1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
136 int ovector[3*(EXPAND_MAXN+1)];
137 uschar * s = string_copy(subject); /* de-constifying */
138 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
139 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
141 if (n == 0) n = EXPAND_MAXN + 1;
145 expand_nmax = (setup < 0)? 0 : setup + 1;
146 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
148 expand_nstring[expand_nmax] = s + ovector[nn];
149 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 /*************************************************
160 * Set up processing details *
161 *************************************************/
163 /* Save a text string for dumping when SIGUSR1 is received.
164 Do checks for overruns.
166 Arguments: format and arguments, as for printf()
171 set_process_info(const char *format, ...)
175 sprintf(CS process_info, "%5d ", (int)getpid());
176 len = Ustrlen(process_info);
177 va_start(ap, format);
178 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
179 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
180 len = Ustrlen(process_info);
181 process_info[len+0] = '\n';
182 process_info[len+1] = '\0';
183 process_info_len = len + 1;
184 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
191 /*************************************************
192 * Handler for SIGUSR1 *
193 *************************************************/
195 /* SIGUSR1 causes any exim process to write to the process log details of
196 what it is currently doing. It will only be used if the OS is capable of
197 setting up a handler that causes automatic restarting of any system call
198 that is in progress at the time.
200 This function takes care to be signal-safe.
202 Argument: the signal number (SIGUSR1)
207 usr1_handler(int sig)
211 os_restarting_signal(sig, usr1_handler);
213 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
216 /* If we are already running as the Exim user, try to create it in the
217 current process (assuming spool_directory exists). Otherwise, if we are
218 root, do the creation in an exim:exim subprocess. */
220 int euid = geteuid();
221 if (euid == exim_uid)
222 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
223 else if (euid == root_uid)
224 fd = log_create_as_exim(process_log_path);
227 /* If we are neither exim nor root, or if we failed to create the log file,
228 give up. There is not much useful we can do with errors, since we don't want
229 to disrupt whatever is going on outside the signal handler. */
233 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
239 /*************************************************
241 *************************************************/
243 /* This handler is enabled most of the time that Exim is running. The handler
244 doesn't actually get used unless alarm() has been called to set a timer, to
245 place a time limit on a system call of some kind. When the handler is run, it
248 There are some other SIGALRM handlers that are used in special cases when more
249 than just a flag setting is required; for example, when reading a message's
250 input. These are normally set up in the code module that uses them, and the
251 SIGALRM handler is reset to this one afterwards.
253 Argument: the signal value (SIGALRM)
258 sigalrm_handler(int sig)
260 sig = sig; /* Keep picky compilers happy */
262 os_non_restarting_signal(SIGALRM, sigalrm_handler);
267 /*************************************************
268 * Sleep for a fractional time interval *
269 *************************************************/
271 /* This function is called by millisleep() and exim_wait_tick() to wait for a
272 period of time that may include a fraction of a second. The coding is somewhat
273 tedious. We do not expect setitimer() ever to fail, but if it does, the process
274 will wait for ever, so we panic in this instance. (There was a case of this
275 when a bug in a function that calls milliwait() caused it to pass invalid data.
276 That's when I added the check. :-)
278 We assume it to be not worth sleeping for under 100us; this value will
279 require revisiting as hardware advances. This avoids the issue of
280 a zero-valued timer setting meaning "never fire".
282 Argument: an itimerval structure containing the interval
287 milliwait(struct itimerval *itval)
290 sigset_t old_sigmask;
292 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
294 (void)sigemptyset(&sigmask); /* Empty mask */
295 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
296 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
297 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
298 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
299 "setitimer() failed: %s", strerror(errno));
300 (void)sigfillset(&sigmask); /* All signals */
301 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
302 (void)sigsuspend(&sigmask); /* Until SIGALRM */
303 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
309 /*************************************************
310 * Millisecond sleep function *
311 *************************************************/
313 /* The basic sleep() function has a granularity of 1 second, which is too rough
314 in some cases - for example, when using an increasing delay to slow down
317 Argument: number of millseconds
324 struct itimerval itval;
325 itval.it_interval.tv_sec = 0;
326 itval.it_interval.tv_usec = 0;
327 itval.it_value.tv_sec = msec/1000;
328 itval.it_value.tv_usec = (msec % 1000) * 1000;
334 /*************************************************
335 * Compare microsecond times *
336 *************************************************/
343 Returns: -1, 0, or +1
347 exim_tvcmp(struct timeval *t1, struct timeval *t2)
349 if (t1->tv_sec > t2->tv_sec) return +1;
350 if (t1->tv_sec < t2->tv_sec) return -1;
351 if (t1->tv_usec > t2->tv_usec) return +1;
352 if (t1->tv_usec < t2->tv_usec) return -1;
359 /*************************************************
360 * Clock tick wait function *
361 *************************************************/
363 /* Exim uses a time + a pid to generate a unique identifier in two places: its
364 message IDs, and in file names for maildir deliveries. Because some OS now
365 re-use pids within the same second, sub-second times are now being used.
366 However, for absolute certaintly, we must ensure the clock has ticked before
367 allowing the relevant process to complete. At the time of implementation of
368 this code (February 2003), the speed of processors is such that the clock will
369 invariably have ticked already by the time a process has done its job. This
370 function prepares for the time when things are faster - and it also copes with
371 clocks that go backwards.
374 then_tv A timeval which was used to create uniqueness; its usec field
375 has been rounded down to the value of the resolution.
376 We want to be sure the current time is greater than this.
377 resolution The resolution that was used to divide the microseconds
378 (1 for maildir, larger for message ids)
384 exim_wait_tick(struct timeval *then_tv, int resolution)
386 struct timeval now_tv;
387 long int now_true_usec;
389 (void)gettimeofday(&now_tv, NULL);
390 now_true_usec = now_tv.tv_usec;
391 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
393 if (exim_tvcmp(&now_tv, then_tv) <= 0)
395 struct itimerval itval;
396 itval.it_interval.tv_sec = 0;
397 itval.it_interval.tv_usec = 0;
398 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
399 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
401 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
402 negative value for the microseconds is possible only in the case when "now"
403 is more than a second less than "then". That means that itval.it_value.tv_sec
404 is greater than zero. The following correction is therefore safe. */
406 if (itval.it_value.tv_usec < 0)
408 itval.it_value.tv_usec += 1000000;
409 itval.it_value.tv_sec -= 1;
412 DEBUG(D_transport|D_receive)
414 if (!running_in_test_harness)
416 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
417 then_tv->tv_sec, (long) then_tv->tv_usec,
418 now_tv.tv_sec, (long) now_tv.tv_usec);
419 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
420 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
431 /*************************************************
432 * Call fopen() with umask 777 and adjust mode *
433 *************************************************/
435 /* Exim runs with umask(0) so that files created with open() have the mode that
436 is specified in the open() call. However, there are some files, typically in
437 the spool directory, that are created with fopen(). They end up world-writeable
438 if no precautions are taken. Although the spool directory is not accessible to
439 the world, this is an untidiness. So this is a wrapper function for fopen()
440 that sorts out the mode of the created file.
443 filename the file name
444 options the fopen() options
445 mode the required mode
447 Returns: the fopened FILE or NULL
451 modefopen(const uschar *filename, const char *options, mode_t mode)
453 mode_t saved_umask = umask(0777);
454 FILE *f = Ufopen(filename, options);
455 (void)umask(saved_umask);
456 if (f != NULL) (void)fchmod(fileno(f), mode);
463 /*************************************************
464 * Ensure stdin, stdout, and stderr exist *
465 *************************************************/
467 /* Some operating systems grumble if an exec() happens without a standard
468 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
469 file will be opened and will use these fd values, and then some other bit of
470 code will assume, for example, that it can write error messages to stderr.
471 This function ensures that fds 0, 1, and 2 are open if they do not already
472 exist, by connecting them to /dev/null.
474 This function is also used to ensure that std{in,out,err} exist at all times,
475 so that if any library that Exim calls tries to use them, it doesn't crash.
487 for (i = 0; i <= 2; i++)
489 if (fstat(i, &statbuf) < 0 && errno == EBADF)
491 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
492 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
493 string_open_failed(errno, "/dev/null"));
494 if (devnull != i) (void)dup2(devnull, i);
497 if (devnull > 2) (void)close(devnull);
503 /*************************************************
504 * Close unwanted file descriptors for delivery *
505 *************************************************/
507 /* This function is called from a new process that has been forked to deliver
508 an incoming message, either directly, or using exec.
510 We want any smtp input streams to be closed in this new process. However, it
511 has been observed that using fclose() here causes trouble. When reading in -bS
512 input, duplicate copies of messages have been seen. The files will be sharing a
513 file pointer with the parent process, and it seems that fclose() (at least on
514 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
515 least sometimes. Hence we go for closing the underlying file descriptors.
517 If TLS is active, we want to shut down the TLS library, but without molesting
518 the parent's SSL connection.
520 For delivery of a non-SMTP message, we want to close stdin and stdout (and
521 stderr unless debugging) because the calling process might have set them up as
522 pipes and be waiting for them to close before it waits for the submission
523 process to terminate. If they aren't closed, they hold up the calling process
524 until the initial delivery process finishes, which is not what we want.
526 Exception: We do want it for synchronous delivery!
528 And notwithstanding all the above, if D_resolver is set, implying resolver
529 debugging, leave stdout open, because that's where the resolver writes its
532 When we close stderr (which implies we've also closed stdout), we also get rid
533 of any controlling terminal.
545 tls_close(TRUE, FALSE); /* Shut down the TLS library */
547 (void)close(fileno(smtp_in));
548 (void)close(fileno(smtp_out));
553 (void)close(0); /* stdin */
554 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
555 if (debug_selector == 0) /* stderr */
557 if (!synchronous_delivery)
570 /*************************************************
572 *************************************************/
574 /* This function sets a new uid and gid permanently, optionally calling
575 initgroups() to set auxiliary groups. There are some special cases when running
576 Exim in unprivileged modes. In these situations the effective uid will not be
577 root; if we already have the right effective uid/gid, and don't need to
578 initialize any groups, leave things as they are.
583 igflag TRUE if initgroups() wanted
584 msg text to use in debugging output and failure log
586 Returns: nothing; bombs out on failure
590 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
592 uid_t euid = geteuid();
593 gid_t egid = getegid();
595 if (euid == root_uid || euid != uid || egid != gid || igflag)
597 /* At least one OS returns +1 for initgroups failure, so just check for
602 struct passwd *pw = getpwuid(uid);
605 if (initgroups(pw->pw_name, gid) != 0)
606 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
607 (long int)uid, strerror(errno));
609 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
610 "no passwd entry for uid=%ld", (long int)uid);
613 if (setgid(gid) < 0 || setuid(uid) < 0)
615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
616 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
620 /* Debugging output included uid/gid and all groups */
624 int group_count, save_errno;
625 gid_t group_list[NGROUPS_MAX];
626 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
627 (long int)geteuid(), (long int)getegid(), (long int)getpid());
628 group_count = getgroups(NGROUPS_MAX, group_list);
630 debug_printf(" auxiliary group list:");
634 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
636 else if (group_count < 0)
637 debug_printf(" <error: %s>", strerror(save_errno));
638 else debug_printf(" <none>");
646 /*************************************************
648 *************************************************/
650 /* Exim exits via this function so that it always clears up any open
656 Returns: does not return
664 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
665 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
672 /*************************************************
673 * Extract port from host address *
674 *************************************************/
676 /* Called to extract the port from the values given to -oMa and -oMi.
677 It also checks the syntax of the address, and terminates it before the
678 port data when a port is extracted.
681 address the address, with possible port on the end
683 Returns: the port, or zero if there isn't one
684 bombs out on a syntax error
688 check_port(uschar *address)
690 int port = host_address_extract_port(address);
691 if (string_is_ip_address(address, NULL) == 0)
693 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
701 /*************************************************
702 * Test/verify an address *
703 *************************************************/
705 /* This function is called by the -bv and -bt code. It extracts a working
706 address from a full RFC 822 address. This isn't really necessary per se, but it
707 has the effect of collapsing source routes.
711 flags flag bits for verify_address()
712 exit_value to be set for failures
718 test_address(uschar *s, int flags, int *exit_value)
720 int start, end, domain;
721 uschar *parse_error = NULL;
722 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
726 fprintf(stdout, "syntax error: %s\n", parse_error);
731 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
732 -1, -1, NULL, NULL, NULL);
733 if (rc == FAIL) *exit_value = 2;
734 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
740 /*************************************************
741 * Show supported features *
742 *************************************************/
744 /* This function is called for -bV/--version and for -d to output the optional
745 features of the current Exim binary.
747 Arguments: a FILE for printing
752 show_whats_supported(FILE *f)
756 #ifdef DB_VERSION_STRING
757 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
758 #elif defined(BTREEVERSION) && defined(HASHVERSION)
760 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
762 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
764 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
765 fprintf(f, "Probably ndbm\n");
766 #elif defined(USE_TDB)
767 fprintf(f, "Using tdb\n");
770 fprintf(f, "Probably GDBM (native mode)\n");
772 fprintf(f, "Probably GDBM (compatibility mode)\n");
776 fprintf(f, "Support for:");
777 #ifdef SUPPORT_CRYPTEQ
778 fprintf(f, " crypteq");
781 fprintf(f, " iconv()");
786 #ifdef HAVE_SETCLASSRESOURCES
787 fprintf(f, " use_setclassresources");
796 fprintf(f, " Expand_dlfunc");
798 #ifdef USE_TCP_WRAPPERS
799 fprintf(f, " TCPwrappers");
803 fprintf(f, " GnuTLS");
805 fprintf(f, " OpenSSL");
808 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
809 fprintf(f, " translate_ip_address");
811 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
812 fprintf(f, " move_frozen_messages");
814 #ifdef WITH_CONTENT_SCAN
815 fprintf(f, " Content_Scanning");
820 #ifdef WITH_OLD_DEMIME
821 fprintf(f, " Old_Demime");
823 #ifndef DISABLE_DNSSEC
824 fprintf(f, " DNSSEC");
832 #ifdef EXPERIMENTAL_SPF
833 fprintf(f, " Experimental_SPF");
835 #ifdef EXPERIMENTAL_SRS
836 fprintf(f, " Experimental_SRS");
838 #ifdef EXPERIMENTAL_BRIGHTMAIL
839 fprintf(f, " Experimental_Brightmail");
841 #ifdef EXPERIMENTAL_DANE
842 fprintf(f, " Experimental_DANE");
844 #ifdef EXPERIMENTAL_DCC
845 fprintf(f, " Experimental_DCC");
847 #ifdef EXPERIMENTAL_DMARC
848 fprintf(f, " Experimental_DMARC");
850 #ifdef EXPERIMENTAL_DSN_INFO
851 fprintf(f, " Experimental_DSN_info");
853 #ifdef EXPERIMENTAL_INTERNATIONAL
854 fprintf(f, " Experimental_International");
856 #ifdef EXPERIMENTAL_PROXY
857 fprintf(f, " Experimental_Proxy");
859 #ifdef EXPERIMENTAL_EVENT
860 fprintf(f, " Experimental_Event");
862 #ifdef EXPERIMENTAL_REDIS
863 fprintf(f, " Experimental_Redis");
865 #ifdef EXPERIMENTAL_SOCKS
866 fprintf(f, " Experimental_SOCKS");
870 fprintf(f, "Lookups (built-in):");
871 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
872 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
874 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
877 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
878 fprintf(f, " dbm dbmjz dbmnz");
880 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
881 fprintf(f, " dnsdb");
883 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
884 fprintf(f, " dsearch");
886 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
887 fprintf(f, " ibase");
889 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
890 fprintf(f, " ldap ldapdn ldapm");
892 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
893 fprintf(f, " mysql");
895 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
896 fprintf(f, " nis nis0");
898 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
899 fprintf(f, " nisplus");
901 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
902 fprintf(f, " oracle");
904 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
905 fprintf(f, " passwd");
907 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
908 fprintf(f, " pgsql");
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);
1034 #ifdef EXPERIMENTAL_INTERNATIONAL
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 local_queue_only;
1497 BOOL one_msg_action = FALSE;
1498 BOOL queue_only_set = FALSE;
1499 BOOL receiving_message = TRUE;
1500 BOOL sender_ident_set = FALSE;
1501 BOOL session_local_queue_only;
1503 BOOL removed_privilege = FALSE;
1504 BOOL usage_wanted = FALSE;
1505 BOOL verify_address_mode = FALSE;
1506 BOOL verify_as_sender = FALSE;
1507 BOOL version_printed = FALSE;
1508 uschar *alias_arg = NULL;
1509 uschar *called_as = US"";
1510 uschar *cmdline_syslog_name = NULL;
1511 uschar *start_queue_run_id = NULL;
1512 uschar *stop_queue_run_id = NULL;
1513 uschar *expansion_test_message = NULL;
1514 uschar *ftest_domain = NULL;
1515 uschar *ftest_localpart = NULL;
1516 uschar *ftest_prefix = NULL;
1517 uschar *ftest_suffix = NULL;
1518 uschar *log_oneline = NULL;
1519 uschar *malware_test_file = NULL;
1520 uschar *real_sender_address;
1521 uschar *originator_home = US"/";
1526 struct stat statbuf;
1527 pid_t passed_qr_pid = (pid_t)0;
1528 int passed_qr_pipe = -1;
1529 gid_t group_list[NGROUPS_MAX];
1531 /* For the -bI: flag */
1532 enum commandline_info info_flag = CMDINFO_NONE;
1533 BOOL info_stdout = FALSE;
1535 /* Possible options for -R and -S */
1537 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1539 /* Need to define this in case we need to change the environment in order
1540 to get rid of a bogus time zone. We have to make it char rather than uschar
1541 because some OS define it in /usr/include/unistd.h. */
1543 extern char **environ;
1545 /* If the Exim user and/or group and/or the configuration file owner/group were
1546 defined by ref:name at build time, we must now find the actual uid/gid values.
1547 This is a feature to make the lives of binary distributors easier. */
1549 #ifdef EXIM_USERNAME
1550 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1554 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1558 /* If ref:name uses a number as the name, route_finduser() returns
1559 TRUE with exim_uid set and pw coerced to NULL. */
1561 exim_gid = pw->pw_gid;
1562 #ifndef EXIM_GROUPNAME
1566 "exim: ref:name should specify a usercode, not a group.\n"
1567 "exim: can't let you get away with it unless you also specify a group.\n");
1574 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1580 #ifdef EXIM_GROUPNAME
1581 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1583 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1589 #ifdef CONFIGURE_OWNERNAME
1590 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1592 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1593 CONFIGURE_OWNERNAME);
1598 /* We default the system_filter_user to be the Exim run-time user, as a
1599 sane non-root value. */
1600 system_filter_uid = exim_uid;
1602 #ifdef CONFIGURE_GROUPNAME
1603 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1605 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1606 CONFIGURE_GROUPNAME);
1611 /* In the Cygwin environment, some initialization needs doing. It is fudged
1612 in by means of this macro. */
1618 /* Check a field which is patched when we are running Exim within its
1619 testing harness; do a fast initial check, and then the whole thing. */
1621 running_in_test_harness =
1622 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1624 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1625 at the start of a program; however, it seems that some environments do not
1626 follow this. A "strange" locale can affect the formatting of timestamps, so we
1629 setlocale(LC_ALL, "C");
1631 /* Set up the default handler for timing using alarm(). */
1633 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1635 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1636 because store_malloc writes a log entry on failure. */
1638 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1639 if (log_buffer == NULL)
1641 fprintf(stderr, "exim: failed to get store for log buffer\n");
1645 /* Initialize the default log options. */
1647 bits_set(log_selector, log_selector_size, log_default);
1649 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1650 NULL when the daemon is run and the file is closed. We have to use this
1651 indirection, because some systems don't allow writing to the variable "stderr".
1654 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1656 /* Arrange for the PCRE regex library to use our store functions. Note that
1657 the normal calls are actually macros that add additional arguments for
1658 debugging purposes so we have to assign specially constructed functions here.
1659 The default is to use store in the stacking pool, but this is overridden in the
1660 regex_must_compile() function. */
1662 pcre_malloc = function_store_get;
1663 pcre_free = function_dummy_free;
1665 /* Ensure there is a big buffer for temporary use in several places. It is put
1666 in malloc store so that it can be freed for enlargement if necessary. */
1668 big_buffer = store_malloc(big_buffer_size);
1670 /* Set up the handler for the data request signal, and set the initial
1671 descriptive text. */
1673 set_process_info("initializing");
1674 os_restarting_signal(SIGUSR1, usr1_handler);
1676 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1677 in the daemon code. For the rest of Exim's uses, we ignore it. */
1679 signal(SIGHUP, SIG_IGN);
1681 /* We don't want to die on pipe errors as the code is written to handle
1682 the write error instead. */
1684 signal(SIGPIPE, SIG_IGN);
1686 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1687 set to SIG_IGN. This causes subprocesses that complete before the parent
1688 process waits for them not to hang around, so when Exim calls wait(), nothing
1689 is there. The wait() code has been made robust against this, but let's ensure
1690 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1691 ending status. We use sigaction rather than plain signal() on those OS where
1692 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1693 problem on AIX with this.) */
1697 struct sigaction act;
1698 act.sa_handler = SIG_DFL;
1699 sigemptyset(&(act.sa_mask));
1701 sigaction(SIGCHLD, &act, NULL);
1704 signal(SIGCHLD, SIG_DFL);
1707 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1712 /* Set up the version number. Set up the leading 'E' for the external form of
1713 message ids, set the pointer to the internal form, and initialize it to
1714 indicate no message being processed. */
1717 message_id_option[0] = '-';
1718 message_id_external = message_id_option + 1;
1719 message_id_external[0] = 'E';
1720 message_id = message_id_external + 1;
1723 /* Set the umask to zero so that any files Exim creates using open() are
1724 created with the modes that it specifies. NOTE: Files created with fopen() have
1725 a problem, which was not recognized till rather late (February 2006). With this
1726 umask, such files will be world writeable. (They are all content scanning files
1727 in the spool directory, which isn't world-accessible, so this is not a
1728 disaster, but it's untidy.) I don't want to change this overall setting,
1729 however, because it will interact badly with the open() calls. Instead, there's
1730 now a function called modefopen() that fiddles with the umask while calling
1735 /* Precompile the regular expression for matching a message id. Keep this in
1736 step with the code that generates ids in the accept.c module. We need to do
1737 this here, because the -M options check their arguments for syntactic validity
1738 using mac_ismsgid, which uses this. */
1741 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1743 /* Precompile the regular expression that is used for matching an SMTP error
1744 code, possibly extended, at the start of an error message. Note that the
1745 terminating whitespace character is included. */
1748 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1751 #ifdef WHITELIST_D_MACROS
1752 /* Precompile the regular expression used to filter the content of macros
1753 given to -D for permissibility. */
1755 regex_whitelisted_macro =
1756 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1759 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1762 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1763 this seems to be a generally accepted convention, since one finds symbolic
1764 links called "mailq" in standard OS configurations. */
1766 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1767 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1770 receiving_message = FALSE;
1771 called_as = US"-mailq";
1774 /* If the program is called as "rmail" treat it as equivalent to
1775 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1776 i.e. preventing a single dot on a line from terminating the message, and
1777 returning with zero return code, even in cases of error (provided an error
1778 message has been sent). */
1780 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1781 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1784 called_as = US"-rmail";
1785 errors_sender_rc = EXIT_SUCCESS;
1788 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1789 this is a smail convention. */
1791 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1792 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1794 smtp_input = smtp_batched_input = TRUE;
1795 called_as = US"-rsmtp";
1798 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1799 this is a smail convention. */
1801 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1802 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1805 receiving_message = FALSE;
1806 called_as = US"-runq";
1809 /* If the program is called as "newaliases" treat it as equivalent to
1810 "exim -bi"; this is a sendmail convention. */
1812 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1813 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1816 receiving_message = FALSE;
1817 called_as = US"-newaliases";
1820 /* Save the original effective uid for a couple of uses later. It should
1821 normally be root, but in some esoteric environments it may not be. */
1823 original_euid = geteuid();
1825 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1826 to be the same as the real ones. This makes a difference only if Exim is setuid
1827 (or setgid) to something other than root, which could be the case in some
1828 special configurations. */
1830 real_uid = getuid();
1831 real_gid = getgid();
1833 if (real_uid == root_uid)
1835 rv = setgid(real_gid);
1838 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1839 (long int)real_gid, strerror(errno));
1842 rv = setuid(real_uid);
1845 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1846 (long int)real_uid, strerror(errno));
1851 /* If neither the original real uid nor the original euid was root, Exim is
1852 running in an unprivileged state. */
1854 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1856 /* Scan the program's arguments. Some can be dealt with right away; others are
1857 simply recorded for checking and handling afterwards. Do a high-level switch
1858 on the second character (the one after '-'), to save some effort. */
1860 for (i = 1; i < argc; i++)
1862 BOOL badarg = FALSE;
1863 uschar *arg = argv[i];
1867 /* An argument not starting with '-' is the start of a recipients list;
1868 break out of the options-scanning loop. */
1876 /* An option consistion of -- terminates the options */
1878 if (Ustrcmp(arg, "--") == 0)
1880 recipients_arg = i + 1;
1884 /* Handle flagged options */
1886 switchchar = arg[1];
1889 /* Make all -ex options synonymous with -oex arguments, since that
1890 is assumed by various callers. Also make -qR options synonymous with -R
1891 options, as that seems to be required as well. Allow for -qqR too, and
1892 the same for -S options. */
1894 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1895 Ustrncmp(arg+1, "qR", 2) == 0 ||
1896 Ustrncmp(arg+1, "qS", 2) == 0)
1898 switchchar = arg[2];
1901 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1903 switchchar = arg[3];
1905 queue_2stage = TRUE;
1908 /* Make -r synonymous with -f, since it is a documented alias */
1910 else if (arg[1] == 'r') switchchar = 'f';
1912 /* Make -ov synonymous with -v */
1914 else if (Ustrcmp(arg, "-ov") == 0)
1920 /* deal with --option_aliases */
1921 else if (switchchar == '-')
1923 if (Ustrcmp(argrest, "help") == 0)
1925 usage_wanted = TRUE;
1928 else if (Ustrcmp(argrest, "version") == 0)
1935 /* High-level switch on active initial letter */
1940 /* sendmail uses -Ac and -Am to control which .cf file is used;
1943 if (*argrest == '\0') { badarg = TRUE; break; }
1946 BOOL ignore = FALSE;
1951 if (*(argrest + 1) == '\0')
1955 if (!ignore) { badarg = TRUE; break; }
1959 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1960 so has no need of it. */
1963 if (*argrest == 0) i++; /* Skip over the type */
1968 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1970 /* -bd: Run in daemon mode, awaiting SMTP connections.
1971 -bdf: Ditto, but in the foreground.
1974 if (*argrest == 'd')
1976 daemon_listen = TRUE;
1977 if (*(++argrest) == 'f') background_daemon = FALSE;
1978 else if (*argrest != 0) { badarg = TRUE; break; }
1981 /* -be: Run in expansion test mode
1982 -bem: Ditto, but read a message from a file first
1985 else if (*argrest == 'e')
1987 expansion_test = checking = TRUE;
1988 if (argrest[1] == 'm')
1990 if (++i >= argc) { badarg = TRUE; break; }
1991 expansion_test_message = argv[i];
1994 if (argrest[1] != 0) { badarg = TRUE; break; }
1997 /* -bF: Run system filter test */
1999 else if (*argrest == 'F')
2001 filter_test |= FTEST_SYSTEM;
2002 if (*(++argrest) != 0) { badarg = TRUE; break; }
2003 if (++i < argc) filter_test_sfile = argv[i]; else
2005 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2010 /* -bf: Run user filter test
2011 -bfd: Set domain for filter testing
2012 -bfl: Set local part for filter testing
2013 -bfp: Set prefix for filter testing
2014 -bfs: Set suffix for filter testing
2017 else if (*argrest == 'f')
2019 if (*(++argrest) == 0)
2021 filter_test |= FTEST_USER;
2022 if (++i < argc) filter_test_ufile = argv[i]; else
2024 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2032 fprintf(stderr, "exim: string expected after %s\n", arg);
2035 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2036 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2037 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2038 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2039 else { badarg = TRUE; break; }
2043 /* -bh: Host checking - an IP address must follow. */
2045 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2047 if (++i >= argc) { badarg = TRUE; break; }
2048 sender_host_address = argv[i];
2049 host_checking = checking = log_testing_mode = TRUE;
2050 host_checking_callout = argrest[1] == 'c';
2053 /* -bi: This option is used by sendmail to initialize *the* alias file,
2054 though it has the -oA option to specify a different file. Exim has no
2055 concept of *the* alias file, but since Sun's YP make script calls
2056 sendmail this way, some support must be provided. */
2058 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2060 /* -bI: provide information, of the type to follow after a colon.
2061 This is an Exim flag. */
2063 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2065 uschar *p = &argrest[2];
2066 info_flag = CMDINFO_HELP;
2069 if (strcmpic(p, CUS"sieve") == 0)
2071 info_flag = CMDINFO_SIEVE;
2074 else if (strcmpic(p, CUS"dscp") == 0)
2076 info_flag = CMDINFO_DSCP;
2079 else if (strcmpic(p, CUS"help") == 0)
2086 /* -bm: Accept and deliver message - the default option. Reinstate
2087 receiving_message, which got turned off for all -b options. */
2089 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2091 /* -bmalware: test the filename given for malware */
2093 else if (Ustrcmp(argrest, "malware") == 0)
2095 if (++i >= argc) { badarg = TRUE; break; }
2096 malware_test_file = argv[i];
2099 /* -bnq: For locally originating messages, do not qualify unqualified
2100 addresses. In the envelope, this causes errors; in header lines they
2103 else if (Ustrcmp(argrest, "nq") == 0)
2105 allow_unqualified_sender = FALSE;
2106 allow_unqualified_recipient = FALSE;
2109 /* -bpxx: List the contents of the mail queue, in various forms. If
2110 the option is -bpc, just a queue count is needed. Otherwise, if the
2111 first letter after p is r, then order is random. */
2113 else if (*argrest == 'p')
2115 if (*(++argrest) == 'c')
2118 if (*(++argrest) != 0) badarg = TRUE;
2122 if (*argrest == 'r')
2124 list_queue_option = 8;
2127 else list_queue_option = 0;
2131 /* -bp: List the contents of the mail queue, top-level only */
2133 if (*argrest == 0) {}
2135 /* -bpu: List the contents of the mail queue, top-level undelivered */
2137 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2139 /* -bpa: List the contents of the mail queue, including all delivered */
2141 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2143 /* Unknown after -bp[r] */
2153 /* -bP: List the configuration variables given as the address list.
2154 Force -v, so configuration errors get displayed. */
2156 else if (Ustrcmp(argrest, "P") == 0)
2158 list_options = TRUE;
2159 debug_selector |= D_v;
2160 debug_file = stderr;
2163 /* -brt: Test retry configuration lookup */
2165 else if (Ustrcmp(argrest, "rt") == 0)
2167 test_retry_arg = i + 1;
2171 /* -brw: Test rewrite configuration */
2173 else if (Ustrcmp(argrest, "rw") == 0)
2175 test_rewrite_arg = i + 1;
2179 /* -bS: Read SMTP commands on standard input, but produce no replies -
2180 all errors are reported by sending messages. */
2182 else if (Ustrcmp(argrest, "S") == 0)
2183 smtp_input = smtp_batched_input = receiving_message = TRUE;
2185 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2186 on standard output. */
2188 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2190 /* -bt: address testing mode */
2192 else if (Ustrcmp(argrest, "t") == 0)
2193 address_test_mode = checking = log_testing_mode = TRUE;
2195 /* -bv: verify addresses */
2197 else if (Ustrcmp(argrest, "v") == 0)
2198 verify_address_mode = checking = log_testing_mode = TRUE;
2200 /* -bvs: verify sender addresses */
2202 else if (Ustrcmp(argrest, "vs") == 0)
2204 verify_address_mode = checking = log_testing_mode = TRUE;
2205 verify_as_sender = TRUE;
2208 /* -bV: Print version string and support details */
2210 else if (Ustrcmp(argrest, "V") == 0)
2212 printf("Exim version %s #%s built %s\n", version_string,
2213 version_cnumber, version_date);
2214 printf("%s\n", CS version_copyright);
2215 version_printed = TRUE;
2216 show_whats_supported(stdout);
2219 /* -bw: inetd wait mode, accept a listening socket as stdin */
2221 else if (*argrest == 'w')
2223 inetd_wait_mode = TRUE;
2224 background_daemon = FALSE;
2225 daemon_listen = TRUE;
2226 if (*(++argrest) != '\0')
2228 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2229 if (inetd_wait_timeout <= 0)
2231 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2241 /* -C: change configuration file list; ignore if it isn't really
2242 a change! Enforce a prefix check if required. */
2247 if(++i < argc) argrest = argv[i]; else
2248 { badarg = TRUE; break; }
2250 if (Ustrcmp(config_main_filelist, argrest) != 0)
2252 #ifdef ALT_CONFIG_PREFIX
2254 int len = Ustrlen(ALT_CONFIG_PREFIX);
2255 uschar *list = argrest;
2257 while((filename = string_nextinlist(&list, &sep, big_buffer,
2258 big_buffer_size)) != NULL)
2260 if ((Ustrlen(filename) < len ||
2261 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2262 Ustrstr(filename, "/../") != NULL) &&
2263 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2265 fprintf(stderr, "-C Permission denied\n");
2270 if (real_uid != root_uid)
2272 #ifdef TRUSTED_CONFIG_LIST
2274 if (real_uid != exim_uid
2275 #ifdef CONFIGURE_OWNER
2276 && real_uid != config_uid
2279 trusted_config = FALSE;
2282 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2285 struct stat statbuf;
2287 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2288 (statbuf.st_uid != root_uid /* owner not root */
2289 #ifdef CONFIGURE_OWNER
2290 && statbuf.st_uid != config_uid /* owner not the special one */
2293 (statbuf.st_gid != root_gid /* group not root */
2294 #ifdef CONFIGURE_GROUP
2295 && statbuf.st_gid != config_gid /* group not the special one */
2297 && (statbuf.st_mode & 020) != 0 /* group writeable */
2299 (statbuf.st_mode & 2) != 0) /* world writeable */
2301 trusted_config = FALSE;
2306 /* Well, the trust list at least is up to scratch... */
2307 void *reset_point = store_get(0);
2308 uschar *trusted_configs[32];
2312 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2314 uschar *start = big_buffer, *nl;
2315 while (*start && isspace(*start))
2319 nl = Ustrchr(start, '\n');
2322 trusted_configs[nr_configs++] = string_copy(start);
2323 if (nr_configs == 32)
2331 const uschar *list = argrest;
2333 while (trusted_config && (filename = string_nextinlist(&list,
2334 &sep, big_buffer, big_buffer_size)) != NULL)
2336 for (i=0; i < nr_configs; i++)
2338 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2341 if (i == nr_configs)
2343 trusted_config = FALSE;
2347 store_reset(reset_point);
2351 /* No valid prefixes found in trust_list file. */
2352 trusted_config = FALSE;
2358 /* Could not open trust_list file. */
2359 trusted_config = FALSE;
2363 /* Not root; don't trust config */
2364 trusted_config = FALSE;
2368 config_main_filelist = argrest;
2369 config_changed = TRUE;
2374 /* -D: set up a macro definition */
2377 #ifdef DISABLE_D_OPTION
2378 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2383 macro_item *mlast = NULL;
2386 uschar *s = argrest;
2388 while (isspace(*s)) s++;
2390 if (*s < 'A' || *s > 'Z')
2392 fprintf(stderr, "exim: macro name set by -D must start with "
2393 "an upper case letter\n");
2397 while (isalnum(*s) || *s == '_')
2399 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2403 if (ptr == 0) { badarg = TRUE; break; }
2404 while (isspace(*s)) s++;
2407 if (*s++ != '=') { badarg = TRUE; break; }
2408 while (isspace(*s)) s++;
2411 for (m = macros; m != NULL; m = m->next)
2413 if (Ustrcmp(m->name, name) == 0)
2415 fprintf(stderr, "exim: duplicated -D in command line\n");
2421 m = store_get(sizeof(macro_item) + Ustrlen(name));
2423 m->command_line = TRUE;
2424 if (mlast == NULL) macros = m; else mlast->next = m;
2425 Ustrcpy(m->name, name);
2426 m->replacement = string_copy(s);
2428 if (clmacro_count >= MAX_CLMACROS)
2430 fprintf(stderr, "exim: too many -D options on command line\n");
2433 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2439 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2440 The latter is now a no-op, retained for compatibility only. If -dd is used,
2441 debugging subprocesses of the daemon is disabled. */
2444 if (Ustrcmp(argrest, "ropcr") == 0)
2446 /* drop_cr = TRUE; */
2449 /* Use an intermediate variable so that we don't set debugging while
2450 decoding the debugging bits. */
2454 unsigned int selector = D_default;
2457 if (*argrest == 'd')
2459 debug_daemon = TRUE;
2463 decode_bits(&selector, 1, debug_notall, argrest,
2464 debug_options, debug_options_count, US"debug", 0);
2465 debug_selector = selector;
2470 /* -E: This is a local error message. This option is not intended for
2471 external use at all, but is not restricted to trusted callers because it
2472 does no harm (just suppresses certain error messages) and if Exim is run
2473 not setuid root it won't always be trusted when it generates error
2474 messages using this option. If there is a message id following -E, point
2475 message_reference at it, for logging. */
2478 local_error_message = TRUE;
2479 if (mac_ismsgid(argrest)) message_reference = argrest;
2483 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2484 option, so it looks as if historically the -oex options are also callable
2485 without the leading -o. So we have to accept them. Before the switch,
2486 anything starting -oe has been converted to -e. Exim does not support all
2487 of the sendmail error options. */
2490 if (Ustrcmp(argrest, "e") == 0)
2492 arg_error_handling = ERRORS_SENDER;
2493 errors_sender_rc = EXIT_SUCCESS;
2495 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2496 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2497 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2498 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2503 /* -F: Set sender's full name, used instead of the gecos entry from
2504 the password file. Since users can usually alter their gecos entries,
2505 there's no security involved in using this instead. The data can follow
2506 the -F or be in the next argument. */
2511 if(++i < argc) argrest = argv[i]; else
2512 { badarg = TRUE; break; }
2514 originator_name = argrest;
2515 sender_name_forced = TRUE;
2519 /* -f: Set sender's address - this value is only actually used if Exim is
2520 run by a trusted user, or if untrusted_set_sender is set and matches the
2521 address, except that the null address can always be set by any user. The
2522 test for this happens later, when the value given here is ignored when not
2523 permitted. For an untrusted user, the actual sender is still put in Sender:
2524 if it doesn't match the From: header (unless no_local_from_check is set).
2525 The data can follow the -f or be in the next argument. The -r switch is an
2526 obsolete form of -f but since there appear to be programs out there that
2527 use anything that sendmail has ever supported, better accept it - the
2528 synonymizing is done before the switch above.
2530 At this stage, we must allow domain literal addresses, because we don't
2531 know what the setting of allow_domain_literals is yet. Ditto for trailing
2532 dots and strip_trailing_dot. */
2536 int dummy_start, dummy_end;
2540 if (i+1 < argc) argrest = argv[++i]; else
2541 { badarg = TRUE; break; }
2544 sender_address = string_sprintf(""); /* Ensure writeable memory */
2547 uschar *temp = argrest + Ustrlen(argrest) - 1;
2548 while (temp >= argrest && isspace(*temp)) temp--;
2549 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2550 allow_domain_literals = TRUE;
2551 strip_trailing_dot = TRUE;
2552 #ifdef EXPERIMENTAL_INTERNATIONAL
2553 allow_utf8_domains = TRUE;
2555 sender_address = parse_extract_address(argrest, &errmess,
2556 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2557 #ifdef EXPERIMENTAL_INTERNATIONAL
2558 message_smtputf8 = string_is_utf8(sender_address);
2559 allow_utf8_domains = FALSE;
2561 allow_domain_literals = FALSE;
2562 strip_trailing_dot = FALSE;
2563 if (sender_address == NULL)
2565 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2566 return EXIT_FAILURE;
2569 sender_address_forced = TRUE;
2573 /* -G: sendmail invocation to specify that it's a gateway submission and
2574 sendmail may complain about problems instead of fixing them.
2575 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2576 not at this time complain about problems. */
2582 /* -h: Set the hop count for an incoming message. Exim does not currently
2583 support this; it always computes it by counting the Received: headers.
2584 To put it in will require a change to the spool header file format. */
2589 if(++i < argc) argrest = argv[i]; else
2590 { badarg = TRUE; break; }
2592 if (!isdigit(*argrest)) badarg = TRUE;
2596 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2597 not to be documented for sendmail but mailx (at least) uses it) */
2600 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2604 /* -L: set the identifier used for syslog; equivalent to setting
2605 syslog_processname in the config file, but needs to be an admin option. */
2608 if (*argrest == '\0')
2610 if(++i < argc) argrest = argv[i]; else
2611 { badarg = TRUE; break; }
2613 sz = Ustrlen(argrest);
2616 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2617 return EXIT_FAILURE;
2621 fprintf(stderr, "exim: the -L syslog name is too short\n");
2622 return EXIT_FAILURE;
2624 cmdline_syslog_name = argrest;
2628 receiving_message = FALSE;
2630 /* -MC: continue delivery of another message via an existing open
2631 file descriptor. This option is used for an internal call by the
2632 smtp transport when there is a pending message waiting to go to an
2633 address to which it has got a connection. Five subsequent arguments are
2634 required: transport name, host name, IP address, sequence number, and
2635 message_id. Transports may decline to create new processes if the sequence
2636 number gets too big. The channel is stdin. This (-MC) must be the last
2637 argument. There's a subsequent check that the real-uid is privileged.
2639 If we are running in the test harness. delay for a bit, to let the process
2640 that set this one up complete. This makes for repeatability of the logging,
2643 if (Ustrcmp(argrest, "C") == 0)
2645 union sockaddr_46 interface_sock;
2646 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2650 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2651 return EXIT_FAILURE;
2654 if (msg_action_arg >= 0)
2656 fprintf(stderr, "exim: incompatible arguments\n");
2657 return EXIT_FAILURE;
2660 continue_transport = argv[++i];
2661 continue_hostname = argv[++i];
2662 continue_host_address = argv[++i];
2663 continue_sequence = Uatoi(argv[++i]);
2664 msg_action = MSG_DELIVER;
2665 msg_action_arg = ++i;
2666 forced_delivery = TRUE;
2667 queue_run_pid = passed_qr_pid;
2668 queue_run_pipe = passed_qr_pipe;
2670 if (!mac_ismsgid(argv[i]))
2672 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2674 return EXIT_FAILURE;
2677 /* Set up $sending_ip_address and $sending_port */
2679 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2681 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2685 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2687 return EXIT_FAILURE;
2690 if (running_in_test_harness) millisleep(500);
2694 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2695 precedes -MC (see above). The flag indicates that the host to which
2696 Exim is connected has accepted an AUTH sequence. */
2698 else if (Ustrcmp(argrest, "CA") == 0)
2700 smtp_authenticated = TRUE;
2704 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2705 that exim is connected to supports the esmtp extension DSN */
2706 else if (Ustrcmp(argrest, "CD") == 0)
2708 smtp_use_dsn = TRUE;
2712 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2713 it preceded -MC (see above) */
2715 else if (Ustrcmp(argrest, "CP") == 0)
2717 smtp_use_pipelining = TRUE;
2721 /* -MCQ: pass on the pid of the queue-running process that started
2722 this chain of deliveries and the fd of its synchronizing pipe; this
2723 is useful only when it precedes -MC (see above) */
2725 else if (Ustrcmp(argrest, "CQ") == 0)
2727 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2729 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2734 /* -MCS: set the smtp_use_size flag; this is useful only when it
2735 precedes -MC (see above) */
2737 else if (Ustrcmp(argrest, "CS") == 0)
2739 smtp_use_size = TRUE;
2743 /* -MCT: set the tls_offered flag; this is useful only when it
2744 precedes -MC (see above). The flag indicates that the host to which
2745 Exim is connected has offered TLS support. */
2748 else if (Ustrcmp(argrest, "CT") == 0)
2755 /* -M[x]: various operations on the following list of message ids:
2756 -M deliver the messages, ignoring next retry times and thawing
2757 -Mc deliver the messages, checking next retry times, no thawing
2758 -Mf freeze the messages
2759 -Mg give up on the messages
2760 -Mt thaw the messages
2761 -Mrm remove the messages
2762 In the above cases, this must be the last option. There are also the
2763 following options which are followed by a single message id, and which
2764 act on that message. Some of them use the "recipient" addresses as well.
2765 -Mar add recipient(s)
2766 -Mmad mark all recipients delivered
2767 -Mmd mark recipients(s) delivered
2769 -Mset load a message for use with -be
2771 -Mvc show copy (of whole message, in RFC 2822 format)
2776 else if (*argrest == 0)
2778 msg_action = MSG_DELIVER;
2779 forced_delivery = deliver_force_thaw = TRUE;
2781 else if (Ustrcmp(argrest, "ar") == 0)
2783 msg_action = MSG_ADD_RECIPIENT;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2787 else if (Ustrcmp(argrest, "es") == 0)
2789 msg_action = MSG_EDIT_SENDER;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2793 else if (Ustrcmp(argrest, "g") == 0)
2795 msg_action = MSG_DELIVER;
2796 deliver_give_up = TRUE;
2798 else if (Ustrcmp(argrest, "mad") == 0)
2800 msg_action = MSG_MARK_ALL_DELIVERED;
2802 else if (Ustrcmp(argrest, "md") == 0)
2804 msg_action = MSG_MARK_DELIVERED;
2805 one_msg_action = TRUE;
2807 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2808 else if (Ustrcmp(argrest, "set") == 0)
2810 msg_action = MSG_LOAD;
2811 one_msg_action = TRUE;
2813 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2814 else if (Ustrcmp(argrest, "vb") == 0)
2816 msg_action = MSG_SHOW_BODY;
2817 one_msg_action = TRUE;
2819 else if (Ustrcmp(argrest, "vc") == 0)
2821 msg_action = MSG_SHOW_COPY;
2822 one_msg_action = TRUE;
2824 else if (Ustrcmp(argrest, "vh") == 0)
2826 msg_action = MSG_SHOW_HEADER;
2827 one_msg_action = TRUE;
2829 else if (Ustrcmp(argrest, "vl") == 0)
2831 msg_action = MSG_SHOW_LOG;
2832 one_msg_action = TRUE;
2834 else { badarg = TRUE; break; }
2836 /* All the -Mxx options require at least one message id. */
2838 msg_action_arg = i + 1;
2839 if (msg_action_arg >= argc)
2841 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2842 return EXIT_FAILURE;
2845 /* Some require only message ids to follow */
2847 if (!one_msg_action)
2850 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2852 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2854 return EXIT_FAILURE;
2856 goto END_ARG; /* Remaining args are ids */
2859 /* Others require only one message id, possibly followed by addresses,
2860 which will be handled as normal arguments. */
2864 if (!mac_ismsgid(argv[msg_action_arg]))
2866 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2867 argv[msg_action_arg], arg);
2868 return EXIT_FAILURE;
2875 /* Some programs seem to call the -om option without the leading o;
2876 for sendmail it askes for "me too". Exim always does this. */
2879 if (*argrest != 0) badarg = TRUE;
2883 /* -N: don't do delivery - a debugging option that stops transports doing
2884 their thing. It implies debugging at the D_v level. */
2889 dont_deliver = TRUE;
2890 debug_selector |= D_v;
2891 debug_file = stderr;
2897 /* -n: This means "don't alias" in sendmail, apparently.
2898 For normal invocations, it has no effect.
2899 It may affect some other options. */
2905 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2906 option to the specified value. This form uses long names. We need to handle
2907 -O option=value and -Ooption=value. */
2914 fprintf(stderr, "exim: string expected after -O\n");
2922 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2925 if (*argrest == 'A')
2927 alias_arg = argrest + 1;
2928 if (alias_arg[0] == 0)
2930 if (i+1 < argc) alias_arg = argv[++i]; else
2932 fprintf(stderr, "exim: string expected after -oA\n");
2938 /* -oB: Set a connection message max value for remote deliveries */
2940 else if (*argrest == 'B')
2942 uschar *p = argrest + 1;
2945 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2947 connection_max_messages = 1;
2956 fprintf(stderr, "exim: number expected after -oB\n");
2959 connection_max_messages = Uatoi(p);
2963 /* -odb: background delivery */
2965 else if (Ustrcmp(argrest, "db") == 0)
2967 synchronous_delivery = FALSE;
2968 arg_queue_only = FALSE;
2969 queue_only_set = TRUE;
2972 /* -odf: foreground delivery (smail-compatible option); same effect as
2973 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2976 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2978 synchronous_delivery = TRUE;
2979 arg_queue_only = FALSE;
2980 queue_only_set = TRUE;
2983 /* -odq: queue only */
2985 else if (Ustrcmp(argrest, "dq") == 0)
2987 synchronous_delivery = FALSE;
2988 arg_queue_only = TRUE;
2989 queue_only_set = TRUE;
2992 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2993 but no remote delivery */
2995 else if (Ustrcmp(argrest, "dqs") == 0)
2998 arg_queue_only = FALSE;
2999 queue_only_set = TRUE;
3002 /* -oex: Sendmail error flags. As these are also accepted without the
3003 leading -o prefix, for compatibility with vacation and other callers,
3004 they are handled with -e above. */
3006 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3007 -oitrue: Another sendmail syntax for the same */
3009 else if (Ustrcmp(argrest, "i") == 0 ||
3010 Ustrcmp(argrest, "itrue") == 0)
3013 /* -oM*: Set various characteristics for an incoming message; actually
3014 acted on for trusted callers only. */
3016 else if (*argrest == 'M')
3020 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3024 /* -oMa: Set sender host address */
3026 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3028 /* -oMaa: Set authenticator name */
3030 else if (Ustrcmp(argrest, "Maa") == 0)
3031 sender_host_authenticated = argv[++i];
3033 /* -oMas: setting authenticated sender */
3035 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3037 /* -oMai: setting authenticated id */
3039 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3041 /* -oMi: Set incoming interface address */
3043 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3045 /* -oMm: Message reference */
3047 else if (Ustrcmp(argrest, "Mm") == 0)
3049 if (!mac_ismsgid(argv[i+1]))
3051 fprintf(stderr,"-oMm must be a valid message ID\n");
3054 if (!trusted_config)
3056 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3059 message_reference = argv[++i];
3062 /* -oMr: Received protocol */
3064 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3066 /* -oMs: Set sender host name */
3068 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3070 /* -oMt: Set sender ident */
3072 else if (Ustrcmp(argrest, "Mt") == 0)
3074 sender_ident_set = TRUE;
3075 sender_ident = argv[++i];
3078 /* Else a bad argument */
3087 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3088 seem to call this as -m (undocumented), so that is also accepted (see
3091 else if (Ustrcmp(argrest, "m") == 0) {}
3093 /* -oo: An ancient flag for old-style addresses which still seems to
3094 crop up in some calls (see in SCO). */
3096 else if (Ustrcmp(argrest, "o") == 0) {}
3098 /* -oP <name>: set pid file path for daemon */
3100 else if (Ustrcmp(argrest, "P") == 0)
3101 override_pid_file_path = argv[++i];
3103 /* -or <n>: set timeout for non-SMTP acceptance
3104 -os <n>: set timeout for SMTP acceptance */
3106 else if (*argrest == 'r' || *argrest == 's')
3108 int *tp = (*argrest == 'r')?
3109 &arg_receive_timeout : &arg_smtp_receive_timeout;
3110 if (argrest[1] == 0)
3112 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3114 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3117 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3122 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3124 else if (Ustrcmp(argrest, "X") == 0)
3125 override_local_interfaces = argv[++i];
3127 /* Unknown -o argument */
3133 /* -ps: force Perl startup; -pd force delayed Perl startup */
3137 if (*argrest == 's' && argrest[1] == 0)
3139 perl_start_option = 1;
3142 if (*argrest == 'd' && argrest[1] == 0)
3144 perl_start_option = -1;
3149 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3150 which sets the host protocol and host name */
3154 if (i+1 < argc) argrest = argv[++i]; else
3155 { badarg = TRUE; break; }
3160 uschar *hn = Ustrchr(argrest, ':');
3163 received_protocol = argrest;
3167 received_protocol = string_copyn(argrest, hn - argrest);
3168 sender_host_name = hn + 1;
3175 receiving_message = FALSE;
3176 if (queue_interval >= 0)
3178 fprintf(stderr, "exim: -q specified more than once\n");
3182 /* -qq...: Do queue runs in a 2-stage manner */
3184 if (*argrest == 'q')
3186 queue_2stage = TRUE;
3190 /* -qi...: Do only first (initial) deliveries */
3192 if (*argrest == 'i')
3194 queue_run_first_delivery = TRUE;
3198 /* -qf...: Run the queue, forcing deliveries
3199 -qff..: Ditto, forcing thawing as well */
3201 if (*argrest == 'f')
3203 queue_run_force = TRUE;
3204 if (*(++argrest) == 'f')
3206 deliver_force_thaw = TRUE;
3211 /* -q[f][f]l...: Run the queue only on local deliveries */
3213 if (*argrest == 'l')
3215 queue_run_local = TRUE;
3219 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3220 optionally starting from a given message id. */
3222 if (*argrest == 0 &&
3223 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3226 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3227 start_queue_run_id = argv[++i];
3228 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3229 stop_queue_run_id = argv[++i];
3232 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3233 optionally local only. */
3238 queue_interval = readconf_readtime(argrest, 0, FALSE);
3240 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3241 if (queue_interval <= 0)
3243 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3250 case 'R': /* Synonymous with -qR... */
3251 receiving_message = FALSE;
3253 /* -Rf: As -R (below) but force all deliveries,
3254 -Rff: Ditto, but also thaw all frozen messages,
3255 -Rr: String is regex
3256 -Rrf: Regex and force
3257 -Rrff: Regex and force and thaw
3259 in all cases provided there are no further characters in this
3265 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3267 if (Ustrcmp(argrest, rsopts[i]) == 0)
3269 if (i != 2) queue_run_force = TRUE;
3270 if (i >= 2) deliver_selectstring_regex = TRUE;
3271 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3272 argrest += Ustrlen(rsopts[i]);
3277 /* -R: Set string to match in addresses for forced queue run to
3278 pick out particular messages. */
3282 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3284 fprintf(stderr, "exim: string expected after -R\n");
3288 else deliver_selectstring = argrest;
3292 /* -r: an obsolete synonym for -f (see above) */
3295 /* -S: Like -R but works on sender. */
3297 case 'S': /* Synonymous with -qS... */
3298 receiving_message = FALSE;
3300 /* -Sf: As -S (below) but force all deliveries,
3301 -Sff: Ditto, but also thaw all frozen messages,
3302 -Sr: String is regex
3303 -Srf: Regex and force
3304 -Srff: Regex and force and thaw
3306 in all cases provided there are no further characters in this
3312 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3314 if (Ustrcmp(argrest, rsopts[i]) == 0)
3316 if (i != 2) queue_run_force = TRUE;
3317 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3318 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3319 argrest += Ustrlen(rsopts[i]);
3324 /* -S: Set string to match in addresses for forced queue run to
3325 pick out particular messages. */
3329 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3331 fprintf(stderr, "exim: string expected after -S\n");
3335 else deliver_selectstring_sender = argrest;
3338 /* -Tqt is an option that is exclusively for use by the testing suite.
3339 It is not recognized in other circumstances. It allows for the setting up
3340 of explicit "queue times" so that various warning/retry things can be
3341 tested. Otherwise variability of clock ticks etc. cause problems. */
3344 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3345 fudged_queue_times = argv[++i];
3350 /* -t: Set flag to extract recipients from body of message. */
3353 if (*argrest == 0) extract_recipients = TRUE;
3355 /* -ti: Set flag to extract recipients from body of message, and also
3356 specify that dot does not end the message. */
3358 else if (Ustrcmp(argrest, "i") == 0)
3360 extract_recipients = TRUE;
3364 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3367 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3374 /* -U: This means "initial user submission" in sendmail, apparently. The
3375 doc claims that in future sendmail may refuse syntactically invalid
3376 messages instead of fixing them. For the moment, we just ignore it. */
3382 /* -v: verify things - this is a very low-level debugging */
3387 debug_selector |= D_v;
3388 debug_file = stderr;
3394 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3396 The -x flag tells the sendmail command that mail from a local
3397 mail program has National Language Support (NLS) extended characters
3398 in the body of the mail item. The sendmail command can send mail with
3399 extended NLS characters across networks that normally corrupts these
3402 As Exim is 8-bit clean, it just ignores this flag. */
3405 if (*argrest != 0) badarg = TRUE;
3408 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3409 logs to that file. We swallow the parameter and otherwise ignore it. */
3412 if (*argrest == '\0')
3415 fprintf(stderr, "exim: string expected after -X\n");
3421 if (*argrest == '\0')
3422 if (++i < argc) log_oneline = argv[i]; else
3424 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3429 /* All other initial characters are errors */
3434 } /* End of high-level switch statement */
3436 /* Failed to recognize the option, or syntax error */
3440 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3441 "option %s\n", arg);
3447 /* If -R or -S have been specified without -q, assume a single queue run. */
3449 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3450 queue_interval < 0) queue_interval = 0;
3454 /* If usage_wanted is set we call the usage function - which never returns */
3455 if (usage_wanted) exim_usage(called_as);
3457 /* Arguments have been processed. Check for incompatibilities. */
3459 (smtp_input || extract_recipients || recipients_arg < argc) &&
3460 (daemon_listen || queue_interval >= 0 || bi_option ||
3461 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3462 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3465 msg_action_arg > 0 &&
3466 (daemon_listen || queue_interval >= 0 || list_options ||
3467 (checking && msg_action != MSG_LOAD) ||
3468 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3471 (daemon_listen || queue_interval >= 0) &&
3472 (sender_address != NULL || list_options || list_queue || checking ||
3476 daemon_listen && queue_interval == 0
3479 inetd_wait_mode && queue_interval >= 0
3483 (checking || smtp_input || extract_recipients ||
3484 filter_test != FTEST_NONE || bi_option)
3487 verify_address_mode &&
3488 (address_test_mode || smtp_input || extract_recipients ||
3489 filter_test != FTEST_NONE || bi_option)
3492 address_test_mode && (smtp_input || extract_recipients ||
3493 filter_test != FTEST_NONE || bi_option)
3496 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3500 deliver_selectstring != NULL && queue_interval < 0
3503 msg_action == MSG_LOAD &&
3504 (!expansion_test || expansion_test_message != NULL)
3508 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3512 /* If debugging is set up, set the file and the file descriptor to pass on to
3513 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3514 to run in the foreground. */
3516 if (debug_selector != 0)
3518 debug_file = stderr;
3519 debug_fd = fileno(debug_file);
3520 background_daemon = FALSE;
3521 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3522 if (debug_selector != D_v) /* -v only doesn't show this */
3524 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3525 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3527 if (!version_printed)
3528 show_whats_supported(stderr);
3532 /* When started with root privilege, ensure that the limits on the number of
3533 open files and the number of processes (where that is accessible) are
3534 sufficiently large, or are unset, in case Exim has been called from an
3535 environment where the limits are screwed down. Not all OS have the ability to
3536 change some of these limits. */
3540 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3546 #ifdef RLIMIT_NOFILE
3547 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3549 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3551 rlp.rlim_cur = rlp.rlim_max = 0;
3554 /* I originally chose 1000 as a nice big number that was unlikely to
3555 be exceeded. It turns out that some older OS have a fixed upper limit of
3558 if (rlp.rlim_cur < 1000)
3560 rlp.rlim_cur = rlp.rlim_max = 1000;
3561 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3563 rlp.rlim_cur = rlp.rlim_max = 256;
3564 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3565 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3572 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3574 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3576 rlp.rlim_cur = rlp.rlim_max = 0;
3579 #ifdef RLIM_INFINITY
3580 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3582 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3584 if (rlp.rlim_cur < 1000)
3586 rlp.rlim_cur = rlp.rlim_max = 1000;
3588 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3589 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3595 /* Exim is normally entered as root (but some special configurations are
3596 possible that don't do this). However, it always spins off sub-processes that
3597 set their uid and gid as required for local delivery. We don't want to pass on
3598 any extra groups that root may belong to, so we want to get rid of them all at
3601 We need to obey setgroups() at this stage, before possibly giving up root
3602 privilege for a changed configuration file, but later on we might need to
3603 check on the additional groups for the admin user privilege - can't do that
3604 till after reading the config, which might specify the exim gid. Therefore,
3605 save the group list here first. */
3607 group_count = getgroups(NGROUPS_MAX, group_list);
3608 if (group_count < 0)
3610 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3614 /* There is a fundamental difference in some BSD systems in the matter of
3615 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3616 known not to be different. On the "different" systems there is a single group
3617 list, and the first entry in it is the current group. On all other versions of
3618 Unix there is a supplementary group list, which is in *addition* to the current
3619 group. Consequently, to get rid of all extraneous groups on a "standard" system
3620 you pass over 0 groups to setgroups(), while on a "different" system you pass
3621 over a single group - the current group, which is always the first group in the
3622 list. Calling setgroups() with zero groups on a "different" system results in
3623 an error return. The following code should cope with both types of system.
3625 However, if this process isn't running as root, setgroups() can't be used
3626 since you have to be root to run it, even if throwing away groups. Not being
3627 root here happens only in some unusual configurations. We just ignore the
3630 if (setgroups(0, NULL) != 0)
3632 if (setgroups(1, group_list) != 0 && !unprivileged)
3634 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3639 /* If the configuration file name has been altered by an argument on the
3640 command line (either a new file name or a macro definition) and the caller is
3641 not root, or if this is a filter testing run, remove any setuid privilege the
3642 program has and run as the underlying user.
3644 The exim user is locked out of this, which severely restricts the use of -C
3647 Otherwise, set the real ids to the effective values (should be root unless run
3648 from inetd, which it can either be root or the exim uid, if one is configured).
3650 There is a private mechanism for bypassing some of this, in order to make it
3651 possible to test lots of configurations automatically, without having either to
3652 recompile each time, or to patch in an actual configuration file name and other
3653 values (such as the path name). If running in the test harness, pretend that
3654 configuration file changes and macro definitions haven't happened. */
3657 (!trusted_config || /* Config changed, or */
3658 !macros_trusted()) && /* impermissible macros and */
3659 real_uid != root_uid && /* Not root, and */
3660 !running_in_test_harness /* Not fudged */
3662 expansion_test /* expansion testing */
3664 filter_test != FTEST_NONE) /* Filter testing */
3666 setgroups(group_count, group_list);
3667 exim_setugid(real_uid, real_gid, FALSE,
3668 US"-C, -D, -be or -bf forces real uid");
3669 removed_privilege = TRUE;
3671 /* In the normal case when Exim is called like this, stderr is available
3672 and should be used for any logging information because attempts to write
3673 to the log will usually fail. To arrange this, we unset really_exim. However,
3674 if no stderr is available there is no point - we might as well have a go
3675 at the log (if it fails, syslog will be written).
3677 Note that if the invoker is Exim, the logs remain available. Messing with
3678 this causes unlogged successful deliveries. */
3680 if ((log_stderr != NULL) && (real_uid != exim_uid))
3681 really_exim = FALSE;
3684 /* Privilege is to be retained for the moment. It may be dropped later,
3685 depending on the job that this Exim process has been asked to do. For now, set
3686 the real uid to the effective so that subsequent re-execs of Exim are done by a
3689 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3691 /* If testing a filter, open the file(s) now, before wasting time doing other
3692 setups and reading the message. */
3694 if ((filter_test & FTEST_SYSTEM) != 0)
3696 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3699 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3701 return EXIT_FAILURE;
3705 if ((filter_test & FTEST_USER) != 0)
3707 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3710 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3712 return EXIT_FAILURE;
3716 /* Initialise lookup_list
3717 If debugging, already called above via version reporting.
3718 In either case, we initialise the list of available lookups while running
3719 as root. All dynamically modules are loaded from a directory which is
3720 hard-coded into the binary and is code which, if not a module, would be
3721 part of Exim already. Ability to modify the content of the directory
3722 is equivalent to the ability to modify a setuid binary!
3724 This needs to happen before we read the main configuration. */
3727 #ifdef EXPERIMENTAL_INTERNATIONAL
3728 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3731 /* Read the main runtime configuration data; this gives up if there
3732 is a failure. It leaves the configuration file open so that the subsequent
3733 configuration data for delivery can be read if needed. */
3737 /* If an action on specific messages is requested, or if a daemon or queue
3738 runner is being started, we need to know if Exim was called by an admin user.
3739 This is the case if the real user is root or exim, or if the real group is
3740 exim, or if one of the supplementary groups is exim or a group listed in
3741 admin_groups. We don't fail all message actions immediately if not admin_user,
3742 since some actions can be performed by non-admin users. Instead, set admin_user
3743 for later interrogation. */
3745 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3750 for (i = 0; i < group_count; i++)
3752 if (group_list[i] == exim_gid) admin_user = TRUE;
3753 else if (admin_groups != NULL)
3755 for (j = 1; j <= (int)(admin_groups[0]); j++)
3756 if (admin_groups[j] == group_list[i])
3757 { admin_user = TRUE; break; }
3759 if (admin_user) break;
3763 /* Another group of privileged users are the trusted users. These are root,
3764 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3765 are permitted to specify sender_addresses with -f on the command line, and
3766 other message parameters as well. */
3768 if (real_uid == root_uid || real_uid == exim_uid)
3769 trusted_caller = TRUE;
3774 if (trusted_users != NULL)
3776 for (i = 1; i <= (int)(trusted_users[0]); i++)
3777 if (trusted_users[i] == real_uid)
3778 { trusted_caller = TRUE; break; }
3781 if (!trusted_caller && trusted_groups != NULL)
3783 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3785 if (trusted_groups[i] == real_gid)
3786 trusted_caller = TRUE;
3787 else for (j = 0; j < group_count; j++)
3789 if (trusted_groups[i] == group_list[j])
3790 { trusted_caller = TRUE; break; }
3792 if (trusted_caller) break;
3797 /* Handle the decoding of logging options. */
3799 decode_bits(log_selector, log_selector_size, log_notall,
3800 log_selector_string, log_options, log_options_count, US"log", 0);
3805 debug_printf("configuration file is %s\n", config_main_filename);
3806 debug_printf("log selectors =");
3807 for (i = 0; i < log_selector_size; i++)
3808 debug_printf(" %08x", log_selector[i]);
3812 /* If domain literals are not allowed, check the sender address that was
3813 supplied with -f. Ditto for a stripped trailing dot. */
3815 if (sender_address != NULL)
3817 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3819 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3820 "allowed\n", sender_address);
3821 return EXIT_FAILURE;
3823 if (f_end_dot && !strip_trailing_dot)
3825 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3826 "(trailing dot not allowed)\n", sender_address);
3827 return EXIT_FAILURE;
3831 /* See if an admin user overrode our logging. */
3833 if (cmdline_syslog_name != NULL)
3837 syslog_processname = cmdline_syslog_name;
3838 log_file_path = string_copy(CUS"syslog");
3842 /* not a panic, non-privileged users should not be able to spam paniclog */
3844 "exim: you lack sufficient privilege to specify syslog process name\n");
3845 return EXIT_FAILURE;
3849 /* Paranoia check of maximum lengths of certain strings. There is a check
3850 on the length of the log file path in log.c, which will come into effect
3851 if there are any calls to write the log earlier than this. However, if we
3852 get this far but the string is very long, it is better to stop now than to
3853 carry on and (e.g.) receive a message and then have to collapse. The call to
3854 log_write() from here will cause the ultimate panic collapse if the complete
3855 file name exceeds the buffer length. */
3857 if (Ustrlen(log_file_path) > 200)
3858 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3859 "log_file_path is longer than 200 chars: aborting");
3861 if (Ustrlen(pid_file_path) > 200)
3862 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3863 "pid_file_path is longer than 200 chars: aborting");
3865 if (Ustrlen(spool_directory) > 200)
3866 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3867 "spool_directory is longer than 200 chars: aborting");
3869 /* Length check on the process name given to syslog for its TAG field,
3870 which is only permitted to be 32 characters or less. See RFC 3164. */
3872 if (Ustrlen(syslog_processname) > 32)
3873 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3874 "syslog_processname is longer than 32 chars: aborting");
3880 log_write(0, LOG_MAIN, "%s", log_oneline);
3881 return EXIT_SUCCESS;
3884 return EXIT_FAILURE;
3887 /* In some operating systems, the environment variable TMPDIR controls where
3888 temporary files are created; Exim doesn't use these (apart from when delivering
3889 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3890 If TMPDIR is found in the environment, reset it to the value defined in the
3891 TMPDIR macro, if this macro is defined. */
3896 for (p = USS environ; *p != NULL; p++)
3898 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3899 Ustrcmp(*p+7, TMPDIR) != 0)
3901 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3902 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3904 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3910 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3911 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3912 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3913 called by a user who has set the TZ variable. This then affects the timestamps
3914 in log files and in Received: headers, and any created Date: header lines. The
3915 required timezone is settable in the configuration file, so nothing can be done
3916 about this earlier - but hopefully nothing will normally be logged earlier than
3917 this. We have to make a new environment if TZ is wrong, but don't bother if
3918 timestamps_utc is set, because then all times are in UTC anyway. */
3920 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3922 timestamps_utc = TRUE;
3926 uschar *envtz = US getenv("TZ");
3927 if ((envtz == NULL && timezone_string != NULL) ||
3929 (timezone_string == NULL ||
3930 Ustrcmp(timezone_string, envtz) != 0)))
3932 uschar **p = USS environ;
3936 while (*p++ != NULL) count++;
3937 if (envtz == NULL) count++;
3938 newp = new = malloc(sizeof(uschar *) * (count + 1));
3939 for (p = USS environ; *p != NULL; p++)
3941 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3944 if (timezone_string != NULL)
3946 *newp = malloc(Ustrlen(timezone_string) + 4);
3947 sprintf(CS *newp++, "TZ=%s", timezone_string);
3952 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3953 tod_stamp(tod_log));
3957 /* Handle the case when we have removed the setuid privilege because of -C or
3958 -D. This means that the caller of Exim was not root.
3960 There is a problem if we were running as the Exim user. The sysadmin may
3961 expect this case to retain privilege because "the binary was called by the
3962 Exim user", but it hasn't, because either the -D option set macros, or the
3963 -C option set a non-trusted configuration file. There are two possibilities:
3965 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3966 to do message deliveries. Thus, the fact that it is running as a
3967 non-privileged user is plausible, and might be wanted in some special
3968 configurations. However, really_exim will have been set false when
3969 privilege was dropped, to stop Exim trying to write to its normal log
3970 files. Therefore, re-enable normal log processing, assuming the sysadmin
3971 has set up the log directory correctly.
3973 (2) If deliver_drop_privilege is not set, the configuration won't work as
3974 apparently intended, and so we log a panic message. In order to retain
3975 root for -C or -D, the caller must either be root or be invoking a
3976 trusted configuration file (when deliver_drop_privilege is false). */
3978 if (removed_privilege && (!trusted_config || macros != NULL) &&
3979 real_uid == exim_uid)
3981 if (deliver_drop_privilege)
3982 really_exim = TRUE; /* let logging work normally */
3984 log_write(0, LOG_MAIN|LOG_PANIC,
3985 "exim user lost privilege for using %s option",
3986 trusted_config? "-D" : "-C");
3989 /* Start up Perl interpreter if Perl support is configured and there is a
3990 perl_startup option, and the configuration or the command line specifies
3991 initializing starting. Note that the global variables are actually called
3992 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3995 if (perl_start_option != 0)
3996 opt_perl_at_start = (perl_start_option > 0);
3997 if (opt_perl_at_start && opt_perl_startup != NULL)
4000 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4001 errstr = init_perl(opt_perl_startup);
4004 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4005 return EXIT_FAILURE;
4007 opt_perl_started = TRUE;
4009 #endif /* EXIM_PERL */
4011 /* Log the arguments of the call if the configuration file said so. This is
4012 a debugging feature for finding out what arguments certain MUAs actually use.
4013 Don't attempt it if logging is disabled, or if listing variables or if
4014 verifying/testing addresses or expansions. */
4016 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4017 && really_exim && !list_options && !checking)
4020 uschar *p = big_buffer;
4022 Ustrcpy(p, "cwd= (failed)");
4023 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4025 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4027 for (i = 0; i < argc; i++)
4029 int len = Ustrlen(argv[i]);
4030 const uschar *printing;
4032 if (p + len + 8 >= big_buffer + big_buffer_size)
4035 log_write(0, LOG_MAIN, "%s", big_buffer);
4036 Ustrcpy(big_buffer, "...");
4039 printing = string_printing(argv[i]);
4040 if (printing[0] == 0) quote = US"\""; else
4042 const uschar *pp = printing;
4044 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4046 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4047 (p - big_buffer) - 4), printing, quote);
4051 if (LOGGING(arguments))
4052 log_write(0, LOG_MAIN, "%s", big_buffer);
4054 debug_printf("%s\n", big_buffer);
4057 /* Set the working directory to be the top-level spool directory. We don't rely
4058 on this in the code, which always uses fully qualified names, but it's useful
4059 for core dumps etc. Don't complain if it fails - the spool directory might not
4060 be generally accessible and calls with the -C option (and others) have lost
4061 privilege by now. Before the chdir, we try to ensure that the directory exists.
4064 if (Uchdir(spool_directory) != 0)
4067 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4068 dummy = /* quieten compiler */ Uchdir(spool_directory);
4071 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4072 alias file. Exim doesn't have such a concept, but this call is screwed into
4073 Sun's YP makefiles. Handle this by calling a configured script, as the real
4074 user who called Exim. The -oA option can be used to pass an argument to the
4079 (void)fclose(config_file);
4080 if (bi_command != NULL)
4084 argv[i++] = bi_command;
4085 if (alias_arg != NULL) argv[i++] = alias_arg;
4088 setgroups(group_count, group_list);
4089 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4091 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4092 (argv[1] == NULL)? US"" : argv[1]);
4094 execv(CS argv[0], (char *const *)argv);
4095 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4100 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4105 /* We moved the admin/trusted check to be immediately after reading the
4106 configuration file. We leave these prints here to ensure that syslog setup,
4107 logfile setup, and so on has already happened. */
4109 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4110 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4112 /* Only an admin user may start the daemon or force a queue run in the default
4113 configuration, but the queue run restriction can be relaxed. Only an admin
4114 user may request that a message be returned to its sender forthwith. Only an
4115 admin user may specify a debug level greater than D_v (because it might show
4116 passwords, etc. in lookup queries). Only an admin user may request a queue
4117 count. Only an admin user can use the test interface to scan for email
4118 (because Exim will be in the spool dir and able to look at mails). */
4122 BOOL debugset = (debug_selector & ~D_v) != 0;
4123 if (deliver_give_up || daemon_listen || malware_test_file ||
4124 (count_queue && queue_list_requires_admin) ||
4125 (list_queue && queue_list_requires_admin) ||
4126 (queue_interval >= 0 && prod_requires_admin) ||
4127 (debugset && !running_in_test_harness))
4129 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4134 /* If the real user is not root or the exim uid, the argument for passing
4135 in an open TCP/IP connection for another message is not permitted, nor is
4136 running with the -N option for any delivery action, unless this call to exim is
4137 one that supplied an input message, or we are using a patched exim for
4138 regression testing. */
4140 if (real_uid != root_uid && real_uid != exim_uid &&
4141 (continue_hostname != NULL ||
4143 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4144 )) && !running_in_test_harness)
4146 fprintf(stderr, "exim: Permission denied\n");
4147 return EXIT_FAILURE;
4150 /* If the caller is not trusted, certain arguments are ignored when running for
4151 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4152 Note that authority for performing certain actions on messages is tested in the
4153 queue_action() function. */
4155 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4157 sender_host_name = sender_host_address = interface_address =
4158 sender_ident = received_protocol = NULL;
4159 sender_host_port = interface_port = 0;
4160 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4163 /* If a sender host address is set, extract the optional port number off the
4164 end of it and check its syntax. Do the same thing for the interface address.
4165 Exim exits if the syntax is bad. */
4169 if (sender_host_address != NULL)
4170 sender_host_port = check_port(sender_host_address);
4171 if (interface_address != NULL)
4172 interface_port = check_port(interface_address);
4175 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4180 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4181 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4185 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4186 return EXIT_FAILURE;
4190 /* If an SMTP message is being received check to see if the standard input is a
4191 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4192 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4197 union sockaddr_46 inetd_sock;
4198 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4199 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4201 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4202 if (family == AF_INET || family == AF_INET6)
4204 union sockaddr_46 interface_sock;
4205 size = sizeof(interface_sock);
4207 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4208 interface_address = host_ntoa(-1, &interface_sock, NULL,
4211 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4213 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4216 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4217 NULL, &sender_host_port);
4218 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4219 "inetd is not supported when mua_wrapper is set");
4224 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4225 return EXIT_FAILURE;
4231 /* If the load average is going to be needed while receiving a message, get it
4232 now for those OS that require the first call to os_getloadavg() to be done as
4233 root. There will be further calls later for each message received. */
4235 #ifdef LOAD_AVG_NEEDS_ROOT
4236 if (receiving_message &&
4237 (queue_only_load >= 0 ||
4238 (is_inetd && smtp_load_reserve >= 0)
4241 load_average = OS_GETLOADAVG();
4245 /* The queue_only configuration option can be overridden by -odx on the command
4246 line, except that if queue_only_override is false, queue_only cannot be unset
4247 from the command line. */
4249 if (queue_only_set && (queue_only_override || arg_queue_only))
4250 queue_only = arg_queue_only;
4252 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4255 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4256 if (arg_smtp_receive_timeout >= 0)
4257 smtp_receive_timeout = arg_smtp_receive_timeout;
4259 /* If Exim was started with root privilege, unless we have already removed the
4260 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4261 except when starting the daemon or doing some kind of delivery or address
4262 testing (-bt). These are the only cases when root need to be retained. We run
4263 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4264 retained only for starting the daemon. We always do the initgroups() in this
4265 situation (controlled by the TRUE below), in order to be as close as possible
4266 to the state Exim usually runs in. */
4268 if (!unprivileged && /* originally had root AND */
4269 !removed_privilege && /* still got root AND */
4270 !daemon_listen && /* not starting the daemon */
4271 queue_interval <= 0 && /* (either kind of daemon) */
4273 deliver_drop_privilege || /* requested unprivileged */
4275 queue_interval < 0 && /* not running the queue */
4276 (msg_action_arg < 0 || /* and */
4277 msg_action != MSG_DELIVER) && /* not delivering and */
4278 (!checking || !address_test_mode) /* not address checking */
4282 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4285 /* When we are retaining a privileged uid, we still change to the exim gid. */
4290 rv = setgid(exim_gid);
4291 /* Impact of failure is that some stuff might end up with an incorrect group.
4292 We track this for failures from root, since any attempt to change privilege
4293 by root should succeed and failures should be examined. For non-root,
4294 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4295 no need to complain then. */
4298 if (!(unprivileged || removed_privilege))
4301 "exim: changing group failed: %s\n", strerror(errno));
4305 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4306 (long int)exim_gid, strerror(errno));
4310 /* Handle a request to scan a file for malware */
4311 if (malware_test_file)
4313 #ifdef WITH_CONTENT_SCAN
4315 set_process_info("scanning file for malware");
4316 result = malware_in_file(malware_test_file);
4319 printf("No malware found.\n");
4324 printf("Malware lookup returned non-okay/fail: %d\n", result);
4328 printf("Malware found: %s\n", malware_name);
4330 printf("Malware scan detected malware of unknown name.\n");
4332 printf("Malware scanning not enabled at compile time.\n");
4337 /* Handle a request to list the delivery queue */
4341 set_process_info("listing the queue");
4342 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4346 /* Handle a request to count the delivery queue */
4350 set_process_info("counting the queue");
4355 /* Handle actions on specific messages, except for the force delivery and
4356 message load actions, which are done below. Some actions take a whole list of
4357 message ids, which are known to continue up to the end of the arguments. Others
4358 take a single message id and then operate on the recipients list. */
4360 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4362 int yield = EXIT_SUCCESS;
4363 set_process_info("acting on specified messages");
4365 if (!one_msg_action)
4367 for (i = msg_action_arg; i < argc; i++)
4368 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4369 yield = EXIT_FAILURE;
4372 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4373 recipients_arg)) yield = EXIT_FAILURE;
4377 /* We used to set up here to skip reading the ACL section, on
4378 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4379 Now, since the intro of the ${acl } expansion, ACL definitions may be
4380 needed in transports so we lost the optimisation. */
4384 /* The configuration data will have been read into POOL_PERM because we won't
4385 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4386 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4387 configuration were read into POOL_MAIN, because we don't do any resets till
4388 later on. However, it seems right, and it does ensure that both pools get used.
4391 store_pool = POOL_MAIN;
4393 /* Handle the -brt option. This is for checking out retry configurations.
4394 The next three arguments are a domain name or a complete address, and
4395 optionally two error numbers. All it does is to call the function that
4396 scans the retry configuration data. */
4398 if (test_retry_arg >= 0)
4400 retry_config *yield;
4401 int basic_errno = 0;
4405 if (test_retry_arg >= argc)
4407 printf("-brt needs a domain or address argument\n");
4408 exim_exit(EXIT_FAILURE);
4410 s1 = argv[test_retry_arg++];
4413 /* If the first argument contains no @ and no . it might be a local user
4414 or it might be a single-component name. Treat as a domain. */
4416 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4418 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4419 "being \ntreated as a one-component domain, not as a local part.\n\n",
4423 /* There may be an optional second domain arg. */
4425 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4426 s2 = argv[test_retry_arg++];
4428 /* The final arg is an error name */
4430 if (test_retry_arg < argc)
4432 uschar *ss = argv[test_retry_arg];
4434 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4437 printf("%s\n", CS error);
4438 return EXIT_FAILURE;
4441 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4442 code > 100 as an error is for matching codes to the decade. Turn them into
4443 a real error code, off the decade. */
4445 if (basic_errno == ERRNO_MAIL4XX ||
4446 basic_errno == ERRNO_RCPT4XX ||
4447 basic_errno == ERRNO_DATA4XX)
4449 int code = (more_errno >> 8) & 255;
4451 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4452 else if (code > 100)
4453 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4457 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4458 if (yield == NULL) printf("No retry information found\n"); else
4461 more_errno = yield->more_errno;
4462 printf("Retry rule: %s ", yield->pattern);
4464 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4466 printf("quota%s%s ",
4467 (more_errno > 0)? "_" : "",
4468 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4470 else if (yield->basic_errno == ECONNREFUSED)
4472 printf("refused%s%s ",
4473 (more_errno > 0)? "_" : "",
4474 (more_errno == 'M')? "MX" :
4475 (more_errno == 'A')? "A" : "");
4477 else if (yield->basic_errno == ETIMEDOUT)
4480 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4482 if (more_errno != 0) printf("_%s",
4483 (more_errno == 'M')? "MX" : "A");
4486 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4487 printf("auth_failed ");
4490 for (r = yield->rules; r != NULL; r = r->next)
4492 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4493 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4499 printf(",%d.", x/1000);
4513 exim_exit(EXIT_SUCCESS);
4516 /* Handle a request to list one or more configuration options */
4517 /* If -n was set, we suppress some information */
4521 set_process_info("listing variables");
4522 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4523 else for (i = recipients_arg; i < argc; i++)
4526 (Ustrcmp(argv[i], "router") == 0 ||
4527 Ustrcmp(argv[i], "transport") == 0 ||
4528 Ustrcmp(argv[i], "authenticator") == 0 ||
4529 Ustrcmp(argv[i], "macro") == 0))
4531 readconf_print(argv[i+1], argv[i], flag_n);
4534 else readconf_print(argv[i], NULL, flag_n);
4536 exim_exit(EXIT_SUCCESS);
4540 /* Handle a request to deliver one or more messages that are already on the
4541 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4542 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4544 Delivery of specific messages is typically used for a small number when
4545 prodding by hand (when the option forced_delivery will be set) or when
4546 re-execing to regain root privilege. Each message delivery must happen in a
4547 separate process, so we fork a process for each one, and run them sequentially
4548 so that debugging output doesn't get intertwined, and to avoid spawning too
4549 many processes if a long list is given. However, don't fork for the last one;
4550 this saves a process in the common case when Exim is called to deliver just one
4553 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4555 if (prod_requires_admin && !admin_user)
4557 fprintf(stderr, "exim: Permission denied\n");
4558 exim_exit(EXIT_FAILURE);
4560 set_process_info("delivering specified messages");
4561 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4562 for (i = msg_action_arg; i < argc; i++)
4567 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4568 else if ((pid = fork()) == 0)
4570 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4571 _exit(EXIT_SUCCESS);
4575 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4577 exim_exit(EXIT_FAILURE);
4581 exim_exit(EXIT_SUCCESS);
4585 /* If only a single queue run is requested, without SMTP listening, we can just
4586 turn into a queue runner, with an optional starting message id. */
4588 if (queue_interval == 0 && !daemon_listen)
4590 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4591 (start_queue_run_id == NULL)? US"" : US" starting at ",
4592 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4593 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4594 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4595 set_process_info("running the queue (single queue run)");
4596 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4597 exim_exit(EXIT_SUCCESS);
4601 /* Find the login name of the real user running this process. This is always
4602 needed when receiving a message, because it is written into the spool file. It
4603 may also be used to construct a from: or a sender: header, and in this case we
4604 need the user's full name as well, so save a copy of it, checked for RFC822
4605 syntax and munged if necessary, if it hasn't previously been set by the -F
4606 argument. We may try to get the passwd entry more than once, in case NIS or
4607 other delays are in evidence. Save the home directory for use in filter testing
4612 if ((pw = getpwuid(real_uid)) != NULL)
4614 originator_login = string_copy(US pw->pw_name);
4615 originator_home = string_copy(US pw->pw_dir);
4617 /* If user name has not been set by -F, set it from the passwd entry
4618 unless -f has been used to set the sender address by a trusted user. */
4620 if (originator_name == NULL)
4622 if (sender_address == NULL ||
4623 (!trusted_caller && filter_test == FTEST_NONE))
4625 uschar *name = US pw->pw_gecos;
4626 uschar *amp = Ustrchr(name, '&');
4629 /* Most Unix specify that a '&' character in the gecos field is
4630 replaced by a copy of the login name, and some even specify that
4631 the first character should be upper cased, so that's what we do. */
4636 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4637 amp - name, name, &loffset, originator_login, amp + 1);
4638 buffer[loffset] = toupper(buffer[loffset]);
4642 /* If a pattern for matching the gecos field was supplied, apply
4643 it and then expand the name string. */
4645 if (gecos_pattern != NULL && gecos_name != NULL)
4648 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4650 if (regex_match_and_setup(re, name, 0, -1))
4652 uschar *new_name = expand_string(gecos_name);
4654 if (new_name != NULL)
4656 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4657 "gecos field \"%s\"\n", new_name, name);
4660 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4661 "\"%s\": %s\n", gecos_name, expand_string_message);
4663 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4664 "gecos field \"%s\"\n", gecos_pattern, name);
4665 store_free((void *)re);
4667 originator_name = string_copy(name);
4670 /* A trusted caller has used -f but not -F */
4672 else originator_name = US"";
4675 /* Break the retry loop */
4680 if (++i > finduser_retries) break;
4684 /* If we cannot get a user login, log the incident and give up, unless the
4685 configuration specifies something to use. When running in the test harness,
4686 any setting of unknown_login overrides the actual name. */
4688 if (originator_login == NULL || running_in_test_harness)
4690 if (unknown_login != NULL)
4692 originator_login = expand_string(unknown_login);
4693 if (originator_name == NULL && unknown_username != NULL)
4694 originator_name = expand_string(unknown_username);
4695 if (originator_name == NULL) originator_name = US"";
4697 if (originator_login == NULL)
4698 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4702 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4705 originator_name = string_copy(parse_fix_phrase(originator_name,
4706 Ustrlen(originator_name), big_buffer, big_buffer_size));
4708 /* If a message is created by this call of Exim, the uid/gid of its originator
4709 are those of the caller. These values are overridden if an existing message is
4710 read in from the spool. */
4712 originator_uid = real_uid;
4713 originator_gid = real_gid;
4715 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4716 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4718 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4719 returns. We leave this till here so that the originator_ fields are available
4720 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4723 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4727 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4728 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4729 "mua_wrapper is set");
4734 /* If the sender ident has not been set (by a trusted caller) set it to
4735 the caller. This will get overwritten below for an inetd call. If a trusted
4736 caller has set it empty, unset it. */
4738 if (sender_ident == NULL) sender_ident = originator_login;
4739 else if (sender_ident[0] == 0) sender_ident = NULL;
4741 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4742 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4743 originator_* variables set. */
4745 if (test_rewrite_arg >= 0)
4747 really_exim = FALSE;
4748 if (test_rewrite_arg >= argc)
4750 printf("-brw needs an address argument\n");
4751 exim_exit(EXIT_FAILURE);
4753 rewrite_test(argv[test_rewrite_arg]);
4754 exim_exit(EXIT_SUCCESS);
4757 /* A locally-supplied message is considered to be coming from a local user
4758 unless a trusted caller supplies a sender address with -f, or is passing in the
4759 message via SMTP (inetd invocation or otherwise). */
4761 if ((sender_address == NULL && !smtp_input) ||
4762 (!trusted_caller && filter_test == FTEST_NONE))
4764 sender_local = TRUE;
4766 /* A trusted caller can supply authenticated_sender and authenticated_id
4767 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4768 defaults except when host checking. */
4770 if (authenticated_sender == NULL && !host_checking)
4771 authenticated_sender = string_sprintf("%s@%s", originator_login,
4772 qualify_domain_sender);
4773 if (authenticated_id == NULL && !host_checking)
4774 authenticated_id = originator_login;
4777 /* Trusted callers are always permitted to specify the sender address.
4778 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4779 is specified is the empty address. However, if a trusted caller does not
4780 specify a sender address for SMTP input, we leave sender_address unset. This
4781 causes the MAIL commands to be honoured. */
4783 if ((!smtp_input && sender_address == NULL) ||
4784 !receive_check_set_sender(sender_address))
4786 /* Either the caller is not permitted to set a general sender, or this is
4787 non-SMTP input and the trusted caller has not set a sender. If there is no
4788 sender, or if a sender other than <> is set, override with the originator's
4789 login (which will get qualified below), except when checking things. */
4791 if (sender_address == NULL /* No sender_address set */
4793 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4794 !checking && /* Not running tests, AND */
4795 filter_test == FTEST_NONE)) /* Not testing a filter */
4797 sender_address = originator_login;
4798 sender_address_forced = FALSE;
4799 sender_address_domain = 0;
4803 /* Remember whether an untrusted caller set the sender address */
4805 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4807 /* Ensure that the sender address is fully qualified unless it is the empty
4808 address, which indicates an error message, or doesn't exist (root caller, smtp
4809 interface, no -f argument). */
4811 if (sender_address != NULL && sender_address[0] != 0 &&
4812 sender_address_domain == 0)
4813 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4814 qualify_domain_sender);
4816 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4818 /* Handle a request to verify a list of addresses, or test them for delivery.
4819 This must follow the setting of the sender address, since routers can be
4820 predicated upon the sender. If no arguments are given, read addresses from
4821 stdin. Set debug_level to at least D_v to get full output for address testing.
4824 if (verify_address_mode || address_test_mode)
4827 int flags = vopt_qualify;
4829 if (verify_address_mode)
4831 if (!verify_as_sender) flags |= vopt_is_recipient;
4832 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4837 flags |= vopt_is_recipient;
4838 debug_selector |= D_v;
4839 debug_file = stderr;
4840 debug_fd = fileno(debug_file);
4841 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4844 if (recipients_arg < argc)
4846 while (recipients_arg < argc)
4848 uschar *s = argv[recipients_arg++];
4851 BOOL finished = FALSE;
4852 uschar *ss = parse_find_address_end(s, FALSE);
4853 if (*ss == ',') *ss = 0; else finished = TRUE;
4854 test_address(s, flags, &exit_value);
4857 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4864 uschar *s = get_stdinput(NULL, NULL);
4865 if (s == NULL) break;
4866 test_address(s, flags, &exit_value);
4870 exim_exit(exit_value);
4873 /* Handle expansion checking. Either expand items on the command line, or read
4874 from stdin if there aren't any. If -Mset was specified, load the message so
4875 that its variables can be used, but restrict this facility to admin users.
4876 Otherwise, if -bem was used, read a message from stdin. */
4880 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4882 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4885 fprintf(stderr, "exim: permission denied\n");
4888 message_id = argv[msg_action_arg];
4889 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4890 if (!spool_open_datafile(message_id))
4891 printf ("Failed to load message datafile %s\n", message_id);
4892 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4893 printf ("Failed to load message %s\n", message_id);
4896 /* Read a test message from a file. We fudge it up to be on stdin, saving
4897 stdin itself for later reading of expansion strings. */
4899 else if (expansion_test_message != NULL)
4901 int save_stdin = dup(0);
4902 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4905 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4907 return EXIT_FAILURE;
4910 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4911 message_ended = END_NOTENDED;
4912 read_message_body(receive_msg(extract_recipients));
4913 message_linecount += body_linecount;
4914 (void)dup2(save_stdin, 0);
4915 (void)close(save_stdin);
4916 clearerr(stdin); /* Required by Darwin */
4919 /* Allow $recipients for this testing */
4921 enable_dollar_recipients = TRUE;
4923 /* Expand command line items */
4925 if (recipients_arg < argc)
4927 while (recipients_arg < argc)
4929 uschar *s = argv[recipients_arg++];
4930 uschar *ss = expand_string(s);
4931 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4932 else printf("%s\n", CS ss);
4940 char *(*fn_readline)(const char *) = NULL;
4941 void (*fn_addhist)(const char *) = NULL;
4944 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4950 uschar *source = get_stdinput(fn_readline, fn_addhist);
4951 if (source == NULL) break;
4952 ss = expand_string(source);
4954 printf ("Failed: %s\n", expand_string_message);
4955 else printf("%s\n", CS ss);
4959 if (dlhandle != NULL) dlclose(dlhandle);
4963 /* The data file will be open after -Mset */
4965 if (deliver_datafile >= 0)
4967 (void)close(deliver_datafile);
4968 deliver_datafile = -1;
4971 exim_exit(EXIT_SUCCESS);
4975 /* The active host name is normally the primary host name, but it can be varied
4976 for hosts that want to play several parts at once. We need to ensure that it is
4977 set for host checking, and for receiving messages. */
4979 smtp_active_hostname = primary_hostname;
4980 if (raw_active_hostname != NULL)
4982 uschar *nah = expand_string(raw_active_hostname);
4985 if (!expand_string_forcedfail)
4986 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4987 "(smtp_active_hostname): %s", raw_active_hostname,
4988 expand_string_message);
4990 else if (nah[0] != 0) smtp_active_hostname = nah;
4993 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4994 given IP address so that the blocking and relay configuration can be tested.
4995 Unless a sender_ident was set by -oMt, we discard it (the default is the
4996 caller's login name). An RFC 1413 call is made only if we are running in the
4997 test harness and an incoming interface and both ports are specified, because
4998 there is no TCP/IP call to find the ident for. */
5005 if (!sender_ident_set)
5007 sender_ident = NULL;
5008 if (running_in_test_harness && sender_host_port != 0 &&
5009 interface_address != NULL && interface_port != 0)
5010 verify_get_ident(1413);
5013 /* In case the given address is a non-canonical IPv6 address, canonicize
5014 it. The code works for both IPv4 and IPv6, as it happens. */
5016 size = host_aton(sender_host_address, x);
5017 sender_host_address = store_get(48); /* large enough for full IPv6 */
5018 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5020 /* Now set up for testing */
5022 host_build_sender_fullhost();
5026 sender_local = FALSE;
5027 sender_host_notsocket = TRUE;
5028 debug_file = stderr;
5029 debug_fd = fileno(debug_file);
5030 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5031 "**** but without any ident (RFC 1413) callback.\n"
5032 "**** This is not for real!\n\n",
5033 sender_host_address);
5035 if (verify_check_host(&hosts_connection_nolog) == OK)
5036 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5037 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5039 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5040 because a log line has already been written for all its failure exists
5041 (usually "connection refused: <reason>") and writing another one is
5042 unnecessary clutter. */
5044 if (smtp_start_session())
5046 reset_point = store_get(0);
5049 store_reset(reset_point);
5050 if (smtp_setup_msg() <= 0) break;
5051 if (!receive_msg(FALSE)) break;
5055 exim_exit(EXIT_SUCCESS);
5059 /* Arrange for message reception if recipients or SMTP were specified;
5060 otherwise complain unless a version print (-bV) happened or this is a filter
5061 verification test or info dump.
5062 In the former case, show the configuration file name. */
5064 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5066 if (version_printed)
5068 printf("Configuration file is %s\n", config_main_filename);
5069 return EXIT_SUCCESS;
5072 if (info_flag != CMDINFO_NONE)
5074 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5075 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5078 if (filter_test == FTEST_NONE)
5079 exim_usage(called_as);
5083 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5084 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5085 that we are not called from inetd, because that is rejected above. The
5086 following configuration settings are forced here:
5088 (1) Synchronous delivery (-odi)
5089 (2) Errors to stderr (-oep == -oeq)
5090 (3) No parallel remote delivery
5091 (4) Unprivileged delivery
5093 We don't force overall queueing options because there are several of them;
5094 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5095 to override any SMTP queueing. */
5099 synchronous_delivery = TRUE;
5100 arg_error_handling = ERRORS_STDERR;
5101 remote_max_parallel = 1;
5102 deliver_drop_privilege = TRUE;
5104 queue_smtp_domains = NULL;
5105 #ifdef EXPERIMENTAL_INTERNATIONAL
5106 message_utf8_downconvert = -1; /* convert-if-needed */
5111 /* Prepare to accept one or more new messages on the standard input. When a
5112 message has been read, its id is returned in message_id[]. If doing immediate
5113 delivery, we fork a delivery process for each received message, except for the
5114 last one, where we can save a process switch.
5116 It is only in non-smtp mode that error_handling is allowed to be changed from
5117 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5118 sendmail error modes other than -oem ever actually used? Later: yes.) */
5120 if (!smtp_input) error_handling = arg_error_handling;
5122 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5123 logging being sent down the socket and make an identd call to get the
5128 (void)fclose(stderr);
5129 exim_nullstd(); /* Re-open to /dev/null */
5130 verify_get_ident(IDENT_PORT);
5131 host_build_sender_fullhost();
5132 set_process_info("handling incoming connection from %s via inetd",
5136 /* If the sender host address has been set, build sender_fullhost if it hasn't
5137 already been done (which it will have been for inetd). This caters for the
5138 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5139 so that the test for IP options is skipped for -bs input. */
5141 if (sender_host_address != NULL && sender_fullhost == NULL)
5143 host_build_sender_fullhost();
5144 set_process_info("handling incoming connection from %s via -oMa",
5146 sender_host_notsocket = TRUE;
5149 /* Otherwise, set the sender host as unknown except for inetd calls. This
5150 prevents host checking in the case of -bs not from inetd and also for -bS. */
5152 else if (!is_inetd) sender_host_unknown = TRUE;
5154 /* If stdout does not exist, then dup stdin to stdout. This can happen
5155 if exim is started from inetd. In this case fd 0 will be set to the socket,
5156 but fd 1 will not be set. This also happens for passed SMTP channels. */
5158 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5160 /* Set up the incoming protocol name and the state of the program. Root is
5161 allowed to force received protocol via the -oMr option above. If we have come
5162 via inetd, the process info has already been set up. We don't set
5163 received_protocol here for smtp input, as it varies according to
5164 batch/HELO/EHLO/AUTH/TLS. */
5168 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5169 smtp_batched_input? "batched " : "",
5170 (sender_address!= NULL)? sender_address : originator_login);
5174 if (received_protocol == NULL)
5175 received_protocol = string_sprintf("local%s", called_as);
5176 set_process_info("accepting a local non-SMTP message from <%s>",
5180 /* Initialize the session_local_queue-only flag (this will be ignored if
5181 mua_wrapper is set) */
5184 session_local_queue_only = queue_only;
5186 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5187 the spool if so configured. On failure, we must not attempt to send an error
5188 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5189 error code is given.) */
5191 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5193 fprintf(stderr, "exim: insufficient disk space\n");
5194 return EXIT_FAILURE;
5197 /* If this is smtp input of any kind, real or batched, handle the start of the
5200 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5201 because a log line has already been written for all its failure exists
5202 (usually "connection refused: <reason>") and writing another one is
5203 unnecessary clutter. */
5209 if (verify_check_host(&hosts_connection_nolog) == OK)
5210 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5211 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5212 if (!smtp_start_session())
5215 exim_exit(EXIT_SUCCESS);
5219 /* Otherwise, set up the input size limit here. */
5223 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5224 if (expand_string_message != NULL)
5226 if (thismessage_size_limit == -1)
5227 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5228 "message_size_limit: %s", expand_string_message);
5230 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5231 "message_size_limit: %s", expand_string_message);
5235 /* Loop for several messages when reading SMTP input. If we fork any child
5236 processes, we don't want to wait for them unless synchronous delivery is
5237 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5238 same as SIG_DFL, despite the fact that documentation often lists the default as
5239 "ignore". This is a confusing area. This is what I know:
5241 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5242 processes that complete simply to go away without ever becoming defunct. You
5243 can't then wait for them - but we don't want to wait for them in the
5244 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5245 happen for all OS (e.g. *BSD is different).
5247 But that's not the end of the story. Some (many? all?) systems have the
5248 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5249 has by default, so it seems that the difference is merely one of default
5250 (compare restarting vs non-restarting signals).
5252 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5253 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5254 of the loop below. Paranoia rules.
5256 February 2003: That's *still* not the end of the story. There are now versions
5257 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5258 process then calls waitpid(), a grumble is written to the system log, because
5259 this is logically inconsistent. In other words, it doesn't like the paranoia.
5260 As a consequenc of this, the waitpid() below is now excluded if we are sure
5261 that SIG_IGN works. */
5263 if (!synchronous_delivery)
5266 struct sigaction act;
5267 act.sa_handler = SIG_IGN;
5268 sigemptyset(&(act.sa_mask));
5269 act.sa_flags = SA_NOCLDWAIT;
5270 sigaction(SIGCHLD, &act, NULL);
5272 signal(SIGCHLD, SIG_IGN);
5276 /* Save the current store pool point, for resetting at the start of
5277 each message, and save the real sender address, if any. */
5279 reset_point = store_get(0);
5280 real_sender_address = sender_address;
5282 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5283 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5288 store_reset(reset_point);
5291 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5292 input and build the recipients list, before calling receive_msg() to read the
5293 message proper. Whatever sender address is given in the SMTP transaction is
5294 often ignored for local senders - we use the actual sender, which is normally
5295 either the underlying user running this process or a -f argument provided by
5296 a trusted caller. It is saved in real_sender_address. The test for whether to
5297 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5302 if ((rc = smtp_setup_msg()) > 0)
5304 if (real_sender_address != NULL &&
5305 !receive_check_set_sender(sender_address))
5307 sender_address = raw_sender = real_sender_address;
5308 sender_address_unrewritten = NULL;
5311 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5312 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5313 the very end. The result of the ACL is ignored (as for other non-SMTP
5314 messages). It is run for its potential side effects. */
5316 if (smtp_batched_input && acl_not_smtp_start != NULL)
5318 uschar *user_msg, *log_msg;
5319 enable_dollar_recipients = TRUE;
5320 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5321 &user_msg, &log_msg);
5322 enable_dollar_recipients = FALSE;
5325 /* Now get the data for the message */
5327 more = receive_msg(extract_recipients);
5328 if (message_id[0] == 0)
5331 smtp_log_no_mail(); /* Log no mail if configured */
5332 exim_exit(EXIT_FAILURE);
5337 smtp_log_no_mail(); /* Log no mail if configured */
5338 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5342 /* In the non-SMTP case, we have all the information from the command
5343 line, but must process it in case it is in the more general RFC822
5344 format, and in any case, to detect syntax errors. Also, it appears that
5345 the use of comma-separated lists as single arguments is common, so we
5346 had better support them. */
5352 int count = argc - recipients_arg;
5353 uschar **list = argv + recipients_arg;
5355 /* These options cannot be changed dynamically for non-SMTP messages */
5357 active_local_sender_retain = local_sender_retain;
5358 active_local_from_check = local_from_check;
5360 /* Save before any rewriting */
5362 raw_sender = string_copy(sender_address);
5364 /* Loop for each argument */
5366 for (i = 0; i < count; i++)
5368 int start, end, domain;
5370 uschar *s = list[i];
5372 /* Loop for each comma-separated address */
5376 BOOL finished = FALSE;
5378 uschar *ss = parse_find_address_end(s, FALSE);
5380 if (*ss == ',') *ss = 0; else finished = TRUE;
5382 /* Check max recipients - if -t was used, these aren't recipients */
5384 if (recipients_max > 0 && ++rcount > recipients_max &&
5385 !extract_recipients)
5386 if (error_handling == ERRORS_STDERR)
5388 fprintf(stderr, "exim: too many recipients\n");
5389 exim_exit(EXIT_FAILURE);
5394 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5395 errors_sender_rc : EXIT_FAILURE;
5398 #ifdef EXPERIMENTAL_INTERNATIONAL
5400 BOOL b = allow_utf8_domains;
5401 allow_utf8_domains = TRUE;
5404 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5406 #ifdef EXPERIMENTAL_INTERNATIONAL
5407 if (string_is_utf8(recipient))
5408 message_smtputf8 = TRUE;
5410 allow_utf8_domains = b;
5413 if (domain == 0 && !allow_unqualified_recipient)
5416 errmess = US"unqualified recipient address not allowed";
5419 if (recipient == NULL)
5421 if (error_handling == ERRORS_STDERR)
5423 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5424 string_printing(list[i]), errmess);
5425 exim_exit(EXIT_FAILURE);
5431 eblock.text1 = string_printing(list[i]);
5432 eblock.text2 = errmess;
5434 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5435 errors_sender_rc : EXIT_FAILURE;
5439 receive_add_recipient(recipient, -1);
5442 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5446 /* Show the recipients when debugging */
5451 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5452 if (recipients_list != NULL)
5454 debug_printf("Recipients:\n");
5455 for (i = 0; i < recipients_count; i++)
5456 debug_printf(" %s\n", recipients_list[i].address);
5460 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5461 ignored; rejecting here would just add complication, and it can just as
5462 well be done later. Allow $recipients to be visible in the ACL. */
5464 if (acl_not_smtp_start != NULL)
5466 uschar *user_msg, *log_msg;
5467 enable_dollar_recipients = TRUE;
5468 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5469 &user_msg, &log_msg);
5470 enable_dollar_recipients = FALSE;
5473 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5474 will just read the headers for the message, and not write anything onto the
5477 message_ended = END_NOTENDED;
5478 more = receive_msg(extract_recipients);
5480 /* more is always FALSE here (not SMTP message) when reading a message
5481 for real; when reading the headers of a message for filter testing,
5482 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5484 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5485 } /* Non-SMTP message reception */
5487 /* If this is a filter testing run, there are headers in store, but
5488 no message on the spool. Run the filtering code in testing mode, setting
5489 the domain to the qualify domain and the local part to the current user,
5490 unless they have been set by options. The prefix and suffix are left unset
5491 unless specified. The the return path is set to to the sender unless it has
5492 already been set from a return-path header in the message. */
5494 if (filter_test != FTEST_NONE)
5496 deliver_domain = (ftest_domain != NULL)?
5497 ftest_domain : qualify_domain_recipient;
5498 deliver_domain_orig = deliver_domain;
5499 deliver_localpart = (ftest_localpart != NULL)?
5500 ftest_localpart : originator_login;
5501 deliver_localpart_orig = deliver_localpart;
5502 deliver_localpart_prefix = ftest_prefix;
5503 deliver_localpart_suffix = ftest_suffix;
5504 deliver_home = originator_home;
5506 if (return_path == NULL)
5508 printf("Return-path copied from sender\n");
5509 return_path = string_copy(sender_address);
5512 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5513 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5515 receive_add_recipient(
5516 string_sprintf("%s%s%s@%s",
5517 (ftest_prefix == NULL)? US"" : ftest_prefix,
5519 (ftest_suffix == NULL)? US"" : ftest_suffix,
5520 deliver_domain), -1);
5522 printf("Recipient = %s\n", recipients_list[0].address);
5523 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5524 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5526 if (chdir("/")) /* Get away from wherever the user is running this from */
5528 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5529 exim_exit(EXIT_FAILURE);
5532 /* Now we run either a system filter test, or a user filter test, or both.
5533 In the latter case, headers added by the system filter will persist and be
5534 available to the user filter. We need to copy the filter variables
5537 if ((filter_test & FTEST_SYSTEM) != 0)
5539 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5540 exim_exit(EXIT_FAILURE);
5543 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5545 if ((filter_test & FTEST_USER) != 0)
5547 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5548 exim_exit(EXIT_FAILURE);
5551 exim_exit(EXIT_SUCCESS);
5554 /* Else act on the result of message reception. We should not get here unless
5555 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5556 will be TRUE. If it is not, check on the number of messages received in this
5559 if (!session_local_queue_only &&
5560 smtp_accept_queue_per_connection > 0 &&
5561 receive_messagecount > smtp_accept_queue_per_connection)
5563 session_local_queue_only = TRUE;
5564 queue_only_reason = 2;
5567 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5568 and queue_only_load is set, check that the load average is below it. If it is
5569 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5570 default), we put the whole session into queue_only mode. It then remains this
5571 way for any subsequent messages on the same SMTP connection. This is a
5572 deliberate choice; even though the load average may fall, it doesn't seem
5573 right to deliver later messages on the same call when not delivering earlier
5574 ones. However, there are odd cases where this is not wanted, so this can be
5575 changed by setting queue_only_load_latch false. */
5577 local_queue_only = session_local_queue_only;
5578 if (!local_queue_only && queue_only_load >= 0)
5580 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5581 if (local_queue_only)
5583 queue_only_reason = 3;
5584 if (queue_only_load_latch) session_local_queue_only = TRUE;
5588 /* If running as an MUA wrapper, all queueing options and freezing options
5592 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5594 /* Log the queueing here, when it will get a message id attached, but
5595 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5598 if (local_queue_only) switch(queue_only_reason)
5601 log_write(L_delay_delivery,
5602 LOG_MAIN, "no immediate delivery: more than %d messages "
5603 "received in one connection", smtp_accept_queue_per_connection);
5607 log_write(L_delay_delivery,
5608 LOG_MAIN, "no immediate delivery: load average %.2f",
5609 (double)load_average/1000.0);
5613 /* Else do the delivery unless the ACL or local_scan() called for queue only
5614 or froze the message. Always deliver in a separate process. A fork failure is
5615 not a disaster, as the delivery will eventually happen on a subsequent queue
5616 run. The search cache must be tidied before the fork, as the parent will
5617 do it before exiting. The child will trigger a lookup failure and
5618 thereby defer the delivery if it tries to use (for example) a cached ldap
5619 connection that the parent has called unbind on. */
5621 else if (!queue_only_policy && !deliver_freeze)
5626 if ((pid = fork()) == 0)
5629 close_unwanted(); /* Close unwanted file descriptors and TLS */
5630 exim_nullstd(); /* Ensure std{in,out,err} exist */
5632 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5633 mode, deliver_drop_privilege is forced TRUE). */
5635 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5637 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5639 /* Control does not return here. */
5642 /* No need to re-exec */
5644 rc = deliver_message(message_id, FALSE, FALSE);
5646 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5647 EXIT_SUCCESS : EXIT_FAILURE);
5652 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5653 "process: %s", strerror(errno));
5656 /* In the parent, wait if synchronous delivery is required. This will
5657 always be the case in MUA wrapper mode. */
5659 else if (synchronous_delivery)
5662 while (wait(&status) != pid);
5663 if ((status & 0x00ff) != 0)
5664 log_write(0, LOG_MAIN|LOG_PANIC,
5665 "process %d crashed with signal %d while delivering %s",
5666 (int)pid, status & 0x00ff, message_id);
5667 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5671 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5672 automatically reaps children (see comments above the loop), clear away any
5673 finished subprocesses here, in case there are lots of messages coming in
5674 from the same source. */
5676 #ifndef SIG_IGN_WORKS
5677 while (waitpid(-1, NULL, WNOHANG) > 0);
5681 exim_exit(EXIT_SUCCESS); /* Never returns */
5682 return 0; /* To stop compiler warning */