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(const 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(CCS 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 *log_oneline = NULL;
1504 uschar *malware_test_file = NULL;
1505 uschar *real_sender_address;
1506 uschar *originator_home = US"/";
1511 struct stat statbuf;
1512 pid_t passed_qr_pid = (pid_t)0;
1513 int passed_qr_pipe = -1;
1514 gid_t group_list[NGROUPS_MAX];
1516 /* For the -bI: flag */
1517 enum commandline_info info_flag = CMDINFO_NONE;
1518 BOOL info_stdout = FALSE;
1520 /* Possible options for -R and -S */
1522 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1524 /* Need to define this in case we need to change the environment in order
1525 to get rid of a bogus time zone. We have to make it char rather than uschar
1526 because some OS define it in /usr/include/unistd.h. */
1528 extern char **environ;
1530 /* If the Exim user and/or group and/or the configuration file owner/group were
1531 defined by ref:name at build time, we must now find the actual uid/gid values.
1532 This is a feature to make the lives of binary distributors easier. */
1534 #ifdef EXIM_USERNAME
1535 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1539 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1543 /* If ref:name uses a number as the name, route_finduser() returns
1544 TRUE with exim_uid set and pw coerced to NULL. */
1546 exim_gid = pw->pw_gid;
1547 #ifndef EXIM_GROUPNAME
1551 "exim: ref:name should specify a usercode, not a group.\n"
1552 "exim: can't let you get away with it unless you also specify a group.\n");
1559 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1565 #ifdef EXIM_GROUPNAME
1566 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1568 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1574 #ifdef CONFIGURE_OWNERNAME
1575 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1577 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1578 CONFIGURE_OWNERNAME);
1583 /* We default the system_filter_user to be the Exim run-time user, as a
1584 sane non-root value. */
1585 system_filter_uid = exim_uid;
1587 #ifdef CONFIGURE_GROUPNAME
1588 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1590 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1591 CONFIGURE_GROUPNAME);
1596 /* In the Cygwin environment, some initialization needs doing. It is fudged
1597 in by means of this macro. */
1603 /* Check a field which is patched when we are running Exim within its
1604 testing harness; do a fast initial check, and then the whole thing. */
1606 running_in_test_harness =
1607 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1609 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1610 at the start of a program; however, it seems that some environments do not
1611 follow this. A "strange" locale can affect the formatting of timestamps, so we
1614 setlocale(LC_ALL, "C");
1616 /* Set up the default handler for timing using alarm(). */
1618 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1620 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1621 because store_malloc writes a log entry on failure. */
1623 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1624 if (log_buffer == NULL)
1626 fprintf(stderr, "exim: failed to get store for log buffer\n");
1630 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1631 NULL when the daemon is run and the file is closed. We have to use this
1632 indirection, because some systems don't allow writing to the variable "stderr".
1635 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1637 /* Arrange for the PCRE regex library to use our store functions. Note that
1638 the normal calls are actually macros that add additional arguments for
1639 debugging purposes so we have to assign specially constructed functions here.
1640 The default is to use store in the stacking pool, but this is overridden in the
1641 regex_must_compile() function. */
1643 pcre_malloc = function_store_get;
1644 pcre_free = function_dummy_free;
1646 /* Ensure there is a big buffer for temporary use in several places. It is put
1647 in malloc store so that it can be freed for enlargement if necessary. */
1649 big_buffer = store_malloc(big_buffer_size);
1651 /* Set up the handler for the data request signal, and set the initial
1652 descriptive text. */
1654 set_process_info("initializing");
1655 os_restarting_signal(SIGUSR1, usr1_handler);
1657 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1658 in the daemon code. For the rest of Exim's uses, we ignore it. */
1660 signal(SIGHUP, SIG_IGN);
1662 /* We don't want to die on pipe errors as the code is written to handle
1663 the write error instead. */
1665 signal(SIGPIPE, SIG_IGN);
1667 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1668 set to SIG_IGN. This causes subprocesses that complete before the parent
1669 process waits for them not to hang around, so when Exim calls wait(), nothing
1670 is there. The wait() code has been made robust against this, but let's ensure
1671 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1672 ending status. We use sigaction rather than plain signal() on those OS where
1673 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1674 problem on AIX with this.) */
1678 struct sigaction act;
1679 act.sa_handler = SIG_DFL;
1680 sigemptyset(&(act.sa_mask));
1682 sigaction(SIGCHLD, &act, NULL);
1685 signal(SIGCHLD, SIG_DFL);
1688 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1693 /* Set up the version number. Set up the leading 'E' for the external form of
1694 message ids, set the pointer to the internal form, and initialize it to
1695 indicate no message being processed. */
1698 message_id_option[0] = '-';
1699 message_id_external = message_id_option + 1;
1700 message_id_external[0] = 'E';
1701 message_id = message_id_external + 1;
1704 /* Set the umask to zero so that any files Exim creates using open() are
1705 created with the modes that it specifies. NOTE: Files created with fopen() have
1706 a problem, which was not recognized till rather late (February 2006). With this
1707 umask, such files will be world writeable. (They are all content scanning files
1708 in the spool directory, which isn't world-accessible, so this is not a
1709 disaster, but it's untidy.) I don't want to change this overall setting,
1710 however, because it will interact badly with the open() calls. Instead, there's
1711 now a function called modefopen() that fiddles with the umask while calling
1716 /* Precompile the regular expression for matching a message id. Keep this in
1717 step with the code that generates ids in the accept.c module. We need to do
1718 this here, because the -M options check their arguments for syntactic validity
1719 using mac_ismsgid, which uses this. */
1722 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1724 /* Precompile the regular expression that is used for matching an SMTP error
1725 code, possibly extended, at the start of an error message. Note that the
1726 terminating whitespace character is included. */
1729 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1732 #ifdef WHITELIST_D_MACROS
1733 /* Precompile the regular expression used to filter the content of macros
1734 given to -D for permissibility. */
1736 regex_whitelisted_macro =
1737 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1741 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1742 this seems to be a generally accepted convention, since one finds symbolic
1743 links called "mailq" in standard OS configurations. */
1745 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1746 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1749 receiving_message = FALSE;
1750 called_as = US"-mailq";
1753 /* If the program is called as "rmail" treat it as equivalent to
1754 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1755 i.e. preventing a single dot on a line from terminating the message, and
1756 returning with zero return code, even in cases of error (provided an error
1757 message has been sent). */
1759 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1760 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1763 called_as = US"-rmail";
1764 errors_sender_rc = EXIT_SUCCESS;
1767 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1768 this is a smail convention. */
1770 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1771 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1773 smtp_input = smtp_batched_input = TRUE;
1774 called_as = US"-rsmtp";
1777 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1778 this is a smail convention. */
1780 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1781 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1784 receiving_message = FALSE;
1785 called_as = US"-runq";
1788 /* If the program is called as "newaliases" treat it as equivalent to
1789 "exim -bi"; this is a sendmail convention. */
1791 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1792 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1795 receiving_message = FALSE;
1796 called_as = US"-newaliases";
1799 /* Save the original effective uid for a couple of uses later. It should
1800 normally be root, but in some esoteric environments it may not be. */
1802 original_euid = geteuid();
1804 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1805 to be the same as the real ones. This makes a difference only if Exim is setuid
1806 (or setgid) to something other than root, which could be the case in some
1807 special configurations. */
1809 real_uid = getuid();
1810 real_gid = getgid();
1812 if (real_uid == root_uid)
1814 rv = setgid(real_gid);
1817 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1818 (long int)real_gid, strerror(errno));
1821 rv = setuid(real_uid);
1824 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1825 (long int)real_uid, strerror(errno));
1830 /* If neither the original real uid nor the original euid was root, Exim is
1831 running in an unprivileged state. */
1833 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1835 /* Scan the program's arguments. Some can be dealt with right away; others are
1836 simply recorded for checking and handling afterwards. Do a high-level switch
1837 on the second character (the one after '-'), to save some effort. */
1839 for (i = 1; i < argc; i++)
1841 BOOL badarg = FALSE;
1842 uschar *arg = argv[i];
1846 /* An argument not starting with '-' is the start of a recipients list;
1847 break out of the options-scanning loop. */
1855 /* An option consistion of -- terminates the options */
1857 if (Ustrcmp(arg, "--") == 0)
1859 recipients_arg = i + 1;
1863 /* Handle flagged options */
1865 switchchar = arg[1];
1868 /* Make all -ex options synonymous with -oex arguments, since that
1869 is assumed by various callers. Also make -qR options synonymous with -R
1870 options, as that seems to be required as well. Allow for -qqR too, and
1871 the same for -S options. */
1873 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1874 Ustrncmp(arg+1, "qR", 2) == 0 ||
1875 Ustrncmp(arg+1, "qS", 2) == 0)
1877 switchchar = arg[2];
1880 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1882 switchchar = arg[3];
1884 queue_2stage = TRUE;
1887 /* Make -r synonymous with -f, since it is a documented alias */
1889 else if (arg[1] == 'r') switchchar = 'f';
1891 /* Make -ov synonymous with -v */
1893 else if (Ustrcmp(arg, "-ov") == 0)
1899 /* deal with --option_aliases */
1900 else if (switchchar == '-')
1902 if (Ustrcmp(argrest, "help") == 0)
1904 usage_wanted = TRUE;
1907 else if (Ustrcmp(argrest, "version") == 0)
1914 /* High-level switch on active initial letter */
1919 /* sendmail uses -Ac and -Am to control which .cf file is used;
1922 if (*argrest == '\0') { badarg = TRUE; break; }
1925 BOOL ignore = FALSE;
1930 if (*(argrest + 1) == '\0')
1934 if (!ignore) { badarg = TRUE; break; }
1938 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1939 so has no need of it. */
1942 if (*argrest == 0) i++; /* Skip over the type */
1947 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1949 /* -bd: Run in daemon mode, awaiting SMTP connections.
1950 -bdf: Ditto, but in the foreground.
1953 if (*argrest == 'd')
1955 daemon_listen = TRUE;
1956 if (*(++argrest) == 'f') background_daemon = FALSE;
1957 else if (*argrest != 0) { badarg = TRUE; break; }
1960 /* -be: Run in expansion test mode
1961 -bem: Ditto, but read a message from a file first
1964 else if (*argrest == 'e')
1966 expansion_test = checking = TRUE;
1967 if (argrest[1] == 'm')
1969 if (++i >= argc) { badarg = TRUE; break; }
1970 expansion_test_message = argv[i];
1973 if (argrest[1] != 0) { badarg = TRUE; break; }
1976 /* -bF: Run system filter test */
1978 else if (*argrest == 'F')
1980 filter_test |= FTEST_SYSTEM;
1981 if (*(++argrest) != 0) { badarg = TRUE; break; }
1982 if (++i < argc) filter_test_sfile = argv[i]; else
1984 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1989 /* -bf: Run user filter test
1990 -bfd: Set domain for filter testing
1991 -bfl: Set local part for filter testing
1992 -bfp: Set prefix for filter testing
1993 -bfs: Set suffix for filter testing
1996 else if (*argrest == 'f')
1998 if (*(++argrest) == 0)
2000 filter_test |= FTEST_USER;
2001 if (++i < argc) filter_test_ufile = argv[i]; else
2003 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2011 fprintf(stderr, "exim: string expected after %s\n", arg);
2014 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2015 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2016 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2017 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2018 else { badarg = TRUE; break; }
2022 /* -bh: Host checking - an IP address must follow. */
2024 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2026 if (++i >= argc) { badarg = TRUE; break; }
2027 sender_host_address = argv[i];
2028 host_checking = checking = log_testing_mode = TRUE;
2029 host_checking_callout = argrest[1] == 'c';
2032 /* -bi: This option is used by sendmail to initialize *the* alias file,
2033 though it has the -oA option to specify a different file. Exim has no
2034 concept of *the* alias file, but since Sun's YP make script calls
2035 sendmail this way, some support must be provided. */
2037 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2039 /* -bI: provide information, of the type to follow after a colon.
2040 This is an Exim flag. */
2042 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2044 uschar *p = &argrest[2];
2045 info_flag = CMDINFO_HELP;
2048 if (strcmpic(p, CUS"sieve") == 0)
2050 info_flag = CMDINFO_SIEVE;
2053 else if (strcmpic(p, CUS"dscp") == 0)
2055 info_flag = CMDINFO_DSCP;
2058 else if (strcmpic(p, CUS"help") == 0)
2065 /* -bm: Accept and deliver message - the default option. Reinstate
2066 receiving_message, which got turned off for all -b options. */
2068 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2070 /* -bmalware: test the filename given for malware */
2072 else if (Ustrcmp(argrest, "malware") == 0)
2074 if (++i >= argc) { badarg = TRUE; break; }
2075 malware_test_file = argv[i];
2078 /* -bnq: For locally originating messages, do not qualify unqualified
2079 addresses. In the envelope, this causes errors; in header lines they
2082 else if (Ustrcmp(argrest, "nq") == 0)
2084 allow_unqualified_sender = FALSE;
2085 allow_unqualified_recipient = FALSE;
2088 /* -bpxx: List the contents of the mail queue, in various forms. If
2089 the option is -bpc, just a queue count is needed. Otherwise, if the
2090 first letter after p is r, then order is random. */
2092 else if (*argrest == 'p')
2094 if (*(++argrest) == 'c')
2097 if (*(++argrest) != 0) badarg = TRUE;
2101 if (*argrest == 'r')
2103 list_queue_option = 8;
2106 else list_queue_option = 0;
2110 /* -bp: List the contents of the mail queue, top-level only */
2112 if (*argrest == 0) {}
2114 /* -bpu: List the contents of the mail queue, top-level undelivered */
2116 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2118 /* -bpa: List the contents of the mail queue, including all delivered */
2120 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2122 /* Unknown after -bp[r] */
2132 /* -bP: List the configuration variables given as the address list.
2133 Force -v, so configuration errors get displayed. */
2135 else if (Ustrcmp(argrest, "P") == 0)
2137 list_options = TRUE;
2138 debug_selector |= D_v;
2139 debug_file = stderr;
2142 /* -brt: Test retry configuration lookup */
2144 else if (Ustrcmp(argrest, "rt") == 0)
2146 test_retry_arg = i + 1;
2150 /* -brw: Test rewrite configuration */
2152 else if (Ustrcmp(argrest, "rw") == 0)
2154 test_rewrite_arg = i + 1;
2158 /* -bS: Read SMTP commands on standard input, but produce no replies -
2159 all errors are reported by sending messages. */
2161 else if (Ustrcmp(argrest, "S") == 0)
2162 smtp_input = smtp_batched_input = receiving_message = TRUE;
2164 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2165 on standard output. */
2167 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2169 /* -bt: address testing mode */
2171 else if (Ustrcmp(argrest, "t") == 0)
2172 address_test_mode = checking = log_testing_mode = TRUE;
2174 /* -bv: verify addresses */
2176 else if (Ustrcmp(argrest, "v") == 0)
2177 verify_address_mode = checking = log_testing_mode = TRUE;
2179 /* -bvs: verify sender addresses */
2181 else if (Ustrcmp(argrest, "vs") == 0)
2183 verify_address_mode = checking = log_testing_mode = TRUE;
2184 verify_as_sender = TRUE;
2187 /* -bV: Print version string and support details */
2189 else if (Ustrcmp(argrest, "V") == 0)
2191 printf("Exim version %s #%s built %s\n", version_string,
2192 version_cnumber, version_date);
2193 printf("%s\n", CS version_copyright);
2194 version_printed = TRUE;
2195 show_whats_supported(stdout);
2198 /* -bw: inetd wait mode, accept a listening socket as stdin */
2200 else if (*argrest == 'w')
2202 inetd_wait_mode = TRUE;
2203 background_daemon = FALSE;
2204 daemon_listen = TRUE;
2205 if (*(++argrest) != '\0')
2207 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2208 if (inetd_wait_timeout <= 0)
2210 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2220 /* -C: change configuration file list; ignore if it isn't really
2221 a change! Enforce a prefix check if required. */
2226 if(++i < argc) argrest = argv[i]; else
2227 { badarg = TRUE; break; }
2229 if (Ustrcmp(config_main_filelist, argrest) != 0)
2231 #ifdef ALT_CONFIG_PREFIX
2233 int len = Ustrlen(ALT_CONFIG_PREFIX);
2234 uschar *list = argrest;
2236 while((filename = string_nextinlist(&list, &sep, big_buffer,
2237 big_buffer_size)) != NULL)
2239 if ((Ustrlen(filename) < len ||
2240 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2241 Ustrstr(filename, "/../") != NULL) &&
2242 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2244 fprintf(stderr, "-C Permission denied\n");
2249 if (real_uid != root_uid)
2251 #ifdef TRUSTED_CONFIG_LIST
2253 if (real_uid != exim_uid
2254 #ifdef CONFIGURE_OWNER
2255 && real_uid != config_uid
2258 trusted_config = FALSE;
2261 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2264 struct stat statbuf;
2266 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2267 (statbuf.st_uid != root_uid /* owner not root */
2268 #ifdef CONFIGURE_OWNER
2269 && statbuf.st_uid != config_uid /* owner not the special one */
2272 (statbuf.st_gid != root_gid /* group not root */
2273 #ifdef CONFIGURE_GROUP
2274 && statbuf.st_gid != config_gid /* group not the special one */
2276 && (statbuf.st_mode & 020) != 0 /* group writeable */
2278 (statbuf.st_mode & 2) != 0) /* world writeable */
2280 trusted_config = FALSE;
2285 /* Well, the trust list at least is up to scratch... */
2286 void *reset_point = store_get(0);
2287 uschar *trusted_configs[32];
2291 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2293 uschar *start = big_buffer, *nl;
2294 while (*start && isspace(*start))
2298 nl = Ustrchr(start, '\n');
2301 trusted_configs[nr_configs++] = string_copy(start);
2302 if (nr_configs == 32)
2310 uschar *list = argrest;
2312 while (trusted_config && (filename = string_nextinlist(&list,
2313 &sep, big_buffer, big_buffer_size)) != NULL)
2315 for (i=0; i < nr_configs; i++)
2317 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2320 if (i == nr_configs)
2322 trusted_config = FALSE;
2326 store_reset(reset_point);
2330 /* No valid prefixes found in trust_list file. */
2331 trusted_config = FALSE;
2337 /* Could not open trust_list file. */
2338 trusted_config = FALSE;
2342 /* Not root; don't trust config */
2343 trusted_config = FALSE;
2347 config_main_filelist = argrest;
2348 config_changed = TRUE;
2353 /* -D: set up a macro definition */
2356 #ifdef DISABLE_D_OPTION
2357 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2362 macro_item *mlast = NULL;
2365 uschar *s = argrest;
2367 while (isspace(*s)) s++;
2369 if (*s < 'A' || *s > 'Z')
2371 fprintf(stderr, "exim: macro name set by -D must start with "
2372 "an upper case letter\n");
2376 while (isalnum(*s) || *s == '_')
2378 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2382 if (ptr == 0) { badarg = TRUE; break; }
2383 while (isspace(*s)) s++;
2386 if (*s++ != '=') { badarg = TRUE; break; }
2387 while (isspace(*s)) s++;
2390 for (m = macros; m != NULL; m = m->next)
2392 if (Ustrcmp(m->name, name) == 0)
2394 fprintf(stderr, "exim: duplicated -D in command line\n");
2400 m = store_get(sizeof(macro_item) + Ustrlen(name));
2402 m->command_line = TRUE;
2403 if (mlast == NULL) macros = m; else mlast->next = m;
2404 Ustrcpy(m->name, name);
2405 m->replacement = string_copy(s);
2407 if (clmacro_count >= MAX_CLMACROS)
2409 fprintf(stderr, "exim: too many -D options on command line\n");
2412 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2418 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2419 The latter is now a no-op, retained for compatibility only. If -dd is used,
2420 debugging subprocesses of the daemon is disabled. */
2423 if (Ustrcmp(argrest, "ropcr") == 0)
2425 /* drop_cr = TRUE; */
2428 /* Use an intermediate variable so that we don't set debugging while
2429 decoding the debugging bits. */
2433 unsigned int selector = D_default;
2436 if (*argrest == 'd')
2438 debug_daemon = TRUE;
2442 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2443 debug_options_count, US"debug", 0);
2444 debug_selector = selector;
2449 /* -E: This is a local error message. This option is not intended for
2450 external use at all, but is not restricted to trusted callers because it
2451 does no harm (just suppresses certain error messages) and if Exim is run
2452 not setuid root it won't always be trusted when it generates error
2453 messages using this option. If there is a message id following -E, point
2454 message_reference at it, for logging. */
2457 local_error_message = TRUE;
2458 if (mac_ismsgid(argrest)) message_reference = argrest;
2462 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2463 option, so it looks as if historically the -oex options are also callable
2464 without the leading -o. So we have to accept them. Before the switch,
2465 anything starting -oe has been converted to -e. Exim does not support all
2466 of the sendmail error options. */
2469 if (Ustrcmp(argrest, "e") == 0)
2471 arg_error_handling = ERRORS_SENDER;
2472 errors_sender_rc = EXIT_SUCCESS;
2474 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2475 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2476 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2477 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2482 /* -F: Set sender's full name, used instead of the gecos entry from
2483 the password file. Since users can usually alter their gecos entries,
2484 there's no security involved in using this instead. The data can follow
2485 the -F or be in the next argument. */
2490 if(++i < argc) argrest = argv[i]; else
2491 { badarg = TRUE; break; }
2493 originator_name = argrest;
2494 sender_name_forced = TRUE;
2498 /* -f: Set sender's address - this value is only actually used if Exim is
2499 run by a trusted user, or if untrusted_set_sender is set and matches the
2500 address, except that the null address can always be set by any user. The
2501 test for this happens later, when the value given here is ignored when not
2502 permitted. For an untrusted user, the actual sender is still put in Sender:
2503 if it doesn't match the From: header (unless no_local_from_check is set).
2504 The data can follow the -f or be in the next argument. The -r switch is an
2505 obsolete form of -f but since there appear to be programs out there that
2506 use anything that sendmail has ever supported, better accept it - the
2507 synonymizing is done before the switch above.
2509 At this stage, we must allow domain literal addresses, because we don't
2510 know what the setting of allow_domain_literals is yet. Ditto for trailing
2511 dots and strip_trailing_dot. */
2519 if (i+1 < argc) argrest = argv[++i]; else
2520 { badarg = TRUE; break; }
2524 sender_address = string_sprintf(""); /* Ensure writeable memory */
2528 uschar *temp = argrest + Ustrlen(argrest) - 1;
2529 while (temp >= argrest && isspace(*temp)) temp--;
2530 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2531 allow_domain_literals = TRUE;
2532 strip_trailing_dot = TRUE;
2533 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2534 &sender_address_domain, TRUE);
2535 allow_domain_literals = FALSE;
2536 strip_trailing_dot = FALSE;
2537 if (sender_address == NULL)
2539 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2540 return EXIT_FAILURE;
2543 sender_address_forced = TRUE;
2547 /* -G: sendmail invocation to specify that it's a gateway submission and
2548 sendmail may complain about problems instead of fixing them.
2549 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2550 not at this time complain about problems. */
2556 /* -h: Set the hop count for an incoming message. Exim does not currently
2557 support this; it always computes it by counting the Received: headers.
2558 To put it in will require a change to the spool header file format. */
2563 if(++i < argc) argrest = argv[i]; else
2564 { badarg = TRUE; break; }
2566 if (!isdigit(*argrest)) badarg = TRUE;
2570 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2571 not to be documented for sendmail but mailx (at least) uses it) */
2574 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2578 /* -L: set the identifier used for syslog; equivalent to setting
2579 syslog_processname in the config file, but needs to be an admin option. */
2582 if (*argrest == '\0')
2584 if(++i < argc) argrest = argv[i]; else
2585 { badarg = TRUE; break; }
2587 sz = Ustrlen(argrest);
2590 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2591 return EXIT_FAILURE;
2595 fprintf(stderr, "exim: the -L syslog name is too short\n");
2596 return EXIT_FAILURE;
2598 cmdline_syslog_name = argrest;
2602 receiving_message = FALSE;
2604 /* -MC: continue delivery of another message via an existing open
2605 file descriptor. This option is used for an internal call by the
2606 smtp transport when there is a pending message waiting to go to an
2607 address to which it has got a connection. Five subsequent arguments are
2608 required: transport name, host name, IP address, sequence number, and
2609 message_id. Transports may decline to create new processes if the sequence
2610 number gets too big. The channel is stdin. This (-MC) must be the last
2611 argument. There's a subsequent check that the real-uid is privileged.
2613 If we are running in the test harness. delay for a bit, to let the process
2614 that set this one up complete. This makes for repeatability of the logging,
2617 if (Ustrcmp(argrest, "C") == 0)
2619 union sockaddr_46 interface_sock;
2620 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2624 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2625 return EXIT_FAILURE;
2628 if (msg_action_arg >= 0)
2630 fprintf(stderr, "exim: incompatible arguments\n");
2631 return EXIT_FAILURE;
2634 continue_transport = argv[++i];
2635 continue_hostname = argv[++i];
2636 continue_host_address = argv[++i];
2637 continue_sequence = Uatoi(argv[++i]);
2638 msg_action = MSG_DELIVER;
2639 msg_action_arg = ++i;
2640 forced_delivery = TRUE;
2641 queue_run_pid = passed_qr_pid;
2642 queue_run_pipe = passed_qr_pipe;
2644 if (!mac_ismsgid(argv[i]))
2646 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2648 return EXIT_FAILURE;
2651 /* Set up $sending_ip_address and $sending_port */
2653 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2655 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2659 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2661 return EXIT_FAILURE;
2664 if (running_in_test_harness) millisleep(500);
2668 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2669 precedes -MC (see above). The flag indicates that the host to which
2670 Exim is connected has accepted an AUTH sequence. */
2672 else if (Ustrcmp(argrest, "CA") == 0)
2674 smtp_authenticated = TRUE;
2678 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2679 that exim is connected to supports the esmtp extension DSN */
2680 else if (Ustrcmp(argrest, "CD") == 0)
2682 smtp_use_dsn = TRUE;
2686 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2687 it preceded -MC (see above) */
2689 else if (Ustrcmp(argrest, "CP") == 0)
2691 smtp_use_pipelining = TRUE;
2695 /* -MCQ: pass on the pid of the queue-running process that started
2696 this chain of deliveries and the fd of its synchronizing pipe; this
2697 is useful only when it precedes -MC (see above) */
2699 else if (Ustrcmp(argrest, "CQ") == 0)
2701 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2703 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2708 /* -MCS: set the smtp_use_size flag; this is useful only when it
2709 precedes -MC (see above) */
2711 else if (Ustrcmp(argrest, "CS") == 0)
2713 smtp_use_size = TRUE;
2717 /* -MCT: set the tls_offered flag; this is useful only when it
2718 precedes -MC (see above). The flag indicates that the host to which
2719 Exim is connected has offered TLS support. */
2722 else if (Ustrcmp(argrest, "CT") == 0)
2729 /* -M[x]: various operations on the following list of message ids:
2730 -M deliver the messages, ignoring next retry times and thawing
2731 -Mc deliver the messages, checking next retry times, no thawing
2732 -Mf freeze the messages
2733 -Mg give up on the messages
2734 -Mt thaw the messages
2735 -Mrm remove the messages
2736 In the above cases, this must be the last option. There are also the
2737 following options which are followed by a single message id, and which
2738 act on that message. Some of them use the "recipient" addresses as well.
2739 -Mar add recipient(s)
2740 -Mmad mark all recipients delivered
2741 -Mmd mark recipients(s) delivered
2743 -Mset load a message for use with -be
2745 -Mvc show copy (of whole message, in RFC 2822 format)
2750 else if (*argrest == 0)
2752 msg_action = MSG_DELIVER;
2753 forced_delivery = deliver_force_thaw = TRUE;
2755 else if (Ustrcmp(argrest, "ar") == 0)
2757 msg_action = MSG_ADD_RECIPIENT;
2758 one_msg_action = TRUE;
2760 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2761 else if (Ustrcmp(argrest, "es") == 0)
2763 msg_action = MSG_EDIT_SENDER;
2764 one_msg_action = TRUE;
2766 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2767 else if (Ustrcmp(argrest, "g") == 0)
2769 msg_action = MSG_DELIVER;
2770 deliver_give_up = TRUE;
2772 else if (Ustrcmp(argrest, "mad") == 0)
2774 msg_action = MSG_MARK_ALL_DELIVERED;
2776 else if (Ustrcmp(argrest, "md") == 0)
2778 msg_action = MSG_MARK_DELIVERED;
2779 one_msg_action = TRUE;
2781 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2782 else if (Ustrcmp(argrest, "set") == 0)
2784 msg_action = MSG_LOAD;
2785 one_msg_action = TRUE;
2787 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2788 else if (Ustrcmp(argrest, "vb") == 0)
2790 msg_action = MSG_SHOW_BODY;
2791 one_msg_action = TRUE;
2793 else if (Ustrcmp(argrest, "vc") == 0)
2795 msg_action = MSG_SHOW_COPY;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "vh") == 0)
2800 msg_action = MSG_SHOW_HEADER;
2801 one_msg_action = TRUE;
2803 else if (Ustrcmp(argrest, "vl") == 0)
2805 msg_action = MSG_SHOW_LOG;
2806 one_msg_action = TRUE;
2808 else { badarg = TRUE; break; }
2810 /* All the -Mxx options require at least one message id. */
2812 msg_action_arg = i + 1;
2813 if (msg_action_arg >= argc)
2815 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2816 return EXIT_FAILURE;
2819 /* Some require only message ids to follow */
2821 if (!one_msg_action)
2824 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2826 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2828 return EXIT_FAILURE;
2830 goto END_ARG; /* Remaining args are ids */
2833 /* Others require only one message id, possibly followed by addresses,
2834 which will be handled as normal arguments. */
2838 if (!mac_ismsgid(argv[msg_action_arg]))
2840 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2841 argv[msg_action_arg], arg);
2842 return EXIT_FAILURE;
2849 /* Some programs seem to call the -om option without the leading o;
2850 for sendmail it askes for "me too". Exim always does this. */
2853 if (*argrest != 0) badarg = TRUE;
2857 /* -N: don't do delivery - a debugging option that stops transports doing
2858 their thing. It implies debugging at the D_v level. */
2863 dont_deliver = TRUE;
2864 debug_selector |= D_v;
2865 debug_file = stderr;
2871 /* -n: This means "don't alias" in sendmail, apparently.
2872 For normal invocations, it has no effect.
2873 It may affect some other options. */
2879 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2880 option to the specified value. This form uses long names. We need to handle
2881 -O option=value and -Ooption=value. */
2888 fprintf(stderr, "exim: string expected after -O\n");
2896 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2899 if (*argrest == 'A')
2901 alias_arg = argrest + 1;
2902 if (alias_arg[0] == 0)
2904 if (i+1 < argc) alias_arg = argv[++i]; else
2906 fprintf(stderr, "exim: string expected after -oA\n");
2912 /* -oB: Set a connection message max value for remote deliveries */
2914 else if (*argrest == 'B')
2916 uschar *p = argrest + 1;
2919 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2921 connection_max_messages = 1;
2930 fprintf(stderr, "exim: number expected after -oB\n");
2933 connection_max_messages = Uatoi(p);
2937 /* -odb: background delivery */
2939 else if (Ustrcmp(argrest, "db") == 0)
2941 synchronous_delivery = FALSE;
2942 arg_queue_only = FALSE;
2943 queue_only_set = TRUE;
2946 /* -odf: foreground delivery (smail-compatible option); same effect as
2947 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2950 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2952 synchronous_delivery = TRUE;
2953 arg_queue_only = FALSE;
2954 queue_only_set = TRUE;
2957 /* -odq: queue only */
2959 else if (Ustrcmp(argrest, "dq") == 0)
2961 synchronous_delivery = FALSE;
2962 arg_queue_only = TRUE;
2963 queue_only_set = TRUE;
2966 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2967 but no remote delivery */
2969 else if (Ustrcmp(argrest, "dqs") == 0)
2972 arg_queue_only = FALSE;
2973 queue_only_set = TRUE;
2976 /* -oex: Sendmail error flags. As these are also accepted without the
2977 leading -o prefix, for compatibility with vacation and other callers,
2978 they are handled with -e above. */
2980 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2981 -oitrue: Another sendmail syntax for the same */
2983 else if (Ustrcmp(argrest, "i") == 0 ||
2984 Ustrcmp(argrest, "itrue") == 0)
2987 /* -oM*: Set various characteristics for an incoming message; actually
2988 acted on for trusted callers only. */
2990 else if (*argrest == 'M')
2994 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2998 /* -oMa: Set sender host address */
3000 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3002 /* -oMaa: Set authenticator name */
3004 else if (Ustrcmp(argrest, "Maa") == 0)
3005 sender_host_authenticated = argv[++i];
3007 /* -oMas: setting authenticated sender */
3009 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3011 /* -oMai: setting authenticated id */
3013 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3015 /* -oMi: Set incoming interface address */
3017 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3019 /* -oMm: Message reference */
3021 else if (Ustrcmp(argrest, "Mm") == 0)
3023 if (!mac_ismsgid(argv[i+1]))
3025 fprintf(stderr,"-oMm must be a valid message ID\n");
3028 if (!trusted_config)
3030 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3033 message_reference = argv[++i];
3036 /* -oMr: Received protocol */
3038 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3040 /* -oMs: Set sender host name */
3042 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3044 /* -oMt: Set sender ident */
3046 else if (Ustrcmp(argrest, "Mt") == 0)
3048 sender_ident_set = TRUE;
3049 sender_ident = argv[++i];
3052 /* Else a bad argument */
3061 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3062 seem to call this as -m (undocumented), so that is also accepted (see
3065 else if (Ustrcmp(argrest, "m") == 0) {}
3067 /* -oo: An ancient flag for old-style addresses which still seems to
3068 crop up in some calls (see in SCO). */
3070 else if (Ustrcmp(argrest, "o") == 0) {}
3072 /* -oP <name>: set pid file path for daemon */
3074 else if (Ustrcmp(argrest, "P") == 0)
3075 override_pid_file_path = argv[++i];
3077 /* -or <n>: set timeout for non-SMTP acceptance
3078 -os <n>: set timeout for SMTP acceptance */
3080 else if (*argrest == 'r' || *argrest == 's')
3082 int *tp = (*argrest == 'r')?
3083 &arg_receive_timeout : &arg_smtp_receive_timeout;
3084 if (argrest[1] == 0)
3086 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3088 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3091 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3096 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3098 else if (Ustrcmp(argrest, "X") == 0)
3099 override_local_interfaces = argv[++i];
3101 /* Unknown -o argument */
3107 /* -ps: force Perl startup; -pd force delayed Perl startup */
3111 if (*argrest == 's' && argrest[1] == 0)
3113 perl_start_option = 1;
3116 if (*argrest == 'd' && argrest[1] == 0)
3118 perl_start_option = -1;
3123 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3124 which sets the host protocol and host name */
3128 if (i+1 < argc) argrest = argv[++i]; else
3129 { badarg = TRUE; break; }
3134 uschar *hn = Ustrchr(argrest, ':');
3137 received_protocol = argrest;
3141 received_protocol = string_copyn(argrest, hn - argrest);
3142 sender_host_name = hn + 1;
3149 receiving_message = FALSE;
3150 if (queue_interval >= 0)
3152 fprintf(stderr, "exim: -q specified more than once\n");
3156 /* -qq...: Do queue runs in a 2-stage manner */
3158 if (*argrest == 'q')
3160 queue_2stage = TRUE;
3164 /* -qi...: Do only first (initial) deliveries */
3166 if (*argrest == 'i')
3168 queue_run_first_delivery = TRUE;
3172 /* -qf...: Run the queue, forcing deliveries
3173 -qff..: Ditto, forcing thawing as well */
3175 if (*argrest == 'f')
3177 queue_run_force = TRUE;
3178 if (*(++argrest) == 'f')
3180 deliver_force_thaw = TRUE;
3185 /* -q[f][f]l...: Run the queue only on local deliveries */
3187 if (*argrest == 'l')
3189 queue_run_local = TRUE;
3193 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3194 optionally starting from a given message id. */
3196 if (*argrest == 0 &&
3197 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3200 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3201 start_queue_run_id = argv[++i];
3202 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3203 stop_queue_run_id = argv[++i];
3206 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3207 optionally local only. */
3212 queue_interval = readconf_readtime(argrest, 0, FALSE);
3214 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3215 if (queue_interval <= 0)
3217 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3224 case 'R': /* Synonymous with -qR... */
3225 receiving_message = FALSE;
3227 /* -Rf: As -R (below) but force all deliveries,
3228 -Rff: Ditto, but also thaw all frozen messages,
3229 -Rr: String is regex
3230 -Rrf: Regex and force
3231 -Rrff: Regex and force and thaw
3233 in all cases provided there are no further characters in this
3239 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3241 if (Ustrcmp(argrest, rsopts[i]) == 0)
3243 if (i != 2) queue_run_force = TRUE;
3244 if (i >= 2) deliver_selectstring_regex = TRUE;
3245 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3246 argrest += Ustrlen(rsopts[i]);
3251 /* -R: Set string to match in addresses for forced queue run to
3252 pick out particular messages. */
3256 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3258 fprintf(stderr, "exim: string expected after -R\n");
3262 else deliver_selectstring = argrest;
3266 /* -r: an obsolete synonym for -f (see above) */
3269 /* -S: Like -R but works on sender. */
3271 case 'S': /* Synonymous with -qS... */
3272 receiving_message = FALSE;
3274 /* -Sf: As -S (below) but force all deliveries,
3275 -Sff: Ditto, but also thaw all frozen messages,
3276 -Sr: String is regex
3277 -Srf: Regex and force
3278 -Srff: Regex and force and thaw
3280 in all cases provided there are no further characters in this
3286 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3288 if (Ustrcmp(argrest, rsopts[i]) == 0)
3290 if (i != 2) queue_run_force = TRUE;
3291 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3292 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3293 argrest += Ustrlen(rsopts[i]);
3298 /* -S: Set string to match in addresses for forced queue run to
3299 pick out particular messages. */
3303 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3305 fprintf(stderr, "exim: string expected after -S\n");
3309 else deliver_selectstring_sender = argrest;
3312 /* -Tqt is an option that is exclusively for use by the testing suite.
3313 It is not recognized in other circumstances. It allows for the setting up
3314 of explicit "queue times" so that various warning/retry things can be
3315 tested. Otherwise variability of clock ticks etc. cause problems. */
3318 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3319 fudged_queue_times = argv[++i];
3324 /* -t: Set flag to extract recipients from body of message. */
3327 if (*argrest == 0) extract_recipients = TRUE;
3329 /* -ti: Set flag to extract recipients from body of message, and also
3330 specify that dot does not end the message. */
3332 else if (Ustrcmp(argrest, "i") == 0)
3334 extract_recipients = TRUE;
3338 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3341 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3348 /* -U: This means "initial user submission" in sendmail, apparently. The
3349 doc claims that in future sendmail may refuse syntactically invalid
3350 messages instead of fixing them. For the moment, we just ignore it. */
3356 /* -v: verify things - this is a very low-level debugging */
3361 debug_selector |= D_v;
3362 debug_file = stderr;
3368 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3370 The -x flag tells the sendmail command that mail from a local
3371 mail program has National Language Support (NLS) extended characters
3372 in the body of the mail item. The sendmail command can send mail with
3373 extended NLS characters across networks that normally corrupts these
3376 As Exim is 8-bit clean, it just ignores this flag. */
3379 if (*argrest != 0) badarg = TRUE;
3382 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3383 logs to that file. We swallow the parameter and otherwise ignore it. */
3386 if (*argrest == '\0')
3389 fprintf(stderr, "exim: string expected after -X\n");
3395 if (*argrest == '\0')
3396 if (++i < argc) log_oneline = argv[i]; else
3398 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3403 /* All other initial characters are errors */
3408 } /* End of high-level switch statement */
3410 /* Failed to recognize the option, or syntax error */
3414 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3415 "option %s\n", arg);
3421 /* If -R or -S have been specified without -q, assume a single queue run. */
3423 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3424 queue_interval < 0) queue_interval = 0;
3428 /* If usage_wanted is set we call the usage function - which never returns */
3429 if (usage_wanted) exim_usage(called_as);
3431 /* Arguments have been processed. Check for incompatibilities. */
3433 (smtp_input || extract_recipients || recipients_arg < argc) &&
3434 (daemon_listen || queue_interval >= 0 || bi_option ||
3435 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3436 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3439 msg_action_arg > 0 &&
3440 (daemon_listen || queue_interval >= 0 || list_options ||
3441 (checking && msg_action != MSG_LOAD) ||
3442 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3445 (daemon_listen || queue_interval >= 0) &&
3446 (sender_address != NULL || list_options || list_queue || checking ||
3450 daemon_listen && queue_interval == 0
3453 inetd_wait_mode && queue_interval >= 0
3457 (checking || smtp_input || extract_recipients ||
3458 filter_test != FTEST_NONE || bi_option)
3461 verify_address_mode &&
3462 (address_test_mode || smtp_input || extract_recipients ||
3463 filter_test != FTEST_NONE || bi_option)
3466 address_test_mode && (smtp_input || extract_recipients ||
3467 filter_test != FTEST_NONE || bi_option)
3470 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3474 deliver_selectstring != NULL && queue_interval < 0
3477 msg_action == MSG_LOAD &&
3478 (!expansion_test || expansion_test_message != NULL)
3482 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3486 /* If debugging is set up, set the file and the file descriptor to pass on to
3487 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3488 to run in the foreground. */
3490 if (debug_selector != 0)
3492 debug_file = stderr;
3493 debug_fd = fileno(debug_file);
3494 background_daemon = FALSE;
3495 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3496 if (debug_selector != D_v) /* -v only doesn't show this */
3498 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3499 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3501 if (!version_printed)
3502 show_whats_supported(stderr);
3506 /* When started with root privilege, ensure that the limits on the number of
3507 open files and the number of processes (where that is accessible) are
3508 sufficiently large, or are unset, in case Exim has been called from an
3509 environment where the limits are screwed down. Not all OS have the ability to
3510 change some of these limits. */
3514 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3520 #ifdef RLIMIT_NOFILE
3521 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3523 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3525 rlp.rlim_cur = rlp.rlim_max = 0;
3528 /* I originally chose 1000 as a nice big number that was unlikely to
3529 be exceeded. It turns out that some older OS have a fixed upper limit of
3532 if (rlp.rlim_cur < 1000)
3534 rlp.rlim_cur = rlp.rlim_max = 1000;
3535 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3537 rlp.rlim_cur = rlp.rlim_max = 256;
3538 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3539 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3546 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3548 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3550 rlp.rlim_cur = rlp.rlim_max = 0;
3553 #ifdef RLIM_INFINITY
3554 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3556 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3558 if (rlp.rlim_cur < 1000)
3560 rlp.rlim_cur = rlp.rlim_max = 1000;
3562 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3563 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3569 /* Exim is normally entered as root (but some special configurations are
3570 possible that don't do this). However, it always spins off sub-processes that
3571 set their uid and gid as required for local delivery. We don't want to pass on
3572 any extra groups that root may belong to, so we want to get rid of them all at
3575 We need to obey setgroups() at this stage, before possibly giving up root
3576 privilege for a changed configuration file, but later on we might need to
3577 check on the additional groups for the admin user privilege - can't do that
3578 till after reading the config, which might specify the exim gid. Therefore,
3579 save the group list here first. */
3581 group_count = getgroups(NGROUPS_MAX, group_list);
3582 if (group_count < 0)
3584 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3588 /* There is a fundamental difference in some BSD systems in the matter of
3589 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3590 known not to be different. On the "different" systems there is a single group
3591 list, and the first entry in it is the current group. On all other versions of
3592 Unix there is a supplementary group list, which is in *addition* to the current
3593 group. Consequently, to get rid of all extraneous groups on a "standard" system
3594 you pass over 0 groups to setgroups(), while on a "different" system you pass
3595 over a single group - the current group, which is always the first group in the
3596 list. Calling setgroups() with zero groups on a "different" system results in
3597 an error return. The following code should cope with both types of system.
3599 However, if this process isn't running as root, setgroups() can't be used
3600 since you have to be root to run it, even if throwing away groups. Not being
3601 root here happens only in some unusual configurations. We just ignore the
3604 if (setgroups(0, NULL) != 0)
3606 if (setgroups(1, group_list) != 0 && !unprivileged)
3608 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3613 /* If the configuration file name has been altered by an argument on the
3614 command line (either a new file name or a macro definition) and the caller is
3615 not root, or if this is a filter testing run, remove any setuid privilege the
3616 program has and run as the underlying user.
3618 The exim user is locked out of this, which severely restricts the use of -C
3621 Otherwise, set the real ids to the effective values (should be root unless run
3622 from inetd, which it can either be root or the exim uid, if one is configured).
3624 There is a private mechanism for bypassing some of this, in order to make it
3625 possible to test lots of configurations automatically, without having either to
3626 recompile each time, or to patch in an actual configuration file name and other
3627 values (such as the path name). If running in the test harness, pretend that
3628 configuration file changes and macro definitions haven't happened. */
3631 (!trusted_config || /* Config changed, or */
3632 !macros_trusted()) && /* impermissible macros and */
3633 real_uid != root_uid && /* Not root, and */
3634 !running_in_test_harness /* Not fudged */
3636 expansion_test /* expansion testing */
3638 filter_test != FTEST_NONE) /* Filter testing */
3640 setgroups(group_count, group_list);
3641 exim_setugid(real_uid, real_gid, FALSE,
3642 US"-C, -D, -be or -bf forces real uid");
3643 removed_privilege = TRUE;
3645 /* In the normal case when Exim is called like this, stderr is available
3646 and should be used for any logging information because attempts to write
3647 to the log will usually fail. To arrange this, we unset really_exim. However,
3648 if no stderr is available there is no point - we might as well have a go
3649 at the log (if it fails, syslog will be written).
3651 Note that if the invoker is Exim, the logs remain available. Messing with
3652 this causes unlogged successful deliveries. */
3654 if ((log_stderr != NULL) && (real_uid != exim_uid))
3655 really_exim = FALSE;
3658 /* Privilege is to be retained for the moment. It may be dropped later,
3659 depending on the job that this Exim process has been asked to do. For now, set
3660 the real uid to the effective so that subsequent re-execs of Exim are done by a
3663 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3665 /* If testing a filter, open the file(s) now, before wasting time doing other
3666 setups and reading the message. */
3668 if ((filter_test & FTEST_SYSTEM) != 0)
3670 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3673 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3675 return EXIT_FAILURE;
3679 if ((filter_test & FTEST_USER) != 0)
3681 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3684 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3686 return EXIT_FAILURE;
3690 /* Initialise lookup_list
3691 If debugging, already called above via version reporting.
3692 In either case, we initialise the list of available lookups while running
3693 as root. All dynamically modules are loaded from a directory which is
3694 hard-coded into the binary and is code which, if not a module, would be
3695 part of Exim already. Ability to modify the content of the directory
3696 is equivalent to the ability to modify a setuid binary!
3698 This needs to happen before we read the main configuration. */
3701 /* Read the main runtime configuration data; this gives up if there
3702 is a failure. It leaves the configuration file open so that the subsequent
3703 configuration data for delivery can be read if needed. */
3707 /* If an action on specific messages is requested, or if a daemon or queue
3708 runner is being started, we need to know if Exim was called by an admin user.
3709 This is the case if the real user is root or exim, or if the real group is
3710 exim, or if one of the supplementary groups is exim or a group listed in
3711 admin_groups. We don't fail all message actions immediately if not admin_user,
3712 since some actions can be performed by non-admin users. Instead, set admin_user
3713 for later interrogation. */
3715 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3720 for (i = 0; i < group_count; i++)
3722 if (group_list[i] == exim_gid) admin_user = TRUE;
3723 else if (admin_groups != NULL)
3725 for (j = 1; j <= (int)(admin_groups[0]); j++)
3726 if (admin_groups[j] == group_list[i])
3727 { admin_user = TRUE; break; }
3729 if (admin_user) break;
3733 /* Another group of privileged users are the trusted users. These are root,
3734 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3735 are permitted to specify sender_addresses with -f on the command line, and
3736 other message parameters as well. */
3738 if (real_uid == root_uid || real_uid == exim_uid)
3739 trusted_caller = TRUE;
3744 if (trusted_users != NULL)
3746 for (i = 1; i <= (int)(trusted_users[0]); i++)
3747 if (trusted_users[i] == real_uid)
3748 { trusted_caller = TRUE; break; }
3751 if (!trusted_caller && trusted_groups != NULL)
3753 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3755 if (trusted_groups[i] == real_gid)
3756 trusted_caller = TRUE;
3757 else for (j = 0; j < group_count; j++)
3759 if (trusted_groups[i] == group_list[j])
3760 { trusted_caller = TRUE; break; }
3762 if (trusted_caller) break;
3767 /* Handle the decoding of logging options. */
3769 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3770 log_selector_string, log_options, log_options_count, US"log", 0);
3774 debug_printf("configuration file is %s\n", config_main_filename);
3775 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3776 log_extra_selector);
3779 /* If domain literals are not allowed, check the sender address that was
3780 supplied with -f. Ditto for a stripped trailing dot. */
3782 if (sender_address != NULL)
3784 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3786 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3787 "allowed\n", sender_address);
3788 return EXIT_FAILURE;
3790 if (f_end_dot && !strip_trailing_dot)
3792 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3793 "(trailing dot not allowed)\n", sender_address);
3794 return EXIT_FAILURE;
3798 /* See if an admin user overrode our logging. */
3800 if (cmdline_syslog_name != NULL)
3804 syslog_processname = cmdline_syslog_name;
3805 log_file_path = string_copy(CUS"syslog");
3809 /* not a panic, non-privileged users should not be able to spam paniclog */
3811 "exim: you lack sufficient privilege to specify syslog process name\n");
3812 return EXIT_FAILURE;
3816 /* Paranoia check of maximum lengths of certain strings. There is a check
3817 on the length of the log file path in log.c, which will come into effect
3818 if there are any calls to write the log earlier than this. However, if we
3819 get this far but the string is very long, it is better to stop now than to
3820 carry on and (e.g.) receive a message and then have to collapse. The call to
3821 log_write() from here will cause the ultimate panic collapse if the complete
3822 file name exceeds the buffer length. */
3824 if (Ustrlen(log_file_path) > 200)
3825 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3826 "log_file_path is longer than 200 chars: aborting");
3828 if (Ustrlen(pid_file_path) > 200)
3829 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3830 "pid_file_path is longer than 200 chars: aborting");
3832 if (Ustrlen(spool_directory) > 200)
3833 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3834 "spool_directory is longer than 200 chars: aborting");
3836 /* Length check on the process name given to syslog for its TAG field,
3837 which is only permitted to be 32 characters or less. See RFC 3164. */
3839 if (Ustrlen(syslog_processname) > 32)
3840 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3841 "syslog_processname is longer than 32 chars: aborting");
3847 log_write(0, LOG_MAIN, "%s", log_oneline);
3848 return EXIT_SUCCESS;
3851 return EXIT_FAILURE;
3854 /* In some operating systems, the environment variable TMPDIR controls where
3855 temporary files are created; Exim doesn't use these (apart from when delivering
3856 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3857 If TMPDIR is found in the environment, reset it to the value defined in the
3858 TMPDIR macro, if this macro is defined. */
3863 for (p = USS environ; *p != NULL; p++)
3865 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3866 Ustrcmp(*p+7, TMPDIR) != 0)
3868 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3869 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3871 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3877 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3878 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3879 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3880 called by a user who has set the TZ variable. This then affects the timestamps
3881 in log files and in Received: headers, and any created Date: header lines. The
3882 required timezone is settable in the configuration file, so nothing can be done
3883 about this earlier - but hopefully nothing will normally be logged earlier than
3884 this. We have to make a new environment if TZ is wrong, but don't bother if
3885 timestamps_utc is set, because then all times are in UTC anyway. */
3887 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3889 timestamps_utc = TRUE;
3893 uschar *envtz = US getenv("TZ");
3894 if ((envtz == NULL && timezone_string != NULL) ||
3896 (timezone_string == NULL ||
3897 Ustrcmp(timezone_string, envtz) != 0)))
3899 uschar **p = USS environ;
3903 while (*p++ != NULL) count++;
3904 if (envtz == NULL) count++;
3905 newp = new = malloc(sizeof(uschar *) * (count + 1));
3906 for (p = USS environ; *p != NULL; p++)
3908 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3911 if (timezone_string != NULL)
3913 *newp = malloc(Ustrlen(timezone_string) + 4);
3914 sprintf(CS *newp++, "TZ=%s", timezone_string);
3919 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3920 tod_stamp(tod_log));
3924 /* Handle the case when we have removed the setuid privilege because of -C or
3925 -D. This means that the caller of Exim was not root.
3927 There is a problem if we were running as the Exim user. The sysadmin may
3928 expect this case to retain privilege because "the binary was called by the
3929 Exim user", but it hasn't, because either the -D option set macros, or the
3930 -C option set a non-trusted configuration file. There are two possibilities:
3932 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3933 to do message deliveries. Thus, the fact that it is running as a
3934 non-privileged user is plausible, and might be wanted in some special
3935 configurations. However, really_exim will have been set false when
3936 privilege was dropped, to stop Exim trying to write to its normal log
3937 files. Therefore, re-enable normal log processing, assuming the sysadmin
3938 has set up the log directory correctly.
3940 (2) If deliver_drop_privilege is not set, the configuration won't work as
3941 apparently intended, and so we log a panic message. In order to retain
3942 root for -C or -D, the caller must either be root or be invoking a
3943 trusted configuration file (when deliver_drop_privilege is false). */
3945 if (removed_privilege && (!trusted_config || macros != NULL) &&
3946 real_uid == exim_uid)
3948 if (deliver_drop_privilege)
3949 really_exim = TRUE; /* let logging work normally */
3951 log_write(0, LOG_MAIN|LOG_PANIC,
3952 "exim user lost privilege for using %s option",
3953 trusted_config? "-D" : "-C");
3956 /* Start up Perl interpreter if Perl support is configured and there is a
3957 perl_startup option, and the configuration or the command line specifies
3958 initializing starting. Note that the global variables are actually called
3959 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3962 if (perl_start_option != 0)
3963 opt_perl_at_start = (perl_start_option > 0);
3964 if (opt_perl_at_start && opt_perl_startup != NULL)
3967 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3968 errstr = init_perl(opt_perl_startup);
3971 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3972 return EXIT_FAILURE;
3974 opt_perl_started = TRUE;
3976 #endif /* EXIM_PERL */
3978 /* Log the arguments of the call if the configuration file said so. This is
3979 a debugging feature for finding out what arguments certain MUAs actually use.
3980 Don't attempt it if logging is disabled, or if listing variables or if
3981 verifying/testing addresses or expansions. */
3983 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3984 && really_exim && !list_options && !checking)
3987 uschar *p = big_buffer;
3989 Ustrcpy(p, "cwd= (failed)");
3990 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3992 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3994 for (i = 0; i < argc; i++)
3996 int len = Ustrlen(argv[i]);
3999 if (p + len + 8 >= big_buffer + big_buffer_size)
4002 log_write(0, LOG_MAIN, "%s", big_buffer);
4003 Ustrcpy(big_buffer, "...");
4006 printing = string_printing(argv[i]);
4007 if (printing[0] == 0) quote = US"\""; else
4009 uschar *pp = printing;
4011 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4013 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4014 (p - big_buffer) - 4), printing, quote);
4018 if ((log_extra_selector & LX_arguments) != 0)
4019 log_write(0, LOG_MAIN, "%s", big_buffer);
4021 debug_printf("%s\n", big_buffer);
4024 /* Set the working directory to be the top-level spool directory. We don't rely
4025 on this in the code, which always uses fully qualified names, but it's useful
4026 for core dumps etc. Don't complain if it fails - the spool directory might not
4027 be generally accessible and calls with the -C option (and others) have lost
4028 privilege by now. Before the chdir, we try to ensure that the directory exists.
4031 if (Uchdir(spool_directory) != 0)
4034 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4035 dummy = /* quieten compiler */ Uchdir(spool_directory);
4038 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4039 alias file. Exim doesn't have such a concept, but this call is screwed into
4040 Sun's YP makefiles. Handle this by calling a configured script, as the real
4041 user who called Exim. The -oA option can be used to pass an argument to the
4046 (void)fclose(config_file);
4047 if (bi_command != NULL)
4051 argv[i++] = bi_command;
4052 if (alias_arg != NULL) argv[i++] = alias_arg;
4055 setgroups(group_count, group_list);
4056 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4058 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4059 (argv[1] == NULL)? US"" : argv[1]);
4061 execv(CS argv[0], (char *const *)argv);
4062 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4067 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4072 /* We moved the admin/trusted check to be immediately after reading the
4073 configuration file. We leave these prints here to ensure that syslog setup,
4074 logfile setup, and so on has already happened. */
4076 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4077 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4079 /* Only an admin user may start the daemon or force a queue run in the default
4080 configuration, but the queue run restriction can be relaxed. Only an admin
4081 user may request that a message be returned to its sender forthwith. Only an
4082 admin user may specify a debug level greater than D_v (because it might show
4083 passwords, etc. in lookup queries). Only an admin user may request a queue
4084 count. Only an admin user can use the test interface to scan for email
4085 (because Exim will be in the spool dir and able to look at mails). */
4089 BOOL debugset = (debug_selector & ~D_v) != 0;
4090 if (deliver_give_up || daemon_listen || malware_test_file ||
4091 (count_queue && queue_list_requires_admin) ||
4092 (list_queue && queue_list_requires_admin) ||
4093 (queue_interval >= 0 && prod_requires_admin) ||
4094 (debugset && !running_in_test_harness))
4096 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4101 /* If the real user is not root or the exim uid, the argument for passing
4102 in an open TCP/IP connection for another message is not permitted, nor is
4103 running with the -N option for any delivery action, unless this call to exim is
4104 one that supplied an input message, or we are using a patched exim for
4105 regression testing. */
4107 if (real_uid != root_uid && real_uid != exim_uid &&
4108 (continue_hostname != NULL ||
4110 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4111 )) && !running_in_test_harness)
4113 fprintf(stderr, "exim: Permission denied\n");
4114 return EXIT_FAILURE;
4117 /* If the caller is not trusted, certain arguments are ignored when running for
4118 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4119 Note that authority for performing certain actions on messages is tested in the
4120 queue_action() function. */
4122 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4124 sender_host_name = sender_host_address = interface_address =
4125 sender_ident = received_protocol = NULL;
4126 sender_host_port = interface_port = 0;
4127 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4130 /* If a sender host address is set, extract the optional port number off the
4131 end of it and check its syntax. Do the same thing for the interface address.
4132 Exim exits if the syntax is bad. */
4136 if (sender_host_address != NULL)
4137 sender_host_port = check_port(sender_host_address);
4138 if (interface_address != NULL)
4139 interface_port = check_port(interface_address);
4142 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4147 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4148 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4152 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4153 return EXIT_FAILURE;
4157 /* If an SMTP message is being received check to see if the standard input is a
4158 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4159 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4164 union sockaddr_46 inetd_sock;
4165 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4166 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4168 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4169 if (family == AF_INET || family == AF_INET6)
4171 union sockaddr_46 interface_sock;
4172 size = sizeof(interface_sock);
4174 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4175 interface_address = host_ntoa(-1, &interface_sock, NULL,
4178 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4180 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4183 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4184 NULL, &sender_host_port);
4185 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4186 "inetd is not supported when mua_wrapper is set");
4191 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4192 return EXIT_FAILURE;
4198 /* If the load average is going to be needed while receiving a message, get it
4199 now for those OS that require the first call to os_getloadavg() to be done as
4200 root. There will be further calls later for each message received. */
4202 #ifdef LOAD_AVG_NEEDS_ROOT
4203 if (receiving_message &&
4204 (queue_only_load >= 0 ||
4205 (is_inetd && smtp_load_reserve >= 0)
4208 load_average = OS_GETLOADAVG();
4212 /* The queue_only configuration option can be overridden by -odx on the command
4213 line, except that if queue_only_override is false, queue_only cannot be unset
4214 from the command line. */
4216 if (queue_only_set && (queue_only_override || arg_queue_only))
4217 queue_only = arg_queue_only;
4219 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4222 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4223 if (arg_smtp_receive_timeout >= 0)
4224 smtp_receive_timeout = arg_smtp_receive_timeout;
4226 /* If Exim was started with root privilege, unless we have already removed the
4227 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4228 except when starting the daemon or doing some kind of delivery or address
4229 testing (-bt). These are the only cases when root need to be retained. We run
4230 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4231 retained only for starting the daemon. We always do the initgroups() in this
4232 situation (controlled by the TRUE below), in order to be as close as possible
4233 to the state Exim usually runs in. */
4235 if (!unprivileged && /* originally had root AND */
4236 !removed_privilege && /* still got root AND */
4237 !daemon_listen && /* not starting the daemon */
4238 queue_interval <= 0 && /* (either kind of daemon) */
4240 deliver_drop_privilege || /* requested unprivileged */
4242 queue_interval < 0 && /* not running the queue */
4243 (msg_action_arg < 0 || /* and */
4244 msg_action != MSG_DELIVER) && /* not delivering and */
4245 (!checking || !address_test_mode) /* not address checking */
4249 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4252 /* When we are retaining a privileged uid, we still change to the exim gid. */
4257 rv = setgid(exim_gid);
4258 /* Impact of failure is that some stuff might end up with an incorrect group.
4259 We track this for failures from root, since any attempt to change privilege
4260 by root should succeed and failures should be examined. For non-root,
4261 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4262 no need to complain then. */
4265 if (!(unprivileged || removed_privilege))
4268 "exim: changing group failed: %s\n", strerror(errno));
4272 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4273 (long int)exim_gid, strerror(errno));
4277 /* Handle a request to scan a file for malware */
4278 if (malware_test_file)
4280 #ifdef WITH_CONTENT_SCAN
4282 set_process_info("scanning file for malware");
4283 result = malware_in_file(malware_test_file);
4286 printf("No malware found.\n");
4291 printf("Malware lookup returned non-okay/fail: %d\n", result);
4295 printf("Malware found: %s\n", malware_name);
4297 printf("Malware scan detected malware of unknown name.\n");
4299 printf("Malware scanning not enabled at compile time.\n");
4304 /* Handle a request to list the delivery queue */
4308 set_process_info("listing the queue");
4309 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4313 /* Handle a request to count the delivery queue */
4317 set_process_info("counting the queue");
4322 /* Handle actions on specific messages, except for the force delivery and
4323 message load actions, which are done below. Some actions take a whole list of
4324 message ids, which are known to continue up to the end of the arguments. Others
4325 take a single message id and then operate on the recipients list. */
4327 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4329 int yield = EXIT_SUCCESS;
4330 set_process_info("acting on specified messages");
4332 if (!one_msg_action)
4334 for (i = msg_action_arg; i < argc; i++)
4335 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4336 yield = EXIT_FAILURE;
4339 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4340 recipients_arg)) yield = EXIT_FAILURE;
4344 /* We used to set up here to skip reading the ACL section, on
4345 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4346 Now, since the intro of the ${acl } expansion, ACL definitions may be
4347 needed in transports so we lost the optimisation. */
4351 /* The configuration data will have been read into POOL_PERM because we won't
4352 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4353 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4354 configuration were read into POOL_MAIN, because we don't do any resets till
4355 later on. However, it seems right, and it does ensure that both pools get used.
4358 store_pool = POOL_MAIN;
4360 /* Handle the -brt option. This is for checking out retry configurations.
4361 The next three arguments are a domain name or a complete address, and
4362 optionally two error numbers. All it does is to call the function that
4363 scans the retry configuration data. */
4365 if (test_retry_arg >= 0)
4367 retry_config *yield;
4368 int basic_errno = 0;
4372 if (test_retry_arg >= argc)
4374 printf("-brt needs a domain or address argument\n");
4375 exim_exit(EXIT_FAILURE);
4377 s1 = argv[test_retry_arg++];
4380 /* If the first argument contains no @ and no . it might be a local user
4381 or it might be a single-component name. Treat as a domain. */
4383 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4385 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4386 "being \ntreated as a one-component domain, not as a local part.\n\n",
4390 /* There may be an optional second domain arg. */
4392 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4393 s2 = argv[test_retry_arg++];
4395 /* The final arg is an error name */
4397 if (test_retry_arg < argc)
4399 uschar *ss = argv[test_retry_arg];
4401 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4404 printf("%s\n", CS error);
4405 return EXIT_FAILURE;
4408 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4409 code > 100 as an error is for matching codes to the decade. Turn them into
4410 a real error code, off the decade. */
4412 if (basic_errno == ERRNO_MAIL4XX ||
4413 basic_errno == ERRNO_RCPT4XX ||
4414 basic_errno == ERRNO_DATA4XX)
4416 int code = (more_errno >> 8) & 255;
4418 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4419 else if (code > 100)
4420 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4424 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4425 if (yield == NULL) printf("No retry information found\n"); else
4428 more_errno = yield->more_errno;
4429 printf("Retry rule: %s ", yield->pattern);
4431 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4433 printf("quota%s%s ",
4434 (more_errno > 0)? "_" : "",
4435 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4437 else if (yield->basic_errno == ECONNREFUSED)
4439 printf("refused%s%s ",
4440 (more_errno > 0)? "_" : "",
4441 (more_errno == 'M')? "MX" :
4442 (more_errno == 'A')? "A" : "");
4444 else if (yield->basic_errno == ETIMEDOUT)
4447 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4449 if (more_errno != 0) printf("_%s",
4450 (more_errno == 'M')? "MX" : "A");
4453 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4454 printf("auth_failed ");
4457 for (r = yield->rules; r != NULL; r = r->next)
4459 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4460 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4466 printf(",%d.", x/1000);
4480 exim_exit(EXIT_SUCCESS);
4483 /* Handle a request to list one or more configuration options */
4484 /* If -n was set, we suppress some information */
4488 set_process_info("listing variables");
4489 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4490 else for (i = recipients_arg; i < argc; i++)
4493 (Ustrcmp(argv[i], "router") == 0 ||
4494 Ustrcmp(argv[i], "transport") == 0 ||
4495 Ustrcmp(argv[i], "authenticator") == 0 ||
4496 Ustrcmp(argv[i], "macro") == 0))
4498 readconf_print(argv[i+1], argv[i], flag_n);
4501 else readconf_print(argv[i], NULL, flag_n);
4503 exim_exit(EXIT_SUCCESS);
4507 /* Handle a request to deliver one or more messages that are already on the
4508 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4509 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4511 Delivery of specific messages is typically used for a small number when
4512 prodding by hand (when the option forced_delivery will be set) or when
4513 re-execing to regain root privilege. Each message delivery must happen in a
4514 separate process, so we fork a process for each one, and run them sequentially
4515 so that debugging output doesn't get intertwined, and to avoid spawning too
4516 many processes if a long list is given. However, don't fork for the last one;
4517 this saves a process in the common case when Exim is called to deliver just one
4520 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4522 if (prod_requires_admin && !admin_user)
4524 fprintf(stderr, "exim: Permission denied\n");
4525 exim_exit(EXIT_FAILURE);
4527 set_process_info("delivering specified messages");
4528 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4529 for (i = msg_action_arg; i < argc; i++)
4534 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4535 else if ((pid = fork()) == 0)
4537 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4538 _exit(EXIT_SUCCESS);
4542 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4544 exim_exit(EXIT_FAILURE);
4548 exim_exit(EXIT_SUCCESS);
4552 /* If only a single queue run is requested, without SMTP listening, we can just
4553 turn into a queue runner, with an optional starting message id. */
4555 if (queue_interval == 0 && !daemon_listen)
4557 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4558 (start_queue_run_id == NULL)? US"" : US" starting at ",
4559 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4560 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4561 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4562 set_process_info("running the queue (single queue run)");
4563 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4564 exim_exit(EXIT_SUCCESS);
4568 /* Find the login name of the real user running this process. This is always
4569 needed when receiving a message, because it is written into the spool file. It
4570 may also be used to construct a from: or a sender: header, and in this case we
4571 need the user's full name as well, so save a copy of it, checked for RFC822
4572 syntax and munged if necessary, if it hasn't previously been set by the -F
4573 argument. We may try to get the passwd entry more than once, in case NIS or
4574 other delays are in evidence. Save the home directory for use in filter testing
4579 if ((pw = getpwuid(real_uid)) != NULL)
4581 originator_login = string_copy(US pw->pw_name);
4582 originator_home = string_copy(US pw->pw_dir);
4584 /* If user name has not been set by -F, set it from the passwd entry
4585 unless -f has been used to set the sender address by a trusted user. */
4587 if (originator_name == NULL)
4589 if (sender_address == NULL ||
4590 (!trusted_caller && filter_test == FTEST_NONE))
4592 uschar *name = US pw->pw_gecos;
4593 uschar *amp = Ustrchr(name, '&');
4596 /* Most Unix specify that a '&' character in the gecos field is
4597 replaced by a copy of the login name, and some even specify that
4598 the first character should be upper cased, so that's what we do. */
4603 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4604 amp - name, name, &loffset, originator_login, amp + 1);
4605 buffer[loffset] = toupper(buffer[loffset]);
4609 /* If a pattern for matching the gecos field was supplied, apply
4610 it and then expand the name string. */
4612 if (gecos_pattern != NULL && gecos_name != NULL)
4615 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4617 if (regex_match_and_setup(re, name, 0, -1))
4619 uschar *new_name = expand_string(gecos_name);
4621 if (new_name != NULL)
4623 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4624 "gecos field \"%s\"\n", new_name, name);
4627 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4628 "\"%s\": %s\n", gecos_name, expand_string_message);
4630 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4631 "gecos field \"%s\"\n", gecos_pattern, name);
4632 store_free((void *)re);
4634 originator_name = string_copy(name);
4637 /* A trusted caller has used -f but not -F */
4639 else originator_name = US"";
4642 /* Break the retry loop */
4647 if (++i > finduser_retries) break;
4651 /* If we cannot get a user login, log the incident and give up, unless the
4652 configuration specifies something to use. When running in the test harness,
4653 any setting of unknown_login overrides the actual name. */
4655 if (originator_login == NULL || running_in_test_harness)
4657 if (unknown_login != NULL)
4659 originator_login = expand_string(unknown_login);
4660 if (originator_name == NULL && unknown_username != NULL)
4661 originator_name = expand_string(unknown_username);
4662 if (originator_name == NULL) originator_name = US"";
4664 if (originator_login == NULL)
4665 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4669 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4672 originator_name = string_copy(parse_fix_phrase(originator_name,
4673 Ustrlen(originator_name), big_buffer, big_buffer_size));
4675 /* If a message is created by this call of Exim, the uid/gid of its originator
4676 are those of the caller. These values are overridden if an existing message is
4677 read in from the spool. */
4679 originator_uid = real_uid;
4680 originator_gid = real_gid;
4682 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4683 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4685 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4686 returns. We leave this till here so that the originator_ fields are available
4687 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4690 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4694 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4695 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4696 "mua_wrapper is set");
4701 /* If the sender ident has not been set (by a trusted caller) set it to
4702 the caller. This will get overwritten below for an inetd call. If a trusted
4703 caller has set it empty, unset it. */
4705 if (sender_ident == NULL) sender_ident = originator_login;
4706 else if (sender_ident[0] == 0) sender_ident = NULL;
4708 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4709 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4710 originator_* variables set. */
4712 if (test_rewrite_arg >= 0)
4714 really_exim = FALSE;
4715 if (test_rewrite_arg >= argc)
4717 printf("-brw needs an address argument\n");
4718 exim_exit(EXIT_FAILURE);
4720 rewrite_test(argv[test_rewrite_arg]);
4721 exim_exit(EXIT_SUCCESS);
4724 /* A locally-supplied message is considered to be coming from a local user
4725 unless a trusted caller supplies a sender address with -f, or is passing in the
4726 message via SMTP (inetd invocation or otherwise). */
4728 if ((sender_address == NULL && !smtp_input) ||
4729 (!trusted_caller && filter_test == FTEST_NONE))
4731 sender_local = TRUE;
4733 /* A trusted caller can supply authenticated_sender and authenticated_id
4734 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4735 defaults except when host checking. */
4737 if (authenticated_sender == NULL && !host_checking)
4738 authenticated_sender = string_sprintf("%s@%s", originator_login,
4739 qualify_domain_sender);
4740 if (authenticated_id == NULL && !host_checking)
4741 authenticated_id = originator_login;
4744 /* Trusted callers are always permitted to specify the sender address.
4745 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4746 is specified is the empty address. However, if a trusted caller does not
4747 specify a sender address for SMTP input, we leave sender_address unset. This
4748 causes the MAIL commands to be honoured. */
4750 if ((!smtp_input && sender_address == NULL) ||
4751 !receive_check_set_sender(sender_address))
4753 /* Either the caller is not permitted to set a general sender, or this is
4754 non-SMTP input and the trusted caller has not set a sender. If there is no
4755 sender, or if a sender other than <> is set, override with the originator's
4756 login (which will get qualified below), except when checking things. */
4758 if (sender_address == NULL /* No sender_address set */
4760 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4761 !checking && /* Not running tests, AND */
4762 filter_test == FTEST_NONE)) /* Not testing a filter */
4764 sender_address = originator_login;
4765 sender_address_forced = FALSE;
4766 sender_address_domain = 0;
4770 /* Remember whether an untrusted caller set the sender address */
4772 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4774 /* Ensure that the sender address is fully qualified unless it is the empty
4775 address, which indicates an error message, or doesn't exist (root caller, smtp
4776 interface, no -f argument). */
4778 if (sender_address != NULL && sender_address[0] != 0 &&
4779 sender_address_domain == 0)
4780 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4781 qualify_domain_sender);
4783 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4785 /* Handle a request to verify a list of addresses, or test them for delivery.
4786 This must follow the setting of the sender address, since routers can be
4787 predicated upon the sender. If no arguments are given, read addresses from
4788 stdin. Set debug_level to at least D_v to get full output for address testing.
4791 if (verify_address_mode || address_test_mode)
4794 int flags = vopt_qualify;
4796 if (verify_address_mode)
4798 if (!verify_as_sender) flags |= vopt_is_recipient;
4799 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4804 flags |= vopt_is_recipient;
4805 debug_selector |= D_v;
4806 debug_file = stderr;
4807 debug_fd = fileno(debug_file);
4808 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4811 if (recipients_arg < argc)
4813 while (recipients_arg < argc)
4815 uschar *s = argv[recipients_arg++];
4818 BOOL finished = FALSE;
4819 uschar *ss = parse_find_address_end(s, FALSE);
4820 if (*ss == ',') *ss = 0; else finished = TRUE;
4821 test_address(s, flags, &exit_value);
4824 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4831 uschar *s = get_stdinput(NULL, NULL);
4832 if (s == NULL) break;
4833 test_address(s, flags, &exit_value);
4837 exim_exit(exit_value);
4840 /* Handle expansion checking. Either expand items on the command line, or read
4841 from stdin if there aren't any. If -Mset was specified, load the message so
4842 that its variables can be used, but restrict this facility to admin users.
4843 Otherwise, if -bem was used, read a message from stdin. */
4847 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4849 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4852 fprintf(stderr, "exim: permission denied\n");
4855 message_id = argv[msg_action_arg];
4856 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4857 if (!spool_open_datafile(message_id))
4858 printf ("Failed to load message datafile %s\n", message_id);
4859 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4860 printf ("Failed to load message %s\n", message_id);
4863 /* Read a test message from a file. We fudge it up to be on stdin, saving
4864 stdin itself for later reading of expansion strings. */
4866 else if (expansion_test_message != NULL)
4868 int save_stdin = dup(0);
4869 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4872 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4874 return EXIT_FAILURE;
4877 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4878 message_ended = END_NOTENDED;
4879 read_message_body(receive_msg(extract_recipients));
4880 message_linecount += body_linecount;
4881 (void)dup2(save_stdin, 0);
4882 (void)close(save_stdin);
4883 clearerr(stdin); /* Required by Darwin */
4886 /* Allow $recipients for this testing */
4888 enable_dollar_recipients = TRUE;
4890 /* Expand command line items */
4892 if (recipients_arg < argc)
4894 while (recipients_arg < argc)
4896 uschar *s = argv[recipients_arg++];
4897 uschar *ss = expand_string(s);
4898 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4899 else printf("%s\n", CS ss);
4907 char *(*fn_readline)(const char *) = NULL;
4908 void (*fn_addhist)(const char *) = NULL;
4911 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4917 uschar *source = get_stdinput(fn_readline, fn_addhist);
4918 if (source == NULL) break;
4919 ss = expand_string(source);
4921 printf ("Failed: %s\n", expand_string_message);
4922 else printf("%s\n", CS ss);
4926 if (dlhandle != NULL) dlclose(dlhandle);
4930 /* The data file will be open after -Mset */
4932 if (deliver_datafile >= 0)
4934 (void)close(deliver_datafile);
4935 deliver_datafile = -1;
4938 exim_exit(EXIT_SUCCESS);
4942 /* The active host name is normally the primary host name, but it can be varied
4943 for hosts that want to play several parts at once. We need to ensure that it is
4944 set for host checking, and for receiving messages. */
4946 smtp_active_hostname = primary_hostname;
4947 if (raw_active_hostname != NULL)
4949 uschar *nah = expand_string(raw_active_hostname);
4952 if (!expand_string_forcedfail)
4953 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4954 "(smtp_active_hostname): %s", raw_active_hostname,
4955 expand_string_message);
4957 else if (nah[0] != 0) smtp_active_hostname = nah;
4960 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4961 given IP address so that the blocking and relay configuration can be tested.
4962 Unless a sender_ident was set by -oMt, we discard it (the default is the
4963 caller's login name). An RFC 1413 call is made only if we are running in the
4964 test harness and an incoming interface and both ports are specified, because
4965 there is no TCP/IP call to find the ident for. */
4972 if (!sender_ident_set)
4974 sender_ident = NULL;
4975 if (running_in_test_harness && sender_host_port != 0 &&
4976 interface_address != NULL && interface_port != 0)
4977 verify_get_ident(1413);
4980 /* In case the given address is a non-canonical IPv6 address, canonicize
4981 it. The code works for both IPv4 and IPv6, as it happens. */
4983 size = host_aton(sender_host_address, x);
4984 sender_host_address = store_get(48); /* large enough for full IPv6 */
4985 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4987 /* Now set up for testing */
4989 host_build_sender_fullhost();
4993 sender_local = FALSE;
4994 sender_host_notsocket = TRUE;
4995 debug_file = stderr;
4996 debug_fd = fileno(debug_file);
4997 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4998 "**** but without any ident (RFC 1413) callback.\n"
4999 "**** This is not for real!\n\n",
5000 sender_host_address);
5002 if (verify_check_host(&hosts_connection_nolog) == OK)
5003 log_write_selector &= ~L_smtp_connection;
5004 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5006 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5007 because a log line has already been written for all its failure exists
5008 (usually "connection refused: <reason>") and writing another one is
5009 unnecessary clutter. */
5011 if (smtp_start_session())
5013 reset_point = store_get(0);
5016 store_reset(reset_point);
5017 if (smtp_setup_msg() <= 0) break;
5018 if (!receive_msg(FALSE)) break;
5022 exim_exit(EXIT_SUCCESS);
5026 /* Arrange for message reception if recipients or SMTP were specified;
5027 otherwise complain unless a version print (-bV) happened or this is a filter
5028 verification test or info dump.
5029 In the former case, show the configuration file name. */
5031 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5033 if (version_printed)
5035 printf("Configuration file is %s\n", config_main_filename);
5036 return EXIT_SUCCESS;
5039 if (info_flag != CMDINFO_NONE)
5041 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5042 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5045 if (filter_test == FTEST_NONE)
5046 exim_usage(called_as);
5050 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5051 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5052 that we are not called from inetd, because that is rejected above. The
5053 following configuration settings are forced here:
5055 (1) Synchronous delivery (-odi)
5056 (2) Errors to stderr (-oep == -oeq)
5057 (3) No parallel remote delivery
5058 (4) Unprivileged delivery
5060 We don't force overall queueing options because there are several of them;
5061 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5062 to override any SMTP queueing. */
5066 synchronous_delivery = TRUE;
5067 arg_error_handling = ERRORS_STDERR;
5068 remote_max_parallel = 1;
5069 deliver_drop_privilege = TRUE;
5071 queue_smtp_domains = NULL;
5075 /* Prepare to accept one or more new messages on the standard input. When a
5076 message has been read, its id is returned in message_id[]. If doing immediate
5077 delivery, we fork a delivery process for each received message, except for the
5078 last one, where we can save a process switch.
5080 It is only in non-smtp mode that error_handling is allowed to be changed from
5081 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5082 sendmail error modes other than -oem ever actually used? Later: yes.) */
5084 if (!smtp_input) error_handling = arg_error_handling;
5086 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5087 logging being sent down the socket and make an identd call to get the
5092 (void)fclose(stderr);
5093 exim_nullstd(); /* Re-open to /dev/null */
5094 verify_get_ident(IDENT_PORT);
5095 host_build_sender_fullhost();
5096 set_process_info("handling incoming connection from %s via inetd",
5100 /* If the sender host address has been set, build sender_fullhost if it hasn't
5101 already been done (which it will have been for inetd). This caters for the
5102 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5103 so that the test for IP options is skipped for -bs input. */
5105 if (sender_host_address != NULL && sender_fullhost == NULL)
5107 host_build_sender_fullhost();
5108 set_process_info("handling incoming connection from %s via -oMa",
5110 sender_host_notsocket = TRUE;
5113 /* Otherwise, set the sender host as unknown except for inetd calls. This
5114 prevents host checking in the case of -bs not from inetd and also for -bS. */
5116 else if (!is_inetd) sender_host_unknown = TRUE;
5118 /* If stdout does not exist, then dup stdin to stdout. This can happen
5119 if exim is started from inetd. In this case fd 0 will be set to the socket,
5120 but fd 1 will not be set. This also happens for passed SMTP channels. */
5122 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5124 /* Set up the incoming protocol name and the state of the program. Root is
5125 allowed to force received protocol via the -oMr option above. If we have come
5126 via inetd, the process info has already been set up. We don't set
5127 received_protocol here for smtp input, as it varies according to
5128 batch/HELO/EHLO/AUTH/TLS. */
5132 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5133 smtp_batched_input? "batched " : "",
5134 (sender_address!= NULL)? sender_address : originator_login);
5138 if (received_protocol == NULL)
5139 received_protocol = string_sprintf("local%s", called_as);
5140 set_process_info("accepting a local non-SMTP message from <%s>",
5144 /* Initialize the session_local_queue-only flag (this will be ignored if
5145 mua_wrapper is set) */
5148 session_local_queue_only = queue_only;
5150 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5151 the spool if so configured. On failure, we must not attempt to send an error
5152 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5153 error code is given.) */
5155 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5157 fprintf(stderr, "exim: insufficient disk space\n");
5158 return EXIT_FAILURE;
5161 /* If this is smtp input of any kind, real or batched, handle the start of the
5164 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5165 because a log line has already been written for all its failure exists
5166 (usually "connection refused: <reason>") and writing another one is
5167 unnecessary clutter. */
5173 if (verify_check_host(&hosts_connection_nolog) == OK)
5174 log_write_selector &= ~L_smtp_connection;
5175 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5176 if (!smtp_start_session())
5179 exim_exit(EXIT_SUCCESS);
5183 /* Otherwise, set up the input size limit here. */
5187 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5188 if (expand_string_message != NULL)
5190 if (thismessage_size_limit == -1)
5191 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5192 "message_size_limit: %s", expand_string_message);
5194 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5195 "message_size_limit: %s", expand_string_message);
5199 /* Loop for several messages when reading SMTP input. If we fork any child
5200 processes, we don't want to wait for them unless synchronous delivery is
5201 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5202 same as SIG_DFL, despite the fact that documentation often lists the default as
5203 "ignore". This is a confusing area. This is what I know:
5205 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5206 processes that complete simply to go away without ever becoming defunct. You
5207 can't then wait for them - but we don't want to wait for them in the
5208 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5209 happen for all OS (e.g. *BSD is different).
5211 But that's not the end of the story. Some (many? all?) systems have the
5212 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5213 has by default, so it seems that the difference is merely one of default
5214 (compare restarting vs non-restarting signals).
5216 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5217 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5218 of the loop below. Paranoia rules.
5220 February 2003: That's *still* not the end of the story. There are now versions
5221 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5222 process then calls waitpid(), a grumble is written to the system log, because
5223 this is logically inconsistent. In other words, it doesn't like the paranoia.
5224 As a consequenc of this, the waitpid() below is now excluded if we are sure
5225 that SIG_IGN works. */
5227 if (!synchronous_delivery)
5230 struct sigaction act;
5231 act.sa_handler = SIG_IGN;
5232 sigemptyset(&(act.sa_mask));
5233 act.sa_flags = SA_NOCLDWAIT;
5234 sigaction(SIGCHLD, &act, NULL);
5236 signal(SIGCHLD, SIG_IGN);
5240 /* Save the current store pool point, for resetting at the start of
5241 each message, and save the real sender address, if any. */
5243 reset_point = store_get(0);
5244 real_sender_address = sender_address;
5246 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5247 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5252 store_reset(reset_point);
5255 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5256 input and build the recipients list, before calling receive_msg() to read the
5257 message proper. Whatever sender address is given in the SMTP transaction is
5258 often ignored for local senders - we use the actual sender, which is normally
5259 either the underlying user running this process or a -f argument provided by
5260 a trusted caller. It is saved in real_sender_address. The test for whether to
5261 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5266 if ((rc = smtp_setup_msg()) > 0)
5268 if (real_sender_address != NULL &&
5269 !receive_check_set_sender(sender_address))
5271 sender_address = raw_sender = real_sender_address;
5272 sender_address_unrewritten = NULL;
5275 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5276 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5277 the very end. The result of the ACL is ignored (as for other non-SMTP
5278 messages). It is run for its potential side effects. */
5280 if (smtp_batched_input && acl_not_smtp_start != NULL)
5282 uschar *user_msg, *log_msg;
5283 enable_dollar_recipients = TRUE;
5284 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5285 &user_msg, &log_msg);
5286 enable_dollar_recipients = FALSE;
5289 /* Now get the data for the message */
5291 more = receive_msg(extract_recipients);
5292 if (message_id[0] == 0)
5295 smtp_log_no_mail(); /* Log no mail if configured */
5296 exim_exit(EXIT_FAILURE);
5301 smtp_log_no_mail(); /* Log no mail if configured */
5302 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5306 /* In the non-SMTP case, we have all the information from the command
5307 line, but must process it in case it is in the more general RFC822
5308 format, and in any case, to detect syntax errors. Also, it appears that
5309 the use of comma-separated lists as single arguments is common, so we
5310 had better support them. */
5316 int count = argc - recipients_arg;
5317 uschar **list = argv + recipients_arg;
5319 /* These options cannot be changed dynamically for non-SMTP messages */
5321 active_local_sender_retain = local_sender_retain;
5322 active_local_from_check = local_from_check;
5324 /* Save before any rewriting */
5326 raw_sender = string_copy(sender_address);
5328 /* Loop for each argument */
5330 for (i = 0; i < count; i++)
5332 int start, end, domain;
5334 uschar *s = list[i];
5336 /* Loop for each comma-separated address */
5340 BOOL finished = FALSE;
5342 uschar *ss = parse_find_address_end(s, FALSE);
5344 if (*ss == ',') *ss = 0; else finished = TRUE;
5346 /* Check max recipients - if -t was used, these aren't recipients */
5348 if (recipients_max > 0 && ++rcount > recipients_max &&
5349 !extract_recipients)
5351 if (error_handling == ERRORS_STDERR)
5353 fprintf(stderr, "exim: too many recipients\n");
5354 exim_exit(EXIT_FAILURE);
5359 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5360 errors_sender_rc : EXIT_FAILURE;
5365 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5367 if (domain == 0 && !allow_unqualified_recipient)
5370 errmess = US"unqualified recipient address not allowed";
5373 if (recipient == NULL)
5375 if (error_handling == ERRORS_STDERR)
5377 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5378 string_printing(list[i]), errmess);
5379 exim_exit(EXIT_FAILURE);
5385 eblock.text1 = string_printing(list[i]);
5386 eblock.text2 = errmess;
5388 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5389 errors_sender_rc : EXIT_FAILURE;
5393 receive_add_recipient(recipient, -1);
5396 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5400 /* Show the recipients when debugging */
5405 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5406 if (recipients_list != NULL)
5408 debug_printf("Recipients:\n");
5409 for (i = 0; i < recipients_count; i++)
5410 debug_printf(" %s\n", recipients_list[i].address);
5414 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5415 ignored; rejecting here would just add complication, and it can just as
5416 well be done later. Allow $recipients to be visible in the ACL. */
5418 if (acl_not_smtp_start != NULL)
5420 uschar *user_msg, *log_msg;
5421 enable_dollar_recipients = TRUE;
5422 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5423 &user_msg, &log_msg);
5424 enable_dollar_recipients = FALSE;
5427 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5428 will just read the headers for the message, and not write anything onto the
5431 message_ended = END_NOTENDED;
5432 more = receive_msg(extract_recipients);
5434 /* more is always FALSE here (not SMTP message) when reading a message
5435 for real; when reading the headers of a message for filter testing,
5436 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5438 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5439 } /* Non-SMTP message reception */
5441 /* If this is a filter testing run, there are headers in store, but
5442 no message on the spool. Run the filtering code in testing mode, setting
5443 the domain to the qualify domain and the local part to the current user,
5444 unless they have been set by options. The prefix and suffix are left unset
5445 unless specified. The the return path is set to to the sender unless it has
5446 already been set from a return-path header in the message. */
5448 if (filter_test != FTEST_NONE)
5450 deliver_domain = (ftest_domain != NULL)?
5451 ftest_domain : qualify_domain_recipient;
5452 deliver_domain_orig = deliver_domain;
5453 deliver_localpart = (ftest_localpart != NULL)?
5454 ftest_localpart : originator_login;
5455 deliver_localpart_orig = deliver_localpart;
5456 deliver_localpart_prefix = ftest_prefix;
5457 deliver_localpart_suffix = ftest_suffix;
5458 deliver_home = originator_home;
5460 if (return_path == NULL)
5462 printf("Return-path copied from sender\n");
5463 return_path = string_copy(sender_address);
5467 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5469 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5471 receive_add_recipient(
5472 string_sprintf("%s%s%s@%s",
5473 (ftest_prefix == NULL)? US"" : ftest_prefix,
5475 (ftest_suffix == NULL)? US"" : ftest_suffix,
5476 deliver_domain), -1);
5478 printf("Recipient = %s\n", recipients_list[0].address);
5479 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5480 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5482 if (chdir("/")) /* Get away from wherever the user is running this from */
5484 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5485 exim_exit(EXIT_FAILURE);
5488 /* Now we run either a system filter test, or a user filter test, or both.
5489 In the latter case, headers added by the system filter will persist and be
5490 available to the user filter. We need to copy the filter variables
5493 if ((filter_test & FTEST_SYSTEM) != 0)
5495 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5496 exim_exit(EXIT_FAILURE);
5499 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5501 if ((filter_test & FTEST_USER) != 0)
5503 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5504 exim_exit(EXIT_FAILURE);
5507 exim_exit(EXIT_SUCCESS);
5510 /* Else act on the result of message reception. We should not get here unless
5511 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5512 will be TRUE. If it is not, check on the number of messages received in this
5515 if (!session_local_queue_only &&
5516 smtp_accept_queue_per_connection > 0 &&
5517 receive_messagecount > smtp_accept_queue_per_connection)
5519 session_local_queue_only = TRUE;
5520 queue_only_reason = 2;
5523 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5524 and queue_only_load is set, check that the load average is below it. If it is
5525 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5526 default), we put the whole session into queue_only mode. It then remains this
5527 way for any subsequent messages on the same SMTP connection. This is a
5528 deliberate choice; even though the load average may fall, it doesn't seem
5529 right to deliver later messages on the same call when not delivering earlier
5530 ones. However, there are odd cases where this is not wanted, so this can be
5531 changed by setting queue_only_load_latch false. */
5533 local_queue_only = session_local_queue_only;
5534 if (!local_queue_only && queue_only_load >= 0)
5536 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5537 if (local_queue_only)
5539 queue_only_reason = 3;
5540 if (queue_only_load_latch) session_local_queue_only = TRUE;
5544 /* If running as an MUA wrapper, all queueing options and freezing options
5548 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5550 /* Log the queueing here, when it will get a message id attached, but
5551 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5554 if (local_queue_only) switch(queue_only_reason)
5557 log_write(L_delay_delivery,
5558 LOG_MAIN, "no immediate delivery: more than %d messages "
5559 "received in one connection", smtp_accept_queue_per_connection);
5563 log_write(L_delay_delivery,
5564 LOG_MAIN, "no immediate delivery: load average %.2f",
5565 (double)load_average/1000.0);
5569 /* Else do the delivery unless the ACL or local_scan() called for queue only
5570 or froze the message. Always deliver in a separate process. A fork failure is
5571 not a disaster, as the delivery will eventually happen on a subsequent queue
5572 run. The search cache must be tidied before the fork, as the parent will
5573 do it before exiting. The child will trigger a lookup failure and
5574 thereby defer the delivery if it tries to use (for example) a cached ldap
5575 connection that the parent has called unbind on. */
5577 else if (!queue_only_policy && !deliver_freeze)
5582 if ((pid = fork()) == 0)
5585 close_unwanted(); /* Close unwanted file descriptors and TLS */
5586 exim_nullstd(); /* Ensure std{in,out,err} exist */
5588 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5589 mode, deliver_drop_privilege is forced TRUE). */
5591 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5593 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5595 /* Control does not return here. */
5598 /* No need to re-exec */
5600 rc = deliver_message(message_id, FALSE, FALSE);
5602 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5603 EXIT_SUCCESS : EXIT_FAILURE);
5608 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5609 "process: %s", strerror(errno));
5612 /* In the parent, wait if synchronous delivery is required. This will
5613 always be the case in MUA wrapper mode. */
5615 else if (synchronous_delivery)
5618 while (wait(&status) != pid);
5619 if ((status & 0x00ff) != 0)
5620 log_write(0, LOG_MAIN|LOG_PANIC,
5621 "process %d crashed with signal %d while delivering %s",
5622 (int)pid, status & 0x00ff, message_id);
5623 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5627 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5628 automatically reaps children (see comments above the loop), clear away any
5629 finished subprocesses here, in case there are lots of messages coming in
5630 from the same source. */
5632 #ifndef SIG_IGN_WORKS
5633 while (waitpid(-1, NULL, WNOHANG) > 0);
5637 exim_exit(EXIT_SUCCESS); /* Never returns */
5638 return 0; /* To stop compiler warning */