1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
136 int ovector[3*(EXPAND_MAXN+1)];
137 uschar * s = string_copy(subject); /* de-constifying */
138 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
139 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
141 if (n == 0) n = EXPAND_MAXN + 1;
145 expand_nmax = (setup < 0)? 0 : setup + 1;
146 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
148 expand_nstring[expand_nmax] = s + ovector[nn];
149 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 /*************************************************
160 * Set up processing details *
161 *************************************************/
163 /* Save a text string for dumping when SIGUSR1 is received.
164 Do checks for overruns.
166 Arguments: format and arguments, as for printf()
171 set_process_info(const char *format, ...)
175 sprintf(CS process_info, "%5d ", (int)getpid());
176 len = Ustrlen(process_info);
177 va_start(ap, format);
178 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
179 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
180 len = Ustrlen(process_info);
181 process_info[len+0] = '\n';
182 process_info[len+1] = '\0';
183 process_info_len = len + 1;
184 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
191 /*************************************************
192 * Handler for SIGUSR1 *
193 *************************************************/
195 /* SIGUSR1 causes any exim process to write to the process log details of
196 what it is currently doing. It will only be used if the OS is capable of
197 setting up a handler that causes automatic restarting of any system call
198 that is in progress at the time.
200 This function takes care to be signal-safe.
202 Argument: the signal number (SIGUSR1)
207 usr1_handler(int sig)
211 os_restarting_signal(sig, usr1_handler);
213 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
216 /* If we are already running as the Exim user, try to create it in the
217 current process (assuming spool_directory exists). Otherwise, if we are
218 root, do the creation in an exim:exim subprocess. */
220 int euid = geteuid();
221 if (euid == exim_uid)
222 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
223 else if (euid == root_uid)
224 fd = log_create_as_exim(process_log_path);
227 /* If we are neither exim nor root, or if we failed to create the log file,
228 give up. There is not much useful we can do with errors, since we don't want
229 to disrupt whatever is going on outside the signal handler. */
233 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
239 /*************************************************
241 *************************************************/
243 /* This handler is enabled most of the time that Exim is running. The handler
244 doesn't actually get used unless alarm() has been called to set a timer, to
245 place a time limit on a system call of some kind. When the handler is run, it
248 There are some other SIGALRM handlers that are used in special cases when more
249 than just a flag setting is required; for example, when reading a message's
250 input. These are normally set up in the code module that uses them, and the
251 SIGALRM handler is reset to this one afterwards.
253 Argument: the signal value (SIGALRM)
258 sigalrm_handler(int sig)
260 sig = sig; /* Keep picky compilers happy */
262 os_non_restarting_signal(SIGALRM, sigalrm_handler);
267 /*************************************************
268 * Sleep for a fractional time interval *
269 *************************************************/
271 /* This function is called by millisleep() and exim_wait_tick() to wait for a
272 period of time that may include a fraction of a second. The coding is somewhat
273 tedious. We do not expect setitimer() ever to fail, but if it does, the process
274 will wait for ever, so we panic in this instance. (There was a case of this
275 when a bug in a function that calls milliwait() caused it to pass invalid data.
276 That's when I added the check. :-)
278 We assume it to be not worth sleeping for under 100us; this value will
279 require revisiting as hardware advances. This avoids the issue of
280 a zero-valued timer setting meaning "never fire".
282 Argument: an itimerval structure containing the interval
287 milliwait(struct itimerval *itval)
290 sigset_t old_sigmask;
292 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
294 (void)sigemptyset(&sigmask); /* Empty mask */
295 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
296 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
297 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
298 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
299 "setitimer() failed: %s", strerror(errno));
300 (void)sigfillset(&sigmask); /* All signals */
301 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
302 (void)sigsuspend(&sigmask); /* Until SIGALRM */
303 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
309 /*************************************************
310 * Millisecond sleep function *
311 *************************************************/
313 /* The basic sleep() function has a granularity of 1 second, which is too rough
314 in some cases - for example, when using an increasing delay to slow down
317 Argument: number of millseconds
324 struct itimerval itval;
325 itval.it_interval.tv_sec = 0;
326 itval.it_interval.tv_usec = 0;
327 itval.it_value.tv_sec = msec/1000;
328 itval.it_value.tv_usec = (msec % 1000) * 1000;
334 /*************************************************
335 * Compare microsecond times *
336 *************************************************/
343 Returns: -1, 0, or +1
347 exim_tvcmp(struct timeval *t1, struct timeval *t2)
349 if (t1->tv_sec > t2->tv_sec) return +1;
350 if (t1->tv_sec < t2->tv_sec) return -1;
351 if (t1->tv_usec > t2->tv_usec) return +1;
352 if (t1->tv_usec < t2->tv_usec) return -1;
359 /*************************************************
360 * Clock tick wait function *
361 *************************************************/
363 /* Exim uses a time + a pid to generate a unique identifier in two places: its
364 message IDs, and in file names for maildir deliveries. Because some OS now
365 re-use pids within the same second, sub-second times are now being used.
366 However, for absolute certaintly, we must ensure the clock has ticked before
367 allowing the relevant process to complete. At the time of implementation of
368 this code (February 2003), the speed of processors is such that the clock will
369 invariably have ticked already by the time a process has done its job. This
370 function prepares for the time when things are faster - and it also copes with
371 clocks that go backwards.
374 then_tv A timeval which was used to create uniqueness; its usec field
375 has been rounded down to the value of the resolution.
376 We want to be sure the current time is greater than this.
377 resolution The resolution that was used to divide the microseconds
378 (1 for maildir, larger for message ids)
384 exim_wait_tick(struct timeval *then_tv, int resolution)
386 struct timeval now_tv;
387 long int now_true_usec;
389 (void)gettimeofday(&now_tv, NULL);
390 now_true_usec = now_tv.tv_usec;
391 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
393 if (exim_tvcmp(&now_tv, then_tv) <= 0)
395 struct itimerval itval;
396 itval.it_interval.tv_sec = 0;
397 itval.it_interval.tv_usec = 0;
398 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
399 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
401 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
402 negative value for the microseconds is possible only in the case when "now"
403 is more than a second less than "then". That means that itval.it_value.tv_sec
404 is greater than zero. The following correction is therefore safe. */
406 if (itval.it_value.tv_usec < 0)
408 itval.it_value.tv_usec += 1000000;
409 itval.it_value.tv_sec -= 1;
412 DEBUG(D_transport|D_receive)
414 if (!running_in_test_harness)
416 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
417 then_tv->tv_sec, (long) then_tv->tv_usec,
418 now_tv.tv_sec, (long) now_tv.tv_usec);
419 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
420 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
431 /*************************************************
432 * Call fopen() with umask 777 and adjust mode *
433 *************************************************/
435 /* Exim runs with umask(0) so that files created with open() have the mode that
436 is specified in the open() call. However, there are some files, typically in
437 the spool directory, that are created with fopen(). They end up world-writeable
438 if no precautions are taken. Although the spool directory is not accessible to
439 the world, this is an untidiness. So this is a wrapper function for fopen()
440 that sorts out the mode of the created file.
443 filename the file name
444 options the fopen() options
445 mode the required mode
447 Returns: the fopened FILE or NULL
451 modefopen(const uschar *filename, const char *options, mode_t mode)
453 mode_t saved_umask = umask(0777);
454 FILE *f = Ufopen(filename, options);
455 (void)umask(saved_umask);
456 if (f != NULL) (void)fchmod(fileno(f), mode);
463 /*************************************************
464 * Ensure stdin, stdout, and stderr exist *
465 *************************************************/
467 /* Some operating systems grumble if an exec() happens without a standard
468 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
469 file will be opened and will use these fd values, and then some other bit of
470 code will assume, for example, that it can write error messages to stderr.
471 This function ensures that fds 0, 1, and 2 are open if they do not already
472 exist, by connecting them to /dev/null.
474 This function is also used to ensure that std{in,out,err} exist at all times,
475 so that if any library that Exim calls tries to use them, it doesn't crash.
487 for (i = 0; i <= 2; i++)
489 if (fstat(i, &statbuf) < 0 && errno == EBADF)
491 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
492 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
493 string_open_failed(errno, "/dev/null"));
494 if (devnull != i) (void)dup2(devnull, i);
497 if (devnull > 2) (void)close(devnull);
503 /*************************************************
504 * Close unwanted file descriptors for delivery *
505 *************************************************/
507 /* This function is called from a new process that has been forked to deliver
508 an incoming message, either directly, or using exec.
510 We want any smtp input streams to be closed in this new process. However, it
511 has been observed that using fclose() here causes trouble. When reading in -bS
512 input, duplicate copies of messages have been seen. The files will be sharing a
513 file pointer with the parent process, and it seems that fclose() (at least on
514 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
515 least sometimes. Hence we go for closing the underlying file descriptors.
517 If TLS is active, we want to shut down the TLS library, but without molesting
518 the parent's SSL connection.
520 For delivery of a non-SMTP message, we want to close stdin and stdout (and
521 stderr unless debugging) because the calling process might have set them up as
522 pipes and be waiting for them to close before it waits for the submission
523 process to terminate. If they aren't closed, they hold up the calling process
524 until the initial delivery process finishes, which is not what we want.
526 Exception: We do want it for synchronous delivery!
528 And notwithstanding all the above, if D_resolver is set, implying resolver
529 debugging, leave stdout open, because that's where the resolver writes its
532 When we close stderr (which implies we've also closed stdout), we also get rid
533 of any controlling terminal.
545 tls_close(TRUE, FALSE); /* Shut down the TLS library */
547 (void)close(fileno(smtp_in));
548 (void)close(fileno(smtp_out));
553 (void)close(0); /* stdin */
554 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
555 if (debug_selector == 0) /* stderr */
557 if (!synchronous_delivery)
570 /*************************************************
572 *************************************************/
574 /* This function sets a new uid and gid permanently, optionally calling
575 initgroups() to set auxiliary groups. There are some special cases when running
576 Exim in unprivileged modes. In these situations the effective uid will not be
577 root; if we already have the right effective uid/gid, and don't need to
578 initialize any groups, leave things as they are.
583 igflag TRUE if initgroups() wanted
584 msg text to use in debugging output and failure log
586 Returns: nothing; bombs out on failure
590 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
592 uid_t euid = geteuid();
593 gid_t egid = getegid();
595 if (euid == root_uid || euid != uid || egid != gid || igflag)
597 /* At least one OS returns +1 for initgroups failure, so just check for
602 struct passwd *pw = getpwuid(uid);
605 if (initgroups(pw->pw_name, gid) != 0)
606 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
607 (long int)uid, strerror(errno));
609 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
610 "no passwd entry for uid=%ld", (long int)uid);
613 if (setgid(gid) < 0 || setuid(uid) < 0)
615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
616 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
620 /* Debugging output included uid/gid and all groups */
624 int group_count, save_errno;
625 gid_t group_list[NGROUPS_MAX];
626 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
627 (long int)geteuid(), (long int)getegid(), (long int)getpid());
628 group_count = getgroups(NGROUPS_MAX, group_list);
630 debug_printf(" auxiliary group list:");
634 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
636 else if (group_count < 0)
637 debug_printf(" <error: %s>", strerror(save_errno));
638 else debug_printf(" <none>");
646 /*************************************************
648 *************************************************/
650 /* Exim exits via this function so that it always clears up any open
656 Returns: does not return
664 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
665 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
672 /*************************************************
673 * Extract port from host address *
674 *************************************************/
676 /* Called to extract the port from the values given to -oMa and -oMi.
677 It also checks the syntax of the address, and terminates it before the
678 port data when a port is extracted.
681 address the address, with possible port on the end
683 Returns: the port, or zero if there isn't one
684 bombs out on a syntax error
688 check_port(uschar *address)
690 int port = host_address_extract_port(address);
691 if (string_is_ip_address(address, NULL) == 0)
693 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
701 /*************************************************
702 * Test/verify an address *
703 *************************************************/
705 /* This function is called by the -bv and -bt code. It extracts a working
706 address from a full RFC 822 address. This isn't really necessary per se, but it
707 has the effect of collapsing source routes.
711 flags flag bits for verify_address()
712 exit_value to be set for failures
718 test_address(uschar *s, int flags, int *exit_value)
720 int start, end, domain;
721 uschar *parse_error = NULL;
722 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
726 fprintf(stdout, "syntax error: %s\n", parse_error);
731 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
732 -1, -1, NULL, NULL, NULL);
733 if (rc == FAIL) *exit_value = 2;
734 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
740 /*************************************************
741 * Show supported features *
742 *************************************************/
744 /* This function is called for -bV/--version and for -d to output the optional
745 features of the current Exim binary.
747 Arguments: a FILE for printing
752 show_whats_supported(FILE *f)
756 #ifdef DB_VERSION_STRING
757 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
758 #elif defined(BTREEVERSION) && defined(HASHVERSION)
760 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
762 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
764 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
765 fprintf(f, "Probably ndbm\n");
766 #elif defined(USE_TDB)
767 fprintf(f, "Using tdb\n");
770 fprintf(f, "Probably GDBM (native mode)\n");
772 fprintf(f, "Probably GDBM (compatibility mode)\n");
776 fprintf(f, "Support for:");
777 #ifdef SUPPORT_CRYPTEQ
778 fprintf(f, " crypteq");
781 fprintf(f, " iconv()");
786 #ifdef HAVE_SETCLASSRESOURCES
787 fprintf(f, " use_setclassresources");
796 fprintf(f, " Expand_dlfunc");
798 #ifdef USE_TCP_WRAPPERS
799 fprintf(f, " TCPwrappers");
803 fprintf(f, " GnuTLS");
805 fprintf(f, " OpenSSL");
808 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
809 fprintf(f, " translate_ip_address");
811 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
812 fprintf(f, " move_frozen_messages");
814 #ifdef WITH_CONTENT_SCAN
815 fprintf(f, " Content_Scanning");
820 #ifdef WITH_OLD_DEMIME
821 fprintf(f, " Old_Demime");
829 #ifdef EXPERIMENTAL_SPF
830 fprintf(f, " Experimental_SPF");
832 #ifdef EXPERIMENTAL_SRS
833 fprintf(f, " Experimental_SRS");
835 #ifdef EXPERIMENTAL_BRIGHTMAIL
836 fprintf(f, " Experimental_Brightmail");
838 #ifdef EXPERIMENTAL_DANE
839 fprintf(f, " Experimental_DANE");
841 #ifdef EXPERIMENTAL_DCC
842 fprintf(f, " Experimental_DCC");
844 #ifdef EXPERIMENTAL_DMARC
845 fprintf(f, " Experimental_DMARC");
847 #ifdef EXPERIMENTAL_PROXY
848 fprintf(f, " Experimental_Proxy");
850 #ifdef EXPERIMENTAL_EVENT
851 fprintf(f, " Experimental_Event");
853 #ifdef EXPERIMENTAL_REDIS
854 fprintf(f, " Experimental_Redis");
856 #ifdef EXPERIMENTAL_DSN
857 fprintf(f, " Experimental_DSN");
861 fprintf(f, "Lookups (built-in):");
862 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
863 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
865 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
868 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
869 fprintf(f, " dbm dbmjz dbmnz");
871 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
872 fprintf(f, " dnsdb");
874 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
875 fprintf(f, " dsearch");
877 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
878 fprintf(f, " ibase");
880 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
881 fprintf(f, " ldap ldapdn ldapm");
883 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
884 fprintf(f, " mysql");
886 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
887 fprintf(f, " nis nis0");
889 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
890 fprintf(f, " nisplus");
892 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
893 fprintf(f, " oracle");
895 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
896 fprintf(f, " passwd");
898 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
899 fprintf(f, " pgsql");
901 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
902 fprintf(f, " sqlite");
904 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
905 fprintf(f, " testdb");
907 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
908 fprintf(f, " whoson");
912 fprintf(f, "Authenticators:");
914 fprintf(f, " cram_md5");
916 #ifdef AUTH_CYRUS_SASL
917 fprintf(f, " cyrus_sasl");
920 fprintf(f, " dovecot");
923 fprintf(f, " gsasl");
925 #ifdef AUTH_HEIMDAL_GSSAPI
926 fprintf(f, " heimdal_gssapi");
928 #ifdef AUTH_PLAINTEXT
929 fprintf(f, " plaintext");
936 fprintf(f, "Routers:");
938 fprintf(f, " accept");
940 #ifdef ROUTER_DNSLOOKUP
941 fprintf(f, " dnslookup");
943 #ifdef ROUTER_IPLITERAL
944 fprintf(f, " ipliteral");
946 #ifdef ROUTER_IPLOOKUP
947 fprintf(f, " iplookup");
949 #ifdef ROUTER_MANUALROUTE
950 fprintf(f, " manualroute");
952 #ifdef ROUTER_QUERYPROGRAM
953 fprintf(f, " queryprogram");
955 #ifdef ROUTER_REDIRECT
956 fprintf(f, " redirect");
960 fprintf(f, "Transports:");
961 #ifdef TRANSPORT_APPENDFILE
962 fprintf(f, " appendfile");
963 #ifdef SUPPORT_MAILDIR
964 fprintf(f, "/maildir");
966 #ifdef SUPPORT_MAILSTORE
967 fprintf(f, "/mailstore");
973 #ifdef TRANSPORT_AUTOREPLY
974 fprintf(f, " autoreply");
976 #ifdef TRANSPORT_LMTP
979 #ifdef TRANSPORT_PIPE
982 #ifdef TRANSPORT_SMTP
987 if (fixed_never_users[0] > 0)
990 fprintf(f, "Fixed never_users: ");
991 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
992 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
993 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
996 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
998 /* Everything else is details which are only worth reporting when debugging.
999 Perhaps the tls_version_report should move into this too. */
1004 /* clang defines __GNUC__ (at least, for me) so test for it first */
1005 #if defined(__clang__)
1006 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1007 #elif defined(__GNUC__)
1008 fprintf(f, "Compiler: GCC [%s]\n",
1012 "? unknown version ?"
1016 fprintf(f, "Compiler: <unknown>\n");
1020 tls_version_report(f);
1023 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1024 if (authi->version_report) {
1025 (*authi->version_report)(f);
1029 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1030 characters; unless it's an ancient version of PCRE in which case it
1032 #ifndef PCRE_PRERELEASE
1033 #define PCRE_PRERELEASE
1036 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1037 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1039 PCRE_MAJOR, PCRE_MINOR,
1040 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1043 #undef EXPAND_AND_QUOTE
1046 for (i = 0; i < lookup_list_count; i++)
1048 if (lookup_list[i]->version_report)
1049 lookup_list[i]->version_report(f);
1052 #ifdef WHITELIST_D_MACROS
1053 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1055 fprintf(f, "WHITELIST_D_MACROS unset\n");
1057 #ifdef TRUSTED_CONFIG_LIST
1058 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1060 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1067 /*************************************************
1068 * Show auxiliary information about Exim *
1069 *************************************************/
1072 show_exim_information(enum commandline_info request, FILE *stream)
1079 fprintf(stream, "Oops, something went wrong.\n");
1083 "The -bI: flag takes a string indicating which information to provide.\n"
1084 "If the string is not recognised, you'll get this help (on stderr).\n"
1086 " exim -bI:help this information\n"
1087 " exim -bI:dscp dscp value keywords known\n"
1088 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1092 for (pp = exim_sieve_extension_list; *pp; ++pp)
1093 fprintf(stream, "%s\n", *pp);
1096 dscp_list_to_stream(stream);
1102 /*************************************************
1103 * Quote a local part *
1104 *************************************************/
1106 /* This function is used when a sender address or a From: or Sender: header
1107 line is being created from the caller's login, or from an authenticated_id. It
1108 applies appropriate quoting rules for a local part.
1110 Argument: the local part
1111 Returns: the local part, quoted if necessary
1115 local_part_quote(uschar *lpart)
1117 BOOL needs_quote = FALSE;
1122 for (t = lpart; !needs_quote && *t != 0; t++)
1124 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1125 (*t != '.' || t == lpart || t[1] == 0);
1128 if (!needs_quote) return lpart;
1131 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1135 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1138 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1141 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1142 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1143 yield = string_cat(yield, &size, &ptr, nq, 1);
1147 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1155 /*************************************************
1156 * Load readline() functions *
1157 *************************************************/
1159 /* This function is called from testing executions that read data from stdin,
1160 but only when running as the calling user. Currently, only -be does this. The
1161 function loads the readline() function library and passes back the functions.
1162 On some systems, it needs the curses library, so load that too, but try without
1163 it if loading fails. All this functionality has to be requested at build time.
1166 fn_readline_ptr pointer to where to put the readline pointer
1167 fn_addhist_ptr pointer to where to put the addhistory function
1169 Returns: the dlopen handle or NULL on failure
1173 set_readline(char * (**fn_readline_ptr)(const char *),
1174 void (**fn_addhist_ptr)(const char *))
1177 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1179 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1180 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1182 if (dlhandle != NULL)
1184 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1185 * char * readline (const char *prompt);
1186 * void add_history (const char *string);
1188 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1189 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1193 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1202 /*************************************************
1203 * Get a line from stdin for testing things *
1204 *************************************************/
1206 /* This function is called when running tests that can take a number of lines
1207 of input (for example, -be and -bt). It handles continuations and trailing
1208 spaces. And prompting and a blank line output on eof. If readline() is in use,
1209 the arguments are non-NULL and provide the relevant functions.
1212 fn_readline readline function or NULL
1213 fn_addhist addhist function or NULL
1215 Returns: pointer to dynamic memory, or NULL at end of file
1219 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1224 uschar *yield = NULL;
1226 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1230 uschar buffer[1024];
1234 char *readline_line = NULL;
1235 if (fn_readline != NULL)
1237 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1238 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1239 p = US readline_line;
1244 /* readline() not in use */
1247 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1251 /* Handle the line */
1253 ss = p + (int)Ustrlen(p);
1254 while (ss > p && isspace(ss[-1])) ss--;
1258 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1261 yield = string_cat(yield, &size, &ptr, p, ss - p);
1264 if (fn_readline != NULL) free(readline_line);
1267 if (ss == p || yield[ptr-1] != '\\')
1275 if (yield == NULL) printf("\n");
1281 /*************************************************
1282 * Output usage information for the program *
1283 *************************************************/
1285 /* This function is called when there are no recipients
1286 or a specific --help argument was added.
1289 progname information on what name we were called by
1291 Returns: DOES NOT RETURN
1295 exim_usage(uschar *progname)
1298 /* Handle specific program invocation varients */
1299 if (Ustrcmp(progname, US"-mailq") == 0)
1302 "mailq - list the contents of the mail queue\n\n"
1303 "For a list of options, see the Exim documentation.\n");
1307 /* Generic usage - we output this whatever happens */
1309 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1310 "not directly from a shell command line. Options and/or arguments control\n"
1311 "what it does when called. For a list of options, see the Exim documentation.\n");
1318 /*************************************************
1319 * Validate that the macros given are okay *
1320 *************************************************/
1322 /* Typically, Exim will drop privileges if macros are supplied. In some
1323 cases, we want to not do so.
1325 Arguments: none (macros is a global)
1326 Returns: true if trusted, false otherwise
1330 macros_trusted(void)
1332 #ifdef WHITELIST_D_MACROS
1334 uschar *whitelisted, *end, *p, **whites, **w;
1335 int white_count, i, n;
1337 BOOL prev_char_item, found;
1342 #ifndef WHITELIST_D_MACROS
1346 /* We only trust -D overrides for some invoking users:
1347 root, the exim run-time user, the optional config owner user.
1348 I don't know why config-owner would be needed, but since they can own the
1349 config files anyway, there's no security risk to letting them override -D. */
1350 if ( ! ((real_uid == root_uid)
1351 || (real_uid == exim_uid)
1352 #ifdef CONFIGURE_OWNER
1353 || (real_uid == config_uid)
1357 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1361 /* Get a list of macros which are whitelisted */
1362 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1363 prev_char_item = FALSE;
1365 for (p = whitelisted; *p != '\0'; ++p)
1367 if (*p == ':' || isspace(*p))
1372 prev_char_item = FALSE;
1375 if (!prev_char_item)
1376 prev_char_item = TRUE;
1383 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1384 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1389 if (i == white_count)
1391 while (*p != '\0' && p < end)
1397 /* The list of macros should be very short. Accept the N*M complexity. */
1398 for (m = macros; m != NULL; m = m->next)
1401 for (w = whites; *w; ++w)
1402 if (Ustrcmp(*w, m->name) == 0)
1409 if (m->replacement == NULL)
1411 len = Ustrlen(m->replacement);
1414 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1415 0, PCRE_EOPT, NULL, 0);
1418 if (n != PCRE_ERROR_NOMATCH)
1419 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1423 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1429 /*************************************************
1430 * Entry point and high-level code *
1431 *************************************************/
1433 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1434 the appropriate action. All the necessary functions are present in the one
1435 binary. I originally thought one should split it up, but it turns out that so
1436 much of the apparatus is needed in each chunk that one might as well just have
1437 it all available all the time, which then makes the coding easier as well.
1440 argc count of entries in argv
1441 argv argument strings, with argv[0] being the program name
1443 Returns: EXIT_SUCCESS if terminated successfully
1444 EXIT_FAILURE otherwise, except when a message has been sent
1445 to the sender, and -oee was given
1449 main(int argc, char **cargv)
1451 uschar **argv = USS cargv;
1452 int arg_receive_timeout = -1;
1453 int arg_smtp_receive_timeout = -1;
1454 int arg_error_handling = error_handling;
1455 int filter_sfd = -1;
1456 int filter_ufd = -1;
1459 int list_queue_option = 0;
1461 int msg_action_arg = -1;
1462 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1463 int queue_only_reason = 0;
1465 int perl_start_option = 0;
1467 int recipients_arg = argc;
1468 int sender_address_domain = 0;
1469 int test_retry_arg = -1;
1470 int test_rewrite_arg = -1;
1471 BOOL arg_queue_only = FALSE;
1472 BOOL bi_option = FALSE;
1473 BOOL checking = FALSE;
1474 BOOL count_queue = FALSE;
1475 BOOL expansion_test = FALSE;
1476 BOOL extract_recipients = FALSE;
1477 BOOL flag_G = FALSE;
1478 BOOL flag_n = FALSE;
1479 BOOL forced_delivery = FALSE;
1480 BOOL f_end_dot = FALSE;
1481 BOOL deliver_give_up = FALSE;
1482 BOOL list_queue = FALSE;
1483 BOOL list_options = FALSE;
1484 BOOL local_queue_only;
1486 BOOL one_msg_action = FALSE;
1487 BOOL queue_only_set = FALSE;
1488 BOOL receiving_message = TRUE;
1489 BOOL sender_ident_set = FALSE;
1490 BOOL session_local_queue_only;
1492 BOOL removed_privilege = FALSE;
1493 BOOL usage_wanted = FALSE;
1494 BOOL verify_address_mode = FALSE;
1495 BOOL verify_as_sender = FALSE;
1496 BOOL version_printed = FALSE;
1497 uschar *alias_arg = NULL;
1498 uschar *called_as = US"";
1499 uschar *cmdline_syslog_name = NULL;
1500 uschar *start_queue_run_id = NULL;
1501 uschar *stop_queue_run_id = NULL;
1502 uschar *expansion_test_message = NULL;
1503 uschar *ftest_domain = NULL;
1504 uschar *ftest_localpart = NULL;
1505 uschar *ftest_prefix = NULL;
1506 uschar *ftest_suffix = NULL;
1507 uschar *malware_test_file = NULL;
1508 uschar *real_sender_address;
1509 uschar *originator_home = US"/";
1514 struct stat statbuf;
1515 pid_t passed_qr_pid = (pid_t)0;
1516 int passed_qr_pipe = -1;
1517 gid_t group_list[NGROUPS_MAX];
1519 /* For the -bI: flag */
1520 enum commandline_info info_flag = CMDINFO_NONE;
1521 BOOL info_stdout = FALSE;
1523 /* Possible options for -R and -S */
1525 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1527 /* Need to define this in case we need to change the environment in order
1528 to get rid of a bogus time zone. We have to make it char rather than uschar
1529 because some OS define it in /usr/include/unistd.h. */
1531 extern char **environ;
1533 /* If the Exim user and/or group and/or the configuration file owner/group were
1534 defined by ref:name at build time, we must now find the actual uid/gid values.
1535 This is a feature to make the lives of binary distributors easier. */
1537 #ifdef EXIM_USERNAME
1538 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1542 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1546 /* If ref:name uses a number as the name, route_finduser() returns
1547 TRUE with exim_uid set and pw coerced to NULL. */
1549 exim_gid = pw->pw_gid;
1550 #ifndef EXIM_GROUPNAME
1554 "exim: ref:name should specify a usercode, not a group.\n"
1555 "exim: can't let you get away with it unless you also specify a group.\n");
1562 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1568 #ifdef EXIM_GROUPNAME
1569 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1571 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1577 #ifdef CONFIGURE_OWNERNAME
1578 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1580 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1581 CONFIGURE_OWNERNAME);
1586 /* We default the system_filter_user to be the Exim run-time user, as a
1587 sane non-root value. */
1588 system_filter_uid = exim_uid;
1590 #ifdef CONFIGURE_GROUPNAME
1591 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1593 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1594 CONFIGURE_GROUPNAME);
1599 /* In the Cygwin environment, some initialization needs doing. It is fudged
1600 in by means of this macro. */
1606 /* Check a field which is patched when we are running Exim within its
1607 testing harness; do a fast initial check, and then the whole thing. */
1609 running_in_test_harness =
1610 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1612 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1613 at the start of a program; however, it seems that some environments do not
1614 follow this. A "strange" locale can affect the formatting of timestamps, so we
1617 setlocale(LC_ALL, "C");
1619 /* Set up the default handler for timing using alarm(). */
1621 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1623 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1624 because store_malloc writes a log entry on failure. */
1626 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1627 if (log_buffer == NULL)
1629 fprintf(stderr, "exim: failed to get store for log buffer\n");
1633 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1634 NULL when the daemon is run and the file is closed. We have to use this
1635 indirection, because some systems don't allow writing to the variable "stderr".
1638 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1640 /* Arrange for the PCRE regex library to use our store functions. Note that
1641 the normal calls are actually macros that add additional arguments for
1642 debugging purposes so we have to assign specially constructed functions here.
1643 The default is to use store in the stacking pool, but this is overridden in the
1644 regex_must_compile() function. */
1646 pcre_malloc = function_store_get;
1647 pcre_free = function_dummy_free;
1649 /* Ensure there is a big buffer for temporary use in several places. It is put
1650 in malloc store so that it can be freed for enlargement if necessary. */
1652 big_buffer = store_malloc(big_buffer_size);
1654 /* Set up the handler for the data request signal, and set the initial
1655 descriptive text. */
1657 set_process_info("initializing");
1658 os_restarting_signal(SIGUSR1, usr1_handler);
1660 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1661 in the daemon code. For the rest of Exim's uses, we ignore it. */
1663 signal(SIGHUP, SIG_IGN);
1665 /* We don't want to die on pipe errors as the code is written to handle
1666 the write error instead. */
1668 signal(SIGPIPE, SIG_IGN);
1670 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1671 set to SIG_IGN. This causes subprocesses that complete before the parent
1672 process waits for them not to hang around, so when Exim calls wait(), nothing
1673 is there. The wait() code has been made robust against this, but let's ensure
1674 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1675 ending status. We use sigaction rather than plain signal() on those OS where
1676 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1677 problem on AIX with this.) */
1681 struct sigaction act;
1682 act.sa_handler = SIG_DFL;
1683 sigemptyset(&(act.sa_mask));
1685 sigaction(SIGCHLD, &act, NULL);
1688 signal(SIGCHLD, SIG_DFL);
1691 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1696 /* Set up the version number. Set up the leading 'E' for the external form of
1697 message ids, set the pointer to the internal form, and initialize it to
1698 indicate no message being processed. */
1701 message_id_option[0] = '-';
1702 message_id_external = message_id_option + 1;
1703 message_id_external[0] = 'E';
1704 message_id = message_id_external + 1;
1707 /* Set the umask to zero so that any files Exim creates using open() are
1708 created with the modes that it specifies. NOTE: Files created with fopen() have
1709 a problem, which was not recognized till rather late (February 2006). With this
1710 umask, such files will be world writeable. (They are all content scanning files
1711 in the spool directory, which isn't world-accessible, so this is not a
1712 disaster, but it's untidy.) I don't want to change this overall setting,
1713 however, because it will interact badly with the open() calls. Instead, there's
1714 now a function called modefopen() that fiddles with the umask while calling
1719 /* Precompile the regular expression for matching a message id. Keep this in
1720 step with the code that generates ids in the accept.c module. We need to do
1721 this here, because the -M options check their arguments for syntactic validity
1722 using mac_ismsgid, which uses this. */
1725 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1727 /* Precompile the regular expression that is used for matching an SMTP error
1728 code, possibly extended, at the start of an error message. Note that the
1729 terminating whitespace character is included. */
1732 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1735 #ifdef WHITELIST_D_MACROS
1736 /* Precompile the regular expression used to filter the content of macros
1737 given to -D for permissibility. */
1739 regex_whitelisted_macro =
1740 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1744 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1745 this seems to be a generally accepted convention, since one finds symbolic
1746 links called "mailq" in standard OS configurations. */
1748 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1749 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1752 receiving_message = FALSE;
1753 called_as = US"-mailq";
1756 /* If the program is called as "rmail" treat it as equivalent to
1757 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1758 i.e. preventing a single dot on a line from terminating the message, and
1759 returning with zero return code, even in cases of error (provided an error
1760 message has been sent). */
1762 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1763 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1766 called_as = US"-rmail";
1767 errors_sender_rc = EXIT_SUCCESS;
1770 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1771 this is a smail convention. */
1773 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1774 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1776 smtp_input = smtp_batched_input = TRUE;
1777 called_as = US"-rsmtp";
1780 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1781 this is a smail convention. */
1783 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1784 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1787 receiving_message = FALSE;
1788 called_as = US"-runq";
1791 /* If the program is called as "newaliases" treat it as equivalent to
1792 "exim -bi"; this is a sendmail convention. */
1794 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1795 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1798 receiving_message = FALSE;
1799 called_as = US"-newaliases";
1802 /* Save the original effective uid for a couple of uses later. It should
1803 normally be root, but in some esoteric environments it may not be. */
1805 original_euid = geteuid();
1807 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1808 to be the same as the real ones. This makes a difference only if Exim is setuid
1809 (or setgid) to something other than root, which could be the case in some
1810 special configurations. */
1812 real_uid = getuid();
1813 real_gid = getgid();
1815 if (real_uid == root_uid)
1817 rv = setgid(real_gid);
1820 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1821 (long int)real_gid, strerror(errno));
1824 rv = setuid(real_uid);
1827 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1828 (long int)real_uid, strerror(errno));
1833 /* If neither the original real uid nor the original euid was root, Exim is
1834 running in an unprivileged state. */
1836 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1838 /* Scan the program's arguments. Some can be dealt with right away; others are
1839 simply recorded for checking and handling afterwards. Do a high-level switch
1840 on the second character (the one after '-'), to save some effort. */
1842 for (i = 1; i < argc; i++)
1844 BOOL badarg = FALSE;
1845 uschar *arg = argv[i];
1849 /* An argument not starting with '-' is the start of a recipients list;
1850 break out of the options-scanning loop. */
1858 /* An option consistion of -- terminates the options */
1860 if (Ustrcmp(arg, "--") == 0)
1862 recipients_arg = i + 1;
1866 /* Handle flagged options */
1868 switchchar = arg[1];
1871 /* Make all -ex options synonymous with -oex arguments, since that
1872 is assumed by various callers. Also make -qR options synonymous with -R
1873 options, as that seems to be required as well. Allow for -qqR too, and
1874 the same for -S options. */
1876 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1877 Ustrncmp(arg+1, "qR", 2) == 0 ||
1878 Ustrncmp(arg+1, "qS", 2) == 0)
1880 switchchar = arg[2];
1883 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1885 switchchar = arg[3];
1887 queue_2stage = TRUE;
1890 /* Make -r synonymous with -f, since it is a documented alias */
1892 else if (arg[1] == 'r') switchchar = 'f';
1894 /* Make -ov synonymous with -v */
1896 else if (Ustrcmp(arg, "-ov") == 0)
1902 /* deal with --option_aliases */
1903 else if (switchchar == '-')
1905 if (Ustrcmp(argrest, "help") == 0)
1907 usage_wanted = TRUE;
1910 else if (Ustrcmp(argrest, "version") == 0)
1917 /* High-level switch on active initial letter */
1922 /* sendmail uses -Ac and -Am to control which .cf file is used;
1925 if (*argrest == '\0') { badarg = TRUE; break; }
1928 BOOL ignore = FALSE;
1933 if (*(argrest + 1) == '\0')
1937 if (!ignore) { badarg = TRUE; break; }
1941 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1942 so has no need of it. */
1945 if (*argrest == 0) i++; /* Skip over the type */
1950 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1952 /* -bd: Run in daemon mode, awaiting SMTP connections.
1953 -bdf: Ditto, but in the foreground.
1956 if (*argrest == 'd')
1958 daemon_listen = TRUE;
1959 if (*(++argrest) == 'f') background_daemon = FALSE;
1960 else if (*argrest != 0) { badarg = TRUE; break; }
1963 /* -be: Run in expansion test mode
1964 -bem: Ditto, but read a message from a file first
1967 else if (*argrest == 'e')
1969 expansion_test = checking = TRUE;
1970 if (argrest[1] == 'm')
1972 if (++i >= argc) { badarg = TRUE; break; }
1973 expansion_test_message = argv[i];
1976 if (argrest[1] != 0) { badarg = TRUE; break; }
1979 /* -bF: Run system filter test */
1981 else if (*argrest == 'F')
1983 filter_test |= FTEST_SYSTEM;
1984 if (*(++argrest) != 0) { badarg = TRUE; break; }
1985 if (++i < argc) filter_test_sfile = argv[i]; else
1987 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1992 /* -bf: Run user filter test
1993 -bfd: Set domain for filter testing
1994 -bfl: Set local part for filter testing
1995 -bfp: Set prefix for filter testing
1996 -bfs: Set suffix for filter testing
1999 else if (*argrest == 'f')
2001 if (*(++argrest) == 0)
2003 filter_test |= FTEST_USER;
2004 if (++i < argc) filter_test_ufile = argv[i]; else
2006 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2014 fprintf(stderr, "exim: string expected after %s\n", arg);
2017 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2018 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2019 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2020 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2021 else { badarg = TRUE; break; }
2025 /* -bh: Host checking - an IP address must follow. */
2027 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2029 if (++i >= argc) { badarg = TRUE; break; }
2030 sender_host_address = argv[i];
2031 host_checking = checking = log_testing_mode = TRUE;
2032 host_checking_callout = argrest[1] == 'c';
2035 /* -bi: This option is used by sendmail to initialize *the* alias file,
2036 though it has the -oA option to specify a different file. Exim has no
2037 concept of *the* alias file, but since Sun's YP make script calls
2038 sendmail this way, some support must be provided. */
2040 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2042 /* -bI: provide information, of the type to follow after a colon.
2043 This is an Exim flag. */
2045 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2047 uschar *p = &argrest[2];
2048 info_flag = CMDINFO_HELP;
2051 if (strcmpic(p, CUS"sieve") == 0)
2053 info_flag = CMDINFO_SIEVE;
2056 else if (strcmpic(p, CUS"dscp") == 0)
2058 info_flag = CMDINFO_DSCP;
2061 else if (strcmpic(p, CUS"help") == 0)
2068 /* -bm: Accept and deliver message - the default option. Reinstate
2069 receiving_message, which got turned off for all -b options. */
2071 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2073 /* -bmalware: test the filename given for malware */
2075 else if (Ustrcmp(argrest, "malware") == 0)
2077 if (++i >= argc) { badarg = TRUE; break; }
2078 malware_test_file = argv[i];
2081 /* -bnq: For locally originating messages, do not qualify unqualified
2082 addresses. In the envelope, this causes errors; in header lines they
2085 else if (Ustrcmp(argrest, "nq") == 0)
2087 allow_unqualified_sender = FALSE;
2088 allow_unqualified_recipient = FALSE;
2091 /* -bpxx: List the contents of the mail queue, in various forms. If
2092 the option is -bpc, just a queue count is needed. Otherwise, if the
2093 first letter after p is r, then order is random. */
2095 else if (*argrest == 'p')
2097 if (*(++argrest) == 'c')
2100 if (*(++argrest) != 0) badarg = TRUE;
2104 if (*argrest == 'r')
2106 list_queue_option = 8;
2109 else list_queue_option = 0;
2113 /* -bp: List the contents of the mail queue, top-level only */
2115 if (*argrest == 0) {}
2117 /* -bpu: List the contents of the mail queue, top-level undelivered */
2119 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2121 /* -bpa: List the contents of the mail queue, including all delivered */
2123 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2125 /* Unknown after -bp[r] */
2135 /* -bP: List the configuration variables given as the address list.
2136 Force -v, so configuration errors get displayed. */
2138 else if (Ustrcmp(argrest, "P") == 0)
2140 list_options = TRUE;
2141 debug_selector |= D_v;
2142 debug_file = stderr;
2145 /* -brt: Test retry configuration lookup */
2147 else if (Ustrcmp(argrest, "rt") == 0)
2149 test_retry_arg = i + 1;
2153 /* -brw: Test rewrite configuration */
2155 else if (Ustrcmp(argrest, "rw") == 0)
2157 test_rewrite_arg = i + 1;
2161 /* -bS: Read SMTP commands on standard input, but produce no replies -
2162 all errors are reported by sending messages. */
2164 else if (Ustrcmp(argrest, "S") == 0)
2165 smtp_input = smtp_batched_input = receiving_message = TRUE;
2167 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2168 on standard output. */
2170 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2172 /* -bt: address testing mode */
2174 else if (Ustrcmp(argrest, "t") == 0)
2175 address_test_mode = checking = log_testing_mode = TRUE;
2177 /* -bv: verify addresses */
2179 else if (Ustrcmp(argrest, "v") == 0)
2180 verify_address_mode = checking = log_testing_mode = TRUE;
2182 /* -bvs: verify sender addresses */
2184 else if (Ustrcmp(argrest, "vs") == 0)
2186 verify_address_mode = checking = log_testing_mode = TRUE;
2187 verify_as_sender = TRUE;
2190 /* -bV: Print version string and support details */
2192 else if (Ustrcmp(argrest, "V") == 0)
2194 printf("Exim version %s #%s built %s\n", version_string,
2195 version_cnumber, version_date);
2196 printf("%s\n", CS version_copyright);
2197 version_printed = TRUE;
2198 show_whats_supported(stdout);
2201 /* -bw: inetd wait mode, accept a listening socket as stdin */
2203 else if (*argrest == 'w')
2205 inetd_wait_mode = TRUE;
2206 background_daemon = FALSE;
2207 daemon_listen = TRUE;
2208 if (*(++argrest) != '\0')
2210 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2211 if (inetd_wait_timeout <= 0)
2213 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2223 /* -C: change configuration file list; ignore if it isn't really
2224 a change! Enforce a prefix check if required. */
2229 if(++i < argc) argrest = argv[i]; else
2230 { badarg = TRUE; break; }
2232 if (Ustrcmp(config_main_filelist, argrest) != 0)
2234 #ifdef ALT_CONFIG_PREFIX
2236 int len = Ustrlen(ALT_CONFIG_PREFIX);
2237 uschar *list = argrest;
2239 while((filename = string_nextinlist(&list, &sep, big_buffer,
2240 big_buffer_size)) != NULL)
2242 if ((Ustrlen(filename) < len ||
2243 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2244 Ustrstr(filename, "/../") != NULL) &&
2245 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2247 fprintf(stderr, "-C Permission denied\n");
2252 if (real_uid != root_uid)
2254 #ifdef TRUSTED_CONFIG_LIST
2256 if (real_uid != exim_uid
2257 #ifdef CONFIGURE_OWNER
2258 && real_uid != config_uid
2261 trusted_config = FALSE;
2264 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2267 struct stat statbuf;
2269 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2270 (statbuf.st_uid != root_uid /* owner not root */
2271 #ifdef CONFIGURE_OWNER
2272 && statbuf.st_uid != config_uid /* owner not the special one */
2275 (statbuf.st_gid != root_gid /* group not root */
2276 #ifdef CONFIGURE_GROUP
2277 && statbuf.st_gid != config_gid /* group not the special one */
2279 && (statbuf.st_mode & 020) != 0 /* group writeable */
2281 (statbuf.st_mode & 2) != 0) /* world writeable */
2283 trusted_config = FALSE;
2288 /* Well, the trust list at least is up to scratch... */
2289 void *reset_point = store_get(0);
2290 uschar *trusted_configs[32];
2294 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2296 uschar *start = big_buffer, *nl;
2297 while (*start && isspace(*start))
2301 nl = Ustrchr(start, '\n');
2304 trusted_configs[nr_configs++] = string_copy(start);
2305 if (nr_configs == 32)
2313 uschar *list = argrest;
2315 while (trusted_config && (filename = string_nextinlist(&list,
2316 &sep, big_buffer, big_buffer_size)) != NULL)
2318 for (i=0; i < nr_configs; i++)
2320 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2323 if (i == nr_configs)
2325 trusted_config = FALSE;
2329 store_reset(reset_point);
2333 /* No valid prefixes found in trust_list file. */
2334 trusted_config = FALSE;
2340 /* Could not open trust_list file. */
2341 trusted_config = FALSE;
2345 /* Not root; don't trust config */
2346 trusted_config = FALSE;
2350 config_main_filelist = argrest;
2351 config_changed = TRUE;
2356 /* -D: set up a macro definition */
2359 #ifdef DISABLE_D_OPTION
2360 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2365 macro_item *mlast = NULL;
2368 uschar *s = argrest;
2370 while (isspace(*s)) s++;
2372 if (*s < 'A' || *s > 'Z')
2374 fprintf(stderr, "exim: macro name set by -D must start with "
2375 "an upper case letter\n");
2379 while (isalnum(*s) || *s == '_')
2381 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2385 if (ptr == 0) { badarg = TRUE; break; }
2386 while (isspace(*s)) s++;
2389 if (*s++ != '=') { badarg = TRUE; break; }
2390 while (isspace(*s)) s++;
2393 for (m = macros; m != NULL; m = m->next)
2395 if (Ustrcmp(m->name, name) == 0)
2397 fprintf(stderr, "exim: duplicated -D in command line\n");
2403 m = store_get(sizeof(macro_item) + Ustrlen(name));
2405 m->command_line = TRUE;
2406 if (mlast == NULL) macros = m; else mlast->next = m;
2407 Ustrcpy(m->name, name);
2408 m->replacement = string_copy(s);
2410 if (clmacro_count >= MAX_CLMACROS)
2412 fprintf(stderr, "exim: too many -D options on command line\n");
2415 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2421 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2422 The latter is now a no-op, retained for compatibility only. If -dd is used,
2423 debugging subprocesses of the daemon is disabled. */
2426 if (Ustrcmp(argrest, "ropcr") == 0)
2428 /* drop_cr = TRUE; */
2431 /* Use an intermediate variable so that we don't set debugging while
2432 decoding the debugging bits. */
2436 unsigned int selector = D_default;
2439 if (*argrest == 'd')
2441 debug_daemon = TRUE;
2445 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2446 debug_options_count, US"debug", 0);
2447 debug_selector = selector;
2452 /* -E: This is a local error message. This option is not intended for
2453 external use at all, but is not restricted to trusted callers because it
2454 does no harm (just suppresses certain error messages) and if Exim is run
2455 not setuid root it won't always be trusted when it generates error
2456 messages using this option. If there is a message id following -E, point
2457 message_reference at it, for logging. */
2460 local_error_message = TRUE;
2461 if (mac_ismsgid(argrest)) message_reference = argrest;
2465 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2466 option, so it looks as if historically the -oex options are also callable
2467 without the leading -o. So we have to accept them. Before the switch,
2468 anything starting -oe has been converted to -e. Exim does not support all
2469 of the sendmail error options. */
2472 if (Ustrcmp(argrest, "e") == 0)
2474 arg_error_handling = ERRORS_SENDER;
2475 errors_sender_rc = EXIT_SUCCESS;
2477 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2478 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2479 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2480 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2485 /* -F: Set sender's full name, used instead of the gecos entry from
2486 the password file. Since users can usually alter their gecos entries,
2487 there's no security involved in using this instead. The data can follow
2488 the -F or be in the next argument. */
2493 if(++i < argc) argrest = argv[i]; else
2494 { badarg = TRUE; break; }
2496 originator_name = argrest;
2497 sender_name_forced = TRUE;
2501 /* -f: Set sender's address - this value is only actually used if Exim is
2502 run by a trusted user, or if untrusted_set_sender is set and matches the
2503 address, except that the null address can always be set by any user. The
2504 test for this happens later, when the value given here is ignored when not
2505 permitted. For an untrusted user, the actual sender is still put in Sender:
2506 if it doesn't match the From: header (unless no_local_from_check is set).
2507 The data can follow the -f or be in the next argument. The -r switch is an
2508 obsolete form of -f but since there appear to be programs out there that
2509 use anything that sendmail has ever supported, better accept it - the
2510 synonymizing is done before the switch above.
2512 At this stage, we must allow domain literal addresses, because we don't
2513 know what the setting of allow_domain_literals is yet. Ditto for trailing
2514 dots and strip_trailing_dot. */
2522 if (i+1 < argc) argrest = argv[++i]; else
2523 { badarg = TRUE; break; }
2527 sender_address = string_sprintf(""); /* Ensure writeable memory */
2531 uschar *temp = argrest + Ustrlen(argrest) - 1;
2532 while (temp >= argrest && isspace(*temp)) temp--;
2533 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2534 allow_domain_literals = TRUE;
2535 strip_trailing_dot = TRUE;
2536 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2537 &sender_address_domain, TRUE);
2538 allow_domain_literals = FALSE;
2539 strip_trailing_dot = FALSE;
2540 if (sender_address == NULL)
2542 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2543 return EXIT_FAILURE;
2546 sender_address_forced = TRUE;
2550 /* -G: sendmail invocation to specify that it's a gateway submission and
2551 sendmail may complain about problems instead of fixing them.
2552 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2553 not at this time complain about problems. */
2559 /* -h: Set the hop count for an incoming message. Exim does not currently
2560 support this; it always computes it by counting the Received: headers.
2561 To put it in will require a change to the spool header file format. */
2566 if(++i < argc) argrest = argv[i]; else
2567 { badarg = TRUE; break; }
2569 if (!isdigit(*argrest)) badarg = TRUE;
2573 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2574 not to be documented for sendmail but mailx (at least) uses it) */
2577 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2581 /* -L: set the identifier used for syslog; equivalent to setting
2582 syslog_processname in the config file, but needs to be an admin option. */
2585 if (*argrest == '\0')
2587 if(++i < argc) argrest = argv[i]; else
2588 { badarg = TRUE; break; }
2590 sz = Ustrlen(argrest);
2593 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2594 return EXIT_FAILURE;
2598 fprintf(stderr, "exim: the -L syslog name is too short\n");
2599 return EXIT_FAILURE;
2601 cmdline_syslog_name = argrest;
2605 receiving_message = FALSE;
2607 /* -MC: continue delivery of another message via an existing open
2608 file descriptor. This option is used for an internal call by the
2609 smtp transport when there is a pending message waiting to go to an
2610 address to which it has got a connection. Five subsequent arguments are
2611 required: transport name, host name, IP address, sequence number, and
2612 message_id. Transports may decline to create new processes if the sequence
2613 number gets too big. The channel is stdin. This (-MC) must be the last
2614 argument. There's a subsequent check that the real-uid is privileged.
2616 If we are running in the test harness. delay for a bit, to let the process
2617 that set this one up complete. This makes for repeatability of the logging,
2620 if (Ustrcmp(argrest, "C") == 0)
2622 union sockaddr_46 interface_sock;
2623 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2627 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2628 return EXIT_FAILURE;
2631 if (msg_action_arg >= 0)
2633 fprintf(stderr, "exim: incompatible arguments\n");
2634 return EXIT_FAILURE;
2637 continue_transport = argv[++i];
2638 continue_hostname = argv[++i];
2639 continue_host_address = argv[++i];
2640 continue_sequence = Uatoi(argv[++i]);
2641 msg_action = MSG_DELIVER;
2642 msg_action_arg = ++i;
2643 forced_delivery = TRUE;
2644 queue_run_pid = passed_qr_pid;
2645 queue_run_pipe = passed_qr_pipe;
2647 if (!mac_ismsgid(argv[i]))
2649 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2651 return EXIT_FAILURE;
2654 /* Set up $sending_ip_address and $sending_port */
2656 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2658 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2662 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2664 return EXIT_FAILURE;
2667 if (running_in_test_harness) millisleep(500);
2671 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2672 precedes -MC (see above). The flag indicates that the host to which
2673 Exim is connected has accepted an AUTH sequence. */
2675 else if (Ustrcmp(argrest, "CA") == 0)
2677 smtp_authenticated = TRUE;
2681 #ifdef EXPERIMENTAL_DSN
2682 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2683 that exim is connected to supports the esmtp extension DSN */
2684 else if (Ustrcmp(argrest, "CD") == 0)
2686 smtp_use_dsn = TRUE;
2691 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2692 it preceded -MC (see above) */
2694 else if (Ustrcmp(argrest, "CP") == 0)
2696 smtp_use_pipelining = TRUE;
2700 /* -MCQ: pass on the pid of the queue-running process that started
2701 this chain of deliveries and the fd of its synchronizing pipe; this
2702 is useful only when it precedes -MC (see above) */
2704 else if (Ustrcmp(argrest, "CQ") == 0)
2706 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2708 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2713 /* -MCS: set the smtp_use_size flag; this is useful only when it
2714 precedes -MC (see above) */
2716 else if (Ustrcmp(argrest, "CS") == 0)
2718 smtp_use_size = TRUE;
2722 /* -MCT: set the tls_offered flag; this is useful only when it
2723 precedes -MC (see above). The flag indicates that the host to which
2724 Exim is connected has offered TLS support. */
2727 else if (Ustrcmp(argrest, "CT") == 0)
2734 /* -M[x]: various operations on the following list of message ids:
2735 -M deliver the messages, ignoring next retry times and thawing
2736 -Mc deliver the messages, checking next retry times, no thawing
2737 -Mf freeze the messages
2738 -Mg give up on the messages
2739 -Mt thaw the messages
2740 -Mrm remove the messages
2741 In the above cases, this must be the last option. There are also the
2742 following options which are followed by a single message id, and which
2743 act on that message. Some of them use the "recipient" addresses as well.
2744 -Mar add recipient(s)
2745 -Mmad mark all recipients delivered
2746 -Mmd mark recipients(s) delivered
2748 -Mset load a message for use with -be
2750 -Mvc show copy (of whole message, in RFC 2822 format)
2755 else if (*argrest == 0)
2757 msg_action = MSG_DELIVER;
2758 forced_delivery = deliver_force_thaw = TRUE;
2760 else if (Ustrcmp(argrest, "ar") == 0)
2762 msg_action = MSG_ADD_RECIPIENT;
2763 one_msg_action = TRUE;
2765 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2766 else if (Ustrcmp(argrest, "es") == 0)
2768 msg_action = MSG_EDIT_SENDER;
2769 one_msg_action = TRUE;
2771 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2772 else if (Ustrcmp(argrest, "g") == 0)
2774 msg_action = MSG_DELIVER;
2775 deliver_give_up = TRUE;
2777 else if (Ustrcmp(argrest, "mad") == 0)
2779 msg_action = MSG_MARK_ALL_DELIVERED;
2781 else if (Ustrcmp(argrest, "md") == 0)
2783 msg_action = MSG_MARK_DELIVERED;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2787 else if (Ustrcmp(argrest, "set") == 0)
2789 msg_action = MSG_LOAD;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2793 else if (Ustrcmp(argrest, "vb") == 0)
2795 msg_action = MSG_SHOW_BODY;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "vc") == 0)
2800 msg_action = MSG_SHOW_COPY;
2801 one_msg_action = TRUE;
2803 else if (Ustrcmp(argrest, "vh") == 0)
2805 msg_action = MSG_SHOW_HEADER;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "vl") == 0)
2810 msg_action = MSG_SHOW_LOG;
2811 one_msg_action = TRUE;
2813 else { badarg = TRUE; break; }
2815 /* All the -Mxx options require at least one message id. */
2817 msg_action_arg = i + 1;
2818 if (msg_action_arg >= argc)
2820 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2821 return EXIT_FAILURE;
2824 /* Some require only message ids to follow */
2826 if (!one_msg_action)
2829 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2831 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2833 return EXIT_FAILURE;
2835 goto END_ARG; /* Remaining args are ids */
2838 /* Others require only one message id, possibly followed by addresses,
2839 which will be handled as normal arguments. */
2843 if (!mac_ismsgid(argv[msg_action_arg]))
2845 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2846 argv[msg_action_arg], arg);
2847 return EXIT_FAILURE;
2854 /* Some programs seem to call the -om option without the leading o;
2855 for sendmail it askes for "me too". Exim always does this. */
2858 if (*argrest != 0) badarg = TRUE;
2862 /* -N: don't do delivery - a debugging option that stops transports doing
2863 their thing. It implies debugging at the D_v level. */
2868 dont_deliver = TRUE;
2869 debug_selector |= D_v;
2870 debug_file = stderr;
2876 /* -n: This means "don't alias" in sendmail, apparently.
2877 For normal invocations, it has no effect.
2878 It may affect some other options. */
2884 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2885 option to the specified value. This form uses long names. We need to handle
2886 -O option=value and -Ooption=value. */
2893 fprintf(stderr, "exim: string expected after -O\n");
2901 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2904 if (*argrest == 'A')
2906 alias_arg = argrest + 1;
2907 if (alias_arg[0] == 0)
2909 if (i+1 < argc) alias_arg = argv[++i]; else
2911 fprintf(stderr, "exim: string expected after -oA\n");
2917 /* -oB: Set a connection message max value for remote deliveries */
2919 else if (*argrest == 'B')
2921 uschar *p = argrest + 1;
2924 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2926 connection_max_messages = 1;
2935 fprintf(stderr, "exim: number expected after -oB\n");
2938 connection_max_messages = Uatoi(p);
2942 /* -odb: background delivery */
2944 else if (Ustrcmp(argrest, "db") == 0)
2946 synchronous_delivery = FALSE;
2947 arg_queue_only = FALSE;
2948 queue_only_set = TRUE;
2951 /* -odf: foreground delivery (smail-compatible option); same effect as
2952 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2955 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2957 synchronous_delivery = TRUE;
2958 arg_queue_only = FALSE;
2959 queue_only_set = TRUE;
2962 /* -odq: queue only */
2964 else if (Ustrcmp(argrest, "dq") == 0)
2966 synchronous_delivery = FALSE;
2967 arg_queue_only = TRUE;
2968 queue_only_set = TRUE;
2971 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2972 but no remote delivery */
2974 else if (Ustrcmp(argrest, "dqs") == 0)
2977 arg_queue_only = FALSE;
2978 queue_only_set = TRUE;
2981 /* -oex: Sendmail error flags. As these are also accepted without the
2982 leading -o prefix, for compatibility with vacation and other callers,
2983 they are handled with -e above. */
2985 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2986 -oitrue: Another sendmail syntax for the same */
2988 else if (Ustrcmp(argrest, "i") == 0 ||
2989 Ustrcmp(argrest, "itrue") == 0)
2992 /* -oM*: Set various characteristics for an incoming message; actually
2993 acted on for trusted callers only. */
2995 else if (*argrest == 'M')
2999 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3003 /* -oMa: Set sender host address */
3005 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3007 /* -oMaa: Set authenticator name */
3009 else if (Ustrcmp(argrest, "Maa") == 0)
3010 sender_host_authenticated = argv[++i];
3012 /* -oMas: setting authenticated sender */
3014 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3016 /* -oMai: setting authenticated id */
3018 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3020 /* -oMi: Set incoming interface address */
3022 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3024 /* -oMm: Message reference */
3026 else if (Ustrcmp(argrest, "Mm") == 0)
3028 if (!mac_ismsgid(argv[i+1]))
3030 fprintf(stderr,"-oMm must be a valid message ID\n");
3033 if (!trusted_config)
3035 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3038 message_reference = argv[++i];
3041 /* -oMr: Received protocol */
3043 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3045 /* -oMs: Set sender host name */
3047 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3049 /* -oMt: Set sender ident */
3051 else if (Ustrcmp(argrest, "Mt") == 0)
3053 sender_ident_set = TRUE;
3054 sender_ident = argv[++i];
3057 /* Else a bad argument */
3066 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3067 seem to call this as -m (undocumented), so that is also accepted (see
3070 else if (Ustrcmp(argrest, "m") == 0) {}
3072 /* -oo: An ancient flag for old-style addresses which still seems to
3073 crop up in some calls (see in SCO). */
3075 else if (Ustrcmp(argrest, "o") == 0) {}
3077 /* -oP <name>: set pid file path for daemon */
3079 else if (Ustrcmp(argrest, "P") == 0)
3080 override_pid_file_path = argv[++i];
3082 /* -or <n>: set timeout for non-SMTP acceptance
3083 -os <n>: set timeout for SMTP acceptance */
3085 else if (*argrest == 'r' || *argrest == 's')
3087 int *tp = (*argrest == 'r')?
3088 &arg_receive_timeout : &arg_smtp_receive_timeout;
3089 if (argrest[1] == 0)
3091 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3093 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3096 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3101 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3103 else if (Ustrcmp(argrest, "X") == 0)
3104 override_local_interfaces = argv[++i];
3106 /* Unknown -o argument */
3112 /* -ps: force Perl startup; -pd force delayed Perl startup */
3116 if (*argrest == 's' && argrest[1] == 0)
3118 perl_start_option = 1;
3121 if (*argrest == 'd' && argrest[1] == 0)
3123 perl_start_option = -1;
3128 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3129 which sets the host protocol and host name */
3133 if (i+1 < argc) argrest = argv[++i]; else
3134 { badarg = TRUE; break; }
3139 uschar *hn = Ustrchr(argrest, ':');
3142 received_protocol = argrest;
3146 received_protocol = string_copyn(argrest, hn - argrest);
3147 sender_host_name = hn + 1;
3154 receiving_message = FALSE;
3155 if (queue_interval >= 0)
3157 fprintf(stderr, "exim: -q specified more than once\n");
3161 /* -qq...: Do queue runs in a 2-stage manner */
3163 if (*argrest == 'q')
3165 queue_2stage = TRUE;
3169 /* -qi...: Do only first (initial) deliveries */
3171 if (*argrest == 'i')
3173 queue_run_first_delivery = TRUE;
3177 /* -qf...: Run the queue, forcing deliveries
3178 -qff..: Ditto, forcing thawing as well */
3180 if (*argrest == 'f')
3182 queue_run_force = TRUE;
3183 if (*(++argrest) == 'f')
3185 deliver_force_thaw = TRUE;
3190 /* -q[f][f]l...: Run the queue only on local deliveries */
3192 if (*argrest == 'l')
3194 queue_run_local = TRUE;
3198 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3199 optionally starting from a given message id. */
3201 if (*argrest == 0 &&
3202 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3205 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3206 start_queue_run_id = argv[++i];
3207 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3208 stop_queue_run_id = argv[++i];
3211 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3212 optionally local only. */
3217 queue_interval = readconf_readtime(argrest, 0, FALSE);
3219 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3220 if (queue_interval <= 0)
3222 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3229 case 'R': /* Synonymous with -qR... */
3230 receiving_message = FALSE;
3232 /* -Rf: As -R (below) but force all deliveries,
3233 -Rff: Ditto, but also thaw all frozen messages,
3234 -Rr: String is regex
3235 -Rrf: Regex and force
3236 -Rrff: Regex and force and thaw
3238 in all cases provided there are no further characters in this
3244 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3246 if (Ustrcmp(argrest, rsopts[i]) == 0)
3248 if (i != 2) queue_run_force = TRUE;
3249 if (i >= 2) deliver_selectstring_regex = TRUE;
3250 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3251 argrest += Ustrlen(rsopts[i]);
3256 /* -R: Set string to match in addresses for forced queue run to
3257 pick out particular messages. */
3261 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3263 fprintf(stderr, "exim: string expected after -R\n");
3267 else deliver_selectstring = argrest;
3271 /* -r: an obsolete synonym for -f (see above) */
3274 /* -S: Like -R but works on sender. */
3276 case 'S': /* Synonymous with -qS... */
3277 receiving_message = FALSE;
3279 /* -Sf: As -S (below) but force all deliveries,
3280 -Sff: Ditto, but also thaw all frozen messages,
3281 -Sr: String is regex
3282 -Srf: Regex and force
3283 -Srff: Regex and force and thaw
3285 in all cases provided there are no further characters in this
3291 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3293 if (Ustrcmp(argrest, rsopts[i]) == 0)
3295 if (i != 2) queue_run_force = TRUE;
3296 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3297 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3298 argrest += Ustrlen(rsopts[i]);
3303 /* -S: Set string to match in addresses for forced queue run to
3304 pick out particular messages. */
3308 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3310 fprintf(stderr, "exim: string expected after -S\n");
3314 else deliver_selectstring_sender = argrest;
3317 /* -Tqt is an option that is exclusively for use by the testing suite.
3318 It is not recognized in other circumstances. It allows for the setting up
3319 of explicit "queue times" so that various warning/retry things can be
3320 tested. Otherwise variability of clock ticks etc. cause problems. */
3323 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3324 fudged_queue_times = argv[++i];
3329 /* -t: Set flag to extract recipients from body of message. */
3332 if (*argrest == 0) extract_recipients = TRUE;
3334 /* -ti: Set flag to extract recipients from body of message, and also
3335 specify that dot does not end the message. */
3337 else if (Ustrcmp(argrest, "i") == 0)
3339 extract_recipients = TRUE;
3343 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3346 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3353 /* -U: This means "initial user submission" in sendmail, apparently. The
3354 doc claims that in future sendmail may refuse syntactically invalid
3355 messages instead of fixing them. For the moment, we just ignore it. */
3361 /* -v: verify things - this is a very low-level debugging */
3366 debug_selector |= D_v;
3367 debug_file = stderr;
3373 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3375 The -x flag tells the sendmail command that mail from a local
3376 mail program has National Language Support (NLS) extended characters
3377 in the body of the mail item. The sendmail command can send mail with
3378 extended NLS characters across networks that normally corrupts these
3381 As Exim is 8-bit clean, it just ignores this flag. */
3384 if (*argrest != 0) badarg = TRUE;
3387 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3388 logs to that file. We swallow the parameter and otherwise ignore it. */
3391 if (*argrest == '\0')
3395 fprintf(stderr, "exim: string expected after -X\n");
3401 /* All other initial characters are errors */
3406 } /* End of high-level switch statement */
3408 /* Failed to recognize the option, or syntax error */
3412 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3413 "option %s\n", arg);
3419 /* If -R or -S have been specified without -q, assume a single queue run. */
3421 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3422 queue_interval < 0) queue_interval = 0;
3426 /* If usage_wanted is set we call the usage function - which never returns */
3427 if (usage_wanted) exim_usage(called_as);
3429 /* Arguments have been processed. Check for incompatibilities. */
3431 (smtp_input || extract_recipients || recipients_arg < argc) &&
3432 (daemon_listen || queue_interval >= 0 || bi_option ||
3433 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3434 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3437 msg_action_arg > 0 &&
3438 (daemon_listen || queue_interval >= 0 || list_options ||
3439 (checking && msg_action != MSG_LOAD) ||
3440 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3443 (daemon_listen || queue_interval >= 0) &&
3444 (sender_address != NULL || list_options || list_queue || checking ||
3448 daemon_listen && queue_interval == 0
3451 inetd_wait_mode && queue_interval >= 0
3455 (checking || smtp_input || extract_recipients ||
3456 filter_test != FTEST_NONE || bi_option)
3459 verify_address_mode &&
3460 (address_test_mode || smtp_input || extract_recipients ||
3461 filter_test != FTEST_NONE || bi_option)
3464 address_test_mode && (smtp_input || extract_recipients ||
3465 filter_test != FTEST_NONE || bi_option)
3468 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3472 deliver_selectstring != NULL && queue_interval < 0
3475 msg_action == MSG_LOAD &&
3476 (!expansion_test || expansion_test_message != NULL)
3480 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3484 /* If debugging is set up, set the file and the file descriptor to pass on to
3485 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3486 to run in the foreground. */
3488 if (debug_selector != 0)
3490 debug_file = stderr;
3491 debug_fd = fileno(debug_file);
3492 background_daemon = FALSE;
3493 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3494 if (debug_selector != D_v) /* -v only doesn't show this */
3496 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3497 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3499 if (!version_printed)
3500 show_whats_supported(stderr);
3504 /* When started with root privilege, ensure that the limits on the number of
3505 open files and the number of processes (where that is accessible) are
3506 sufficiently large, or are unset, in case Exim has been called from an
3507 environment where the limits are screwed down. Not all OS have the ability to
3508 change some of these limits. */
3512 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3518 #ifdef RLIMIT_NOFILE
3519 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3521 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3523 rlp.rlim_cur = rlp.rlim_max = 0;
3526 /* I originally chose 1000 as a nice big number that was unlikely to
3527 be exceeded. It turns out that some older OS have a fixed upper limit of
3530 if (rlp.rlim_cur < 1000)
3532 rlp.rlim_cur = rlp.rlim_max = 1000;
3533 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3535 rlp.rlim_cur = rlp.rlim_max = 256;
3536 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3537 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3544 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3546 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3548 rlp.rlim_cur = rlp.rlim_max = 0;
3551 #ifdef RLIM_INFINITY
3552 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3554 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3556 if (rlp.rlim_cur < 1000)
3558 rlp.rlim_cur = rlp.rlim_max = 1000;
3560 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3561 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3567 /* Exim is normally entered as root (but some special configurations are
3568 possible that don't do this). However, it always spins off sub-processes that
3569 set their uid and gid as required for local delivery. We don't want to pass on
3570 any extra groups that root may belong to, so we want to get rid of them all at
3573 We need to obey setgroups() at this stage, before possibly giving up root
3574 privilege for a changed configuration file, but later on we might need to
3575 check on the additional groups for the admin user privilege - can't do that
3576 till after reading the config, which might specify the exim gid. Therefore,
3577 save the group list here first. */
3579 group_count = getgroups(NGROUPS_MAX, group_list);
3580 if (group_count < 0)
3582 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3586 /* There is a fundamental difference in some BSD systems in the matter of
3587 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3588 known not to be different. On the "different" systems there is a single group
3589 list, and the first entry in it is the current group. On all other versions of
3590 Unix there is a supplementary group list, which is in *addition* to the current
3591 group. Consequently, to get rid of all extraneous groups on a "standard" system
3592 you pass over 0 groups to setgroups(), while on a "different" system you pass
3593 over a single group - the current group, which is always the first group in the
3594 list. Calling setgroups() with zero groups on a "different" system results in
3595 an error return. The following code should cope with both types of system.
3597 However, if this process isn't running as root, setgroups() can't be used
3598 since you have to be root to run it, even if throwing away groups. Not being
3599 root here happens only in some unusual configurations. We just ignore the
3602 if (setgroups(0, NULL) != 0)
3604 if (setgroups(1, group_list) != 0 && !unprivileged)
3606 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3611 /* If the configuration file name has been altered by an argument on the
3612 command line (either a new file name or a macro definition) and the caller is
3613 not root, or if this is a filter testing run, remove any setuid privilege the
3614 program has and run as the underlying user.
3616 The exim user is locked out of this, which severely restricts the use of -C
3619 Otherwise, set the real ids to the effective values (should be root unless run
3620 from inetd, which it can either be root or the exim uid, if one is configured).
3622 There is a private mechanism for bypassing some of this, in order to make it
3623 possible to test lots of configurations automatically, without having either to
3624 recompile each time, or to patch in an actual configuration file name and other
3625 values (such as the path name). If running in the test harness, pretend that
3626 configuration file changes and macro definitions haven't happened. */
3629 (!trusted_config || /* Config changed, or */
3630 !macros_trusted()) && /* impermissible macros and */
3631 real_uid != root_uid && /* Not root, and */
3632 !running_in_test_harness /* Not fudged */
3634 expansion_test /* expansion testing */
3636 filter_test != FTEST_NONE) /* Filter testing */
3638 setgroups(group_count, group_list);
3639 exim_setugid(real_uid, real_gid, FALSE,
3640 US"-C, -D, -be or -bf forces real uid");
3641 removed_privilege = TRUE;
3643 /* In the normal case when Exim is called like this, stderr is available
3644 and should be used for any logging information because attempts to write
3645 to the log will usually fail. To arrange this, we unset really_exim. However,
3646 if no stderr is available there is no point - we might as well have a go
3647 at the log (if it fails, syslog will be written).
3649 Note that if the invoker is Exim, the logs remain available. Messing with
3650 this causes unlogged successful deliveries. */
3652 if ((log_stderr != NULL) && (real_uid != exim_uid))
3653 really_exim = FALSE;
3656 /* Privilege is to be retained for the moment. It may be dropped later,
3657 depending on the job that this Exim process has been asked to do. For now, set
3658 the real uid to the effective so that subsequent re-execs of Exim are done by a
3661 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3663 /* If testing a filter, open the file(s) now, before wasting time doing other
3664 setups and reading the message. */
3666 if ((filter_test & FTEST_SYSTEM) != 0)
3668 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3671 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3673 return EXIT_FAILURE;
3677 if ((filter_test & FTEST_USER) != 0)
3679 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3682 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3684 return EXIT_FAILURE;
3688 /* Initialise lookup_list
3689 If debugging, already called above via version reporting.
3690 In either case, we initialise the list of available lookups while running
3691 as root. All dynamically modules are loaded from a directory which is
3692 hard-coded into the binary and is code which, if not a module, would be
3693 part of Exim already. Ability to modify the content of the directory
3694 is equivalent to the ability to modify a setuid binary!
3696 This needs to happen before we read the main configuration. */
3699 /* Read the main runtime configuration data; this gives up if there
3700 is a failure. It leaves the configuration file open so that the subsequent
3701 configuration data for delivery can be read if needed. */
3705 /* If an action on specific messages is requested, or if a daemon or queue
3706 runner is being started, we need to know if Exim was called by an admin user.
3707 This is the case if the real user is root or exim, or if the real group is
3708 exim, or if one of the supplementary groups is exim or a group listed in
3709 admin_groups. We don't fail all message actions immediately if not admin_user,
3710 since some actions can be performed by non-admin users. Instead, set admin_user
3711 for later interrogation. */
3713 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3718 for (i = 0; i < group_count; i++)
3720 if (group_list[i] == exim_gid) admin_user = TRUE;
3721 else if (admin_groups != NULL)
3723 for (j = 1; j <= (int)(admin_groups[0]); j++)
3724 if (admin_groups[j] == group_list[i])
3725 { admin_user = TRUE; break; }
3727 if (admin_user) break;
3731 /* Another group of privileged users are the trusted users. These are root,
3732 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3733 are permitted to specify sender_addresses with -f on the command line, and
3734 other message parameters as well. */
3736 if (real_uid == root_uid || real_uid == exim_uid)
3737 trusted_caller = TRUE;
3742 if (trusted_users != NULL)
3744 for (i = 1; i <= (int)(trusted_users[0]); i++)
3745 if (trusted_users[i] == real_uid)
3746 { trusted_caller = TRUE; break; }
3749 if (!trusted_caller && trusted_groups != NULL)
3751 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3753 if (trusted_groups[i] == real_gid)
3754 trusted_caller = TRUE;
3755 else for (j = 0; j < group_count; j++)
3757 if (trusted_groups[i] == group_list[j])
3758 { trusted_caller = TRUE; break; }
3760 if (trusted_caller) break;
3765 /* Handle the decoding of logging options. */
3767 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3768 log_selector_string, log_options, log_options_count, US"log", 0);
3772 debug_printf("configuration file is %s\n", config_main_filename);
3773 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3774 log_extra_selector);
3777 /* If domain literals are not allowed, check the sender address that was
3778 supplied with -f. Ditto for a stripped trailing dot. */
3780 if (sender_address != NULL)
3782 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3784 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3785 "allowed\n", sender_address);
3786 return EXIT_FAILURE;
3788 if (f_end_dot && !strip_trailing_dot)
3790 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3791 "(trailing dot not allowed)\n", sender_address);
3792 return EXIT_FAILURE;
3796 /* See if an admin user overrode our logging. */
3798 if (cmdline_syslog_name != NULL)
3802 syslog_processname = cmdline_syslog_name;
3803 log_file_path = string_copy(CUS"syslog");
3807 /* not a panic, non-privileged users should not be able to spam paniclog */
3809 "exim: you lack sufficient privilege to specify syslog process name\n");
3810 return EXIT_FAILURE;
3814 /* Paranoia check of maximum lengths of certain strings. There is a check
3815 on the length of the log file path in log.c, which will come into effect
3816 if there are any calls to write the log earlier than this. However, if we
3817 get this far but the string is very long, it is better to stop now than to
3818 carry on and (e.g.) receive a message and then have to collapse. The call to
3819 log_write() from here will cause the ultimate panic collapse if the complete
3820 file name exceeds the buffer length. */
3822 if (Ustrlen(log_file_path) > 200)
3823 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3824 "log_file_path is longer than 200 chars: aborting");
3826 if (Ustrlen(pid_file_path) > 200)
3827 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3828 "pid_file_path is longer than 200 chars: aborting");
3830 if (Ustrlen(spool_directory) > 200)
3831 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3832 "spool_directory is longer than 200 chars: aborting");
3834 /* Length check on the process name given to syslog for its TAG field,
3835 which is only permitted to be 32 characters or less. See RFC 3164. */
3837 if (Ustrlen(syslog_processname) > 32)
3838 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3839 "syslog_processname is longer than 32 chars: aborting");
3841 /* In some operating systems, the environment variable TMPDIR controls where
3842 temporary files are created; Exim doesn't use these (apart from when delivering
3843 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3844 If TMPDIR is found in the environment, reset it to the value defined in the
3845 TMPDIR macro, if this macro is defined. */
3850 for (p = USS environ; *p != NULL; p++)
3852 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3853 Ustrcmp(*p+7, TMPDIR) != 0)
3855 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3856 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3858 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3864 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3865 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3866 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3867 called by a user who has set the TZ variable. This then affects the timestamps
3868 in log files and in Received: headers, and any created Date: header lines. The
3869 required timezone is settable in the configuration file, so nothing can be done
3870 about this earlier - but hopefully nothing will normally be logged earlier than
3871 this. We have to make a new environment if TZ is wrong, but don't bother if
3872 timestamps_utc is set, because then all times are in UTC anyway. */
3874 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3876 timestamps_utc = TRUE;
3880 uschar *envtz = US getenv("TZ");
3881 if ((envtz == NULL && timezone_string != NULL) ||
3883 (timezone_string == NULL ||
3884 Ustrcmp(timezone_string, envtz) != 0)))
3886 uschar **p = USS environ;
3890 while (*p++ != NULL) count++;
3891 if (envtz == NULL) count++;
3892 newp = new = malloc(sizeof(uschar *) * (count + 1));
3893 for (p = USS environ; *p != NULL; p++)
3895 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3898 if (timezone_string != NULL)
3900 *newp = malloc(Ustrlen(timezone_string) + 4);
3901 sprintf(CS *newp++, "TZ=%s", timezone_string);
3906 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3907 tod_stamp(tod_log));
3911 /* Handle the case when we have removed the setuid privilege because of -C or
3912 -D. This means that the caller of Exim was not root.
3914 There is a problem if we were running as the Exim user. The sysadmin may
3915 expect this case to retain privilege because "the binary was called by the
3916 Exim user", but it hasn't, because either the -D option set macros, or the
3917 -C option set a non-trusted configuration file. There are two possibilities:
3919 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3920 to do message deliveries. Thus, the fact that it is running as a
3921 non-privileged user is plausible, and might be wanted in some special
3922 configurations. However, really_exim will have been set false when
3923 privilege was dropped, to stop Exim trying to write to its normal log
3924 files. Therefore, re-enable normal log processing, assuming the sysadmin
3925 has set up the log directory correctly.
3927 (2) If deliver_drop_privilege is not set, the configuration won't work as
3928 apparently intended, and so we log a panic message. In order to retain
3929 root for -C or -D, the caller must either be root or be invoking a
3930 trusted configuration file (when deliver_drop_privilege is false). */
3932 if (removed_privilege && (!trusted_config || macros != NULL) &&
3933 real_uid == exim_uid)
3935 if (deliver_drop_privilege)
3936 really_exim = TRUE; /* let logging work normally */
3938 log_write(0, LOG_MAIN|LOG_PANIC,
3939 "exim user lost privilege for using %s option",
3940 trusted_config? "-D" : "-C");
3943 /* Start up Perl interpreter if Perl support is configured and there is a
3944 perl_startup option, and the configuration or the command line specifies
3945 initializing starting. Note that the global variables are actually called
3946 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3949 if (perl_start_option != 0)
3950 opt_perl_at_start = (perl_start_option > 0);
3951 if (opt_perl_at_start && opt_perl_startup != NULL)
3954 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3955 errstr = init_perl(opt_perl_startup);
3958 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3959 return EXIT_FAILURE;
3961 opt_perl_started = TRUE;
3963 #endif /* EXIM_PERL */
3965 /* Log the arguments of the call if the configuration file said so. This is
3966 a debugging feature for finding out what arguments certain MUAs actually use.
3967 Don't attempt it if logging is disabled, or if listing variables or if
3968 verifying/testing addresses or expansions. */
3970 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3971 && really_exim && !list_options && !checking)
3974 uschar *p = big_buffer;
3976 Ustrcpy(p, "cwd= (failed)");
3977 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3979 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3981 for (i = 0; i < argc; i++)
3983 int len = Ustrlen(argv[i]);
3986 if (p + len + 8 >= big_buffer + big_buffer_size)
3989 log_write(0, LOG_MAIN, "%s", big_buffer);
3990 Ustrcpy(big_buffer, "...");
3993 printing = string_printing(argv[i]);
3994 if (printing[0] == 0) quote = US"\""; else
3996 uschar *pp = printing;
3998 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4000 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4001 (p - big_buffer) - 4), printing, quote);
4005 if ((log_extra_selector & LX_arguments) != 0)
4006 log_write(0, LOG_MAIN, "%s", big_buffer);
4008 debug_printf("%s\n", big_buffer);
4011 /* Set the working directory to be the top-level spool directory. We don't rely
4012 on this in the code, which always uses fully qualified names, but it's useful
4013 for core dumps etc. Don't complain if it fails - the spool directory might not
4014 be generally accessible and calls with the -C option (and others) have lost
4015 privilege by now. Before the chdir, we try to ensure that the directory exists.
4018 if (Uchdir(spool_directory) != 0)
4021 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4022 dummy = /* quieten compiler */ Uchdir(spool_directory);
4025 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4026 alias file. Exim doesn't have such a concept, but this call is screwed into
4027 Sun's YP makefiles. Handle this by calling a configured script, as the real
4028 user who called Exim. The -oA option can be used to pass an argument to the
4033 (void)fclose(config_file);
4034 if (bi_command != NULL)
4038 argv[i++] = bi_command;
4039 if (alias_arg != NULL) argv[i++] = alias_arg;
4042 setgroups(group_count, group_list);
4043 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4045 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4046 (argv[1] == NULL)? US"" : argv[1]);
4048 execv(CS argv[0], (char *const *)argv);
4049 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4054 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4059 /* We moved the admin/trusted check to be immediately after reading the
4060 configuration file. We leave these prints here to ensure that syslog setup,
4061 logfile setup, and so on has already happened. */
4063 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4064 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4066 /* Only an admin user may start the daemon or force a queue run in the default
4067 configuration, but the queue run restriction can be relaxed. Only an admin
4068 user may request that a message be returned to its sender forthwith. Only an
4069 admin user may specify a debug level greater than D_v (because it might show
4070 passwords, etc. in lookup queries). Only an admin user may request a queue
4071 count. Only an admin user can use the test interface to scan for email
4072 (because Exim will be in the spool dir and able to look at mails). */
4076 BOOL debugset = (debug_selector & ~D_v) != 0;
4077 if (deliver_give_up || daemon_listen || malware_test_file ||
4078 (count_queue && queue_list_requires_admin) ||
4079 (list_queue && queue_list_requires_admin) ||
4080 (queue_interval >= 0 && prod_requires_admin) ||
4081 (debugset && !running_in_test_harness))
4083 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4088 /* If the real user is not root or the exim uid, the argument for passing
4089 in an open TCP/IP connection for another message is not permitted, nor is
4090 running with the -N option for any delivery action, unless this call to exim is
4091 one that supplied an input message, or we are using a patched exim for
4092 regression testing. */
4094 if (real_uid != root_uid && real_uid != exim_uid &&
4095 (continue_hostname != NULL ||
4097 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4098 )) && !running_in_test_harness)
4100 fprintf(stderr, "exim: Permission denied\n");
4101 return EXIT_FAILURE;
4104 /* If the caller is not trusted, certain arguments are ignored when running for
4105 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4106 Note that authority for performing certain actions on messages is tested in the
4107 queue_action() function. */
4109 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4111 sender_host_name = sender_host_address = interface_address =
4112 sender_ident = received_protocol = NULL;
4113 sender_host_port = interface_port = 0;
4114 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4117 /* If a sender host address is set, extract the optional port number off the
4118 end of it and check its syntax. Do the same thing for the interface address.
4119 Exim exits if the syntax is bad. */
4123 if (sender_host_address != NULL)
4124 sender_host_port = check_port(sender_host_address);
4125 if (interface_address != NULL)
4126 interface_port = check_port(interface_address);
4129 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4134 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4135 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4139 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4140 return EXIT_FAILURE;
4144 /* If an SMTP message is being received check to see if the standard input is a
4145 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4146 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4151 union sockaddr_46 inetd_sock;
4152 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4153 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4155 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4156 if (family == AF_INET || family == AF_INET6)
4158 union sockaddr_46 interface_sock;
4159 size = sizeof(interface_sock);
4161 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4162 interface_address = host_ntoa(-1, &interface_sock, NULL,
4165 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4167 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4170 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4171 NULL, &sender_host_port);
4172 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4173 "inetd is not supported when mua_wrapper is set");
4178 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4179 return EXIT_FAILURE;
4185 /* If the load average is going to be needed while receiving a message, get it
4186 now for those OS that require the first call to os_getloadavg() to be done as
4187 root. There will be further calls later for each message received. */
4189 #ifdef LOAD_AVG_NEEDS_ROOT
4190 if (receiving_message &&
4191 (queue_only_load >= 0 ||
4192 (is_inetd && smtp_load_reserve >= 0)
4195 load_average = OS_GETLOADAVG();
4199 /* The queue_only configuration option can be overridden by -odx on the command
4200 line, except that if queue_only_override is false, queue_only cannot be unset
4201 from the command line. */
4203 if (queue_only_set && (queue_only_override || arg_queue_only))
4204 queue_only = arg_queue_only;
4206 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4209 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4210 if (arg_smtp_receive_timeout >= 0)
4211 smtp_receive_timeout = arg_smtp_receive_timeout;
4213 /* If Exim was started with root privilege, unless we have already removed the
4214 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4215 except when starting the daemon or doing some kind of delivery or address
4216 testing (-bt). These are the only cases when root need to be retained. We run
4217 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4218 retained only for starting the daemon. We always do the initgroups() in this
4219 situation (controlled by the TRUE below), in order to be as close as possible
4220 to the state Exim usually runs in. */
4222 if (!unprivileged && /* originally had root AND */
4223 !removed_privilege && /* still got root AND */
4224 !daemon_listen && /* not starting the daemon */
4225 queue_interval <= 0 && /* (either kind of daemon) */
4227 deliver_drop_privilege || /* requested unprivileged */
4229 queue_interval < 0 && /* not running the queue */
4230 (msg_action_arg < 0 || /* and */
4231 msg_action != MSG_DELIVER) && /* not delivering and */
4232 (!checking || !address_test_mode) /* not address checking */
4236 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4239 /* When we are retaining a privileged uid, we still change to the exim gid. */
4244 rv = setgid(exim_gid);
4245 /* Impact of failure is that some stuff might end up with an incorrect group.
4246 We track this for failures from root, since any attempt to change privilege
4247 by root should succeed and failures should be examined. For non-root,
4248 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4249 no need to complain then. */
4252 if (!(unprivileged || removed_privilege))
4255 "exim: changing group failed: %s\n", strerror(errno));
4259 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4260 (long int)exim_gid, strerror(errno));
4264 /* Handle a request to scan a file for malware */
4265 if (malware_test_file)
4267 #ifdef WITH_CONTENT_SCAN
4269 set_process_info("scanning file for malware");
4270 result = malware_in_file(malware_test_file);
4273 printf("No malware found.\n");
4278 printf("Malware lookup returned non-okay/fail: %d\n", result);
4282 printf("Malware found: %s\n", malware_name);
4284 printf("Malware scan detected malware of unknown name.\n");
4286 printf("Malware scanning not enabled at compile time.\n");
4291 /* Handle a request to list the delivery queue */
4295 set_process_info("listing the queue");
4296 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4300 /* Handle a request to count the delivery queue */
4304 set_process_info("counting the queue");
4309 /* Handle actions on specific messages, except for the force delivery and
4310 message load actions, which are done below. Some actions take a whole list of
4311 message ids, which are known to continue up to the end of the arguments. Others
4312 take a single message id and then operate on the recipients list. */
4314 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4316 int yield = EXIT_SUCCESS;
4317 set_process_info("acting on specified messages");
4319 if (!one_msg_action)
4321 for (i = msg_action_arg; i < argc; i++)
4322 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4323 yield = EXIT_FAILURE;
4326 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4327 recipients_arg)) yield = EXIT_FAILURE;
4331 /* We used to set up here to skip reading the ACL section, on
4332 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4333 Now, since the intro of the ${acl } expansion, ACL definitions may be
4334 needed in transports so we lost the optimisation. */
4338 /* The configuration data will have been read into POOL_PERM because we won't
4339 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4340 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4341 configuration were read into POOL_MAIN, because we don't do any resets till
4342 later on. However, it seems right, and it does ensure that both pools get used.
4345 store_pool = POOL_MAIN;
4347 /* Handle the -brt option. This is for checking out retry configurations.
4348 The next three arguments are a domain name or a complete address, and
4349 optionally two error numbers. All it does is to call the function that
4350 scans the retry configuration data. */
4352 if (test_retry_arg >= 0)
4354 retry_config *yield;
4355 int basic_errno = 0;
4359 if (test_retry_arg >= argc)
4361 printf("-brt needs a domain or address argument\n");
4362 exim_exit(EXIT_FAILURE);
4364 s1 = argv[test_retry_arg++];
4367 /* If the first argument contains no @ and no . it might be a local user
4368 or it might be a single-component name. Treat as a domain. */
4370 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4372 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4373 "being \ntreated as a one-component domain, not as a local part.\n\n",
4377 /* There may be an optional second domain arg. */
4379 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4380 s2 = argv[test_retry_arg++];
4382 /* The final arg is an error name */
4384 if (test_retry_arg < argc)
4386 uschar *ss = argv[test_retry_arg];
4388 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4391 printf("%s\n", CS error);
4392 return EXIT_FAILURE;
4395 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4396 code > 100 as an error is for matching codes to the decade. Turn them into
4397 a real error code, off the decade. */
4399 if (basic_errno == ERRNO_MAIL4XX ||
4400 basic_errno == ERRNO_RCPT4XX ||
4401 basic_errno == ERRNO_DATA4XX)
4403 int code = (more_errno >> 8) & 255;
4405 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4406 else if (code > 100)
4407 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4411 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4412 if (yield == NULL) printf("No retry information found\n"); else
4415 more_errno = yield->more_errno;
4416 printf("Retry rule: %s ", yield->pattern);
4418 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4420 printf("quota%s%s ",
4421 (more_errno > 0)? "_" : "",
4422 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4424 else if (yield->basic_errno == ECONNREFUSED)
4426 printf("refused%s%s ",
4427 (more_errno > 0)? "_" : "",
4428 (more_errno == 'M')? "MX" :
4429 (more_errno == 'A')? "A" : "");
4431 else if (yield->basic_errno == ETIMEDOUT)
4434 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4436 if (more_errno != 0) printf("_%s",
4437 (more_errno == 'M')? "MX" : "A");
4440 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4441 printf("auth_failed ");
4444 for (r = yield->rules; r != NULL; r = r->next)
4446 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4447 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4453 printf(",%d.", x/1000);
4467 exim_exit(EXIT_SUCCESS);
4470 /* Handle a request to list one or more configuration options */
4471 /* If -n was set, we suppress some information */
4475 set_process_info("listing variables");
4476 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4477 else for (i = recipients_arg; i < argc; i++)
4480 (Ustrcmp(argv[i], "router") == 0 ||
4481 Ustrcmp(argv[i], "transport") == 0 ||
4482 Ustrcmp(argv[i], "authenticator") == 0 ||
4483 Ustrcmp(argv[i], "macro") == 0))
4485 readconf_print(argv[i+1], argv[i], flag_n);
4488 else readconf_print(argv[i], NULL, flag_n);
4490 exim_exit(EXIT_SUCCESS);
4494 /* Handle a request to deliver one or more messages that are already on the
4495 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4496 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4498 Delivery of specific messages is typically used for a small number when
4499 prodding by hand (when the option forced_delivery will be set) or when
4500 re-execing to regain root privilege. Each message delivery must happen in a
4501 separate process, so we fork a process for each one, and run them sequentially
4502 so that debugging output doesn't get intertwined, and to avoid spawning too
4503 many processes if a long list is given. However, don't fork for the last one;
4504 this saves a process in the common case when Exim is called to deliver just one
4507 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4509 if (prod_requires_admin && !admin_user)
4511 fprintf(stderr, "exim: Permission denied\n");
4512 exim_exit(EXIT_FAILURE);
4514 set_process_info("delivering specified messages");
4515 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4516 for (i = msg_action_arg; i < argc; i++)
4521 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4522 else if ((pid = fork()) == 0)
4524 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4525 _exit(EXIT_SUCCESS);
4529 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4531 exim_exit(EXIT_FAILURE);
4535 exim_exit(EXIT_SUCCESS);
4539 /* If only a single queue run is requested, without SMTP listening, we can just
4540 turn into a queue runner, with an optional starting message id. */
4542 if (queue_interval == 0 && !daemon_listen)
4544 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4545 (start_queue_run_id == NULL)? US"" : US" starting at ",
4546 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4547 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4548 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4549 set_process_info("running the queue (single queue run)");
4550 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4551 exim_exit(EXIT_SUCCESS);
4555 /* Find the login name of the real user running this process. This is always
4556 needed when receiving a message, because it is written into the spool file. It
4557 may also be used to construct a from: or a sender: header, and in this case we
4558 need the user's full name as well, so save a copy of it, checked for RFC822
4559 syntax and munged if necessary, if it hasn't previously been set by the -F
4560 argument. We may try to get the passwd entry more than once, in case NIS or
4561 other delays are in evidence. Save the home directory for use in filter testing
4566 if ((pw = getpwuid(real_uid)) != NULL)
4568 originator_login = string_copy(US pw->pw_name);
4569 originator_home = string_copy(US pw->pw_dir);
4571 /* If user name has not been set by -F, set it from the passwd entry
4572 unless -f has been used to set the sender address by a trusted user. */
4574 if (originator_name == NULL)
4576 if (sender_address == NULL ||
4577 (!trusted_caller && filter_test == FTEST_NONE))
4579 uschar *name = US pw->pw_gecos;
4580 uschar *amp = Ustrchr(name, '&');
4583 /* Most Unix specify that a '&' character in the gecos field is
4584 replaced by a copy of the login name, and some even specify that
4585 the first character should be upper cased, so that's what we do. */
4590 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4591 amp - name, name, &loffset, originator_login, amp + 1);
4592 buffer[loffset] = toupper(buffer[loffset]);
4596 /* If a pattern for matching the gecos field was supplied, apply
4597 it and then expand the name string. */
4599 if (gecos_pattern != NULL && gecos_name != NULL)
4602 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4604 if (regex_match_and_setup(re, name, 0, -1))
4606 uschar *new_name = expand_string(gecos_name);
4608 if (new_name != NULL)
4610 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4611 "gecos field \"%s\"\n", new_name, name);
4614 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4615 "\"%s\": %s\n", gecos_name, expand_string_message);
4617 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4618 "gecos field \"%s\"\n", gecos_pattern, name);
4619 store_free((void *)re);
4621 originator_name = string_copy(name);
4624 /* A trusted caller has used -f but not -F */
4626 else originator_name = US"";
4629 /* Break the retry loop */
4634 if (++i > finduser_retries) break;
4638 /* If we cannot get a user login, log the incident and give up, unless the
4639 configuration specifies something to use. When running in the test harness,
4640 any setting of unknown_login overrides the actual name. */
4642 if (originator_login == NULL || running_in_test_harness)
4644 if (unknown_login != NULL)
4646 originator_login = expand_string(unknown_login);
4647 if (originator_name == NULL && unknown_username != NULL)
4648 originator_name = expand_string(unknown_username);
4649 if (originator_name == NULL) originator_name = US"";
4651 if (originator_login == NULL)
4652 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4656 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4659 originator_name = string_copy(parse_fix_phrase(originator_name,
4660 Ustrlen(originator_name), big_buffer, big_buffer_size));
4662 /* If a message is created by this call of Exim, the uid/gid of its originator
4663 are those of the caller. These values are overridden if an existing message is
4664 read in from the spool. */
4666 originator_uid = real_uid;
4667 originator_gid = real_gid;
4669 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4670 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4672 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4673 returns. We leave this till here so that the originator_ fields are available
4674 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4677 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4681 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4682 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4683 "mua_wrapper is set");
4688 /* If the sender ident has not been set (by a trusted caller) set it to
4689 the caller. This will get overwritten below for an inetd call. If a trusted
4690 caller has set it empty, unset it. */
4692 if (sender_ident == NULL) sender_ident = originator_login;
4693 else if (sender_ident[0] == 0) sender_ident = NULL;
4695 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4696 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4697 originator_* variables set. */
4699 if (test_rewrite_arg >= 0)
4701 really_exim = FALSE;
4702 if (test_rewrite_arg >= argc)
4704 printf("-brw needs an address argument\n");
4705 exim_exit(EXIT_FAILURE);
4707 rewrite_test(argv[test_rewrite_arg]);
4708 exim_exit(EXIT_SUCCESS);
4711 /* A locally-supplied message is considered to be coming from a local user
4712 unless a trusted caller supplies a sender address with -f, or is passing in the
4713 message via SMTP (inetd invocation or otherwise). */
4715 if ((sender_address == NULL && !smtp_input) ||
4716 (!trusted_caller && filter_test == FTEST_NONE))
4718 sender_local = TRUE;
4720 /* A trusted caller can supply authenticated_sender and authenticated_id
4721 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4722 defaults except when host checking. */
4724 if (authenticated_sender == NULL && !host_checking)
4725 authenticated_sender = string_sprintf("%s@%s", originator_login,
4726 qualify_domain_sender);
4727 if (authenticated_id == NULL && !host_checking)
4728 authenticated_id = originator_login;
4731 /* Trusted callers are always permitted to specify the sender address.
4732 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4733 is specified is the empty address. However, if a trusted caller does not
4734 specify a sender address for SMTP input, we leave sender_address unset. This
4735 causes the MAIL commands to be honoured. */
4737 if ((!smtp_input && sender_address == NULL) ||
4738 !receive_check_set_sender(sender_address))
4740 /* Either the caller is not permitted to set a general sender, or this is
4741 non-SMTP input and the trusted caller has not set a sender. If there is no
4742 sender, or if a sender other than <> is set, override with the originator's
4743 login (which will get qualified below), except when checking things. */
4745 if (sender_address == NULL /* No sender_address set */
4747 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4748 !checking && /* Not running tests, AND */
4749 filter_test == FTEST_NONE)) /* Not testing a filter */
4751 sender_address = originator_login;
4752 sender_address_forced = FALSE;
4753 sender_address_domain = 0;
4757 /* Remember whether an untrusted caller set the sender address */
4759 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4761 /* Ensure that the sender address is fully qualified unless it is the empty
4762 address, which indicates an error message, or doesn't exist (root caller, smtp
4763 interface, no -f argument). */
4765 if (sender_address != NULL && sender_address[0] != 0 &&
4766 sender_address_domain == 0)
4767 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4768 qualify_domain_sender);
4770 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4772 /* Handle a request to verify a list of addresses, or test them for delivery.
4773 This must follow the setting of the sender address, since routers can be
4774 predicated upon the sender. If no arguments are given, read addresses from
4775 stdin. Set debug_level to at least D_v to get full output for address testing.
4778 if (verify_address_mode || address_test_mode)
4781 int flags = vopt_qualify;
4783 if (verify_address_mode)
4785 if (!verify_as_sender) flags |= vopt_is_recipient;
4786 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4791 flags |= vopt_is_recipient;
4792 debug_selector |= D_v;
4793 debug_file = stderr;
4794 debug_fd = fileno(debug_file);
4795 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4798 if (recipients_arg < argc)
4800 while (recipients_arg < argc)
4802 uschar *s = argv[recipients_arg++];
4805 BOOL finished = FALSE;
4806 uschar *ss = parse_find_address_end(s, FALSE);
4807 if (*ss == ',') *ss = 0; else finished = TRUE;
4808 test_address(s, flags, &exit_value);
4811 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4818 uschar *s = get_stdinput(NULL, NULL);
4819 if (s == NULL) break;
4820 test_address(s, flags, &exit_value);
4824 exim_exit(exit_value);
4827 /* Handle expansion checking. Either expand items on the command line, or read
4828 from stdin if there aren't any. If -Mset was specified, load the message so
4829 that its variables can be used, but restrict this facility to admin users.
4830 Otherwise, if -bem was used, read a message from stdin. */
4834 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4836 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4839 fprintf(stderr, "exim: permission denied\n");
4842 message_id = argv[msg_action_arg];
4843 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4844 if (!spool_open_datafile(message_id))
4845 printf ("Failed to load message datafile %s\n", message_id);
4846 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4847 printf ("Failed to load message %s\n", message_id);
4850 /* Read a test message from a file. We fudge it up to be on stdin, saving
4851 stdin itself for later reading of expansion strings. */
4853 else if (expansion_test_message != NULL)
4855 int save_stdin = dup(0);
4856 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4859 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4861 return EXIT_FAILURE;
4864 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4865 message_ended = END_NOTENDED;
4866 read_message_body(receive_msg(extract_recipients));
4867 message_linecount += body_linecount;
4868 (void)dup2(save_stdin, 0);
4869 (void)close(save_stdin);
4870 clearerr(stdin); /* Required by Darwin */
4873 /* Allow $recipients for this testing */
4875 enable_dollar_recipients = TRUE;
4877 /* Expand command line items */
4879 if (recipients_arg < argc)
4881 while (recipients_arg < argc)
4883 uschar *s = argv[recipients_arg++];
4884 uschar *ss = expand_string(s);
4885 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4886 else printf("%s\n", CS ss);
4894 char *(*fn_readline)(const char *) = NULL;
4895 void (*fn_addhist)(const char *) = NULL;
4898 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4904 uschar *source = get_stdinput(fn_readline, fn_addhist);
4905 if (source == NULL) break;
4906 ss = expand_string(source);
4908 printf ("Failed: %s\n", expand_string_message);
4909 else printf("%s\n", CS ss);
4913 if (dlhandle != NULL) dlclose(dlhandle);
4917 /* The data file will be open after -Mset */
4919 if (deliver_datafile >= 0)
4921 (void)close(deliver_datafile);
4922 deliver_datafile = -1;
4925 exim_exit(EXIT_SUCCESS);
4929 /* The active host name is normally the primary host name, but it can be varied
4930 for hosts that want to play several parts at once. We need to ensure that it is
4931 set for host checking, and for receiving messages. */
4933 smtp_active_hostname = primary_hostname;
4934 if (raw_active_hostname != NULL)
4936 uschar *nah = expand_string(raw_active_hostname);
4939 if (!expand_string_forcedfail)
4940 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4941 "(smtp_active_hostname): %s", raw_active_hostname,
4942 expand_string_message);
4944 else if (nah[0] != 0) smtp_active_hostname = nah;
4947 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4948 given IP address so that the blocking and relay configuration can be tested.
4949 Unless a sender_ident was set by -oMt, we discard it (the default is the
4950 caller's login name). An RFC 1413 call is made only if we are running in the
4951 test harness and an incoming interface and both ports are specified, because
4952 there is no TCP/IP call to find the ident for. */
4959 if (!sender_ident_set)
4961 sender_ident = NULL;
4962 if (running_in_test_harness && sender_host_port != 0 &&
4963 interface_address != NULL && interface_port != 0)
4964 verify_get_ident(1413);
4967 /* In case the given address is a non-canonical IPv6 address, canonicize
4968 it. The code works for both IPv4 and IPv6, as it happens. */
4970 size = host_aton(sender_host_address, x);
4971 sender_host_address = store_get(48); /* large enough for full IPv6 */
4972 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4974 /* Now set up for testing */
4976 host_build_sender_fullhost();
4980 sender_local = FALSE;
4981 sender_host_notsocket = TRUE;
4982 debug_file = stderr;
4983 debug_fd = fileno(debug_file);
4984 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4985 "**** but without any ident (RFC 1413) callback.\n"
4986 "**** This is not for real!\n\n",
4987 sender_host_address);
4989 if (verify_check_host(&hosts_connection_nolog) == OK)
4990 log_write_selector &= ~L_smtp_connection;
4991 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4993 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4994 because a log line has already been written for all its failure exists
4995 (usually "connection refused: <reason>") and writing another one is
4996 unnecessary clutter. */
4998 if (smtp_start_session())
5000 reset_point = store_get(0);
5003 store_reset(reset_point);
5004 if (smtp_setup_msg() <= 0) break;
5005 if (!receive_msg(FALSE)) break;
5009 exim_exit(EXIT_SUCCESS);
5013 /* Arrange for message reception if recipients or SMTP were specified;
5014 otherwise complain unless a version print (-bV) happened or this is a filter
5015 verification test or info dump.
5016 In the former case, show the configuration file name. */
5018 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5020 if (version_printed)
5022 printf("Configuration file is %s\n", config_main_filename);
5023 return EXIT_SUCCESS;
5026 if (info_flag != CMDINFO_NONE)
5028 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5029 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5032 if (filter_test == FTEST_NONE)
5033 exim_usage(called_as);
5037 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5038 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5039 that we are not called from inetd, because that is rejected above. The
5040 following configuration settings are forced here:
5042 (1) Synchronous delivery (-odi)
5043 (2) Errors to stderr (-oep == -oeq)
5044 (3) No parallel remote delivery
5045 (4) Unprivileged delivery
5047 We don't force overall queueing options because there are several of them;
5048 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5049 to override any SMTP queueing. */
5053 synchronous_delivery = TRUE;
5054 arg_error_handling = ERRORS_STDERR;
5055 remote_max_parallel = 1;
5056 deliver_drop_privilege = TRUE;
5058 queue_smtp_domains = NULL;
5062 /* Prepare to accept one or more new messages on the standard input. When a
5063 message has been read, its id is returned in message_id[]. If doing immediate
5064 delivery, we fork a delivery process for each received message, except for the
5065 last one, where we can save a process switch.
5067 It is only in non-smtp mode that error_handling is allowed to be changed from
5068 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5069 sendmail error modes other than -oem ever actually used? Later: yes.) */
5071 if (!smtp_input) error_handling = arg_error_handling;
5073 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5074 logging being sent down the socket and make an identd call to get the
5079 (void)fclose(stderr);
5080 exim_nullstd(); /* Re-open to /dev/null */
5081 verify_get_ident(IDENT_PORT);
5082 host_build_sender_fullhost();
5083 set_process_info("handling incoming connection from %s via inetd",
5087 /* If the sender host address has been set, build sender_fullhost if it hasn't
5088 already been done (which it will have been for inetd). This caters for the
5089 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5090 so that the test for IP options is skipped for -bs input. */
5092 if (sender_host_address != NULL && sender_fullhost == NULL)
5094 host_build_sender_fullhost();
5095 set_process_info("handling incoming connection from %s via -oMa",
5097 sender_host_notsocket = TRUE;
5100 /* Otherwise, set the sender host as unknown except for inetd calls. This
5101 prevents host checking in the case of -bs not from inetd and also for -bS. */
5103 else if (!is_inetd) sender_host_unknown = TRUE;
5105 /* If stdout does not exist, then dup stdin to stdout. This can happen
5106 if exim is started from inetd. In this case fd 0 will be set to the socket,
5107 but fd 1 will not be set. This also happens for passed SMTP channels. */
5109 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5111 /* Set up the incoming protocol name and the state of the program. Root is
5112 allowed to force received protocol via the -oMr option above. If we have come
5113 via inetd, the process info has already been set up. We don't set
5114 received_protocol here for smtp input, as it varies according to
5115 batch/HELO/EHLO/AUTH/TLS. */
5119 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5120 smtp_batched_input? "batched " : "",
5121 (sender_address!= NULL)? sender_address : originator_login);
5125 if (received_protocol == NULL)
5126 received_protocol = string_sprintf("local%s", called_as);
5127 set_process_info("accepting a local non-SMTP message from <%s>",
5131 /* Initialize the session_local_queue-only flag (this will be ignored if
5132 mua_wrapper is set) */
5135 session_local_queue_only = queue_only;
5137 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5138 the spool if so configured. On failure, we must not attempt to send an error
5139 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5140 error code is given.) */
5142 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5144 fprintf(stderr, "exim: insufficient disk space\n");
5145 return EXIT_FAILURE;
5148 /* If this is smtp input of any kind, real or batched, handle the start of the
5151 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5152 because a log line has already been written for all its failure exists
5153 (usually "connection refused: <reason>") and writing another one is
5154 unnecessary clutter. */
5160 if (verify_check_host(&hosts_connection_nolog) == OK)
5161 log_write_selector &= ~L_smtp_connection;
5162 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5163 if (!smtp_start_session())
5166 exim_exit(EXIT_SUCCESS);
5170 /* Otherwise, set up the input size limit here. */
5174 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5175 if (expand_string_message != NULL)
5177 if (thismessage_size_limit == -1)
5178 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5179 "message_size_limit: %s", expand_string_message);
5181 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5182 "message_size_limit: %s", expand_string_message);
5186 /* Loop for several messages when reading SMTP input. If we fork any child
5187 processes, we don't want to wait for them unless synchronous delivery is
5188 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5189 same as SIG_DFL, despite the fact that documentation often lists the default as
5190 "ignore". This is a confusing area. This is what I know:
5192 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5193 processes that complete simply to go away without ever becoming defunct. You
5194 can't then wait for them - but we don't want to wait for them in the
5195 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5196 happen for all OS (e.g. *BSD is different).
5198 But that's not the end of the story. Some (many? all?) systems have the
5199 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5200 has by default, so it seems that the difference is merely one of default
5201 (compare restarting vs non-restarting signals).
5203 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5204 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5205 of the loop below. Paranoia rules.
5207 February 2003: That's *still* not the end of the story. There are now versions
5208 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5209 process then calls waitpid(), a grumble is written to the system log, because
5210 this is logically inconsistent. In other words, it doesn't like the paranoia.
5211 As a consequenc of this, the waitpid() below is now excluded if we are sure
5212 that SIG_IGN works. */
5214 if (!synchronous_delivery)
5217 struct sigaction act;
5218 act.sa_handler = SIG_IGN;
5219 sigemptyset(&(act.sa_mask));
5220 act.sa_flags = SA_NOCLDWAIT;
5221 sigaction(SIGCHLD, &act, NULL);
5223 signal(SIGCHLD, SIG_IGN);
5227 /* Save the current store pool point, for resetting at the start of
5228 each message, and save the real sender address, if any. */
5230 reset_point = store_get(0);
5231 real_sender_address = sender_address;
5233 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5234 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5239 store_reset(reset_point);
5242 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5243 input and build the recipients list, before calling receive_msg() to read the
5244 message proper. Whatever sender address is given in the SMTP transaction is
5245 often ignored for local senders - we use the actual sender, which is normally
5246 either the underlying user running this process or a -f argument provided by
5247 a trusted caller. It is saved in real_sender_address. The test for whether to
5248 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5253 if ((rc = smtp_setup_msg()) > 0)
5255 if (real_sender_address != NULL &&
5256 !receive_check_set_sender(sender_address))
5258 sender_address = raw_sender = real_sender_address;
5259 sender_address_unrewritten = NULL;
5262 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5263 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5264 the very end. The result of the ACL is ignored (as for other non-SMTP
5265 messages). It is run for its potential side effects. */
5267 if (smtp_batched_input && acl_not_smtp_start != NULL)
5269 uschar *user_msg, *log_msg;
5270 enable_dollar_recipients = TRUE;
5271 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5272 &user_msg, &log_msg);
5273 enable_dollar_recipients = FALSE;
5276 /* Now get the data for the message */
5278 more = receive_msg(extract_recipients);
5279 if (message_id[0] == 0)
5282 smtp_log_no_mail(); /* Log no mail if configured */
5283 exim_exit(EXIT_FAILURE);
5288 smtp_log_no_mail(); /* Log no mail if configured */
5289 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5293 /* In the non-SMTP case, we have all the information from the command
5294 line, but must process it in case it is in the more general RFC822
5295 format, and in any case, to detect syntax errors. Also, it appears that
5296 the use of comma-separated lists as single arguments is common, so we
5297 had better support them. */
5303 int count = argc - recipients_arg;
5304 uschar **list = argv + recipients_arg;
5306 /* These options cannot be changed dynamically for non-SMTP messages */
5308 active_local_sender_retain = local_sender_retain;
5309 active_local_from_check = local_from_check;
5311 /* Save before any rewriting */
5313 raw_sender = string_copy(sender_address);
5315 /* Loop for each argument */
5317 for (i = 0; i < count; i++)
5319 int start, end, domain;
5321 uschar *s = list[i];
5323 /* Loop for each comma-separated address */
5327 BOOL finished = FALSE;
5329 uschar *ss = parse_find_address_end(s, FALSE);
5331 if (*ss == ',') *ss = 0; else finished = TRUE;
5333 /* Check max recipients - if -t was used, these aren't recipients */
5335 if (recipients_max > 0 && ++rcount > recipients_max &&
5336 !extract_recipients)
5338 if (error_handling == ERRORS_STDERR)
5340 fprintf(stderr, "exim: too many recipients\n");
5341 exim_exit(EXIT_FAILURE);
5346 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5347 errors_sender_rc : EXIT_FAILURE;
5352 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5354 if (domain == 0 && !allow_unqualified_recipient)
5357 errmess = US"unqualified recipient address not allowed";
5360 if (recipient == NULL)
5362 if (error_handling == ERRORS_STDERR)
5364 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5365 string_printing(list[i]), errmess);
5366 exim_exit(EXIT_FAILURE);
5372 eblock.text1 = string_printing(list[i]);
5373 eblock.text2 = errmess;
5375 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5376 errors_sender_rc : EXIT_FAILURE;
5380 receive_add_recipient(recipient, -1);
5383 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5387 /* Show the recipients when debugging */
5392 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5393 if (recipients_list != NULL)
5395 debug_printf("Recipients:\n");
5396 for (i = 0; i < recipients_count; i++)
5397 debug_printf(" %s\n", recipients_list[i].address);
5401 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5402 ignored; rejecting here would just add complication, and it can just as
5403 well be done later. Allow $recipients to be visible in the ACL. */
5405 if (acl_not_smtp_start != NULL)
5407 uschar *user_msg, *log_msg;
5408 enable_dollar_recipients = TRUE;
5409 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5410 &user_msg, &log_msg);
5411 enable_dollar_recipients = FALSE;
5414 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5415 will just read the headers for the message, and not write anything onto the
5418 message_ended = END_NOTENDED;
5419 more = receive_msg(extract_recipients);
5421 /* more is always FALSE here (not SMTP message) when reading a message
5422 for real; when reading the headers of a message for filter testing,
5423 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5425 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5426 } /* Non-SMTP message reception */
5428 /* If this is a filter testing run, there are headers in store, but
5429 no message on the spool. Run the filtering code in testing mode, setting
5430 the domain to the qualify domain and the local part to the current user,
5431 unless they have been set by options. The prefix and suffix are left unset
5432 unless specified. The the return path is set to to the sender unless it has
5433 already been set from a return-path header in the message. */
5435 if (filter_test != FTEST_NONE)
5437 deliver_domain = (ftest_domain != NULL)?
5438 ftest_domain : qualify_domain_recipient;
5439 deliver_domain_orig = deliver_domain;
5440 deliver_localpart = (ftest_localpart != NULL)?
5441 ftest_localpart : originator_login;
5442 deliver_localpart_orig = deliver_localpart;
5443 deliver_localpart_prefix = ftest_prefix;
5444 deliver_localpart_suffix = ftest_suffix;
5445 deliver_home = originator_home;
5447 if (return_path == NULL)
5449 printf("Return-path copied from sender\n");
5450 return_path = string_copy(sender_address);
5454 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5456 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5458 receive_add_recipient(
5459 string_sprintf("%s%s%s@%s",
5460 (ftest_prefix == NULL)? US"" : ftest_prefix,
5462 (ftest_suffix == NULL)? US"" : ftest_suffix,
5463 deliver_domain), -1);
5465 printf("Recipient = %s\n", recipients_list[0].address);
5466 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5467 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5469 if (chdir("/")) /* Get away from wherever the user is running this from */
5471 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5472 exim_exit(EXIT_FAILURE);
5475 /* Now we run either a system filter test, or a user filter test, or both.
5476 In the latter case, headers added by the system filter will persist and be
5477 available to the user filter. We need to copy the filter variables
5480 if ((filter_test & FTEST_SYSTEM) != 0)
5482 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5483 exim_exit(EXIT_FAILURE);
5486 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5488 if ((filter_test & FTEST_USER) != 0)
5490 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5491 exim_exit(EXIT_FAILURE);
5494 exim_exit(EXIT_SUCCESS);
5497 /* Else act on the result of message reception. We should not get here unless
5498 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5499 will be TRUE. If it is not, check on the number of messages received in this
5502 if (!session_local_queue_only &&
5503 smtp_accept_queue_per_connection > 0 &&
5504 receive_messagecount > smtp_accept_queue_per_connection)
5506 session_local_queue_only = TRUE;
5507 queue_only_reason = 2;
5510 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5511 and queue_only_load is set, check that the load average is below it. If it is
5512 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5513 default), we put the whole session into queue_only mode. It then remains this
5514 way for any subsequent messages on the same SMTP connection. This is a
5515 deliberate choice; even though the load average may fall, it doesn't seem
5516 right to deliver later messages on the same call when not delivering earlier
5517 ones. However, there are odd cases where this is not wanted, so this can be
5518 changed by setting queue_only_load_latch false. */
5520 local_queue_only = session_local_queue_only;
5521 if (!local_queue_only && queue_only_load >= 0)
5523 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5524 if (local_queue_only)
5526 queue_only_reason = 3;
5527 if (queue_only_load_latch) session_local_queue_only = TRUE;
5531 /* If running as an MUA wrapper, all queueing options and freezing options
5535 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5537 /* Log the queueing here, when it will get a message id attached, but
5538 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5541 if (local_queue_only) switch(queue_only_reason)
5544 log_write(L_delay_delivery,
5545 LOG_MAIN, "no immediate delivery: more than %d messages "
5546 "received in one connection", smtp_accept_queue_per_connection);
5550 log_write(L_delay_delivery,
5551 LOG_MAIN, "no immediate delivery: load average %.2f",
5552 (double)load_average/1000.0);
5556 /* Else do the delivery unless the ACL or local_scan() called for queue only
5557 or froze the message. Always deliver in a separate process. A fork failure is
5558 not a disaster, as the delivery will eventually happen on a subsequent queue
5559 run. The search cache must be tidied before the fork, as the parent will
5560 do it before exiting. The child will trigger a lookup failure and
5561 thereby defer the delivery if it tries to use (for example) a cached ldap
5562 connection that the parent has called unbind on. */
5564 else if (!queue_only_policy && !deliver_freeze)
5569 if ((pid = fork()) == 0)
5572 close_unwanted(); /* Close unwanted file descriptors and TLS */
5573 exim_nullstd(); /* Ensure std{in,out,err} exist */
5575 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5576 mode, deliver_drop_privilege is forced TRUE). */
5578 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5580 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5582 /* Control does not return here. */
5585 /* No need to re-exec */
5587 rc = deliver_message(message_id, FALSE, FALSE);
5589 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5590 EXIT_SUCCESS : EXIT_FAILURE);
5595 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5596 "process: %s", strerror(errno));
5599 /* In the parent, wait if synchronous delivery is required. This will
5600 always be the case in MUA wrapper mode. */
5602 else if (synchronous_delivery)
5605 while (wait(&status) != pid);
5606 if ((status & 0x00ff) != 0)
5607 log_write(0, LOG_MAIN|LOG_PANIC,
5608 "process %d crashed with signal %d while delivering %s",
5609 (int)pid, status & 0x00ff, message_id);
5610 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5614 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5615 automatically reaps children (see comments above the loop), clear away any
5616 finished subprocesses here, in case there are lots of messages coming in
5617 from the same source. */
5619 #ifndef SIG_IGN_WORKS
5620 while (waitpid(-1, NULL, WNOHANG) > 0);
5624 exim_exit(EXIT_SUCCESS); /* Never returns */
5625 return 0; /* To stop compiler warning */