ftest_localpart : originator_login;
5436 deliver_localpart_orig = deliver_localpart;
5437 deliver_localpart_prefix = ftest_prefix;
5438 deliver_localpart_suffix = ftest_suffix;
5439 deliver_home = originator_home;
5441 if (return_path == NULL)
5443 printf("Return-path copied from sender\n");
5444 return_path = string_copy(sender_address);
5448 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5450 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5452 receive_add_recipient(
5453 string_sprintf("%s%s%s@%s",
5454 (ftest_prefix == NULL)? US"" : ftest_prefix,
5456 (ftest_suffix == NULL)? US"" : ftest_suffix,
5457 deliver_domain), -1);
5459 printf("Recipient = %s\n", recipients_list[0].address);
5460 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5461 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5463 if (chdir("/")) /* Get away from wherever the user is running this from */
5465 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5466 exim_exit(EXIT_FAILURE);
5469 /* Now we run either a system filter test, or a user filter test, or both.
5470 In the latter case, headers added by the system filter will persist and be
5471 available to the user filter. We need to copy the filter variables
5474 if ((filter_test & FTEST_SYSTEM) != 0)
5476 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5477 exim_exit(EXIT_FAILURE);
5480 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5482 if ((filter_test & FTEST_USER) != 0)
5484 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5485 exim_exit(EXIT_FAILURE);
5488 exim_exit(EXIT_SUCCESS);
5491 /* Else act on the result of message reception. We should not get here unless
5492 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5493 will be TRUE. If it is not, check on the number of messages received in this
5496 if (!session_local_queue_only &&
5497 smtp_accept_queue_per_connection > 0 &&
5498 receive_messagecount > smtp_accept_queue_per_connection)
5500 session_local_queue_only = TRUE;
5501 queue_only_reason = 2;
5504 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5505 and queue_only_load is set, check that the load average is below it. If it is
5506 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5507 default), we put the whole session into queue_only mode. It then remains this
5508 way for any subsequent messages on the same SMTP connection. This is a
5509 deliberate choice; even though the load average may fall, it doesn't seem
5510 right to deliver later messages on the same call when not delivering earlier
5511 ones. However, there are odd cases where this is not wanted, so this can be
5512 changed by setting queue_only_load_latch false. */
5514 local_queue_only = session_local_queue_only;
5515 if (!local_queue_only && queue_only_load >= 0)
5517 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5518 if (local_queue_only)
5520 queue_only_reason = 3;
5521 if (queue_only_load_latch) session_local_queue_only = TRUE;
5525 /* If running as an MUA wrapper, all queueing options and freezing options
5529 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5531 /* Log the queueing here, when it will get a message id attached, but
5532 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5535 if (local_queue_only) switch(queue_only_reason)
5538 log_write(L_delay_delivery,
5539 LOG_MAIN, "no immediate delivery: more than %d messages "
5540 "received in one connection", smtp_accept_queue_per_connection);
5544 log_write(L_delay_delivery,
5545 LOG_MAIN, "no immediate delivery: load average %.2f",
5546 (double)load_average/1000.0);
5550 /* Else do the delivery unless the ACL or local_scan() called for queue only
5551 or froze the message. Always deliver in a separate process. A fork failure is
5552 not a disaster, as the delivery will eventually happen on a subsequent queue
5553 run. The search cache must be tidied before the fork, as the parent will
5554 do it before exiting. The child will trigger a lookup failure and
5555 thereby defer the delivery if it tries to use (for example) a cached ldap
5556 connection that the parent has called unbind on. */
5558 else if (!queue_only_policy && !deliver_freeze)
5563 if ((pid = fork()) == 0)
5566 close_unwanted(); /* Close unwanted file descriptors and TLS */
5567 exim_nullstd(); /* Ensure std{in,out,err} exist */
5569 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5570 mode, deliver_drop_privilege is forced TRUE). */
5572 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5574 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5576 /* Control does not return here. */
5579 /* No need to re-exec */
5581 rc = deliver_message(message_id, FALSE, FALSE);
5583 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5584 EXIT_SUCCESS : EXIT_FAILURE);
5589 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5590 "process: %s", strerror(errno));
5593 /* In the parent, wait if synchronous delivery is required. This will
5594 always be the case in MUA wrapper mode. */
5596 else if (synchronous_delivery)
5599 while (wait(&status) != pid);
5600 if ((status & 0x00ff) != 0)
5601 log_write(0, LOG_MAIN|LOG_PANIC,
5602 "process %d crashed with signal %d while delivering %s",
5603 (int)pid, status & 0x00ff, message_id);
5604 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5608 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5609 automatically reaps children (see comments above the loop), clear away any
5610 finished subprocesses here, in case there are lots of messages coming in
5611 from the same source. */
5613 #ifndef SIG_IGN_WORKS
5614 while (waitpid(-1, NULL, WNOHANG) > 0);
5618 exim_exit(EXIT_SUCCESS); /* Never returns */
5619 return 0; /* To stop compiler warning */