1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(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(CS 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");
829 #ifdef EXPERIMENTAL_SPF
830 fprintf(f, " Experimental_SPF");
832 #ifdef EXPERIMENTAL_SRS
833 fprintf(f, " Experimental_SRS");
835 #ifdef EXPERIMENTAL_BRIGHTMAIL
836 fprintf(f, " Experimental_Brightmail");
838 #ifdef EXPERIMENTAL_DANE
839 fprintf(f, " Experimental_DANE");
841 #ifdef EXPERIMENTAL_DCC
842 fprintf(f, " Experimental_DCC");
844 #ifdef EXPERIMENTAL_DMARC
845 fprintf(f, " Experimental_DMARC");
847 #ifdef EXPERIMENTAL_PROXY
848 fprintf(f, " Experimental_Proxy");
850 #ifdef EXPERIMENTAL_EVENT
851 fprintf(f, " Experimental_Event");
853 #ifdef EXPERIMENTAL_REDIS
854 fprintf(f, " Experimental_Redis");
856 #ifdef EXPERIMENTAL_CERTNAMES
857 fprintf(f, " Experimental_Certnames");
859 #ifdef EXPERIMENTAL_DSN
860 fprintf(f, " Experimental_DSN");
864 fprintf(f, "Lookups (built-in):");
865 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
866 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
868 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
871 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
872 fprintf(f, " dbm dbmjz dbmnz");
874 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
875 fprintf(f, " dnsdb");
877 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
878 fprintf(f, " dsearch");
880 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
881 fprintf(f, " ibase");
883 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
884 fprintf(f, " ldap ldapdn ldapm");
886 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
887 fprintf(f, " mysql");
889 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
890 fprintf(f, " nis nis0");
892 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
893 fprintf(f, " nisplus");
895 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
896 fprintf(f, " oracle");
898 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
899 fprintf(f, " passwd");
901 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
902 fprintf(f, " pgsql");
904 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
905 fprintf(f, " sqlite");
907 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
908 fprintf(f, " testdb");
910 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
911 fprintf(f, " whoson");
915 fprintf(f, "Authenticators:");
917 fprintf(f, " cram_md5");
919 #ifdef AUTH_CYRUS_SASL
920 fprintf(f, " cyrus_sasl");
923 fprintf(f, " dovecot");
926 fprintf(f, " gsasl");
928 #ifdef AUTH_HEIMDAL_GSSAPI
929 fprintf(f, " heimdal_gssapi");
931 #ifdef AUTH_PLAINTEXT
932 fprintf(f, " plaintext");
939 fprintf(f, "Routers:");
941 fprintf(f, " accept");
943 #ifdef ROUTER_DNSLOOKUP
944 fprintf(f, " dnslookup");
946 #ifdef ROUTER_IPLITERAL
947 fprintf(f, " ipliteral");
949 #ifdef ROUTER_IPLOOKUP
950 fprintf(f, " iplookup");
952 #ifdef ROUTER_MANUALROUTE
953 fprintf(f, " manualroute");
955 #ifdef ROUTER_QUERYPROGRAM
956 fprintf(f, " queryprogram");
958 #ifdef ROUTER_REDIRECT
959 fprintf(f, " redirect");
963 fprintf(f, "Transports:");
964 #ifdef TRANSPORT_APPENDFILE
965 fprintf(f, " appendfile");
966 #ifdef SUPPORT_MAILDIR
967 fprintf(f, "/maildir");
969 #ifdef SUPPORT_MAILSTORE
970 fprintf(f, "/mailstore");
976 #ifdef TRANSPORT_AUTOREPLY
977 fprintf(f, " autoreply");
979 #ifdef TRANSPORT_LMTP
982 #ifdef TRANSPORT_PIPE
985 #ifdef TRANSPORT_SMTP
990 if (fixed_never_users[0] > 0)
993 fprintf(f, "Fixed never_users: ");
994 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
995 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
996 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
999 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1001 /* Everything else is details which are only worth reporting when debugging.
1002 Perhaps the tls_version_report should move into this too. */
1007 /* clang defines __GNUC__ (at least, for me) so test for it first */
1008 #if defined(__clang__)
1009 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1010 #elif defined(__GNUC__)
1011 fprintf(f, "Compiler: GCC [%s]\n",
1015 "? unknown version ?"
1019 fprintf(f, "Compiler: <unknown>\n");
1023 tls_version_report(f);
1026 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1027 if (authi->version_report) {
1028 (*authi->version_report)(f);
1032 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1033 characters; unless it's an ancient version of PCRE in which case it
1035 #ifndef PCRE_PRERELEASE
1036 #define PCRE_PRERELEASE
1039 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1040 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1042 PCRE_MAJOR, PCRE_MINOR,
1043 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1046 #undef EXPAND_AND_QUOTE
1049 for (i = 0; i < lookup_list_count; i++)
1051 if (lookup_list[i]->version_report)
1052 lookup_list[i]->version_report(f);
1055 #ifdef WHITELIST_D_MACROS
1056 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1058 fprintf(f, "WHITELIST_D_MACROS unset\n");
1060 #ifdef TRUSTED_CONFIG_LIST
1061 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1063 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1070 /*************************************************
1071 * Show auxiliary information about Exim *
1072 *************************************************/
1075 show_exim_information(enum commandline_info request, FILE *stream)
1082 fprintf(stream, "Oops, something went wrong.\n");
1086 "The -bI: flag takes a string indicating which information to provide.\n"
1087 "If the string is not recognised, you'll get this help (on stderr).\n"
1089 " exim -bI:help this information\n"
1090 " exim -bI:dscp dscp value keywords known\n"
1091 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1095 for (pp = exim_sieve_extension_list; *pp; ++pp)
1096 fprintf(stream, "%s\n", *pp);
1099 dscp_list_to_stream(stream);
1105 /*************************************************
1106 * Quote a local part *
1107 *************************************************/
1109 /* This function is used when a sender address or a From: or Sender: header
1110 line is being created from the caller's login, or from an authenticated_id. It
1111 applies appropriate quoting rules for a local part.
1113 Argument: the local part
1114 Returns: the local part, quoted if necessary
1118 local_part_quote(uschar *lpart)
1120 BOOL needs_quote = FALSE;
1125 for (t = lpart; !needs_quote && *t != 0; t++)
1127 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1128 (*t != '.' || t == lpart || t[1] == 0);
1131 if (!needs_quote) return lpart;
1134 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1138 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1141 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1144 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1145 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1146 yield = string_cat(yield, &size, &ptr, nq, 1);
1150 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1158 /*************************************************
1159 * Load readline() functions *
1160 *************************************************/
1162 /* This function is called from testing executions that read data from stdin,
1163 but only when running as the calling user. Currently, only -be does this. The
1164 function loads the readline() function library and passes back the functions.
1165 On some systems, it needs the curses library, so load that too, but try without
1166 it if loading fails. All this functionality has to be requested at build time.
1169 fn_readline_ptr pointer to where to put the readline pointer
1170 fn_addhist_ptr pointer to where to put the addhistory function
1172 Returns: the dlopen handle or NULL on failure
1176 set_readline(char * (**fn_readline_ptr)(const char *),
1177 void (**fn_addhist_ptr)(const char *))
1180 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1182 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1183 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1185 if (dlhandle != NULL)
1187 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1188 * char * readline (const char *prompt);
1189 * void add_history (const char *string);
1191 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1192 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1196 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1205 /*************************************************
1206 * Get a line from stdin for testing things *
1207 *************************************************/
1209 /* This function is called when running tests that can take a number of lines
1210 of input (for example, -be and -bt). It handles continuations and trailing
1211 spaces. And prompting and a blank line output on eof. If readline() is in use,
1212 the arguments are non-NULL and provide the relevant functions.
1215 fn_readline readline function or NULL
1216 fn_addhist addhist function or NULL
1218 Returns: pointer to dynamic memory, or NULL at end of file
1222 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1227 uschar *yield = NULL;
1229 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1233 uschar buffer[1024];
1237 char *readline_line = NULL;
1238 if (fn_readline != NULL)
1240 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1241 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1242 p = US readline_line;
1247 /* readline() not in use */
1250 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1254 /* Handle the line */
1256 ss = p + (int)Ustrlen(p);
1257 while (ss > p && isspace(ss[-1])) ss--;
1261 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1264 yield = string_cat(yield, &size, &ptr, p, ss - p);
1267 if (fn_readline != NULL) free(readline_line);
1270 if (ss == p || yield[ptr-1] != '\\')
1278 if (yield == NULL) printf("\n");
1284 /*************************************************
1285 * Output usage information for the program *
1286 *************************************************/
1288 /* This function is called when there are no recipients
1289 or a specific --help argument was added.
1292 progname information on what name we were called by
1294 Returns: DOES NOT RETURN
1298 exim_usage(uschar *progname)
1301 /* Handle specific program invocation varients */
1302 if (Ustrcmp(progname, US"-mailq") == 0)
1305 "mailq - list the contents of the mail queue\n\n"
1306 "For a list of options, see the Exim documentation.\n");
1310 /* Generic usage - we output this whatever happens */
1312 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1313 "not directly from a shell command line. Options and/or arguments control\n"
1314 "what it does when called. For a list of options, see the Exim documentation.\n");
1321 /*************************************************
1322 * Validate that the macros given are okay *
1323 *************************************************/
1325 /* Typically, Exim will drop privileges if macros are supplied. In some
1326 cases, we want to not do so.
1328 Arguments: none (macros is a global)
1329 Returns: true if trusted, false otherwise
1333 macros_trusted(void)
1335 #ifdef WHITELIST_D_MACROS
1337 uschar *whitelisted, *end, *p, **whites, **w;
1338 int white_count, i, n;
1340 BOOL prev_char_item, found;
1345 #ifndef WHITELIST_D_MACROS
1349 /* We only trust -D overrides for some invoking users:
1350 root, the exim run-time user, the optional config owner user.
1351 I don't know why config-owner would be needed, but since they can own the
1352 config files anyway, there's no security risk to letting them override -D. */
1353 if ( ! ((real_uid == root_uid)
1354 || (real_uid == exim_uid)
1355 #ifdef CONFIGURE_OWNER
1356 || (real_uid == config_uid)
1360 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1364 /* Get a list of macros which are whitelisted */
1365 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1366 prev_char_item = FALSE;
1368 for (p = whitelisted; *p != '\0'; ++p)
1370 if (*p == ':' || isspace(*p))
1375 prev_char_item = FALSE;
1378 if (!prev_char_item)
1379 prev_char_item = TRUE;
1386 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1387 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1392 if (i == white_count)
1394 while (*p != '\0' && p < end)
1400 /* The list of macros should be very short. Accept the N*M complexity. */
1401 for (m = macros; m != NULL; m = m->next)
1404 for (w = whites; *w; ++w)
1405 if (Ustrcmp(*w, m->name) == 0)
1412 if (m->replacement == NULL)
1414 len = Ustrlen(m->replacement);
1417 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1418 0, PCRE_EOPT, NULL, 0);
1421 if (n != PCRE_ERROR_NOMATCH)
1422 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1426 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1432 /*************************************************
1433 * Entry point and high-level code *
1434 *************************************************/
1436 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1437 the appropriate action. All the necessary functions are present in the one
1438 binary. I originally thought one should split it up, but it turns out that so
1439 much of the apparatus is needed in each chunk that one might as well just have
1440 it all available all the time, which then makes the coding easier as well.
1443 argc count of entries in argv
1444 argv argument strings, with argv[0] being the program name
1446 Returns: EXIT_SUCCESS if terminated successfully
1447 EXIT_FAILURE otherwise, except when a message has been sent
1448 to the sender, and -oee was given
1452 main(int argc, char **cargv)
1454 uschar **argv = USS cargv;
1455 int arg_receive_timeout = -1;
1456 int arg_smtp_receive_timeout = -1;
1457 int arg_error_handling = error_handling;
1458 int filter_sfd = -1;
1459 int filter_ufd = -1;
1462 int list_queue_option = 0;
1464 int msg_action_arg = -1;
1465 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1466 int queue_only_reason = 0;
1468 int perl_start_option = 0;
1470 int recipients_arg = argc;
1471 int sender_address_domain = 0;
1472 int test_retry_arg = -1;
1473 int test_rewrite_arg = -1;
1474 BOOL arg_queue_only = FALSE;
1475 BOOL bi_option = FALSE;
1476 BOOL checking = FALSE;
1477 BOOL count_queue = FALSE;
1478 BOOL expansion_test = FALSE;
1479 BOOL extract_recipients = FALSE;
1480 BOOL flag_G = FALSE;
1481 BOOL flag_n = FALSE;
1482 BOOL forced_delivery = FALSE;
1483 BOOL f_end_dot = FALSE;
1484 BOOL deliver_give_up = FALSE;
1485 BOOL list_queue = FALSE;
1486 BOOL list_options = FALSE;
1487 BOOL local_queue_only;
1489 BOOL one_msg_action = FALSE;
1490 BOOL queue_only_set = FALSE;
1491 BOOL receiving_message = TRUE;
1492 BOOL sender_ident_set = FALSE;
1493 BOOL session_local_queue_only;
1495 BOOL removed_privilege = FALSE;
1496 BOOL usage_wanted = FALSE;
1497 BOOL verify_address_mode = FALSE;
1498 BOOL verify_as_sender = FALSE;
1499 BOOL version_printed = FALSE;
1500 uschar *alias_arg = NULL;
1501 uschar *called_as = US"";
1502 uschar *cmdline_syslog_name = NULL;
1503 uschar *start_queue_run_id = NULL;
1504 uschar *stop_queue_run_id = NULL;
1505 uschar *expansion_test_message = NULL;
1506 uschar *ftest_domain = NULL;
1507 uschar *ftest_localpart = NULL;
1508 uschar *ftest_prefix = NULL;
1509 uschar *ftest_suffix = NULL;
1510 uschar *malware_test_file = NULL;
1511 uschar *real_sender_address;
1512 uschar *originator_home = US"/";
1517 struct stat statbuf;
1518 pid_t passed_qr_pid = (pid_t)0;
1519 int passed_qr_pipe = -1;
1520 gid_t group_list[NGROUPS_MAX];
1522 /* For the -bI: flag */
1523 enum commandline_info info_flag = CMDINFO_NONE;
1524 BOOL info_stdout = FALSE;
1526 /* Possible options for -R and -S */
1528 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1530 /* Need to define this in case we need to change the environment in order
1531 to get rid of a bogus time zone. We have to make it char rather than uschar
1532 because some OS define it in /usr/include/unistd.h. */
1534 extern char **environ;
1536 /* If the Exim user and/or group and/or the configuration file owner/group were
1537 defined by ref:name at build time, we must now find the actual uid/gid values.
1538 This is a feature to make the lives of binary distributors easier. */
1540 #ifdef EXIM_USERNAME
1541 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1545 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1549 /* If ref:name uses a number as the name, route_finduser() returns
1550 TRUE with exim_uid set and pw coerced to NULL. */
1552 exim_gid = pw->pw_gid;
1553 #ifndef EXIM_GROUPNAME
1557 "exim: ref:name should specify a usercode, not a group.\n"
1558 "exim: can't let you get away with it unless you also specify a group.\n");
1565 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1571 #ifdef EXIM_GROUPNAME
1572 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1574 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1580 #ifdef CONFIGURE_OWNERNAME
1581 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1583 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1584 CONFIGURE_OWNERNAME);
1589 /* We default the system_filter_user to be the Exim run-time user, as a
1590 sane non-root value. */
1591 system_filter_uid = exim_uid;
1593 #ifdef CONFIGURE_GROUPNAME
1594 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1596 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1597 CONFIGURE_GROUPNAME);
1602 /* In the Cygwin environment, some initialization needs doing. It is fudged
1603 in by means of this macro. */
1609 /* Check a field which is patched when we are running Exim within its
1610 testing harness; do a fast initial check, and then the whole thing. */
1612 running_in_test_harness =
1613 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1615 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1616 at the start of a program; however, it seems that some environments do not
1617 follow this. A "strange" locale can affect the formatting of timestamps, so we
1620 setlocale(LC_ALL, "C");
1622 /* Set up the default handler for timing using alarm(). */
1624 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1626 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1627 because store_malloc writes a log entry on failure. */
1629 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1630 if (log_buffer == NULL)
1632 fprintf(stderr, "exim: failed to get store for log buffer\n");
1636 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1637 NULL when the daemon is run and the file is closed. We have to use this
1638 indirection, because some systems don't allow writing to the variable "stderr".
1641 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1643 /* Arrange for the PCRE regex library to use our store functions. Note that
1644 the normal calls are actually macros that add additional arguments for
1645 debugging purposes so we have to assign specially constructed functions here.
1646 The default is to use store in the stacking pool, but this is overridden in the
1647 regex_must_compile() function. */
1649 pcre_malloc = function_store_get;
1650 pcre_free = function_dummy_free;
1652 /* Ensure there is a big buffer for temporary use in several places. It is put
1653 in malloc store so that it can be freed for enlargement if necessary. */
1655 big_buffer = store_malloc(big_buffer_size);
1657 /* Set up the handler for the data request signal, and set the initial
1658 descriptive text. */
1660 set_process_info("initializing");
1661 os_restarting_signal(SIGUSR1, usr1_handler);
1663 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1664 in the daemon code. For the rest of Exim's uses, we ignore it. */
1666 signal(SIGHUP, SIG_IGN);
1668 /* We don't want to die on pipe errors as the code is written to handle
1669 the write error instead. */
1671 signal(SIGPIPE, SIG_IGN);
1673 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1674 set to SIG_IGN. This causes subprocesses that complete before the parent
1675 process waits for them not to hang around, so when Exim calls wait(), nothing
1676 is there. The wait() code has been made robust against this, but let's ensure
1677 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1678 ending status. We use sigaction rather than plain signal() on those OS where
1679 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1680 problem on AIX with this.) */
1684 struct sigaction act;
1685 act.sa_handler = SIG_DFL;
1686 sigemptyset(&(act.sa_mask));
1688 sigaction(SIGCHLD, &act, NULL);
1691 signal(SIGCHLD, SIG_DFL);
1694 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1699 /* Set up the version number. Set up the leading 'E' for the external form of
1700 message ids, set the pointer to the internal form, and initialize it to
1701 indicate no message being processed. */
1704 message_id_option[0] = '-';
1705 message_id_external = message_id_option + 1;
1706 message_id_external[0] = 'E';
1707 message_id = message_id_external + 1;
1710 /* Set the umask to zero so that any files Exim creates using open() are
1711 created with the modes that it specifies. NOTE: Files created with fopen() have
1712 a problem, which was not recognized till rather late (February 2006). With this
1713 umask, such files will be world writeable. (They are all content scanning files
1714 in the spool directory, which isn't world-accessible, so this is not a
1715 disaster, but it's untidy.) I don't want to change this overall setting,
1716 however, because it will interact badly with the open() calls. Instead, there's
1717 now a function called modefopen() that fiddles with the umask while calling
1722 /* Precompile the regular expression for matching a message id. Keep this in
1723 step with the code that generates ids in the accept.c module. We need to do
1724 this here, because the -M options check their arguments for syntactic validity
1725 using mac_ismsgid, which uses this. */
1728 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1730 /* Precompile the regular expression that is used for matching an SMTP error
1731 code, possibly extended, at the start of an error message. Note that the
1732 terminating whitespace character is included. */
1735 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1738 #ifdef WHITELIST_D_MACROS
1739 /* Precompile the regular expression used to filter the content of macros
1740 given to -D for permissibility. */
1742 regex_whitelisted_macro =
1743 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1747 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1748 this seems to be a generally accepted convention, since one finds symbolic
1749 links called "mailq" in standard OS configurations. */
1751 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1752 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1755 receiving_message = FALSE;
1756 called_as = US"-mailq";
1759 /* If the program is called as "rmail" treat it as equivalent to
1760 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1761 i.e. preventing a single dot on a line from terminating the message, and
1762 returning with zero return code, even in cases of error (provided an error
1763 message has been sent). */
1765 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1766 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1769 called_as = US"-rmail";
1770 errors_sender_rc = EXIT_SUCCESS;
1773 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1774 this is a smail convention. */
1776 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1777 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1779 smtp_input = smtp_batched_input = TRUE;
1780 called_as = US"-rsmtp";
1783 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1784 this is a smail convention. */
1786 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1787 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1790 receiving_message = FALSE;
1791 called_as = US"-runq";
1794 /* If the program is called as "newaliases" treat it as equivalent to
1795 "exim -bi"; this is a sendmail convention. */
1797 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1798 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1801 receiving_message = FALSE;
1802 called_as = US"-newaliases";
1805 /* Save the original effective uid for a couple of uses later. It should
1806 normally be root, but in some esoteric environments it may not be. */
1808 original_euid = geteuid();
1810 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1811 to be the same as the real ones. This makes a difference only if Exim is setuid
1812 (or setgid) to something other than root, which could be the case in some
1813 special configurations. */
1815 real_uid = getuid();
1816 real_gid = getgid();
1818 if (real_uid == root_uid)
1820 rv = setgid(real_gid);
1823 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1824 (long int)real_gid, strerror(errno));
1827 rv = setuid(real_uid);
1830 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1831 (long int)real_uid, strerror(errno));
1836 /* If neither the original real uid nor the original euid was root, Exim is
1837 running in an unprivileged state. */
1839 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1841 /* Scan the program's arguments. Some can be dealt with right away; others are
1842 simply recorded for checking and handling afterwards. Do a high-level switch
1843 on the second character (the one after '-'), to save some effort. */
1845 for (i = 1; i < argc; i++)
1847 BOOL badarg = FALSE;
1848 uschar *arg = argv[i];
1852 /* An argument not starting with '-' is the start of a recipients list;
1853 break out of the options-scanning loop. */
1861 /* An option consistion of -- terminates the options */
1863 if (Ustrcmp(arg, "--") == 0)
1865 recipients_arg = i + 1;
1869 /* Handle flagged options */
1871 switchchar = arg[1];
1874 /* Make all -ex options synonymous with -oex arguments, since that
1875 is assumed by various callers. Also make -qR options synonymous with -R
1876 options, as that seems to be required as well. Allow for -qqR too, and
1877 the same for -S options. */
1879 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1880 Ustrncmp(arg+1, "qR", 2) == 0 ||
1881 Ustrncmp(arg+1, "qS", 2) == 0)
1883 switchchar = arg[2];
1886 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1888 switchchar = arg[3];
1890 queue_2stage = TRUE;
1893 /* Make -r synonymous with -f, since it is a documented alias */
1895 else if (arg[1] == 'r') switchchar = 'f';
1897 /* Make -ov synonymous with -v */
1899 else if (Ustrcmp(arg, "-ov") == 0)
1905 /* deal with --option_aliases */
1906 else if (switchchar == '-')
1908 if (Ustrcmp(argrest, "help") == 0)
1910 usage_wanted = TRUE;
1913 else if (Ustrcmp(argrest, "version") == 0)
1920 /* High-level switch on active initial letter */
1925 /* sendmail uses -Ac and -Am to control which .cf file is used;
1928 if (*argrest == '\0') { badarg = TRUE; break; }
1931 BOOL ignore = FALSE;
1936 if (*(argrest + 1) == '\0')
1940 if (!ignore) { badarg = TRUE; break; }
1944 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1945 so has no need of it. */
1948 if (*argrest == 0) i++; /* Skip over the type */
1953 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1955 /* -bd: Run in daemon mode, awaiting SMTP connections.
1956 -bdf: Ditto, but in the foreground.
1959 if (*argrest == 'd')
1961 daemon_listen = TRUE;
1962 if (*(++argrest) == 'f') background_daemon = FALSE;
1963 else if (*argrest != 0) { badarg = TRUE; break; }
1966 /* -be: Run in expansion test mode
1967 -bem: Ditto, but read a message from a file first
1970 else if (*argrest == 'e')
1972 expansion_test = checking = TRUE;
1973 if (argrest[1] == 'm')
1975 if (++i >= argc) { badarg = TRUE; break; }
1976 expansion_test_message = argv[i];
1979 if (argrest[1] != 0) { badarg = TRUE; break; }
1982 /* -bF: Run system filter test */
1984 else if (*argrest == 'F')
1986 filter_test |= FTEST_SYSTEM;
1987 if (*(++argrest) != 0) { badarg = TRUE; break; }
1988 if (++i < argc) filter_test_sfile = argv[i]; else
1990 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1995 /* -bf: Run user filter test
1996 -bfd: Set domain for filter testing
1997 -bfl: Set local part for filter testing
1998 -bfp: Set prefix for filter testing
1999 -bfs: Set suffix for filter testing
2002 else if (*argrest == 'f')
2004 if (*(++argrest) == 0)
2006 filter_test |= FTEST_USER;
2007 if (++i < argc) filter_test_ufile = argv[i]; else
2009 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2017 fprintf(stderr, "exim: string expected after %s\n", arg);
2020 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2021 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2022 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2023 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2024 else { badarg = TRUE; break; }
2028 /* -bh: Host checking - an IP address must follow. */
2030 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2032 if (++i >= argc) { badarg = TRUE; break; }
2033 sender_host_address = argv[i];
2034 host_checking = checking = log_testing_mode = TRUE;
2035 host_checking_callout = argrest[1] == 'c';
2038 /* -bi: This option is used by sendmail to initialize *the* alias file,
2039 though it has the -oA option to specify a different file. Exim has no
2040 concept of *the* alias file, but since Sun's YP make script calls
2041 sendmail this way, some support must be provided. */
2043 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2045 /* -bI: provide information, of the type to follow after a colon.
2046 This is an Exim flag. */
2048 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2050 uschar *p = &argrest[2];
2051 info_flag = CMDINFO_HELP;
2054 if (strcmpic(p, CUS"sieve") == 0)
2056 info_flag = CMDINFO_SIEVE;
2059 else if (strcmpic(p, CUS"dscp") == 0)
2061 info_flag = CMDINFO_DSCP;
2064 else if (strcmpic(p, CUS"help") == 0)
2071 /* -bm: Accept and deliver message - the default option. Reinstate
2072 receiving_message, which got turned off for all -b options. */
2074 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2076 /* -bmalware: test the filename given for malware */
2078 else if (Ustrcmp(argrest, "malware") == 0)
2080 if (++i >= argc) { badarg = TRUE; break; }
2081 malware_test_file = argv[i];
2084 /* -bnq: For locally originating messages, do not qualify unqualified
2085 addresses. In the envelope, this causes errors; in header lines they
2088 else if (Ustrcmp(argrest, "nq") == 0)
2090 allow_unqualified_sender = FALSE;
2091 allow_unqualified_recipient = FALSE;
2094 /* -bpxx: List the contents of the mail queue, in various forms. If
2095 the option is -bpc, just a queue count is needed. Otherwise, if the
2096 first letter after p is r, then order is random. */
2098 else if (*argrest == 'p')
2100 if (*(++argrest) == 'c')
2103 if (*(++argrest) != 0) badarg = TRUE;
2107 if (*argrest == 'r')
2109 list_queue_option = 8;
2112 else list_queue_option = 0;
2116 /* -bp: List the contents of the mail queue, top-level only */
2118 if (*argrest == 0) {}
2120 /* -bpu: List the contents of the mail queue, top-level undelivered */
2122 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2124 /* -bpa: List the contents of the mail queue, including all delivered */
2126 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2128 /* Unknown after -bp[r] */
2138 /* -bP: List the configuration variables given as the address list.
2139 Force -v, so configuration errors get displayed. */
2141 else if (Ustrcmp(argrest, "P") == 0)
2143 list_options = TRUE;
2144 debug_selector |= D_v;
2145 debug_file = stderr;
2148 /* -brt: Test retry configuration lookup */
2150 else if (Ustrcmp(argrest, "rt") == 0)
2152 test_retry_arg = i + 1;
2156 /* -brw: Test rewrite configuration */
2158 else if (Ustrcmp(argrest, "rw") == 0)
2160 test_rewrite_arg = i + 1;
2164 /* -bS: Read SMTP commands on standard input, but produce no replies -
2165 all errors are reported by sending messages. */
2167 else if (Ustrcmp(argrest, "S") == 0)
2168 smtp_input = smtp_batched_input = receiving_message = TRUE;
2170 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2171 on standard output. */
2173 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2175 /* -bt: address testing mode */
2177 else if (Ustrcmp(argrest, "t") == 0)
2178 address_test_mode = checking = log_testing_mode = TRUE;
2180 /* -bv: verify addresses */
2182 else if (Ustrcmp(argrest, "v") == 0)
2183 verify_address_mode = checking = log_testing_mode = TRUE;
2185 /* -bvs: verify sender addresses */
2187 else if (Ustrcmp(argrest, "vs") == 0)
2189 verify_address_mode = checking = log_testing_mode = TRUE;
2190 verify_as_sender = TRUE;
2193 /* -bV: Print version string and support details */
2195 else if (Ustrcmp(argrest, "V") == 0)
2197 printf("Exim version %s #%s built %s\n", version_string,
2198 version_cnumber, version_date);
2199 printf("%s\n", CS version_copyright);
2200 version_printed = TRUE;
2201 show_whats_supported(stdout);
2204 /* -bw: inetd wait mode, accept a listening socket as stdin */
2206 else if (*argrest == 'w')
2208 inetd_wait_mode = TRUE;
2209 background_daemon = FALSE;
2210 daemon_listen = TRUE;
2211 if (*(++argrest) != '\0')
2213 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2214 if (inetd_wait_timeout <= 0)
2216 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2226 /* -C: change configuration file list; ignore if it isn't really
2227 a change! Enforce a prefix check if required. */
2232 if(++i < argc) argrest = argv[i]; else
2233 { badarg = TRUE; break; }
2235 if (Ustrcmp(config_main_filelist, argrest) != 0)
2237 #ifdef ALT_CONFIG_PREFIX
2239 int len = Ustrlen(ALT_CONFIG_PREFIX);
2240 uschar *list = argrest;
2242 while((filename = string_nextinlist(&list, &sep, big_buffer,
2243 big_buffer_size)) != NULL)
2245 if ((Ustrlen(filename) < len ||
2246 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2247 Ustrstr(filename, "/../") != NULL) &&
2248 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2250 fprintf(stderr, "-C Permission denied\n");
2255 if (real_uid != root_uid)
2257 #ifdef TRUSTED_CONFIG_LIST
2259 if (real_uid != exim_uid
2260 #ifdef CONFIGURE_OWNER
2261 && real_uid != config_uid
2264 trusted_config = FALSE;
2267 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2270 struct stat statbuf;
2272 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2273 (statbuf.st_uid != root_uid /* owner not root */
2274 #ifdef CONFIGURE_OWNER
2275 && statbuf.st_uid != config_uid /* owner not the special one */
2278 (statbuf.st_gid != root_gid /* group not root */
2279 #ifdef CONFIGURE_GROUP
2280 && statbuf.st_gid != config_gid /* group not the special one */
2282 && (statbuf.st_mode & 020) != 0 /* group writeable */
2284 (statbuf.st_mode & 2) != 0) /* world writeable */
2286 trusted_config = FALSE;
2291 /* Well, the trust list at least is up to scratch... */
2292 void *reset_point = store_get(0);
2293 uschar *trusted_configs[32];
2297 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2299 uschar *start = big_buffer, *nl;
2300 while (*start && isspace(*start))
2304 nl = Ustrchr(start, '\n');
2307 trusted_configs[nr_configs++] = string_copy(start);
2308 if (nr_configs == 32)
2316 uschar *list = argrest;
2318 while (trusted_config && (filename = string_nextinlist(&list,
2319 &sep, big_buffer, big_buffer_size)) != NULL)
2321 for (i=0; i < nr_configs; i++)
2323 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2326 if (i == nr_configs)
2328 trusted_config = FALSE;
2332 store_reset(reset_point);
2336 /* No valid prefixes found in trust_list file. */
2337 trusted_config = FALSE;
2343 /* Could not open trust_list file. */
2344 trusted_config = FALSE;
2348 /* Not root; don't trust config */
2349 trusted_config = FALSE;
2353 config_main_filelist = argrest;
2354 config_changed = TRUE;
2359 /* -D: set up a macro definition */
2362 #ifdef DISABLE_D_OPTION
2363 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2368 macro_item *mlast = NULL;
2371 uschar *s = argrest;
2373 while (isspace(*s)) s++;
2375 if (*s < 'A' || *s > 'Z')
2377 fprintf(stderr, "exim: macro name set by -D must start with "
2378 "an upper case letter\n");
2382 while (isalnum(*s) || *s == '_')
2384 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2388 if (ptr == 0) { badarg = TRUE; break; }
2389 while (isspace(*s)) s++;
2392 if (*s++ != '=') { badarg = TRUE; break; }
2393 while (isspace(*s)) s++;
2396 for (m = macros; m != NULL; m = m->next)
2398 if (Ustrcmp(m->name, name) == 0)
2400 fprintf(stderr, "exim: duplicated -D in command line\n");
2406 m = store_get(sizeof(macro_item) + Ustrlen(name));
2408 m->command_line = TRUE;
2409 if (mlast == NULL) macros = m; else mlast->next = m;
2410 Ustrcpy(m->name, name);
2411 m->replacement = string_copy(s);
2413 if (clmacro_count >= MAX_CLMACROS)
2415 fprintf(stderr, "exim: too many -D options on command line\n");
2418 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2424 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2425 The latter is now a no-op, retained for compatibility only. If -dd is used,
2426 debugging subprocesses of the daemon is disabled. */
2429 if (Ustrcmp(argrest, "ropcr") == 0)
2431 /* drop_cr = TRUE; */
2434 /* Use an intermediate variable so that we don't set debugging while
2435 decoding the debugging bits. */
2439 unsigned int selector = D_default;
2442 if (*argrest == 'd')
2444 debug_daemon = TRUE;
2448 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2449 debug_options_count, US"debug", 0);
2450 debug_selector = selector;
2455 /* -E: This is a local error message. This option is not intended for
2456 external use at all, but is not restricted to trusted callers because it
2457 does no harm (just suppresses certain error messages) and if Exim is run
2458 not setuid root it won't always be trusted when it generates error
2459 messages using this option. If there is a message id following -E, point
2460 message_reference at it, for logging. */
2463 local_error_message = TRUE;
2464 if (mac_ismsgid(argrest)) message_reference = argrest;
2468 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2469 option, so it looks as if historically the -oex options are also callable
2470 without the leading -o. So we have to accept them. Before the switch,
2471 anything starting -oe has been converted to -e. Exim does not support all
2472 of the sendmail error options. */
2475 if (Ustrcmp(argrest, "e") == 0)
2477 arg_error_handling = ERRORS_SENDER;
2478 errors_sender_rc = EXIT_SUCCESS;
2480 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2481 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2482 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2483 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2488 /* -F: Set sender's full name, used instead of the gecos entry from
2489 the password file. Since users can usually alter their gecos entries,
2490 there's no security involved in using this instead. The data can follow
2491 the -F or be in the next argument. */
2496 if(++i < argc) argrest = argv[i]; else
2497 { badarg = TRUE; break; }
2499 originator_name = argrest;
2500 sender_name_forced = TRUE;
2504 /* -f: Set sender's address - this value is only actually used if Exim is
2505 run by a trusted user, or if untrusted_set_sender is set and matches the
2506 address, except that the null address can always be set by any user. The
2507 test for this happens later, when the value given here is ignored when not
2508 permitted. For an untrusted user, the actual sender is still put in Sender:
2509 if it doesn't match the From: header (unless no_local_from_check is set).
2510 The data can follow the -f or be in the next argument. The -r switch is an
2511 obsolete form of -f but since there appear to be programs out there that
2512 use anything that sendmail has ever supported, better accept it - the
2513 synonymizing is done before the switch above.
2515 At this stage, we must allow domain literal addresses, because we don't
2516 know what the setting of allow_domain_literals is yet. Ditto for trailing
2517 dots and strip_trailing_dot. */
2525 if (i+1 < argc) argrest = argv[++i]; else
2526 { badarg = TRUE; break; }
2530 sender_address = string_sprintf(""); /* Ensure writeable memory */
2534 uschar *temp = argrest + Ustrlen(argrest) - 1;
2535 while (temp >= argrest && isspace(*temp)) temp--;
2536 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2537 allow_domain_literals = TRUE;
2538 strip_trailing_dot = TRUE;
2539 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2540 &sender_address_domain, TRUE);
2541 allow_domain_literals = FALSE;
2542 strip_trailing_dot = FALSE;
2543 if (sender_address == NULL)
2545 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2546 return EXIT_FAILURE;
2549 sender_address_forced = TRUE;
2553 /* -G: sendmail invocation to specify that it's a gateway submission and
2554 sendmail may complain about problems instead of fixing them.
2555 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2556 not at this time complain about problems. */
2562 /* -h: Set the hop count for an incoming message. Exim does not currently
2563 support this; it always computes it by counting the Received: headers.
2564 To put it in will require a change to the spool header file format. */
2569 if(++i < argc) argrest = argv[i]; else
2570 { badarg = TRUE; break; }
2572 if (!isdigit(*argrest)) badarg = TRUE;
2576 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2577 not to be documented for sendmail but mailx (at least) uses it) */
2580 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2584 /* -L: set the identifier used for syslog; equivalent to setting
2585 syslog_processname in the config file, but needs to be an admin option. */
2588 if (*argrest == '\0')
2590 if(++i < argc) argrest = argv[i]; else
2591 { badarg = TRUE; break; }
2593 sz = Ustrlen(argrest);
2596 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2597 return EXIT_FAILURE;
2601 fprintf(stderr, "exim: the -L syslog name is too short\n");
2602 return EXIT_FAILURE;
2604 cmdline_syslog_name = argrest;
2608 receiving_message = FALSE;
2610 /* -MC: continue delivery of another message via an existing open
2611 file descriptor. This option is used for an internal call by the
2612 smtp transport when there is a pending message waiting to go to an
2613 address to which it has got a connection. Five subsequent arguments are
2614 required: transport name, host name, IP address, sequence number, and
2615 message_id. Transports may decline to create new processes if the sequence
2616 number gets too big. The channel is stdin. This (-MC) must be the last
2617 argument. There's a subsequent check that the real-uid is privileged.
2619 If we are running in the test harness. delay for a bit, to let the process
2620 that set this one up complete. This makes for repeatability of the logging,
2623 if (Ustrcmp(argrest, "C") == 0)
2625 union sockaddr_46 interface_sock;
2626 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2630 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2631 return EXIT_FAILURE;
2634 if (msg_action_arg >= 0)
2636 fprintf(stderr, "exim: incompatible arguments\n");
2637 return EXIT_FAILURE;
2640 continue_transport = argv[++i];
2641 continue_hostname = argv[++i];
2642 continue_host_address = argv[++i];
2643 continue_sequence = Uatoi(argv[++i]);
2644 msg_action = MSG_DELIVER;
2645 msg_action_arg = ++i;
2646 forced_delivery = TRUE;
2647 queue_run_pid = passed_qr_pid;
2648 queue_run_pipe = passed_qr_pipe;
2650 if (!mac_ismsgid(argv[i]))
2652 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2654 return EXIT_FAILURE;
2657 /* Set up $sending_ip_address and $sending_port */
2659 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2661 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2665 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2667 return EXIT_FAILURE;
2670 if (running_in_test_harness) millisleep(500);
2674 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2675 precedes -MC (see above). The flag indicates that the host to which
2676 Exim is connected has accepted an AUTH sequence. */
2678 else if (Ustrcmp(argrest, "CA") == 0)
2680 smtp_authenticated = TRUE;
2684 #ifdef EXPERIMENTAL_DSN
2685 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2686 that exim is connected to supports the esmtp extension DSN */
2687 else if (Ustrcmp(argrest, "CD") == 0)
2689 smtp_use_dsn = TRUE;
2694 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2695 it preceded -MC (see above) */
2697 else if (Ustrcmp(argrest, "CP") == 0)
2699 smtp_use_pipelining = TRUE;
2703 /* -MCQ: pass on the pid of the queue-running process that started
2704 this chain of deliveries and the fd of its synchronizing pipe; this
2705 is useful only when it precedes -MC (see above) */
2707 else if (Ustrcmp(argrest, "CQ") == 0)
2709 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2711 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2716 /* -MCS: set the smtp_use_size flag; this is useful only when it
2717 precedes -MC (see above) */
2719 else if (Ustrcmp(argrest, "CS") == 0)
2721 smtp_use_size = TRUE;
2725 /* -MCT: set the tls_offered flag; this is useful only when it
2726 precedes -MC (see above). The flag indicates that the host to which
2727 Exim is connected has offered TLS support. */
2730 else if (Ustrcmp(argrest, "CT") == 0)
2737 /* -M[x]: various operations on the following list of message ids:
2738 -M deliver the messages, ignoring next retry times and thawing
2739 -Mc deliver the messages, checking next retry times, no thawing
2740 -Mf freeze the messages
2741 -Mg give up on the messages
2742 -Mt thaw the messages
2743 -Mrm remove the messages
2744 In the above cases, this must be the last option. There are also the
2745 following options which are followed by a single message id, and which
2746 act on that message. Some of them use the "recipient" addresses as well.
2747 -Mar add recipient(s)
2748 -Mmad mark all recipients delivered
2749 -Mmd mark recipients(s) delivered
2751 -Mset load a message for use with -be
2753 -Mvc show copy (of whole message, in RFC 2822 format)
2758 else if (*argrest == 0)
2760 msg_action = MSG_DELIVER;
2761 forced_delivery = deliver_force_thaw = TRUE;
2763 else if (Ustrcmp(argrest, "ar") == 0)
2765 msg_action = MSG_ADD_RECIPIENT;
2766 one_msg_action = TRUE;
2768 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2769 else if (Ustrcmp(argrest, "es") == 0)
2771 msg_action = MSG_EDIT_SENDER;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2775 else if (Ustrcmp(argrest, "g") == 0)
2777 msg_action = MSG_DELIVER;
2778 deliver_give_up = TRUE;
2780 else if (Ustrcmp(argrest, "mad") == 0)
2782 msg_action = MSG_MARK_ALL_DELIVERED;
2784 else if (Ustrcmp(argrest, "md") == 0)
2786 msg_action = MSG_MARK_DELIVERED;
2787 one_msg_action = TRUE;
2789 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2790 else if (Ustrcmp(argrest, "set") == 0)
2792 msg_action = MSG_LOAD;
2793 one_msg_action = TRUE;
2795 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2796 else if (Ustrcmp(argrest, "vb") == 0)
2798 msg_action = MSG_SHOW_BODY;
2799 one_msg_action = TRUE;
2801 else if (Ustrcmp(argrest, "vc") == 0)
2803 msg_action = MSG_SHOW_COPY;
2804 one_msg_action = TRUE;
2806 else if (Ustrcmp(argrest, "vh") == 0)
2808 msg_action = MSG_SHOW_HEADER;
2809 one_msg_action = TRUE;
2811 else if (Ustrcmp(argrest, "vl") == 0)
2813 msg_action = MSG_SHOW_LOG;
2814 one_msg_action = TRUE;
2816 else { badarg = TRUE; break; }
2818 /* All the -Mxx options require at least one message id. */
2820 msg_action_arg = i + 1;
2821 if (msg_action_arg >= argc)
2823 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2824 return EXIT_FAILURE;
2827 /* Some require only message ids to follow */
2829 if (!one_msg_action)
2832 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2834 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2836 return EXIT_FAILURE;
2838 goto END_ARG; /* Remaining args are ids */
2841 /* Others require only one message id, possibly followed by addresses,
2842 which will be handled as normal arguments. */
2846 if (!mac_ismsgid(argv[msg_action_arg]))
2848 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2849 argv[msg_action_arg], arg);
2850 return EXIT_FAILURE;
2857 /* Some programs seem to call the -om option without the leading o;
2858 for sendmail it askes for "me too". Exim always does this. */
2861 if (*argrest != 0) badarg = TRUE;
2865 /* -N: don't do delivery - a debugging option that stops transports doing
2866 their thing. It implies debugging at the D_v level. */
2871 dont_deliver = TRUE;
2872 debug_selector |= D_v;
2873 debug_file = stderr;
2879 /* -n: This means "don't alias" in sendmail, apparently.
2880 For normal invocations, it has no effect.
2881 It may affect some other options. */
2887 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2888 option to the specified value. This form uses long names. We need to handle
2889 -O option=value and -Ooption=value. */
2896 fprintf(stderr, "exim: string expected after -O\n");
2904 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2907 if (*argrest == 'A')
2909 alias_arg = argrest + 1;
2910 if (alias_arg[0] == 0)
2912 if (i+1 < argc) alias_arg = argv[++i]; else
2914 fprintf(stderr, "exim: string expected after -oA\n");
2920 /* -oB: Set a connection message max value for remote deliveries */
2922 else if (*argrest == 'B')
2924 uschar *p = argrest + 1;
2927 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2929 connection_max_messages = 1;
2938 fprintf(stderr, "exim: number expected after -oB\n");
2941 connection_max_messages = Uatoi(p);
2945 /* -odb: background delivery */
2947 else if (Ustrcmp(argrest, "db") == 0)
2949 synchronous_delivery = FALSE;
2950 arg_queue_only = FALSE;
2951 queue_only_set = TRUE;
2954 /* -odf: foreground delivery (smail-compatible option); same effect as
2955 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2958 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2960 synchronous_delivery = TRUE;
2961 arg_queue_only = FALSE;
2962 queue_only_set = TRUE;
2965 /* -odq: queue only */
2967 else if (Ustrcmp(argrest, "dq") == 0)
2969 synchronous_delivery = FALSE;
2970 arg_queue_only = TRUE;
2971 queue_only_set = TRUE;
2974 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2975 but no remote delivery */
2977 else if (Ustrcmp(argrest, "dqs") == 0)
2980 arg_queue_only = FALSE;
2981 queue_only_set = TRUE;
2984 /* -oex: Sendmail error flags. As these are also accepted without the
2985 leading -o prefix, for compatibility with vacation and other callers,
2986 they are handled with -e above. */
2988 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2989 -oitrue: Another sendmail syntax for the same */
2991 else if (Ustrcmp(argrest, "i") == 0 ||
2992 Ustrcmp(argrest, "itrue") == 0)
2995 /* -oM*: Set various characteristics for an incoming message; actually
2996 acted on for trusted callers only. */
2998 else if (*argrest == 'M')
3002 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3006 /* -oMa: Set sender host address */
3008 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3010 /* -oMaa: Set authenticator name */
3012 else if (Ustrcmp(argrest, "Maa") == 0)
3013 sender_host_authenticated = argv[++i];
3015 /* -oMas: setting authenticated sender */
3017 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3019 /* -oMai: setting authenticated id */
3021 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3023 /* -oMi: Set incoming interface address */
3025 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3027 /* -oMm: Message reference */
3029 else if (Ustrcmp(argrest, "Mm") == 0)
3031 if (!mac_ismsgid(argv[i+1]))
3033 fprintf(stderr,"-oMm must be a valid message ID\n");
3036 if (!trusted_config)
3038 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3041 message_reference = argv[++i];
3044 /* -oMr: Received protocol */
3046 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3048 /* -oMs: Set sender host name */
3050 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3052 /* -oMt: Set sender ident */
3054 else if (Ustrcmp(argrest, "Mt") == 0)
3056 sender_ident_set = TRUE;
3057 sender_ident = argv[++i];
3060 /* Else a bad argument */
3069 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3070 seem to call this as -m (undocumented), so that is also accepted (see
3073 else if (Ustrcmp(argrest, "m") == 0) {}
3075 /* -oo: An ancient flag for old-style addresses which still seems to
3076 crop up in some calls (see in SCO). */
3078 else if (Ustrcmp(argrest, "o") == 0) {}
3080 /* -oP <name>: set pid file path for daemon */
3082 else if (Ustrcmp(argrest, "P") == 0)
3083 override_pid_file_path = argv[++i];
3085 /* -or <n>: set timeout for non-SMTP acceptance
3086 -os <n>: set timeout for SMTP acceptance */
3088 else if (*argrest == 'r' || *argrest == 's')
3090 int *tp = (*argrest == 'r')?
3091 &arg_receive_timeout : &arg_smtp_receive_timeout;
3092 if (argrest[1] == 0)
3094 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3096 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3099 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3104 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3106 else if (Ustrcmp(argrest, "X") == 0)
3107 override_local_interfaces = argv[++i];
3109 /* Unknown -o argument */
3115 /* -ps: force Perl startup; -pd force delayed Perl startup */
3119 if (*argrest == 's' && argrest[1] == 0)
3121 perl_start_option = 1;
3124 if (*argrest == 'd' && argrest[1] == 0)
3126 perl_start_option = -1;
3131 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3132 which sets the host protocol and host name */
3136 if (i+1 < argc) argrest = argv[++i]; else
3137 { badarg = TRUE; break; }
3142 uschar *hn = Ustrchr(argrest, ':');
3145 received_protocol = argrest;
3149 received_protocol = string_copyn(argrest, hn - argrest);
3150 sender_host_name = hn + 1;
3157 receiving_message = FALSE;
3158 if (queue_interval >= 0)
3160 fprintf(stderr, "exim: -q specified more than once\n");
3164 /* -qq...: Do queue runs in a 2-stage manner */
3166 if (*argrest == 'q')
3168 queue_2stage = TRUE;
3172 /* -qi...: Do only first (initial) deliveries */
3174 if (*argrest == 'i')
3176 queue_run_first_delivery = TRUE;
3180 /* -qf...: Run the queue, forcing deliveries
3181 -qff..: Ditto, forcing thawing as well */
3183 if (*argrest == 'f')
3185 queue_run_force = TRUE;
3186 if (*(++argrest) == 'f')
3188 deliver_force_thaw = TRUE;
3193 /* -q[f][f]l...: Run the queue only on local deliveries */
3195 if (*argrest == 'l')
3197 queue_run_local = TRUE;
3201 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3202 optionally starting from a given message id. */
3204 if (*argrest == 0 &&
3205 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3208 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3209 start_queue_run_id = argv[++i];
3210 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3211 stop_queue_run_id = argv[++i];
3214 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3215 optionally local only. */
3220 queue_interval = readconf_readtime(argrest, 0, FALSE);
3222 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3223 if (queue_interval <= 0)
3225 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3232 case 'R': /* Synonymous with -qR... */
3233 receiving_message = FALSE;
3235 /* -Rf: As -R (below) but force all deliveries,
3236 -Rff: Ditto, but also thaw all frozen messages,
3237 -Rr: String is regex
3238 -Rrf: Regex and force
3239 -Rrff: Regex and force and thaw
3241 in all cases provided there are no further characters in this
3247 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3249 if (Ustrcmp(argrest, rsopts[i]) == 0)
3251 if (i != 2) queue_run_force = TRUE;
3252 if (i >= 2) deliver_selectstring_regex = TRUE;
3253 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3254 argrest += Ustrlen(rsopts[i]);
3259 /* -R: Set string to match in addresses for forced queue run to
3260 pick out particular messages. */
3264 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3266 fprintf(stderr, "exim: string expected after -R\n");
3270 else deliver_selectstring = argrest;
3274 /* -r: an obsolete synonym for -f (see above) */
3277 /* -S: Like -R but works on sender. */
3279 case 'S': /* Synonymous with -qS... */
3280 receiving_message = FALSE;
3282 /* -Sf: As -S (below) but force all deliveries,
3283 -Sff: Ditto, but also thaw all frozen messages,
3284 -Sr: String is regex
3285 -Srf: Regex and force
3286 -Srff: Regex and force and thaw
3288 in all cases provided there are no further characters in this
3294 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3296 if (Ustrcmp(argrest, rsopts[i]) == 0)
3298 if (i != 2) queue_run_force = TRUE;
3299 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3300 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3301 argrest += Ustrlen(rsopts[i]);
3306 /* -S: Set string to match in addresses for forced queue run to
3307 pick out particular messages. */
3311 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3313 fprintf(stderr, "exim: string expected after -S\n");
3317 else deliver_selectstring_sender = argrest;
3320 /* -Tqt is an option that is exclusively for use by the testing suite.
3321 It is not recognized in other circumstances. It allows for the setting up
3322 of explicit "queue times" so that various warning/retry things can be
3323 tested. Otherwise variability of clock ticks etc. cause problems. */
3326 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3327 fudged_queue_times = argv[++i];
3332 /* -t: Set flag to extract recipients from body of message. */
3335 if (*argrest == 0) extract_recipients = TRUE;
3337 /* -ti: Set flag to extract recipients from body of message, and also
3338 specify that dot does not end the message. */
3340 else if (Ustrcmp(argrest, "i") == 0)
3342 extract_recipients = TRUE;
3346 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3349 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3356 /* -U: This means "initial user submission" in sendmail, apparently. The
3357 doc claims that in future sendmail may refuse syntactically invalid
3358 messages instead of fixing them. For the moment, we just ignore it. */
3364 /* -v: verify things - this is a very low-level debugging */
3369 debug_selector |= D_v;
3370 debug_file = stderr;
3376 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3378 The -x flag tells the sendmail command that mail from a local
3379 mail program has National Language Support (NLS) extended characters
3380 in the body of the mail item. The sendmail command can send mail with
3381 extended NLS characters across networks that normally corrupts these
3384 As Exim is 8-bit clean, it just ignores this flag. */
3387 if (*argrest != 0) badarg = TRUE;
3390 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3391 logs to that file. We swallow the parameter and otherwise ignore it. */
3394 if (*argrest == '\0')
3398 fprintf(stderr, "exim: string expected after -X\n");
3404 /* All other initial characters are errors */
3409 } /* End of high-level switch statement */
3411 /* Failed to recognize the option, or syntax error */
3415 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3416 "option %s\n", arg);
3422 /* If -R or -S have been specified without -q, assume a single queue run. */
3424 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3425 queue_interval < 0) queue_interval = 0;
3429 /* If usage_wanted is set we call the usage function - which never returns */
3430 if (usage_wanted) exim_usage(called_as);
3432 /* Arguments have been processed. Check for incompatibilities. */
3434 (smtp_input || extract_recipients || recipients_arg < argc) &&
3435 (daemon_listen || queue_interval >= 0 || bi_option ||
3436 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3437 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3440 msg_action_arg > 0 &&
3441 (daemon_listen || queue_interval >= 0 || list_options ||
3442 (checking && msg_action != MSG_LOAD) ||
3443 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3446 (daemon_listen || queue_interval >= 0) &&
3447 (sender_address != NULL || list_options || list_queue || checking ||
3451 daemon_listen && queue_interval == 0
3454 inetd_wait_mode && queue_interval >= 0
3458 (checking || smtp_input || extract_recipients ||
3459 filter_test != FTEST_NONE || bi_option)
3462 verify_address_mode &&
3463 (address_test_mode || smtp_input || extract_recipients ||
3464 filter_test != FTEST_NONE || bi_option)
3467 address_test_mode && (smtp_input || extract_recipients ||
3468 filter_test != FTEST_NONE || bi_option)
3471 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3475 deliver_selectstring != NULL && queue_interval < 0
3478 msg_action == MSG_LOAD &&
3479 (!expansion_test || expansion_test_message != NULL)
3483 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3487 /* If debugging is set up, set the file and the file descriptor to pass on to
3488 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3489 to run in the foreground. */
3491 if (debug_selector != 0)
3493 debug_file = stderr;
3494 debug_fd = fileno(debug_file);
3495 background_daemon = FALSE;
3496 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3497 if (debug_selector != D_v) /* -v only doesn't show this */
3499 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3500 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3502 if (!version_printed)
3503 show_whats_supported(stderr);
3507 /* When started with root privilege, ensure that the limits on the number of
3508 open files and the number of processes (where that is accessible) are
3509 sufficiently large, or are unset, in case Exim has been called from an
3510 environment where the limits are screwed down. Not all OS have the ability to
3511 change some of these limits. */
3515 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3521 #ifdef RLIMIT_NOFILE
3522 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3524 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3526 rlp.rlim_cur = rlp.rlim_max = 0;
3529 /* I originally chose 1000 as a nice big number that was unlikely to
3530 be exceeded. It turns out that some older OS have a fixed upper limit of
3533 if (rlp.rlim_cur < 1000)
3535 rlp.rlim_cur = rlp.rlim_max = 1000;
3536 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3538 rlp.rlim_cur = rlp.rlim_max = 256;
3539 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3540 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3547 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3549 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3551 rlp.rlim_cur = rlp.rlim_max = 0;
3554 #ifdef RLIM_INFINITY
3555 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3557 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3559 if (rlp.rlim_cur < 1000)
3561 rlp.rlim_cur = rlp.rlim_max = 1000;
3563 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3564 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3570 /* Exim is normally entered as root (but some special configurations are
3571 possible that don't do this). However, it always spins off sub-processes that
3572 set their uid and gid as required for local delivery. We don't want to pass on
3573 any extra groups that root may belong to, so we want to get rid of them all at
3576 We need to obey setgroups() at this stage, before possibly giving up root
3577 privilege for a changed configuration file, but later on we might need to
3578 check on the additional groups for the admin user privilege - can't do that
3579 till after reading the config, which might specify the exim gid. Therefore,
3580 save the group list here first. */
3582 group_count = getgroups(NGROUPS_MAX, group_list);
3583 if (group_count < 0)
3585 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3589 /* There is a fundamental difference in some BSD systems in the matter of
3590 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3591 known not to be different. On the "different" systems there is a single group
3592 list, and the first entry in it is the current group. On all other versions of
3593 Unix there is a supplementary group list, which is in *addition* to the current
3594 group. Consequently, to get rid of all extraneous groups on a "standard" system
3595 you pass over 0 groups to setgroups(), while on a "different" system you pass
3596 over a single group - the current group, which is always the first group in the
3597 list. Calling setgroups() with zero groups on a "different" system results in
3598 an error return. The following code should cope with both types of system.
3600 However, if this process isn't running as root, setgroups() can't be used
3601 since you have to be root to run it, even if throwing away groups. Not being
3602 root here happens only in some unusual configurations. We just ignore the
3605 if (setgroups(0, NULL) != 0)
3607 if (setgroups(1, group_list) != 0 && !unprivileged)
3609 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3614 /* If the configuration file name has been altered by an argument on the
3615 command line (either a new file name or a macro definition) and the caller is
3616 not root, or if this is a filter testing run, remove any setuid privilege the
3617 program has and run as the underlying user.
3619 The exim user is locked out of this, which severely restricts the use of -C
3622 Otherwise, set the real ids to the effective values (should be root unless run
3623 from inetd, which it can either be root or the exim uid, if one is configured).
3625 There is a private mechanism for bypassing some of this, in order to make it
3626 possible to test lots of configurations automatically, without having either to
3627 recompile each time, or to patch in an actual configuration file name and other
3628 values (such as the path name). If running in the test harness, pretend that
3629 configuration file changes and macro definitions haven't happened. */
3632 (!trusted_config || /* Config changed, or */
3633 !macros_trusted()) && /* impermissible macros and */
3634 real_uid != root_uid && /* Not root, and */
3635 !running_in_test_harness /* Not fudged */
3637 expansion_test /* expansion testing */
3639 filter_test != FTEST_NONE) /* Filter testing */
3641 setgroups(group_count, group_list);
3642 exim_setugid(real_uid, real_gid, FALSE,
3643 US"-C, -D, -be or -bf forces real uid");
3644 removed_privilege = TRUE;
3646 /* In the normal case when Exim is called like this, stderr is available
3647 and should be used for any logging information because attempts to write
3648 to the log will usually fail. To arrange this, we unset really_exim. However,
3649 if no stderr is available there is no point - we might as well have a go
3650 at the log (if it fails, syslog will be written).
3652 Note that if the invoker is Exim, the logs remain available. Messing with
3653 this causes unlogged successful deliveries. */
3655 if ((log_stderr != NULL) && (real_uid != exim_uid))
3656 really_exim = FALSE;
3659 /* Privilege is to be retained for the moment. It may be dropped later,
3660 depending on the job that this Exim process has been asked to do. For now, set
3661 the real uid to the effective so that subsequent re-execs of Exim are done by a
3664 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3666 /* If testing a filter, open the file(s) now, before wasting time doing other
3667 setups and reading the message. */
3669 if ((filter_test & FTEST_SYSTEM) != 0)
3671 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3674 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3676 return EXIT_FAILURE;
3680 if ((filter_test & FTEST_USER) != 0)
3682 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3685 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3687 return EXIT_FAILURE;
3691 /* Initialise lookup_list
3692 If debugging, already called above via version reporting.
3693 In either case, we initialise the list of available lookups while running
3694 as root. All dynamically modules are loaded from a directory which is
3695 hard-coded into the binary and is code which, if not a module, would be
3696 part of Exim already. Ability to modify the content of the directory
3697 is equivalent to the ability to modify a setuid binary!
3699 This needs to happen before we read the main configuration. */
3702 /* Read the main runtime configuration data; this gives up if there
3703 is a failure. It leaves the configuration file open so that the subsequent
3704 configuration data for delivery can be read if needed. */
3706 /* To be safe: change the working directory to /. */
3707 if (Uchdir("/") < 0)
3709 perror("exim: chdir `/': ");
3715 if (cleanup_environment() == FALSE)
3716 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3719 /* If an action on specific messages is requested, or if a daemon or queue
3720 runner is being started, we need to know if Exim was called by an admin user.
3721 This is the case if the real user is root or exim, or if the real group is
3722 exim, or if one of the supplementary groups is exim or a group listed in
3723 admin_groups. We don't fail all message actions immediately if not admin_user,
3724 since some actions can be performed by non-admin users. Instead, set admin_user
3725 for later interrogation. */
3727 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3732 for (i = 0; i < group_count; i++)
3734 if (group_list[i] == exim_gid) admin_user = TRUE;
3735 else if (admin_groups != NULL)
3737 for (j = 1; j <= (int)(admin_groups[0]); j++)
3738 if (admin_groups[j] == group_list[i])
3739 { admin_user = TRUE; break; }
3741 if (admin_user) break;
3745 /* Another group of privileged users are the trusted users. These are root,
3746 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3747 are permitted to specify sender_addresses with -f on the command line, and
3748 other message parameters as well. */
3750 if (real_uid == root_uid || real_uid == exim_uid)
3751 trusted_caller = TRUE;
3756 if (trusted_users != NULL)
3758 for (i = 1; i <= (int)(trusted_users[0]); i++)
3759 if (trusted_users[i] == real_uid)
3760 { trusted_caller = TRUE; break; }
3763 if (!trusted_caller && trusted_groups != NULL)
3765 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3767 if (trusted_groups[i] == real_gid)
3768 trusted_caller = TRUE;
3769 else for (j = 0; j < group_count; j++)
3771 if (trusted_groups[i] == group_list[j])
3772 { trusted_caller = TRUE; break; }
3774 if (trusted_caller) break;
3779 /* Handle the decoding of logging options. */
3781 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3782 log_selector_string, log_options, log_options_count, US"log", 0);
3786 debug_printf("configuration file is %s\n", config_main_filename);
3787 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3788 log_extra_selector);
3791 /* If domain literals are not allowed, check the sender address that was
3792 supplied with -f. Ditto for a stripped trailing dot. */
3794 if (sender_address != NULL)
3796 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3798 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3799 "allowed\n", sender_address);
3800 return EXIT_FAILURE;
3802 if (f_end_dot && !strip_trailing_dot)
3804 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3805 "(trailing dot not allowed)\n", sender_address);
3806 return EXIT_FAILURE;
3810 /* See if an admin user overrode our logging. */
3812 if (cmdline_syslog_name != NULL)
3816 syslog_processname = cmdline_syslog_name;
3817 log_file_path = string_copy(CUS"syslog");
3821 /* not a panic, non-privileged users should not be able to spam paniclog */
3823 "exim: you lack sufficient privilege to specify syslog process name\n");
3824 return EXIT_FAILURE;
3828 /* Paranoia check of maximum lengths of certain strings. There is a check
3829 on the length of the log file path in log.c, which will come into effect
3830 if there are any calls to write the log earlier than this. However, if we
3831 get this far but the string is very long, it is better to stop now than to
3832 carry on and (e.g.) receive a message and then have to collapse. The call to
3833 log_write() from here will cause the ultimate panic collapse if the complete
3834 file name exceeds the buffer length. */
3836 if (Ustrlen(log_file_path) > 200)
3837 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3838 "log_file_path is longer than 200 chars: aborting");
3840 if (Ustrlen(pid_file_path) > 200)
3841 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3842 "pid_file_path is longer than 200 chars: aborting");
3844 if (Ustrlen(spool_directory) > 200)
3845 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3846 "spool_directory is longer than 200 chars: aborting");
3848 /* Length check on the process name given to syslog for its TAG field,
3849 which is only permitted to be 32 characters or less. See RFC 3164. */
3851 if (Ustrlen(syslog_processname) > 32)
3852 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3853 "syslog_processname is longer than 32 chars: aborting");
3855 /* In some operating systems, the environment variable TMPDIR controls where
3856 temporary files are created; Exim doesn't use these (apart from when delivering
3857 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3858 If TMPDIR is found in the environment, reset it to the value defined in the
3859 TMPDIR macro, if this macro is defined. */
3864 if (environ) for (p = USS environ; *p != NULL; p++)
3866 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3867 Ustrcmp(*p+7, TMPDIR) != 0)
3869 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3870 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3872 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3878 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3879 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3880 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3881 called by a user who has set the TZ variable. This then affects the timestamps
3882 in log files and in Received: headers, and any created Date: header lines. The
3883 required timezone is settable in the configuration file, so nothing can be done
3884 about this earlier - but hopefully nothing will normally be logged earlier than
3885 this. We have to make a new environment if TZ is wrong, but don't bother if
3886 timestamps_utc is set, because then all times are in UTC anyway. */
3888 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3890 timestamps_utc = TRUE;
3894 uschar *envtz = US getenv("TZ");
3895 if ((envtz == NULL && timezone_string != NULL) ||
3897 (timezone_string == NULL ||
3898 Ustrcmp(timezone_string, envtz) != 0)))
3900 uschar **p = USS environ;
3904 if (environ) while (*p++ != NULL) count++;
3905 if (envtz == NULL) count++;
3906 newp = new = malloc(sizeof(uschar *) * (count + 1));
3907 if (environ) for (p = USS environ; *p != NULL; p++)
3909 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3912 if (timezone_string != NULL)
3914 *newp = malloc(Ustrlen(timezone_string) + 4);
3915 sprintf(CS *newp++, "TZ=%s", timezone_string);
3920 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3921 tod_stamp(tod_log));
3925 /* Handle the case when we have removed the setuid privilege because of -C or
3926 -D. This means that the caller of Exim was not root.
3928 There is a problem if we were running as the Exim user. The sysadmin may
3929 expect this case to retain privilege because "the binary was called by the
3930 Exim user", but it hasn't, because either the -D option set macros, or the
3931 -C option set a non-trusted configuration file. There are two possibilities:
3933 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3934 to do message deliveries. Thus, the fact that it is running as a
3935 non-privileged user is plausible, and might be wanted in some special
3936 configurations. However, really_exim will have been set false when
3937 privilege was dropped, to stop Exim trying to write to its normal log
3938 files. Therefore, re-enable normal log processing, assuming the sysadmin
3939 has set up the log directory correctly.
3941 (2) If deliver_drop_privilege is not set, the configuration won't work as
3942 apparently intended, and so we log a panic message. In order to retain
3943 root for -C or -D, the caller must either be root or be invoking a
3944 trusted configuration file (when deliver_drop_privilege is false). */
3946 if (removed_privilege && (!trusted_config || macros != NULL) &&
3947 real_uid == exim_uid)
3949 if (deliver_drop_privilege)
3950 really_exim = TRUE; /* let logging work normally */
3952 log_write(0, LOG_MAIN|LOG_PANIC,
3953 "exim user lost privilege for using %s option",
3954 trusted_config? "-D" : "-C");
3957 /* Start up Perl interpreter if Perl support is configured and there is a
3958 perl_startup option, and the configuration or the command line specifies
3959 initializing starting. Note that the global variables are actually called
3960 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3963 if (perl_start_option != 0)
3964 opt_perl_at_start = (perl_start_option > 0);
3965 if (opt_perl_at_start && opt_perl_startup != NULL)
3968 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3969 errstr = init_perl(opt_perl_startup);
3972 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3973 return EXIT_FAILURE;
3975 opt_perl_started = TRUE;
3977 #endif /* EXIM_PERL */
3979 /* Log the arguments of the call if the configuration file said so. This is
3980 a debugging feature for finding out what arguments certain MUAs actually use.
3981 Don't attempt it if logging is disabled, or if listing variables or if
3982 verifying/testing addresses or expansions. */
3984 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3985 && really_exim && !list_options && !checking)
3988 uschar *p = big_buffer;
3990 Ustrcpy(p, "cwd= (failed)");
3991 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3993 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3995 for (i = 0; i < argc; i++)
3997 int len = Ustrlen(argv[i]);
4000 if (p + len + 8 >= big_buffer + big_buffer_size)
4003 log_write(0, LOG_MAIN, "%s", big_buffer);
4004 Ustrcpy(big_buffer, "...");
4007 printing = string_printing(argv[i]);
4008 if (printing[0] == 0) quote = US"\""; else
4010 uschar *pp = printing;
4012 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4014 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4015 (p - big_buffer) - 4), printing, quote);
4019 if ((log_extra_selector & LX_arguments) != 0)
4020 log_write(0, LOG_MAIN, "%s", big_buffer);
4022 debug_printf("%s\n", big_buffer);
4025 /* Set the working directory to be the top-level spool directory. We don't rely
4026 on this in the code, which always uses fully qualified names, but it's useful
4027 for core dumps etc. Don't complain if it fails - the spool directory might not
4028 be generally accessible and calls with the -C option (and others) have lost
4029 privilege by now. Before the chdir, we try to ensure that the directory exists.
4032 if (Uchdir(spool_directory) != 0)
4035 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4036 dummy = /* quieten compiler */ Uchdir(spool_directory);
4039 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4040 alias file. Exim doesn't have such a concept, but this call is screwed into
4041 Sun's YP makefiles. Handle this by calling a configured script, as the real
4042 user who called Exim. The -oA option can be used to pass an argument to the
4047 (void)fclose(config_file);
4048 if (bi_command != NULL)
4052 argv[i++] = bi_command;
4053 if (alias_arg != NULL) argv[i++] = alias_arg;
4056 setgroups(group_count, group_list);
4057 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4059 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4060 (argv[1] == NULL)? US"" : argv[1]);
4062 execv(CS argv[0], (char *const *)argv);
4063 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4068 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4073 /* We moved the admin/trusted check to be immediately after reading the
4074 configuration file. We leave these prints here to ensure that syslog setup,
4075 logfile setup, and so on has already happened. */
4077 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4078 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4080 /* Only an admin user may start the daemon or force a queue run in the default
4081 configuration, but the queue run restriction can be relaxed. Only an admin
4082 user may request that a message be returned to its sender forthwith. Only an
4083 admin user may specify a debug level greater than D_v (because it might show
4084 passwords, etc. in lookup queries). Only an admin user may request a queue
4085 count. Only an admin user can use the test interface to scan for email
4086 (because Exim will be in the spool dir and able to look at mails). */
4090 BOOL debugset = (debug_selector & ~D_v) != 0;
4091 if (deliver_give_up || daemon_listen || malware_test_file ||
4092 (count_queue && queue_list_requires_admin) ||
4093 (list_queue && queue_list_requires_admin) ||
4094 (queue_interval >= 0 && prod_requires_admin) ||
4095 (debugset && !running_in_test_harness))
4097 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4102 /* If the real user is not root or the exim uid, the argument for passing
4103 in an open TCP/IP connection for another message is not permitted, nor is
4104 running with the -N option for any delivery action, unless this call to exim is
4105 one that supplied an input message, or we are using a patched exim for
4106 regression testing. */
4108 if (real_uid != root_uid && real_uid != exim_uid &&
4109 (continue_hostname != NULL ||
4111 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4112 )) && !running_in_test_harness)
4114 fprintf(stderr, "exim: Permission denied\n");
4115 return EXIT_FAILURE;
4118 /* If the caller is not trusted, certain arguments are ignored when running for
4119 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4120 Note that authority for performing certain actions on messages is tested in the
4121 queue_action() function. */
4123 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4125 sender_host_name = sender_host_address = interface_address =
4126 sender_ident = received_protocol = NULL;
4127 sender_host_port = interface_port = 0;
4128 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4131 /* If a sender host address is set, extract the optional port number off the
4132 end of it and check its syntax. Do the same thing for the interface address.
4133 Exim exits if the syntax is bad. */
4137 if (sender_host_address != NULL)
4138 sender_host_port = check_port(sender_host_address);
4139 if (interface_address != NULL)
4140 interface_port = check_port(interface_address);
4143 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4148 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4149 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4153 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4154 return EXIT_FAILURE;
4158 /* If an SMTP message is being received check to see if the standard input is a
4159 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4160 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4165 union sockaddr_46 inetd_sock;
4166 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4167 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4169 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4170 if (family == AF_INET || family == AF_INET6)
4172 union sockaddr_46 interface_sock;
4173 size = sizeof(interface_sock);
4175 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4176 interface_address = host_ntoa(-1, &interface_sock, NULL,
4179 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4181 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4184 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4185 NULL, &sender_host_port);
4186 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4187 "inetd is not supported when mua_wrapper is set");
4192 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4193 return EXIT_FAILURE;
4199 /* If the load average is going to be needed while receiving a message, get it
4200 now for those OS that require the first call to os_getloadavg() to be done as
4201 root. There will be further calls later for each message received. */
4203 #ifdef LOAD_AVG_NEEDS_ROOT
4204 if (receiving_message &&
4205 (queue_only_load >= 0 ||
4206 (is_inetd && smtp_load_reserve >= 0)
4209 load_average = OS_GETLOADAVG();
4213 /* The queue_only configuration option can be overridden by -odx on the command
4214 line, except that if queue_only_override is false, queue_only cannot be unset
4215 from the command line. */
4217 if (queue_only_set && (queue_only_override || arg_queue_only))
4218 queue_only = arg_queue_only;
4220 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4223 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4224 if (arg_smtp_receive_timeout >= 0)
4225 smtp_receive_timeout = arg_smtp_receive_timeout;
4227 /* If Exim was started with root privilege, unless we have already removed the
4228 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4229 except when starting the daemon or doing some kind of delivery or address
4230 testing (-bt). These are the only cases when root need to be retained. We run
4231 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4232 retained only for starting the daemon. We always do the initgroups() in this
4233 situation (controlled by the TRUE below), in order to be as close as possible
4234 to the state Exim usually runs in. */
4236 if (!unprivileged && /* originally had root AND */
4237 !removed_privilege && /* still got root AND */
4238 !daemon_listen && /* not starting the daemon */
4239 queue_interval <= 0 && /* (either kind of daemon) */
4241 deliver_drop_privilege || /* requested unprivileged */
4243 queue_interval < 0 && /* not running the queue */
4244 (msg_action_arg < 0 || /* and */
4245 msg_action != MSG_DELIVER) && /* not delivering and */
4246 (!checking || !address_test_mode) /* not address checking */
4250 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4253 /* When we are retaining a privileged uid, we still change to the exim gid. */
4258 rv = setgid(exim_gid);
4259 /* Impact of failure is that some stuff might end up with an incorrect group.
4260 We track this for failures from root, since any attempt to change privilege
4261 by root should succeed and failures should be examined. For non-root,
4262 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4263 no need to complain then. */
4266 if (!(unprivileged || removed_privilege))
4269 "exim: changing group failed: %s\n", strerror(errno));
4273 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4274 (long int)exim_gid, strerror(errno));
4278 /* Handle a request to scan a file for malware */
4279 if (malware_test_file)
4281 #ifdef WITH_CONTENT_SCAN
4283 set_process_info("scanning file for malware");
4284 result = malware_in_file(malware_test_file);
4287 printf("No malware found.\n");
4292 printf("Malware lookup returned non-okay/fail: %d\n", result);
4296 printf("Malware found: %s\n", malware_name);
4298 printf("Malware scan detected malware of unknown name.\n");
4300 printf("Malware scanning not enabled at compile time.\n");
4305 /* Handle a request to list the delivery queue */
4309 set_process_info("listing the queue");
4310 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4314 /* Handle a request to count the delivery queue */
4318 set_process_info("counting the queue");
4323 /* Handle actions on specific messages, except for the force delivery and
4324 message load actions, which are done below. Some actions take a whole list of
4325 message ids, which are known to continue up to the end of the arguments. Others
4326 take a single message id and then operate on the recipients list. */
4328 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4330 int yield = EXIT_SUCCESS;
4331 set_process_info("acting on specified messages");
4333 if (!one_msg_action)
4335 for (i = msg_action_arg; i < argc; i++)
4336 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4337 yield = EXIT_FAILURE;
4340 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4341 recipients_arg)) yield = EXIT_FAILURE;
4345 /* We used to set up here to skip reading the ACL section, on
4346 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4347 Now, since the intro of the ${acl } expansion, ACL definitions may be
4348 needed in transports so we lost the optimisation. */
4352 /* The configuration data will have been read into POOL_PERM because we won't
4353 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4354 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4355 configuration were read into POOL_MAIN, because we don't do any resets till
4356 later on. However, it seems right, and it does ensure that both pools get used.
4359 store_pool = POOL_MAIN;
4361 /* Handle the -brt option. This is for checking out retry configurations.
4362 The next three arguments are a domain name or a complete address, and
4363 optionally two error numbers. All it does is to call the function that
4364 scans the retry configuration data. */
4366 if (test_retry_arg >= 0)
4368 retry_config *yield;
4369 int basic_errno = 0;
4373 if (test_retry_arg >= argc)
4375 printf("-brt needs a domain or address argument\n");
4376 exim_exit(EXIT_FAILURE);
4378 s1 = argv[test_retry_arg++];
4381 /* If the first argument contains no @ and no . it might be a local user
4382 or it might be a single-component name. Treat as a domain. */
4384 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4386 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4387 "being \ntreated as a one-component domain, not as a local part.\n\n",
4391 /* There may be an optional second domain arg. */
4393 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4394 s2 = argv[test_retry_arg++];
4396 /* The final arg is an error name */
4398 if (test_retry_arg < argc)
4400 uschar *ss = argv[test_retry_arg];
4402 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4405 printf("%s\n", CS error);
4406 return EXIT_FAILURE;
4409 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4410 code > 100 as an error is for matching codes to the decade. Turn them into
4411 a real error code, off the decade. */
4413 if (basic_errno == ERRNO_MAIL4XX ||
4414 basic_errno == ERRNO_RCPT4XX ||
4415 basic_errno == ERRNO_DATA4XX)
4417 int code = (more_errno >> 8) & 255;
4419 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4420 else if (code > 100)
4421 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4425 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4426 if (yield == NULL) printf("No retry information found\n"); else
4429 more_errno = yield->more_errno;
4430 printf("Retry rule: %s ", yield->pattern);
4432 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4434 printf("quota%s%s ",
4435 (more_errno > 0)? "_" : "",
4436 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4438 else if (yield->basic_errno == ECONNREFUSED)
4440 printf("refused%s%s ",
4441 (more_errno > 0)? "_" : "",
4442 (more_errno == 'M')? "MX" :
4443 (more_errno == 'A')? "A" : "");
4445 else if (yield->basic_errno == ETIMEDOUT)
4448 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4450 if (more_errno != 0) printf("_%s",
4451 (more_errno == 'M')? "MX" : "A");
4454 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4455 printf("auth_failed ");
4458 for (r = yield->rules; r != NULL; r = r->next)
4460 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4461 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4467 printf(",%d.", x/1000);
4481 exim_exit(EXIT_SUCCESS);
4484 /* Handle a request to list one or more configuration options */
4485 /* If -n was set, we suppress some information */
4489 set_process_info("listing variables");
4490 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4491 else for (i = recipients_arg; i < argc; i++)
4494 (Ustrcmp(argv[i], "router") == 0 ||
4495 Ustrcmp(argv[i], "transport") == 0 ||
4496 Ustrcmp(argv[i], "authenticator") == 0 ||
4497 Ustrcmp(argv[i], "macro") == 0 ||
4498 Ustrcmp(argv[i], "environment") == 0))
4500 readconf_print(argv[i+1], argv[i], flag_n);
4503 else readconf_print(argv[i], NULL, flag_n);
4505 exim_exit(EXIT_SUCCESS);
4509 /* Handle a request to deliver one or more messages that are already on the
4510 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4511 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4513 Delivery of specific messages is typically used for a small number when
4514 prodding by hand (when the option forced_delivery will be set) or when
4515 re-execing to regain root privilege. Each message delivery must happen in a
4516 separate process, so we fork a process for each one, and run them sequentially
4517 so that debugging output doesn't get intertwined, and to avoid spawning too
4518 many processes if a long list is given. However, don't fork for the last one;
4519 this saves a process in the common case when Exim is called to deliver just one
4522 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4524 if (prod_requires_admin && !admin_user)
4526 fprintf(stderr, "exim: Permission denied\n");
4527 exim_exit(EXIT_FAILURE);
4529 set_process_info("delivering specified messages");
4530 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4531 for (i = msg_action_arg; i < argc; i++)
4536 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4537 else if ((pid = fork()) == 0)
4539 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4540 _exit(EXIT_SUCCESS);
4544 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4546 exim_exit(EXIT_FAILURE);
4550 exim_exit(EXIT_SUCCESS);
4554 /* If only a single queue run is requested, without SMTP listening, we can just
4555 turn into a queue runner, with an optional starting message id. */
4557 if (queue_interval == 0 && !daemon_listen)
4559 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4560 (start_queue_run_id == NULL)? US"" : US" starting at ",
4561 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4562 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4563 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4564 set_process_info("running the queue (single queue run)");
4565 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4566 exim_exit(EXIT_SUCCESS);
4570 /* Find the login name of the real user running this process. This is always
4571 needed when receiving a message, because it is written into the spool file. It
4572 may also be used to construct a from: or a sender: header, and in this case we
4573 need the user's full name as well, so save a copy of it, checked for RFC822
4574 syntax and munged if necessary, if it hasn't previously been set by the -F
4575 argument. We may try to get the passwd entry more than once, in case NIS or
4576 other delays are in evidence. Save the home directory for use in filter testing
4581 if ((pw = getpwuid(real_uid)) != NULL)
4583 originator_login = string_copy(US pw->pw_name);
4584 originator_home = string_copy(US pw->pw_dir);
4586 /* If user name has not been set by -F, set it from the passwd entry
4587 unless -f has been used to set the sender address by a trusted user. */
4589 if (originator_name == NULL)
4591 if (sender_address == NULL ||
4592 (!trusted_caller && filter_test == FTEST_NONE))
4594 uschar *name = US pw->pw_gecos;
4595 uschar *amp = Ustrchr(name, '&');
4598 /* Most Unix specify that a '&' character in the gecos field is
4599 replaced by a copy of the login name, and some even specify that
4600 the first character should be upper cased, so that's what we do. */
4605 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4606 amp - name, name, &loffset, originator_login, amp + 1);
4607 buffer[loffset] = toupper(buffer[loffset]);
4611 /* If a pattern for matching the gecos field was supplied, apply
4612 it and then expand the name string. */
4614 if (gecos_pattern != NULL && gecos_name != NULL)
4617 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4619 if (regex_match_and_setup(re, name, 0, -1))
4621 uschar *new_name = expand_string(gecos_name);
4623 if (new_name != NULL)
4625 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4626 "gecos field \"%s\"\n", new_name, name);
4629 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4630 "\"%s\": %s\n", gecos_name, expand_string_message);
4632 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4633 "gecos field \"%s\"\n", gecos_pattern, name);
4634 store_free((void *)re);
4636 originator_name = string_copy(name);
4639 /* A trusted caller has used -f but not -F */
4641 else originator_name = US"";
4644 /* Break the retry loop */
4649 if (++i > finduser_retries) break;
4653 /* If we cannot get a user login, log the incident and give up, unless the
4654 configuration specifies something to use. When running in the test harness,
4655 any setting of unknown_login overrides the actual name. */
4657 if (originator_login == NULL || running_in_test_harness)
4659 if (unknown_login != NULL)
4661 originator_login = expand_string(unknown_login);
4662 if (originator_name == NULL && unknown_username != NULL)
4663 originator_name = expand_string(unknown_username);
4664 if (originator_name == NULL) originator_name = US"";
4666 if (originator_login == NULL)
4667 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4671 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4674 originator_name = string_copy(parse_fix_phrase(originator_name,
4675 Ustrlen(originator_name), big_buffer, big_buffer_size));
4677 /* If a message is created by this call of Exim, the uid/gid of its originator
4678 are those of the caller. These values are overridden if an existing message is
4679 read in from the spool. */
4681 originator_uid = real_uid;
4682 originator_gid = real_gid;
4684 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4685 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4687 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4688 returns. We leave this till here so that the originator_ fields are available
4689 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4692 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4696 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4697 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4698 "mua_wrapper is set");
4703 /* If the sender ident has not been set (by a trusted caller) set it to
4704 the caller. This will get overwritten below for an inetd call. If a trusted
4705 caller has set it empty, unset it. */
4707 if (sender_ident == NULL) sender_ident = originator_login;
4708 else if (sender_ident[0] == 0) sender_ident = NULL;
4710 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4711 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4712 originator_* variables set. */
4714 if (test_rewrite_arg >= 0)
4716 really_exim = FALSE;
4717 if (test_rewrite_arg >= argc)
4719 printf("-brw needs an address argument\n");
4720 exim_exit(EXIT_FAILURE);
4722 rewrite_test(argv[test_rewrite_arg]);
4723 exim_exit(EXIT_SUCCESS);
4726 /* A locally-supplied message is considered to be coming from a local user
4727 unless a trusted caller supplies a sender address with -f, or is passing in the
4728 message via SMTP (inetd invocation or otherwise). */
4730 if ((sender_address == NULL && !smtp_input) ||
4731 (!trusted_caller && filter_test == FTEST_NONE))
4733 sender_local = TRUE;
4735 /* A trusted caller can supply authenticated_sender and authenticated_id
4736 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4737 defaults except when host checking. */
4739 if (authenticated_sender == NULL && !host_checking)
4740 authenticated_sender = string_sprintf("%s@%s", originator_login,
4741 qualify_domain_sender);
4742 if (authenticated_id == NULL && !host_checking)
4743 authenticated_id = originator_login;
4746 /* Trusted callers are always permitted to specify the sender address.
4747 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4748 is specified is the empty address. However, if a trusted caller does not
4749 specify a sender address for SMTP input, we leave sender_address unset. This
4750 causes the MAIL commands to be honoured. */
4752 if ((!smtp_input && sender_address == NULL) ||
4753 !receive_check_set_sender(sender_address))
4755 /* Either the caller is not permitted to set a general sender, or this is
4756 non-SMTP input and the trusted caller has not set a sender. If there is no
4757 sender, or if a sender other than <> is set, override with the originator's
4758 login (which will get qualified below), except when checking things. */
4760 if (sender_address == NULL /* No sender_address set */
4762 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4763 !checking && /* Not running tests, AND */
4764 filter_test == FTEST_NONE)) /* Not testing a filter */
4766 sender_address = originator_login;
4767 sender_address_forced = FALSE;
4768 sender_address_domain = 0;
4772 /* Remember whether an untrusted caller set the sender address */
4774 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4776 /* Ensure that the sender address is fully qualified unless it is the empty
4777 address, which indicates an error message, or doesn't exist (root caller, smtp
4778 interface, no -f argument). */
4780 if (sender_address != NULL && sender_address[0] != 0 &&
4781 sender_address_domain == 0)
4782 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4783 qualify_domain_sender);
4785 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4787 /* Handle a request to verify a list of addresses, or test them for delivery.
4788 This must follow the setting of the sender address, since routers can be
4789 predicated upon the sender. If no arguments are given, read addresses from
4790 stdin. Set debug_level to at least D_v to get full output for address testing.
4793 if (verify_address_mode || address_test_mode)
4796 int flags = vopt_qualify;
4798 if (verify_address_mode)
4800 if (!verify_as_sender) flags |= vopt_is_recipient;
4801 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4806 flags |= vopt_is_recipient;
4807 debug_selector |= D_v;
4808 debug_file = stderr;
4809 debug_fd = fileno(debug_file);
4810 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4813 if (recipients_arg < argc)
4815 while (recipients_arg < argc)
4817 uschar *s = argv[recipients_arg++];
4820 BOOL finished = FALSE;
4821 uschar *ss = parse_find_address_end(s, FALSE);
4822 if (*ss == ',') *ss = 0; else finished = TRUE;
4823 test_address(s, flags, &exit_value);
4826 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4833 uschar *s = get_stdinput(NULL, NULL);
4834 if (s == NULL) break;
4835 test_address(s, flags, &exit_value);
4839 exim_exit(exit_value);
4842 /* Handle expansion checking. Either expand items on the command line, or read
4843 from stdin if there aren't any. If -Mset was specified, load the message so
4844 that its variables can be used, but restrict this facility to admin users.
4845 Otherwise, if -bem was used, read a message from stdin. */
4849 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4851 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4854 fprintf(stderr, "exim: permission denied\n");
4857 message_id = argv[msg_action_arg];
4858 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4859 if (!spool_open_datafile(message_id))
4860 printf ("Failed to load message datafile %s\n", message_id);
4861 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4862 printf ("Failed to load message %s\n", message_id);
4865 /* Read a test message from a file. We fudge it up to be on stdin, saving
4866 stdin itself for later reading of expansion strings. */
4868 else if (expansion_test_message != NULL)
4870 int save_stdin = dup(0);
4871 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4874 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4876 return EXIT_FAILURE;
4879 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4880 message_ended = END_NOTENDED;
4881 read_message_body(receive_msg(extract_recipients));
4882 message_linecount += body_linecount;
4883 (void)dup2(save_stdin, 0);
4884 (void)close(save_stdin);
4885 clearerr(stdin); /* Required by Darwin */
4888 /* Allow $recipients for this testing */
4890 enable_dollar_recipients = TRUE;
4892 /* Expand command line items */
4894 if (recipients_arg < argc)
4896 while (recipients_arg < argc)
4898 uschar *s = argv[recipients_arg++];
4899 uschar *ss = expand_string(s);
4900 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4901 else printf("%s\n", CS ss);
4909 char *(*fn_readline)(const char *) = NULL;
4910 void (*fn_addhist)(const char *) = NULL;
4913 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4919 uschar *source = get_stdinput(fn_readline, fn_addhist);
4920 if (source == NULL) break;
4921 ss = expand_string(source);
4923 printf ("Failed: %s\n", expand_string_message);
4924 else printf("%s\n", CS ss);
4928 if (dlhandle != NULL) dlclose(dlhandle);
4932 /* The data file will be open after -Mset */
4934 if (deliver_datafile >= 0)
4936 (void)close(deliver_datafile);
4937 deliver_datafile = -1;
4940 exim_exit(EXIT_SUCCESS);
4944 /* The active host name is normally the primary host name, but it can be varied
4945 for hosts that want to play several parts at once. We need to ensure that it is
4946 set for host checking, and for receiving messages. */
4948 smtp_active_hostname = primary_hostname;
4949 if (raw_active_hostname != NULL)
4951 uschar *nah = expand_string(raw_active_hostname);
4954 if (!expand_string_forcedfail)
4955 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4956 "(smtp_active_hostname): %s", raw_active_hostname,
4957 expand_string_message);
4959 else if (nah[0] != 0) smtp_active_hostname = nah;
4962 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4963 given IP address so that the blocking and relay configuration can be tested.
4964 Unless a sender_ident was set by -oMt, we discard it (the default is the
4965 caller's login name). An RFC 1413 call is made only if we are running in the
4966 test harness and an incoming interface and both ports are specified, because
4967 there is no TCP/IP call to find the ident for. */
4974 if (!sender_ident_set)
4976 sender_ident = NULL;
4977 if (running_in_test_harness && sender_host_port != 0 &&
4978 interface_address != NULL && interface_port != 0)
4979 verify_get_ident(1413);
4982 /* In case the given address is a non-canonical IPv6 address, canonicize
4983 it. The code works for both IPv4 and IPv6, as it happens. */
4985 size = host_aton(sender_host_address, x);
4986 sender_host_address = store_get(48); /* large enough for full IPv6 */
4987 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4989 /* Now set up for testing */
4991 host_build_sender_fullhost();
4995 sender_local = FALSE;
4996 sender_host_notsocket = TRUE;
4997 debug_file = stderr;
4998 debug_fd = fileno(debug_file);
4999 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5000 "**** but without any ident (RFC 1413) callback.\n"
5001 "**** This is not for real!\n\n",
5002 sender_host_address);
5004 if (verify_check_host(&hosts_connection_nolog) == OK)
5005 log_write_selector &= ~L_smtp_connection;
5006 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5008 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5009 because a log line has already been written for all its failure exists
5010 (usually "connection refused: <reason>") and writing another one is
5011 unnecessary clutter. */
5013 if (smtp_start_session())
5015 reset_point = store_get(0);
5018 store_reset(reset_point);
5019 if (smtp_setup_msg() <= 0) break;
5020 if (!receive_msg(FALSE)) break;
5024 exim_exit(EXIT_SUCCESS);
5028 /* Arrange for message reception if recipients or SMTP were specified;
5029 otherwise complain unless a version print (-bV) happened or this is a filter
5030 verification test or info dump.
5031 In the former case, show the configuration file name. */
5033 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5035 if (version_printed)
5037 printf("Configuration file is %s\n", config_main_filename);
5038 return EXIT_SUCCESS;
5041 if (info_flag != CMDINFO_NONE)
5043 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5044 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5047 if (filter_test == FTEST_NONE)
5048 exim_usage(called_as);
5052 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5053 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5054 that we are not called from inetd, because that is rejected above. The
5055 following configuration settings are forced here:
5057 (1) Synchronous delivery (-odi)
5058 (2) Errors to stderr (-oep == -oeq)
5059 (3) No parallel remote delivery
5060 (4) Unprivileged delivery
5062 We don't force overall queueing options because there are several of them;
5063 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5064 to override any SMTP queueing. */
5068 synchronous_delivery = TRUE;
5069 arg_error_handling = ERRORS_STDERR;
5070 remote_max_parallel = 1;
5071 deliver_drop_privilege = TRUE;
5073 queue_smtp_domains = NULL;
5077 /* Prepare to accept one or more new messages on the standard input. When a
5078 message has been read, its id is returned in message_id[]. If doing immediate
5079 delivery, we fork a delivery process for each received message, except for the
5080 last one, where we can save a process switch.
5082 It is only in non-smtp mode that error_handling is allowed to be changed from
5083 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5084 sendmail error modes other than -oem ever actually used? Later: yes.) */
5086 if (!smtp_input) error_handling = arg_error_handling;
5088 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5089 logging being sent down the socket and make an identd call to get the
5094 (void)fclose(stderr);
5095 exim_nullstd(); /* Re-open to /dev/null */
5096 verify_get_ident(IDENT_PORT);
5097 host_build_sender_fullhost();
5098 set_process_info("handling incoming connection from %s via inetd",
5102 /* If the sender host address has been set, build sender_fullhost if it hasn't
5103 already been done (which it will have been for inetd). This caters for the
5104 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5105 so that the test for IP options is skipped for -bs input. */
5107 if (sender_host_address != NULL && sender_fullhost == NULL)
5109 host_build_sender_fullhost();
5110 set_process_info("handling incoming connection from %s via -oMa",
5112 sender_host_notsocket = TRUE;
5115 /* Otherwise, set the sender host as unknown except for inetd calls. This
5116 prevents host checking in the case of -bs not from inetd and also for -bS. */
5118 else if (!is_inetd) sender_host_unknown = TRUE;
5120 /* If stdout does not exist, then dup stdin to stdout. This can happen
5121 if exim is started from inetd. In this case fd 0 will be set to the socket,
5122 but fd 1 will not be set. This also happens for passed SMTP channels. */
5124 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5126 /* Set up the incoming protocol name and the state of the program. Root is
5127 allowed to force received protocol via the -oMr option above. If we have come
5128 via inetd, the process info has already been set up. We don't set
5129 received_protocol here for smtp input, as it varies according to
5130 batch/HELO/EHLO/AUTH/TLS. */
5134 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5135 smtp_batched_input? "batched " : "",
5136 (sender_address!= NULL)? sender_address : originator_login);
5140 if (received_protocol == NULL)
5141 received_protocol = string_sprintf("local%s", called_as);
5142 set_process_info("accepting a local non-SMTP message from <%s>",
5146 /* Initialize the session_local_queue-only flag (this will be ignored if
5147 mua_wrapper is set) */
5150 session_local_queue_only = queue_only;
5152 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5153 the spool if so configured. On failure, we must not attempt to send an error
5154 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5155 error code is given.) */
5157 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5159 fprintf(stderr, "exim: insufficient disk space\n");
5160 return EXIT_FAILURE;
5163 /* If this is smtp input of any kind, real or batched, handle the start of the
5166 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5167 because a log line has already been written for all its failure exists
5168 (usually "connection refused: <reason>") and writing another one is
5169 unnecessary clutter. */
5175 if (verify_check_host(&hosts_connection_nolog) == OK)
5176 log_write_selector &= ~L_smtp_connection;
5177 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5178 if (!smtp_start_session())
5181 exim_exit(EXIT_SUCCESS);
5185 /* Otherwise, set up the input size limit here. */
5189 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5190 if (expand_string_message != NULL)
5192 if (thismessage_size_limit == -1)
5193 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5194 "message_size_limit: %s", expand_string_message);
5196 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5197 "message_size_limit: %s", expand_string_message);
5201 /* Loop for several messages when reading SMTP input. If we fork any child
5202 processes, we don't want to wait for them unless synchronous delivery is
5203 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5204 same as SIG_DFL, despite the fact that documentation often lists the default as
5205 "ignore". This is a confusing area. This is what I know:
5207 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5208 processes that complete simply to go away without ever becoming defunct. You
5209 can't then wait for them - but we don't want to wait for them in the
5210 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5211 happen for all OS (e.g. *BSD is different).
5213 But that's not the end of the story. Some (many? all?) systems have the
5214 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5215 has by default, so it seems that the difference is merely one of default
5216 (compare restarting vs non-restarting signals).
5218 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5219 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5220 of the loop below. Paranoia rules.
5222 February 2003: That's *still* not the end of the story. There are now versions
5223 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5224 process then calls waitpid(), a grumble is written to the system log, because
5225 this is logically inconsistent. In other words, it doesn't like the paranoia.
5226 As a consequenc of this, the waitpid() below is now excluded if we are sure
5227 that SIG_IGN works. */
5229 if (!synchronous_delivery)
5232 struct sigaction act;
5233 act.sa_handler = SIG_IGN;
5234 sigemptyset(&(act.sa_mask));
5235 act.sa_flags = SA_NOCLDWAIT;
5236 sigaction(SIGCHLD, &act, NULL);
5238 signal(SIGCHLD, SIG_IGN);
5242 /* Save the current store pool point, for resetting at the start of
5243 each message, and save the real sender address, if any. */
5245 reset_point = store_get(0);
5246 real_sender_address = sender_address;
5248 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5249 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5254 store_reset(reset_point);
5257 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5258 input and build the recipients list, before calling receive_msg() to read the
5259 message proper. Whatever sender address is given in the SMTP transaction is
5260 often ignored for local senders - we use the actual sender, which is normally
5261 either the underlying user running this process or a -f argument provided by
5262 a trusted caller. It is saved in real_sender_address. The test for whether to
5263 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5268 if ((rc = smtp_setup_msg()) > 0)
5270 if (real_sender_address != NULL &&
5271 !receive_check_set_sender(sender_address))
5273 sender_address = raw_sender = real_sender_address;
5274 sender_address_unrewritten = NULL;
5277 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5278 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5279 the very end. The result of the ACL is ignored (as for other non-SMTP
5280 messages). It is run for its potential side effects. */
5282 if (smtp_batched_input && acl_not_smtp_start != NULL)
5284 uschar *user_msg, *log_msg;
5285 enable_dollar_recipients = TRUE;
5286 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5287 &user_msg, &log_msg);
5288 enable_dollar_recipients = FALSE;
5291 /* Now get the data for the message */
5293 more = receive_msg(extract_recipients);
5294 if (message_id[0] == 0)
5297 smtp_log_no_mail(); /* Log no mail if configured */
5298 exim_exit(EXIT_FAILURE);
5303 smtp_log_no_mail(); /* Log no mail if configured */
5304 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5308 /* In the non-SMTP case, we have all the information from the command
5309 line, but must process it in case it is in the more general RFC822
5310 format, and in any case, to detect syntax errors. Also, it appears that
5311 the use of comma-separated lists as single arguments is common, so we
5312 had better support them. */
5318 int count = argc - recipients_arg;
5319 uschar **list = argv + recipients_arg;
5321 /* These options cannot be changed dynamically for non-SMTP messages */
5323 active_local_sender_retain = local_sender_retain;
5324 active_local_from_check = local_from_check;
5326 /* Save before any rewriting */
5328 raw_sender = string_copy(sender_address);
5330 /* Loop for each argument */
5332 for (i = 0; i < count; i++)
5334 int start, end, domain;
5336 uschar *s = list[i];
5338 /* Loop for each comma-separated address */
5342 BOOL finished = FALSE;
5344 uschar *ss = parse_find_address_end(s, FALSE);
5346 if (*ss == ',') *ss = 0; else finished = TRUE;
5348 /* Check max recipients - if -t was used, these aren't recipients */
5350 if (recipients_max > 0 && ++rcount > recipients_max &&
5351 !extract_recipients)
5353 if (error_handling == ERRORS_STDERR)
5355 fprintf(stderr, "exim: too many recipients\n");
5356 exim_exit(EXIT_FAILURE);
5361 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5362 errors_sender_rc : EXIT_FAILURE;
5367 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5369 if (domain == 0 && !allow_unqualified_recipient)
5372 errmess = US"unqualified recipient address not allowed";
5375 if (recipient == NULL)
5377 if (error_handling == ERRORS_STDERR)
5379 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5380 string_printing(list[i]), errmess);
5381 exim_exit(EXIT_FAILURE);
5387 eblock.text1 = string_printing(list[i]);
5388 eblock.text2 = errmess;
5390 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5391 errors_sender_rc : EXIT_FAILURE;
5395 receive_add_recipient(recipient, -1);
5398 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5402 /* Show the recipients when debugging */
5407 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5408 if (recipients_list != NULL)
5410 debug_printf("Recipients:\n");
5411 for (i = 0; i < recipients_count; i++)
5412 debug_printf(" %s\n", recipients_list[i].address);
5416 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5417 ignored; rejecting here would just add complication, and it can just as
5418 well be done later. Allow $recipients to be visible in the ACL. */
5420 if (acl_not_smtp_start != NULL)
5422 uschar *user_msg, *log_msg;
5423 enable_dollar_recipients = TRUE;
5424 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5425 &user_msg, &log_msg);
5426 enable_dollar_recipients = FALSE;
5429 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5430 will just read the headers for the message, and not write anything onto the
5433 message_ended = END_NOTENDED;
5434 more = receive_msg(extract_recipients);
5436 /* more is always FALSE here (not SMTP message) when reading a message
5437 for real; when reading the headers of a message for filter testing,
5438 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5440 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5441 } /* Non-SMTP message reception */
5443 /* If this is a filter testing run, there are headers in store, but
5444 no message on the spool. Run the filtering code in testing mode, setting
5445 the domain to the qualify domain and the local part to the current user,
5446 unless they have been set by options. The prefix and suffix are left unset
5447 unless specified. The the return path is set to to the sender unless it has
5448 already been set from a return-path header in the message. */
5450 if (filter_test != FTEST_NONE)
5452 deliver_domain = (ftest_domain != NULL)?
5453 ftest_domain : qualify_domain_recipient;
5454 deliver_domain_orig = deliver_domain;
5455 deliver_localpart = (ftest_localpart != NULL)?
5456 ftest_localpart : originator_login;
5457 deliver_localpart_orig = deliver_localpart;
5458 deliver_localpart_prefix = ftest_prefix;
5459 deliver_localpart_suffix = ftest_suffix;
5460 deliver_home = originator_home;
5462 if (return_path == NULL)
5464 printf("Return-path copied from sender\n");
5465 return_path = string_copy(sender_address);
5469 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5471 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5473 receive_add_recipient(
5474 string_sprintf("%s%s%s@%s",
5475 (ftest_prefix == NULL)? US"" : ftest_prefix,
5477 (ftest_suffix == NULL)? US"" : ftest_suffix,
5478 deliver_domain), -1);
5480 printf("Recipient = %s\n", recipients_list[0].address);
5481 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5482 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5484 if (chdir("/")) /* Get away from wherever the user is running this from */
5486 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5487 exim_exit(EXIT_FAILURE);
5490 /* Now we run either a system filter test, or a user filter test, or both.
5491 In the latter case, headers added by the system filter will persist and be
5492 available to the user filter. We need to copy the filter variables
5495 if ((filter_test & FTEST_SYSTEM) != 0)
5497 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5498 exim_exit(EXIT_FAILURE);
5501 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5503 if ((filter_test & FTEST_USER) != 0)
5505 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5506 exim_exit(EXIT_FAILURE);
5509 exim_exit(EXIT_SUCCESS);
5512 /* Else act on the result of message reception. We should not get here unless
5513 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5514 will be TRUE. If it is not, check on the number of messages received in this
5517 if (!session_local_queue_only &&
5518 smtp_accept_queue_per_connection > 0 &&
5519 receive_messagecount > smtp_accept_queue_per_connection)
5521 session_local_queue_only = TRUE;
5522 queue_only_reason = 2;
5525 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5526 and queue_only_load is set, check that the load average is below it. If it is
5527 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5528 default), we put the whole session into queue_only mode. It then remains this
5529 way for any subsequent messages on the same SMTP connection. This is a
5530 deliberate choice; even though the load average may fall, it doesn't seem
5531 right to deliver later messages on the same call when not delivering earlier
5532 ones. However, there are odd cases where this is not wanted, so this can be
5533 changed by setting queue_only_load_latch false. */
5535 local_queue_only = session_local_queue_only;
5536 if (!local_queue_only && queue_only_load >= 0)
5538 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5539 if (local_queue_only)
5541 queue_only_reason = 3;
5542 if (queue_only_load_latch) session_local_queue_only = TRUE;
5546 /* If running as an MUA wrapper, all queueing options and freezing options
5550 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5552 /* Log the queueing here, when it will get a message id attached, but
5553 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5556 if (local_queue_only) switch(queue_only_reason)
5559 log_write(L_delay_delivery,
5560 LOG_MAIN, "no immediate delivery: more than %d messages "
5561 "received in one connection", smtp_accept_queue_per_connection);
5565 log_write(L_delay_delivery,
5566 LOG_MAIN, "no immediate delivery: load average %.2f",
5567 (double)load_average/1000.0);
5571 /* Else do the delivery unless the ACL or local_scan() called for queue only
5572 or froze the message. Always deliver in a separate process. A fork failure is
5573 not a disaster, as the delivery will eventually happen on a subsequent queue
5574 run. The search cache must be tidied before the fork, as the parent will
5575 do it before exiting. The child will trigger a lookup failure and
5576 thereby defer the delivery if it tries to use (for example) a cached ldap
5577 connection that the parent has called unbind on. */
5579 else if (!queue_only_policy && !deliver_freeze)
5584 if ((pid = fork()) == 0)
5587 close_unwanted(); /* Close unwanted file descriptors and TLS */
5588 exim_nullstd(); /* Ensure std{in,out,err} exist */
5590 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5591 mode, deliver_drop_privilege is forced TRUE). */
5593 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5595 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5597 /* Control does not return here. */
5600 /* No need to re-exec */
5602 rc = deliver_message(message_id, FALSE, FALSE);
5604 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5605 EXIT_SUCCESS : EXIT_FAILURE);
5610 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5611 "process: %s", strerror(errno));
5614 /* In the parent, wait if synchronous delivery is required. This will
5615 always be the case in MUA wrapper mode. */
5617 else if (synchronous_delivery)
5620 while (wait(&status) != pid);
5621 if ((status & 0x00ff) != 0)
5622 log_write(0, LOG_MAIN|LOG_PANIC,
5623 "process %d crashed with signal %d while delivering %s",
5624 (int)pid, status & 0x00ff, message_id);
5625 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5629 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5630 automatically reaps children (see comments above the loop), clear away any
5631 finished subprocesses here, in case there are lots of messages coming in
5632 from the same source. */
5634 #ifndef SIG_IGN_WORKS
5635 while (waitpid(-1, NULL, WNOHANG) > 0);
5639 exim_exit(EXIT_SUCCESS); /* Never returns */
5640 return 0; /* To stop compiler warning */