1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
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");
945 fprintf(f, "Routers:");
947 fprintf(f, " accept");
949 #ifdef ROUTER_DNSLOOKUP
950 fprintf(f, " dnslookup");
952 #ifdef ROUTER_IPLITERAL
953 fprintf(f, " ipliteral");
955 #ifdef ROUTER_IPLOOKUP
956 fprintf(f, " iplookup");
958 #ifdef ROUTER_MANUALROUTE
959 fprintf(f, " manualroute");
961 #ifdef ROUTER_QUERYPROGRAM
962 fprintf(f, " queryprogram");
964 #ifdef ROUTER_REDIRECT
965 fprintf(f, " redirect");
969 fprintf(f, "Transports:");
970 #ifdef TRANSPORT_APPENDFILE
971 fprintf(f, " appendfile");
972 #ifdef SUPPORT_MAILDIR
973 fprintf(f, "/maildir");
975 #ifdef SUPPORT_MAILSTORE
976 fprintf(f, "/mailstore");
982 #ifdef TRANSPORT_AUTOREPLY
983 fprintf(f, " autoreply");
985 #ifdef TRANSPORT_LMTP
988 #ifdef TRANSPORT_PIPE
991 #ifdef TRANSPORT_SMTP
996 if (fixed_never_users[0] > 0)
999 fprintf(f, "Fixed never_users: ");
1000 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1001 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1002 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1005 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1007 /* Everything else is details which are only worth reporting when debugging.
1008 Perhaps the tls_version_report should move into this too. */
1013 /* clang defines __GNUC__ (at least, for me) so test for it first */
1014 #if defined(__clang__)
1015 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1016 #elif defined(__GNUC__)
1017 fprintf(f, "Compiler: GCC [%s]\n",
1021 "? unknown version ?"
1025 fprintf(f, "Compiler: <unknown>\n");
1029 tls_version_report(f);
1031 #ifdef EXPERIMENTAL_INTERNATIONAL
1032 utf8_version_report(f);
1035 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1036 if (authi->version_report)
1037 (*authi->version_report)(f);
1039 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1040 characters; unless it's an ancient version of PCRE in which case it
1042 #ifndef PCRE_PRERELEASE
1043 #define PCRE_PRERELEASE
1046 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1047 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1049 PCRE_MAJOR, PCRE_MINOR,
1050 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1053 #undef EXPAND_AND_QUOTE
1056 for (i = 0; i < lookup_list_count; i++)
1057 if (lookup_list[i]->version_report)
1058 lookup_list[i]->version_report(f);
1060 #ifdef WHITELIST_D_MACROS
1061 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1063 fprintf(f, "WHITELIST_D_MACROS unset\n");
1065 #ifdef TRUSTED_CONFIG_LIST
1066 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1068 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1075 /*************************************************
1076 * Show auxiliary information about Exim *
1077 *************************************************/
1080 show_exim_information(enum commandline_info request, FILE *stream)
1087 fprintf(stream, "Oops, something went wrong.\n");
1091 "The -bI: flag takes a string indicating which information to provide.\n"
1092 "If the string is not recognised, you'll get this help (on stderr).\n"
1094 " exim -bI:help this information\n"
1095 " exim -bI:dscp dscp value keywords known\n"
1096 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1100 for (pp = exim_sieve_extension_list; *pp; ++pp)
1101 fprintf(stream, "%s\n", *pp);
1104 dscp_list_to_stream(stream);
1110 /*************************************************
1111 * Quote a local part *
1112 *************************************************/
1114 /* This function is used when a sender address or a From: or Sender: header
1115 line is being created from the caller's login, or from an authenticated_id. It
1116 applies appropriate quoting rules for a local part.
1118 Argument: the local part
1119 Returns: the local part, quoted if necessary
1123 local_part_quote(uschar *lpart)
1125 BOOL needs_quote = FALSE;
1130 for (t = lpart; !needs_quote && *t != 0; t++)
1132 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1133 (*t != '.' || t == lpart || t[1] == 0);
1136 if (!needs_quote) return lpart;
1139 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1143 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1146 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1149 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1150 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1151 yield = string_cat(yield, &size, &ptr, nq, 1);
1155 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1163 /*************************************************
1164 * Load readline() functions *
1165 *************************************************/
1167 /* This function is called from testing executions that read data from stdin,
1168 but only when running as the calling user. Currently, only -be does this. The
1169 function loads the readline() function library and passes back the functions.
1170 On some systems, it needs the curses library, so load that too, but try without
1171 it if loading fails. All this functionality has to be requested at build time.
1174 fn_readline_ptr pointer to where to put the readline pointer
1175 fn_addhist_ptr pointer to where to put the addhistory function
1177 Returns: the dlopen handle or NULL on failure
1181 set_readline(char * (**fn_readline_ptr)(const char *),
1182 void (**fn_addhist_ptr)(const char *))
1185 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1187 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1188 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1190 if (dlhandle != NULL)
1192 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1193 * char * readline (const char *prompt);
1194 * void add_history (const char *string);
1196 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1197 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1201 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1210 /*************************************************
1211 * Get a line from stdin for testing things *
1212 *************************************************/
1214 /* This function is called when running tests that can take a number of lines
1215 of input (for example, -be and -bt). It handles continuations and trailing
1216 spaces. And prompting and a blank line output on eof. If readline() is in use,
1217 the arguments are non-NULL and provide the relevant functions.
1220 fn_readline readline function or NULL
1221 fn_addhist addhist function or NULL
1223 Returns: pointer to dynamic memory, or NULL at end of file
1227 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1232 uschar *yield = NULL;
1234 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1238 uschar buffer[1024];
1242 char *readline_line = NULL;
1243 if (fn_readline != NULL)
1245 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1246 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1247 p = US readline_line;
1252 /* readline() not in use */
1255 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1259 /* Handle the line */
1261 ss = p + (int)Ustrlen(p);
1262 while (ss > p && isspace(ss[-1])) ss--;
1266 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1269 yield = string_cat(yield, &size, &ptr, p, ss - p);
1272 if (fn_readline != NULL) free(readline_line);
1275 if (ss == p || yield[ptr-1] != '\\')
1283 if (yield == NULL) printf("\n");
1289 /*************************************************
1290 * Output usage information for the program *
1291 *************************************************/
1293 /* This function is called when there are no recipients
1294 or a specific --help argument was added.
1297 progname information on what name we were called by
1299 Returns: DOES NOT RETURN
1303 exim_usage(uschar *progname)
1306 /* Handle specific program invocation varients */
1307 if (Ustrcmp(progname, US"-mailq") == 0)
1310 "mailq - list the contents of the mail queue\n\n"
1311 "For a list of options, see the Exim documentation.\n");
1315 /* Generic usage - we output this whatever happens */
1317 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1318 "not directly from a shell command line. Options and/or arguments control\n"
1319 "what it does when called. For a list of options, see the Exim documentation.\n");
1326 /*************************************************
1327 * Validate that the macros given are okay *
1328 *************************************************/
1330 /* Typically, Exim will drop privileges if macros are supplied. In some
1331 cases, we want to not do so.
1333 Arguments: none (macros is a global)
1334 Returns: true if trusted, false otherwise
1338 macros_trusted(void)
1340 #ifdef WHITELIST_D_MACROS
1342 uschar *whitelisted, *end, *p, **whites, **w;
1343 int white_count, i, n;
1345 BOOL prev_char_item, found;
1350 #ifndef WHITELIST_D_MACROS
1354 /* We only trust -D overrides for some invoking users:
1355 root, the exim run-time user, the optional config owner user.
1356 I don't know why config-owner would be needed, but since they can own the
1357 config files anyway, there's no security risk to letting them override -D. */
1358 if ( ! ((real_uid == root_uid)
1359 || (real_uid == exim_uid)
1360 #ifdef CONFIGURE_OWNER
1361 || (real_uid == config_uid)
1365 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1369 /* Get a list of macros which are whitelisted */
1370 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1371 prev_char_item = FALSE;
1373 for (p = whitelisted; *p != '\0'; ++p)
1375 if (*p == ':' || isspace(*p))
1380 prev_char_item = FALSE;
1383 if (!prev_char_item)
1384 prev_char_item = TRUE;
1391 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1392 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1397 if (i == white_count)
1399 while (*p != '\0' && p < end)
1405 /* The list of macros should be very short. Accept the N*M complexity. */
1406 for (m = macros; m != NULL; m = m->next)
1409 for (w = whites; *w; ++w)
1410 if (Ustrcmp(*w, m->name) == 0)
1417 if (m->replacement == NULL)
1419 len = Ustrlen(m->replacement);
1422 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1423 0, PCRE_EOPT, NULL, 0);
1426 if (n != PCRE_ERROR_NOMATCH)
1427 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1431 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1437 /*************************************************
1438 * Entry point and high-level code *
1439 *************************************************/
1441 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1442 the appropriate action. All the necessary functions are present in the one
1443 binary. I originally thought one should split it up, but it turns out that so
1444 much of the apparatus is needed in each chunk that one might as well just have
1445 it all available all the time, which then makes the coding easier as well.
1448 argc count of entries in argv
1449 argv argument strings, with argv[0] being the program name
1451 Returns: EXIT_SUCCESS if terminated successfully
1452 EXIT_FAILURE otherwise, except when a message has been sent
1453 to the sender, and -oee was given
1457 main(int argc, char **cargv)
1459 uschar **argv = USS cargv;
1460 int arg_receive_timeout = -1;
1461 int arg_smtp_receive_timeout = -1;
1462 int arg_error_handling = error_handling;
1463 int filter_sfd = -1;
1464 int filter_ufd = -1;
1467 int list_queue_option = 0;
1469 int msg_action_arg = -1;
1470 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1471 int queue_only_reason = 0;
1473 int perl_start_option = 0;
1475 int recipients_arg = argc;
1476 int sender_address_domain = 0;
1477 int test_retry_arg = -1;
1478 int test_rewrite_arg = -1;
1479 BOOL arg_queue_only = FALSE;
1480 BOOL bi_option = FALSE;
1481 BOOL checking = FALSE;
1482 BOOL count_queue = FALSE;
1483 BOOL expansion_test = FALSE;
1484 BOOL extract_recipients = FALSE;
1485 BOOL flag_G = FALSE;
1486 BOOL flag_n = FALSE;
1487 BOOL forced_delivery = FALSE;
1488 BOOL f_end_dot = FALSE;
1489 BOOL deliver_give_up = FALSE;
1490 BOOL list_queue = FALSE;
1491 BOOL list_options = FALSE;
1492 BOOL local_queue_only;
1494 BOOL one_msg_action = FALSE;
1495 BOOL queue_only_set = FALSE;
1496 BOOL receiving_message = TRUE;
1497 BOOL sender_ident_set = FALSE;
1498 BOOL session_local_queue_only;
1500 BOOL removed_privilege = FALSE;
1501 BOOL usage_wanted = FALSE;
1502 BOOL verify_address_mode = FALSE;
1503 BOOL verify_as_sender = FALSE;
1504 BOOL version_printed = FALSE;
1505 uschar *alias_arg = NULL;
1506 uschar *called_as = US"";
1507 uschar *cmdline_syslog_name = NULL;
1508 uschar *start_queue_run_id = NULL;
1509 uschar *stop_queue_run_id = NULL;
1510 uschar *expansion_test_message = NULL;
1511 uschar *ftest_domain = NULL;
1512 uschar *ftest_localpart = NULL;
1513 uschar *ftest_prefix = NULL;
1514 uschar *ftest_suffix = NULL;
1515 uschar *log_oneline = NULL;
1516 uschar *malware_test_file = NULL;
1517 uschar *real_sender_address;
1518 uschar *originator_home = US"/";
1523 struct stat statbuf;
1524 pid_t passed_qr_pid = (pid_t)0;
1525 int passed_qr_pipe = -1;
1526 gid_t group_list[NGROUPS_MAX];
1528 /* For the -bI: flag */
1529 enum commandline_info info_flag = CMDINFO_NONE;
1530 BOOL info_stdout = FALSE;
1532 /* Possible options for -R and -S */
1534 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1536 /* Need to define this in case we need to change the environment in order
1537 to get rid of a bogus time zone. We have to make it char rather than uschar
1538 because some OS define it in /usr/include/unistd.h. */
1540 extern char **environ;
1542 /* If the Exim user and/or group and/or the configuration file owner/group were
1543 defined by ref:name at build time, we must now find the actual uid/gid values.
1544 This is a feature to make the lives of binary distributors easier. */
1546 #ifdef EXIM_USERNAME
1547 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1551 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1555 /* If ref:name uses a number as the name, route_finduser() returns
1556 TRUE with exim_uid set and pw coerced to NULL. */
1558 exim_gid = pw->pw_gid;
1559 #ifndef EXIM_GROUPNAME
1563 "exim: ref:name should specify a usercode, not a group.\n"
1564 "exim: can't let you get away with it unless you also specify a group.\n");
1571 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1577 #ifdef EXIM_GROUPNAME
1578 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1580 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1586 #ifdef CONFIGURE_OWNERNAME
1587 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1589 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1590 CONFIGURE_OWNERNAME);
1595 /* We default the system_filter_user to be the Exim run-time user, as a
1596 sane non-root value. */
1597 system_filter_uid = exim_uid;
1599 #ifdef CONFIGURE_GROUPNAME
1600 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1602 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1603 CONFIGURE_GROUPNAME);
1608 /* In the Cygwin environment, some initialization needs doing. It is fudged
1609 in by means of this macro. */
1615 /* Check a field which is patched when we are running Exim within its
1616 testing harness; do a fast initial check, and then the whole thing. */
1618 running_in_test_harness =
1619 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1621 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1622 at the start of a program; however, it seems that some environments do not
1623 follow this. A "strange" locale can affect the formatting of timestamps, so we
1626 setlocale(LC_ALL, "C");
1628 /* Set up the default handler for timing using alarm(). */
1630 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1632 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1633 because store_malloc writes a log entry on failure. */
1635 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1636 if (log_buffer == NULL)
1638 fprintf(stderr, "exim: failed to get store for log buffer\n");
1642 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1643 NULL when the daemon is run and the file is closed. We have to use this
1644 indirection, because some systems don't allow writing to the variable "stderr".
1647 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1649 /* Arrange for the PCRE regex library to use our store functions. Note that
1650 the normal calls are actually macros that add additional arguments for
1651 debugging purposes so we have to assign specially constructed functions here.
1652 The default is to use store in the stacking pool, but this is overridden in the
1653 regex_must_compile() function. */
1655 pcre_malloc = function_store_get;
1656 pcre_free = function_dummy_free;
1658 /* Ensure there is a big buffer for temporary use in several places. It is put
1659 in malloc store so that it can be freed for enlargement if necessary. */
1661 big_buffer = store_malloc(big_buffer_size);
1663 /* Set up the handler for the data request signal, and set the initial
1664 descriptive text. */
1666 set_process_info("initializing");
1667 os_restarting_signal(SIGUSR1, usr1_handler);
1669 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1670 in the daemon code. For the rest of Exim's uses, we ignore it. */
1672 signal(SIGHUP, SIG_IGN);
1674 /* We don't want to die on pipe errors as the code is written to handle
1675 the write error instead. */
1677 signal(SIGPIPE, SIG_IGN);
1679 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1680 set to SIG_IGN. This causes subprocesses that complete before the parent
1681 process waits for them not to hang around, so when Exim calls wait(), nothing
1682 is there. The wait() code has been made robust against this, but let's ensure
1683 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1684 ending status. We use sigaction rather than plain signal() on those OS where
1685 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1686 problem on AIX with this.) */
1690 struct sigaction act;
1691 act.sa_handler = SIG_DFL;
1692 sigemptyset(&(act.sa_mask));
1694 sigaction(SIGCHLD, &act, NULL);
1697 signal(SIGCHLD, SIG_DFL);
1700 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1705 /* Set up the version number. Set up the leading 'E' for the external form of
1706 message ids, set the pointer to the internal form, and initialize it to
1707 indicate no message being processed. */
1710 message_id_option[0] = '-';
1711 message_id_external = message_id_option + 1;
1712 message_id_external[0] = 'E';
1713 message_id = message_id_external + 1;
1716 /* Set the umask to zero so that any files Exim creates using open() are
1717 created with the modes that it specifies. NOTE: Files created with fopen() have
1718 a problem, which was not recognized till rather late (February 2006). With this
1719 umask, such files will be world writeable. (They are all content scanning files
1720 in the spool directory, which isn't world-accessible, so this is not a
1721 disaster, but it's untidy.) I don't want to change this overall setting,
1722 however, because it will interact badly with the open() calls. Instead, there's
1723 now a function called modefopen() that fiddles with the umask while calling
1728 /* Precompile the regular expression for matching a message id. Keep this in
1729 step with the code that generates ids in the accept.c module. We need to do
1730 this here, because the -M options check their arguments for syntactic validity
1731 using mac_ismsgid, which uses this. */
1734 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1736 /* Precompile the regular expression that is used for matching an SMTP error
1737 code, possibly extended, at the start of an error message. Note that the
1738 terminating whitespace character is included. */
1741 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1744 #ifdef WHITELIST_D_MACROS
1745 /* Precompile the regular expression used to filter the content of macros
1746 given to -D for permissibility. */
1748 regex_whitelisted_macro =
1749 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1753 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1754 this seems to be a generally accepted convention, since one finds symbolic
1755 links called "mailq" in standard OS configurations. */
1757 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1758 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1761 receiving_message = FALSE;
1762 called_as = US"-mailq";
1765 /* If the program is called as "rmail" treat it as equivalent to
1766 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1767 i.e. preventing a single dot on a line from terminating the message, and
1768 returning with zero return code, even in cases of error (provided an error
1769 message has been sent). */
1771 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1772 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1775 called_as = US"-rmail";
1776 errors_sender_rc = EXIT_SUCCESS;
1779 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1780 this is a smail convention. */
1782 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1783 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1785 smtp_input = smtp_batched_input = TRUE;
1786 called_as = US"-rsmtp";
1789 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1790 this is a smail convention. */
1792 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1793 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1796 receiving_message = FALSE;
1797 called_as = US"-runq";
1800 /* If the program is called as "newaliases" treat it as equivalent to
1801 "exim -bi"; this is a sendmail convention. */
1803 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1804 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1807 receiving_message = FALSE;
1808 called_as = US"-newaliases";
1811 /* Save the original effective uid for a couple of uses later. It should
1812 normally be root, but in some esoteric environments it may not be. */
1814 original_euid = geteuid();
1816 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1817 to be the same as the real ones. This makes a difference only if Exim is setuid
1818 (or setgid) to something other than root, which could be the case in some
1819 special configurations. */
1821 real_uid = getuid();
1822 real_gid = getgid();
1824 if (real_uid == root_uid)
1826 rv = setgid(real_gid);
1829 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1830 (long int)real_gid, strerror(errno));
1833 rv = setuid(real_uid);
1836 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1837 (long int)real_uid, strerror(errno));
1842 /* If neither the original real uid nor the original euid was root, Exim is
1843 running in an unprivileged state. */
1845 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1847 /* Scan the program's arguments. Some can be dealt with right away; others are
1848 simply recorded for checking and handling afterwards. Do a high-level switch
1849 on the second character (the one after '-'), to save some effort. */
1851 for (i = 1; i < argc; i++)
1853 BOOL badarg = FALSE;
1854 uschar *arg = argv[i];
1858 /* An argument not starting with '-' is the start of a recipients list;
1859 break out of the options-scanning loop. */
1867 /* An option consistion of -- terminates the options */
1869 if (Ustrcmp(arg, "--") == 0)
1871 recipients_arg = i + 1;
1875 /* Handle flagged options */
1877 switchchar = arg[1];
1880 /* Make all -ex options synonymous with -oex arguments, since that
1881 is assumed by various callers. Also make -qR options synonymous with -R
1882 options, as that seems to be required as well. Allow for -qqR too, and
1883 the same for -S options. */
1885 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1886 Ustrncmp(arg+1, "qR", 2) == 0 ||
1887 Ustrncmp(arg+1, "qS", 2) == 0)
1889 switchchar = arg[2];
1892 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1894 switchchar = arg[3];
1896 queue_2stage = TRUE;
1899 /* Make -r synonymous with -f, since it is a documented alias */
1901 else if (arg[1] == 'r') switchchar = 'f';
1903 /* Make -ov synonymous with -v */
1905 else if (Ustrcmp(arg, "-ov") == 0)
1911 /* deal with --option_aliases */
1912 else if (switchchar == '-')
1914 if (Ustrcmp(argrest, "help") == 0)
1916 usage_wanted = TRUE;
1919 else if (Ustrcmp(argrest, "version") == 0)
1926 /* High-level switch on active initial letter */
1931 /* sendmail uses -Ac and -Am to control which .cf file is used;
1934 if (*argrest == '\0') { badarg = TRUE; break; }
1937 BOOL ignore = FALSE;
1942 if (*(argrest + 1) == '\0')
1946 if (!ignore) { badarg = TRUE; break; }
1950 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1951 so has no need of it. */
1954 if (*argrest == 0) i++; /* Skip over the type */
1959 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1961 /* -bd: Run in daemon mode, awaiting SMTP connections.
1962 -bdf: Ditto, but in the foreground.
1965 if (*argrest == 'd')
1967 daemon_listen = TRUE;
1968 if (*(++argrest) == 'f') background_daemon = FALSE;
1969 else if (*argrest != 0) { badarg = TRUE; break; }
1972 /* -be: Run in expansion test mode
1973 -bem: Ditto, but read a message from a file first
1976 else if (*argrest == 'e')
1978 expansion_test = checking = TRUE;
1979 if (argrest[1] == 'm')
1981 if (++i >= argc) { badarg = TRUE; break; }
1982 expansion_test_message = argv[i];
1985 if (argrest[1] != 0) { badarg = TRUE; break; }
1988 /* -bF: Run system filter test */
1990 else if (*argrest == 'F')
1992 filter_test |= FTEST_SYSTEM;
1993 if (*(++argrest) != 0) { badarg = TRUE; break; }
1994 if (++i < argc) filter_test_sfile = argv[i]; else
1996 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2001 /* -bf: Run user filter test
2002 -bfd: Set domain for filter testing
2003 -bfl: Set local part for filter testing
2004 -bfp: Set prefix for filter testing
2005 -bfs: Set suffix for filter testing
2008 else if (*argrest == 'f')
2010 if (*(++argrest) == 0)
2012 filter_test |= FTEST_USER;
2013 if (++i < argc) filter_test_ufile = argv[i]; else
2015 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2023 fprintf(stderr, "exim: string expected after %s\n", arg);
2026 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2027 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2028 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2029 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2030 else { badarg = TRUE; break; }
2034 /* -bh: Host checking - an IP address must follow. */
2036 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2038 if (++i >= argc) { badarg = TRUE; break; }
2039 sender_host_address = argv[i];
2040 host_checking = checking = log_testing_mode = TRUE;
2041 host_checking_callout = argrest[1] == 'c';
2044 /* -bi: This option is used by sendmail to initialize *the* alias file,
2045 though it has the -oA option to specify a different file. Exim has no
2046 concept of *the* alias file, but since Sun's YP make script calls
2047 sendmail this way, some support must be provided. */
2049 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2051 /* -bI: provide information, of the type to follow after a colon.
2052 This is an Exim flag. */
2054 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2056 uschar *p = &argrest[2];
2057 info_flag = CMDINFO_HELP;
2060 if (strcmpic(p, CUS"sieve") == 0)
2062 info_flag = CMDINFO_SIEVE;
2065 else if (strcmpic(p, CUS"dscp") == 0)
2067 info_flag = CMDINFO_DSCP;
2070 else if (strcmpic(p, CUS"help") == 0)
2077 /* -bm: Accept and deliver message - the default option. Reinstate
2078 receiving_message, which got turned off for all -b options. */
2080 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2082 /* -bmalware: test the filename given for malware */
2084 else if (Ustrcmp(argrest, "malware") == 0)
2086 if (++i >= argc) { badarg = TRUE; break; }
2087 malware_test_file = argv[i];
2090 /* -bnq: For locally originating messages, do not qualify unqualified
2091 addresses. In the envelope, this causes errors; in header lines they
2094 else if (Ustrcmp(argrest, "nq") == 0)
2096 allow_unqualified_sender = FALSE;
2097 allow_unqualified_recipient = FALSE;
2100 /* -bpxx: List the contents of the mail queue, in various forms. If
2101 the option is -bpc, just a queue count is needed. Otherwise, if the
2102 first letter after p is r, then order is random. */
2104 else if (*argrest == 'p')
2106 if (*(++argrest) == 'c')
2109 if (*(++argrest) != 0) badarg = TRUE;
2113 if (*argrest == 'r')
2115 list_queue_option = 8;
2118 else list_queue_option = 0;
2122 /* -bp: List the contents of the mail queue, top-level only */
2124 if (*argrest == 0) {}
2126 /* -bpu: List the contents of the mail queue, top-level undelivered */
2128 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2130 /* -bpa: List the contents of the mail queue, including all delivered */
2132 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2134 /* Unknown after -bp[r] */
2144 /* -bP: List the configuration variables given as the address list.
2145 Force -v, so configuration errors get displayed. */
2147 else if (Ustrcmp(argrest, "P") == 0)
2149 list_options = TRUE;
2150 debug_selector |= D_v;
2151 debug_file = stderr;
2154 /* -brt: Test retry configuration lookup */
2156 else if (Ustrcmp(argrest, "rt") == 0)
2158 test_retry_arg = i + 1;
2162 /* -brw: Test rewrite configuration */
2164 else if (Ustrcmp(argrest, "rw") == 0)
2166 test_rewrite_arg = i + 1;
2170 /* -bS: Read SMTP commands on standard input, but produce no replies -
2171 all errors are reported by sending messages. */
2173 else if (Ustrcmp(argrest, "S") == 0)
2174 smtp_input = smtp_batched_input = receiving_message = TRUE;
2176 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2177 on standard output. */
2179 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2181 /* -bt: address testing mode */
2183 else if (Ustrcmp(argrest, "t") == 0)
2184 address_test_mode = checking = log_testing_mode = TRUE;
2186 /* -bv: verify addresses */
2188 else if (Ustrcmp(argrest, "v") == 0)
2189 verify_address_mode = checking = log_testing_mode = TRUE;
2191 /* -bvs: verify sender addresses */
2193 else if (Ustrcmp(argrest, "vs") == 0)
2195 verify_address_mode = checking = log_testing_mode = TRUE;
2196 verify_as_sender = TRUE;
2199 /* -bV: Print version string and support details */
2201 else if (Ustrcmp(argrest, "V") == 0)
2203 printf("Exim version %s #%s built %s\n", version_string,
2204 version_cnumber, version_date);
2205 printf("%s\n", CS version_copyright);
2206 version_printed = TRUE;
2207 show_whats_supported(stdout);
2210 /* -bw: inetd wait mode, accept a listening socket as stdin */
2212 else if (*argrest == 'w')
2214 inetd_wait_mode = TRUE;
2215 background_daemon = FALSE;
2216 daemon_listen = TRUE;
2217 if (*(++argrest) != '\0')
2219 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2220 if (inetd_wait_timeout <= 0)
2222 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2232 /* -C: change configuration file list; ignore if it isn't really
2233 a change! Enforce a prefix check if required. */
2238 if(++i < argc) argrest = argv[i]; else
2239 { badarg = TRUE; break; }
2241 if (Ustrcmp(config_main_filelist, argrest) != 0)
2243 #ifdef ALT_CONFIG_PREFIX
2245 int len = Ustrlen(ALT_CONFIG_PREFIX);
2246 uschar *list = argrest;
2248 while((filename = string_nextinlist(&list, &sep, big_buffer,
2249 big_buffer_size)) != NULL)
2251 if ((Ustrlen(filename) < len ||
2252 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2253 Ustrstr(filename, "/../") != NULL) &&
2254 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2256 fprintf(stderr, "-C Permission denied\n");
2261 if (real_uid != root_uid)
2263 #ifdef TRUSTED_CONFIG_LIST
2265 if (real_uid != exim_uid
2266 #ifdef CONFIGURE_OWNER
2267 && real_uid != config_uid
2270 trusted_config = FALSE;
2273 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2276 struct stat statbuf;
2278 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2279 (statbuf.st_uid != root_uid /* owner not root */
2280 #ifdef CONFIGURE_OWNER
2281 && statbuf.st_uid != config_uid /* owner not the special one */
2284 (statbuf.st_gid != root_gid /* group not root */
2285 #ifdef CONFIGURE_GROUP
2286 && statbuf.st_gid != config_gid /* group not the special one */
2288 && (statbuf.st_mode & 020) != 0 /* group writeable */
2290 (statbuf.st_mode & 2) != 0) /* world writeable */
2292 trusted_config = FALSE;
2297 /* Well, the trust list at least is up to scratch... */
2298 void *reset_point = store_get(0);
2299 uschar *trusted_configs[32];
2303 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2305 uschar *start = big_buffer, *nl;
2306 while (*start && isspace(*start))
2310 nl = Ustrchr(start, '\n');
2313 trusted_configs[nr_configs++] = string_copy(start);
2314 if (nr_configs == 32)
2322 const uschar *list = argrest;
2324 while (trusted_config && (filename = string_nextinlist(&list,
2325 &sep, big_buffer, big_buffer_size)) != NULL)
2327 for (i=0; i < nr_configs; i++)
2329 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2332 if (i == nr_configs)
2334 trusted_config = FALSE;
2338 store_reset(reset_point);
2342 /* No valid prefixes found in trust_list file. */
2343 trusted_config = FALSE;
2349 /* Could not open trust_list file. */
2350 trusted_config = FALSE;
2354 /* Not root; don't trust config */
2355 trusted_config = FALSE;
2359 config_main_filelist = argrest;
2360 config_changed = TRUE;
2365 /* -D: set up a macro definition */
2368 #ifdef DISABLE_D_OPTION
2369 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2374 macro_item *mlast = NULL;
2377 uschar *s = argrest;
2379 while (isspace(*s)) s++;
2381 if (*s < 'A' || *s > 'Z')
2383 fprintf(stderr, "exim: macro name set by -D must start with "
2384 "an upper case letter\n");
2388 while (isalnum(*s) || *s == '_')
2390 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2394 if (ptr == 0) { badarg = TRUE; break; }
2395 while (isspace(*s)) s++;
2398 if (*s++ != '=') { badarg = TRUE; break; }
2399 while (isspace(*s)) s++;
2402 for (m = macros; m != NULL; m = m->next)
2404 if (Ustrcmp(m->name, name) == 0)
2406 fprintf(stderr, "exim: duplicated -D in command line\n");
2412 m = store_get(sizeof(macro_item) + Ustrlen(name));
2414 m->command_line = TRUE;
2415 if (mlast == NULL) macros = m; else mlast->next = m;
2416 Ustrcpy(m->name, name);
2417 m->replacement = string_copy(s);
2419 if (clmacro_count >= MAX_CLMACROS)
2421 fprintf(stderr, "exim: too many -D options on command line\n");
2424 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2430 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2431 The latter is now a no-op, retained for compatibility only. If -dd is used,
2432 debugging subprocesses of the daemon is disabled. */
2435 if (Ustrcmp(argrest, "ropcr") == 0)
2437 /* drop_cr = TRUE; */
2440 /* Use an intermediate variable so that we don't set debugging while
2441 decoding the debugging bits. */
2445 unsigned int selector = D_default;
2448 if (*argrest == 'd')
2450 debug_daemon = TRUE;
2454 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2455 debug_options_count, US"debug", 0);
2456 debug_selector = selector;
2461 /* -E: This is a local error message. This option is not intended for
2462 external use at all, but is not restricted to trusted callers because it
2463 does no harm (just suppresses certain error messages) and if Exim is run
2464 not setuid root it won't always be trusted when it generates error
2465 messages using this option. If there is a message id following -E, point
2466 message_reference at it, for logging. */
2469 local_error_message = TRUE;
2470 if (mac_ismsgid(argrest)) message_reference = argrest;
2474 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2475 option, so it looks as if historically the -oex options are also callable
2476 without the leading -o. So we have to accept them. Before the switch,
2477 anything starting -oe has been converted to -e. Exim does not support all
2478 of the sendmail error options. */
2481 if (Ustrcmp(argrest, "e") == 0)
2483 arg_error_handling = ERRORS_SENDER;
2484 errors_sender_rc = EXIT_SUCCESS;
2486 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2487 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2488 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2489 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2494 /* -F: Set sender's full name, used instead of the gecos entry from
2495 the password file. Since users can usually alter their gecos entries,
2496 there's no security involved in using this instead. The data can follow
2497 the -F or be in the next argument. */
2502 if(++i < argc) argrest = argv[i]; else
2503 { badarg = TRUE; break; }
2505 originator_name = argrest;
2506 sender_name_forced = TRUE;
2510 /* -f: Set sender's address - this value is only actually used if Exim is
2511 run by a trusted user, or if untrusted_set_sender is set and matches the
2512 address, except that the null address can always be set by any user. The
2513 test for this happens later, when the value given here is ignored when not
2514 permitted. For an untrusted user, the actual sender is still put in Sender:
2515 if it doesn't match the From: header (unless no_local_from_check is set).
2516 The data can follow the -f or be in the next argument. The -r switch is an
2517 obsolete form of -f but since there appear to be programs out there that
2518 use anything that sendmail has ever supported, better accept it - the
2519 synonymizing is done before the switch above.
2521 At this stage, we must allow domain literal addresses, because we don't
2522 know what the setting of allow_domain_literals is yet. Ditto for trailing
2523 dots and strip_trailing_dot. */
2527 int dummy_start, dummy_end;
2531 if (i+1 < argc) argrest = argv[++i]; else
2532 { badarg = TRUE; break; }
2535 sender_address = string_sprintf(""); /* Ensure writeable memory */
2538 uschar *temp = argrest + Ustrlen(argrest) - 1;
2539 while (temp >= argrest && isspace(*temp)) temp--;
2540 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2541 allow_domain_literals = TRUE;
2542 strip_trailing_dot = TRUE;
2543 #ifdef EXPERIMENTAL_INTERNATIONAL
2544 allow_utf8_domains = TRUE;
2546 sender_address = parse_extract_address(argrest, &errmess,
2547 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2548 #ifdef EXPERIMENTAL_INTERNATIONAL
2549 message_smtputf8 = string_is_utf8(sender_address);
2550 allow_utf8_domains = FALSE;
2552 allow_domain_literals = FALSE;
2553 strip_trailing_dot = FALSE;
2554 if (sender_address == NULL)
2556 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2557 return EXIT_FAILURE;
2560 sender_address_forced = TRUE;
2564 /* -G: sendmail invocation to specify that it's a gateway submission and
2565 sendmail may complain about problems instead of fixing them.
2566 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2567 not at this time complain about problems. */
2573 /* -h: Set the hop count for an incoming message. Exim does not currently
2574 support this; it always computes it by counting the Received: headers.
2575 To put it in will require a change to the spool header file format. */
2580 if(++i < argc) argrest = argv[i]; else
2581 { badarg = TRUE; break; }
2583 if (!isdigit(*argrest)) badarg = TRUE;
2587 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2588 not to be documented for sendmail but mailx (at least) uses it) */
2591 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2595 /* -L: set the identifier used for syslog; equivalent to setting
2596 syslog_processname in the config file, but needs to be an admin option. */
2599 if (*argrest == '\0')
2601 if(++i < argc) argrest = argv[i]; else
2602 { badarg = TRUE; break; }
2604 sz = Ustrlen(argrest);
2607 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2608 return EXIT_FAILURE;
2612 fprintf(stderr, "exim: the -L syslog name is too short\n");
2613 return EXIT_FAILURE;
2615 cmdline_syslog_name = argrest;
2619 receiving_message = FALSE;
2621 /* -MC: continue delivery of another message via an existing open
2622 file descriptor. This option is used for an internal call by the
2623 smtp transport when there is a pending message waiting to go to an
2624 address to which it has got a connection. Five subsequent arguments are
2625 required: transport name, host name, IP address, sequence number, and
2626 message_id. Transports may decline to create new processes if the sequence
2627 number gets too big. The channel is stdin. This (-MC) must be the last
2628 argument. There's a subsequent check that the real-uid is privileged.
2630 If we are running in the test harness. delay for a bit, to let the process
2631 that set this one up complete. This makes for repeatability of the logging,
2634 if (Ustrcmp(argrest, "C") == 0)
2636 union sockaddr_46 interface_sock;
2637 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2641 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2642 return EXIT_FAILURE;
2645 if (msg_action_arg >= 0)
2647 fprintf(stderr, "exim: incompatible arguments\n");
2648 return EXIT_FAILURE;
2651 continue_transport = argv[++i];
2652 continue_hostname = argv[++i];
2653 continue_host_address = argv[++i];
2654 continue_sequence = Uatoi(argv[++i]);
2655 msg_action = MSG_DELIVER;
2656 msg_action_arg = ++i;
2657 forced_delivery = TRUE;
2658 queue_run_pid = passed_qr_pid;
2659 queue_run_pipe = passed_qr_pipe;
2661 if (!mac_ismsgid(argv[i]))
2663 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2665 return EXIT_FAILURE;
2668 /* Set up $sending_ip_address and $sending_port */
2670 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2672 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2676 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2678 return EXIT_FAILURE;
2681 if (running_in_test_harness) millisleep(500);
2685 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2686 precedes -MC (see above). The flag indicates that the host to which
2687 Exim is connected has accepted an AUTH sequence. */
2689 else if (Ustrcmp(argrest, "CA") == 0)
2691 smtp_authenticated = TRUE;
2695 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2696 that exim is connected to supports the esmtp extension DSN */
2697 else if (Ustrcmp(argrest, "CD") == 0)
2699 smtp_use_dsn = TRUE;
2703 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2704 it preceded -MC (see above) */
2706 else if (Ustrcmp(argrest, "CP") == 0)
2708 smtp_use_pipelining = TRUE;
2712 /* -MCQ: pass on the pid of the queue-running process that started
2713 this chain of deliveries and the fd of its synchronizing pipe; this
2714 is useful only when it precedes -MC (see above) */
2716 else if (Ustrcmp(argrest, "CQ") == 0)
2718 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2720 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2725 /* -MCS: set the smtp_use_size flag; this is useful only when it
2726 precedes -MC (see above) */
2728 else if (Ustrcmp(argrest, "CS") == 0)
2730 smtp_use_size = TRUE;
2734 /* -MCT: set the tls_offered flag; this is useful only when it
2735 precedes -MC (see above). The flag indicates that the host to which
2736 Exim is connected has offered TLS support. */
2739 else if (Ustrcmp(argrest, "CT") == 0)
2746 /* -M[x]: various operations on the following list of message ids:
2747 -M deliver the messages, ignoring next retry times and thawing
2748 -Mc deliver the messages, checking next retry times, no thawing
2749 -Mf freeze the messages
2750 -Mg give up on the messages
2751 -Mt thaw the messages
2752 -Mrm remove the messages
2753 In the above cases, this must be the last option. There are also the
2754 following options which are followed by a single message id, and which
2755 act on that message. Some of them use the "recipient" addresses as well.
2756 -Mar add recipient(s)
2757 -Mmad mark all recipients delivered
2758 -Mmd mark recipients(s) delivered
2760 -Mset load a message for use with -be
2762 -Mvc show copy (of whole message, in RFC 2822 format)
2767 else if (*argrest == 0)
2769 msg_action = MSG_DELIVER;
2770 forced_delivery = deliver_force_thaw = TRUE;
2772 else if (Ustrcmp(argrest, "ar") == 0)
2774 msg_action = MSG_ADD_RECIPIENT;
2775 one_msg_action = TRUE;
2777 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2778 else if (Ustrcmp(argrest, "es") == 0)
2780 msg_action = MSG_EDIT_SENDER;
2781 one_msg_action = TRUE;
2783 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2784 else if (Ustrcmp(argrest, "g") == 0)
2786 msg_action = MSG_DELIVER;
2787 deliver_give_up = TRUE;
2789 else if (Ustrcmp(argrest, "mad") == 0)
2791 msg_action = MSG_MARK_ALL_DELIVERED;
2793 else if (Ustrcmp(argrest, "md") == 0)
2795 msg_action = MSG_MARK_DELIVERED;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2799 else if (Ustrcmp(argrest, "set") == 0)
2801 msg_action = MSG_LOAD;
2802 one_msg_action = TRUE;
2804 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2805 else if (Ustrcmp(argrest, "vb") == 0)
2807 msg_action = MSG_SHOW_BODY;
2808 one_msg_action = TRUE;
2810 else if (Ustrcmp(argrest, "vc") == 0)
2812 msg_action = MSG_SHOW_COPY;
2813 one_msg_action = TRUE;
2815 else if (Ustrcmp(argrest, "vh") == 0)
2817 msg_action = MSG_SHOW_HEADER;
2818 one_msg_action = TRUE;
2820 else if (Ustrcmp(argrest, "vl") == 0)
2822 msg_action = MSG_SHOW_LOG;
2823 one_msg_action = TRUE;
2825 else { badarg = TRUE; break; }
2827 /* All the -Mxx options require at least one message id. */
2829 msg_action_arg = i + 1;
2830 if (msg_action_arg >= argc)
2832 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2833 return EXIT_FAILURE;
2836 /* Some require only message ids to follow */
2838 if (!one_msg_action)
2841 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2843 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2845 return EXIT_FAILURE;
2847 goto END_ARG; /* Remaining args are ids */
2850 /* Others require only one message id, possibly followed by addresses,
2851 which will be handled as normal arguments. */
2855 if (!mac_ismsgid(argv[msg_action_arg]))
2857 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2858 argv[msg_action_arg], arg);
2859 return EXIT_FAILURE;
2866 /* Some programs seem to call the -om option without the leading o;
2867 for sendmail it askes for "me too". Exim always does this. */
2870 if (*argrest != 0) badarg = TRUE;
2874 /* -N: don't do delivery - a debugging option that stops transports doing
2875 their thing. It implies debugging at the D_v level. */
2880 dont_deliver = TRUE;
2881 debug_selector |= D_v;
2882 debug_file = stderr;
2888 /* -n: This means "don't alias" in sendmail, apparently.
2889 For normal invocations, it has no effect.
2890 It may affect some other options. */
2896 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2897 option to the specified value. This form uses long names. We need to handle
2898 -O option=value and -Ooption=value. */
2905 fprintf(stderr, "exim: string expected after -O\n");
2913 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2916 if (*argrest == 'A')
2918 alias_arg = argrest + 1;
2919 if (alias_arg[0] == 0)
2921 if (i+1 < argc) alias_arg = argv[++i]; else
2923 fprintf(stderr, "exim: string expected after -oA\n");
2929 /* -oB: Set a connection message max value for remote deliveries */
2931 else if (*argrest == 'B')
2933 uschar *p = argrest + 1;
2936 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2938 connection_max_messages = 1;
2947 fprintf(stderr, "exim: number expected after -oB\n");
2950 connection_max_messages = Uatoi(p);
2954 /* -odb: background delivery */
2956 else if (Ustrcmp(argrest, "db") == 0)
2958 synchronous_delivery = FALSE;
2959 arg_queue_only = FALSE;
2960 queue_only_set = TRUE;
2963 /* -odf: foreground delivery (smail-compatible option); same effect as
2964 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2967 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2969 synchronous_delivery = TRUE;
2970 arg_queue_only = FALSE;
2971 queue_only_set = TRUE;
2974 /* -odq: queue only */
2976 else if (Ustrcmp(argrest, "dq") == 0)
2978 synchronous_delivery = FALSE;
2979 arg_queue_only = TRUE;
2980 queue_only_set = TRUE;
2983 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2984 but no remote delivery */
2986 else if (Ustrcmp(argrest, "dqs") == 0)
2989 arg_queue_only = FALSE;
2990 queue_only_set = TRUE;
2993 /* -oex: Sendmail error flags. As these are also accepted without the
2994 leading -o prefix, for compatibility with vacation and other callers,
2995 they are handled with -e above. */
2997 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2998 -oitrue: Another sendmail syntax for the same */
3000 else if (Ustrcmp(argrest, "i") == 0 ||
3001 Ustrcmp(argrest, "itrue") == 0)
3004 /* -oM*: Set various characteristics for an incoming message; actually
3005 acted on for trusted callers only. */
3007 else if (*argrest == 'M')
3011 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3015 /* -oMa: Set sender host address */
3017 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3019 /* -oMaa: Set authenticator name */
3021 else if (Ustrcmp(argrest, "Maa") == 0)
3022 sender_host_authenticated = argv[++i];
3024 /* -oMas: setting authenticated sender */
3026 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3028 /* -oMai: setting authenticated id */
3030 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3032 /* -oMi: Set incoming interface address */
3034 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3036 /* -oMm: Message reference */
3038 else if (Ustrcmp(argrest, "Mm") == 0)
3040 if (!mac_ismsgid(argv[i+1]))
3042 fprintf(stderr,"-oMm must be a valid message ID\n");
3045 if (!trusted_config)
3047 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3050 message_reference = argv[++i];
3053 /* -oMr: Received protocol */
3055 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3057 /* -oMs: Set sender host name */
3059 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3061 /* -oMt: Set sender ident */
3063 else if (Ustrcmp(argrest, "Mt") == 0)
3065 sender_ident_set = TRUE;
3066 sender_ident = argv[++i];
3069 /* Else a bad argument */
3078 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3079 seem to call this as -m (undocumented), so that is also accepted (see
3082 else if (Ustrcmp(argrest, "m") == 0) {}
3084 /* -oo: An ancient flag for old-style addresses which still seems to
3085 crop up in some calls (see in SCO). */
3087 else if (Ustrcmp(argrest, "o") == 0) {}
3089 /* -oP <name>: set pid file path for daemon */
3091 else if (Ustrcmp(argrest, "P") == 0)
3092 override_pid_file_path = argv[++i];
3094 /* -or <n>: set timeout for non-SMTP acceptance
3095 -os <n>: set timeout for SMTP acceptance */
3097 else if (*argrest == 'r' || *argrest == 's')
3099 int *tp = (*argrest == 'r')?
3100 &arg_receive_timeout : &arg_smtp_receive_timeout;
3101 if (argrest[1] == 0)
3103 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3105 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3108 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3113 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3115 else if (Ustrcmp(argrest, "X") == 0)
3116 override_local_interfaces = argv[++i];
3118 /* Unknown -o argument */
3124 /* -ps: force Perl startup; -pd force delayed Perl startup */
3128 if (*argrest == 's' && argrest[1] == 0)
3130 perl_start_option = 1;
3133 if (*argrest == 'd' && argrest[1] == 0)
3135 perl_start_option = -1;
3140 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3141 which sets the host protocol and host name */
3145 if (i+1 < argc) argrest = argv[++i]; else
3146 { badarg = TRUE; break; }
3151 uschar *hn = Ustrchr(argrest, ':');
3154 received_protocol = argrest;
3158 received_protocol = string_copyn(argrest, hn - argrest);
3159 sender_host_name = hn + 1;
3166 receiving_message = FALSE;
3167 if (queue_interval >= 0)
3169 fprintf(stderr, "exim: -q specified more than once\n");
3173 /* -qq...: Do queue runs in a 2-stage manner */
3175 if (*argrest == 'q')
3177 queue_2stage = TRUE;
3181 /* -qi...: Do only first (initial) deliveries */
3183 if (*argrest == 'i')
3185 queue_run_first_delivery = TRUE;
3189 /* -qf...: Run the queue, forcing deliveries
3190 -qff..: Ditto, forcing thawing as well */
3192 if (*argrest == 'f')
3194 queue_run_force = TRUE;
3195 if (*(++argrest) == 'f')
3197 deliver_force_thaw = TRUE;
3202 /* -q[f][f]l...: Run the queue only on local deliveries */
3204 if (*argrest == 'l')
3206 queue_run_local = TRUE;
3210 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3211 optionally starting from a given message id. */
3213 if (*argrest == 0 &&
3214 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3217 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3218 start_queue_run_id = argv[++i];
3219 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3220 stop_queue_run_id = argv[++i];
3223 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3224 optionally local only. */
3229 queue_interval = readconf_readtime(argrest, 0, FALSE);
3231 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3232 if (queue_interval <= 0)
3234 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3241 case 'R': /* Synonymous with -qR... */
3242 receiving_message = FALSE;
3244 /* -Rf: As -R (below) but force all deliveries,
3245 -Rff: Ditto, but also thaw all frozen messages,
3246 -Rr: String is regex
3247 -Rrf: Regex and force
3248 -Rrff: Regex and force and thaw
3250 in all cases provided there are no further characters in this
3256 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3258 if (Ustrcmp(argrest, rsopts[i]) == 0)
3260 if (i != 2) queue_run_force = TRUE;
3261 if (i >= 2) deliver_selectstring_regex = TRUE;
3262 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3263 argrest += Ustrlen(rsopts[i]);
3268 /* -R: Set string to match in addresses for forced queue run to
3269 pick out particular messages. */
3273 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3275 fprintf(stderr, "exim: string expected after -R\n");
3279 else deliver_selectstring = argrest;
3283 /* -r: an obsolete synonym for -f (see above) */
3286 /* -S: Like -R but works on sender. */
3288 case 'S': /* Synonymous with -qS... */
3289 receiving_message = FALSE;
3291 /* -Sf: As -S (below) but force all deliveries,
3292 -Sff: Ditto, but also thaw all frozen messages,
3293 -Sr: String is regex
3294 -Srf: Regex and force
3295 -Srff: Regex and force and thaw
3297 in all cases provided there are no further characters in this
3303 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3305 if (Ustrcmp(argrest, rsopts[i]) == 0)
3307 if (i != 2) queue_run_force = TRUE;
3308 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3309 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3310 argrest += Ustrlen(rsopts[i]);
3315 /* -S: Set string to match in addresses for forced queue run to
3316 pick out particular messages. */
3320 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3322 fprintf(stderr, "exim: string expected after -S\n");
3326 else deliver_selectstring_sender = argrest;
3329 /* -Tqt is an option that is exclusively for use by the testing suite.
3330 It is not recognized in other circumstances. It allows for the setting up
3331 of explicit "queue times" so that various warning/retry things can be
3332 tested. Otherwise variability of clock ticks etc. cause problems. */
3335 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3336 fudged_queue_times = argv[++i];
3341 /* -t: Set flag to extract recipients from body of message. */
3344 if (*argrest == 0) extract_recipients = TRUE;
3346 /* -ti: Set flag to extract recipients from body of message, and also
3347 specify that dot does not end the message. */
3349 else if (Ustrcmp(argrest, "i") == 0)
3351 extract_recipients = TRUE;
3355 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3358 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3365 /* -U: This means "initial user submission" in sendmail, apparently. The
3366 doc claims that in future sendmail may refuse syntactically invalid
3367 messages instead of fixing them. For the moment, we just ignore it. */
3373 /* -v: verify things - this is a very low-level debugging */
3378 debug_selector |= D_v;
3379 debug_file = stderr;
3385 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3387 The -x flag tells the sendmail command that mail from a local
3388 mail program has National Language Support (NLS) extended characters
3389 in the body of the mail item. The sendmail command can send mail with
3390 extended NLS characters across networks that normally corrupts these
3393 As Exim is 8-bit clean, it just ignores this flag. */
3396 if (*argrest != 0) badarg = TRUE;
3399 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3400 logs to that file. We swallow the parameter and otherwise ignore it. */
3403 if (*argrest == '\0')
3406 fprintf(stderr, "exim: string expected after -X\n");
3412 if (*argrest == '\0')
3413 if (++i < argc) log_oneline = argv[i]; else
3415 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3420 /* All other initial characters are errors */
3425 } /* End of high-level switch statement */
3427 /* Failed to recognize the option, or syntax error */
3431 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3432 "option %s\n", arg);
3438 /* If -R or -S have been specified without -q, assume a single queue run. */
3440 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3441 queue_interval < 0) queue_interval = 0;
3445 /* If usage_wanted is set we call the usage function - which never returns */
3446 if (usage_wanted) exim_usage(called_as);
3448 /* Arguments have been processed. Check for incompatibilities. */
3450 (smtp_input || extract_recipients || recipients_arg < argc) &&
3451 (daemon_listen || queue_interval >= 0 || bi_option ||
3452 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3453 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3456 msg_action_arg > 0 &&
3457 (daemon_listen || queue_interval >= 0 || list_options ||
3458 (checking && msg_action != MSG_LOAD) ||
3459 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3462 (daemon_listen || queue_interval >= 0) &&
3463 (sender_address != NULL || list_options || list_queue || checking ||
3467 daemon_listen && queue_interval == 0
3470 inetd_wait_mode && queue_interval >= 0
3474 (checking || smtp_input || extract_recipients ||
3475 filter_test != FTEST_NONE || bi_option)
3478 verify_address_mode &&
3479 (address_test_mode || smtp_input || extract_recipients ||
3480 filter_test != FTEST_NONE || bi_option)
3483 address_test_mode && (smtp_input || extract_recipients ||
3484 filter_test != FTEST_NONE || bi_option)
3487 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3491 deliver_selectstring != NULL && queue_interval < 0
3494 msg_action == MSG_LOAD &&
3495 (!expansion_test || expansion_test_message != NULL)
3499 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3503 /* If debugging is set up, set the file and the file descriptor to pass on to
3504 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3505 to run in the foreground. */
3507 if (debug_selector != 0)
3509 debug_file = stderr;
3510 debug_fd = fileno(debug_file);
3511 background_daemon = FALSE;
3512 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3513 if (debug_selector != D_v) /* -v only doesn't show this */
3515 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3516 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3518 if (!version_printed)
3519 show_whats_supported(stderr);
3523 /* When started with root privilege, ensure that the limits on the number of
3524 open files and the number of processes (where that is accessible) are
3525 sufficiently large, or are unset, in case Exim has been called from an
3526 environment where the limits are screwed down. Not all OS have the ability to
3527 change some of these limits. */
3531 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3537 #ifdef RLIMIT_NOFILE
3538 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3540 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3542 rlp.rlim_cur = rlp.rlim_max = 0;
3545 /* I originally chose 1000 as a nice big number that was unlikely to
3546 be exceeded. It turns out that some older OS have a fixed upper limit of
3549 if (rlp.rlim_cur < 1000)
3551 rlp.rlim_cur = rlp.rlim_max = 1000;
3552 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3554 rlp.rlim_cur = rlp.rlim_max = 256;
3555 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3556 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3563 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3565 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3567 rlp.rlim_cur = rlp.rlim_max = 0;
3570 #ifdef RLIM_INFINITY
3571 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3573 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3575 if (rlp.rlim_cur < 1000)
3577 rlp.rlim_cur = rlp.rlim_max = 1000;
3579 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3580 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3586 /* Exim is normally entered as root (but some special configurations are
3587 possible that don't do this). However, it always spins off sub-processes that
3588 set their uid and gid as required for local delivery. We don't want to pass on
3589 any extra groups that root may belong to, so we want to get rid of them all at
3592 We need to obey setgroups() at this stage, before possibly giving up root
3593 privilege for a changed configuration file, but later on we might need to
3594 check on the additional groups for the admin user privilege - can't do that
3595 till after reading the config, which might specify the exim gid. Therefore,
3596 save the group list here first. */
3598 group_count = getgroups(NGROUPS_MAX, group_list);
3599 if (group_count < 0)
3601 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3605 /* There is a fundamental difference in some BSD systems in the matter of
3606 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3607 known not to be different. On the "different" systems there is a single group
3608 list, and the first entry in it is the current group. On all other versions of
3609 Unix there is a supplementary group list, which is in *addition* to the current
3610 group. Consequently, to get rid of all extraneous groups on a "standard" system
3611 you pass over 0 groups to setgroups(), while on a "different" system you pass
3612 over a single group - the current group, which is always the first group in the
3613 list. Calling setgroups() with zero groups on a "different" system results in
3614 an error return. The following code should cope with both types of system.
3616 However, if this process isn't running as root, setgroups() can't be used
3617 since you have to be root to run it, even if throwing away groups. Not being
3618 root here happens only in some unusual configurations. We just ignore the
3621 if (setgroups(0, NULL) != 0)
3623 if (setgroups(1, group_list) != 0 && !unprivileged)
3625 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3630 /* If the configuration file name has been altered by an argument on the
3631 command line (either a new file name or a macro definition) and the caller is
3632 not root, or if this is a filter testing run, remove any setuid privilege the
3633 program has and run as the underlying user.
3635 The exim user is locked out of this, which severely restricts the use of -C
3638 Otherwise, set the real ids to the effective values (should be root unless run
3639 from inetd, which it can either be root or the exim uid, if one is configured).
3641 There is a private mechanism for bypassing some of this, in order to make it
3642 possible to test lots of configurations automatically, without having either to
3643 recompile each time, or to patch in an actual configuration file name and other
3644 values (such as the path name). If running in the test harness, pretend that
3645 configuration file changes and macro definitions haven't happened. */
3648 (!trusted_config || /* Config changed, or */
3649 !macros_trusted()) && /* impermissible macros and */
3650 real_uid != root_uid && /* Not root, and */
3651 !running_in_test_harness /* Not fudged */
3653 expansion_test /* expansion testing */
3655 filter_test != FTEST_NONE) /* Filter testing */
3657 setgroups(group_count, group_list);
3658 exim_setugid(real_uid, real_gid, FALSE,
3659 US"-C, -D, -be or -bf forces real uid");
3660 removed_privilege = TRUE;
3662 /* In the normal case when Exim is called like this, stderr is available
3663 and should be used for any logging information because attempts to write
3664 to the log will usually fail. To arrange this, we unset really_exim. However,
3665 if no stderr is available there is no point - we might as well have a go
3666 at the log (if it fails, syslog will be written).
3668 Note that if the invoker is Exim, the logs remain available. Messing with
3669 this causes unlogged successful deliveries. */
3671 if ((log_stderr != NULL) && (real_uid != exim_uid))
3672 really_exim = FALSE;
3675 /* Privilege is to be retained for the moment. It may be dropped later,
3676 depending on the job that this Exim process has been asked to do. For now, set
3677 the real uid to the effective so that subsequent re-execs of Exim are done by a
3680 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3682 /* If testing a filter, open the file(s) now, before wasting time doing other
3683 setups and reading the message. */
3685 if ((filter_test & FTEST_SYSTEM) != 0)
3687 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3690 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3692 return EXIT_FAILURE;
3696 if ((filter_test & FTEST_USER) != 0)
3698 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3701 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3703 return EXIT_FAILURE;
3707 /* Initialise lookup_list
3708 If debugging, already called above via version reporting.
3709 In either case, we initialise the list of available lookups while running
3710 as root. All dynamically modules are loaded from a directory which is
3711 hard-coded into the binary and is code which, if not a module, would be
3712 part of Exim already. Ability to modify the content of the directory
3713 is equivalent to the ability to modify a setuid binary!
3715 This needs to happen before we read the main configuration. */
3718 #ifdef EXPERIMENTAL_INTERNATIONAL
3719 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3722 /* Read the main runtime configuration data; this gives up if there
3723 is a failure. It leaves the configuration file open so that the subsequent
3724 configuration data for delivery can be read if needed. */
3726 /* To be safe: change the working directory to /. */
3727 if (Uchdir("/") < 0)
3729 perror("exim: chdir `/': ");
3735 if (cleanup_environment() == FALSE)
3736 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3739 /* If an action on specific messages is requested, or if a daemon or queue
3740 runner is being started, we need to know if Exim was called by an admin user.
3741 This is the case if the real user is root or exim, or if the real group is
3742 exim, or if one of the supplementary groups is exim or a group listed in
3743 admin_groups. We don't fail all message actions immediately if not admin_user,
3744 since some actions can be performed by non-admin users. Instead, set admin_user
3745 for later interrogation. */
3747 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3752 for (i = 0; i < group_count; i++)
3754 if (group_list[i] == exim_gid) admin_user = TRUE;
3755 else if (admin_groups != NULL)
3757 for (j = 1; j <= (int)(admin_groups[0]); j++)
3758 if (admin_groups[j] == group_list[i])
3759 { admin_user = TRUE; break; }
3761 if (admin_user) break;
3765 /* Another group of privileged users are the trusted users. These are root,
3766 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3767 are permitted to specify sender_addresses with -f on the command line, and
3768 other message parameters as well. */
3770 if (real_uid == root_uid || real_uid == exim_uid)
3771 trusted_caller = TRUE;
3776 if (trusted_users != NULL)
3778 for (i = 1; i <= (int)(trusted_users[0]); i++)
3779 if (trusted_users[i] == real_uid)
3780 { trusted_caller = TRUE; break; }
3783 if (!trusted_caller && trusted_groups != NULL)
3785 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3787 if (trusted_groups[i] == real_gid)
3788 trusted_caller = TRUE;
3789 else for (j = 0; j < group_count; j++)
3791 if (trusted_groups[i] == group_list[j])
3792 { trusted_caller = TRUE; break; }
3794 if (trusted_caller) break;
3799 /* Handle the decoding of logging options. */
3801 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3802 log_selector_string, log_options, log_options_count, US"log", 0);
3806 debug_printf("configuration file is %s\n", config_main_filename);
3807 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3808 log_extra_selector);
3811 /* If domain literals are not allowed, check the sender address that was
3812 supplied with -f. Ditto for a stripped trailing dot. */
3814 if (sender_address != NULL)
3816 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3818 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3819 "allowed\n", sender_address);
3820 return EXIT_FAILURE;
3822 if (f_end_dot && !strip_trailing_dot)
3824 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3825 "(trailing dot not allowed)\n", sender_address);
3826 return EXIT_FAILURE;
3830 /* See if an admin user overrode our logging. */
3832 if (cmdline_syslog_name != NULL)
3836 syslog_processname = cmdline_syslog_name;
3837 log_file_path = string_copy(CUS"syslog");
3841 /* not a panic, non-privileged users should not be able to spam paniclog */
3843 "exim: you lack sufficient privilege to specify syslog process name\n");
3844 return EXIT_FAILURE;
3848 /* Paranoia check of maximum lengths of certain strings. There is a check
3849 on the length of the log file path in log.c, which will come into effect
3850 if there are any calls to write the log earlier than this. However, if we
3851 get this far but the string is very long, it is better to stop now than to
3852 carry on and (e.g.) receive a message and then have to collapse. The call to
3853 log_write() from here will cause the ultimate panic collapse if the complete
3854 file name exceeds the buffer length. */
3856 if (Ustrlen(log_file_path) > 200)
3857 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3858 "log_file_path is longer than 200 chars: aborting");
3860 if (Ustrlen(pid_file_path) > 200)
3861 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3862 "pid_file_path is longer than 200 chars: aborting");
3864 if (Ustrlen(spool_directory) > 200)
3865 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3866 "spool_directory is longer than 200 chars: aborting");
3868 /* Length check on the process name given to syslog for its TAG field,
3869 which is only permitted to be 32 characters or less. See RFC 3164. */
3871 if (Ustrlen(syslog_processname) > 32)
3872 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3873 "syslog_processname is longer than 32 chars: aborting");
3879 log_write(0, LOG_MAIN, "%s", log_oneline);
3880 return EXIT_SUCCESS;
3883 return EXIT_FAILURE;
3886 /* In some operating systems, the environment variable TMPDIR controls where
3887 temporary files are created; Exim doesn't use these (apart from when delivering
3888 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3889 If TMPDIR is found in the environment, reset it to the value defined in the
3890 TMPDIR macro, if this macro is defined. */
3895 if (environ) for (p = USS environ; *p != NULL; p++)
3897 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3898 Ustrcmp(*p+7, TMPDIR) != 0)
3900 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3901 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3903 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3909 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3910 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3911 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3912 called by a user who has set the TZ variable. This then affects the timestamps
3913 in log files and in Received: headers, and any created Date: header lines. The
3914 required timezone is settable in the configuration file, so nothing can be done
3915 about this earlier - but hopefully nothing will normally be logged earlier than
3916 this. We have to make a new environment if TZ is wrong, but don't bother if
3917 timestamps_utc is set, because then all times are in UTC anyway. */
3919 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3921 timestamps_utc = TRUE;
3925 uschar *envtz = US getenv("TZ");
3926 if ((envtz == NULL && timezone_string != NULL) ||
3928 (timezone_string == NULL ||
3929 Ustrcmp(timezone_string, envtz) != 0)))
3931 uschar **p = USS environ;
3935 if (environ) while (*p++ != NULL) count++;
3936 if (envtz == NULL) count++;
3937 newp = new = malloc(sizeof(uschar *) * (count + 1));
3938 if (environ) for (p = USS environ; *p != NULL; p++)
3940 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3943 if (timezone_string != NULL)
3945 *newp = malloc(Ustrlen(timezone_string) + 4);
3946 sprintf(CS *newp++, "TZ=%s", timezone_string);
3951 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3952 tod_stamp(tod_log));
3956 /* Handle the case when we have removed the setuid privilege because of -C or
3957 -D. This means that the caller of Exim was not root.
3959 There is a problem if we were running as the Exim user. The sysadmin may
3960 expect this case to retain privilege because "the binary was called by the
3961 Exim user", but it hasn't, because either the -D option set macros, or the
3962 -C option set a non-trusted configuration file. There are two possibilities:
3964 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3965 to do message deliveries. Thus, the fact that it is running as a
3966 non-privileged user is plausible, and might be wanted in some special
3967 configurations. However, really_exim will have been set false when
3968 privilege was dropped, to stop Exim trying to write to its normal log
3969 files. Therefore, re-enable normal log processing, assuming the sysadmin
3970 has set up the log directory correctly.
3972 (2) If deliver_drop_privilege is not set, the configuration won't work as
3973 apparently intended, and so we log a panic message. In order to retain
3974 root for -C or -D, the caller must either be root or be invoking a
3975 trusted configuration file (when deliver_drop_privilege is false). */
3977 if (removed_privilege && (!trusted_config || macros != NULL) &&
3978 real_uid == exim_uid)
3980 if (deliver_drop_privilege)
3981 really_exim = TRUE; /* let logging work normally */
3983 log_write(0, LOG_MAIN|LOG_PANIC,
3984 "exim user lost privilege for using %s option",
3985 trusted_config? "-D" : "-C");
3988 /* Start up Perl interpreter if Perl support is configured and there is a
3989 perl_startup option, and the configuration or the command line specifies
3990 initializing starting. Note that the global variables are actually called
3991 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3994 if (perl_start_option != 0)
3995 opt_perl_at_start = (perl_start_option > 0);
3996 if (opt_perl_at_start && opt_perl_startup != NULL)
3999 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4000 errstr = init_perl(opt_perl_startup);
4003 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4004 return EXIT_FAILURE;
4006 opt_perl_started = TRUE;
4008 #endif /* EXIM_PERL */
4010 /* Log the arguments of the call if the configuration file said so. This is
4011 a debugging feature for finding out what arguments certain MUAs actually use.
4012 Don't attempt it if logging is disabled, or if listing variables or if
4013 verifying/testing addresses or expansions. */
4015 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
4016 && really_exim && !list_options && !checking)
4019 uschar *p = big_buffer;
4021 Ustrcpy(p, "cwd= (failed)");
4022 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4024 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4026 for (i = 0; i < argc; i++)
4028 int len = Ustrlen(argv[i]);
4029 const uschar *printing;
4031 if (p + len + 8 >= big_buffer + big_buffer_size)
4034 log_write(0, LOG_MAIN, "%s", big_buffer);
4035 Ustrcpy(big_buffer, "...");
4038 printing = string_printing(argv[i]);
4039 if (printing[0] == 0) quote = US"\""; else
4041 const uschar *pp = printing;
4043 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4045 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4046 (p - big_buffer) - 4), printing, quote);
4050 if ((log_extra_selector & LX_arguments) != 0)
4051 log_write(0, LOG_MAIN, "%s", big_buffer);
4053 debug_printf("%s\n", big_buffer);
4056 /* Set the working directory to be the top-level spool directory. We don't rely
4057 on this in the code, which always uses fully qualified names, but it's useful
4058 for core dumps etc. Don't complain if it fails - the spool directory might not
4059 be generally accessible and calls with the -C option (and others) have lost
4060 privilege by now. Before the chdir, we try to ensure that the directory exists.
4063 if (Uchdir(spool_directory) != 0)
4066 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4067 dummy = /* quieten compiler */ Uchdir(spool_directory);
4070 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4071 alias file. Exim doesn't have such a concept, but this call is screwed into
4072 Sun's YP makefiles. Handle this by calling a configured script, as the real
4073 user who called Exim. The -oA option can be used to pass an argument to the
4078 (void)fclose(config_file);
4079 if (bi_command != NULL)
4083 argv[i++] = bi_command;
4084 if (alias_arg != NULL) argv[i++] = alias_arg;
4087 setgroups(group_count, group_list);
4088 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4090 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4091 (argv[1] == NULL)? US"" : argv[1]);
4093 execv(CS argv[0], (char *const *)argv);
4094 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4099 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4104 /* We moved the admin/trusted check to be immediately after reading the
4105 configuration file. We leave these prints here to ensure that syslog setup,
4106 logfile setup, and so on has already happened. */
4108 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4109 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4111 /* Only an admin user may start the daemon or force a queue run in the default
4112 configuration, but the queue run restriction can be relaxed. Only an admin
4113 user may request that a message be returned to its sender forthwith. Only an
4114 admin user may specify a debug level greater than D_v (because it might show
4115 passwords, etc. in lookup queries). Only an admin user may request a queue
4116 count. Only an admin user can use the test interface to scan for email
4117 (because Exim will be in the spool dir and able to look at mails). */
4121 BOOL debugset = (debug_selector & ~D_v) != 0;
4122 if (deliver_give_up || daemon_listen || malware_test_file ||
4123 (count_queue && queue_list_requires_admin) ||
4124 (list_queue && queue_list_requires_admin) ||
4125 (queue_interval >= 0 && prod_requires_admin) ||
4126 (debugset && !running_in_test_harness))
4128 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4133 /* If the real user is not root or the exim uid, the argument for passing
4134 in an open TCP/IP connection for another message is not permitted, nor is
4135 running with the -N option for any delivery action, unless this call to exim is
4136 one that supplied an input message, or we are using a patched exim for
4137 regression testing. */
4139 if (real_uid != root_uid && real_uid != exim_uid &&
4140 (continue_hostname != NULL ||
4142 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4143 )) && !running_in_test_harness)
4145 fprintf(stderr, "exim: Permission denied\n");
4146 return EXIT_FAILURE;
4149 /* If the caller is not trusted, certain arguments are ignored when running for
4150 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4151 Note that authority for performing certain actions on messages is tested in the
4152 queue_action() function. */
4154 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4156 sender_host_name = sender_host_address = interface_address =
4157 sender_ident = received_protocol = NULL;
4158 sender_host_port = interface_port = 0;
4159 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4162 /* If a sender host address is set, extract the optional port number off the
4163 end of it and check its syntax. Do the same thing for the interface address.
4164 Exim exits if the syntax is bad. */
4168 if (sender_host_address != NULL)
4169 sender_host_port = check_port(sender_host_address);
4170 if (interface_address != NULL)
4171 interface_port = check_port(interface_address);
4174 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4179 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4180 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4184 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4185 return EXIT_FAILURE;
4189 /* If an SMTP message is being received check to see if the standard input is a
4190 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4191 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4196 union sockaddr_46 inetd_sock;
4197 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4198 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4200 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4201 if (family == AF_INET || family == AF_INET6)
4203 union sockaddr_46 interface_sock;
4204 size = sizeof(interface_sock);
4206 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4207 interface_address = host_ntoa(-1, &interface_sock, NULL,
4210 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4212 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4215 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4216 NULL, &sender_host_port);
4217 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4218 "inetd is not supported when mua_wrapper is set");
4223 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4224 return EXIT_FAILURE;
4230 /* If the load average is going to be needed while receiving a message, get it
4231 now for those OS that require the first call to os_getloadavg() to be done as
4232 root. There will be further calls later for each message received. */
4234 #ifdef LOAD_AVG_NEEDS_ROOT
4235 if (receiving_message &&
4236 (queue_only_load >= 0 ||
4237 (is_inetd && smtp_load_reserve >= 0)
4240 load_average = OS_GETLOADAVG();
4244 /* The queue_only configuration option can be overridden by -odx on the command
4245 line, except that if queue_only_override is false, queue_only cannot be unset
4246 from the command line. */
4248 if (queue_only_set && (queue_only_override || arg_queue_only))
4249 queue_only = arg_queue_only;
4251 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4254 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4255 if (arg_smtp_receive_timeout >= 0)
4256 smtp_receive_timeout = arg_smtp_receive_timeout;
4258 /* If Exim was started with root privilege, unless we have already removed the
4259 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4260 except when starting the daemon or doing some kind of delivery or address
4261 testing (-bt). These are the only cases when root need to be retained. We run
4262 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4263 retained only for starting the daemon. We always do the initgroups() in this
4264 situation (controlled by the TRUE below), in order to be as close as possible
4265 to the state Exim usually runs in. */
4267 if (!unprivileged && /* originally had root AND */
4268 !removed_privilege && /* still got root AND */
4269 !daemon_listen && /* not starting the daemon */
4270 queue_interval <= 0 && /* (either kind of daemon) */
4272 deliver_drop_privilege || /* requested unprivileged */
4274 queue_interval < 0 && /* not running the queue */
4275 (msg_action_arg < 0 || /* and */
4276 msg_action != MSG_DELIVER) && /* not delivering and */
4277 (!checking || !address_test_mode) /* not address checking */
4281 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4284 /* When we are retaining a privileged uid, we still change to the exim gid. */
4289 rv = setgid(exim_gid);
4290 /* Impact of failure is that some stuff might end up with an incorrect group.
4291 We track this for failures from root, since any attempt to change privilege
4292 by root should succeed and failures should be examined. For non-root,
4293 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4294 no need to complain then. */
4297 if (!(unprivileged || removed_privilege))
4300 "exim: changing group failed: %s\n", strerror(errno));
4304 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4305 (long int)exim_gid, strerror(errno));
4309 /* Handle a request to scan a file for malware */
4310 if (malware_test_file)
4312 #ifdef WITH_CONTENT_SCAN
4314 set_process_info("scanning file for malware");
4315 result = malware_in_file(malware_test_file);
4318 printf("No malware found.\n");
4323 printf("Malware lookup returned non-okay/fail: %d\n", result);
4327 printf("Malware found: %s\n", malware_name);
4329 printf("Malware scan detected malware of unknown name.\n");
4331 printf("Malware scanning not enabled at compile time.\n");
4336 /* Handle a request to list the delivery queue */
4340 set_process_info("listing the queue");
4341 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4345 /* Handle a request to count the delivery queue */
4349 set_process_info("counting the queue");
4354 /* Handle actions on specific messages, except for the force delivery and
4355 message load actions, which are done below. Some actions take a whole list of
4356 message ids, which are known to continue up to the end of the arguments. Others
4357 take a single message id and then operate on the recipients list. */
4359 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4361 int yield = EXIT_SUCCESS;
4362 set_process_info("acting on specified messages");
4364 if (!one_msg_action)
4366 for (i = msg_action_arg; i < argc; i++)
4367 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4368 yield = EXIT_FAILURE;
4371 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4372 recipients_arg)) yield = EXIT_FAILURE;
4376 /* We used to set up here to skip reading the ACL section, on
4377 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4378 Now, since the intro of the ${acl } expansion, ACL definitions may be
4379 needed in transports so we lost the optimisation. */
4383 /* The configuration data will have been read into POOL_PERM because we won't
4384 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4385 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4386 configuration were read into POOL_MAIN, because we don't do any resets till
4387 later on. However, it seems right, and it does ensure that both pools get used.
4390 store_pool = POOL_MAIN;
4392 /* Handle the -brt option. This is for checking out retry configurations.
4393 The next three arguments are a domain name or a complete address, and
4394 optionally two error numbers. All it does is to call the function that
4395 scans the retry configuration data. */
4397 if (test_retry_arg >= 0)
4399 retry_config *yield;
4400 int basic_errno = 0;
4404 if (test_retry_arg >= argc)
4406 printf("-brt needs a domain or address argument\n");
4407 exim_exit(EXIT_FAILURE);
4409 s1 = argv[test_retry_arg++];
4412 /* If the first argument contains no @ and no . it might be a local user
4413 or it might be a single-component name. Treat as a domain. */
4415 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4417 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4418 "being \ntreated as a one-component domain, not as a local part.\n\n",
4422 /* There may be an optional second domain arg. */
4424 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4425 s2 = argv[test_retry_arg++];
4427 /* The final arg is an error name */
4429 if (test_retry_arg < argc)
4431 uschar *ss = argv[test_retry_arg];
4433 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4436 printf("%s\n", CS error);
4437 return EXIT_FAILURE;
4440 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4441 code > 100 as an error is for matching codes to the decade. Turn them into
4442 a real error code, off the decade. */
4444 if (basic_errno == ERRNO_MAIL4XX ||
4445 basic_errno == ERRNO_RCPT4XX ||
4446 basic_errno == ERRNO_DATA4XX)
4448 int code = (more_errno >> 8) & 255;
4450 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4451 else if (code > 100)
4452 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4456 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4457 if (yield == NULL) printf("No retry information found\n"); else
4460 more_errno = yield->more_errno;
4461 printf("Retry rule: %s ", yield->pattern);
4463 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4465 printf("quota%s%s ",
4466 (more_errno > 0)? "_" : "",
4467 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4469 else if (yield->basic_errno == ECONNREFUSED)
4471 printf("refused%s%s ",
4472 (more_errno > 0)? "_" : "",
4473 (more_errno == 'M')? "MX" :
4474 (more_errno == 'A')? "A" : "");
4476 else if (yield->basic_errno == ETIMEDOUT)
4479 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4481 if (more_errno != 0) printf("_%s",
4482 (more_errno == 'M')? "MX" : "A");
4485 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4486 printf("auth_failed ");
4489 for (r = yield->rules; r != NULL; r = r->next)
4491 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4492 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4498 printf(",%d.", x/1000);
4512 exim_exit(EXIT_SUCCESS);
4515 /* Handle a request to list one or more configuration options */
4516 /* If -n was set, we suppress some information */
4520 set_process_info("listing variables");
4521 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4522 else for (i = recipients_arg; i < argc; i++)
4525 (Ustrcmp(argv[i], "router") == 0 ||
4526 Ustrcmp(argv[i], "transport") == 0 ||
4527 Ustrcmp(argv[i], "authenticator") == 0 ||
4528 Ustrcmp(argv[i], "macro") == 0 ||
4529 Ustrcmp(argv[i], "environment") == 0))
4531 readconf_print(argv[i+1], argv[i], flag_n);
4534 else readconf_print(argv[i], NULL, flag_n);
4536 exim_exit(EXIT_SUCCESS);
4540 /* Handle a request to deliver one or more messages that are already on the
4541 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4542 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4544 Delivery of specific messages is typically used for a small number when
4545 prodding by hand (when the option forced_delivery will be set) or when
4546 re-execing to regain root privilege. Each message delivery must happen in a
4547 separate process, so we fork a process for each one, and run them sequentially
4548 so that debugging output doesn't get intertwined, and to avoid spawning too
4549 many processes if a long list is given. However, don't fork for the last one;
4550 this saves a process in the common case when Exim is called to deliver just one
4553 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4555 if (prod_requires_admin && !admin_user)
4557 fprintf(stderr, "exim: Permission denied\n");
4558 exim_exit(EXIT_FAILURE);
4560 set_process_info("delivering specified messages");
4561 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4562 for (i = msg_action_arg; i < argc; i++)
4567 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4568 else if ((pid = fork()) == 0)
4570 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4571 _exit(EXIT_SUCCESS);
4575 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4577 exim_exit(EXIT_FAILURE);
4581 exim_exit(EXIT_SUCCESS);
4585 /* If only a single queue run is requested, without SMTP listening, we can just
4586 turn into a queue runner, with an optional starting message id. */
4588 if (queue_interval == 0 && !daemon_listen)
4590 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4591 (start_queue_run_id == NULL)? US"" : US" starting at ",
4592 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4593 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4594 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4595 set_process_info("running the queue (single queue run)");
4596 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4597 exim_exit(EXIT_SUCCESS);
4601 /* Find the login name of the real user running this process. This is always
4602 needed when receiving a message, because it is written into the spool file. It
4603 may also be used to construct a from: or a sender: header, and in this case we
4604 need the user's full name as well, so save a copy of it, checked for RFC822
4605 syntax and munged if necessary, if it hasn't previously been set by the -F
4606 argument. We may try to get the passwd entry more than once, in case NIS or
4607 other delays are in evidence. Save the home directory for use in filter testing
4612 if ((pw = getpwuid(real_uid)) != NULL)
4614 originator_login = string_copy(US pw->pw_name);
4615 originator_home = string_copy(US pw->pw_dir);
4617 /* If user name has not been set by -F, set it from the passwd entry
4618 unless -f has been used to set the sender address by a trusted user. */
4620 if (originator_name == NULL)
4622 if (sender_address == NULL ||
4623 (!trusted_caller && filter_test == FTEST_NONE))
4625 uschar *name = US pw->pw_gecos;
4626 uschar *amp = Ustrchr(name, '&');
4629 /* Most Unix specify that a '&' character in the gecos field is
4630 replaced by a copy of the login name, and some even specify that
4631 the first character should be upper cased, so that's what we do. */
4636 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4637 amp - name, name, &loffset, originator_login, amp + 1);
4638 buffer[loffset] = toupper(buffer[loffset]);
4642 /* If a pattern for matching the gecos field was supplied, apply
4643 it and then expand the name string. */
4645 if (gecos_pattern != NULL && gecos_name != NULL)
4648 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4650 if (regex_match_and_setup(re, name, 0, -1))
4652 uschar *new_name = expand_string(gecos_name);
4654 if (new_name != NULL)
4656 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4657 "gecos field \"%s\"\n", new_name, name);
4660 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4661 "\"%s\": %s\n", gecos_name, expand_string_message);
4663 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4664 "gecos field \"%s\"\n", gecos_pattern, name);
4665 store_free((void *)re);
4667 originator_name = string_copy(name);
4670 /* A trusted caller has used -f but not -F */
4672 else originator_name = US"";
4675 /* Break the retry loop */
4680 if (++i > finduser_retries) break;
4684 /* If we cannot get a user login, log the incident and give up, unless the
4685 configuration specifies something to use. When running in the test harness,
4686 any setting of unknown_login overrides the actual name. */
4688 if (originator_login == NULL || running_in_test_harness)
4690 if (unknown_login != NULL)
4692 originator_login = expand_string(unknown_login);
4693 if (originator_name == NULL && unknown_username != NULL)
4694 originator_name = expand_string(unknown_username);
4695 if (originator_name == NULL) originator_name = US"";
4697 if (originator_login == NULL)
4698 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4702 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4705 originator_name = string_copy(parse_fix_phrase(originator_name,
4706 Ustrlen(originator_name), big_buffer, big_buffer_size));
4708 /* If a message is created by this call of Exim, the uid/gid of its originator
4709 are those of the caller. These values are overridden if an existing message is
4710 read in from the spool. */
4712 originator_uid = real_uid;
4713 originator_gid = real_gid;
4715 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4716 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4718 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4719 returns. We leave this till here so that the originator_ fields are available
4720 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4723 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4727 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4728 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4729 "mua_wrapper is set");
4734 /* If the sender ident has not been set (by a trusted caller) set it to
4735 the caller. This will get overwritten below for an inetd call. If a trusted
4736 caller has set it empty, unset it. */
4738 if (sender_ident == NULL) sender_ident = originator_login;
4739 else if (sender_ident[0] == 0) sender_ident = NULL;
4741 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4742 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4743 originator_* variables set. */
4745 if (test_rewrite_arg >= 0)
4747 really_exim = FALSE;
4748 if (test_rewrite_arg >= argc)
4750 printf("-brw needs an address argument\n");
4751 exim_exit(EXIT_FAILURE);
4753 rewrite_test(argv[test_rewrite_arg]);
4754 exim_exit(EXIT_SUCCESS);
4757 /* A locally-supplied message is considered to be coming from a local user
4758 unless a trusted caller supplies a sender address with -f, or is passing in the
4759 message via SMTP (inetd invocation or otherwise). */
4761 if ((sender_address == NULL && !smtp_input) ||
4762 (!trusted_caller && filter_test == FTEST_NONE))
4764 sender_local = TRUE;
4766 /* A trusted caller can supply authenticated_sender and authenticated_id
4767 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4768 defaults except when host checking. */
4770 if (authenticated_sender == NULL && !host_checking)
4771 authenticated_sender = string_sprintf("%s@%s", originator_login,
4772 qualify_domain_sender);
4773 if (authenticated_id == NULL && !host_checking)
4774 authenticated_id = originator_login;
4777 /* Trusted callers are always permitted to specify the sender address.
4778 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4779 is specified is the empty address. However, if a trusted caller does not
4780 specify a sender address for SMTP input, we leave sender_address unset. This
4781 causes the MAIL commands to be honoured. */
4783 if ((!smtp_input && sender_address == NULL) ||
4784 !receive_check_set_sender(sender_address))
4786 /* Either the caller is not permitted to set a general sender, or this is
4787 non-SMTP input and the trusted caller has not set a sender. If there is no
4788 sender, or if a sender other than <> is set, override with the originator's
4789 login (which will get qualified below), except when checking things. */
4791 if (sender_address == NULL /* No sender_address set */
4793 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4794 !checking && /* Not running tests, AND */
4795 filter_test == FTEST_NONE)) /* Not testing a filter */
4797 sender_address = originator_login;
4798 sender_address_forced = FALSE;
4799 sender_address_domain = 0;
4803 /* Remember whether an untrusted caller set the sender address */
4805 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4807 /* Ensure that the sender address is fully qualified unless it is the empty
4808 address, which indicates an error message, or doesn't exist (root caller, smtp
4809 interface, no -f argument). */
4811 if (sender_address != NULL && sender_address[0] != 0 &&
4812 sender_address_domain == 0)
4813 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4814 qualify_domain_sender);
4816 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4818 /* Handle a request to verify a list of addresses, or test them for delivery.
4819 This must follow the setting of the sender address, since routers can be
4820 predicated upon the sender. If no arguments are given, read addresses from
4821 stdin. Set debug_level to at least D_v to get full output for address testing.
4824 if (verify_address_mode || address_test_mode)
4827 int flags = vopt_qualify;
4829 if (verify_address_mode)
4831 if (!verify_as_sender) flags |= vopt_is_recipient;
4832 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4837 flags |= vopt_is_recipient;
4838 debug_selector |= D_v;
4839 debug_file = stderr;
4840 debug_fd = fileno(debug_file);
4841 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4844 if (recipients_arg < argc)
4846 while (recipients_arg < argc)
4848 uschar *s = argv[recipients_arg++];
4851 BOOL finished = FALSE;
4852 uschar *ss = parse_find_address_end(s, FALSE);
4853 if (*ss == ',') *ss = 0; else finished = TRUE;
4854 test_address(s, flags, &exit_value);
4857 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4864 uschar *s = get_stdinput(NULL, NULL);
4865 if (s == NULL) break;
4866 test_address(s, flags, &exit_value);
4870 exim_exit(exit_value);
4873 /* Handle expansion checking. Either expand items on the command line, or read
4874 from stdin if there aren't any. If -Mset was specified, load the message so
4875 that its variables can be used, but restrict this facility to admin users.
4876 Otherwise, if -bem was used, read a message from stdin. */
4880 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4882 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4885 fprintf(stderr, "exim: permission denied\n");
4888 message_id = argv[msg_action_arg];
4889 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4890 if (!spool_open_datafile(message_id))
4891 printf ("Failed to load message datafile %s\n", message_id);
4892 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4893 printf ("Failed to load message %s\n", message_id);
4896 /* Read a test message from a file. We fudge it up to be on stdin, saving
4897 stdin itself for later reading of expansion strings. */
4899 else if (expansion_test_message != NULL)
4901 int save_stdin = dup(0);
4902 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4905 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4907 return EXIT_FAILURE;
4910 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4911 message_ended = END_NOTENDED;
4912 read_message_body(receive_msg(extract_recipients));
4913 message_linecount += body_linecount;
4914 (void)dup2(save_stdin, 0);
4915 (void)close(save_stdin);
4916 clearerr(stdin); /* Required by Darwin */
4919 /* Allow $recipients for this testing */
4921 enable_dollar_recipients = TRUE;
4923 /* Expand command line items */
4925 if (recipients_arg < argc)
4927 while (recipients_arg < argc)
4929 uschar *s = argv[recipients_arg++];
4930 uschar *ss = expand_string(s);
4931 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4932 else printf("%s\n", CS ss);
4940 char *(*fn_readline)(const char *) = NULL;
4941 void (*fn_addhist)(const char *) = NULL;
4944 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4950 uschar *source = get_stdinput(fn_readline, fn_addhist);
4951 if (source == NULL) break;
4952 ss = expand_string(source);
4954 printf ("Failed: %s\n", expand_string_message);
4955 else printf("%s\n", CS ss);
4959 if (dlhandle != NULL) dlclose(dlhandle);
4963 /* The data file will be open after -Mset */
4965 if (deliver_datafile >= 0)
4967 (void)close(deliver_datafile);
4968 deliver_datafile = -1;
4971 exim_exit(EXIT_SUCCESS);
4975 /* The active host name is normally the primary host name, but it can be varied
4976 for hosts that want to play several parts at once. We need to ensure that it is
4977 set for host checking, and for receiving messages. */
4979 smtp_active_hostname = primary_hostname;
4980 if (raw_active_hostname != NULL)
4982 uschar *nah = expand_string(raw_active_hostname);
4985 if (!expand_string_forcedfail)
4986 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4987 "(smtp_active_hostname): %s", raw_active_hostname,
4988 expand_string_message);
4990 else if (nah[0] != 0) smtp_active_hostname = nah;
4993 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4994 given IP address so that the blocking and relay configuration can be tested.
4995 Unless a sender_ident was set by -oMt, we discard it (the default is the
4996 caller's login name). An RFC 1413 call is made only if we are running in the
4997 test harness and an incoming interface and both ports are specified, because
4998 there is no TCP/IP call to find the ident for. */
5005 if (!sender_ident_set)
5007 sender_ident = NULL;
5008 if (running_in_test_harness && sender_host_port != 0 &&
5009 interface_address != NULL && interface_port != 0)
5010 verify_get_ident(1413);
5013 /* In case the given address is a non-canonical IPv6 address, canonicize
5014 it. The code works for both IPv4 and IPv6, as it happens. */
5016 size = host_aton(sender_host_address, x);
5017 sender_host_address = store_get(48); /* large enough for full IPv6 */
5018 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5020 /* Now set up for testing */
5022 host_build_sender_fullhost();
5026 sender_local = FALSE;
5027 sender_host_notsocket = TRUE;
5028 debug_file = stderr;
5029 debug_fd = fileno(debug_file);
5030 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5031 "**** but without any ident (RFC 1413) callback.\n"
5032 "**** This is not for real!\n\n",
5033 sender_host_address);
5035 if (verify_check_host(&hosts_connection_nolog) == OK)
5036 log_write_selector &= ~L_smtp_connection;
5037 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5039 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5040 because a log line has already been written for all its failure exists
5041 (usually "connection refused: <reason>") and writing another one is
5042 unnecessary clutter. */
5044 if (smtp_start_session())
5046 reset_point = store_get(0);
5049 store_reset(reset_point);
5050 if (smtp_setup_msg() <= 0) break;
5051 if (!receive_msg(FALSE)) break;
5055 exim_exit(EXIT_SUCCESS);
5059 /* Arrange for message reception if recipients or SMTP were specified;
5060 otherwise complain unless a version print (-bV) happened or this is a filter
5061 verification test or info dump.
5062 In the former case, show the configuration file name. */
5064 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5066 if (version_printed)
5068 printf("Configuration file is %s\n", config_main_filename);
5069 return EXIT_SUCCESS;
5072 if (info_flag != CMDINFO_NONE)
5074 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5075 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5078 if (filter_test == FTEST_NONE)
5079 exim_usage(called_as);
5083 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5084 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5085 that we are not called from inetd, because that is rejected above. The
5086 following configuration settings are forced here:
5088 (1) Synchronous delivery (-odi)
5089 (2) Errors to stderr (-oep == -oeq)
5090 (3) No parallel remote delivery
5091 (4) Unprivileged delivery
5093 We don't force overall queueing options because there are several of them;
5094 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5095 to override any SMTP queueing. */
5099 synchronous_delivery = TRUE;
5100 arg_error_handling = ERRORS_STDERR;
5101 remote_max_parallel = 1;
5102 deliver_drop_privilege = TRUE;
5104 queue_smtp_domains = NULL;
5105 #ifdef EXPERIMENTAL_INTERNATIONAL
5106 message_utf8_downconvert = -1; /* convert-if-needed */
5111 /* Prepare to accept one or more new messages on the standard input. When a
5112 message has been read, its id is returned in message_id[]. If doing immediate
5113 delivery, we fork a delivery process for each received message, except for the
5114 last one, where we can save a process switch.
5116 It is only in non-smtp mode that error_handling is allowed to be changed from
5117 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5118 sendmail error modes other than -oem ever actually used? Later: yes.) */
5120 if (!smtp_input) error_handling = arg_error_handling;
5122 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5123 logging being sent down the socket and make an identd call to get the
5128 (void)fclose(stderr);
5129 exim_nullstd(); /* Re-open to /dev/null */
5130 verify_get_ident(IDENT_PORT);
5131 host_build_sender_fullhost();
5132 set_process_info("handling incoming connection from %s via inetd",
5136 /* If the sender host address has been set, build sender_fullhost if it hasn't
5137 already been done (which it will have been for inetd). This caters for the
5138 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5139 so that the test for IP options is skipped for -bs input. */
5141 if (sender_host_address != NULL && sender_fullhost == NULL)
5143 host_build_sender_fullhost();
5144 set_process_info("handling incoming connection from %s via -oMa",
5146 sender_host_notsocket = TRUE;
5149 /* Otherwise, set the sender host as unknown except for inetd calls. This
5150 prevents host checking in the case of -bs not from inetd and also for -bS. */
5152 else if (!is_inetd) sender_host_unknown = TRUE;
5154 /* If stdout does not exist, then dup stdin to stdout. This can happen
5155 if exim is started from inetd. In this case fd 0 will be set to the socket,
5156 but fd 1 will not be set. This also happens for passed SMTP channels. */
5158 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5160 /* Set up the incoming protocol name and the state of the program. Root is
5161 allowed to force received protocol via the -oMr option above. If we have come
5162 via inetd, the process info has already been set up. We don't set
5163 received_protocol here for smtp input, as it varies according to
5164 batch/HELO/EHLO/AUTH/TLS. */
5168 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5169 smtp_batched_input? "batched " : "",
5170 (sender_address!= NULL)? sender_address : originator_login);
5174 if (received_protocol == NULL)
5175 received_protocol = string_sprintf("local%s", called_as);
5176 set_process_info("accepting a local non-SMTP message from <%s>",
5180 /* Initialize the session_local_queue-only flag (this will be ignored if
5181 mua_wrapper is set) */
5184 session_local_queue_only = queue_only;
5186 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5187 the spool if so configured. On failure, we must not attempt to send an error
5188 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5189 error code is given.) */
5191 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5193 fprintf(stderr, "exim: insufficient disk space\n");
5194 return EXIT_FAILURE;
5197 /* If this is smtp input of any kind, real or batched, handle the start of the
5200 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5201 because a log line has already been written for all its failure exists
5202 (usually "connection refused: <reason>") and writing another one is
5203 unnecessary clutter. */
5209 if (verify_check_host(&hosts_connection_nolog) == OK)
5210 log_write_selector &= ~L_smtp_connection;
5211 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5212 if (!smtp_start_session())
5215 exim_exit(EXIT_SUCCESS);
5219 /* Otherwise, set up the input size limit here. */
5223 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5224 if (expand_string_message != NULL)
5226 if (thismessage_size_limit == -1)
5227 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5228 "message_size_limit: %s", expand_string_message);
5230 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5231 "message_size_limit: %s", expand_string_message);
5235 /* Loop for several messages when reading SMTP input. If we fork any child
5236 processes, we don't want to wait for them unless synchronous delivery is
5237 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5238 same as SIG_DFL, despite the fact that documentation often lists the default as
5239 "ignore". This is a confusing area. This is what I know:
5241 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5242 processes that complete simply to go away without ever becoming defunct. You
5243 can't then wait for them - but we don't want to wait for them in the
5244 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5245 happen for all OS (e.g. *BSD is different).
5247 But that's not the end of the story. Some (many? all?) systems have the
5248 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5249 has by default, so it seems that the difference is merely one of default
5250 (compare restarting vs non-restarting signals).
5252 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5253 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5254 of the loop below. Paranoia rules.
5256 February 2003: That's *still* not the end of the story. There are now versions
5257 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5258 process then calls waitpid(), a grumble is written to the system log, because
5259 this is logically inconsistent. In other words, it doesn't like the paranoia.
5260 As a consequenc of this, the waitpid() below is now excluded if we are sure
5261 that SIG_IGN works. */
5263 if (!synchronous_delivery)
5266 struct sigaction act;
5267 act.sa_handler = SIG_IGN;
5268 sigemptyset(&(act.sa_mask));
5269 act.sa_flags = SA_NOCLDWAIT;
5270 sigaction(SIGCHLD, &act, NULL);
5272 signal(SIGCHLD, SIG_IGN);
5276 /* Save the current store pool point, for resetting at the start of
5277 each message, and save the real sender address, if any. */
5279 reset_point = store_get(0);
5280 real_sender_address = sender_address;
5282 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5283 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5288 store_reset(reset_point);
5291 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5292 input and build the recipients list, before calling receive_msg() to read the
5293 message proper. Whatever sender address is given in the SMTP transaction is
5294 often ignored for local senders - we use the actual sender, which is normally
5295 either the underlying user running this process or a -f argument provided by
5296 a trusted caller. It is saved in real_sender_address. The test for whether to
5297 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5302 if ((rc = smtp_setup_msg()) > 0)
5304 if (real_sender_address != NULL &&
5305 !receive_check_set_sender(sender_address))
5307 sender_address = raw_sender = real_sender_address;
5308 sender_address_unrewritten = NULL;
5311 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5312 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5313 the very end. The result of the ACL is ignored (as for other non-SMTP
5314 messages). It is run for its potential side effects. */
5316 if (smtp_batched_input && acl_not_smtp_start != NULL)
5318 uschar *user_msg, *log_msg;
5319 enable_dollar_recipients = TRUE;
5320 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5321 &user_msg, &log_msg);
5322 enable_dollar_recipients = FALSE;
5325 /* Now get the data for the message */
5327 more = receive_msg(extract_recipients);
5328 if (message_id[0] == 0)
5331 smtp_log_no_mail(); /* Log no mail if configured */
5332 exim_exit(EXIT_FAILURE);
5337 smtp_log_no_mail(); /* Log no mail if configured */
5338 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5342 /* In the non-SMTP case, we have all the information from the command
5343 line, but must process it in case it is in the more general RFC822
5344 format, and in any case, to detect syntax errors. Also, it appears that
5345 the use of comma-separated lists as single arguments is common, so we
5346 had better support them. */
5352 int count = argc - recipients_arg;
5353 uschar **list = argv + recipients_arg;
5355 /* These options cannot be changed dynamically for non-SMTP messages */
5357 active_local_sender_retain = local_sender_retain;
5358 active_local_from_check = local_from_check;
5360 /* Save before any rewriting */
5362 raw_sender = string_copy(sender_address);
5364 /* Loop for each argument */
5366 for (i = 0; i < count; i++)
5368 int start, end, domain;
5370 uschar *s = list[i];
5372 /* Loop for each comma-separated address */
5376 BOOL finished = FALSE;
5378 uschar *ss = parse_find_address_end(s, FALSE);
5380 if (*ss == ',') *ss = 0; else finished = TRUE;
5382 /* Check max recipients - if -t was used, these aren't recipients */
5384 if (recipients_max > 0 && ++rcount > recipients_max &&
5385 !extract_recipients)
5386 if (error_handling == ERRORS_STDERR)
5388 fprintf(stderr, "exim: too many recipients\n");
5389 exim_exit(EXIT_FAILURE);
5394 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5395 errors_sender_rc : EXIT_FAILURE;
5398 #ifdef EXPERIMENTAL_INTERNATIONAL
5400 BOOL b = allow_utf8_domains;
5401 allow_utf8_domains = TRUE;
5404 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5406 #ifdef EXPERIMENTAL_INTERNATIONAL
5407 if (string_is_utf8(recipient))
5408 message_smtputf8 = TRUE;
5410 allow_utf8_domains = b;
5413 if (domain == 0 && !allow_unqualified_recipient)
5416 errmess = US"unqualified recipient address not allowed";
5419 if (recipient == NULL)
5421 if (error_handling == ERRORS_STDERR)
5423 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5424 string_printing(list[i]), errmess);
5425 exim_exit(EXIT_FAILURE);
5431 eblock.text1 = string_printing(list[i]);
5432 eblock.text2 = errmess;
5434 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5435 errors_sender_rc : EXIT_FAILURE;
5439 receive_add_recipient(recipient, -1);
5442 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5446 /* Show the recipients when debugging */
5451 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5452 if (recipients_list != NULL)
5454 debug_printf("Recipients:\n");
5455 for (i = 0; i < recipients_count; i++)
5456 debug_printf(" %s\n", recipients_list[i].address);
5460 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5461 ignored; rejecting here would just add complication, and it can just as
5462 well be done later. Allow $recipients to be visible in the ACL. */
5464 if (acl_not_smtp_start != NULL)
5466 uschar *user_msg, *log_msg;
5467 enable_dollar_recipients = TRUE;
5468 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5469 &user_msg, &log_msg);
5470 enable_dollar_recipients = FALSE;
5473 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5474 will just read the headers for the message, and not write anything onto the
5477 message_ended = END_NOTENDED;
5478 more = receive_msg(extract_recipients);
5480 /* more is always FALSE here (not SMTP message) when reading a message
5481 for real; when reading the headers of a message for filter testing,
5482 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5484 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5485 } /* Non-SMTP message reception */
5487 /* If this is a filter testing run, there are headers in store, but
5488 no message on the spool. Run the filtering code in testing mode, setting
5489 the domain to the qualify domain and the local part to the current user,
5490 unless they have been set by options. The prefix and suffix are left unset
5491 unless specified. The the return path is set to to the sender unless it has
5492 already been set from a return-path header in the message. */
5494 if (filter_test != FTEST_NONE)
5496 deliver_domain = (ftest_domain != NULL)?
5497 ftest_domain : qualify_domain_recipient;
5498 deliver_domain_orig = deliver_domain;
5499 deliver_localpart = (ftest_localpart != NULL)?
5500 ftest_localpart : originator_login;
5501 deliver_localpart_orig = deliver_localpart;
5502 deliver_localpart_prefix = ftest_prefix;
5503 deliver_localpart_suffix = ftest_suffix;
5504 deliver_home = originator_home;
5506 if (return_path == NULL)
5508 printf("Return-path copied from sender\n");
5509 return_path = string_copy(sender_address);
5512 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5513 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5515 receive_add_recipient(
5516 string_sprintf("%s%s%s@%s",
5517 (ftest_prefix == NULL)? US"" : ftest_prefix,
5519 (ftest_suffix == NULL)? US"" : ftest_suffix,
5520 deliver_domain), -1);
5522 printf("Recipient = %s\n", recipients_list[0].address);
5523 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5524 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5526 if (chdir("/")) /* Get away from wherever the user is running this from */
5528 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5529 exim_exit(EXIT_FAILURE);
5532 /* Now we run either a system filter test, or a user filter test, or both.
5533 In the latter case, headers added by the system filter will persist and be
5534 available to the user filter. We need to copy the filter variables
5537 if ((filter_test & FTEST_SYSTEM) != 0)
5539 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5540 exim_exit(EXIT_FAILURE);
5543 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5545 if ((filter_test & FTEST_USER) != 0)
5547 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5548 exim_exit(EXIT_FAILURE);
5551 exim_exit(EXIT_SUCCESS);
5554 /* Else act on the result of message reception. We should not get here unless
5555 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5556 will be TRUE. If it is not, check on the number of messages received in this
5559 if (!session_local_queue_only &&
5560 smtp_accept_queue_per_connection > 0 &&
5561 receive_messagecount > smtp_accept_queue_per_connection)
5563 session_local_queue_only = TRUE;
5564 queue_only_reason = 2;
5567 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5568 and queue_only_load is set, check that the load average is below it. If it is
5569 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5570 default), we put the whole session into queue_only mode. It then remains this
5571 way for any subsequent messages on the same SMTP connection. This is a
5572 deliberate choice; even though the load average may fall, it doesn't seem
5573 right to deliver later messages on the same call when not delivering earlier
5574 ones. However, there are odd cases where this is not wanted, so this can be
5575 changed by setting queue_only_load_latch false. */
5577 local_queue_only = session_local_queue_only;
5578 if (!local_queue_only && queue_only_load >= 0)
5580 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5581 if (local_queue_only)
5583 queue_only_reason = 3;
5584 if (queue_only_load_latch) session_local_queue_only = TRUE;
5588 /* If running as an MUA wrapper, all queueing options and freezing options
5592 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5594 /* Log the queueing here, when it will get a message id attached, but
5595 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5598 if (local_queue_only) switch(queue_only_reason)
5601 log_write(L_delay_delivery,
5602 LOG_MAIN, "no immediate delivery: more than %d messages "
5603 "received in one connection", smtp_accept_queue_per_connection);
5607 log_write(L_delay_delivery,
5608 LOG_MAIN, "no immediate delivery: load average %.2f",
5609 (double)load_average/1000.0);
5613 /* Else do the delivery unless the ACL or local_scan() called for queue only
5614 or froze the message. Always deliver in a separate process. A fork failure is
5615 not a disaster, as the delivery will eventually happen on a subsequent queue
5616 run. The search cache must be tidied before the fork, as the parent will
5617 do it before exiting. The child will trigger a lookup failure and
5618 thereby defer the delivery if it tries to use (for example) a cached ldap
5619 connection that the parent has called unbind on. */
5621 else if (!queue_only_policy && !deliver_freeze)
5626 if ((pid = fork()) == 0)
5629 close_unwanted(); /* Close unwanted file descriptors and TLS */
5630 exim_nullstd(); /* Ensure std{in,out,err} exist */
5632 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5633 mode, deliver_drop_privilege is forced TRUE). */
5635 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5637 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5639 /* Control does not return here. */
5642 /* No need to re-exec */
5644 rc = deliver_message(message_id, FALSE, FALSE);
5646 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5647 EXIT_SUCCESS : EXIT_FAILURE);
5652 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5653 "process: %s", strerror(errno));
5656 /* In the parent, wait if synchronous delivery is required. This will
5657 always be the case in MUA wrapper mode. */
5659 else if (synchronous_delivery)
5662 while (wait(&status) != pid);
5663 if ((status & 0x00ff) != 0)
5664 log_write(0, LOG_MAIN|LOG_PANIC,
5665 "process %d crashed with signal %d while delivering %s",
5666 (int)pid, status & 0x00ff, message_id);
5667 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5671 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5672 automatically reaps children (see comments above the loop), clear away any
5673 finished subprocesses here, in case there are lots of messages coming in
5674 from the same source. */
5676 #ifndef SIG_IGN_WORKS
5677 while (waitpid(-1, NULL, WNOHANG) > 0);
5681 exim_exit(EXIT_SUCCESS); /* Never returns */
5682 return 0; /* To stop compiler warning */