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 (void)write(fd, process_info, process_info_len);
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");
817 #ifdef WITH_OLD_DEMIME
818 fprintf(f, " Old_Demime");
823 #ifndef DISABLE_DNSSEC
824 fprintf(f, " DNSSEC");
826 #ifndef DISABLE_EVENT
827 fprintf(f, " Event");
839 fprintf(f, " PROXY");
842 fprintf(f, " SOCKS");
844 #ifdef EXPERIMENTAL_SPF
845 fprintf(f, " Experimental_SPF");
847 #ifdef EXPERIMENTAL_SRS
848 fprintf(f, " Experimental_SRS");
850 #ifdef EXPERIMENTAL_BRIGHTMAIL
851 fprintf(f, " Experimental_Brightmail");
853 #ifdef EXPERIMENTAL_DANE
854 fprintf(f, " Experimental_DANE");
856 #ifdef EXPERIMENTAL_DCC
857 fprintf(f, " Experimental_DCC");
859 #ifdef EXPERIMENTAL_DMARC
860 fprintf(f, " Experimental_DMARC");
862 #ifdef EXPERIMENTAL_DSN_INFO
863 fprintf(f, " Experimental_DSN_info");
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_REDIS) && LOOKUP_REDIS!=2
908 fprintf(f, " redis");
910 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
911 fprintf(f, " sqlite");
913 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
914 fprintf(f, " testdb");
916 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
917 fprintf(f, " whoson");
921 fprintf(f, "Authenticators:");
923 fprintf(f, " cram_md5");
925 #ifdef AUTH_CYRUS_SASL
926 fprintf(f, " cyrus_sasl");
929 fprintf(f, " dovecot");
932 fprintf(f, " gsasl");
934 #ifdef AUTH_HEIMDAL_GSSAPI
935 fprintf(f, " heimdal_gssapi");
937 #ifdef AUTH_PLAINTEXT
938 fprintf(f, " plaintext");
948 fprintf(f, "Routers:");
950 fprintf(f, " accept");
952 #ifdef ROUTER_DNSLOOKUP
953 fprintf(f, " dnslookup");
955 #ifdef ROUTER_IPLITERAL
956 fprintf(f, " ipliteral");
958 #ifdef ROUTER_IPLOOKUP
959 fprintf(f, " iplookup");
961 #ifdef ROUTER_MANUALROUTE
962 fprintf(f, " manualroute");
964 #ifdef ROUTER_QUERYPROGRAM
965 fprintf(f, " queryprogram");
967 #ifdef ROUTER_REDIRECT
968 fprintf(f, " redirect");
972 fprintf(f, "Transports:");
973 #ifdef TRANSPORT_APPENDFILE
974 fprintf(f, " appendfile");
975 #ifdef SUPPORT_MAILDIR
976 fprintf(f, "/maildir");
978 #ifdef SUPPORT_MAILSTORE
979 fprintf(f, "/mailstore");
985 #ifdef TRANSPORT_AUTOREPLY
986 fprintf(f, " autoreply");
988 #ifdef TRANSPORT_LMTP
991 #ifdef TRANSPORT_PIPE
994 #ifdef TRANSPORT_SMTP
999 if (fixed_never_users[0] > 0)
1002 fprintf(f, "Fixed never_users: ");
1003 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1004 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1005 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1008 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1010 /* Everything else is details which are only worth reporting when debugging.
1011 Perhaps the tls_version_report should move into this too. */
1016 /* clang defines __GNUC__ (at least, for me) so test for it first */
1017 #if defined(__clang__)
1018 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1019 #elif defined(__GNUC__)
1020 fprintf(f, "Compiler: GCC [%s]\n",
1024 "? unknown version ?"
1028 fprintf(f, "Compiler: <unknown>\n");
1032 tls_version_report(f);
1035 utf8_version_report(f);
1038 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1039 if (authi->version_report)
1040 (*authi->version_report)(f);
1042 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1043 characters; unless it's an ancient version of PCRE in which case it
1045 #ifndef PCRE_PRERELEASE
1046 #define PCRE_PRERELEASE
1049 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1050 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1052 PCRE_MAJOR, PCRE_MINOR,
1053 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1056 #undef EXPAND_AND_QUOTE
1059 for (i = 0; i < lookup_list_count; i++)
1060 if (lookup_list[i]->version_report)
1061 lookup_list[i]->version_report(f);
1063 #ifdef WHITELIST_D_MACROS
1064 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1066 fprintf(f, "WHITELIST_D_MACROS unset\n");
1068 #ifdef TRUSTED_CONFIG_LIST
1069 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1071 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1078 /*************************************************
1079 * Show auxiliary information about Exim *
1080 *************************************************/
1083 show_exim_information(enum commandline_info request, FILE *stream)
1090 fprintf(stream, "Oops, something went wrong.\n");
1094 "The -bI: flag takes a string indicating which information to provide.\n"
1095 "If the string is not recognised, you'll get this help (on stderr).\n"
1097 " exim -bI:help this information\n"
1098 " exim -bI:dscp dscp value keywords known\n"
1099 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1103 for (pp = exim_sieve_extension_list; *pp; ++pp)
1104 fprintf(stream, "%s\n", *pp);
1107 dscp_list_to_stream(stream);
1113 /*************************************************
1114 * Quote a local part *
1115 *************************************************/
1117 /* This function is used when a sender address or a From: or Sender: header
1118 line is being created from the caller's login, or from an authenticated_id. It
1119 applies appropriate quoting rules for a local part.
1121 Argument: the local part
1122 Returns: the local part, quoted if necessary
1126 local_part_quote(uschar *lpart)
1128 BOOL needs_quote = FALSE;
1133 for (t = lpart; !needs_quote && *t != 0; t++)
1135 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1136 (*t != '.' || t == lpart || t[1] == 0);
1139 if (!needs_quote) return lpart;
1142 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1146 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1149 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1152 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1153 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1154 yield = string_cat(yield, &size, &ptr, nq, 1);
1158 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1166 /*************************************************
1167 * Load readline() functions *
1168 *************************************************/
1170 /* This function is called from testing executions that read data from stdin,
1171 but only when running as the calling user. Currently, only -be does this. The
1172 function loads the readline() function library and passes back the functions.
1173 On some systems, it needs the curses library, so load that too, but try without
1174 it if loading fails. All this functionality has to be requested at build time.
1177 fn_readline_ptr pointer to where to put the readline pointer
1178 fn_addhist_ptr pointer to where to put the addhistory function
1180 Returns: the dlopen handle or NULL on failure
1184 set_readline(char * (**fn_readline_ptr)(const char *),
1185 void (**fn_addhist_ptr)(const char *))
1188 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1190 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1191 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1193 if (dlhandle != NULL)
1195 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1196 * char * readline (const char *prompt);
1197 * void add_history (const char *string);
1199 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1200 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1204 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1213 /*************************************************
1214 * Get a line from stdin for testing things *
1215 *************************************************/
1217 /* This function is called when running tests that can take a number of lines
1218 of input (for example, -be and -bt). It handles continuations and trailing
1219 spaces. And prompting and a blank line output on eof. If readline() is in use,
1220 the arguments are non-NULL and provide the relevant functions.
1223 fn_readline readline function or NULL
1224 fn_addhist addhist function or NULL
1226 Returns: pointer to dynamic memory, or NULL at end of file
1230 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1235 uschar *yield = NULL;
1237 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1241 uschar buffer[1024];
1245 char *readline_line = NULL;
1246 if (fn_readline != NULL)
1248 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1249 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1250 p = US readline_line;
1255 /* readline() not in use */
1258 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1262 /* Handle the line */
1264 ss = p + (int)Ustrlen(p);
1265 while (ss > p && isspace(ss[-1])) ss--;
1269 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1272 yield = string_cat(yield, &size, &ptr, p, ss - p);
1275 if (fn_readline != NULL) free(readline_line);
1278 if (ss == p || yield[ptr-1] != '\\')
1286 if (yield == NULL) printf("\n");
1292 /*************************************************
1293 * Output usage information for the program *
1294 *************************************************/
1296 /* This function is called when there are no recipients
1297 or a specific --help argument was added.
1300 progname information on what name we were called by
1302 Returns: DOES NOT RETURN
1306 exim_usage(uschar *progname)
1309 /* Handle specific program invocation varients */
1310 if (Ustrcmp(progname, US"-mailq") == 0)
1313 "mailq - list the contents of the mail queue\n\n"
1314 "For a list of options, see the Exim documentation.\n");
1318 /* Generic usage - we output this whatever happens */
1320 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1321 "not directly from a shell command line. Options and/or arguments control\n"
1322 "what it does when called. For a list of options, see the Exim documentation.\n");
1329 /*************************************************
1330 * Validate that the macros given are okay *
1331 *************************************************/
1333 /* Typically, Exim will drop privileges if macros are supplied. In some
1334 cases, we want to not do so.
1336 Arguments: none (macros is a global)
1337 Returns: true if trusted, false otherwise
1341 macros_trusted(void)
1343 #ifdef WHITELIST_D_MACROS
1345 uschar *whitelisted, *end, *p, **whites, **w;
1346 int white_count, i, n;
1348 BOOL prev_char_item, found;
1353 #ifndef WHITELIST_D_MACROS
1357 /* We only trust -D overrides for some invoking users:
1358 root, the exim run-time user, the optional config owner user.
1359 I don't know why config-owner would be needed, but since they can own the
1360 config files anyway, there's no security risk to letting them override -D. */
1361 if ( ! ((real_uid == root_uid)
1362 || (real_uid == exim_uid)
1363 #ifdef CONFIGURE_OWNER
1364 || (real_uid == config_uid)
1368 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1372 /* Get a list of macros which are whitelisted */
1373 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1374 prev_char_item = FALSE;
1376 for (p = whitelisted; *p != '\0'; ++p)
1378 if (*p == ':' || isspace(*p))
1383 prev_char_item = FALSE;
1386 if (!prev_char_item)
1387 prev_char_item = TRUE;
1394 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1395 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1400 if (i == white_count)
1402 while (*p != '\0' && p < end)
1408 /* The list of macros should be very short. Accept the N*M complexity. */
1409 for (m = macros; m != NULL; m = m->next)
1412 for (w = whites; *w; ++w)
1413 if (Ustrcmp(*w, m->name) == 0)
1420 if (m->replacement == NULL)
1422 len = Ustrlen(m->replacement);
1425 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1426 0, PCRE_EOPT, NULL, 0);
1429 if (n != PCRE_ERROR_NOMATCH)
1430 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1434 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1440 /*************************************************
1441 * Entry point and high-level code *
1442 *************************************************/
1444 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1445 the appropriate action. All the necessary functions are present in the one
1446 binary. I originally thought one should split it up, but it turns out that so
1447 much of the apparatus is needed in each chunk that one might as well just have
1448 it all available all the time, which then makes the coding easier as well.
1451 argc count of entries in argv
1452 argv argument strings, with argv[0] being the program name
1454 Returns: EXIT_SUCCESS if terminated successfully
1455 EXIT_FAILURE otherwise, except when a message has been sent
1456 to the sender, and -oee was given
1460 main(int argc, char **cargv)
1462 uschar **argv = USS cargv;
1463 int arg_receive_timeout = -1;
1464 int arg_smtp_receive_timeout = -1;
1465 int arg_error_handling = error_handling;
1466 int filter_sfd = -1;
1467 int filter_ufd = -1;
1470 int list_queue_option = 0;
1472 int msg_action_arg = -1;
1473 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1474 int queue_only_reason = 0;
1476 int perl_start_option = 0;
1478 int recipients_arg = argc;
1479 int sender_address_domain = 0;
1480 int test_retry_arg = -1;
1481 int test_rewrite_arg = -1;
1482 BOOL arg_queue_only = FALSE;
1483 BOOL bi_option = FALSE;
1484 BOOL checking = FALSE;
1485 BOOL count_queue = FALSE;
1486 BOOL expansion_test = FALSE;
1487 BOOL extract_recipients = FALSE;
1488 BOOL flag_G = FALSE;
1489 BOOL flag_n = FALSE;
1490 BOOL forced_delivery = FALSE;
1491 BOOL f_end_dot = FALSE;
1492 BOOL deliver_give_up = FALSE;
1493 BOOL list_queue = FALSE;
1494 BOOL list_options = FALSE;
1495 BOOL list_config = FALSE;
1496 BOOL local_queue_only;
1498 BOOL one_msg_action = FALSE;
1499 BOOL queue_only_set = FALSE;
1500 BOOL receiving_message = TRUE;
1501 BOOL sender_ident_set = FALSE;
1502 BOOL session_local_queue_only;
1504 BOOL removed_privilege = FALSE;
1505 BOOL usage_wanted = FALSE;
1506 BOOL verify_address_mode = FALSE;
1507 BOOL verify_as_sender = FALSE;
1508 BOOL version_printed = FALSE;
1509 uschar *alias_arg = NULL;
1510 uschar *called_as = US"";
1511 uschar *cmdline_syslog_name = NULL;
1512 uschar *start_queue_run_id = NULL;
1513 uschar *stop_queue_run_id = NULL;
1514 uschar *expansion_test_message = NULL;
1515 uschar *ftest_domain = NULL;
1516 uschar *ftest_localpart = NULL;
1517 uschar *ftest_prefix = NULL;
1518 uschar *ftest_suffix = NULL;
1519 uschar *log_oneline = NULL;
1520 uschar *malware_test_file = NULL;
1521 uschar *real_sender_address;
1522 uschar *originator_home = US"/";
1527 struct stat statbuf;
1528 pid_t passed_qr_pid = (pid_t)0;
1529 int passed_qr_pipe = -1;
1530 gid_t group_list[NGROUPS_MAX];
1532 /* For the -bI: flag */
1533 enum commandline_info info_flag = CMDINFO_NONE;
1534 BOOL info_stdout = FALSE;
1536 /* Possible options for -R and -S */
1538 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1540 /* Need to define this in case we need to change the environment in order
1541 to get rid of a bogus time zone. We have to make it char rather than uschar
1542 because some OS define it in /usr/include/unistd.h. */
1544 extern char **environ;
1546 /* If the Exim user and/or group and/or the configuration file owner/group were
1547 defined by ref:name at build time, we must now find the actual uid/gid values.
1548 This is a feature to make the lives of binary distributors easier. */
1550 #ifdef EXIM_USERNAME
1551 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1555 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1559 /* If ref:name uses a number as the name, route_finduser() returns
1560 TRUE with exim_uid set and pw coerced to NULL. */
1562 exim_gid = pw->pw_gid;
1563 #ifndef EXIM_GROUPNAME
1567 "exim: ref:name should specify a usercode, not a group.\n"
1568 "exim: can't let you get away with it unless you also specify a group.\n");
1575 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1581 #ifdef EXIM_GROUPNAME
1582 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1584 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1590 #ifdef CONFIGURE_OWNERNAME
1591 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1593 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1594 CONFIGURE_OWNERNAME);
1599 /* We default the system_filter_user to be the Exim run-time user, as a
1600 sane non-root value. */
1601 system_filter_uid = exim_uid;
1603 #ifdef CONFIGURE_GROUPNAME
1604 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1606 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1607 CONFIGURE_GROUPNAME);
1612 /* In the Cygwin environment, some initialization used to need doing.
1613 It was fudged in by means of this macro; now no longer but we'll leave
1614 it in case of others. */
1620 /* Check a field which is patched when we are running Exim within its
1621 testing harness; do a fast initial check, and then the whole thing. */
1623 running_in_test_harness =
1624 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1626 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1627 at the start of a program; however, it seems that some environments do not
1628 follow this. A "strange" locale can affect the formatting of timestamps, so we
1631 setlocale(LC_ALL, "C");
1633 /* Set up the default handler for timing using alarm(). */
1635 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1637 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1638 because store_malloc writes a log entry on failure. */
1640 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1641 if (log_buffer == NULL)
1643 fprintf(stderr, "exim: failed to get store for log buffer\n");
1647 /* Initialize the default log options. */
1649 bits_set(log_selector, log_selector_size, log_default);
1651 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1652 NULL when the daemon is run and the file is closed. We have to use this
1653 indirection, because some systems don't allow writing to the variable "stderr".
1656 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1658 /* Arrange for the PCRE regex library to use our store functions. Note that
1659 the normal calls are actually macros that add additional arguments for
1660 debugging purposes so we have to assign specially constructed functions here.
1661 The default is to use store in the stacking pool, but this is overridden in the
1662 regex_must_compile() function. */
1664 pcre_malloc = function_store_get;
1665 pcre_free = function_dummy_free;
1667 /* Ensure there is a big buffer for temporary use in several places. It is put
1668 in malloc store so that it can be freed for enlargement if necessary. */
1670 big_buffer = store_malloc(big_buffer_size);
1672 /* Set up the handler for the data request signal, and set the initial
1673 descriptive text. */
1675 set_process_info("initializing");
1676 os_restarting_signal(SIGUSR1, usr1_handler);
1678 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1679 in the daemon code. For the rest of Exim's uses, we ignore it. */
1681 signal(SIGHUP, SIG_IGN);
1683 /* We don't want to die on pipe errors as the code is written to handle
1684 the write error instead. */
1686 signal(SIGPIPE, SIG_IGN);
1688 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1689 set to SIG_IGN. This causes subprocesses that complete before the parent
1690 process waits for them not to hang around, so when Exim calls wait(), nothing
1691 is there. The wait() code has been made robust against this, but let's ensure
1692 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1693 ending status. We use sigaction rather than plain signal() on those OS where
1694 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1695 problem on AIX with this.) */
1699 struct sigaction act;
1700 act.sa_handler = SIG_DFL;
1701 sigemptyset(&(act.sa_mask));
1703 sigaction(SIGCHLD, &act, NULL);
1706 signal(SIGCHLD, SIG_DFL);
1709 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1714 /* Set up the version number. Set up the leading 'E' for the external form of
1715 message ids, set the pointer to the internal form, and initialize it to
1716 indicate no message being processed. */
1719 message_id_option[0] = '-';
1720 message_id_external = message_id_option + 1;
1721 message_id_external[0] = 'E';
1722 message_id = message_id_external + 1;
1725 /* Set the umask to zero so that any files Exim creates using open() are
1726 created with the modes that it specifies. NOTE: Files created with fopen() have
1727 a problem, which was not recognized till rather late (February 2006). With this
1728 umask, such files will be world writeable. (They are all content scanning files
1729 in the spool directory, which isn't world-accessible, so this is not a
1730 disaster, but it's untidy.) I don't want to change this overall setting,
1731 however, because it will interact badly with the open() calls. Instead, there's
1732 now a function called modefopen() that fiddles with the umask while calling
1737 /* Precompile the regular expression for matching a message id. Keep this in
1738 step with the code that generates ids in the accept.c module. We need to do
1739 this here, because the -M options check their arguments for syntactic validity
1740 using mac_ismsgid, which uses this. */
1743 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1745 /* Precompile the regular expression that is used for matching an SMTP error
1746 code, possibly extended, at the start of an error message. Note that the
1747 terminating whitespace character is included. */
1750 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1753 #ifdef WHITELIST_D_MACROS
1754 /* Precompile the regular expression used to filter the content of macros
1755 given to -D for permissibility. */
1757 regex_whitelisted_macro =
1758 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1761 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1763 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1764 this seems to be a generally accepted convention, since one finds symbolic
1765 links called "mailq" in standard OS configurations. */
1767 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1768 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1771 receiving_message = FALSE;
1772 called_as = US"-mailq";
1775 /* If the program is called as "rmail" treat it as equivalent to
1776 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1777 i.e. preventing a single dot on a line from terminating the message, and
1778 returning with zero return code, even in cases of error (provided an error
1779 message has been sent). */
1781 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1782 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1785 called_as = US"-rmail";
1786 errors_sender_rc = EXIT_SUCCESS;
1789 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1790 this is a smail convention. */
1792 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1793 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1795 smtp_input = smtp_batched_input = TRUE;
1796 called_as = US"-rsmtp";
1799 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1800 this is a smail convention. */
1802 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1803 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1806 receiving_message = FALSE;
1807 called_as = US"-runq";
1810 /* If the program is called as "newaliases" treat it as equivalent to
1811 "exim -bi"; this is a sendmail convention. */
1813 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1814 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1817 receiving_message = FALSE;
1818 called_as = US"-newaliases";
1821 /* Save the original effective uid for a couple of uses later. It should
1822 normally be root, but in some esoteric environments it may not be. */
1824 original_euid = geteuid();
1826 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1827 to be the same as the real ones. This makes a difference only if Exim is setuid
1828 (or setgid) to something other than root, which could be the case in some
1829 special configurations. */
1831 real_uid = getuid();
1832 real_gid = getgid();
1834 if (real_uid == root_uid)
1836 rv = setgid(real_gid);
1839 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1840 (long int)real_gid, strerror(errno));
1843 rv = setuid(real_uid);
1846 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1847 (long int)real_uid, strerror(errno));
1852 /* If neither the original real uid nor the original euid was root, Exim is
1853 running in an unprivileged state. */
1855 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1857 /* Scan the program's arguments. Some can be dealt with right away; others are
1858 simply recorded for checking and handling afterwards. Do a high-level switch
1859 on the second character (the one after '-'), to save some effort. */
1861 for (i = 1; i < argc; i++)
1863 BOOL badarg = FALSE;
1864 uschar *arg = argv[i];
1868 /* An argument not starting with '-' is the start of a recipients list;
1869 break out of the options-scanning loop. */
1877 /* An option consistion of -- terminates the options */
1879 if (Ustrcmp(arg, "--") == 0)
1881 recipients_arg = i + 1;
1885 /* Handle flagged options */
1887 switchchar = arg[1];
1890 /* Make all -ex options synonymous with -oex arguments, since that
1891 is assumed by various callers. Also make -qR options synonymous with -R
1892 options, as that seems to be required as well. Allow for -qqR too, and
1893 the same for -S options. */
1895 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1896 Ustrncmp(arg+1, "qR", 2) == 0 ||
1897 Ustrncmp(arg+1, "qS", 2) == 0)
1899 switchchar = arg[2];
1902 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1904 switchchar = arg[3];
1906 queue_2stage = TRUE;
1909 /* Make -r synonymous with -f, since it is a documented alias */
1911 else if (arg[1] == 'r') switchchar = 'f';
1913 /* Make -ov synonymous with -v */
1915 else if (Ustrcmp(arg, "-ov") == 0)
1921 /* deal with --option_aliases */
1922 else if (switchchar == '-')
1924 if (Ustrcmp(argrest, "help") == 0)
1926 usage_wanted = TRUE;
1929 else if (Ustrcmp(argrest, "version") == 0)
1936 /* High-level switch on active initial letter */
1941 /* sendmail uses -Ac and -Am to control which .cf file is used;
1944 if (*argrest == '\0') { badarg = TRUE; break; }
1947 BOOL ignore = FALSE;
1952 if (*(argrest + 1) == '\0')
1956 if (!ignore) { badarg = TRUE; break; }
1960 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1961 so has no need of it. */
1964 if (*argrest == 0) i++; /* Skip over the type */
1969 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1971 /* -bd: Run in daemon mode, awaiting SMTP connections.
1972 -bdf: Ditto, but in the foreground.
1975 if (*argrest == 'd')
1977 daemon_listen = TRUE;
1978 if (*(++argrest) == 'f') background_daemon = FALSE;
1979 else if (*argrest != 0) { badarg = TRUE; break; }
1982 /* -be: Run in expansion test mode
1983 -bem: Ditto, but read a message from a file first
1986 else if (*argrest == 'e')
1988 expansion_test = checking = TRUE;
1989 if (argrest[1] == 'm')
1991 if (++i >= argc) { badarg = TRUE; break; }
1992 expansion_test_message = argv[i];
1995 if (argrest[1] != 0) { badarg = TRUE; break; }
1998 /* -bF: Run system filter test */
2000 else if (*argrest == 'F')
2002 filter_test |= FTEST_SYSTEM;
2003 if (*(++argrest) != 0) { badarg = TRUE; break; }
2004 if (++i < argc) filter_test_sfile = argv[i]; else
2006 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2011 /* -bf: Run user filter test
2012 -bfd: Set domain for filter testing
2013 -bfl: Set local part for filter testing
2014 -bfp: Set prefix for filter testing
2015 -bfs: Set suffix for filter testing
2018 else if (*argrest == 'f')
2020 if (*(++argrest) == 0)
2022 filter_test |= FTEST_USER;
2023 if (++i < argc) filter_test_ufile = argv[i]; else
2025 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2033 fprintf(stderr, "exim: string expected after %s\n", arg);
2036 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2037 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2038 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2039 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2040 else { badarg = TRUE; break; }
2044 /* -bh: Host checking - an IP address must follow. */
2046 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2048 if (++i >= argc) { badarg = TRUE; break; }
2049 sender_host_address = argv[i];
2050 host_checking = checking = log_testing_mode = TRUE;
2051 host_checking_callout = argrest[1] == 'c';
2054 /* -bi: This option is used by sendmail to initialize *the* alias file,
2055 though it has the -oA option to specify a different file. Exim has no
2056 concept of *the* alias file, but since Sun's YP make script calls
2057 sendmail this way, some support must be provided. */
2059 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2061 /* -bI: provide information, of the type to follow after a colon.
2062 This is an Exim flag. */
2064 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2066 uschar *p = &argrest[2];
2067 info_flag = CMDINFO_HELP;
2070 if (strcmpic(p, CUS"sieve") == 0)
2072 info_flag = CMDINFO_SIEVE;
2075 else if (strcmpic(p, CUS"dscp") == 0)
2077 info_flag = CMDINFO_DSCP;
2080 else if (strcmpic(p, CUS"help") == 0)
2087 /* -bm: Accept and deliver message - the default option. Reinstate
2088 receiving_message, which got turned off for all -b options. */
2090 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2092 /* -bmalware: test the filename given for malware */
2094 else if (Ustrcmp(argrest, "malware") == 0)
2096 if (++i >= argc) { badarg = TRUE; break; }
2097 malware_test_file = argv[i];
2100 /* -bnq: For locally originating messages, do not qualify unqualified
2101 addresses. In the envelope, this causes errors; in header lines they
2104 else if (Ustrcmp(argrest, "nq") == 0)
2106 allow_unqualified_sender = FALSE;
2107 allow_unqualified_recipient = FALSE;
2110 /* -bpxx: List the contents of the mail queue, in various forms. If
2111 the option is -bpc, just a queue count is needed. Otherwise, if the
2112 first letter after p is r, then order is random. */
2114 else if (*argrest == 'p')
2116 if (*(++argrest) == 'c')
2119 if (*(++argrest) != 0) badarg = TRUE;
2123 if (*argrest == 'r')
2125 list_queue_option = 8;
2128 else list_queue_option = 0;
2132 /* -bp: List the contents of the mail queue, top-level only */
2134 if (*argrest == 0) {}
2136 /* -bpu: List the contents of the mail queue, top-level undelivered */
2138 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2140 /* -bpa: List the contents of the mail queue, including all delivered */
2142 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2144 /* Unknown after -bp[r] */
2154 /* -bP: List the configuration variables given as the address list.
2155 Force -v, so configuration errors get displayed. */
2157 else if (Ustrcmp(argrest, "P") == 0)
2159 /* -bP config: we need to setup here, because later,
2160 * when list_options is checked, the config is read already */
2161 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2164 readconf_save_config(version_string);
2168 list_options = TRUE;
2169 debug_selector |= D_v;
2170 debug_file = stderr;
2174 /* -brt: Test retry configuration lookup */
2176 else if (Ustrcmp(argrest, "rt") == 0)
2178 test_retry_arg = i + 1;
2182 /* -brw: Test rewrite configuration */
2184 else if (Ustrcmp(argrest, "rw") == 0)
2186 test_rewrite_arg = i + 1;
2190 /* -bS: Read SMTP commands on standard input, but produce no replies -
2191 all errors are reported by sending messages. */
2193 else if (Ustrcmp(argrest, "S") == 0)
2194 smtp_input = smtp_batched_input = receiving_message = TRUE;
2196 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2197 on standard output. */
2199 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2201 /* -bt: address testing mode */
2203 else if (Ustrcmp(argrest, "t") == 0)
2204 address_test_mode = checking = log_testing_mode = TRUE;
2206 /* -bv: verify addresses */
2208 else if (Ustrcmp(argrest, "v") == 0)
2209 verify_address_mode = checking = log_testing_mode = TRUE;
2211 /* -bvs: verify sender addresses */
2213 else if (Ustrcmp(argrest, "vs") == 0)
2215 verify_address_mode = checking = log_testing_mode = TRUE;
2216 verify_as_sender = TRUE;
2219 /* -bV: Print version string and support details */
2221 else if (Ustrcmp(argrest, "V") == 0)
2223 printf("Exim version %s #%s built %s\n", version_string,
2224 version_cnumber, version_date);
2225 printf("%s\n", CS version_copyright);
2226 version_printed = TRUE;
2227 show_whats_supported(stdout);
2230 /* -bw: inetd wait mode, accept a listening socket as stdin */
2232 else if (*argrest == 'w')
2234 inetd_wait_mode = TRUE;
2235 background_daemon = FALSE;
2236 daemon_listen = TRUE;
2237 if (*(++argrest) != '\0')
2239 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2240 if (inetd_wait_timeout <= 0)
2242 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2252 /* -C: change configuration file list; ignore if it isn't really
2253 a change! Enforce a prefix check if required. */
2258 if(++i < argc) argrest = argv[i]; else
2259 { badarg = TRUE; break; }
2261 if (Ustrcmp(config_main_filelist, argrest) != 0)
2263 #ifdef ALT_CONFIG_PREFIX
2265 int len = Ustrlen(ALT_CONFIG_PREFIX);
2266 uschar *list = argrest;
2268 while((filename = string_nextinlist(&list, &sep, big_buffer,
2269 big_buffer_size)) != NULL)
2271 if ((Ustrlen(filename) < len ||
2272 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2273 Ustrstr(filename, "/../") != NULL) &&
2274 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2276 fprintf(stderr, "-C Permission denied\n");
2281 if (real_uid != root_uid)
2283 #ifdef TRUSTED_CONFIG_LIST
2285 if (real_uid != exim_uid
2286 #ifdef CONFIGURE_OWNER
2287 && real_uid != config_uid
2290 trusted_config = FALSE;
2293 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2296 struct stat statbuf;
2298 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2299 (statbuf.st_uid != root_uid /* owner not root */
2300 #ifdef CONFIGURE_OWNER
2301 && statbuf.st_uid != config_uid /* owner not the special one */
2304 (statbuf.st_gid != root_gid /* group not root */
2305 #ifdef CONFIGURE_GROUP
2306 && statbuf.st_gid != config_gid /* group not the special one */
2308 && (statbuf.st_mode & 020) != 0 /* group writeable */
2310 (statbuf.st_mode & 2) != 0) /* world writeable */
2312 trusted_config = FALSE;
2317 /* Well, the trust list at least is up to scratch... */
2318 void *reset_point = store_get(0);
2319 uschar *trusted_configs[32];
2323 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2325 uschar *start = big_buffer, *nl;
2326 while (*start && isspace(*start))
2330 nl = Ustrchr(start, '\n');
2333 trusted_configs[nr_configs++] = string_copy(start);
2334 if (nr_configs == 32)
2342 const uschar *list = argrest;
2344 while (trusted_config && (filename = string_nextinlist(&list,
2345 &sep, big_buffer, big_buffer_size)) != NULL)
2347 for (i=0; i < nr_configs; i++)
2349 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2352 if (i == nr_configs)
2354 trusted_config = FALSE;
2358 store_reset(reset_point);
2362 /* No valid prefixes found in trust_list file. */
2363 trusted_config = FALSE;
2369 /* Could not open trust_list file. */
2370 trusted_config = FALSE;
2374 /* Not root; don't trust config */
2375 trusted_config = FALSE;
2379 config_main_filelist = argrest;
2380 config_changed = TRUE;
2385 /* -D: set up a macro definition */
2388 #ifdef DISABLE_D_OPTION
2389 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2394 macro_item *mlast = NULL;
2397 uschar *s = argrest;
2399 while (isspace(*s)) s++;
2401 if (*s < 'A' || *s > 'Z')
2403 fprintf(stderr, "exim: macro name set by -D must start with "
2404 "an upper case letter\n");
2408 while (isalnum(*s) || *s == '_')
2410 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2414 if (ptr == 0) { badarg = TRUE; break; }
2415 while (isspace(*s)) s++;
2418 if (*s++ != '=') { badarg = TRUE; break; }
2419 while (isspace(*s)) s++;
2422 for (m = macros; m != NULL; m = m->next)
2424 if (Ustrcmp(m->name, name) == 0)
2426 fprintf(stderr, "exim: duplicated -D in command line\n");
2432 m = store_get(sizeof(macro_item) + Ustrlen(name));
2434 m->command_line = TRUE;
2435 if (mlast == NULL) macros = m; else mlast->next = m;
2436 Ustrcpy(m->name, name);
2437 m->replacement = string_copy(s);
2439 if (clmacro_count >= MAX_CLMACROS)
2441 fprintf(stderr, "exim: too many -D options on command line\n");
2444 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2450 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2451 The latter is now a no-op, retained for compatibility only. If -dd is used,
2452 debugging subprocesses of the daemon is disabled. */
2455 if (Ustrcmp(argrest, "ropcr") == 0)
2457 /* drop_cr = TRUE; */
2460 /* Use an intermediate variable so that we don't set debugging while
2461 decoding the debugging bits. */
2465 unsigned int selector = D_default;
2468 if (*argrest == 'd')
2470 debug_daemon = TRUE;
2474 decode_bits(&selector, 1, debug_notall, argrest,
2475 debug_options, debug_options_count, US"debug", 0);
2476 debug_selector = selector;
2481 /* -E: This is a local error message. This option is not intended for
2482 external use at all, but is not restricted to trusted callers because it
2483 does no harm (just suppresses certain error messages) and if Exim is run
2484 not setuid root it won't always be trusted when it generates error
2485 messages using this option. If there is a message id following -E, point
2486 message_reference at it, for logging. */
2489 local_error_message = TRUE;
2490 if (mac_ismsgid(argrest)) message_reference = argrest;
2494 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2495 option, so it looks as if historically the -oex options are also callable
2496 without the leading -o. So we have to accept them. Before the switch,
2497 anything starting -oe has been converted to -e. Exim does not support all
2498 of the sendmail error options. */
2501 if (Ustrcmp(argrest, "e") == 0)
2503 arg_error_handling = ERRORS_SENDER;
2504 errors_sender_rc = EXIT_SUCCESS;
2506 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2507 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2508 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2509 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2514 /* -F: Set sender's full name, used instead of the gecos entry from
2515 the password file. Since users can usually alter their gecos entries,
2516 there's no security involved in using this instead. The data can follow
2517 the -F or be in the next argument. */
2522 if(++i < argc) argrest = argv[i]; else
2523 { badarg = TRUE; break; }
2525 originator_name = argrest;
2526 sender_name_forced = TRUE;
2530 /* -f: Set sender's address - this value is only actually used if Exim is
2531 run by a trusted user, or if untrusted_set_sender is set and matches the
2532 address, except that the null address can always be set by any user. The
2533 test for this happens later, when the value given here is ignored when not
2534 permitted. For an untrusted user, the actual sender is still put in Sender:
2535 if it doesn't match the From: header (unless no_local_from_check is set).
2536 The data can follow the -f or be in the next argument. The -r switch is an
2537 obsolete form of -f but since there appear to be programs out there that
2538 use anything that sendmail has ever supported, better accept it - the
2539 synonymizing is done before the switch above.
2541 At this stage, we must allow domain literal addresses, because we don't
2542 know what the setting of allow_domain_literals is yet. Ditto for trailing
2543 dots and strip_trailing_dot. */
2547 int dummy_start, dummy_end;
2551 if (i+1 < argc) argrest = argv[++i]; else
2552 { badarg = TRUE; break; }
2555 sender_address = string_sprintf(""); /* Ensure writeable memory */
2558 uschar *temp = argrest + Ustrlen(argrest) - 1;
2559 while (temp >= argrest && isspace(*temp)) temp--;
2560 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2561 allow_domain_literals = TRUE;
2562 strip_trailing_dot = TRUE;
2564 allow_utf8_domains = TRUE;
2566 sender_address = parse_extract_address(argrest, &errmess,
2567 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2569 message_smtputf8 = string_is_utf8(sender_address);
2570 allow_utf8_domains = FALSE;
2572 allow_domain_literals = FALSE;
2573 strip_trailing_dot = FALSE;
2574 if (sender_address == NULL)
2576 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2577 return EXIT_FAILURE;
2580 sender_address_forced = TRUE;
2584 /* -G: sendmail invocation to specify that it's a gateway submission and
2585 sendmail may complain about problems instead of fixing them.
2586 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2587 not at this time complain about problems. */
2593 /* -h: Set the hop count for an incoming message. Exim does not currently
2594 support this; it always computes it by counting the Received: headers.
2595 To put it in will require a change to the spool header file format. */
2600 if(++i < argc) argrest = argv[i]; else
2601 { badarg = TRUE; break; }
2603 if (!isdigit(*argrest)) badarg = TRUE;
2607 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2608 not to be documented for sendmail but mailx (at least) uses it) */
2611 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2615 /* -L: set the identifier used for syslog; equivalent to setting
2616 syslog_processname in the config file, but needs to be an admin option. */
2619 if (*argrest == '\0')
2621 if(++i < argc) argrest = argv[i]; else
2622 { badarg = TRUE; break; }
2624 sz = Ustrlen(argrest);
2627 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2628 return EXIT_FAILURE;
2632 fprintf(stderr, "exim: the -L syslog name is too short\n");
2633 return EXIT_FAILURE;
2635 cmdline_syslog_name = argrest;
2639 receiving_message = FALSE;
2641 /* -MC: continue delivery of another message via an existing open
2642 file descriptor. This option is used for an internal call by the
2643 smtp transport when there is a pending message waiting to go to an
2644 address to which it has got a connection. Five subsequent arguments are
2645 required: transport name, host name, IP address, sequence number, and
2646 message_id. Transports may decline to create new processes if the sequence
2647 number gets too big. The channel is stdin. This (-MC) must be the last
2648 argument. There's a subsequent check that the real-uid is privileged.
2650 If we are running in the test harness. delay for a bit, to let the process
2651 that set this one up complete. This makes for repeatability of the logging,
2654 if (Ustrcmp(argrest, "C") == 0)
2656 union sockaddr_46 interface_sock;
2657 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2661 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2662 return EXIT_FAILURE;
2665 if (msg_action_arg >= 0)
2667 fprintf(stderr, "exim: incompatible arguments\n");
2668 return EXIT_FAILURE;
2671 continue_transport = argv[++i];
2672 continue_hostname = argv[++i];
2673 continue_host_address = argv[++i];
2674 continue_sequence = Uatoi(argv[++i]);
2675 msg_action = MSG_DELIVER;
2676 msg_action_arg = ++i;
2677 forced_delivery = TRUE;
2678 queue_run_pid = passed_qr_pid;
2679 queue_run_pipe = passed_qr_pipe;
2681 if (!mac_ismsgid(argv[i]))
2683 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2685 return EXIT_FAILURE;
2688 /* Set up $sending_ip_address and $sending_port */
2690 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2692 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2696 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2698 return EXIT_FAILURE;
2701 if (running_in_test_harness) millisleep(500);
2705 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2706 precedes -MC (see above). The flag indicates that the host to which
2707 Exim is connected has accepted an AUTH sequence. */
2709 else if (Ustrcmp(argrest, "CA") == 0)
2711 smtp_authenticated = TRUE;
2715 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2716 that exim is connected to supports the esmtp extension DSN */
2717 else if (Ustrcmp(argrest, "CD") == 0)
2719 smtp_use_dsn = TRUE;
2723 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2724 it preceded -MC (see above) */
2726 else if (Ustrcmp(argrest, "CP") == 0)
2728 smtp_use_pipelining = TRUE;
2732 /* -MCQ: pass on the pid of the queue-running process that started
2733 this chain of deliveries and the fd of its synchronizing pipe; this
2734 is useful only when it precedes -MC (see above) */
2736 else if (Ustrcmp(argrest, "CQ") == 0)
2738 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2740 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2745 /* -MCS: set the smtp_use_size flag; this is useful only when it
2746 precedes -MC (see above) */
2748 else if (Ustrcmp(argrest, "CS") == 0)
2750 smtp_use_size = TRUE;
2754 /* -MCT: set the tls_offered flag; this is useful only when it
2755 precedes -MC (see above). The flag indicates that the host to which
2756 Exim is connected has offered TLS support. */
2759 else if (Ustrcmp(argrest, "CT") == 0)
2766 /* -M[x]: various operations on the following list of message ids:
2767 -M deliver the messages, ignoring next retry times and thawing
2768 -Mc deliver the messages, checking next retry times, no thawing
2769 -Mf freeze the messages
2770 -Mg give up on the messages
2771 -Mt thaw the messages
2772 -Mrm remove the messages
2773 In the above cases, this must be the last option. There are also the
2774 following options which are followed by a single message id, and which
2775 act on that message. Some of them use the "recipient" addresses as well.
2776 -Mar add recipient(s)
2777 -Mmad mark all recipients delivered
2778 -Mmd mark recipients(s) delivered
2780 -Mset load a message for use with -be
2782 -Mvc show copy (of whole message, in RFC 2822 format)
2787 else if (*argrest == 0)
2789 msg_action = MSG_DELIVER;
2790 forced_delivery = deliver_force_thaw = TRUE;
2792 else if (Ustrcmp(argrest, "ar") == 0)
2794 msg_action = MSG_ADD_RECIPIENT;
2795 one_msg_action = TRUE;
2797 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2798 else if (Ustrcmp(argrest, "es") == 0)
2800 msg_action = MSG_EDIT_SENDER;
2801 one_msg_action = TRUE;
2803 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2804 else if (Ustrcmp(argrest, "g") == 0)
2806 msg_action = MSG_DELIVER;
2807 deliver_give_up = TRUE;
2809 else if (Ustrcmp(argrest, "mad") == 0)
2811 msg_action = MSG_MARK_ALL_DELIVERED;
2813 else if (Ustrcmp(argrest, "md") == 0)
2815 msg_action = MSG_MARK_DELIVERED;
2816 one_msg_action = TRUE;
2818 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2819 else if (Ustrcmp(argrest, "set") == 0)
2821 msg_action = MSG_LOAD;
2822 one_msg_action = TRUE;
2824 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2825 else if (Ustrcmp(argrest, "vb") == 0)
2827 msg_action = MSG_SHOW_BODY;
2828 one_msg_action = TRUE;
2830 else if (Ustrcmp(argrest, "vc") == 0)
2832 msg_action = MSG_SHOW_COPY;
2833 one_msg_action = TRUE;
2835 else if (Ustrcmp(argrest, "vh") == 0)
2837 msg_action = MSG_SHOW_HEADER;
2838 one_msg_action = TRUE;
2840 else if (Ustrcmp(argrest, "vl") == 0)
2842 msg_action = MSG_SHOW_LOG;
2843 one_msg_action = TRUE;
2845 else { badarg = TRUE; break; }
2847 /* All the -Mxx options require at least one message id. */
2849 msg_action_arg = i + 1;
2850 if (msg_action_arg >= argc)
2852 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2853 return EXIT_FAILURE;
2856 /* Some require only message ids to follow */
2858 if (!one_msg_action)
2861 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2863 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2865 return EXIT_FAILURE;
2867 goto END_ARG; /* Remaining args are ids */
2870 /* Others require only one message id, possibly followed by addresses,
2871 which will be handled as normal arguments. */
2875 if (!mac_ismsgid(argv[msg_action_arg]))
2877 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2878 argv[msg_action_arg], arg);
2879 return EXIT_FAILURE;
2886 /* Some programs seem to call the -om option without the leading o;
2887 for sendmail it askes for "me too". Exim always does this. */
2890 if (*argrest != 0) badarg = TRUE;
2894 /* -N: don't do delivery - a debugging option that stops transports doing
2895 their thing. It implies debugging at the D_v level. */
2900 dont_deliver = TRUE;
2901 debug_selector |= D_v;
2902 debug_file = stderr;
2908 /* -n: This means "don't alias" in sendmail, apparently.
2909 For normal invocations, it has no effect.
2910 It may affect some other options. */
2916 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2917 option to the specified value. This form uses long names. We need to handle
2918 -O option=value and -Ooption=value. */
2925 fprintf(stderr, "exim: string expected after -O\n");
2933 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2936 if (*argrest == 'A')
2938 alias_arg = argrest + 1;
2939 if (alias_arg[0] == 0)
2941 if (i+1 < argc) alias_arg = argv[++i]; else
2943 fprintf(stderr, "exim: string expected after -oA\n");
2949 /* -oB: Set a connection message max value for remote deliveries */
2951 else if (*argrest == 'B')
2953 uschar *p = argrest + 1;
2956 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2958 connection_max_messages = 1;
2967 fprintf(stderr, "exim: number expected after -oB\n");
2970 connection_max_messages = Uatoi(p);
2974 /* -odb: background delivery */
2976 else if (Ustrcmp(argrest, "db") == 0)
2978 synchronous_delivery = FALSE;
2979 arg_queue_only = FALSE;
2980 queue_only_set = TRUE;
2983 /* -odf: foreground delivery (smail-compatible option); same effect as
2984 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2987 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2989 synchronous_delivery = TRUE;
2990 arg_queue_only = FALSE;
2991 queue_only_set = TRUE;
2994 /* -odq: queue only */
2996 else if (Ustrcmp(argrest, "dq") == 0)
2998 synchronous_delivery = FALSE;
2999 arg_queue_only = TRUE;
3000 queue_only_set = TRUE;
3003 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3004 but no remote delivery */
3006 else if (Ustrcmp(argrest, "dqs") == 0)
3009 arg_queue_only = FALSE;
3010 queue_only_set = TRUE;
3013 /* -oex: Sendmail error flags. As these are also accepted without the
3014 leading -o prefix, for compatibility with vacation and other callers,
3015 they are handled with -e above. */
3017 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3018 -oitrue: Another sendmail syntax for the same */
3020 else if (Ustrcmp(argrest, "i") == 0 ||
3021 Ustrcmp(argrest, "itrue") == 0)
3024 /* -oM*: Set various characteristics for an incoming message; actually
3025 acted on for trusted callers only. */
3027 else if (*argrest == 'M')
3031 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3035 /* -oMa: Set sender host address */
3037 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3039 /* -oMaa: Set authenticator name */
3041 else if (Ustrcmp(argrest, "Maa") == 0)
3042 sender_host_authenticated = argv[++i];
3044 /* -oMas: setting authenticated sender */
3046 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3048 /* -oMai: setting authenticated id */
3050 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3052 /* -oMi: Set incoming interface address */
3054 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3056 /* -oMm: Message reference */
3058 else if (Ustrcmp(argrest, "Mm") == 0)
3060 if (!mac_ismsgid(argv[i+1]))
3062 fprintf(stderr,"-oMm must be a valid message ID\n");
3065 if (!trusted_config)
3067 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3070 message_reference = argv[++i];
3073 /* -oMr: Received protocol */
3075 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3077 /* -oMs: Set sender host name */
3079 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3081 /* -oMt: Set sender ident */
3083 else if (Ustrcmp(argrest, "Mt") == 0)
3085 sender_ident_set = TRUE;
3086 sender_ident = argv[++i];
3089 /* Else a bad argument */
3098 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3099 seem to call this as -m (undocumented), so that is also accepted (see
3102 else if (Ustrcmp(argrest, "m") == 0) {}
3104 /* -oo: An ancient flag for old-style addresses which still seems to
3105 crop up in some calls (see in SCO). */
3107 else if (Ustrcmp(argrest, "o") == 0) {}
3109 /* -oP <name>: set pid file path for daemon */
3111 else if (Ustrcmp(argrest, "P") == 0)
3112 override_pid_file_path = argv[++i];
3114 /* -or <n>: set timeout for non-SMTP acceptance
3115 -os <n>: set timeout for SMTP acceptance */
3117 else if (*argrest == 'r' || *argrest == 's')
3119 int *tp = (*argrest == 'r')?
3120 &arg_receive_timeout : &arg_smtp_receive_timeout;
3121 if (argrest[1] == 0)
3123 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3125 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3128 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3133 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3135 else if (Ustrcmp(argrest, "X") == 0)
3136 override_local_interfaces = argv[++i];
3138 /* Unknown -o argument */
3144 /* -ps: force Perl startup; -pd force delayed Perl startup */
3148 if (*argrest == 's' && argrest[1] == 0)
3150 perl_start_option = 1;
3153 if (*argrest == 'd' && argrest[1] == 0)
3155 perl_start_option = -1;
3160 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3161 which sets the host protocol and host name */
3165 if (i+1 < argc) argrest = argv[++i]; else
3166 { badarg = TRUE; break; }
3171 uschar *hn = Ustrchr(argrest, ':');
3174 received_protocol = argrest;
3178 received_protocol = string_copyn(argrest, hn - argrest);
3179 sender_host_name = hn + 1;
3186 receiving_message = FALSE;
3187 if (queue_interval >= 0)
3189 fprintf(stderr, "exim: -q specified more than once\n");
3193 /* -qq...: Do queue runs in a 2-stage manner */
3195 if (*argrest == 'q')
3197 queue_2stage = TRUE;
3201 /* -qi...: Do only first (initial) deliveries */
3203 if (*argrest == 'i')
3205 queue_run_first_delivery = TRUE;
3209 /* -qf...: Run the queue, forcing deliveries
3210 -qff..: Ditto, forcing thawing as well */
3212 if (*argrest == 'f')
3214 queue_run_force = TRUE;
3215 if (*(++argrest) == 'f')
3217 deliver_force_thaw = TRUE;
3222 /* -q[f][f]l...: Run the queue only on local deliveries */
3224 if (*argrest == 'l')
3226 queue_run_local = TRUE;
3230 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3231 optionally starting from a given message id. */
3233 if (*argrest == 0 &&
3234 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3237 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3238 start_queue_run_id = argv[++i];
3239 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3240 stop_queue_run_id = argv[++i];
3243 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3244 optionally local only. */
3249 queue_interval = readconf_readtime(argrest, 0, FALSE);
3251 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3252 if (queue_interval <= 0)
3254 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3261 case 'R': /* Synonymous with -qR... */
3262 receiving_message = FALSE;
3264 /* -Rf: As -R (below) but force all deliveries,
3265 -Rff: Ditto, but also thaw all frozen messages,
3266 -Rr: String is regex
3267 -Rrf: Regex and force
3268 -Rrff: Regex and force and thaw
3270 in all cases provided there are no further characters in this
3276 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3278 if (Ustrcmp(argrest, rsopts[i]) == 0)
3280 if (i != 2) queue_run_force = TRUE;
3281 if (i >= 2) deliver_selectstring_regex = TRUE;
3282 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3283 argrest += Ustrlen(rsopts[i]);
3288 /* -R: Set string to match in addresses for forced queue run to
3289 pick out particular messages. */
3293 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3295 fprintf(stderr, "exim: string expected after -R\n");
3299 else deliver_selectstring = argrest;
3303 /* -r: an obsolete synonym for -f (see above) */
3306 /* -S: Like -R but works on sender. */
3308 case 'S': /* Synonymous with -qS... */
3309 receiving_message = FALSE;
3311 /* -Sf: As -S (below) but force all deliveries,
3312 -Sff: Ditto, but also thaw all frozen messages,
3313 -Sr: String is regex
3314 -Srf: Regex and force
3315 -Srff: Regex and force and thaw
3317 in all cases provided there are no further characters in this
3323 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3325 if (Ustrcmp(argrest, rsopts[i]) == 0)
3327 if (i != 2) queue_run_force = TRUE;
3328 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3329 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3330 argrest += Ustrlen(rsopts[i]);
3335 /* -S: Set string to match in addresses for forced queue run to
3336 pick out particular messages. */
3340 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3342 fprintf(stderr, "exim: string expected after -S\n");
3346 else deliver_selectstring_sender = argrest;
3349 /* -Tqt is an option that is exclusively for use by the testing suite.
3350 It is not recognized in other circumstances. It allows for the setting up
3351 of explicit "queue times" so that various warning/retry things can be
3352 tested. Otherwise variability of clock ticks etc. cause problems. */
3355 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3356 fudged_queue_times = argv[++i];
3361 /* -t: Set flag to extract recipients from body of message. */
3364 if (*argrest == 0) extract_recipients = TRUE;
3366 /* -ti: Set flag to extract recipients from body of message, and also
3367 specify that dot does not end the message. */
3369 else if (Ustrcmp(argrest, "i") == 0)
3371 extract_recipients = TRUE;
3375 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3378 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3385 /* -U: This means "initial user submission" in sendmail, apparently. The
3386 doc claims that in future sendmail may refuse syntactically invalid
3387 messages instead of fixing them. For the moment, we just ignore it. */
3393 /* -v: verify things - this is a very low-level debugging */
3398 debug_selector |= D_v;
3399 debug_file = stderr;
3405 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3407 The -x flag tells the sendmail command that mail from a local
3408 mail program has National Language Support (NLS) extended characters
3409 in the body of the mail item. The sendmail command can send mail with
3410 extended NLS characters across networks that normally corrupts these
3413 As Exim is 8-bit clean, it just ignores this flag. */
3416 if (*argrest != 0) badarg = TRUE;
3419 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3420 logs to that file. We swallow the parameter and otherwise ignore it. */
3423 if (*argrest == '\0')
3426 fprintf(stderr, "exim: string expected after -X\n");
3432 if (*argrest == '\0')
3433 if (++i < argc) log_oneline = argv[i]; else
3435 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3440 /* All other initial characters are errors */
3445 } /* End of high-level switch statement */
3447 /* Failed to recognize the option, or syntax error */
3451 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3452 "option %s\n", arg);
3458 /* If -R or -S have been specified without -q, assume a single queue run. */
3460 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3461 queue_interval < 0) queue_interval = 0;
3465 /* If usage_wanted is set we call the usage function - which never returns */
3466 if (usage_wanted) exim_usage(called_as);
3468 /* Arguments have been processed. Check for incompatibilities. */
3470 (smtp_input || extract_recipients || recipients_arg < argc) &&
3471 (daemon_listen || queue_interval >= 0 || bi_option ||
3472 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3473 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3476 msg_action_arg > 0 &&
3477 (daemon_listen || queue_interval >= 0 || list_options ||
3478 (checking && msg_action != MSG_LOAD) ||
3479 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3482 (daemon_listen || queue_interval >= 0) &&
3483 (sender_address != NULL || list_options || list_queue || checking ||
3487 daemon_listen && queue_interval == 0
3490 inetd_wait_mode && queue_interval >= 0
3494 (checking || smtp_input || extract_recipients ||
3495 filter_test != FTEST_NONE || bi_option)
3498 verify_address_mode &&
3499 (address_test_mode || smtp_input || extract_recipients ||
3500 filter_test != FTEST_NONE || bi_option)
3503 address_test_mode && (smtp_input || extract_recipients ||
3504 filter_test != FTEST_NONE || bi_option)
3507 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3511 deliver_selectstring != NULL && queue_interval < 0
3514 msg_action == MSG_LOAD &&
3515 (!expansion_test || expansion_test_message != NULL)
3519 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3523 /* If debugging is set up, set the file and the file descriptor to pass on to
3524 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3525 to run in the foreground. */
3527 if (debug_selector != 0)
3529 debug_file = stderr;
3530 debug_fd = fileno(debug_file);
3531 background_daemon = FALSE;
3532 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3533 if (debug_selector != D_v) /* -v only doesn't show this */
3535 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3536 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3538 if (!version_printed)
3539 show_whats_supported(stderr);
3543 /* When started with root privilege, ensure that the limits on the number of
3544 open files and the number of processes (where that is accessible) are
3545 sufficiently large, or are unset, in case Exim has been called from an
3546 environment where the limits are screwed down. Not all OS have the ability to
3547 change some of these limits. */
3551 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3557 #ifdef RLIMIT_NOFILE
3558 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3560 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3562 rlp.rlim_cur = rlp.rlim_max = 0;
3565 /* I originally chose 1000 as a nice big number that was unlikely to
3566 be exceeded. It turns out that some older OS have a fixed upper limit of
3569 if (rlp.rlim_cur < 1000)
3571 rlp.rlim_cur = rlp.rlim_max = 1000;
3572 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3574 rlp.rlim_cur = rlp.rlim_max = 256;
3575 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3576 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3583 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3585 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3587 rlp.rlim_cur = rlp.rlim_max = 0;
3590 #ifdef RLIM_INFINITY
3591 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3593 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3595 if (rlp.rlim_cur < 1000)
3597 rlp.rlim_cur = rlp.rlim_max = 1000;
3599 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3600 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3606 /* Exim is normally entered as root (but some special configurations are
3607 possible that don't do this). However, it always spins off sub-processes that
3608 set their uid and gid as required for local delivery. We don't want to pass on
3609 any extra groups that root may belong to, so we want to get rid of them all at
3612 We need to obey setgroups() at this stage, before possibly giving up root
3613 privilege for a changed configuration file, but later on we might need to
3614 check on the additional groups for the admin user privilege - can't do that
3615 till after reading the config, which might specify the exim gid. Therefore,
3616 save the group list here first. */
3618 group_count = getgroups(NGROUPS_MAX, group_list);
3619 if (group_count < 0)
3621 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3625 /* There is a fundamental difference in some BSD systems in the matter of
3626 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3627 known not to be different. On the "different" systems there is a single group
3628 list, and the first entry in it is the current group. On all other versions of
3629 Unix there is a supplementary group list, which is in *addition* to the current
3630 group. Consequently, to get rid of all extraneous groups on a "standard" system
3631 you pass over 0 groups to setgroups(), while on a "different" system you pass
3632 over a single group - the current group, which is always the first group in the
3633 list. Calling setgroups() with zero groups on a "different" system results in
3634 an error return. The following code should cope with both types of system.
3636 However, if this process isn't running as root, setgroups() can't be used
3637 since you have to be root to run it, even if throwing away groups. Not being
3638 root here happens only in some unusual configurations. We just ignore the
3641 if (setgroups(0, NULL) != 0)
3643 if (setgroups(1, group_list) != 0 && !unprivileged)
3645 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3650 /* If the configuration file name has been altered by an argument on the
3651 command line (either a new file name or a macro definition) and the caller is
3652 not root, or if this is a filter testing run, remove any setuid privilege the
3653 program has and run as the underlying user.
3655 The exim user is locked out of this, which severely restricts the use of -C
3658 Otherwise, set the real ids to the effective values (should be root unless run
3659 from inetd, which it can either be root or the exim uid, if one is configured).
3661 There is a private mechanism for bypassing some of this, in order to make it
3662 possible to test lots of configurations automatically, without having either to
3663 recompile each time, or to patch in an actual configuration file name and other
3664 values (such as the path name). If running in the test harness, pretend that
3665 configuration file changes and macro definitions haven't happened. */
3668 (!trusted_config || /* Config changed, or */
3669 !macros_trusted()) && /* impermissible macros and */
3670 real_uid != root_uid && /* Not root, and */
3671 !running_in_test_harness /* Not fudged */
3673 expansion_test /* expansion testing */
3675 filter_test != FTEST_NONE) /* Filter testing */
3677 setgroups(group_count, group_list);
3678 exim_setugid(real_uid, real_gid, FALSE,
3679 US"-C, -D, -be or -bf forces real uid");
3680 removed_privilege = TRUE;
3682 /* In the normal case when Exim is called like this, stderr is available
3683 and should be used for any logging information because attempts to write
3684 to the log will usually fail. To arrange this, we unset really_exim. However,
3685 if no stderr is available there is no point - we might as well have a go
3686 at the log (if it fails, syslog will be written).
3688 Note that if the invoker is Exim, the logs remain available. Messing with
3689 this causes unlogged successful deliveries. */
3691 if ((log_stderr != NULL) && (real_uid != exim_uid))
3692 really_exim = FALSE;
3695 /* Privilege is to be retained for the moment. It may be dropped later,
3696 depending on the job that this Exim process has been asked to do. For now, set
3697 the real uid to the effective so that subsequent re-execs of Exim are done by a
3700 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3702 /* If testing a filter, open the file(s) now, before wasting time doing other
3703 setups and reading the message. */
3705 if ((filter_test & FTEST_SYSTEM) != 0)
3707 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3710 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3712 return EXIT_FAILURE;
3716 if ((filter_test & FTEST_USER) != 0)
3718 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3721 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3723 return EXIT_FAILURE;
3727 /* Initialise lookup_list
3728 If debugging, already called above via version reporting.
3729 In either case, we initialise the list of available lookups while running
3730 as root. All dynamically modules are loaded from a directory which is
3731 hard-coded into the binary and is code which, if not a module, would be
3732 part of Exim already. Ability to modify the content of the directory
3733 is equivalent to the ability to modify a setuid binary!
3735 This needs to happen before we read the main configuration. */
3739 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3742 /* Read the main runtime configuration data; this gives up if there
3743 is a failure. It leaves the configuration file open so that the subsequent
3744 configuration data for delivery can be read if needed.
3746 NOTE: immediatly after opening the configuration file we change the working
3747 directory to "/"! Later we change to $spool_directory. We do it there, because
3748 during readconf_main() some expansion takes place already. */
3750 /* Store the initial cwd before we change directories */
3751 initial_cwd = getcwd(NULL, 0);
3755 /* Now in directory "/" */
3757 if (cleanup_environment() == FALSE)
3758 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3761 /* If an action on specific messages is requested, or if a daemon or queue
3762 runner is being started, we need to know if Exim was called by an admin user.
3763 This is the case if the real user is root or exim, or if the real group is
3764 exim, or if one of the supplementary groups is exim or a group listed in
3765 admin_groups. We don't fail all message actions immediately if not admin_user,
3766 since some actions can be performed by non-admin users. Instead, set admin_user
3767 for later interrogation. */
3769 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3774 for (i = 0; i < group_count; i++)
3776 if (group_list[i] == exim_gid) admin_user = TRUE;
3777 else if (admin_groups != NULL)
3779 for (j = 1; j <= (int)(admin_groups[0]); j++)
3780 if (admin_groups[j] == group_list[i])
3781 { admin_user = TRUE; break; }
3783 if (admin_user) break;
3787 /* Another group of privileged users are the trusted users. These are root,
3788 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3789 are permitted to specify sender_addresses with -f on the command line, and
3790 other message parameters as well. */
3792 if (real_uid == root_uid || real_uid == exim_uid)
3793 trusted_caller = TRUE;
3798 if (trusted_users != NULL)
3800 for (i = 1; i <= (int)(trusted_users[0]); i++)
3801 if (trusted_users[i] == real_uid)
3802 { trusted_caller = TRUE; break; }
3805 if (!trusted_caller && trusted_groups != NULL)
3807 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3809 if (trusted_groups[i] == real_gid)
3810 trusted_caller = TRUE;
3811 else for (j = 0; j < group_count; j++)
3813 if (trusted_groups[i] == group_list[j])
3814 { trusted_caller = TRUE; break; }
3816 if (trusted_caller) break;
3821 /* Handle the decoding of logging options. */
3823 decode_bits(log_selector, log_selector_size, log_notall,
3824 log_selector_string, log_options, log_options_count, US"log", 0);
3829 debug_printf("configuration file is %s\n", config_main_filename);
3830 debug_printf("log selectors =");
3831 for (i = 0; i < log_selector_size; i++)
3832 debug_printf(" %08x", log_selector[i]);
3836 /* If domain literals are not allowed, check the sender address that was
3837 supplied with -f. Ditto for a stripped trailing dot. */
3839 if (sender_address != NULL)
3841 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3843 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3844 "allowed\n", sender_address);
3845 return EXIT_FAILURE;
3847 if (f_end_dot && !strip_trailing_dot)
3849 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3850 "(trailing dot not allowed)\n", sender_address);
3851 return EXIT_FAILURE;
3855 /* See if an admin user overrode our logging. */
3857 if (cmdline_syslog_name != NULL)
3861 syslog_processname = cmdline_syslog_name;
3862 log_file_path = string_copy(CUS"syslog");
3866 /* not a panic, non-privileged users should not be able to spam paniclog */
3868 "exim: you lack sufficient privilege to specify syslog process name\n");
3869 return EXIT_FAILURE;
3873 /* Paranoia check of maximum lengths of certain strings. There is a check
3874 on the length of the log file path in log.c, which will come into effect
3875 if there are any calls to write the log earlier than this. However, if we
3876 get this far but the string is very long, it is better to stop now than to
3877 carry on and (e.g.) receive a message and then have to collapse. The call to
3878 log_write() from here will cause the ultimate panic collapse if the complete
3879 file name exceeds the buffer length. */
3881 if (Ustrlen(log_file_path) > 200)
3882 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3883 "log_file_path is longer than 200 chars: aborting");
3885 if (Ustrlen(pid_file_path) > 200)
3886 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3887 "pid_file_path is longer than 200 chars: aborting");
3889 if (Ustrlen(spool_directory) > 200)
3890 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3891 "spool_directory is longer than 200 chars: aborting");
3893 /* Length check on the process name given to syslog for its TAG field,
3894 which is only permitted to be 32 characters or less. See RFC 3164. */
3896 if (Ustrlen(syslog_processname) > 32)
3897 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3898 "syslog_processname is longer than 32 chars: aborting");
3904 log_write(0, LOG_MAIN, "%s", log_oneline);
3905 return EXIT_SUCCESS;
3908 return EXIT_FAILURE;
3911 /* In some operating systems, the environment variable TMPDIR controls where
3912 temporary files are created; Exim doesn't use these (apart from when delivering
3913 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3914 If TMPDIR is found in the environment, reset it to the value defined in the
3915 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3916 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3917 EXIM_TMPDIR by the build scripts.
3923 if (environ) for (p = USS environ; *p != NULL; p++)
3925 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3926 Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3928 uschar *newp = malloc(Ustrlen(EXIM_TMPDIR) + 8);
3929 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3931 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3937 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3938 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3939 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3940 called by a user who has set the TZ variable. This then affects the timestamps
3941 in log files and in Received: headers, and any created Date: header lines. The
3942 required timezone is settable in the configuration file, so nothing can be done
3943 about this earlier - but hopefully nothing will normally be logged earlier than
3944 this. We have to make a new environment if TZ is wrong, but don't bother if
3945 timestamps_utc is set, because then all times are in UTC anyway. */
3947 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3949 timestamps_utc = TRUE;
3953 uschar *envtz = US getenv("TZ");
3954 if ((envtz == NULL && timezone_string != NULL) ||
3956 (timezone_string == NULL ||
3957 Ustrcmp(timezone_string, envtz) != 0)))
3959 uschar **p = USS environ;
3963 if (environ) while (*p++ != NULL) count++;
3964 if (envtz == NULL) count++;
3965 newp = new = malloc(sizeof(uschar *) * (count + 1));
3966 if (environ) for (p = USS environ; *p != NULL; p++)
3968 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3971 if (timezone_string != NULL)
3973 *newp = malloc(Ustrlen(timezone_string) + 4);
3974 sprintf(CS *newp++, "TZ=%s", timezone_string);
3979 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3980 tod_stamp(tod_log));
3984 /* Handle the case when we have removed the setuid privilege because of -C or
3985 -D. This means that the caller of Exim was not root.
3987 There is a problem if we were running as the Exim user. The sysadmin may
3988 expect this case to retain privilege because "the binary was called by the
3989 Exim user", but it hasn't, because either the -D option set macros, or the
3990 -C option set a non-trusted configuration file. There are two possibilities:
3992 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3993 to do message deliveries. Thus, the fact that it is running as a
3994 non-privileged user is plausible, and might be wanted in some special
3995 configurations. However, really_exim will have been set false when
3996 privilege was dropped, to stop Exim trying to write to its normal log
3997 files. Therefore, re-enable normal log processing, assuming the sysadmin
3998 has set up the log directory correctly.
4000 (2) If deliver_drop_privilege is not set, the configuration won't work as
4001 apparently intended, and so we log a panic message. In order to retain
4002 root for -C or -D, the caller must either be root or be invoking a
4003 trusted configuration file (when deliver_drop_privilege is false). */
4005 if (removed_privilege && (!trusted_config || macros != NULL) &&
4006 real_uid == exim_uid)
4008 if (deliver_drop_privilege)
4009 really_exim = TRUE; /* let logging work normally */
4011 log_write(0, LOG_MAIN|LOG_PANIC,
4012 "exim user lost privilege for using %s option",
4013 trusted_config? "-D" : "-C");
4016 /* Start up Perl interpreter if Perl support is configured and there is a
4017 perl_startup option, and the configuration or the command line specifies
4018 initializing starting. Note that the global variables are actually called
4019 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4022 if (perl_start_option != 0)
4023 opt_perl_at_start = (perl_start_option > 0);
4024 if (opt_perl_at_start && opt_perl_startup != NULL)
4027 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4028 errstr = init_perl(opt_perl_startup);
4031 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4032 return EXIT_FAILURE;
4034 opt_perl_started = TRUE;
4036 #endif /* EXIM_PERL */
4038 /* Log the arguments of the call if the configuration file said so. This is
4039 a debugging feature for finding out what arguments certain MUAs actually use.
4040 Don't attempt it if logging is disabled, or if listing variables or if
4041 verifying/testing addresses or expansions. */
4043 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4044 && really_exim && !list_options && !checking)
4047 uschar *p = big_buffer;
4048 Ustrcpy(p, "cwd= (failed)");
4050 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4053 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4055 for (i = 0; i < argc; i++)
4057 int len = Ustrlen(argv[i]);
4058 const uschar *printing;
4060 if (p + len + 8 >= big_buffer + big_buffer_size)
4063 log_write(0, LOG_MAIN, "%s", big_buffer);
4064 Ustrcpy(big_buffer, "...");
4067 printing = string_printing(argv[i]);
4068 if (printing[0] == 0) quote = US"\""; else
4070 const uschar *pp = printing;
4072 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4074 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4075 (p - big_buffer) - 4), printing, quote);
4079 if (LOGGING(arguments))
4080 log_write(0, LOG_MAIN, "%s", big_buffer);
4082 debug_printf("%s\n", big_buffer);
4085 /* Set the working directory to be the top-level spool directory. We don't rely
4086 on this in the code, which always uses fully qualified names, but it's useful
4087 for core dumps etc. Don't complain if it fails - the spool directory might not
4088 be generally accessible and calls with the -C option (and others) have lost
4089 privilege by now. Before the chdir, we try to ensure that the directory exists.
4092 if (Uchdir(spool_directory) != 0)
4095 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4096 dummy = /* quieten compiler */ Uchdir(spool_directory);
4099 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4100 alias file. Exim doesn't have such a concept, but this call is screwed into
4101 Sun's YP makefiles. Handle this by calling a configured script, as the real
4102 user who called Exim. The -oA option can be used to pass an argument to the
4107 (void)fclose(config_file);
4108 if (bi_command != NULL)
4112 argv[i++] = bi_command;
4113 if (alias_arg != NULL) argv[i++] = alias_arg;
4116 setgroups(group_count, group_list);
4117 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4119 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4120 (argv[1] == NULL)? US"" : argv[1]);
4122 execv(CS argv[0], (char *const *)argv);
4123 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4128 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4133 /* We moved the admin/trusted check to be immediately after reading the
4134 configuration file. We leave these prints here to ensure that syslog setup,
4135 logfile setup, and so on has already happened. */
4137 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4138 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4140 /* Only an admin user may start the daemon or force a queue run in the default
4141 configuration, but the queue run restriction can be relaxed. Only an admin
4142 user may request that a message be returned to its sender forthwith. Only an
4143 admin user may specify a debug level greater than D_v (because it might show
4144 passwords, etc. in lookup queries). Only an admin user may request a queue
4145 count. Only an admin user can use the test interface to scan for email
4146 (because Exim will be in the spool dir and able to look at mails). */
4150 BOOL debugset = (debug_selector & ~D_v) != 0;
4151 if (deliver_give_up || daemon_listen || malware_test_file ||
4152 (count_queue && queue_list_requires_admin) ||
4153 (list_queue && queue_list_requires_admin) ||
4154 (queue_interval >= 0 && prod_requires_admin) ||
4155 (debugset && !running_in_test_harness))
4157 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4162 /* If the real user is not root or the exim uid, the argument for passing
4163 in an open TCP/IP connection for another message is not permitted, nor is
4164 running with the -N option for any delivery action, unless this call to exim is
4165 one that supplied an input message, or we are using a patched exim for
4166 regression testing. */
4168 if (real_uid != root_uid && real_uid != exim_uid &&
4169 (continue_hostname != NULL ||
4171 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4172 )) && !running_in_test_harness)
4174 fprintf(stderr, "exim: Permission denied\n");
4175 return EXIT_FAILURE;
4178 /* If the caller is not trusted, certain arguments are ignored when running for
4179 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4180 Note that authority for performing certain actions on messages is tested in the
4181 queue_action() function. */
4183 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4185 sender_host_name = sender_host_address = interface_address =
4186 sender_ident = received_protocol = NULL;
4187 sender_host_port = interface_port = 0;
4188 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4191 /* If a sender host address is set, extract the optional port number off the
4192 end of it and check its syntax. Do the same thing for the interface address.
4193 Exim exits if the syntax is bad. */
4197 if (sender_host_address != NULL)
4198 sender_host_port = check_port(sender_host_address);
4199 if (interface_address != NULL)
4200 interface_port = check_port(interface_address);
4203 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4208 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4209 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4213 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4214 return EXIT_FAILURE;
4218 /* If an SMTP message is being received check to see if the standard input is a
4219 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4220 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4225 union sockaddr_46 inetd_sock;
4226 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4227 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4229 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4230 if (family == AF_INET || family == AF_INET6)
4232 union sockaddr_46 interface_sock;
4233 size = sizeof(interface_sock);
4235 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4236 interface_address = host_ntoa(-1, &interface_sock, NULL,
4239 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4241 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4244 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4245 NULL, &sender_host_port);
4246 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4247 "inetd is not supported when mua_wrapper is set");
4252 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4253 return EXIT_FAILURE;
4259 /* If the load average is going to be needed while receiving a message, get it
4260 now for those OS that require the first call to os_getloadavg() to be done as
4261 root. There will be further calls later for each message received. */
4263 #ifdef LOAD_AVG_NEEDS_ROOT
4264 if (receiving_message &&
4265 (queue_only_load >= 0 ||
4266 (is_inetd && smtp_load_reserve >= 0)
4269 load_average = OS_GETLOADAVG();
4273 /* The queue_only configuration option can be overridden by -odx on the command
4274 line, except that if queue_only_override is false, queue_only cannot be unset
4275 from the command line. */
4277 if (queue_only_set && (queue_only_override || arg_queue_only))
4278 queue_only = arg_queue_only;
4280 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4283 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4284 if (arg_smtp_receive_timeout >= 0)
4285 smtp_receive_timeout = arg_smtp_receive_timeout;
4287 /* If Exim was started with root privilege, unless we have already removed the
4288 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4289 except when starting the daemon or doing some kind of delivery or address
4290 testing (-bt). These are the only cases when root need to be retained. We run
4291 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4292 retained only for starting the daemon. We always do the initgroups() in this
4293 situation (controlled by the TRUE below), in order to be as close as possible
4294 to the state Exim usually runs in. */
4296 if (!unprivileged && /* originally had root AND */
4297 !removed_privilege && /* still got root AND */
4298 !daemon_listen && /* not starting the daemon */
4299 queue_interval <= 0 && /* (either kind of daemon) */
4301 deliver_drop_privilege || /* requested unprivileged */
4303 queue_interval < 0 && /* not running the queue */
4304 (msg_action_arg < 0 || /* and */
4305 msg_action != MSG_DELIVER) && /* not delivering and */
4306 (!checking || !address_test_mode) /* not address checking */
4310 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4313 /* When we are retaining a privileged uid, we still change to the exim gid. */
4318 rv = setgid(exim_gid);
4319 /* Impact of failure is that some stuff might end up with an incorrect group.
4320 We track this for failures from root, since any attempt to change privilege
4321 by root should succeed and failures should be examined. For non-root,
4322 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4323 no need to complain then. */
4326 if (!(unprivileged || removed_privilege))
4329 "exim: changing group failed: %s\n", strerror(errno));
4333 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4334 (long int)exim_gid, strerror(errno));
4338 /* Handle a request to scan a file for malware */
4339 if (malware_test_file)
4341 #ifdef WITH_CONTENT_SCAN
4343 set_process_info("scanning file for malware");
4344 result = malware_in_file(malware_test_file);
4347 printf("No malware found.\n");
4352 printf("Malware lookup returned non-okay/fail: %d\n", result);
4356 printf("Malware found: %s\n", malware_name);
4358 printf("Malware scan detected malware of unknown name.\n");
4360 printf("Malware scanning not enabled at compile time.\n");
4365 /* Handle a request to list the delivery queue */
4369 set_process_info("listing the queue");
4370 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4374 /* Handle a request to count the delivery queue */
4378 set_process_info("counting the queue");
4383 /* Handle actions on specific messages, except for the force delivery and
4384 message load actions, which are done below. Some actions take a whole list of
4385 message ids, which are known to continue up to the end of the arguments. Others
4386 take a single message id and then operate on the recipients list. */
4388 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4390 int yield = EXIT_SUCCESS;
4391 set_process_info("acting on specified messages");
4393 if (!one_msg_action)
4395 for (i = msg_action_arg; i < argc; i++)
4396 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4397 yield = EXIT_FAILURE;
4400 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4401 recipients_arg)) yield = EXIT_FAILURE;
4405 /* We used to set up here to skip reading the ACL section, on
4406 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4407 Now, since the intro of the ${acl } expansion, ACL definitions may be
4408 needed in transports so we lost the optimisation. */
4412 /* The configuration data will have been read into POOL_PERM because we won't
4413 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4414 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4415 configuration were read into POOL_MAIN, because we don't do any resets till
4416 later on. However, it seems right, and it does ensure that both pools get used.
4419 store_pool = POOL_MAIN;
4421 /* Handle the -brt option. This is for checking out retry configurations.
4422 The next three arguments are a domain name or a complete address, and
4423 optionally two error numbers. All it does is to call the function that
4424 scans the retry configuration data. */
4426 if (test_retry_arg >= 0)
4428 retry_config *yield;
4429 int basic_errno = 0;
4433 if (test_retry_arg >= argc)
4435 printf("-brt needs a domain or address argument\n");
4436 exim_exit(EXIT_FAILURE);
4438 s1 = argv[test_retry_arg++];
4441 /* If the first argument contains no @ and no . it might be a local user
4442 or it might be a single-component name. Treat as a domain. */
4444 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4446 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4447 "being \ntreated as a one-component domain, not as a local part.\n\n",
4451 /* There may be an optional second domain arg. */
4453 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4454 s2 = argv[test_retry_arg++];
4456 /* The final arg is an error name */
4458 if (test_retry_arg < argc)
4460 uschar *ss = argv[test_retry_arg];
4462 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4465 printf("%s\n", CS error);
4466 return EXIT_FAILURE;
4469 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4470 code > 100 as an error is for matching codes to the decade. Turn them into
4471 a real error code, off the decade. */
4473 if (basic_errno == ERRNO_MAIL4XX ||
4474 basic_errno == ERRNO_RCPT4XX ||
4475 basic_errno == ERRNO_DATA4XX)
4477 int code = (more_errno >> 8) & 255;
4479 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4480 else if (code > 100)
4481 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4485 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4486 if (yield == NULL) printf("No retry information found\n"); else
4489 more_errno = yield->more_errno;
4490 printf("Retry rule: %s ", yield->pattern);
4492 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4494 printf("quota%s%s ",
4495 (more_errno > 0)? "_" : "",
4496 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4498 else if (yield->basic_errno == ECONNREFUSED)
4500 printf("refused%s%s ",
4501 (more_errno > 0)? "_" : "",
4502 (more_errno == 'M')? "MX" :
4503 (more_errno == 'A')? "A" : "");
4505 else if (yield->basic_errno == ETIMEDOUT)
4508 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4510 if (more_errno != 0) printf("_%s",
4511 (more_errno == 'M')? "MX" : "A");
4514 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4515 printf("auth_failed ");
4518 for (r = yield->rules; r != NULL; r = r->next)
4520 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4521 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4527 printf(",%d.", x/1000);
4541 exim_exit(EXIT_SUCCESS);
4544 /* Handle a request to list one or more configuration options */
4545 /* If -n was set, we suppress some information */
4549 set_process_info("listing variables");
4550 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4551 else for (i = recipients_arg; i < argc; i++)
4554 (Ustrcmp(argv[i], "router") == 0 ||
4555 Ustrcmp(argv[i], "transport") == 0 ||
4556 Ustrcmp(argv[i], "authenticator") == 0 ||
4557 Ustrcmp(argv[i], "macro") == 0 ||
4558 Ustrcmp(argv[i], "environment") == 0))
4560 readconf_print(argv[i+1], argv[i], flag_n);
4563 else readconf_print(argv[i], NULL, flag_n);
4565 exim_exit(EXIT_SUCCESS);
4570 set_process_info("listing config");
4571 readconf_print(US"config", NULL, FALSE);
4572 exim_exit(EXIT_SUCCESS);
4576 /* Initialise subsystems as required */
4577 #ifndef DISABLE_DKIM
4582 /* Handle a request to deliver one or more messages that are already on the
4583 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4584 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4586 Delivery of specific messages is typically used for a small number when
4587 prodding by hand (when the option forced_delivery will be set) or when
4588 re-execing to regain root privilege. Each message delivery must happen in a
4589 separate process, so we fork a process for each one, and run them sequentially
4590 so that debugging output doesn't get intertwined, and to avoid spawning too
4591 many processes if a long list is given. However, don't fork for the last one;
4592 this saves a process in the common case when Exim is called to deliver just one
4595 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4597 if (prod_requires_admin && !admin_user)
4599 fprintf(stderr, "exim: Permission denied\n");
4600 exim_exit(EXIT_FAILURE);
4602 set_process_info("delivering specified messages");
4603 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4604 for (i = msg_action_arg; i < argc; i++)
4609 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4610 else if ((pid = fork()) == 0)
4612 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4613 _exit(EXIT_SUCCESS);
4617 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4619 exim_exit(EXIT_FAILURE);
4623 exim_exit(EXIT_SUCCESS);
4627 /* If only a single queue run is requested, without SMTP listening, we can just
4628 turn into a queue runner, with an optional starting message id. */
4630 if (queue_interval == 0 && !daemon_listen)
4632 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4633 (start_queue_run_id == NULL)? US"" : US" starting at ",
4634 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4635 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4636 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4637 set_process_info("running the queue (single queue run)");
4638 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4639 exim_exit(EXIT_SUCCESS);
4643 /* Find the login name of the real user running this process. This is always
4644 needed when receiving a message, because it is written into the spool file. It
4645 may also be used to construct a from: or a sender: header, and in this case we
4646 need the user's full name as well, so save a copy of it, checked for RFC822
4647 syntax and munged if necessary, if it hasn't previously been set by the -F
4648 argument. We may try to get the passwd entry more than once, in case NIS or
4649 other delays are in evidence. Save the home directory for use in filter testing
4654 if ((pw = getpwuid(real_uid)) != NULL)
4656 originator_login = string_copy(US pw->pw_name);
4657 originator_home = string_copy(US pw->pw_dir);
4659 /* If user name has not been set by -F, set it from the passwd entry
4660 unless -f has been used to set the sender address by a trusted user. */
4662 if (originator_name == NULL)
4664 if (sender_address == NULL ||
4665 (!trusted_caller && filter_test == FTEST_NONE))
4667 uschar *name = US pw->pw_gecos;
4668 uschar *amp = Ustrchr(name, '&');
4671 /* Most Unix specify that a '&' character in the gecos field is
4672 replaced by a copy of the login name, and some even specify that
4673 the first character should be upper cased, so that's what we do. */
4678 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4679 amp - name, name, &loffset, originator_login, amp + 1);
4680 buffer[loffset] = toupper(buffer[loffset]);
4684 /* If a pattern for matching the gecos field was supplied, apply
4685 it and then expand the name string. */
4687 if (gecos_pattern != NULL && gecos_name != NULL)
4690 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4692 if (regex_match_and_setup(re, name, 0, -1))
4694 uschar *new_name = expand_string(gecos_name);
4696 if (new_name != NULL)
4698 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4699 "gecos field \"%s\"\n", new_name, name);
4702 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4703 "\"%s\": %s\n", gecos_name, expand_string_message);
4705 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4706 "gecos field \"%s\"\n", gecos_pattern, name);
4707 store_free((void *)re);
4709 originator_name = string_copy(name);
4712 /* A trusted caller has used -f but not -F */
4714 else originator_name = US"";
4717 /* Break the retry loop */
4722 if (++i > finduser_retries) break;
4726 /* If we cannot get a user login, log the incident and give up, unless the
4727 configuration specifies something to use. When running in the test harness,
4728 any setting of unknown_login overrides the actual name. */
4730 if (originator_login == NULL || running_in_test_harness)
4732 if (unknown_login != NULL)
4734 originator_login = expand_string(unknown_login);
4735 if (originator_name == NULL && unknown_username != NULL)
4736 originator_name = expand_string(unknown_username);
4737 if (originator_name == NULL) originator_name = US"";
4739 if (originator_login == NULL)
4740 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4744 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4747 originator_name = string_copy(parse_fix_phrase(originator_name,
4748 Ustrlen(originator_name), big_buffer, big_buffer_size));
4750 /* If a message is created by this call of Exim, the uid/gid of its originator
4751 are those of the caller. These values are overridden if an existing message is
4752 read in from the spool. */
4754 originator_uid = real_uid;
4755 originator_gid = real_gid;
4757 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4758 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4760 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4761 returns. We leave this till here so that the originator_ fields are available
4762 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4765 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4769 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4770 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4771 "mua_wrapper is set");
4776 /* If the sender ident has not been set (by a trusted caller) set it to
4777 the caller. This will get overwritten below for an inetd call. If a trusted
4778 caller has set it empty, unset it. */
4780 if (sender_ident == NULL) sender_ident = originator_login;
4781 else if (sender_ident[0] == 0) sender_ident = NULL;
4783 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4784 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4785 originator_* variables set. */
4787 if (test_rewrite_arg >= 0)
4789 really_exim = FALSE;
4790 if (test_rewrite_arg >= argc)
4792 printf("-brw needs an address argument\n");
4793 exim_exit(EXIT_FAILURE);
4795 rewrite_test(argv[test_rewrite_arg]);
4796 exim_exit(EXIT_SUCCESS);
4799 /* A locally-supplied message is considered to be coming from a local user
4800 unless a trusted caller supplies a sender address with -f, or is passing in the
4801 message via SMTP (inetd invocation or otherwise). */
4803 if ((sender_address == NULL && !smtp_input) ||
4804 (!trusted_caller && filter_test == FTEST_NONE))
4806 sender_local = TRUE;
4808 /* A trusted caller can supply authenticated_sender and authenticated_id
4809 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4810 defaults except when host checking. */
4812 if (authenticated_sender == NULL && !host_checking)
4813 authenticated_sender = string_sprintf("%s@%s", originator_login,
4814 qualify_domain_sender);
4815 if (authenticated_id == NULL && !host_checking)
4816 authenticated_id = originator_login;
4819 /* Trusted callers are always permitted to specify the sender address.
4820 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4821 is specified is the empty address. However, if a trusted caller does not
4822 specify a sender address for SMTP input, we leave sender_address unset. This
4823 causes the MAIL commands to be honoured. */
4825 if ((!smtp_input && sender_address == NULL) ||
4826 !receive_check_set_sender(sender_address))
4828 /* Either the caller is not permitted to set a general sender, or this is
4829 non-SMTP input and the trusted caller has not set a sender. If there is no
4830 sender, or if a sender other than <> is set, override with the originator's
4831 login (which will get qualified below), except when checking things. */
4833 if (sender_address == NULL /* No sender_address set */
4835 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4836 !checking && /* Not running tests, AND */
4837 filter_test == FTEST_NONE)) /* Not testing a filter */
4839 sender_address = originator_login;
4840 sender_address_forced = FALSE;
4841 sender_address_domain = 0;
4845 /* Remember whether an untrusted caller set the sender address */
4847 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4849 /* Ensure that the sender address is fully qualified unless it is the empty
4850 address, which indicates an error message, or doesn't exist (root caller, smtp
4851 interface, no -f argument). */
4853 if (sender_address != NULL && sender_address[0] != 0 &&
4854 sender_address_domain == 0)
4855 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4856 qualify_domain_sender);
4858 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4860 /* Handle a request to verify a list of addresses, or test them for delivery.
4861 This must follow the setting of the sender address, since routers can be
4862 predicated upon the sender. If no arguments are given, read addresses from
4863 stdin. Set debug_level to at least D_v to get full output for address testing.
4866 if (verify_address_mode || address_test_mode)
4869 int flags = vopt_qualify;
4871 if (verify_address_mode)
4873 if (!verify_as_sender) flags |= vopt_is_recipient;
4874 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4879 flags |= vopt_is_recipient;
4880 debug_selector |= D_v;
4881 debug_file = stderr;
4882 debug_fd = fileno(debug_file);
4883 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4886 if (recipients_arg < argc)
4888 while (recipients_arg < argc)
4890 uschar *s = argv[recipients_arg++];
4893 BOOL finished = FALSE;
4894 uschar *ss = parse_find_address_end(s, FALSE);
4895 if (*ss == ',') *ss = 0; else finished = TRUE;
4896 test_address(s, flags, &exit_value);
4899 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4906 uschar *s = get_stdinput(NULL, NULL);
4907 if (s == NULL) break;
4908 test_address(s, flags, &exit_value);
4912 exim_exit(exit_value);
4915 /* Handle expansion checking. Either expand items on the command line, or read
4916 from stdin if there aren't any. If -Mset was specified, load the message so
4917 that its variables can be used, but restrict this facility to admin users.
4918 Otherwise, if -bem was used, read a message from stdin. */
4922 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4924 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4927 fprintf(stderr, "exim: permission denied\n");
4930 message_id = argv[msg_action_arg];
4931 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4932 if (!spool_open_datafile(message_id))
4933 printf ("Failed to load message datafile %s\n", message_id);
4934 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4935 printf ("Failed to load message %s\n", message_id);
4938 /* Read a test message from a file. We fudge it up to be on stdin, saving
4939 stdin itself for later reading of expansion strings. */
4941 else if (expansion_test_message != NULL)
4943 int save_stdin = dup(0);
4944 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4947 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4949 return EXIT_FAILURE;
4952 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4953 message_ended = END_NOTENDED;
4954 read_message_body(receive_msg(extract_recipients));
4955 message_linecount += body_linecount;
4956 (void)dup2(save_stdin, 0);
4957 (void)close(save_stdin);
4958 clearerr(stdin); /* Required by Darwin */
4961 /* Allow $recipients for this testing */
4963 enable_dollar_recipients = TRUE;
4965 /* Expand command line items */
4967 if (recipients_arg < argc)
4969 while (recipients_arg < argc)
4971 uschar *s = argv[recipients_arg++];
4972 uschar *ss = expand_string(s);
4973 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4974 else printf("%s\n", CS ss);
4982 char *(*fn_readline)(const char *) = NULL;
4983 void (*fn_addhist)(const char *) = NULL;
4986 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4992 uschar *source = get_stdinput(fn_readline, fn_addhist);
4993 if (source == NULL) break;
4994 ss = expand_string(source);
4996 printf ("Failed: %s\n", expand_string_message);
4997 else printf("%s\n", CS ss);
5001 if (dlhandle != NULL) dlclose(dlhandle);
5005 /* The data file will be open after -Mset */
5007 if (deliver_datafile >= 0)
5009 (void)close(deliver_datafile);
5010 deliver_datafile = -1;
5013 exim_exit(EXIT_SUCCESS);
5017 /* The active host name is normally the primary host name, but it can be varied
5018 for hosts that want to play several parts at once. We need to ensure that it is
5019 set for host checking, and for receiving messages. */
5021 smtp_active_hostname = primary_hostname;
5022 if (raw_active_hostname != NULL)
5024 uschar *nah = expand_string(raw_active_hostname);
5027 if (!expand_string_forcedfail)
5028 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5029 "(smtp_active_hostname): %s", raw_active_hostname,
5030 expand_string_message);
5032 else if (nah[0] != 0) smtp_active_hostname = nah;
5035 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5036 given IP address so that the blocking and relay configuration can be tested.
5037 Unless a sender_ident was set by -oMt, we discard it (the default is the
5038 caller's login name). An RFC 1413 call is made only if we are running in the
5039 test harness and an incoming interface and both ports are specified, because
5040 there is no TCP/IP call to find the ident for. */
5047 if (!sender_ident_set)
5049 sender_ident = NULL;
5050 if (running_in_test_harness && sender_host_port != 0 &&
5051 interface_address != NULL && interface_port != 0)
5052 verify_get_ident(1413);
5055 /* In case the given address is a non-canonical IPv6 address, canonicize
5056 it. The code works for both IPv4 and IPv6, as it happens. */
5058 size = host_aton(sender_host_address, x);
5059 sender_host_address = store_get(48); /* large enough for full IPv6 */
5060 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5062 /* Now set up for testing */
5064 host_build_sender_fullhost();
5068 sender_local = FALSE;
5069 sender_host_notsocket = TRUE;
5070 debug_file = stderr;
5071 debug_fd = fileno(debug_file);
5072 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5073 "**** but without any ident (RFC 1413) callback.\n"
5074 "**** This is not for real!\n\n",
5075 sender_host_address);
5077 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5078 if (verify_check_host(&hosts_connection_nolog) == OK)
5079 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5080 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5082 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5083 because a log line has already been written for all its failure exists
5084 (usually "connection refused: <reason>") and writing another one is
5085 unnecessary clutter. */
5087 if (smtp_start_session())
5089 reset_point = store_get(0);
5092 store_reset(reset_point);
5093 if (smtp_setup_msg() <= 0) break;
5094 if (!receive_msg(FALSE)) break;
5098 exim_exit(EXIT_SUCCESS);
5102 /* Arrange for message reception if recipients or SMTP were specified;
5103 otherwise complain unless a version print (-bV) happened or this is a filter
5104 verification test or info dump.
5105 In the former case, show the configuration file name. */
5107 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5109 if (version_printed)
5111 printf("Configuration file is %s\n", config_main_filename);
5112 return EXIT_SUCCESS;
5115 if (info_flag != CMDINFO_NONE)
5117 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5118 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5121 if (filter_test == FTEST_NONE)
5122 exim_usage(called_as);
5126 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5127 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5128 that we are not called from inetd, because that is rejected above. The
5129 following configuration settings are forced here:
5131 (1) Synchronous delivery (-odi)
5132 (2) Errors to stderr (-oep == -oeq)
5133 (3) No parallel remote delivery
5134 (4) Unprivileged delivery
5136 We don't force overall queueing options because there are several of them;
5137 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5138 to override any SMTP queueing. */
5142 synchronous_delivery = TRUE;
5143 arg_error_handling = ERRORS_STDERR;
5144 remote_max_parallel = 1;
5145 deliver_drop_privilege = TRUE;
5147 queue_smtp_domains = NULL;
5149 message_utf8_downconvert = -1; /* convert-if-needed */
5154 /* Prepare to accept one or more new messages on the standard input. When a
5155 message has been read, its id is returned in message_id[]. If doing immediate
5156 delivery, we fork a delivery process for each received message, except for the
5157 last one, where we can save a process switch.
5159 It is only in non-smtp mode that error_handling is allowed to be changed from
5160 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5161 sendmail error modes other than -oem ever actually used? Later: yes.) */
5163 if (!smtp_input) error_handling = arg_error_handling;
5165 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5166 logging being sent down the socket and make an identd call to get the
5171 (void)fclose(stderr);
5172 exim_nullstd(); /* Re-open to /dev/null */
5173 verify_get_ident(IDENT_PORT);
5174 host_build_sender_fullhost();
5175 set_process_info("handling incoming connection from %s via inetd",
5179 /* If the sender host address has been set, build sender_fullhost if it hasn't
5180 already been done (which it will have been for inetd). This caters for the
5181 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5182 so that the test for IP options is skipped for -bs input. */
5184 if (sender_host_address != NULL && sender_fullhost == NULL)
5186 host_build_sender_fullhost();
5187 set_process_info("handling incoming connection from %s via -oMa",
5189 sender_host_notsocket = TRUE;
5192 /* Otherwise, set the sender host as unknown except for inetd calls. This
5193 prevents host checking in the case of -bs not from inetd and also for -bS. */
5195 else if (!is_inetd) sender_host_unknown = TRUE;
5197 /* If stdout does not exist, then dup stdin to stdout. This can happen
5198 if exim is started from inetd. In this case fd 0 will be set to the socket,
5199 but fd 1 will not be set. This also happens for passed SMTP channels. */
5201 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5203 /* Set up the incoming protocol name and the state of the program. Root is
5204 allowed to force received protocol via the -oMr option above. If we have come
5205 via inetd, the process info has already been set up. We don't set
5206 received_protocol here for smtp input, as it varies according to
5207 batch/HELO/EHLO/AUTH/TLS. */
5211 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5212 smtp_batched_input? "batched " : "",
5213 (sender_address!= NULL)? sender_address : originator_login);
5217 if (received_protocol == NULL)
5218 received_protocol = string_sprintf("local%s", called_as);
5219 set_process_info("accepting a local non-SMTP message from <%s>",
5223 /* Initialize the session_local_queue-only flag (this will be ignored if
5224 mua_wrapper is set) */
5227 session_local_queue_only = queue_only;
5229 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5230 the spool if so configured. On failure, we must not attempt to send an error
5231 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5232 error code is given.) */
5234 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5236 fprintf(stderr, "exim: insufficient disk space\n");
5237 return EXIT_FAILURE;
5240 /* If this is smtp input of any kind, real or batched, handle the start of the
5243 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5244 because a log line has already been written for all its failure exists
5245 (usually "connection refused: <reason>") and writing another one is
5246 unnecessary clutter. */
5252 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5253 if (verify_check_host(&hosts_connection_nolog) == OK)
5254 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5255 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5256 if (!smtp_start_session())
5259 exim_exit(EXIT_SUCCESS);
5263 /* Otherwise, set up the input size limit here. */
5267 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5268 if (expand_string_message != NULL)
5270 if (thismessage_size_limit == -1)
5271 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5272 "message_size_limit: %s", expand_string_message);
5274 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5275 "message_size_limit: %s", expand_string_message);
5279 /* Loop for several messages when reading SMTP input. If we fork any child
5280 processes, we don't want to wait for them unless synchronous delivery is
5281 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5282 same as SIG_DFL, despite the fact that documentation often lists the default as
5283 "ignore". This is a confusing area. This is what I know:
5285 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5286 processes that complete simply to go away without ever becoming defunct. You
5287 can't then wait for them - but we don't want to wait for them in the
5288 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5289 happen for all OS (e.g. *BSD is different).
5291 But that's not the end of the story. Some (many? all?) systems have the
5292 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5293 has by default, so it seems that the difference is merely one of default
5294 (compare restarting vs non-restarting signals).
5296 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5297 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5298 of the loop below. Paranoia rules.
5300 February 2003: That's *still* not the end of the story. There are now versions
5301 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5302 process then calls waitpid(), a grumble is written to the system log, because
5303 this is logically inconsistent. In other words, it doesn't like the paranoia.
5304 As a consequenc of this, the waitpid() below is now excluded if we are sure
5305 that SIG_IGN works. */
5307 if (!synchronous_delivery)
5310 struct sigaction act;
5311 act.sa_handler = SIG_IGN;
5312 sigemptyset(&(act.sa_mask));
5313 act.sa_flags = SA_NOCLDWAIT;
5314 sigaction(SIGCHLD, &act, NULL);
5316 signal(SIGCHLD, SIG_IGN);
5320 /* Save the current store pool point, for resetting at the start of
5321 each message, and save the real sender address, if any. */
5323 reset_point = store_get(0);
5324 real_sender_address = sender_address;
5326 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5327 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5332 store_reset(reset_point);
5335 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5336 input and build the recipients list, before calling receive_msg() to read the
5337 message proper. Whatever sender address is given in the SMTP transaction is
5338 often ignored for local senders - we use the actual sender, which is normally
5339 either the underlying user running this process or a -f argument provided by
5340 a trusted caller. It is saved in real_sender_address. The test for whether to
5341 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5346 if ((rc = smtp_setup_msg()) > 0)
5348 if (real_sender_address != NULL &&
5349 !receive_check_set_sender(sender_address))
5351 sender_address = raw_sender = real_sender_address;
5352 sender_address_unrewritten = NULL;
5355 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5356 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5357 the very end. The result of the ACL is ignored (as for other non-SMTP
5358 messages). It is run for its potential side effects. */
5360 if (smtp_batched_input && acl_not_smtp_start != NULL)
5362 uschar *user_msg, *log_msg;
5363 enable_dollar_recipients = TRUE;
5364 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5365 &user_msg, &log_msg);
5366 enable_dollar_recipients = FALSE;
5369 /* Now get the data for the message */
5371 more = receive_msg(extract_recipients);
5372 if (message_id[0] == 0)
5375 smtp_log_no_mail(); /* Log no mail if configured */
5376 exim_exit(EXIT_FAILURE);
5381 smtp_log_no_mail(); /* Log no mail if configured */
5382 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5386 /* In the non-SMTP case, we have all the information from the command
5387 line, but must process it in case it is in the more general RFC822
5388 format, and in any case, to detect syntax errors. Also, it appears that
5389 the use of comma-separated lists as single arguments is common, so we
5390 had better support them. */
5396 int count = argc - recipients_arg;
5397 uschar **list = argv + recipients_arg;
5399 /* These options cannot be changed dynamically for non-SMTP messages */
5401 active_local_sender_retain = local_sender_retain;
5402 active_local_from_check = local_from_check;
5404 /* Save before any rewriting */
5406 raw_sender = string_copy(sender_address);
5408 /* Loop for each argument */
5410 for (i = 0; i < count; i++)
5412 int start, end, domain;
5414 uschar *s = list[i];
5416 /* Loop for each comma-separated address */
5420 BOOL finished = FALSE;
5422 uschar *ss = parse_find_address_end(s, FALSE);
5424 if (*ss == ',') *ss = 0; else finished = TRUE;
5426 /* Check max recipients - if -t was used, these aren't recipients */
5428 if (recipients_max > 0 && ++rcount > recipients_max &&
5429 !extract_recipients)
5430 if (error_handling == ERRORS_STDERR)
5432 fprintf(stderr, "exim: too many recipients\n");
5433 exim_exit(EXIT_FAILURE);
5438 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5439 errors_sender_rc : EXIT_FAILURE;
5444 BOOL b = allow_utf8_domains;
5445 allow_utf8_domains = TRUE;
5448 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5451 if (string_is_utf8(recipient))
5452 message_smtputf8 = TRUE;
5454 allow_utf8_domains = b;
5457 if (domain == 0 && !allow_unqualified_recipient)
5460 errmess = US"unqualified recipient address not allowed";
5463 if (recipient == NULL)
5465 if (error_handling == ERRORS_STDERR)
5467 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5468 string_printing(list[i]), errmess);
5469 exim_exit(EXIT_FAILURE);
5475 eblock.text1 = string_printing(list[i]);
5476 eblock.text2 = errmess;
5478 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5479 errors_sender_rc : EXIT_FAILURE;
5483 receive_add_recipient(recipient, -1);
5486 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5490 /* Show the recipients when debugging */
5495 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5496 if (recipients_list != NULL)
5498 debug_printf("Recipients:\n");
5499 for (i = 0; i < recipients_count; i++)
5500 debug_printf(" %s\n", recipients_list[i].address);
5504 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5505 ignored; rejecting here would just add complication, and it can just as
5506 well be done later. Allow $recipients to be visible in the ACL. */
5508 if (acl_not_smtp_start != NULL)
5510 uschar *user_msg, *log_msg;
5511 enable_dollar_recipients = TRUE;
5512 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5513 &user_msg, &log_msg);
5514 enable_dollar_recipients = FALSE;
5517 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5518 will just read the headers for the message, and not write anything onto the
5521 message_ended = END_NOTENDED;
5522 more = receive_msg(extract_recipients);
5524 /* more is always FALSE here (not SMTP message) when reading a message
5525 for real; when reading the headers of a message for filter testing,
5526 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5528 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5529 } /* Non-SMTP message reception */
5531 /* If this is a filter testing run, there are headers in store, but
5532 no message on the spool. Run the filtering code in testing mode, setting
5533 the domain to the qualify domain and the local part to the current user,
5534 unless they have been set by options. The prefix and suffix are left unset
5535 unless specified. The the return path is set to to the sender unless it has
5536 already been set from a return-path header in the message. */
5538 if (filter_test != FTEST_NONE)
5540 deliver_domain = (ftest_domain != NULL)?
5541 ftest_domain : qualify_domain_recipient;
5542 deliver_domain_orig = deliver_domain;
5543 deliver_localpart = (ftest_localpart != NULL)?
5544 ftest_localpart : originator_login;
5545 deliver_localpart_orig = deliver_localpart;
5546 deliver_localpart_prefix = ftest_prefix;
5547 deliver_localpart_suffix = ftest_suffix;
5548 deliver_home = originator_home;
5550 if (return_path == NULL)
5552 printf("Return-path copied from sender\n");
5553 return_path = string_copy(sender_address);
5556 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5557 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5559 receive_add_recipient(
5560 string_sprintf("%s%s%s@%s",
5561 (ftest_prefix == NULL)? US"" : ftest_prefix,
5563 (ftest_suffix == NULL)? US"" : ftest_suffix,
5564 deliver_domain), -1);
5566 printf("Recipient = %s\n", recipients_list[0].address);
5567 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5568 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5570 if (chdir("/")) /* Get away from wherever the user is running this from */
5572 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5573 exim_exit(EXIT_FAILURE);
5576 /* Now we run either a system filter test, or a user filter test, or both.
5577 In the latter case, headers added by the system filter will persist and be
5578 available to the user filter. We need to copy the filter variables
5581 if ((filter_test & FTEST_SYSTEM) != 0)
5583 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5584 exim_exit(EXIT_FAILURE);
5587 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5589 if ((filter_test & FTEST_USER) != 0)
5591 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5592 exim_exit(EXIT_FAILURE);
5595 exim_exit(EXIT_SUCCESS);
5598 /* Else act on the result of message reception. We should not get here unless
5599 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5600 will be TRUE. If it is not, check on the number of messages received in this
5603 if (!session_local_queue_only &&
5604 smtp_accept_queue_per_connection > 0 &&
5605 receive_messagecount > smtp_accept_queue_per_connection)
5607 session_local_queue_only = TRUE;
5608 queue_only_reason = 2;
5611 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5612 and queue_only_load is set, check that the load average is below it. If it is
5613 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5614 default), we put the whole session into queue_only mode. It then remains this
5615 way for any subsequent messages on the same SMTP connection. This is a
5616 deliberate choice; even though the load average may fall, it doesn't seem
5617 right to deliver later messages on the same call when not delivering earlier
5618 ones. However, there are odd cases where this is not wanted, so this can be
5619 changed by setting queue_only_load_latch false. */
5621 local_queue_only = session_local_queue_only;
5622 if (!local_queue_only && queue_only_load >= 0)
5624 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5625 if (local_queue_only)
5627 queue_only_reason = 3;
5628 if (queue_only_load_latch) session_local_queue_only = TRUE;
5632 /* If running as an MUA wrapper, all queueing options and freezing options
5636 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5638 /* Log the queueing here, when it will get a message id attached, but
5639 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5642 if (local_queue_only) switch(queue_only_reason)
5645 log_write(L_delay_delivery,
5646 LOG_MAIN, "no immediate delivery: more than %d messages "
5647 "received in one connection", smtp_accept_queue_per_connection);
5651 log_write(L_delay_delivery,
5652 LOG_MAIN, "no immediate delivery: load average %.2f",
5653 (double)load_average/1000.0);
5657 /* Else do the delivery unless the ACL or local_scan() called for queue only
5658 or froze the message. Always deliver in a separate process. A fork failure is
5659 not a disaster, as the delivery will eventually happen on a subsequent queue
5660 run. The search cache must be tidied before the fork, as the parent will
5661 do it before exiting. The child will trigger a lookup failure and
5662 thereby defer the delivery if it tries to use (for example) a cached ldap
5663 connection that the parent has called unbind on. */
5665 else if (!queue_only_policy && !deliver_freeze)
5670 if ((pid = fork()) == 0)
5673 close_unwanted(); /* Close unwanted file descriptors and TLS */
5674 exim_nullstd(); /* Ensure std{in,out,err} exist */
5676 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5677 mode, deliver_drop_privilege is forced TRUE). */
5679 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5681 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5683 /* Control does not return here. */
5686 /* No need to re-exec */
5688 rc = deliver_message(message_id, FALSE, FALSE);
5690 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5691 EXIT_SUCCESS : EXIT_FAILURE);
5696 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5697 "process: %s", strerror(errno));
5700 /* In the parent, wait if synchronous delivery is required. This will
5701 always be the case in MUA wrapper mode. */
5703 else if (synchronous_delivery)
5706 while (wait(&status) != pid);
5707 if ((status & 0x00ff) != 0)
5708 log_write(0, LOG_MAIN|LOG_PANIC,
5709 "process %d crashed with signal %d while delivering %s",
5710 (int)pid, status & 0x00ff, message_id);
5711 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5715 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5716 automatically reaps children (see comments above the loop), clear away any
5717 finished subprocesses here, in case there are lots of messages coming in
5718 from the same source. */
5720 #ifndef SIG_IGN_WORKS
5721 while (waitpid(-1, NULL, WNOHANG) > 0);
5725 exim_exit(EXIT_SUCCESS); /* Never returns */
5726 return 0; /* To stop compiler warning */