1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
136 int ovector[3*(EXPAND_MAXN+1)];
137 uschar * s = string_copy(subject); /* de-constifying */
138 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
139 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
141 if (n == 0) n = EXPAND_MAXN + 1;
145 expand_nmax = (setup < 0)? 0 : setup + 1;
146 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
148 expand_nstring[expand_nmax] = s + ovector[nn];
149 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 /*************************************************
160 * Set up processing details *
161 *************************************************/
163 /* Save a text string for dumping when SIGUSR1 is received.
164 Do checks for overruns.
166 Arguments: format and arguments, as for printf()
171 set_process_info(const char *format, ...)
175 sprintf(CS process_info, "%5d ", (int)getpid());
176 len = Ustrlen(process_info);
177 va_start(ap, format);
178 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
179 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
180 len = Ustrlen(process_info);
181 process_info[len+0] = '\n';
182 process_info[len+1] = '\0';
183 process_info_len = len + 1;
184 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
191 /*************************************************
192 * Handler for SIGUSR1 *
193 *************************************************/
195 /* SIGUSR1 causes any exim process to write to the process log details of
196 what it is currently doing. It will only be used if the OS is capable of
197 setting up a handler that causes automatic restarting of any system call
198 that is in progress at the time.
200 This function takes care to be signal-safe.
202 Argument: the signal number (SIGUSR1)
207 usr1_handler(int sig)
211 os_restarting_signal(sig, usr1_handler);
213 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
216 /* If we are already running as the Exim user, try to create it in the
217 current process (assuming spool_directory exists). Otherwise, if we are
218 root, do the creation in an exim:exim subprocess. */
220 int euid = geteuid();
221 if (euid == exim_uid)
222 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
223 else if (euid == root_uid)
224 fd = log_create_as_exim(process_log_path);
227 /* If we are neither exim nor root, or if we failed to create the log file,
228 give up. There is not much useful we can do with errors, since we don't want
229 to disrupt whatever is going on outside the signal handler. */
233 (void)write(fd, process_info, process_info_len);
239 /*************************************************
241 *************************************************/
243 /* This handler is enabled most of the time that Exim is running. The handler
244 doesn't actually get used unless alarm() has been called to set a timer, to
245 place a time limit on a system call of some kind. When the handler is run, it
248 There are some other SIGALRM handlers that are used in special cases when more
249 than just a flag setting is required; for example, when reading a message's
250 input. These are normally set up in the code module that uses them, and the
251 SIGALRM handler is reset to this one afterwards.
253 Argument: the signal value (SIGALRM)
258 sigalrm_handler(int sig)
260 sig = sig; /* Keep picky compilers happy */
262 os_non_restarting_signal(SIGALRM, sigalrm_handler);
267 /*************************************************
268 * Sleep for a fractional time interval *
269 *************************************************/
271 /* This function is called by millisleep() and exim_wait_tick() to wait for a
272 period of time that may include a fraction of a second. The coding is somewhat
273 tedious. We do not expect setitimer() ever to fail, but if it does, the process
274 will wait for ever, so we panic in this instance. (There was a case of this
275 when a bug in a function that calls milliwait() caused it to pass invalid data.
276 That's when I added the check. :-)
278 We assume it to be not worth sleeping for under 100us; this value will
279 require revisiting as hardware advances. This avoids the issue of
280 a zero-valued timer setting meaning "never fire".
282 Argument: an itimerval structure containing the interval
287 milliwait(struct itimerval *itval)
290 sigset_t old_sigmask;
292 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
294 (void)sigemptyset(&sigmask); /* Empty mask */
295 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
296 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
297 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
298 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
299 "setitimer() failed: %s", strerror(errno));
300 (void)sigfillset(&sigmask); /* All signals */
301 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
302 (void)sigsuspend(&sigmask); /* Until SIGALRM */
303 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
309 /*************************************************
310 * Millisecond sleep function *
311 *************************************************/
313 /* The basic sleep() function has a granularity of 1 second, which is too rough
314 in some cases - for example, when using an increasing delay to slow down
317 Argument: number of millseconds
324 struct itimerval itval;
325 itval.it_interval.tv_sec = 0;
326 itval.it_interval.tv_usec = 0;
327 itval.it_value.tv_sec = msec/1000;
328 itval.it_value.tv_usec = (msec % 1000) * 1000;
334 /*************************************************
335 * Compare microsecond times *
336 *************************************************/
343 Returns: -1, 0, or +1
347 exim_tvcmp(struct timeval *t1, struct timeval *t2)
349 if (t1->tv_sec > t2->tv_sec) return +1;
350 if (t1->tv_sec < t2->tv_sec) return -1;
351 if (t1->tv_usec > t2->tv_usec) return +1;
352 if (t1->tv_usec < t2->tv_usec) return -1;
359 /*************************************************
360 * Clock tick wait function *
361 *************************************************/
363 /* Exim uses a time + a pid to generate a unique identifier in two places: its
364 message IDs, and in file names for maildir deliveries. Because some OS now
365 re-use pids within the same second, sub-second times are now being used.
366 However, for absolute certaintly, we must ensure the clock has ticked before
367 allowing the relevant process to complete. At the time of implementation of
368 this code (February 2003), the speed of processors is such that the clock will
369 invariably have ticked already by the time a process has done its job. This
370 function prepares for the time when things are faster - and it also copes with
371 clocks that go backwards.
374 then_tv A timeval which was used to create uniqueness; its usec field
375 has been rounded down to the value of the resolution.
376 We want to be sure the current time is greater than this.
377 resolution The resolution that was used to divide the microseconds
378 (1 for maildir, larger for message ids)
384 exim_wait_tick(struct timeval *then_tv, int resolution)
386 struct timeval now_tv;
387 long int now_true_usec;
389 (void)gettimeofday(&now_tv, NULL);
390 now_true_usec = now_tv.tv_usec;
391 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
393 if (exim_tvcmp(&now_tv, then_tv) <= 0)
395 struct itimerval itval;
396 itval.it_interval.tv_sec = 0;
397 itval.it_interval.tv_usec = 0;
398 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
399 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
401 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
402 negative value for the microseconds is possible only in the case when "now"
403 is more than a second less than "then". That means that itval.it_value.tv_sec
404 is greater than zero. The following correction is therefore safe. */
406 if (itval.it_value.tv_usec < 0)
408 itval.it_value.tv_usec += 1000000;
409 itval.it_value.tv_sec -= 1;
412 DEBUG(D_transport|D_receive)
414 if (!running_in_test_harness)
416 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
417 then_tv->tv_sec, (long) then_tv->tv_usec,
418 now_tv.tv_sec, (long) now_tv.tv_usec);
419 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
420 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
431 /*************************************************
432 * Call fopen() with umask 777 and adjust mode *
433 *************************************************/
435 /* Exim runs with umask(0) so that files created with open() have the mode that
436 is specified in the open() call. However, there are some files, typically in
437 the spool directory, that are created with fopen(). They end up world-writeable
438 if no precautions are taken. Although the spool directory is not accessible to
439 the world, this is an untidiness. So this is a wrapper function for fopen()
440 that sorts out the mode of the created file.
443 filename the file name
444 options the fopen() options
445 mode the required mode
447 Returns: the fopened FILE or NULL
451 modefopen(const uschar *filename, const char *options, mode_t mode)
453 mode_t saved_umask = umask(0777);
454 FILE *f = Ufopen(filename, options);
455 (void)umask(saved_umask);
456 if (f != NULL) (void)fchmod(fileno(f), mode);
463 /*************************************************
464 * Ensure stdin, stdout, and stderr exist *
465 *************************************************/
467 /* Some operating systems grumble if an exec() happens without a standard
468 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
469 file will be opened and will use these fd values, and then some other bit of
470 code will assume, for example, that it can write error messages to stderr.
471 This function ensures that fds 0, 1, and 2 are open if they do not already
472 exist, by connecting them to /dev/null.
474 This function is also used to ensure that std{in,out,err} exist at all times,
475 so that if any library that Exim calls tries to use them, it doesn't crash.
487 for (i = 0; i <= 2; i++)
489 if (fstat(i, &statbuf) < 0 && errno == EBADF)
491 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
492 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
493 string_open_failed(errno, "/dev/null"));
494 if (devnull != i) (void)dup2(devnull, i);
497 if (devnull > 2) (void)close(devnull);
503 /*************************************************
504 * Close unwanted file descriptors for delivery *
505 *************************************************/
507 /* This function is called from a new process that has been forked to deliver
508 an incoming message, either directly, or using exec.
510 We want any smtp input streams to be closed in this new process. However, it
511 has been observed that using fclose() here causes trouble. When reading in -bS
512 input, duplicate copies of messages have been seen. The files will be sharing a
513 file pointer with the parent process, and it seems that fclose() (at least on
514 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
515 least sometimes. Hence we go for closing the underlying file descriptors.
517 If TLS is active, we want to shut down the TLS library, but without molesting
518 the parent's SSL connection.
520 For delivery of a non-SMTP message, we want to close stdin and stdout (and
521 stderr unless debugging) because the calling process might have set them up as
522 pipes and be waiting for them to close before it waits for the submission
523 process to terminate. If they aren't closed, they hold up the calling process
524 until the initial delivery process finishes, which is not what we want.
526 Exception: We do want it for synchronous delivery!
528 And notwithstanding all the above, if D_resolver is set, implying resolver
529 debugging, leave stdout open, because that's where the resolver writes its
532 When we close stderr (which implies we've also closed stdout), we also get rid
533 of any controlling terminal.
545 tls_close(TRUE, FALSE); /* Shut down the TLS library */
547 (void)close(fileno(smtp_in));
548 (void)close(fileno(smtp_out));
553 (void)close(0); /* stdin */
554 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
555 if (debug_selector == 0) /* stderr */
557 if (!synchronous_delivery)
570 /*************************************************
572 *************************************************/
574 /* This function sets a new uid and gid permanently, optionally calling
575 initgroups() to set auxiliary groups. There are some special cases when running
576 Exim in unprivileged modes. In these situations the effective uid will not be
577 root; if we already have the right effective uid/gid, and don't need to
578 initialize any groups, leave things as they are.
583 igflag TRUE if initgroups() wanted
584 msg text to use in debugging output and failure log
586 Returns: nothing; bombs out on failure
590 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
592 uid_t euid = geteuid();
593 gid_t egid = getegid();
595 if (euid == root_uid || euid != uid || egid != gid || igflag)
597 /* At least one OS returns +1 for initgroups failure, so just check for
602 struct passwd *pw = getpwuid(uid);
605 if (initgroups(pw->pw_name, gid) != 0)
606 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
607 (long int)uid, strerror(errno));
609 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
610 "no passwd entry for uid=%ld", (long int)uid);
613 if (setgid(gid) < 0 || setuid(uid) < 0)
615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
616 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
620 /* Debugging output included uid/gid and all groups */
624 int group_count, save_errno;
625 gid_t group_list[NGROUPS_MAX];
626 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
627 (long int)geteuid(), (long int)getegid(), (long int)getpid());
628 group_count = getgroups(NGROUPS_MAX, group_list);
630 debug_printf(" auxiliary group list:");
634 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
636 else if (group_count < 0)
637 debug_printf(" <error: %s>", strerror(save_errno));
638 else debug_printf(" <none>");
646 /*************************************************
648 *************************************************/
650 /* Exim exits via this function so that it always clears up any open
656 Returns: does not return
664 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
665 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
672 /*************************************************
673 * Extract port from host address *
674 *************************************************/
676 /* Called to extract the port from the values given to -oMa and -oMi.
677 It also checks the syntax of the address, and terminates it before the
678 port data when a port is extracted.
681 address the address, with possible port on the end
683 Returns: the port, or zero if there isn't one
684 bombs out on a syntax error
688 check_port(uschar *address)
690 int port = host_address_extract_port(address);
691 if (string_is_ip_address(address, NULL) == 0)
693 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
701 /*************************************************
702 * Test/verify an address *
703 *************************************************/
705 /* This function is called by the -bv and -bt code. It extracts a working
706 address from a full RFC 822 address. This isn't really necessary per se, but it
707 has the effect of collapsing source routes.
711 flags flag bits for verify_address()
712 exit_value to be set for failures
718 test_address(uschar *s, int flags, int *exit_value)
720 int start, end, domain;
721 uschar *parse_error = NULL;
722 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
726 fprintf(stdout, "syntax error: %s\n", parse_error);
731 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
732 -1, -1, NULL, NULL, NULL);
733 if (rc == FAIL) *exit_value = 2;
734 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
740 /*************************************************
741 * Show supported features *
742 *************************************************/
744 /* This function is called for -bV/--version and for -d to output the optional
745 features of the current Exim binary.
747 Arguments: a FILE for printing
752 show_whats_supported(FILE *f)
756 #ifdef DB_VERSION_STRING
757 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
758 #elif defined(BTREEVERSION) && defined(HASHVERSION)
760 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
762 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
764 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
765 fprintf(f, "Probably ndbm\n");
766 #elif defined(USE_TDB)
767 fprintf(f, "Using tdb\n");
770 fprintf(f, "Probably GDBM (native mode)\n");
772 fprintf(f, "Probably GDBM (compatibility mode)\n");
776 fprintf(f, "Support for:");
777 #ifdef SUPPORT_CRYPTEQ
778 fprintf(f, " crypteq");
781 fprintf(f, " iconv()");
786 #ifdef HAVE_SETCLASSRESOURCES
787 fprintf(f, " use_setclassresources");
796 fprintf(f, " Expand_dlfunc");
798 #ifdef USE_TCP_WRAPPERS
799 fprintf(f, " TCPwrappers");
803 fprintf(f, " GnuTLS");
805 fprintf(f, " OpenSSL");
808 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
809 fprintf(f, " translate_ip_address");
811 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
812 fprintf(f, " move_frozen_messages");
814 #ifdef WITH_CONTENT_SCAN
815 fprintf(f, " Content_Scanning");
820 #ifndef DISABLE_DNSSEC
821 fprintf(f, " DNSSEC");
823 #ifndef DISABLE_EVENT
824 fprintf(f, " Event");
836 fprintf(f, " PROXY");
839 fprintf(f, " SOCKS");
841 #ifdef EXPERIMENTAL_SPF
842 fprintf(f, " Experimental_SPF");
844 #ifdef EXPERIMENTAL_SRS
845 fprintf(f, " Experimental_SRS");
847 #ifdef EXPERIMENTAL_BRIGHTMAIL
848 fprintf(f, " Experimental_Brightmail");
850 #ifdef EXPERIMENTAL_DANE
851 fprintf(f, " Experimental_DANE");
853 #ifdef EXPERIMENTAL_DCC
854 fprintf(f, " Experimental_DCC");
856 #ifdef EXPERIMENTAL_DMARC
857 fprintf(f, " Experimental_DMARC");
859 #ifdef EXPERIMENTAL_DSN_INFO
860 fprintf(f, " Experimental_DSN_info");
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_REDIS) && LOOKUP_REDIS!=2
905 fprintf(f, " redis");
907 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
908 fprintf(f, " sqlite");
910 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
911 fprintf(f, " testdb");
913 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
914 fprintf(f, " whoson");
918 fprintf(f, "Authenticators:");
920 fprintf(f, " cram_md5");
922 #ifdef AUTH_CYRUS_SASL
923 fprintf(f, " cyrus_sasl");
926 fprintf(f, " dovecot");
929 fprintf(f, " gsasl");
931 #ifdef AUTH_HEIMDAL_GSSAPI
932 fprintf(f, " heimdal_gssapi");
934 #ifdef AUTH_PLAINTEXT
935 fprintf(f, " plaintext");
945 fprintf(f, "Routers:");
947 fprintf(f, " accept");
949 #ifdef ROUTER_DNSLOOKUP
950 fprintf(f, " dnslookup");
952 #ifdef ROUTER_IPLITERAL
953 fprintf(f, " ipliteral");
955 #ifdef ROUTER_IPLOOKUP
956 fprintf(f, " iplookup");
958 #ifdef ROUTER_MANUALROUTE
959 fprintf(f, " manualroute");
961 #ifdef ROUTER_QUERYPROGRAM
962 fprintf(f, " queryprogram");
964 #ifdef ROUTER_REDIRECT
965 fprintf(f, " redirect");
969 fprintf(f, "Transports:");
970 #ifdef TRANSPORT_APPENDFILE
971 fprintf(f, " appendfile");
972 #ifdef SUPPORT_MAILDIR
973 fprintf(f, "/maildir");
975 #ifdef SUPPORT_MAILSTORE
976 fprintf(f, "/mailstore");
982 #ifdef TRANSPORT_AUTOREPLY
983 fprintf(f, " autoreply");
985 #ifdef TRANSPORT_LMTP
988 #ifdef TRANSPORT_PIPE
991 #ifdef TRANSPORT_SMTP
996 if (fixed_never_users[0] > 0)
999 fprintf(f, "Fixed never_users: ");
1000 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1001 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1002 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1005 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1007 /* Everything else is details which are only worth reporting when debugging.
1008 Perhaps the tls_version_report should move into this too. */
1013 /* clang defines __GNUC__ (at least, for me) so test for it first */
1014 #if defined(__clang__)
1015 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1016 #elif defined(__GNUC__)
1017 fprintf(f, "Compiler: GCC [%s]\n",
1021 "? unknown version ?"
1025 fprintf(f, "Compiler: <unknown>\n");
1029 tls_version_report(f);
1032 utf8_version_report(f);
1035 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1036 if (authi->version_report)
1037 (*authi->version_report)(f);
1039 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1040 characters; unless it's an ancient version of PCRE in which case it
1042 #ifndef PCRE_PRERELEASE
1043 #define PCRE_PRERELEASE
1046 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1047 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1049 PCRE_MAJOR, PCRE_MINOR,
1050 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1053 #undef EXPAND_AND_QUOTE
1056 for (i = 0; i < lookup_list_count; i++)
1057 if (lookup_list[i]->version_report)
1058 lookup_list[i]->version_report(f);
1060 #ifdef WHITELIST_D_MACROS
1061 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1063 fprintf(f, "WHITELIST_D_MACROS unset\n");
1065 #ifdef TRUSTED_CONFIG_LIST
1066 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1068 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1075 /*************************************************
1076 * Show auxiliary information about Exim *
1077 *************************************************/
1080 show_exim_information(enum commandline_info request, FILE *stream)
1087 fprintf(stream, "Oops, something went wrong.\n");
1091 "The -bI: flag takes a string indicating which information to provide.\n"
1092 "If the string is not recognised, you'll get this help (on stderr).\n"
1094 " exim -bI:help this information\n"
1095 " exim -bI:dscp dscp value keywords known\n"
1096 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1100 for (pp = exim_sieve_extension_list; *pp; ++pp)
1101 fprintf(stream, "%s\n", *pp);
1104 dscp_list_to_stream(stream);
1110 /*************************************************
1111 * Quote a local part *
1112 *************************************************/
1114 /* This function is used when a sender address or a From: or Sender: header
1115 line is being created from the caller's login, or from an authenticated_id. It
1116 applies appropriate quoting rules for a local part.
1118 Argument: the local part
1119 Returns: the local part, quoted if necessary
1123 local_part_quote(uschar *lpart)
1125 BOOL needs_quote = FALSE;
1130 for (t = lpart; !needs_quote && *t != 0; t++)
1132 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1133 (*t != '.' || t == lpart || t[1] == 0);
1136 if (!needs_quote) return lpart;
1139 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1143 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1146 yield = string_cat(yield, &size, &ptr, lpart);
1149 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1150 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1151 yield = string_catn(yield, &size, &ptr, nq, 1);
1155 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1163 /*************************************************
1164 * Load readline() functions *
1165 *************************************************/
1167 /* This function is called from testing executions that read data from stdin,
1168 but only when running as the calling user. Currently, only -be does this. The
1169 function loads the readline() function library and passes back the functions.
1170 On some systems, it needs the curses library, so load that too, but try without
1171 it if loading fails. All this functionality has to be requested at build time.
1174 fn_readline_ptr pointer to where to put the readline pointer
1175 fn_addhist_ptr pointer to where to put the addhistory function
1177 Returns: the dlopen handle or NULL on failure
1181 set_readline(char * (**fn_readline_ptr)(const char *),
1182 void (**fn_addhist_ptr)(const char *))
1185 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1187 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1188 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1190 if (dlhandle != NULL)
1192 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1193 * char * readline (const char *prompt);
1194 * void add_history (const char *string);
1196 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1197 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1201 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1210 /*************************************************
1211 * Get a line from stdin for testing things *
1212 *************************************************/
1214 /* This function is called when running tests that can take a number of lines
1215 of input (for example, -be and -bt). It handles continuations and trailing
1216 spaces. And prompting and a blank line output on eof. If readline() is in use,
1217 the arguments are non-NULL and provide the relevant functions.
1220 fn_readline readline function or NULL
1221 fn_addhist addhist function or NULL
1223 Returns: pointer to dynamic memory, or NULL at end of file
1227 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1232 uschar *yield = NULL;
1234 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1238 uschar buffer[1024];
1242 char *readline_line = NULL;
1243 if (fn_readline != NULL)
1245 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1246 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1247 p = US readline_line;
1252 /* readline() not in use */
1255 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1259 /* Handle the line */
1261 ss = p + (int)Ustrlen(p);
1262 while (ss > p && isspace(ss[-1])) ss--;
1266 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1269 yield = string_catn(yield, &size, &ptr, p, ss - p);
1272 if (fn_readline != NULL) free(readline_line);
1275 /* yield can only be NULL if ss==p */
1276 if (ss == p || yield[ptr-1] != '\\')
1278 if (yield) yield[ptr] = 0;
1284 if (yield == NULL) printf("\n");
1290 /*************************************************
1291 * Output usage information for the program *
1292 *************************************************/
1294 /* This function is called when there are no recipients
1295 or a specific --help argument was added.
1298 progname information on what name we were called by
1300 Returns: DOES NOT RETURN
1304 exim_usage(uschar *progname)
1307 /* Handle specific program invocation varients */
1308 if (Ustrcmp(progname, US"-mailq") == 0)
1311 "mailq - list the contents of the mail queue\n\n"
1312 "For a list of options, see the Exim documentation.\n");
1316 /* Generic usage - we output this whatever happens */
1318 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1319 "not directly from a shell command line. Options and/or arguments control\n"
1320 "what it does when called. For a list of options, see the Exim documentation.\n");
1327 /*************************************************
1328 * Validate that the macros given are okay *
1329 *************************************************/
1331 /* Typically, Exim will drop privileges if macros are supplied. In some
1332 cases, we want to not do so.
1334 Arguments: none (macros is a global)
1335 Returns: true if trusted, false otherwise
1339 macros_trusted(void)
1341 #ifdef WHITELIST_D_MACROS
1343 uschar *whitelisted, *end, *p, **whites, **w;
1344 int white_count, i, n;
1346 BOOL prev_char_item, found;
1351 #ifndef WHITELIST_D_MACROS
1355 /* We only trust -D overrides for some invoking users:
1356 root, the exim run-time user, the optional config owner user.
1357 I don't know why config-owner would be needed, but since they can own the
1358 config files anyway, there's no security risk to letting them override -D. */
1359 if ( ! ((real_uid == root_uid)
1360 || (real_uid == exim_uid)
1361 #ifdef CONFIGURE_OWNER
1362 || (real_uid == config_uid)
1366 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1370 /* Get a list of macros which are whitelisted */
1371 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1372 prev_char_item = FALSE;
1374 for (p = whitelisted; *p != '\0'; ++p)
1376 if (*p == ':' || isspace(*p))
1381 prev_char_item = FALSE;
1384 if (!prev_char_item)
1385 prev_char_item = TRUE;
1392 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1393 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1398 if (i == white_count)
1400 while (*p != '\0' && p < end)
1406 /* The list of macros should be very short. Accept the N*M complexity. */
1407 for (m = macros; m != NULL; m = m->next)
1410 for (w = whites; *w; ++w)
1411 if (Ustrcmp(*w, m->name) == 0)
1418 if (m->replacement == NULL)
1420 len = Ustrlen(m->replacement);
1423 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1424 0, PCRE_EOPT, NULL, 0);
1427 if (n != PCRE_ERROR_NOMATCH)
1428 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1432 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1438 /*************************************************
1439 * Entry point and high-level code *
1440 *************************************************/
1442 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1443 the appropriate action. All the necessary functions are present in the one
1444 binary. I originally thought one should split it up, but it turns out that so
1445 much of the apparatus is needed in each chunk that one might as well just have
1446 it all available all the time, which then makes the coding easier as well.
1449 argc count of entries in argv
1450 argv argument strings, with argv[0] being the program name
1452 Returns: EXIT_SUCCESS if terminated successfully
1453 EXIT_FAILURE otherwise, except when a message has been sent
1454 to the sender, and -oee was given
1458 main(int argc, char **cargv)
1460 uschar **argv = USS cargv;
1461 int arg_receive_timeout = -1;
1462 int arg_smtp_receive_timeout = -1;
1463 int arg_error_handling = error_handling;
1464 int filter_sfd = -1;
1465 int filter_ufd = -1;
1468 int list_queue_option = 0;
1470 int msg_action_arg = -1;
1471 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1472 int queue_only_reason = 0;
1474 int perl_start_option = 0;
1476 int recipients_arg = argc;
1477 int sender_address_domain = 0;
1478 int test_retry_arg = -1;
1479 int test_rewrite_arg = -1;
1480 BOOL arg_queue_only = FALSE;
1481 BOOL bi_option = FALSE;
1482 BOOL checking = FALSE;
1483 BOOL count_queue = FALSE;
1484 BOOL expansion_test = FALSE;
1485 BOOL extract_recipients = FALSE;
1486 BOOL flag_G = FALSE;
1487 BOOL flag_n = FALSE;
1488 BOOL forced_delivery = FALSE;
1489 BOOL f_end_dot = FALSE;
1490 BOOL deliver_give_up = FALSE;
1491 BOOL list_queue = FALSE;
1492 BOOL list_options = FALSE;
1493 BOOL list_config = FALSE;
1494 BOOL local_queue_only;
1496 BOOL one_msg_action = FALSE;
1497 BOOL queue_only_set = FALSE;
1498 BOOL receiving_message = TRUE;
1499 BOOL sender_ident_set = FALSE;
1500 BOOL session_local_queue_only;
1502 BOOL removed_privilege = FALSE;
1503 BOOL usage_wanted = FALSE;
1504 BOOL verify_address_mode = FALSE;
1505 BOOL verify_as_sender = FALSE;
1506 BOOL version_printed = FALSE;
1507 uschar *alias_arg = NULL;
1508 uschar *called_as = US"";
1509 uschar *cmdline_syslog_name = NULL;
1510 uschar *start_queue_run_id = NULL;
1511 uschar *stop_queue_run_id = NULL;
1512 uschar *expansion_test_message = NULL;
1513 uschar *ftest_domain = NULL;
1514 uschar *ftest_localpart = NULL;
1515 uschar *ftest_prefix = NULL;
1516 uschar *ftest_suffix = NULL;
1517 uschar *log_oneline = NULL;
1518 uschar *malware_test_file = NULL;
1519 uschar *real_sender_address;
1520 uschar *originator_home = US"/";
1525 struct stat statbuf;
1526 pid_t passed_qr_pid = (pid_t)0;
1527 int passed_qr_pipe = -1;
1528 gid_t group_list[NGROUPS_MAX];
1530 /* For the -bI: flag */
1531 enum commandline_info info_flag = CMDINFO_NONE;
1532 BOOL info_stdout = FALSE;
1534 /* Possible options for -R and -S */
1536 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1538 /* Need to define this in case we need to change the environment in order
1539 to get rid of a bogus time zone. We have to make it char rather than uschar
1540 because some OS define it in /usr/include/unistd.h. */
1542 extern char **environ;
1544 /* If the Exim user and/or group and/or the configuration file owner/group were
1545 defined by ref:name at build time, we must now find the actual uid/gid values.
1546 This is a feature to make the lives of binary distributors easier. */
1548 #ifdef EXIM_USERNAME
1549 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1553 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1557 /* If ref:name uses a number as the name, route_finduser() returns
1558 TRUE with exim_uid set and pw coerced to NULL. */
1560 exim_gid = pw->pw_gid;
1561 #ifndef EXIM_GROUPNAME
1565 "exim: ref:name should specify a usercode, not a group.\n"
1566 "exim: can't let you get away with it unless you also specify a group.\n");
1573 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1579 #ifdef EXIM_GROUPNAME
1580 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1582 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1588 #ifdef CONFIGURE_OWNERNAME
1589 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1591 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1592 CONFIGURE_OWNERNAME);
1597 /* We default the system_filter_user to be the Exim run-time user, as a
1598 sane non-root value. */
1599 system_filter_uid = exim_uid;
1601 #ifdef CONFIGURE_GROUPNAME
1602 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1604 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1605 CONFIGURE_GROUPNAME);
1610 /* In the Cygwin environment, some initialization used to need doing.
1611 It was fudged in by means of this macro; now no longer but we'll leave
1612 it in case of others. */
1618 /* Check a field which is patched when we are running Exim within its
1619 testing harness; do a fast initial check, and then the whole thing. */
1621 running_in_test_harness =
1622 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1624 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1625 at the start of a program; however, it seems that some environments do not
1626 follow this. A "strange" locale can affect the formatting of timestamps, so we
1629 setlocale(LC_ALL, "C");
1631 /* Set up the default handler for timing using alarm(). */
1633 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1635 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1636 because store_malloc writes a log entry on failure. */
1638 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1639 if (log_buffer == NULL)
1641 fprintf(stderr, "exim: failed to get store for log buffer\n");
1645 /* Initialize the default log options. */
1647 bits_set(log_selector, log_selector_size, log_default);
1649 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1650 NULL when the daemon is run and the file is closed. We have to use this
1651 indirection, because some systems don't allow writing to the variable "stderr".
1654 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1656 /* Arrange for the PCRE regex library to use our store functions. Note that
1657 the normal calls are actually macros that add additional arguments for
1658 debugging purposes so we have to assign specially constructed functions here.
1659 The default is to use store in the stacking pool, but this is overridden in the
1660 regex_must_compile() function. */
1662 pcre_malloc = function_store_get;
1663 pcre_free = function_dummy_free;
1665 /* Ensure there is a big buffer for temporary use in several places. It is put
1666 in malloc store so that it can be freed for enlargement if necessary. */
1668 big_buffer = store_malloc(big_buffer_size);
1670 /* Set up the handler for the data request signal, and set the initial
1671 descriptive text. */
1673 set_process_info("initializing");
1674 os_restarting_signal(SIGUSR1, usr1_handler);
1676 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1677 in the daemon code. For the rest of Exim's uses, we ignore it. */
1679 signal(SIGHUP, SIG_IGN);
1681 /* We don't want to die on pipe errors as the code is written to handle
1682 the write error instead. */
1684 signal(SIGPIPE, SIG_IGN);
1686 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1687 set to SIG_IGN. This causes subprocesses that complete before the parent
1688 process waits for them not to hang around, so when Exim calls wait(), nothing
1689 is there. The wait() code has been made robust against this, but let's ensure
1690 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1691 ending status. We use sigaction rather than plain signal() on those OS where
1692 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1693 problem on AIX with this.) */
1697 struct sigaction act;
1698 act.sa_handler = SIG_DFL;
1699 sigemptyset(&(act.sa_mask));
1701 sigaction(SIGCHLD, &act, NULL);
1704 signal(SIGCHLD, SIG_DFL);
1707 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1712 /* Set up the version number. Set up the leading 'E' for the external form of
1713 message ids, set the pointer to the internal form, and initialize it to
1714 indicate no message being processed. */
1717 message_id_option[0] = '-';
1718 message_id_external = message_id_option + 1;
1719 message_id_external[0] = 'E';
1720 message_id = message_id_external + 1;
1723 /* Set the umask to zero so that any files Exim creates using open() are
1724 created with the modes that it specifies. NOTE: Files created with fopen() have
1725 a problem, which was not recognized till rather late (February 2006). With this
1726 umask, such files will be world writeable. (They are all content scanning files
1727 in the spool directory, which isn't world-accessible, so this is not a
1728 disaster, but it's untidy.) I don't want to change this overall setting,
1729 however, because it will interact badly with the open() calls. Instead, there's
1730 now a function called modefopen() that fiddles with the umask while calling
1735 /* Precompile the regular expression for matching a message id. Keep this in
1736 step with the code that generates ids in the accept.c module. We need to do
1737 this here, because the -M options check their arguments for syntactic validity
1738 using mac_ismsgid, which uses this. */
1741 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1743 /* Precompile the regular expression that is used for matching an SMTP error
1744 code, possibly extended, at the start of an error message. Note that the
1745 terminating whitespace character is included. */
1748 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1751 #ifdef WHITELIST_D_MACROS
1752 /* Precompile the regular expression used to filter the content of macros
1753 given to -D for permissibility. */
1755 regex_whitelisted_macro =
1756 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1759 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1761 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1762 this seems to be a generally accepted convention, since one finds symbolic
1763 links called "mailq" in standard OS configurations. */
1765 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1766 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1769 receiving_message = FALSE;
1770 called_as = US"-mailq";
1773 /* If the program is called as "rmail" treat it as equivalent to
1774 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1775 i.e. preventing a single dot on a line from terminating the message, and
1776 returning with zero return code, even in cases of error (provided an error
1777 message has been sent). */
1779 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1780 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1783 called_as = US"-rmail";
1784 errors_sender_rc = EXIT_SUCCESS;
1787 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1788 this is a smail convention. */
1790 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1791 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1793 smtp_input = smtp_batched_input = TRUE;
1794 called_as = US"-rsmtp";
1797 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1798 this is a smail convention. */
1800 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1801 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1804 receiving_message = FALSE;
1805 called_as = US"-runq";
1808 /* If the program is called as "newaliases" treat it as equivalent to
1809 "exim -bi"; this is a sendmail convention. */
1811 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1812 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1815 receiving_message = FALSE;
1816 called_as = US"-newaliases";
1819 /* Save the original effective uid for a couple of uses later. It should
1820 normally be root, but in some esoteric environments it may not be. */
1822 original_euid = geteuid();
1824 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1825 to be the same as the real ones. This makes a difference only if Exim is setuid
1826 (or setgid) to something other than root, which could be the case in some
1827 special configurations. */
1829 real_uid = getuid();
1830 real_gid = getgid();
1832 if (real_uid == root_uid)
1834 rv = setgid(real_gid);
1837 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1838 (long int)real_gid, strerror(errno));
1841 rv = setuid(real_uid);
1844 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1845 (long int)real_uid, strerror(errno));
1850 /* If neither the original real uid nor the original euid was root, Exim is
1851 running in an unprivileged state. */
1853 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1855 /* Scan the program's arguments. Some can be dealt with right away; others are
1856 simply recorded for checking and handling afterwards. Do a high-level switch
1857 on the second character (the one after '-'), to save some effort. */
1859 for (i = 1; i < argc; i++)
1861 BOOL badarg = FALSE;
1862 uschar *arg = argv[i];
1866 /* An argument not starting with '-' is the start of a recipients list;
1867 break out of the options-scanning loop. */
1875 /* An option consistion of -- terminates the options */
1877 if (Ustrcmp(arg, "--") == 0)
1879 recipients_arg = i + 1;
1883 /* Handle flagged options */
1885 switchchar = arg[1];
1888 /* Make all -ex options synonymous with -oex arguments, since that
1889 is assumed by various callers. Also make -qR options synonymous with -R
1890 options, as that seems to be required as well. Allow for -qqR too, and
1891 the same for -S options. */
1893 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1894 Ustrncmp(arg+1, "qR", 2) == 0 ||
1895 Ustrncmp(arg+1, "qS", 2) == 0)
1897 switchchar = arg[2];
1900 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1902 switchchar = arg[3];
1904 queue_2stage = TRUE;
1907 /* Make -r synonymous with -f, since it is a documented alias */
1909 else if (arg[1] == 'r') switchchar = 'f';
1911 /* Make -ov synonymous with -v */
1913 else if (Ustrcmp(arg, "-ov") == 0)
1919 /* deal with --option_aliases */
1920 else if (switchchar == '-')
1922 if (Ustrcmp(argrest, "help") == 0)
1924 usage_wanted = TRUE;
1927 else if (Ustrcmp(argrest, "version") == 0)
1934 /* High-level switch on active initial letter */
1939 /* sendmail uses -Ac and -Am to control which .cf file is used;
1942 if (*argrest == '\0') { badarg = TRUE; break; }
1945 BOOL ignore = FALSE;
1950 if (*(argrest + 1) == '\0')
1954 if (!ignore) { badarg = TRUE; break; }
1958 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1959 so has no need of it. */
1962 if (*argrest == 0) i++; /* Skip over the type */
1967 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1969 /* -bd: Run in daemon mode, awaiting SMTP connections.
1970 -bdf: Ditto, but in the foreground.
1973 if (*argrest == 'd')
1975 daemon_listen = TRUE;
1976 if (*(++argrest) == 'f') background_daemon = FALSE;
1977 else if (*argrest != 0) { badarg = TRUE; break; }
1980 /* -be: Run in expansion test mode
1981 -bem: Ditto, but read a message from a file first
1984 else if (*argrest == 'e')
1986 expansion_test = checking = TRUE;
1987 if (argrest[1] == 'm')
1989 if (++i >= argc) { badarg = TRUE; break; }
1990 expansion_test_message = argv[i];
1993 if (argrest[1] != 0) { badarg = TRUE; break; }
1996 /* -bF: Run system filter test */
1998 else if (*argrest == 'F')
2000 filter_test |= checking = FTEST_SYSTEM;
2001 if (*(++argrest) != 0) { badarg = TRUE; break; }
2002 if (++i < argc) filter_test_sfile = argv[i]; else
2004 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2009 /* -bf: Run user filter test
2010 -bfd: Set domain for filter testing
2011 -bfl: Set local part for filter testing
2012 -bfp: Set prefix for filter testing
2013 -bfs: Set suffix for filter testing
2016 else if (*argrest == 'f')
2018 if (*(++argrest) == 0)
2020 filter_test |= checking = FTEST_USER;
2021 if (++i < argc) filter_test_ufile = argv[i]; else
2023 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2031 fprintf(stderr, "exim: string expected after %s\n", arg);
2034 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2035 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2036 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2037 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2038 else { badarg = TRUE; break; }
2042 /* -bh: Host checking - an IP address must follow. */
2044 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2046 if (++i >= argc) { badarg = TRUE; break; }
2047 sender_host_address = argv[i];
2048 host_checking = checking = log_testing_mode = TRUE;
2049 host_checking_callout = argrest[1] == 'c';
2052 /* -bi: This option is used by sendmail to initialize *the* alias file,
2053 though it has the -oA option to specify a different file. Exim has no
2054 concept of *the* alias file, but since Sun's YP make script calls
2055 sendmail this way, some support must be provided. */
2057 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2059 /* -bI: provide information, of the type to follow after a colon.
2060 This is an Exim flag. */
2062 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2064 uschar *p = &argrest[2];
2065 info_flag = CMDINFO_HELP;
2068 if (strcmpic(p, CUS"sieve") == 0)
2070 info_flag = CMDINFO_SIEVE;
2073 else if (strcmpic(p, CUS"dscp") == 0)
2075 info_flag = CMDINFO_DSCP;
2078 else if (strcmpic(p, CUS"help") == 0)
2085 /* -bm: Accept and deliver message - the default option. Reinstate
2086 receiving_message, which got turned off for all -b options. */
2088 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2090 /* -bmalware: test the filename given for malware */
2092 else if (Ustrcmp(argrest, "malware") == 0)
2094 if (++i >= argc) { badarg = TRUE; break; }
2096 malware_test_file = argv[i];
2099 /* -bnq: For locally originating messages, do not qualify unqualified
2100 addresses. In the envelope, this causes errors; in header lines they
2103 else if (Ustrcmp(argrest, "nq") == 0)
2105 allow_unqualified_sender = FALSE;
2106 allow_unqualified_recipient = FALSE;
2109 /* -bpxx: List the contents of the mail queue, in various forms. If
2110 the option is -bpc, just a queue count is needed. Otherwise, if the
2111 first letter after p is r, then order is random. */
2113 else if (*argrest == 'p')
2115 if (*(++argrest) == 'c')
2118 if (*(++argrest) != 0) badarg = TRUE;
2122 if (*argrest == 'r')
2124 list_queue_option = 8;
2127 else list_queue_option = 0;
2131 /* -bp: List the contents of the mail queue, top-level only */
2133 if (*argrest == 0) {}
2135 /* -bpu: List the contents of the mail queue, top-level undelivered */
2137 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2139 /* -bpa: List the contents of the mail queue, including all delivered */
2141 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2143 /* Unknown after -bp[r] */
2153 /* -bP: List the configuration variables given as the address list.
2154 Force -v, so configuration errors get displayed. */
2156 else if (Ustrcmp(argrest, "P") == 0)
2158 /* -bP config: we need to setup here, because later,
2159 * when list_options is checked, the config is read already */
2160 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2163 readconf_save_config(version_string);
2167 list_options = TRUE;
2168 debug_selector |= D_v;
2169 debug_file = stderr;
2173 /* -brt: Test retry configuration lookup */
2175 else if (Ustrcmp(argrest, "rt") == 0)
2178 test_retry_arg = i + 1;
2182 /* -brw: Test rewrite configuration */
2184 else if (Ustrcmp(argrest, "rw") == 0)
2187 test_rewrite_arg = i + 1;
2191 /* -bS: Read SMTP commands on standard input, but produce no replies -
2192 all errors are reported by sending messages. */
2194 else if (Ustrcmp(argrest, "S") == 0)
2195 smtp_input = smtp_batched_input = receiving_message = TRUE;
2197 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2198 on standard output. */
2200 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2202 /* -bt: address testing mode */
2204 else if (Ustrcmp(argrest, "t") == 0)
2205 address_test_mode = checking = log_testing_mode = TRUE;
2207 /* -bv: verify addresses */
2209 else if (Ustrcmp(argrest, "v") == 0)
2210 verify_address_mode = checking = log_testing_mode = TRUE;
2212 /* -bvs: verify sender addresses */
2214 else if (Ustrcmp(argrest, "vs") == 0)
2216 verify_address_mode = checking = log_testing_mode = TRUE;
2217 verify_as_sender = TRUE;
2220 /* -bV: Print version string and support details */
2222 else if (Ustrcmp(argrest, "V") == 0)
2224 printf("Exim version %s #%s built %s\n", version_string,
2225 version_cnumber, version_date);
2226 printf("%s\n", CS version_copyright);
2227 version_printed = TRUE;
2228 show_whats_supported(stdout);
2229 log_testing_mode = TRUE;
2232 /* -bw: inetd wait mode, accept a listening socket as stdin */
2234 else if (*argrest == 'w')
2236 inetd_wait_mode = TRUE;
2237 background_daemon = FALSE;
2238 daemon_listen = TRUE;
2239 if (*(++argrest) != '\0')
2241 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2242 if (inetd_wait_timeout <= 0)
2244 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2254 /* -C: change configuration file list; ignore if it isn't really
2255 a change! Enforce a prefix check if required. */
2260 if(++i < argc) argrest = argv[i]; else
2261 { badarg = TRUE; break; }
2263 if (Ustrcmp(config_main_filelist, argrest) != 0)
2265 #ifdef ALT_CONFIG_PREFIX
2267 int len = Ustrlen(ALT_CONFIG_PREFIX);
2268 uschar *list = argrest;
2270 while((filename = string_nextinlist(&list, &sep, big_buffer,
2271 big_buffer_size)) != NULL)
2273 if ((Ustrlen(filename) < len ||
2274 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2275 Ustrstr(filename, "/../") != NULL) &&
2276 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2278 fprintf(stderr, "-C Permission denied\n");
2283 if (real_uid != root_uid)
2285 #ifdef TRUSTED_CONFIG_LIST
2287 if (real_uid != exim_uid
2288 #ifdef CONFIGURE_OWNER
2289 && real_uid != config_uid
2292 trusted_config = FALSE;
2295 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2298 struct stat statbuf;
2300 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2301 (statbuf.st_uid != root_uid /* owner not root */
2302 #ifdef CONFIGURE_OWNER
2303 && statbuf.st_uid != config_uid /* owner not the special one */
2306 (statbuf.st_gid != root_gid /* group not root */
2307 #ifdef CONFIGURE_GROUP
2308 && statbuf.st_gid != config_gid /* group not the special one */
2310 && (statbuf.st_mode & 020) != 0 /* group writeable */
2312 (statbuf.st_mode & 2) != 0) /* world writeable */
2314 trusted_config = FALSE;
2319 /* Well, the trust list at least is up to scratch... */
2320 void *reset_point = store_get(0);
2321 uschar *trusted_configs[32];
2325 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2327 uschar *start = big_buffer, *nl;
2328 while (*start && isspace(*start))
2332 nl = Ustrchr(start, '\n');
2335 trusted_configs[nr_configs++] = string_copy(start);
2336 if (nr_configs == 32)
2344 const uschar *list = argrest;
2346 while (trusted_config && (filename = string_nextinlist(&list,
2347 &sep, big_buffer, big_buffer_size)) != NULL)
2349 for (i=0; i < nr_configs; i++)
2351 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2354 if (i == nr_configs)
2356 trusted_config = FALSE;
2360 store_reset(reset_point);
2364 /* No valid prefixes found in trust_list file. */
2365 trusted_config = FALSE;
2371 /* Could not open trust_list file. */
2372 trusted_config = FALSE;
2376 /* Not root; don't trust config */
2377 trusted_config = FALSE;
2381 config_main_filelist = argrest;
2382 config_changed = TRUE;
2387 /* -D: set up a macro definition */
2390 #ifdef DISABLE_D_OPTION
2391 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2396 macro_item *mlast = NULL;
2399 uschar *s = argrest;
2401 while (isspace(*s)) s++;
2403 if (*s < 'A' || *s > 'Z')
2405 fprintf(stderr, "exim: macro name set by -D must start with "
2406 "an upper case letter\n");
2410 while (isalnum(*s) || *s == '_')
2412 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2416 if (ptr == 0) { badarg = TRUE; break; }
2417 while (isspace(*s)) s++;
2420 if (*s++ != '=') { badarg = TRUE; break; }
2421 while (isspace(*s)) s++;
2424 for (m = macros; m != NULL; m = m->next)
2426 if (Ustrcmp(m->name, name) == 0)
2428 fprintf(stderr, "exim: duplicated -D in command line\n");
2434 m = store_get(sizeof(macro_item) + Ustrlen(name));
2436 m->command_line = TRUE;
2437 if (mlast == NULL) macros = m; else mlast->next = m;
2438 Ustrcpy(m->name, name);
2439 m->replacement = string_copy(s);
2441 if (clmacro_count >= MAX_CLMACROS)
2443 fprintf(stderr, "exim: too many -D options on command line\n");
2446 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2452 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2453 The latter is now a no-op, retained for compatibility only. If -dd is used,
2454 debugging subprocesses of the daemon is disabled. */
2457 if (Ustrcmp(argrest, "ropcr") == 0)
2459 /* drop_cr = TRUE; */
2462 /* Use an intermediate variable so that we don't set debugging while
2463 decoding the debugging bits. */
2467 unsigned int selector = D_default;
2470 if (*argrest == 'd')
2472 debug_daemon = TRUE;
2476 decode_bits(&selector, 1, debug_notall, argrest,
2477 debug_options, debug_options_count, US"debug", 0);
2478 debug_selector = selector;
2483 /* -E: This is a local error message. This option is not intended for
2484 external use at all, but is not restricted to trusted callers because it
2485 does no harm (just suppresses certain error messages) and if Exim is run
2486 not setuid root it won't always be trusted when it generates error
2487 messages using this option. If there is a message id following -E, point
2488 message_reference at it, for logging. */
2491 local_error_message = TRUE;
2492 if (mac_ismsgid(argrest)) message_reference = argrest;
2496 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2497 option, so it looks as if historically the -oex options are also callable
2498 without the leading -o. So we have to accept them. Before the switch,
2499 anything starting -oe has been converted to -e. Exim does not support all
2500 of the sendmail error options. */
2503 if (Ustrcmp(argrest, "e") == 0)
2505 arg_error_handling = ERRORS_SENDER;
2506 errors_sender_rc = EXIT_SUCCESS;
2508 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2509 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2510 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2511 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2516 /* -F: Set sender's full name, used instead of the gecos entry from
2517 the password file. Since users can usually alter their gecos entries,
2518 there's no security involved in using this instead. The data can follow
2519 the -F or be in the next argument. */
2524 if(++i < argc) argrest = argv[i]; else
2525 { badarg = TRUE; break; }
2527 originator_name = argrest;
2528 sender_name_forced = TRUE;
2532 /* -f: Set sender's address - this value is only actually used if Exim is
2533 run by a trusted user, or if untrusted_set_sender is set and matches the
2534 address, except that the null address can always be set by any user. The
2535 test for this happens later, when the value given here is ignored when not
2536 permitted. For an untrusted user, the actual sender is still put in Sender:
2537 if it doesn't match the From: header (unless no_local_from_check is set).
2538 The data can follow the -f or be in the next argument. The -r switch is an
2539 obsolete form of -f but since there appear to be programs out there that
2540 use anything that sendmail has ever supported, better accept it - the
2541 synonymizing is done before the switch above.
2543 At this stage, we must allow domain literal addresses, because we don't
2544 know what the setting of allow_domain_literals is yet. Ditto for trailing
2545 dots and strip_trailing_dot. */
2549 int dummy_start, dummy_end;
2553 if (i+1 < argc) argrest = argv[++i]; else
2554 { badarg = TRUE; break; }
2557 sender_address = string_sprintf(""); /* Ensure writeable memory */
2560 uschar *temp = argrest + Ustrlen(argrest) - 1;
2561 while (temp >= argrest && isspace(*temp)) temp--;
2562 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2563 allow_domain_literals = TRUE;
2564 strip_trailing_dot = TRUE;
2566 allow_utf8_domains = TRUE;
2568 sender_address = parse_extract_address(argrest, &errmess,
2569 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2571 message_smtputf8 = string_is_utf8(sender_address);
2572 allow_utf8_domains = FALSE;
2574 allow_domain_literals = FALSE;
2575 strip_trailing_dot = FALSE;
2576 if (sender_address == NULL)
2578 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2579 return EXIT_FAILURE;
2582 sender_address_forced = TRUE;
2586 /* -G: sendmail invocation to specify that it's a gateway submission and
2587 sendmail may complain about problems instead of fixing them.
2588 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2589 not at this time complain about problems. */
2595 /* -h: Set the hop count for an incoming message. Exim does not currently
2596 support this; it always computes it by counting the Received: headers.
2597 To put it in will require a change to the spool header file format. */
2602 if(++i < argc) argrest = argv[i]; else
2603 { badarg = TRUE; break; }
2605 if (!isdigit(*argrest)) badarg = TRUE;
2609 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2610 not to be documented for sendmail but mailx (at least) uses it) */
2613 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2617 /* -L: set the identifier used for syslog; equivalent to setting
2618 syslog_processname in the config file, but needs to be an admin option. */
2621 if (*argrest == '\0')
2623 if(++i < argc) argrest = argv[i]; else
2624 { badarg = TRUE; break; }
2626 sz = Ustrlen(argrest);
2629 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2630 return EXIT_FAILURE;
2634 fprintf(stderr, "exim: the -L syslog name is too short\n");
2635 return EXIT_FAILURE;
2637 cmdline_syslog_name = argrest;
2641 receiving_message = FALSE;
2643 /* -MC: continue delivery of another message via an existing open
2644 file descriptor. This option is used for an internal call by the
2645 smtp transport when there is a pending message waiting to go to an
2646 address to which it has got a connection. Five subsequent arguments are
2647 required: transport name, host name, IP address, sequence number, and
2648 message_id. Transports may decline to create new processes if the sequence
2649 number gets too big. The channel is stdin. This (-MC) must be the last
2650 argument. There's a subsequent check that the real-uid is privileged.
2652 If we are running in the test harness. delay for a bit, to let the process
2653 that set this one up complete. This makes for repeatability of the logging,
2656 if (Ustrcmp(argrest, "C") == 0)
2658 union sockaddr_46 interface_sock;
2659 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2663 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2664 return EXIT_FAILURE;
2667 if (msg_action_arg >= 0)
2669 fprintf(stderr, "exim: incompatible arguments\n");
2670 return EXIT_FAILURE;
2673 continue_transport = argv[++i];
2674 continue_hostname = argv[++i];
2675 continue_host_address = argv[++i];
2676 continue_sequence = Uatoi(argv[++i]);
2677 msg_action = MSG_DELIVER;
2678 msg_action_arg = ++i;
2679 forced_delivery = TRUE;
2680 queue_run_pid = passed_qr_pid;
2681 queue_run_pipe = passed_qr_pipe;
2683 if (!mac_ismsgid(argv[i]))
2685 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2687 return EXIT_FAILURE;
2690 /* Set up $sending_ip_address and $sending_port */
2692 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2694 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2698 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2700 return EXIT_FAILURE;
2703 if (running_in_test_harness) millisleep(500);
2707 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2708 precedes -MC (see above). The flag indicates that the host to which
2709 Exim is connected has accepted an AUTH sequence. */
2711 else if (Ustrcmp(argrest, "CA") == 0)
2713 smtp_authenticated = TRUE;
2717 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2718 that exim is connected to supports the esmtp extension DSN */
2719 else if (Ustrcmp(argrest, "CD") == 0)
2721 smtp_use_dsn = TRUE;
2725 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2726 it preceded -MC (see above) */
2728 else if (Ustrcmp(argrest, "CP") == 0)
2730 smtp_use_pipelining = TRUE;
2734 /* -MCQ: pass on the pid of the queue-running process that started
2735 this chain of deliveries and the fd of its synchronizing pipe; this
2736 is useful only when it precedes -MC (see above) */
2738 else if (Ustrcmp(argrest, "CQ") == 0)
2740 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2742 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2747 /* -MCS: set the smtp_use_size flag; this is useful only when it
2748 precedes -MC (see above) */
2750 else if (Ustrcmp(argrest, "CS") == 0)
2752 smtp_use_size = TRUE;
2756 /* -MCT: set the tls_offered flag; this is useful only when it
2757 precedes -MC (see above). The flag indicates that the host to which
2758 Exim is connected has offered TLS support. */
2761 else if (Ustrcmp(argrest, "CT") == 0)
2768 /* -M[x]: various operations on the following list of message ids:
2769 -M deliver the messages, ignoring next retry times and thawing
2770 -Mc deliver the messages, checking next retry times, no thawing
2771 -Mf freeze the messages
2772 -Mg give up on the messages
2773 -Mt thaw the messages
2774 -Mrm remove the messages
2775 In the above cases, this must be the last option. There are also the
2776 following options which are followed by a single message id, and which
2777 act on that message. Some of them use the "recipient" addresses as well.
2778 -Mar add recipient(s)
2779 -Mmad mark all recipients delivered
2780 -Mmd mark recipients(s) delivered
2782 -Mset load a message for use with -be
2784 -Mvc show copy (of whole message, in RFC 2822 format)
2789 else if (*argrest == 0)
2791 msg_action = MSG_DELIVER;
2792 forced_delivery = deliver_force_thaw = TRUE;
2794 else if (Ustrcmp(argrest, "ar") == 0)
2796 msg_action = MSG_ADD_RECIPIENT;
2797 one_msg_action = TRUE;
2799 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2800 else if (Ustrcmp(argrest, "es") == 0)
2802 msg_action = MSG_EDIT_SENDER;
2803 one_msg_action = TRUE;
2805 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2806 else if (Ustrcmp(argrest, "g") == 0)
2808 msg_action = MSG_DELIVER;
2809 deliver_give_up = TRUE;
2811 else if (Ustrcmp(argrest, "mad") == 0)
2813 msg_action = MSG_MARK_ALL_DELIVERED;
2815 else if (Ustrcmp(argrest, "md") == 0)
2817 msg_action = MSG_MARK_DELIVERED;
2818 one_msg_action = TRUE;
2820 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2821 else if (Ustrcmp(argrest, "set") == 0)
2823 msg_action = MSG_LOAD;
2824 one_msg_action = TRUE;
2826 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2827 else if (Ustrcmp(argrest, "vb") == 0)
2829 msg_action = MSG_SHOW_BODY;
2830 one_msg_action = TRUE;
2832 else if (Ustrcmp(argrest, "vc") == 0)
2834 msg_action = MSG_SHOW_COPY;
2835 one_msg_action = TRUE;
2837 else if (Ustrcmp(argrest, "vh") == 0)
2839 msg_action = MSG_SHOW_HEADER;
2840 one_msg_action = TRUE;
2842 else if (Ustrcmp(argrest, "vl") == 0)
2844 msg_action = MSG_SHOW_LOG;
2845 one_msg_action = TRUE;
2847 else { badarg = TRUE; break; }
2849 /* All the -Mxx options require at least one message id. */
2851 msg_action_arg = i + 1;
2852 if (msg_action_arg >= argc)
2854 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2855 return EXIT_FAILURE;
2858 /* Some require only message ids to follow */
2860 if (!one_msg_action)
2863 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2865 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2867 return EXIT_FAILURE;
2869 goto END_ARG; /* Remaining args are ids */
2872 /* Others require only one message id, possibly followed by addresses,
2873 which will be handled as normal arguments. */
2877 if (!mac_ismsgid(argv[msg_action_arg]))
2879 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2880 argv[msg_action_arg], arg);
2881 return EXIT_FAILURE;
2888 /* Some programs seem to call the -om option without the leading o;
2889 for sendmail it askes for "me too". Exim always does this. */
2892 if (*argrest != 0) badarg = TRUE;
2896 /* -N: don't do delivery - a debugging option that stops transports doing
2897 their thing. It implies debugging at the D_v level. */
2902 dont_deliver = TRUE;
2903 debug_selector |= D_v;
2904 debug_file = stderr;
2910 /* -n: This means "don't alias" in sendmail, apparently.
2911 For normal invocations, it has no effect.
2912 It may affect some other options. */
2918 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2919 option to the specified value. This form uses long names. We need to handle
2920 -O option=value and -Ooption=value. */
2927 fprintf(stderr, "exim: string expected after -O\n");
2935 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2938 if (*argrest == 'A')
2940 alias_arg = argrest + 1;
2941 if (alias_arg[0] == 0)
2943 if (i+1 < argc) alias_arg = argv[++i]; else
2945 fprintf(stderr, "exim: string expected after -oA\n");
2951 /* -oB: Set a connection message max value for remote deliveries */
2953 else if (*argrest == 'B')
2955 uschar *p = argrest + 1;
2958 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2960 connection_max_messages = 1;
2969 fprintf(stderr, "exim: number expected after -oB\n");
2972 connection_max_messages = Uatoi(p);
2976 /* -odb: background delivery */
2978 else if (Ustrcmp(argrest, "db") == 0)
2980 synchronous_delivery = FALSE;
2981 arg_queue_only = FALSE;
2982 queue_only_set = TRUE;
2985 /* -odf: foreground delivery (smail-compatible option); same effect as
2986 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2989 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2991 synchronous_delivery = TRUE;
2992 arg_queue_only = FALSE;
2993 queue_only_set = TRUE;
2996 /* -odq: queue only */
2998 else if (Ustrcmp(argrest, "dq") == 0)
3000 synchronous_delivery = FALSE;
3001 arg_queue_only = TRUE;
3002 queue_only_set = TRUE;
3005 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3006 but no remote delivery */
3008 else if (Ustrcmp(argrest, "dqs") == 0)
3011 arg_queue_only = FALSE;
3012 queue_only_set = TRUE;
3015 /* -oex: Sendmail error flags. As these are also accepted without the
3016 leading -o prefix, for compatibility with vacation and other callers,
3017 they are handled with -e above. */
3019 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3020 -oitrue: Another sendmail syntax for the same */
3022 else if (Ustrcmp(argrest, "i") == 0 ||
3023 Ustrcmp(argrest, "itrue") == 0)
3026 /* -oM*: Set various characteristics for an incoming message; actually
3027 acted on for trusted callers only. */
3029 else if (*argrest == 'M')
3033 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3037 /* -oMa: Set sender host address */
3039 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3041 /* -oMaa: Set authenticator name */
3043 else if (Ustrcmp(argrest, "Maa") == 0)
3044 sender_host_authenticated = argv[++i];
3046 /* -oMas: setting authenticated sender */
3048 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3050 /* -oMai: setting authenticated id */
3052 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3054 /* -oMi: Set incoming interface address */
3056 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3058 /* -oMm: Message reference */
3060 else if (Ustrcmp(argrest, "Mm") == 0)
3062 if (!mac_ismsgid(argv[i+1]))
3064 fprintf(stderr,"-oMm must be a valid message ID\n");
3067 if (!trusted_config)
3069 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3072 message_reference = argv[++i];
3075 /* -oMr: Received protocol */
3077 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3079 /* -oMs: Set sender host name */
3081 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3083 /* -oMt: Set sender ident */
3085 else if (Ustrcmp(argrest, "Mt") == 0)
3087 sender_ident_set = TRUE;
3088 sender_ident = argv[++i];
3091 /* Else a bad argument */
3100 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3101 seem to call this as -m (undocumented), so that is also accepted (see
3104 else if (Ustrcmp(argrest, "m") == 0) {}
3106 /* -oo: An ancient flag for old-style addresses which still seems to
3107 crop up in some calls (see in SCO). */
3109 else if (Ustrcmp(argrest, "o") == 0) {}
3111 /* -oP <name>: set pid file path for daemon */
3113 else if (Ustrcmp(argrest, "P") == 0)
3114 override_pid_file_path = argv[++i];
3116 /* -or <n>: set timeout for non-SMTP acceptance
3117 -os <n>: set timeout for SMTP acceptance */
3119 else if (*argrest == 'r' || *argrest == 's')
3121 int *tp = (*argrest == 'r')?
3122 &arg_receive_timeout : &arg_smtp_receive_timeout;
3123 if (argrest[1] == 0)
3125 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3127 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3130 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3135 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3137 else if (Ustrcmp(argrest, "X") == 0)
3138 override_local_interfaces = argv[++i];
3140 /* Unknown -o argument */
3146 /* -ps: force Perl startup; -pd force delayed Perl startup */
3150 if (*argrest == 's' && argrest[1] == 0)
3152 perl_start_option = 1;
3155 if (*argrest == 'd' && argrest[1] == 0)
3157 perl_start_option = -1;
3162 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3163 which sets the host protocol and host name */
3167 if (i+1 < argc) argrest = argv[++i]; else
3168 { badarg = TRUE; break; }
3173 uschar *hn = Ustrchr(argrest, ':');
3176 received_protocol = argrest;
3180 received_protocol = string_copyn(argrest, hn - argrest);
3181 sender_host_name = hn + 1;
3188 receiving_message = FALSE;
3189 if (queue_interval >= 0)
3191 fprintf(stderr, "exim: -q specified more than once\n");
3195 /* -qq...: Do queue runs in a 2-stage manner */
3197 if (*argrest == 'q')
3199 queue_2stage = TRUE;
3203 /* -qi...: Do only first (initial) deliveries */
3205 if (*argrest == 'i')
3207 queue_run_first_delivery = TRUE;
3211 /* -qf...: Run the queue, forcing deliveries
3212 -qff..: Ditto, forcing thawing as well */
3214 if (*argrest == 'f')
3216 queue_run_force = TRUE;
3217 if (*(++argrest) == 'f')
3219 deliver_force_thaw = TRUE;
3224 /* -q[f][f]l...: Run the queue only on local deliveries */
3226 if (*argrest == 'l')
3228 queue_run_local = TRUE;
3232 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3233 optionally starting from a given message id. */
3235 if (*argrest == 0 &&
3236 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3239 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3240 start_queue_run_id = argv[++i];
3241 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3242 stop_queue_run_id = argv[++i];
3245 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3246 optionally local only. */
3251 queue_interval = readconf_readtime(argrest, 0, FALSE);
3253 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3254 if (queue_interval <= 0)
3256 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3263 case 'R': /* Synonymous with -qR... */
3264 receiving_message = FALSE;
3266 /* -Rf: As -R (below) but force all deliveries,
3267 -Rff: Ditto, but also thaw all frozen messages,
3268 -Rr: String is regex
3269 -Rrf: Regex and force
3270 -Rrff: Regex and force and thaw
3272 in all cases provided there are no further characters in this
3278 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3280 if (Ustrcmp(argrest, rsopts[i]) == 0)
3282 if (i != 2) queue_run_force = TRUE;
3283 if (i >= 2) deliver_selectstring_regex = TRUE;
3284 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3285 argrest += Ustrlen(rsopts[i]);
3290 /* -R: Set string to match in addresses for forced queue run to
3291 pick out particular messages. */
3295 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3297 fprintf(stderr, "exim: string expected after -R\n");
3301 else deliver_selectstring = argrest;
3305 /* -r: an obsolete synonym for -f (see above) */
3308 /* -S: Like -R but works on sender. */
3310 case 'S': /* Synonymous with -qS... */
3311 receiving_message = FALSE;
3313 /* -Sf: As -S (below) but force all deliveries,
3314 -Sff: Ditto, but also thaw all frozen messages,
3315 -Sr: String is regex
3316 -Srf: Regex and force
3317 -Srff: Regex and force and thaw
3319 in all cases provided there are no further characters in this
3325 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3327 if (Ustrcmp(argrest, rsopts[i]) == 0)
3329 if (i != 2) queue_run_force = TRUE;
3330 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3331 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3332 argrest += Ustrlen(rsopts[i]);
3337 /* -S: Set string to match in addresses for forced queue run to
3338 pick out particular messages. */
3342 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3344 fprintf(stderr, "exim: string expected after -S\n");
3348 else deliver_selectstring_sender = argrest;
3351 /* -Tqt is an option that is exclusively for use by the testing suite.
3352 It is not recognized in other circumstances. It allows for the setting up
3353 of explicit "queue times" so that various warning/retry things can be
3354 tested. Otherwise variability of clock ticks etc. cause problems. */
3357 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3358 fudged_queue_times = argv[++i];
3363 /* -t: Set flag to extract recipients from body of message. */
3366 if (*argrest == 0) extract_recipients = TRUE;
3368 /* -ti: Set flag to extract recipients from body of message, and also
3369 specify that dot does not end the message. */
3371 else if (Ustrcmp(argrest, "i") == 0)
3373 extract_recipients = TRUE;
3377 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3380 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3387 /* -U: This means "initial user submission" in sendmail, apparently. The
3388 doc claims that in future sendmail may refuse syntactically invalid
3389 messages instead of fixing them. For the moment, we just ignore it. */
3395 /* -v: verify things - this is a very low-level debugging */
3400 debug_selector |= D_v;
3401 debug_file = stderr;
3407 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3409 The -x flag tells the sendmail command that mail from a local
3410 mail program has National Language Support (NLS) extended characters
3411 in the body of the mail item. The sendmail command can send mail with
3412 extended NLS characters across networks that normally corrupts these
3415 As Exim is 8-bit clean, it just ignores this flag. */
3418 if (*argrest != 0) badarg = TRUE;
3421 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3422 logs to that file. We swallow the parameter and otherwise ignore it. */
3425 if (*argrest == '\0')
3428 fprintf(stderr, "exim: string expected after -X\n");
3434 if (*argrest == '\0')
3435 if (++i < argc) log_oneline = argv[i]; else
3437 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3442 /* All other initial characters are errors */
3447 } /* End of high-level switch statement */
3449 /* Failed to recognize the option, or syntax error */
3453 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3454 "option %s\n", arg);
3460 /* If -R or -S have been specified without -q, assume a single queue run. */
3462 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3463 queue_interval < 0) queue_interval = 0;
3467 /* If usage_wanted is set we call the usage function - which never returns */
3468 if (usage_wanted) exim_usage(called_as);
3470 /* Arguments have been processed. Check for incompatibilities. */
3472 (smtp_input || extract_recipients || recipients_arg < argc) &&
3473 (daemon_listen || queue_interval >= 0 || bi_option ||
3474 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3475 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3478 msg_action_arg > 0 &&
3479 (daemon_listen || queue_interval >= 0 || list_options ||
3480 (checking && msg_action != MSG_LOAD) ||
3481 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3484 (daemon_listen || queue_interval >= 0) &&
3485 (sender_address != NULL || list_options || list_queue || checking ||
3489 daemon_listen && queue_interval == 0
3492 inetd_wait_mode && queue_interval >= 0
3496 (checking || smtp_input || extract_recipients ||
3497 filter_test != FTEST_NONE || bi_option)
3500 verify_address_mode &&
3501 (address_test_mode || smtp_input || extract_recipients ||
3502 filter_test != FTEST_NONE || bi_option)
3505 address_test_mode && (smtp_input || extract_recipients ||
3506 filter_test != FTEST_NONE || bi_option)
3509 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3513 deliver_selectstring != NULL && queue_interval < 0
3516 msg_action == MSG_LOAD &&
3517 (!expansion_test || expansion_test_message != NULL)
3521 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3525 /* If debugging is set up, set the file and the file descriptor to pass on to
3526 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3527 to run in the foreground. */
3529 if (debug_selector != 0)
3531 debug_file = stderr;
3532 debug_fd = fileno(debug_file);
3533 background_daemon = FALSE;
3534 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3535 if (debug_selector != D_v) /* -v only doesn't show this */
3537 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3538 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3540 if (!version_printed)
3541 show_whats_supported(stderr);
3545 /* When started with root privilege, ensure that the limits on the number of
3546 open files and the number of processes (where that is accessible) are
3547 sufficiently large, or are unset, in case Exim has been called from an
3548 environment where the limits are screwed down. Not all OS have the ability to
3549 change some of these limits. */
3553 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3559 #ifdef RLIMIT_NOFILE
3560 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3562 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3564 rlp.rlim_cur = rlp.rlim_max = 0;
3567 /* I originally chose 1000 as a nice big number that was unlikely to
3568 be exceeded. It turns out that some older OS have a fixed upper limit of
3571 if (rlp.rlim_cur < 1000)
3573 rlp.rlim_cur = rlp.rlim_max = 1000;
3574 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3576 rlp.rlim_cur = rlp.rlim_max = 256;
3577 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3578 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3585 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3587 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3589 rlp.rlim_cur = rlp.rlim_max = 0;
3592 #ifdef RLIM_INFINITY
3593 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3595 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3597 if (rlp.rlim_cur < 1000)
3599 rlp.rlim_cur = rlp.rlim_max = 1000;
3601 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3602 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3608 /* Exim is normally entered as root (but some special configurations are
3609 possible that don't do this). However, it always spins off sub-processes that
3610 set their uid and gid as required for local delivery. We don't want to pass on
3611 any extra groups that root may belong to, so we want to get rid of them all at
3614 We need to obey setgroups() at this stage, before possibly giving up root
3615 privilege for a changed configuration file, but later on we might need to
3616 check on the additional groups for the admin user privilege - can't do that
3617 till after reading the config, which might specify the exim gid. Therefore,
3618 save the group list here first. */
3620 group_count = getgroups(NGROUPS_MAX, group_list);
3621 if (group_count < 0)
3623 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3627 /* There is a fundamental difference in some BSD systems in the matter of
3628 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3629 known not to be different. On the "different" systems there is a single group
3630 list, and the first entry in it is the current group. On all other versions of
3631 Unix there is a supplementary group list, which is in *addition* to the current
3632 group. Consequently, to get rid of all extraneous groups on a "standard" system
3633 you pass over 0 groups to setgroups(), while on a "different" system you pass
3634 over a single group - the current group, which is always the first group in the
3635 list. Calling setgroups() with zero groups on a "different" system results in
3636 an error return. The following code should cope with both types of system.
3638 However, if this process isn't running as root, setgroups() can't be used
3639 since you have to be root to run it, even if throwing away groups. Not being
3640 root here happens only in some unusual configurations. We just ignore the
3643 if (setgroups(0, NULL) != 0)
3645 if (setgroups(1, group_list) != 0 && !unprivileged)
3647 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3652 /* If the configuration file name has been altered by an argument on the
3653 command line (either a new file name or a macro definition) and the caller is
3654 not root, or if this is a filter testing run, remove any setuid privilege the
3655 program has and run as the underlying user.
3657 The exim user is locked out of this, which severely restricts the use of -C
3660 Otherwise, set the real ids to the effective values (should be root unless run
3661 from inetd, which it can either be root or the exim uid, if one is configured).
3663 There is a private mechanism for bypassing some of this, in order to make it
3664 possible to test lots of configurations automatically, without having either to
3665 recompile each time, or to patch in an actual configuration file name and other
3666 values (such as the path name). If running in the test harness, pretend that
3667 configuration file changes and macro definitions haven't happened. */
3670 (!trusted_config || /* Config changed, or */
3671 !macros_trusted()) && /* impermissible macros and */
3672 real_uid != root_uid && /* Not root, and */
3673 !running_in_test_harness /* Not fudged */
3675 expansion_test /* expansion testing */
3677 filter_test != FTEST_NONE) /* Filter testing */
3679 setgroups(group_count, group_list);
3680 exim_setugid(real_uid, real_gid, FALSE,
3681 US"-C, -D, -be or -bf forces real uid");
3682 removed_privilege = TRUE;
3684 /* In the normal case when Exim is called like this, stderr is available
3685 and should be used for any logging information because attempts to write
3686 to the log will usually fail. To arrange this, we unset really_exim. However,
3687 if no stderr is available there is no point - we might as well have a go
3688 at the log (if it fails, syslog will be written).
3690 Note that if the invoker is Exim, the logs remain available. Messing with
3691 this causes unlogged successful deliveries. */
3693 if ((log_stderr != NULL) && (real_uid != exim_uid))
3694 really_exim = FALSE;
3697 /* Privilege is to be retained for the moment. It may be dropped later,
3698 depending on the job that this Exim process has been asked to do. For now, set
3699 the real uid to the effective so that subsequent re-execs of Exim are done by a
3702 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3704 /* If testing a filter, open the file(s) now, before wasting time doing other
3705 setups and reading the message. */
3707 if ((filter_test & FTEST_SYSTEM) != 0)
3709 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3712 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3714 return EXIT_FAILURE;
3718 if ((filter_test & FTEST_USER) != 0)
3720 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3723 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3725 return EXIT_FAILURE;
3729 /* Initialise lookup_list
3730 If debugging, already called above via version reporting.
3731 In either case, we initialise the list of available lookups while running
3732 as root. All dynamically modules are loaded from a directory which is
3733 hard-coded into the binary and is code which, if not a module, would be
3734 part of Exim already. Ability to modify the content of the directory
3735 is equivalent to the ability to modify a setuid binary!
3737 This needs to happen before we read the main configuration. */
3741 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3744 /* Read the main runtime configuration data; this gives up if there
3745 is a failure. It leaves the configuration file open so that the subsequent
3746 configuration data for delivery can be read if needed.
3748 NOTE: immediatly after opening the configuration file we change the working
3749 directory to "/"! Later we change to $spool_directory. We do it there, because
3750 during readconf_main() some expansion takes place already. */
3752 /* Store the initial cwd before we change directories */
3753 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3755 perror("exim: can't get the current working directory");
3760 -be[m] expansion test -
3761 -b[fF] filter test new
3763 -bmalware malware_test_file new
3765 -brw rewrite test new
3767 -bv[s] address verify -
3769 -bP <option> (except -bP config, which sets list_config)
3771 If any of these options is set, we suppress warnings about configuration
3772 issues (currently about tls_advertise_hosts and keep_environment not being
3775 readconf_main(checking || list_options);
3777 /* Now in directory "/" */
3779 if (cleanup_environment() == FALSE)
3780 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3783 /* If an action on specific messages is requested, or if a daemon or queue
3784 runner is being started, we need to know if Exim was called by an admin user.
3785 This is the case if the real user is root or exim, or if the real group is
3786 exim, or if one of the supplementary groups is exim or a group listed in
3787 admin_groups. We don't fail all message actions immediately if not admin_user,
3788 since some actions can be performed by non-admin users. Instead, set admin_user
3789 for later interrogation. */
3791 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3796 for (i = 0; i < group_count; i++)
3798 if (group_list[i] == exim_gid) admin_user = TRUE;
3799 else if (admin_groups != NULL)
3801 for (j = 1; j <= (int)(admin_groups[0]); j++)
3802 if (admin_groups[j] == group_list[i])
3803 { admin_user = TRUE; break; }
3805 if (admin_user) break;
3809 /* Another group of privileged users are the trusted users. These are root,
3810 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3811 are permitted to specify sender_addresses with -f on the command line, and
3812 other message parameters as well. */
3814 if (real_uid == root_uid || real_uid == exim_uid)
3815 trusted_caller = TRUE;
3820 if (trusted_users != NULL)
3822 for (i = 1; i <= (int)(trusted_users[0]); i++)
3823 if (trusted_users[i] == real_uid)
3824 { trusted_caller = TRUE; break; }
3827 if (!trusted_caller && trusted_groups != NULL)
3829 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3831 if (trusted_groups[i] == real_gid)
3832 trusted_caller = TRUE;
3833 else for (j = 0; j < group_count; j++)
3835 if (trusted_groups[i] == group_list[j])
3836 { trusted_caller = TRUE; break; }
3838 if (trusted_caller) break;
3843 /* Handle the decoding of logging options. */
3845 decode_bits(log_selector, log_selector_size, log_notall,
3846 log_selector_string, log_options, log_options_count, US"log", 0);
3851 debug_printf("configuration file is %s\n", config_main_filename);
3852 debug_printf("log selectors =");
3853 for (i = 0; i < log_selector_size; i++)
3854 debug_printf(" %08x", log_selector[i]);
3858 /* If domain literals are not allowed, check the sender address that was
3859 supplied with -f. Ditto for a stripped trailing dot. */
3861 if (sender_address != NULL)
3863 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3865 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3866 "allowed\n", sender_address);
3867 return EXIT_FAILURE;
3869 if (f_end_dot && !strip_trailing_dot)
3871 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3872 "(trailing dot not allowed)\n", sender_address);
3873 return EXIT_FAILURE;
3877 /* See if an admin user overrode our logging. */
3879 if (cmdline_syslog_name != NULL)
3883 syslog_processname = cmdline_syslog_name;
3884 log_file_path = string_copy(CUS"syslog");
3888 /* not a panic, non-privileged users should not be able to spam paniclog */
3890 "exim: you lack sufficient privilege to specify syslog process name\n");
3891 return EXIT_FAILURE;
3895 /* Paranoia check of maximum lengths of certain strings. There is a check
3896 on the length of the log file path in log.c, which will come into effect
3897 if there are any calls to write the log earlier than this. However, if we
3898 get this far but the string is very long, it is better to stop now than to
3899 carry on and (e.g.) receive a message and then have to collapse. The call to
3900 log_write() from here will cause the ultimate panic collapse if the complete
3901 file name exceeds the buffer length. */
3903 if (Ustrlen(log_file_path) > 200)
3904 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3905 "log_file_path is longer than 200 chars: aborting");
3907 if (Ustrlen(pid_file_path) > 200)
3908 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3909 "pid_file_path is longer than 200 chars: aborting");
3911 if (Ustrlen(spool_directory) > 200)
3912 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3913 "spool_directory is longer than 200 chars: aborting");
3915 /* Length check on the process name given to syslog for its TAG field,
3916 which is only permitted to be 32 characters or less. See RFC 3164. */
3918 if (Ustrlen(syslog_processname) > 32)
3919 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3920 "syslog_processname is longer than 32 chars: aborting");
3926 log_write(0, LOG_MAIN, "%s", log_oneline);
3927 return EXIT_SUCCESS;
3930 return EXIT_FAILURE;
3933 /* In some operating systems, the environment variable TMPDIR controls where
3934 temporary files are created; Exim doesn't use these (apart from when delivering
3935 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3936 If TMPDIR is found in the environment, reset it to the value defined in the
3937 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3938 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3939 EXIM_TMPDIR by the build scripts.
3945 if (environ) for (p = USS environ; *p != NULL; p++)
3947 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3948 Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3950 uschar *newp = malloc(Ustrlen(EXIM_TMPDIR) + 8);
3951 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3953 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3959 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3960 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3961 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3962 called by a user who has set the TZ variable. This then affects the timestamps
3963 in log files and in Received: headers, and any created Date: header lines. The
3964 required timezone is settable in the configuration file, so nothing can be done
3965 about this earlier - but hopefully nothing will normally be logged earlier than
3966 this. We have to make a new environment if TZ is wrong, but don't bother if
3967 timestamps_utc is set, because then all times are in UTC anyway. */
3969 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3971 timestamps_utc = TRUE;
3975 uschar *envtz = US getenv("TZ");
3976 if ((envtz == NULL && timezone_string != NULL) ||
3978 (timezone_string == NULL ||
3979 Ustrcmp(timezone_string, envtz) != 0)))
3981 uschar **p = USS environ;
3985 if (environ) while (*p++ != NULL) count++;
3986 if (envtz == NULL) count++;
3987 newp = new = malloc(sizeof(uschar *) * (count + 1));
3988 if (environ) for (p = USS environ; *p != NULL; p++)
3990 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3993 if (timezone_string != NULL)
3995 *newp = malloc(Ustrlen(timezone_string) + 4);
3996 sprintf(CS *newp++, "TZ=%s", timezone_string);
4001 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4002 tod_stamp(tod_log));
4006 /* Handle the case when we have removed the setuid privilege because of -C or
4007 -D. This means that the caller of Exim was not root.
4009 There is a problem if we were running as the Exim user. The sysadmin may
4010 expect this case to retain privilege because "the binary was called by the
4011 Exim user", but it hasn't, because either the -D option set macros, or the
4012 -C option set a non-trusted configuration file. There are two possibilities:
4014 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4015 to do message deliveries. Thus, the fact that it is running as a
4016 non-privileged user is plausible, and might be wanted in some special
4017 configurations. However, really_exim will have been set false when
4018 privilege was dropped, to stop Exim trying to write to its normal log
4019 files. Therefore, re-enable normal log processing, assuming the sysadmin
4020 has set up the log directory correctly.
4022 (2) If deliver_drop_privilege is not set, the configuration won't work as
4023 apparently intended, and so we log a panic message. In order to retain
4024 root for -C or -D, the caller must either be root or be invoking a
4025 trusted configuration file (when deliver_drop_privilege is false). */
4027 if (removed_privilege && (!trusted_config || macros != NULL) &&
4028 real_uid == exim_uid)
4030 if (deliver_drop_privilege)
4031 really_exim = TRUE; /* let logging work normally */
4033 log_write(0, LOG_MAIN|LOG_PANIC,
4034 "exim user lost privilege for using %s option",
4035 trusted_config? "-D" : "-C");
4038 /* Start up Perl interpreter if Perl support is configured and there is a
4039 perl_startup option, and the configuration or the command line specifies
4040 initializing starting. Note that the global variables are actually called
4041 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4044 if (perl_start_option != 0)
4045 opt_perl_at_start = (perl_start_option > 0);
4046 if (opt_perl_at_start && opt_perl_startup != NULL)
4049 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4050 errstr = init_perl(opt_perl_startup);
4053 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4054 return EXIT_FAILURE;
4056 opt_perl_started = TRUE;
4058 #endif /* EXIM_PERL */
4060 /* Log the arguments of the call if the configuration file said so. This is
4061 a debugging feature for finding out what arguments certain MUAs actually use.
4062 Don't attempt it if logging is disabled, or if listing variables or if
4063 verifying/testing addresses or expansions. */
4065 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4066 && really_exim && !list_options && !checking)
4069 uschar *p = big_buffer;
4070 Ustrcpy(p, "cwd= (failed)");
4072 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4075 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4077 for (i = 0; i < argc; i++)
4079 int len = Ustrlen(argv[i]);
4080 const uschar *printing;
4082 if (p + len + 8 >= big_buffer + big_buffer_size)
4085 log_write(0, LOG_MAIN, "%s", big_buffer);
4086 Ustrcpy(big_buffer, "...");
4089 printing = string_printing(argv[i]);
4090 if (printing[0] == 0) quote = US"\""; else
4092 const uschar *pp = printing;
4094 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4096 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4097 (p - big_buffer) - 4), printing, quote);
4101 if (LOGGING(arguments))
4102 log_write(0, LOG_MAIN, "%s", big_buffer);
4104 debug_printf("%s\n", big_buffer);
4107 /* Set the working directory to be the top-level spool directory. We don't rely
4108 on this in the code, which always uses fully qualified names, but it's useful
4109 for core dumps etc. Don't complain if it fails - the spool directory might not
4110 be generally accessible and calls with the -C option (and others) have lost
4111 privilege by now. Before the chdir, we try to ensure that the directory exists.
4114 if (Uchdir(spool_directory) != 0)
4117 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4118 dummy = /* quieten compiler */ Uchdir(spool_directory);
4121 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4122 alias file. Exim doesn't have such a concept, but this call is screwed into
4123 Sun's YP makefiles. Handle this by calling a configured script, as the real
4124 user who called Exim. The -oA option can be used to pass an argument to the
4129 (void)fclose(config_file);
4130 if (bi_command != NULL)
4134 argv[i++] = bi_command;
4135 if (alias_arg != NULL) argv[i++] = alias_arg;
4138 setgroups(group_count, group_list);
4139 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4141 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4142 (argv[1] == NULL)? US"" : argv[1]);
4144 execv(CS argv[0], (char *const *)argv);
4145 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4150 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4155 /* We moved the admin/trusted check to be immediately after reading the
4156 configuration file. We leave these prints here to ensure that syslog setup,
4157 logfile setup, and so on has already happened. */
4159 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4160 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4162 /* Only an admin user may start the daemon or force a queue run in the default
4163 configuration, but the queue run restriction can be relaxed. Only an admin
4164 user may request that a message be returned to its sender forthwith. Only an
4165 admin user may specify a debug level greater than D_v (because it might show
4166 passwords, etc. in lookup queries). Only an admin user may request a queue
4167 count. Only an admin user can use the test interface to scan for email
4168 (because Exim will be in the spool dir and able to look at mails). */
4172 BOOL debugset = (debug_selector & ~D_v) != 0;
4173 if (deliver_give_up || daemon_listen || malware_test_file ||
4174 (count_queue && queue_list_requires_admin) ||
4175 (list_queue && queue_list_requires_admin) ||
4176 (queue_interval >= 0 && prod_requires_admin) ||
4177 (debugset && !running_in_test_harness))
4179 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4184 /* If the real user is not root or the exim uid, the argument for passing
4185 in an open TCP/IP connection for another message is not permitted, nor is
4186 running with the -N option for any delivery action, unless this call to exim is
4187 one that supplied an input message, or we are using a patched exim for
4188 regression testing. */
4190 if (real_uid != root_uid && real_uid != exim_uid &&
4191 (continue_hostname != NULL ||
4193 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4194 )) && !running_in_test_harness)
4196 fprintf(stderr, "exim: Permission denied\n");
4197 return EXIT_FAILURE;
4200 /* If the caller is not trusted, certain arguments are ignored when running for
4201 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4202 Note that authority for performing certain actions on messages is tested in the
4203 queue_action() function. */
4205 if (!trusted_caller && !checking)
4207 sender_host_name = sender_host_address = interface_address =
4208 sender_ident = received_protocol = NULL;
4209 sender_host_port = interface_port = 0;
4210 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4213 /* If a sender host address is set, extract the optional port number off the
4214 end of it and check its syntax. Do the same thing for the interface address.
4215 Exim exits if the syntax is bad. */
4219 if (sender_host_address != NULL)
4220 sender_host_port = check_port(sender_host_address);
4221 if (interface_address != NULL)
4222 interface_port = check_port(interface_address);
4225 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4230 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4231 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4235 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4236 return EXIT_FAILURE;
4240 /* If an SMTP message is being received check to see if the standard input is a
4241 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4242 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4247 union sockaddr_46 inetd_sock;
4248 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4249 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4251 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4252 if (family == AF_INET || family == AF_INET6)
4254 union sockaddr_46 interface_sock;
4255 size = sizeof(interface_sock);
4257 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4258 interface_address = host_ntoa(-1, &interface_sock, NULL,
4261 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4263 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4266 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4267 NULL, &sender_host_port);
4268 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4269 "inetd is not supported when mua_wrapper is set");
4274 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4275 return EXIT_FAILURE;
4281 /* If the load average is going to be needed while receiving a message, get it
4282 now for those OS that require the first call to os_getloadavg() to be done as
4283 root. There will be further calls later for each message received. */
4285 #ifdef LOAD_AVG_NEEDS_ROOT
4286 if (receiving_message &&
4287 (queue_only_load >= 0 ||
4288 (is_inetd && smtp_load_reserve >= 0)
4291 load_average = OS_GETLOADAVG();
4295 /* The queue_only configuration option can be overridden by -odx on the command
4296 line, except that if queue_only_override is false, queue_only cannot be unset
4297 from the command line. */
4299 if (queue_only_set && (queue_only_override || arg_queue_only))
4300 queue_only = arg_queue_only;
4302 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4305 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4306 if (arg_smtp_receive_timeout >= 0)
4307 smtp_receive_timeout = arg_smtp_receive_timeout;
4309 /* If Exim was started with root privilege, unless we have already removed the
4310 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4311 except when starting the daemon or doing some kind of delivery or address
4312 testing (-bt). These are the only cases when root need to be retained. We run
4313 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4314 retained only for starting the daemon. We always do the initgroups() in this
4315 situation (controlled by the TRUE below), in order to be as close as possible
4316 to the state Exim usually runs in. */
4318 if (!unprivileged && /* originally had root AND */
4319 !removed_privilege && /* still got root AND */
4320 !daemon_listen && /* not starting the daemon */
4321 queue_interval <= 0 && /* (either kind of daemon) */
4323 deliver_drop_privilege || /* requested unprivileged */
4325 queue_interval < 0 && /* not running the queue */
4326 (msg_action_arg < 0 || /* and */
4327 msg_action != MSG_DELIVER) && /* not delivering and */
4328 (!checking || !address_test_mode) /* not address checking */
4332 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4335 /* When we are retaining a privileged uid, we still change to the exim gid. */
4340 rv = setgid(exim_gid);
4341 /* Impact of failure is that some stuff might end up with an incorrect group.
4342 We track this for failures from root, since any attempt to change privilege
4343 by root should succeed and failures should be examined. For non-root,
4344 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4345 no need to complain then. */
4348 if (!(unprivileged || removed_privilege))
4351 "exim: changing group failed: %s\n", strerror(errno));
4355 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4356 (long int)exim_gid, strerror(errno));
4360 /* Handle a request to scan a file for malware */
4361 if (malware_test_file)
4363 #ifdef WITH_CONTENT_SCAN
4365 set_process_info("scanning file for malware");
4366 result = malware_in_file(malware_test_file);
4369 printf("No malware found.\n");
4374 printf("Malware lookup returned non-okay/fail: %d\n", result);
4378 printf("Malware found: %s\n", malware_name);
4380 printf("Malware scan detected malware of unknown name.\n");
4382 printf("Malware scanning not enabled at compile time.\n");
4387 /* Handle a request to list the delivery queue */
4391 set_process_info("listing the queue");
4392 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4396 /* Handle a request to count the delivery queue */
4400 set_process_info("counting the queue");
4405 /* Handle actions on specific messages, except for the force delivery and
4406 message load actions, which are done below. Some actions take a whole list of
4407 message ids, which are known to continue up to the end of the arguments. Others
4408 take a single message id and then operate on the recipients list. */
4410 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4412 int yield = EXIT_SUCCESS;
4413 set_process_info("acting on specified messages");
4415 if (!one_msg_action)
4417 for (i = msg_action_arg; i < argc; i++)
4418 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4419 yield = EXIT_FAILURE;
4422 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4423 recipients_arg)) yield = EXIT_FAILURE;
4427 /* We used to set up here to skip reading the ACL section, on
4428 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4429 Now, since the intro of the ${acl } expansion, ACL definitions may be
4430 needed in transports so we lost the optimisation. */
4434 /* The configuration data will have been read into POOL_PERM because we won't
4435 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4436 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4437 configuration were read into POOL_MAIN, because we don't do any resets till
4438 later on. However, it seems right, and it does ensure that both pools get used.
4441 store_pool = POOL_MAIN;
4443 /* Handle the -brt option. This is for checking out retry configurations.
4444 The next three arguments are a domain name or a complete address, and
4445 optionally two error numbers. All it does is to call the function that
4446 scans the retry configuration data. */
4448 if (test_retry_arg >= 0)
4450 retry_config *yield;
4451 int basic_errno = 0;
4455 if (test_retry_arg >= argc)
4457 printf("-brt needs a domain or address argument\n");
4458 exim_exit(EXIT_FAILURE);
4460 s1 = argv[test_retry_arg++];
4463 /* If the first argument contains no @ and no . it might be a local user
4464 or it might be a single-component name. Treat as a domain. */
4466 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4468 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4469 "being \ntreated as a one-component domain, not as a local part.\n\n",
4473 /* There may be an optional second domain arg. */
4475 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4476 s2 = argv[test_retry_arg++];
4478 /* The final arg is an error name */
4480 if (test_retry_arg < argc)
4482 uschar *ss = argv[test_retry_arg];
4484 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4487 printf("%s\n", CS error);
4488 return EXIT_FAILURE;
4491 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4492 code > 100 as an error is for matching codes to the decade. Turn them into
4493 a real error code, off the decade. */
4495 if (basic_errno == ERRNO_MAIL4XX ||
4496 basic_errno == ERRNO_RCPT4XX ||
4497 basic_errno == ERRNO_DATA4XX)
4499 int code = (more_errno >> 8) & 255;
4501 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4502 else if (code > 100)
4503 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4507 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4508 if (yield == NULL) printf("No retry information found\n"); else
4511 more_errno = yield->more_errno;
4512 printf("Retry rule: %s ", yield->pattern);
4514 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4516 printf("quota%s%s ",
4517 (more_errno > 0)? "_" : "",
4518 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4520 else if (yield->basic_errno == ECONNREFUSED)
4522 printf("refused%s%s ",
4523 (more_errno > 0)? "_" : "",
4524 (more_errno == 'M')? "MX" :
4525 (more_errno == 'A')? "A" : "");
4527 else if (yield->basic_errno == ETIMEDOUT)
4530 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4532 if (more_errno != 0) printf("_%s",
4533 (more_errno == 'M')? "MX" : "A");
4536 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4537 printf("auth_failed ");
4540 for (r = yield->rules; r != NULL; r = r->next)
4542 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4543 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4549 printf(",%d.", x/1000);
4563 exim_exit(EXIT_SUCCESS);
4566 /* Handle a request to list one or more configuration options */
4567 /* If -n was set, we suppress some information */
4571 set_process_info("listing variables");
4572 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4573 else for (i = recipients_arg; i < argc; i++)
4576 (Ustrcmp(argv[i], "router") == 0 ||
4577 Ustrcmp(argv[i], "transport") == 0 ||
4578 Ustrcmp(argv[i], "authenticator") == 0 ||
4579 Ustrcmp(argv[i], "macro") == 0 ||
4580 Ustrcmp(argv[i], "environment") == 0))
4582 readconf_print(argv[i+1], argv[i], flag_n);
4585 else readconf_print(argv[i], NULL, flag_n);
4587 exim_exit(EXIT_SUCCESS);
4592 set_process_info("listing config");
4593 readconf_print(US"config", NULL, flag_n);
4594 exim_exit(EXIT_SUCCESS);
4598 /* Initialise subsystems as required */
4599 #ifndef DISABLE_DKIM
4605 /* Handle a request to deliver one or more messages that are already on the
4606 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4607 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4609 Delivery of specific messages is typically used for a small number when
4610 prodding by hand (when the option forced_delivery will be set) or when
4611 re-execing to regain root privilege. Each message delivery must happen in a
4612 separate process, so we fork a process for each one, and run them sequentially
4613 so that debugging output doesn't get intertwined, and to avoid spawning too
4614 many processes if a long list is given. However, don't fork for the last one;
4615 this saves a process in the common case when Exim is called to deliver just one
4618 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4620 if (prod_requires_admin && !admin_user)
4622 fprintf(stderr, "exim: Permission denied\n");
4623 exim_exit(EXIT_FAILURE);
4625 set_process_info("delivering specified messages");
4626 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4627 for (i = msg_action_arg; i < argc; i++)
4632 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4633 else if ((pid = fork()) == 0)
4635 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4636 _exit(EXIT_SUCCESS);
4640 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4642 exim_exit(EXIT_FAILURE);
4646 exim_exit(EXIT_SUCCESS);
4650 /* If only a single queue run is requested, without SMTP listening, we can just
4651 turn into a queue runner, with an optional starting message id. */
4653 if (queue_interval == 0 && !daemon_listen)
4655 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4656 (start_queue_run_id == NULL)? US"" : US" starting at ",
4657 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4658 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4659 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4660 set_process_info("running the queue (single queue run)");
4661 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4662 exim_exit(EXIT_SUCCESS);
4666 /* Find the login name of the real user running this process. This is always
4667 needed when receiving a message, because it is written into the spool file. It
4668 may also be used to construct a from: or a sender: header, and in this case we
4669 need the user's full name as well, so save a copy of it, checked for RFC822
4670 syntax and munged if necessary, if it hasn't previously been set by the -F
4671 argument. We may try to get the passwd entry more than once, in case NIS or
4672 other delays are in evidence. Save the home directory for use in filter testing
4677 if ((pw = getpwuid(real_uid)) != NULL)
4679 originator_login = string_copy(US pw->pw_name);
4680 originator_home = string_copy(US pw->pw_dir);
4682 /* If user name has not been set by -F, set it from the passwd entry
4683 unless -f has been used to set the sender address by a trusted user. */
4685 if (originator_name == NULL)
4687 if (sender_address == NULL ||
4688 (!trusted_caller && filter_test == FTEST_NONE))
4690 uschar *name = US pw->pw_gecos;
4691 uschar *amp = Ustrchr(name, '&');
4694 /* Most Unix specify that a '&' character in the gecos field is
4695 replaced by a copy of the login name, and some even specify that
4696 the first character should be upper cased, so that's what we do. */
4701 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4702 amp - name, name, &loffset, originator_login, amp + 1);
4703 buffer[loffset] = toupper(buffer[loffset]);
4707 /* If a pattern for matching the gecos field was supplied, apply
4708 it and then expand the name string. */
4710 if (gecos_pattern != NULL && gecos_name != NULL)
4713 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4715 if (regex_match_and_setup(re, name, 0, -1))
4717 uschar *new_name = expand_string(gecos_name);
4719 if (new_name != NULL)
4721 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4722 "gecos field \"%s\"\n", new_name, name);
4725 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4726 "\"%s\": %s\n", gecos_name, expand_string_message);
4728 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4729 "gecos field \"%s\"\n", gecos_pattern, name);
4730 store_free((void *)re);
4732 originator_name = string_copy(name);
4735 /* A trusted caller has used -f but not -F */
4737 else originator_name = US"";
4740 /* Break the retry loop */
4745 if (++i > finduser_retries) break;
4749 /* If we cannot get a user login, log the incident and give up, unless the
4750 configuration specifies something to use. When running in the test harness,
4751 any setting of unknown_login overrides the actual name. */
4753 if (originator_login == NULL || running_in_test_harness)
4755 if (unknown_login != NULL)
4757 originator_login = expand_string(unknown_login);
4758 if (originator_name == NULL && unknown_username != NULL)
4759 originator_name = expand_string(unknown_username);
4760 if (originator_name == NULL) originator_name = US"";
4762 if (originator_login == NULL)
4763 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4767 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4770 originator_name = string_copy(parse_fix_phrase(originator_name,
4771 Ustrlen(originator_name), big_buffer, big_buffer_size));
4773 /* If a message is created by this call of Exim, the uid/gid of its originator
4774 are those of the caller. These values are overridden if an existing message is
4775 read in from the spool. */
4777 originator_uid = real_uid;
4778 originator_gid = real_gid;
4780 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4781 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4783 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4784 returns. We leave this till here so that the originator_ fields are available
4785 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4788 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4792 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4793 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4794 "mua_wrapper is set");
4799 /* If the sender ident has not been set (by a trusted caller) set it to
4800 the caller. This will get overwritten below for an inetd call. If a trusted
4801 caller has set it empty, unset it. */
4803 if (sender_ident == NULL) sender_ident = originator_login;
4804 else if (sender_ident[0] == 0) sender_ident = NULL;
4806 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4807 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4808 originator_* variables set. */
4810 if (test_rewrite_arg >= 0)
4812 really_exim = FALSE;
4813 if (test_rewrite_arg >= argc)
4815 printf("-brw needs an address argument\n");
4816 exim_exit(EXIT_FAILURE);
4818 rewrite_test(argv[test_rewrite_arg]);
4819 exim_exit(EXIT_SUCCESS);
4822 /* A locally-supplied message is considered to be coming from a local user
4823 unless a trusted caller supplies a sender address with -f, or is passing in the
4824 message via SMTP (inetd invocation or otherwise). */
4826 if ((sender_address == NULL && !smtp_input) ||
4827 (!trusted_caller && filter_test == FTEST_NONE))
4829 sender_local = TRUE;
4831 /* A trusted caller can supply authenticated_sender and authenticated_id
4832 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4833 defaults except when host checking. */
4835 if (authenticated_sender == NULL && !host_checking)
4836 authenticated_sender = string_sprintf("%s@%s", originator_login,
4837 qualify_domain_sender);
4838 if (authenticated_id == NULL && !host_checking)
4839 authenticated_id = originator_login;
4842 /* Trusted callers are always permitted to specify the sender address.
4843 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4844 is specified is the empty address. However, if a trusted caller does not
4845 specify a sender address for SMTP input, we leave sender_address unset. This
4846 causes the MAIL commands to be honoured. */
4848 if ((!smtp_input && sender_address == NULL) ||
4849 !receive_check_set_sender(sender_address))
4851 /* Either the caller is not permitted to set a general sender, or this is
4852 non-SMTP input and the trusted caller has not set a sender. If there is no
4853 sender, or if a sender other than <> is set, override with the originator's
4854 login (which will get qualified below), except when checking things. */
4856 if (sender_address == NULL /* No sender_address set */
4858 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4859 !checking)) /* Not running tests, including filter tests */
4861 sender_address = originator_login;
4862 sender_address_forced = FALSE;
4863 sender_address_domain = 0;
4867 /* Remember whether an untrusted caller set the sender address */
4869 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4871 /* Ensure that the sender address is fully qualified unless it is the empty
4872 address, which indicates an error message, or doesn't exist (root caller, smtp
4873 interface, no -f argument). */
4875 if (sender_address != NULL && sender_address[0] != 0 &&
4876 sender_address_domain == 0)
4877 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4878 qualify_domain_sender);
4880 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4882 /* Handle a request to verify a list of addresses, or test them for delivery.
4883 This must follow the setting of the sender address, since routers can be
4884 predicated upon the sender. If no arguments are given, read addresses from
4885 stdin. Set debug_level to at least D_v to get full output for address testing.
4888 if (verify_address_mode || address_test_mode)
4891 int flags = vopt_qualify;
4893 if (verify_address_mode)
4895 if (!verify_as_sender) flags |= vopt_is_recipient;
4896 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4901 flags |= vopt_is_recipient;
4902 debug_selector |= D_v;
4903 debug_file = stderr;
4904 debug_fd = fileno(debug_file);
4905 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4908 if (recipients_arg < argc)
4910 while (recipients_arg < argc)
4912 uschar *s = argv[recipients_arg++];
4915 BOOL finished = FALSE;
4916 uschar *ss = parse_find_address_end(s, FALSE);
4917 if (*ss == ',') *ss = 0; else finished = TRUE;
4918 test_address(s, flags, &exit_value);
4921 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4928 uschar *s = get_stdinput(NULL, NULL);
4929 if (s == NULL) break;
4930 test_address(s, flags, &exit_value);
4934 exim_exit(exit_value);
4937 /* Handle expansion checking. Either expand items on the command line, or read
4938 from stdin if there aren't any. If -Mset was specified, load the message so
4939 that its variables can be used, but restrict this facility to admin users.
4940 Otherwise, if -bem was used, read a message from stdin. */
4944 dns_init(FALSE, FALSE, FALSE);
4945 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4947 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4950 fprintf(stderr, "exim: permission denied\n");
4953 message_id = argv[msg_action_arg];
4954 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4955 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4956 printf ("Failed to load message datafile %s\n", message_id);
4957 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4958 printf ("Failed to load message %s\n", message_id);
4961 /* Read a test message from a file. We fudge it up to be on stdin, saving
4962 stdin itself for later reading of expansion strings. */
4964 else if (expansion_test_message != NULL)
4966 int save_stdin = dup(0);
4967 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4970 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4972 return EXIT_FAILURE;
4975 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4976 message_ended = END_NOTENDED;
4977 read_message_body(receive_msg(extract_recipients));
4978 message_linecount += body_linecount;
4979 (void)dup2(save_stdin, 0);
4980 (void)close(save_stdin);
4981 clearerr(stdin); /* Required by Darwin */
4984 /* Allow $recipients for this testing */
4986 enable_dollar_recipients = TRUE;
4988 /* Expand command line items */
4990 if (recipients_arg < argc)
4992 while (recipients_arg < argc)
4994 uschar *s = argv[recipients_arg++];
4995 uschar *ss = expand_string(s);
4996 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4997 else printf("%s\n", CS ss);
5005 char *(*fn_readline)(const char *) = NULL;
5006 void (*fn_addhist)(const char *) = NULL;
5009 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5015 uschar *source = get_stdinput(fn_readline, fn_addhist);
5016 if (source == NULL) break;
5017 ss = expand_string(source);
5019 printf ("Failed: %s\n", expand_string_message);
5020 else printf("%s\n", CS ss);
5024 if (dlhandle != NULL) dlclose(dlhandle);
5028 /* The data file will be open after -Mset */
5030 if (deliver_datafile >= 0)
5032 (void)close(deliver_datafile);
5033 deliver_datafile = -1;
5036 exim_exit(EXIT_SUCCESS);
5040 /* The active host name is normally the primary host name, but it can be varied
5041 for hosts that want to play several parts at once. We need to ensure that it is
5042 set for host checking, and for receiving messages. */
5044 smtp_active_hostname = primary_hostname;
5045 if (raw_active_hostname != NULL)
5047 uschar *nah = expand_string(raw_active_hostname);
5050 if (!expand_string_forcedfail)
5051 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5052 "(smtp_active_hostname): %s", raw_active_hostname,
5053 expand_string_message);
5055 else if (nah[0] != 0) smtp_active_hostname = nah;
5058 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5059 given IP address so that the blocking and relay configuration can be tested.
5060 Unless a sender_ident was set by -oMt, we discard it (the default is the
5061 caller's login name). An RFC 1413 call is made only if we are running in the
5062 test harness and an incoming interface and both ports are specified, because
5063 there is no TCP/IP call to find the ident for. */
5070 if (!sender_ident_set)
5072 sender_ident = NULL;
5073 if (running_in_test_harness && sender_host_port != 0 &&
5074 interface_address != NULL && interface_port != 0)
5075 verify_get_ident(1413);
5078 /* In case the given address is a non-canonical IPv6 address, canonicize
5079 it. The code works for both IPv4 and IPv6, as it happens. */
5081 size = host_aton(sender_host_address, x);
5082 sender_host_address = store_get(48); /* large enough for full IPv6 */
5083 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5085 /* Now set up for testing */
5087 host_build_sender_fullhost();
5091 sender_local = FALSE;
5092 sender_host_notsocket = TRUE;
5093 debug_file = stderr;
5094 debug_fd = fileno(debug_file);
5095 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5096 "**** but without any ident (RFC 1413) callback.\n"
5097 "**** This is not for real!\n\n",
5098 sender_host_address);
5100 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5101 if (verify_check_host(&hosts_connection_nolog) == OK)
5102 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5103 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5105 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5106 because a log line has already been written for all its failure exists
5107 (usually "connection refused: <reason>") and writing another one is
5108 unnecessary clutter. */
5110 if (smtp_start_session())
5112 reset_point = store_get(0);
5115 store_reset(reset_point);
5116 if (smtp_setup_msg() <= 0) break;
5117 if (!receive_msg(FALSE)) break;
5121 exim_exit(EXIT_SUCCESS);
5125 /* Arrange for message reception if recipients or SMTP were specified;
5126 otherwise complain unless a version print (-bV) happened or this is a filter
5127 verification test or info dump.
5128 In the former case, show the configuration file name. */
5130 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5132 if (version_printed)
5134 printf("Configuration file is %s\n", config_main_filename);
5135 return EXIT_SUCCESS;
5138 if (info_flag != CMDINFO_NONE)
5140 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5141 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5144 if (filter_test == FTEST_NONE)
5145 exim_usage(called_as);
5149 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5150 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5151 that we are not called from inetd, because that is rejected above. The
5152 following configuration settings are forced here:
5154 (1) Synchronous delivery (-odi)
5155 (2) Errors to stderr (-oep == -oeq)
5156 (3) No parallel remote delivery
5157 (4) Unprivileged delivery
5159 We don't force overall queueing options because there are several of them;
5160 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5161 to override any SMTP queueing. */
5165 synchronous_delivery = TRUE;
5166 arg_error_handling = ERRORS_STDERR;
5167 remote_max_parallel = 1;
5168 deliver_drop_privilege = TRUE;
5170 queue_smtp_domains = NULL;
5172 message_utf8_downconvert = -1; /* convert-if-needed */
5177 /* Prepare to accept one or more new messages on the standard input. When a
5178 message has been read, its id is returned in message_id[]. If doing immediate
5179 delivery, we fork a delivery process for each received message, except for the
5180 last one, where we can save a process switch.
5182 It is only in non-smtp mode that error_handling is allowed to be changed from
5183 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5184 sendmail error modes other than -oem ever actually used? Later: yes.) */
5186 if (!smtp_input) error_handling = arg_error_handling;
5188 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5189 logging being sent down the socket and make an identd call to get the
5194 (void)fclose(stderr);
5195 exim_nullstd(); /* Re-open to /dev/null */
5196 verify_get_ident(IDENT_PORT);
5197 host_build_sender_fullhost();
5198 set_process_info("handling incoming connection from %s via inetd",
5202 /* If the sender host address has been set, build sender_fullhost if it hasn't
5203 already been done (which it will have been for inetd). This caters for the
5204 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5205 so that the test for IP options is skipped for -bs input. */
5207 if (sender_host_address != NULL && sender_fullhost == NULL)
5209 host_build_sender_fullhost();
5210 set_process_info("handling incoming connection from %s via -oMa",
5212 sender_host_notsocket = TRUE;
5215 /* Otherwise, set the sender host as unknown except for inetd calls. This
5216 prevents host checking in the case of -bs not from inetd and also for -bS. */
5218 else if (!is_inetd) sender_host_unknown = TRUE;
5220 /* If stdout does not exist, then dup stdin to stdout. This can happen
5221 if exim is started from inetd. In this case fd 0 will be set to the socket,
5222 but fd 1 will not be set. This also happens for passed SMTP channels. */
5224 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5226 /* Set up the incoming protocol name and the state of the program. Root is
5227 allowed to force received protocol via the -oMr option above. If we have come
5228 via inetd, the process info has already been set up. We don't set
5229 received_protocol here for smtp input, as it varies according to
5230 batch/HELO/EHLO/AUTH/TLS. */
5234 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5235 smtp_batched_input? "batched " : "",
5236 (sender_address!= NULL)? sender_address : originator_login);
5240 if (received_protocol == NULL)
5241 received_protocol = string_sprintf("local%s", called_as);
5242 set_process_info("accepting a local non-SMTP message from <%s>",
5246 /* Initialize the session_local_queue-only flag (this will be ignored if
5247 mua_wrapper is set) */
5250 session_local_queue_only = queue_only;
5252 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5253 the spool if so configured. On failure, we must not attempt to send an error
5254 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5255 error code is given.) */
5257 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5259 fprintf(stderr, "exim: insufficient disk space\n");
5260 return EXIT_FAILURE;
5263 /* If this is smtp input of any kind, real or batched, handle the start of the
5266 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5267 because a log line has already been written for all its failure exists
5268 (usually "connection refused: <reason>") and writing another one is
5269 unnecessary clutter. */
5275 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5276 if (verify_check_host(&hosts_connection_nolog) == OK)
5277 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5278 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5279 if (!smtp_start_session())
5282 exim_exit(EXIT_SUCCESS);
5286 /* Otherwise, set up the input size limit here. */
5290 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5291 if (expand_string_message != NULL)
5293 if (thismessage_size_limit == -1)
5294 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5295 "message_size_limit: %s", expand_string_message);
5297 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5298 "message_size_limit: %s", expand_string_message);
5302 /* Loop for several messages when reading SMTP input. If we fork any child
5303 processes, we don't want to wait for them unless synchronous delivery is
5304 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5305 same as SIG_DFL, despite the fact that documentation often lists the default as
5306 "ignore". This is a confusing area. This is what I know:
5308 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5309 processes that complete simply to go away without ever becoming defunct. You
5310 can't then wait for them - but we don't want to wait for them in the
5311 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5312 happen for all OS (e.g. *BSD is different).
5314 But that's not the end of the story. Some (many? all?) systems have the
5315 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5316 has by default, so it seems that the difference is merely one of default
5317 (compare restarting vs non-restarting signals).
5319 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5320 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5321 of the loop below. Paranoia rules.
5323 February 2003: That's *still* not the end of the story. There are now versions
5324 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5325 process then calls waitpid(), a grumble is written to the system log, because
5326 this is logically inconsistent. In other words, it doesn't like the paranoia.
5327 As a consequenc of this, the waitpid() below is now excluded if we are sure
5328 that SIG_IGN works. */
5330 if (!synchronous_delivery)
5333 struct sigaction act;
5334 act.sa_handler = SIG_IGN;
5335 sigemptyset(&(act.sa_mask));
5336 act.sa_flags = SA_NOCLDWAIT;
5337 sigaction(SIGCHLD, &act, NULL);
5339 signal(SIGCHLD, SIG_IGN);
5343 /* Save the current store pool point, for resetting at the start of
5344 each message, and save the real sender address, if any. */
5346 reset_point = store_get(0);
5347 real_sender_address = sender_address;
5349 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5350 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5355 store_reset(reset_point);
5358 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5359 input and build the recipients list, before calling receive_msg() to read the
5360 message proper. Whatever sender address is given in the SMTP transaction is
5361 often ignored for local senders - we use the actual sender, which is normally
5362 either the underlying user running this process or a -f argument provided by
5363 a trusted caller. It is saved in real_sender_address. The test for whether to
5364 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5369 if ((rc = smtp_setup_msg()) > 0)
5371 if (real_sender_address != NULL &&
5372 !receive_check_set_sender(sender_address))
5374 sender_address = raw_sender = real_sender_address;
5375 sender_address_unrewritten = NULL;
5378 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5379 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5380 the very end. The result of the ACL is ignored (as for other non-SMTP
5381 messages). It is run for its potential side effects. */
5383 if (smtp_batched_input && acl_not_smtp_start != NULL)
5385 uschar *user_msg, *log_msg;
5386 enable_dollar_recipients = TRUE;
5387 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5388 &user_msg, &log_msg);
5389 enable_dollar_recipients = FALSE;
5392 /* Now get the data for the message */
5394 more = receive_msg(extract_recipients);
5395 if (message_id[0] == 0)
5398 smtp_log_no_mail(); /* Log no mail if configured */
5399 exim_exit(EXIT_FAILURE);
5404 smtp_log_no_mail(); /* Log no mail if configured */
5405 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5409 /* In the non-SMTP case, we have all the information from the command
5410 line, but must process it in case it is in the more general RFC822
5411 format, and in any case, to detect syntax errors. Also, it appears that
5412 the use of comma-separated lists as single arguments is common, so we
5413 had better support them. */
5419 int count = argc - recipients_arg;
5420 uschar **list = argv + recipients_arg;
5422 /* These options cannot be changed dynamically for non-SMTP messages */
5424 active_local_sender_retain = local_sender_retain;
5425 active_local_from_check = local_from_check;
5427 /* Save before any rewriting */
5429 raw_sender = string_copy(sender_address);
5431 /* Loop for each argument */
5433 for (i = 0; i < count; i++)
5435 int start, end, domain;
5437 uschar *s = list[i];
5439 /* Loop for each comma-separated address */
5443 BOOL finished = FALSE;
5445 uschar *ss = parse_find_address_end(s, FALSE);
5447 if (*ss == ',') *ss = 0; else finished = TRUE;
5449 /* Check max recipients - if -t was used, these aren't recipients */
5451 if (recipients_max > 0 && ++rcount > recipients_max &&
5452 !extract_recipients)
5453 if (error_handling == ERRORS_STDERR)
5455 fprintf(stderr, "exim: too many recipients\n");
5456 exim_exit(EXIT_FAILURE);
5461 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5462 errors_sender_rc : EXIT_FAILURE;
5467 BOOL b = allow_utf8_domains;
5468 allow_utf8_domains = TRUE;
5471 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5474 if (string_is_utf8(recipient))
5475 message_smtputf8 = TRUE;
5477 allow_utf8_domains = b;
5480 if (domain == 0 && !allow_unqualified_recipient)
5483 errmess = US"unqualified recipient address not allowed";
5486 if (recipient == NULL)
5488 if (error_handling == ERRORS_STDERR)
5490 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5491 string_printing(list[i]), errmess);
5492 exim_exit(EXIT_FAILURE);
5498 eblock.text1 = string_printing(list[i]);
5499 eblock.text2 = errmess;
5501 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5502 errors_sender_rc : EXIT_FAILURE;
5506 receive_add_recipient(recipient, -1);
5509 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5513 /* Show the recipients when debugging */
5518 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5519 if (recipients_list != NULL)
5521 debug_printf("Recipients:\n");
5522 for (i = 0; i < recipients_count; i++)
5523 debug_printf(" %s\n", recipients_list[i].address);
5527 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5528 ignored; rejecting here would just add complication, and it can just as
5529 well be done later. Allow $recipients to be visible in the ACL. */
5531 if (acl_not_smtp_start != NULL)
5533 uschar *user_msg, *log_msg;
5534 enable_dollar_recipients = TRUE;
5535 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5536 &user_msg, &log_msg);
5537 enable_dollar_recipients = FALSE;
5540 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5541 will just read the headers for the message, and not write anything onto the
5544 message_ended = END_NOTENDED;
5545 more = receive_msg(extract_recipients);
5547 /* more is always FALSE here (not SMTP message) when reading a message
5548 for real; when reading the headers of a message for filter testing,
5549 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5551 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5552 } /* Non-SMTP message reception */
5554 /* If this is a filter testing run, there are headers in store, but
5555 no message on the spool. Run the filtering code in testing mode, setting
5556 the domain to the qualify domain and the local part to the current user,
5557 unless they have been set by options. The prefix and suffix are left unset
5558 unless specified. The the return path is set to to the sender unless it has
5559 already been set from a return-path header in the message. */
5561 if (filter_test != FTEST_NONE)
5563 deliver_domain = (ftest_domain != NULL)?
5564 ftest_domain : qualify_domain_recipient;
5565 deliver_domain_orig = deliver_domain;
5566 deliver_localpart = (ftest_localpart != NULL)?
5567 ftest_localpart : originator_login;
5568 deliver_localpart_orig = deliver_localpart;
5569 deliver_localpart_prefix = ftest_prefix;
5570 deliver_localpart_suffix = ftest_suffix;
5571 deliver_home = originator_home;
5573 if (return_path == NULL)
5575 printf("Return-path copied from sender\n");
5576 return_path = string_copy(sender_address);
5579 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5580 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5582 receive_add_recipient(
5583 string_sprintf("%s%s%s@%s",
5584 (ftest_prefix == NULL)? US"" : ftest_prefix,
5586 (ftest_suffix == NULL)? US"" : ftest_suffix,
5587 deliver_domain), -1);
5589 printf("Recipient = %s\n", recipients_list[0].address);
5590 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5591 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5593 if (chdir("/")) /* Get away from wherever the user is running this from */
5595 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5596 exim_exit(EXIT_FAILURE);
5599 /* Now we run either a system filter test, or a user filter test, or both.
5600 In the latter case, headers added by the system filter will persist and be
5601 available to the user filter. We need to copy the filter variables
5604 if ((filter_test & FTEST_SYSTEM) != 0)
5606 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5607 exim_exit(EXIT_FAILURE);
5610 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5612 if ((filter_test & FTEST_USER) != 0)
5614 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5615 exim_exit(EXIT_FAILURE);
5618 exim_exit(EXIT_SUCCESS);
5621 /* Else act on the result of message reception. We should not get here unless
5622 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5623 will be TRUE. If it is not, check on the number of messages received in this
5626 if (!session_local_queue_only &&
5627 smtp_accept_queue_per_connection > 0 &&
5628 receive_messagecount > smtp_accept_queue_per_connection)
5630 session_local_queue_only = TRUE;
5631 queue_only_reason = 2;
5634 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5635 and queue_only_load is set, check that the load average is below it. If it is
5636 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5637 default), we put the whole session into queue_only mode. It then remains this
5638 way for any subsequent messages on the same SMTP connection. This is a
5639 deliberate choice; even though the load average may fall, it doesn't seem
5640 right to deliver later messages on the same call when not delivering earlier
5641 ones. However, there are odd cases where this is not wanted, so this can be
5642 changed by setting queue_only_load_latch false. */
5644 local_queue_only = session_local_queue_only;
5645 if (!local_queue_only && queue_only_load >= 0)
5647 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5648 if (local_queue_only)
5650 queue_only_reason = 3;
5651 if (queue_only_load_latch) session_local_queue_only = TRUE;
5655 /* If running as an MUA wrapper, all queueing options and freezing options
5659 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5661 /* Log the queueing here, when it will get a message id attached, but
5662 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5665 if (local_queue_only) switch(queue_only_reason)
5668 log_write(L_delay_delivery,
5669 LOG_MAIN, "no immediate delivery: more than %d messages "
5670 "received in one connection", smtp_accept_queue_per_connection);
5674 log_write(L_delay_delivery,
5675 LOG_MAIN, "no immediate delivery: load average %.2f",
5676 (double)load_average/1000.0);
5680 /* Else do the delivery unless the ACL or local_scan() called for queue only
5681 or froze the message. Always deliver in a separate process. A fork failure is
5682 not a disaster, as the delivery will eventually happen on a subsequent queue
5683 run. The search cache must be tidied before the fork, as the parent will
5684 do it before exiting. The child will trigger a lookup failure and
5685 thereby defer the delivery if it tries to use (for example) a cached ldap
5686 connection that the parent has called unbind on. */
5688 else if (!queue_only_policy && !deliver_freeze)
5693 if ((pid = fork()) == 0)
5696 close_unwanted(); /* Close unwanted file descriptors and TLS */
5697 exim_nullstd(); /* Ensure std{in,out,err} exist */
5699 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5700 mode, deliver_drop_privilege is forced TRUE). */
5702 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5704 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5706 /* Control does not return here. */
5709 /* No need to re-exec */
5711 rc = deliver_message(message_id, FALSE, FALSE);
5713 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5714 EXIT_SUCCESS : EXIT_FAILURE);
5719 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5720 "process: %s", strerror(errno));
5723 /* In the parent, wait if synchronous delivery is required. This will
5724 always be the case in MUA wrapper mode. */
5726 else if (synchronous_delivery)
5729 while (wait(&status) != pid);
5730 if ((status & 0x00ff) != 0)
5731 log_write(0, LOG_MAIN|LOG_PANIC,
5732 "process %d crashed with signal %d while delivering %s",
5733 (int)pid, status & 0x00ff, message_id);
5734 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5738 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5739 automatically reaps children (see comments above the loop), clear away any
5740 finished subprocesses here, in case there are lots of messages coming in
5741 from the same source. */
5743 #ifndef SIG_IGN_WORKS
5744 while (waitpid(-1, NULL, WNOHANG) > 0);
5748 exim_exit(EXIT_SUCCESS); /* Never returns */
5749 return 0; /* To stop compiler warning */