1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
193 /*************************************************
194 * Handler for SIGUSR1 *
195 *************************************************/
197 /* SIGUSR1 causes any exim process to write to the process log details of
198 what it is currently doing. It will only be used if the OS is capable of
199 setting up a handler that causes automatic restarting of any system call
200 that is in progress at the time.
202 This function takes care to be signal-safe.
204 Argument: the signal number (SIGUSR1)
209 usr1_handler(int sig)
213 os_restarting_signal(sig, usr1_handler);
215 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
217 /* If we are already running as the Exim user, try to create it in the
218 current process (assuming spool_directory exists). Otherwise, if we are
219 root, do the creation in an exim:exim subprocess. */
221 int euid = geteuid();
222 if (euid == exim_uid)
223 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
224 else if (euid == root_uid)
225 fd = log_create_as_exim(process_log_path);
228 /* If we are neither exim nor root, or if we failed to create the log file,
229 give up. There is not much useful we can do with errors, since we don't want
230 to disrupt whatever is going on outside the signal handler. */
234 (void)write(fd, process_info, process_info_len);
240 /*************************************************
242 *************************************************/
244 /* This handler is enabled most of the time that Exim is running. The handler
245 doesn't actually get used unless alarm() has been called to set a timer, to
246 place a time limit on a system call of some kind. When the handler is run, it
249 There are some other SIGALRM handlers that are used in special cases when more
250 than just a flag setting is required; for example, when reading a message's
251 input. These are normally set up in the code module that uses them, and the
252 SIGALRM handler is reset to this one afterwards.
254 Argument: the signal value (SIGALRM)
259 sigalrm_handler(int sig)
261 sig = sig; /* Keep picky compilers happy */
263 os_non_restarting_signal(SIGALRM, sigalrm_handler);
268 /*************************************************
269 * Sleep for a fractional time interval *
270 *************************************************/
272 /* This function is called by millisleep() and exim_wait_tick() to wait for a
273 period of time that may include a fraction of a second. The coding is somewhat
274 tedious. We do not expect setitimer() ever to fail, but if it does, the process
275 will wait for ever, so we panic in this instance. (There was a case of this
276 when a bug in a function that calls milliwait() caused it to pass invalid data.
277 That's when I added the check. :-)
279 We assume it to be not worth sleeping for under 100us; this value will
280 require revisiting as hardware advances. This avoids the issue of
281 a zero-valued timer setting meaning "never fire".
283 Argument: an itimerval structure containing the interval
288 milliwait(struct itimerval *itval)
291 sigset_t old_sigmask;
293 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
295 (void)sigemptyset(&sigmask); /* Empty mask */
296 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
297 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
298 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
299 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
300 "setitimer() failed: %s", strerror(errno));
301 (void)sigfillset(&sigmask); /* All signals */
302 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
303 (void)sigsuspend(&sigmask); /* Until SIGALRM */
304 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
310 /*************************************************
311 * Millisecond sleep function *
312 *************************************************/
314 /* The basic sleep() function has a granularity of 1 second, which is too rough
315 in some cases - for example, when using an increasing delay to slow down
318 Argument: number of millseconds
325 struct itimerval itval;
326 itval.it_interval.tv_sec = 0;
327 itval.it_interval.tv_usec = 0;
328 itval.it_value.tv_sec = msec/1000;
329 itval.it_value.tv_usec = (msec % 1000) * 1000;
335 /*************************************************
336 * Compare microsecond times *
337 *************************************************/
344 Returns: -1, 0, or +1
348 exim_tvcmp(struct timeval *t1, struct timeval *t2)
350 if (t1->tv_sec > t2->tv_sec) return +1;
351 if (t1->tv_sec < t2->tv_sec) return -1;
352 if (t1->tv_usec > t2->tv_usec) return +1;
353 if (t1->tv_usec < t2->tv_usec) return -1;
360 /*************************************************
361 * Clock tick wait function *
362 *************************************************/
364 /* Exim uses a time + a pid to generate a unique identifier in two places: its
365 message IDs, and in file names for maildir deliveries. Because some OS now
366 re-use pids within the same second, sub-second times are now being used.
367 However, for absolute certainty, we must ensure the clock has ticked before
368 allowing the relevant process to complete. At the time of implementation of
369 this code (February 2003), the speed of processors is such that the clock will
370 invariably have ticked already by the time a process has done its job. This
371 function prepares for the time when things are faster - and it also copes with
372 clocks that go backwards.
375 then_tv A timeval which was used to create uniqueness; its usec field
376 has been rounded down to the value of the resolution.
377 We want to be sure the current time is greater than this.
378 resolution The resolution that was used to divide the microseconds
379 (1 for maildir, larger for message ids)
385 exim_wait_tick(struct timeval *then_tv, int resolution)
387 struct timeval now_tv;
388 long int now_true_usec;
390 (void)gettimeofday(&now_tv, NULL);
391 now_true_usec = now_tv.tv_usec;
392 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
394 if (exim_tvcmp(&now_tv, then_tv) <= 0)
396 struct itimerval itval;
397 itval.it_interval.tv_sec = 0;
398 itval.it_interval.tv_usec = 0;
399 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
400 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
402 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
403 negative value for the microseconds is possible only in the case when "now"
404 is more than a second less than "then". That means that itval.it_value.tv_sec
405 is greater than zero. The following correction is therefore safe. */
407 if (itval.it_value.tv_usec < 0)
409 itval.it_value.tv_usec += 1000000;
410 itval.it_value.tv_sec -= 1;
413 DEBUG(D_transport|D_receive)
415 if (!running_in_test_harness)
417 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
418 then_tv->tv_sec, (long) then_tv->tv_usec,
419 now_tv.tv_sec, (long) now_tv.tv_usec);
420 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
421 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
432 /*************************************************
433 * Call fopen() with umask 777 and adjust mode *
434 *************************************************/
436 /* Exim runs with umask(0) so that files created with open() have the mode that
437 is specified in the open() call. However, there are some files, typically in
438 the spool directory, that are created with fopen(). They end up world-writeable
439 if no precautions are taken. Although the spool directory is not accessible to
440 the world, this is an untidiness. So this is a wrapper function for fopen()
441 that sorts out the mode of the created file.
444 filename the file name
445 options the fopen() options
446 mode the required mode
448 Returns: the fopened FILE or NULL
452 modefopen(const uschar *filename, const char *options, mode_t mode)
454 mode_t saved_umask = umask(0777);
455 FILE *f = Ufopen(filename, options);
456 (void)umask(saved_umask);
457 if (f != NULL) (void)fchmod(fileno(f), mode);
464 /*************************************************
465 * Ensure stdin, stdout, and stderr exist *
466 *************************************************/
468 /* Some operating systems grumble if an exec() happens without a standard
469 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
470 file will be opened and will use these fd values, and then some other bit of
471 code will assume, for example, that it can write error messages to stderr.
472 This function ensures that fds 0, 1, and 2 are open if they do not already
473 exist, by connecting them to /dev/null.
475 This function is also used to ensure that std{in,out,err} exist at all times,
476 so that if any library that Exim calls tries to use them, it doesn't crash.
488 for (i = 0; i <= 2; i++)
490 if (fstat(i, &statbuf) < 0 && errno == EBADF)
492 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
493 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
494 string_open_failed(errno, "/dev/null"));
495 if (devnull != i) (void)dup2(devnull, i);
498 if (devnull > 2) (void)close(devnull);
504 /*************************************************
505 * Close unwanted file descriptors for delivery *
506 *************************************************/
508 /* This function is called from a new process that has been forked to deliver
509 an incoming message, either directly, or using exec.
511 We want any smtp input streams to be closed in this new process. However, it
512 has been observed that using fclose() here causes trouble. When reading in -bS
513 input, duplicate copies of messages have been seen. The files will be sharing a
514 file pointer with the parent process, and it seems that fclose() (at least on
515 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
516 least sometimes. Hence we go for closing the underlying file descriptors.
518 If TLS is active, we want to shut down the TLS library, but without molesting
519 the parent's SSL connection.
521 For delivery of a non-SMTP message, we want to close stdin and stdout (and
522 stderr unless debugging) because the calling process might have set them up as
523 pipes and be waiting for them to close before it waits for the submission
524 process to terminate. If they aren't closed, they hold up the calling process
525 until the initial delivery process finishes, which is not what we want.
527 Exception: We do want it for synchronous delivery!
529 And notwithstanding all the above, if D_resolver is set, implying resolver
530 debugging, leave stdout open, because that's where the resolver writes its
533 When we close stderr (which implies we've also closed stdout), we also get rid
534 of any controlling terminal.
546 tls_close(TRUE, FALSE); /* Shut down the TLS library */
548 (void)close(fileno(smtp_in));
549 (void)close(fileno(smtp_out));
554 (void)close(0); /* stdin */
555 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
556 if (debug_selector == 0) /* stderr */
558 if (!synchronous_delivery)
571 /*************************************************
573 *************************************************/
575 /* This function sets a new uid and gid permanently, optionally calling
576 initgroups() to set auxiliary groups. There are some special cases when running
577 Exim in unprivileged modes. In these situations the effective uid will not be
578 root; if we already have the right effective uid/gid, and don't need to
579 initialize any groups, leave things as they are.
584 igflag TRUE if initgroups() wanted
585 msg text to use in debugging output and failure log
587 Returns: nothing; bombs out on failure
591 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
593 uid_t euid = geteuid();
594 gid_t egid = getegid();
596 if (euid == root_uid || euid != uid || egid != gid || igflag)
598 /* At least one OS returns +1 for initgroups failure, so just check for
603 struct passwd *pw = getpwuid(uid);
606 if (initgroups(pw->pw_name, gid) != 0)
607 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
608 (long int)uid, strerror(errno));
610 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
611 "no passwd entry for uid=%ld", (long int)uid);
614 if (setgid(gid) < 0 || setuid(uid) < 0)
616 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
617 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
621 /* Debugging output included uid/gid and all groups */
625 int group_count, save_errno;
626 gid_t group_list[NGROUPS_MAX];
627 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
628 (long int)geteuid(), (long int)getegid(), (long int)getpid());
629 group_count = getgroups(NGROUPS_MAX, group_list);
631 debug_printf(" auxiliary group list:");
635 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
637 else if (group_count < 0)
638 debug_printf(" <error: %s>", strerror(save_errno));
639 else debug_printf(" <none>");
647 /*************************************************
649 *************************************************/
651 /* Exim exits via this function so that it always clears up any open
657 Returns: does not return
665 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
666 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
673 /*************************************************
674 * Extract port from host address *
675 *************************************************/
677 /* Called to extract the port from the values given to -oMa and -oMi.
678 It also checks the syntax of the address, and terminates it before the
679 port data when a port is extracted.
682 address the address, with possible port on the end
684 Returns: the port, or zero if there isn't one
685 bombs out on a syntax error
689 check_port(uschar *address)
691 int port = host_address_extract_port(address);
692 if (string_is_ip_address(address, NULL) == 0)
694 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
702 /*************************************************
703 * Test/verify an address *
704 *************************************************/
706 /* This function is called by the -bv and -bt code. It extracts a working
707 address from a full RFC 822 address. This isn't really necessary per se, but it
708 has the effect of collapsing source routes.
712 flags flag bits for verify_address()
713 exit_value to be set for failures
719 test_address(uschar *s, int flags, int *exit_value)
721 int start, end, domain;
722 uschar *parse_error = NULL;
723 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
727 fprintf(stdout, "syntax error: %s\n", parse_error);
732 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
733 -1, -1, NULL, NULL, NULL);
734 if (rc == FAIL) *exit_value = 2;
735 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
741 /*************************************************
742 * Show supported features *
743 *************************************************/
745 /* This function is called for -bV/--version and for -d to output the optional
746 features of the current Exim binary.
748 Arguments: a FILE for printing
753 show_whats_supported(FILE *f)
757 #ifdef DB_VERSION_STRING
758 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
759 #elif defined(BTREEVERSION) && defined(HASHVERSION)
761 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
763 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
765 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
766 fprintf(f, "Probably ndbm\n");
767 #elif defined(USE_TDB)
768 fprintf(f, "Using tdb\n");
771 fprintf(f, "Probably GDBM (native mode)\n");
773 fprintf(f, "Probably GDBM (compatibility mode)\n");
777 fprintf(f, "Support for:");
778 #ifdef SUPPORT_CRYPTEQ
779 fprintf(f, " crypteq");
782 fprintf(f, " iconv()");
787 #ifdef HAVE_SETCLASSRESOURCES
788 fprintf(f, " use_setclassresources");
797 fprintf(f, " Expand_dlfunc");
799 #ifdef USE_TCP_WRAPPERS
800 fprintf(f, " TCPwrappers");
804 fprintf(f, " GnuTLS");
806 fprintf(f, " OpenSSL");
809 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
810 fprintf(f, " translate_ip_address");
812 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
813 fprintf(f, " move_frozen_messages");
815 #ifdef WITH_CONTENT_SCAN
816 fprintf(f, " Content_Scanning");
821 #ifndef DISABLE_DNSSEC
822 fprintf(f, " DNSSEC");
824 #ifndef DISABLE_EVENT
825 fprintf(f, " Event");
837 fprintf(f, " PROXY");
840 fprintf(f, " SOCKS");
843 fprintf(f, " TCP_Fast_Open");
845 #ifdef EXPERIMENTAL_LMDB
846 fprintf(f, " Experimental_LMDB");
848 #ifdef EXPERIMENTAL_QUEUEFILE
849 fprintf(f, " Experimental_QUEUEFILE");
851 #ifdef EXPERIMENTAL_SPF
852 fprintf(f, " Experimental_SPF");
854 #ifdef EXPERIMENTAL_SRS
855 fprintf(f, " Experimental_SRS");
857 #ifdef EXPERIMENTAL_BRIGHTMAIL
858 fprintf(f, " Experimental_Brightmail");
860 #ifdef EXPERIMENTAL_DANE
861 fprintf(f, " Experimental_DANE");
863 #ifdef EXPERIMENTAL_DCC
864 fprintf(f, " Experimental_DCC");
866 #ifdef EXPERIMENTAL_DMARC
867 fprintf(f, " Experimental_DMARC");
869 #ifdef EXPERIMENTAL_DSN_INFO
870 fprintf(f, " Experimental_DSN_info");
874 fprintf(f, "Lookups (built-in):");
875 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
876 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
878 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
881 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
882 fprintf(f, " dbm dbmjz dbmnz");
884 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
885 fprintf(f, " dnsdb");
887 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
888 fprintf(f, " dsearch");
890 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
891 fprintf(f, " ibase");
893 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
894 fprintf(f, " ldap ldapdn ldapm");
896 #ifdef EXPERIMENTAL_LMDB
899 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
900 fprintf(f, " mysql");
902 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
903 fprintf(f, " nis nis0");
905 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
906 fprintf(f, " nisplus");
908 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
909 fprintf(f, " oracle");
911 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
912 fprintf(f, " passwd");
914 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
915 fprintf(f, " pgsql");
917 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
918 fprintf(f, " redis");
920 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
921 fprintf(f, " sqlite");
923 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
924 fprintf(f, " testdb");
926 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
927 fprintf(f, " whoson");
931 fprintf(f, "Authenticators:");
933 fprintf(f, " cram_md5");
935 #ifdef AUTH_CYRUS_SASL
936 fprintf(f, " cyrus_sasl");
939 fprintf(f, " dovecot");
942 fprintf(f, " gsasl");
944 #ifdef AUTH_HEIMDAL_GSSAPI
945 fprintf(f, " heimdal_gssapi");
947 #ifdef AUTH_PLAINTEXT
948 fprintf(f, " plaintext");
958 fprintf(f, "Routers:");
960 fprintf(f, " accept");
962 #ifdef ROUTER_DNSLOOKUP
963 fprintf(f, " dnslookup");
965 #ifdef ROUTER_IPLITERAL
966 fprintf(f, " ipliteral");
968 #ifdef ROUTER_IPLOOKUP
969 fprintf(f, " iplookup");
971 #ifdef ROUTER_MANUALROUTE
972 fprintf(f, " manualroute");
974 #ifdef ROUTER_QUERYPROGRAM
975 fprintf(f, " queryprogram");
977 #ifdef ROUTER_REDIRECT
978 fprintf(f, " redirect");
982 fprintf(f, "Transports:");
983 #ifdef TRANSPORT_APPENDFILE
984 fprintf(f, " appendfile");
985 #ifdef SUPPORT_MAILDIR
986 fprintf(f, "/maildir");
988 #ifdef SUPPORT_MAILSTORE
989 fprintf(f, "/mailstore");
995 #ifdef TRANSPORT_AUTOREPLY
996 fprintf(f, " autoreply");
998 #ifdef TRANSPORT_LMTP
1001 #ifdef TRANSPORT_PIPE
1002 fprintf(f, " pipe");
1004 #ifdef EXPERIMENTAL_QUEUEFILE
1005 fprintf(f, " queuefile");
1007 #ifdef TRANSPORT_SMTP
1008 fprintf(f, " smtp");
1012 if (fixed_never_users[0] > 0)
1015 fprintf(f, "Fixed never_users: ");
1016 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1017 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1018 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1021 fprintf(f, "Configure owner: %d:%d\n", config_uid, config_gid);
1023 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1025 /* Everything else is details which are only worth reporting when debugging.
1026 Perhaps the tls_version_report should move into this too. */
1031 /* clang defines __GNUC__ (at least, for me) so test for it first */
1032 #if defined(__clang__)
1033 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1034 #elif defined(__GNUC__)
1035 fprintf(f, "Compiler: GCC [%s]\n",
1039 "? unknown version ?"
1043 fprintf(f, "Compiler: <unknown>\n");
1046 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1047 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1048 __GLIBC__, __GLIBC_MINOR__);
1049 if (__GLIBC_PREREQ(2, 1))
1050 fprintf(f, " Runtime: %s\n",
1051 gnu_get_libc_version());
1055 tls_version_report(f);
1058 utf8_version_report(f);
1061 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1062 if (authi->version_report)
1063 (*authi->version_report)(f);
1065 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1066 characters; unless it's an ancient version of PCRE in which case it
1068 #ifndef PCRE_PRERELEASE
1069 # define PCRE_PRERELEASE
1072 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1073 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1075 PCRE_MAJOR, PCRE_MINOR,
1076 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1079 #undef EXPAND_AND_QUOTE
1082 for (i = 0; i < lookup_list_count; i++)
1083 if (lookup_list[i]->version_report)
1084 lookup_list[i]->version_report(f);
1086 #ifdef WHITELIST_D_MACROS
1087 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1089 fprintf(f, "WHITELIST_D_MACROS unset\n");
1091 #ifdef TRUSTED_CONFIG_LIST
1092 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1094 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1101 /*************************************************
1102 * Show auxiliary information about Exim *
1103 *************************************************/
1106 show_exim_information(enum commandline_info request, FILE *stream)
1113 fprintf(stream, "Oops, something went wrong.\n");
1117 "The -bI: flag takes a string indicating which information to provide.\n"
1118 "If the string is not recognised, you'll get this help (on stderr).\n"
1120 " exim -bI:help this information\n"
1121 " exim -bI:dscp dscp value keywords known\n"
1122 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1126 for (pp = exim_sieve_extension_list; *pp; ++pp)
1127 fprintf(stream, "%s\n", *pp);
1130 dscp_list_to_stream(stream);
1136 /*************************************************
1137 * Quote a local part *
1138 *************************************************/
1140 /* This function is used when a sender address or a From: or Sender: header
1141 line is being created from the caller's login, or from an authenticated_id. It
1142 applies appropriate quoting rules for a local part.
1144 Argument: the local part
1145 Returns: the local part, quoted if necessary
1149 local_part_quote(uschar *lpart)
1151 BOOL needs_quote = FALSE;
1156 for (t = lpart; !needs_quote && *t != 0; t++)
1158 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1159 (*t != '.' || t == lpart || t[1] == 0);
1162 if (!needs_quote) return lpart;
1165 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1169 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1172 yield = string_cat(yield, &size, &ptr, lpart);
1175 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1176 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1177 yield = string_catn(yield, &size, &ptr, nq, 1);
1181 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1189 /*************************************************
1190 * Load readline() functions *
1191 *************************************************/
1193 /* This function is called from testing executions that read data from stdin,
1194 but only when running as the calling user. Currently, only -be does this. The
1195 function loads the readline() function library and passes back the functions.
1196 On some systems, it needs the curses library, so load that too, but try without
1197 it if loading fails. All this functionality has to be requested at build time.
1200 fn_readline_ptr pointer to where to put the readline pointer
1201 fn_addhist_ptr pointer to where to put the addhistory function
1203 Returns: the dlopen handle or NULL on failure
1207 set_readline(char * (**fn_readline_ptr)(const char *),
1208 void (**fn_addhist_ptr)(const char *))
1211 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1213 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1214 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1216 if (dlhandle != NULL)
1218 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1219 * char * readline (const char *prompt);
1220 * void add_history (const char *string);
1222 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1223 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1227 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1236 /*************************************************
1237 * Get a line from stdin for testing things *
1238 *************************************************/
1240 /* This function is called when running tests that can take a number of lines
1241 of input (for example, -be and -bt). It handles continuations and trailing
1242 spaces. And prompting and a blank line output on eof. If readline() is in use,
1243 the arguments are non-NULL and provide the relevant functions.
1246 fn_readline readline function or NULL
1247 fn_addhist addhist function or NULL
1249 Returns: pointer to dynamic memory, or NULL at end of file
1253 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1258 uschar *yield = NULL;
1260 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1264 uschar buffer[1024];
1268 char *readline_line = NULL;
1269 if (fn_readline != NULL)
1271 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1272 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1273 p = US readline_line;
1278 /* readline() not in use */
1281 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1285 /* Handle the line */
1287 ss = p + (int)Ustrlen(p);
1288 while (ss > p && isspace(ss[-1])) ss--;
1292 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1295 yield = string_catn(yield, &size, &ptr, p, ss - p);
1298 if (fn_readline != NULL) free(readline_line);
1301 /* yield can only be NULL if ss==p */
1302 if (ss == p || yield[ptr-1] != '\\')
1304 if (yield) yield[ptr] = 0;
1310 if (yield == NULL) printf("\n");
1316 /*************************************************
1317 * Output usage information for the program *
1318 *************************************************/
1320 /* This function is called when there are no recipients
1321 or a specific --help argument was added.
1324 progname information on what name we were called by
1326 Returns: DOES NOT RETURN
1330 exim_usage(uschar *progname)
1333 /* Handle specific program invocation variants */
1334 if (Ustrcmp(progname, US"-mailq") == 0)
1337 "mailq - list the contents of the mail queue\n\n"
1338 "For a list of options, see the Exim documentation.\n");
1342 /* Generic usage - we output this whatever happens */
1344 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1345 "not directly from a shell command line. Options and/or arguments control\n"
1346 "what it does when called. For a list of options, see the Exim documentation.\n");
1353 /*************************************************
1354 * Validate that the macros given are okay *
1355 *************************************************/
1357 /* Typically, Exim will drop privileges if macros are supplied. In some
1358 cases, we want to not do so.
1360 Arguments: opt_D_used - true if the commandline had a "-D" option
1361 Returns: true if trusted, false otherwise
1365 macros_trusted(BOOL opt_D_used)
1367 #ifdef WHITELIST_D_MACROS
1369 uschar *whitelisted, *end, *p, **whites, **w;
1370 int white_count, i, n;
1372 BOOL prev_char_item, found;
1377 #ifndef WHITELIST_D_MACROS
1381 /* We only trust -D overrides for some invoking users:
1382 root, the exim run-time user, the optional config owner user.
1383 I don't know why config-owner would be needed, but since they can own the
1384 config files anyway, there's no security risk to letting them override -D. */
1385 if ( ! ((real_uid == root_uid)
1386 || (real_uid == exim_uid)
1387 #ifdef CONFIGURE_OWNER
1388 || (real_uid == config_uid)
1392 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1396 /* Get a list of macros which are whitelisted */
1397 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1398 prev_char_item = FALSE;
1400 for (p = whitelisted; *p != '\0'; ++p)
1402 if (*p == ':' || isspace(*p))
1407 prev_char_item = FALSE;
1410 if (!prev_char_item)
1411 prev_char_item = TRUE;
1418 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1419 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1424 if (i == white_count)
1426 while (*p != '\0' && p < end)
1432 /* The list of commandline macros should be very short.
1433 Accept the N*M complexity. */
1434 for (m = macros; m; m = m->next) if (m->command_line)
1437 for (w = whites; *w; ++w)
1438 if (Ustrcmp(*w, m->name) == 0)
1445 if (!m->replacement)
1447 if ((len = m->replen) == 0)
1449 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1450 0, PCRE_EOPT, NULL, 0);
1453 if (n != PCRE_ERROR_NOMATCH)
1454 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1458 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1464 /*************************************************
1465 * Entry point and high-level code *
1466 *************************************************/
1468 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1469 the appropriate action. All the necessary functions are present in the one
1470 binary. I originally thought one should split it up, but it turns out that so
1471 much of the apparatus is needed in each chunk that one might as well just have
1472 it all available all the time, which then makes the coding easier as well.
1475 argc count of entries in argv
1476 argv argument strings, with argv[0] being the program name
1478 Returns: EXIT_SUCCESS if terminated successfully
1479 EXIT_FAILURE otherwise, except when a message has been sent
1480 to the sender, and -oee was given
1484 main(int argc, char **cargv)
1486 uschar **argv = USS cargv;
1487 int arg_receive_timeout = -1;
1488 int arg_smtp_receive_timeout = -1;
1489 int arg_error_handling = error_handling;
1490 int filter_sfd = -1;
1491 int filter_ufd = -1;
1494 int list_queue_option = 0;
1496 int msg_action_arg = -1;
1497 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1498 int queue_only_reason = 0;
1500 int perl_start_option = 0;
1502 int recipients_arg = argc;
1503 int sender_address_domain = 0;
1504 int test_retry_arg = -1;
1505 int test_rewrite_arg = -1;
1506 BOOL arg_queue_only = FALSE;
1507 BOOL bi_option = FALSE;
1508 BOOL checking = FALSE;
1509 BOOL count_queue = FALSE;
1510 BOOL expansion_test = FALSE;
1511 BOOL extract_recipients = FALSE;
1512 BOOL flag_G = FALSE;
1513 BOOL flag_n = FALSE;
1514 BOOL forced_delivery = FALSE;
1515 BOOL f_end_dot = FALSE;
1516 BOOL deliver_give_up = FALSE;
1517 BOOL list_queue = FALSE;
1518 BOOL list_options = FALSE;
1519 BOOL list_config = FALSE;
1520 BOOL local_queue_only;
1522 BOOL one_msg_action = FALSE;
1523 BOOL opt_D_used = FALSE;
1524 BOOL queue_only_set = FALSE;
1525 BOOL receiving_message = TRUE;
1526 BOOL sender_ident_set = FALSE;
1527 BOOL session_local_queue_only;
1529 BOOL removed_privilege = FALSE;
1530 BOOL usage_wanted = FALSE;
1531 BOOL verify_address_mode = FALSE;
1532 BOOL verify_as_sender = FALSE;
1533 BOOL version_printed = FALSE;
1534 uschar *alias_arg = NULL;
1535 uschar *called_as = US"";
1536 uschar *cmdline_syslog_name = NULL;
1537 uschar *start_queue_run_id = NULL;
1538 uschar *stop_queue_run_id = NULL;
1539 uschar *expansion_test_message = NULL;
1540 uschar *ftest_domain = NULL;
1541 uschar *ftest_localpart = NULL;
1542 uschar *ftest_prefix = NULL;
1543 uschar *ftest_suffix = NULL;
1544 uschar *log_oneline = NULL;
1545 uschar *malware_test_file = NULL;
1546 uschar *real_sender_address;
1547 uschar *originator_home = US"/";
1552 struct stat statbuf;
1553 pid_t passed_qr_pid = (pid_t)0;
1554 int passed_qr_pipe = -1;
1555 gid_t group_list[NGROUPS_MAX];
1557 /* For the -bI: flag */
1558 enum commandline_info info_flag = CMDINFO_NONE;
1559 BOOL info_stdout = FALSE;
1561 /* Possible options for -R and -S */
1563 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1565 /* Need to define this in case we need to change the environment in order
1566 to get rid of a bogus time zone. We have to make it char rather than uschar
1567 because some OS define it in /usr/include/unistd.h. */
1569 extern char **environ;
1571 /* If the Exim user and/or group and/or the configuration file owner/group were
1572 defined by ref:name at build time, we must now find the actual uid/gid values.
1573 This is a feature to make the lives of binary distributors easier. */
1575 #ifdef EXIM_USERNAME
1576 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1580 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1584 /* If ref:name uses a number as the name, route_finduser() returns
1585 TRUE with exim_uid set and pw coerced to NULL. */
1587 exim_gid = pw->pw_gid;
1588 #ifndef EXIM_GROUPNAME
1592 "exim: ref:name should specify a usercode, not a group.\n"
1593 "exim: can't let you get away with it unless you also specify a group.\n");
1600 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1606 #ifdef EXIM_GROUPNAME
1607 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1609 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1615 #ifdef CONFIGURE_OWNERNAME
1616 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1618 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1619 CONFIGURE_OWNERNAME);
1624 /* We default the system_filter_user to be the Exim run-time user, as a
1625 sane non-root value. */
1626 system_filter_uid = exim_uid;
1628 #ifdef CONFIGURE_GROUPNAME
1629 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1631 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1632 CONFIGURE_GROUPNAME);
1637 /* In the Cygwin environment, some initialization used to need doing.
1638 It was fudged in by means of this macro; now no longer but we'll leave
1639 it in case of others. */
1645 /* Check a field which is patched when we are running Exim within its
1646 testing harness; do a fast initial check, and then the whole thing. */
1648 running_in_test_harness =
1649 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1651 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1652 at the start of a program; however, it seems that some environments do not
1653 follow this. A "strange" locale can affect the formatting of timestamps, so we
1656 setlocale(LC_ALL, "C");
1658 /* Set up the default handler for timing using alarm(). */
1660 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1662 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1663 because store_malloc writes a log entry on failure. */
1665 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1667 fprintf(stderr, "exim: failed to get store for log buffer\n");
1671 /* Initialize the default log options. */
1673 bits_set(log_selector, log_selector_size, log_default);
1675 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1676 NULL when the daemon is run and the file is closed. We have to use this
1677 indirection, because some systems don't allow writing to the variable "stderr".
1680 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1682 /* Arrange for the PCRE regex library to use our store functions. Note that
1683 the normal calls are actually macros that add additional arguments for
1684 debugging purposes so we have to assign specially constructed functions here.
1685 The default is to use store in the stacking pool, but this is overridden in the
1686 regex_must_compile() function. */
1688 pcre_malloc = function_store_get;
1689 pcre_free = function_dummy_free;
1691 /* Ensure there is a big buffer for temporary use in several places. It is put
1692 in malloc store so that it can be freed for enlargement if necessary. */
1694 big_buffer = store_malloc(big_buffer_size);
1696 /* Set up the handler for the data request signal, and set the initial
1697 descriptive text. */
1699 set_process_info("initializing");
1700 os_restarting_signal(SIGUSR1, usr1_handler);
1702 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1703 in the daemon code. For the rest of Exim's uses, we ignore it. */
1705 signal(SIGHUP, SIG_IGN);
1707 /* We don't want to die on pipe errors as the code is written to handle
1708 the write error instead. */
1710 signal(SIGPIPE, SIG_IGN);
1712 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1713 set to SIG_IGN. This causes subprocesses that complete before the parent
1714 process waits for them not to hang around, so when Exim calls wait(), nothing
1715 is there. The wait() code has been made robust against this, but let's ensure
1716 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1717 ending status. We use sigaction rather than plain signal() on those OS where
1718 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1719 problem on AIX with this.) */
1723 struct sigaction act;
1724 act.sa_handler = SIG_DFL;
1725 sigemptyset(&(act.sa_mask));
1727 sigaction(SIGCHLD, &act, NULL);
1730 signal(SIGCHLD, SIG_DFL);
1733 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1738 /* Set up the version number. Set up the leading 'E' for the external form of
1739 message ids, set the pointer to the internal form, and initialize it to
1740 indicate no message being processed. */
1743 message_id_option[0] = '-';
1744 message_id_external = message_id_option + 1;
1745 message_id_external[0] = 'E';
1746 message_id = message_id_external + 1;
1749 /* Set the umask to zero so that any files Exim creates using open() are
1750 created with the modes that it specifies. NOTE: Files created with fopen() have
1751 a problem, which was not recognized till rather late (February 2006). With this
1752 umask, such files will be world writeable. (They are all content scanning files
1753 in the spool directory, which isn't world-accessible, so this is not a
1754 disaster, but it's untidy.) I don't want to change this overall setting,
1755 however, because it will interact badly with the open() calls. Instead, there's
1756 now a function called modefopen() that fiddles with the umask while calling
1761 /* Precompile the regular expression for matching a message id. Keep this in
1762 step with the code that generates ids in the accept.c module. We need to do
1763 this here, because the -M options check their arguments for syntactic validity
1764 using mac_ismsgid, which uses this. */
1767 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1769 /* Precompile the regular expression that is used for matching an SMTP error
1770 code, possibly extended, at the start of an error message. Note that the
1771 terminating whitespace character is included. */
1774 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1777 #ifdef WHITELIST_D_MACROS
1778 /* Precompile the regular expression used to filter the content of macros
1779 given to -D for permissibility. */
1781 regex_whitelisted_macro =
1782 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1785 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1787 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1788 this seems to be a generally accepted convention, since one finds symbolic
1789 links called "mailq" in standard OS configurations. */
1791 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1792 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1795 receiving_message = FALSE;
1796 called_as = US"-mailq";
1799 /* If the program is called as "rmail" treat it as equivalent to
1800 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1801 i.e. preventing a single dot on a line from terminating the message, and
1802 returning with zero return code, even in cases of error (provided an error
1803 message has been sent). */
1805 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1806 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1809 called_as = US"-rmail";
1810 errors_sender_rc = EXIT_SUCCESS;
1813 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1814 this is a smail convention. */
1816 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1817 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1819 smtp_input = smtp_batched_input = TRUE;
1820 called_as = US"-rsmtp";
1823 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1824 this is a smail convention. */
1826 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1827 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1830 receiving_message = FALSE;
1831 called_as = US"-runq";
1834 /* If the program is called as "newaliases" treat it as equivalent to
1835 "exim -bi"; this is a sendmail convention. */
1837 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1838 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1841 receiving_message = FALSE;
1842 called_as = US"-newaliases";
1845 /* Save the original effective uid for a couple of uses later. It should
1846 normally be root, but in some esoteric environments it may not be. */
1848 original_euid = geteuid();
1850 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1851 to be the same as the real ones. This makes a difference only if Exim is setuid
1852 (or setgid) to something other than root, which could be the case in some
1853 special configurations. */
1855 real_uid = getuid();
1856 real_gid = getgid();
1858 if (real_uid == root_uid)
1860 rv = setgid(real_gid);
1863 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1864 (long int)real_gid, strerror(errno));
1867 rv = setuid(real_uid);
1870 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1871 (long int)real_uid, strerror(errno));
1876 /* If neither the original real uid nor the original euid was root, Exim is
1877 running in an unprivileged state. */
1879 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1881 /* Scan the program's arguments. Some can be dealt with right away; others are
1882 simply recorded for checking and handling afterwards. Do a high-level switch
1883 on the second character (the one after '-'), to save some effort. */
1885 for (i = 1; i < argc; i++)
1887 BOOL badarg = FALSE;
1888 uschar *arg = argv[i];
1892 /* An argument not starting with '-' is the start of a recipients list;
1893 break out of the options-scanning loop. */
1901 /* An option consisting of -- terminates the options */
1903 if (Ustrcmp(arg, "--") == 0)
1905 recipients_arg = i + 1;
1909 /* Handle flagged options */
1911 switchchar = arg[1];
1914 /* Make all -ex options synonymous with -oex arguments, since that
1915 is assumed by various callers. Also make -qR options synonymous with -R
1916 options, as that seems to be required as well. Allow for -qqR too, and
1917 the same for -S options. */
1919 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1920 Ustrncmp(arg+1, "qR", 2) == 0 ||
1921 Ustrncmp(arg+1, "qS", 2) == 0)
1923 switchchar = arg[2];
1926 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1928 switchchar = arg[3];
1930 queue_2stage = TRUE;
1933 /* Make -r synonymous with -f, since it is a documented alias */
1935 else if (arg[1] == 'r') switchchar = 'f';
1937 /* Make -ov synonymous with -v */
1939 else if (Ustrcmp(arg, "-ov") == 0)
1945 /* deal with --option_aliases */
1946 else if (switchchar == '-')
1948 if (Ustrcmp(argrest, "help") == 0)
1950 usage_wanted = TRUE;
1953 else if (Ustrcmp(argrest, "version") == 0)
1960 /* High-level switch on active initial letter */
1965 /* sendmail uses -Ac and -Am to control which .cf file is used;
1968 if (*argrest == '\0') { badarg = TRUE; break; }
1971 BOOL ignore = FALSE;
1976 if (*(argrest + 1) == '\0')
1980 if (!ignore) { badarg = TRUE; break; }
1984 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1985 so has no need of it. */
1988 if (*argrest == 0) i++; /* Skip over the type */
1993 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1995 /* -bd: Run in daemon mode, awaiting SMTP connections.
1996 -bdf: Ditto, but in the foreground.
1999 if (*argrest == 'd')
2001 daemon_listen = TRUE;
2002 if (*(++argrest) == 'f') background_daemon = FALSE;
2003 else if (*argrest != 0) { badarg = TRUE; break; }
2006 /* -be: Run in expansion test mode
2007 -bem: Ditto, but read a message from a file first
2010 else if (*argrest == 'e')
2012 expansion_test = checking = TRUE;
2013 if (argrest[1] == 'm')
2015 if (++i >= argc) { badarg = TRUE; break; }
2016 expansion_test_message = argv[i];
2019 if (argrest[1] != 0) { badarg = TRUE; break; }
2022 /* -bF: Run system filter test */
2024 else if (*argrest == 'F')
2026 filter_test |= checking = FTEST_SYSTEM;
2027 if (*(++argrest) != 0) { badarg = TRUE; break; }
2028 if (++i < argc) filter_test_sfile = argv[i]; else
2030 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2035 /* -bf: Run user filter test
2036 -bfd: Set domain for filter testing
2037 -bfl: Set local part for filter testing
2038 -bfp: Set prefix for filter testing
2039 -bfs: Set suffix for filter testing
2042 else if (*argrest == 'f')
2044 if (*(++argrest) == 0)
2046 filter_test |= checking = FTEST_USER;
2047 if (++i < argc) filter_test_ufile = argv[i]; else
2049 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2057 fprintf(stderr, "exim: string expected after %s\n", arg);
2060 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2061 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2062 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2063 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2064 else { badarg = TRUE; break; }
2068 /* -bh: Host checking - an IP address must follow. */
2070 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2072 if (++i >= argc) { badarg = TRUE; break; }
2073 sender_host_address = argv[i];
2074 host_checking = checking = log_testing_mode = TRUE;
2075 host_checking_callout = argrest[1] == 'c';
2076 message_logs = FALSE;
2079 /* -bi: This option is used by sendmail to initialize *the* alias file,
2080 though it has the -oA option to specify a different file. Exim has no
2081 concept of *the* alias file, but since Sun's YP make script calls
2082 sendmail this way, some support must be provided. */
2084 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2086 /* -bI: provide information, of the type to follow after a colon.
2087 This is an Exim flag. */
2089 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2091 uschar *p = &argrest[2];
2092 info_flag = CMDINFO_HELP;
2095 if (strcmpic(p, CUS"sieve") == 0)
2097 info_flag = CMDINFO_SIEVE;
2100 else if (strcmpic(p, CUS"dscp") == 0)
2102 info_flag = CMDINFO_DSCP;
2105 else if (strcmpic(p, CUS"help") == 0)
2112 /* -bm: Accept and deliver message - the default option. Reinstate
2113 receiving_message, which got turned off for all -b options. */
2115 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2117 /* -bmalware: test the filename given for malware */
2119 else if (Ustrcmp(argrest, "malware") == 0)
2121 if (++i >= argc) { badarg = TRUE; break; }
2123 malware_test_file = argv[i];
2126 /* -bnq: For locally originating messages, do not qualify unqualified
2127 addresses. In the envelope, this causes errors; in header lines they
2130 else if (Ustrcmp(argrest, "nq") == 0)
2132 allow_unqualified_sender = FALSE;
2133 allow_unqualified_recipient = FALSE;
2136 /* -bpxx: List the contents of the mail queue, in various forms. If
2137 the option is -bpc, just a queue count is needed. Otherwise, if the
2138 first letter after p is r, then order is random. */
2140 else if (*argrest == 'p')
2142 if (*(++argrest) == 'c')
2145 if (*(++argrest) != 0) badarg = TRUE;
2149 if (*argrest == 'r')
2151 list_queue_option = 8;
2154 else list_queue_option = 0;
2158 /* -bp: List the contents of the mail queue, top-level only */
2160 if (*argrest == 0) {}
2162 /* -bpu: List the contents of the mail queue, top-level undelivered */
2164 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2166 /* -bpa: List the contents of the mail queue, including all delivered */
2168 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2170 /* Unknown after -bp[r] */
2180 /* -bP: List the configuration variables given as the address list.
2181 Force -v, so configuration errors get displayed. */
2183 else if (Ustrcmp(argrest, "P") == 0)
2185 /* -bP config: we need to setup here, because later,
2186 * when list_options is checked, the config is read already */
2187 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2190 readconf_save_config(version_string);
2194 list_options = TRUE;
2195 debug_selector |= D_v;
2196 debug_file = stderr;
2200 /* -brt: Test retry configuration lookup */
2202 else if (Ustrcmp(argrest, "rt") == 0)
2205 test_retry_arg = i + 1;
2209 /* -brw: Test rewrite configuration */
2211 else if (Ustrcmp(argrest, "rw") == 0)
2214 test_rewrite_arg = i + 1;
2218 /* -bS: Read SMTP commands on standard input, but produce no replies -
2219 all errors are reported by sending messages. */
2221 else if (Ustrcmp(argrest, "S") == 0)
2222 smtp_input = smtp_batched_input = receiving_message = TRUE;
2224 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2225 on standard output. */
2227 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2229 /* -bt: address testing mode */
2231 else if (Ustrcmp(argrest, "t") == 0)
2232 address_test_mode = checking = log_testing_mode = TRUE;
2234 /* -bv: verify addresses */
2236 else if (Ustrcmp(argrest, "v") == 0)
2237 verify_address_mode = checking = log_testing_mode = TRUE;
2239 /* -bvs: verify sender addresses */
2241 else if (Ustrcmp(argrest, "vs") == 0)
2243 verify_address_mode = checking = log_testing_mode = TRUE;
2244 verify_as_sender = TRUE;
2247 /* -bV: Print version string and support details */
2249 else if (Ustrcmp(argrest, "V") == 0)
2251 printf("Exim version %s #%s built %s\n", version_string,
2252 version_cnumber, version_date);
2253 printf("%s\n", CS version_copyright);
2254 version_printed = TRUE;
2255 show_whats_supported(stdout);
2256 log_testing_mode = TRUE;
2259 /* -bw: inetd wait mode, accept a listening socket as stdin */
2261 else if (*argrest == 'w')
2263 inetd_wait_mode = TRUE;
2264 background_daemon = FALSE;
2265 daemon_listen = TRUE;
2266 if (*(++argrest) != '\0')
2268 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2269 if (inetd_wait_timeout <= 0)
2271 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2281 /* -C: change configuration file list; ignore if it isn't really
2282 a change! Enforce a prefix check if required. */
2287 if(++i < argc) argrest = argv[i]; else
2288 { badarg = TRUE; break; }
2290 if (Ustrcmp(config_main_filelist, argrest) != 0)
2292 #ifdef ALT_CONFIG_PREFIX
2294 int len = Ustrlen(ALT_CONFIG_PREFIX);
2295 const uschar *list = argrest;
2297 while((filename = string_nextinlist(&list, &sep, big_buffer,
2298 big_buffer_size)) != NULL)
2300 if ((Ustrlen(filename) < len ||
2301 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2302 Ustrstr(filename, "/../") != NULL) &&
2303 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2305 fprintf(stderr, "-C Permission denied\n");
2310 if (real_uid != root_uid)
2312 #ifdef TRUSTED_CONFIG_LIST
2314 if (real_uid != exim_uid
2315 #ifdef CONFIGURE_OWNER
2316 && real_uid != config_uid
2319 trusted_config = FALSE;
2322 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2325 struct stat statbuf;
2327 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2328 (statbuf.st_uid != root_uid /* owner not root */
2329 #ifdef CONFIGURE_OWNER
2330 && statbuf.st_uid != config_uid /* owner not the special one */
2333 (statbuf.st_gid != root_gid /* group not root */
2334 #ifdef CONFIGURE_GROUP
2335 && statbuf.st_gid != config_gid /* group not the special one */
2337 && (statbuf.st_mode & 020) != 0 /* group writeable */
2339 (statbuf.st_mode & 2) != 0) /* world writeable */
2341 trusted_config = FALSE;
2346 /* Well, the trust list at least is up to scratch... */
2347 void *reset_point = store_get(0);
2348 uschar *trusted_configs[32];
2352 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2354 uschar *start = big_buffer, *nl;
2355 while (*start && isspace(*start))
2359 nl = Ustrchr(start, '\n');
2362 trusted_configs[nr_configs++] = string_copy(start);
2363 if (nr_configs == 32)
2371 const uschar *list = argrest;
2373 while (trusted_config && (filename = string_nextinlist(&list,
2374 &sep, big_buffer, big_buffer_size)) != NULL)
2376 for (i=0; i < nr_configs; i++)
2378 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2381 if (i == nr_configs)
2383 trusted_config = FALSE;
2387 store_reset(reset_point);
2391 /* No valid prefixes found in trust_list file. */
2392 trusted_config = FALSE;
2398 /* Could not open trust_list file. */
2399 trusted_config = FALSE;
2403 /* Not root; don't trust config */
2404 trusted_config = FALSE;
2408 config_main_filelist = argrest;
2409 config_changed = TRUE;
2414 /* -D: set up a macro definition */
2417 #ifdef DISABLE_D_OPTION
2418 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2425 uschar *s = argrest;
2428 while (isspace(*s)) s++;
2430 if (*s < 'A' || *s > 'Z')
2432 fprintf(stderr, "exim: macro name set by -D must start with "
2433 "an upper case letter\n");
2437 while (isalnum(*s) || *s == '_')
2439 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2443 if (ptr == 0) { badarg = TRUE; break; }
2444 while (isspace(*s)) s++;
2447 if (*s++ != '=') { badarg = TRUE; break; }
2448 while (isspace(*s)) s++;
2451 for (m = macros; m; m = m->next)
2452 if (Ustrcmp(m->name, name) == 0)
2454 fprintf(stderr, "exim: duplicated -D in command line\n");
2458 m = macro_create(string_copy(name), string_copy(s), TRUE);
2460 if (clmacro_count >= MAX_CLMACROS)
2462 fprintf(stderr, "exim: too many -D options on command line\n");
2465 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2471 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2472 The latter is now a no-op, retained for compatibility only. If -dd is used,
2473 debugging subprocesses of the daemon is disabled. */
2476 if (Ustrcmp(argrest, "ropcr") == 0)
2478 /* drop_cr = TRUE; */
2481 /* Use an intermediate variable so that we don't set debugging while
2482 decoding the debugging bits. */
2486 unsigned int selector = D_default;
2489 if (*argrest == 'd')
2491 debug_daemon = TRUE;
2495 decode_bits(&selector, 1, debug_notall, argrest,
2496 debug_options, debug_options_count, US"debug", 0);
2497 debug_selector = selector;
2502 /* -E: This is a local error message. This option is not intended for
2503 external use at all, but is not restricted to trusted callers because it
2504 does no harm (just suppresses certain error messages) and if Exim is run
2505 not setuid root it won't always be trusted when it generates error
2506 messages using this option. If there is a message id following -E, point
2507 message_reference at it, for logging. */
2510 local_error_message = TRUE;
2511 if (mac_ismsgid(argrest)) message_reference = argrest;
2515 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2516 option, so it looks as if historically the -oex options are also callable
2517 without the leading -o. So we have to accept them. Before the switch,
2518 anything starting -oe has been converted to -e. Exim does not support all
2519 of the sendmail error options. */
2522 if (Ustrcmp(argrest, "e") == 0)
2524 arg_error_handling = ERRORS_SENDER;
2525 errors_sender_rc = EXIT_SUCCESS;
2527 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2528 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2529 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2530 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2535 /* -F: Set sender's full name, used instead of the gecos entry from
2536 the password file. Since users can usually alter their gecos entries,
2537 there's no security involved in using this instead. The data can follow
2538 the -F or be in the next argument. */
2543 if(++i < argc) argrest = argv[i]; else
2544 { badarg = TRUE; break; }
2546 originator_name = argrest;
2547 sender_name_forced = TRUE;
2551 /* -f: Set sender's address - this value is only actually used if Exim is
2552 run by a trusted user, or if untrusted_set_sender is set and matches the
2553 address, except that the null address can always be set by any user. The
2554 test for this happens later, when the value given here is ignored when not
2555 permitted. For an untrusted user, the actual sender is still put in Sender:
2556 if it doesn't match the From: header (unless no_local_from_check is set).
2557 The data can follow the -f or be in the next argument. The -r switch is an
2558 obsolete form of -f but since there appear to be programs out there that
2559 use anything that sendmail has ever supported, better accept it - the
2560 synonymizing is done before the switch above.
2562 At this stage, we must allow domain literal addresses, because we don't
2563 know what the setting of allow_domain_literals is yet. Ditto for trailing
2564 dots and strip_trailing_dot. */
2568 int dummy_start, dummy_end;
2572 if (i+1 < argc) argrest = argv[++i]; else
2573 { badarg = TRUE; break; }
2576 sender_address = string_sprintf(""); /* Ensure writeable memory */
2579 uschar *temp = argrest + Ustrlen(argrest) - 1;
2580 while (temp >= argrest && isspace(*temp)) temp--;
2581 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2582 allow_domain_literals = TRUE;
2583 strip_trailing_dot = TRUE;
2585 allow_utf8_domains = TRUE;
2587 sender_address = parse_extract_address(argrest, &errmess,
2588 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2590 message_smtputf8 = string_is_utf8(sender_address);
2591 allow_utf8_domains = FALSE;
2593 allow_domain_literals = FALSE;
2594 strip_trailing_dot = FALSE;
2595 if (sender_address == NULL)
2597 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2598 return EXIT_FAILURE;
2601 sender_address_forced = TRUE;
2605 /* -G: sendmail invocation to specify that it's a gateway submission and
2606 sendmail may complain about problems instead of fixing them.
2607 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2608 not at this time complain about problems. */
2614 /* -h: Set the hop count for an incoming message. Exim does not currently
2615 support this; it always computes it by counting the Received: headers.
2616 To put it in will require a change to the spool header file format. */
2621 if(++i < argc) argrest = argv[i]; else
2622 { badarg = TRUE; break; }
2624 if (!isdigit(*argrest)) badarg = TRUE;
2628 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2629 not to be documented for sendmail but mailx (at least) uses it) */
2632 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2636 /* -L: set the identifier used for syslog; equivalent to setting
2637 syslog_processname in the config file, but needs to be an admin option. */
2640 if (*argrest == '\0')
2642 if(++i < argc) argrest = argv[i]; else
2643 { badarg = TRUE; break; }
2645 sz = Ustrlen(argrest);
2648 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2649 return EXIT_FAILURE;
2653 fprintf(stderr, "exim: the -L syslog name is too short\n");
2654 return EXIT_FAILURE;
2656 cmdline_syslog_name = argrest;
2660 receiving_message = FALSE;
2662 /* -MC: continue delivery of another message via an existing open
2663 file descriptor. This option is used for an internal call by the
2664 smtp transport when there is a pending message waiting to go to an
2665 address to which it has got a connection. Five subsequent arguments are
2666 required: transport name, host name, IP address, sequence number, and
2667 message_id. Transports may decline to create new processes if the sequence
2668 number gets too big. The channel is stdin. This (-MC) must be the last
2669 argument. There's a subsequent check that the real-uid is privileged.
2671 If we are running in the test harness. delay for a bit, to let the process
2672 that set this one up complete. This makes for repeatability of the logging,
2675 if (Ustrcmp(argrest, "C") == 0)
2677 union sockaddr_46 interface_sock;
2678 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2682 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2683 return EXIT_FAILURE;
2686 if (msg_action_arg >= 0)
2688 fprintf(stderr, "exim: incompatible arguments\n");
2689 return EXIT_FAILURE;
2692 continue_transport = argv[++i];
2693 continue_hostname = argv[++i];
2694 continue_host_address = argv[++i];
2695 continue_sequence = Uatoi(argv[++i]);
2696 msg_action = MSG_DELIVER;
2697 msg_action_arg = ++i;
2698 forced_delivery = TRUE;
2699 queue_run_pid = passed_qr_pid;
2700 queue_run_pipe = passed_qr_pipe;
2702 if (!mac_ismsgid(argv[i]))
2704 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2706 return EXIT_FAILURE;
2709 /* Set up $sending_ip_address and $sending_port, unless proxied */
2711 if (!continue_proxy_cipher)
2712 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2714 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2718 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2720 return EXIT_FAILURE;
2723 if (running_in_test_harness) millisleep(500);
2727 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2731 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2732 precedes -MC (see above). The flag indicates that the host to which
2733 Exim is connected has accepted an AUTH sequence. */
2735 case 'A': smtp_authenticated = TRUE; break;
2737 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2738 that exim is connected to supports the esmtp extension DSN */
2740 case 'D': smtp_peer_options |= OPTION_DSN; break;
2742 /* -MCG: set the queue name, to a non-default value */
2744 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2748 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2750 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2752 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2753 it preceded -MC (see above) */
2755 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2757 /* -MCQ: pass on the pid of the queue-running process that started
2758 this chain of deliveries and the fd of its synchronizing pipe; this
2759 is useful only when it precedes -MC (see above) */
2761 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2763 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2767 /* -MCS: set the smtp_use_size flag; this is useful only when it
2768 precedes -MC (see above) */
2770 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2773 /* -MCt: similar to -MCT below but the connection is still open
2774 via a proxy proces which handles the TLS context and coding.
2775 Require three arguments for the proxied local address and port,
2776 and the TLS cipher. */
2778 case 't': if (++i < argc) sending_ip_address = argv[i];
2780 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2782 if (++i < argc) continue_proxy_cipher = argv[i];
2786 /* -MCT: set the tls_offered flag; this is useful only when it
2787 precedes -MC (see above). The flag indicates that the host to which
2788 Exim is connected has offered TLS support. */
2790 case 'T': smtp_peer_options |= OPTION_TLS; break;
2793 default: badarg = TRUE; break;
2798 /* -M[x]: various operations on the following list of message ids:
2799 -M deliver the messages, ignoring next retry times and thawing
2800 -Mc deliver the messages, checking next retry times, no thawing
2801 -Mf freeze the messages
2802 -Mg give up on the messages
2803 -Mt thaw the messages
2804 -Mrm remove the messages
2805 In the above cases, this must be the last option. There are also the
2806 following options which are followed by a single message id, and which
2807 act on that message. Some of them use the "recipient" addresses as well.
2808 -Mar add recipient(s)
2809 -Mmad mark all recipients delivered
2810 -Mmd mark recipients(s) delivered
2812 -Mset load a message for use with -be
2814 -Mvc show copy (of whole message, in RFC 2822 format)
2819 else if (*argrest == 0)
2821 msg_action = MSG_DELIVER;
2822 forced_delivery = deliver_force_thaw = TRUE;
2824 else if (Ustrcmp(argrest, "ar") == 0)
2826 msg_action = MSG_ADD_RECIPIENT;
2827 one_msg_action = TRUE;
2829 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2830 else if (Ustrcmp(argrest, "es") == 0)
2832 msg_action = MSG_EDIT_SENDER;
2833 one_msg_action = TRUE;
2835 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2836 else if (Ustrcmp(argrest, "g") == 0)
2838 msg_action = MSG_DELIVER;
2839 deliver_give_up = TRUE;
2841 else if (Ustrcmp(argrest, "mad") == 0)
2843 msg_action = MSG_MARK_ALL_DELIVERED;
2845 else if (Ustrcmp(argrest, "md") == 0)
2847 msg_action = MSG_MARK_DELIVERED;
2848 one_msg_action = TRUE;
2850 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2851 else if (Ustrcmp(argrest, "set") == 0)
2853 msg_action = MSG_LOAD;
2854 one_msg_action = TRUE;
2856 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2857 else if (Ustrcmp(argrest, "vb") == 0)
2859 msg_action = MSG_SHOW_BODY;
2860 one_msg_action = TRUE;
2862 else if (Ustrcmp(argrest, "vc") == 0)
2864 msg_action = MSG_SHOW_COPY;
2865 one_msg_action = TRUE;
2867 else if (Ustrcmp(argrest, "vh") == 0)
2869 msg_action = MSG_SHOW_HEADER;
2870 one_msg_action = TRUE;
2872 else if (Ustrcmp(argrest, "vl") == 0)
2874 msg_action = MSG_SHOW_LOG;
2875 one_msg_action = TRUE;
2877 else { badarg = TRUE; break; }
2879 /* All the -Mxx options require at least one message id. */
2881 msg_action_arg = i + 1;
2882 if (msg_action_arg >= argc)
2884 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2885 return EXIT_FAILURE;
2888 /* Some require only message ids to follow */
2890 if (!one_msg_action)
2893 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2895 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2897 return EXIT_FAILURE;
2899 goto END_ARG; /* Remaining args are ids */
2902 /* Others require only one message id, possibly followed by addresses,
2903 which will be handled as normal arguments. */
2907 if (!mac_ismsgid(argv[msg_action_arg]))
2909 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2910 argv[msg_action_arg], arg);
2911 return EXIT_FAILURE;
2918 /* Some programs seem to call the -om option without the leading o;
2919 for sendmail it askes for "me too". Exim always does this. */
2922 if (*argrest != 0) badarg = TRUE;
2926 /* -N: don't do delivery - a debugging option that stops transports doing
2927 their thing. It implies debugging at the D_v level. */
2932 dont_deliver = TRUE;
2933 debug_selector |= D_v;
2934 debug_file = stderr;
2940 /* -n: This means "don't alias" in sendmail, apparently.
2941 For normal invocations, it has no effect.
2942 It may affect some other options. */
2948 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2949 option to the specified value. This form uses long names. We need to handle
2950 -O option=value and -Ooption=value. */
2957 fprintf(stderr, "exim: string expected after -O\n");
2965 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2968 if (*argrest == 'A')
2970 alias_arg = argrest + 1;
2971 if (alias_arg[0] == 0)
2973 if (i+1 < argc) alias_arg = argv[++i]; else
2975 fprintf(stderr, "exim: string expected after -oA\n");
2981 /* -oB: Set a connection message max value for remote deliveries */
2983 else if (*argrest == 'B')
2985 uschar *p = argrest + 1;
2988 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2990 connection_max_messages = 1;
2999 fprintf(stderr, "exim: number expected after -oB\n");
3002 connection_max_messages = Uatoi(p);
3006 /* -odb: background delivery */
3008 else if (Ustrcmp(argrest, "db") == 0)
3010 synchronous_delivery = FALSE;
3011 arg_queue_only = FALSE;
3012 queue_only_set = TRUE;
3015 /* -odf: foreground delivery (smail-compatible option); same effect as
3016 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3019 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3021 synchronous_delivery = TRUE;
3022 arg_queue_only = FALSE;
3023 queue_only_set = TRUE;
3026 /* -odq: queue only */
3028 else if (Ustrcmp(argrest, "dq") == 0)
3030 synchronous_delivery = FALSE;
3031 arg_queue_only = TRUE;
3032 queue_only_set = TRUE;
3035 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3036 but no remote delivery */
3038 else if (Ustrcmp(argrest, "dqs") == 0)
3041 arg_queue_only = FALSE;
3042 queue_only_set = TRUE;
3045 /* -oex: Sendmail error flags. As these are also accepted without the
3046 leading -o prefix, for compatibility with vacation and other callers,
3047 they are handled with -e above. */
3049 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3050 -oitrue: Another sendmail syntax for the same */
3052 else if (Ustrcmp(argrest, "i") == 0 ||
3053 Ustrcmp(argrest, "itrue") == 0)
3056 /* -oM*: Set various characteristics for an incoming message; actually
3057 acted on for trusted callers only. */
3059 else if (*argrest == 'M')
3063 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3067 /* -oMa: Set sender host address */
3069 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3071 /* -oMaa: Set authenticator name */
3073 else if (Ustrcmp(argrest, "Maa") == 0)
3074 sender_host_authenticated = argv[++i];
3076 /* -oMas: setting authenticated sender */
3078 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3080 /* -oMai: setting authenticated id */
3082 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3084 /* -oMi: Set incoming interface address */
3086 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3088 /* -oMm: Message reference */
3090 else if (Ustrcmp(argrest, "Mm") == 0)
3092 if (!mac_ismsgid(argv[i+1]))
3094 fprintf(stderr,"-oMm must be a valid message ID\n");
3097 if (!trusted_config)
3099 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3102 message_reference = argv[++i];
3105 /* -oMr: Received protocol */
3107 else if (Ustrcmp(argrest, "Mr") == 0)
3109 if (received_protocol)
3111 fprintf(stderr, "received_protocol is set already\n");
3114 else received_protocol = argv[++i];
3116 /* -oMs: Set sender host name */
3118 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3120 /* -oMt: Set sender ident */
3122 else if (Ustrcmp(argrest, "Mt") == 0)
3124 sender_ident_set = TRUE;
3125 sender_ident = argv[++i];
3128 /* Else a bad argument */
3137 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3138 seem to call this as -m (undocumented), so that is also accepted (see
3141 else if (Ustrcmp(argrest, "m") == 0) {}
3143 /* -oo: An ancient flag for old-style addresses which still seems to
3144 crop up in some calls (see in SCO). */
3146 else if (Ustrcmp(argrest, "o") == 0) {}
3148 /* -oP <name>: set pid file path for daemon */
3150 else if (Ustrcmp(argrest, "P") == 0)
3151 override_pid_file_path = argv[++i];
3153 /* -or <n>: set timeout for non-SMTP acceptance
3154 -os <n>: set timeout for SMTP acceptance */
3156 else if (*argrest == 'r' || *argrest == 's')
3158 int *tp = (*argrest == 'r')?
3159 &arg_receive_timeout : &arg_smtp_receive_timeout;
3160 if (argrest[1] == 0)
3162 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3164 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3167 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3172 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3174 else if (Ustrcmp(argrest, "X") == 0)
3175 override_local_interfaces = argv[++i];
3177 /* Unknown -o argument */
3183 /* -ps: force Perl startup; -pd force delayed Perl startup */
3187 if (*argrest == 's' && argrest[1] == 0)
3189 perl_start_option = 1;
3192 if (*argrest == 'd' && argrest[1] == 0)
3194 perl_start_option = -1;
3199 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3200 which sets the host protocol and host name */
3204 if (i+1 < argc) argrest = argv[++i]; else
3205 { badarg = TRUE; break; }
3212 if (received_protocol)
3214 fprintf(stderr, "received_protocol is set already\n");
3218 hn = Ustrchr(argrest, ':');
3221 received_protocol = argrest;
3225 int old_pool = store_pool;
3226 store_pool = POOL_PERM;
3227 received_protocol = string_copyn(argrest, hn - argrest);
3228 store_pool = old_pool;
3229 sender_host_name = hn + 1;
3236 receiving_message = FALSE;
3237 if (queue_interval >= 0)
3239 fprintf(stderr, "exim: -q specified more than once\n");
3243 /* -qq...: Do queue runs in a 2-stage manner */
3245 if (*argrest == 'q')
3247 queue_2stage = TRUE;
3251 /* -qi...: Do only first (initial) deliveries */
3253 if (*argrest == 'i')
3255 queue_run_first_delivery = TRUE;
3259 /* -qf...: Run the queue, forcing deliveries
3260 -qff..: Ditto, forcing thawing as well */
3262 if (*argrest == 'f')
3264 queue_run_force = TRUE;
3265 if (*++argrest == 'f')
3267 deliver_force_thaw = TRUE;
3272 /* -q[f][f]l...: Run the queue only on local deliveries */
3274 if (*argrest == 'l')
3276 queue_run_local = TRUE;
3280 /* -q[f][f][l][G<name>]... Work on the named queue */
3282 if (*argrest == 'G')
3285 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3286 queue_name = string_copyn(argrest, i);
3288 if (*argrest == '/') argrest++;
3291 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3292 only, optionally named, optionally starting from a given message id. */
3294 if (*argrest == 0 &&
3295 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3298 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3299 start_queue_run_id = argv[++i];
3300 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3301 stop_queue_run_id = argv[++i];
3304 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3305 forced, optionally local only, optionally named. */
3307 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3310 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3316 case 'R': /* Synonymous with -qR... */
3317 receiving_message = FALSE;
3319 /* -Rf: As -R (below) but force all deliveries,
3320 -Rff: Ditto, but also thaw all frozen messages,
3321 -Rr: String is regex
3322 -Rrf: Regex and force
3323 -Rrff: Regex and force and thaw
3325 in all cases provided there are no further characters in this
3331 for (i = 0; i < nelem(rsopts); i++)
3332 if (Ustrcmp(argrest, rsopts[i]) == 0)
3334 if (i != 2) queue_run_force = TRUE;
3335 if (i >= 2) deliver_selectstring_regex = TRUE;
3336 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3337 argrest += Ustrlen(rsopts[i]);
3341 /* -R: Set string to match in addresses for forced queue run to
3342 pick out particular messages. */
3345 deliver_selectstring = argrest;
3346 else if (i+1 < argc)
3347 deliver_selectstring = argv[++i];
3350 fprintf(stderr, "exim: string expected after -R\n");
3356 /* -r: an obsolete synonym for -f (see above) */
3359 /* -S: Like -R but works on sender. */
3361 case 'S': /* Synonymous with -qS... */
3362 receiving_message = FALSE;
3364 /* -Sf: As -S (below) but force all deliveries,
3365 -Sff: Ditto, but also thaw all frozen messages,
3366 -Sr: String is regex
3367 -Srf: Regex and force
3368 -Srff: Regex and force and thaw
3370 in all cases provided there are no further characters in this
3376 for (i = 0; i < nelem(rsopts); i++)
3377 if (Ustrcmp(argrest, rsopts[i]) == 0)
3379 if (i != 2) queue_run_force = TRUE;
3380 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3381 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3382 argrest += Ustrlen(rsopts[i]);
3386 /* -S: Set string to match in addresses for forced queue run to
3387 pick out particular messages. */
3390 deliver_selectstring_sender = argrest;
3391 else if (i+1 < argc)
3392 deliver_selectstring_sender = argv[++i];
3395 fprintf(stderr, "exim: string expected after -S\n");
3400 /* -Tqt is an option that is exclusively for use by the testing suite.
3401 It is not recognized in other circumstances. It allows for the setting up
3402 of explicit "queue times" so that various warning/retry things can be
3403 tested. Otherwise variability of clock ticks etc. cause problems. */
3406 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3407 fudged_queue_times = argv[++i];
3412 /* -t: Set flag to extract recipients from body of message. */
3415 if (*argrest == 0) extract_recipients = TRUE;
3417 /* -ti: Set flag to extract recipients from body of message, and also
3418 specify that dot does not end the message. */
3420 else if (Ustrcmp(argrest, "i") == 0)
3422 extract_recipients = TRUE;
3426 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3429 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3436 /* -U: This means "initial user submission" in sendmail, apparently. The
3437 doc claims that in future sendmail may refuse syntactically invalid
3438 messages instead of fixing them. For the moment, we just ignore it. */
3444 /* -v: verify things - this is a very low-level debugging */
3449 debug_selector |= D_v;
3450 debug_file = stderr;
3456 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3458 The -x flag tells the sendmail command that mail from a local
3459 mail program has National Language Support (NLS) extended characters
3460 in the body of the mail item. The sendmail command can send mail with
3461 extended NLS characters across networks that normally corrupts these
3464 As Exim is 8-bit clean, it just ignores this flag. */
3467 if (*argrest != 0) badarg = TRUE;
3470 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3471 logs to that file. We swallow the parameter and otherwise ignore it. */
3474 if (*argrest == '\0')
3477 fprintf(stderr, "exim: string expected after -X\n");
3483 if (*argrest == '\0')
3484 if (++i < argc) log_oneline = argv[i]; else
3486 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3491 /* All other initial characters are errors */
3496 } /* End of high-level switch statement */
3498 /* Failed to recognize the option, or syntax error */
3502 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3503 "option %s\n", arg);
3509 /* If -R or -S have been specified without -q, assume a single queue run. */
3511 if ( (deliver_selectstring || deliver_selectstring_sender)
3512 && queue_interval < 0)
3517 /* If usage_wanted is set we call the usage function - which never returns */
3518 if (usage_wanted) exim_usage(called_as);
3520 /* Arguments have been processed. Check for incompatibilities. */
3522 (smtp_input || extract_recipients || recipients_arg < argc) &&
3523 (daemon_listen || queue_interval >= 0 || bi_option ||
3524 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3525 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3528 msg_action_arg > 0 &&
3529 (daemon_listen || queue_interval > 0 || list_options ||
3530 (checking && msg_action != MSG_LOAD) ||
3531 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3534 (daemon_listen || queue_interval > 0) &&
3535 (sender_address != NULL || list_options || list_queue || checking ||
3539 daemon_listen && queue_interval == 0
3542 inetd_wait_mode && queue_interval >= 0
3546 (checking || smtp_input || extract_recipients ||
3547 filter_test != FTEST_NONE || bi_option)
3550 verify_address_mode &&
3551 (address_test_mode || smtp_input || extract_recipients ||
3552 filter_test != FTEST_NONE || bi_option)
3555 address_test_mode && (smtp_input || extract_recipients ||
3556 filter_test != FTEST_NONE || bi_option)
3559 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3563 deliver_selectstring != NULL && queue_interval < 0
3566 msg_action == MSG_LOAD &&
3567 (!expansion_test || expansion_test_message != NULL)
3571 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3575 /* If debugging is set up, set the file and the file descriptor to pass on to
3576 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3577 to run in the foreground. */
3579 if (debug_selector != 0)
3581 debug_file = stderr;
3582 debug_fd = fileno(debug_file);
3583 background_daemon = FALSE;
3584 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3585 if (debug_selector != D_v) /* -v only doesn't show this */
3587 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3588 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3590 if (!version_printed)
3591 show_whats_supported(stderr);
3595 /* When started with root privilege, ensure that the limits on the number of
3596 open files and the number of processes (where that is accessible) are
3597 sufficiently large, or are unset, in case Exim has been called from an
3598 environment where the limits are screwed down. Not all OS have the ability to
3599 change some of these limits. */
3603 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3609 #ifdef RLIMIT_NOFILE
3610 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3612 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3614 rlp.rlim_cur = rlp.rlim_max = 0;
3617 /* I originally chose 1000 as a nice big number that was unlikely to
3618 be exceeded. It turns out that some older OS have a fixed upper limit of
3621 if (rlp.rlim_cur < 1000)
3623 rlp.rlim_cur = rlp.rlim_max = 1000;
3624 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3626 rlp.rlim_cur = rlp.rlim_max = 256;
3627 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3628 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3635 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3637 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3639 rlp.rlim_cur = rlp.rlim_max = 0;
3642 #ifdef RLIM_INFINITY
3643 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3645 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3647 if (rlp.rlim_cur < 1000)
3649 rlp.rlim_cur = rlp.rlim_max = 1000;
3651 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3652 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3658 /* Exim is normally entered as root (but some special configurations are
3659 possible that don't do this). However, it always spins off sub-processes that
3660 set their uid and gid as required for local delivery. We don't want to pass on
3661 any extra groups that root may belong to, so we want to get rid of them all at
3664 We need to obey setgroups() at this stage, before possibly giving up root
3665 privilege for a changed configuration file, but later on we might need to
3666 check on the additional groups for the admin user privilege - can't do that
3667 till after reading the config, which might specify the exim gid. Therefore,
3668 save the group list here first. */
3670 group_count = getgroups(NGROUPS_MAX, group_list);
3671 if (group_count < 0)
3673 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3677 /* There is a fundamental difference in some BSD systems in the matter of
3678 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3679 known not to be different. On the "different" systems there is a single group
3680 list, and the first entry in it is the current group. On all other versions of
3681 Unix there is a supplementary group list, which is in *addition* to the current
3682 group. Consequently, to get rid of all extraneous groups on a "standard" system
3683 you pass over 0 groups to setgroups(), while on a "different" system you pass
3684 over a single group - the current group, which is always the first group in the
3685 list. Calling setgroups() with zero groups on a "different" system results in
3686 an error return. The following code should cope with both types of system.
3688 However, if this process isn't running as root, setgroups() can't be used
3689 since you have to be root to run it, even if throwing away groups. Not being
3690 root here happens only in some unusual configurations. We just ignore the
3693 if (setgroups(0, NULL) != 0)
3695 if (setgroups(1, group_list) != 0 && !unprivileged)
3697 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3702 /* If the configuration file name has been altered by an argument on the
3703 command line (either a new file name or a macro definition) and the caller is
3704 not root, or if this is a filter testing run, remove any setuid privilege the
3705 program has and run as the underlying user.
3707 The exim user is locked out of this, which severely restricts the use of -C
3710 Otherwise, set the real ids to the effective values (should be root unless run
3711 from inetd, which it can either be root or the exim uid, if one is configured).
3713 There is a private mechanism for bypassing some of this, in order to make it
3714 possible to test lots of configurations automatically, without having either to
3715 recompile each time, or to patch in an actual configuration file name and other
3716 values (such as the path name). If running in the test harness, pretend that
3717 configuration file changes and macro definitions haven't happened. */
3720 (!trusted_config || /* Config changed, or */
3721 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3722 real_uid != root_uid && /* Not root, and */
3723 !running_in_test_harness /* Not fudged */
3725 expansion_test /* expansion testing */
3727 filter_test != FTEST_NONE) /* Filter testing */
3729 setgroups(group_count, group_list);
3730 exim_setugid(real_uid, real_gid, FALSE,
3731 US"-C, -D, -be or -bf forces real uid");
3732 removed_privilege = TRUE;
3734 /* In the normal case when Exim is called like this, stderr is available
3735 and should be used for any logging information because attempts to write
3736 to the log will usually fail. To arrange this, we unset really_exim. However,
3737 if no stderr is available there is no point - we might as well have a go
3738 at the log (if it fails, syslog will be written).
3740 Note that if the invoker is Exim, the logs remain available. Messing with
3741 this causes unlogged successful deliveries. */
3743 if ((log_stderr != NULL) && (real_uid != exim_uid))
3744 really_exim = FALSE;
3747 /* Privilege is to be retained for the moment. It may be dropped later,
3748 depending on the job that this Exim process has been asked to do. For now, set
3749 the real uid to the effective so that subsequent re-execs of Exim are done by a
3752 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3754 /* If testing a filter, open the file(s) now, before wasting time doing other
3755 setups and reading the message. */
3757 if ((filter_test & FTEST_SYSTEM) != 0)
3759 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3762 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3764 return EXIT_FAILURE;
3768 if ((filter_test & FTEST_USER) != 0)
3770 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3773 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3775 return EXIT_FAILURE;
3779 /* Initialise lookup_list
3780 If debugging, already called above via version reporting.
3781 In either case, we initialise the list of available lookups while running
3782 as root. All dynamically modules are loaded from a directory which is
3783 hard-coded into the binary and is code which, if not a module, would be
3784 part of Exim already. Ability to modify the content of the directory
3785 is equivalent to the ability to modify a setuid binary!
3787 This needs to happen before we read the main configuration. */
3791 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3794 /* Read the main runtime configuration data; this gives up if there
3795 is a failure. It leaves the configuration file open so that the subsequent
3796 configuration data for delivery can be read if needed.
3798 NOTE: immediatly after opening the configuration file we change the working
3799 directory to "/"! Later we change to $spool_directory. We do it there, because
3800 during readconf_main() some expansion takes place already. */
3802 /* Store the initial cwd before we change directories */
3803 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3805 perror("exim: can't get the current working directory");
3810 -be[m] expansion test -
3811 -b[fF] filter test new
3813 -bmalware malware_test_file new
3815 -brw rewrite test new
3817 -bv[s] address verify -
3819 -bP <option> (except -bP config, which sets list_config)
3821 If any of these options is set, we suppress warnings about configuration
3822 issues (currently about tls_advertise_hosts and keep_environment not being
3825 readconf_main(checking || list_options);
3827 if (builtin_macros_create_trigger) DEBUG(D_any)
3828 debug_printf("Builtin macros created (expensive) due to config line '%.*s'\n",
3829 Ustrlen(builtin_macros_create_trigger)-1, builtin_macros_create_trigger);
3831 /* Now in directory "/" */
3833 if (cleanup_environment() == FALSE)
3834 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3837 /* If an action on specific messages is requested, or if a daemon or queue
3838 runner is being started, we need to know if Exim was called by an admin user.
3839 This is the case if the real user is root or exim, or if the real group is
3840 exim, or if one of the supplementary groups is exim or a group listed in
3841 admin_groups. We don't fail all message actions immediately if not admin_user,
3842 since some actions can be performed by non-admin users. Instead, set admin_user
3843 for later interrogation. */
3845 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3850 for (i = 0; i < group_count && !admin_user; i++)
3851 if (group_list[i] == exim_gid)
3853 else if (admin_groups)
3854 for (j = 1; j <= (int)admin_groups[0] && !admin_user; j++)
3855 if (admin_groups[j] == group_list[i])
3859 /* Another group of privileged users are the trusted users. These are root,
3860 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3861 are permitted to specify sender_addresses with -f on the command line, and
3862 other message parameters as well. */
3864 if (real_uid == root_uid || real_uid == exim_uid)
3865 trusted_caller = TRUE;
3871 for (i = 1; i <= (int)trusted_users[0] && !trusted_caller; i++)
3872 if (trusted_users[i] == real_uid)
3873 trusted_caller = TRUE;
3876 for (i = 1; i <= (int)trusted_groups[0] && !trusted_caller; i++)
3877 if (trusted_groups[i] == real_gid)
3878 trusted_caller = TRUE;
3879 else for (j = 0; j < group_count && !trusted_caller; j++)
3880 if (trusted_groups[i] == group_list[j])
3881 trusted_caller = TRUE;
3884 /* At this point, we know if the user is privileged and some command-line
3885 options become possibly imperssible, depending upon the configuration file. */
3887 if (checking && commandline_checks_require_admin && !admin_user) {
3888 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3892 /* Handle the decoding of logging options. */
3894 decode_bits(log_selector, log_selector_size, log_notall,
3895 log_selector_string, log_options, log_options_count, US"log", 0);
3900 debug_printf("configuration file is %s\n", config_main_filename);
3901 debug_printf("log selectors =");
3902 for (i = 0; i < log_selector_size; i++)
3903 debug_printf(" %08x", log_selector[i]);
3907 /* If domain literals are not allowed, check the sender address that was
3908 supplied with -f. Ditto for a stripped trailing dot. */
3910 if (sender_address != NULL)
3912 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3914 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3915 "allowed\n", sender_address);
3916 return EXIT_FAILURE;
3918 if (f_end_dot && !strip_trailing_dot)
3920 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3921 "(trailing dot not allowed)\n", sender_address);
3922 return EXIT_FAILURE;
3926 /* See if an admin user overrode our logging. */
3928 if (cmdline_syslog_name != NULL)
3932 syslog_processname = cmdline_syslog_name;
3933 log_file_path = string_copy(CUS"syslog");
3937 /* not a panic, non-privileged users should not be able to spam paniclog */
3939 "exim: you lack sufficient privilege to specify syslog process name\n");
3940 return EXIT_FAILURE;
3944 /* Paranoia check of maximum lengths of certain strings. There is a check
3945 on the length of the log file path in log.c, which will come into effect
3946 if there are any calls to write the log earlier than this. However, if we
3947 get this far but the string is very long, it is better to stop now than to
3948 carry on and (e.g.) receive a message and then have to collapse. The call to
3949 log_write() from here will cause the ultimate panic collapse if the complete
3950 file name exceeds the buffer length. */
3952 if (Ustrlen(log_file_path) > 200)
3953 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3954 "log_file_path is longer than 200 chars: aborting");
3956 if (Ustrlen(pid_file_path) > 200)
3957 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3958 "pid_file_path is longer than 200 chars: aborting");
3960 if (Ustrlen(spool_directory) > 200)
3961 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3962 "spool_directory is longer than 200 chars: aborting");
3964 /* Length check on the process name given to syslog for its TAG field,
3965 which is only permitted to be 32 characters or less. See RFC 3164. */
3967 if (Ustrlen(syslog_processname) > 32)
3968 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3969 "syslog_processname is longer than 32 chars: aborting");
3974 log_write(0, LOG_MAIN, "%s", log_oneline);
3975 return EXIT_SUCCESS;
3978 return EXIT_FAILURE;
3980 /* In some operating systems, the environment variable TMPDIR controls where
3981 temporary files are created; Exim doesn't use these (apart from when delivering
3982 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3983 If TMPDIR is found in the environment, reset it to the value defined in the
3984 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3985 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3986 EXIM_TMPDIR by the build scripts.
3992 if (environ) for (p = USS environ; *p; p++)
3993 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3995 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3996 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3998 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4003 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4004 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4005 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4006 called by a user who has set the TZ variable. This then affects the timestamps
4007 in log files and in Received: headers, and any created Date: header lines. The
4008 required timezone is settable in the configuration file, so nothing can be done
4009 about this earlier - but hopefully nothing will normally be logged earlier than
4010 this. We have to make a new environment if TZ is wrong, but don't bother if
4011 timestamps_utc is set, because then all times are in UTC anyway. */
4013 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4014 timestamps_utc = TRUE;
4017 uschar *envtz = US getenv("TZ");
4019 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4020 : timezone_string != NULL
4023 uschar **p = USS environ;
4027 if (environ) while (*p++) count++;
4028 if (!envtz) count++;
4029 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4030 if (environ) for (p = USS environ; *p; p++)
4031 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4032 if (timezone_string)
4034 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4035 sprintf(CS *newp++, "TZ=%s", timezone_string);
4040 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4041 tod_stamp(tod_log));
4045 /* Handle the case when we have removed the setuid privilege because of -C or
4046 -D. This means that the caller of Exim was not root.
4048 There is a problem if we were running as the Exim user. The sysadmin may
4049 expect this case to retain privilege because "the binary was called by the
4050 Exim user", but it hasn't, because either the -D option set macros, or the
4051 -C option set a non-trusted configuration file. There are two possibilities:
4053 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4054 to do message deliveries. Thus, the fact that it is running as a
4055 non-privileged user is plausible, and might be wanted in some special
4056 configurations. However, really_exim will have been set false when
4057 privilege was dropped, to stop Exim trying to write to its normal log
4058 files. Therefore, re-enable normal log processing, assuming the sysadmin
4059 has set up the log directory correctly.
4061 (2) If deliver_drop_privilege is not set, the configuration won't work as
4062 apparently intended, and so we log a panic message. In order to retain
4063 root for -C or -D, the caller must either be root or be invoking a
4064 trusted configuration file (when deliver_drop_privilege is false). */
4066 if ( removed_privilege
4067 && (!trusted_config || opt_D_used)
4068 && real_uid == exim_uid)
4069 if (deliver_drop_privilege)
4070 really_exim = TRUE; /* let logging work normally */
4072 log_write(0, LOG_MAIN|LOG_PANIC,
4073 "exim user lost privilege for using %s option",
4074 trusted_config? "-D" : "-C");
4076 /* Start up Perl interpreter if Perl support is configured and there is a
4077 perl_startup option, and the configuration or the command line specifies
4078 initializing starting. Note that the global variables are actually called
4079 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4082 if (perl_start_option != 0)
4083 opt_perl_at_start = (perl_start_option > 0);
4084 if (opt_perl_at_start && opt_perl_startup != NULL)
4087 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4088 errstr = init_perl(opt_perl_startup);
4091 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4092 return EXIT_FAILURE;
4094 opt_perl_started = TRUE;
4096 #endif /* EXIM_PERL */
4098 /* Log the arguments of the call if the configuration file said so. This is
4099 a debugging feature for finding out what arguments certain MUAs actually use.
4100 Don't attempt it if logging is disabled, or if listing variables or if
4101 verifying/testing addresses or expansions. */
4103 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4104 && really_exim && !list_options && !checking)
4107 uschar *p = big_buffer;
4108 Ustrcpy(p, "cwd= (failed)");
4110 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4113 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4115 for (i = 0; i < argc; i++)
4117 int len = Ustrlen(argv[i]);
4118 const uschar *printing;
4120 if (p + len + 8 >= big_buffer + big_buffer_size)
4123 log_write(0, LOG_MAIN, "%s", big_buffer);
4124 Ustrcpy(big_buffer, "...");
4127 printing = string_printing(argv[i]);
4128 if (printing[0] == 0) quote = US"\""; else
4130 const uschar *pp = printing;
4132 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4134 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4135 (p - big_buffer) - 4), printing, quote);
4138 if (LOGGING(arguments))
4139 log_write(0, LOG_MAIN, "%s", big_buffer);
4141 debug_printf("%s\n", big_buffer);
4144 /* Set the working directory to be the top-level spool directory. We don't rely
4145 on this in the code, which always uses fully qualified names, but it's useful
4146 for core dumps etc. Don't complain if it fails - the spool directory might not
4147 be generally accessible and calls with the -C option (and others) have lost
4148 privilege by now. Before the chdir, we try to ensure that the directory exists.
4151 if (Uchdir(spool_directory) != 0)
4154 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4155 dummy = /* quieten compiler */ Uchdir(spool_directory);
4156 dummy = dummy; /* yet more compiler quietening, sigh */
4159 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4160 alias file. Exim doesn't have such a concept, but this call is screwed into
4161 Sun's YP makefiles. Handle this by calling a configured script, as the real
4162 user who called Exim. The -oA option can be used to pass an argument to the
4167 (void)fclose(config_file);
4168 if (bi_command != NULL)
4172 argv[i++] = bi_command;
4173 if (alias_arg != NULL) argv[i++] = alias_arg;
4176 setgroups(group_count, group_list);
4177 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4179 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4180 (argv[1] == NULL)? US"" : argv[1]);
4182 execv(CS argv[0], (char *const *)argv);
4183 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4188 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4193 /* We moved the admin/trusted check to be immediately after reading the
4194 configuration file. We leave these prints here to ensure that syslog setup,
4195 logfile setup, and so on has already happened. */
4197 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4198 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4200 /* Only an admin user may start the daemon or force a queue run in the default
4201 configuration, but the queue run restriction can be relaxed. Only an admin
4202 user may request that a message be returned to its sender forthwith. Only an
4203 admin user may specify a debug level greater than D_v (because it might show
4204 passwords, etc. in lookup queries). Only an admin user may request a queue
4205 count. Only an admin user can use the test interface to scan for email
4206 (because Exim will be in the spool dir and able to look at mails). */
4210 BOOL debugset = (debug_selector & ~D_v) != 0;
4211 if (deliver_give_up || daemon_listen || malware_test_file ||
4212 (count_queue && queue_list_requires_admin) ||
4213 (list_queue && queue_list_requires_admin) ||
4214 (queue_interval >= 0 && prod_requires_admin) ||
4215 (debugset && !running_in_test_harness))
4217 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4222 /* If the real user is not root or the exim uid, the argument for passing
4223 in an open TCP/IP connection for another message is not permitted, nor is
4224 running with the -N option for any delivery action, unless this call to exim is
4225 one that supplied an input message, or we are using a patched exim for
4226 regression testing. */
4228 if (real_uid != root_uid && real_uid != exim_uid &&
4229 (continue_hostname != NULL ||
4231 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4232 )) && !running_in_test_harness)
4234 fprintf(stderr, "exim: Permission denied\n");
4235 return EXIT_FAILURE;
4238 /* If the caller is not trusted, certain arguments are ignored when running for
4239 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4240 Note that authority for performing certain actions on messages is tested in the
4241 queue_action() function. */
4243 if (!trusted_caller && !checking)
4245 sender_host_name = sender_host_address = interface_address =
4246 sender_ident = received_protocol = NULL;
4247 sender_host_port = interface_port = 0;
4248 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4251 /* If a sender host address is set, extract the optional port number off the
4252 end of it and check its syntax. Do the same thing for the interface address.
4253 Exim exits if the syntax is bad. */
4257 if (sender_host_address != NULL)
4258 sender_host_port = check_port(sender_host_address);
4259 if (interface_address != NULL)
4260 interface_port = check_port(interface_address);
4263 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4268 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4269 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4273 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4274 return EXIT_FAILURE;
4278 /* If an SMTP message is being received check to see if the standard input is a
4279 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4280 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4285 union sockaddr_46 inetd_sock;
4286 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4287 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4289 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4290 if (family == AF_INET || family == AF_INET6)
4292 union sockaddr_46 interface_sock;
4293 size = sizeof(interface_sock);
4295 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4296 interface_address = host_ntoa(-1, &interface_sock, NULL,
4299 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4301 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4304 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4305 NULL, &sender_host_port);
4306 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4307 "inetd is not supported when mua_wrapper is set");
4312 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4313 return EXIT_FAILURE;
4319 /* If the load average is going to be needed while receiving a message, get it
4320 now for those OS that require the first call to os_getloadavg() to be done as
4321 root. There will be further calls later for each message received. */
4323 #ifdef LOAD_AVG_NEEDS_ROOT
4324 if (receiving_message &&
4325 (queue_only_load >= 0 ||
4326 (is_inetd && smtp_load_reserve >= 0)
4329 load_average = OS_GETLOADAVG();
4333 /* The queue_only configuration option can be overridden by -odx on the command
4334 line, except that if queue_only_override is false, queue_only cannot be unset
4335 from the command line. */
4337 if (queue_only_set && (queue_only_override || arg_queue_only))
4338 queue_only = arg_queue_only;
4340 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4343 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4344 if (arg_smtp_receive_timeout >= 0)
4345 smtp_receive_timeout = arg_smtp_receive_timeout;
4347 /* If Exim was started with root privilege, unless we have already removed the
4348 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4349 except when starting the daemon or doing some kind of delivery or address
4350 testing (-bt). These are the only cases when root need to be retained. We run
4351 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4352 retained only for starting the daemon. We always do the initgroups() in this
4353 situation (controlled by the TRUE below), in order to be as close as possible
4354 to the state Exim usually runs in. */
4356 if (!unprivileged && /* originally had root AND */
4357 !removed_privilege && /* still got root AND */
4358 !daemon_listen && /* not starting the daemon */
4359 queue_interval <= 0 && /* (either kind of daemon) */
4361 deliver_drop_privilege || /* requested unprivileged */
4363 queue_interval < 0 && /* not running the queue */
4364 (msg_action_arg < 0 || /* and */
4365 msg_action != MSG_DELIVER) && /* not delivering and */
4366 (!checking || !address_test_mode) /* not address checking */
4368 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4370 /* When we are retaining a privileged uid, we still change to the exim gid. */
4375 rv = setgid(exim_gid);
4376 /* Impact of failure is that some stuff might end up with an incorrect group.
4377 We track this for failures from root, since any attempt to change privilege
4378 by root should succeed and failures should be examined. For non-root,
4379 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4380 no need to complain then. */
4382 if (!(unprivileged || removed_privilege))
4385 "exim: changing group failed: %s\n", strerror(errno));
4389 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4390 (long int)exim_gid, strerror(errno));
4393 /* Handle a request to scan a file for malware */
4394 if (malware_test_file)
4396 #ifdef WITH_CONTENT_SCAN
4398 set_process_info("scanning file for malware");
4399 result = malware_in_file(malware_test_file);
4402 printf("No malware found.\n");
4407 printf("Malware lookup returned non-okay/fail: %d\n", result);
4411 printf("Malware found: %s\n", malware_name);
4413 printf("Malware scan detected malware of unknown name.\n");
4415 printf("Malware scanning not enabled at compile time.\n");
4420 /* Handle a request to list the delivery queue */
4424 set_process_info("listing the queue");
4425 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4429 /* Handle a request to count the delivery queue */
4433 set_process_info("counting the queue");
4438 /* Handle actions on specific messages, except for the force delivery and
4439 message load actions, which are done below. Some actions take a whole list of
4440 message ids, which are known to continue up to the end of the arguments. Others
4441 take a single message id and then operate on the recipients list. */
4443 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4445 int yield = EXIT_SUCCESS;
4446 set_process_info("acting on specified messages");
4448 if (!one_msg_action)
4450 for (i = msg_action_arg; i < argc; i++)
4451 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4452 yield = EXIT_FAILURE;
4455 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4456 recipients_arg)) yield = EXIT_FAILURE;
4460 /* We used to set up here to skip reading the ACL section, on
4461 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4462 Now, since the intro of the ${acl } expansion, ACL definitions may be
4463 needed in transports so we lost the optimisation. */
4467 /* The configuration data will have been read into POOL_PERM because we won't
4468 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4469 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4470 configuration were read into POOL_MAIN, because we don't do any resets till
4471 later on. However, it seems right, and it does ensure that both pools get used.
4474 store_pool = POOL_MAIN;
4476 /* Handle the -brt option. This is for checking out retry configurations.
4477 The next three arguments are a domain name or a complete address, and
4478 optionally two error numbers. All it does is to call the function that
4479 scans the retry configuration data. */
4481 if (test_retry_arg >= 0)
4483 retry_config *yield;
4484 int basic_errno = 0;
4488 if (test_retry_arg >= argc)
4490 printf("-brt needs a domain or address argument\n");
4491 exim_exit(EXIT_FAILURE);
4493 s1 = argv[test_retry_arg++];
4496 /* If the first argument contains no @ and no . it might be a local user
4497 or it might be a single-component name. Treat as a domain. */
4499 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4501 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4502 "being \ntreated as a one-component domain, not as a local part.\n\n",
4506 /* There may be an optional second domain arg. */
4508 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4509 s2 = argv[test_retry_arg++];
4511 /* The final arg is an error name */
4513 if (test_retry_arg < argc)
4515 uschar *ss = argv[test_retry_arg];
4517 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4520 printf("%s\n", CS error);
4521 return EXIT_FAILURE;
4524 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4525 code > 100 as an error is for matching codes to the decade. Turn them into
4526 a real error code, off the decade. */
4528 if (basic_errno == ERRNO_MAIL4XX ||
4529 basic_errno == ERRNO_RCPT4XX ||
4530 basic_errno == ERRNO_DATA4XX)
4532 int code = (more_errno >> 8) & 255;
4534 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4535 else if (code > 100)
4536 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4540 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4541 printf("No retry information found\n");
4545 more_errno = yield->more_errno;
4546 printf("Retry rule: %s ", yield->pattern);
4548 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4550 printf("quota%s%s ",
4551 (more_errno > 0)? "_" : "",
4552 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4554 else if (yield->basic_errno == ECONNREFUSED)
4556 printf("refused%s%s ",
4557 (more_errno > 0)? "_" : "",
4558 (more_errno == 'M')? "MX" :
4559 (more_errno == 'A')? "A" : "");
4561 else if (yield->basic_errno == ETIMEDOUT)
4564 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4566 if (more_errno != 0) printf("_%s",
4567 (more_errno == 'M')? "MX" : "A");
4570 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4571 printf("auth_failed ");
4574 for (r = yield->rules; r; r = r->next)
4576 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4577 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4583 printf(",%d.", x/1000);
4597 exim_exit(EXIT_SUCCESS);
4600 /* Handle a request to list one or more configuration options */
4601 /* If -n was set, we suppress some information */
4605 set_process_info("listing variables");
4606 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4607 else for (i = recipients_arg; i < argc; i++)
4610 (Ustrcmp(argv[i], "router") == 0 ||
4611 Ustrcmp(argv[i], "transport") == 0 ||
4612 Ustrcmp(argv[i], "authenticator") == 0 ||
4613 Ustrcmp(argv[i], "macro") == 0 ||
4614 Ustrcmp(argv[i], "environment") == 0))
4616 readconf_print(argv[i+1], argv[i], flag_n);
4619 else readconf_print(argv[i], NULL, flag_n);
4621 exim_exit(EXIT_SUCCESS);
4626 set_process_info("listing config");
4627 readconf_print(US"config", NULL, flag_n);
4628 exim_exit(EXIT_SUCCESS);
4632 /* Initialise subsystems as required */
4633 #ifndef DISABLE_DKIM
4639 /* Handle a request to deliver one or more messages that are already on the
4640 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4641 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4643 Delivery of specific messages is typically used for a small number when
4644 prodding by hand (when the option forced_delivery will be set) or when
4645 re-execing to regain root privilege. Each message delivery must happen in a
4646 separate process, so we fork a process for each one, and run them sequentially
4647 so that debugging output doesn't get intertwined, and to avoid spawning too
4648 many processes if a long list is given. However, don't fork for the last one;
4649 this saves a process in the common case when Exim is called to deliver just one
4652 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4654 if (prod_requires_admin && !admin_user)
4656 fprintf(stderr, "exim: Permission denied\n");
4657 exim_exit(EXIT_FAILURE);
4659 set_process_info("delivering specified messages");
4660 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4661 for (i = msg_action_arg; i < argc; i++)
4666 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4667 else if ((pid = fork()) == 0)
4669 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4670 _exit(EXIT_SUCCESS);
4674 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4676 exim_exit(EXIT_FAILURE);
4680 exim_exit(EXIT_SUCCESS);
4684 /* If only a single queue run is requested, without SMTP listening, we can just
4685 turn into a queue runner, with an optional starting message id. */
4687 if (queue_interval == 0 && !daemon_listen)
4689 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4690 (start_queue_run_id == NULL)? US"" : US" starting at ",
4691 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4692 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4693 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4695 set_process_info("running the '%s' queue (single queue run)", queue_name);
4697 set_process_info("running the queue (single queue run)");
4698 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4699 exim_exit(EXIT_SUCCESS);
4703 /* Find the login name of the real user running this process. This is always
4704 needed when receiving a message, because it is written into the spool file. It
4705 may also be used to construct a from: or a sender: header, and in this case we
4706 need the user's full name as well, so save a copy of it, checked for RFC822
4707 syntax and munged if necessary, if it hasn't previously been set by the -F
4708 argument. We may try to get the passwd entry more than once, in case NIS or
4709 other delays are in evidence. Save the home directory for use in filter testing
4714 if ((pw = getpwuid(real_uid)) != NULL)
4716 originator_login = string_copy(US pw->pw_name);
4717 originator_home = string_copy(US pw->pw_dir);
4719 /* If user name has not been set by -F, set it from the passwd entry
4720 unless -f has been used to set the sender address by a trusted user. */
4722 if (originator_name == NULL)
4724 if (sender_address == NULL ||
4725 (!trusted_caller && filter_test == FTEST_NONE))
4727 uschar *name = US pw->pw_gecos;
4728 uschar *amp = Ustrchr(name, '&');
4731 /* Most Unix specify that a '&' character in the gecos field is
4732 replaced by a copy of the login name, and some even specify that
4733 the first character should be upper cased, so that's what we do. */
4738 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4739 amp - name, name, &loffset, originator_login, amp + 1);
4740 buffer[loffset] = toupper(buffer[loffset]);
4744 /* If a pattern for matching the gecos field was supplied, apply
4745 it and then expand the name string. */
4747 if (gecos_pattern != NULL && gecos_name != NULL)
4750 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4752 if (regex_match_and_setup(re, name, 0, -1))
4754 uschar *new_name = expand_string(gecos_name);
4756 if (new_name != NULL)
4758 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4759 "gecos field \"%s\"\n", new_name, name);
4762 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4763 "\"%s\": %s\n", gecos_name, expand_string_message);
4765 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4766 "gecos field \"%s\"\n", gecos_pattern, name);
4767 store_free((void *)re);
4769 originator_name = string_copy(name);
4772 /* A trusted caller has used -f but not -F */
4774 else originator_name = US"";
4777 /* Break the retry loop */
4782 if (++i > finduser_retries) break;
4786 /* If we cannot get a user login, log the incident and give up, unless the
4787 configuration specifies something to use. When running in the test harness,
4788 any setting of unknown_login overrides the actual name. */
4790 if (originator_login == NULL || running_in_test_harness)
4792 if (unknown_login != NULL)
4794 originator_login = expand_string(unknown_login);
4795 if (originator_name == NULL && unknown_username != NULL)
4796 originator_name = expand_string(unknown_username);
4797 if (originator_name == NULL) originator_name = US"";
4799 if (originator_login == NULL)
4800 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4804 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4807 originator_name = string_copy(parse_fix_phrase(originator_name,
4808 Ustrlen(originator_name), big_buffer, big_buffer_size));
4810 /* If a message is created by this call of Exim, the uid/gid of its originator
4811 are those of the caller. These values are overridden if an existing message is
4812 read in from the spool. */
4814 originator_uid = real_uid;
4815 originator_gid = real_gid;
4817 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4818 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4820 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4821 returns. We leave this till here so that the originator_ fields are available
4822 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4825 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4829 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4830 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4831 "mua_wrapper is set");
4836 /* If the sender ident has not been set (by a trusted caller) set it to
4837 the caller. This will get overwritten below for an inetd call. If a trusted
4838 caller has set it empty, unset it. */
4840 if (sender_ident == NULL) sender_ident = originator_login;
4841 else if (sender_ident[0] == 0) sender_ident = NULL;
4843 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4844 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4845 originator_* variables set. */
4847 if (test_rewrite_arg >= 0)
4849 really_exim = FALSE;
4850 if (test_rewrite_arg >= argc)
4852 printf("-brw needs an address argument\n");
4853 exim_exit(EXIT_FAILURE);
4855 rewrite_test(argv[test_rewrite_arg]);
4856 exim_exit(EXIT_SUCCESS);
4859 /* A locally-supplied message is considered to be coming from a local user
4860 unless a trusted caller supplies a sender address with -f, or is passing in the
4861 message via SMTP (inetd invocation or otherwise). */
4863 if ((sender_address == NULL && !smtp_input) ||
4864 (!trusted_caller && filter_test == FTEST_NONE))
4866 sender_local = TRUE;
4868 /* A trusted caller can supply authenticated_sender and authenticated_id
4869 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4870 defaults except when host checking. */
4872 if (authenticated_sender == NULL && !host_checking)
4873 authenticated_sender = string_sprintf("%s@%s", originator_login,
4874 qualify_domain_sender);
4875 if (authenticated_id == NULL && !host_checking)
4876 authenticated_id = originator_login;
4879 /* Trusted callers are always permitted to specify the sender address.
4880 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4881 is specified is the empty address. However, if a trusted caller does not
4882 specify a sender address for SMTP input, we leave sender_address unset. This
4883 causes the MAIL commands to be honoured. */
4885 if ((!smtp_input && sender_address == NULL) ||
4886 !receive_check_set_sender(sender_address))
4888 /* Either the caller is not permitted to set a general sender, or this is
4889 non-SMTP input and the trusted caller has not set a sender. If there is no
4890 sender, or if a sender other than <> is set, override with the originator's
4891 login (which will get qualified below), except when checking things. */
4893 if (sender_address == NULL /* No sender_address set */
4895 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4896 !checking)) /* Not running tests, including filter tests */
4898 sender_address = originator_login;
4899 sender_address_forced = FALSE;
4900 sender_address_domain = 0;
4904 /* Remember whether an untrusted caller set the sender address */
4906 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4908 /* Ensure that the sender address is fully qualified unless it is the empty
4909 address, which indicates an error message, or doesn't exist (root caller, smtp
4910 interface, no -f argument). */
4912 if (sender_address != NULL && sender_address[0] != 0 &&
4913 sender_address_domain == 0)
4914 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4915 qualify_domain_sender);
4917 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4919 /* Handle a request to verify a list of addresses, or test them for delivery.
4920 This must follow the setting of the sender address, since routers can be
4921 predicated upon the sender. If no arguments are given, read addresses from
4922 stdin. Set debug_level to at least D_v to get full output for address testing.
4925 if (verify_address_mode || address_test_mode)
4928 int flags = vopt_qualify;
4930 if (verify_address_mode)
4932 if (!verify_as_sender) flags |= vopt_is_recipient;
4933 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4938 flags |= vopt_is_recipient;
4939 debug_selector |= D_v;
4940 debug_file = stderr;
4941 debug_fd = fileno(debug_file);
4942 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4945 if (recipients_arg < argc)
4947 while (recipients_arg < argc)
4949 uschar *s = argv[recipients_arg++];
4952 BOOL finished = FALSE;
4953 uschar *ss = parse_find_address_end(s, FALSE);
4954 if (*ss == ',') *ss = 0; else finished = TRUE;
4955 test_address(s, flags, &exit_value);
4958 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4965 uschar *s = get_stdinput(NULL, NULL);
4966 if (s == NULL) break;
4967 test_address(s, flags, &exit_value);
4971 exim_exit(exit_value);
4974 /* Handle expansion checking. Either expand items on the command line, or read
4975 from stdin if there aren't any. If -Mset was specified, load the message so
4976 that its variables can be used, but restrict this facility to admin users.
4977 Otherwise, if -bem was used, read a message from stdin. */
4981 dns_init(FALSE, FALSE, FALSE);
4982 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4984 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4987 fprintf(stderr, "exim: permission denied\n");
4990 message_id = argv[msg_action_arg];
4991 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4992 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4993 printf ("Failed to load message datafile %s\n", message_id);
4994 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4995 printf ("Failed to load message %s\n", message_id);
4998 /* Read a test message from a file. We fudge it up to be on stdin, saving
4999 stdin itself for later reading of expansion strings. */
5001 else if (expansion_test_message != NULL)
5003 int save_stdin = dup(0);
5004 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5007 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5009 return EXIT_FAILURE;
5012 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5013 message_ended = END_NOTENDED;
5014 read_message_body(receive_msg(extract_recipients));
5015 message_linecount += body_linecount;
5016 (void)dup2(save_stdin, 0);
5017 (void)close(save_stdin);
5018 clearerr(stdin); /* Required by Darwin */
5021 /* Allow $recipients for this testing */
5023 enable_dollar_recipients = TRUE;
5025 /* Expand command line items */
5027 if (recipients_arg < argc)
5029 while (recipients_arg < argc)
5031 uschar *s = argv[recipients_arg++];
5032 uschar *ss = expand_string(s);
5033 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5034 else printf("%s\n", CS ss);
5042 char *(*fn_readline)(const char *) = NULL;
5043 void (*fn_addhist)(const char *) = NULL;
5046 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5052 uschar *source = get_stdinput(fn_readline, fn_addhist);
5053 if (source == NULL) break;
5054 ss = expand_string(source);
5056 printf ("Failed: %s\n", expand_string_message);
5057 else printf("%s\n", CS ss);
5061 if (dlhandle != NULL) dlclose(dlhandle);
5065 /* The data file will be open after -Mset */
5067 if (deliver_datafile >= 0)
5069 (void)close(deliver_datafile);
5070 deliver_datafile = -1;
5073 exim_exit(EXIT_SUCCESS);
5077 /* The active host name is normally the primary host name, but it can be varied
5078 for hosts that want to play several parts at once. We need to ensure that it is
5079 set for host checking, and for receiving messages. */
5081 smtp_active_hostname = primary_hostname;
5082 if (raw_active_hostname != NULL)
5084 uschar *nah = expand_string(raw_active_hostname);
5087 if (!expand_string_forcedfail)
5088 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5089 "(smtp_active_hostname): %s", raw_active_hostname,
5090 expand_string_message);
5092 else if (nah[0] != 0) smtp_active_hostname = nah;
5095 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5096 given IP address so that the blocking and relay configuration can be tested.
5097 Unless a sender_ident was set by -oMt, we discard it (the default is the
5098 caller's login name). An RFC 1413 call is made only if we are running in the
5099 test harness and an incoming interface and both ports are specified, because
5100 there is no TCP/IP call to find the ident for. */
5107 if (!sender_ident_set)
5109 sender_ident = NULL;
5110 if (running_in_test_harness && sender_host_port != 0 &&
5111 interface_address != NULL && interface_port != 0)
5112 verify_get_ident(1413);
5115 /* In case the given address is a non-canonical IPv6 address, canonicalize
5116 it. The code works for both IPv4 and IPv6, as it happens. */
5118 size = host_aton(sender_host_address, x);
5119 sender_host_address = store_get(48); /* large enough for full IPv6 */
5120 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5122 /* Now set up for testing */
5124 host_build_sender_fullhost();
5128 sender_local = FALSE;
5129 sender_host_notsocket = TRUE;
5130 debug_file = stderr;
5131 debug_fd = fileno(debug_file);
5132 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5133 "**** but without any ident (RFC 1413) callback.\n"
5134 "**** This is not for real!\n\n",
5135 sender_host_address);
5137 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5138 if (verify_check_host(&hosts_connection_nolog) == OK)
5139 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5140 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5142 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5143 because a log line has already been written for all its failure exists
5144 (usually "connection refused: <reason>") and writing another one is
5145 unnecessary clutter. */
5147 if (smtp_start_session())
5149 for (reset_point = store_get(0); ; store_reset(reset_point))
5151 if (smtp_setup_msg() <= 0) break;
5152 if (!receive_msg(FALSE)) break;
5154 return_path = sender_address = NULL;
5155 dnslist_domain = dnslist_matched = NULL;
5156 #ifndef DISABLE_DKIM
5157 dkim_cur_signer = NULL;
5160 deliver_localpart_orig = NULL;
5161 deliver_domain_orig = NULL;
5162 callout_address = sending_ip_address = NULL;
5163 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5167 exim_exit(EXIT_SUCCESS);
5171 /* Arrange for message reception if recipients or SMTP were specified;
5172 otherwise complain unless a version print (-bV) happened or this is a filter
5173 verification test or info dump.
5174 In the former case, show the configuration file name. */
5176 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5178 if (version_printed)
5180 printf("Configuration file is %s\n", config_main_filename);
5181 return EXIT_SUCCESS;
5184 if (info_flag != CMDINFO_NONE)
5186 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5187 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5190 if (filter_test == FTEST_NONE)
5191 exim_usage(called_as);
5195 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5196 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5197 that we are not called from inetd, because that is rejected above. The
5198 following configuration settings are forced here:
5200 (1) Synchronous delivery (-odi)
5201 (2) Errors to stderr (-oep == -oeq)
5202 (3) No parallel remote delivery
5203 (4) Unprivileged delivery
5205 We don't force overall queueing options because there are several of them;
5206 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5207 to override any SMTP queueing. */
5211 synchronous_delivery = TRUE;
5212 arg_error_handling = ERRORS_STDERR;
5213 remote_max_parallel = 1;
5214 deliver_drop_privilege = TRUE;
5216 queue_smtp_domains = NULL;
5218 message_utf8_downconvert = -1; /* convert-if-needed */
5223 /* Prepare to accept one or more new messages on the standard input. When a
5224 message has been read, its id is returned in message_id[]. If doing immediate
5225 delivery, we fork a delivery process for each received message, except for the
5226 last one, where we can save a process switch.
5228 It is only in non-smtp mode that error_handling is allowed to be changed from
5229 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5230 sendmail error modes other than -oem ever actually used? Later: yes.) */
5232 if (!smtp_input) error_handling = arg_error_handling;
5234 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5235 logging being sent down the socket and make an identd call to get the
5240 (void)fclose(stderr);
5241 exim_nullstd(); /* Re-open to /dev/null */
5242 verify_get_ident(IDENT_PORT);
5243 host_build_sender_fullhost();
5244 set_process_info("handling incoming connection from %s via inetd",
5248 /* If the sender host address has been set, build sender_fullhost if it hasn't
5249 already been done (which it will have been for inetd). This caters for the
5250 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5251 so that the test for IP options is skipped for -bs input. */
5253 if (sender_host_address != NULL && sender_fullhost == NULL)
5255 host_build_sender_fullhost();
5256 set_process_info("handling incoming connection from %s via -oMa",
5258 sender_host_notsocket = TRUE;
5261 /* Otherwise, set the sender host as unknown except for inetd calls. This
5262 prevents host checking in the case of -bs not from inetd and also for -bS. */
5264 else if (!is_inetd) sender_host_unknown = TRUE;
5266 /* If stdout does not exist, then dup stdin to stdout. This can happen
5267 if exim is started from inetd. In this case fd 0 will be set to the socket,
5268 but fd 1 will not be set. This also happens for passed SMTP channels. */
5270 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5272 /* Set up the incoming protocol name and the state of the program. Root is
5273 allowed to force received protocol via the -oMr option above. If we have come
5274 via inetd, the process info has already been set up. We don't set
5275 received_protocol here for smtp input, as it varies according to
5276 batch/HELO/EHLO/AUTH/TLS. */
5280 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5281 smtp_batched_input? "batched " : "",
5282 (sender_address!= NULL)? sender_address : originator_login);
5286 int old_pool = store_pool;
5287 store_pool = POOL_PERM;
5288 if (!received_protocol)
5289 received_protocol = string_sprintf("local%s", called_as);
5290 store_pool = old_pool;
5291 set_process_info("accepting a local non-SMTP message from <%s>",
5295 /* Initialize the session_local_queue-only flag (this will be ignored if
5296 mua_wrapper is set) */
5299 session_local_queue_only = queue_only;
5301 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5302 the spool if so configured. On failure, we must not attempt to send an error
5303 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5304 error code is given.) */
5306 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5308 fprintf(stderr, "exim: insufficient disk space\n");
5309 return EXIT_FAILURE;
5312 /* If this is smtp input of any kind, real or batched, handle the start of the
5315 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5316 because a log line has already been written for all its failure exists
5317 (usually "connection refused: <reason>") and writing another one is
5318 unnecessary clutter. */
5324 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5325 if (verify_check_host(&hosts_connection_nolog) == OK)
5326 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5327 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5328 if (!smtp_start_session())
5331 exim_exit(EXIT_SUCCESS);
5335 /* Otherwise, set up the input size limit here. */
5339 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5340 if (expand_string_message)
5341 if (thismessage_size_limit == -1)
5342 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5343 "message_size_limit: %s", expand_string_message);
5345 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5346 "message_size_limit: %s", expand_string_message);
5349 /* Loop for several messages when reading SMTP input. If we fork any child
5350 processes, we don't want to wait for them unless synchronous delivery is
5351 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5352 same as SIG_DFL, despite the fact that documentation often lists the default as
5353 "ignore". This is a confusing area. This is what I know:
5355 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5356 processes that complete simply to go away without ever becoming defunct. You
5357 can't then wait for them - but we don't want to wait for them in the
5358 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5359 happen for all OS (e.g. *BSD is different).
5361 But that's not the end of the story. Some (many? all?) systems have the
5362 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5363 has by default, so it seems that the difference is merely one of default
5364 (compare restarting vs non-restarting signals).
5366 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5367 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5368 of the loop below. Paranoia rules.
5370 February 2003: That's *still* not the end of the story. There are now versions
5371 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5372 process then calls waitpid(), a grumble is written to the system log, because
5373 this is logically inconsistent. In other words, it doesn't like the paranoia.
5374 As a consequence of this, the waitpid() below is now excluded if we are sure
5375 that SIG_IGN works. */
5377 if (!synchronous_delivery)
5380 struct sigaction act;
5381 act.sa_handler = SIG_IGN;
5382 sigemptyset(&(act.sa_mask));
5383 act.sa_flags = SA_NOCLDWAIT;
5384 sigaction(SIGCHLD, &act, NULL);
5386 signal(SIGCHLD, SIG_IGN);
5390 /* Save the current store pool point, for resetting at the start of
5391 each message, and save the real sender address, if any. */
5393 reset_point = store_get(0);
5394 real_sender_address = sender_address;
5396 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5397 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5404 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5405 input and build the recipients list, before calling receive_msg() to read the
5406 message proper. Whatever sender address is given in the SMTP transaction is
5407 often ignored for local senders - we use the actual sender, which is normally
5408 either the underlying user running this process or a -f argument provided by
5409 a trusted caller. It is saved in real_sender_address. The test for whether to
5410 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5415 if ((rc = smtp_setup_msg()) > 0)
5417 if (real_sender_address != NULL &&
5418 !receive_check_set_sender(sender_address))
5420 sender_address = raw_sender = real_sender_address;
5421 sender_address_unrewritten = NULL;
5424 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5425 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5426 the very end. The result of the ACL is ignored (as for other non-SMTP
5427 messages). It is run for its potential side effects. */
5429 if (smtp_batched_input && acl_not_smtp_start != NULL)
5431 uschar *user_msg, *log_msg;
5432 enable_dollar_recipients = TRUE;
5433 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5434 &user_msg, &log_msg);
5435 enable_dollar_recipients = FALSE;
5438 /* Now get the data for the message */
5440 more = receive_msg(extract_recipients);
5441 if (message_id[0] == 0)
5443 cancel_cutthrough_connection(TRUE, US"receive dropped");
5444 if (more) goto moreloop;
5445 smtp_log_no_mail(); /* Log no mail if configured */
5446 exim_exit(EXIT_FAILURE);
5451 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5452 smtp_log_no_mail(); /* Log no mail if configured */
5453 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5457 /* In the non-SMTP case, we have all the information from the command
5458 line, but must process it in case it is in the more general RFC822
5459 format, and in any case, to detect syntax errors. Also, it appears that
5460 the use of comma-separated lists as single arguments is common, so we
5461 had better support them. */
5467 int count = argc - recipients_arg;
5468 uschar **list = argv + recipients_arg;
5470 /* These options cannot be changed dynamically for non-SMTP messages */
5472 active_local_sender_retain = local_sender_retain;
5473 active_local_from_check = local_from_check;
5475 /* Save before any rewriting */
5477 raw_sender = string_copy(sender_address);
5479 /* Loop for each argument */
5481 for (i = 0; i < count; i++)
5483 int start, end, domain;
5485 uschar *s = list[i];
5487 /* Loop for each comma-separated address */
5491 BOOL finished = FALSE;
5493 uschar *ss = parse_find_address_end(s, FALSE);
5495 if (*ss == ',') *ss = 0; else finished = TRUE;
5497 /* Check max recipients - if -t was used, these aren't recipients */
5499 if (recipients_max > 0 && ++rcount > recipients_max &&
5500 !extract_recipients)
5501 if (error_handling == ERRORS_STDERR)
5503 fprintf(stderr, "exim: too many recipients\n");
5504 exim_exit(EXIT_FAILURE);
5509 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5510 errors_sender_rc : EXIT_FAILURE;
5515 BOOL b = allow_utf8_domains;
5516 allow_utf8_domains = TRUE;
5519 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5522 if (string_is_utf8(recipient))
5523 message_smtputf8 = TRUE;
5525 allow_utf8_domains = b;
5528 if (domain == 0 && !allow_unqualified_recipient)
5531 errmess = US"unqualified recipient address not allowed";
5534 if (recipient == NULL)
5536 if (error_handling == ERRORS_STDERR)
5538 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5539 string_printing(list[i]), errmess);
5540 exim_exit(EXIT_FAILURE);
5546 eblock.text1 = string_printing(list[i]);
5547 eblock.text2 = errmess;
5549 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5550 errors_sender_rc : EXIT_FAILURE;
5554 receive_add_recipient(recipient, -1);
5557 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5561 /* Show the recipients when debugging */
5566 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5567 if (recipients_list != NULL)
5569 debug_printf("Recipients:\n");
5570 for (i = 0; i < recipients_count; i++)
5571 debug_printf(" %s\n", recipients_list[i].address);
5575 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5576 ignored; rejecting here would just add complication, and it can just as
5577 well be done later. Allow $recipients to be visible in the ACL. */
5579 if (acl_not_smtp_start)
5581 uschar *user_msg, *log_msg;
5582 enable_dollar_recipients = TRUE;
5583 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5584 &user_msg, &log_msg);
5585 enable_dollar_recipients = FALSE;
5588 /* Pause for a while waiting for input. If none received in that time,
5589 close the logfile, if we had one open; then if we wait for a long-running
5590 datasource (months, in one use-case) log rotation will not leave us holding
5593 if (!receive_timeout)
5595 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5598 FD_ZERO(&r); FD_SET(0, &r);
5599 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5602 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5603 will just read the headers for the message, and not write anything onto the
5606 message_ended = END_NOTENDED;
5607 more = receive_msg(extract_recipients);
5609 /* more is always FALSE here (not SMTP message) when reading a message
5610 for real; when reading the headers of a message for filter testing,
5611 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5613 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5614 } /* Non-SMTP message reception */
5616 /* If this is a filter testing run, there are headers in store, but
5617 no message on the spool. Run the filtering code in testing mode, setting
5618 the domain to the qualify domain and the local part to the current user,
5619 unless they have been set by options. The prefix and suffix are left unset
5620 unless specified. The the return path is set to to the sender unless it has
5621 already been set from a return-path header in the message. */
5623 if (filter_test != FTEST_NONE)
5625 deliver_domain = (ftest_domain != NULL)?
5626 ftest_domain : qualify_domain_recipient;
5627 deliver_domain_orig = deliver_domain;
5628 deliver_localpart = (ftest_localpart != NULL)?
5629 ftest_localpart : originator_login;
5630 deliver_localpart_orig = deliver_localpart;
5631 deliver_localpart_prefix = ftest_prefix;
5632 deliver_localpart_suffix = ftest_suffix;
5633 deliver_home = originator_home;
5635 if (return_path == NULL)
5637 printf("Return-path copied from sender\n");
5638 return_path = string_copy(sender_address);
5641 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5642 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5644 receive_add_recipient(
5645 string_sprintf("%s%s%s@%s",
5646 (ftest_prefix == NULL)? US"" : ftest_prefix,
5648 (ftest_suffix == NULL)? US"" : ftest_suffix,
5649 deliver_domain), -1);
5651 printf("Recipient = %s\n", recipients_list[0].address);
5652 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5653 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5655 if (chdir("/")) /* Get away from wherever the user is running this from */
5657 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5658 exim_exit(EXIT_FAILURE);
5661 /* Now we run either a system filter test, or a user filter test, or both.
5662 In the latter case, headers added by the system filter will persist and be
5663 available to the user filter. We need to copy the filter variables
5666 if ((filter_test & FTEST_SYSTEM) != 0)
5668 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5669 exim_exit(EXIT_FAILURE);
5672 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5674 if ((filter_test & FTEST_USER) != 0)
5676 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5677 exim_exit(EXIT_FAILURE);
5680 exim_exit(EXIT_SUCCESS);
5683 /* Else act on the result of message reception. We should not get here unless
5684 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5685 will be TRUE. If it is not, check on the number of messages received in this
5688 if (!session_local_queue_only &&
5689 smtp_accept_queue_per_connection > 0 &&
5690 receive_messagecount > smtp_accept_queue_per_connection)
5692 session_local_queue_only = TRUE;
5693 queue_only_reason = 2;
5696 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5697 and queue_only_load is set, check that the load average is below it. If it is
5698 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5699 default), we put the whole session into queue_only mode. It then remains this
5700 way for any subsequent messages on the same SMTP connection. This is a
5701 deliberate choice; even though the load average may fall, it doesn't seem
5702 right to deliver later messages on the same call when not delivering earlier
5703 ones. However, there are odd cases where this is not wanted, so this can be
5704 changed by setting queue_only_load_latch false. */
5706 local_queue_only = session_local_queue_only;
5707 if (!local_queue_only && queue_only_load >= 0)
5709 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5710 if (local_queue_only)
5712 queue_only_reason = 3;
5713 if (queue_only_load_latch) session_local_queue_only = TRUE;
5717 /* If running as an MUA wrapper, all queueing options and freezing options
5721 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5723 /* Log the queueing here, when it will get a message id attached, but
5724 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5727 if (local_queue_only)
5729 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5730 switch(queue_only_reason)
5733 log_write(L_delay_delivery,
5734 LOG_MAIN, "no immediate delivery: more than %d messages "
5735 "received in one connection", smtp_accept_queue_per_connection);
5739 log_write(L_delay_delivery,
5740 LOG_MAIN, "no immediate delivery: load average %.2f",
5741 (double)load_average/1000.0);
5746 else if (queue_only_policy || deliver_freeze)
5747 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5749 /* Else do the delivery unless the ACL or local_scan() called for queue only
5750 or froze the message. Always deliver in a separate process. A fork failure is
5751 not a disaster, as the delivery will eventually happen on a subsequent queue
5752 run. The search cache must be tidied before the fork, as the parent will
5753 do it before exiting. The child will trigger a lookup failure and
5754 thereby defer the delivery if it tries to use (for example) a cached ldap
5755 connection that the parent has called unbind on. */
5762 if ((pid = fork()) == 0)
5765 close_unwanted(); /* Close unwanted file descriptors and TLS */
5766 exim_nullstd(); /* Ensure std{in,out,err} exist */
5768 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5769 mode, deliver_drop_privilege is forced TRUE). */
5771 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5773 delivery_re_exec(CEE_EXEC_EXIT);
5774 /* Control does not return here. */
5777 /* No need to re-exec */
5779 rc = deliver_message(message_id, FALSE, FALSE);
5781 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5782 EXIT_SUCCESS : EXIT_FAILURE);
5787 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5788 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5789 "process: %s", strerror(errno));
5793 release_cutthrough_connection(US"msg passed for delivery");
5795 /* In the parent, wait if synchronous delivery is required. This will
5796 always be the case in MUA wrapper mode. */
5798 if (synchronous_delivery)
5801 while (wait(&status) != pid);
5802 if ((status & 0x00ff) != 0)
5803 log_write(0, LOG_MAIN|LOG_PANIC,
5804 "process %d crashed with signal %d while delivering %s",
5805 (int)pid, status & 0x00ff, message_id);
5806 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5811 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5812 automatically reaps children (see comments above the loop), clear away any
5813 finished subprocesses here, in case there are lots of messages coming in
5814 from the same source. */
5816 #ifndef SIG_IGN_WORKS
5817 while (waitpid(-1, NULL, WNOHANG) > 0);
5821 return_path = sender_address = NULL;
5822 authenticated_sender = NULL;
5823 deliver_localpart_orig = NULL;
5824 deliver_domain_orig = NULL;
5825 deliver_host = deliver_host_address = NULL;
5826 dnslist_domain = dnslist_matched = NULL;
5827 #ifdef WITH_CONTENT_SCAN
5828 malware_name = NULL;
5830 callout_address = NULL;
5831 sending_ip_address = NULL;
5833 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5835 store_reset(reset_point);
5838 exim_exit(EXIT_SUCCESS); /* Never returns */
5839 return 0; /* To stop compiler warning */
5842 /*************************************************
5843 * read as much as requested *
5844 *************************************************/
5846 /* The syscall read(2) doesn't always returns as much as we want. For
5847 several reasons it might get less. (Not talking about signals, as syscalls
5848 are restartable). When reading from a network or pipe connection the sender
5849 might send in smaller chunks, with delays between these chunks. The read(2)
5850 may return such a chunk.
5852 The more the writer writes and the smaller the pipe between write and read is,
5853 the more we get the chance of reading leass than requested. (See bug 2130)
5855 This function read(2)s until we got all the data we *requested*.
5857 Note: This function may block. Use it only if you're sure about the
5858 amount of data you will get.
5861 fd the file descriptor to read from
5862 buffer pointer to a buffer of size len
5863 len the requested(!) amount of bytes
5865 Returns: the amount of bytes read
5868 readn(int fd, void *buffer, size_t len)
5870 void *next = buffer;
5871 void *end = buffer + len;
5875 ssize_t got = read(fd, next, end - next);
5877 /* I'm not sure if there are signals that can interrupt us,
5878 for now I assume the worst */
5879 if (got == -1 && errno == EINTR) continue;
5880 if (got <= 0) return next - buffer;