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);
1038 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1039 characters; unless it's an ancient version of PCRE in which case it
1041 #ifndef PCRE_PRERELEASE
1042 #define PCRE_PRERELEASE
1045 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1046 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1048 PCRE_MAJOR, PCRE_MINOR,
1049 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1052 #undef EXPAND_AND_QUOTE
1055 for (i = 0; i < lookup_list_count; i++)
1057 if (lookup_list[i]->version_report)
1058 lookup_list[i]->version_report(f);
1061 #ifdef WHITELIST_D_MACROS
1062 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1064 fprintf(f, "WHITELIST_D_MACROS unset\n");
1066 #ifdef TRUSTED_CONFIG_LIST
1067 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1069 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1076 /*************************************************
1077 * Show auxiliary information about Exim *
1078 *************************************************/
1081 show_exim_information(enum commandline_info request, FILE *stream)
1088 fprintf(stream, "Oops, something went wrong.\n");
1092 "The -bI: flag takes a string indicating which information to provide.\n"
1093 "If the string is not recognised, you'll get this help (on stderr).\n"
1095 " exim -bI:help this information\n"
1096 " exim -bI:dscp dscp value keywords known\n"
1097 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1101 for (pp = exim_sieve_extension_list; *pp; ++pp)
1102 fprintf(stream, "%s\n", *pp);
1105 dscp_list_to_stream(stream);
1111 /*************************************************
1112 * Quote a local part *
1113 *************************************************/
1115 /* This function is used when a sender address or a From: or Sender: header
1116 line is being created from the caller's login, or from an authenticated_id. It
1117 applies appropriate quoting rules for a local part.
1119 Argument: the local part
1120 Returns: the local part, quoted if necessary
1124 local_part_quote(uschar *lpart)
1126 BOOL needs_quote = FALSE;
1131 for (t = lpart; !needs_quote && *t != 0; t++)
1133 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1134 (*t != '.' || t == lpart || t[1] == 0);
1137 if (!needs_quote) return lpart;
1140 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1144 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1147 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1150 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1151 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1152 yield = string_cat(yield, &size, &ptr, nq, 1);
1156 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1164 /*************************************************
1165 * Load readline() functions *
1166 *************************************************/
1168 /* This function is called from testing executions that read data from stdin,
1169 but only when running as the calling user. Currently, only -be does this. The
1170 function loads the readline() function library and passes back the functions.
1171 On some systems, it needs the curses library, so load that too, but try without
1172 it if loading fails. All this functionality has to be requested at build time.
1175 fn_readline_ptr pointer to where to put the readline pointer
1176 fn_addhist_ptr pointer to where to put the addhistory function
1178 Returns: the dlopen handle or NULL on failure
1182 set_readline(char * (**fn_readline_ptr)(const char *),
1183 void (**fn_addhist_ptr)(const char *))
1186 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1188 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1189 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1191 if (dlhandle != NULL)
1193 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1194 * char * readline (const char *prompt);
1195 * void add_history (const char *string);
1197 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1198 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1202 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1211 /*************************************************
1212 * Get a line from stdin for testing things *
1213 *************************************************/
1215 /* This function is called when running tests that can take a number of lines
1216 of input (for example, -be and -bt). It handles continuations and trailing
1217 spaces. And prompting and a blank line output on eof. If readline() is in use,
1218 the arguments are non-NULL and provide the relevant functions.
1221 fn_readline readline function or NULL
1222 fn_addhist addhist function or NULL
1224 Returns: pointer to dynamic memory, or NULL at end of file
1228 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1233 uschar *yield = NULL;
1235 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1239 uschar buffer[1024];
1243 char *readline_line = NULL;
1244 if (fn_readline != NULL)
1246 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1247 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1248 p = US readline_line;
1253 /* readline() not in use */
1256 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1260 /* Handle the line */
1262 ss = p + (int)Ustrlen(p);
1263 while (ss > p && isspace(ss[-1])) ss--;
1267 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1270 yield = string_cat(yield, &size, &ptr, p, ss - p);
1273 if (fn_readline != NULL) free(readline_line);
1276 if (ss == p || yield[ptr-1] != '\\')
1284 if (yield == NULL) printf("\n");
1290 /*************************************************
1291 * Output usage information for the program *
1292 *************************************************/
1294 /* This function is called when there are no recipients
1295 or a specific --help argument was added.
1298 progname information on what name we were called by
1300 Returns: DOES NOT RETURN
1304 exim_usage(uschar *progname)
1307 /* Handle specific program invocation varients */
1308 if (Ustrcmp(progname, US"-mailq") == 0)
1311 "mailq - list the contents of the mail queue\n\n"
1312 "For a list of options, see the Exim documentation.\n");
1316 /* Generic usage - we output this whatever happens */
1318 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1319 "not directly from a shell command line. Options and/or arguments control\n"
1320 "what it does when called. For a list of options, see the Exim documentation.\n");
1327 /*************************************************
1328 * Validate that the macros given are okay *
1329 *************************************************/
1331 /* Typically, Exim will drop privileges if macros are supplied. In some
1332 cases, we want to not do so.
1334 Arguments: none (macros is a global)
1335 Returns: true if trusted, false otherwise
1339 macros_trusted(void)
1341 #ifdef WHITELIST_D_MACROS
1343 uschar *whitelisted, *end, *p, **whites, **w;
1344 int white_count, i, n;
1346 BOOL prev_char_item, found;
1351 #ifndef WHITELIST_D_MACROS
1355 /* We only trust -D overrides for some invoking users:
1356 root, the exim run-time user, the optional config owner user.
1357 I don't know why config-owner would be needed, but since they can own the
1358 config files anyway, there's no security risk to letting them override -D. */
1359 if ( ! ((real_uid == root_uid)
1360 || (real_uid == exim_uid)
1361 #ifdef CONFIGURE_OWNER
1362 || (real_uid == config_uid)
1366 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1370 /* Get a list of macros which are whitelisted */
1371 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1372 prev_char_item = FALSE;
1374 for (p = whitelisted; *p != '\0'; ++p)
1376 if (*p == ':' || isspace(*p))
1381 prev_char_item = FALSE;
1384 if (!prev_char_item)
1385 prev_char_item = TRUE;
1392 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1393 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1398 if (i == white_count)
1400 while (*p != '\0' && p < end)
1406 /* The list of macros should be very short. Accept the N*M complexity. */
1407 for (m = macros; m != NULL; m = m->next)
1410 for (w = whites; *w; ++w)
1411 if (Ustrcmp(*w, m->name) == 0)
1418 if (m->replacement == NULL)
1420 len = Ustrlen(m->replacement);
1423 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1424 0, PCRE_EOPT, NULL, 0);
1427 if (n != PCRE_ERROR_NOMATCH)
1428 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1432 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1438 /*************************************************
1439 * Entry point and high-level code *
1440 *************************************************/
1442 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1443 the appropriate action. All the necessary functions are present in the one
1444 binary. I originally thought one should split it up, but it turns out that so
1445 much of the apparatus is needed in each chunk that one might as well just have
1446 it all available all the time, which then makes the coding easier as well.
1449 argc count of entries in argv
1450 argv argument strings, with argv[0] being the program name
1452 Returns: EXIT_SUCCESS if terminated successfully
1453 EXIT_FAILURE otherwise, except when a message has been sent
1454 to the sender, and -oee was given
1458 main(int argc, char **cargv)
1460 uschar **argv = USS cargv;
1461 int arg_receive_timeout = -1;
1462 int arg_smtp_receive_timeout = -1;
1463 int arg_error_handling = error_handling;
1464 int filter_sfd = -1;
1465 int filter_ufd = -1;
1468 int list_queue_option = 0;
1470 int msg_action_arg = -1;
1471 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1472 int queue_only_reason = 0;
1474 int perl_start_option = 0;
1476 int recipients_arg = argc;
1477 int sender_address_domain = 0;
1478 int test_retry_arg = -1;
1479 int test_rewrite_arg = -1;
1480 BOOL arg_queue_only = FALSE;
1481 BOOL bi_option = FALSE;
1482 BOOL checking = FALSE;
1483 BOOL count_queue = FALSE;
1484 BOOL expansion_test = FALSE;
1485 BOOL extract_recipients = FALSE;
1486 BOOL flag_G = FALSE;
1487 BOOL flag_n = FALSE;
1488 BOOL forced_delivery = FALSE;
1489 BOOL f_end_dot = FALSE;
1490 BOOL deliver_give_up = FALSE;
1491 BOOL list_queue = FALSE;
1492 BOOL list_options = FALSE;
1493 BOOL local_queue_only;
1495 BOOL one_msg_action = FALSE;
1496 BOOL queue_only_set = FALSE;
1497 BOOL receiving_message = TRUE;
1498 BOOL sender_ident_set = FALSE;
1499 BOOL session_local_queue_only;
1501 BOOL removed_privilege = FALSE;
1502 BOOL usage_wanted = FALSE;
1503 BOOL verify_address_mode = FALSE;
1504 BOOL verify_as_sender = FALSE;
1505 BOOL version_printed = FALSE;
1506 uschar *alias_arg = NULL;
1507 uschar *called_as = US"";
1508 uschar *cmdline_syslog_name = NULL;
1509 uschar *start_queue_run_id = NULL;
1510 uschar *stop_queue_run_id = NULL;
1511 uschar *expansion_test_message = NULL;
1512 uschar *ftest_domain = NULL;
1513 uschar *ftest_localpart = NULL;
1514 uschar *ftest_prefix = NULL;
1515 uschar *ftest_suffix = NULL;
1516 uschar *log_oneline = NULL;
1517 uschar *malware_test_file = NULL;
1518 uschar *real_sender_address;
1519 uschar *originator_home = US"/";
1524 struct stat statbuf;
1525 pid_t passed_qr_pid = (pid_t)0;
1526 int passed_qr_pipe = -1;
1527 gid_t group_list[NGROUPS_MAX];
1529 /* For the -bI: flag */
1530 enum commandline_info info_flag = CMDINFO_NONE;
1531 BOOL info_stdout = FALSE;
1533 /* Possible options for -R and -S */
1535 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1537 /* Need to define this in case we need to change the environment in order
1538 to get rid of a bogus time zone. We have to make it char rather than uschar
1539 because some OS define it in /usr/include/unistd.h. */
1541 extern char **environ;
1543 /* If the Exim user and/or group and/or the configuration file owner/group were
1544 defined by ref:name at build time, we must now find the actual uid/gid values.
1545 This is a feature to make the lives of binary distributors easier. */
1547 #ifdef EXIM_USERNAME
1548 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1552 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1556 /* If ref:name uses a number as the name, route_finduser() returns
1557 TRUE with exim_uid set and pw coerced to NULL. */
1559 exim_gid = pw->pw_gid;
1560 #ifndef EXIM_GROUPNAME
1564 "exim: ref:name should specify a usercode, not a group.\n"
1565 "exim: can't let you get away with it unless you also specify a group.\n");
1572 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1578 #ifdef EXIM_GROUPNAME
1579 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1581 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1587 #ifdef CONFIGURE_OWNERNAME
1588 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1590 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1591 CONFIGURE_OWNERNAME);
1596 /* We default the system_filter_user to be the Exim run-time user, as a
1597 sane non-root value. */
1598 system_filter_uid = exim_uid;
1600 #ifdef CONFIGURE_GROUPNAME
1601 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1603 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1604 CONFIGURE_GROUPNAME);
1609 /* In the Cygwin environment, some initialization needs doing. It is fudged
1610 in by means of this macro. */
1616 /* Check a field which is patched when we are running Exim within its
1617 testing harness; do a fast initial check, and then the whole thing. */
1619 running_in_test_harness =
1620 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1622 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1623 at the start of a program; however, it seems that some environments do not
1624 follow this. A "strange" locale can affect the formatting of timestamps, so we
1627 setlocale(LC_ALL, "C");
1629 /* Set up the default handler for timing using alarm(). */
1631 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1633 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1634 because store_malloc writes a log entry on failure. */
1636 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1637 if (log_buffer == NULL)
1639 fprintf(stderr, "exim: failed to get store for log buffer\n");
1643 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1644 NULL when the daemon is run and the file is closed. We have to use this
1645 indirection, because some systems don't allow writing to the variable "stderr".
1648 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1650 /* Arrange for the PCRE regex library to use our store functions. Note that
1651 the normal calls are actually macros that add additional arguments for
1652 debugging purposes so we have to assign specially constructed functions here.
1653 The default is to use store in the stacking pool, but this is overridden in the
1654 regex_must_compile() function. */
1656 pcre_malloc = function_store_get;
1657 pcre_free = function_dummy_free;
1659 /* Ensure there is a big buffer for temporary use in several places. It is put
1660 in malloc store so that it can be freed for enlargement if necessary. */
1662 big_buffer = store_malloc(big_buffer_size);
1664 /* Set up the handler for the data request signal, and set the initial
1665 descriptive text. */
1667 set_process_info("initializing");
1668 os_restarting_signal(SIGUSR1, usr1_handler);
1670 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1671 in the daemon code. For the rest of Exim's uses, we ignore it. */
1673 signal(SIGHUP, SIG_IGN);
1675 /* We don't want to die on pipe errors as the code is written to handle
1676 the write error instead. */
1678 signal(SIGPIPE, SIG_IGN);
1680 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1681 set to SIG_IGN. This causes subprocesses that complete before the parent
1682 process waits for them not to hang around, so when Exim calls wait(), nothing
1683 is there. The wait() code has been made robust against this, but let's ensure
1684 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1685 ending status. We use sigaction rather than plain signal() on those OS where
1686 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1687 problem on AIX with this.) */
1691 struct sigaction act;
1692 act.sa_handler = SIG_DFL;
1693 sigemptyset(&(act.sa_mask));
1695 sigaction(SIGCHLD, &act, NULL);
1698 signal(SIGCHLD, SIG_DFL);
1701 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1706 /* Set up the version number. Set up the leading 'E' for the external form of
1707 message ids, set the pointer to the internal form, and initialize it to
1708 indicate no message being processed. */
1711 message_id_option[0] = '-';
1712 message_id_external = message_id_option + 1;
1713 message_id_external[0] = 'E';
1714 message_id = message_id_external + 1;
1717 /* Set the umask to zero so that any files Exim creates using open() are
1718 created with the modes that it specifies. NOTE: Files created with fopen() have
1719 a problem, which was not recognized till rather late (February 2006). With this
1720 umask, such files will be world writeable. (They are all content scanning files
1721 in the spool directory, which isn't world-accessible, so this is not a
1722 disaster, but it's untidy.) I don't want to change this overall setting,
1723 however, because it will interact badly with the open() calls. Instead, there's
1724 now a function called modefopen() that fiddles with the umask while calling
1729 /* Precompile the regular expression for matching a message id. Keep this in
1730 step with the code that generates ids in the accept.c module. We need to do
1731 this here, because the -M options check their arguments for syntactic validity
1732 using mac_ismsgid, which uses this. */
1735 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1737 /* Precompile the regular expression that is used for matching an SMTP error
1738 code, possibly extended, at the start of an error message. Note that the
1739 terminating whitespace character is included. */
1742 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1745 #ifdef WHITELIST_D_MACROS
1746 /* Precompile the regular expression used to filter the content of macros
1747 given to -D for permissibility. */
1749 regex_whitelisted_macro =
1750 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1754 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1755 this seems to be a generally accepted convention, since one finds symbolic
1756 links called "mailq" in standard OS configurations. */
1758 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1759 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1762 receiving_message = FALSE;
1763 called_as = US"-mailq";
1766 /* If the program is called as "rmail" treat it as equivalent to
1767 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1768 i.e. preventing a single dot on a line from terminating the message, and
1769 returning with zero return code, even in cases of error (provided an error
1770 message has been sent). */
1772 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1773 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1776 called_as = US"-rmail";
1777 errors_sender_rc = EXIT_SUCCESS;
1780 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1781 this is a smail convention. */
1783 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1784 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1786 smtp_input = smtp_batched_input = TRUE;
1787 called_as = US"-rsmtp";
1790 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1791 this is a smail convention. */
1793 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1794 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1797 receiving_message = FALSE;
1798 called_as = US"-runq";
1801 /* If the program is called as "newaliases" treat it as equivalent to
1802 "exim -bi"; this is a sendmail convention. */
1804 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1805 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1808 receiving_message = FALSE;
1809 called_as = US"-newaliases";
1812 /* Save the original effective uid for a couple of uses later. It should
1813 normally be root, but in some esoteric environments it may not be. */
1815 original_euid = geteuid();
1817 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1818 to be the same as the real ones. This makes a difference only if Exim is setuid
1819 (or setgid) to something other than root, which could be the case in some
1820 special configurations. */
1822 real_uid = getuid();
1823 real_gid = getgid();
1825 if (real_uid == root_uid)
1827 rv = setgid(real_gid);
1830 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1831 (long int)real_gid, strerror(errno));
1834 rv = setuid(real_uid);
1837 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1838 (long int)real_uid, strerror(errno));
1843 /* If neither the original real uid nor the original euid was root, Exim is
1844 running in an unprivileged state. */
1846 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1848 /* Scan the program's arguments. Some can be dealt with right away; others are
1849 simply recorded for checking and handling afterwards. Do a high-level switch
1850 on the second character (the one after '-'), to save some effort. */
1852 for (i = 1; i < argc; i++)
1854 BOOL badarg = FALSE;
1855 uschar *arg = argv[i];
1859 /* An argument not starting with '-' is the start of a recipients list;
1860 break out of the options-scanning loop. */
1868 /* An option consistion of -- terminates the options */
1870 if (Ustrcmp(arg, "--") == 0)
1872 recipients_arg = i + 1;
1876 /* Handle flagged options */
1878 switchchar = arg[1];
1881 /* Make all -ex options synonymous with -oex arguments, since that
1882 is assumed by various callers. Also make -qR options synonymous with -R
1883 options, as that seems to be required as well. Allow for -qqR too, and
1884 the same for -S options. */
1886 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1887 Ustrncmp(arg+1, "qR", 2) == 0 ||
1888 Ustrncmp(arg+1, "qS", 2) == 0)
1890 switchchar = arg[2];
1893 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1895 switchchar = arg[3];
1897 queue_2stage = TRUE;
1900 /* Make -r synonymous with -f, since it is a documented alias */
1902 else if (arg[1] == 'r') switchchar = 'f';
1904 /* Make -ov synonymous with -v */
1906 else if (Ustrcmp(arg, "-ov") == 0)
1912 /* deal with --option_aliases */
1913 else if (switchchar == '-')
1915 if (Ustrcmp(argrest, "help") == 0)
1917 usage_wanted = TRUE;
1920 else if (Ustrcmp(argrest, "version") == 0)
1927 /* High-level switch on active initial letter */
1932 /* sendmail uses -Ac and -Am to control which .cf file is used;
1935 if (*argrest == '\0') { badarg = TRUE; break; }
1938 BOOL ignore = FALSE;
1943 if (*(argrest + 1) == '\0')
1947 if (!ignore) { badarg = TRUE; break; }
1951 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1952 so has no need of it. */
1955 if (*argrest == 0) i++; /* Skip over the type */
1960 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1962 /* -bd: Run in daemon mode, awaiting SMTP connections.
1963 -bdf: Ditto, but in the foreground.
1966 if (*argrest == 'd')
1968 daemon_listen = TRUE;
1969 if (*(++argrest) == 'f') background_daemon = FALSE;
1970 else if (*argrest != 0) { badarg = TRUE; break; }
1973 /* -be: Run in expansion test mode
1974 -bem: Ditto, but read a message from a file first
1977 else if (*argrest == 'e')
1979 expansion_test = checking = TRUE;
1980 if (argrest[1] == 'm')
1982 if (++i >= argc) { badarg = TRUE; break; }
1983 expansion_test_message = argv[i];
1986 if (argrest[1] != 0) { badarg = TRUE; break; }
1989 /* -bF: Run system filter test */
1991 else if (*argrest == 'F')
1993 filter_test |= FTEST_SYSTEM;
1994 if (*(++argrest) != 0) { badarg = TRUE; break; }
1995 if (++i < argc) filter_test_sfile = argv[i]; else
1997 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2002 /* -bf: Run user filter test
2003 -bfd: Set domain for filter testing
2004 -bfl: Set local part for filter testing
2005 -bfp: Set prefix for filter testing
2006 -bfs: Set suffix for filter testing
2009 else if (*argrest == 'f')
2011 if (*(++argrest) == 0)
2013 filter_test |= FTEST_USER;
2014 if (++i < argc) filter_test_ufile = argv[i]; else
2016 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2024 fprintf(stderr, "exim: string expected after %s\n", arg);
2027 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2028 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2029 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2030 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2031 else { badarg = TRUE; break; }
2035 /* -bh: Host checking - an IP address must follow. */
2037 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2039 if (++i >= argc) { badarg = TRUE; break; }
2040 sender_host_address = argv[i];
2041 host_checking = checking = log_testing_mode = TRUE;
2042 host_checking_callout = argrest[1] == 'c';
2045 /* -bi: This option is used by sendmail to initialize *the* alias file,
2046 though it has the -oA option to specify a different file. Exim has no
2047 concept of *the* alias file, but since Sun's YP make script calls
2048 sendmail this way, some support must be provided. */
2050 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2052 /* -bI: provide information, of the type to follow after a colon.
2053 This is an Exim flag. */
2055 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2057 uschar *p = &argrest[2];
2058 info_flag = CMDINFO_HELP;
2061 if (strcmpic(p, CUS"sieve") == 0)
2063 info_flag = CMDINFO_SIEVE;
2066 else if (strcmpic(p, CUS"dscp") == 0)
2068 info_flag = CMDINFO_DSCP;
2071 else if (strcmpic(p, CUS"help") == 0)
2078 /* -bm: Accept and deliver message - the default option. Reinstate
2079 receiving_message, which got turned off for all -b options. */
2081 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2083 /* -bmalware: test the filename given for malware */
2085 else if (Ustrcmp(argrest, "malware") == 0)
2087 if (++i >= argc) { badarg = TRUE; break; }
2088 malware_test_file = argv[i];
2091 /* -bnq: For locally originating messages, do not qualify unqualified
2092 addresses. In the envelope, this causes errors; in header lines they
2095 else if (Ustrcmp(argrest, "nq") == 0)
2097 allow_unqualified_sender = FALSE;
2098 allow_unqualified_recipient = FALSE;
2101 /* -bpxx: List the contents of the mail queue, in various forms. If
2102 the option is -bpc, just a queue count is needed. Otherwise, if the
2103 first letter after p is r, then order is random. */
2105 else if (*argrest == 'p')
2107 if (*(++argrest) == 'c')
2110 if (*(++argrest) != 0) badarg = TRUE;
2114 if (*argrest == 'r')
2116 list_queue_option = 8;
2119 else list_queue_option = 0;
2123 /* -bp: List the contents of the mail queue, top-level only */
2125 if (*argrest == 0) {}
2127 /* -bpu: List the contents of the mail queue, top-level undelivered */
2129 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2131 /* -bpa: List the contents of the mail queue, including all delivered */
2133 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2135 /* Unknown after -bp[r] */
2145 /* -bP: List the configuration variables given as the address list.
2146 Force -v, so configuration errors get displayed. */
2148 else if (Ustrcmp(argrest, "P") == 0)
2150 list_options = TRUE;
2151 debug_selector |= D_v;
2152 debug_file = stderr;
2155 /* -brt: Test retry configuration lookup */
2157 else if (Ustrcmp(argrest, "rt") == 0)
2159 test_retry_arg = i + 1;
2163 /* -brw: Test rewrite configuration */
2165 else if (Ustrcmp(argrest, "rw") == 0)
2167 test_rewrite_arg = i + 1;
2171 /* -bS: Read SMTP commands on standard input, but produce no replies -
2172 all errors are reported by sending messages. */
2174 else if (Ustrcmp(argrest, "S") == 0)
2175 smtp_input = smtp_batched_input = receiving_message = TRUE;
2177 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2178 on standard output. */
2180 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2182 /* -bt: address testing mode */
2184 else if (Ustrcmp(argrest, "t") == 0)
2185 address_test_mode = checking = log_testing_mode = TRUE;
2187 /* -bv: verify addresses */
2189 else if (Ustrcmp(argrest, "v") == 0)
2190 verify_address_mode = checking = log_testing_mode = TRUE;
2192 /* -bvs: verify sender addresses */
2194 else if (Ustrcmp(argrest, "vs") == 0)
2196 verify_address_mode = checking = log_testing_mode = TRUE;
2197 verify_as_sender = TRUE;
2200 /* -bV: Print version string and support details */
2202 else if (Ustrcmp(argrest, "V") == 0)
2204 printf("Exim version %s #%s built %s\n", version_string,
2205 version_cnumber, version_date);
2206 printf("%s\n", CS version_copyright);
2207 version_printed = TRUE;
2208 show_whats_supported(stdout);
2211 /* -bw: inetd wait mode, accept a listening socket as stdin */
2213 else if (*argrest == 'w')
2215 inetd_wait_mode = TRUE;
2216 background_daemon = FALSE;
2217 daemon_listen = TRUE;
2218 if (*(++argrest) != '\0')
2220 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2221 if (inetd_wait_timeout <= 0)
2223 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2233 /* -C: change configuration file list; ignore if it isn't really
2234 a change! Enforce a prefix check if required. */
2239 if(++i < argc) argrest = argv[i]; else
2240 { badarg = TRUE; break; }
2242 if (Ustrcmp(config_main_filelist, argrest) != 0)
2244 #ifdef ALT_CONFIG_PREFIX
2246 int len = Ustrlen(ALT_CONFIG_PREFIX);
2247 uschar *list = argrest;
2249 while((filename = string_nextinlist(&list, &sep, big_buffer,
2250 big_buffer_size)) != NULL)
2252 if ((Ustrlen(filename) < len ||
2253 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2254 Ustrstr(filename, "/../") != NULL) &&
2255 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2257 fprintf(stderr, "-C Permission denied\n");
2262 if (real_uid != root_uid)
2264 #ifdef TRUSTED_CONFIG_LIST
2266 if (real_uid != exim_uid
2267 #ifdef CONFIGURE_OWNER
2268 && real_uid != config_uid
2271 trusted_config = FALSE;
2274 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2277 struct stat statbuf;
2279 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2280 (statbuf.st_uid != root_uid /* owner not root */
2281 #ifdef CONFIGURE_OWNER
2282 && statbuf.st_uid != config_uid /* owner not the special one */
2285 (statbuf.st_gid != root_gid /* group not root */
2286 #ifdef CONFIGURE_GROUP
2287 && statbuf.st_gid != config_gid /* group not the special one */
2289 && (statbuf.st_mode & 020) != 0 /* group writeable */
2291 (statbuf.st_mode & 2) != 0) /* world writeable */
2293 trusted_config = FALSE;
2298 /* Well, the trust list at least is up to scratch... */
2299 void *reset_point = store_get(0);
2300 uschar *trusted_configs[32];
2304 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2306 uschar *start = big_buffer, *nl;
2307 while (*start && isspace(*start))
2311 nl = Ustrchr(start, '\n');
2314 trusted_configs[nr_configs++] = string_copy(start);
2315 if (nr_configs == 32)
2323 const uschar *list = argrest;
2325 while (trusted_config && (filename = string_nextinlist(&list,
2326 &sep, big_buffer, big_buffer_size)) != NULL)
2328 for (i=0; i < nr_configs; i++)
2330 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2333 if (i == nr_configs)
2335 trusted_config = FALSE;
2339 store_reset(reset_point);
2343 /* No valid prefixes found in trust_list file. */
2344 trusted_config = FALSE;
2350 /* Could not open trust_list file. */
2351 trusted_config = FALSE;
2355 /* Not root; don't trust config */
2356 trusted_config = FALSE;
2360 config_main_filelist = argrest;
2361 config_changed = TRUE;
2366 /* -D: set up a macro definition */
2369 #ifdef DISABLE_D_OPTION
2370 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2375 macro_item *mlast = NULL;
2378 uschar *s = argrest;
2380 while (isspace(*s)) s++;
2382 if (*s < 'A' || *s > 'Z')
2384 fprintf(stderr, "exim: macro name set by -D must start with "
2385 "an upper case letter\n");
2389 while (isalnum(*s) || *s == '_')
2391 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2395 if (ptr == 0) { badarg = TRUE; break; }
2396 while (isspace(*s)) s++;
2399 if (*s++ != '=') { badarg = TRUE; break; }
2400 while (isspace(*s)) s++;
2403 for (m = macros; m != NULL; m = m->next)
2405 if (Ustrcmp(m->name, name) == 0)
2407 fprintf(stderr, "exim: duplicated -D in command line\n");
2413 m = store_get(sizeof(macro_item) + Ustrlen(name));
2415 m->command_line = TRUE;
2416 if (mlast == NULL) macros = m; else mlast->next = m;
2417 Ustrcpy(m->name, name);
2418 m->replacement = string_copy(s);
2420 if (clmacro_count >= MAX_CLMACROS)
2422 fprintf(stderr, "exim: too many -D options on command line\n");
2425 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2431 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2432 The latter is now a no-op, retained for compatibility only. If -dd is used,
2433 debugging subprocesses of the daemon is disabled. */
2436 if (Ustrcmp(argrest, "ropcr") == 0)
2438 /* drop_cr = TRUE; */
2441 /* Use an intermediate variable so that we don't set debugging while
2442 decoding the debugging bits. */
2446 unsigned int selector = D_default;
2449 if (*argrest == 'd')
2451 debug_daemon = TRUE;
2455 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2456 debug_options_count, US"debug", 0);
2457 debug_selector = selector;
2462 /* -E: This is a local error message. This option is not intended for
2463 external use at all, but is not restricted to trusted callers because it
2464 does no harm (just suppresses certain error messages) and if Exim is run
2465 not setuid root it won't always be trusted when it generates error
2466 messages using this option. If there is a message id following -E, point
2467 message_reference at it, for logging. */
2470 local_error_message = TRUE;
2471 if (mac_ismsgid(argrest)) message_reference = argrest;
2475 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2476 option, so it looks as if historically the -oex options are also callable
2477 without the leading -o. So we have to accept them. Before the switch,
2478 anything starting -oe has been converted to -e. Exim does not support all
2479 of the sendmail error options. */
2482 if (Ustrcmp(argrest, "e") == 0)
2484 arg_error_handling = ERRORS_SENDER;
2485 errors_sender_rc = EXIT_SUCCESS;
2487 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2488 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2489 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2490 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2495 /* -F: Set sender's full name, used instead of the gecos entry from
2496 the password file. Since users can usually alter their gecos entries,
2497 there's no security involved in using this instead. The data can follow
2498 the -F or be in the next argument. */
2503 if(++i < argc) argrest = argv[i]; else
2504 { badarg = TRUE; break; }
2506 originator_name = argrest;
2507 sender_name_forced = TRUE;
2511 /* -f: Set sender's address - this value is only actually used if Exim is
2512 run by a trusted user, or if untrusted_set_sender is set and matches the
2513 address, except that the null address can always be set by any user. The
2514 test for this happens later, when the value given here is ignored when not
2515 permitted. For an untrusted user, the actual sender is still put in Sender:
2516 if it doesn't match the From: header (unless no_local_from_check is set).
2517 The data can follow the -f or be in the next argument. The -r switch is an
2518 obsolete form of -f but since there appear to be programs out there that
2519 use anything that sendmail has ever supported, better accept it - the
2520 synonymizing is done before the switch above.
2522 At this stage, we must allow domain literal addresses, because we don't
2523 know what the setting of allow_domain_literals is yet. Ditto for trailing
2524 dots and strip_trailing_dot. */
2528 int dummy_start, dummy_end;
2532 if (i+1 < argc) argrest = argv[++i]; else
2533 { badarg = TRUE; break; }
2536 sender_address = string_sprintf(""); /* Ensure writeable memory */
2539 uschar *temp = argrest + Ustrlen(argrest) - 1;
2540 while (temp >= argrest && isspace(*temp)) temp--;
2541 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2542 allow_domain_literals = TRUE;
2543 strip_trailing_dot = TRUE;
2544 #ifdef EXPERIMENTAL_INTERNATIONAL
2545 allow_utf8_domains = TRUE;
2547 sender_address = parse_extract_address(argrest, &errmess,
2548 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2549 #ifdef EXPERIMENTAL_INTERNATIONAL
2550 message_smtputf8 = string_is_utf8(sender_address);
2551 allow_utf8_domains = FALSE;
2553 allow_domain_literals = FALSE;
2554 strip_trailing_dot = FALSE;
2555 if (sender_address == NULL)
2557 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2558 return EXIT_FAILURE;
2561 sender_address_forced = TRUE;
2565 /* -G: sendmail invocation to specify that it's a gateway submission and
2566 sendmail may complain about problems instead of fixing them.
2567 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2568 not at this time complain about problems. */
2574 /* -h: Set the hop count for an incoming message. Exim does not currently
2575 support this; it always computes it by counting the Received: headers.
2576 To put it in will require a change to the spool header file format. */
2581 if(++i < argc) argrest = argv[i]; else
2582 { badarg = TRUE; break; }
2584 if (!isdigit(*argrest)) badarg = TRUE;
2588 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2589 not to be documented for sendmail but mailx (at least) uses it) */
2592 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2596 /* -L: set the identifier used for syslog; equivalent to setting
2597 syslog_processname in the config file, but needs to be an admin option. */
2600 if (*argrest == '\0')
2602 if(++i < argc) argrest = argv[i]; else
2603 { badarg = TRUE; break; }
2605 sz = Ustrlen(argrest);
2608 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2609 return EXIT_FAILURE;
2613 fprintf(stderr, "exim: the -L syslog name is too short\n");
2614 return EXIT_FAILURE;
2616 cmdline_syslog_name = argrest;
2620 receiving_message = FALSE;
2622 /* -MC: continue delivery of another message via an existing open
2623 file descriptor. This option is used for an internal call by the
2624 smtp transport when there is a pending message waiting to go to an
2625 address to which it has got a connection. Five subsequent arguments are
2626 required: transport name, host name, IP address, sequence number, and
2627 message_id. Transports may decline to create new processes if the sequence
2628 number gets too big. The channel is stdin. This (-MC) must be the last
2629 argument. There's a subsequent check that the real-uid is privileged.
2631 If we are running in the test harness. delay for a bit, to let the process
2632 that set this one up complete. This makes for repeatability of the logging,
2635 if (Ustrcmp(argrest, "C") == 0)
2637 union sockaddr_46 interface_sock;
2638 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2642 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2643 return EXIT_FAILURE;
2646 if (msg_action_arg >= 0)
2648 fprintf(stderr, "exim: incompatible arguments\n");
2649 return EXIT_FAILURE;
2652 continue_transport = argv[++i];
2653 continue_hostname = argv[++i];
2654 continue_host_address = argv[++i];
2655 continue_sequence = Uatoi(argv[++i]);
2656 msg_action = MSG_DELIVER;
2657 msg_action_arg = ++i;
2658 forced_delivery = TRUE;
2659 queue_run_pid = passed_qr_pid;
2660 queue_run_pipe = passed_qr_pipe;
2662 if (!mac_ismsgid(argv[i]))
2664 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2666 return EXIT_FAILURE;
2669 /* Set up $sending_ip_address and $sending_port */
2671 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2673 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2677 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2679 return EXIT_FAILURE;
2682 if (running_in_test_harness) millisleep(500);
2686 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2687 precedes -MC (see above). The flag indicates that the host to which
2688 Exim is connected has accepted an AUTH sequence. */
2690 else if (Ustrcmp(argrest, "CA") == 0)
2692 smtp_authenticated = TRUE;
2696 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2697 that exim is connected to supports the esmtp extension DSN */
2698 else if (Ustrcmp(argrest, "CD") == 0)
2700 smtp_use_dsn = TRUE;
2704 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2705 it preceded -MC (see above) */
2707 else if (Ustrcmp(argrest, "CP") == 0)
2709 smtp_use_pipelining = TRUE;
2713 /* -MCQ: pass on the pid of the queue-running process that started
2714 this chain of deliveries and the fd of its synchronizing pipe; this
2715 is useful only when it precedes -MC (see above) */
2717 else if (Ustrcmp(argrest, "CQ") == 0)
2719 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2721 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2726 /* -MCS: set the smtp_use_size flag; this is useful only when it
2727 precedes -MC (see above) */
2729 else if (Ustrcmp(argrest, "CS") == 0)
2731 smtp_use_size = TRUE;
2735 /* -MCT: set the tls_offered flag; this is useful only when it
2736 precedes -MC (see above). The flag indicates that the host to which
2737 Exim is connected has offered TLS support. */
2740 else if (Ustrcmp(argrest, "CT") == 0)
2747 /* -M[x]: various operations on the following list of message ids:
2748 -M deliver the messages, ignoring next retry times and thawing
2749 -Mc deliver the messages, checking next retry times, no thawing
2750 -Mf freeze the messages
2751 -Mg give up on the messages
2752 -Mt thaw the messages
2753 -Mrm remove the messages
2754 In the above cases, this must be the last option. There are also the
2755 following options which are followed by a single message id, and which
2756 act on that message. Some of them use the "recipient" addresses as well.
2757 -Mar add recipient(s)
2758 -Mmad mark all recipients delivered
2759 -Mmd mark recipients(s) delivered
2761 -Mset load a message for use with -be
2763 -Mvc show copy (of whole message, in RFC 2822 format)
2768 else if (*argrest == 0)
2770 msg_action = MSG_DELIVER;
2771 forced_delivery = deliver_force_thaw = TRUE;
2773 else if (Ustrcmp(argrest, "ar") == 0)
2775 msg_action = MSG_ADD_RECIPIENT;
2776 one_msg_action = TRUE;
2778 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2779 else if (Ustrcmp(argrest, "es") == 0)
2781 msg_action = MSG_EDIT_SENDER;
2782 one_msg_action = TRUE;
2784 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2785 else if (Ustrcmp(argrest, "g") == 0)
2787 msg_action = MSG_DELIVER;
2788 deliver_give_up = TRUE;
2790 else if (Ustrcmp(argrest, "mad") == 0)
2792 msg_action = MSG_MARK_ALL_DELIVERED;
2794 else if (Ustrcmp(argrest, "md") == 0)
2796 msg_action = MSG_MARK_DELIVERED;
2797 one_msg_action = TRUE;
2799 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2800 else if (Ustrcmp(argrest, "set") == 0)
2802 msg_action = MSG_LOAD;
2803 one_msg_action = TRUE;
2805 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2806 else if (Ustrcmp(argrest, "vb") == 0)
2808 msg_action = MSG_SHOW_BODY;
2809 one_msg_action = TRUE;
2811 else if (Ustrcmp(argrest, "vc") == 0)
2813 msg_action = MSG_SHOW_COPY;
2814 one_msg_action = TRUE;
2816 else if (Ustrcmp(argrest, "vh") == 0)
2818 msg_action = MSG_SHOW_HEADER;
2819 one_msg_action = TRUE;
2821 else if (Ustrcmp(argrest, "vl") == 0)
2823 msg_action = MSG_SHOW_LOG;
2824 one_msg_action = TRUE;
2826 else { badarg = TRUE; break; }
2828 /* All the -Mxx options require at least one message id. */
2830 msg_action_arg = i + 1;
2831 if (msg_action_arg >= argc)
2833 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2834 return EXIT_FAILURE;
2837 /* Some require only message ids to follow */
2839 if (!one_msg_action)
2842 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2844 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2846 return EXIT_FAILURE;
2848 goto END_ARG; /* Remaining args are ids */
2851 /* Others require only one message id, possibly followed by addresses,
2852 which will be handled as normal arguments. */
2856 if (!mac_ismsgid(argv[msg_action_arg]))
2858 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2859 argv[msg_action_arg], arg);
2860 return EXIT_FAILURE;
2867 /* Some programs seem to call the -om option without the leading o;
2868 for sendmail it askes for "me too". Exim always does this. */
2871 if (*argrest != 0) badarg = TRUE;
2875 /* -N: don't do delivery - a debugging option that stops transports doing
2876 their thing. It implies debugging at the D_v level. */
2881 dont_deliver = TRUE;
2882 debug_selector |= D_v;
2883 debug_file = stderr;
2889 /* -n: This means "don't alias" in sendmail, apparently.
2890 For normal invocations, it has no effect.
2891 It may affect some other options. */
2897 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2898 option to the specified value. This form uses long names. We need to handle
2899 -O option=value and -Ooption=value. */
2906 fprintf(stderr, "exim: string expected after -O\n");
2914 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2917 if (*argrest == 'A')
2919 alias_arg = argrest + 1;
2920 if (alias_arg[0] == 0)
2922 if (i+1 < argc) alias_arg = argv[++i]; else
2924 fprintf(stderr, "exim: string expected after -oA\n");
2930 /* -oB: Set a connection message max value for remote deliveries */
2932 else if (*argrest == 'B')
2934 uschar *p = argrest + 1;
2937 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2939 connection_max_messages = 1;
2948 fprintf(stderr, "exim: number expected after -oB\n");
2951 connection_max_messages = Uatoi(p);
2955 /* -odb: background delivery */
2957 else if (Ustrcmp(argrest, "db") == 0)
2959 synchronous_delivery = FALSE;
2960 arg_queue_only = FALSE;
2961 queue_only_set = TRUE;
2964 /* -odf: foreground delivery (smail-compatible option); same effect as
2965 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2968 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2970 synchronous_delivery = TRUE;
2971 arg_queue_only = FALSE;
2972 queue_only_set = TRUE;
2975 /* -odq: queue only */
2977 else if (Ustrcmp(argrest, "dq") == 0)
2979 synchronous_delivery = FALSE;
2980 arg_queue_only = TRUE;
2981 queue_only_set = TRUE;
2984 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2985 but no remote delivery */
2987 else if (Ustrcmp(argrest, "dqs") == 0)
2990 arg_queue_only = FALSE;
2991 queue_only_set = TRUE;
2994 /* -oex: Sendmail error flags. As these are also accepted without the
2995 leading -o prefix, for compatibility with vacation and other callers,
2996 they are handled with -e above. */
2998 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2999 -oitrue: Another sendmail syntax for the same */
3001 else if (Ustrcmp(argrest, "i") == 0 ||
3002 Ustrcmp(argrest, "itrue") == 0)
3005 /* -oM*: Set various characteristics for an incoming message; actually
3006 acted on for trusted callers only. */
3008 else if (*argrest == 'M')
3012 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3016 /* -oMa: Set sender host address */
3018 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3020 /* -oMaa: Set authenticator name */
3022 else if (Ustrcmp(argrest, "Maa") == 0)
3023 sender_host_authenticated = argv[++i];
3025 /* -oMas: setting authenticated sender */
3027 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3029 /* -oMai: setting authenticated id */
3031 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3033 /* -oMi: Set incoming interface address */
3035 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3037 /* -oMm: Message reference */
3039 else if (Ustrcmp(argrest, "Mm") == 0)
3041 if (!mac_ismsgid(argv[i+1]))
3043 fprintf(stderr,"-oMm must be a valid message ID\n");
3046 if (!trusted_config)
3048 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3051 message_reference = argv[++i];
3054 /* -oMr: Received protocol */
3056 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3058 /* -oMs: Set sender host name */
3060 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3062 /* -oMt: Set sender ident */
3064 else if (Ustrcmp(argrest, "Mt") == 0)
3066 sender_ident_set = TRUE;
3067 sender_ident = argv[++i];
3070 /* Else a bad argument */
3079 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3080 seem to call this as -m (undocumented), so that is also accepted (see
3083 else if (Ustrcmp(argrest, "m") == 0) {}
3085 /* -oo: An ancient flag for old-style addresses which still seems to
3086 crop up in some calls (see in SCO). */
3088 else if (Ustrcmp(argrest, "o") == 0) {}
3090 /* -oP <name>: set pid file path for daemon */
3092 else if (Ustrcmp(argrest, "P") == 0)
3093 override_pid_file_path = argv[++i];
3095 /* -or <n>: set timeout for non-SMTP acceptance
3096 -os <n>: set timeout for SMTP acceptance */
3098 else if (*argrest == 'r' || *argrest == 's')
3100 int *tp = (*argrest == 'r')?
3101 &arg_receive_timeout : &arg_smtp_receive_timeout;
3102 if (argrest[1] == 0)
3104 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3106 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3109 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3114 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3116 else if (Ustrcmp(argrest, "X") == 0)
3117 override_local_interfaces = argv[++i];
3119 /* Unknown -o argument */
3125 /* -ps: force Perl startup; -pd force delayed Perl startup */
3129 if (*argrest == 's' && argrest[1] == 0)
3131 perl_start_option = 1;
3134 if (*argrest == 'd' && argrest[1] == 0)
3136 perl_start_option = -1;
3141 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3142 which sets the host protocol and host name */
3146 if (i+1 < argc) argrest = argv[++i]; else
3147 { badarg = TRUE; break; }
3152 uschar *hn = Ustrchr(argrest, ':');
3155 received_protocol = argrest;
3159 received_protocol = string_copyn(argrest, hn - argrest);
3160 sender_host_name = hn + 1;
3167 receiving_message = FALSE;
3168 if (queue_interval >= 0)
3170 fprintf(stderr, "exim: -q specified more than once\n");
3174 /* -qq...: Do queue runs in a 2-stage manner */
3176 if (*argrest == 'q')
3178 queue_2stage = TRUE;
3182 /* -qi...: Do only first (initial) deliveries */
3184 if (*argrest == 'i')
3186 queue_run_first_delivery = TRUE;
3190 /* -qf...: Run the queue, forcing deliveries
3191 -qff..: Ditto, forcing thawing as well */
3193 if (*argrest == 'f')
3195 queue_run_force = TRUE;
3196 if (*(++argrest) == 'f')
3198 deliver_force_thaw = TRUE;
3203 /* -q[f][f]l...: Run the queue only on local deliveries */
3205 if (*argrest == 'l')
3207 queue_run_local = TRUE;
3211 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3212 optionally starting from a given message id. */
3214 if (*argrest == 0 &&
3215 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3218 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3219 start_queue_run_id = argv[++i];
3220 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3221 stop_queue_run_id = argv[++i];
3224 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3225 optionally local only. */
3230 queue_interval = readconf_readtime(argrest, 0, FALSE);
3232 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3233 if (queue_interval <= 0)
3235 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3242 case 'R': /* Synonymous with -qR... */
3243 receiving_message = FALSE;
3245 /* -Rf: As -R (below) but force all deliveries,
3246 -Rff: Ditto, but also thaw all frozen messages,
3247 -Rr: String is regex
3248 -Rrf: Regex and force
3249 -Rrff: Regex and force and thaw
3251 in all cases provided there are no further characters in this
3257 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3259 if (Ustrcmp(argrest, rsopts[i]) == 0)
3261 if (i != 2) queue_run_force = TRUE;
3262 if (i >= 2) deliver_selectstring_regex = TRUE;
3263 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3264 argrest += Ustrlen(rsopts[i]);
3269 /* -R: Set string to match in addresses for forced queue run to
3270 pick out particular messages. */
3274 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3276 fprintf(stderr, "exim: string expected after -R\n");
3280 else deliver_selectstring = argrest;
3284 /* -r: an obsolete synonym for -f (see above) */
3287 /* -S: Like -R but works on sender. */
3289 case 'S': /* Synonymous with -qS... */
3290 receiving_message = FALSE;
3292 /* -Sf: As -S (below) but force all deliveries,
3293 -Sff: Ditto, but also thaw all frozen messages,
3294 -Sr: String is regex
3295 -Srf: Regex and force
3296 -Srff: Regex and force and thaw
3298 in all cases provided there are no further characters in this
3304 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3306 if (Ustrcmp(argrest, rsopts[i]) == 0)
3308 if (i != 2) queue_run_force = TRUE;
3309 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3310 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3311 argrest += Ustrlen(rsopts[i]);
3316 /* -S: Set string to match in addresses for forced queue run to
3317 pick out particular messages. */
3321 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3323 fprintf(stderr, "exim: string expected after -S\n");
3327 else deliver_selectstring_sender = argrest;
3330 /* -Tqt is an option that is exclusively for use by the testing suite.
3331 It is not recognized in other circumstances. It allows for the setting up
3332 of explicit "queue times" so that various warning/retry things can be
3333 tested. Otherwise variability of clock ticks etc. cause problems. */
3336 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3337 fudged_queue_times = argv[++i];
3342 /* -t: Set flag to extract recipients from body of message. */
3345 if (*argrest == 0) extract_recipients = TRUE;
3347 /* -ti: Set flag to extract recipients from body of message, and also
3348 specify that dot does not end the message. */
3350 else if (Ustrcmp(argrest, "i") == 0)
3352 extract_recipients = TRUE;
3356 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3359 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3366 /* -U: This means "initial user submission" in sendmail, apparently. The
3367 doc claims that in future sendmail may refuse syntactically invalid
3368 messages instead of fixing them. For the moment, we just ignore it. */
3374 /* -v: verify things - this is a very low-level debugging */
3379 debug_selector |= D_v;
3380 debug_file = stderr;
3386 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3388 The -x flag tells the sendmail command that mail from a local
3389 mail program has National Language Support (NLS) extended characters
3390 in the body of the mail item. The sendmail command can send mail with
3391 extended NLS characters across networks that normally corrupts these
3394 As Exim is 8-bit clean, it just ignores this flag. */
3397 if (*argrest != 0) badarg = TRUE;
3400 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3401 logs to that file. We swallow the parameter and otherwise ignore it. */
3404 if (*argrest == '\0')
3407 fprintf(stderr, "exim: string expected after -X\n");
3413 if (*argrest == '\0')
3414 if (++i < argc) log_oneline = argv[i]; else
3416 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3421 /* All other initial characters are errors */
3426 } /* End of high-level switch statement */
3428 /* Failed to recognize the option, or syntax error */
3432 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3433 "option %s\n", arg);
3439 /* If -R or -S have been specified without -q, assume a single queue run. */
3441 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3442 queue_interval < 0) queue_interval = 0;
3446 /* If usage_wanted is set we call the usage function - which never returns */
3447 if (usage_wanted) exim_usage(called_as);
3449 /* Arguments have been processed. Check for incompatibilities. */
3451 (smtp_input || extract_recipients || recipients_arg < argc) &&
3452 (daemon_listen || queue_interval >= 0 || bi_option ||
3453 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3454 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3457 msg_action_arg > 0 &&
3458 (daemon_listen || queue_interval >= 0 || list_options ||
3459 (checking && msg_action != MSG_LOAD) ||
3460 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3463 (daemon_listen || queue_interval >= 0) &&
3464 (sender_address != NULL || list_options || list_queue || checking ||
3468 daemon_listen && queue_interval == 0
3471 inetd_wait_mode && queue_interval >= 0
3475 (checking || smtp_input || extract_recipients ||
3476 filter_test != FTEST_NONE || bi_option)
3479 verify_address_mode &&
3480 (address_test_mode || smtp_input || extract_recipients ||
3481 filter_test != FTEST_NONE || bi_option)
3484 address_test_mode && (smtp_input || extract_recipients ||
3485 filter_test != FTEST_NONE || bi_option)
3488 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3492 deliver_selectstring != NULL && queue_interval < 0
3495 msg_action == MSG_LOAD &&
3496 (!expansion_test || expansion_test_message != NULL)
3500 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3504 /* If debugging is set up, set the file and the file descriptor to pass on to
3505 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3506 to run in the foreground. */
3508 if (debug_selector != 0)
3510 debug_file = stderr;
3511 debug_fd = fileno(debug_file);
3512 background_daemon = FALSE;
3513 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3514 if (debug_selector != D_v) /* -v only doesn't show this */
3516 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3517 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3519 if (!version_printed)
3520 show_whats_supported(stderr);
3524 /* When started with root privilege, ensure that the limits on the number of
3525 open files and the number of processes (where that is accessible) are
3526 sufficiently large, or are unset, in case Exim has been called from an
3527 environment where the limits are screwed down. Not all OS have the ability to
3528 change some of these limits. */
3532 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3538 #ifdef RLIMIT_NOFILE
3539 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3541 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3543 rlp.rlim_cur = rlp.rlim_max = 0;
3546 /* I originally chose 1000 as a nice big number that was unlikely to
3547 be exceeded. It turns out that some older OS have a fixed upper limit of
3550 if (rlp.rlim_cur < 1000)
3552 rlp.rlim_cur = rlp.rlim_max = 1000;
3553 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3555 rlp.rlim_cur = rlp.rlim_max = 256;
3556 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3557 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3564 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3566 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3568 rlp.rlim_cur = rlp.rlim_max = 0;
3571 #ifdef RLIM_INFINITY
3572 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3574 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3576 if (rlp.rlim_cur < 1000)
3578 rlp.rlim_cur = rlp.rlim_max = 1000;
3580 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3581 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3587 /* Exim is normally entered as root (but some special configurations are
3588 possible that don't do this). However, it always spins off sub-processes that
3589 set their uid and gid as required for local delivery. We don't want to pass on
3590 any extra groups that root may belong to, so we want to get rid of them all at
3593 We need to obey setgroups() at this stage, before possibly giving up root
3594 privilege for a changed configuration file, but later on we might need to
3595 check on the additional groups for the admin user privilege - can't do that
3596 till after reading the config, which might specify the exim gid. Therefore,
3597 save the group list here first. */
3599 group_count = getgroups(NGROUPS_MAX, group_list);
3600 if (group_count < 0)
3602 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3606 /* There is a fundamental difference in some BSD systems in the matter of
3607 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3608 known not to be different. On the "different" systems there is a single group
3609 list, and the first entry in it is the current group. On all other versions of
3610 Unix there is a supplementary group list, which is in *addition* to the current
3611 group. Consequently, to get rid of all extraneous groups on a "standard" system
3612 you pass over 0 groups to setgroups(), while on a "different" system you pass
3613 over a single group - the current group, which is always the first group in the
3614 list. Calling setgroups() with zero groups on a "different" system results in
3615 an error return. The following code should cope with both types of system.
3617 However, if this process isn't running as root, setgroups() can't be used
3618 since you have to be root to run it, even if throwing away groups. Not being
3619 root here happens only in some unusual configurations. We just ignore the
3622 if (setgroups(0, NULL) != 0)
3624 if (setgroups(1, group_list) != 0 && !unprivileged)
3626 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3631 /* If the configuration file name has been altered by an argument on the
3632 command line (either a new file name or a macro definition) and the caller is
3633 not root, or if this is a filter testing run, remove any setuid privilege the
3634 program has and run as the underlying user.
3636 The exim user is locked out of this, which severely restricts the use of -C
3639 Otherwise, set the real ids to the effective values (should be root unless run
3640 from inetd, which it can either be root or the exim uid, if one is configured).
3642 There is a private mechanism for bypassing some of this, in order to make it
3643 possible to test lots of configurations automatically, without having either to
3644 recompile each time, or to patch in an actual configuration file name and other
3645 values (such as the path name). If running in the test harness, pretend that
3646 configuration file changes and macro definitions haven't happened. */
3649 (!trusted_config || /* Config changed, or */
3650 !macros_trusted()) && /* impermissible macros and */
3651 real_uid != root_uid && /* Not root, and */
3652 !running_in_test_harness /* Not fudged */
3654 expansion_test /* expansion testing */
3656 filter_test != FTEST_NONE) /* Filter testing */
3658 setgroups(group_count, group_list);
3659 exim_setugid(real_uid, real_gid, FALSE,
3660 US"-C, -D, -be or -bf forces real uid");
3661 removed_privilege = TRUE;
3663 /* In the normal case when Exim is called like this, stderr is available
3664 and should be used for any logging information because attempts to write
3665 to the log will usually fail. To arrange this, we unset really_exim. However,
3666 if no stderr is available there is no point - we might as well have a go
3667 at the log (if it fails, syslog will be written).
3669 Note that if the invoker is Exim, the logs remain available. Messing with
3670 this causes unlogged successful deliveries. */
3672 if ((log_stderr != NULL) && (real_uid != exim_uid))
3673 really_exim = FALSE;
3676 /* Privilege is to be retained for the moment. It may be dropped later,
3677 depending on the job that this Exim process has been asked to do. For now, set
3678 the real uid to the effective so that subsequent re-execs of Exim are done by a
3681 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3683 /* If testing a filter, open the file(s) now, before wasting time doing other
3684 setups and reading the message. */
3686 if ((filter_test & FTEST_SYSTEM) != 0)
3688 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3691 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3693 return EXIT_FAILURE;
3697 if ((filter_test & FTEST_USER) != 0)
3699 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3702 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3704 return EXIT_FAILURE;
3708 /* Initialise lookup_list
3709 If debugging, already called above via version reporting.
3710 In either case, we initialise the list of available lookups while running
3711 as root. All dynamically modules are loaded from a directory which is
3712 hard-coded into the binary and is code which, if not a module, would be
3713 part of Exim already. Ability to modify the content of the directory
3714 is equivalent to the ability to modify a setuid binary!
3716 This needs to happen before we read the main configuration. */
3719 #ifdef EXPERIMENTAL_INTERNATIONAL
3720 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3723 /* Read the main runtime configuration data; this gives up if there
3724 is a failure. It leaves the configuration file open so that the subsequent
3725 configuration data for delivery can be read if needed. */
3729 /* If an action on specific messages is requested, or if a daemon or queue
3730 runner is being started, we need to know if Exim was called by an admin user.
3731 This is the case if the real user is root or exim, or if the real group is
3732 exim, or if one of the supplementary groups is exim or a group listed in
3733 admin_groups. We don't fail all message actions immediately if not admin_user,
3734 since some actions can be performed by non-admin users. Instead, set admin_user
3735 for later interrogation. */
3737 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3742 for (i = 0; i < group_count; i++)
3744 if (group_list[i] == exim_gid) admin_user = TRUE;
3745 else if (admin_groups != NULL)
3747 for (j = 1; j <= (int)(admin_groups[0]); j++)
3748 if (admin_groups[j] == group_list[i])
3749 { admin_user = TRUE; break; }
3751 if (admin_user) break;
3755 /* Another group of privileged users are the trusted users. These are root,
3756 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3757 are permitted to specify sender_addresses with -f on the command line, and
3758 other message parameters as well. */
3760 if (real_uid == root_uid || real_uid == exim_uid)
3761 trusted_caller = TRUE;
3766 if (trusted_users != NULL)
3768 for (i = 1; i <= (int)(trusted_users[0]); i++)
3769 if (trusted_users[i] == real_uid)
3770 { trusted_caller = TRUE; break; }
3773 if (!trusted_caller && trusted_groups != NULL)
3775 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3777 if (trusted_groups[i] == real_gid)
3778 trusted_caller = TRUE;
3779 else for (j = 0; j < group_count; j++)
3781 if (trusted_groups[i] == group_list[j])
3782 { trusted_caller = TRUE; break; }
3784 if (trusted_caller) break;
3789 /* Handle the decoding of logging options. */
3791 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3792 log_selector_string, log_options, log_options_count, US"log", 0);
3796 debug_printf("configuration file is %s\n", config_main_filename);
3797 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3798 log_extra_selector);
3801 /* If domain literals are not allowed, check the sender address that was
3802 supplied with -f. Ditto for a stripped trailing dot. */
3804 if (sender_address != NULL)
3806 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3808 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3809 "allowed\n", sender_address);
3810 return EXIT_FAILURE;
3812 if (f_end_dot && !strip_trailing_dot)
3814 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3815 "(trailing dot not allowed)\n", sender_address);
3816 return EXIT_FAILURE;
3820 /* See if an admin user overrode our logging. */
3822 if (cmdline_syslog_name != NULL)
3826 syslog_processname = cmdline_syslog_name;
3827 log_file_path = string_copy(CUS"syslog");
3831 /* not a panic, non-privileged users should not be able to spam paniclog */
3833 "exim: you lack sufficient privilege to specify syslog process name\n");
3834 return EXIT_FAILURE;
3838 /* Paranoia check of maximum lengths of certain strings. There is a check
3839 on the length of the log file path in log.c, which will come into effect
3840 if there are any calls to write the log earlier than this. However, if we
3841 get this far but the string is very long, it is better to stop now than to
3842 carry on and (e.g.) receive a message and then have to collapse. The call to
3843 log_write() from here will cause the ultimate panic collapse if the complete
3844 file name exceeds the buffer length. */
3846 if (Ustrlen(log_file_path) > 200)
3847 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3848 "log_file_path is longer than 200 chars: aborting");
3850 if (Ustrlen(pid_file_path) > 200)
3851 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3852 "pid_file_path is longer than 200 chars: aborting");
3854 if (Ustrlen(spool_directory) > 200)
3855 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3856 "spool_directory is longer than 200 chars: aborting");
3858 /* Length check on the process name given to syslog for its TAG field,
3859 which is only permitted to be 32 characters or less. See RFC 3164. */
3861 if (Ustrlen(syslog_processname) > 32)
3862 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3863 "syslog_processname is longer than 32 chars: aborting");
3869 log_write(0, LOG_MAIN, "%s", log_oneline);
3870 return EXIT_SUCCESS;
3873 return EXIT_FAILURE;
3876 /* In some operating systems, the environment variable TMPDIR controls where
3877 temporary files are created; Exim doesn't use these (apart from when delivering
3878 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3879 If TMPDIR is found in the environment, reset it to the value defined in the
3880 TMPDIR macro, if this macro is defined. */
3885 for (p = USS environ; *p != NULL; p++)
3887 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3888 Ustrcmp(*p+7, TMPDIR) != 0)
3890 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3891 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3893 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3899 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3900 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3901 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3902 called by a user who has set the TZ variable. This then affects the timestamps
3903 in log files and in Received: headers, and any created Date: header lines. The
3904 required timezone is settable in the configuration file, so nothing can be done
3905 about this earlier - but hopefully nothing will normally be logged earlier than
3906 this. We have to make a new environment if TZ is wrong, but don't bother if
3907 timestamps_utc is set, because then all times are in UTC anyway. */
3909 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3911 timestamps_utc = TRUE;
3915 uschar *envtz = US getenv("TZ");
3916 if ((envtz == NULL && timezone_string != NULL) ||
3918 (timezone_string == NULL ||
3919 Ustrcmp(timezone_string, envtz) != 0)))
3921 uschar **p = USS environ;
3925 while (*p++ != NULL) count++;
3926 if (envtz == NULL) count++;
3927 newp = new = malloc(sizeof(uschar *) * (count + 1));
3928 for (p = USS environ; *p != NULL; p++)
3930 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3933 if (timezone_string != NULL)
3935 *newp = malloc(Ustrlen(timezone_string) + 4);
3936 sprintf(CS *newp++, "TZ=%s", timezone_string);
3941 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3942 tod_stamp(tod_log));
3946 /* Handle the case when we have removed the setuid privilege because of -C or
3947 -D. This means that the caller of Exim was not root.
3949 There is a problem if we were running as the Exim user. The sysadmin may
3950 expect this case to retain privilege because "the binary was called by the
3951 Exim user", but it hasn't, because either the -D option set macros, or the
3952 -C option set a non-trusted configuration file. There are two possibilities:
3954 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3955 to do message deliveries. Thus, the fact that it is running as a
3956 non-privileged user is plausible, and might be wanted in some special
3957 configurations. However, really_exim will have been set false when
3958 privilege was dropped, to stop Exim trying to write to its normal log
3959 files. Therefore, re-enable normal log processing, assuming the sysadmin
3960 has set up the log directory correctly.
3962 (2) If deliver_drop_privilege is not set, the configuration won't work as
3963 apparently intended, and so we log a panic message. In order to retain
3964 root for -C or -D, the caller must either be root or be invoking a
3965 trusted configuration file (when deliver_drop_privilege is false). */
3967 if (removed_privilege && (!trusted_config || macros != NULL) &&
3968 real_uid == exim_uid)
3970 if (deliver_drop_privilege)
3971 really_exim = TRUE; /* let logging work normally */
3973 log_write(0, LOG_MAIN|LOG_PANIC,
3974 "exim user lost privilege for using %s option",
3975 trusted_config? "-D" : "-C");
3978 /* Start up Perl interpreter if Perl support is configured and there is a
3979 perl_startup option, and the configuration or the command line specifies
3980 initializing starting. Note that the global variables are actually called
3981 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3984 if (perl_start_option != 0)
3985 opt_perl_at_start = (perl_start_option > 0);
3986 if (opt_perl_at_start && opt_perl_startup != NULL)
3989 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3990 errstr = init_perl(opt_perl_startup);
3993 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3994 return EXIT_FAILURE;
3996 opt_perl_started = TRUE;
3998 #endif /* EXIM_PERL */
4000 /* Log the arguments of the call if the configuration file said so. This is
4001 a debugging feature for finding out what arguments certain MUAs actually use.
4002 Don't attempt it if logging is disabled, or if listing variables or if
4003 verifying/testing addresses or expansions. */
4005 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
4006 && really_exim && !list_options && !checking)
4009 uschar *p = big_buffer;
4011 Ustrcpy(p, "cwd= (failed)");
4012 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4014 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4016 for (i = 0; i < argc; i++)
4018 int len = Ustrlen(argv[i]);
4019 const uschar *printing;
4021 if (p + len + 8 >= big_buffer + big_buffer_size)
4024 log_write(0, LOG_MAIN, "%s", big_buffer);
4025 Ustrcpy(big_buffer, "...");
4028 printing = string_printing(argv[i]);
4029 if (printing[0] == 0) quote = US"\""; else
4031 const uschar *pp = printing;
4033 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4035 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4036 (p - big_buffer) - 4), printing, quote);
4040 if ((log_extra_selector & LX_arguments) != 0)
4041 log_write(0, LOG_MAIN, "%s", big_buffer);
4043 debug_printf("%s\n", big_buffer);
4046 /* Set the working directory to be the top-level spool directory. We don't rely
4047 on this in the code, which always uses fully qualified names, but it's useful
4048 for core dumps etc. Don't complain if it fails - the spool directory might not
4049 be generally accessible and calls with the -C option (and others) have lost
4050 privilege by now. Before the chdir, we try to ensure that the directory exists.
4053 if (Uchdir(spool_directory) != 0)
4056 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4057 dummy = /* quieten compiler */ Uchdir(spool_directory);
4060 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4061 alias file. Exim doesn't have such a concept, but this call is screwed into
4062 Sun's YP makefiles. Handle this by calling a configured script, as the real
4063 user who called Exim. The -oA option can be used to pass an argument to the
4068 (void)fclose(config_file);
4069 if (bi_command != NULL)
4073 argv[i++] = bi_command;
4074 if (alias_arg != NULL) argv[i++] = alias_arg;
4077 setgroups(group_count, group_list);
4078 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4080 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4081 (argv[1] == NULL)? US"" : argv[1]);
4083 execv(CS argv[0], (char *const *)argv);
4084 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4089 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4094 /* We moved the admin/trusted check to be immediately after reading the
4095 configuration file. We leave these prints here to ensure that syslog setup,
4096 logfile setup, and so on has already happened. */
4098 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4099 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4101 /* Only an admin user may start the daemon or force a queue run in the default
4102 configuration, but the queue run restriction can be relaxed. Only an admin
4103 user may request that a message be returned to its sender forthwith. Only an
4104 admin user may specify a debug level greater than D_v (because it might show
4105 passwords, etc. in lookup queries). Only an admin user may request a queue
4106 count. Only an admin user can use the test interface to scan for email
4107 (because Exim will be in the spool dir and able to look at mails). */
4111 BOOL debugset = (debug_selector & ~D_v) != 0;
4112 if (deliver_give_up || daemon_listen || malware_test_file ||
4113 (count_queue && queue_list_requires_admin) ||
4114 (list_queue && queue_list_requires_admin) ||
4115 (queue_interval >= 0 && prod_requires_admin) ||
4116 (debugset && !running_in_test_harness))
4118 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4123 /* If the real user is not root or the exim uid, the argument for passing
4124 in an open TCP/IP connection for another message is not permitted, nor is
4125 running with the -N option for any delivery action, unless this call to exim is
4126 one that supplied an input message, or we are using a patched exim for
4127 regression testing. */
4129 if (real_uid != root_uid && real_uid != exim_uid &&
4130 (continue_hostname != NULL ||
4132 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4133 )) && !running_in_test_harness)
4135 fprintf(stderr, "exim: Permission denied\n");
4136 return EXIT_FAILURE;
4139 /* If the caller is not trusted, certain arguments are ignored when running for
4140 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4141 Note that authority for performing certain actions on messages is tested in the
4142 queue_action() function. */
4144 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4146 sender_host_name = sender_host_address = interface_address =
4147 sender_ident = received_protocol = NULL;
4148 sender_host_port = interface_port = 0;
4149 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4152 /* If a sender host address is set, extract the optional port number off the
4153 end of it and check its syntax. Do the same thing for the interface address.
4154 Exim exits if the syntax is bad. */
4158 if (sender_host_address != NULL)
4159 sender_host_port = check_port(sender_host_address);
4160 if (interface_address != NULL)
4161 interface_port = check_port(interface_address);
4164 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4169 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4170 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4174 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4175 return EXIT_FAILURE;
4179 /* If an SMTP message is being received check to see if the standard input is a
4180 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4181 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4186 union sockaddr_46 inetd_sock;
4187 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4188 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4190 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4191 if (family == AF_INET || family == AF_INET6)
4193 union sockaddr_46 interface_sock;
4194 size = sizeof(interface_sock);
4196 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4197 interface_address = host_ntoa(-1, &interface_sock, NULL,
4200 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4202 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4205 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4206 NULL, &sender_host_port);
4207 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4208 "inetd is not supported when mua_wrapper is set");
4213 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4214 return EXIT_FAILURE;
4220 /* If the load average is going to be needed while receiving a message, get it
4221 now for those OS that require the first call to os_getloadavg() to be done as
4222 root. There will be further calls later for each message received. */
4224 #ifdef LOAD_AVG_NEEDS_ROOT
4225 if (receiving_message &&
4226 (queue_only_load >= 0 ||
4227 (is_inetd && smtp_load_reserve >= 0)
4230 load_average = OS_GETLOADAVG();
4234 /* The queue_only configuration option can be overridden by -odx on the command
4235 line, except that if queue_only_override is false, queue_only cannot be unset
4236 from the command line. */
4238 if (queue_only_set && (queue_only_override || arg_queue_only))
4239 queue_only = arg_queue_only;
4241 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4244 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4245 if (arg_smtp_receive_timeout >= 0)
4246 smtp_receive_timeout = arg_smtp_receive_timeout;
4248 /* If Exim was started with root privilege, unless we have already removed the
4249 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4250 except when starting the daemon or doing some kind of delivery or address
4251 testing (-bt). These are the only cases when root need to be retained. We run
4252 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4253 retained only for starting the daemon. We always do the initgroups() in this
4254 situation (controlled by the TRUE below), in order to be as close as possible
4255 to the state Exim usually runs in. */
4257 if (!unprivileged && /* originally had root AND */
4258 !removed_privilege && /* still got root AND */
4259 !daemon_listen && /* not starting the daemon */
4260 queue_interval <= 0 && /* (either kind of daemon) */
4262 deliver_drop_privilege || /* requested unprivileged */
4264 queue_interval < 0 && /* not running the queue */
4265 (msg_action_arg < 0 || /* and */
4266 msg_action != MSG_DELIVER) && /* not delivering and */
4267 (!checking || !address_test_mode) /* not address checking */
4271 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4274 /* When we are retaining a privileged uid, we still change to the exim gid. */
4279 rv = setgid(exim_gid);
4280 /* Impact of failure is that some stuff might end up with an incorrect group.
4281 We track this for failures from root, since any attempt to change privilege
4282 by root should succeed and failures should be examined. For non-root,
4283 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4284 no need to complain then. */
4287 if (!(unprivileged || removed_privilege))
4290 "exim: changing group failed: %s\n", strerror(errno));
4294 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4295 (long int)exim_gid, strerror(errno));
4299 /* Handle a request to scan a file for malware */
4300 if (malware_test_file)
4302 #ifdef WITH_CONTENT_SCAN
4304 set_process_info("scanning file for malware");
4305 result = malware_in_file(malware_test_file);
4308 printf("No malware found.\n");
4313 printf("Malware lookup returned non-okay/fail: %d\n", result);
4317 printf("Malware found: %s\n", malware_name);
4319 printf("Malware scan detected malware of unknown name.\n");
4321 printf("Malware scanning not enabled at compile time.\n");
4326 /* Handle a request to list the delivery queue */
4330 set_process_info("listing the queue");
4331 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4335 /* Handle a request to count the delivery queue */
4339 set_process_info("counting the queue");
4344 /* Handle actions on specific messages, except for the force delivery and
4345 message load actions, which are done below. Some actions take a whole list of
4346 message ids, which are known to continue up to the end of the arguments. Others
4347 take a single message id and then operate on the recipients list. */
4349 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4351 int yield = EXIT_SUCCESS;
4352 set_process_info("acting on specified messages");
4354 if (!one_msg_action)
4356 for (i = msg_action_arg; i < argc; i++)
4357 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4358 yield = EXIT_FAILURE;
4361 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4362 recipients_arg)) yield = EXIT_FAILURE;
4366 /* We used to set up here to skip reading the ACL section, on
4367 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4368 Now, since the intro of the ${acl } expansion, ACL definitions may be
4369 needed in transports so we lost the optimisation. */
4373 /* The configuration data will have been read into POOL_PERM because we won't
4374 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4375 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4376 configuration were read into POOL_MAIN, because we don't do any resets till
4377 later on. However, it seems right, and it does ensure that both pools get used.
4380 store_pool = POOL_MAIN;
4382 /* Handle the -brt option. This is for checking out retry configurations.
4383 The next three arguments are a domain name or a complete address, and
4384 optionally two error numbers. All it does is to call the function that
4385 scans the retry configuration data. */
4387 if (test_retry_arg >= 0)
4389 retry_config *yield;
4390 int basic_errno = 0;
4394 if (test_retry_arg >= argc)
4396 printf("-brt needs a domain or address argument\n");
4397 exim_exit(EXIT_FAILURE);
4399 s1 = argv[test_retry_arg++];
4402 /* If the first argument contains no @ and no . it might be a local user
4403 or it might be a single-component name. Treat as a domain. */
4405 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4407 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4408 "being \ntreated as a one-component domain, not as a local part.\n\n",
4412 /* There may be an optional second domain arg. */
4414 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4415 s2 = argv[test_retry_arg++];
4417 /* The final arg is an error name */
4419 if (test_retry_arg < argc)
4421 uschar *ss = argv[test_retry_arg];
4423 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4426 printf("%s\n", CS error);
4427 return EXIT_FAILURE;
4430 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4431 code > 100 as an error is for matching codes to the decade. Turn them into
4432 a real error code, off the decade. */
4434 if (basic_errno == ERRNO_MAIL4XX ||
4435 basic_errno == ERRNO_RCPT4XX ||
4436 basic_errno == ERRNO_DATA4XX)
4438 int code = (more_errno >> 8) & 255;
4440 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4441 else if (code > 100)
4442 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4446 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4447 if (yield == NULL) printf("No retry information found\n"); else
4450 more_errno = yield->more_errno;
4451 printf("Retry rule: %s ", yield->pattern);
4453 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4455 printf("quota%s%s ",
4456 (more_errno > 0)? "_" : "",
4457 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4459 else if (yield->basic_errno == ECONNREFUSED)
4461 printf("refused%s%s ",
4462 (more_errno > 0)? "_" : "",
4463 (more_errno == 'M')? "MX" :
4464 (more_errno == 'A')? "A" : "");
4466 else if (yield->basic_errno == ETIMEDOUT)
4469 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4471 if (more_errno != 0) printf("_%s",
4472 (more_errno == 'M')? "MX" : "A");
4475 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4476 printf("auth_failed ");
4479 for (r = yield->rules; r != NULL; r = r->next)
4481 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4482 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4488 printf(",%d.", x/1000);
4502 exim_exit(EXIT_SUCCESS);
4505 /* Handle a request to list one or more configuration options */
4506 /* If -n was set, we suppress some information */
4510 set_process_info("listing variables");
4511 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4512 else for (i = recipients_arg; i < argc; i++)
4515 (Ustrcmp(argv[i], "router") == 0 ||
4516 Ustrcmp(argv[i], "transport") == 0 ||
4517 Ustrcmp(argv[i], "authenticator") == 0 ||
4518 Ustrcmp(argv[i], "macro") == 0))
4520 readconf_print(argv[i+1], argv[i], flag_n);
4523 else readconf_print(argv[i], NULL, flag_n);
4525 exim_exit(EXIT_SUCCESS);
4529 /* Handle a request to deliver one or more messages that are already on the
4530 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4531 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4533 Delivery of specific messages is typically used for a small number when
4534 prodding by hand (when the option forced_delivery will be set) or when
4535 re-execing to regain root privilege. Each message delivery must happen in a
4536 separate process, so we fork a process for each one, and run them sequentially
4537 so that debugging output doesn't get intertwined, and to avoid spawning too
4538 many processes if a long list is given. However, don't fork for the last one;
4539 this saves a process in the common case when Exim is called to deliver just one
4542 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4544 if (prod_requires_admin && !admin_user)
4546 fprintf(stderr, "exim: Permission denied\n");
4547 exim_exit(EXIT_FAILURE);
4549 set_process_info("delivering specified messages");
4550 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4551 for (i = msg_action_arg; i < argc; i++)
4556 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4557 else if ((pid = fork()) == 0)
4559 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4560 _exit(EXIT_SUCCESS);
4564 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4566 exim_exit(EXIT_FAILURE);
4570 exim_exit(EXIT_SUCCESS);
4574 /* If only a single queue run is requested, without SMTP listening, we can just
4575 turn into a queue runner, with an optional starting message id. */
4577 if (queue_interval == 0 && !daemon_listen)
4579 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4580 (start_queue_run_id == NULL)? US"" : US" starting at ",
4581 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4582 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4583 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4584 set_process_info("running the queue (single queue run)");
4585 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4586 exim_exit(EXIT_SUCCESS);
4590 /* Find the login name of the real user running this process. This is always
4591 needed when receiving a message, because it is written into the spool file. It
4592 may also be used to construct a from: or a sender: header, and in this case we
4593 need the user's full name as well, so save a copy of it, checked for RFC822
4594 syntax and munged if necessary, if it hasn't previously been set by the -F
4595 argument. We may try to get the passwd entry more than once, in case NIS or
4596 other delays are in evidence. Save the home directory for use in filter testing
4601 if ((pw = getpwuid(real_uid)) != NULL)
4603 originator_login = string_copy(US pw->pw_name);
4604 originator_home = string_copy(US pw->pw_dir);
4606 /* If user name has not been set by -F, set it from the passwd entry
4607 unless -f has been used to set the sender address by a trusted user. */
4609 if (originator_name == NULL)
4611 if (sender_address == NULL ||
4612 (!trusted_caller && filter_test == FTEST_NONE))
4614 uschar *name = US pw->pw_gecos;
4615 uschar *amp = Ustrchr(name, '&');
4618 /* Most Unix specify that a '&' character in the gecos field is
4619 replaced by a copy of the login name, and some even specify that
4620 the first character should be upper cased, so that's what we do. */
4625 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4626 amp - name, name, &loffset, originator_login, amp + 1);
4627 buffer[loffset] = toupper(buffer[loffset]);
4631 /* If a pattern for matching the gecos field was supplied, apply
4632 it and then expand the name string. */
4634 if (gecos_pattern != NULL && gecos_name != NULL)
4637 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4639 if (regex_match_and_setup(re, name, 0, -1))
4641 uschar *new_name = expand_string(gecos_name);
4643 if (new_name != NULL)
4645 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4646 "gecos field \"%s\"\n", new_name, name);
4649 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4650 "\"%s\": %s\n", gecos_name, expand_string_message);
4652 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4653 "gecos field \"%s\"\n", gecos_pattern, name);
4654 store_free((void *)re);
4656 originator_name = string_copy(name);
4659 /* A trusted caller has used -f but not -F */
4661 else originator_name = US"";
4664 /* Break the retry loop */
4669 if (++i > finduser_retries) break;
4673 /* If we cannot get a user login, log the incident and give up, unless the
4674 configuration specifies something to use. When running in the test harness,
4675 any setting of unknown_login overrides the actual name. */
4677 if (originator_login == NULL || running_in_test_harness)
4679 if (unknown_login != NULL)
4681 originator_login = expand_string(unknown_login);
4682 if (originator_name == NULL && unknown_username != NULL)
4683 originator_name = expand_string(unknown_username);
4684 if (originator_name == NULL) originator_name = US"";
4686 if (originator_login == NULL)
4687 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4691 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4694 originator_name = string_copy(parse_fix_phrase(originator_name,
4695 Ustrlen(originator_name), big_buffer, big_buffer_size));
4697 /* If a message is created by this call of Exim, the uid/gid of its originator
4698 are those of the caller. These values are overridden if an existing message is
4699 read in from the spool. */
4701 originator_uid = real_uid;
4702 originator_gid = real_gid;
4704 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4705 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4707 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4708 returns. We leave this till here so that the originator_ fields are available
4709 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4712 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4716 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4717 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4718 "mua_wrapper is set");
4723 /* If the sender ident has not been set (by a trusted caller) set it to
4724 the caller. This will get overwritten below for an inetd call. If a trusted
4725 caller has set it empty, unset it. */
4727 if (sender_ident == NULL) sender_ident = originator_login;
4728 else if (sender_ident[0] == 0) sender_ident = NULL;
4730 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4731 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4732 originator_* variables set. */
4734 if (test_rewrite_arg >= 0)
4736 really_exim = FALSE;
4737 if (test_rewrite_arg >= argc)
4739 printf("-brw needs an address argument\n");
4740 exim_exit(EXIT_FAILURE);
4742 rewrite_test(argv[test_rewrite_arg]);
4743 exim_exit(EXIT_SUCCESS);
4746 /* A locally-supplied message is considered to be coming from a local user
4747 unless a trusted caller supplies a sender address with -f, or is passing in the
4748 message via SMTP (inetd invocation or otherwise). */
4750 if ((sender_address == NULL && !smtp_input) ||
4751 (!trusted_caller && filter_test == FTEST_NONE))
4753 sender_local = TRUE;
4755 /* A trusted caller can supply authenticated_sender and authenticated_id
4756 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4757 defaults except when host checking. */
4759 if (authenticated_sender == NULL && !host_checking)
4760 authenticated_sender = string_sprintf("%s@%s", originator_login,
4761 qualify_domain_sender);
4762 if (authenticated_id == NULL && !host_checking)
4763 authenticated_id = originator_login;
4766 /* Trusted callers are always permitted to specify the sender address.
4767 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4768 is specified is the empty address. However, if a trusted caller does not
4769 specify a sender address for SMTP input, we leave sender_address unset. This
4770 causes the MAIL commands to be honoured. */
4772 if ((!smtp_input && sender_address == NULL) ||
4773 !receive_check_set_sender(sender_address))
4775 /* Either the caller is not permitted to set a general sender, or this is
4776 non-SMTP input and the trusted caller has not set a sender. If there is no
4777 sender, or if a sender other than <> is set, override with the originator's
4778 login (which will get qualified below), except when checking things. */
4780 if (sender_address == NULL /* No sender_address set */
4782 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4783 !checking && /* Not running tests, AND */
4784 filter_test == FTEST_NONE)) /* Not testing a filter */
4786 sender_address = originator_login;
4787 sender_address_forced = FALSE;
4788 sender_address_domain = 0;
4792 /* Remember whether an untrusted caller set the sender address */
4794 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4796 /* Ensure that the sender address is fully qualified unless it is the empty
4797 address, which indicates an error message, or doesn't exist (root caller, smtp
4798 interface, no -f argument). */
4800 if (sender_address != NULL && sender_address[0] != 0 &&
4801 sender_address_domain == 0)
4802 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4803 qualify_domain_sender);
4805 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4807 /* Handle a request to verify a list of addresses, or test them for delivery.
4808 This must follow the setting of the sender address, since routers can be
4809 predicated upon the sender. If no arguments are given, read addresses from
4810 stdin. Set debug_level to at least D_v to get full output for address testing.
4813 if (verify_address_mode || address_test_mode)
4816 int flags = vopt_qualify;
4818 if (verify_address_mode)
4820 if (!verify_as_sender) flags |= vopt_is_recipient;
4821 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4826 flags |= vopt_is_recipient;
4827 debug_selector |= D_v;
4828 debug_file = stderr;
4829 debug_fd = fileno(debug_file);
4830 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4833 if (recipients_arg < argc)
4835 while (recipients_arg < argc)
4837 uschar *s = argv[recipients_arg++];
4840 BOOL finished = FALSE;
4841 uschar *ss = parse_find_address_end(s, FALSE);
4842 if (*ss == ',') *ss = 0; else finished = TRUE;
4843 test_address(s, flags, &exit_value);
4846 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4853 uschar *s = get_stdinput(NULL, NULL);
4854 if (s == NULL) break;
4855 test_address(s, flags, &exit_value);
4859 exim_exit(exit_value);
4862 /* Handle expansion checking. Either expand items on the command line, or read
4863 from stdin if there aren't any. If -Mset was specified, load the message so
4864 that its variables can be used, but restrict this facility to admin users.
4865 Otherwise, if -bem was used, read a message from stdin. */
4869 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4871 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4874 fprintf(stderr, "exim: permission denied\n");
4877 message_id = argv[msg_action_arg];
4878 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4879 if (!spool_open_datafile(message_id))
4880 printf ("Failed to load message datafile %s\n", message_id);
4881 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4882 printf ("Failed to load message %s\n", message_id);
4885 /* Read a test message from a file. We fudge it up to be on stdin, saving
4886 stdin itself for later reading of expansion strings. */
4888 else if (expansion_test_message != NULL)
4890 int save_stdin = dup(0);
4891 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4894 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4896 return EXIT_FAILURE;
4899 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4900 message_ended = END_NOTENDED;
4901 read_message_body(receive_msg(extract_recipients));
4902 message_linecount += body_linecount;
4903 (void)dup2(save_stdin, 0);
4904 (void)close(save_stdin);
4905 clearerr(stdin); /* Required by Darwin */
4908 /* Allow $recipients for this testing */
4910 enable_dollar_recipients = TRUE;
4912 /* Expand command line items */
4914 if (recipients_arg < argc)
4916 while (recipients_arg < argc)
4918 uschar *s = argv[recipients_arg++];
4919 uschar *ss = expand_string(s);
4920 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4921 else printf("%s\n", CS ss);
4929 char *(*fn_readline)(const char *) = NULL;
4930 void (*fn_addhist)(const char *) = NULL;
4933 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4939 uschar *source = get_stdinput(fn_readline, fn_addhist);
4940 if (source == NULL) break;
4941 ss = expand_string(source);
4943 printf ("Failed: %s\n", expand_string_message);
4944 else printf("%s\n", CS ss);
4948 if (dlhandle != NULL) dlclose(dlhandle);
4952 /* The data file will be open after -Mset */
4954 if (deliver_datafile >= 0)
4956 (void)close(deliver_datafile);
4957 deliver_datafile = -1;
4960 exim_exit(EXIT_SUCCESS);
4964 /* The active host name is normally the primary host name, but it can be varied
4965 for hosts that want to play several parts at once. We need to ensure that it is
4966 set for host checking, and for receiving messages. */
4968 smtp_active_hostname = primary_hostname;
4969 if (raw_active_hostname != NULL)
4971 uschar *nah = expand_string(raw_active_hostname);
4974 if (!expand_string_forcedfail)
4975 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4976 "(smtp_active_hostname): %s", raw_active_hostname,
4977 expand_string_message);
4979 else if (nah[0] != 0) smtp_active_hostname = nah;
4982 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4983 given IP address so that the blocking and relay configuration can be tested.
4984 Unless a sender_ident was set by -oMt, we discard it (the default is the
4985 caller's login name). An RFC 1413 call is made only if we are running in the
4986 test harness and an incoming interface and both ports are specified, because
4987 there is no TCP/IP call to find the ident for. */
4994 if (!sender_ident_set)
4996 sender_ident = NULL;
4997 if (running_in_test_harness && sender_host_port != 0 &&
4998 interface_address != NULL && interface_port != 0)
4999 verify_get_ident(1413);
5002 /* In case the given address is a non-canonical IPv6 address, canonicize
5003 it. The code works for both IPv4 and IPv6, as it happens. */
5005 size = host_aton(sender_host_address, x);
5006 sender_host_address = store_get(48); /* large enough for full IPv6 */
5007 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5009 /* Now set up for testing */
5011 host_build_sender_fullhost();
5015 sender_local = FALSE;
5016 sender_host_notsocket = TRUE;
5017 debug_file = stderr;
5018 debug_fd = fileno(debug_file);
5019 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5020 "**** but without any ident (RFC 1413) callback.\n"
5021 "**** This is not for real!\n\n",
5022 sender_host_address);
5024 if (verify_check_host(&hosts_connection_nolog) == OK)
5025 log_write_selector &= ~L_smtp_connection;
5026 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5028 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5029 because a log line has already been written for all its failure exists
5030 (usually "connection refused: <reason>") and writing another one is
5031 unnecessary clutter. */
5033 if (smtp_start_session())
5035 reset_point = store_get(0);
5038 store_reset(reset_point);
5039 if (smtp_setup_msg() <= 0) break;
5040 if (!receive_msg(FALSE)) break;
5044 exim_exit(EXIT_SUCCESS);
5048 /* Arrange for message reception if recipients or SMTP were specified;
5049 otherwise complain unless a version print (-bV) happened or this is a filter
5050 verification test or info dump.
5051 In the former case, show the configuration file name. */
5053 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5055 if (version_printed)
5057 printf("Configuration file is %s\n", config_main_filename);
5058 return EXIT_SUCCESS;
5061 if (info_flag != CMDINFO_NONE)
5063 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5064 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5067 if (filter_test == FTEST_NONE)
5068 exim_usage(called_as);
5072 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5073 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5074 that we are not called from inetd, because that is rejected above. The
5075 following configuration settings are forced here:
5077 (1) Synchronous delivery (-odi)
5078 (2) Errors to stderr (-oep == -oeq)
5079 (3) No parallel remote delivery
5080 (4) Unprivileged delivery
5082 We don't force overall queueing options because there are several of them;
5083 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5084 to override any SMTP queueing. */
5088 synchronous_delivery = TRUE;
5089 arg_error_handling = ERRORS_STDERR;
5090 remote_max_parallel = 1;
5091 deliver_drop_privilege = TRUE;
5093 queue_smtp_domains = NULL;
5094 #ifdef EXPERIMENTAL_INTERNATIONAL
5095 message_utf8_downconvert = -1; /* convert-if-needed */
5100 /* Prepare to accept one or more new messages on the standard input. When a
5101 message has been read, its id is returned in message_id[]. If doing immediate
5102 delivery, we fork a delivery process for each received message, except for the
5103 last one, where we can save a process switch.
5105 It is only in non-smtp mode that error_handling is allowed to be changed from
5106 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5107 sendmail error modes other than -oem ever actually used? Later: yes.) */
5109 if (!smtp_input) error_handling = arg_error_handling;
5111 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5112 logging being sent down the socket and make an identd call to get the
5117 (void)fclose(stderr);
5118 exim_nullstd(); /* Re-open to /dev/null */
5119 verify_get_ident(IDENT_PORT);
5120 host_build_sender_fullhost();
5121 set_process_info("handling incoming connection from %s via inetd",
5125 /* If the sender host address has been set, build sender_fullhost if it hasn't
5126 already been done (which it will have been for inetd). This caters for the
5127 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5128 so that the test for IP options is skipped for -bs input. */
5130 if (sender_host_address != NULL && sender_fullhost == NULL)
5132 host_build_sender_fullhost();
5133 set_process_info("handling incoming connection from %s via -oMa",
5135 sender_host_notsocket = TRUE;
5138 /* Otherwise, set the sender host as unknown except for inetd calls. This
5139 prevents host checking in the case of -bs not from inetd and also for -bS. */
5141 else if (!is_inetd) sender_host_unknown = TRUE;
5143 /* If stdout does not exist, then dup stdin to stdout. This can happen
5144 if exim is started from inetd. In this case fd 0 will be set to the socket,
5145 but fd 1 will not be set. This also happens for passed SMTP channels. */
5147 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5149 /* Set up the incoming protocol name and the state of the program. Root is
5150 allowed to force received protocol via the -oMr option above. If we have come
5151 via inetd, the process info has already been set up. We don't set
5152 received_protocol here for smtp input, as it varies according to
5153 batch/HELO/EHLO/AUTH/TLS. */
5157 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5158 smtp_batched_input? "batched " : "",
5159 (sender_address!= NULL)? sender_address : originator_login);
5163 if (received_protocol == NULL)
5164 received_protocol = string_sprintf("local%s", called_as);
5165 set_process_info("accepting a local non-SMTP message from <%s>",
5169 /* Initialize the session_local_queue-only flag (this will be ignored if
5170 mua_wrapper is set) */
5173 session_local_queue_only = queue_only;
5175 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5176 the spool if so configured. On failure, we must not attempt to send an error
5177 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5178 error code is given.) */
5180 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5182 fprintf(stderr, "exim: insufficient disk space\n");
5183 return EXIT_FAILURE;
5186 /* If this is smtp input of any kind, real or batched, handle the start of the
5189 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5190 because a log line has already been written for all its failure exists
5191 (usually "connection refused: <reason>") and writing another one is
5192 unnecessary clutter. */
5198 if (verify_check_host(&hosts_connection_nolog) == OK)
5199 log_write_selector &= ~L_smtp_connection;
5200 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5201 if (!smtp_start_session())
5204 exim_exit(EXIT_SUCCESS);
5208 /* Otherwise, set up the input size limit here. */
5212 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5213 if (expand_string_message != NULL)
5215 if (thismessage_size_limit == -1)
5216 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5217 "message_size_limit: %s", expand_string_message);
5219 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5220 "message_size_limit: %s", expand_string_message);
5224 /* Loop for several messages when reading SMTP input. If we fork any child
5225 processes, we don't want to wait for them unless synchronous delivery is
5226 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5227 same as SIG_DFL, despite the fact that documentation often lists the default as
5228 "ignore". This is a confusing area. This is what I know:
5230 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5231 processes that complete simply to go away without ever becoming defunct. You
5232 can't then wait for them - but we don't want to wait for them in the
5233 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5234 happen for all OS (e.g. *BSD is different).
5236 But that's not the end of the story. Some (many? all?) systems have the
5237 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5238 has by default, so it seems that the difference is merely one of default
5239 (compare restarting vs non-restarting signals).
5241 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5242 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5243 of the loop below. Paranoia rules.
5245 February 2003: That's *still* not the end of the story. There are now versions
5246 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5247 process then calls waitpid(), a grumble is written to the system log, because
5248 this is logically inconsistent. In other words, it doesn't like the paranoia.
5249 As a consequenc of this, the waitpid() below is now excluded if we are sure
5250 that SIG_IGN works. */
5252 if (!synchronous_delivery)
5255 struct sigaction act;
5256 act.sa_handler = SIG_IGN;
5257 sigemptyset(&(act.sa_mask));
5258 act.sa_flags = SA_NOCLDWAIT;
5259 sigaction(SIGCHLD, &act, NULL);
5261 signal(SIGCHLD, SIG_IGN);
5265 /* Save the current store pool point, for resetting at the start of
5266 each message, and save the real sender address, if any. */
5268 reset_point = store_get(0);
5269 real_sender_address = sender_address;
5271 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5272 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5277 store_reset(reset_point);
5280 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5281 input and build the recipients list, before calling receive_msg() to read the
5282 message proper. Whatever sender address is given in the SMTP transaction is
5283 often ignored for local senders - we use the actual sender, which is normally
5284 either the underlying user running this process or a -f argument provided by
5285 a trusted caller. It is saved in real_sender_address. The test for whether to
5286 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5291 if ((rc = smtp_setup_msg()) > 0)
5293 if (real_sender_address != NULL &&
5294 !receive_check_set_sender(sender_address))
5296 sender_address = raw_sender = real_sender_address;
5297 sender_address_unrewritten = NULL;
5300 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5301 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5302 the very end. The result of the ACL is ignored (as for other non-SMTP
5303 messages). It is run for its potential side effects. */
5305 if (smtp_batched_input && acl_not_smtp_start != NULL)
5307 uschar *user_msg, *log_msg;
5308 enable_dollar_recipients = TRUE;
5309 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5310 &user_msg, &log_msg);
5311 enable_dollar_recipients = FALSE;
5314 /* Now get the data for the message */
5316 more = receive_msg(extract_recipients);
5317 if (message_id[0] == 0)
5320 smtp_log_no_mail(); /* Log no mail if configured */
5321 exim_exit(EXIT_FAILURE);
5326 smtp_log_no_mail(); /* Log no mail if configured */
5327 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5331 /* In the non-SMTP case, we have all the information from the command
5332 line, but must process it in case it is in the more general RFC822
5333 format, and in any case, to detect syntax errors. Also, it appears that
5334 the use of comma-separated lists as single arguments is common, so we
5335 had better support them. */
5341 int count = argc - recipients_arg;
5342 uschar **list = argv + recipients_arg;
5344 /* These options cannot be changed dynamically for non-SMTP messages */
5346 active_local_sender_retain = local_sender_retain;
5347 active_local_from_check = local_from_check;
5349 /* Save before any rewriting */
5351 raw_sender = string_copy(sender_address);
5353 /* Loop for each argument */
5355 for (i = 0; i < count; i++)
5357 int start, end, domain;
5359 uschar *s = list[i];
5361 /* Loop for each comma-separated address */
5365 BOOL finished = FALSE;
5367 uschar *ss = parse_find_address_end(s, FALSE);
5369 if (*ss == ',') *ss = 0; else finished = TRUE;
5371 /* Check max recipients - if -t was used, these aren't recipients */
5373 if (recipients_max > 0 && ++rcount > recipients_max &&
5374 !extract_recipients)
5375 if (error_handling == ERRORS_STDERR)
5377 fprintf(stderr, "exim: too many recipients\n");
5378 exim_exit(EXIT_FAILURE);
5383 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5384 errors_sender_rc : EXIT_FAILURE;
5387 #ifdef EXPERIMENTAL_INTERNATIONAL
5389 BOOL b = allow_utf8_domains;
5390 allow_utf8_domains = TRUE;
5393 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5395 #ifdef EXPERIMENTAL_INTERNATIONAL
5396 if (string_is_utf8(recipient))
5397 message_smtputf8 = TRUE;
5399 allow_utf8_domains = b;
5402 if (domain == 0 && !allow_unqualified_recipient)
5405 errmess = US"unqualified recipient address not allowed";
5408 if (recipient == NULL)
5410 if (error_handling == ERRORS_STDERR)
5412 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5413 string_printing(list[i]), errmess);
5414 exim_exit(EXIT_FAILURE);
5420 eblock.text1 = string_printing(list[i]);
5421 eblock.text2 = errmess;
5423 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5424 errors_sender_rc : EXIT_FAILURE;
5428 receive_add_recipient(recipient, -1);
5431 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5435 /* Show the recipients when debugging */
5440 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5441 if (recipients_list != NULL)
5443 debug_printf("Recipients:\n");
5444 for (i = 0; i < recipients_count; i++)
5445 debug_printf(" %s\n", recipients_list[i].address);
5449 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5450 ignored; rejecting here would just add complication, and it can just as
5451 well be done later. Allow $recipients to be visible in the ACL. */
5453 if (acl_not_smtp_start != NULL)
5455 uschar *user_msg, *log_msg;
5456 enable_dollar_recipients = TRUE;
5457 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5458 &user_msg, &log_msg);
5459 enable_dollar_recipients = FALSE;
5462 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5463 will just read the headers for the message, and not write anything onto the
5466 message_ended = END_NOTENDED;
5467 more = receive_msg(extract_recipients);
5469 /* more is always FALSE here (not SMTP message) when reading a message
5470 for real; when reading the headers of a message for filter testing,
5471 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5473 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5474 } /* Non-SMTP message reception */
5476 /* If this is a filter testing run, there are headers in store, but
5477 no message on the spool. Run the filtering code in testing mode, setting
5478 the domain to the qualify domain and the local part to the current user,
5479 unless they have been set by options. The prefix and suffix are left unset
5480 unless specified. The the return path is set to to the sender unless it has
5481 already been set from a return-path header in the message. */
5483 if (filter_test != FTEST_NONE)
5485 deliver_domain = (ftest_domain != NULL)?
5486 ftest_domain : qualify_domain_recipient;
5487 deliver_domain_orig = deliver_domain;
5488 deliver_localpart = (ftest_localpart != NULL)?
5489 ftest_localpart : originator_login;
5490 deliver_localpart_orig = deliver_localpart;
5491 deliver_localpart_prefix = ftest_prefix;
5492 deliver_localpart_suffix = ftest_suffix;
5493 deliver_home = originator_home;
5495 if (return_path == NULL)
5497 printf("Return-path copied from sender\n");
5498 return_path = string_copy(sender_address);
5501 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5502 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5504 receive_add_recipient(
5505 string_sprintf("%s%s%s@%s",
5506 (ftest_prefix == NULL)? US"" : ftest_prefix,
5508 (ftest_suffix == NULL)? US"" : ftest_suffix,
5509 deliver_domain), -1);
5511 printf("Recipient = %s\n", recipients_list[0].address);
5512 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5513 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5515 if (chdir("/")) /* Get away from wherever the user is running this from */
5517 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5518 exim_exit(EXIT_FAILURE);
5521 /* Now we run either a system filter test, or a user filter test, or both.
5522 In the latter case, headers added by the system filter will persist and be
5523 available to the user filter. We need to copy the filter variables
5526 if ((filter_test & FTEST_SYSTEM) != 0)
5528 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5529 exim_exit(EXIT_FAILURE);
5532 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5534 if ((filter_test & FTEST_USER) != 0)
5536 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5537 exim_exit(EXIT_FAILURE);
5540 exim_exit(EXIT_SUCCESS);
5543 /* Else act on the result of message reception. We should not get here unless
5544 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5545 will be TRUE. If it is not, check on the number of messages received in this
5548 if (!session_local_queue_only &&
5549 smtp_accept_queue_per_connection > 0 &&
5550 receive_messagecount > smtp_accept_queue_per_connection)
5552 session_local_queue_only = TRUE;
5553 queue_only_reason = 2;
5556 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5557 and queue_only_load is set, check that the load average is below it. If it is
5558 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5559 default), we put the whole session into queue_only mode. It then remains this
5560 way for any subsequent messages on the same SMTP connection. This is a
5561 deliberate choice; even though the load average may fall, it doesn't seem
5562 right to deliver later messages on the same call when not delivering earlier
5563 ones. However, there are odd cases where this is not wanted, so this can be
5564 changed by setting queue_only_load_latch false. */
5566 local_queue_only = session_local_queue_only;
5567 if (!local_queue_only && queue_only_load >= 0)
5569 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5570 if (local_queue_only)
5572 queue_only_reason = 3;
5573 if (queue_only_load_latch) session_local_queue_only = TRUE;
5577 /* If running as an MUA wrapper, all queueing options and freezing options
5581 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5583 /* Log the queueing here, when it will get a message id attached, but
5584 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5587 if (local_queue_only) switch(queue_only_reason)
5590 log_write(L_delay_delivery,
5591 LOG_MAIN, "no immediate delivery: more than %d messages "
5592 "received in one connection", smtp_accept_queue_per_connection);
5596 log_write(L_delay_delivery,
5597 LOG_MAIN, "no immediate delivery: load average %.2f",
5598 (double)load_average/1000.0);
5602 /* Else do the delivery unless the ACL or local_scan() called for queue only
5603 or froze the message. Always deliver in a separate process. A fork failure is
5604 not a disaster, as the delivery will eventually happen on a subsequent queue
5605 run. The search cache must be tidied before the fork, as the parent will
5606 do it before exiting. The child will trigger a lookup failure and
5607 thereby defer the delivery if it tries to use (for example) a cached ldap
5608 connection that the parent has called unbind on. */
5610 else if (!queue_only_policy && !deliver_freeze)
5615 if ((pid = fork()) == 0)
5618 close_unwanted(); /* Close unwanted file descriptors and TLS */
5619 exim_nullstd(); /* Ensure std{in,out,err} exist */
5621 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5622 mode, deliver_drop_privilege is forced TRUE). */
5624 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5626 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5628 /* Control does not return here. */
5631 /* No need to re-exec */
5633 rc = deliver_message(message_id, FALSE, FALSE);
5635 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5636 EXIT_SUCCESS : EXIT_FAILURE);
5641 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5642 "process: %s", strerror(errno));
5645 /* In the parent, wait if synchronous delivery is required. This will
5646 always be the case in MUA wrapper mode. */
5648 else if (synchronous_delivery)
5651 while (wait(&status) != pid);
5652 if ((status & 0x00ff) != 0)
5653 log_write(0, LOG_MAIN|LOG_PANIC,
5654 "process %d crashed with signal %d while delivering %s",
5655 (int)pid, status & 0x00ff, message_id);
5656 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5660 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5661 automatically reaps children (see comments above the loop), clear away any
5662 finished subprocesses here, in case there are lots of messages coming in
5663 from the same source. */
5665 #ifndef SIG_IGN_WORKS
5666 while (waitpid(-1, NULL, WNOHANG) > 0);
5670 exim_exit(EXIT_SUCCESS); /* Never returns */
5671 return 0; /* To stop compiler warning */