1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnutls/gnutls.h>
17 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 extern void init_lookup_list(void);
26 /*************************************************
27 * Function interface to store functions *
28 *************************************************/
30 /* We need some real functions to pass to the PCRE regular expression library
31 for store allocation via Exim's store manager. The normal calls are actually
32 macros that pass over location information to make tracing easier. These
33 functions just interface to the standard macro calls. A good compiler will
34 optimize out the tail recursion and so not make them too expensive. There
35 are two sets of functions; one for use when we want to retain the compiled
36 regular expression for a long time; the other for short-term use. */
39 function_store_get(size_t size)
41 return store_get((int)size);
45 function_dummy_free(void *block) { block = block; }
48 function_store_malloc(size_t size)
50 return store_malloc((int)size);
54 function_store_free(void *block)
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
94 int options = PCRE_COPT;
99 pcre_malloc = function_store_malloc;
100 pcre_free = function_store_free;
102 if (caseless) options |= PCRE_CASELESS;
103 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
104 pcre_malloc = function_store_get;
105 pcre_free = function_dummy_free;
107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
108 "%s at offset %d while compiling %s", error, offset, pattern);
115 /*************************************************
116 * Execute regular expression and set strings *
117 *************************************************/
119 /* This function runs a regular expression match, and sets up the pointers to
120 the matched substrings.
123 re the compiled expression
124 subject the subject string
125 options additional PCRE options
126 setup if < 0 do full setup
127 if >= 0 setup from setup+1 onwards,
128 excluding the full matched string
130 Returns: TRUE or FALSE
134 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
136 int ovector[3*(EXPAND_MAXN+1)];
137 uschar * s = string_copy(subject); /* de-constifying */
138 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
139 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
141 if (n == 0) n = EXPAND_MAXN + 1;
145 expand_nmax = (setup < 0)? 0 : setup + 1;
146 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
148 expand_nstring[expand_nmax] = s + ovector[nn];
149 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 /*************************************************
160 * Set up processing details *
161 *************************************************/
163 /* Save a text string for dumping when SIGUSR1 is received.
164 Do checks for overruns.
166 Arguments: format and arguments, as for printf()
171 set_process_info(const char *format, ...)
175 sprintf(CS process_info, "%5d ", (int)getpid());
176 len = Ustrlen(process_info);
177 va_start(ap, format);
178 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
179 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
180 len = Ustrlen(process_info);
181 process_info[len+0] = '\n';
182 process_info[len+1] = '\0';
183 process_info_len = len + 1;
184 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
191 /*************************************************
192 * Handler for SIGUSR1 *
193 *************************************************/
195 /* SIGUSR1 causes any exim process to write to the process log details of
196 what it is currently doing. It will only be used if the OS is capable of
197 setting up a handler that causes automatic restarting of any system call
198 that is in progress at the time.
200 This function takes care to be signal-safe.
202 Argument: the signal number (SIGUSR1)
207 usr1_handler(int sig)
211 os_restarting_signal(sig, usr1_handler);
213 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
216 /* If we are already running as the Exim user, try to create it in the
217 current process (assuming spool_directory exists). Otherwise, if we are
218 root, do the creation in an exim:exim subprocess. */
220 int euid = geteuid();
221 if (euid == exim_uid)
222 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
223 else if (euid == root_uid)
224 fd = log_create_as_exim(process_log_path);
227 /* If we are neither exim nor root, or if we failed to create the log file,
228 give up. There is not much useful we can do with errors, since we don't want
229 to disrupt whatever is going on outside the signal handler. */
233 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
239 /*************************************************
241 *************************************************/
243 /* This handler is enabled most of the time that Exim is running. The handler
244 doesn't actually get used unless alarm() has been called to set a timer, to
245 place a time limit on a system call of some kind. When the handler is run, it
248 There are some other SIGALRM handlers that are used in special cases when more
249 than just a flag setting is required; for example, when reading a message's
250 input. These are normally set up in the code module that uses them, and the
251 SIGALRM handler is reset to this one afterwards.
253 Argument: the signal value (SIGALRM)
258 sigalrm_handler(int sig)
260 sig = sig; /* Keep picky compilers happy */
262 os_non_restarting_signal(SIGALRM, sigalrm_handler);
267 /*************************************************
268 * Sleep for a fractional time interval *
269 *************************************************/
271 /* This function is called by millisleep() and exim_wait_tick() to wait for a
272 period of time that may include a fraction of a second. The coding is somewhat
273 tedious. We do not expect setitimer() ever to fail, but if it does, the process
274 will wait for ever, so we panic in this instance. (There was a case of this
275 when a bug in a function that calls milliwait() caused it to pass invalid data.
276 That's when I added the check. :-)
278 We assume it to be not worth sleeping for under 100us; this value will
279 require revisiting as hardware advances. This avoids the issue of
280 a zero-valued timer setting meaning "never fire".
282 Argument: an itimerval structure containing the interval
287 milliwait(struct itimerval *itval)
290 sigset_t old_sigmask;
292 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
294 (void)sigemptyset(&sigmask); /* Empty mask */
295 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
296 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
297 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
298 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
299 "setitimer() failed: %s", strerror(errno));
300 (void)sigfillset(&sigmask); /* All signals */
301 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
302 (void)sigsuspend(&sigmask); /* Until SIGALRM */
303 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
309 /*************************************************
310 * Millisecond sleep function *
311 *************************************************/
313 /* The basic sleep() function has a granularity of 1 second, which is too rough
314 in some cases - for example, when using an increasing delay to slow down
317 Argument: number of millseconds
324 struct itimerval itval;
325 itval.it_interval.tv_sec = 0;
326 itval.it_interval.tv_usec = 0;
327 itval.it_value.tv_sec = msec/1000;
328 itval.it_value.tv_usec = (msec % 1000) * 1000;
334 /*************************************************
335 * Compare microsecond times *
336 *************************************************/
343 Returns: -1, 0, or +1
347 exim_tvcmp(struct timeval *t1, struct timeval *t2)
349 if (t1->tv_sec > t2->tv_sec) return +1;
350 if (t1->tv_sec < t2->tv_sec) return -1;
351 if (t1->tv_usec > t2->tv_usec) return +1;
352 if (t1->tv_usec < t2->tv_usec) return -1;
359 /*************************************************
360 * Clock tick wait function *
361 *************************************************/
363 /* Exim uses a time + a pid to generate a unique identifier in two places: its
364 message IDs, and in file names for maildir deliveries. Because some OS now
365 re-use pids within the same second, sub-second times are now being used.
366 However, for absolute certaintly, we must ensure the clock has ticked before
367 allowing the relevant process to complete. At the time of implementation of
368 this code (February 2003), the speed of processors is such that the clock will
369 invariably have ticked already by the time a process has done its job. This
370 function prepares for the time when things are faster - and it also copes with
371 clocks that go backwards.
374 then_tv A timeval which was used to create uniqueness; its usec field
375 has been rounded down to the value of the resolution.
376 We want to be sure the current time is greater than this.
377 resolution The resolution that was used to divide the microseconds
378 (1 for maildir, larger for message ids)
384 exim_wait_tick(struct timeval *then_tv, int resolution)
386 struct timeval now_tv;
387 long int now_true_usec;
389 (void)gettimeofday(&now_tv, NULL);
390 now_true_usec = now_tv.tv_usec;
391 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
393 if (exim_tvcmp(&now_tv, then_tv) <= 0)
395 struct itimerval itval;
396 itval.it_interval.tv_sec = 0;
397 itval.it_interval.tv_usec = 0;
398 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
399 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
401 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
402 negative value for the microseconds is possible only in the case when "now"
403 is more than a second less than "then". That means that itval.it_value.tv_sec
404 is greater than zero. The following correction is therefore safe. */
406 if (itval.it_value.tv_usec < 0)
408 itval.it_value.tv_usec += 1000000;
409 itval.it_value.tv_sec -= 1;
412 DEBUG(D_transport|D_receive)
414 if (!running_in_test_harness)
416 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
417 then_tv->tv_sec, (long) then_tv->tv_usec,
418 now_tv.tv_sec, (long) now_tv.tv_usec);
419 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
420 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
431 /*************************************************
432 * Call fopen() with umask 777 and adjust mode *
433 *************************************************/
435 /* Exim runs with umask(0) so that files created with open() have the mode that
436 is specified in the open() call. However, there are some files, typically in
437 the spool directory, that are created with fopen(). They end up world-writeable
438 if no precautions are taken. Although the spool directory is not accessible to
439 the world, this is an untidiness. So this is a wrapper function for fopen()
440 that sorts out the mode of the created file.
443 filename the file name
444 options the fopen() options
445 mode the required mode
447 Returns: the fopened FILE or NULL
451 modefopen(const uschar *filename, const char *options, mode_t mode)
453 mode_t saved_umask = umask(0777);
454 FILE *f = Ufopen(filename, options);
455 (void)umask(saved_umask);
456 if (f != NULL) (void)fchmod(fileno(f), mode);
463 /*************************************************
464 * Ensure stdin, stdout, and stderr exist *
465 *************************************************/
467 /* Some operating systems grumble if an exec() happens without a standard
468 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
469 file will be opened and will use these fd values, and then some other bit of
470 code will assume, for example, that it can write error messages to stderr.
471 This function ensures that fds 0, 1, and 2 are open if they do not already
472 exist, by connecting them to /dev/null.
474 This function is also used to ensure that std{in,out,err} exist at all times,
475 so that if any library that Exim calls tries to use them, it doesn't crash.
487 for (i = 0; i <= 2; i++)
489 if (fstat(i, &statbuf) < 0 && errno == EBADF)
491 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
492 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
493 string_open_failed(errno, "/dev/null"));
494 if (devnull != i) (void)dup2(devnull, i);
497 if (devnull > 2) (void)close(devnull);
503 /*************************************************
504 * Close unwanted file descriptors for delivery *
505 *************************************************/
507 /* This function is called from a new process that has been forked to deliver
508 an incoming message, either directly, or using exec.
510 We want any smtp input streams to be closed in this new process. However, it
511 has been observed that using fclose() here causes trouble. When reading in -bS
512 input, duplicate copies of messages have been seen. The files will be sharing a
513 file pointer with the parent process, and it seems that fclose() (at least on
514 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
515 least sometimes. Hence we go for closing the underlying file descriptors.
517 If TLS is active, we want to shut down the TLS library, but without molesting
518 the parent's SSL connection.
520 For delivery of a non-SMTP message, we want to close stdin and stdout (and
521 stderr unless debugging) because the calling process might have set them up as
522 pipes and be waiting for them to close before it waits for the submission
523 process to terminate. If they aren't closed, they hold up the calling process
524 until the initial delivery process finishes, which is not what we want.
526 Exception: We do want it for synchronous delivery!
528 And notwithstanding all the above, if D_resolver is set, implying resolver
529 debugging, leave stdout open, because that's where the resolver writes its
532 When we close stderr (which implies we've also closed stdout), we also get rid
533 of any controlling terminal.
545 tls_close(TRUE, FALSE); /* Shut down the TLS library */
547 (void)close(fileno(smtp_in));
548 (void)close(fileno(smtp_out));
553 (void)close(0); /* stdin */
554 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
555 if (debug_selector == 0) /* stderr */
557 if (!synchronous_delivery)
570 /*************************************************
572 *************************************************/
574 /* This function sets a new uid and gid permanently, optionally calling
575 initgroups() to set auxiliary groups. There are some special cases when running
576 Exim in unprivileged modes. In these situations the effective uid will not be
577 root; if we already have the right effective uid/gid, and don't need to
578 initialize any groups, leave things as they are.
583 igflag TRUE if initgroups() wanted
584 msg text to use in debugging output and failure log
586 Returns: nothing; bombs out on failure
590 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
592 uid_t euid = geteuid();
593 gid_t egid = getegid();
595 if (euid == root_uid || euid != uid || egid != gid || igflag)
597 /* At least one OS returns +1 for initgroups failure, so just check for
602 struct passwd *pw = getpwuid(uid);
605 if (initgroups(pw->pw_name, gid) != 0)
606 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
607 (long int)uid, strerror(errno));
609 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
610 "no passwd entry for uid=%ld", (long int)uid);
613 if (setgid(gid) < 0 || setuid(uid) < 0)
615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
616 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
620 /* Debugging output included uid/gid and all groups */
624 int group_count, save_errno;
625 gid_t group_list[NGROUPS_MAX];
626 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
627 (long int)geteuid(), (long int)getegid(), (long int)getpid());
628 group_count = getgroups(NGROUPS_MAX, group_list);
630 debug_printf(" auxiliary group list:");
634 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
636 else if (group_count < 0)
637 debug_printf(" <error: %s>", strerror(save_errno));
638 else debug_printf(" <none>");
646 /*************************************************
648 *************************************************/
650 /* Exim exits via this function so that it always clears up any open
656 Returns: does not return
664 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
665 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
672 /*************************************************
673 * Extract port from host address *
674 *************************************************/
676 /* Called to extract the port from the values given to -oMa and -oMi.
677 It also checks the syntax of the address, and terminates it before the
678 port data when a port is extracted.
681 address the address, with possible port on the end
683 Returns: the port, or zero if there isn't one
684 bombs out on a syntax error
688 check_port(uschar *address)
690 int port = host_address_extract_port(address);
691 if (string_is_ip_address(address, NULL) == 0)
693 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
701 /*************************************************
702 * Test/verify an address *
703 *************************************************/
705 /* This function is called by the -bv and -bt code. It extracts a working
706 address from a full RFC 822 address. This isn't really necessary per se, but it
707 has the effect of collapsing source routes.
711 flags flag bits for verify_address()
712 exit_value to be set for failures
718 test_address(uschar *s, int flags, int *exit_value)
720 int start, end, domain;
721 uschar *parse_error = NULL;
722 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
726 fprintf(stdout, "syntax error: %s\n", parse_error);
731 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
732 -1, -1, NULL, NULL, NULL);
733 if (rc == FAIL) *exit_value = 2;
734 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
740 /*************************************************
741 * Show supported features *
742 *************************************************/
744 /* This function is called for -bV/--version and for -d to output the optional
745 features of the current Exim binary.
747 Arguments: a FILE for printing
752 show_whats_supported(FILE *f)
756 #ifdef DB_VERSION_STRING
757 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
758 #elif defined(BTREEVERSION) && defined(HASHVERSION)
760 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
762 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
764 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
765 fprintf(f, "Probably ndbm\n");
766 #elif defined(USE_TDB)
767 fprintf(f, "Using tdb\n");
770 fprintf(f, "Probably GDBM (native mode)\n");
772 fprintf(f, "Probably GDBM (compatibility mode)\n");
776 fprintf(f, "Support for:");
777 #ifdef SUPPORT_CRYPTEQ
778 fprintf(f, " crypteq");
781 fprintf(f, " iconv()");
786 #ifdef HAVE_SETCLASSRESOURCES
787 fprintf(f, " use_setclassresources");
796 fprintf(f, " Expand_dlfunc");
798 #ifdef USE_TCP_WRAPPERS
799 fprintf(f, " TCPwrappers");
803 fprintf(f, " GnuTLS");
805 fprintf(f, " OpenSSL");
808 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
809 fprintf(f, " translate_ip_address");
811 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
812 fprintf(f, " move_frozen_messages");
814 #ifdef WITH_CONTENT_SCAN
815 fprintf(f, " Content_Scanning");
820 #ifdef WITH_OLD_DEMIME
821 fprintf(f, " Old_Demime");
823 #ifndef DISABLE_DNSSEC
824 fprintf(f, " DNSSEC");
832 #ifdef EXPERIMENTAL_SPF
833 fprintf(f, " Experimental_SPF");
835 #ifdef EXPERIMENTAL_SRS
836 fprintf(f, " Experimental_SRS");
838 #ifdef EXPERIMENTAL_BRIGHTMAIL
839 fprintf(f, " Experimental_Brightmail");
841 #ifdef EXPERIMENTAL_DANE
842 fprintf(f, " Experimental_DANE");
844 #ifdef EXPERIMENTAL_DCC
845 fprintf(f, " Experimental_DCC");
847 #ifdef EXPERIMENTAL_DMARC
848 fprintf(f, " Experimental_DMARC");
850 #ifdef EXPERIMENTAL_PROXY
851 fprintf(f, " Experimental_Proxy");
853 #ifdef EXPERIMENTAL_EVENT
854 fprintf(f, " Experimental_Event");
856 #ifdef EXPERIMENTAL_REDIS
857 fprintf(f, " Experimental_Redis");
859 #ifdef EXPERIMENTAL_SOCKS
860 fprintf(f, " Experimental_SOCKS");
862 #ifdef EXPERIMENTAL_INTERNATIONAL
863 fprintf(f, " Experimental_International");
867 fprintf(f, "Lookups (built-in):");
868 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
869 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
871 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
874 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
875 fprintf(f, " dbm dbmjz dbmnz");
877 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
878 fprintf(f, " dnsdb");
880 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
881 fprintf(f, " dsearch");
883 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
884 fprintf(f, " ibase");
886 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
887 fprintf(f, " ldap ldapdn ldapm");
889 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
890 fprintf(f, " mysql");
892 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
893 fprintf(f, " nis nis0");
895 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
896 fprintf(f, " nisplus");
898 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
899 fprintf(f, " oracle");
901 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
902 fprintf(f, " passwd");
904 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
905 fprintf(f, " pgsql");
907 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
908 fprintf(f, " sqlite");
910 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
911 fprintf(f, " testdb");
913 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
914 fprintf(f, " whoson");
918 fprintf(f, "Authenticators:");
920 fprintf(f, " cram_md5");
922 #ifdef AUTH_CYRUS_SASL
923 fprintf(f, " cyrus_sasl");
926 fprintf(f, " dovecot");
929 fprintf(f, " gsasl");
931 #ifdef AUTH_HEIMDAL_GSSAPI
932 fprintf(f, " heimdal_gssapi");
934 #ifdef AUTH_PLAINTEXT
935 fprintf(f, " plaintext");
945 fprintf(f, "Routers:");
947 fprintf(f, " accept");
949 #ifdef ROUTER_DNSLOOKUP
950 fprintf(f, " dnslookup");
952 #ifdef ROUTER_IPLITERAL
953 fprintf(f, " ipliteral");
955 #ifdef ROUTER_IPLOOKUP
956 fprintf(f, " iplookup");
958 #ifdef ROUTER_MANUALROUTE
959 fprintf(f, " manualroute");
961 #ifdef ROUTER_QUERYPROGRAM
962 fprintf(f, " queryprogram");
964 #ifdef ROUTER_REDIRECT
965 fprintf(f, " redirect");
969 fprintf(f, "Transports:");
970 #ifdef TRANSPORT_APPENDFILE
971 fprintf(f, " appendfile");
972 #ifdef SUPPORT_MAILDIR
973 fprintf(f, "/maildir");
975 #ifdef SUPPORT_MAILSTORE
976 fprintf(f, "/mailstore");
982 #ifdef TRANSPORT_AUTOREPLY
983 fprintf(f, " autoreply");
985 #ifdef TRANSPORT_LMTP
988 #ifdef TRANSPORT_PIPE
991 #ifdef TRANSPORT_SMTP
996 if (fixed_never_users[0] > 0)
999 fprintf(f, "Fixed never_users: ");
1000 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1001 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1002 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1005 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1007 /* Everything else is details which are only worth reporting when debugging.
1008 Perhaps the tls_version_report should move into this too. */
1013 /* clang defines __GNUC__ (at least, for me) so test for it first */
1014 #if defined(__clang__)
1015 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1016 #elif defined(__GNUC__)
1017 fprintf(f, "Compiler: GCC [%s]\n",
1021 "? unknown version ?"
1025 fprintf(f, "Compiler: <unknown>\n");
1029 tls_version_report(f);
1031 #ifdef EXPERIMENTAL_INTERNATIONAL
1032 utf8_version_report(f);
1035 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1036 if (authi->version_report)
1037 (*authi->version_report)(f);
1039 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1040 characters; unless it's an ancient version of PCRE in which case it
1042 #ifndef PCRE_PRERELEASE
1043 #define PCRE_PRERELEASE
1046 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1047 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1049 PCRE_MAJOR, PCRE_MINOR,
1050 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1053 #undef EXPAND_AND_QUOTE
1056 for (i = 0; i < lookup_list_count; i++)
1057 if (lookup_list[i]->version_report)
1058 lookup_list[i]->version_report(f);
1060 #ifdef WHITELIST_D_MACROS
1061 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1063 fprintf(f, "WHITELIST_D_MACROS unset\n");
1065 #ifdef TRUSTED_CONFIG_LIST
1066 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1068 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1075 /*************************************************
1076 * Show auxiliary information about Exim *
1077 *************************************************/
1080 show_exim_information(enum commandline_info request, FILE *stream)
1087 fprintf(stream, "Oops, something went wrong.\n");
1091 "The -bI: flag takes a string indicating which information to provide.\n"
1092 "If the string is not recognised, you'll get this help (on stderr).\n"
1094 " exim -bI:help this information\n"
1095 " exim -bI:dscp dscp value keywords known\n"
1096 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1100 for (pp = exim_sieve_extension_list; *pp; ++pp)
1101 fprintf(stream, "%s\n", *pp);
1104 dscp_list_to_stream(stream);
1110 /*************************************************
1111 * Quote a local part *
1112 *************************************************/
1114 /* This function is used when a sender address or a From: or Sender: header
1115 line is being created from the caller's login, or from an authenticated_id. It
1116 applies appropriate quoting rules for a local part.
1118 Argument: the local part
1119 Returns: the local part, quoted if necessary
1123 local_part_quote(uschar *lpart)
1125 BOOL needs_quote = FALSE;
1130 for (t = lpart; !needs_quote && *t != 0; t++)
1132 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1133 (*t != '.' || t == lpart || t[1] == 0);
1136 if (!needs_quote) return lpart;
1139 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1143 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1146 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1149 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1150 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1151 yield = string_cat(yield, &size, &ptr, nq, 1);
1155 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1163 /*************************************************
1164 * Load readline() functions *
1165 *************************************************/
1167 /* This function is called from testing executions that read data from stdin,
1168 but only when running as the calling user. Currently, only -be does this. The
1169 function loads the readline() function library and passes back the functions.
1170 On some systems, it needs the curses library, so load that too, but try without
1171 it if loading fails. All this functionality has to be requested at build time.
1174 fn_readline_ptr pointer to where to put the readline pointer
1175 fn_addhist_ptr pointer to where to put the addhistory function
1177 Returns: the dlopen handle or NULL on failure
1181 set_readline(char * (**fn_readline_ptr)(const char *),
1182 void (**fn_addhist_ptr)(const char *))
1185 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1187 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1188 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1190 if (dlhandle != NULL)
1192 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1193 * char * readline (const char *prompt);
1194 * void add_history (const char *string);
1196 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1197 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1201 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1210 /*************************************************
1211 * Get a line from stdin for testing things *
1212 *************************************************/
1214 /* This function is called when running tests that can take a number of lines
1215 of input (for example, -be and -bt). It handles continuations and trailing
1216 spaces. And prompting and a blank line output on eof. If readline() is in use,
1217 the arguments are non-NULL and provide the relevant functions.
1220 fn_readline readline function or NULL
1221 fn_addhist addhist function or NULL
1223 Returns: pointer to dynamic memory, or NULL at end of file
1227 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1232 uschar *yield = NULL;
1234 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1238 uschar buffer[1024];
1242 char *readline_line = NULL;
1243 if (fn_readline != NULL)
1245 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1246 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1247 p = US readline_line;
1252 /* readline() not in use */
1255 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1259 /* Handle the line */
1261 ss = p + (int)Ustrlen(p);
1262 while (ss > p && isspace(ss[-1])) ss--;
1266 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1269 yield = string_cat(yield, &size, &ptr, p, ss - p);
1272 if (fn_readline != NULL) free(readline_line);
1275 if (ss == p || yield[ptr-1] != '\\')
1283 if (yield == NULL) printf("\n");
1289 /*************************************************
1290 * Output usage information for the program *
1291 *************************************************/
1293 /* This function is called when there are no recipients
1294 or a specific --help argument was added.
1297 progname information on what name we were called by
1299 Returns: DOES NOT RETURN
1303 exim_usage(uschar *progname)
1306 /* Handle specific program invocation varients */
1307 if (Ustrcmp(progname, US"-mailq") == 0)
1310 "mailq - list the contents of the mail queue\n\n"
1311 "For a list of options, see the Exim documentation.\n");
1315 /* Generic usage - we output this whatever happens */
1317 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1318 "not directly from a shell command line. Options and/or arguments control\n"
1319 "what it does when called. For a list of options, see the Exim documentation.\n");
1326 /*************************************************
1327 * Validate that the macros given are okay *
1328 *************************************************/
1330 /* Typically, Exim will drop privileges if macros are supplied. In some
1331 cases, we want to not do so.
1333 Arguments: none (macros is a global)
1334 Returns: true if trusted, false otherwise
1338 macros_trusted(void)
1340 #ifdef WHITELIST_D_MACROS
1342 uschar *whitelisted, *end, *p, **whites, **w;
1343 int white_count, i, n;
1345 BOOL prev_char_item, found;
1350 #ifndef WHITELIST_D_MACROS
1354 /* We only trust -D overrides for some invoking users:
1355 root, the exim run-time user, the optional config owner user.
1356 I don't know why config-owner would be needed, but since they can own the
1357 config files anyway, there's no security risk to letting them override -D. */
1358 if ( ! ((real_uid == root_uid)
1359 || (real_uid == exim_uid)
1360 #ifdef CONFIGURE_OWNER
1361 || (real_uid == config_uid)
1365 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1369 /* Get a list of macros which are whitelisted */
1370 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1371 prev_char_item = FALSE;
1373 for (p = whitelisted; *p != '\0'; ++p)
1375 if (*p == ':' || isspace(*p))
1380 prev_char_item = FALSE;
1383 if (!prev_char_item)
1384 prev_char_item = TRUE;
1391 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1392 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1397 if (i == white_count)
1399 while (*p != '\0' && p < end)
1405 /* The list of macros should be very short. Accept the N*M complexity. */
1406 for (m = macros; m != NULL; m = m->next)
1409 for (w = whites; *w; ++w)
1410 if (Ustrcmp(*w, m->name) == 0)
1417 if (m->replacement == NULL)
1419 len = Ustrlen(m->replacement);
1422 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1423 0, PCRE_EOPT, NULL, 0);
1426 if (n != PCRE_ERROR_NOMATCH)
1427 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1431 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1437 /*************************************************
1438 * Entry point and high-level code *
1439 *************************************************/
1441 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1442 the appropriate action. All the necessary functions are present in the one
1443 binary. I originally thought one should split it up, but it turns out that so
1444 much of the apparatus is needed in each chunk that one might as well just have
1445 it all available all the time, which then makes the coding easier as well.
1448 argc count of entries in argv
1449 argv argument strings, with argv[0] being the program name
1451 Returns: EXIT_SUCCESS if terminated successfully
1452 EXIT_FAILURE otherwise, except when a message has been sent
1453 to the sender, and -oee was given
1457 main(int argc, char **cargv)
1459 uschar **argv = USS cargv;
1460 int arg_receive_timeout = -1;
1461 int arg_smtp_receive_timeout = -1;
1462 int arg_error_handling = error_handling;
1463 int filter_sfd = -1;
1464 int filter_ufd = -1;
1467 int list_queue_option = 0;
1469 int msg_action_arg = -1;
1470 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1471 int queue_only_reason = 0;
1473 int perl_start_option = 0;
1475 int recipients_arg = argc;
1476 int sender_address_domain = 0;
1477 int test_retry_arg = -1;
1478 int test_rewrite_arg = -1;
1479 BOOL arg_queue_only = FALSE;
1480 BOOL bi_option = FALSE;
1481 BOOL checking = FALSE;
1482 BOOL count_queue = FALSE;
1483 BOOL expansion_test = FALSE;
1484 BOOL extract_recipients = FALSE;
1485 BOOL flag_G = FALSE;
1486 BOOL flag_n = FALSE;
1487 BOOL forced_delivery = FALSE;
1488 BOOL f_end_dot = FALSE;
1489 BOOL deliver_give_up = FALSE;
1490 BOOL list_queue = FALSE;
1491 BOOL list_options = FALSE;
1492 BOOL local_queue_only;
1494 BOOL one_msg_action = FALSE;
1495 BOOL queue_only_set = FALSE;
1496 BOOL receiving_message = TRUE;
1497 BOOL sender_ident_set = FALSE;
1498 BOOL session_local_queue_only;
1500 BOOL removed_privilege = FALSE;
1501 BOOL usage_wanted = FALSE;
1502 BOOL verify_address_mode = FALSE;
1503 BOOL verify_as_sender = FALSE;
1504 BOOL version_printed = FALSE;
1505 uschar *alias_arg = NULL;
1506 uschar *called_as = US"";
1507 uschar *cmdline_syslog_name = NULL;
1508 uschar *start_queue_run_id = NULL;
1509 uschar *stop_queue_run_id = NULL;
1510 uschar *expansion_test_message = NULL;
1511 uschar *ftest_domain = NULL;
1512 uschar *ftest_localpart = NULL;
1513 uschar *ftest_prefix = NULL;
1514 uschar *ftest_suffix = NULL;
1515 uschar *log_oneline = NULL;
1516 uschar *malware_test_file = NULL;
1517 uschar *real_sender_address;
1518 uschar *originator_home = US"/";
1523 struct stat statbuf;
1524 pid_t passed_qr_pid = (pid_t)0;
1525 int passed_qr_pipe = -1;
1526 gid_t group_list[NGROUPS_MAX];
1528 /* For the -bI: flag */
1529 enum commandline_info info_flag = CMDINFO_NONE;
1530 BOOL info_stdout = FALSE;
1532 /* Possible options for -R and -S */
1534 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1536 /* Need to define this in case we need to change the environment in order
1537 to get rid of a bogus time zone. We have to make it char rather than uschar
1538 because some OS define it in /usr/include/unistd.h. */
1540 extern char **environ;
1542 /* If the Exim user and/or group and/or the configuration file owner/group were
1543 defined by ref:name at build time, we must now find the actual uid/gid values.
1544 This is a feature to make the lives of binary distributors easier. */
1546 #ifdef EXIM_USERNAME
1547 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1551 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1555 /* If ref:name uses a number as the name, route_finduser() returns
1556 TRUE with exim_uid set and pw coerced to NULL. */
1558 exim_gid = pw->pw_gid;
1559 #ifndef EXIM_GROUPNAME
1563 "exim: ref:name should specify a usercode, not a group.\n"
1564 "exim: can't let you get away with it unless you also specify a group.\n");
1571 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1577 #ifdef EXIM_GROUPNAME
1578 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1580 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1586 #ifdef CONFIGURE_OWNERNAME
1587 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1589 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1590 CONFIGURE_OWNERNAME);
1595 /* We default the system_filter_user to be the Exim run-time user, as a
1596 sane non-root value. */
1597 system_filter_uid = exim_uid;
1599 #ifdef CONFIGURE_GROUPNAME
1600 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1602 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1603 CONFIGURE_GROUPNAME);
1608 /* In the Cygwin environment, some initialization needs doing. It is fudged
1609 in by means of this macro. */
1615 /* Check a field which is patched when we are running Exim within its
1616 testing harness; do a fast initial check, and then the whole thing. */
1618 running_in_test_harness =
1619 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1621 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1622 at the start of a program; however, it seems that some environments do not
1623 follow this. A "strange" locale can affect the formatting of timestamps, so we
1626 setlocale(LC_ALL, "C");
1628 /* Set up the default handler for timing using alarm(). */
1630 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1632 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1633 because store_malloc writes a log entry on failure. */
1635 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1636 if (log_buffer == NULL)
1638 fprintf(stderr, "exim: failed to get store for log buffer\n");
1642 /* Initialize the default log options. */
1644 bits_set(log_selector, log_selector_size, log_default);
1646 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1647 NULL when the daemon is run and the file is closed. We have to use this
1648 indirection, because some systems don't allow writing to the variable "stderr".
1651 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1653 /* Arrange for the PCRE regex library to use our store functions. Note that
1654 the normal calls are actually macros that add additional arguments for
1655 debugging purposes so we have to assign specially constructed functions here.
1656 The default is to use store in the stacking pool, but this is overridden in the
1657 regex_must_compile() function. */
1659 pcre_malloc = function_store_get;
1660 pcre_free = function_dummy_free;
1662 /* Ensure there is a big buffer for temporary use in several places. It is put
1663 in malloc store so that it can be freed for enlargement if necessary. */
1665 big_buffer = store_malloc(big_buffer_size);
1667 /* Set up the handler for the data request signal, and set the initial
1668 descriptive text. */
1670 set_process_info("initializing");
1671 os_restarting_signal(SIGUSR1, usr1_handler);
1673 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1674 in the daemon code. For the rest of Exim's uses, we ignore it. */
1676 signal(SIGHUP, SIG_IGN);
1678 /* We don't want to die on pipe errors as the code is written to handle
1679 the write error instead. */
1681 signal(SIGPIPE, SIG_IGN);
1683 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1684 set to SIG_IGN. This causes subprocesses that complete before the parent
1685 process waits for them not to hang around, so when Exim calls wait(), nothing
1686 is there. The wait() code has been made robust against this, but let's ensure
1687 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1688 ending status. We use sigaction rather than plain signal() on those OS where
1689 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1690 problem on AIX with this.) */
1694 struct sigaction act;
1695 act.sa_handler = SIG_DFL;
1696 sigemptyset(&(act.sa_mask));
1698 sigaction(SIGCHLD, &act, NULL);
1701 signal(SIGCHLD, SIG_DFL);
1704 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1709 /* Set up the version number. Set up the leading 'E' for the external form of
1710 message ids, set the pointer to the internal form, and initialize it to
1711 indicate no message being processed. */
1714 message_id_option[0] = '-';
1715 message_id_external = message_id_option + 1;
1716 message_id_external[0] = 'E';
1717 message_id = message_id_external + 1;
1720 /* Set the umask to zero so that any files Exim creates using open() are
1721 created with the modes that it specifies. NOTE: Files created with fopen() have
1722 a problem, which was not recognized till rather late (February 2006). With this
1723 umask, such files will be world writeable. (They are all content scanning files
1724 in the spool directory, which isn't world-accessible, so this is not a
1725 disaster, but it's untidy.) I don't want to change this overall setting,
1726 however, because it will interact badly with the open() calls. Instead, there's
1727 now a function called modefopen() that fiddles with the umask while calling
1732 /* Precompile the regular expression for matching a message id. Keep this in
1733 step with the code that generates ids in the accept.c module. We need to do
1734 this here, because the -M options check their arguments for syntactic validity
1735 using mac_ismsgid, which uses this. */
1738 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1740 /* Precompile the regular expression that is used for matching an SMTP error
1741 code, possibly extended, at the start of an error message. Note that the
1742 terminating whitespace character is included. */
1745 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1748 #ifdef WHITELIST_D_MACROS
1749 /* Precompile the regular expression used to filter the content of macros
1750 given to -D for permissibility. */
1752 regex_whitelisted_macro =
1753 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1757 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1758 this seems to be a generally accepted convention, since one finds symbolic
1759 links called "mailq" in standard OS configurations. */
1761 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1762 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1765 receiving_message = FALSE;
1766 called_as = US"-mailq";
1769 /* If the program is called as "rmail" treat it as equivalent to
1770 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1771 i.e. preventing a single dot on a line from terminating the message, and
1772 returning with zero return code, even in cases of error (provided an error
1773 message has been sent). */
1775 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1776 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1779 called_as = US"-rmail";
1780 errors_sender_rc = EXIT_SUCCESS;
1783 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1784 this is a smail convention. */
1786 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1787 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1789 smtp_input = smtp_batched_input = TRUE;
1790 called_as = US"-rsmtp";
1793 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1794 this is a smail convention. */
1796 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1797 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1800 receiving_message = FALSE;
1801 called_as = US"-runq";
1804 /* If the program is called as "newaliases" treat it as equivalent to
1805 "exim -bi"; this is a sendmail convention. */
1807 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1808 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1811 receiving_message = FALSE;
1812 called_as = US"-newaliases";
1815 /* Save the original effective uid for a couple of uses later. It should
1816 normally be root, but in some esoteric environments it may not be. */
1818 original_euid = geteuid();
1820 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1821 to be the same as the real ones. This makes a difference only if Exim is setuid
1822 (or setgid) to something other than root, which could be the case in some
1823 special configurations. */
1825 real_uid = getuid();
1826 real_gid = getgid();
1828 if (real_uid == root_uid)
1830 rv = setgid(real_gid);
1833 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1834 (long int)real_gid, strerror(errno));
1837 rv = setuid(real_uid);
1840 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1841 (long int)real_uid, strerror(errno));
1846 /* If neither the original real uid nor the original euid was root, Exim is
1847 running in an unprivileged state. */
1849 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1851 /* Scan the program's arguments. Some can be dealt with right away; others are
1852 simply recorded for checking and handling afterwards. Do a high-level switch
1853 on the second character (the one after '-'), to save some effort. */
1855 for (i = 1; i < argc; i++)
1857 BOOL badarg = FALSE;
1858 uschar *arg = argv[i];
1862 /* An argument not starting with '-' is the start of a recipients list;
1863 break out of the options-scanning loop. */
1871 /* An option consistion of -- terminates the options */
1873 if (Ustrcmp(arg, "--") == 0)
1875 recipients_arg = i + 1;
1879 /* Handle flagged options */
1881 switchchar = arg[1];
1884 /* Make all -ex options synonymous with -oex arguments, since that
1885 is assumed by various callers. Also make -qR options synonymous with -R
1886 options, as that seems to be required as well. Allow for -qqR too, and
1887 the same for -S options. */
1889 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1890 Ustrncmp(arg+1, "qR", 2) == 0 ||
1891 Ustrncmp(arg+1, "qS", 2) == 0)
1893 switchchar = arg[2];
1896 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1898 switchchar = arg[3];
1900 queue_2stage = TRUE;
1903 /* Make -r synonymous with -f, since it is a documented alias */
1905 else if (arg[1] == 'r') switchchar = 'f';
1907 /* Make -ov synonymous with -v */
1909 else if (Ustrcmp(arg, "-ov") == 0)
1915 /* deal with --option_aliases */
1916 else if (switchchar == '-')
1918 if (Ustrcmp(argrest, "help") == 0)
1920 usage_wanted = TRUE;
1923 else if (Ustrcmp(argrest, "version") == 0)
1930 /* High-level switch on active initial letter */
1935 /* sendmail uses -Ac and -Am to control which .cf file is used;
1938 if (*argrest == '\0') { badarg = TRUE; break; }
1941 BOOL ignore = FALSE;
1946 if (*(argrest + 1) == '\0')
1950 if (!ignore) { badarg = TRUE; break; }
1954 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1955 so has no need of it. */
1958 if (*argrest == 0) i++; /* Skip over the type */
1963 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1965 /* -bd: Run in daemon mode, awaiting SMTP connections.
1966 -bdf: Ditto, but in the foreground.
1969 if (*argrest == 'd')
1971 daemon_listen = TRUE;
1972 if (*(++argrest) == 'f') background_daemon = FALSE;
1973 else if (*argrest != 0) { badarg = TRUE; break; }
1976 /* -be: Run in expansion test mode
1977 -bem: Ditto, but read a message from a file first
1980 else if (*argrest == 'e')
1982 expansion_test = checking = TRUE;
1983 if (argrest[1] == 'm')
1985 if (++i >= argc) { badarg = TRUE; break; }
1986 expansion_test_message = argv[i];
1989 if (argrest[1] != 0) { badarg = TRUE; break; }
1992 /* -bF: Run system filter test */
1994 else if (*argrest == 'F')
1996 filter_test |= FTEST_SYSTEM;
1997 if (*(++argrest) != 0) { badarg = TRUE; break; }
1998 if (++i < argc) filter_test_sfile = argv[i]; else
2000 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2005 /* -bf: Run user filter test
2006 -bfd: Set domain for filter testing
2007 -bfl: Set local part for filter testing
2008 -bfp: Set prefix for filter testing
2009 -bfs: Set suffix for filter testing
2012 else if (*argrest == 'f')
2014 if (*(++argrest) == 0)
2016 filter_test |= FTEST_USER;
2017 if (++i < argc) filter_test_ufile = argv[i]; else
2019 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2027 fprintf(stderr, "exim: string expected after %s\n", arg);
2030 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2031 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2032 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2033 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2034 else { badarg = TRUE; break; }
2038 /* -bh: Host checking - an IP address must follow. */
2040 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2042 if (++i >= argc) { badarg = TRUE; break; }
2043 sender_host_address = argv[i];
2044 host_checking = checking = log_testing_mode = TRUE;
2045 host_checking_callout = argrest[1] == 'c';
2048 /* -bi: This option is used by sendmail to initialize *the* alias file,
2049 though it has the -oA option to specify a different file. Exim has no
2050 concept of *the* alias file, but since Sun's YP make script calls
2051 sendmail this way, some support must be provided. */
2053 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2055 /* -bI: provide information, of the type to follow after a colon.
2056 This is an Exim flag. */
2058 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2060 uschar *p = &argrest[2];
2061 info_flag = CMDINFO_HELP;
2064 if (strcmpic(p, CUS"sieve") == 0)
2066 info_flag = CMDINFO_SIEVE;
2069 else if (strcmpic(p, CUS"dscp") == 0)
2071 info_flag = CMDINFO_DSCP;
2074 else if (strcmpic(p, CUS"help") == 0)
2081 /* -bm: Accept and deliver message - the default option. Reinstate
2082 receiving_message, which got turned off for all -b options. */
2084 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2086 /* -bmalware: test the filename given for malware */
2088 else if (Ustrcmp(argrest, "malware") == 0)
2090 if (++i >= argc) { badarg = TRUE; break; }
2091 malware_test_file = argv[i];
2094 /* -bnq: For locally originating messages, do not qualify unqualified
2095 addresses. In the envelope, this causes errors; in header lines they
2098 else if (Ustrcmp(argrest, "nq") == 0)
2100 allow_unqualified_sender = FALSE;
2101 allow_unqualified_recipient = FALSE;
2104 /* -bpxx: List the contents of the mail queue, in various forms. If
2105 the option is -bpc, just a queue count is needed. Otherwise, if the
2106 first letter after p is r, then order is random. */
2108 else if (*argrest == 'p')
2110 if (*(++argrest) == 'c')
2113 if (*(++argrest) != 0) badarg = TRUE;
2117 if (*argrest == 'r')
2119 list_queue_option = 8;
2122 else list_queue_option = 0;
2126 /* -bp: List the contents of the mail queue, top-level only */
2128 if (*argrest == 0) {}
2130 /* -bpu: List the contents of the mail queue, top-level undelivered */
2132 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2134 /* -bpa: List the contents of the mail queue, including all delivered */
2136 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2138 /* Unknown after -bp[r] */
2148 /* -bP: List the configuration variables given as the address list.
2149 Force -v, so configuration errors get displayed. */
2151 else if (Ustrcmp(argrest, "P") == 0)
2153 list_options = TRUE;
2154 debug_selector |= D_v;
2155 debug_file = stderr;
2158 /* -brt: Test retry configuration lookup */
2160 else if (Ustrcmp(argrest, "rt") == 0)
2162 test_retry_arg = i + 1;
2166 /* -brw: Test rewrite configuration */
2168 else if (Ustrcmp(argrest, "rw") == 0)
2170 test_rewrite_arg = i + 1;
2174 /* -bS: Read SMTP commands on standard input, but produce no replies -
2175 all errors are reported by sending messages. */
2177 else if (Ustrcmp(argrest, "S") == 0)
2178 smtp_input = smtp_batched_input = receiving_message = TRUE;
2180 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2181 on standard output. */
2183 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2185 /* -bt: address testing mode */
2187 else if (Ustrcmp(argrest, "t") == 0)
2188 address_test_mode = checking = log_testing_mode = TRUE;
2190 /* -bv: verify addresses */
2192 else if (Ustrcmp(argrest, "v") == 0)
2193 verify_address_mode = checking = log_testing_mode = TRUE;
2195 /* -bvs: verify sender addresses */
2197 else if (Ustrcmp(argrest, "vs") == 0)
2199 verify_address_mode = checking = log_testing_mode = TRUE;
2200 verify_as_sender = TRUE;
2203 /* -bV: Print version string and support details */
2205 else if (Ustrcmp(argrest, "V") == 0)
2207 printf("Exim version %s #%s built %s\n", version_string,
2208 version_cnumber, version_date);
2209 printf("%s\n", CS version_copyright);
2210 version_printed = TRUE;
2211 show_whats_supported(stdout);
2214 /* -bw: inetd wait mode, accept a listening socket as stdin */
2216 else if (*argrest == 'w')
2218 inetd_wait_mode = TRUE;
2219 background_daemon = FALSE;
2220 daemon_listen = TRUE;
2221 if (*(++argrest) != '\0')
2223 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2224 if (inetd_wait_timeout <= 0)
2226 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2236 /* -C: change configuration file list; ignore if it isn't really
2237 a change! Enforce a prefix check if required. */
2242 if(++i < argc) argrest = argv[i]; else
2243 { badarg = TRUE; break; }
2245 if (Ustrcmp(config_main_filelist, argrest) != 0)
2247 #ifdef ALT_CONFIG_PREFIX
2249 int len = Ustrlen(ALT_CONFIG_PREFIX);
2250 uschar *list = argrest;
2252 while((filename = string_nextinlist(&list, &sep, big_buffer,
2253 big_buffer_size)) != NULL)
2255 if ((Ustrlen(filename) < len ||
2256 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2257 Ustrstr(filename, "/../") != NULL) &&
2258 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2260 fprintf(stderr, "-C Permission denied\n");
2265 if (real_uid != root_uid)
2267 #ifdef TRUSTED_CONFIG_LIST
2269 if (real_uid != exim_uid
2270 #ifdef CONFIGURE_OWNER
2271 && real_uid != config_uid
2274 trusted_config = FALSE;
2277 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2280 struct stat statbuf;
2282 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2283 (statbuf.st_uid != root_uid /* owner not root */
2284 #ifdef CONFIGURE_OWNER
2285 && statbuf.st_uid != config_uid /* owner not the special one */
2288 (statbuf.st_gid != root_gid /* group not root */
2289 #ifdef CONFIGURE_GROUP
2290 && statbuf.st_gid != config_gid /* group not the special one */
2292 && (statbuf.st_mode & 020) != 0 /* group writeable */
2294 (statbuf.st_mode & 2) != 0) /* world writeable */
2296 trusted_config = FALSE;
2301 /* Well, the trust list at least is up to scratch... */
2302 void *reset_point = store_get(0);
2303 uschar *trusted_configs[32];
2307 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2309 uschar *start = big_buffer, *nl;
2310 while (*start && isspace(*start))
2314 nl = Ustrchr(start, '\n');
2317 trusted_configs[nr_configs++] = string_copy(start);
2318 if (nr_configs == 32)
2326 const uschar *list = argrest;
2328 while (trusted_config && (filename = string_nextinlist(&list,
2329 &sep, big_buffer, big_buffer_size)) != NULL)
2331 for (i=0; i < nr_configs; i++)
2333 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2336 if (i == nr_configs)
2338 trusted_config = FALSE;
2342 store_reset(reset_point);
2346 /* No valid prefixes found in trust_list file. */
2347 trusted_config = FALSE;
2353 /* Could not open trust_list file. */
2354 trusted_config = FALSE;
2358 /* Not root; don't trust config */
2359 trusted_config = FALSE;
2363 config_main_filelist = argrest;
2364 config_changed = TRUE;
2369 /* -D: set up a macro definition */
2372 #ifdef DISABLE_D_OPTION
2373 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2378 macro_item *mlast = NULL;
2381 uschar *s = argrest;
2383 while (isspace(*s)) s++;
2385 if (*s < 'A' || *s > 'Z')
2387 fprintf(stderr, "exim: macro name set by -D must start with "
2388 "an upper case letter\n");
2392 while (isalnum(*s) || *s == '_')
2394 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2398 if (ptr == 0) { badarg = TRUE; break; }
2399 while (isspace(*s)) s++;
2402 if (*s++ != '=') { badarg = TRUE; break; }
2403 while (isspace(*s)) s++;
2406 for (m = macros; m != NULL; m = m->next)
2408 if (Ustrcmp(m->name, name) == 0)
2410 fprintf(stderr, "exim: duplicated -D in command line\n");
2416 m = store_get(sizeof(macro_item) + Ustrlen(name));
2418 m->command_line = TRUE;
2419 if (mlast == NULL) macros = m; else mlast->next = m;
2420 Ustrcpy(m->name, name);
2421 m->replacement = string_copy(s);
2423 if (clmacro_count >= MAX_CLMACROS)
2425 fprintf(stderr, "exim: too many -D options on command line\n");
2428 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2434 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2435 The latter is now a no-op, retained for compatibility only. If -dd is used,
2436 debugging subprocesses of the daemon is disabled. */
2439 if (Ustrcmp(argrest, "ropcr") == 0)
2441 /* drop_cr = TRUE; */
2444 /* Use an intermediate variable so that we don't set debugging while
2445 decoding the debugging bits. */
2449 unsigned int selector = D_default;
2452 if (*argrest == 'd')
2454 debug_daemon = TRUE;
2458 decode_bits(&selector, 1, debug_notall, argrest,
2459 debug_options, debug_options_count, US"debug", 0);
2460 debug_selector = selector;
2465 /* -E: This is a local error message. This option is not intended for
2466 external use at all, but is not restricted to trusted callers because it
2467 does no harm (just suppresses certain error messages) and if Exim is run
2468 not setuid root it won't always be trusted when it generates error
2469 messages using this option. If there is a message id following -E, point
2470 message_reference at it, for logging. */
2473 local_error_message = TRUE;
2474 if (mac_ismsgid(argrest)) message_reference = argrest;
2478 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2479 option, so it looks as if historically the -oex options are also callable
2480 without the leading -o. So we have to accept them. Before the switch,
2481 anything starting -oe has been converted to -e. Exim does not support all
2482 of the sendmail error options. */
2485 if (Ustrcmp(argrest, "e") == 0)
2487 arg_error_handling = ERRORS_SENDER;
2488 errors_sender_rc = EXIT_SUCCESS;
2490 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2491 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2492 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2493 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2498 /* -F: Set sender's full name, used instead of the gecos entry from
2499 the password file. Since users can usually alter their gecos entries,
2500 there's no security involved in using this instead. The data can follow
2501 the -F or be in the next argument. */
2506 if(++i < argc) argrest = argv[i]; else
2507 { badarg = TRUE; break; }
2509 originator_name = argrest;
2510 sender_name_forced = TRUE;
2514 /* -f: Set sender's address - this value is only actually used if Exim is
2515 run by a trusted user, or if untrusted_set_sender is set and matches the
2516 address, except that the null address can always be set by any user. The
2517 test for this happens later, when the value given here is ignored when not
2518 permitted. For an untrusted user, the actual sender is still put in Sender:
2519 if it doesn't match the From: header (unless no_local_from_check is set).
2520 The data can follow the -f or be in the next argument. The -r switch is an
2521 obsolete form of -f but since there appear to be programs out there that
2522 use anything that sendmail has ever supported, better accept it - the
2523 synonymizing is done before the switch above.
2525 At this stage, we must allow domain literal addresses, because we don't
2526 know what the setting of allow_domain_literals is yet. Ditto for trailing
2527 dots and strip_trailing_dot. */
2531 int dummy_start, dummy_end;
2535 if (i+1 < argc) argrest = argv[++i]; else
2536 { badarg = TRUE; break; }
2539 sender_address = string_sprintf(""); /* Ensure writeable memory */
2542 uschar *temp = argrest + Ustrlen(argrest) - 1;
2543 while (temp >= argrest && isspace(*temp)) temp--;
2544 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2545 allow_domain_literals = TRUE;
2546 strip_trailing_dot = TRUE;
2547 #ifdef EXPERIMENTAL_INTERNATIONAL
2548 allow_utf8_domains = TRUE;
2550 sender_address = parse_extract_address(argrest, &errmess,
2551 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2552 #ifdef EXPERIMENTAL_INTERNATIONAL
2553 message_smtputf8 = string_is_utf8(sender_address);
2554 allow_utf8_domains = FALSE;
2556 allow_domain_literals = FALSE;
2557 strip_trailing_dot = FALSE;
2558 if (sender_address == NULL)
2560 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2561 return EXIT_FAILURE;
2564 sender_address_forced = TRUE;
2568 /* -G: sendmail invocation to specify that it's a gateway submission and
2569 sendmail may complain about problems instead of fixing them.
2570 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2571 not at this time complain about problems. */
2577 /* -h: Set the hop count for an incoming message. Exim does not currently
2578 support this; it always computes it by counting the Received: headers.
2579 To put it in will require a change to the spool header file format. */
2584 if(++i < argc) argrest = argv[i]; else
2585 { badarg = TRUE; break; }
2587 if (!isdigit(*argrest)) badarg = TRUE;
2591 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2592 not to be documented for sendmail but mailx (at least) uses it) */
2595 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2599 /* -L: set the identifier used for syslog; equivalent to setting
2600 syslog_processname in the config file, but needs to be an admin option. */
2603 if (*argrest == '\0')
2605 if(++i < argc) argrest = argv[i]; else
2606 { badarg = TRUE; break; }
2608 sz = Ustrlen(argrest);
2611 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2612 return EXIT_FAILURE;
2616 fprintf(stderr, "exim: the -L syslog name is too short\n");
2617 return EXIT_FAILURE;
2619 cmdline_syslog_name = argrest;
2623 receiving_message = FALSE;
2625 /* -MC: continue delivery of another message via an existing open
2626 file descriptor. This option is used for an internal call by the
2627 smtp transport when there is a pending message waiting to go to an
2628 address to which it has got a connection. Five subsequent arguments are
2629 required: transport name, host name, IP address, sequence number, and
2630 message_id. Transports may decline to create new processes if the sequence
2631 number gets too big. The channel is stdin. This (-MC) must be the last
2632 argument. There's a subsequent check that the real-uid is privileged.
2634 If we are running in the test harness. delay for a bit, to let the process
2635 that set this one up complete. This makes for repeatability of the logging,
2638 if (Ustrcmp(argrest, "C") == 0)
2640 union sockaddr_46 interface_sock;
2641 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2645 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2646 return EXIT_FAILURE;
2649 if (msg_action_arg >= 0)
2651 fprintf(stderr, "exim: incompatible arguments\n");
2652 return EXIT_FAILURE;
2655 continue_transport = argv[++i];
2656 continue_hostname = argv[++i];
2657 continue_host_address = argv[++i];
2658 continue_sequence = Uatoi(argv[++i]);
2659 msg_action = MSG_DELIVER;
2660 msg_action_arg = ++i;
2661 forced_delivery = TRUE;
2662 queue_run_pid = passed_qr_pid;
2663 queue_run_pipe = passed_qr_pipe;
2665 if (!mac_ismsgid(argv[i]))
2667 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2669 return EXIT_FAILURE;
2672 /* Set up $sending_ip_address and $sending_port */
2674 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2676 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2680 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2682 return EXIT_FAILURE;
2685 if (running_in_test_harness) millisleep(500);
2689 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2690 precedes -MC (see above). The flag indicates that the host to which
2691 Exim is connected has accepted an AUTH sequence. */
2693 else if (Ustrcmp(argrest, "CA") == 0)
2695 smtp_authenticated = TRUE;
2699 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2700 that exim is connected to supports the esmtp extension DSN */
2701 else if (Ustrcmp(argrest, "CD") == 0)
2703 smtp_use_dsn = TRUE;
2707 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2708 it preceded -MC (see above) */
2710 else if (Ustrcmp(argrest, "CP") == 0)
2712 smtp_use_pipelining = TRUE;
2716 /* -MCQ: pass on the pid of the queue-running process that started
2717 this chain of deliveries and the fd of its synchronizing pipe; this
2718 is useful only when it precedes -MC (see above) */
2720 else if (Ustrcmp(argrest, "CQ") == 0)
2722 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2724 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2729 /* -MCS: set the smtp_use_size flag; this is useful only when it
2730 precedes -MC (see above) */
2732 else if (Ustrcmp(argrest, "CS") == 0)
2734 smtp_use_size = TRUE;
2738 /* -MCT: set the tls_offered flag; this is useful only when it
2739 precedes -MC (see above). The flag indicates that the host to which
2740 Exim is connected has offered TLS support. */
2743 else if (Ustrcmp(argrest, "CT") == 0)
2750 /* -M[x]: various operations on the following list of message ids:
2751 -M deliver the messages, ignoring next retry times and thawing
2752 -Mc deliver the messages, checking next retry times, no thawing
2753 -Mf freeze the messages
2754 -Mg give up on the messages
2755 -Mt thaw the messages
2756 -Mrm remove the messages
2757 In the above cases, this must be the last option. There are also the
2758 following options which are followed by a single message id, and which
2759 act on that message. Some of them use the "recipient" addresses as well.
2760 -Mar add recipient(s)
2761 -Mmad mark all recipients delivered
2762 -Mmd mark recipients(s) delivered
2764 -Mset load a message for use with -be
2766 -Mvc show copy (of whole message, in RFC 2822 format)
2771 else if (*argrest == 0)
2773 msg_action = MSG_DELIVER;
2774 forced_delivery = deliver_force_thaw = TRUE;
2776 else if (Ustrcmp(argrest, "ar") == 0)
2778 msg_action = MSG_ADD_RECIPIENT;
2779 one_msg_action = TRUE;
2781 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2782 else if (Ustrcmp(argrest, "es") == 0)
2784 msg_action = MSG_EDIT_SENDER;
2785 one_msg_action = TRUE;
2787 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2788 else if (Ustrcmp(argrest, "g") == 0)
2790 msg_action = MSG_DELIVER;
2791 deliver_give_up = TRUE;
2793 else if (Ustrcmp(argrest, "mad") == 0)
2795 msg_action = MSG_MARK_ALL_DELIVERED;
2797 else if (Ustrcmp(argrest, "md") == 0)
2799 msg_action = MSG_MARK_DELIVERED;
2800 one_msg_action = TRUE;
2802 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2803 else if (Ustrcmp(argrest, "set") == 0)
2805 msg_action = MSG_LOAD;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2809 else if (Ustrcmp(argrest, "vb") == 0)
2811 msg_action = MSG_SHOW_BODY;
2812 one_msg_action = TRUE;
2814 else if (Ustrcmp(argrest, "vc") == 0)
2816 msg_action = MSG_SHOW_COPY;
2817 one_msg_action = TRUE;
2819 else if (Ustrcmp(argrest, "vh") == 0)
2821 msg_action = MSG_SHOW_HEADER;
2822 one_msg_action = TRUE;
2824 else if (Ustrcmp(argrest, "vl") == 0)
2826 msg_action = MSG_SHOW_LOG;
2827 one_msg_action = TRUE;
2829 else { badarg = TRUE; break; }
2831 /* All the -Mxx options require at least one message id. */
2833 msg_action_arg = i + 1;
2834 if (msg_action_arg >= argc)
2836 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2837 return EXIT_FAILURE;
2840 /* Some require only message ids to follow */
2842 if (!one_msg_action)
2845 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2847 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2849 return EXIT_FAILURE;
2851 goto END_ARG; /* Remaining args are ids */
2854 /* Others require only one message id, possibly followed by addresses,
2855 which will be handled as normal arguments. */
2859 if (!mac_ismsgid(argv[msg_action_arg]))
2861 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2862 argv[msg_action_arg], arg);
2863 return EXIT_FAILURE;
2870 /* Some programs seem to call the -om option without the leading o;
2871 for sendmail it askes for "me too". Exim always does this. */
2874 if (*argrest != 0) badarg = TRUE;
2878 /* -N: don't do delivery - a debugging option that stops transports doing
2879 their thing. It implies debugging at the D_v level. */
2884 dont_deliver = TRUE;
2885 debug_selector |= D_v;
2886 debug_file = stderr;
2892 /* -n: This means "don't alias" in sendmail, apparently.
2893 For normal invocations, it has no effect.
2894 It may affect some other options. */
2900 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2901 option to the specified value. This form uses long names. We need to handle
2902 -O option=value and -Ooption=value. */
2909 fprintf(stderr, "exim: string expected after -O\n");
2917 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2920 if (*argrest == 'A')
2922 alias_arg = argrest + 1;
2923 if (alias_arg[0] == 0)
2925 if (i+1 < argc) alias_arg = argv[++i]; else
2927 fprintf(stderr, "exim: string expected after -oA\n");
2933 /* -oB: Set a connection message max value for remote deliveries */
2935 else if (*argrest == 'B')
2937 uschar *p = argrest + 1;
2940 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2942 connection_max_messages = 1;
2951 fprintf(stderr, "exim: number expected after -oB\n");
2954 connection_max_messages = Uatoi(p);
2958 /* -odb: background delivery */
2960 else if (Ustrcmp(argrest, "db") == 0)
2962 synchronous_delivery = FALSE;
2963 arg_queue_only = FALSE;
2964 queue_only_set = TRUE;
2967 /* -odf: foreground delivery (smail-compatible option); same effect as
2968 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2971 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2973 synchronous_delivery = TRUE;
2974 arg_queue_only = FALSE;
2975 queue_only_set = TRUE;
2978 /* -odq: queue only */
2980 else if (Ustrcmp(argrest, "dq") == 0)
2982 synchronous_delivery = FALSE;
2983 arg_queue_only = TRUE;
2984 queue_only_set = TRUE;
2987 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2988 but no remote delivery */
2990 else if (Ustrcmp(argrest, "dqs") == 0)
2993 arg_queue_only = FALSE;
2994 queue_only_set = TRUE;
2997 /* -oex: Sendmail error flags. As these are also accepted without the
2998 leading -o prefix, for compatibility with vacation and other callers,
2999 they are handled with -e above. */
3001 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3002 -oitrue: Another sendmail syntax for the same */
3004 else if (Ustrcmp(argrest, "i") == 0 ||
3005 Ustrcmp(argrest, "itrue") == 0)
3008 /* -oM*: Set various characteristics for an incoming message; actually
3009 acted on for trusted callers only. */
3011 else if (*argrest == 'M')
3015 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3019 /* -oMa: Set sender host address */
3021 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3023 /* -oMaa: Set authenticator name */
3025 else if (Ustrcmp(argrest, "Maa") == 0)
3026 sender_host_authenticated = argv[++i];
3028 /* -oMas: setting authenticated sender */
3030 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3032 /* -oMai: setting authenticated id */
3034 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3036 /* -oMi: Set incoming interface address */
3038 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3040 /* -oMm: Message reference */
3042 else if (Ustrcmp(argrest, "Mm") == 0)
3044 if (!mac_ismsgid(argv[i+1]))
3046 fprintf(stderr,"-oMm must be a valid message ID\n");
3049 if (!trusted_config)
3051 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3054 message_reference = argv[++i];
3057 /* -oMr: Received protocol */
3059 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3061 /* -oMs: Set sender host name */
3063 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3065 /* -oMt: Set sender ident */
3067 else if (Ustrcmp(argrest, "Mt") == 0)
3069 sender_ident_set = TRUE;
3070 sender_ident = argv[++i];
3073 /* Else a bad argument */
3082 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3083 seem to call this as -m (undocumented), so that is also accepted (see
3086 else if (Ustrcmp(argrest, "m") == 0) {}
3088 /* -oo: An ancient flag for old-style addresses which still seems to
3089 crop up in some calls (see in SCO). */
3091 else if (Ustrcmp(argrest, "o") == 0) {}
3093 /* -oP <name>: set pid file path for daemon */
3095 else if (Ustrcmp(argrest, "P") == 0)
3096 override_pid_file_path = argv[++i];
3098 /* -or <n>: set timeout for non-SMTP acceptance
3099 -os <n>: set timeout for SMTP acceptance */
3101 else if (*argrest == 'r' || *argrest == 's')
3103 int *tp = (*argrest == 'r')?
3104 &arg_receive_timeout : &arg_smtp_receive_timeout;
3105 if (argrest[1] == 0)
3107 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3109 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3112 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3117 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3119 else if (Ustrcmp(argrest, "X") == 0)
3120 override_local_interfaces = argv[++i];
3122 /* Unknown -o argument */
3128 /* -ps: force Perl startup; -pd force delayed Perl startup */
3132 if (*argrest == 's' && argrest[1] == 0)
3134 perl_start_option = 1;
3137 if (*argrest == 'd' && argrest[1] == 0)
3139 perl_start_option = -1;
3144 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3145 which sets the host protocol and host name */
3149 if (i+1 < argc) argrest = argv[++i]; else
3150 { badarg = TRUE; break; }
3155 uschar *hn = Ustrchr(argrest, ':');
3158 received_protocol = argrest;
3162 received_protocol = string_copyn(argrest, hn - argrest);
3163 sender_host_name = hn + 1;
3170 receiving_message = FALSE;
3171 if (queue_interval >= 0)
3173 fprintf(stderr, "exim: -q specified more than once\n");
3177 /* -qq...: Do queue runs in a 2-stage manner */
3179 if (*argrest == 'q')
3181 queue_2stage = TRUE;
3185 /* -qi...: Do only first (initial) deliveries */
3187 if (*argrest == 'i')
3189 queue_run_first_delivery = TRUE;
3193 /* -qf...: Run the queue, forcing deliveries
3194 -qff..: Ditto, forcing thawing as well */
3196 if (*argrest == 'f')
3198 queue_run_force = TRUE;
3199 if (*(++argrest) == 'f')
3201 deliver_force_thaw = TRUE;
3206 /* -q[f][f]l...: Run the queue only on local deliveries */
3208 if (*argrest == 'l')
3210 queue_run_local = TRUE;
3214 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3215 optionally starting from a given message id. */
3217 if (*argrest == 0 &&
3218 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3221 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3222 start_queue_run_id = argv[++i];
3223 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3224 stop_queue_run_id = argv[++i];
3227 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3228 optionally local only. */
3233 queue_interval = readconf_readtime(argrest, 0, FALSE);
3235 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3236 if (queue_interval <= 0)
3238 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3245 case 'R': /* Synonymous with -qR... */
3246 receiving_message = FALSE;
3248 /* -Rf: As -R (below) but force all deliveries,
3249 -Rff: Ditto, but also thaw all frozen messages,
3250 -Rr: String is regex
3251 -Rrf: Regex and force
3252 -Rrff: Regex and force and thaw
3254 in all cases provided there are no further characters in this
3260 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3262 if (Ustrcmp(argrest, rsopts[i]) == 0)
3264 if (i != 2) queue_run_force = TRUE;
3265 if (i >= 2) deliver_selectstring_regex = TRUE;
3266 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3267 argrest += Ustrlen(rsopts[i]);
3272 /* -R: Set string to match in addresses for forced queue run to
3273 pick out particular messages. */
3277 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3279 fprintf(stderr, "exim: string expected after -R\n");
3283 else deliver_selectstring = argrest;
3287 /* -r: an obsolete synonym for -f (see above) */
3290 /* -S: Like -R but works on sender. */
3292 case 'S': /* Synonymous with -qS... */
3293 receiving_message = FALSE;
3295 /* -Sf: As -S (below) but force all deliveries,
3296 -Sff: Ditto, but also thaw all frozen messages,
3297 -Sr: String is regex
3298 -Srf: Regex and force
3299 -Srff: Regex and force and thaw
3301 in all cases provided there are no further characters in this
3307 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3309 if (Ustrcmp(argrest, rsopts[i]) == 0)
3311 if (i != 2) queue_run_force = TRUE;
3312 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3313 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3314 argrest += Ustrlen(rsopts[i]);
3319 /* -S: Set string to match in addresses for forced queue run to
3320 pick out particular messages. */
3324 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3326 fprintf(stderr, "exim: string expected after -S\n");
3330 else deliver_selectstring_sender = argrest;
3333 /* -Tqt is an option that is exclusively for use by the testing suite.
3334 It is not recognized in other circumstances. It allows for the setting up
3335 of explicit "queue times" so that various warning/retry things can be
3336 tested. Otherwise variability of clock ticks etc. cause problems. */
3339 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3340 fudged_queue_times = argv[++i];
3345 /* -t: Set flag to extract recipients from body of message. */
3348 if (*argrest == 0) extract_recipients = TRUE;
3350 /* -ti: Set flag to extract recipients from body of message, and also
3351 specify that dot does not end the message. */
3353 else if (Ustrcmp(argrest, "i") == 0)
3355 extract_recipients = TRUE;
3359 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3362 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3369 /* -U: This means "initial user submission" in sendmail, apparently. The
3370 doc claims that in future sendmail may refuse syntactically invalid
3371 messages instead of fixing them. For the moment, we just ignore it. */
3377 /* -v: verify things - this is a very low-level debugging */
3382 debug_selector |= D_v;
3383 debug_file = stderr;
3389 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3391 The -x flag tells the sendmail command that mail from a local
3392 mail program has National Language Support (NLS) extended characters
3393 in the body of the mail item. The sendmail command can send mail with
3394 extended NLS characters across networks that normally corrupts these
3397 As Exim is 8-bit clean, it just ignores this flag. */
3400 if (*argrest != 0) badarg = TRUE;
3403 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3404 logs to that file. We swallow the parameter and otherwise ignore it. */
3407 if (*argrest == '\0')
3410 fprintf(stderr, "exim: string expected after -X\n");
3416 if (*argrest == '\0')
3417 if (++i < argc) log_oneline = argv[i]; else
3419 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3424 /* All other initial characters are errors */
3429 } /* End of high-level switch statement */
3431 /* Failed to recognize the option, or syntax error */
3435 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3436 "option %s\n", arg);
3442 /* If -R or -S have been specified without -q, assume a single queue run. */
3444 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3445 queue_interval < 0) queue_interval = 0;
3449 /* If usage_wanted is set we call the usage function - which never returns */
3450 if (usage_wanted) exim_usage(called_as);
3452 /* Arguments have been processed. Check for incompatibilities. */
3454 (smtp_input || extract_recipients || recipients_arg < argc) &&
3455 (daemon_listen || queue_interval >= 0 || bi_option ||
3456 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3457 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3460 msg_action_arg > 0 &&
3461 (daemon_listen || queue_interval >= 0 || list_options ||
3462 (checking && msg_action != MSG_LOAD) ||
3463 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3466 (daemon_listen || queue_interval >= 0) &&
3467 (sender_address != NULL || list_options || list_queue || checking ||
3471 daemon_listen && queue_interval == 0
3474 inetd_wait_mode && queue_interval >= 0
3478 (checking || smtp_input || extract_recipients ||
3479 filter_test != FTEST_NONE || bi_option)
3482 verify_address_mode &&
3483 (address_test_mode || smtp_input || extract_recipients ||
3484 filter_test != FTEST_NONE || bi_option)
3487 address_test_mode && (smtp_input || extract_recipients ||
3488 filter_test != FTEST_NONE || bi_option)
3491 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3495 deliver_selectstring != NULL && queue_interval < 0
3498 msg_action == MSG_LOAD &&
3499 (!expansion_test || expansion_test_message != NULL)
3503 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3507 /* If debugging is set up, set the file and the file descriptor to pass on to
3508 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3509 to run in the foreground. */
3511 if (debug_selector != 0)
3513 debug_file = stderr;
3514 debug_fd = fileno(debug_file);
3515 background_daemon = FALSE;
3516 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3517 if (debug_selector != D_v) /* -v only doesn't show this */
3519 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3520 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3522 if (!version_printed)
3523 show_whats_supported(stderr);
3527 /* When started with root privilege, ensure that the limits on the number of
3528 open files and the number of processes (where that is accessible) are
3529 sufficiently large, or are unset, in case Exim has been called from an
3530 environment where the limits are screwed down. Not all OS have the ability to
3531 change some of these limits. */
3535 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3541 #ifdef RLIMIT_NOFILE
3542 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3544 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3546 rlp.rlim_cur = rlp.rlim_max = 0;
3549 /* I originally chose 1000 as a nice big number that was unlikely to
3550 be exceeded. It turns out that some older OS have a fixed upper limit of
3553 if (rlp.rlim_cur < 1000)
3555 rlp.rlim_cur = rlp.rlim_max = 1000;
3556 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3558 rlp.rlim_cur = rlp.rlim_max = 256;
3559 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3560 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3567 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3569 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3571 rlp.rlim_cur = rlp.rlim_max = 0;
3574 #ifdef RLIM_INFINITY
3575 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3577 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3579 if (rlp.rlim_cur < 1000)
3581 rlp.rlim_cur = rlp.rlim_max = 1000;
3583 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3584 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3590 /* Exim is normally entered as root (but some special configurations are
3591 possible that don't do this). However, it always spins off sub-processes that
3592 set their uid and gid as required for local delivery. We don't want to pass on
3593 any extra groups that root may belong to, so we want to get rid of them all at
3596 We need to obey setgroups() at this stage, before possibly giving up root
3597 privilege for a changed configuration file, but later on we might need to
3598 check on the additional groups for the admin user privilege - can't do that
3599 till after reading the config, which might specify the exim gid. Therefore,
3600 save the group list here first. */
3602 group_count = getgroups(NGROUPS_MAX, group_list);
3603 if (group_count < 0)
3605 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3609 /* There is a fundamental difference in some BSD systems in the matter of
3610 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3611 known not to be different. On the "different" systems there is a single group
3612 list, and the first entry in it is the current group. On all other versions of
3613 Unix there is a supplementary group list, which is in *addition* to the current
3614 group. Consequently, to get rid of all extraneous groups on a "standard" system
3615 you pass over 0 groups to setgroups(), while on a "different" system you pass
3616 over a single group - the current group, which is always the first group in the
3617 list. Calling setgroups() with zero groups on a "different" system results in
3618 an error return. The following code should cope with both types of system.
3620 However, if this process isn't running as root, setgroups() can't be used
3621 since you have to be root to run it, even if throwing away groups. Not being
3622 root here happens only in some unusual configurations. We just ignore the
3625 if (setgroups(0, NULL) != 0)
3627 if (setgroups(1, group_list) != 0 && !unprivileged)
3629 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3634 /* If the configuration file name has been altered by an argument on the
3635 command line (either a new file name or a macro definition) and the caller is
3636 not root, or if this is a filter testing run, remove any setuid privilege the
3637 program has and run as the underlying user.
3639 The exim user is locked out of this, which severely restricts the use of -C
3642 Otherwise, set the real ids to the effective values (should be root unless run
3643 from inetd, which it can either be root or the exim uid, if one is configured).
3645 There is a private mechanism for bypassing some of this, in order to make it
3646 possible to test lots of configurations automatically, without having either to
3647 recompile each time, or to patch in an actual configuration file name and other
3648 values (such as the path name). If running in the test harness, pretend that
3649 configuration file changes and macro definitions haven't happened. */
3652 (!trusted_config || /* Config changed, or */
3653 !macros_trusted()) && /* impermissible macros and */
3654 real_uid != root_uid && /* Not root, and */
3655 !running_in_test_harness /* Not fudged */
3657 expansion_test /* expansion testing */
3659 filter_test != FTEST_NONE) /* Filter testing */
3661 setgroups(group_count, group_list);
3662 exim_setugid(real_uid, real_gid, FALSE,
3663 US"-C, -D, -be or -bf forces real uid");
3664 removed_privilege = TRUE;
3666 /* In the normal case when Exim is called like this, stderr is available
3667 and should be used for any logging information because attempts to write
3668 to the log will usually fail. To arrange this, we unset really_exim. However,
3669 if no stderr is available there is no point - we might as well have a go
3670 at the log (if it fails, syslog will be written).
3672 Note that if the invoker is Exim, the logs remain available. Messing with
3673 this causes unlogged successful deliveries. */
3675 if ((log_stderr != NULL) && (real_uid != exim_uid))
3676 really_exim = FALSE;
3679 /* Privilege is to be retained for the moment. It may be dropped later,
3680 depending on the job that this Exim process has been asked to do. For now, set
3681 the real uid to the effective so that subsequent re-execs of Exim are done by a
3684 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3686 /* If testing a filter, open the file(s) now, before wasting time doing other
3687 setups and reading the message. */
3689 if ((filter_test & FTEST_SYSTEM) != 0)
3691 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3694 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3696 return EXIT_FAILURE;
3700 if ((filter_test & FTEST_USER) != 0)
3702 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3705 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3707 return EXIT_FAILURE;
3711 /* Initialise lookup_list
3712 If debugging, already called above via version reporting.
3713 In either case, we initialise the list of available lookups while running
3714 as root. All dynamically modules are loaded from a directory which is
3715 hard-coded into the binary and is code which, if not a module, would be
3716 part of Exim already. Ability to modify the content of the directory
3717 is equivalent to the ability to modify a setuid binary!
3719 This needs to happen before we read the main configuration. */
3722 #ifdef EXPERIMENTAL_INTERNATIONAL
3723 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3726 /* Read the main runtime configuration data; this gives up if there
3727 is a failure. It leaves the configuration file open so that the subsequent
3728 configuration data for delivery can be read if needed. */
3732 /* If an action on specific messages is requested, or if a daemon or queue
3733 runner is being started, we need to know if Exim was called by an admin user.
3734 This is the case if the real user is root or exim, or if the real group is
3735 exim, or if one of the supplementary groups is exim or a group listed in
3736 admin_groups. We don't fail all message actions immediately if not admin_user,
3737 since some actions can be performed by non-admin users. Instead, set admin_user
3738 for later interrogation. */
3740 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3745 for (i = 0; i < group_count; i++)
3747 if (group_list[i] == exim_gid) admin_user = TRUE;
3748 else if (admin_groups != NULL)
3750 for (j = 1; j <= (int)(admin_groups[0]); j++)
3751 if (admin_groups[j] == group_list[i])
3752 { admin_user = TRUE; break; }
3754 if (admin_user) break;
3758 /* Another group of privileged users are the trusted users. These are root,
3759 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3760 are permitted to specify sender_addresses with -f on the command line, and
3761 other message parameters as well. */
3763 if (real_uid == root_uid || real_uid == exim_uid)
3764 trusted_caller = TRUE;
3769 if (trusted_users != NULL)
3771 for (i = 1; i <= (int)(trusted_users[0]); i++)
3772 if (trusted_users[i] == real_uid)
3773 { trusted_caller = TRUE; break; }
3776 if (!trusted_caller && trusted_groups != NULL)
3778 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3780 if (trusted_groups[i] == real_gid)
3781 trusted_caller = TRUE;
3782 else for (j = 0; j < group_count; j++)
3784 if (trusted_groups[i] == group_list[j])
3785 { trusted_caller = TRUE; break; }
3787 if (trusted_caller) break;
3792 /* Handle the decoding of logging options. */
3794 decode_bits(log_selector, log_selector_size, log_notall,
3795 log_selector_string, log_options, log_options_count, US"log", 0);
3800 debug_printf("configuration file is %s\n", config_main_filename);
3801 debug_printf("log selectors =");
3802 for (i = 0; i < log_selector_size; i++)
3803 debug_printf(" %08x", log_selector[i]);
3807 /* If domain literals are not allowed, check the sender address that was
3808 supplied with -f. Ditto for a stripped trailing dot. */
3810 if (sender_address != NULL)
3812 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3814 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3815 "allowed\n", sender_address);
3816 return EXIT_FAILURE;
3818 if (f_end_dot && !strip_trailing_dot)
3820 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3821 "(trailing dot not allowed)\n", sender_address);
3822 return EXIT_FAILURE;
3826 /* See if an admin user overrode our logging. */
3828 if (cmdline_syslog_name != NULL)
3832 syslog_processname = cmdline_syslog_name;
3833 log_file_path = string_copy(CUS"syslog");
3837 /* not a panic, non-privileged users should not be able to spam paniclog */
3839 "exim: you lack sufficient privilege to specify syslog process name\n");
3840 return EXIT_FAILURE;
3844 /* Paranoia check of maximum lengths of certain strings. There is a check
3845 on the length of the log file path in log.c, which will come into effect
3846 if there are any calls to write the log earlier than this. However, if we
3847 get this far but the string is very long, it is better to stop now than to
3848 carry on and (e.g.) receive a message and then have to collapse. The call to
3849 log_write() from here will cause the ultimate panic collapse if the complete
3850 file name exceeds the buffer length. */
3852 if (Ustrlen(log_file_path) > 200)
3853 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3854 "log_file_path is longer than 200 chars: aborting");
3856 if (Ustrlen(pid_file_path) > 200)
3857 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3858 "pid_file_path is longer than 200 chars: aborting");
3860 if (Ustrlen(spool_directory) > 200)
3861 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3862 "spool_directory is longer than 200 chars: aborting");
3864 /* Length check on the process name given to syslog for its TAG field,
3865 which is only permitted to be 32 characters or less. See RFC 3164. */
3867 if (Ustrlen(syslog_processname) > 32)
3868 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3869 "syslog_processname is longer than 32 chars: aborting");
3875 log_write(0, LOG_MAIN, "%s", log_oneline);
3876 return EXIT_SUCCESS;
3879 return EXIT_FAILURE;
3882 /* In some operating systems, the environment variable TMPDIR controls where
3883 temporary files are created; Exim doesn't use these (apart from when delivering
3884 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3885 If TMPDIR is found in the environment, reset it to the value defined in the
3886 TMPDIR macro, if this macro is defined. */
3891 for (p = USS environ; *p != NULL; p++)
3893 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3894 Ustrcmp(*p+7, TMPDIR) != 0)
3896 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3897 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3899 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3905 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3906 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3907 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3908 called by a user who has set the TZ variable. This then affects the timestamps
3909 in log files and in Received: headers, and any created Date: header lines. The
3910 required timezone is settable in the configuration file, so nothing can be done
3911 about this earlier - but hopefully nothing will normally be logged earlier than
3912 this. We have to make a new environment if TZ is wrong, but don't bother if
3913 timestamps_utc is set, because then all times are in UTC anyway. */
3915 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3917 timestamps_utc = TRUE;
3921 uschar *envtz = US getenv("TZ");
3922 if ((envtz == NULL && timezone_string != NULL) ||
3924 (timezone_string == NULL ||
3925 Ustrcmp(timezone_string, envtz) != 0)))
3927 uschar **p = USS environ;
3931 while (*p++ != NULL) count++;
3932 if (envtz == NULL) count++;
3933 newp = new = malloc(sizeof(uschar *) * (count + 1));
3934 for (p = USS environ; *p != NULL; p++)
3936 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3939 if (timezone_string != NULL)
3941 *newp = malloc(Ustrlen(timezone_string) + 4);
3942 sprintf(CS *newp++, "TZ=%s", timezone_string);
3947 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3948 tod_stamp(tod_log));
3952 /* Handle the case when we have removed the setuid privilege because of -C or
3953 -D. This means that the caller of Exim was not root.
3955 There is a problem if we were running as the Exim user. The sysadmin may
3956 expect this case to retain privilege because "the binary was called by the
3957 Exim user", but it hasn't, because either the -D option set macros, or the
3958 -C option set a non-trusted configuration file. There are two possibilities:
3960 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3961 to do message deliveries. Thus, the fact that it is running as a
3962 non-privileged user is plausible, and might be wanted in some special
3963 configurations. However, really_exim will have been set false when
3964 privilege was dropped, to stop Exim trying to write to its normal log
3965 files. Therefore, re-enable normal log processing, assuming the sysadmin
3966 has set up the log directory correctly.
3968 (2) If deliver_drop_privilege is not set, the configuration won't work as
3969 apparently intended, and so we log a panic message. In order to retain
3970 root for -C or -D, the caller must either be root or be invoking a
3971 trusted configuration file (when deliver_drop_privilege is false). */
3973 if (removed_privilege && (!trusted_config || macros != NULL) &&
3974 real_uid == exim_uid)
3976 if (deliver_drop_privilege)
3977 really_exim = TRUE; /* let logging work normally */
3979 log_write(0, LOG_MAIN|LOG_PANIC,
3980 "exim user lost privilege for using %s option",
3981 trusted_config? "-D" : "-C");
3984 /* Start up Perl interpreter if Perl support is configured and there is a
3985 perl_startup option, and the configuration or the command line specifies
3986 initializing starting. Note that the global variables are actually called
3987 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3990 if (perl_start_option != 0)
3991 opt_perl_at_start = (perl_start_option > 0);
3992 if (opt_perl_at_start && opt_perl_startup != NULL)
3995 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3996 errstr = init_perl(opt_perl_startup);
3999 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4000 return EXIT_FAILURE;
4002 opt_perl_started = TRUE;
4004 #endif /* EXIM_PERL */
4006 /* Log the arguments of the call if the configuration file said so. This is
4007 a debugging feature for finding out what arguments certain MUAs actually use.
4008 Don't attempt it if logging is disabled, or if listing variables or if
4009 verifying/testing addresses or expansions. */
4011 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4012 && really_exim && !list_options && !checking)
4015 uschar *p = big_buffer;
4017 Ustrcpy(p, "cwd= (failed)");
4018 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
4020 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4022 for (i = 0; i < argc; i++)
4024 int len = Ustrlen(argv[i]);
4025 const uschar *printing;
4027 if (p + len + 8 >= big_buffer + big_buffer_size)
4030 log_write(0, LOG_MAIN, "%s", big_buffer);
4031 Ustrcpy(big_buffer, "...");
4034 printing = string_printing(argv[i]);
4035 if (printing[0] == 0) quote = US"\""; else
4037 const uschar *pp = printing;
4039 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4041 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4042 (p - big_buffer) - 4), printing, quote);
4046 if (LOGGING(arguments))
4047 log_write(0, LOG_MAIN, "%s", big_buffer);
4049 debug_printf("%s\n", big_buffer);
4052 /* Set the working directory to be the top-level spool directory. We don't rely
4053 on this in the code, which always uses fully qualified names, but it's useful
4054 for core dumps etc. Don't complain if it fails - the spool directory might not
4055 be generally accessible and calls with the -C option (and others) have lost
4056 privilege by now. Before the chdir, we try to ensure that the directory exists.
4059 if (Uchdir(spool_directory) != 0)
4062 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4063 dummy = /* quieten compiler */ Uchdir(spool_directory);
4066 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4067 alias file. Exim doesn't have such a concept, but this call is screwed into
4068 Sun's YP makefiles. Handle this by calling a configured script, as the real
4069 user who called Exim. The -oA option can be used to pass an argument to the
4074 (void)fclose(config_file);
4075 if (bi_command != NULL)
4079 argv[i++] = bi_command;
4080 if (alias_arg != NULL) argv[i++] = alias_arg;
4083 setgroups(group_count, group_list);
4084 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4086 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4087 (argv[1] == NULL)? US"" : argv[1]);
4089 execv(CS argv[0], (char *const *)argv);
4090 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4095 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4100 /* We moved the admin/trusted check to be immediately after reading the
4101 configuration file. We leave these prints here to ensure that syslog setup,
4102 logfile setup, and so on has already happened. */
4104 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4105 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4107 /* Only an admin user may start the daemon or force a queue run in the default
4108 configuration, but the queue run restriction can be relaxed. Only an admin
4109 user may request that a message be returned to its sender forthwith. Only an
4110 admin user may specify a debug level greater than D_v (because it might show
4111 passwords, etc. in lookup queries). Only an admin user may request a queue
4112 count. Only an admin user can use the test interface to scan for email
4113 (because Exim will be in the spool dir and able to look at mails). */
4117 BOOL debugset = (debug_selector & ~D_v) != 0;
4118 if (deliver_give_up || daemon_listen || malware_test_file ||
4119 (count_queue && queue_list_requires_admin) ||
4120 (list_queue && queue_list_requires_admin) ||
4121 (queue_interval >= 0 && prod_requires_admin) ||
4122 (debugset && !running_in_test_harness))
4124 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4129 /* If the real user is not root or the exim uid, the argument for passing
4130 in an open TCP/IP connection for another message is not permitted, nor is
4131 running with the -N option for any delivery action, unless this call to exim is
4132 one that supplied an input message, or we are using a patched exim for
4133 regression testing. */
4135 if (real_uid != root_uid && real_uid != exim_uid &&
4136 (continue_hostname != NULL ||
4138 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4139 )) && !running_in_test_harness)
4141 fprintf(stderr, "exim: Permission denied\n");
4142 return EXIT_FAILURE;
4145 /* If the caller is not trusted, certain arguments are ignored when running for
4146 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4147 Note that authority for performing certain actions on messages is tested in the
4148 queue_action() function. */
4150 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4152 sender_host_name = sender_host_address = interface_address =
4153 sender_ident = received_protocol = NULL;
4154 sender_host_port = interface_port = 0;
4155 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4158 /* If a sender host address is set, extract the optional port number off the
4159 end of it and check its syntax. Do the same thing for the interface address.
4160 Exim exits if the syntax is bad. */
4164 if (sender_host_address != NULL)
4165 sender_host_port = check_port(sender_host_address);
4166 if (interface_address != NULL)
4167 interface_port = check_port(interface_address);
4170 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4175 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4176 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4180 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4181 return EXIT_FAILURE;
4185 /* If an SMTP message is being received check to see if the standard input is a
4186 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4187 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4192 union sockaddr_46 inetd_sock;
4193 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4194 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4196 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4197 if (family == AF_INET || family == AF_INET6)
4199 union sockaddr_46 interface_sock;
4200 size = sizeof(interface_sock);
4202 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4203 interface_address = host_ntoa(-1, &interface_sock, NULL,
4206 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4208 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4211 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4212 NULL, &sender_host_port);
4213 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4214 "inetd is not supported when mua_wrapper is set");
4219 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4220 return EXIT_FAILURE;
4226 /* If the load average is going to be needed while receiving a message, get it
4227 now for those OS that require the first call to os_getloadavg() to be done as
4228 root. There will be further calls later for each message received. */
4230 #ifdef LOAD_AVG_NEEDS_ROOT
4231 if (receiving_message &&
4232 (queue_only_load >= 0 ||
4233 (is_inetd && smtp_load_reserve >= 0)
4236 load_average = OS_GETLOADAVG();
4240 /* The queue_only configuration option can be overridden by -odx on the command
4241 line, except that if queue_only_override is false, queue_only cannot be unset
4242 from the command line. */
4244 if (queue_only_set && (queue_only_override || arg_queue_only))
4245 queue_only = arg_queue_only;
4247 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4250 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4251 if (arg_smtp_receive_timeout >= 0)
4252 smtp_receive_timeout = arg_smtp_receive_timeout;
4254 /* If Exim was started with root privilege, unless we have already removed the
4255 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4256 except when starting the daemon or doing some kind of delivery or address
4257 testing (-bt). These are the only cases when root need to be retained. We run
4258 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4259 retained only for starting the daemon. We always do the initgroups() in this
4260 situation (controlled by the TRUE below), in order to be as close as possible
4261 to the state Exim usually runs in. */
4263 if (!unprivileged && /* originally had root AND */
4264 !removed_privilege && /* still got root AND */
4265 !daemon_listen && /* not starting the daemon */
4266 queue_interval <= 0 && /* (either kind of daemon) */
4268 deliver_drop_privilege || /* requested unprivileged */
4270 queue_interval < 0 && /* not running the queue */
4271 (msg_action_arg < 0 || /* and */
4272 msg_action != MSG_DELIVER) && /* not delivering and */
4273 (!checking || !address_test_mode) /* not address checking */
4277 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4280 /* When we are retaining a privileged uid, we still change to the exim gid. */
4285 rv = setgid(exim_gid);
4286 /* Impact of failure is that some stuff might end up with an incorrect group.
4287 We track this for failures from root, since any attempt to change privilege
4288 by root should succeed and failures should be examined. For non-root,
4289 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4290 no need to complain then. */
4293 if (!(unprivileged || removed_privilege))
4296 "exim: changing group failed: %s\n", strerror(errno));
4300 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4301 (long int)exim_gid, strerror(errno));
4305 /* Handle a request to scan a file for malware */
4306 if (malware_test_file)
4308 #ifdef WITH_CONTENT_SCAN
4310 set_process_info("scanning file for malware");
4311 result = malware_in_file(malware_test_file);
4314 printf("No malware found.\n");
4319 printf("Malware lookup returned non-okay/fail: %d\n", result);
4323 printf("Malware found: %s\n", malware_name);
4325 printf("Malware scan detected malware of unknown name.\n");
4327 printf("Malware scanning not enabled at compile time.\n");
4332 /* Handle a request to list the delivery queue */
4336 set_process_info("listing the queue");
4337 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4341 /* Handle a request to count the delivery queue */
4345 set_process_info("counting the queue");
4350 /* Handle actions on specific messages, except for the force delivery and
4351 message load actions, which are done below. Some actions take a whole list of
4352 message ids, which are known to continue up to the end of the arguments. Others
4353 take a single message id and then operate on the recipients list. */
4355 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4357 int yield = EXIT_SUCCESS;
4358 set_process_info("acting on specified messages");
4360 if (!one_msg_action)
4362 for (i = msg_action_arg; i < argc; i++)
4363 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4364 yield = EXIT_FAILURE;
4367 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4368 recipients_arg)) yield = EXIT_FAILURE;
4372 /* We used to set up here to skip reading the ACL section, on
4373 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4374 Now, since the intro of the ${acl } expansion, ACL definitions may be
4375 needed in transports so we lost the optimisation. */
4379 /* The configuration data will have been read into POOL_PERM because we won't
4380 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4381 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4382 configuration were read into POOL_MAIN, because we don't do any resets till
4383 later on. However, it seems right, and it does ensure that both pools get used.
4386 store_pool = POOL_MAIN;
4388 /* Handle the -brt option. This is for checking out retry configurations.
4389 The next three arguments are a domain name or a complete address, and
4390 optionally two error numbers. All it does is to call the function that
4391 scans the retry configuration data. */
4393 if (test_retry_arg >= 0)
4395 retry_config *yield;
4396 int basic_errno = 0;
4400 if (test_retry_arg >= argc)
4402 printf("-brt needs a domain or address argument\n");
4403 exim_exit(EXIT_FAILURE);
4405 s1 = argv[test_retry_arg++];
4408 /* If the first argument contains no @ and no . it might be a local user
4409 or it might be a single-component name. Treat as a domain. */
4411 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4413 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4414 "being \ntreated as a one-component domain, not as a local part.\n\n",
4418 /* There may be an optional second domain arg. */
4420 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4421 s2 = argv[test_retry_arg++];
4423 /* The final arg is an error name */
4425 if (test_retry_arg < argc)
4427 uschar *ss = argv[test_retry_arg];
4429 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4432 printf("%s\n", CS error);
4433 return EXIT_FAILURE;
4436 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4437 code > 100 as an error is for matching codes to the decade. Turn them into
4438 a real error code, off the decade. */
4440 if (basic_errno == ERRNO_MAIL4XX ||
4441 basic_errno == ERRNO_RCPT4XX ||
4442 basic_errno == ERRNO_DATA4XX)
4444 int code = (more_errno >> 8) & 255;
4446 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4447 else if (code > 100)
4448 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4452 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4453 if (yield == NULL) printf("No retry information found\n"); else
4456 more_errno = yield->more_errno;
4457 printf("Retry rule: %s ", yield->pattern);
4459 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4461 printf("quota%s%s ",
4462 (more_errno > 0)? "_" : "",
4463 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4465 else if (yield->basic_errno == ECONNREFUSED)
4467 printf("refused%s%s ",
4468 (more_errno > 0)? "_" : "",
4469 (more_errno == 'M')? "MX" :
4470 (more_errno == 'A')? "A" : "");
4472 else if (yield->basic_errno == ETIMEDOUT)
4475 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4477 if (more_errno != 0) printf("_%s",
4478 (more_errno == 'M')? "MX" : "A");
4481 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4482 printf("auth_failed ");
4485 for (r = yield->rules; r != NULL; r = r->next)
4487 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4488 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4494 printf(",%d.", x/1000);
4508 exim_exit(EXIT_SUCCESS);
4511 /* Handle a request to list one or more configuration options */
4512 /* If -n was set, we suppress some information */
4516 set_process_info("listing variables");
4517 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4518 else for (i = recipients_arg; i < argc; i++)
4521 (Ustrcmp(argv[i], "router") == 0 ||
4522 Ustrcmp(argv[i], "transport") == 0 ||
4523 Ustrcmp(argv[i], "authenticator") == 0 ||
4524 Ustrcmp(argv[i], "macro") == 0))
4526 readconf_print(argv[i+1], argv[i], flag_n);
4529 else readconf_print(argv[i], NULL, flag_n);
4531 exim_exit(EXIT_SUCCESS);
4535 /* Handle a request to deliver one or more messages that are already on the
4536 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4537 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4539 Delivery of specific messages is typically used for a small number when
4540 prodding by hand (when the option forced_delivery will be set) or when
4541 re-execing to regain root privilege. Each message delivery must happen in a
4542 separate process, so we fork a process for each one, and run them sequentially
4543 so that debugging output doesn't get intertwined, and to avoid spawning too
4544 many processes if a long list is given. However, don't fork for the last one;
4545 this saves a process in the common case when Exim is called to deliver just one
4548 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4550 if (prod_requires_admin && !admin_user)
4552 fprintf(stderr, "exim: Permission denied\n");
4553 exim_exit(EXIT_FAILURE);
4555 set_process_info("delivering specified messages");
4556 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4557 for (i = msg_action_arg; i < argc; i++)
4562 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4563 else if ((pid = fork()) == 0)
4565 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4566 _exit(EXIT_SUCCESS);
4570 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4572 exim_exit(EXIT_FAILURE);
4576 exim_exit(EXIT_SUCCESS);
4580 /* If only a single queue run is requested, without SMTP listening, we can just
4581 turn into a queue runner, with an optional starting message id. */
4583 if (queue_interval == 0 && !daemon_listen)
4585 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4586 (start_queue_run_id == NULL)? US"" : US" starting at ",
4587 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4588 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4589 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4590 set_process_info("running the queue (single queue run)");
4591 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4592 exim_exit(EXIT_SUCCESS);
4596 /* Find the login name of the real user running this process. This is always
4597 needed when receiving a message, because it is written into the spool file. It
4598 may also be used to construct a from: or a sender: header, and in this case we
4599 need the user's full name as well, so save a copy of it, checked for RFC822
4600 syntax and munged if necessary, if it hasn't previously been set by the -F
4601 argument. We may try to get the passwd entry more than once, in case NIS or
4602 other delays are in evidence. Save the home directory for use in filter testing
4607 if ((pw = getpwuid(real_uid)) != NULL)
4609 originator_login = string_copy(US pw->pw_name);
4610 originator_home = string_copy(US pw->pw_dir);
4612 /* If user name has not been set by -F, set it from the passwd entry
4613 unless -f has been used to set the sender address by a trusted user. */
4615 if (originator_name == NULL)
4617 if (sender_address == NULL ||
4618 (!trusted_caller && filter_test == FTEST_NONE))
4620 uschar *name = US pw->pw_gecos;
4621 uschar *amp = Ustrchr(name, '&');
4624 /* Most Unix specify that a '&' character in the gecos field is
4625 replaced by a copy of the login name, and some even specify that
4626 the first character should be upper cased, so that's what we do. */
4631 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4632 amp - name, name, &loffset, originator_login, amp + 1);
4633 buffer[loffset] = toupper(buffer[loffset]);
4637 /* If a pattern for matching the gecos field was supplied, apply
4638 it and then expand the name string. */
4640 if (gecos_pattern != NULL && gecos_name != NULL)
4643 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4645 if (regex_match_and_setup(re, name, 0, -1))
4647 uschar *new_name = expand_string(gecos_name);
4649 if (new_name != NULL)
4651 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4652 "gecos field \"%s\"\n", new_name, name);
4655 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4656 "\"%s\": %s\n", gecos_name, expand_string_message);
4658 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4659 "gecos field \"%s\"\n", gecos_pattern, name);
4660 store_free((void *)re);
4662 originator_name = string_copy(name);
4665 /* A trusted caller has used -f but not -F */
4667 else originator_name = US"";
4670 /* Break the retry loop */
4675 if (++i > finduser_retries) break;
4679 /* If we cannot get a user login, log the incident and give up, unless the
4680 configuration specifies something to use. When running in the test harness,
4681 any setting of unknown_login overrides the actual name. */
4683 if (originator_login == NULL || running_in_test_harness)
4685 if (unknown_login != NULL)
4687 originator_login = expand_string(unknown_login);
4688 if (originator_name == NULL && unknown_username != NULL)
4689 originator_name = expand_string(unknown_username);
4690 if (originator_name == NULL) originator_name = US"";
4692 if (originator_login == NULL)
4693 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4697 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4700 originator_name = string_copy(parse_fix_phrase(originator_name,
4701 Ustrlen(originator_name), big_buffer, big_buffer_size));
4703 /* If a message is created by this call of Exim, the uid/gid of its originator
4704 are those of the caller. These values are overridden if an existing message is
4705 read in from the spool. */
4707 originator_uid = real_uid;
4708 originator_gid = real_gid;
4710 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4711 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4713 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4714 returns. We leave this till here so that the originator_ fields are available
4715 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4718 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4722 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4723 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4724 "mua_wrapper is set");
4729 /* If the sender ident has not been set (by a trusted caller) set it to
4730 the caller. This will get overwritten below for an inetd call. If a trusted
4731 caller has set it empty, unset it. */
4733 if (sender_ident == NULL) sender_ident = originator_login;
4734 else if (sender_ident[0] == 0) sender_ident = NULL;
4736 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4737 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4738 originator_* variables set. */
4740 if (test_rewrite_arg >= 0)
4742 really_exim = FALSE;
4743 if (test_rewrite_arg >= argc)
4745 printf("-brw needs an address argument\n");
4746 exim_exit(EXIT_FAILURE);
4748 rewrite_test(argv[test_rewrite_arg]);
4749 exim_exit(EXIT_SUCCESS);
4752 /* A locally-supplied message is considered to be coming from a local user
4753 unless a trusted caller supplies a sender address with -f, or is passing in the
4754 message via SMTP (inetd invocation or otherwise). */
4756 if ((sender_address == NULL && !smtp_input) ||
4757 (!trusted_caller && filter_test == FTEST_NONE))
4759 sender_local = TRUE;
4761 /* A trusted caller can supply authenticated_sender and authenticated_id
4762 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4763 defaults except when host checking. */
4765 if (authenticated_sender == NULL && !host_checking)
4766 authenticated_sender = string_sprintf("%s@%s", originator_login,
4767 qualify_domain_sender);
4768 if (authenticated_id == NULL && !host_checking)
4769 authenticated_id = originator_login;
4772 /* Trusted callers are always permitted to specify the sender address.
4773 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4774 is specified is the empty address. However, if a trusted caller does not
4775 specify a sender address for SMTP input, we leave sender_address unset. This
4776 causes the MAIL commands to be honoured. */
4778 if ((!smtp_input && sender_address == NULL) ||
4779 !receive_check_set_sender(sender_address))
4781 /* Either the caller is not permitted to set a general sender, or this is
4782 non-SMTP input and the trusted caller has not set a sender. If there is no
4783 sender, or if a sender other than <> is set, override with the originator's
4784 login (which will get qualified below), except when checking things. */
4786 if (sender_address == NULL /* No sender_address set */
4788 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4789 !checking && /* Not running tests, AND */
4790 filter_test == FTEST_NONE)) /* Not testing a filter */
4792 sender_address = originator_login;
4793 sender_address_forced = FALSE;
4794 sender_address_domain = 0;
4798 /* Remember whether an untrusted caller set the sender address */
4800 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4802 /* Ensure that the sender address is fully qualified unless it is the empty
4803 address, which indicates an error message, or doesn't exist (root caller, smtp
4804 interface, no -f argument). */
4806 if (sender_address != NULL && sender_address[0] != 0 &&
4807 sender_address_domain == 0)
4808 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4809 qualify_domain_sender);
4811 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4813 /* Handle a request to verify a list of addresses, or test them for delivery.
4814 This must follow the setting of the sender address, since routers can be
4815 predicated upon the sender. If no arguments are given, read addresses from
4816 stdin. Set debug_level to at least D_v to get full output for address testing.
4819 if (verify_address_mode || address_test_mode)
4822 int flags = vopt_qualify;
4824 if (verify_address_mode)
4826 if (!verify_as_sender) flags |= vopt_is_recipient;
4827 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4832 flags |= vopt_is_recipient;
4833 debug_selector |= D_v;
4834 debug_file = stderr;
4835 debug_fd = fileno(debug_file);
4836 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4839 if (recipients_arg < argc)
4841 while (recipients_arg < argc)
4843 uschar *s = argv[recipients_arg++];
4846 BOOL finished = FALSE;
4847 uschar *ss = parse_find_address_end(s, FALSE);
4848 if (*ss == ',') *ss = 0; else finished = TRUE;
4849 test_address(s, flags, &exit_value);
4852 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4859 uschar *s = get_stdinput(NULL, NULL);
4860 if (s == NULL) break;
4861 test_address(s, flags, &exit_value);
4865 exim_exit(exit_value);
4868 /* Handle expansion checking. Either expand items on the command line, or read
4869 from stdin if there aren't any. If -Mset was specified, load the message so
4870 that its variables can be used, but restrict this facility to admin users.
4871 Otherwise, if -bem was used, read a message from stdin. */
4875 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4877 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4880 fprintf(stderr, "exim: permission denied\n");
4883 message_id = argv[msg_action_arg];
4884 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4885 if (!spool_open_datafile(message_id))
4886 printf ("Failed to load message datafile %s\n", message_id);
4887 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4888 printf ("Failed to load message %s\n", message_id);
4891 /* Read a test message from a file. We fudge it up to be on stdin, saving
4892 stdin itself for later reading of expansion strings. */
4894 else if (expansion_test_message != NULL)
4896 int save_stdin = dup(0);
4897 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4900 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4902 return EXIT_FAILURE;
4905 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4906 message_ended = END_NOTENDED;
4907 read_message_body(receive_msg(extract_recipients));
4908 message_linecount += body_linecount;
4909 (void)dup2(save_stdin, 0);
4910 (void)close(save_stdin);
4911 clearerr(stdin); /* Required by Darwin */
4914 /* Allow $recipients for this testing */
4916 enable_dollar_recipients = TRUE;
4918 /* Expand command line items */
4920 if (recipients_arg < argc)
4922 while (recipients_arg < argc)
4924 uschar *s = argv[recipients_arg++];
4925 uschar *ss = expand_string(s);
4926 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4927 else printf("%s\n", CS ss);
4935 char *(*fn_readline)(const char *) = NULL;
4936 void (*fn_addhist)(const char *) = NULL;
4939 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4945 uschar *source = get_stdinput(fn_readline, fn_addhist);
4946 if (source == NULL) break;
4947 ss = expand_string(source);
4949 printf ("Failed: %s\n", expand_string_message);
4950 else printf("%s\n", CS ss);
4954 if (dlhandle != NULL) dlclose(dlhandle);
4958 /* The data file will be open after -Mset */
4960 if (deliver_datafile >= 0)
4962 (void)close(deliver_datafile);
4963 deliver_datafile = -1;
4966 exim_exit(EXIT_SUCCESS);
4970 /* The active host name is normally the primary host name, but it can be varied
4971 for hosts that want to play several parts at once. We need to ensure that it is
4972 set for host checking, and for receiving messages. */
4974 smtp_active_hostname = primary_hostname;
4975 if (raw_active_hostname != NULL)
4977 uschar *nah = expand_string(raw_active_hostname);
4980 if (!expand_string_forcedfail)
4981 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4982 "(smtp_active_hostname): %s", raw_active_hostname,
4983 expand_string_message);
4985 else if (nah[0] != 0) smtp_active_hostname = nah;
4988 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4989 given IP address so that the blocking and relay configuration can be tested.
4990 Unless a sender_ident was set by -oMt, we discard it (the default is the
4991 caller's login name). An RFC 1413 call is made only if we are running in the
4992 test harness and an incoming interface and both ports are specified, because
4993 there is no TCP/IP call to find the ident for. */
5000 if (!sender_ident_set)
5002 sender_ident = NULL;
5003 if (running_in_test_harness && sender_host_port != 0 &&
5004 interface_address != NULL && interface_port != 0)
5005 verify_get_ident(1413);
5008 /* In case the given address is a non-canonical IPv6 address, canonicize
5009 it. The code works for both IPv4 and IPv6, as it happens. */
5011 size = host_aton(sender_host_address, x);
5012 sender_host_address = store_get(48); /* large enough for full IPv6 */
5013 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5015 /* Now set up for testing */
5017 host_build_sender_fullhost();
5021 sender_local = FALSE;
5022 sender_host_notsocket = TRUE;
5023 debug_file = stderr;
5024 debug_fd = fileno(debug_file);
5025 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5026 "**** but without any ident (RFC 1413) callback.\n"
5027 "**** This is not for real!\n\n",
5028 sender_host_address);
5030 if (verify_check_host(&hosts_connection_nolog) == OK)
5031 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5032 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5034 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5035 because a log line has already been written for all its failure exists
5036 (usually "connection refused: <reason>") and writing another one is
5037 unnecessary clutter. */
5039 if (smtp_start_session())
5041 reset_point = store_get(0);
5044 store_reset(reset_point);
5045 if (smtp_setup_msg() <= 0) break;
5046 if (!receive_msg(FALSE)) break;
5050 exim_exit(EXIT_SUCCESS);
5054 /* Arrange for message reception if recipients or SMTP were specified;
5055 otherwise complain unless a version print (-bV) happened or this is a filter
5056 verification test or info dump.
5057 In the former case, show the configuration file name. */
5059 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5061 if (version_printed)
5063 printf("Configuration file is %s\n", config_main_filename);
5064 return EXIT_SUCCESS;
5067 if (info_flag != CMDINFO_NONE)
5069 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5070 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5073 if (filter_test == FTEST_NONE)
5074 exim_usage(called_as);
5078 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5079 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5080 that we are not called from inetd, because that is rejected above. The
5081 following configuration settings are forced here:
5083 (1) Synchronous delivery (-odi)
5084 (2) Errors to stderr (-oep == -oeq)
5085 (3) No parallel remote delivery
5086 (4) Unprivileged delivery
5088 We don't force overall queueing options because there are several of them;
5089 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5090 to override any SMTP queueing. */
5094 synchronous_delivery = TRUE;
5095 arg_error_handling = ERRORS_STDERR;
5096 remote_max_parallel = 1;
5097 deliver_drop_privilege = TRUE;
5099 queue_smtp_domains = NULL;
5100 #ifdef EXPERIMENTAL_INTERNATIONAL
5101 message_utf8_downconvert = -1; /* convert-if-needed */
5106 /* Prepare to accept one or more new messages on the standard input. When a
5107 message has been read, its id is returned in message_id[]. If doing immediate
5108 delivery, we fork a delivery process for each received message, except for the
5109 last one, where we can save a process switch.
5111 It is only in non-smtp mode that error_handling is allowed to be changed from
5112 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5113 sendmail error modes other than -oem ever actually used? Later: yes.) */
5115 if (!smtp_input) error_handling = arg_error_handling;
5117 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5118 logging being sent down the socket and make an identd call to get the
5123 (void)fclose(stderr);
5124 exim_nullstd(); /* Re-open to /dev/null */
5125 verify_get_ident(IDENT_PORT);
5126 host_build_sender_fullhost();
5127 set_process_info("handling incoming connection from %s via inetd",
5131 /* If the sender host address has been set, build sender_fullhost if it hasn't
5132 already been done (which it will have been for inetd). This caters for the
5133 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5134 so that the test for IP options is skipped for -bs input. */
5136 if (sender_host_address != NULL && sender_fullhost == NULL)
5138 host_build_sender_fullhost();
5139 set_process_info("handling incoming connection from %s via -oMa",
5141 sender_host_notsocket = TRUE;
5144 /* Otherwise, set the sender host as unknown except for inetd calls. This
5145 prevents host checking in the case of -bs not from inetd and also for -bS. */
5147 else if (!is_inetd) sender_host_unknown = TRUE;
5149 /* If stdout does not exist, then dup stdin to stdout. This can happen
5150 if exim is started from inetd. In this case fd 0 will be set to the socket,
5151 but fd 1 will not be set. This also happens for passed SMTP channels. */
5153 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5155 /* Set up the incoming protocol name and the state of the program. Root is
5156 allowed to force received protocol via the -oMr option above. If we have come
5157 via inetd, the process info has already been set up. We don't set
5158 received_protocol here for smtp input, as it varies according to
5159 batch/HELO/EHLO/AUTH/TLS. */
5163 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5164 smtp_batched_input? "batched " : "",
5165 (sender_address!= NULL)? sender_address : originator_login);
5169 if (received_protocol == NULL)
5170 received_protocol = string_sprintf("local%s", called_as);
5171 set_process_info("accepting a local non-SMTP message from <%s>",
5175 /* Initialize the session_local_queue-only flag (this will be ignored if
5176 mua_wrapper is set) */
5179 session_local_queue_only = queue_only;
5181 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5182 the spool if so configured. On failure, we must not attempt to send an error
5183 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5184 error code is given.) */
5186 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5188 fprintf(stderr, "exim: insufficient disk space\n");
5189 return EXIT_FAILURE;
5192 /* If this is smtp input of any kind, real or batched, handle the start of the
5195 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5196 because a log line has already been written for all its failure exists
5197 (usually "connection refused: <reason>") and writing another one is
5198 unnecessary clutter. */
5204 if (verify_check_host(&hosts_connection_nolog) == OK)
5205 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5206 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5207 if (!smtp_start_session())
5210 exim_exit(EXIT_SUCCESS);
5214 /* Otherwise, set up the input size limit here. */
5218 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5219 if (expand_string_message != NULL)
5221 if (thismessage_size_limit == -1)
5222 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5223 "message_size_limit: %s", expand_string_message);
5225 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5226 "message_size_limit: %s", expand_string_message);
5230 /* Loop for several messages when reading SMTP input. If we fork any child
5231 processes, we don't want to wait for them unless synchronous delivery is
5232 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5233 same as SIG_DFL, despite the fact that documentation often lists the default as
5234 "ignore". This is a confusing area. This is what I know:
5236 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5237 processes that complete simply to go away without ever becoming defunct. You
5238 can't then wait for them - but we don't want to wait for them in the
5239 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5240 happen for all OS (e.g. *BSD is different).
5242 But that's not the end of the story. Some (many? all?) systems have the
5243 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5244 has by default, so it seems that the difference is merely one of default
5245 (compare restarting vs non-restarting signals).
5247 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5248 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5249 of the loop below. Paranoia rules.
5251 February 2003: That's *still* not the end of the story. There are now versions
5252 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5253 process then calls waitpid(), a grumble is written to the system log, because
5254 this is logically inconsistent. In other words, it doesn't like the paranoia.
5255 As a consequenc of this, the waitpid() below is now excluded if we are sure
5256 that SIG_IGN works. */
5258 if (!synchronous_delivery)
5261 struct sigaction act;
5262 act.sa_handler = SIG_IGN;
5263 sigemptyset(&(act.sa_mask));
5264 act.sa_flags = SA_NOCLDWAIT;
5265 sigaction(SIGCHLD, &act, NULL);
5267 signal(SIGCHLD, SIG_IGN);
5271 /* Save the current store pool point, for resetting at the start of
5272 each message, and save the real sender address, if any. */
5274 reset_point = store_get(0);
5275 real_sender_address = sender_address;
5277 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5278 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5283 store_reset(reset_point);
5286 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5287 input and build the recipients list, before calling receive_msg() to read the
5288 message proper. Whatever sender address is given in the SMTP transaction is
5289 often ignored for local senders - we use the actual sender, which is normally
5290 either the underlying user running this process or a -f argument provided by
5291 a trusted caller. It is saved in real_sender_address. The test for whether to
5292 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5297 if ((rc = smtp_setup_msg()) > 0)
5299 if (real_sender_address != NULL &&
5300 !receive_check_set_sender(sender_address))
5302 sender_address = raw_sender = real_sender_address;
5303 sender_address_unrewritten = NULL;
5306 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5307 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5308 the very end. The result of the ACL is ignored (as for other non-SMTP
5309 messages). It is run for its potential side effects. */
5311 if (smtp_batched_input && acl_not_smtp_start != NULL)
5313 uschar *user_msg, *log_msg;
5314 enable_dollar_recipients = TRUE;
5315 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5316 &user_msg, &log_msg);
5317 enable_dollar_recipients = FALSE;
5320 /* Now get the data for the message */
5322 more = receive_msg(extract_recipients);
5323 if (message_id[0] == 0)
5326 smtp_log_no_mail(); /* Log no mail if configured */
5327 exim_exit(EXIT_FAILURE);
5332 smtp_log_no_mail(); /* Log no mail if configured */
5333 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5337 /* In the non-SMTP case, we have all the information from the command
5338 line, but must process it in case it is in the more general RFC822
5339 format, and in any case, to detect syntax errors. Also, it appears that
5340 the use of comma-separated lists as single arguments is common, so we
5341 had better support them. */
5347 int count = argc - recipients_arg;
5348 uschar **list = argv + recipients_arg;
5350 /* These options cannot be changed dynamically for non-SMTP messages */
5352 active_local_sender_retain = local_sender_retain;
5353 active_local_from_check = local_from_check;
5355 /* Save before any rewriting */
5357 raw_sender = string_copy(sender_address);
5359 /* Loop for each argument */
5361 for (i = 0; i < count; i++)
5363 int start, end, domain;
5365 uschar *s = list[i];
5367 /* Loop for each comma-separated address */
5371 BOOL finished = FALSE;
5373 uschar *ss = parse_find_address_end(s, FALSE);
5375 if (*ss == ',') *ss = 0; else finished = TRUE;
5377 /* Check max recipients - if -t was used, these aren't recipients */
5379 if (recipients_max > 0 && ++rcount > recipients_max &&
5380 !extract_recipients)
5381 if (error_handling == ERRORS_STDERR)
5383 fprintf(stderr, "exim: too many recipients\n");
5384 exim_exit(EXIT_FAILURE);
5389 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5390 errors_sender_rc : EXIT_FAILURE;
5393 #ifdef EXPERIMENTAL_INTERNATIONAL
5395 BOOL b = allow_utf8_domains;
5396 allow_utf8_domains = TRUE;
5399 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5401 #ifdef EXPERIMENTAL_INTERNATIONAL
5402 if (string_is_utf8(recipient))
5403 message_smtputf8 = TRUE;
5405 allow_utf8_domains = b;
5408 if (domain == 0 && !allow_unqualified_recipient)
5411 errmess = US"unqualified recipient address not allowed";
5414 if (recipient == NULL)
5416 if (error_handling == ERRORS_STDERR)
5418 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5419 string_printing(list[i]), errmess);
5420 exim_exit(EXIT_FAILURE);
5426 eblock.text1 = string_printing(list[i]);
5427 eblock.text2 = errmess;
5429 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5430 errors_sender_rc : EXIT_FAILURE;
5434 receive_add_recipient(recipient, -1);
5437 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5441 /* Show the recipients when debugging */
5446 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5447 if (recipients_list != NULL)
5449 debug_printf("Recipients:\n");
5450 for (i = 0; i < recipients_count; i++)
5451 debug_printf(" %s\n", recipients_list[i].address);
5455 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5456 ignored; rejecting here would just add complication, and it can just as
5457 well be done later. Allow $recipients to be visible in the ACL. */
5459 if (acl_not_smtp_start != NULL)
5461 uschar *user_msg, *log_msg;
5462 enable_dollar_recipients = TRUE;
5463 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5464 &user_msg, &log_msg);
5465 enable_dollar_recipients = FALSE;
5468 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5469 will just read the headers for the message, and not write anything onto the
5472 message_ended = END_NOTENDED;
5473 more = receive_msg(extract_recipients);
5475 /* more is always FALSE here (not SMTP message) when reading a message
5476 for real; when reading the headers of a message for filter testing,
5477 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5479 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5480 } /* Non-SMTP message reception */
5482 /* If this is a filter testing run, there are headers in store, but
5483 no message on the spool. Run the filtering code in testing mode, setting
5484 the domain to the qualify domain and the local part to the current user,
5485 unless they have been set by options. The prefix and suffix are left unset
5486 unless specified. The the return path is set to to the sender unless it has
5487 already been set from a return-path header in the message. */
5489 if (filter_test != FTEST_NONE)
5491 deliver_domain = (ftest_domain != NULL)?
5492 ftest_domain : qualify_domain_recipient;
5493 deliver_domain_orig = deliver_domain;
5494 deliver_localpart = (ftest_localpart != NULL)?
5495 ftest_localpart : originator_login;
5496 deliver_localpart_orig = deliver_localpart;
5497 deliver_localpart_prefix = ftest_prefix;
5498 deliver_localpart_suffix = ftest_suffix;
5499 deliver_home = originator_home;
5501 if (return_path == NULL)
5503 printf("Return-path copied from sender\n");
5504 return_path = string_copy(sender_address);
5507 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5508 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5510 receive_add_recipient(
5511 string_sprintf("%s%s%s@%s",
5512 (ftest_prefix == NULL)? US"" : ftest_prefix,
5514 (ftest_suffix == NULL)? US"" : ftest_suffix,
5515 deliver_domain), -1);
5517 printf("Recipient = %s\n", recipients_list[0].address);
5518 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5519 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5521 if (chdir("/")) /* Get away from wherever the user is running this from */
5523 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5524 exim_exit(EXIT_FAILURE);
5527 /* Now we run either a system filter test, or a user filter test, or both.
5528 In the latter case, headers added by the system filter will persist and be
5529 available to the user filter. We need to copy the filter variables
5532 if ((filter_test & FTEST_SYSTEM) != 0)
5534 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5535 exim_exit(EXIT_FAILURE);
5538 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5540 if ((filter_test & FTEST_USER) != 0)
5542 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5543 exim_exit(EXIT_FAILURE);
5546 exim_exit(EXIT_SUCCESS);
5549 /* Else act on the result of message reception. We should not get here unless
5550 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5551 will be TRUE. If it is not, check on the number of messages received in this
5554 if (!session_local_queue_only &&
5555 smtp_accept_queue_per_connection > 0 &&
5556 receive_messagecount > smtp_accept_queue_per_connection)
5558 session_local_queue_only = TRUE;
5559 queue_only_reason = 2;
5562 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5563 and queue_only_load is set, check that the load average is below it. If it is
5564 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5565 default), we put the whole session into queue_only mode. It then remains this
5566 way for any subsequent messages on the same SMTP connection. This is a
5567 deliberate choice; even though the load average may fall, it doesn't seem
5568 right to deliver later messages on the same call when not delivering earlier
5569 ones. However, there are odd cases where this is not wanted, so this can be
5570 changed by setting queue_only_load_latch false. */
5572 local_queue_only = session_local_queue_only;
5573 if (!local_queue_only && queue_only_load >= 0)
5575 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5576 if (local_queue_only)
5578 queue_only_reason = 3;
5579 if (queue_only_load_latch) session_local_queue_only = TRUE;
5583 /* If running as an MUA wrapper, all queueing options and freezing options
5587 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5589 /* Log the queueing here, when it will get a message id attached, but
5590 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5593 if (local_queue_only) switch(queue_only_reason)
5596 log_write(L_delay_delivery,
5597 LOG_MAIN, "no immediate delivery: more than %d messages "
5598 "received in one connection", smtp_accept_queue_per_connection);
5602 log_write(L_delay_delivery,
5603 LOG_MAIN, "no immediate delivery: load average %.2f",
5604 (double)load_average/1000.0);
5608 /* Else do the delivery unless the ACL or local_scan() called for queue only
5609 or froze the message. Always deliver in a separate process. A fork failure is
5610 not a disaster, as the delivery will eventually happen on a subsequent queue
5611 run. The search cache must be tidied before the fork, as the parent will
5612 do it before exiting. The child will trigger a lookup failure and
5613 thereby defer the delivery if it tries to use (for example) a cached ldap
5614 connection that the parent has called unbind on. */
5616 else if (!queue_only_policy && !deliver_freeze)
5621 if ((pid = fork()) == 0)
5624 close_unwanted(); /* Close unwanted file descriptors and TLS */
5625 exim_nullstd(); /* Ensure std{in,out,err} exist */
5627 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5628 mode, deliver_drop_privilege is forced TRUE). */
5630 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5632 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5634 /* Control does not return here. */
5637 /* No need to re-exec */
5639 rc = deliver_message(message_id, FALSE, FALSE);
5641 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5642 EXIT_SUCCESS : EXIT_FAILURE);
5647 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5648 "process: %s", strerror(errno));
5651 /* In the parent, wait if synchronous delivery is required. This will
5652 always be the case in MUA wrapper mode. */
5654 else if (synchronous_delivery)
5657 while (wait(&status) != pid);
5658 if ((status & 0x00ff) != 0)
5659 log_write(0, LOG_MAIN|LOG_PANIC,
5660 "process %d crashed with signal %d while delivering %s",
5661 (int)pid, status & 0x00ff, message_id);
5662 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5666 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5667 automatically reaps children (see comments above the loop), clear away any
5668 finished subprocesses here, in case there are lots of messages coming in
5669 from the same source. */
5671 #ifndef SIG_IGN_WORKS
5672 while (waitpid(-1, NULL, WNOHANG) > 0);
5676 exim_exit(EXIT_SUCCESS); /* Never returns */
5677 return 0; /* To stop compiler warning */