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");
823 #ifndef DISABLE_DNSSEC
824 fprintf(f, " DNSSEC");
832 #ifdef EXPERIMENTAL_SPF
833 fprintf(f, " Experimental_SPF");
835 #ifdef EXPERIMENTAL_SRS
836 fprintf(f, " Experimental_SRS");
838 #ifdef EXPERIMENTAL_BRIGHTMAIL
839 fprintf(f, " Experimental_Brightmail");
841 #ifdef EXPERIMENTAL_DANE
842 fprintf(f, " Experimental_DANE");
844 #ifdef EXPERIMENTAL_DCC
845 fprintf(f, " Experimental_DCC");
847 #ifdef EXPERIMENTAL_DMARC
848 fprintf(f, " Experimental_DMARC");
850 #ifdef EXPERIMENTAL_PROXY
851 fprintf(f, " Experimental_Proxy");
853 #ifdef EXPERIMENTAL_EVENT
854 fprintf(f, " Experimental_Event");
856 #ifdef EXPERIMENTAL_REDIS
857 fprintf(f, " Experimental_Redis");
859 #ifdef EXPERIMENTAL_SOCKS
860 fprintf(f, " Experimental_SOCKS");
862 #ifdef EXPERIMENTAL_INTERNATIONAL
863 fprintf(f, " Experimental_International");
867 fprintf(f, "Lookups (built-in):");
868 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
869 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
871 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
874 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
875 fprintf(f, " dbm dbmjz dbmnz");
877 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
878 fprintf(f, " dnsdb");
880 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
881 fprintf(f, " dsearch");
883 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
884 fprintf(f, " ibase");
886 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
887 fprintf(f, " ldap ldapdn ldapm");
889 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
890 fprintf(f, " mysql");
892 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
893 fprintf(f, " nis nis0");
895 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
896 fprintf(f, " nisplus");
898 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
899 fprintf(f, " oracle");
901 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
902 fprintf(f, " passwd");
904 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
905 fprintf(f, " pgsql");
907 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
908 fprintf(f, " sqlite");
910 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
911 fprintf(f, " testdb");
913 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
914 fprintf(f, " whoson");
918 fprintf(f, "Authenticators:");
920 fprintf(f, " cram_md5");
922 #ifdef AUTH_CYRUS_SASL
923 fprintf(f, " cyrus_sasl");
926 fprintf(f, " dovecot");
929 fprintf(f, " gsasl");
931 #ifdef AUTH_HEIMDAL_GSSAPI
932 fprintf(f, " heimdal_gssapi");
934 #ifdef AUTH_PLAINTEXT
935 fprintf(f, " plaintext");
942 fprintf(f, "Routers:");
944 fprintf(f, " accept");
946 #ifdef ROUTER_DNSLOOKUP
947 fprintf(f, " dnslookup");
949 #ifdef ROUTER_IPLITERAL
950 fprintf(f, " ipliteral");
952 #ifdef ROUTER_IPLOOKUP
953 fprintf(f, " iplookup");
955 #ifdef ROUTER_MANUALROUTE
956 fprintf(f, " manualroute");
958 #ifdef ROUTER_QUERYPROGRAM
959 fprintf(f, " queryprogram");
961 #ifdef ROUTER_REDIRECT
962 fprintf(f, " redirect");
966 fprintf(f, "Transports:");
967 #ifdef TRANSPORT_APPENDFILE
968 fprintf(f, " appendfile");
969 #ifdef SUPPORT_MAILDIR
970 fprintf(f, "/maildir");
972 #ifdef SUPPORT_MAILSTORE
973 fprintf(f, "/mailstore");
979 #ifdef TRANSPORT_AUTOREPLY
980 fprintf(f, " autoreply");
982 #ifdef TRANSPORT_LMTP
985 #ifdef TRANSPORT_PIPE
988 #ifdef TRANSPORT_SMTP
993 if (fixed_never_users[0] > 0)
996 fprintf(f, "Fixed never_users: ");
997 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
998 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
999 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1002 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1004 /* Everything else is details which are only worth reporting when debugging.
1005 Perhaps the tls_version_report should move into this too. */
1010 /* clang defines __GNUC__ (at least, for me) so test for it first */
1011 #if defined(__clang__)
1012 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1013 #elif defined(__GNUC__)
1014 fprintf(f, "Compiler: GCC [%s]\n",
1018 "? unknown version ?"
1022 fprintf(f, "Compiler: <unknown>\n");
1026 tls_version_report(f);
1028 #ifdef EXPERIMENTAL_INTERNATIONAL
1029 utf8_version_report(f);
1032 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1033 if (authi->version_report)
1034 (*authi->version_report)(f);
1036 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1037 characters; unless it's an ancient version of PCRE in which case it
1039 #ifndef PCRE_PRERELEASE
1040 #define PCRE_PRERELEASE
1043 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1044 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1046 PCRE_MAJOR, PCRE_MINOR,
1047 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1050 #undef EXPAND_AND_QUOTE
1053 for (i = 0; i < lookup_list_count; i++)
1054 if (lookup_list[i]->version_report)
1055 lookup_list[i]->version_report(f);
1057 #ifdef WHITELIST_D_MACROS
1058 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1060 fprintf(f, "WHITELIST_D_MACROS unset\n");
1062 #ifdef TRUSTED_CONFIG_LIST
1063 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1065 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1072 /*************************************************
1073 * Show auxiliary information about Exim *
1074 *************************************************/
1077 show_exim_information(enum commandline_info request, FILE *stream)
1084 fprintf(stream, "Oops, something went wrong.\n");
1088 "The -bI: flag takes a string indicating which information to provide.\n"
1089 "If the string is not recognised, you'll get this help (on stderr).\n"
1091 " exim -bI:help this information\n"
1092 " exim -bI:dscp dscp value keywords known\n"
1093 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1097 for (pp = exim_sieve_extension_list; *pp; ++pp)
1098 fprintf(stream, "%s\n", *pp);
1101 dscp_list_to_stream(stream);
1107 /*************************************************
1108 * Quote a local part *
1109 *************************************************/
1111 /* This function is used when a sender address or a From: or Sender: header
1112 line is being created from the caller's login, or from an authenticated_id. It
1113 applies appropriate quoting rules for a local part.
1115 Argument: the local part
1116 Returns: the local part, quoted if necessary
1120 local_part_quote(uschar *lpart)
1122 BOOL needs_quote = FALSE;
1127 for (t = lpart; !needs_quote && *t != 0; t++)
1129 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1130 (*t != '.' || t == lpart || t[1] == 0);
1133 if (!needs_quote) return lpart;
1136 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1140 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1143 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1146 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1147 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1148 yield = string_cat(yield, &size, &ptr, nq, 1);
1152 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1160 /*************************************************
1161 * Load readline() functions *
1162 *************************************************/
1164 /* This function is called from testing executions that read data from stdin,
1165 but only when running as the calling user. Currently, only -be does this. The
1166 function loads the readline() function library and passes back the functions.
1167 On some systems, it needs the curses library, so load that too, but try without
1168 it if loading fails. All this functionality has to be requested at build time.
1171 fn_readline_ptr pointer to where to put the readline pointer
1172 fn_addhist_ptr pointer to where to put the addhistory function
1174 Returns: the dlopen handle or NULL on failure
1178 set_readline(char * (**fn_readline_ptr)(const char *),
1179 void (**fn_addhist_ptr)(const char *))
1182 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1184 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1185 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1187 if (dlhandle != NULL)
1189 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1190 * char * readline (const char *prompt);
1191 * void add_history (const char *string);
1193 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1194 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1198 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1207 /*************************************************
1208 * Get a line from stdin for testing things *
1209 *************************************************/
1211 /* This function is called when running tests that can take a number of lines
1212 of input (for example, -be and -bt). It handles continuations and trailing
1213 spaces. And prompting and a blank line output on eof. If readline() is in use,
1214 the arguments are non-NULL and provide the relevant functions.
1217 fn_readline readline function or NULL
1218 fn_addhist addhist function or NULL
1220 Returns: pointer to dynamic memory, or NULL at end of file
1224 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1229 uschar *yield = NULL;
1231 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1235 uschar buffer[1024];
1239 char *readline_line = NULL;
1240 if (fn_readline != NULL)
1242 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1243 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1244 p = US readline_line;
1249 /* readline() not in use */
1252 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1256 /* Handle the line */
1258 ss = p + (int)Ustrlen(p);
1259 while (ss > p && isspace(ss[-1])) ss--;
1263 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1266 yield = string_cat(yield, &size, &ptr, p, ss - p);
1269 if (fn_readline != NULL) free(readline_line);
1272 if (ss == p || yield[ptr-1] != '\\')
1280 if (yield == NULL) printf("\n");
1286 /*************************************************
1287 * Output usage information for the program *
1288 *************************************************/
1290 /* This function is called when there are no recipients
1291 or a specific --help argument was added.
1294 progname information on what name we were called by
1296 Returns: DOES NOT RETURN
1300 exim_usage(uschar *progname)
1303 /* Handle specific program invocation varients */
1304 if (Ustrcmp(progname, US"-mailq") == 0)
1307 "mailq - list the contents of the mail queue\n\n"
1308 "For a list of options, see the Exim documentation.\n");
1312 /* Generic usage - we output this whatever happens */
1314 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1315 "not directly from a shell command line. Options and/or arguments control\n"
1316 "what it does when called. For a list of options, see the Exim documentation.\n");
1323 /*************************************************
1324 * Validate that the macros given are okay *
1325 *************************************************/
1327 /* Typically, Exim will drop privileges if macros are supplied. In some
1328 cases, we want to not do so.
1330 Arguments: none (macros is a global)
1331 Returns: true if trusted, false otherwise
1335 macros_trusted(void)
1337 #ifdef WHITELIST_D_MACROS
1339 uschar *whitelisted, *end, *p, **whites, **w;
1340 int white_count, i, n;
1342 BOOL prev_char_item, found;
1347 #ifndef WHITELIST_D_MACROS
1351 /* We only trust -D overrides for some invoking users:
1352 root, the exim run-time user, the optional config owner user.
1353 I don't know why config-owner would be needed, but since they can own the
1354 config files anyway, there's no security risk to letting them override -D. */
1355 if ( ! ((real_uid == root_uid)
1356 || (real_uid == exim_uid)
1357 #ifdef CONFIGURE_OWNER
1358 || (real_uid == config_uid)
1362 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1366 /* Get a list of macros which are whitelisted */
1367 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1368 prev_char_item = FALSE;
1370 for (p = whitelisted; *p != '\0'; ++p)
1372 if (*p == ':' || isspace(*p))
1377 prev_char_item = FALSE;
1380 if (!prev_char_item)
1381 prev_char_item = TRUE;
1388 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1389 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1394 if (i == white_count)
1396 while (*p != '\0' && p < end)
1402 /* The list of macros should be very short. Accept the N*M complexity. */
1403 for (m = macros; m != NULL; m = m->next)
1406 for (w = whites; *w; ++w)
1407 if (Ustrcmp(*w, m->name) == 0)
1414 if (m->replacement == NULL)
1416 len = Ustrlen(m->replacement);
1419 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1420 0, PCRE_EOPT, NULL, 0);
1423 if (n != PCRE_ERROR_NOMATCH)
1424 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1428 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1434 /*************************************************
1435 * Entry point and high-level code *
1436 *************************************************/
1438 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1439 the appropriate action. All the necessary functions are present in the one
1440 binary. I originally thought one should split it up, but it turns out that so
1441 much of the apparatus is needed in each chunk that one might as well just have
1442 it all available all the time, which then makes the coding easier as well.
1445 argc count of entries in argv
1446 argv argument strings, with argv[0] being the program name
1448 Returns: EXIT_SUCCESS if terminated successfully
1449 EXIT_FAILURE otherwise, except when a message has been sent
1450 to the sender, and -oee was given
1454 main(int argc, char **cargv)
1456 uschar **argv = USS cargv;
1457 int arg_receive_timeout = -1;
1458 int arg_smtp_receive_timeout = -1;
1459 int arg_error_handling = error_handling;
1460 int filter_sfd = -1;
1461 int filter_ufd = -1;
1464 int list_queue_option = 0;
1466 int msg_action_arg = -1;
1467 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1468 int queue_only_reason = 0;
1470 int perl_start_option = 0;
1472 int recipients_arg = argc;
1473 int sender_address_domain = 0;
1474 int test_retry_arg = -1;
1475 int test_rewrite_arg = -1;
1476 BOOL arg_queue_only = FALSE;
1477 BOOL bi_option = FALSE;
1478 BOOL checking = FALSE;
1479 BOOL count_queue = FALSE;
1480 BOOL expansion_test = FALSE;
1481 BOOL extract_recipients = FALSE;
1482 BOOL flag_G = FALSE;
1483 BOOL flag_n = FALSE;
1484 BOOL forced_delivery = FALSE;
1485 BOOL f_end_dot = FALSE;
1486 BOOL deliver_give_up = FALSE;
1487 BOOL list_queue = FALSE;
1488 BOOL list_options = FALSE;
1489 BOOL local_queue_only;
1491 BOOL one_msg_action = FALSE;
1492 BOOL queue_only_set = FALSE;
1493 BOOL receiving_message = TRUE;
1494 BOOL sender_ident_set = FALSE;
1495 BOOL session_local_queue_only;
1497 BOOL removed_privilege = FALSE;
1498 BOOL usage_wanted = FALSE;
1499 BOOL verify_address_mode = FALSE;
1500 BOOL verify_as_sender = FALSE;
1501 BOOL version_printed = FALSE;
1502 uschar *alias_arg = NULL;
1503 uschar *called_as = US"";
1504 uschar *cmdline_syslog_name = NULL;
1505 uschar *start_queue_run_id = NULL;
1506 uschar *stop_queue_run_id = NULL;
1507 uschar *expansion_test_message = NULL;
1508 uschar *ftest_domain = NULL;
1509 uschar *ftest_localpart = NULL;
1510 uschar *ftest_prefix = NULL;
1511 uschar *ftest_suffix = NULL;
1512 uschar *log_oneline = NULL;
1513 uschar *malware_test_file = NULL;
1514 uschar *real_sender_address;
1515 uschar *originator_home = US"/";
1520 struct stat statbuf;
1521 pid_t passed_qr_pid = (pid_t)0;
1522 int passed_qr_pipe = -1;
1523 gid_t group_list[NGROUPS_MAX];
1525 /* For the -bI: flag */
1526 enum commandline_info info_flag = CMDINFO_NONE;
1527 BOOL info_stdout = FALSE;
1529 /* Possible options for -R and -S */
1531 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1533 /* Need to define this in case we need to change the environment in order
1534 to get rid of a bogus time zone. We have to make it char rather than uschar
1535 because some OS define it in /usr/include/unistd.h. */
1537 extern char **environ;
1539 /* If the Exim user and/or group and/or the configuration file owner/group were
1540 defined by ref:name at build time, we must now find the actual uid/gid values.
1541 This is a feature to make the lives of binary distributors easier. */
1543 #ifdef EXIM_USERNAME
1544 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1548 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1552 /* If ref:name uses a number as the name, route_finduser() returns
1553 TRUE with exim_uid set and pw coerced to NULL. */
1555 exim_gid = pw->pw_gid;
1556 #ifndef EXIM_GROUPNAME
1560 "exim: ref:name should specify a usercode, not a group.\n"
1561 "exim: can't let you get away with it unless you also specify a group.\n");
1568 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1574 #ifdef EXIM_GROUPNAME
1575 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1577 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1583 #ifdef CONFIGURE_OWNERNAME
1584 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1586 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1587 CONFIGURE_OWNERNAME);
1592 /* We default the system_filter_user to be the Exim run-time user, as a
1593 sane non-root value. */
1594 system_filter_uid = exim_uid;
1596 #ifdef CONFIGURE_GROUPNAME
1597 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1599 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1600 CONFIGURE_GROUPNAME);
1605 /* In the Cygwin environment, some initialization needs doing. It is fudged
1606 in by means of this macro. */
1612 /* Check a field which is patched when we are running Exim within its
1613 testing harness; do a fast initial check, and then the whole thing. */
1615 running_in_test_harness =
1616 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1618 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1619 at the start of a program; however, it seems that some environments do not
1620 follow this. A "strange" locale can affect the formatting of timestamps, so we
1623 setlocale(LC_ALL, "C");
1625 /* Set up the default handler for timing using alarm(). */
1627 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1629 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1630 because store_malloc writes a log entry on failure. */
1632 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1633 if (log_buffer == NULL)
1635 fprintf(stderr, "exim: failed to get store for log buffer\n");
1639 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1640 NULL when the daemon is run and the file is closed. We have to use this
1641 indirection, because some systems don't allow writing to the variable "stderr".
1644 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1646 /* Arrange for the PCRE regex library to use our store functions. Note that
1647 the normal calls are actually macros that add additional arguments for
1648 debugging purposes so we have to assign specially constructed functions here.
1649 The default is to use store in the stacking pool, but this is overridden in the
1650 regex_must_compile() function. */
1652 pcre_malloc = function_store_get;
1653 pcre_free = function_dummy_free;
1655 /* Ensure there is a big buffer for temporary use in several places. It is put
1656 in malloc store so that it can be freed for enlargement if necessary. */
1658 big_buffer = store_malloc(big_buffer_size);
1660 /* Set up the handler for the data request signal, and set the initial
1661 descriptive text. */
1663 set_process_info("initializing");
1664 os_restarting_signal(SIGUSR1, usr1_handler);
1666 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1667 in the daemon code. For the rest of Exim's uses, we ignore it. */
1669 signal(SIGHUP, SIG_IGN);
1671 /* We don't want to die on pipe errors as the code is written to handle
1672 the write error instead. */
1674 signal(SIGPIPE, SIG_IGN);
1676 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1677 set to SIG_IGN. This causes subprocesses that complete before the parent
1678 process waits for them not to hang around, so when Exim calls wait(), nothing
1679 is there. The wait() code has been made robust against this, but let's ensure
1680 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1681 ending status. We use sigaction rather than plain signal() on those OS where
1682 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1683 problem on AIX with this.) */
1687 struct sigaction act;
1688 act.sa_handler = SIG_DFL;
1689 sigemptyset(&(act.sa_mask));
1691 sigaction(SIGCHLD, &act, NULL);
1694 signal(SIGCHLD, SIG_DFL);
1697 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1702 /* Set up the version number. Set up the leading 'E' for the external form of
1703 message ids, set the pointer to the internal form, and initialize it to
1704 indicate no message being processed. */
1707 message_id_option[0] = '-';
1708 message_id_external = message_id_option + 1;
1709 message_id_external[0] = 'E';
1710 message_id = message_id_external + 1;
1713 /* Set the umask to zero so that any files Exim creates using open() are
1714 created with the modes that it specifies. NOTE: Files created with fopen() have
1715 a problem, which was not recognized till rather late (February 2006). With this
1716 umask, such files will be world writeable. (They are all content scanning files
1717 in the spool directory, which isn't world-accessible, so this is not a
1718 disaster, but it's untidy.) I don't want to change this overall setting,
1719 however, because it will interact badly with the open() calls. Instead, there's
1720 now a function called modefopen() that fiddles with the umask while calling
1725 /* Precompile the regular expression for matching a message id. Keep this in
1726 step with the code that generates ids in the accept.c module. We need to do
1727 this here, because the -M options check their arguments for syntactic validity
1728 using mac_ismsgid, which uses this. */
1731 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1733 /* Precompile the regular expression that is used for matching an SMTP error
1734 code, possibly extended, at the start of an error message. Note that the
1735 terminating whitespace character is included. */
1738 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1741 #ifdef WHITELIST_D_MACROS
1742 /* Precompile the regular expression used to filter the content of macros
1743 given to -D for permissibility. */
1745 regex_whitelisted_macro =
1746 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1750 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1751 this seems to be a generally accepted convention, since one finds symbolic
1752 links called "mailq" in standard OS configurations. */
1754 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1755 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1758 receiving_message = FALSE;
1759 called_as = US"-mailq";
1762 /* If the program is called as "rmail" treat it as equivalent to
1763 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1764 i.e. preventing a single dot on a line from terminating the message, and
1765 returning with zero return code, even in cases of error (provided an error
1766 message has been sent). */
1768 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1769 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1772 called_as = US"-rmail";
1773 errors_sender_rc = EXIT_SUCCESS;
1776 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1777 this is a smail convention. */
1779 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1780 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1782 smtp_input = smtp_batched_input = TRUE;
1783 called_as = US"-rsmtp";
1786 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1787 this is a smail convention. */
1789 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1790 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1793 receiving_message = FALSE;
1794 called_as = US"-runq";
1797 /* If the program is called as "newaliases" treat it as equivalent to
1798 "exim -bi"; this is a sendmail convention. */
1800 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1801 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1804 receiving_message = FALSE;
1805 called_as = US"-newaliases";
1808 /* Save the original effective uid for a couple of uses later. It should
1809 normally be root, but in some esoteric environments it may not be. */
1811 original_euid = geteuid();
1813 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1814 to be the same as the real ones. This makes a difference only if Exim is setuid
1815 (or setgid) to something other than root, which could be the case in some
1816 special configurations. */
1818 real_uid = getuid();
1819 real_gid = getgid();
1821 if (real_uid == root_uid)
1823 rv = setgid(real_gid);
1826 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1827 (long int)real_gid, strerror(errno));
1830 rv = setuid(real_uid);
1833 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1834 (long int)real_uid, strerror(errno));
1839 /* If neither the original real uid nor the original euid was root, Exim is
1840 running in an unprivileged state. */
1842 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1844 /* Scan the program's arguments. Some can be dealt with right away; others are
1845 simply recorded for checking and handling afterwards. Do a high-level switch
1846 on the second character (the one after '-'), to save some effort. */
1848 for (i = 1; i < argc; i++)
1850 BOOL badarg = FALSE;
1851 uschar *arg = argv[i];
1855 /* An argument not starting with '-' is the start of a recipients list;
1856 break out of the options-scanning loop. */
1864 /* An option consistion of -- terminates the options */
1866 if (Ustrcmp(arg, "--") == 0)
1868 recipients_arg = i + 1;
1872 /* Handle flagged options */
1874 switchchar = arg[1];
1877 /* Make all -ex options synonymous with -oex arguments, since that
1878 is assumed by various callers. Also make -qR options synonymous with -R
1879 options, as that seems to be required as well. Allow for -qqR too, and
1880 the same for -S options. */
1882 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1883 Ustrncmp(arg+1, "qR", 2) == 0 ||
1884 Ustrncmp(arg+1, "qS", 2) == 0)
1886 switchchar = arg[2];
1889 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1891 switchchar = arg[3];
1893 queue_2stage = TRUE;
1896 /* Make -r synonymous with -f, since it is a documented alias */
1898 else if (arg[1] == 'r') switchchar = 'f';
1900 /* Make -ov synonymous with -v */
1902 else if (Ustrcmp(arg, "-ov") == 0)
1908 /* deal with --option_aliases */
1909 else if (switchchar == '-')
1911 if (Ustrcmp(argrest, "help") == 0)
1913 usage_wanted = TRUE;
1916 else if (Ustrcmp(argrest, "version") == 0)
1923 /* High-level switch on active initial letter */
1928 /* sendmail uses -Ac and -Am to control which .cf file is used;
1931 if (*argrest == '\0') { badarg = TRUE; break; }
1934 BOOL ignore = FALSE;
1939 if (*(argrest + 1) == '\0')
1943 if (!ignore) { badarg = TRUE; break; }
1947 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1948 so has no need of it. */
1951 if (*argrest == 0) i++; /* Skip over the type */
1956 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1958 /* -bd: Run in daemon mode, awaiting SMTP connections.
1959 -bdf: Ditto, but in the foreground.
1962 if (*argrest == 'd')
1964 daemon_listen = TRUE;
1965 if (*(++argrest) == 'f') background_daemon = FALSE;
1966 else if (*argrest != 0) { badarg = TRUE; break; }
1969 /* -be: Run in expansion test mode
1970 -bem: Ditto, but read a message from a file first
1973 else if (*argrest == 'e')
1975 expansion_test = checking = TRUE;
1976 if (argrest[1] == 'm')
1978 if (++i >= argc) { badarg = TRUE; break; }
1979 expansion_test_message = argv[i];
1982 if (argrest[1] != 0) { badarg = TRUE; break; }
1985 /* -bF: Run system filter test */
1987 else if (*argrest == 'F')
1989 filter_test |= FTEST_SYSTEM;
1990 if (*(++argrest) != 0) { badarg = TRUE; break; }
1991 if (++i < argc) filter_test_sfile = argv[i]; else
1993 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1998 /* -bf: Run user filter test
1999 -bfd: Set domain for filter testing
2000 -bfl: Set local part for filter testing
2001 -bfp: Set prefix for filter testing
2002 -bfs: Set suffix for filter testing
2005 else if (*argrest == 'f')
2007 if (*(++argrest) == 0)
2009 filter_test |= FTEST_USER;
2010 if (++i < argc) filter_test_ufile = argv[i]; else
2012 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2020 fprintf(stderr, "exim: string expected after %s\n", arg);
2023 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2024 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2025 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2026 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2027 else { badarg = TRUE; break; }
2031 /* -bh: Host checking - an IP address must follow. */
2033 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2035 if (++i >= argc) { badarg = TRUE; break; }
2036 sender_host_address = argv[i];
2037 host_checking = checking = log_testing_mode = TRUE;
2038 host_checking_callout = argrest[1] == 'c';
2041 /* -bi: This option is used by sendmail to initialize *the* alias file,
2042 though it has the -oA option to specify a different file. Exim has no
2043 concept of *the* alias file, but since Sun's YP make script calls
2044 sendmail this way, some support must be provided. */
2046 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2048 /* -bI: provide information, of the type to follow after a colon.
2049 This is an Exim flag. */
2051 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2053 uschar *p = &argrest[2];
2054 info_flag = CMDINFO_HELP;
2057 if (strcmpic(p, CUS"sieve") == 0)
2059 info_flag = CMDINFO_SIEVE;
2062 else if (strcmpic(p, CUS"dscp") == 0)
2064 info_flag = CMDINFO_DSCP;
2067 else if (strcmpic(p, CUS"help") == 0)
2074 /* -bm: Accept and deliver message - the default option. Reinstate
2075 receiving_message, which got turned off for all -b options. */
2077 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2079 /* -bmalware: test the filename given for malware */
2081 else if (Ustrcmp(argrest, "malware") == 0)
2083 if (++i >= argc) { badarg = TRUE; break; }
2084 malware_test_file = argv[i];
2087 /* -bnq: For locally originating messages, do not qualify unqualified
2088 addresses. In the envelope, this causes errors; in header lines they
2091 else if (Ustrcmp(argrest, "nq") == 0)
2093 allow_unqualified_sender = FALSE;
2094 allow_unqualified_recipient = FALSE;
2097 /* -bpxx: List the contents of the mail queue, in various forms. If
2098 the option is -bpc, just a queue count is needed. Otherwise, if the
2099 first letter after p is r, then order is random. */
2101 else if (*argrest == 'p')
2103 if (*(++argrest) == 'c')
2106 if (*(++argrest) != 0) badarg = TRUE;
2110 if (*argrest == 'r')
2112 list_queue_option = 8;
2115 else list_queue_option = 0;
2119 /* -bp: List the contents of the mail queue, top-level only */
2121 if (*argrest == 0) {}
2123 /* -bpu: List the contents of the mail queue, top-level undelivered */
2125 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2127 /* -bpa: List the contents of the mail queue, including all delivered */
2129 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2131 /* Unknown after -bp[r] */
2141 /* -bP: List the configuration variables given as the address list.
2142 Force -v, so configuration errors get displayed. */
2144 else if (Ustrcmp(argrest, "P") == 0)
2146 list_options = TRUE;
2147 debug_selector |= D_v;
2148 debug_file = stderr;
2151 /* -brt: Test retry configuration lookup */
2153 else if (Ustrcmp(argrest, "rt") == 0)
2155 test_retry_arg = i + 1;
2159 /* -brw: Test rewrite configuration */
2161 else if (Ustrcmp(argrest, "rw") == 0)
2163 test_rewrite_arg = i + 1;
2167 /* -bS: Read SMTP commands on standard input, but produce no replies -
2168 all errors are reported by sending messages. */
2170 else if (Ustrcmp(argrest, "S") == 0)
2171 smtp_input = smtp_batched_input = receiving_message = TRUE;
2173 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2174 on standard output. */
2176 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2178 /* -bt: address testing mode */
2180 else if (Ustrcmp(argrest, "t") == 0)
2181 address_test_mode = checking = log_testing_mode = TRUE;
2183 /* -bv: verify addresses */
2185 else if (Ustrcmp(argrest, "v") == 0)
2186 verify_address_mode = checking = log_testing_mode = TRUE;
2188 /* -bvs: verify sender addresses */
2190 else if (Ustrcmp(argrest, "vs") == 0)
2192 verify_address_mode = checking = log_testing_mode = TRUE;
2193 verify_as_sender = TRUE;
2196 /* -bV: Print version string and support details */
2198 else if (Ustrcmp(argrest, "V") == 0)
2200 printf("Exim version %s #%s built %s\n", version_string,
2201 version_cnumber, version_date);
2202 printf("%s\n", CS version_copyright);
2203 version_printed = TRUE;
2204 show_whats_supported(stdout);
2207 /* -bw: inetd wait mode, accept a listening socket as stdin */
2209 else if (*argrest == 'w')
2211 inetd_wait_mode = TRUE;
2212 background_daemon = FALSE;
2213 daemon_listen = TRUE;
2214 if (*(++argrest) != '\0')
2216 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2217 if (inetd_wait_timeout <= 0)
2219 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2229 /* -C: change configuration file list; ignore if it isn't really
2230 a change! Enforce a prefix check if required. */
2235 if(++i < argc) argrest = argv[i]; else
2236 { badarg = TRUE; break; }
2238 if (Ustrcmp(config_main_filelist, argrest) != 0)
2240 #ifdef ALT_CONFIG_PREFIX
2242 int len = Ustrlen(ALT_CONFIG_PREFIX);
2243 uschar *list = argrest;
2245 while((filename = string_nextinlist(&list, &sep, big_buffer,
2246 big_buffer_size)) != NULL)
2248 if ((Ustrlen(filename) < len ||
2249 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2250 Ustrstr(filename, "/../") != NULL) &&
2251 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2253 fprintf(stderr, "-C Permission denied\n");
2258 if (real_uid != root_uid)
2260 #ifdef TRUSTED_CONFIG_LIST
2262 if (real_uid != exim_uid
2263 #ifdef CONFIGURE_OWNER
2264 && real_uid != config_uid
2267 trusted_config = FALSE;
2270 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2273 struct stat statbuf;
2275 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2276 (statbuf.st_uid != root_uid /* owner not root */
2277 #ifdef CONFIGURE_OWNER
2278 && statbuf.st_uid != config_uid /* owner not the special one */
2281 (statbuf.st_gid != root_gid /* group not root */
2282 #ifdef CONFIGURE_GROUP
2283 && statbuf.st_gid != config_gid /* group not the special one */
2285 && (statbuf.st_mode & 020) != 0 /* group writeable */
2287 (statbuf.st_mode & 2) != 0) /* world writeable */
2289 trusted_config = FALSE;
2294 /* Well, the trust list at least is up to scratch... */
2295 void *reset_point = store_get(0);
2296 uschar *trusted_configs[32];
2300 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2302 uschar *start = big_buffer, *nl;
2303 while (*start && isspace(*start))
2307 nl = Ustrchr(start, '\n');
2310 trusted_configs[nr_configs++] = string_copy(start);
2311 if (nr_configs == 32)
2319 const uschar *list = argrest;
2321 while (trusted_config && (filename = string_nextinlist(&list,
2322 &sep, big_buffer, big_buffer_size)) != NULL)
2324 for (i=0; i < nr_configs; i++)
2326 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2329 if (i == nr_configs)
2331 trusted_config = FALSE;
2335 store_reset(reset_point);
2339 /* No valid prefixes found in trust_list file. */
2340 trusted_config = FALSE;
2346 /* Could not open trust_list file. */
2347 trusted_config = FALSE;
2351 /* Not root; don't trust config */
2352 trusted_config = FALSE;
2356 config_main_filelist = argrest;
2357 config_changed = TRUE;
2362 /* -D: set up a macro definition */
2365 #ifdef DISABLE_D_OPTION
2366 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2371 macro_item *mlast = NULL;
2374 uschar *s = argrest;
2376 while (isspace(*s)) s++;
2378 if (*s < 'A' || *s > 'Z')
2380 fprintf(stderr, "exim: macro name set by -D must start with "
2381 "an upper case letter\n");
2385 while (isalnum(*s) || *s == '_')
2387 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2391 if (ptr == 0) { badarg = TRUE; break; }
2392 while (isspace(*s)) s++;
2395 if (*s++ != '=') { badarg = TRUE; break; }
2396 while (isspace(*s)) s++;
2399 for (m = macros; m != NULL; m = m->next)
2401 if (Ustrcmp(m->name, name) == 0)
2403 fprintf(stderr, "exim: duplicated -D in command line\n");
2409 m = store_get(sizeof(macro_item) + Ustrlen(name));
2411 m->command_line = TRUE;
2412 if (mlast == NULL) macros = m; else mlast->next = m;
2413 Ustrcpy(m->name, name);
2414 m->replacement = string_copy(s);
2416 if (clmacro_count >= MAX_CLMACROS)
2418 fprintf(stderr, "exim: too many -D options on command line\n");
2421 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2427 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2428 The latter is now a no-op, retained for compatibility only. If -dd is used,
2429 debugging subprocesses of the daemon is disabled. */
2432 if (Ustrcmp(argrest, "ropcr") == 0)
2434 /* drop_cr = TRUE; */
2437 /* Use an intermediate variable so that we don't set debugging while
2438 decoding the debugging bits. */
2442 unsigned int selector = D_default;
2445 if (*argrest == 'd')
2447 debug_daemon = TRUE;
2451 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2452 debug_options_count, US"debug", 0);
2453 debug_selector = selector;
2458 /* -E: This is a local error message. This option is not intended for
2459 external use at all, but is not restricted to trusted callers because it
2460 does no harm (just suppresses certain error messages) and if Exim is run
2461 not setuid root it won't always be trusted when it generates error
2462 messages using this option. If there is a message id following -E, point
2463 message_reference at it, for logging. */
2466 local_error_message = TRUE;
2467 if (mac_ismsgid(argrest)) message_reference = argrest;
2471 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2472 option, so it looks as if historically the -oex options are also callable
2473 without the leading -o. So we have to accept them. Before the switch,
2474 anything starting -oe has been converted to -e. Exim does not support all
2475 of the sendmail error options. */
2478 if (Ustrcmp(argrest, "e") == 0)
2480 arg_error_handling = ERRORS_SENDER;
2481 errors_sender_rc = EXIT_SUCCESS;
2483 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2484 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2485 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2486 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2491 /* -F: Set sender's full name, used instead of the gecos entry from
2492 the password file. Since users can usually alter their gecos entries,
2493 there's no security involved in using this instead. The data can follow
2494 the -F or be in the next argument. */
2499 if(++i < argc) argrest = argv[i]; else
2500 { badarg = TRUE; break; }
2502 originator_name = argrest;
2503 sender_name_forced = TRUE;
2507 /* -f: Set sender's address - this value is only actually used if Exim is
2508 run by a trusted user, or if untrusted_set_sender is set and matches the
2509 address, except that the null address can always be set by any user. The
2510 test for this happens later, when the value given here is ignored when not
2511 permitted. For an untrusted user, the actual sender is still put in Sender:
2512 if it doesn't match the From: header (unless no_local_from_check is set).
2513 The data can follow the -f or be in the next argument. The -r switch is an
2514 obsolete form of -f but since there appear to be programs out there that
2515 use anything that sendmail has ever supported, better accept it - the
2516 synonymizing is done before the switch above.
2518 At this stage, we must allow domain literal addresses, because we don't
2519 know what the setting of allow_domain_literals is yet. Ditto for trailing
2520 dots and strip_trailing_dot. */
2524 int dummy_start, dummy_end;
2528 if (i+1 < argc) argrest = argv[++i]; else
2529 { badarg = TRUE; break; }
2532 sender_address = string_sprintf(""); /* Ensure writeable memory */
2535 uschar *temp = argrest + Ustrlen(argrest) - 1;
2536 while (temp >= argrest && isspace(*temp)) temp--;
2537 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2538 allow_domain_literals = TRUE;
2539 strip_trailing_dot = TRUE;
2540 #ifdef EXPERIMENTAL_INTERNATIONAL
2541 allow_utf8_domains = TRUE;
2543 sender_address = parse_extract_address(argrest, &errmess,
2544 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2545 #ifdef EXPERIMENTAL_INTERNATIONAL
2546 message_smtputf8 = string_is_utf8(sender_address);
2547 allow_utf8_domains = FALSE;
2549 allow_domain_literals = FALSE;
2550 strip_trailing_dot = FALSE;
2551 if (sender_address == NULL)
2553 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2554 return EXIT_FAILURE;
2557 sender_address_forced = TRUE;
2561 /* -G: sendmail invocation to specify that it's a gateway submission and
2562 sendmail may complain about problems instead of fixing them.
2563 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2564 not at this time complain about problems. */
2570 /* -h: Set the hop count for an incoming message. Exim does not currently
2571 support this; it always computes it by counting the Received: headers.
2572 To put it in will require a change to the spool header file format. */
2577 if(++i < argc) argrest = argv[i]; else
2578 { badarg = TRUE; break; }
2580 if (!isdigit(*argrest)) badarg = TRUE;
2584 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2585 not to be documented for sendmail but mailx (at least) uses it) */
2588 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2592 /* -L: set the identifier used for syslog; equivalent to setting
2593 syslog_processname in the config file, but needs to be an admin option. */
2596 if (*argrest == '\0')
2598 if(++i < argc) argrest = argv[i]; else
2599 { badarg = TRUE; break; }
2601 sz = Ustrlen(argrest);
2604 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2605 return EXIT_FAILURE;
2609 fprintf(stderr, "exim: the -L syslog name is too short\n");
2610 return EXIT_FAILURE;
2612 cmdline_syslog_name = argrest;
2616 receiving_message = FALSE;
2618 /* -MC: continue delivery of another message via an existing open
2619 file descriptor. This option is used for an internal call by the
2620 smtp transport when there is a pending message waiting to go to an
2621 address to which it has got a connection. Five subsequent arguments are
2622 required: transport name, host name, IP address, sequence number, and
2623 message_id. Transports may decline to create new processes if the sequence
2624 number gets too big. The channel is stdin. This (-MC) must be the last
2625 argument. There's a subsequent check that the real-uid is privileged.
2627 If we are running in the test harness. delay for a bit, to let the process
2628 that set this one up complete. This makes for repeatability of the logging,
2631 if (Ustrcmp(argrest, "C") == 0)
2633 union sockaddr_46 interface_sock;
2634 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2638 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2639 return EXIT_FAILURE;
2642 if (msg_action_arg >= 0)
2644 fprintf(stderr, "exim: incompatible arguments\n");
2645 return EXIT_FAILURE;
2648 continue_transport = argv[++i];
2649 continue_hostname = argv[++i];
2650 continue_host_address = argv[++i];
2651 continue_sequence = Uatoi(argv[++i]);
2652 msg_action = MSG_DELIVER;
2653 msg_action_arg = ++i;
2654 forced_delivery = TRUE;
2655 queue_run_pid = passed_qr_pid;
2656 queue_run_pipe = passed_qr_pipe;
2658 if (!mac_ismsgid(argv[i]))
2660 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2662 return EXIT_FAILURE;
2665 /* Set up $sending_ip_address and $sending_port */
2667 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2669 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2673 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2675 return EXIT_FAILURE;
2678 if (running_in_test_harness) millisleep(500);
2682 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2683 precedes -MC (see above). The flag indicates that the host to which
2684 Exim is connected has accepted an AUTH sequence. */
2686 else if (Ustrcmp(argrest, "CA") == 0)
2688 smtp_authenticated = TRUE;
2692 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2693 that exim is connected to supports the esmtp extension DSN */
2694 else if (Ustrcmp(argrest, "CD") == 0)
2696 smtp_use_dsn = TRUE;
2700 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2701 it preceded -MC (see above) */
2703 else if (Ustrcmp(argrest, "CP") == 0)
2705 smtp_use_pipelining = TRUE;
2709 /* -MCQ: pass on the pid of the queue-running process that started
2710 this chain of deliveries and the fd of its synchronizing pipe; this
2711 is useful only when it precedes -MC (see above) */
2713 else if (Ustrcmp(argrest, "CQ") == 0)
2715 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2717 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2722 /* -MCS: set the smtp_use_size flag; this is useful only when it
2723 precedes -MC (see above) */
2725 else if (Ustrcmp(argrest, "CS") == 0)
2727 smtp_use_size = TRUE;
2731 /* -MCT: set the tls_offered flag; this is useful only when it
2732 precedes -MC (see above). The flag indicates that the host to which
2733 Exim is connected has offered TLS support. */
2736 else if (Ustrcmp(argrest, "CT") == 0)
2743 /* -M[x]: various operations on the following list of message ids:
2744 -M deliver the messages, ignoring next retry times and thawing
2745 -Mc deliver the messages, checking next retry times, no thawing
2746 -Mf freeze the messages
2747 -Mg give up on the messages
2748 -Mt thaw the messages
2749 -Mrm remove the messages
2750 In the above cases, this must be the last option. There are also the
2751 following options which are followed by a single message id, and which
2752 act on that message. Some of them use the "recipient" addresses as well.
2753 -Mar add recipient(s)
2754 -Mmad mark all recipients delivered
2755 -Mmd mark recipients(s) delivered
2757 -Mset load a message for use with -be
2759 -Mvc show copy (of whole message, in RFC 2822 format)
2764 else if (*argrest == 0)
2766 msg_action = MSG_DELIVER;
2767 forced_delivery = deliver_force_thaw = TRUE;
2769 else if (Ustrcmp(argrest, "ar") == 0)
2771 msg_action = MSG_ADD_RECIPIENT;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2775 else if (Ustrcmp(argrest, "es") == 0)
2777 msg_action = MSG_EDIT_SENDER;
2778 one_msg_action = TRUE;
2780 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2781 else if (Ustrcmp(argrest, "g") == 0)
2783 msg_action = MSG_DELIVER;
2784 deliver_give_up = TRUE;
2786 else if (Ustrcmp(argrest, "mad") == 0)
2788 msg_action = MSG_MARK_ALL_DELIVERED;
2790 else if (Ustrcmp(argrest, "md") == 0)
2792 msg_action = MSG_MARK_DELIVERED;
2793 one_msg_action = TRUE;
2795 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2796 else if (Ustrcmp(argrest, "set") == 0)
2798 msg_action = MSG_LOAD;
2799 one_msg_action = TRUE;
2801 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2802 else if (Ustrcmp(argrest, "vb") == 0)
2804 msg_action = MSG_SHOW_BODY;
2805 one_msg_action = TRUE;
2807 else if (Ustrcmp(argrest, "vc") == 0)
2809 msg_action = MSG_SHOW_COPY;
2810 one_msg_action = TRUE;
2812 else if (Ustrcmp(argrest, "vh") == 0)
2814 msg_action = MSG_SHOW_HEADER;
2815 one_msg_action = TRUE;
2817 else if (Ustrcmp(argrest, "vl") == 0)
2819 msg_action = MSG_SHOW_LOG;
2820 one_msg_action = TRUE;
2822 else { badarg = TRUE; break; }
2824 /* All the -Mxx options require at least one message id. */
2826 msg_action_arg = i + 1;
2827 if (msg_action_arg >= argc)
2829 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2830 return EXIT_FAILURE;
2833 /* Some require only message ids to follow */
2835 if (!one_msg_action)
2838 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2840 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2842 return EXIT_FAILURE;
2844 goto END_ARG; /* Remaining args are ids */
2847 /* Others require only one message id, possibly followed by addresses,
2848 which will be handled as normal arguments. */
2852 if (!mac_ismsgid(argv[msg_action_arg]))
2854 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2855 argv[msg_action_arg], arg);
2856 return EXIT_FAILURE;
2863 /* Some programs seem to call the -om option without the leading o;
2864 for sendmail it askes for "me too". Exim always does this. */
2867 if (*argrest != 0) badarg = TRUE;
2871 /* -N: don't do delivery - a debugging option that stops transports doing
2872 their thing. It implies debugging at the D_v level. */
2877 dont_deliver = TRUE;
2878 debug_selector |= D_v;
2879 debug_file = stderr;
2885 /* -n: This means "don't alias" in sendmail, apparently.
2886 For normal invocations, it has no effect.
2887 It may affect some other options. */
2893 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2894 option to the specified value. This form uses long names. We need to handle
2895 -O option=value and -Ooption=value. */
2902 fprintf(stderr, "exim: string expected after -O\n");
2910 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2913 if (*argrest == 'A')
2915 alias_arg = argrest + 1;
2916 if (alias_arg[0] == 0)
2918 if (i+1 < argc) alias_arg = argv[++i]; else
2920 fprintf(stderr, "exim: string expected after -oA\n");
2926 /* -oB: Set a connection message max value for remote deliveries */
2928 else if (*argrest == 'B')
2930 uschar *p = argrest + 1;
2933 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2935 connection_max_messages = 1;
2944 fprintf(stderr, "exim: number expected after -oB\n");
2947 connection_max_messages = Uatoi(p);
2951 /* -odb: background delivery */
2953 else if (Ustrcmp(argrest, "db") == 0)
2955 synchronous_delivery = FALSE;
2956 arg_queue_only = FALSE;
2957 queue_only_set = TRUE;
2960 /* -odf: foreground delivery (smail-compatible option); same effect as
2961 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2964 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2966 synchronous_delivery = TRUE;
2967 arg_queue_only = FALSE;
2968 queue_only_set = TRUE;
2971 /* -odq: queue only */
2973 else if (Ustrcmp(argrest, "dq") == 0)
2975 synchronous_delivery = FALSE;
2976 arg_queue_only = TRUE;
2977 queue_only_set = TRUE;
2980 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2981 but no remote delivery */
2983 else if (Ustrcmp(argrest, "dqs") == 0)
2986 arg_queue_only = FALSE;
2987 queue_only_set = TRUE;
2990 /* -oex: Sendmail error flags. As these are also accepted without the
2991 leading -o prefix, for compatibility with vacation and other callers,
2992 they are handled with -e above. */
2994 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2995 -oitrue: Another sendmail syntax for the same */
2997 else if (Ustrcmp(argrest, "i") == 0 ||
2998 Ustrcmp(argrest, "itrue") == 0)
3001 /* -oM*: Set various characteristics for an incoming message; actually
3002 acted on for trusted callers only. */
3004 else if (*argrest == 'M')
3008 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3012 /* -oMa: Set sender host address */
3014 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3016 /* -oMaa: Set authenticator name */
3018 else if (Ustrcmp(argrest, "Maa") == 0)
3019 sender_host_authenticated = argv[++i];
3021 /* -oMas: setting authenticated sender */
3023 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3025 /* -oMai: setting authenticated id */
3027 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3029 /* -oMi: Set incoming interface address */
3031 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3033 /* -oMm: Message reference */
3035 else if (Ustrcmp(argrest, "Mm") == 0)
3037 if (!mac_ismsgid(argv[i+1]))
3039 fprintf(stderr,"-oMm must be a valid message ID\n");
3042 if (!trusted_config)
3044 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3047 message_reference = argv[++i];
3050 /* -oMr: Received protocol */
3052 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3054 /* -oMs: Set sender host name */
3056 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3058 /* -oMt: Set sender ident */
3060 else if (Ustrcmp(argrest, "Mt") == 0)
3062 sender_ident_set = TRUE;
3063 sender_ident = argv[++i];
3066 /* Else a bad argument */
3075 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3076 seem to call this as -m (undocumented), so that is also accepted (see
3079 else if (Ustrcmp(argrest, "m") == 0) {}
3081 /* -oo: An ancient flag for old-style addresses which still seems to
3082 crop up in some calls (see in SCO). */
3084 else if (Ustrcmp(argrest, "o") == 0) {}
3086 /* -oP <name>: set pid file path for daemon */
3088 else if (Ustrcmp(argrest, "P") == 0)
3089 override_pid_file_path = argv[++i];
3091 /* -or <n>: set timeout for non-SMTP acceptance
3092 -os <n>: set timeout for SMTP acceptance */
3094 else if (*argrest == 'r' || *argrest == 's')
3096 int *tp = (*argrest == 'r')?
3097 &arg_receive_timeout : &arg_smtp_receive_timeout;
3098 if (argrest[1] == 0)
3100 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3102 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3105 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3110 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3112 else if (Ustrcmp(argrest, "X") == 0)
3113 override_local_interfaces = argv[++i];
3115 /* Unknown -o argument */
3121 /* -ps: force Perl startup; -pd force delayed Perl startup */
3125 if (*argrest == 's' && argrest[1] == 0)
3127 perl_start_option = 1;
3130 if (*argrest == 'd' && argrest[1] == 0)
3132 perl_start_option = -1;
3137 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3138 which sets the host protocol and host name */
3142 if (i+1 < argc) argrest = argv[++i]; else
3143 { badarg = TRUE; break; }
3148 uschar *hn = Ustrchr(argrest, ':');
3151 received_protocol = argrest;
3155 received_protocol = string_copyn(argrest, hn - argrest);
3156 sender_host_name = hn + 1;
3163 receiving_message = FALSE;
3164 if (queue_interval >= 0)
3166 fprintf(stderr, "exim: -q specified more than once\n");
3170 /* -qq...: Do queue runs in a 2-stage manner */
3172 if (*argrest == 'q')
3174 queue_2stage = TRUE;
3178 /* -qi...: Do only first (initial) deliveries */
3180 if (*argrest == 'i')
3182 queue_run_first_delivery = TRUE;
3186 /* -qf...: Run the queue, forcing deliveries
3187 -qff..: Ditto, forcing thawing as well */
3189 if (*argrest == 'f')
3191 queue_run_force = TRUE;
3192 if (*(++argrest) == 'f')
3194 deliver_force_thaw = TRUE;
3199 /* -q[f][f]l...: Run the queue only on local deliveries */
3201 if (*argrest == 'l')
3203 queue_run_local = TRUE;
3207 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3208 optionally starting from a given message id. */
3210 if (*argrest == 0 &&
3211 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3214 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3215 start_queue_run_id = argv[++i];
3216 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3217 stop_queue_run_id = argv[++i];
3220 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3221 optionally local only. */
3226 queue_interval = readconf_readtime(argrest, 0, FALSE);
3228 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3229 if (queue_interval <= 0)
3231 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3238 case 'R': /* Synonymous with -qR... */
3239 receiving_message = FALSE;
3241 /* -Rf: As -R (below) but force all deliveries,
3242 -Rff: Ditto, but also thaw all frozen messages,
3243 -Rr: String is regex
3244 -Rrf: Regex and force
3245 -Rrff: Regex and force and thaw
3247 in all cases provided there are no further characters in this
3253 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3255 if (Ustrcmp(argrest, rsopts[i]) == 0)
3257 if (i != 2) queue_run_force = TRUE;
3258 if (i >= 2) deliver_selectstring_regex = TRUE;
3259 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3260 argrest += Ustrlen(rsopts[i]);
3265 /* -R: Set string to match in addresses for forced queue run to
3266 pick out particular messages. */
3270 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3272 fprintf(stderr, "exim: string expected after -R\n");
3276 else deliver_selectstring = argrest;
3280 /* -r: an obsolete synonym for -f (see above) */
3283 /* -S: Like -R but works on sender. */
3285 case 'S': /* Synonymous with -qS... */
3286 receiving_message = FALSE;
3288 /* -Sf: As -S (below) but force all deliveries,
3289 -Sff: Ditto, but also thaw all frozen messages,
3290 -Sr: String is regex
3291 -Srf: Regex and force
3292 -Srff: Regex and force and thaw
3294 in all cases provided there are no further characters in this
3300 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3302 if (Ustrcmp(argrest, rsopts[i]) == 0)
3304 if (i != 2) queue_run_force = TRUE;
3305 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3306 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3307 argrest += Ustrlen(rsopts[i]);
3312 /* -S: Set string to match in addresses for forced queue run to
3313 pick out particular messages. */
3317 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3319 fprintf(stderr, "exim: string expected after -S\n");
3323 else deliver_selectstring_sender = argrest;
3326 /* -Tqt is an option that is exclusively for use by the testing suite.
3327 It is not recognized in other circumstances. It allows for the setting up
3328 of explicit "queue times" so that various warning/retry things can be
3329 tested. Otherwise variability of clock ticks etc. cause problems. */
3332 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3333 fudged_queue_times = argv[++i];
3338 /* -t: Set flag to extract recipients from body of message. */
3341 if (*argrest == 0) extract_recipients = TRUE;
3343 /* -ti: Set flag to extract recipients from body of message, and also
3344 specify that dot does not end the message. */
3346 else if (Ustrcmp(argrest, "i") == 0)
3348 extract_recipients = TRUE;
3352 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3355 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3362 /* -U: This means "initial user submission" in sendmail, apparently. The
3363 doc claims that in future sendmail may refuse syntactically invalid
3364 messages instead of fixing them. For the moment, we just ignore it. */
3370 /* -v: verify things - this is a very low-level debugging */
3375 debug_selector |= D_v;
3376 debug_file = stderr;
3382 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3384 The -x flag tells the sendmail command that mail from a local
3385 mail program has National Language Support (NLS) extended characters
3386 in the body of the mail item. The sendmail command can send mail with
3387 extended NLS characters across networks that normally corrupts these
3390 As Exim is 8-bit clean, it just ignores this flag. */
3393 if (*argrest != 0) badarg = TRUE;
3396 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3397 logs to that file. We swallow the parameter and otherwise ignore it. */
3400 if (*argrest == '\0')
3403 fprintf(stderr, "exim: string expected after -X\n");
3409 if (*argrest == '\0')
3410 if (++i < argc) log_oneline = argv[i]; else
3412 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3417 /* All other initial characters are errors */
3422 } /* End of high-level switch statement */
3424 /* Failed to recognize the option, or syntax error */
3428 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3429 "option %s\n", arg);
3435 /* If -R or -S have been specified without -q, assume a single queue run. */
3437 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3438 queue_interval < 0) queue_interval = 0;
3442 /* If usage_wanted is set we call the usage function - which never returns */
3443 if (usage_wanted) exim_usage(called_as);
3445 /* Arguments have been processed. Check for incompatibilities. */
3447 (smtp_input || extract_recipients || recipients_arg < argc) &&
3448 (daemon_listen || queue_interval >= 0 || bi_option ||
3449 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3450 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3453 msg_action_arg > 0 &&
3454 (daemon_listen || queue_interval >= 0 || list_options ||
3455 (checking && msg_action != MSG_LOAD) ||
3456 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3459 (daemon_listen || queue_interval >= 0) &&
3460 (sender_address != NULL || list_options || list_queue || checking ||
3464 daemon_listen && queue_interval == 0
3467 inetd_wait_mode && queue_interval >= 0
3471 (checking || smtp_input || extract_recipients ||
3472 filter_test != FTEST_NONE || bi_option)
3475 verify_address_mode &&
3476 (address_test_mode || smtp_input || extract_recipients ||
3477 filter_test != FTEST_NONE || bi_option)
3480 address_test_mode && (smtp_input || extract_recipients ||
3481 filter_test != FTEST_NONE || bi_option)
3484 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3488 deliver_selectstring != NULL && queue_interval < 0
3491 msg_action == MSG_LOAD &&
3492 (!expansion_test || expansion_test_message != NULL)
3496 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3500 /* If debugging is set up, set the file and the file descriptor to pass on to
3501 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3502 to run in the foreground. */
3504 if (debug_selector != 0)
3506 debug_file = stderr;
3507 debug_fd = fileno(debug_file);
3508 background_daemon = FALSE;
3509 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3510 if (debug_selector != D_v) /* -v only doesn't show this */
3512 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3513 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3515 if (!version_printed)
3516 show_whats_supported(stderr);
3520 /* When started with root privilege, ensure that the limits on the number of
3521 open files and the number of processes (where that is accessible) are
3522 sufficiently large, or are unset, in case Exim has been called from an
3523 environment where the limits are screwed down. Not all OS have the ability to
3524 change some of these limits. */
3528 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3534 #ifdef RLIMIT_NOFILE
3535 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3537 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3539 rlp.rlim_cur = rlp.rlim_max = 0;
3542 /* I originally chose 1000 as a nice big number that was unlikely to
3543 be exceeded. It turns out that some older OS have a fixed upper limit of
3546 if (rlp.rlim_cur < 1000)
3548 rlp.rlim_cur = rlp.rlim_max = 1000;
3549 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3551 rlp.rlim_cur = rlp.rlim_max = 256;
3552 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3553 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3560 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3562 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3564 rlp.rlim_cur = rlp.rlim_max = 0;
3567 #ifdef RLIM_INFINITY
3568 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3570 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3572 if (rlp.rlim_cur < 1000)
3574 rlp.rlim_cur = rlp.rlim_max = 1000;
3576 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3577 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3583 /* Exim is normally entered as root (but some special configurations are
3584 possible that don't do this). However, it always spins off sub-processes that
3585 set their uid and gid as required for local delivery. We don't want to pass on
3586 any extra groups that root may belong to, so we want to get rid of them all at
3589 We need to obey setgroups() at this stage, before possibly giving up root
3590 privilege for a changed configuration file, but later on we might need to
3591 check on the additional groups for the admin user privilege - can't do that
3592 till after reading the config, which might specify the exim gid. Therefore,
3593 save the group list here first. */
3595 group_count = getgroups(NGROUPS_MAX, group_list);
3596 if (group_count < 0)
3598 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3602 /* There is a fundamental difference in some BSD systems in the matter of
3603 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3604 known not to be different. On the "different" systems there is a single group
3605 list, and the first entry in it is the current group. On all other versions of
3606 Unix there is a supplementary group list, which is in *addition* to the current
3607 group. Consequently, to get rid of all extraneous groups on a "standard" system
3608 you pass over 0 groups to setgroups(), while on a "different" system you pass
3609 over a single group - the current group, which is always the first group in the
3610 list. Calling setgroups() with zero groups on a "different" system results in
3611 an error return. The following code should cope with both types of system.
3613 However, if this process isn't running as root, setgroups() can't be used
3614 since you have to be root to run it, even if throwing away groups. Not being
3615 root here happens only in some unusual configurations. We just ignore the
3618 if (setgroups(0, NULL) != 0)
3620 if (setgroups(1, group_list) != 0 && !unprivileged)
3622 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3627 /* If the configuration file name has been altered by an argument on the
3628 command line (either a new file name or a macro definition) and the caller is
3629 not root, or if this is a filter testing run, remove any setuid privilege the
3630 program has and run as the underlying user.
3632 The exim user is locked out of this, which severely restricts the use of -C
3635 Otherwise, set the real ids to the effective values (should be root unless run
3636 from inetd, which it can either be root or the exim uid, if one is configured).
3638 There is a private mechanism for bypassing some of this, in order to make it
3639 possible to test lots of configurations automatically, without having either to
3640 recompile each time, or to patch in an actual configuration file name and other
3641 values (such as the path name). If running in the test harness, pretend that
3642 configuration file changes and macro definitions haven't happened. */
3645 (!trusted_config || /* Config changed, or */
3646 !macros_trusted()) && /* impermissible macros and */
3647 real_uid != root_uid && /* Not root, and */
3648 !running_in_test_harness /* Not fudged */
3650 expansion_test /* expansion testing */
3652 filter_test != FTEST_NONE) /* Filter testing */
3654 setgroups(group_count, group_list);
3655 exim_setugid(real_uid, real_gid, FALSE,
3656 US"-C, -D, -be or -bf forces real uid");
3657 removed_privilege = TRUE;
3659 /* In the normal case when Exim is called like this, stderr is available
3660 and should be used for any logging information because attempts to write
3661 to the log will usually fail. To arrange this, we unset really_exim. However,
3662 if no stderr is available there is no point - we might as well have a go
3663 at the log (if it fails, syslog will be written).
3665 Note that if the invoker is Exim, the logs remain available. Messing with
3666 this causes unlogged successful deliveries. */
3668 if ((log_stderr != NULL) && (real_uid != exim_uid))
3669 really_exim = FALSE;
3672 /* Privilege is to be retained for the moment. It may be dropped later,
3673 depending on the job that this Exim process has been asked to do. For now, set
3674 the real uid to the effective so that subsequent re-execs of Exim are done by a
3677 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3679 /* If testing a filter, open the file(s) now, before wasting time doing other
3680 setups and reading the message. */
3682 if ((filter_test & FTEST_SYSTEM) != 0)
3684 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3687 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3689 return EXIT_FAILURE;
3693 if ((filter_test & FTEST_USER) != 0)
3695 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3698 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3700 return EXIT_FAILURE;
3704 /* Initialise lookup_list
3705 If debugging, already called above via version reporting.
3706 In either case, we initialise the list of available lookups while running
3707 as root. All dynamically modules are loaded from a directory which is
3708 hard-coded into the binary and is code which, if not a module, would be
3709 part of Exim already. Ability to modify the content of the directory
3710 is equivalent to the ability to modify a setuid binary!
3712 This needs to happen before we read the main configuration. */
3715 #ifdef EXPERIMENTAL_INTERNATIONAL
3716 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3719 /* Read the main runtime configuration data; this gives up if there
3720 is a failure. It leaves the configuration file open so that the subsequent
3721 configuration data for delivery can be read if needed. */
3725 /* If an action on specific messages is requested, or if a daemon or queue
3726 runner is being started, we need to know if Exim was called by an admin user.
3727 This is the case if the real user is root or exim, or if the real group is
3728 exim, or if one of the supplementary groups is exim or a group listed in
3729 admin_groups. We don't fail all message actions immediately if not admin_user,
3730 since some actions can be performed by non-admin users. Instead, set admin_user
3731 for later interrogation. */
3733 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3738 for (i = 0; i < group_count; i++)
3740 if (group_list[i] == exim_gid) admin_user = TRUE;
3741 else if (admin_groups != NULL)
3743 for (j = 1; j <= (int)(admin_groups[0]); j++)
3744 if (admin_groups[j] == group_list[i])
3745 { admin_user = TRUE; break; }
3747 if (admin_user) break;
3751 /* Another group of privileged users are the trusted users. These are root,
3752 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3753 are permitted to specify sender_addresses with -f on the command line, and
3754 other message parameters as well. */
3756 if (real_uid == root_uid || real_uid == exim_uid)
3757 trusted_caller = TRUE;
3762 if (trusted_users != NULL)
3764 for (i = 1; i <= (int)(trusted_users[0]); i++)
3765 if (trusted_users[i] == real_uid)
3766 { trusted_caller = TRUE; break; }
3769 if (!trusted_caller && trusted_groups != NULL)
3771 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3773 if (trusted_groups[i] == real_gid)
3774 trusted_caller = TRUE;
3775 else for (j = 0; j < group_count; j++)
3777 if (trusted_groups[i] == group_list[j])
3778 { trusted_caller = TRUE; break; }
3780 if (trusted_caller) break;
3785 /* Handle the decoding of logging options. */
3787 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3788 log_selector_string, log_options, log_options_count, US"log", 0);
3792 debug_printf("configuration file is %s\n", config_main_filename);
3793 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3794 log_extra_selector);
3797 /* If domain literals are not allowed, check the sender address that was
3798 supplied with -f. Ditto for a stripped trailing dot. */
3800 if (sender_address != NULL)
3802 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3804 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3805 "allowed\n", sender_address);
3806 return EXIT_FAILURE;
3808 if (f_end_dot && !strip_trailing_dot)
3810 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3811 "(trailing dot not allowed)\n", sender_address);
3812 return EXIT_FAILURE;
3816 /* See if an admin user overrode our logging. */
3818 if (cmdline_syslog_name != NULL)
3822 syslog_processname = cmdline_syslog_name;
3823 log_file_path = string_copy(CUS"syslog");
3827 /* not a panic, non-privileged users should not be able to spam paniclog */
3829 "exim: you lack sufficient privilege to specify syslog process name\n");
3830 return EXIT_FAILURE;
3834 /* Paranoia check of maximum lengths of certain strings. There is a check
3835 on the length of the log file path in log.c, which will come into effect
3836 if there are any calls to write the log earlier than this. However, if we
3837 get this far but the string is very long, it is better to stop now than to
3838 carry on and (e.g.) receive a message and then have to collapse. The call to
3839 log_write() from here will cause the ultimate panic collapse if the complete
3840 file name exceeds the buffer length. */
3842 if (Ustrlen(log_file_path) > 200)
3843 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3844 "log_file_path is longer than 200 chars: aborting");
3846 if (Ustrlen(pid_file_path) > 200)
3847 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3848 "pid_file_path is longer than 200 chars: aborting");
3850 if (Ustrlen(spool_directory) > 200)
3851 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3852 "spool_directory is longer than 200 chars: aborting");
3854 /* Length check on the process name given to syslog for its TAG field,
3855 which is only permitted to be 32 characters or less. See RFC 3164. */
3857 if (Ustrlen(syslog_processname) > 32)
3858 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3859 "syslog_processname is longer than 32 chars: aborting");
3865 log_write(0, LOG_MAIN, "%s", log_oneline);
3866 return EXIT_SUCCESS;
3869 return EXIT_FAILURE;
3872 /* In some operating systems, the environment variable TMPDIR controls where
3873 temporary files are created; Exim doesn't use these (apart from when delivering
3874 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3875 If TMPDIR is found in the environment, reset it to the value defined in the
3876 TMPDIR macro, if this macro is defined. */
3881 for (p = USS environ; *p != NULL; p++)
3883 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3884 Ustrcmp(*p+7, TMPDIR) != 0)
3886 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3887 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3889 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3895 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3896 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3897 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3898 called by a user who has set the TZ variable. This then affects the timestamps
3899 in log files and in Received: headers, and any created Date: header lines. The
3900 required timezone is settable in the configuration file, so nothing can be done
3901 about this earlier - but hopefully nothing will normally be logged earlier than
3902 this. We have to make a new environment if TZ is wrong, but don't bother if
3903 timestamps_utc is set, because then all times are in UTC anyway. */
3905 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3907 timestamps_utc = TRUE;
3911 uschar *envtz = US getenv("TZ");
3912 if ((envtz == NULL && timezone_string != NULL) ||
3914 (timezone_string == NULL ||
3915 Ustrcmp(timezone_string, envtz) != 0)))
3917 uschar **p = USS environ;
3921 while (*p++ != NULL) count++;
3922 if (envtz == NULL) count++;
3923 newp = new = malloc(sizeof(uschar *) * (count + 1));
3924 for (p = USS environ; *p != NULL; p++)
3926 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3929 if (timezone_string != NULL)
3931 *newp = malloc(Ustrlen(timezone_string) + 4);
3932 sprintf(CS *newp++, "TZ=%s", timezone_string);
3937 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3938 tod_stamp(tod_log));
3942 /* Handle the case when we have removed the setuid privilege because of -C or
3943 -D. This means that the caller of Exim was not root.
3945 There is a problem if we were running as the Exim user. The sysadmin may
3946 expect this case to retain privilege because "the binary was called by the
3947 Exim user", but it hasn't, because either the -D option set macros, or the
3948 -C option set a non-trusted configuration file. There are two possibilities:
3950 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3951 to do message deliveries. Thus, the fact that it is running as a
3952 non-privileged user is plausible, and might be wanted in some special
3953 configurations. However, really_exim will have been set false when
3954 privilege was dropped, to stop Exim trying to write to its normal log
3955 files. Therefore, re-enable normal log processing, assuming the sysadmin
3956 has set up the log directory correctly.
3958 (2) If deliver_drop_privilege is not set, the configuration won't work as
3959 apparently intended, and so we log a panic message. In order to retain
3960 root for -C or -D, the caller must either be root or be invoking a
3961 trusted configuration file (when deliver_drop_privilege is false). */
3963 if (removed_privilege && (!trusted_config || macros != NULL) &&
3964 real_uid == exim_uid)
3966 if (deliver_drop_privilege)
3967 really_exim = TRUE; /* let logging work normally */
3969 log_write(0, LOG_MAIN|LOG_PANIC,
3970 "exim user lost privilege for using %s option",
3971 trusted_config? "-D" : "-C");
3974 /* Start up Perl interpreter if Perl support is configured and there is a
3975 perl_startup option, and the configuration or the command line specifies
3976 initializing starting. Note that the global variables are actually called
3977 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3980 if (perl_start_option != 0)
3981 opt_perl_at_start = (perl_start_option > 0);
3982 if (opt_perl_at_start && opt_perl_startup != NULL)
3985 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3986 errstr = init_perl(opt_perl_startup);
3989 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3990 return EXIT_FAILURE;
3992 opt_perl_started = TRUE;
3994 #endif /* EXIM_PERL */
3996 /* Log the arguments of the call if the configuration file said so. This is
3997 a debugging feature for finding out what arguments certain MUAs actually use.
3998 Don't attempt it if logging is disabled, or if listing variables or if
3999 verifying/testing addresses or expansions. */
4001 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
4002 && really_exim && !list_options && !checking)
4005 uschar *p = big_buffer;
4007 Ustrcpy(p, "cwd= (failed)");
4008 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4010 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4012 for (i = 0; i < argc; i++)
4014 int len = Ustrlen(argv[i]);
4015 const uschar *printing;
4017 if (p + len + 8 >= big_buffer + big_buffer_size)
4020 log_write(0, LOG_MAIN, "%s", big_buffer);
4021 Ustrcpy(big_buffer, "...");
4024 printing = string_printing(argv[i]);
4025 if (printing[0] == 0) quote = US"\""; else
4027 const uschar *pp = printing;
4029 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4031 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4032 (p - big_buffer) - 4), printing, quote);
4036 if ((log_extra_selector & LX_arguments) != 0)
4037 log_write(0, LOG_MAIN, "%s", big_buffer);
4039 debug_printf("%s\n", big_buffer);
4042 /* Set the working directory to be the top-level spool directory. We don't rely
4043 on this in the code, which always uses fully qualified names, but it's useful
4044 for core dumps etc. Don't complain if it fails - the spool directory might not
4045 be generally accessible and calls with the -C option (and others) have lost
4046 privilege by now. Before the chdir, we try to ensure that the directory exists.
4049 if (Uchdir(spool_directory) != 0)
4052 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4053 dummy = /* quieten compiler */ Uchdir(spool_directory);
4056 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4057 alias file. Exim doesn't have such a concept, but this call is screwed into
4058 Sun's YP makefiles. Handle this by calling a configured script, as the real
4059 user who called Exim. The -oA option can be used to pass an argument to the
4064 (void)fclose(config_file);
4065 if (bi_command != NULL)
4069 argv[i++] = bi_command;
4070 if (alias_arg != NULL) argv[i++] = alias_arg;
4073 setgroups(group_count, group_list);
4074 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4076 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4077 (argv[1] == NULL)? US"" : argv[1]);
4079 execv(CS argv[0], (char *const *)argv);
4080 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4085 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4090 /* We moved the admin/trusted check to be immediately after reading the
4091 configuration file. We leave these prints here to ensure that syslog setup,
4092 logfile setup, and so on has already happened. */
4094 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4095 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4097 /* Only an admin user may start the daemon or force a queue run in the default
4098 configuration, but the queue run restriction can be relaxed. Only an admin
4099 user may request that a message be returned to its sender forthwith. Only an
4100 admin user may specify a debug level greater than D_v (because it might show
4101 passwords, etc. in lookup queries). Only an admin user may request a queue
4102 count. Only an admin user can use the test interface to scan for email
4103 (because Exim will be in the spool dir and able to look at mails). */
4107 BOOL debugset = (debug_selector & ~D_v) != 0;
4108 if (deliver_give_up || daemon_listen || malware_test_file ||
4109 (count_queue && queue_list_requires_admin) ||
4110 (list_queue && queue_list_requires_admin) ||
4111 (queue_interval >= 0 && prod_requires_admin) ||
4112 (debugset && !running_in_test_harness))
4114 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4119 /* If the real user is not root or the exim uid, the argument for passing
4120 in an open TCP/IP connection for another message is not permitted, nor is
4121 running with the -N option for any delivery action, unless this call to exim is
4122 one that supplied an input message, or we are using a patched exim for
4123 regression testing. */
4125 if (real_uid != root_uid && real_uid != exim_uid &&
4126 (continue_hostname != NULL ||
4128 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4129 )) && !running_in_test_harness)
4131 fprintf(stderr, "exim: Permission denied\n");
4132 return EXIT_FAILURE;
4135 /* If the caller is not trusted, certain arguments are ignored when running for
4136 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4137 Note that authority for performing certain actions on messages is tested in the
4138 queue_action() function. */
4140 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4142 sender_host_name = sender_host_address = interface_address =
4143 sender_ident = received_protocol = NULL;
4144 sender_host_port = interface_port = 0;
4145 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4148 /* If a sender host address is set, extract the optional port number off the
4149 end of it and check its syntax. Do the same thing for the interface address.
4150 Exim exits if the syntax is bad. */
4154 if (sender_host_address != NULL)
4155 sender_host_port = check_port(sender_host_address);
4156 if (interface_address != NULL)
4157 interface_port = check_port(interface_address);
4160 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4165 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4166 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4170 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4171 return EXIT_FAILURE;
4175 /* If an SMTP message is being received check to see if the standard input is a
4176 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4177 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4182 union sockaddr_46 inetd_sock;
4183 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4184 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4186 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4187 if (family == AF_INET || family == AF_INET6)
4189 union sockaddr_46 interface_sock;
4190 size = sizeof(interface_sock);
4192 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4193 interface_address = host_ntoa(-1, &interface_sock, NULL,
4196 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4198 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4201 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4202 NULL, &sender_host_port);
4203 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4204 "inetd is not supported when mua_wrapper is set");
4209 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4210 return EXIT_FAILURE;
4216 /* If the load average is going to be needed while receiving a message, get it
4217 now for those OS that require the first call to os_getloadavg() to be done as
4218 root. There will be further calls later for each message received. */
4220 #ifdef LOAD_AVG_NEEDS_ROOT
4221 if (receiving_message &&
4222 (queue_only_load >= 0 ||
4223 (is_inetd && smtp_load_reserve >= 0)
4226 load_average = OS_GETLOADAVG();
4230 /* The queue_only configuration option can be overridden by -odx on the command
4231 line, except that if queue_only_override is false, queue_only cannot be unset
4232 from the command line. */
4234 if (queue_only_set && (queue_only_override || arg_queue_only))
4235 queue_only = arg_queue_only;
4237 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4240 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4241 if (arg_smtp_receive_timeout >= 0)
4242 smtp_receive_timeout = arg_smtp_receive_timeout;
4244 /* If Exim was started with root privilege, unless we have already removed the
4245 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4246 except when starting the daemon or doing some kind of delivery or address
4247 testing (-bt). These are the only cases when root need to be retained. We run
4248 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4249 retained only for starting the daemon. We always do the initgroups() in this
4250 situation (controlled by the TRUE below), in order to be as close as possible
4251 to the state Exim usually runs in. */
4253 if (!unprivileged && /* originally had root AND */
4254 !removed_privilege && /* still got root AND */
4255 !daemon_listen && /* not starting the daemon */
4256 queue_interval <= 0 && /* (either kind of daemon) */
4258 deliver_drop_privilege || /* requested unprivileged */
4260 queue_interval < 0 && /* not running the queue */
4261 (msg_action_arg < 0 || /* and */
4262 msg_action != MSG_DELIVER) && /* not delivering and */
4263 (!checking || !address_test_mode) /* not address checking */
4267 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4270 /* When we are retaining a privileged uid, we still change to the exim gid. */
4275 rv = setgid(exim_gid);
4276 /* Impact of failure is that some stuff might end up with an incorrect group.
4277 We track this for failures from root, since any attempt to change privilege
4278 by root should succeed and failures should be examined. For non-root,
4279 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4280 no need to complain then. */
4283 if (!(unprivileged || removed_privilege))
4286 "exim: changing group failed: %s\n", strerror(errno));
4290 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4291 (long int)exim_gid, strerror(errno));
4295 /* Handle a request to scan a file for malware */
4296 if (malware_test_file)
4298 #ifdef WITH_CONTENT_SCAN
4300 set_process_info("scanning file for malware");
4301 result = malware_in_file(malware_test_file);
4304 printf("No malware found.\n");
4309 printf("Malware lookup returned non-okay/fail: %d\n", result);
4313 printf("Malware found: %s\n", malware_name);
4315 printf("Malware scan detected malware of unknown name.\n");
4317 printf("Malware scanning not enabled at compile time.\n");
4322 /* Handle a request to list the delivery queue */
4326 set_process_info("listing the queue");
4327 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4331 /* Handle a request to count the delivery queue */
4335 set_process_info("counting the queue");
4340 /* Handle actions on specific messages, except for the force delivery and
4341 message load actions, which are done below. Some actions take a whole list of
4342 message ids, which are known to continue up to the end of the arguments. Others
4343 take a single message id and then operate on the recipients list. */
4345 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4347 int yield = EXIT_SUCCESS;
4348 set_process_info("acting on specified messages");
4350 if (!one_msg_action)
4352 for (i = msg_action_arg; i < argc; i++)
4353 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4354 yield = EXIT_FAILURE;
4357 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4358 recipients_arg)) yield = EXIT_FAILURE;
4362 /* We used to set up here to skip reading the ACL section, on
4363 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4364 Now, since the intro of the ${acl } expansion, ACL definitions may be
4365 needed in transports so we lost the optimisation. */
4369 /* The configuration data will have been read into POOL_PERM because we won't
4370 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4371 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4372 configuration were read into POOL_MAIN, because we don't do any resets till
4373 later on. However, it seems right, and it does ensure that both pools get used.
4376 store_pool = POOL_MAIN;
4378 /* Handle the -brt option. This is for checking out retry configurations.
4379 The next three arguments are a domain name or a complete address, and
4380 optionally two error numbers. All it does is to call the function that
4381 scans the retry configuration data. */
4383 if (test_retry_arg >= 0)
4385 retry_config *yield;
4386 int basic_errno = 0;
4390 if (test_retry_arg >= argc)
4392 printf("-brt needs a domain or address argument\n");
4393 exim_exit(EXIT_FAILURE);
4395 s1 = argv[test_retry_arg++];
4398 /* If the first argument contains no @ and no . it might be a local user
4399 or it might be a single-component name. Treat as a domain. */
4401 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4403 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4404 "being \ntreated as a one-component domain, not as a local part.\n\n",
4408 /* There may be an optional second domain arg. */
4410 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4411 s2 = argv[test_retry_arg++];
4413 /* The final arg is an error name */
4415 if (test_retry_arg < argc)
4417 uschar *ss = argv[test_retry_arg];
4419 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4422 printf("%s\n", CS error);
4423 return EXIT_FAILURE;
4426 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4427 code > 100 as an error is for matching codes to the decade. Turn them into
4428 a real error code, off the decade. */
4430 if (basic_errno == ERRNO_MAIL4XX ||
4431 basic_errno == ERRNO_RCPT4XX ||
4432 basic_errno == ERRNO_DATA4XX)
4434 int code = (more_errno >> 8) & 255;
4436 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4437 else if (code > 100)
4438 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4442 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4443 if (yield == NULL) printf("No retry information found\n"); else
4446 more_errno = yield->more_errno;
4447 printf("Retry rule: %s ", yield->pattern);
4449 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4451 printf("quota%s%s ",
4452 (more_errno > 0)? "_" : "",
4453 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4455 else if (yield->basic_errno == ECONNREFUSED)
4457 printf("refused%s%s ",
4458 (more_errno > 0)? "_" : "",
4459 (more_errno == 'M')? "MX" :
4460 (more_errno == 'A')? "A" : "");
4462 else if (yield->basic_errno == ETIMEDOUT)
4465 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4467 if (more_errno != 0) printf("_%s",
4468 (more_errno == 'M')? "MX" : "A");
4471 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4472 printf("auth_failed ");
4475 for (r = yield->rules; r != NULL; r = r->next)
4477 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4478 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4484 printf(",%d.", x/1000);
4498 exim_exit(EXIT_SUCCESS);
4501 /* Handle a request to list one or more configuration options */
4502 /* If -n was set, we suppress some information */
4506 set_process_info("listing variables");
4507 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4508 else for (i = recipients_arg; i < argc; i++)
4511 (Ustrcmp(argv[i], "router") == 0 ||
4512 Ustrcmp(argv[i], "transport") == 0 ||
4513 Ustrcmp(argv[i], "authenticator") == 0 ||
4514 Ustrcmp(argv[i], "macro") == 0))
4516 readconf_print(argv[i+1], argv[i], flag_n);
4519 else readconf_print(argv[i], NULL, flag_n);
4521 exim_exit(EXIT_SUCCESS);
4525 /* Handle a request to deliver one or more messages that are already on the
4526 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4527 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4529 Delivery of specific messages is typically used for a small number when
4530 prodding by hand (when the option forced_delivery will be set) or when
4531 re-execing to regain root privilege. Each message delivery must happen in a
4532 separate process, so we fork a process for each one, and run them sequentially
4533 so that debugging output doesn't get intertwined, and to avoid spawning too
4534 many processes if a long list is given. However, don't fork for the last one;
4535 this saves a process in the common case when Exim is called to deliver just one
4538 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4540 if (prod_requires_admin && !admin_user)
4542 fprintf(stderr, "exim: Permission denied\n");
4543 exim_exit(EXIT_FAILURE);
4545 set_process_info("delivering specified messages");
4546 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4547 for (i = msg_action_arg; i < argc; i++)
4552 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4553 else if ((pid = fork()) == 0)
4555 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4556 _exit(EXIT_SUCCESS);
4560 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4562 exim_exit(EXIT_FAILURE);
4566 exim_exit(EXIT_SUCCESS);
4570 /* If only a single queue run is requested, without SMTP listening, we can just
4571 turn into a queue runner, with an optional starting message id. */
4573 if (queue_interval == 0 && !daemon_listen)
4575 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4576 (start_queue_run_id == NULL)? US"" : US" starting at ",
4577 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4578 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4579 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4580 set_process_info("running the queue (single queue run)");
4581 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4582 exim_exit(EXIT_SUCCESS);
4586 /* Find the login name of the real user running this process. This is always
4587 needed when receiving a message, because it is written into the spool file. It
4588 may also be used to construct a from: or a sender: header, and in this case we
4589 need the user's full name as well, so save a copy of it, checked for RFC822
4590 syntax and munged if necessary, if it hasn't previously been set by the -F
4591 argument. We may try to get the passwd entry more than once, in case NIS or
4592 other delays are in evidence. Save the home directory for use in filter testing
4597 if ((pw = getpwuid(real_uid)) != NULL)
4599 originator_login = string_copy(US pw->pw_name);
4600 originator_home = string_copy(US pw->pw_dir);
4602 /* If user name has not been set by -F, set it from the passwd entry
4603 unless -f has been used to set the sender address by a trusted user. */
4605 if (originator_name == NULL)
4607 if (sender_address == NULL ||
4608 (!trusted_caller && filter_test == FTEST_NONE))
4610 uschar *name = US pw->pw_gecos;
4611 uschar *amp = Ustrchr(name, '&');
4614 /* Most Unix specify that a '&' character in the gecos field is
4615 replaced by a copy of the login name, and some even specify that
4616 the first character should be upper cased, so that's what we do. */
4621 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4622 amp - name, name, &loffset, originator_login, amp + 1);
4623 buffer[loffset] = toupper(buffer[loffset]);
4627 /* If a pattern for matching the gecos field was supplied, apply
4628 it and then expand the name string. */
4630 if (gecos_pattern != NULL && gecos_name != NULL)
4633 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4635 if (regex_match_and_setup(re, name, 0, -1))
4637 uschar *new_name = expand_string(gecos_name);
4639 if (new_name != NULL)
4641 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4642 "gecos field \"%s\"\n", new_name, name);
4645 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4646 "\"%s\": %s\n", gecos_name, expand_string_message);
4648 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4649 "gecos field \"%s\"\n", gecos_pattern, name);
4650 store_free((void *)re);
4652 originator_name = string_copy(name);
4655 /* A trusted caller has used -f but not -F */
4657 else originator_name = US"";
4660 /* Break the retry loop */
4665 if (++i > finduser_retries) break;
4669 /* If we cannot get a user login, log the incident and give up, unless the
4670 configuration specifies something to use. When running in the test harness,
4671 any setting of unknown_login overrides the actual name. */
4673 if (originator_login == NULL || running_in_test_harness)
4675 if (unknown_login != NULL)
4677 originator_login = expand_string(unknown_login);
4678 if (originator_name == NULL && unknown_username != NULL)
4679 originator_name = expand_string(unknown_username);
4680 if (originator_name == NULL) originator_name = US"";
4682 if (originator_login == NULL)
4683 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4687 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4690 originator_name = string_copy(parse_fix_phrase(originator_name,
4691 Ustrlen(originator_name), big_buffer, big_buffer_size));
4693 /* If a message is created by this call of Exim, the uid/gid of its originator
4694 are those of the caller. These values are overridden if an existing message is
4695 read in from the spool. */
4697 originator_uid = real_uid;
4698 originator_gid = real_gid;
4700 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4701 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4703 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4704 returns. We leave this till here so that the originator_ fields are available
4705 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4708 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4712 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4713 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4714 "mua_wrapper is set");
4719 /* If the sender ident has not been set (by a trusted caller) set it to
4720 the caller. This will get overwritten below for an inetd call. If a trusted
4721 caller has set it empty, unset it. */
4723 if (sender_ident == NULL) sender_ident = originator_login;
4724 else if (sender_ident[0] == 0) sender_ident = NULL;
4726 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4727 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4728 originator_* variables set. */
4730 if (test_rewrite_arg >= 0)
4732 really_exim = FALSE;
4733 if (test_rewrite_arg >= argc)
4735 printf("-brw needs an address argument\n");
4736 exim_exit(EXIT_FAILURE);
4738 rewrite_test(argv[test_rewrite_arg]);
4739 exim_exit(EXIT_SUCCESS);
4742 /* A locally-supplied message is considered to be coming from a local user
4743 unless a trusted caller supplies a sender address with -f, or is passing in the
4744 message via SMTP (inetd invocation or otherwise). */
4746 if ((sender_address == NULL && !smtp_input) ||
4747 (!trusted_caller && filter_test == FTEST_NONE))
4749 sender_local = TRUE;
4751 /* A trusted caller can supply authenticated_sender and authenticated_id
4752 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4753 defaults except when host checking. */
4755 if (authenticated_sender == NULL && !host_checking)
4756 authenticated_sender = string_sprintf("%s@%s", originator_login,
4757 qualify_domain_sender);
4758 if (authenticated_id == NULL && !host_checking)
4759 authenticated_id = originator_login;
4762 /* Trusted callers are always permitted to specify the sender address.
4763 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4764 is specified is the empty address. However, if a trusted caller does not
4765 specify a sender address for SMTP input, we leave sender_address unset. This
4766 causes the MAIL commands to be honoured. */
4768 if ((!smtp_input && sender_address == NULL) ||
4769 !receive_check_set_sender(sender_address))
4771 /* Either the caller is not permitted to set a general sender, or this is
4772 non-SMTP input and the trusted caller has not set a sender. If there is no
4773 sender, or if a sender other than <> is set, override with the originator's
4774 login (which will get qualified below), except when checking things. */
4776 if (sender_address == NULL /* No sender_address set */
4778 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4779 !checking && /* Not running tests, AND */
4780 filter_test == FTEST_NONE)) /* Not testing a filter */
4782 sender_address = originator_login;
4783 sender_address_forced = FALSE;
4784 sender_address_domain = 0;
4788 /* Remember whether an untrusted caller set the sender address */
4790 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4792 /* Ensure that the sender address is fully qualified unless it is the empty
4793 address, which indicates an error message, or doesn't exist (root caller, smtp
4794 interface, no -f argument). */
4796 if (sender_address != NULL && sender_address[0] != 0 &&
4797 sender_address_domain == 0)
4798 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4799 qualify_domain_sender);
4801 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4803 /* Handle a request to verify a list of addresses, or test them for delivery.
4804 This must follow the setting of the sender address, since routers can be
4805 predicated upon the sender. If no arguments are given, read addresses from
4806 stdin. Set debug_level to at least D_v to get full output for address testing.
4809 if (verify_address_mode || address_test_mode)
4812 int flags = vopt_qualify;
4814 if (verify_address_mode)
4816 if (!verify_as_sender) flags |= vopt_is_recipient;
4817 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4822 flags |= vopt_is_recipient;
4823 debug_selector |= D_v;
4824 debug_file = stderr;
4825 debug_fd = fileno(debug_file);
4826 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4829 if (recipients_arg < argc)
4831 while (recipients_arg < argc)
4833 uschar *s = argv[recipients_arg++];
4836 BOOL finished = FALSE;
4837 uschar *ss = parse_find_address_end(s, FALSE);
4838 if (*ss == ',') *ss = 0; else finished = TRUE;
4839 test_address(s, flags, &exit_value);
4842 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4849 uschar *s = get_stdinput(NULL, NULL);
4850 if (s == NULL) break;
4851 test_address(s, flags, &exit_value);
4855 exim_exit(exit_value);
4858 /* Handle expansion checking. Either expand items on the command line, or read
4859 from stdin if there aren't any. If -Mset was specified, load the message so
4860 that its variables can be used, but restrict this facility to admin users.
4861 Otherwise, if -bem was used, read a message from stdin. */
4865 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4867 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4870 fprintf(stderr, "exim: permission denied\n");
4873 message_id = argv[msg_action_arg];
4874 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4875 if (!spool_open_datafile(message_id))
4876 printf ("Failed to load message datafile %s\n", message_id);
4877 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4878 printf ("Failed to load message %s\n", message_id);
4881 /* Read a test message from a file. We fudge it up to be on stdin, saving
4882 stdin itself for later reading of expansion strings. */
4884 else if (expansion_test_message != NULL)
4886 int save_stdin = dup(0);
4887 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4890 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4892 return EXIT_FAILURE;
4895 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4896 message_ended = END_NOTENDED;
4897 read_message_body(receive_msg(extract_recipients));
4898 message_linecount += body_linecount;
4899 (void)dup2(save_stdin, 0);
4900 (void)close(save_stdin);
4901 clearerr(stdin); /* Required by Darwin */
4904 /* Allow $recipients for this testing */
4906 enable_dollar_recipients = TRUE;
4908 /* Expand command line items */
4910 if (recipients_arg < argc)
4912 while (recipients_arg < argc)
4914 uschar *s = argv[recipients_arg++];
4915 uschar *ss = expand_string(s);
4916 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4917 else printf("%s\n", CS ss);
4925 char *(*fn_readline)(const char *) = NULL;
4926 void (*fn_addhist)(const char *) = NULL;
4929 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4935 uschar *source = get_stdinput(fn_readline, fn_addhist);
4936 if (source == NULL) break;
4937 ss = expand_string(source);
4939 printf ("Failed: %s\n", expand_string_message);
4940 else printf("%s\n", CS ss);
4944 if (dlhandle != NULL) dlclose(dlhandle);
4948 /* The data file will be open after -Mset */
4950 if (deliver_datafile >= 0)
4952 (void)close(deliver_datafile);
4953 deliver_datafile = -1;
4956 exim_exit(EXIT_SUCCESS);
4960 /* The active host name is normally the primary host name, but it can be varied
4961 for hosts that want to play several parts at once. We need to ensure that it is
4962 set for host checking, and for receiving messages. */
4964 smtp_active_hostname = primary_hostname;
4965 if (raw_active_hostname != NULL)
4967 uschar *nah = expand_string(raw_active_hostname);
4970 if (!expand_string_forcedfail)
4971 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4972 "(smtp_active_hostname): %s", raw_active_hostname,
4973 expand_string_message);
4975 else if (nah[0] != 0) smtp_active_hostname = nah;
4978 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4979 given IP address so that the blocking and relay configuration can be tested.
4980 Unless a sender_ident was set by -oMt, we discard it (the default is the
4981 caller's login name). An RFC 1413 call is made only if we are running in the
4982 test harness and an incoming interface and both ports are specified, because
4983 there is no TCP/IP call to find the ident for. */
4990 if (!sender_ident_set)
4992 sender_ident = NULL;
4993 if (running_in_test_harness && sender_host_port != 0 &&
4994 interface_address != NULL && interface_port != 0)
4995 verify_get_ident(1413);
4998 /* In case the given address is a non-canonical IPv6 address, canonicize
4999 it. The code works for both IPv4 and IPv6, as it happens. */
5001 size = host_aton(sender_host_address, x);
5002 sender_host_address = store_get(48); /* large enough for full IPv6 */
5003 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5005 /* Now set up for testing */
5007 host_build_sender_fullhost();
5011 sender_local = FALSE;
5012 sender_host_notsocket = TRUE;
5013 debug_file = stderr;
5014 debug_fd = fileno(debug_file);
5015 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5016 "**** but without any ident (RFC 1413) callback.\n"
5017 "**** This is not for real!\n\n",
5018 sender_host_address);
5020 if (verify_check_host(&hosts_connection_nolog) == OK)
5021 log_write_selector &= ~L_smtp_connection;
5022 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5024 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5025 because a log line has already been written for all its failure exists
5026 (usually "connection refused: <reason>") and writing another one is
5027 unnecessary clutter. */
5029 if (smtp_start_session())
5031 reset_point = store_get(0);
5034 store_reset(reset_point);
5035 if (smtp_setup_msg() <= 0) break;
5036 if (!receive_msg(FALSE)) break;
5040 exim_exit(EXIT_SUCCESS);
5044 /* Arrange for message reception if recipients or SMTP were specified;
5045 otherwise complain unless a version print (-bV) happened or this is a filter
5046 verification test or info dump.
5047 In the former case, show the configuration file name. */
5049 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5051 if (version_printed)
5053 printf("Configuration file is %s\n", config_main_filename);
5054 return EXIT_SUCCESS;
5057 if (info_flag != CMDINFO_NONE)
5059 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5060 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5063 if (filter_test == FTEST_NONE)
5064 exim_usage(called_as);
5068 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5069 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5070 that we are not called from inetd, because that is rejected above. The
5071 following configuration settings are forced here:
5073 (1) Synchronous delivery (-odi)
5074 (2) Errors to stderr (-oep == -oeq)
5075 (3) No parallel remote delivery
5076 (4) Unprivileged delivery
5078 We don't force overall queueing options because there are several of them;
5079 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5080 to override any SMTP queueing. */
5084 synchronous_delivery = TRUE;
5085 arg_error_handling = ERRORS_STDERR;
5086 remote_max_parallel = 1;
5087 deliver_drop_privilege = TRUE;
5089 queue_smtp_domains = NULL;
5090 #ifdef EXPERIMENTAL_INTERNATIONAL
5091 message_utf8_downconvert = -1; /* convert-if-needed */
5096 /* Prepare to accept one or more new messages on the standard input. When a
5097 message has been read, its id is returned in message_id[]. If doing immediate
5098 delivery, we fork a delivery process for each received message, except for the
5099 last one, where we can save a process switch.
5101 It is only in non-smtp mode that error_handling is allowed to be changed from
5102 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5103 sendmail error modes other than -oem ever actually used? Later: yes.) */
5105 if (!smtp_input) error_handling = arg_error_handling;
5107 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5108 logging being sent down the socket and make an identd call to get the
5113 (void)fclose(stderr);
5114 exim_nullstd(); /* Re-open to /dev/null */
5115 verify_get_ident(IDENT_PORT);
5116 host_build_sender_fullhost();
5117 set_process_info("handling incoming connection from %s via inetd",
5121 /* If the sender host address has been set, build sender_fullhost if it hasn't
5122 already been done (which it will have been for inetd). This caters for the
5123 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5124 so that the test for IP options is skipped for -bs input. */
5126 if (sender_host_address != NULL && sender_fullhost == NULL)
5128 host_build_sender_fullhost();
5129 set_process_info("handling incoming connection from %s via -oMa",
5131 sender_host_notsocket = TRUE;
5134 /* Otherwise, set the sender host as unknown except for inetd calls. This
5135 prevents host checking in the case of -bs not from inetd and also for -bS. */
5137 else if (!is_inetd) sender_host_unknown = TRUE;
5139 /* If stdout does not exist, then dup stdin to stdout. This can happen
5140 if exim is started from inetd. In this case fd 0 will be set to the socket,
5141 but fd 1 will not be set. This also happens for passed SMTP channels. */
5143 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5145 /* Set up the incoming protocol name and the state of the program. Root is
5146 allowed to force received protocol via the -oMr option above. If we have come
5147 via inetd, the process info has already been set up. We don't set
5148 received_protocol here for smtp input, as it varies according to
5149 batch/HELO/EHLO/AUTH/TLS. */
5153 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5154 smtp_batched_input? "batched " : "",
5155 (sender_address!= NULL)? sender_address : originator_login);
5159 if (received_protocol == NULL)
5160 received_protocol = string_sprintf("local%s", called_as);
5161 set_process_info("accepting a local non-SMTP message from <%s>",
5165 /* Initialize the session_local_queue-only flag (this will be ignored if
5166 mua_wrapper is set) */
5169 session_local_queue_only = queue_only;
5171 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5172 the spool if so configured. On failure, we must not attempt to send an error
5173 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5174 error code is given.) */
5176 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5178 fprintf(stderr, "exim: insufficient disk space\n");
5179 return EXIT_FAILURE;
5182 /* If this is smtp input of any kind, real or batched, handle the start of the
5185 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5186 because a log line has already been written for all its failure exists
5187 (usually "connection refused: <reason>") and writing another one is
5188 unnecessary clutter. */
5194 if (verify_check_host(&hosts_connection_nolog) == OK)
5195 log_write_selector &= ~L_smtp_connection;
5196 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5197 if (!smtp_start_session())
5200 exim_exit(EXIT_SUCCESS);
5204 /* Otherwise, set up the input size limit here. */
5208 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5209 if (expand_string_message != NULL)
5211 if (thismessage_size_limit == -1)
5212 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5213 "message_size_limit: %s", expand_string_message);
5215 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5216 "message_size_limit: %s", expand_string_message);
5220 /* Loop for several messages when reading SMTP input. If we fork any child
5221 processes, we don't want to wait for them unless synchronous delivery is
5222 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5223 same as SIG_DFL, despite the fact that documentation often lists the default as
5224 "ignore". This is a confusing area. This is what I know:
5226 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5227 processes that complete simply to go away without ever becoming defunct. You
5228 can't then wait for them - but we don't want to wait for them in the
5229 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5230 happen for all OS (e.g. *BSD is different).
5232 But that's not the end of the story. Some (many? all?) systems have the
5233 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5234 has by default, so it seems that the difference is merely one of default
5235 (compare restarting vs non-restarting signals).
5237 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5238 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5239 of the loop below. Paranoia rules.
5241 February 2003: That's *still* not the end of the story. There are now versions
5242 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5243 process then calls waitpid(), a grumble is written to the system log, because
5244 this is logically inconsistent. In other words, it doesn't like the paranoia.
5245 As a consequenc of this, the waitpid() below is now excluded if we are sure
5246 that SIG_IGN works. */
5248 if (!synchronous_delivery)
5251 struct sigaction act;
5252 act.sa_handler = SIG_IGN;
5253 sigemptyset(&(act.sa_mask));
5254 act.sa_flags = SA_NOCLDWAIT;
5255 sigaction(SIGCHLD, &act, NULL);
5257 signal(SIGCHLD, SIG_IGN);
5261 /* Save the current store pool point, for resetting at the start of
5262 each message, and save the real sender address, if any. */
5264 reset_point = store_get(0);
5265 real_sender_address = sender_address;
5267 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5268 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5273 store_reset(reset_point);
5276 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5277 input and build the recipients list, before calling receive_msg() to read the
5278 message proper. Whatever sender address is given in the SMTP transaction is
5279 often ignored for local senders - we use the actual sender, which is normally
5280 either the underlying user running this process or a -f argument provided by
5281 a trusted caller. It is saved in real_sender_address. The test for whether to
5282 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5287 if ((rc = smtp_setup_msg()) > 0)
5289 if (real_sender_address != NULL &&
5290 !receive_check_set_sender(sender_address))
5292 sender_address = raw_sender = real_sender_address;
5293 sender_address_unrewritten = NULL;
5296 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5297 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5298 the very end. The result of the ACL is ignored (as for other non-SMTP
5299 messages). It is run for its potential side effects. */
5301 if (smtp_batched_input && acl_not_smtp_start != NULL)
5303 uschar *user_msg, *log_msg;
5304 enable_dollar_recipients = TRUE;
5305 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5306 &user_msg, &log_msg);
5307 enable_dollar_recipients = FALSE;
5310 /* Now get the data for the message */
5312 more = receive_msg(extract_recipients);
5313 if (message_id[0] == 0)
5316 smtp_log_no_mail(); /* Log no mail if configured */
5317 exim_exit(EXIT_FAILURE);
5322 smtp_log_no_mail(); /* Log no mail if configured */
5323 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5327 /* In the non-SMTP case, we have all the information from the command
5328 line, but must process it in case it is in the more general RFC822
5329 format, and in any case, to detect syntax errors. Also, it appears that
5330 the use of comma-separated lists as single arguments is common, so we
5331 had better support them. */
5337 int count = argc - recipients_arg;
5338 uschar **list = argv + recipients_arg;
5340 /* These options cannot be changed dynamically for non-SMTP messages */
5342 active_local_sender_retain = local_sender_retain;
5343 active_local_from_check = local_from_check;
5345 /* Save before any rewriting */
5347 raw_sender = string_copy(sender_address);
5349 /* Loop for each argument */
5351 for (i = 0; i < count; i++)
5353 int start, end, domain;
5355 uschar *s = list[i];
5357 /* Loop for each comma-separated address */
5361 BOOL finished = FALSE;
5363 uschar *ss = parse_find_address_end(s, FALSE);
5365 if (*ss == ',') *ss = 0; else finished = TRUE;
5367 /* Check max recipients - if -t was used, these aren't recipients */
5369 if (recipients_max > 0 && ++rcount > recipients_max &&
5370 !extract_recipients)
5371 if (error_handling == ERRORS_STDERR)
5373 fprintf(stderr, "exim: too many recipients\n");
5374 exim_exit(EXIT_FAILURE);
5379 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5380 errors_sender_rc : EXIT_FAILURE;
5383 #ifdef EXPERIMENTAL_INTERNATIONAL
5385 BOOL b = allow_utf8_domains;
5386 allow_utf8_domains = TRUE;
5389 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5391 #ifdef EXPERIMENTAL_INTERNATIONAL
5392 if (string_is_utf8(recipient))
5393 message_smtputf8 = TRUE;
5395 allow_utf8_domains = b;
5398 if (domain == 0 && !allow_unqualified_recipient)
5401 errmess = US"unqualified recipient address not allowed";
5404 if (recipient == NULL)
5406 if (error_handling == ERRORS_STDERR)
5408 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5409 string_printing(list[i]), errmess);
5410 exim_exit(EXIT_FAILURE);
5416 eblock.text1 = string_printing(list[i]);
5417 eblock.text2 = errmess;
5419 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5420 errors_sender_rc : EXIT_FAILURE;
5424 receive_add_recipient(recipient, -1);
5427 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5431 /* Show the recipients when debugging */
5436 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5437 if (recipients_list != NULL)
5439 debug_printf("Recipients:\n");
5440 for (i = 0; i < recipients_count; i++)
5441 debug_printf(" %s\n", recipients_list[i].address);
5445 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5446 ignored; rejecting here would just add complication, and it can just as
5447 well be done later. Allow $recipients to be visible in the ACL. */
5449 if (acl_not_smtp_start != NULL)
5451 uschar *user_msg, *log_msg;
5452 enable_dollar_recipients = TRUE;
5453 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5454 &user_msg, &log_msg);
5455 enable_dollar_recipients = FALSE;
5458 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5459 will just read the headers for the message, and not write anything onto the
5462 message_ended = END_NOTENDED;
5463 more = receive_msg(extract_recipients);
5465 /* more is always FALSE here (not SMTP message) when reading a message
5466 for real; when reading the headers of a message for filter testing,
5467 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5469 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5470 } /* Non-SMTP message reception */
5472 /* If this is a filter testing run, there are headers in store, but
5473 no message on the spool. Run the filtering code in testing mode, setting
5474 the domain to the qualify domain and the local part to the current user,
5475 unless they have been set by options. The prefix and suffix are left unset
5476 unless specified. The the return path is set to to the sender unless it has
5477 already been set from a return-path header in the message. */
5479 if (filter_test != FTEST_NONE)
5481 deliver_domain = (ftest_domain != NULL)?
5482 ftest_domain : qualify_domain_recipient;
5483 deliver_domain_orig = deliver_domain;
5484 deliver_localpart = (ftest_localpart != NULL)?
5485 ftest_localpart : originator_login;
5486 deliver_localpart_orig = deliver_localpart;
5487 deliver_localpart_prefix = ftest_prefix;
5488 deliver_localpart_suffix = ftest_suffix;
5489 deliver_home = originator_home;
5491 if (return_path == NULL)
5493 printf("Return-path copied from sender\n");
5494 return_path = string_copy(sender_address);
5497 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5498 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5500 receive_add_recipient(
5501 string_sprintf("%s%s%s@%s",
5502 (ftest_prefix == NULL)? US"" : ftest_prefix,
5504 (ftest_suffix == NULL)? US"" : ftest_suffix,
5505 deliver_domain), -1);
5507 printf("Recipient = %s\n", recipients_list[0].address);
5508 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5509 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5511 if (chdir("/")) /* Get away from wherever the user is running this from */
5513 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5514 exim_exit(EXIT_FAILURE);
5517 /* Now we run either a system filter test, or a user filter test, or both.
5518 In the latter case, headers added by the system filter will persist and be
5519 available to the user filter. We need to copy the filter variables
5522 if ((filter_test & FTEST_SYSTEM) != 0)
5524 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5525 exim_exit(EXIT_FAILURE);
5528 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5530 if ((filter_test & FTEST_USER) != 0)
5532 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5533 exim_exit(EXIT_FAILURE);
5536 exim_exit(EXIT_SUCCESS);
5539 /* Else act on the result of message reception. We should not get here unless
5540 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5541 will be TRUE. If it is not, check on the number of messages received in this
5544 if (!session_local_queue_only &&
5545 smtp_accept_queue_per_connection > 0 &&
5546 receive_messagecount > smtp_accept_queue_per_connection)
5548 session_local_queue_only = TRUE;
5549 queue_only_reason = 2;
5552 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5553 and queue_only_load is set, check that the load average is below it. If it is
5554 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5555 default), we put the whole session into queue_only mode. It then remains this
5556 way for any subsequent messages on the same SMTP connection. This is a
5557 deliberate choice; even though the load average may fall, it doesn't seem
5558 right to deliver later messages on the same call when not delivering earlier
5559 ones. However, there are odd cases where this is not wanted, so this can be
5560 changed by setting queue_only_load_latch false. */
5562 local_queue_only = session_local_queue_only;
5563 if (!local_queue_only && queue_only_load >= 0)
5565 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5566 if (local_queue_only)
5568 queue_only_reason = 3;
5569 if (queue_only_load_latch) session_local_queue_only = TRUE;
5573 /* If running as an MUA wrapper, all queueing options and freezing options
5577 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5579 /* Log the queueing here, when it will get a message id attached, but
5580 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5583 if (local_queue_only) switch(queue_only_reason)
5586 log_write(L_delay_delivery,
5587 LOG_MAIN, "no immediate delivery: more than %d messages "
5588 "received in one connection", smtp_accept_queue_per_connection);
5592 log_write(L_delay_delivery,
5593 LOG_MAIN, "no immediate delivery: load average %.2f",
5594 (double)load_average/1000.0);
5598 /* Else do the delivery unless the ACL or local_scan() called for queue only
5599 or froze the message. Always deliver in a separate process. A fork failure is
5600 not a disaster, as the delivery will eventually happen on a subsequent queue
5601 run. The search cache must be tidied before the fork, as the parent will
5602 do it before exiting. The child will trigger a lookup failure and
5603 thereby defer the delivery if it tries to use (for example) a cached ldap
5604 connection that the parent has called unbind on. */
5606 else if (!queue_only_policy && !deliver_freeze)
5611 if ((pid = fork()) == 0)
5614 close_unwanted(); /* Close unwanted file descriptors and TLS */
5615 exim_nullstd(); /* Ensure std{in,out,err} exist */
5617 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5618 mode, deliver_drop_privilege is forced TRUE). */
5620 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5622 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5624 /* Control does not return here. */
5627 /* No need to re-exec */
5629 rc = deliver_message(message_id, FALSE, FALSE);
5631 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5632 EXIT_SUCCESS : EXIT_FAILURE);
5637 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5638 "process: %s", strerror(errno));
5641 /* In the parent, wait if synchronous delivery is required. This will
5642 always be the case in MUA wrapper mode. */
5644 else if (synchronous_delivery)
5647 while (wait(&status) != pid);
5648 if ((status & 0x00ff) != 0)
5649 log_write(0, LOG_MAIN|LOG_PANIC,
5650 "process %d crashed with signal %d while delivering %s",
5651 (int)pid, status & 0x00ff, message_id);
5652 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5656 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5657 automatically reaps children (see comments above the loop), clear away any
5658 finished subprocesses here, in case there are lots of messages coming in
5659 from the same source. */
5661 #ifndef SIG_IGN_WORKS
5662 while (waitpid(-1, NULL, WNOHANG) > 0);
5666 exim_exit(EXIT_SUCCESS); /* Never returns */
5667 return 0; /* To stop compiler warning */