1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, 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_SOCKS
857 fprintf(f, " Experimental_SOCKS");
859 #ifdef EXPERIMENTAL_INTERNATIONAL
860 fprintf(f, " Experimental_International");
864 fprintf(f, "Lookups (built-in):");
865 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
866 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
868 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
871 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
872 fprintf(f, " dbm dbmjz dbmnz");
874 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
875 fprintf(f, " dnsdb");
877 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
878 fprintf(f, " dsearch");
880 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
881 fprintf(f, " ibase");
883 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
884 fprintf(f, " ldap ldapdn ldapm");
886 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
887 fprintf(f, " mysql");
889 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
890 fprintf(f, " nis nis0");
892 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
893 fprintf(f, " nisplus");
895 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
896 fprintf(f, " oracle");
898 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
899 fprintf(f, " passwd");
901 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
902 fprintf(f, " pgsql");
904 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
905 fprintf(f, " sqlite");
907 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
908 fprintf(f, " testdb");
910 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
911 fprintf(f, " whoson");
915 fprintf(f, "Authenticators:");
917 fprintf(f, " cram_md5");
919 #ifdef AUTH_CYRUS_SASL
920 fprintf(f, " cyrus_sasl");
923 fprintf(f, " dovecot");
926 fprintf(f, " gsasl");
928 #ifdef AUTH_HEIMDAL_GSSAPI
929 fprintf(f, " heimdal_gssapi");
931 #ifdef AUTH_PLAINTEXT
932 fprintf(f, " plaintext");
939 fprintf(f, "Routers:");
941 fprintf(f, " accept");
943 #ifdef ROUTER_DNSLOOKUP
944 fprintf(f, " dnslookup");
946 #ifdef ROUTER_IPLITERAL
947 fprintf(f, " ipliteral");
949 #ifdef ROUTER_IPLOOKUP
950 fprintf(f, " iplookup");
952 #ifdef ROUTER_MANUALROUTE
953 fprintf(f, " manualroute");
955 #ifdef ROUTER_QUERYPROGRAM
956 fprintf(f, " queryprogram");
958 #ifdef ROUTER_REDIRECT
959 fprintf(f, " redirect");
963 fprintf(f, "Transports:");
964 #ifdef TRANSPORT_APPENDFILE
965 fprintf(f, " appendfile");
966 #ifdef SUPPORT_MAILDIR
967 fprintf(f, "/maildir");
969 #ifdef SUPPORT_MAILSTORE
970 fprintf(f, "/mailstore");
976 #ifdef TRANSPORT_AUTOREPLY
977 fprintf(f, " autoreply");
979 #ifdef TRANSPORT_LMTP
982 #ifdef TRANSPORT_PIPE
985 #ifdef TRANSPORT_SMTP
990 if (fixed_never_users[0] > 0)
993 fprintf(f, "Fixed never_users: ");
994 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
995 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
996 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
999 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1001 /* Everything else is details which are only worth reporting when debugging.
1002 Perhaps the tls_version_report should move into this too. */
1007 /* clang defines __GNUC__ (at least, for me) so test for it first */
1008 #if defined(__clang__)
1009 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1010 #elif defined(__GNUC__)
1011 fprintf(f, "Compiler: GCC [%s]\n",
1015 "? unknown version ?"
1019 fprintf(f, "Compiler: <unknown>\n");
1023 tls_version_report(f);
1025 #ifdef EXPERIMENTAL_INTERNATIONAL
1026 utf8_version_report(f);
1029 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1030 if (authi->version_report) {
1031 (*authi->version_report)(f);
1035 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1036 characters; unless it's an ancient version of PCRE in which case it
1038 #ifndef PCRE_PRERELEASE
1039 #define PCRE_PRERELEASE
1042 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1043 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1045 PCRE_MAJOR, PCRE_MINOR,
1046 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1049 #undef EXPAND_AND_QUOTE
1052 for (i = 0; i < lookup_list_count; i++)
1054 if (lookup_list[i]->version_report)
1055 lookup_list[i]->version_report(f);
1058 #ifdef WHITELIST_D_MACROS
1059 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1061 fprintf(f, "WHITELIST_D_MACROS unset\n");
1063 #ifdef TRUSTED_CONFIG_LIST
1064 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1066 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1073 /*************************************************
1074 * Show auxiliary information about Exim *
1075 *************************************************/
1078 show_exim_information(enum commandline_info request, FILE *stream)
1085 fprintf(stream, "Oops, something went wrong.\n");
1089 "The -bI: flag takes a string indicating which information to provide.\n"
1090 "If the string is not recognised, you'll get this help (on stderr).\n"
1092 " exim -bI:help this information\n"
1093 " exim -bI:dscp dscp value keywords known\n"
1094 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1098 for (pp = exim_sieve_extension_list; *pp; ++pp)
1099 fprintf(stream, "%s\n", *pp);
1102 dscp_list_to_stream(stream);
1108 /*************************************************
1109 * Quote a local part *
1110 *************************************************/
1112 /* This function is used when a sender address or a From: or Sender: header
1113 line is being created from the caller's login, or from an authenticated_id. It
1114 applies appropriate quoting rules for a local part.
1116 Argument: the local part
1117 Returns: the local part, quoted if necessary
1121 local_part_quote(uschar *lpart)
1123 BOOL needs_quote = FALSE;
1128 for (t = lpart; !needs_quote && *t != 0; t++)
1130 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1131 (*t != '.' || t == lpart || t[1] == 0);
1134 if (!needs_quote) return lpart;
1137 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1141 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1144 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1147 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1148 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1149 yield = string_cat(yield, &size, &ptr, nq, 1);
1153 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1161 /*************************************************
1162 * Load readline() functions *
1163 *************************************************/
1165 /* This function is called from testing executions that read data from stdin,
1166 but only when running as the calling user. Currently, only -be does this. The
1167 function loads the readline() function library and passes back the functions.
1168 On some systems, it needs the curses library, so load that too, but try without
1169 it if loading fails. All this functionality has to be requested at build time.
1172 fn_readline_ptr pointer to where to put the readline pointer
1173 fn_addhist_ptr pointer to where to put the addhistory function
1175 Returns: the dlopen handle or NULL on failure
1179 set_readline(char * (**fn_readline_ptr)(const char *),
1180 void (**fn_addhist_ptr)(const char *))
1183 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1185 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1186 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1188 if (dlhandle != NULL)
1190 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1191 * char * readline (const char *prompt);
1192 * void add_history (const char *string);
1194 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1195 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1199 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1208 /*************************************************
1209 * Get a line from stdin for testing things *
1210 *************************************************/
1212 /* This function is called when running tests that can take a number of lines
1213 of input (for example, -be and -bt). It handles continuations and trailing
1214 spaces. And prompting and a blank line output on eof. If readline() is in use,
1215 the arguments are non-NULL and provide the relevant functions.
1218 fn_readline readline function or NULL
1219 fn_addhist addhist function or NULL
1221 Returns: pointer to dynamic memory, or NULL at end of file
1225 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1230 uschar *yield = NULL;
1232 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1236 uschar buffer[1024];
1240 char *readline_line = NULL;
1241 if (fn_readline != NULL)
1243 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1244 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1245 p = US readline_line;
1250 /* readline() not in use */
1253 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1257 /* Handle the line */
1259 ss = p + (int)Ustrlen(p);
1260 while (ss > p && isspace(ss[-1])) ss--;
1264 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1267 yield = string_cat(yield, &size, &ptr, p, ss - p);
1270 if (fn_readline != NULL) free(readline_line);
1273 if (ss == p || yield[ptr-1] != '\\')
1281 if (yield == NULL) printf("\n");
1287 /*************************************************
1288 * Output usage information for the program *
1289 *************************************************/
1291 /* This function is called when there are no recipients
1292 or a specific --help argument was added.
1295 progname information on what name we were called by
1297 Returns: DOES NOT RETURN
1301 exim_usage(uschar *progname)
1304 /* Handle specific program invocation varients */
1305 if (Ustrcmp(progname, US"-mailq") == 0)
1308 "mailq - list the contents of the mail queue\n\n"
1309 "For a list of options, see the Exim documentation.\n");
1313 /* Generic usage - we output this whatever happens */
1315 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1316 "not directly from a shell command line. Options and/or arguments control\n"
1317 "what it does when called. For a list of options, see the Exim documentation.\n");
1324 /*************************************************
1325 * Validate that the macros given are okay *
1326 *************************************************/
1328 /* Typically, Exim will drop privileges if macros are supplied. In some
1329 cases, we want to not do so.
1331 Arguments: none (macros is a global)
1332 Returns: true if trusted, false otherwise
1336 macros_trusted(void)
1338 #ifdef WHITELIST_D_MACROS
1340 uschar *whitelisted, *end, *p, **whites, **w;
1341 int white_count, i, n;
1343 BOOL prev_char_item, found;
1348 #ifndef WHITELIST_D_MACROS
1352 /* We only trust -D overrides for some invoking users:
1353 root, the exim run-time user, the optional config owner user.
1354 I don't know why config-owner would be needed, but since they can own the
1355 config files anyway, there's no security risk to letting them override -D. */
1356 if ( ! ((real_uid == root_uid)
1357 || (real_uid == exim_uid)
1358 #ifdef CONFIGURE_OWNER
1359 || (real_uid == config_uid)
1363 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1367 /* Get a list of macros which are whitelisted */
1368 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1369 prev_char_item = FALSE;
1371 for (p = whitelisted; *p != '\0'; ++p)
1373 if (*p == ':' || isspace(*p))
1378 prev_char_item = FALSE;
1381 if (!prev_char_item)
1382 prev_char_item = TRUE;
1389 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1390 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1395 if (i == white_count)
1397 while (*p != '\0' && p < end)
1403 /* The list of macros should be very short. Accept the N*M complexity. */
1404 for (m = macros; m != NULL; m = m->next)
1407 for (w = whites; *w; ++w)
1408 if (Ustrcmp(*w, m->name) == 0)
1415 if (m->replacement == NULL)
1417 len = Ustrlen(m->replacement);
1420 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1421 0, PCRE_EOPT, NULL, 0);
1424 if (n != PCRE_ERROR_NOMATCH)
1425 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1429 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1435 /*************************************************
1436 * Entry point and high-level code *
1437 *************************************************/
1439 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1440 the appropriate action. All the necessary functions are present in the one
1441 binary. I originally thought one should split it up, but it turns out that so
1442 much of the apparatus is needed in each chunk that one might as well just have
1443 it all available all the time, which then makes the coding easier as well.
1446 argc count of entries in argv
1447 argv argument strings, with argv[0] being the program name
1449 Returns: EXIT_SUCCESS if terminated successfully
1450 EXIT_FAILURE otherwise, except when a message has been sent
1451 to the sender, and -oee was given
1455 main(int argc, char **cargv)
1457 uschar **argv = USS cargv;
1458 int arg_receive_timeout = -1;
1459 int arg_smtp_receive_timeout = -1;
1460 int arg_error_handling = error_handling;
1461 int filter_sfd = -1;
1462 int filter_ufd = -1;
1465 int list_queue_option = 0;
1467 int msg_action_arg = -1;
1468 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1469 int queue_only_reason = 0;
1471 int perl_start_option = 0;
1473 int recipients_arg = argc;
1474 int sender_address_domain = 0;
1475 int test_retry_arg = -1;
1476 int test_rewrite_arg = -1;
1477 BOOL arg_queue_only = FALSE;
1478 BOOL bi_option = FALSE;
1479 BOOL checking = FALSE;
1480 BOOL count_queue = FALSE;
1481 BOOL expansion_test = FALSE;
1482 BOOL extract_recipients = FALSE;
1483 BOOL flag_G = FALSE;
1484 BOOL flag_n = FALSE;
1485 BOOL forced_delivery = FALSE;
1486 BOOL f_end_dot = FALSE;
1487 BOOL deliver_give_up = FALSE;
1488 BOOL list_queue = FALSE;
1489 BOOL list_options = FALSE;
1490 BOOL local_queue_only;
1492 BOOL one_msg_action = FALSE;
1493 BOOL queue_only_set = FALSE;
1494 BOOL receiving_message = TRUE;
1495 BOOL sender_ident_set = FALSE;
1496 BOOL session_local_queue_only;
1498 BOOL removed_privilege = FALSE;
1499 BOOL usage_wanted = FALSE;
1500 BOOL verify_address_mode = FALSE;
1501 BOOL verify_as_sender = FALSE;
1502 BOOL version_printed = FALSE;
1503 uschar *alias_arg = NULL;
1504 uschar *called_as = US"";
1505 uschar *cmdline_syslog_name = NULL;
1506 uschar *start_queue_run_id = NULL;
1507 uschar *stop_queue_run_id = NULL;
1508 uschar *expansion_test_message = NULL;
1509 uschar *ftest_domain = NULL;
1510 uschar *ftest_localpart = NULL;
1511 uschar *ftest_prefix = NULL;
1512 uschar *ftest_suffix = NULL;
1513 uschar *log_oneline = NULL;
1514 uschar *malware_test_file = NULL;
1515 uschar *real_sender_address;
1516 uschar *originator_home = US"/";
1521 struct stat statbuf;
1522 pid_t passed_qr_pid = (pid_t)0;
1523 int passed_qr_pipe = -1;
1524 gid_t group_list[NGROUPS_MAX];
1526 /* For the -bI: flag */
1527 enum commandline_info info_flag = CMDINFO_NONE;
1528 BOOL info_stdout = FALSE;
1530 /* Possible options for -R and -S */
1532 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1534 /* Need to define this in case we need to change the environment in order
1535 to get rid of a bogus time zone. We have to make it char rather than uschar
1536 because some OS define it in /usr/include/unistd.h. */
1538 extern char **environ;
1540 /* If the Exim user and/or group and/or the configuration file owner/group were
1541 defined by ref:name at build time, we must now find the actual uid/gid values.
1542 This is a feature to make the lives of binary distributors easier. */
1544 #ifdef EXIM_USERNAME
1545 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1549 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1553 /* If ref:name uses a number as the name, route_finduser() returns
1554 TRUE with exim_uid set and pw coerced to NULL. */
1556 exim_gid = pw->pw_gid;
1557 #ifndef EXIM_GROUPNAME
1561 "exim: ref:name should specify a usercode, not a group.\n"
1562 "exim: can't let you get away with it unless you also specify a group.\n");
1569 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1575 #ifdef EXIM_GROUPNAME
1576 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1578 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1584 #ifdef CONFIGURE_OWNERNAME
1585 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1587 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1588 CONFIGURE_OWNERNAME);
1593 /* We default the system_filter_user to be the Exim run-time user, as a
1594 sane non-root value. */
1595 system_filter_uid = exim_uid;
1597 #ifdef CONFIGURE_GROUPNAME
1598 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1600 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1601 CONFIGURE_GROUPNAME);
1606 /* In the Cygwin environment, some initialization needs doing. It is fudged
1607 in by means of this macro. */
1613 /* Check a field which is patched when we are running Exim within its
1614 testing harness; do a fast initial check, and then the whole thing. */
1616 running_in_test_harness =
1617 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1619 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1620 at the start of a program; however, it seems that some environments do not
1621 follow this. A "strange" locale can affect the formatting of timestamps, so we
1624 setlocale(LC_ALL, "C");
1626 /* Set up the default handler for timing using alarm(). */
1628 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1630 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1631 because store_malloc writes a log entry on failure. */
1633 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1634 if (log_buffer == NULL)
1636 fprintf(stderr, "exim: failed to get store for log buffer\n");
1640 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1641 NULL when the daemon is run and the file is closed. We have to use this
1642 indirection, because some systems don't allow writing to the variable "stderr".
1645 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1647 /* Arrange for the PCRE regex library to use our store functions. Note that
1648 the normal calls are actually macros that add additional arguments for
1649 debugging purposes so we have to assign specially constructed functions here.
1650 The default is to use store in the stacking pool, but this is overridden in the
1651 regex_must_compile() function. */
1653 pcre_malloc = function_store_get;
1654 pcre_free = function_dummy_free;
1656 /* Ensure there is a big buffer for temporary use in several places. It is put
1657 in malloc store so that it can be freed for enlargement if necessary. */
1659 big_buffer = store_malloc(big_buffer_size);
1661 /* Set up the handler for the data request signal, and set the initial
1662 descriptive text. */
1664 set_process_info("initializing");
1665 os_restarting_signal(SIGUSR1, usr1_handler);
1667 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1668 in the daemon code. For the rest of Exim's uses, we ignore it. */
1670 signal(SIGHUP, SIG_IGN);
1672 /* We don't want to die on pipe errors as the code is written to handle
1673 the write error instead. */
1675 signal(SIGPIPE, SIG_IGN);
1677 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1678 set to SIG_IGN. This causes subprocesses that complete before the parent
1679 process waits for them not to hang around, so when Exim calls wait(), nothing
1680 is there. The wait() code has been made robust against this, but let's ensure
1681 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1682 ending status. We use sigaction rather than plain signal() on those OS where
1683 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1684 problem on AIX with this.) */
1688 struct sigaction act;
1689 act.sa_handler = SIG_DFL;
1690 sigemptyset(&(act.sa_mask));
1692 sigaction(SIGCHLD, &act, NULL);
1695 signal(SIGCHLD, SIG_DFL);
1698 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1703 /* Set up the version number. Set up the leading 'E' for the external form of
1704 message ids, set the pointer to the internal form, and initialize it to
1705 indicate no message being processed. */
1708 message_id_option[0] = '-';
1709 message_id_external = message_id_option + 1;
1710 message_id_external[0] = 'E';
1711 message_id = message_id_external + 1;
1714 /* Set the umask to zero so that any files Exim creates using open() are
1715 created with the modes that it specifies. NOTE: Files created with fopen() have
1716 a problem, which was not recognized till rather late (February 2006). With this
1717 umask, such files will be world writeable. (They are all content scanning files
1718 in the spool directory, which isn't world-accessible, so this is not a
1719 disaster, but it's untidy.) I don't want to change this overall setting,
1720 however, because it will interact badly with the open() calls. Instead, there's
1721 now a function called modefopen() that fiddles with the umask while calling
1726 /* Precompile the regular expression for matching a message id. Keep this in
1727 step with the code that generates ids in the accept.c module. We need to do
1728 this here, because the -M options check their arguments for syntactic validity
1729 using mac_ismsgid, which uses this. */
1732 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1734 /* Precompile the regular expression that is used for matching an SMTP error
1735 code, possibly extended, at the start of an error message. Note that the
1736 terminating whitespace character is included. */
1739 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1742 #ifdef WHITELIST_D_MACROS
1743 /* Precompile the regular expression used to filter the content of macros
1744 given to -D for permissibility. */
1746 regex_whitelisted_macro =
1747 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1751 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1752 this seems to be a generally accepted convention, since one finds symbolic
1753 links called "mailq" in standard OS configurations. */
1755 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1756 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1759 receiving_message = FALSE;
1760 called_as = US"-mailq";
1763 /* If the program is called as "rmail" treat it as equivalent to
1764 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1765 i.e. preventing a single dot on a line from terminating the message, and
1766 returning with zero return code, even in cases of error (provided an error
1767 message has been sent). */
1769 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1770 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1773 called_as = US"-rmail";
1774 errors_sender_rc = EXIT_SUCCESS;
1777 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1778 this is a smail convention. */
1780 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1781 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1783 smtp_input = smtp_batched_input = TRUE;
1784 called_as = US"-rsmtp";
1787 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1788 this is a smail convention. */
1790 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1791 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1794 receiving_message = FALSE;
1795 called_as = US"-runq";
1798 /* If the program is called as "newaliases" treat it as equivalent to
1799 "exim -bi"; this is a sendmail convention. */
1801 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1802 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1805 receiving_message = FALSE;
1806 called_as = US"-newaliases";
1809 /* Save the original effective uid for a couple of uses later. It should
1810 normally be root, but in some esoteric environments it may not be. */
1812 original_euid = geteuid();
1814 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1815 to be the same as the real ones. This makes a difference only if Exim is setuid
1816 (or setgid) to something other than root, which could be the case in some
1817 special configurations. */
1819 real_uid = getuid();
1820 real_gid = getgid();
1822 if (real_uid == root_uid)
1824 rv = setgid(real_gid);
1827 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1828 (long int)real_gid, strerror(errno));
1831 rv = setuid(real_uid);
1834 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1835 (long int)real_uid, strerror(errno));
1840 /* If neither the original real uid nor the original euid was root, Exim is
1841 running in an unprivileged state. */
1843 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1845 /* Scan the program's arguments. Some can be dealt with right away; others are
1846 simply recorded for checking and handling afterwards. Do a high-level switch
1847 on the second character (the one after '-'), to save some effort. */
1849 for (i = 1; i < argc; i++)
1851 BOOL badarg = FALSE;
1852 uschar *arg = argv[i];
1856 /* An argument not starting with '-' is the start of a recipients list;
1857 break out of the options-scanning loop. */
1865 /* An option consistion of -- terminates the options */
1867 if (Ustrcmp(arg, "--") == 0)
1869 recipients_arg = i + 1;
1873 /* Handle flagged options */
1875 switchchar = arg[1];
1878 /* Make all -ex options synonymous with -oex arguments, since that
1879 is assumed by various callers. Also make -qR options synonymous with -R
1880 options, as that seems to be required as well. Allow for -qqR too, and
1881 the same for -S options. */
1883 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1884 Ustrncmp(arg+1, "qR", 2) == 0 ||
1885 Ustrncmp(arg+1, "qS", 2) == 0)
1887 switchchar = arg[2];
1890 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1892 switchchar = arg[3];
1894 queue_2stage = TRUE;
1897 /* Make -r synonymous with -f, since it is a documented alias */
1899 else if (arg[1] == 'r') switchchar = 'f';
1901 /* Make -ov synonymous with -v */
1903 else if (Ustrcmp(arg, "-ov") == 0)
1909 /* deal with --option_aliases */
1910 else if (switchchar == '-')
1912 if (Ustrcmp(argrest, "help") == 0)
1914 usage_wanted = TRUE;
1917 else if (Ustrcmp(argrest, "version") == 0)
1924 /* High-level switch on active initial letter */
1929 /* sendmail uses -Ac and -Am to control which .cf file is used;
1932 if (*argrest == '\0') { badarg = TRUE; break; }
1935 BOOL ignore = FALSE;
1940 if (*(argrest + 1) == '\0')
1944 if (!ignore) { badarg = TRUE; break; }
1948 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1949 so has no need of it. */
1952 if (*argrest == 0) i++; /* Skip over the type */
1957 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1959 /* -bd: Run in daemon mode, awaiting SMTP connections.
1960 -bdf: Ditto, but in the foreground.
1963 if (*argrest == 'd')
1965 daemon_listen = TRUE;
1966 if (*(++argrest) == 'f') background_daemon = FALSE;
1967 else if (*argrest != 0) { badarg = TRUE; break; }
1970 /* -be: Run in expansion test mode
1971 -bem: Ditto, but read a message from a file first
1974 else if (*argrest == 'e')
1976 expansion_test = checking = TRUE;
1977 if (argrest[1] == 'm')
1979 if (++i >= argc) { badarg = TRUE; break; }
1980 expansion_test_message = argv[i];
1983 if (argrest[1] != 0) { badarg = TRUE; break; }
1986 /* -bF: Run system filter test */
1988 else if (*argrest == 'F')
1990 filter_test |= FTEST_SYSTEM;
1991 if (*(++argrest) != 0) { badarg = TRUE; break; }
1992 if (++i < argc) filter_test_sfile = argv[i]; else
1994 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1999 /* -bf: Run user filter test
2000 -bfd: Set domain for filter testing
2001 -bfl: Set local part for filter testing
2002 -bfp: Set prefix for filter testing
2003 -bfs: Set suffix for filter testing
2006 else if (*argrest == 'f')
2008 if (*(++argrest) == 0)
2010 filter_test |= FTEST_USER;
2011 if (++i < argc) filter_test_ufile = argv[i]; else
2013 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2021 fprintf(stderr, "exim: string expected after %s\n", arg);
2024 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2025 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2026 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2027 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2028 else { badarg = TRUE; break; }
2032 /* -bh: Host checking - an IP address must follow. */
2034 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2036 if (++i >= argc) { badarg = TRUE; break; }
2037 sender_host_address = argv[i];
2038 host_checking = checking = log_testing_mode = TRUE;
2039 host_checking_callout = argrest[1] == 'c';
2042 /* -bi: This option is used by sendmail to initialize *the* alias file,
2043 though it has the -oA option to specify a different file. Exim has no
2044 concept of *the* alias file, but since Sun's YP make script calls
2045 sendmail this way, some support must be provided. */
2047 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2049 /* -bI: provide information, of the type to follow after a colon.
2050 This is an Exim flag. */
2052 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2054 uschar *p = &argrest[2];
2055 info_flag = CMDINFO_HELP;
2058 if (strcmpic(p, CUS"sieve") == 0)
2060 info_flag = CMDINFO_SIEVE;
2063 else if (strcmpic(p, CUS"dscp") == 0)
2065 info_flag = CMDINFO_DSCP;
2068 else if (strcmpic(p, CUS"help") == 0)
2075 /* -bm: Accept and deliver message - the default option. Reinstate
2076 receiving_message, which got turned off for all -b options. */
2078 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2080 /* -bmalware: test the filename given for malware */
2082 else if (Ustrcmp(argrest, "malware") == 0)
2084 if (++i >= argc) { badarg = TRUE; break; }
2085 malware_test_file = argv[i];
2088 /* -bnq: For locally originating messages, do not qualify unqualified
2089 addresses. In the envelope, this causes errors; in header lines they
2092 else if (Ustrcmp(argrest, "nq") == 0)
2094 allow_unqualified_sender = FALSE;
2095 allow_unqualified_recipient = FALSE;
2098 /* -bpxx: List the contents of the mail queue, in various forms. If
2099 the option is -bpc, just a queue count is needed. Otherwise, if the
2100 first letter after p is r, then order is random. */
2102 else if (*argrest == 'p')
2104 if (*(++argrest) == 'c')
2107 if (*(++argrest) != 0) badarg = TRUE;
2111 if (*argrest == 'r')
2113 list_queue_option = 8;
2116 else list_queue_option = 0;
2120 /* -bp: List the contents of the mail queue, top-level only */
2122 if (*argrest == 0) {}
2124 /* -bpu: List the contents of the mail queue, top-level undelivered */
2126 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2128 /* -bpa: List the contents of the mail queue, including all delivered */
2130 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2132 /* Unknown after -bp[r] */
2142 /* -bP: List the configuration variables given as the address list.
2143 Force -v, so configuration errors get displayed. */
2145 else if (Ustrcmp(argrest, "P") == 0)
2147 list_options = TRUE;
2148 debug_selector |= D_v;
2149 debug_file = stderr;
2152 /* -brt: Test retry configuration lookup */
2154 else if (Ustrcmp(argrest, "rt") == 0)
2156 test_retry_arg = i + 1;
2160 /* -brw: Test rewrite configuration */
2162 else if (Ustrcmp(argrest, "rw") == 0)
2164 test_rewrite_arg = i + 1;
2168 /* -bS: Read SMTP commands on standard input, but produce no replies -
2169 all errors are reported by sending messages. */
2171 else if (Ustrcmp(argrest, "S") == 0)
2172 smtp_input = smtp_batched_input = receiving_message = TRUE;
2174 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2175 on standard output. */
2177 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2179 /* -bt: address testing mode */
2181 else if (Ustrcmp(argrest, "t") == 0)
2182 address_test_mode = checking = log_testing_mode = TRUE;
2184 /* -bv: verify addresses */
2186 else if (Ustrcmp(argrest, "v") == 0)
2187 verify_address_mode = checking = log_testing_mode = TRUE;
2189 /* -bvs: verify sender addresses */
2191 else if (Ustrcmp(argrest, "vs") == 0)
2193 verify_address_mode = checking = log_testing_mode = TRUE;
2194 verify_as_sender = TRUE;
2197 /* -bV: Print version string and support details */
2199 else if (Ustrcmp(argrest, "V") == 0)
2201 printf("Exim version %s #%s built %s\n", version_string,
2202 version_cnumber, version_date);
2203 printf("%s\n", CS version_copyright);
2204 version_printed = TRUE;
2205 show_whats_supported(stdout);
2208 /* -bw: inetd wait mode, accept a listening socket as stdin */
2210 else if (*argrest == 'w')
2212 inetd_wait_mode = TRUE;
2213 background_daemon = FALSE;
2214 daemon_listen = TRUE;
2215 if (*(++argrest) != '\0')
2217 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2218 if (inetd_wait_timeout <= 0)
2220 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2230 /* -C: change configuration file list; ignore if it isn't really
2231 a change! Enforce a prefix check if required. */
2236 if(++i < argc) argrest = argv[i]; else
2237 { badarg = TRUE; break; }
2239 if (Ustrcmp(config_main_filelist, argrest) != 0)
2241 #ifdef ALT_CONFIG_PREFIX
2243 int len = Ustrlen(ALT_CONFIG_PREFIX);
2244 uschar *list = argrest;
2246 while((filename = string_nextinlist(&list, &sep, big_buffer,
2247 big_buffer_size)) != NULL)
2249 if ((Ustrlen(filename) < len ||
2250 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2251 Ustrstr(filename, "/../") != NULL) &&
2252 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2254 fprintf(stderr, "-C Permission denied\n");
2259 if (real_uid != root_uid)
2261 #ifdef TRUSTED_CONFIG_LIST
2263 if (real_uid != exim_uid
2264 #ifdef CONFIGURE_OWNER
2265 && real_uid != config_uid
2268 trusted_config = FALSE;
2271 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2274 struct stat statbuf;
2276 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2277 (statbuf.st_uid != root_uid /* owner not root */
2278 #ifdef CONFIGURE_OWNER
2279 && statbuf.st_uid != config_uid /* owner not the special one */
2282 (statbuf.st_gid != root_gid /* group not root */
2283 #ifdef CONFIGURE_GROUP
2284 && statbuf.st_gid != config_gid /* group not the special one */
2286 && (statbuf.st_mode & 020) != 0 /* group writeable */
2288 (statbuf.st_mode & 2) != 0) /* world writeable */
2290 trusted_config = FALSE;
2295 /* Well, the trust list at least is up to scratch... */
2296 void *reset_point = store_get(0);
2297 uschar *trusted_configs[32];
2301 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2303 uschar *start = big_buffer, *nl;
2304 while (*start && isspace(*start))
2308 nl = Ustrchr(start, '\n');
2311 trusted_configs[nr_configs++] = string_copy(start);
2312 if (nr_configs == 32)
2320 const uschar *list = argrest;
2322 while (trusted_config && (filename = string_nextinlist(&list,
2323 &sep, big_buffer, big_buffer_size)) != NULL)
2325 for (i=0; i < nr_configs; i++)
2327 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2330 if (i == nr_configs)
2332 trusted_config = FALSE;
2336 store_reset(reset_point);
2340 /* No valid prefixes found in trust_list file. */
2341 trusted_config = FALSE;
2347 /* Could not open trust_list file. */
2348 trusted_config = FALSE;
2352 /* Not root; don't trust config */
2353 trusted_config = FALSE;
2357 config_main_filelist = argrest;
2358 config_changed = TRUE;
2363 /* -D: set up a macro definition */
2366 #ifdef DISABLE_D_OPTION
2367 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2372 macro_item *mlast = NULL;
2375 uschar *s = argrest;
2377 while (isspace(*s)) s++;
2379 if (*s < 'A' || *s > 'Z')
2381 fprintf(stderr, "exim: macro name set by -D must start with "
2382 "an upper case letter\n");
2386 while (isalnum(*s) || *s == '_')
2388 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2392 if (ptr == 0) { badarg = TRUE; break; }
2393 while (isspace(*s)) s++;
2396 if (*s++ != '=') { badarg = TRUE; break; }
2397 while (isspace(*s)) s++;
2400 for (m = macros; m != NULL; m = m->next)
2402 if (Ustrcmp(m->name, name) == 0)
2404 fprintf(stderr, "exim: duplicated -D in command line\n");
2410 m = store_get(sizeof(macro_item) + Ustrlen(name));
2412 m->command_line = TRUE;
2413 if (mlast == NULL) macros = m; else mlast->next = m;
2414 Ustrcpy(m->name, name);
2415 m->replacement = string_copy(s);
2417 if (clmacro_count >= MAX_CLMACROS)
2419 fprintf(stderr, "exim: too many -D options on command line\n");
2422 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2428 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2429 The latter is now a no-op, retained for compatibility only. If -dd is used,
2430 debugging subprocesses of the daemon is disabled. */
2433 if (Ustrcmp(argrest, "ropcr") == 0)
2435 /* drop_cr = TRUE; */
2438 /* Use an intermediate variable so that we don't set debugging while
2439 decoding the debugging bits. */
2443 unsigned int selector = D_default;
2446 if (*argrest == 'd')
2448 debug_daemon = TRUE;
2452 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2453 debug_options_count, US"debug", 0);
2454 debug_selector = selector;
2459 /* -E: This is a local error message. This option is not intended for
2460 external use at all, but is not restricted to trusted callers because it
2461 does no harm (just suppresses certain error messages) and if Exim is run
2462 not setuid root it won't always be trusted when it generates error
2463 messages using this option. If there is a message id following -E, point
2464 message_reference at it, for logging. */
2467 local_error_message = TRUE;
2468 if (mac_ismsgid(argrest)) message_reference = argrest;
2472 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2473 option, so it looks as if historically the -oex options are also callable
2474 without the leading -o. So we have to accept them. Before the switch,
2475 anything starting -oe has been converted to -e. Exim does not support all
2476 of the sendmail error options. */
2479 if (Ustrcmp(argrest, "e") == 0)
2481 arg_error_handling = ERRORS_SENDER;
2482 errors_sender_rc = EXIT_SUCCESS;
2484 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2485 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2486 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2487 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2492 /* -F: Set sender's full name, used instead of the gecos entry from
2493 the password file. Since users can usually alter their gecos entries,
2494 there's no security involved in using this instead. The data can follow
2495 the -F or be in the next argument. */
2500 if(++i < argc) argrest = argv[i]; else
2501 { badarg = TRUE; break; }
2503 originator_name = argrest;
2504 sender_name_forced = TRUE;
2508 /* -f: Set sender's address - this value is only actually used if Exim is
2509 run by a trusted user, or if untrusted_set_sender is set and matches the
2510 address, except that the null address can always be set by any user. The
2511 test for this happens later, when the value given here is ignored when not
2512 permitted. For an untrusted user, the actual sender is still put in Sender:
2513 if it doesn't match the From: header (unless no_local_from_check is set).
2514 The data can follow the -f or be in the next argument. The -r switch is an
2515 obsolete form of -f but since there appear to be programs out there that
2516 use anything that sendmail has ever supported, better accept it - the
2517 synonymizing is done before the switch above.
2519 At this stage, we must allow domain literal addresses, because we don't
2520 know what the setting of allow_domain_literals is yet. Ditto for trailing
2521 dots and strip_trailing_dot. */
2525 int dummy_start, dummy_end;
2529 if (i+1 < argc) argrest = argv[++i]; else
2530 { badarg = TRUE; break; }
2533 sender_address = string_sprintf(""); /* Ensure writeable memory */
2536 uschar *temp = argrest + Ustrlen(argrest) - 1;
2537 while (temp >= argrest && isspace(*temp)) temp--;
2538 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2539 allow_domain_literals = TRUE;
2540 strip_trailing_dot = TRUE;
2541 #ifdef EXPERIMENTAL_INTERNATIONAL
2542 allow_utf8_domains = TRUE;
2544 sender_address = parse_extract_address(argrest, &errmess,
2545 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2546 #ifdef EXPERIMENTAL_INTERNATIONAL
2547 message_smtputf8 = string_is_utf8(sender_address);
2548 allow_utf8_domains = FALSE;
2550 allow_domain_literals = FALSE;
2551 strip_trailing_dot = FALSE;
2552 if (sender_address == NULL)
2554 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2555 return EXIT_FAILURE;
2558 sender_address_forced = TRUE;
2562 /* -G: sendmail invocation to specify that it's a gateway submission and
2563 sendmail may complain about problems instead of fixing them.
2564 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2565 not at this time complain about problems. */
2571 /* -h: Set the hop count for an incoming message. Exim does not currently
2572 support this; it always computes it by counting the Received: headers.
2573 To put it in will require a change to the spool header file format. */
2578 if(++i < argc) argrest = argv[i]; else
2579 { badarg = TRUE; break; }
2581 if (!isdigit(*argrest)) badarg = TRUE;
2585 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2586 not to be documented for sendmail but mailx (at least) uses it) */
2589 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2593 /* -L: set the identifier used for syslog; equivalent to setting
2594 syslog_processname in the config file, but needs to be an admin option. */
2597 if (*argrest == '\0')
2599 if(++i < argc) argrest = argv[i]; else
2600 { badarg = TRUE; break; }
2602 sz = Ustrlen(argrest);
2605 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2606 return EXIT_FAILURE;
2610 fprintf(stderr, "exim: the -L syslog name is too short\n");
2611 return EXIT_FAILURE;
2613 cmdline_syslog_name = argrest;
2617 receiving_message = FALSE;
2619 /* -MC: continue delivery of another message via an existing open
2620 file descriptor. This option is used for an internal call by the
2621 smtp transport when there is a pending message waiting to go to an
2622 address to which it has got a connection. Five subsequent arguments are
2623 required: transport name, host name, IP address, sequence number, and
2624 message_id. Transports may decline to create new processes if the sequence
2625 number gets too big. The channel is stdin. This (-MC) must be the last
2626 argument. There's a subsequent check that the real-uid is privileged.
2628 If we are running in the test harness. delay for a bit, to let the process
2629 that set this one up complete. This makes for repeatability of the logging,
2632 if (Ustrcmp(argrest, "C") == 0)
2634 union sockaddr_46 interface_sock;
2635 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2639 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2640 return EXIT_FAILURE;
2643 if (msg_action_arg >= 0)
2645 fprintf(stderr, "exim: incompatible arguments\n");
2646 return EXIT_FAILURE;
2649 continue_transport = argv[++i];
2650 continue_hostname = argv[++i];
2651 continue_host_address = argv[++i];
2652 continue_sequence = Uatoi(argv[++i]);
2653 msg_action = MSG_DELIVER;
2654 msg_action_arg = ++i;
2655 forced_delivery = TRUE;
2656 queue_run_pid = passed_qr_pid;
2657 queue_run_pipe = passed_qr_pipe;
2659 if (!mac_ismsgid(argv[i]))
2661 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2663 return EXIT_FAILURE;
2666 /* Set up $sending_ip_address and $sending_port */
2668 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2670 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2674 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2676 return EXIT_FAILURE;
2679 if (running_in_test_harness) millisleep(500);
2683 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2684 precedes -MC (see above). The flag indicates that the host to which
2685 Exim is connected has accepted an AUTH sequence. */
2687 else if (Ustrcmp(argrest, "CA") == 0)
2689 smtp_authenticated = TRUE;
2693 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2694 that exim is connected to supports the esmtp extension DSN */
2695 else if (Ustrcmp(argrest, "CD") == 0)
2697 smtp_use_dsn = TRUE;
2701 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2702 it preceded -MC (see above) */
2704 else if (Ustrcmp(argrest, "CP") == 0)
2706 smtp_use_pipelining = TRUE;
2710 /* -MCQ: pass on the pid of the queue-running process that started
2711 this chain of deliveries and the fd of its synchronizing pipe; this
2712 is useful only when it precedes -MC (see above) */
2714 else if (Ustrcmp(argrest, "CQ") == 0)
2716 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2718 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2723 /* -MCS: set the smtp_use_size flag; this is useful only when it
2724 precedes -MC (see above) */
2726 else if (Ustrcmp(argrest, "CS") == 0)
2728 smtp_use_size = TRUE;
2732 /* -MCT: set the tls_offered flag; this is useful only when it
2733 precedes -MC (see above). The flag indicates that the host to which
2734 Exim is connected has offered TLS support. */
2737 else if (Ustrcmp(argrest, "CT") == 0)
2744 /* -M[x]: various operations on the following list of message ids:
2745 -M deliver the messages, ignoring next retry times and thawing
2746 -Mc deliver the messages, checking next retry times, no thawing
2747 -Mf freeze the messages
2748 -Mg give up on the messages
2749 -Mt thaw the messages
2750 -Mrm remove the messages
2751 In the above cases, this must be the last option. There are also the
2752 following options which are followed by a single message id, and which
2753 act on that message. Some of them use the "recipient" addresses as well.
2754 -Mar add recipient(s)
2755 -Mmad mark all recipients delivered
2756 -Mmd mark recipients(s) delivered
2758 -Mset load a message for use with -be
2760 -Mvc show copy (of whole message, in RFC 2822 format)
2765 else if (*argrest == 0)
2767 msg_action = MSG_DELIVER;
2768 forced_delivery = deliver_force_thaw = TRUE;
2770 else if (Ustrcmp(argrest, "ar") == 0)
2772 msg_action = MSG_ADD_RECIPIENT;
2773 one_msg_action = TRUE;
2775 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2776 else if (Ustrcmp(argrest, "es") == 0)
2778 msg_action = MSG_EDIT_SENDER;
2779 one_msg_action = TRUE;
2781 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2782 else if (Ustrcmp(argrest, "g") == 0)
2784 msg_action = MSG_DELIVER;
2785 deliver_give_up = TRUE;
2787 else if (Ustrcmp(argrest, "mad") == 0)
2789 msg_action = MSG_MARK_ALL_DELIVERED;
2791 else if (Ustrcmp(argrest, "md") == 0)
2793 msg_action = MSG_MARK_DELIVERED;
2794 one_msg_action = TRUE;
2796 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2797 else if (Ustrcmp(argrest, "set") == 0)
2799 msg_action = MSG_LOAD;
2800 one_msg_action = TRUE;
2802 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2803 else if (Ustrcmp(argrest, "vb") == 0)
2805 msg_action = MSG_SHOW_BODY;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "vc") == 0)
2810 msg_action = MSG_SHOW_COPY;
2811 one_msg_action = TRUE;
2813 else if (Ustrcmp(argrest, "vh") == 0)
2815 msg_action = MSG_SHOW_HEADER;
2816 one_msg_action = TRUE;
2818 else if (Ustrcmp(argrest, "vl") == 0)
2820 msg_action = MSG_SHOW_LOG;
2821 one_msg_action = TRUE;
2823 else { badarg = TRUE; break; }
2825 /* All the -Mxx options require at least one message id. */
2827 msg_action_arg = i + 1;
2828 if (msg_action_arg >= argc)
2830 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2831 return EXIT_FAILURE;
2834 /* Some require only message ids to follow */
2836 if (!one_msg_action)
2839 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2841 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2843 return EXIT_FAILURE;
2845 goto END_ARG; /* Remaining args are ids */
2848 /* Others require only one message id, possibly followed by addresses,
2849 which will be handled as normal arguments. */
2853 if (!mac_ismsgid(argv[msg_action_arg]))
2855 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2856 argv[msg_action_arg], arg);
2857 return EXIT_FAILURE;
2864 /* Some programs seem to call the -om option without the leading o;
2865 for sendmail it askes for "me too". Exim always does this. */
2868 if (*argrest != 0) badarg = TRUE;
2872 /* -N: don't do delivery - a debugging option that stops transports doing
2873 their thing. It implies debugging at the D_v level. */
2878 dont_deliver = TRUE;
2879 debug_selector |= D_v;
2880 debug_file = stderr;
2886 /* -n: This means "don't alias" in sendmail, apparently.
2887 For normal invocations, it has no effect.
2888 It may affect some other options. */
2894 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2895 option to the specified value. This form uses long names. We need to handle
2896 -O option=value and -Ooption=value. */
2903 fprintf(stderr, "exim: string expected after -O\n");
2911 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2914 if (*argrest == 'A')
2916 alias_arg = argrest + 1;
2917 if (alias_arg[0] == 0)
2919 if (i+1 < argc) alias_arg = argv[++i]; else
2921 fprintf(stderr, "exim: string expected after -oA\n");
2927 /* -oB: Set a connection message max value for remote deliveries */
2929 else if (*argrest == 'B')
2931 uschar *p = argrest + 1;
2934 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2936 connection_max_messages = 1;
2945 fprintf(stderr, "exim: number expected after -oB\n");
2948 connection_max_messages = Uatoi(p);
2952 /* -odb: background delivery */
2954 else if (Ustrcmp(argrest, "db") == 0)
2956 synchronous_delivery = FALSE;
2957 arg_queue_only = FALSE;
2958 queue_only_set = TRUE;
2961 /* -odf: foreground delivery (smail-compatible option); same effect as
2962 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2965 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2967 synchronous_delivery = TRUE;
2968 arg_queue_only = FALSE;
2969 queue_only_set = TRUE;
2972 /* -odq: queue only */
2974 else if (Ustrcmp(argrest, "dq") == 0)
2976 synchronous_delivery = FALSE;
2977 arg_queue_only = TRUE;
2978 queue_only_set = TRUE;
2981 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2982 but no remote delivery */
2984 else if (Ustrcmp(argrest, "dqs") == 0)
2987 arg_queue_only = FALSE;
2988 queue_only_set = TRUE;
2991 /* -oex: Sendmail error flags. As these are also accepted without the
2992 leading -o prefix, for compatibility with vacation and other callers,
2993 they are handled with -e above. */
2995 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2996 -oitrue: Another sendmail syntax for the same */
2998 else if (Ustrcmp(argrest, "i") == 0 ||
2999 Ustrcmp(argrest, "itrue") == 0)
3002 /* -oM*: Set various characteristics for an incoming message; actually
3003 acted on for trusted callers only. */
3005 else if (*argrest == 'M')
3009 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3013 /* -oMa: Set sender host address */
3015 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3017 /* -oMaa: Set authenticator name */
3019 else if (Ustrcmp(argrest, "Maa") == 0)
3020 sender_host_authenticated = argv[++i];
3022 /* -oMas: setting authenticated sender */
3024 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3026 /* -oMai: setting authenticated id */
3028 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3030 /* -oMi: Set incoming interface address */
3032 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3034 /* -oMm: Message reference */
3036 else if (Ustrcmp(argrest, "Mm") == 0)
3038 if (!mac_ismsgid(argv[i+1]))
3040 fprintf(stderr,"-oMm must be a valid message ID\n");
3043 if (!trusted_config)
3045 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3048 message_reference = argv[++i];
3051 /* -oMr: Received protocol */
3053 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3055 /* -oMs: Set sender host name */
3057 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3059 /* -oMt: Set sender ident */
3061 else if (Ustrcmp(argrest, "Mt") == 0)
3063 sender_ident_set = TRUE;
3064 sender_ident = argv[++i];
3067 /* Else a bad argument */
3076 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3077 seem to call this as -m (undocumented), so that is also accepted (see
3080 else if (Ustrcmp(argrest, "m") == 0) {}
3082 /* -oo: An ancient flag for old-style addresses which still seems to
3083 crop up in some calls (see in SCO). */
3085 else if (Ustrcmp(argrest, "o") == 0) {}
3087 /* -oP <name>: set pid file path for daemon */
3089 else if (Ustrcmp(argrest, "P") == 0)
3090 override_pid_file_path = argv[++i];
3092 /* -or <n>: set timeout for non-SMTP acceptance
3093 -os <n>: set timeout for SMTP acceptance */
3095 else if (*argrest == 'r' || *argrest == 's')
3097 int *tp = (*argrest == 'r')?
3098 &arg_receive_timeout : &arg_smtp_receive_timeout;
3099 if (argrest[1] == 0)
3101 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3103 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3106 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3111 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3113 else if (Ustrcmp(argrest, "X") == 0)
3114 override_local_interfaces = argv[++i];
3116 /* Unknown -o argument */
3122 /* -ps: force Perl startup; -pd force delayed Perl startup */
3126 if (*argrest == 's' && argrest[1] == 0)
3128 perl_start_option = 1;
3131 if (*argrest == 'd' && argrest[1] == 0)
3133 perl_start_option = -1;
3138 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3139 which sets the host protocol and host name */
3143 if (i+1 < argc) argrest = argv[++i]; else
3144 { badarg = TRUE; break; }
3149 uschar *hn = Ustrchr(argrest, ':');
3152 received_protocol = argrest;
3156 received_protocol = string_copyn(argrest, hn - argrest);
3157 sender_host_name = hn + 1;
3164 receiving_message = FALSE;
3165 if (queue_interval >= 0)
3167 fprintf(stderr, "exim: -q specified more than once\n");
3171 /* -qq...: Do queue runs in a 2-stage manner */
3173 if (*argrest == 'q')
3175 queue_2stage = TRUE;
3179 /* -qi...: Do only first (initial) deliveries */
3181 if (*argrest == 'i')
3183 queue_run_first_delivery = TRUE;
3187 /* -qf...: Run the queue, forcing deliveries
3188 -qff..: Ditto, forcing thawing as well */
3190 if (*argrest == 'f')
3192 queue_run_force = TRUE;
3193 if (*(++argrest) == 'f')
3195 deliver_force_thaw = TRUE;
3200 /* -q[f][f]l...: Run the queue only on local deliveries */
3202 if (*argrest == 'l')
3204 queue_run_local = TRUE;
3208 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3209 optionally starting from a given message id. */
3211 if (*argrest == 0 &&
3212 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3215 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3216 start_queue_run_id = argv[++i];
3217 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3218 stop_queue_run_id = argv[++i];
3221 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3222 optionally local only. */
3227 queue_interval = readconf_readtime(argrest, 0, FALSE);
3229 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3230 if (queue_interval <= 0)
3232 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3239 case 'R': /* Synonymous with -qR... */
3240 receiving_message = FALSE;
3242 /* -Rf: As -R (below) but force all deliveries,
3243 -Rff: Ditto, but also thaw all frozen messages,
3244 -Rr: String is regex
3245 -Rrf: Regex and force
3246 -Rrff: Regex and force and thaw
3248 in all cases provided there are no further characters in this
3254 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3256 if (Ustrcmp(argrest, rsopts[i]) == 0)
3258 if (i != 2) queue_run_force = TRUE;
3259 if (i >= 2) deliver_selectstring_regex = TRUE;
3260 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3261 argrest += Ustrlen(rsopts[i]);
3266 /* -R: Set string to match in addresses for forced queue run to
3267 pick out particular messages. */
3271 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3273 fprintf(stderr, "exim: string expected after -R\n");
3277 else deliver_selectstring = argrest;
3281 /* -r: an obsolete synonym for -f (see above) */
3284 /* -S: Like -R but works on sender. */
3286 case 'S': /* Synonymous with -qS... */
3287 receiving_message = FALSE;
3289 /* -Sf: As -S (below) but force all deliveries,
3290 -Sff: Ditto, but also thaw all frozen messages,
3291 -Sr: String is regex
3292 -Srf: Regex and force
3293 -Srff: Regex and force and thaw
3295 in all cases provided there are no further characters in this
3301 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3303 if (Ustrcmp(argrest, rsopts[i]) == 0)
3305 if (i != 2) queue_run_force = TRUE;
3306 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3307 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3308 argrest += Ustrlen(rsopts[i]);
3313 /* -S: Set string to match in addresses for forced queue run to
3314 pick out particular messages. */
3318 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3320 fprintf(stderr, "exim: string expected after -S\n");
3324 else deliver_selectstring_sender = argrest;
3327 /* -Tqt is an option that is exclusively for use by the testing suite.
3328 It is not recognized in other circumstances. It allows for the setting up
3329 of explicit "queue times" so that various warning/retry things can be
3330 tested. Otherwise variability of clock ticks etc. cause problems. */
3333 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3334 fudged_queue_times = argv[++i];
3339 /* -t: Set flag to extract recipients from body of message. */
3342 if (*argrest == 0) extract_recipients = TRUE;
3344 /* -ti: Set flag to extract recipients from body of message, and also
3345 specify that dot does not end the message. */
3347 else if (Ustrcmp(argrest, "i") == 0)
3349 extract_recipients = TRUE;
3353 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3356 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3363 /* -U: This means "initial user submission" in sendmail, apparently. The
3364 doc claims that in future sendmail may refuse syntactically invalid
3365 messages instead of fixing them. For the moment, we just ignore it. */
3371 /* -v: verify things - this is a very low-level debugging */
3376 debug_selector |= D_v;
3377 debug_file = stderr;
3383 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3385 The -x flag tells the sendmail command that mail from a local
3386 mail program has National Language Support (NLS) extended characters
3387 in the body of the mail item. The sendmail command can send mail with
3388 extended NLS characters across networks that normally corrupts these
3391 As Exim is 8-bit clean, it just ignores this flag. */
3394 if (*argrest != 0) badarg = TRUE;
3397 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3398 logs to that file. We swallow the parameter and otherwise ignore it. */
3401 if (*argrest == '\0')
3404 fprintf(stderr, "exim: string expected after -X\n");
3410 if (*argrest == '\0')
3411 if (++i < argc) log_oneline = argv[i]; else
3413 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3418 /* All other initial characters are errors */
3423 } /* End of high-level switch statement */
3425 /* Failed to recognize the option, or syntax error */
3429 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3430 "option %s\n", arg);
3436 /* If -R or -S have been specified without -q, assume a single queue run. */
3438 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3439 queue_interval < 0) queue_interval = 0;
3443 /* If usage_wanted is set we call the usage function - which never returns */
3444 if (usage_wanted) exim_usage(called_as);
3446 /* Arguments have been processed. Check for incompatibilities. */
3448 (smtp_input || extract_recipients || recipients_arg < argc) &&
3449 (daemon_listen || queue_interval >= 0 || bi_option ||
3450 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3451 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3454 msg_action_arg > 0 &&
3455 (daemon_listen || queue_interval >= 0 || list_options ||
3456 (checking && msg_action != MSG_LOAD) ||
3457 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3460 (daemon_listen || queue_interval >= 0) &&
3461 (sender_address != NULL || list_options || list_queue || checking ||
3465 daemon_listen && queue_interval == 0
3468 inetd_wait_mode && queue_interval >= 0
3472 (checking || smtp_input || extract_recipients ||
3473 filter_test != FTEST_NONE || bi_option)
3476 verify_address_mode &&
3477 (address_test_mode || smtp_input || extract_recipients ||
3478 filter_test != FTEST_NONE || bi_option)
3481 address_test_mode && (smtp_input || extract_recipients ||
3482 filter_test != FTEST_NONE || bi_option)
3485 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3489 deliver_selectstring != NULL && queue_interval < 0
3492 msg_action == MSG_LOAD &&
3493 (!expansion_test || expansion_test_message != NULL)
3497 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3501 /* If debugging is set up, set the file and the file descriptor to pass on to
3502 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3503 to run in the foreground. */
3505 if (debug_selector != 0)
3507 debug_file = stderr;
3508 debug_fd = fileno(debug_file);
3509 background_daemon = FALSE;
3510 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3511 if (debug_selector != D_v) /* -v only doesn't show this */
3513 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3514 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3516 if (!version_printed)
3517 show_whats_supported(stderr);
3521 /* When started with root privilege, ensure that the limits on the number of
3522 open files and the number of processes (where that is accessible) are
3523 sufficiently large, or are unset, in case Exim has been called from an
3524 environment where the limits are screwed down. Not all OS have the ability to
3525 change some of these limits. */
3529 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3535 #ifdef RLIMIT_NOFILE
3536 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3538 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3540 rlp.rlim_cur = rlp.rlim_max = 0;
3543 /* I originally chose 1000 as a nice big number that was unlikely to
3544 be exceeded. It turns out that some older OS have a fixed upper limit of
3547 if (rlp.rlim_cur < 1000)
3549 rlp.rlim_cur = rlp.rlim_max = 1000;
3550 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3552 rlp.rlim_cur = rlp.rlim_max = 256;
3553 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3554 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3561 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3563 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3565 rlp.rlim_cur = rlp.rlim_max = 0;
3568 #ifdef RLIM_INFINITY
3569 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3571 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3573 if (rlp.rlim_cur < 1000)
3575 rlp.rlim_cur = rlp.rlim_max = 1000;
3577 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3578 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3584 /* Exim is normally entered as root (but some special configurations are
3585 possible that don't do this). However, it always spins off sub-processes that
3586 set their uid and gid as required for local delivery. We don't want to pass on
3587 any extra groups that root may belong to, so we want to get rid of them all at
3590 We need to obey setgroups() at this stage, before possibly giving up root
3591 privilege for a changed configuration file, but later on we might need to
3592 check on the additional groups for the admin user privilege - can't do that
3593 till after reading the config, which might specify the exim gid. Therefore,
3594 save the group list here first. */
3596 group_count = getgroups(NGROUPS_MAX, group_list);
3597 if (group_count < 0)
3599 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3603 /* There is a fundamental difference in some BSD systems in the matter of
3604 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3605 known not to be different. On the "different" systems there is a single group
3606 list, and the first entry in it is the current group. On all other versions of
3607 Unix there is a supplementary group list, which is in *addition* to the current
3608 group. Consequently, to get rid of all extraneous groups on a "standard" system
3609 you pass over 0 groups to setgroups(), while on a "different" system you pass
3610 over a single group - the current group, which is always the first group in the
3611 list. Calling setgroups() with zero groups on a "different" system results in
3612 an error return. The following code should cope with both types of system.
3614 However, if this process isn't running as root, setgroups() can't be used
3615 since you have to be root to run it, even if throwing away groups. Not being
3616 root here happens only in some unusual configurations. We just ignore the
3619 if (setgroups(0, NULL) != 0)
3621 if (setgroups(1, group_list) != 0 && !unprivileged)
3623 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3628 /* If the configuration file name has been altered by an argument on the
3629 command line (either a new file name or a macro definition) and the caller is
3630 not root, or if this is a filter testing run, remove any setuid privilege the
3631 program has and run as the underlying user.
3633 The exim user is locked out of this, which severely restricts the use of -C
3636 Otherwise, set the real ids to the effective values (should be root unless run
3637 from inetd, which it can either be root or the exim uid, if one is configured).
3639 There is a private mechanism for bypassing some of this, in order to make it
3640 possible to test lots of configurations automatically, without having either to
3641 recompile each time, or to patch in an actual configuration file name and other
3642 values (such as the path name). If running in the test harness, pretend that
3643 configuration file changes and macro definitions haven't happened. */
3646 (!trusted_config || /* Config changed, or */
3647 !macros_trusted()) && /* impermissible macros and */
3648 real_uid != root_uid && /* Not root, and */
3649 !running_in_test_harness /* Not fudged */
3651 expansion_test /* expansion testing */
3653 filter_test != FTEST_NONE) /* Filter testing */
3655 setgroups(group_count, group_list);
3656 exim_setugid(real_uid, real_gid, FALSE,
3657 US"-C, -D, -be or -bf forces real uid");
3658 removed_privilege = TRUE;
3660 /* In the normal case when Exim is called like this, stderr is available
3661 and should be used for any logging information because attempts to write
3662 to the log will usually fail. To arrange this, we unset really_exim. However,
3663 if no stderr is available there is no point - we might as well have a go
3664 at the log (if it fails, syslog will be written).
3666 Note that if the invoker is Exim, the logs remain available. Messing with
3667 this causes unlogged successful deliveries. */
3669 if ((log_stderr != NULL) && (real_uid != exim_uid))
3670 really_exim = FALSE;
3673 /* Privilege is to be retained for the moment. It may be dropped later,
3674 depending on the job that this Exim process has been asked to do. For now, set
3675 the real uid to the effective so that subsequent re-execs of Exim are done by a
3678 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3680 /* If testing a filter, open the file(s) now, before wasting time doing other
3681 setups and reading the message. */
3683 if ((filter_test & FTEST_SYSTEM) != 0)
3685 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3688 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3690 return EXIT_FAILURE;
3694 if ((filter_test & FTEST_USER) != 0)
3696 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3699 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3701 return EXIT_FAILURE;
3705 /* Initialise lookup_list
3706 If debugging, already called above via version reporting.
3707 In either case, we initialise the list of available lookups while running
3708 as root. All dynamically modules are loaded from a directory which is
3709 hard-coded into the binary and is code which, if not a module, would be
3710 part of Exim already. Ability to modify the content of the directory
3711 is equivalent to the ability to modify a setuid binary!
3713 This needs to happen before we read the main configuration. */
3716 #ifdef EXPERIMENTAL_INTERNATIONAL
3717 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3720 /* Read the main runtime configuration data; this gives up if there
3721 is a failure. It leaves the configuration file open so that the subsequent
3722 configuration data for delivery can be read if needed. */
3726 /* If an action on specific messages is requested, or if a daemon or queue
3727 runner is being started, we need to know if Exim was called by an admin user.
3728 This is the case if the real user is root or exim, or if the real group is
3729 exim, or if one of the supplementary groups is exim or a group listed in
3730 admin_groups. We don't fail all message actions immediately if not admin_user,
3731 since some actions can be performed by non-admin users. Instead, set admin_user
3732 for later interrogation. */
3734 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3739 for (i = 0; i < group_count; i++)
3741 if (group_list[i] == exim_gid) admin_user = TRUE;
3742 else if (admin_groups != NULL)
3744 for (j = 1; j <= (int)(admin_groups[0]); j++)
3745 if (admin_groups[j] == group_list[i])
3746 { admin_user = TRUE; break; }
3748 if (admin_user) break;
3752 /* Another group of privileged users are the trusted users. These are root,
3753 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3754 are permitted to specify sender_addresses with -f on the command line, and
3755 other message parameters as well. */
3757 if (real_uid == root_uid || real_uid == exim_uid)
3758 trusted_caller = TRUE;
3763 if (trusted_users != NULL)
3765 for (i = 1; i <= (int)(trusted_users[0]); i++)
3766 if (trusted_users[i] == real_uid)
3767 { trusted_caller = TRUE; break; }
3770 if (!trusted_caller && trusted_groups != NULL)
3772 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3774 if (trusted_groups[i] == real_gid)
3775 trusted_caller = TRUE;
3776 else for (j = 0; j < group_count; j++)
3778 if (trusted_groups[i] == group_list[j])
3779 { trusted_caller = TRUE; break; }
3781 if (trusted_caller) break;
3786 /* Handle the decoding of logging options. */
3788 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3789 log_selector_string, log_options, log_options_count, US"log", 0);
3793 debug_printf("configuration file is %s\n", config_main_filename);
3794 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3795 log_extra_selector);
3798 /* If domain literals are not allowed, check the sender address that was
3799 supplied with -f. Ditto for a stripped trailing dot. */
3801 if (sender_address != NULL)
3803 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3805 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3806 "allowed\n", sender_address);
3807 return EXIT_FAILURE;
3809 if (f_end_dot && !strip_trailing_dot)
3811 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3812 "(trailing dot not allowed)\n", sender_address);
3813 return EXIT_FAILURE;
3817 /* See if an admin user overrode our logging. */
3819 if (cmdline_syslog_name != NULL)
3823 syslog_processname = cmdline_syslog_name;
3824 log_file_path = string_copy(CUS"syslog");
3828 /* not a panic, non-privileged users should not be able to spam paniclog */
3830 "exim: you lack sufficient privilege to specify syslog process name\n");
3831 return EXIT_FAILURE;
3835 /* Paranoia check of maximum lengths of certain strings. There is a check
3836 on the length of the log file path in log.c, which will come into effect
3837 if there are any calls to write the log earlier than this. However, if we
3838 get this far but the string is very long, it is better to stop now than to
3839 carry on and (e.g.) receive a message and then have to collapse. The call to
3840 log_write() from here will cause the ultimate panic collapse if the complete
3841 file name exceeds the buffer length. */
3843 if (Ustrlen(log_file_path) > 200)
3844 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3845 "log_file_path is longer than 200 chars: aborting");
3847 if (Ustrlen(pid_file_path) > 200)
3848 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3849 "pid_file_path is longer than 200 chars: aborting");
3851 if (Ustrlen(spool_directory) > 200)
3852 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3853 "spool_directory is longer than 200 chars: aborting");
3855 /* Length check on the process name given to syslog for its TAG field,
3856 which is only permitted to be 32 characters or less. See RFC 3164. */
3858 if (Ustrlen(syslog_processname) > 32)
3859 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3860 "syslog_processname is longer than 32 chars: aborting");
3866 log_write(0, LOG_MAIN, "%s", log_oneline);
3867 return EXIT_SUCCESS;
3870 return EXIT_FAILURE;
3873 /* In some operating systems, the environment variable TMPDIR controls where
3874 temporary files are created; Exim doesn't use these (apart from when delivering
3875 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3876 If TMPDIR is found in the environment, reset it to the value defined in the
3877 TMPDIR macro, if this macro is defined. */
3882 for (p = USS environ; *p != NULL; p++)
3884 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3885 Ustrcmp(*p+7, TMPDIR) != 0)
3887 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3888 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3890 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3896 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3897 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3898 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3899 called by a user who has set the TZ variable. This then affects the timestamps
3900 in log files and in Received: headers, and any created Date: header lines. The
3901 required timezone is settable in the configuration file, so nothing can be done
3902 about this earlier - but hopefully nothing will normally be logged earlier than
3903 this. We have to make a new environment if TZ is wrong, but don't bother if
3904 timestamps_utc is set, because then all times are in UTC anyway. */
3906 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3908 timestamps_utc = TRUE;
3912 uschar *envtz = US getenv("TZ");
3913 if ((envtz == NULL && timezone_string != NULL) ||
3915 (timezone_string == NULL ||
3916 Ustrcmp(timezone_string, envtz) != 0)))
3918 uschar **p = USS environ;
3922 while (*p++ != NULL) count++;
3923 if (envtz == NULL) count++;
3924 newp = new = malloc(sizeof(uschar *) * (count + 1));
3925 for (p = USS environ; *p != NULL; p++)
3927 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3930 if (timezone_string != NULL)
3932 *newp = malloc(Ustrlen(timezone_string) + 4);
3933 sprintf(CS *newp++, "TZ=%s", timezone_string);
3938 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3939 tod_stamp(tod_log));
3943 /* Handle the case when we have removed the setuid privilege because of -C or
3944 -D. This means that the caller of Exim was not root.
3946 There is a problem if we were running as the Exim user. The sysadmin may
3947 expect this case to retain privilege because "the binary was called by the
3948 Exim user", but it hasn't, because either the -D option set macros, or the
3949 -C option set a non-trusted configuration file. There are two possibilities:
3951 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3952 to do message deliveries. Thus, the fact that it is running as a
3953 non-privileged user is plausible, and might be wanted in some special
3954 configurations. However, really_exim will have been set false when
3955 privilege was dropped, to stop Exim trying to write to its normal log
3956 files. Therefore, re-enable normal log processing, assuming the sysadmin
3957 has set up the log directory correctly.
3959 (2) If deliver_drop_privilege is not set, the configuration won't work as
3960 apparently intended, and so we log a panic message. In order to retain
3961 root for -C or -D, the caller must either be root or be invoking a
3962 trusted configuration file (when deliver_drop_privilege is false). */
3964 if (removed_privilege && (!trusted_config || macros != NULL) &&
3965 real_uid == exim_uid)
3967 if (deliver_drop_privilege)
3968 really_exim = TRUE; /* let logging work normally */
3970 log_write(0, LOG_MAIN|LOG_PANIC,
3971 "exim user lost privilege for using %s option",
3972 trusted_config? "-D" : "-C");
3975 /* Start up Perl interpreter if Perl support is configured and there is a
3976 perl_startup option, and the configuration or the command line specifies
3977 initializing starting. Note that the global variables are actually called
3978 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3981 if (perl_start_option != 0)
3982 opt_perl_at_start = (perl_start_option > 0);
3983 if (opt_perl_at_start && opt_perl_startup != NULL)
3986 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3987 errstr = init_perl(opt_perl_startup);
3990 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3991 return EXIT_FAILURE;
3993 opt_perl_started = TRUE;
3995 #endif /* EXIM_PERL */
3997 /* Log the arguments of the call if the configuration file said so. This is
3998 a debugging feature for finding out what arguments certain MUAs actually use.
3999 Don't attempt it if logging is disabled, or if listing variables or if
4000 verifying/testing addresses or expansions. */
4002 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
4003 && really_exim && !list_options && !checking)
4006 uschar *p = big_buffer;
4008 Ustrcpy(p, "cwd= (failed)");
4009 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4011 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4013 for (i = 0; i < argc; i++)
4015 int len = Ustrlen(argv[i]);
4016 const uschar *printing;
4018 if (p + len + 8 >= big_buffer + big_buffer_size)
4021 log_write(0, LOG_MAIN, "%s", big_buffer);
4022 Ustrcpy(big_buffer, "...");
4025 printing = string_printing(argv[i]);
4026 if (printing[0] == 0) quote = US"\""; else
4028 const uschar *pp = printing;
4030 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4032 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4033 (p - big_buffer) - 4), printing, quote);
4037 if ((log_extra_selector & LX_arguments) != 0)
4038 log_write(0, LOG_MAIN, "%s", big_buffer);
4040 debug_printf("%s\n", big_buffer);
4043 /* Set the working directory to be the top-level spool directory. We don't rely
4044 on this in the code, which always uses fully qualified names, but it's useful
4045 for core dumps etc. Don't complain if it fails - the spool directory might not
4046 be generally accessible and calls with the -C option (and others) have lost
4047 privilege by now. Before the chdir, we try to ensure that the directory exists.
4050 if (Uchdir(spool_directory) != 0)
4053 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4054 dummy = /* quieten compiler */ Uchdir(spool_directory);
4057 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4058 alias file. Exim doesn't have such a concept, but this call is screwed into
4059 Sun's YP makefiles. Handle this by calling a configured script, as the real
4060 user who called Exim. The -oA option can be used to pass an argument to the
4065 (void)fclose(config_file);
4066 if (bi_command != NULL)
4070 argv[i++] = bi_command;
4071 if (alias_arg != NULL) argv[i++] = alias_arg;
4074 setgroups(group_count, group_list);
4075 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4077 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4078 (argv[1] == NULL)? US"" : argv[1]);
4080 execv(CS argv[0], (char *const *)argv);
4081 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4086 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4091 /* We moved the admin/trusted check to be immediately after reading the
4092 configuration file. We leave these prints here to ensure that syslog setup,
4093 logfile setup, and so on has already happened. */
4095 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4096 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4098 /* Only an admin user may start the daemon or force a queue run in the default
4099 configuration, but the queue run restriction can be relaxed. Only an admin
4100 user may request that a message be returned to its sender forthwith. Only an
4101 admin user may specify a debug level greater than D_v (because it might show
4102 passwords, etc. in lookup queries). Only an admin user may request a queue
4103 count. Only an admin user can use the test interface to scan for email
4104 (because Exim will be in the spool dir and able to look at mails). */
4108 BOOL debugset = (debug_selector & ~D_v) != 0;
4109 if (deliver_give_up || daemon_listen || malware_test_file ||
4110 (count_queue && queue_list_requires_admin) ||
4111 (list_queue && queue_list_requires_admin) ||
4112 (queue_interval >= 0 && prod_requires_admin) ||
4113 (debugset && !running_in_test_harness))
4115 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4120 /* If the real user is not root or the exim uid, the argument for passing
4121 in an open TCP/IP connection for another message is not permitted, nor is
4122 running with the -N option for any delivery action, unless this call to exim is
4123 one that supplied an input message, or we are using a patched exim for
4124 regression testing. */
4126 if (real_uid != root_uid && real_uid != exim_uid &&
4127 (continue_hostname != NULL ||
4129 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4130 )) && !running_in_test_harness)
4132 fprintf(stderr, "exim: Permission denied\n");
4133 return EXIT_FAILURE;
4136 /* If the caller is not trusted, certain arguments are ignored when running for
4137 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4138 Note that authority for performing certain actions on messages is tested in the
4139 queue_action() function. */
4141 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4143 sender_host_name = sender_host_address = interface_address =
4144 sender_ident = received_protocol = NULL;
4145 sender_host_port = interface_port = 0;
4146 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4149 /* If a sender host address is set, extract the optional port number off the
4150 end of it and check its syntax. Do the same thing for the interface address.
4151 Exim exits if the syntax is bad. */
4155 if (sender_host_address != NULL)
4156 sender_host_port = check_port(sender_host_address);
4157 if (interface_address != NULL)
4158 interface_port = check_port(interface_address);
4161 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4166 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4167 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4171 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4172 return EXIT_FAILURE;
4176 /* If an SMTP message is being received check to see if the standard input is a
4177 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4178 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4183 union sockaddr_46 inetd_sock;
4184 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4185 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4187 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4188 if (family == AF_INET || family == AF_INET6)
4190 union sockaddr_46 interface_sock;
4191 size = sizeof(interface_sock);
4193 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4194 interface_address = host_ntoa(-1, &interface_sock, NULL,
4197 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4199 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4202 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4203 NULL, &sender_host_port);
4204 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4205 "inetd is not supported when mua_wrapper is set");
4210 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4211 return EXIT_FAILURE;
4217 /* If the load average is going to be needed while receiving a message, get it
4218 now for those OS that require the first call to os_getloadavg() to be done as
4219 root. There will be further calls later for each message received. */
4221 #ifdef LOAD_AVG_NEEDS_ROOT
4222 if (receiving_message &&
4223 (queue_only_load >= 0 ||
4224 (is_inetd && smtp_load_reserve >= 0)
4227 load_average = OS_GETLOADAVG();
4231 /* The queue_only configuration option can be overridden by -odx on the command
4232 line, except that if queue_only_override is false, queue_only cannot be unset
4233 from the command line. */
4235 if (queue_only_set && (queue_only_override || arg_queue_only))
4236 queue_only = arg_queue_only;
4238 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4241 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4242 if (arg_smtp_receive_timeout >= 0)
4243 smtp_receive_timeout = arg_smtp_receive_timeout;
4245 /* If Exim was started with root privilege, unless we have already removed the
4246 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4247 except when starting the daemon or doing some kind of delivery or address
4248 testing (-bt). These are the only cases when root need to be retained. We run
4249 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4250 retained only for starting the daemon. We always do the initgroups() in this
4251 situation (controlled by the TRUE below), in order to be as close as possible
4252 to the state Exim usually runs in. */
4254 if (!unprivileged && /* originally had root AND */
4255 !removed_privilege && /* still got root AND */
4256 !daemon_listen && /* not starting the daemon */
4257 queue_interval <= 0 && /* (either kind of daemon) */
4259 deliver_drop_privilege || /* requested unprivileged */
4261 queue_interval < 0 && /* not running the queue */
4262 (msg_action_arg < 0 || /* and */
4263 msg_action != MSG_DELIVER) && /* not delivering and */
4264 (!checking || !address_test_mode) /* not address checking */
4268 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4271 /* When we are retaining a privileged uid, we still change to the exim gid. */
4276 rv = setgid(exim_gid);
4277 /* Impact of failure is that some stuff might end up with an incorrect group.
4278 We track this for failures from root, since any attempt to change privilege
4279 by root should succeed and failures should be examined. For non-root,
4280 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4281 no need to complain then. */
4284 if (!(unprivileged || removed_privilege))
4287 "exim: changing group failed: %s\n", strerror(errno));
4291 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4292 (long int)exim_gid, strerror(errno));
4296 /* Handle a request to scan a file for malware */
4297 if (malware_test_file)
4299 #ifdef WITH_CONTENT_SCAN
4301 set_process_info("scanning file for malware");
4302 result = malware_in_file(malware_test_file);
4305 printf("No malware found.\n");
4310 printf("Malware lookup returned non-okay/fail: %d\n", result);
4314 printf("Malware found: %s\n", malware_name);
4316 printf("Malware scan detected malware of unknown name.\n");
4318 printf("Malware scanning not enabled at compile time.\n");
4323 /* Handle a request to list the delivery queue */
4327 set_process_info("listing the queue");
4328 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4332 /* Handle a request to count the delivery queue */
4336 set_process_info("counting the queue");
4341 /* Handle actions on specific messages, except for the force delivery and
4342 message load actions, which are done below. Some actions take a whole list of
4343 message ids, which are known to continue up to the end of the arguments. Others
4344 take a single message id and then operate on the recipients list. */
4346 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4348 int yield = EXIT_SUCCESS;
4349 set_process_info("acting on specified messages");
4351 if (!one_msg_action)
4353 for (i = msg_action_arg; i < argc; i++)
4354 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4355 yield = EXIT_FAILURE;
4358 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4359 recipients_arg)) yield = EXIT_FAILURE;
4363 /* We used to set up here to skip reading the ACL section, on
4364 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4365 Now, since the intro of the ${acl } expansion, ACL definitions may be
4366 needed in transports so we lost the optimisation. */
4370 /* The configuration data will have been read into POOL_PERM because we won't
4371 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4372 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4373 configuration were read into POOL_MAIN, because we don't do any resets till
4374 later on. However, it seems right, and it does ensure that both pools get used.
4377 store_pool = POOL_MAIN;
4379 /* Handle the -brt option. This is for checking out retry configurations.
4380 The next three arguments are a domain name or a complete address, and
4381 optionally two error numbers. All it does is to call the function that
4382 scans the retry configuration data. */
4384 if (test_retry_arg >= 0)
4386 retry_config *yield;
4387 int basic_errno = 0;
4391 if (test_retry_arg >= argc)
4393 printf("-brt needs a domain or address argument\n");
4394 exim_exit(EXIT_FAILURE);
4396 s1 = argv[test_retry_arg++];
4399 /* If the first argument contains no @ and no . it might be a local user
4400 or it might be a single-component name. Treat as a domain. */
4402 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4404 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4405 "being \ntreated as a one-component domain, not as a local part.\n\n",
4409 /* There may be an optional second domain arg. */
4411 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4412 s2 = argv[test_retry_arg++];
4414 /* The final arg is an error name */
4416 if (test_retry_arg < argc)
4418 uschar *ss = argv[test_retry_arg];
4420 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4423 printf("%s\n", CS error);
4424 return EXIT_FAILURE;
4427 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4428 code > 100 as an error is for matching codes to the decade. Turn them into
4429 a real error code, off the decade. */
4431 if (basic_errno == ERRNO_MAIL4XX ||
4432 basic_errno == ERRNO_RCPT4XX ||
4433 basic_errno == ERRNO_DATA4XX)
4435 int code = (more_errno >> 8) & 255;
4437 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4438 else if (code > 100)
4439 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4443 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4444 if (yield == NULL) printf("No retry information found\n"); else
4447 more_errno = yield->more_errno;
4448 printf("Retry rule: %s ", yield->pattern);
4450 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4452 printf("quota%s%s ",
4453 (more_errno > 0)? "_" : "",
4454 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4456 else if (yield->basic_errno == ECONNREFUSED)
4458 printf("refused%s%s ",
4459 (more_errno > 0)? "_" : "",
4460 (more_errno == 'M')? "MX" :
4461 (more_errno == 'A')? "A" : "");
4463 else if (yield->basic_errno == ETIMEDOUT)
4466 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4468 if (more_errno != 0) printf("_%s",
4469 (more_errno == 'M')? "MX" : "A");
4472 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4473 printf("auth_failed ");
4476 for (r = yield->rules; r != NULL; r = r->next)
4478 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4479 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4485 printf(",%d.", x/1000);
4499 exim_exit(EXIT_SUCCESS);
4502 /* Handle a request to list one or more configuration options */
4503 /* If -n was set, we suppress some information */
4507 set_process_info("listing variables");
4508 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4509 else for (i = recipients_arg; i < argc; i++)
4512 (Ustrcmp(argv[i], "router") == 0 ||
4513 Ustrcmp(argv[i], "transport") == 0 ||
4514 Ustrcmp(argv[i], "authenticator") == 0 ||
4515 Ustrcmp(argv[i], "macro") == 0))
4517 readconf_print(argv[i+1], argv[i], flag_n);
4520 else readconf_print(argv[i], NULL, flag_n);
4522 exim_exit(EXIT_SUCCESS);
4526 /* Handle a request to deliver one or more messages that are already on the
4527 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4528 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4530 Delivery of specific messages is typically used for a small number when
4531 prodding by hand (when the option forced_delivery will be set) or when
4532 re-execing to regain root privilege. Each message delivery must happen in a
4533 separate process, so we fork a process for each one, and run them sequentially
4534 so that debugging output doesn't get intertwined, and to avoid spawning too
4535 many processes if a long list is given. However, don't fork for the last one;
4536 this saves a process in the common case when Exim is called to deliver just one
4539 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4541 if (prod_requires_admin && !admin_user)
4543 fprintf(stderr, "exim: Permission denied\n");
4544 exim_exit(EXIT_FAILURE);
4546 set_process_info("delivering specified messages");
4547 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4548 for (i = msg_action_arg; i < argc; i++)
4553 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4554 else if ((pid = fork()) == 0)
4556 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4557 _exit(EXIT_SUCCESS);
4561 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4563 exim_exit(EXIT_FAILURE);
4567 exim_exit(EXIT_SUCCESS);
4571 /* If only a single queue run is requested, without SMTP listening, we can just
4572 turn into a queue runner, with an optional starting message id. */
4574 if (queue_interval == 0 && !daemon_listen)
4576 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4577 (start_queue_run_id == NULL)? US"" : US" starting at ",
4578 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4579 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4580 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4581 set_process_info("running the queue (single queue run)");
4582 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4583 exim_exit(EXIT_SUCCESS);
4587 /* Find the login name of the real user running this process. This is always
4588 needed when receiving a message, because it is written into the spool file. It
4589 may also be used to construct a from: or a sender: header, and in this case we
4590 need the user's full name as well, so save a copy of it, checked for RFC822
4591 syntax and munged if necessary, if it hasn't previously been set by the -F
4592 argument. We may try to get the passwd entry more than once, in case NIS or
4593 other delays are in evidence. Save the home directory for use in filter testing
4598 if ((pw = getpwuid(real_uid)) != NULL)
4600 originator_login = string_copy(US pw->pw_name);
4601 originator_home = string_copy(US pw->pw_dir);
4603 /* If user name has not been set by -F, set it from the passwd entry
4604 unless -f has been used to set the sender address by a trusted user. */
4606 if (originator_name == NULL)
4608 if (sender_address == NULL ||
4609 (!trusted_caller && filter_test == FTEST_NONE))
4611 uschar *name = US pw->pw_gecos;
4612 uschar *amp = Ustrchr(name, '&');
4615 /* Most Unix specify that a '&' character in the gecos field is
4616 replaced by a copy of the login name, and some even specify that
4617 the first character should be upper cased, so that's what we do. */
4622 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4623 amp - name, name, &loffset, originator_login, amp + 1);
4624 buffer[loffset] = toupper(buffer[loffset]);
4628 /* If a pattern for matching the gecos field was supplied, apply
4629 it and then expand the name string. */
4631 if (gecos_pattern != NULL && gecos_name != NULL)
4634 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4636 if (regex_match_and_setup(re, name, 0, -1))
4638 uschar *new_name = expand_string(gecos_name);
4640 if (new_name != NULL)
4642 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4643 "gecos field \"%s\"\n", new_name, name);
4646 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4647 "\"%s\": %s\n", gecos_name, expand_string_message);
4649 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4650 "gecos field \"%s\"\n", gecos_pattern, name);
4651 store_free((void *)re);
4653 originator_name = string_copy(name);
4656 /* A trusted caller has used -f but not -F */
4658 else originator_name = US"";
4661 /* Break the retry loop */
4666 if (++i > finduser_retries) break;
4670 /* If we cannot get a user login, log the incident and give up, unless the
4671 configuration specifies something to use. When running in the test harness,
4672 any setting of unknown_login overrides the actual name. */
4674 if (originator_login == NULL || running_in_test_harness)
4676 if (unknown_login != NULL)
4678 originator_login = expand_string(unknown_login);
4679 if (originator_name == NULL && unknown_username != NULL)
4680 originator_name = expand_string(unknown_username);
4681 if (originator_name == NULL) originator_name = US"";
4683 if (originator_login == NULL)
4684 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4688 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4691 originator_name = string_copy(parse_fix_phrase(originator_name,
4692 Ustrlen(originator_name), big_buffer, big_buffer_size));
4694 /* If a message is created by this call of Exim, the uid/gid of its originator
4695 are those of the caller. These values are overridden if an existing message is
4696 read in from the spool. */
4698 originator_uid = real_uid;
4699 originator_gid = real_gid;
4701 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4702 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4704 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4705 returns. We leave this till here so that the originator_ fields are available
4706 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4709 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4713 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4714 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4715 "mua_wrapper is set");
4720 /* If the sender ident has not been set (by a trusted caller) set it to
4721 the caller. This will get overwritten below for an inetd call. If a trusted
4722 caller has set it empty, unset it. */
4724 if (sender_ident == NULL) sender_ident = originator_login;
4725 else if (sender_ident[0] == 0) sender_ident = NULL;
4727 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4728 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4729 originator_* variables set. */
4731 if (test_rewrite_arg >= 0)
4733 really_exim = FALSE;
4734 if (test_rewrite_arg >= argc)
4736 printf("-brw needs an address argument\n");
4737 exim_exit(EXIT_FAILURE);
4739 rewrite_test(argv[test_rewrite_arg]);
4740 exim_exit(EXIT_SUCCESS);
4743 /* A locally-supplied message is considered to be coming from a local user
4744 unless a trusted caller supplies a sender address with -f, or is passing in the
4745 message via SMTP (inetd invocation or otherwise). */
4747 if ((sender_address == NULL && !smtp_input) ||
4748 (!trusted_caller && filter_test == FTEST_NONE))
4750 sender_local = TRUE;
4752 /* A trusted caller can supply authenticated_sender and authenticated_id
4753 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4754 defaults except when host checking. */
4756 if (authenticated_sender == NULL && !host_checking)
4757 authenticated_sender = string_sprintf("%s@%s", originator_login,
4758 qualify_domain_sender);
4759 if (authenticated_id == NULL && !host_checking)
4760 authenticated_id = originator_login;
4763 /* Trusted callers are always permitted to specify the sender address.
4764 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4765 is specified is the empty address. However, if a trusted caller does not
4766 specify a sender address for SMTP input, we leave sender_address unset. This
4767 causes the MAIL commands to be honoured. */
4769 if ((!smtp_input && sender_address == NULL) ||
4770 !receive_check_set_sender(sender_address))
4772 /* Either the caller is not permitted to set a general sender, or this is
4773 non-SMTP input and the trusted caller has not set a sender. If there is no
4774 sender, or if a sender other than <> is set, override with the originator's
4775 login (which will get qualified below), except when checking things. */
4777 if (sender_address == NULL /* No sender_address set */
4779 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4780 !checking && /* Not running tests, AND */
4781 filter_test == FTEST_NONE)) /* Not testing a filter */
4783 sender_address = originator_login;
4784 sender_address_forced = FALSE;
4785 sender_address_domain = 0;
4789 /* Remember whether an untrusted caller set the sender address */
4791 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4793 /* Ensure that the sender address is fully qualified unless it is the empty
4794 address, which indicates an error message, or doesn't exist (root caller, smtp
4795 interface, no -f argument). */
4797 if (sender_address != NULL && sender_address[0] != 0 &&
4798 sender_address_domain == 0)
4799 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4800 qualify_domain_sender);
4802 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4804 /* Handle a request to verify a list of addresses, or test them for delivery.
4805 This must follow the setting of the sender address, since routers can be
4806 predicated upon the sender. If no arguments are given, read addresses from
4807 stdin. Set debug_level to at least D_v to get full output for address testing.
4810 if (verify_address_mode || address_test_mode)
4813 int flags = vopt_qualify;
4815 if (verify_address_mode)
4817 if (!verify_as_sender) flags |= vopt_is_recipient;
4818 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4823 flags |= vopt_is_recipient;
4824 debug_selector |= D_v;
4825 debug_file = stderr;
4826 debug_fd = fileno(debug_file);
4827 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4830 if (recipients_arg < argc)
4832 while (recipients_arg < argc)
4834 uschar *s = argv[recipients_arg++];
4837 BOOL finished = FALSE;
4838 uschar *ss = parse_find_address_end(s, FALSE);
4839 if (*ss == ',') *ss = 0; else finished = TRUE;
4840 test_address(s, flags, &exit_value);
4843 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4850 uschar *s = get_stdinput(NULL, NULL);
4851 if (s == NULL) break;
4852 test_address(s, flags, &exit_value);
4856 exim_exit(exit_value);
4859 /* Handle expansion checking. Either expand items on the command line, or read
4860 from stdin if there aren't any. If -Mset was specified, load the message so
4861 that its variables can be used, but restrict this facility to admin users.
4862 Otherwise, if -bem was used, read a message from stdin. */
4866 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4868 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4871 fprintf(stderr, "exim: permission denied\n");
4874 message_id = argv[msg_action_arg];
4875 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4876 if (!spool_open_datafile(message_id))
4877 printf ("Failed to load message datafile %s\n", message_id);
4878 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4879 printf ("Failed to load message %s\n", message_id);
4882 /* Read a test message from a file. We fudge it up to be on stdin, saving
4883 stdin itself for later reading of expansion strings. */
4885 else if (expansion_test_message != NULL)
4887 int save_stdin = dup(0);
4888 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4891 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4893 return EXIT_FAILURE;
4896 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4897 message_ended = END_NOTENDED;
4898 read_message_body(receive_msg(extract_recipients));
4899 message_linecount += body_linecount;
4900 (void)dup2(save_stdin, 0);
4901 (void)close(save_stdin);
4902 clearerr(stdin); /* Required by Darwin */
4905 /* Allow $recipients for this testing */
4907 enable_dollar_recipients = TRUE;
4909 /* Expand command line items */
4911 if (recipients_arg < argc)
4913 while (recipients_arg < argc)
4915 uschar *s = argv[recipients_arg++];
4916 uschar *ss = expand_string(s);
4917 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4918 else printf("%s\n", CS ss);
4926 char *(*fn_readline)(const char *) = NULL;
4927 void (*fn_addhist)(const char *) = NULL;
4930 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4936 uschar *source = get_stdinput(fn_readline, fn_addhist);
4937 if (source == NULL) break;
4938 ss = expand_string(source);
4940 printf ("Failed: %s\n", expand_string_message);
4941 else printf("%s\n", CS ss);
4945 if (dlhandle != NULL) dlclose(dlhandle);
4949 /* The data file will be open after -Mset */
4951 if (deliver_datafile >= 0)
4953 (void)close(deliver_datafile);
4954 deliver_datafile = -1;
4957 exim_exit(EXIT_SUCCESS);
4961 /* The active host name is normally the primary host name, but it can be varied
4962 for hosts that want to play several parts at once. We need to ensure that it is
4963 set for host checking, and for receiving messages. */
4965 smtp_active_hostname = primary_hostname;
4966 if (raw_active_hostname != NULL)
4968 uschar *nah = expand_string(raw_active_hostname);
4971 if (!expand_string_forcedfail)
4972 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4973 "(smtp_active_hostname): %s", raw_active_hostname,
4974 expand_string_message);
4976 else if (nah[0] != 0) smtp_active_hostname = nah;
4979 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4980 given IP address so that the blocking and relay configuration can be tested.
4981 Unless a sender_ident was set by -oMt, we discard it (the default is the
4982 caller's login name). An RFC 1413 call is made only if we are running in the
4983 test harness and an incoming interface and both ports are specified, because
4984 there is no TCP/IP call to find the ident for. */
4991 if (!sender_ident_set)
4993 sender_ident = NULL;
4994 if (running_in_test_harness && sender_host_port != 0 &&
4995 interface_address != NULL && interface_port != 0)
4996 verify_get_ident(1413);
4999 /* In case the given address is a non-canonical IPv6 address, canonicize
5000 it. The code works for both IPv4 and IPv6, as it happens. */
5002 size = host_aton(sender_host_address, x);
5003 sender_host_address = store_get(48); /* large enough for full IPv6 */
5004 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5006 /* Now set up for testing */
5008 host_build_sender_fullhost();
5012 sender_local = FALSE;
5013 sender_host_notsocket = TRUE;
5014 debug_file = stderr;
5015 debug_fd = fileno(debug_file);
5016 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5017 "**** but without any ident (RFC 1413) callback.\n"
5018 "**** This is not for real!\n\n",
5019 sender_host_address);
5021 if (verify_check_host(&hosts_connection_nolog) == OK)
5022 log_write_selector &= ~L_smtp_connection;
5023 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5025 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5026 because a log line has already been written for all its failure exists
5027 (usually "connection refused: <reason>") and writing another one is
5028 unnecessary clutter. */
5030 if (smtp_start_session())
5032 reset_point = store_get(0);
5035 store_reset(reset_point);
5036 if (smtp_setup_msg() <= 0) break;
5037 if (!receive_msg(FALSE)) break;
5041 exim_exit(EXIT_SUCCESS);
5045 /* Arrange for message reception if recipients or SMTP were specified;
5046 otherwise complain unless a version print (-bV) happened or this is a filter
5047 verification test or info dump.
5048 In the former case, show the configuration file name. */
5050 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5052 if (version_printed)
5054 printf("Configuration file is %s\n", config_main_filename);
5055 return EXIT_SUCCESS;
5058 if (info_flag != CMDINFO_NONE)
5060 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5061 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5064 if (filter_test == FTEST_NONE)
5065 exim_usage(called_as);
5069 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5070 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5071 that we are not called from inetd, because that is rejected above. The
5072 following configuration settings are forced here:
5074 (1) Synchronous delivery (-odi)
5075 (2) Errors to stderr (-oep == -oeq)
5076 (3) No parallel remote delivery
5077 (4) Unprivileged delivery
5079 We don't force overall queueing options because there are several of them;
5080 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5081 to override any SMTP queueing. */
5085 synchronous_delivery = TRUE;
5086 arg_error_handling = ERRORS_STDERR;
5087 remote_max_parallel = 1;
5088 deliver_drop_privilege = TRUE;
5090 queue_smtp_domains = NULL;
5094 /* Prepare to accept one or more new messages on the standard input. When a
5095 message has been read, its id is returned in message_id[]. If doing immediate
5096 delivery, we fork a delivery process for each received message, except for the
5097 last one, where we can save a process switch.
5099 It is only in non-smtp mode that error_handling is allowed to be changed from
5100 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5101 sendmail error modes other than -oem ever actually used? Later: yes.) */
5103 if (!smtp_input) error_handling = arg_error_handling;
5105 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5106 logging being sent down the socket and make an identd call to get the
5111 (void)fclose(stderr);
5112 exim_nullstd(); /* Re-open to /dev/null */
5113 verify_get_ident(IDENT_PORT);
5114 host_build_sender_fullhost();
5115 set_process_info("handling incoming connection from %s via inetd",
5119 /* If the sender host address has been set, build sender_fullhost if it hasn't
5120 already been done (which it will have been for inetd). This caters for the
5121 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5122 so that the test for IP options is skipped for -bs input. */
5124 if (sender_host_address != NULL && sender_fullhost == NULL)
5126 host_build_sender_fullhost();
5127 set_process_info("handling incoming connection from %s via -oMa",
5129 sender_host_notsocket = TRUE;
5132 /* Otherwise, set the sender host as unknown except for inetd calls. This
5133 prevents host checking in the case of -bs not from inetd and also for -bS. */
5135 else if (!is_inetd) sender_host_unknown = TRUE;
5137 /* If stdout does not exist, then dup stdin to stdout. This can happen
5138 if exim is started from inetd. In this case fd 0 will be set to the socket,
5139 but fd 1 will not be set. This also happens for passed SMTP channels. */
5141 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5143 /* Set up the incoming protocol name and the state of the program. Root is
5144 allowed to force received protocol via the -oMr option above. If we have come
5145 via inetd, the process info has already been set up. We don't set
5146 received_protocol here for smtp input, as it varies according to
5147 batch/HELO/EHLO/AUTH/TLS. */
5151 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5152 smtp_batched_input? "batched " : "",
5153 (sender_address!= NULL)? sender_address : originator_login);
5157 if (received_protocol == NULL)
5158 received_protocol = string_sprintf("local%s", called_as);
5159 set_process_info("accepting a local non-SMTP message from <%s>",
5163 /* Initialize the session_local_queue-only flag (this will be ignored if
5164 mua_wrapper is set) */
5167 session_local_queue_only = queue_only;
5169 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5170 the spool if so configured. On failure, we must not attempt to send an error
5171 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5172 error code is given.) */
5174 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5176 fprintf(stderr, "exim: insufficient disk space\n");
5177 return EXIT_FAILURE;
5180 /* If this is smtp input of any kind, real or batched, handle the start of the
5183 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5184 because a log line has already been written for all its failure exists
5185 (usually "connection refused: <reason>") and writing another one is
5186 unnecessary clutter. */
5192 if (verify_check_host(&hosts_connection_nolog) == OK)
5193 log_write_selector &= ~L_smtp_connection;
5194 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5195 if (!smtp_start_session())
5198 exim_exit(EXIT_SUCCESS);
5202 /* Otherwise, set up the input size limit here. */
5206 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5207 if (expand_string_message != NULL)
5209 if (thismessage_size_limit == -1)
5210 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5211 "message_size_limit: %s", expand_string_message);
5213 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5214 "message_size_limit: %s", expand_string_message);
5218 /* Loop for several messages when reading SMTP input. If we fork any child
5219 processes, we don't want to wait for them unless synchronous delivery is
5220 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5221 same as SIG_DFL, despite the fact that documentation often lists the default as
5222 "ignore". This is a confusing area. This is what I know:
5224 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5225 processes that complete simply to go away without ever becoming defunct. You
5226 can't then wait for them - but we don't want to wait for them in the
5227 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5228 happen for all OS (e.g. *BSD is different).
5230 But that's not the end of the story. Some (many? all?) systems have the
5231 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5232 has by default, so it seems that the difference is merely one of default
5233 (compare restarting vs non-restarting signals).
5235 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5236 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5237 of the loop below. Paranoia rules.
5239 February 2003: That's *still* not the end of the story. There are now versions
5240 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5241 process then calls waitpid(), a grumble is written to the system log, because
5242 this is logically inconsistent. In other words, it doesn't like the paranoia.
5243 As a consequenc of this, the waitpid() below is now excluded if we are sure
5244 that SIG_IGN works. */
5246 if (!synchronous_delivery)
5249 struct sigaction act;
5250 act.sa_handler = SIG_IGN;
5251 sigemptyset(&(act.sa_mask));
5252 act.sa_flags = SA_NOCLDWAIT;
5253 sigaction(SIGCHLD, &act, NULL);
5255 signal(SIGCHLD, SIG_IGN);
5259 /* Save the current store pool point, for resetting at the start of
5260 each message, and save the real sender address, if any. */
5262 reset_point = store_get(0);
5263 real_sender_address = sender_address;
5265 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5266 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5271 store_reset(reset_point);
5274 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5275 input and build the recipients list, before calling receive_msg() to read the
5276 message proper. Whatever sender address is given in the SMTP transaction is
5277 often ignored for local senders - we use the actual sender, which is normally
5278 either the underlying user running this process or a -f argument provided by
5279 a trusted caller. It is saved in real_sender_address. The test for whether to
5280 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5285 if ((rc = smtp_setup_msg()) > 0)
5287 if (real_sender_address != NULL &&
5288 !receive_check_set_sender(sender_address))
5290 sender_address = raw_sender = real_sender_address;
5291 sender_address_unrewritten = NULL;
5294 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5295 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5296 the very end. The result of the ACL is ignored (as for other non-SMTP
5297 messages). It is run for its potential side effects. */
5299 if (smtp_batched_input && acl_not_smtp_start != NULL)
5301 uschar *user_msg, *log_msg;
5302 enable_dollar_recipients = TRUE;
5303 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5304 &user_msg, &log_msg);
5305 enable_dollar_recipients = FALSE;
5308 /* Now get the data for the message */
5310 more = receive_msg(extract_recipients);
5311 if (message_id[0] == 0)
5314 smtp_log_no_mail(); /* Log no mail if configured */
5315 exim_exit(EXIT_FAILURE);
5320 smtp_log_no_mail(); /* Log no mail if configured */
5321 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5325 /* In the non-SMTP case, we have all the information from the command
5326 line, but must process it in case it is in the more general RFC822
5327 format, and in any case, to detect syntax errors. Also, it appears that
5328 the use of comma-separated lists as single arguments is common, so we
5329 had better support them. */
5335 int count = argc - recipients_arg;
5336 uschar **list = argv + recipients_arg;
5338 /* These options cannot be changed dynamically for non-SMTP messages */
5340 active_local_sender_retain = local_sender_retain;
5341 active_local_from_check = local_from_check;
5343 /* Save before any rewriting */
5345 raw_sender = string_copy(sender_address);
5347 /* Loop for each argument */
5349 for (i = 0; i < count; i++)
5351 int start, end, domain;
5353 uschar *s = list[i];
5355 /* Loop for each comma-separated address */
5359 BOOL finished = FALSE;
5361 uschar *ss = parse_find_address_end(s, FALSE);
5363 if (*ss == ',') *ss = 0; else finished = TRUE;
5365 /* Check max recipients - if -t was used, these aren't recipients */
5367 if (recipients_max > 0 && ++rcount > recipients_max &&
5368 !extract_recipients)
5369 if (error_handling == ERRORS_STDERR)
5371 fprintf(stderr, "exim: too many recipients\n");
5372 exim_exit(EXIT_FAILURE);
5377 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5378 errors_sender_rc : EXIT_FAILURE;
5381 #ifdef EXPERIMENTAL_INTERNATIONAL
5383 BOOL b = allow_utf8_domains;
5384 allow_utf8_domains = TRUE;
5387 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5389 #ifdef EXPERIMENTAL_INTERNATIONAL
5390 if (string_is_utf8(recipient))
5391 message_smtputf8 = TRUE;
5393 allow_utf8_domains = b;
5396 if (domain == 0 && !allow_unqualified_recipient)
5399 errmess = US"unqualified recipient address not allowed";
5402 if (recipient == NULL)
5404 if (error_handling == ERRORS_STDERR)
5406 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5407 string_printing(list[i]), errmess);
5408 exim_exit(EXIT_FAILURE);
5414 eblock.text1 = string_printing(list[i]);
5415 eblock.text2 = errmess;
5417 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5418 errors_sender_rc : EXIT_FAILURE;
5422 receive_add_recipient(recipient, -1);
5425 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5429 /* Show the recipients when debugging */
5434 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5435 if (recipients_list != NULL)
5437 debug_printf("Recipients:\n");
5438 for (i = 0; i < recipients_count; i++)
5439 debug_printf(" %s\n", recipients_list[i].address);
5443 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5444 ignored; rejecting here would just add complication, and it can just as
5445 well be done later. Allow $recipients to be visible in the ACL. */
5447 if (acl_not_smtp_start != NULL)
5449 uschar *user_msg, *log_msg;
5450 enable_dollar_recipients = TRUE;
5451 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5452 &user_msg, &log_msg);
5453 enable_dollar_recipients = FALSE;
5456 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5457 will just read the headers for the message, and not write anything onto the
5460 message_ended = END_NOTENDED;
5461 more = receive_msg(extract_recipients);
5463 /* more is always FALSE here (not SMTP message) when reading a message
5464 for real; when reading the headers of a message for filter testing,
5465 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5467 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5468 } /* Non-SMTP message reception */
5470 /* If this is a filter testing run, there are headers in store, but
5471 no message on the spool. Run the filtering code in testing mode, setting
5472 the domain to the qualify domain and the local part to the current user,
5473 unless they have been set by options. The prefix and suffix are left unset
5474 unless specified. The the return path is set to to the sender unless it has
5475 already been set from a return-path header in the message. */
5477 if (filter_test != FTEST_NONE)
5479 deliver_domain = (ftest_domain != NULL)?
5480 ftest_domain : qualify_domain_recipient;
5481 deliver_domain_orig = deliver_domain;
5482 deliver_localpart = (ftest_localpart != NULL)?
5483 ftest_localpart : originator_login;
5484 deliver_localpart_orig = deliver_localpart;
5485 deliver_localpart_prefix = ftest_prefix;
5486 deliver_localpart_suffix = ftest_suffix;
5487 deliver_home = originator_home;
5489 if (return_path == NULL)
5491 printf("Return-path copied from sender\n");
5492 return_path = string_copy(sender_address);
5495 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5496 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5498 receive_add_recipient(
5499 string_sprintf("%s%s%s@%s",
5500 (ftest_prefix == NULL)? US"" : ftest_prefix,
5502 (ftest_suffix == NULL)? US"" : ftest_suffix,
5503 deliver_domain), -1);
5505 printf("Recipient = %s\n", recipients_list[0].address);
5506 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5507 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5509 if (chdir("/")) /* Get away from wherever the user is running this from */
5511 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5512 exim_exit(EXIT_FAILURE);
5515 /* Now we run either a system filter test, or a user filter test, or both.
5516 In the latter case, headers added by the system filter will persist and be
5517 available to the user filter. We need to copy the filter variables
5520 if ((filter_test & FTEST_SYSTEM) != 0)
5522 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5523 exim_exit(EXIT_FAILURE);
5526 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5528 if ((filter_test & FTEST_USER) != 0)
5530 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5531 exim_exit(EXIT_FAILURE);
5534 exim_exit(EXIT_SUCCESS);
5537 /* Else act on the result of message reception. We should not get here unless
5538 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5539 will be TRUE. If it is not, check on the number of messages received in this
5542 if (!session_local_queue_only &&
5543 smtp_accept_queue_per_connection > 0 &&
5544 receive_messagecount > smtp_accept_queue_per_connection)
5546 session_local_queue_only = TRUE;
5547 queue_only_reason = 2;
5550 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5551 and queue_only_load is set, check that the load average is below it. If it is
5552 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5553 default), we put the whole session into queue_only mode. It then remains this
5554 way for any subsequent messages on the same SMTP connection. This is a
5555 deliberate choice; even though the load average may fall, it doesn't seem
5556 right to deliver later messages on the same call when not delivering earlier
5557 ones. However, there are odd cases where this is not wanted, so this can be
5558 changed by setting queue_only_load_latch false. */
5560 local_queue_only = session_local_queue_only;
5561 if (!local_queue_only && queue_only_load >= 0)
5563 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5564 if (local_queue_only)
5566 queue_only_reason = 3;
5567 if (queue_only_load_latch) session_local_queue_only = TRUE;
5571 /* If running as an MUA wrapper, all queueing options and freezing options
5575 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5577 /* Log the queueing here, when it will get a message id attached, but
5578 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5581 if (local_queue_only) switch(queue_only_reason)
5584 log_write(L_delay_delivery,
5585 LOG_MAIN, "no immediate delivery: more than %d messages "
5586 "received in one connection", smtp_accept_queue_per_connection);
5590 log_write(L_delay_delivery,
5591 LOG_MAIN, "no immediate delivery: load average %.2f",
5592 (double)load_average/1000.0);
5596 /* Else do the delivery unless the ACL or local_scan() called for queue only
5597 or froze the message. Always deliver in a separate process. A fork failure is
5598 not a disaster, as the delivery will eventually happen on a subsequent queue
5599 run. The search cache must be tidied before the fork, as the parent will
5600 do it before exiting. The child will trigger a lookup failure and
5601 thereby defer the delivery if it tries to use (for example) a cached ldap
5602 connection that the parent has called unbind on. */
5604 else if (!queue_only_policy && !deliver_freeze)
5609 if ((pid = fork()) == 0)
5612 close_unwanted(); /* Close unwanted file descriptors and TLS */
5613 exim_nullstd(); /* Ensure std{in,out,err} exist */
5615 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5616 mode, deliver_drop_privilege is forced TRUE). */
5618 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5620 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5622 /* Control does not return here. */
5625 /* No need to re-exec */
5627 rc = deliver_message(message_id, FALSE, FALSE);
5629 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5630 EXIT_SUCCESS : EXIT_FAILURE);
5635 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5636 "process: %s", strerror(errno));
5639 /* In the parent, wait if synchronous delivery is required. This will
5640 always be the case in MUA wrapper mode. */
5642 else if (synchronous_delivery)
5645 while (wait(&status) != pid);
5646 if ((status & 0x00ff) != 0)
5647 log_write(0, LOG_MAIN|LOG_PANIC,
5648 "process %d crashed with signal %d while delivering %s",
5649 (int)pid, status & 0x00ff, message_id);
5650 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5654 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5655 automatically reaps children (see comments above the loop), clear away any
5656 finished subprocesses here, in case there are lots of messages coming in
5657 from the same source. */
5659 #ifndef SIG_IGN_WORKS
5660 while (waitpid(-1, NULL, WNOHANG) > 0);
5664 exim_exit(EXIT_SUCCESS); /* Never returns */
5665 return 0; /* To stop compiler warning */