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");
844 if (tcp_fastopen_ok) fprintf(f, " TCP_Fast_Open");
846 #ifdef EXPERIMENTAL_LMDB
847 fprintf(f, " Experimental_LMDB");
849 #ifdef EXPERIMENTAL_QUEUEFILE
850 fprintf(f, " Experimental_QUEUEFILE");
852 #ifdef EXPERIMENTAL_SPF
853 fprintf(f, " Experimental_SPF");
855 #ifdef EXPERIMENTAL_SRS
856 fprintf(f, " Experimental_SRS");
858 #ifdef EXPERIMENTAL_BRIGHTMAIL
859 fprintf(f, " Experimental_Brightmail");
861 #ifdef EXPERIMENTAL_DANE
862 fprintf(f, " Experimental_DANE");
864 #ifdef EXPERIMENTAL_DCC
865 fprintf(f, " Experimental_DCC");
867 #ifdef EXPERIMENTAL_DMARC
868 fprintf(f, " Experimental_DMARC");
870 #ifdef EXPERIMENTAL_DSN_INFO
871 fprintf(f, " Experimental_DSN_info");
875 fprintf(f, "Lookups (built-in):");
876 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
877 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
879 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
882 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
883 fprintf(f, " dbm dbmjz dbmnz");
885 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
886 fprintf(f, " dnsdb");
888 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
889 fprintf(f, " dsearch");
891 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
892 fprintf(f, " ibase");
894 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
895 fprintf(f, " ldap ldapdn ldapm");
897 #ifdef EXPERIMENTAL_LMDB
900 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
901 fprintf(f, " mysql");
903 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
904 fprintf(f, " nis nis0");
906 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
907 fprintf(f, " nisplus");
909 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
910 fprintf(f, " oracle");
912 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
913 fprintf(f, " passwd");
915 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
916 fprintf(f, " pgsql");
918 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
919 fprintf(f, " redis");
921 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
922 fprintf(f, " sqlite");
924 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
925 fprintf(f, " testdb");
927 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
928 fprintf(f, " whoson");
932 fprintf(f, "Authenticators:");
934 fprintf(f, " cram_md5");
936 #ifdef AUTH_CYRUS_SASL
937 fprintf(f, " cyrus_sasl");
940 fprintf(f, " dovecot");
943 fprintf(f, " gsasl");
945 #ifdef AUTH_HEIMDAL_GSSAPI
946 fprintf(f, " heimdal_gssapi");
948 #ifdef AUTH_PLAINTEXT
949 fprintf(f, " plaintext");
959 fprintf(f, "Routers:");
961 fprintf(f, " accept");
963 #ifdef ROUTER_DNSLOOKUP
964 fprintf(f, " dnslookup");
966 #ifdef ROUTER_IPLITERAL
967 fprintf(f, " ipliteral");
969 #ifdef ROUTER_IPLOOKUP
970 fprintf(f, " iplookup");
972 #ifdef ROUTER_MANUALROUTE
973 fprintf(f, " manualroute");
975 #ifdef ROUTER_QUERYPROGRAM
976 fprintf(f, " queryprogram");
978 #ifdef ROUTER_REDIRECT
979 fprintf(f, " redirect");
983 fprintf(f, "Transports:");
984 #ifdef TRANSPORT_APPENDFILE
985 fprintf(f, " appendfile");
986 #ifdef SUPPORT_MAILDIR
987 fprintf(f, "/maildir");
989 #ifdef SUPPORT_MAILSTORE
990 fprintf(f, "/mailstore");
996 #ifdef TRANSPORT_AUTOREPLY
997 fprintf(f, " autoreply");
999 #ifdef TRANSPORT_LMTP
1000 fprintf(f, " lmtp");
1002 #ifdef TRANSPORT_PIPE
1003 fprintf(f, " pipe");
1005 #ifdef EXPERIMENTAL_QUEUEFILE
1006 fprintf(f, " queuefile");
1008 #ifdef TRANSPORT_SMTP
1009 fprintf(f, " smtp");
1013 if (fixed_never_users[0] > 0)
1016 fprintf(f, "Fixed never_users: ");
1017 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1018 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1019 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1022 fprintf(f, "Configure owner: %d:%d\n", config_uid, config_gid);
1024 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1026 /* Everything else is details which are only worth reporting when debugging.
1027 Perhaps the tls_version_report should move into this too. */
1032 /* clang defines __GNUC__ (at least, for me) so test for it first */
1033 #if defined(__clang__)
1034 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1035 #elif defined(__GNUC__)
1036 fprintf(f, "Compiler: GCC [%s]\n",
1040 "? unknown version ?"
1044 fprintf(f, "Compiler: <unknown>\n");
1047 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1048 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1049 __GLIBC__, __GLIBC_MINOR__);
1050 if (__GLIBC_PREREQ(2, 1))
1051 fprintf(f, " Runtime: %s\n",
1052 gnu_get_libc_version());
1056 tls_version_report(f);
1059 utf8_version_report(f);
1062 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1063 if (authi->version_report)
1064 (*authi->version_report)(f);
1066 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1067 characters; unless it's an ancient version of PCRE in which case it
1069 #ifndef PCRE_PRERELEASE
1070 # define PCRE_PRERELEASE
1073 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1074 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1076 PCRE_MAJOR, PCRE_MINOR,
1077 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1080 #undef EXPAND_AND_QUOTE
1083 for (i = 0; i < lookup_list_count; i++)
1084 if (lookup_list[i]->version_report)
1085 lookup_list[i]->version_report(f);
1087 #ifdef WHITELIST_D_MACROS
1088 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1090 fprintf(f, "WHITELIST_D_MACROS unset\n");
1092 #ifdef TRUSTED_CONFIG_LIST
1093 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1095 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1102 /*************************************************
1103 * Show auxiliary information about Exim *
1104 *************************************************/
1107 show_exim_information(enum commandline_info request, FILE *stream)
1114 fprintf(stream, "Oops, something went wrong.\n");
1118 "The -bI: flag takes a string indicating which information to provide.\n"
1119 "If the string is not recognised, you'll get this help (on stderr).\n"
1121 " exim -bI:help this information\n"
1122 " exim -bI:dscp dscp value keywords known\n"
1123 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1127 for (pp = exim_sieve_extension_list; *pp; ++pp)
1128 fprintf(stream, "%s\n", *pp);
1131 dscp_list_to_stream(stream);
1137 /*************************************************
1138 * Quote a local part *
1139 *************************************************/
1141 /* This function is used when a sender address or a From: or Sender: header
1142 line is being created from the caller's login, or from an authenticated_id. It
1143 applies appropriate quoting rules for a local part.
1145 Argument: the local part
1146 Returns: the local part, quoted if necessary
1150 local_part_quote(uschar *lpart)
1152 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;
1164 g = string_catn(NULL, US"\"", 1);
1168 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1171 g = string_cat(g, lpart);
1174 g = string_catn(g, lpart, nq - lpart);
1175 g = string_catn(g, US"\\", 1);
1176 g = string_catn(g, nq, 1);
1180 g = string_catn(g, US"\"", 1);
1181 return string_from_gstring(g);
1187 /*************************************************
1188 * Load readline() functions *
1189 *************************************************/
1191 /* This function is called from testing executions that read data from stdin,
1192 but only when running as the calling user. Currently, only -be does this. The
1193 function loads the readline() function library and passes back the functions.
1194 On some systems, it needs the curses library, so load that too, but try without
1195 it if loading fails. All this functionality has to be requested at build time.
1198 fn_readline_ptr pointer to where to put the readline pointer
1199 fn_addhist_ptr pointer to where to put the addhistory function
1201 Returns: the dlopen handle or NULL on failure
1205 set_readline(char * (**fn_readline_ptr)(const char *),
1206 void (**fn_addhist_ptr)(const char *))
1209 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1211 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1212 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1214 if (dlhandle != NULL)
1216 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1217 * char * readline (const char *prompt);
1218 * void add_history (const char *string);
1220 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1221 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1225 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1234 /*************************************************
1235 * Get a line from stdin for testing things *
1236 *************************************************/
1238 /* This function is called when running tests that can take a number of lines
1239 of input (for example, -be and -bt). It handles continuations and trailing
1240 spaces. And prompting and a blank line output on eof. If readline() is in use,
1241 the arguments are non-NULL and provide the relevant functions.
1244 fn_readline readline function or NULL
1245 fn_addhist addhist function or NULL
1247 Returns: pointer to dynamic memory, or NULL at end of file
1251 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1256 if (!fn_readline) { printf("> "); fflush(stdout); }
1260 uschar buffer[1024];
1264 char *readline_line = NULL;
1265 if (fn_readline != NULL)
1267 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1268 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1269 p = US readline_line;
1274 /* readline() not in use */
1277 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1281 /* Handle the line */
1283 ss = p + (int)Ustrlen(p);
1284 while (ss > p && isspace(ss[-1])) ss--;
1288 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1291 g = string_catn(g, p, ss - p);
1294 if (fn_readline) free(readline_line);
1297 /* g can only be NULL if ss==p */
1298 if (ss == p || g->s[g->ptr-1] != '\\')
1302 (void) string_from_gstring(g);
1305 if (!g) printf("\n");
1306 return string_from_gstring(g);
1311 /*************************************************
1312 * Output usage information for the program *
1313 *************************************************/
1315 /* This function is called when there are no recipients
1316 or a specific --help argument was added.
1319 progname information on what name we were called by
1321 Returns: DOES NOT RETURN
1325 exim_usage(uschar *progname)
1328 /* Handle specific program invocation variants */
1329 if (Ustrcmp(progname, US"-mailq") == 0)
1332 "mailq - list the contents of the mail queue\n\n"
1333 "For a list of options, see the Exim documentation.\n");
1337 /* Generic usage - we output this whatever happens */
1339 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1340 "not directly from a shell command line. Options and/or arguments control\n"
1341 "what it does when called. For a list of options, see the Exim documentation.\n");
1348 /*************************************************
1349 * Validate that the macros given are okay *
1350 *************************************************/
1352 /* Typically, Exim will drop privileges if macros are supplied. In some
1353 cases, we want to not do so.
1355 Arguments: opt_D_used - true if the commandline had a "-D" option
1356 Returns: true if trusted, false otherwise
1360 macros_trusted(BOOL opt_D_used)
1362 #ifdef WHITELIST_D_MACROS
1364 uschar *whitelisted, *end, *p, **whites, **w;
1365 int white_count, i, n;
1367 BOOL prev_char_item, found;
1372 #ifndef WHITELIST_D_MACROS
1376 /* We only trust -D overrides for some invoking users:
1377 root, the exim run-time user, the optional config owner user.
1378 I don't know why config-owner would be needed, but since they can own the
1379 config files anyway, there's no security risk to letting them override -D. */
1380 if ( ! ((real_uid == root_uid)
1381 || (real_uid == exim_uid)
1382 #ifdef CONFIGURE_OWNER
1383 || (real_uid == config_uid)
1387 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1391 /* Get a list of macros which are whitelisted */
1392 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1393 prev_char_item = FALSE;
1395 for (p = whitelisted; *p != '\0'; ++p)
1397 if (*p == ':' || isspace(*p))
1402 prev_char_item = FALSE;
1405 if (!prev_char_item)
1406 prev_char_item = TRUE;
1413 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1414 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1419 if (i == white_count)
1421 while (*p != '\0' && p < end)
1427 /* The list of commandline macros should be very short.
1428 Accept the N*M complexity. */
1429 for (m = macros; m; m = m->next) if (m->command_line)
1432 for (w = whites; *w; ++w)
1433 if (Ustrcmp(*w, m->name) == 0)
1440 if (!m->replacement)
1442 if ((len = m->replen) == 0)
1444 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1445 0, PCRE_EOPT, NULL, 0);
1448 if (n != PCRE_ERROR_NOMATCH)
1449 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1453 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1459 /*************************************************
1460 * Entry point and high-level code *
1461 *************************************************/
1463 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1464 the appropriate action. All the necessary functions are present in the one
1465 binary. I originally thought one should split it up, but it turns out that so
1466 much of the apparatus is needed in each chunk that one might as well just have
1467 it all available all the time, which then makes the coding easier as well.
1470 argc count of entries in argv
1471 argv argument strings, with argv[0] being the program name
1473 Returns: EXIT_SUCCESS if terminated successfully
1474 EXIT_FAILURE otherwise, except when a message has been sent
1475 to the sender, and -oee was given
1479 main(int argc, char **cargv)
1481 uschar **argv = USS cargv;
1482 int arg_receive_timeout = -1;
1483 int arg_smtp_receive_timeout = -1;
1484 int arg_error_handling = error_handling;
1485 int filter_sfd = -1;
1486 int filter_ufd = -1;
1489 int list_queue_option = 0;
1491 int msg_action_arg = -1;
1492 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1493 int queue_only_reason = 0;
1495 int perl_start_option = 0;
1497 int recipients_arg = argc;
1498 int sender_address_domain = 0;
1499 int test_retry_arg = -1;
1500 int test_rewrite_arg = -1;
1501 BOOL arg_queue_only = FALSE;
1502 BOOL bi_option = FALSE;
1503 BOOL checking = FALSE;
1504 BOOL count_queue = FALSE;
1505 BOOL expansion_test = FALSE;
1506 BOOL extract_recipients = FALSE;
1507 BOOL flag_G = FALSE;
1508 BOOL flag_n = FALSE;
1509 BOOL forced_delivery = FALSE;
1510 BOOL f_end_dot = FALSE;
1511 BOOL deliver_give_up = FALSE;
1512 BOOL list_queue = FALSE;
1513 BOOL list_options = FALSE;
1514 BOOL list_config = FALSE;
1515 BOOL local_queue_only;
1517 BOOL one_msg_action = FALSE;
1518 BOOL opt_D_used = FALSE;
1519 BOOL queue_only_set = FALSE;
1520 BOOL receiving_message = TRUE;
1521 BOOL sender_ident_set = FALSE;
1522 BOOL session_local_queue_only;
1524 BOOL removed_privilege = FALSE;
1525 BOOL usage_wanted = FALSE;
1526 BOOL verify_address_mode = FALSE;
1527 BOOL verify_as_sender = FALSE;
1528 BOOL version_printed = FALSE;
1529 uschar *alias_arg = NULL;
1530 uschar *called_as = US"";
1531 uschar *cmdline_syslog_name = NULL;
1532 uschar *start_queue_run_id = NULL;
1533 uschar *stop_queue_run_id = NULL;
1534 uschar *expansion_test_message = NULL;
1535 uschar *ftest_domain = NULL;
1536 uschar *ftest_localpart = NULL;
1537 uschar *ftest_prefix = NULL;
1538 uschar *ftest_suffix = NULL;
1539 uschar *log_oneline = NULL;
1540 uschar *malware_test_file = NULL;
1541 uschar *real_sender_address;
1542 uschar *originator_home = US"/";
1547 struct stat statbuf;
1548 pid_t passed_qr_pid = (pid_t)0;
1549 int passed_qr_pipe = -1;
1550 gid_t group_list[NGROUPS_MAX];
1552 /* For the -bI: flag */
1553 enum commandline_info info_flag = CMDINFO_NONE;
1554 BOOL info_stdout = FALSE;
1556 /* Possible options for -R and -S */
1558 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1560 /* Need to define this in case we need to change the environment in order
1561 to get rid of a bogus time zone. We have to make it char rather than uschar
1562 because some OS define it in /usr/include/unistd.h. */
1564 extern char **environ;
1566 /* If the Exim user and/or group and/or the configuration file owner/group were
1567 defined by ref:name at build time, we must now find the actual uid/gid values.
1568 This is a feature to make the lives of binary distributors easier. */
1570 #ifdef EXIM_USERNAME
1571 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1575 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1579 /* If ref:name uses a number as the name, route_finduser() returns
1580 TRUE with exim_uid set and pw coerced to NULL. */
1582 exim_gid = pw->pw_gid;
1583 #ifndef EXIM_GROUPNAME
1587 "exim: ref:name should specify a usercode, not a group.\n"
1588 "exim: can't let you get away with it unless you also specify a group.\n");
1595 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1601 #ifdef EXIM_GROUPNAME
1602 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1604 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1610 #ifdef CONFIGURE_OWNERNAME
1611 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1613 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1614 CONFIGURE_OWNERNAME);
1619 /* We default the system_filter_user to be the Exim run-time user, as a
1620 sane non-root value. */
1621 system_filter_uid = exim_uid;
1623 #ifdef CONFIGURE_GROUPNAME
1624 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1626 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1627 CONFIGURE_GROUPNAME);
1632 /* In the Cygwin environment, some initialization used to need doing.
1633 It was fudged in by means of this macro; now no longer but we'll leave
1634 it in case of others. */
1640 /* Check a field which is patched when we are running Exim within its
1641 testing harness; do a fast initial check, and then the whole thing. */
1643 running_in_test_harness =
1644 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1646 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1647 at the start of a program; however, it seems that some environments do not
1648 follow this. A "strange" locale can affect the formatting of timestamps, so we
1651 setlocale(LC_ALL, "C");
1653 /* Set up the default handler for timing using alarm(). */
1655 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1657 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1658 because store_malloc writes a log entry on failure. */
1660 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1662 fprintf(stderr, "exim: failed to get store for log buffer\n");
1666 /* Initialize the default log options. */
1668 bits_set(log_selector, log_selector_size, log_default);
1670 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1671 NULL when the daemon is run and the file is closed. We have to use this
1672 indirection, because some systems don't allow writing to the variable "stderr".
1675 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1677 /* Arrange for the PCRE regex library to use our store functions. Note that
1678 the normal calls are actually macros that add additional arguments for
1679 debugging purposes so we have to assign specially constructed functions here.
1680 The default is to use store in the stacking pool, but this is overridden in the
1681 regex_must_compile() function. */
1683 pcre_malloc = function_store_get;
1684 pcre_free = function_dummy_free;
1686 /* Ensure there is a big buffer for temporary use in several places. It is put
1687 in malloc store so that it can be freed for enlargement if necessary. */
1689 big_buffer = store_malloc(big_buffer_size);
1691 /* Set up the handler for the data request signal, and set the initial
1692 descriptive text. */
1694 set_process_info("initializing");
1695 os_restarting_signal(SIGUSR1, usr1_handler);
1697 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1698 in the daemon code. For the rest of Exim's uses, we ignore it. */
1700 signal(SIGHUP, SIG_IGN);
1702 /* We don't want to die on pipe errors as the code is written to handle
1703 the write error instead. */
1705 signal(SIGPIPE, SIG_IGN);
1707 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1708 set to SIG_IGN. This causes subprocesses that complete before the parent
1709 process waits for them not to hang around, so when Exim calls wait(), nothing
1710 is there. The wait() code has been made robust against this, but let's ensure
1711 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1712 ending status. We use sigaction rather than plain signal() on those OS where
1713 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1714 problem on AIX with this.) */
1718 struct sigaction act;
1719 act.sa_handler = SIG_DFL;
1720 sigemptyset(&(act.sa_mask));
1722 sigaction(SIGCHLD, &act, NULL);
1725 signal(SIGCHLD, SIG_DFL);
1728 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1733 /* Set up the version number. Set up the leading 'E' for the external form of
1734 message ids, set the pointer to the internal form, and initialize it to
1735 indicate no message being processed. */
1738 message_id_option[0] = '-';
1739 message_id_external = message_id_option + 1;
1740 message_id_external[0] = 'E';
1741 message_id = message_id_external + 1;
1744 /* Set the umask to zero so that any files Exim creates using open() are
1745 created with the modes that it specifies. NOTE: Files created with fopen() have
1746 a problem, which was not recognized till rather late (February 2006). With this
1747 umask, such files will be world writeable. (They are all content scanning files
1748 in the spool directory, which isn't world-accessible, so this is not a
1749 disaster, but it's untidy.) I don't want to change this overall setting,
1750 however, because it will interact badly with the open() calls. Instead, there's
1751 now a function called modefopen() that fiddles with the umask while calling
1756 /* Precompile the regular expression for matching a message id. Keep this in
1757 step with the code that generates ids in the accept.c module. We need to do
1758 this here, because the -M options check their arguments for syntactic validity
1759 using mac_ismsgid, which uses this. */
1762 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1764 /* Precompile the regular expression that is used for matching an SMTP error
1765 code, possibly extended, at the start of an error message. Note that the
1766 terminating whitespace character is included. */
1769 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1772 #ifdef WHITELIST_D_MACROS
1773 /* Precompile the regular expression used to filter the content of macros
1774 given to -D for permissibility. */
1776 regex_whitelisted_macro =
1777 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1780 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1782 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1783 this seems to be a generally accepted convention, since one finds symbolic
1784 links called "mailq" in standard OS configurations. */
1786 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1787 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1790 receiving_message = FALSE;
1791 called_as = US"-mailq";
1794 /* If the program is called as "rmail" treat it as equivalent to
1795 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1796 i.e. preventing a single dot on a line from terminating the message, and
1797 returning with zero return code, even in cases of error (provided an error
1798 message has been sent). */
1800 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1801 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1804 called_as = US"-rmail";
1805 errors_sender_rc = EXIT_SUCCESS;
1808 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1809 this is a smail convention. */
1811 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1812 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1814 smtp_input = smtp_batched_input = TRUE;
1815 called_as = US"-rsmtp";
1818 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1819 this is a smail convention. */
1821 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1822 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1825 receiving_message = FALSE;
1826 called_as = US"-runq";
1829 /* If the program is called as "newaliases" treat it as equivalent to
1830 "exim -bi"; this is a sendmail convention. */
1832 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1833 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1836 receiving_message = FALSE;
1837 called_as = US"-newaliases";
1840 /* Save the original effective uid for a couple of uses later. It should
1841 normally be root, but in some esoteric environments it may not be. */
1843 original_euid = geteuid();
1845 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1846 to be the same as the real ones. This makes a difference only if Exim is setuid
1847 (or setgid) to something other than root, which could be the case in some
1848 special configurations. */
1850 real_uid = getuid();
1851 real_gid = getgid();
1853 if (real_uid == root_uid)
1855 rv = setgid(real_gid);
1858 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1859 (long int)real_gid, strerror(errno));
1862 rv = setuid(real_uid);
1865 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1866 (long int)real_uid, strerror(errno));
1871 /* If neither the original real uid nor the original euid was root, Exim is
1872 running in an unprivileged state. */
1874 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1876 /* Scan the program's arguments. Some can be dealt with right away; others are
1877 simply recorded for checking and handling afterwards. Do a high-level switch
1878 on the second character (the one after '-'), to save some effort. */
1880 for (i = 1; i < argc; i++)
1882 BOOL badarg = FALSE;
1883 uschar *arg = argv[i];
1887 /* An argument not starting with '-' is the start of a recipients list;
1888 break out of the options-scanning loop. */
1896 /* An option consisting of -- terminates the options */
1898 if (Ustrcmp(arg, "--") == 0)
1900 recipients_arg = i + 1;
1904 /* Handle flagged options */
1906 switchchar = arg[1];
1909 /* Make all -ex options synonymous with -oex arguments, since that
1910 is assumed by various callers. Also make -qR options synonymous with -R
1911 options, as that seems to be required as well. Allow for -qqR too, and
1912 the same for -S options. */
1914 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1915 Ustrncmp(arg+1, "qR", 2) == 0 ||
1916 Ustrncmp(arg+1, "qS", 2) == 0)
1918 switchchar = arg[2];
1921 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1923 switchchar = arg[3];
1925 queue_2stage = TRUE;
1928 /* Make -r synonymous with -f, since it is a documented alias */
1930 else if (arg[1] == 'r') switchchar = 'f';
1932 /* Make -ov synonymous with -v */
1934 else if (Ustrcmp(arg, "-ov") == 0)
1940 /* deal with --option_aliases */
1941 else if (switchchar == '-')
1943 if (Ustrcmp(argrest, "help") == 0)
1945 usage_wanted = TRUE;
1948 else if (Ustrcmp(argrest, "version") == 0)
1955 /* High-level switch on active initial letter */
1960 /* sendmail uses -Ac and -Am to control which .cf file is used;
1963 if (*argrest == '\0') { badarg = TRUE; break; }
1966 BOOL ignore = FALSE;
1971 if (*(argrest + 1) == '\0')
1975 if (!ignore) { badarg = TRUE; break; }
1979 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1980 so has no need of it. */
1983 if (*argrest == 0) i++; /* Skip over the type */
1988 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1990 /* -bd: Run in daemon mode, awaiting SMTP connections.
1991 -bdf: Ditto, but in the foreground.
1994 if (*argrest == 'd')
1996 daemon_listen = TRUE;
1997 if (*(++argrest) == 'f') background_daemon = FALSE;
1998 else if (*argrest != 0) { badarg = TRUE; break; }
2001 /* -be: Run in expansion test mode
2002 -bem: Ditto, but read a message from a file first
2005 else if (*argrest == 'e')
2007 expansion_test = checking = TRUE;
2008 if (argrest[1] == 'm')
2010 if (++i >= argc) { badarg = TRUE; break; }
2011 expansion_test_message = argv[i];
2014 if (argrest[1] != 0) { badarg = TRUE; break; }
2017 /* -bF: Run system filter test */
2019 else if (*argrest == 'F')
2021 filter_test |= checking = FTEST_SYSTEM;
2022 if (*(++argrest) != 0) { badarg = TRUE; break; }
2023 if (++i < argc) filter_test_sfile = argv[i]; else
2025 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2030 /* -bf: Run user filter test
2031 -bfd: Set domain for filter testing
2032 -bfl: Set local part for filter testing
2033 -bfp: Set prefix for filter testing
2034 -bfs: Set suffix for filter testing
2037 else if (*argrest == 'f')
2039 if (*(++argrest) == 0)
2041 filter_test |= checking = FTEST_USER;
2042 if (++i < argc) filter_test_ufile = argv[i]; else
2044 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2052 fprintf(stderr, "exim: string expected after %s\n", arg);
2055 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2056 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2057 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2058 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2059 else { badarg = TRUE; break; }
2063 /* -bh: Host checking - an IP address must follow. */
2065 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2067 if (++i >= argc) { badarg = TRUE; break; }
2068 sender_host_address = argv[i];
2069 host_checking = checking = log_testing_mode = TRUE;
2070 host_checking_callout = argrest[1] == 'c';
2071 message_logs = FALSE;
2074 /* -bi: This option is used by sendmail to initialize *the* alias file,
2075 though it has the -oA option to specify a different file. Exim has no
2076 concept of *the* alias file, but since Sun's YP make script calls
2077 sendmail this way, some support must be provided. */
2079 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2081 /* -bI: provide information, of the type to follow after a colon.
2082 This is an Exim flag. */
2084 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2086 uschar *p = &argrest[2];
2087 info_flag = CMDINFO_HELP;
2090 if (strcmpic(p, CUS"sieve") == 0)
2092 info_flag = CMDINFO_SIEVE;
2095 else if (strcmpic(p, CUS"dscp") == 0)
2097 info_flag = CMDINFO_DSCP;
2100 else if (strcmpic(p, CUS"help") == 0)
2107 /* -bm: Accept and deliver message - the default option. Reinstate
2108 receiving_message, which got turned off for all -b options. */
2110 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2112 /* -bmalware: test the filename given for malware */
2114 else if (Ustrcmp(argrest, "malware") == 0)
2116 if (++i >= argc) { badarg = TRUE; break; }
2118 malware_test_file = argv[i];
2121 /* -bnq: For locally originating messages, do not qualify unqualified
2122 addresses. In the envelope, this causes errors; in header lines they
2125 else if (Ustrcmp(argrest, "nq") == 0)
2127 allow_unqualified_sender = FALSE;
2128 allow_unqualified_recipient = FALSE;
2131 /* -bpxx: List the contents of the mail queue, in various forms. If
2132 the option is -bpc, just a queue count is needed. Otherwise, if the
2133 first letter after p is r, then order is random. */
2135 else if (*argrest == 'p')
2137 if (*(++argrest) == 'c')
2140 if (*(++argrest) != 0) badarg = TRUE;
2144 if (*argrest == 'r')
2146 list_queue_option = 8;
2149 else list_queue_option = 0;
2153 /* -bp: List the contents of the mail queue, top-level only */
2155 if (*argrest == 0) {}
2157 /* -bpu: List the contents of the mail queue, top-level undelivered */
2159 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2161 /* -bpa: List the contents of the mail queue, including all delivered */
2163 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2165 /* Unknown after -bp[r] */
2175 /* -bP: List the configuration variables given as the address list.
2176 Force -v, so configuration errors get displayed. */
2178 else if (Ustrcmp(argrest, "P") == 0)
2180 /* -bP config: we need to setup here, because later,
2181 * when list_options is checked, the config is read already */
2182 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2185 readconf_save_config(version_string);
2189 list_options = TRUE;
2190 debug_selector |= D_v;
2191 debug_file = stderr;
2195 /* -brt: Test retry configuration lookup */
2197 else if (Ustrcmp(argrest, "rt") == 0)
2200 test_retry_arg = i + 1;
2204 /* -brw: Test rewrite configuration */
2206 else if (Ustrcmp(argrest, "rw") == 0)
2209 test_rewrite_arg = i + 1;
2213 /* -bS: Read SMTP commands on standard input, but produce no replies -
2214 all errors are reported by sending messages. */
2216 else if (Ustrcmp(argrest, "S") == 0)
2217 smtp_input = smtp_batched_input = receiving_message = TRUE;
2219 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2220 on standard output. */
2222 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2224 /* -bt: address testing mode */
2226 else if (Ustrcmp(argrest, "t") == 0)
2227 address_test_mode = checking = log_testing_mode = TRUE;
2229 /* -bv: verify addresses */
2231 else if (Ustrcmp(argrest, "v") == 0)
2232 verify_address_mode = checking = log_testing_mode = TRUE;
2234 /* -bvs: verify sender addresses */
2236 else if (Ustrcmp(argrest, "vs") == 0)
2238 verify_address_mode = checking = log_testing_mode = TRUE;
2239 verify_as_sender = TRUE;
2242 /* -bV: Print version string and support details */
2244 else if (Ustrcmp(argrest, "V") == 0)
2246 printf("Exim version %s #%s built %s\n", version_string,
2247 version_cnumber, version_date);
2248 printf("%s\n", CS version_copyright);
2249 version_printed = TRUE;
2250 show_whats_supported(stdout);
2251 log_testing_mode = TRUE;
2254 /* -bw: inetd wait mode, accept a listening socket as stdin */
2256 else if (*argrest == 'w')
2258 inetd_wait_mode = TRUE;
2259 background_daemon = FALSE;
2260 daemon_listen = TRUE;
2261 if (*(++argrest) != '\0')
2263 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2264 if (inetd_wait_timeout <= 0)
2266 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2276 /* -C: change configuration file list; ignore if it isn't really
2277 a change! Enforce a prefix check if required. */
2282 if(++i < argc) argrest = argv[i]; else
2283 { badarg = TRUE; break; }
2285 if (Ustrcmp(config_main_filelist, argrest) != 0)
2287 #ifdef ALT_CONFIG_PREFIX
2289 int len = Ustrlen(ALT_CONFIG_PREFIX);
2290 const uschar *list = argrest;
2292 while((filename = string_nextinlist(&list, &sep, big_buffer,
2293 big_buffer_size)) != NULL)
2295 if ((Ustrlen(filename) < len ||
2296 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2297 Ustrstr(filename, "/../") != NULL) &&
2298 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2300 fprintf(stderr, "-C Permission denied\n");
2305 if (real_uid != root_uid)
2307 #ifdef TRUSTED_CONFIG_LIST
2309 if (real_uid != exim_uid
2310 #ifdef CONFIGURE_OWNER
2311 && real_uid != config_uid
2314 trusted_config = FALSE;
2317 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2320 struct stat statbuf;
2322 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2323 (statbuf.st_uid != root_uid /* owner not root */
2324 #ifdef CONFIGURE_OWNER
2325 && statbuf.st_uid != config_uid /* owner not the special one */
2328 (statbuf.st_gid != root_gid /* group not root */
2329 #ifdef CONFIGURE_GROUP
2330 && statbuf.st_gid != config_gid /* group not the special one */
2332 && (statbuf.st_mode & 020) != 0 /* group writeable */
2334 (statbuf.st_mode & 2) != 0) /* world writeable */
2336 trusted_config = FALSE;
2341 /* Well, the trust list at least is up to scratch... */
2342 void *reset_point = store_get(0);
2343 uschar *trusted_configs[32];
2347 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2349 uschar *start = big_buffer, *nl;
2350 while (*start && isspace(*start))
2354 nl = Ustrchr(start, '\n');
2357 trusted_configs[nr_configs++] = string_copy(start);
2358 if (nr_configs == 32)
2366 const uschar *list = argrest;
2368 while (trusted_config && (filename = string_nextinlist(&list,
2369 &sep, big_buffer, big_buffer_size)) != NULL)
2371 for (i=0; i < nr_configs; i++)
2373 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2376 if (i == nr_configs)
2378 trusted_config = FALSE;
2382 store_reset(reset_point);
2386 /* No valid prefixes found in trust_list file. */
2387 trusted_config = FALSE;
2393 /* Could not open trust_list file. */
2394 trusted_config = FALSE;
2398 /* Not root; don't trust config */
2399 trusted_config = FALSE;
2403 config_main_filelist = argrest;
2404 config_changed = TRUE;
2409 /* -D: set up a macro definition */
2412 #ifdef DISABLE_D_OPTION
2413 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2420 uschar *s = argrest;
2423 while (isspace(*s)) s++;
2425 if (*s < 'A' || *s > 'Z')
2427 fprintf(stderr, "exim: macro name set by -D must start with "
2428 "an upper case letter\n");
2432 while (isalnum(*s) || *s == '_')
2434 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2438 if (ptr == 0) { badarg = TRUE; break; }
2439 while (isspace(*s)) s++;
2442 if (*s++ != '=') { badarg = TRUE; break; }
2443 while (isspace(*s)) s++;
2446 for (m = macros; m; m = m->next)
2447 if (Ustrcmp(m->name, name) == 0)
2449 fprintf(stderr, "exim: duplicated -D in command line\n");
2453 m = macro_create(string_copy(name), string_copy(s), TRUE);
2455 if (clmacro_count >= MAX_CLMACROS)
2457 fprintf(stderr, "exim: too many -D options on command line\n");
2460 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2466 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2467 The latter is now a no-op, retained for compatibility only. If -dd is used,
2468 debugging subprocesses of the daemon is disabled. */
2471 if (Ustrcmp(argrest, "ropcr") == 0)
2473 /* drop_cr = TRUE; */
2476 /* Use an intermediate variable so that we don't set debugging while
2477 decoding the debugging bits. */
2481 unsigned int selector = D_default;
2484 if (*argrest == 'd')
2486 debug_daemon = TRUE;
2490 decode_bits(&selector, 1, debug_notall, argrest,
2491 debug_options, debug_options_count, US"debug", 0);
2492 debug_selector = selector;
2497 /* -E: This is a local error message. This option is not intended for
2498 external use at all, but is not restricted to trusted callers because it
2499 does no harm (just suppresses certain error messages) and if Exim is run
2500 not setuid root it won't always be trusted when it generates error
2501 messages using this option. If there is a message id following -E, point
2502 message_reference at it, for logging. */
2505 local_error_message = TRUE;
2506 if (mac_ismsgid(argrest)) message_reference = argrest;
2510 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2511 option, so it looks as if historically the -oex options are also callable
2512 without the leading -o. So we have to accept them. Before the switch,
2513 anything starting -oe has been converted to -e. Exim does not support all
2514 of the sendmail error options. */
2517 if (Ustrcmp(argrest, "e") == 0)
2519 arg_error_handling = ERRORS_SENDER;
2520 errors_sender_rc = EXIT_SUCCESS;
2522 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2523 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2524 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2525 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2530 /* -F: Set sender's full name, used instead of the gecos entry from
2531 the password file. Since users can usually alter their gecos entries,
2532 there's no security involved in using this instead. The data can follow
2533 the -F or be in the next argument. */
2538 if(++i < argc) argrest = argv[i]; else
2539 { badarg = TRUE; break; }
2541 originator_name = argrest;
2542 sender_name_forced = TRUE;
2546 /* -f: Set sender's address - this value is only actually used if Exim is
2547 run by a trusted user, or if untrusted_set_sender is set and matches the
2548 address, except that the null address can always be set by any user. The
2549 test for this happens later, when the value given here is ignored when not
2550 permitted. For an untrusted user, the actual sender is still put in Sender:
2551 if it doesn't match the From: header (unless no_local_from_check is set).
2552 The data can follow the -f or be in the next argument. The -r switch is an
2553 obsolete form of -f but since there appear to be programs out there that
2554 use anything that sendmail has ever supported, better accept it - the
2555 synonymizing is done before the switch above.
2557 At this stage, we must allow domain literal addresses, because we don't
2558 know what the setting of allow_domain_literals is yet. Ditto for trailing
2559 dots and strip_trailing_dot. */
2563 int dummy_start, dummy_end;
2567 if (i+1 < argc) argrest = argv[++i]; else
2568 { badarg = TRUE; break; }
2571 sender_address = string_sprintf(""); /* Ensure writeable memory */
2574 uschar *temp = argrest + Ustrlen(argrest) - 1;
2575 while (temp >= argrest && isspace(*temp)) temp--;
2576 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2577 allow_domain_literals = TRUE;
2578 strip_trailing_dot = TRUE;
2580 allow_utf8_domains = TRUE;
2582 sender_address = parse_extract_address(argrest, &errmess,
2583 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2585 message_smtputf8 = string_is_utf8(sender_address);
2586 allow_utf8_domains = FALSE;
2588 allow_domain_literals = FALSE;
2589 strip_trailing_dot = FALSE;
2590 if (sender_address == NULL)
2592 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2593 return EXIT_FAILURE;
2596 sender_address_forced = TRUE;
2600 /* -G: sendmail invocation to specify that it's a gateway submission and
2601 sendmail may complain about problems instead of fixing them.
2602 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2603 not at this time complain about problems. */
2609 /* -h: Set the hop count for an incoming message. Exim does not currently
2610 support this; it always computes it by counting the Received: headers.
2611 To put it in will require a change to the spool header file format. */
2616 if(++i < argc) argrest = argv[i]; else
2617 { badarg = TRUE; break; }
2619 if (!isdigit(*argrest)) badarg = TRUE;
2623 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2624 not to be documented for sendmail but mailx (at least) uses it) */
2627 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2631 /* -L: set the identifier used for syslog; equivalent to setting
2632 syslog_processname in the config file, but needs to be an admin option. */
2635 if (*argrest == '\0')
2637 if(++i < argc) argrest = argv[i]; else
2638 { badarg = TRUE; break; }
2640 sz = Ustrlen(argrest);
2643 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2644 return EXIT_FAILURE;
2648 fprintf(stderr, "exim: the -L syslog name is too short\n");
2649 return EXIT_FAILURE;
2651 cmdline_syslog_name = argrest;
2655 receiving_message = FALSE;
2657 /* -MC: continue delivery of another message via an existing open
2658 file descriptor. This option is used for an internal call by the
2659 smtp transport when there is a pending message waiting to go to an
2660 address to which it has got a connection. Five subsequent arguments are
2661 required: transport name, host name, IP address, sequence number, and
2662 message_id. Transports may decline to create new processes if the sequence
2663 number gets too big. The channel is stdin. This (-MC) must be the last
2664 argument. There's a subsequent check that the real-uid is privileged.
2666 If we are running in the test harness. delay for a bit, to let the process
2667 that set this one up complete. This makes for repeatability of the logging,
2670 if (Ustrcmp(argrest, "C") == 0)
2672 union sockaddr_46 interface_sock;
2673 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2677 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2678 return EXIT_FAILURE;
2681 if (msg_action_arg >= 0)
2683 fprintf(stderr, "exim: incompatible arguments\n");
2684 return EXIT_FAILURE;
2687 continue_transport = argv[++i];
2688 continue_hostname = argv[++i];
2689 continue_host_address = argv[++i];
2690 continue_sequence = Uatoi(argv[++i]);
2691 msg_action = MSG_DELIVER;
2692 msg_action_arg = ++i;
2693 forced_delivery = TRUE;
2694 queue_run_pid = passed_qr_pid;
2695 queue_run_pipe = passed_qr_pipe;
2697 if (!mac_ismsgid(argv[i]))
2699 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2701 return EXIT_FAILURE;
2704 /* Set up $sending_ip_address and $sending_port, unless proxied */
2706 if (!continue_proxy_cipher)
2707 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2709 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2713 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2715 return EXIT_FAILURE;
2718 if (running_in_test_harness) millisleep(500);
2722 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2726 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2727 precedes -MC (see above). The flag indicates that the host to which
2728 Exim is connected has accepted an AUTH sequence. */
2730 case 'A': smtp_authenticated = TRUE; break;
2732 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2733 that exim is connected to supports the esmtp extension DSN */
2735 case 'D': smtp_peer_options |= OPTION_DSN; break;
2737 /* -MCG: set the queue name, to a non-default value */
2739 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2743 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2745 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2747 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2748 it preceded -MC (see above) */
2750 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2752 /* -MCQ: pass on the pid of the queue-running process that started
2753 this chain of deliveries and the fd of its synchronizing pipe; this
2754 is useful only when it precedes -MC (see above) */
2756 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2758 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2762 /* -MCS: set the smtp_use_size flag; this is useful only when it
2763 precedes -MC (see above) */
2765 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2768 /* -MCt: similar to -MCT below but the connection is still open
2769 via a proxy proces which handles the TLS context and coding.
2770 Require three arguments for the proxied local address and port,
2771 and the TLS cipher. */
2773 case 't': if (++i < argc) sending_ip_address = argv[i];
2775 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2777 if (++i < argc) continue_proxy_cipher = argv[i];
2781 /* -MCT: set the tls_offered flag; this is useful only when it
2782 precedes -MC (see above). The flag indicates that the host to which
2783 Exim is connected has offered TLS support. */
2785 case 'T': smtp_peer_options |= OPTION_TLS; break;
2788 default: badarg = TRUE; break;
2793 /* -M[x]: various operations on the following list of message ids:
2794 -M deliver the messages, ignoring next retry times and thawing
2795 -Mc deliver the messages, checking next retry times, no thawing
2796 -Mf freeze the messages
2797 -Mg give up on the messages
2798 -Mt thaw the messages
2799 -Mrm remove the messages
2800 In the above cases, this must be the last option. There are also the
2801 following options which are followed by a single message id, and which
2802 act on that message. Some of them use the "recipient" addresses as well.
2803 -Mar add recipient(s)
2804 -Mmad mark all recipients delivered
2805 -Mmd mark recipients(s) delivered
2807 -Mset load a message for use with -be
2809 -Mvc show copy (of whole message, in RFC 2822 format)
2814 else if (*argrest == 0)
2816 msg_action = MSG_DELIVER;
2817 forced_delivery = deliver_force_thaw = TRUE;
2819 else if (Ustrcmp(argrest, "ar") == 0)
2821 msg_action = MSG_ADD_RECIPIENT;
2822 one_msg_action = TRUE;
2824 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2825 else if (Ustrcmp(argrest, "es") == 0)
2827 msg_action = MSG_EDIT_SENDER;
2828 one_msg_action = TRUE;
2830 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2831 else if (Ustrcmp(argrest, "g") == 0)
2833 msg_action = MSG_DELIVER;
2834 deliver_give_up = TRUE;
2836 else if (Ustrcmp(argrest, "mad") == 0)
2838 msg_action = MSG_MARK_ALL_DELIVERED;
2840 else if (Ustrcmp(argrest, "md") == 0)
2842 msg_action = MSG_MARK_DELIVERED;
2843 one_msg_action = TRUE;
2845 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2846 else if (Ustrcmp(argrest, "set") == 0)
2848 msg_action = MSG_LOAD;
2849 one_msg_action = TRUE;
2851 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2852 else if (Ustrcmp(argrest, "vb") == 0)
2854 msg_action = MSG_SHOW_BODY;
2855 one_msg_action = TRUE;
2857 else if (Ustrcmp(argrest, "vc") == 0)
2859 msg_action = MSG_SHOW_COPY;
2860 one_msg_action = TRUE;
2862 else if (Ustrcmp(argrest, "vh") == 0)
2864 msg_action = MSG_SHOW_HEADER;
2865 one_msg_action = TRUE;
2867 else if (Ustrcmp(argrest, "vl") == 0)
2869 msg_action = MSG_SHOW_LOG;
2870 one_msg_action = TRUE;
2872 else { badarg = TRUE; break; }
2874 /* All the -Mxx options require at least one message id. */
2876 msg_action_arg = i + 1;
2877 if (msg_action_arg >= argc)
2879 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2880 return EXIT_FAILURE;
2883 /* Some require only message ids to follow */
2885 if (!one_msg_action)
2888 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2890 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2892 return EXIT_FAILURE;
2894 goto END_ARG; /* Remaining args are ids */
2897 /* Others require only one message id, possibly followed by addresses,
2898 which will be handled as normal arguments. */
2902 if (!mac_ismsgid(argv[msg_action_arg]))
2904 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2905 argv[msg_action_arg], arg);
2906 return EXIT_FAILURE;
2913 /* Some programs seem to call the -om option without the leading o;
2914 for sendmail it askes for "me too". Exim always does this. */
2917 if (*argrest != 0) badarg = TRUE;
2921 /* -N: don't do delivery - a debugging option that stops transports doing
2922 their thing. It implies debugging at the D_v level. */
2927 dont_deliver = TRUE;
2928 debug_selector |= D_v;
2929 debug_file = stderr;
2935 /* -n: This means "don't alias" in sendmail, apparently.
2936 For normal invocations, it has no effect.
2937 It may affect some other options. */
2943 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2944 option to the specified value. This form uses long names. We need to handle
2945 -O option=value and -Ooption=value. */
2952 fprintf(stderr, "exim: string expected after -O\n");
2960 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2963 if (*argrest == 'A')
2965 alias_arg = argrest + 1;
2966 if (alias_arg[0] == 0)
2968 if (i+1 < argc) alias_arg = argv[++i]; else
2970 fprintf(stderr, "exim: string expected after -oA\n");
2976 /* -oB: Set a connection message max value for remote deliveries */
2978 else if (*argrest == 'B')
2980 uschar *p = argrest + 1;
2983 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2985 connection_max_messages = 1;
2994 fprintf(stderr, "exim: number expected after -oB\n");
2997 connection_max_messages = Uatoi(p);
3001 /* -odb: background delivery */
3003 else if (Ustrcmp(argrest, "db") == 0)
3005 synchronous_delivery = FALSE;
3006 arg_queue_only = FALSE;
3007 queue_only_set = TRUE;
3010 /* -odf: foreground delivery (smail-compatible option); same effect as
3011 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3014 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3016 synchronous_delivery = TRUE;
3017 arg_queue_only = FALSE;
3018 queue_only_set = TRUE;
3021 /* -odq: queue only */
3023 else if (Ustrcmp(argrest, "dq") == 0)
3025 synchronous_delivery = FALSE;
3026 arg_queue_only = TRUE;
3027 queue_only_set = TRUE;
3030 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3031 but no remote delivery */
3033 else if (Ustrcmp(argrest, "dqs") == 0)
3036 arg_queue_only = FALSE;
3037 queue_only_set = TRUE;
3040 /* -oex: Sendmail error flags. As these are also accepted without the
3041 leading -o prefix, for compatibility with vacation and other callers,
3042 they are handled with -e above. */
3044 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3045 -oitrue: Another sendmail syntax for the same */
3047 else if (Ustrcmp(argrest, "i") == 0 ||
3048 Ustrcmp(argrest, "itrue") == 0)
3051 /* -oM*: Set various characteristics for an incoming message; actually
3052 acted on for trusted callers only. */
3054 else if (*argrest == 'M')
3058 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3062 /* -oMa: Set sender host address */
3064 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3066 /* -oMaa: Set authenticator name */
3068 else if (Ustrcmp(argrest, "Maa") == 0)
3069 sender_host_authenticated = argv[++i];
3071 /* -oMas: setting authenticated sender */
3073 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3075 /* -oMai: setting authenticated id */
3077 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3079 /* -oMi: Set incoming interface address */
3081 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3083 /* -oMm: Message reference */
3085 else if (Ustrcmp(argrest, "Mm") == 0)
3087 if (!mac_ismsgid(argv[i+1]))
3089 fprintf(stderr,"-oMm must be a valid message ID\n");
3092 if (!trusted_config)
3094 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3097 message_reference = argv[++i];
3100 /* -oMr: Received protocol */
3102 else if (Ustrcmp(argrest, "Mr") == 0)
3104 if (received_protocol)
3106 fprintf(stderr, "received_protocol is set already\n");
3109 else received_protocol = argv[++i];
3111 /* -oMs: Set sender host name */
3113 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3115 /* -oMt: Set sender ident */
3117 else if (Ustrcmp(argrest, "Mt") == 0)
3119 sender_ident_set = TRUE;
3120 sender_ident = argv[++i];
3123 /* Else a bad argument */
3132 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3133 seem to call this as -m (undocumented), so that is also accepted (see
3136 else if (Ustrcmp(argrest, "m") == 0) {}
3138 /* -oo: An ancient flag for old-style addresses which still seems to
3139 crop up in some calls (see in SCO). */
3141 else if (Ustrcmp(argrest, "o") == 0) {}
3143 /* -oP <name>: set pid file path for daemon */
3145 else if (Ustrcmp(argrest, "P") == 0)
3146 override_pid_file_path = argv[++i];
3148 /* -or <n>: set timeout for non-SMTP acceptance
3149 -os <n>: set timeout for SMTP acceptance */
3151 else if (*argrest == 'r' || *argrest == 's')
3153 int *tp = (*argrest == 'r')?
3154 &arg_receive_timeout : &arg_smtp_receive_timeout;
3155 if (argrest[1] == 0)
3157 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3159 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3162 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3167 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3169 else if (Ustrcmp(argrest, "X") == 0)
3170 override_local_interfaces = argv[++i];
3172 /* Unknown -o argument */
3178 /* -ps: force Perl startup; -pd force delayed Perl startup */
3182 if (*argrest == 's' && argrest[1] == 0)
3184 perl_start_option = 1;
3187 if (*argrest == 'd' && argrest[1] == 0)
3189 perl_start_option = -1;
3194 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3195 which sets the host protocol and host name */
3199 if (i+1 < argc) argrest = argv[++i]; else
3200 { badarg = TRUE; break; }
3207 if (received_protocol)
3209 fprintf(stderr, "received_protocol is set already\n");
3213 hn = Ustrchr(argrest, ':');
3216 received_protocol = argrest;
3220 int old_pool = store_pool;
3221 store_pool = POOL_PERM;
3222 received_protocol = string_copyn(argrest, hn - argrest);
3223 store_pool = old_pool;
3224 sender_host_name = hn + 1;
3231 receiving_message = FALSE;
3232 if (queue_interval >= 0)
3234 fprintf(stderr, "exim: -q specified more than once\n");
3238 /* -qq...: Do queue runs in a 2-stage manner */
3240 if (*argrest == 'q')
3242 queue_2stage = TRUE;
3246 /* -qi...: Do only first (initial) deliveries */
3248 if (*argrest == 'i')
3250 queue_run_first_delivery = TRUE;
3254 /* -qf...: Run the queue, forcing deliveries
3255 -qff..: Ditto, forcing thawing as well */
3257 if (*argrest == 'f')
3259 queue_run_force = TRUE;
3260 if (*++argrest == 'f')
3262 deliver_force_thaw = TRUE;
3267 /* -q[f][f]l...: Run the queue only on local deliveries */
3269 if (*argrest == 'l')
3271 queue_run_local = TRUE;
3275 /* -q[f][f][l][G<name>]... Work on the named queue */
3277 if (*argrest == 'G')
3280 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3281 queue_name = string_copyn(argrest, i);
3283 if (*argrest == '/') argrest++;
3286 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3287 only, optionally named, optionally starting from a given message id. */
3289 if (*argrest == 0 &&
3290 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3293 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3294 start_queue_run_id = argv[++i];
3295 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3296 stop_queue_run_id = argv[++i];
3299 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3300 forced, optionally local only, optionally named. */
3302 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3305 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3311 case 'R': /* Synonymous with -qR... */
3312 receiving_message = FALSE;
3314 /* -Rf: As -R (below) but force all deliveries,
3315 -Rff: Ditto, but also thaw all frozen messages,
3316 -Rr: String is regex
3317 -Rrf: Regex and force
3318 -Rrff: Regex and force and thaw
3320 in all cases provided there are no further characters in this
3326 for (i = 0; i < nelem(rsopts); i++)
3327 if (Ustrcmp(argrest, rsopts[i]) == 0)
3329 if (i != 2) queue_run_force = TRUE;
3330 if (i >= 2) deliver_selectstring_regex = TRUE;
3331 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3332 argrest += Ustrlen(rsopts[i]);
3336 /* -R: Set string to match in addresses for forced queue run to
3337 pick out particular messages. */
3340 deliver_selectstring = argrest;
3341 else if (i+1 < argc)
3342 deliver_selectstring = argv[++i];
3345 fprintf(stderr, "exim: string expected after -R\n");
3351 /* -r: an obsolete synonym for -f (see above) */
3354 /* -S: Like -R but works on sender. */
3356 case 'S': /* Synonymous with -qS... */
3357 receiving_message = FALSE;
3359 /* -Sf: As -S (below) but force all deliveries,
3360 -Sff: Ditto, but also thaw all frozen messages,
3361 -Sr: String is regex
3362 -Srf: Regex and force
3363 -Srff: Regex and force and thaw
3365 in all cases provided there are no further characters in this
3371 for (i = 0; i < nelem(rsopts); i++)
3372 if (Ustrcmp(argrest, rsopts[i]) == 0)
3374 if (i != 2) queue_run_force = TRUE;
3375 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3376 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3377 argrest += Ustrlen(rsopts[i]);
3381 /* -S: Set string to match in addresses for forced queue run to
3382 pick out particular messages. */
3385 deliver_selectstring_sender = argrest;
3386 else if (i+1 < argc)
3387 deliver_selectstring_sender = argv[++i];
3390 fprintf(stderr, "exim: string expected after -S\n");
3395 /* -Tqt is an option that is exclusively for use by the testing suite.
3396 It is not recognized in other circumstances. It allows for the setting up
3397 of explicit "queue times" so that various warning/retry things can be
3398 tested. Otherwise variability of clock ticks etc. cause problems. */
3401 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3402 fudged_queue_times = argv[++i];
3407 /* -t: Set flag to extract recipients from body of message. */
3410 if (*argrest == 0) extract_recipients = TRUE;
3412 /* -ti: Set flag to extract recipients from body of message, and also
3413 specify that dot does not end the message. */
3415 else if (Ustrcmp(argrest, "i") == 0)
3417 extract_recipients = TRUE;
3421 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3424 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3431 /* -U: This means "initial user submission" in sendmail, apparently. The
3432 doc claims that in future sendmail may refuse syntactically invalid
3433 messages instead of fixing them. For the moment, we just ignore it. */
3439 /* -v: verify things - this is a very low-level debugging */
3444 debug_selector |= D_v;
3445 debug_file = stderr;
3451 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3453 The -x flag tells the sendmail command that mail from a local
3454 mail program has National Language Support (NLS) extended characters
3455 in the body of the mail item. The sendmail command can send mail with
3456 extended NLS characters across networks that normally corrupts these
3459 As Exim is 8-bit clean, it just ignores this flag. */
3462 if (*argrest != 0) badarg = TRUE;
3465 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3466 logs to that file. We swallow the parameter and otherwise ignore it. */
3469 if (*argrest == '\0')
3472 fprintf(stderr, "exim: string expected after -X\n");
3478 if (*argrest == '\0')
3479 if (++i < argc) log_oneline = argv[i]; else
3481 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3486 /* All other initial characters are errors */
3491 } /* End of high-level switch statement */
3493 /* Failed to recognize the option, or syntax error */
3497 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3498 "option %s\n", arg);
3504 /* If -R or -S have been specified without -q, assume a single queue run. */
3506 if ( (deliver_selectstring || deliver_selectstring_sender)
3507 && queue_interval < 0)
3512 /* If usage_wanted is set we call the usage function - which never returns */
3513 if (usage_wanted) exim_usage(called_as);
3515 /* Arguments have been processed. Check for incompatibilities. */
3517 (smtp_input || extract_recipients || recipients_arg < argc) &&
3518 (daemon_listen || queue_interval >= 0 || bi_option ||
3519 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3520 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3523 msg_action_arg > 0 &&
3524 (daemon_listen || queue_interval > 0 || list_options ||
3525 (checking && msg_action != MSG_LOAD) ||
3526 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3529 (daemon_listen || queue_interval > 0) &&
3530 (sender_address != NULL || list_options || list_queue || checking ||
3534 daemon_listen && queue_interval == 0
3537 inetd_wait_mode && queue_interval >= 0
3541 (checking || smtp_input || extract_recipients ||
3542 filter_test != FTEST_NONE || bi_option)
3545 verify_address_mode &&
3546 (address_test_mode || smtp_input || extract_recipients ||
3547 filter_test != FTEST_NONE || bi_option)
3550 address_test_mode && (smtp_input || extract_recipients ||
3551 filter_test != FTEST_NONE || bi_option)
3554 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3558 deliver_selectstring != NULL && queue_interval < 0
3561 msg_action == MSG_LOAD &&
3562 (!expansion_test || expansion_test_message != NULL)
3566 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3570 /* If debugging is set up, set the file and the file descriptor to pass on to
3571 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3572 to run in the foreground. */
3574 if (debug_selector != 0)
3576 debug_file = stderr;
3577 debug_fd = fileno(debug_file);
3578 background_daemon = FALSE;
3579 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3580 if (debug_selector != D_v) /* -v only doesn't show this */
3582 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3583 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3585 if (!version_printed)
3586 show_whats_supported(stderr);
3590 /* When started with root privilege, ensure that the limits on the number of
3591 open files and the number of processes (where that is accessible) are
3592 sufficiently large, or are unset, in case Exim has been called from an
3593 environment where the limits are screwed down. Not all OS have the ability to
3594 change some of these limits. */
3598 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3604 #ifdef RLIMIT_NOFILE
3605 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3607 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3609 rlp.rlim_cur = rlp.rlim_max = 0;
3612 /* I originally chose 1000 as a nice big number that was unlikely to
3613 be exceeded. It turns out that some older OS have a fixed upper limit of
3616 if (rlp.rlim_cur < 1000)
3618 rlp.rlim_cur = rlp.rlim_max = 1000;
3619 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3621 rlp.rlim_cur = rlp.rlim_max = 256;
3622 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3623 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3630 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3632 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3634 rlp.rlim_cur = rlp.rlim_max = 0;
3637 #ifdef RLIM_INFINITY
3638 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3640 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3642 if (rlp.rlim_cur < 1000)
3644 rlp.rlim_cur = rlp.rlim_max = 1000;
3646 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3647 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3653 /* Exim is normally entered as root (but some special configurations are
3654 possible that don't do this). However, it always spins off sub-processes that
3655 set their uid and gid as required for local delivery. We don't want to pass on
3656 any extra groups that root may belong to, so we want to get rid of them all at
3659 We need to obey setgroups() at this stage, before possibly giving up root
3660 privilege for a changed configuration file, but later on we might need to
3661 check on the additional groups for the admin user privilege - can't do that
3662 till after reading the config, which might specify the exim gid. Therefore,
3663 save the group list here first. */
3665 group_count = getgroups(NGROUPS_MAX, group_list);
3666 if (group_count < 0)
3668 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3672 /* There is a fundamental difference in some BSD systems in the matter of
3673 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3674 known not to be different. On the "different" systems there is a single group
3675 list, and the first entry in it is the current group. On all other versions of
3676 Unix there is a supplementary group list, which is in *addition* to the current
3677 group. Consequently, to get rid of all extraneous groups on a "standard" system
3678 you pass over 0 groups to setgroups(), while on a "different" system you pass
3679 over a single group - the current group, which is always the first group in the
3680 list. Calling setgroups() with zero groups on a "different" system results in
3681 an error return. The following code should cope with both types of system.
3683 However, if this process isn't running as root, setgroups() can't be used
3684 since you have to be root to run it, even if throwing away groups. Not being
3685 root here happens only in some unusual configurations. We just ignore the
3688 if (setgroups(0, NULL) != 0)
3690 if (setgroups(1, group_list) != 0 && !unprivileged)
3692 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3697 /* If the configuration file name has been altered by an argument on the
3698 command line (either a new file name or a macro definition) and the caller is
3699 not root, or if this is a filter testing run, remove any setuid privilege the
3700 program has and run as the underlying user.
3702 The exim user is locked out of this, which severely restricts the use of -C
3705 Otherwise, set the real ids to the effective values (should be root unless run
3706 from inetd, which it can either be root or the exim uid, if one is configured).
3708 There is a private mechanism for bypassing some of this, in order to make it
3709 possible to test lots of configurations automatically, without having either to
3710 recompile each time, or to patch in an actual configuration file name and other
3711 values (such as the path name). If running in the test harness, pretend that
3712 configuration file changes and macro definitions haven't happened. */
3715 (!trusted_config || /* Config changed, or */
3716 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3717 real_uid != root_uid && /* Not root, and */
3718 !running_in_test_harness /* Not fudged */
3720 expansion_test /* expansion testing */
3722 filter_test != FTEST_NONE) /* Filter testing */
3724 setgroups(group_count, group_list);
3725 exim_setugid(real_uid, real_gid, FALSE,
3726 US"-C, -D, -be or -bf forces real uid");
3727 removed_privilege = TRUE;
3729 /* In the normal case when Exim is called like this, stderr is available
3730 and should be used for any logging information because attempts to write
3731 to the log will usually fail. To arrange this, we unset really_exim. However,
3732 if no stderr is available there is no point - we might as well have a go
3733 at the log (if it fails, syslog will be written).
3735 Note that if the invoker is Exim, the logs remain available. Messing with
3736 this causes unlogged successful deliveries. */
3738 if ((log_stderr != NULL) && (real_uid != exim_uid))
3739 really_exim = FALSE;
3742 /* Privilege is to be retained for the moment. It may be dropped later,
3743 depending on the job that this Exim process has been asked to do. For now, set
3744 the real uid to the effective so that subsequent re-execs of Exim are done by a
3747 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3749 /* If testing a filter, open the file(s) now, before wasting time doing other
3750 setups and reading the message. */
3752 if ((filter_test & FTEST_SYSTEM) != 0)
3754 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3757 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3759 return EXIT_FAILURE;
3763 if ((filter_test & FTEST_USER) != 0)
3765 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3768 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3770 return EXIT_FAILURE;
3774 /* Initialise lookup_list
3775 If debugging, already called above via version reporting.
3776 In either case, we initialise the list of available lookups while running
3777 as root. All dynamically modules are loaded from a directory which is
3778 hard-coded into the binary and is code which, if not a module, would be
3779 part of Exim already. Ability to modify the content of the directory
3780 is equivalent to the ability to modify a setuid binary!
3782 This needs to happen before we read the main configuration. */
3786 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3789 /* Read the main runtime configuration data; this gives up if there
3790 is a failure. It leaves the configuration file open so that the subsequent
3791 configuration data for delivery can be read if needed.
3793 NOTE: immediatly after opening the configuration file we change the working
3794 directory to "/"! Later we change to $spool_directory. We do it there, because
3795 during readconf_main() some expansion takes place already. */
3797 /* Store the initial cwd before we change directories */
3798 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3800 perror("exim: can't get the current working directory");
3805 -be[m] expansion test -
3806 -b[fF] filter test new
3808 -bmalware malware_test_file new
3810 -brw rewrite test new
3812 -bv[s] address verify -
3814 -bP <option> (except -bP config, which sets list_config)
3816 If any of these options is set, we suppress warnings about configuration
3817 issues (currently about tls_advertise_hosts and keep_environment not being
3820 readconf_main(checking || list_options);
3822 if (builtin_macros_create_trigger) DEBUG(D_any)
3823 debug_printf("Builtin macros created (expensive) due to config line '%.*s'\n",
3824 Ustrlen(builtin_macros_create_trigger)-1, builtin_macros_create_trigger);
3826 /* Now in directory "/" */
3828 if (cleanup_environment() == FALSE)
3829 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3832 /* If an action on specific messages is requested, or if a daemon or queue
3833 runner is being started, we need to know if Exim was called by an admin user.
3834 This is the case if the real user is root or exim, or if the real group is
3835 exim, or if one of the supplementary groups is exim or a group listed in
3836 admin_groups. We don't fail all message actions immediately if not admin_user,
3837 since some actions can be performed by non-admin users. Instead, set admin_user
3838 for later interrogation. */
3840 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3845 for (i = 0; i < group_count && !admin_user; i++)
3846 if (group_list[i] == exim_gid)
3848 else if (admin_groups)
3849 for (j = 1; j <= (int)admin_groups[0] && !admin_user; j++)
3850 if (admin_groups[j] == group_list[i])
3854 /* Another group of privileged users are the trusted users. These are root,
3855 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3856 are permitted to specify sender_addresses with -f on the command line, and
3857 other message parameters as well. */
3859 if (real_uid == root_uid || real_uid == exim_uid)
3860 trusted_caller = TRUE;
3866 for (i = 1; i <= (int)trusted_users[0] && !trusted_caller; i++)
3867 if (trusted_users[i] == real_uid)
3868 trusted_caller = TRUE;
3871 for (i = 1; i <= (int)trusted_groups[0] && !trusted_caller; i++)
3872 if (trusted_groups[i] == real_gid)
3873 trusted_caller = TRUE;
3874 else for (j = 0; j < group_count && !trusted_caller; j++)
3875 if (trusted_groups[i] == group_list[j])
3876 trusted_caller = TRUE;
3879 /* At this point, we know if the user is privileged and some command-line
3880 options become possibly imperssible, depending upon the configuration file. */
3882 if (checking && commandline_checks_require_admin && !admin_user) {
3883 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3887 /* Handle the decoding of logging options. */
3889 decode_bits(log_selector, log_selector_size, log_notall,
3890 log_selector_string, log_options, log_options_count, US"log", 0);
3895 debug_printf("configuration file is %s\n", config_main_filename);
3896 debug_printf("log selectors =");
3897 for (i = 0; i < log_selector_size; i++)
3898 debug_printf(" %08x", log_selector[i]);
3902 /* If domain literals are not allowed, check the sender address that was
3903 supplied with -f. Ditto for a stripped trailing dot. */
3905 if (sender_address != NULL)
3907 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3909 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3910 "allowed\n", sender_address);
3911 return EXIT_FAILURE;
3913 if (f_end_dot && !strip_trailing_dot)
3915 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3916 "(trailing dot not allowed)\n", sender_address);
3917 return EXIT_FAILURE;
3921 /* See if an admin user overrode our logging. */
3923 if (cmdline_syslog_name != NULL)
3927 syslog_processname = cmdline_syslog_name;
3928 log_file_path = string_copy(CUS"syslog");
3932 /* not a panic, non-privileged users should not be able to spam paniclog */
3934 "exim: you lack sufficient privilege to specify syslog process name\n");
3935 return EXIT_FAILURE;
3939 /* Paranoia check of maximum lengths of certain strings. There is a check
3940 on the length of the log file path in log.c, which will come into effect
3941 if there are any calls to write the log earlier than this. However, if we
3942 get this far but the string is very long, it is better to stop now than to
3943 carry on and (e.g.) receive a message and then have to collapse. The call to
3944 log_write() from here will cause the ultimate panic collapse if the complete
3945 file name exceeds the buffer length. */
3947 if (Ustrlen(log_file_path) > 200)
3948 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3949 "log_file_path is longer than 200 chars: aborting");
3951 if (Ustrlen(pid_file_path) > 200)
3952 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3953 "pid_file_path is longer than 200 chars: aborting");
3955 if (Ustrlen(spool_directory) > 200)
3956 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3957 "spool_directory is longer than 200 chars: aborting");
3959 /* Length check on the process name given to syslog for its TAG field,
3960 which is only permitted to be 32 characters or less. See RFC 3164. */
3962 if (Ustrlen(syslog_processname) > 32)
3963 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3964 "syslog_processname is longer than 32 chars: aborting");
3969 log_write(0, LOG_MAIN, "%s", log_oneline);
3970 return EXIT_SUCCESS;
3973 return EXIT_FAILURE;
3975 /* In some operating systems, the environment variable TMPDIR controls where
3976 temporary files are created; Exim doesn't use these (apart from when delivering
3977 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3978 If TMPDIR is found in the environment, reset it to the value defined in the
3979 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3980 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3981 EXIM_TMPDIR by the build scripts.
3987 if (environ) for (p = USS environ; *p; p++)
3988 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3990 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3991 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3993 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3998 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3999 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4000 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4001 called by a user who has set the TZ variable. This then affects the timestamps
4002 in log files and in Received: headers, and any created Date: header lines. The
4003 required timezone is settable in the configuration file, so nothing can be done
4004 about this earlier - but hopefully nothing will normally be logged earlier than
4005 this. We have to make a new environment if TZ is wrong, but don't bother if
4006 timestamps_utc is set, because then all times are in UTC anyway. */
4008 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4009 timestamps_utc = TRUE;
4012 uschar *envtz = US getenv("TZ");
4014 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4015 : timezone_string != NULL
4018 uschar **p = USS environ;
4022 if (environ) while (*p++) count++;
4023 if (!envtz) count++;
4024 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4025 if (environ) for (p = USS environ; *p; p++)
4026 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4027 if (timezone_string)
4029 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4030 sprintf(CS *newp++, "TZ=%s", timezone_string);
4035 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4036 tod_stamp(tod_log));
4040 /* Handle the case when we have removed the setuid privilege because of -C or
4041 -D. This means that the caller of Exim was not root.
4043 There is a problem if we were running as the Exim user. The sysadmin may
4044 expect this case to retain privilege because "the binary was called by the
4045 Exim user", but it hasn't, because either the -D option set macros, or the
4046 -C option set a non-trusted configuration file. There are two possibilities:
4048 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4049 to do message deliveries. Thus, the fact that it is running as a
4050 non-privileged user is plausible, and might be wanted in some special
4051 configurations. However, really_exim will have been set false when
4052 privilege was dropped, to stop Exim trying to write to its normal log
4053 files. Therefore, re-enable normal log processing, assuming the sysadmin
4054 has set up the log directory correctly.
4056 (2) If deliver_drop_privilege is not set, the configuration won't work as
4057 apparently intended, and so we log a panic message. In order to retain
4058 root for -C or -D, the caller must either be root or be invoking a
4059 trusted configuration file (when deliver_drop_privilege is false). */
4061 if ( removed_privilege
4062 && (!trusted_config || opt_D_used)
4063 && real_uid == exim_uid)
4064 if (deliver_drop_privilege)
4065 really_exim = TRUE; /* let logging work normally */
4067 log_write(0, LOG_MAIN|LOG_PANIC,
4068 "exim user lost privilege for using %s option",
4069 trusted_config? "-D" : "-C");
4071 /* Start up Perl interpreter if Perl support is configured and there is a
4072 perl_startup option, and the configuration or the command line specifies
4073 initializing starting. Note that the global variables are actually called
4074 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4077 if (perl_start_option != 0)
4078 opt_perl_at_start = (perl_start_option > 0);
4079 if (opt_perl_at_start && opt_perl_startup != NULL)
4082 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4083 errstr = init_perl(opt_perl_startup);
4086 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4087 return EXIT_FAILURE;
4089 opt_perl_started = TRUE;
4091 #endif /* EXIM_PERL */
4093 /* Log the arguments of the call if the configuration file said so. This is
4094 a debugging feature for finding out what arguments certain MUAs actually use.
4095 Don't attempt it if logging is disabled, or if listing variables or if
4096 verifying/testing addresses or expansions. */
4098 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4099 && really_exim && !list_options && !checking)
4102 uschar *p = big_buffer;
4103 Ustrcpy(p, "cwd= (failed)");
4105 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4108 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4110 for (i = 0; i < argc; i++)
4112 int len = Ustrlen(argv[i]);
4113 const uschar *printing;
4115 if (p + len + 8 >= big_buffer + big_buffer_size)
4118 log_write(0, LOG_MAIN, "%s", big_buffer);
4119 Ustrcpy(big_buffer, "...");
4122 printing = string_printing(argv[i]);
4123 if (printing[0] == 0) quote = US"\""; else
4125 const uschar *pp = printing;
4127 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4129 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4130 (p - big_buffer) - 4), printing, quote);
4133 if (LOGGING(arguments))
4134 log_write(0, LOG_MAIN, "%s", big_buffer);
4136 debug_printf("%s\n", big_buffer);
4139 /* Set the working directory to be the top-level spool directory. We don't rely
4140 on this in the code, which always uses fully qualified names, but it's useful
4141 for core dumps etc. Don't complain if it fails - the spool directory might not
4142 be generally accessible and calls with the -C option (and others) have lost
4143 privilege by now. Before the chdir, we try to ensure that the directory exists.
4146 if (Uchdir(spool_directory) != 0)
4149 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4150 dummy = /* quieten compiler */ Uchdir(spool_directory);
4151 dummy = dummy; /* yet more compiler quietening, sigh */
4154 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4155 alias file. Exim doesn't have such a concept, but this call is screwed into
4156 Sun's YP makefiles. Handle this by calling a configured script, as the real
4157 user who called Exim. The -oA option can be used to pass an argument to the
4162 (void)fclose(config_file);
4163 if (bi_command != NULL)
4167 argv[i++] = bi_command;
4168 if (alias_arg != NULL) argv[i++] = alias_arg;
4171 setgroups(group_count, group_list);
4172 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4174 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4175 (argv[1] == NULL)? US"" : argv[1]);
4177 execv(CS argv[0], (char *const *)argv);
4178 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4183 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4188 /* We moved the admin/trusted check to be immediately after reading the
4189 configuration file. We leave these prints here to ensure that syslog setup,
4190 logfile setup, and so on has already happened. */
4192 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4193 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4195 /* Only an admin user may start the daemon or force a queue run in the default
4196 configuration, but the queue run restriction can be relaxed. Only an admin
4197 user may request that a message be returned to its sender forthwith. Only an
4198 admin user may specify a debug level greater than D_v (because it might show
4199 passwords, etc. in lookup queries). Only an admin user may request a queue
4200 count. Only an admin user can use the test interface to scan for email
4201 (because Exim will be in the spool dir and able to look at mails). */
4205 BOOL debugset = (debug_selector & ~D_v) != 0;
4206 if (deliver_give_up || daemon_listen || malware_test_file ||
4207 (count_queue && queue_list_requires_admin) ||
4208 (list_queue && queue_list_requires_admin) ||
4209 (queue_interval >= 0 && prod_requires_admin) ||
4210 (debugset && !running_in_test_harness))
4212 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4217 /* If the real user is not root or the exim uid, the argument for passing
4218 in an open TCP/IP connection for another message is not permitted, nor is
4219 running with the -N option for any delivery action, unless this call to exim is
4220 one that supplied an input message, or we are using a patched exim for
4221 regression testing. */
4223 if (real_uid != root_uid && real_uid != exim_uid &&
4224 (continue_hostname != NULL ||
4226 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4227 )) && !running_in_test_harness)
4229 fprintf(stderr, "exim: Permission denied\n");
4230 return EXIT_FAILURE;
4233 /* If the caller is not trusted, certain arguments are ignored when running for
4234 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4235 Note that authority for performing certain actions on messages is tested in the
4236 queue_action() function. */
4238 if (!trusted_caller && !checking)
4240 sender_host_name = sender_host_address = interface_address =
4241 sender_ident = received_protocol = NULL;
4242 sender_host_port = interface_port = 0;
4243 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4246 /* If a sender host address is set, extract the optional port number off the
4247 end of it and check its syntax. Do the same thing for the interface address.
4248 Exim exits if the syntax is bad. */
4252 if (sender_host_address != NULL)
4253 sender_host_port = check_port(sender_host_address);
4254 if (interface_address != NULL)
4255 interface_port = check_port(interface_address);
4258 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4263 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4264 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4268 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4269 return EXIT_FAILURE;
4273 /* If an SMTP message is being received check to see if the standard input is a
4274 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4275 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4280 union sockaddr_46 inetd_sock;
4281 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4282 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4284 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4285 if (family == AF_INET || family == AF_INET6)
4287 union sockaddr_46 interface_sock;
4288 size = sizeof(interface_sock);
4290 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4291 interface_address = host_ntoa(-1, &interface_sock, NULL,
4294 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4296 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4299 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4300 NULL, &sender_host_port);
4301 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4302 "inetd is not supported when mua_wrapper is set");
4307 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4308 return EXIT_FAILURE;
4314 /* If the load average is going to be needed while receiving a message, get it
4315 now for those OS that require the first call to os_getloadavg() to be done as
4316 root. There will be further calls later for each message received. */
4318 #ifdef LOAD_AVG_NEEDS_ROOT
4319 if (receiving_message &&
4320 (queue_only_load >= 0 ||
4321 (is_inetd && smtp_load_reserve >= 0)
4324 load_average = OS_GETLOADAVG();
4328 /* The queue_only configuration option can be overridden by -odx on the command
4329 line, except that if queue_only_override is false, queue_only cannot be unset
4330 from the command line. */
4332 if (queue_only_set && (queue_only_override || arg_queue_only))
4333 queue_only = arg_queue_only;
4335 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4338 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4339 if (arg_smtp_receive_timeout >= 0)
4340 smtp_receive_timeout = arg_smtp_receive_timeout;
4342 /* If Exim was started with root privilege, unless we have already removed the
4343 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4344 except when starting the daemon or doing some kind of delivery or address
4345 testing (-bt). These are the only cases when root need to be retained. We run
4346 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4347 retained only for starting the daemon. We always do the initgroups() in this
4348 situation (controlled by the TRUE below), in order to be as close as possible
4349 to the state Exim usually runs in. */
4351 if (!unprivileged && /* originally had root AND */
4352 !removed_privilege && /* still got root AND */
4353 !daemon_listen && /* not starting the daemon */
4354 queue_interval <= 0 && /* (either kind of daemon) */
4356 deliver_drop_privilege || /* requested unprivileged */
4358 queue_interval < 0 && /* not running the queue */
4359 (msg_action_arg < 0 || /* and */
4360 msg_action != MSG_DELIVER) && /* not delivering and */
4361 (!checking || !address_test_mode) /* not address checking */
4363 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4365 /* When we are retaining a privileged uid, we still change to the exim gid. */
4370 rv = setgid(exim_gid);
4371 /* Impact of failure is that some stuff might end up with an incorrect group.
4372 We track this for failures from root, since any attempt to change privilege
4373 by root should succeed and failures should be examined. For non-root,
4374 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4375 no need to complain then. */
4377 if (!(unprivileged || removed_privilege))
4380 "exim: changing group failed: %s\n", strerror(errno));
4384 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4385 (long int)exim_gid, strerror(errno));
4388 /* Handle a request to scan a file for malware */
4389 if (malware_test_file)
4391 #ifdef WITH_CONTENT_SCAN
4393 set_process_info("scanning file for malware");
4394 result = malware_in_file(malware_test_file);
4397 printf("No malware found.\n");
4402 printf("Malware lookup returned non-okay/fail: %d\n", result);
4406 printf("Malware found: %s\n", malware_name);
4408 printf("Malware scan detected malware of unknown name.\n");
4410 printf("Malware scanning not enabled at compile time.\n");
4415 /* Handle a request to list the delivery queue */
4419 set_process_info("listing the queue");
4420 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4424 /* Handle a request to count the delivery queue */
4428 set_process_info("counting the queue");
4433 /* Handle actions on specific messages, except for the force delivery and
4434 message load actions, which are done below. Some actions take a whole list of
4435 message ids, which are known to continue up to the end of the arguments. Others
4436 take a single message id and then operate on the recipients list. */
4438 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4440 int yield = EXIT_SUCCESS;
4441 set_process_info("acting on specified messages");
4443 if (!one_msg_action)
4445 for (i = msg_action_arg; i < argc; i++)
4446 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4447 yield = EXIT_FAILURE;
4450 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4451 recipients_arg)) yield = EXIT_FAILURE;
4455 /* We used to set up here to skip reading the ACL section, on
4456 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4457 Now, since the intro of the ${acl } expansion, ACL definitions may be
4458 needed in transports so we lost the optimisation. */
4462 /* The configuration data will have been read into POOL_PERM because we won't
4463 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4464 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4465 configuration were read into POOL_MAIN, because we don't do any resets till
4466 later on. However, it seems right, and it does ensure that both pools get used.
4469 store_pool = POOL_MAIN;
4471 /* Handle the -brt option. This is for checking out retry configurations.
4472 The next three arguments are a domain name or a complete address, and
4473 optionally two error numbers. All it does is to call the function that
4474 scans the retry configuration data. */
4476 if (test_retry_arg >= 0)
4478 retry_config *yield;
4479 int basic_errno = 0;
4483 if (test_retry_arg >= argc)
4485 printf("-brt needs a domain or address argument\n");
4486 exim_exit(EXIT_FAILURE);
4488 s1 = argv[test_retry_arg++];
4491 /* If the first argument contains no @ and no . it might be a local user
4492 or it might be a single-component name. Treat as a domain. */
4494 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4496 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4497 "being \ntreated as a one-component domain, not as a local part.\n\n",
4501 /* There may be an optional second domain arg. */
4503 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4504 s2 = argv[test_retry_arg++];
4506 /* The final arg is an error name */
4508 if (test_retry_arg < argc)
4510 uschar *ss = argv[test_retry_arg];
4512 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4515 printf("%s\n", CS error);
4516 return EXIT_FAILURE;
4519 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4520 code > 100 as an error is for matching codes to the decade. Turn them into
4521 a real error code, off the decade. */
4523 if (basic_errno == ERRNO_MAIL4XX ||
4524 basic_errno == ERRNO_RCPT4XX ||
4525 basic_errno == ERRNO_DATA4XX)
4527 int code = (more_errno >> 8) & 255;
4529 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4530 else if (code > 100)
4531 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4535 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4536 printf("No retry information found\n");
4540 more_errno = yield->more_errno;
4541 printf("Retry rule: %s ", yield->pattern);
4543 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4545 printf("quota%s%s ",
4546 (more_errno > 0)? "_" : "",
4547 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4549 else if (yield->basic_errno == ECONNREFUSED)
4551 printf("refused%s%s ",
4552 (more_errno > 0)? "_" : "",
4553 (more_errno == 'M')? "MX" :
4554 (more_errno == 'A')? "A" : "");
4556 else if (yield->basic_errno == ETIMEDOUT)
4559 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4561 if (more_errno != 0) printf("_%s",
4562 (more_errno == 'M')? "MX" : "A");
4565 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4566 printf("auth_failed ");
4569 for (r = yield->rules; r; r = r->next)
4571 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4572 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4578 printf(",%d.", x/1000);
4592 exim_exit(EXIT_SUCCESS);
4595 /* Handle a request to list one or more configuration options */
4596 /* If -n was set, we suppress some information */
4600 set_process_info("listing variables");
4601 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4602 else for (i = recipients_arg; i < argc; i++)
4605 (Ustrcmp(argv[i], "router") == 0 ||
4606 Ustrcmp(argv[i], "transport") == 0 ||
4607 Ustrcmp(argv[i], "authenticator") == 0 ||
4608 Ustrcmp(argv[i], "macro") == 0 ||
4609 Ustrcmp(argv[i], "environment") == 0))
4611 readconf_print(argv[i+1], argv[i], flag_n);
4614 else readconf_print(argv[i], NULL, flag_n);
4616 exim_exit(EXIT_SUCCESS);
4621 set_process_info("listing config");
4622 readconf_print(US"config", NULL, flag_n);
4623 exim_exit(EXIT_SUCCESS);
4627 /* Initialise subsystems as required */
4628 #ifndef DISABLE_DKIM
4634 /* Handle a request to deliver one or more messages that are already on the
4635 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4636 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4638 Delivery of specific messages is typically used for a small number when
4639 prodding by hand (when the option forced_delivery will be set) or when
4640 re-execing to regain root privilege. Each message delivery must happen in a
4641 separate process, so we fork a process for each one, and run them sequentially
4642 so that debugging output doesn't get intertwined, and to avoid spawning too
4643 many processes if a long list is given. However, don't fork for the last one;
4644 this saves a process in the common case when Exim is called to deliver just one
4647 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4649 if (prod_requires_admin && !admin_user)
4651 fprintf(stderr, "exim: Permission denied\n");
4652 exim_exit(EXIT_FAILURE);
4654 set_process_info("delivering specified messages");
4655 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4656 for (i = msg_action_arg; i < argc; i++)
4661 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4662 else if ((pid = fork()) == 0)
4664 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4665 _exit(EXIT_SUCCESS);
4669 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4671 exim_exit(EXIT_FAILURE);
4675 exim_exit(EXIT_SUCCESS);
4679 /* If only a single queue run is requested, without SMTP listening, we can just
4680 turn into a queue runner, with an optional starting message id. */
4682 if (queue_interval == 0 && !daemon_listen)
4684 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4685 (start_queue_run_id == NULL)? US"" : US" starting at ",
4686 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4687 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4688 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4690 set_process_info("running the '%s' queue (single queue run)", queue_name);
4692 set_process_info("running the queue (single queue run)");
4693 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4694 exim_exit(EXIT_SUCCESS);
4698 /* Find the login name of the real user running this process. This is always
4699 needed when receiving a message, because it is written into the spool file. It
4700 may also be used to construct a from: or a sender: header, and in this case we
4701 need the user's full name as well, so save a copy of it, checked for RFC822
4702 syntax and munged if necessary, if it hasn't previously been set by the -F
4703 argument. We may try to get the passwd entry more than once, in case NIS or
4704 other delays are in evidence. Save the home directory for use in filter testing
4709 if ((pw = getpwuid(real_uid)) != NULL)
4711 originator_login = string_copy(US pw->pw_name);
4712 originator_home = string_copy(US pw->pw_dir);
4714 /* If user name has not been set by -F, set it from the passwd entry
4715 unless -f has been used to set the sender address by a trusted user. */
4717 if (!originator_name)
4719 if (!sender_address || (!trusted_caller && filter_test == FTEST_NONE))
4721 uschar *name = US pw->pw_gecos;
4722 uschar *amp = Ustrchr(name, '&');
4725 /* Most Unix specify that a '&' character in the gecos field is
4726 replaced by a copy of the login name, and some even specify that
4727 the first character should be upper cased, so that's what we do. */
4732 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4733 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4734 buffer[loffset] = toupper(buffer[loffset]);
4738 /* If a pattern for matching the gecos field was supplied, apply
4739 it and then expand the name string. */
4741 if (gecos_pattern && gecos_name)
4744 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4746 if (regex_match_and_setup(re, name, 0, -1))
4748 uschar *new_name = expand_string(gecos_name);
4752 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4753 "gecos field \"%s\"\n", new_name, name);
4756 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4757 "\"%s\": %s\n", gecos_name, expand_string_message);
4759 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4760 "gecos field \"%s\"\n", gecos_pattern, name);
4761 store_free((void *)re);
4763 originator_name = string_copy(name);
4766 /* A trusted caller has used -f but not -F */
4768 else originator_name = US"";
4771 /* Break the retry loop */
4776 if (++i > finduser_retries) break;
4780 /* If we cannot get a user login, log the incident and give up, unless the
4781 configuration specifies something to use. When running in the test harness,
4782 any setting of unknown_login overrides the actual name. */
4784 if (originator_login == NULL || running_in_test_harness)
4786 if (unknown_login != NULL)
4788 originator_login = expand_string(unknown_login);
4789 if (originator_name == NULL && unknown_username != NULL)
4790 originator_name = expand_string(unknown_username);
4791 if (originator_name == NULL) originator_name = US"";
4793 if (originator_login == NULL)
4794 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4798 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4801 originator_name = string_copy(parse_fix_phrase(originator_name,
4802 Ustrlen(originator_name), big_buffer, big_buffer_size));
4804 /* If a message is created by this call of Exim, the uid/gid of its originator
4805 are those of the caller. These values are overridden if an existing message is
4806 read in from the spool. */
4808 originator_uid = real_uid;
4809 originator_gid = real_gid;
4811 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4812 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4814 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4815 returns. We leave this till here so that the originator_ fields are available
4816 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4819 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4823 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4824 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4825 "mua_wrapper is set");
4830 /* If the sender ident has not been set (by a trusted caller) set it to
4831 the caller. This will get overwritten below for an inetd call. If a trusted
4832 caller has set it empty, unset it. */
4834 if (sender_ident == NULL) sender_ident = originator_login;
4835 else if (sender_ident[0] == 0) sender_ident = NULL;
4837 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4838 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4839 originator_* variables set. */
4841 if (test_rewrite_arg >= 0)
4843 really_exim = FALSE;
4844 if (test_rewrite_arg >= argc)
4846 printf("-brw needs an address argument\n");
4847 exim_exit(EXIT_FAILURE);
4849 rewrite_test(argv[test_rewrite_arg]);
4850 exim_exit(EXIT_SUCCESS);
4853 /* A locally-supplied message is considered to be coming from a local user
4854 unless a trusted caller supplies a sender address with -f, or is passing in the
4855 message via SMTP (inetd invocation or otherwise). */
4857 if ((sender_address == NULL && !smtp_input) ||
4858 (!trusted_caller && filter_test == FTEST_NONE))
4860 sender_local = TRUE;
4862 /* A trusted caller can supply authenticated_sender and authenticated_id
4863 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4864 defaults except when host checking. */
4866 if (authenticated_sender == NULL && !host_checking)
4867 authenticated_sender = string_sprintf("%s@%s", originator_login,
4868 qualify_domain_sender);
4869 if (authenticated_id == NULL && !host_checking)
4870 authenticated_id = originator_login;
4873 /* Trusted callers are always permitted to specify the sender address.
4874 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4875 is specified is the empty address. However, if a trusted caller does not
4876 specify a sender address for SMTP input, we leave sender_address unset. This
4877 causes the MAIL commands to be honoured. */
4879 if ((!smtp_input && sender_address == NULL) ||
4880 !receive_check_set_sender(sender_address))
4882 /* Either the caller is not permitted to set a general sender, or this is
4883 non-SMTP input and the trusted caller has not set a sender. If there is no
4884 sender, or if a sender other than <> is set, override with the originator's
4885 login (which will get qualified below), except when checking things. */
4887 if (sender_address == NULL /* No sender_address set */
4889 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4890 !checking)) /* Not running tests, including filter tests */
4892 sender_address = originator_login;
4893 sender_address_forced = FALSE;
4894 sender_address_domain = 0;
4898 /* Remember whether an untrusted caller set the sender address */
4900 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4902 /* Ensure that the sender address is fully qualified unless it is the empty
4903 address, which indicates an error message, or doesn't exist (root caller, smtp
4904 interface, no -f argument). */
4906 if (sender_address != NULL && sender_address[0] != 0 &&
4907 sender_address_domain == 0)
4908 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4909 qualify_domain_sender);
4911 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4913 /* Handle a request to verify a list of addresses, or test them for delivery.
4914 This must follow the setting of the sender address, since routers can be
4915 predicated upon the sender. If no arguments are given, read addresses from
4916 stdin. Set debug_level to at least D_v to get full output for address testing.
4919 if (verify_address_mode || address_test_mode)
4922 int flags = vopt_qualify;
4924 if (verify_address_mode)
4926 if (!verify_as_sender) flags |= vopt_is_recipient;
4927 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4932 flags |= vopt_is_recipient;
4933 debug_selector |= D_v;
4934 debug_file = stderr;
4935 debug_fd = fileno(debug_file);
4936 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4939 if (recipients_arg < argc)
4941 while (recipients_arg < argc)
4943 uschar *s = argv[recipients_arg++];
4946 BOOL finished = FALSE;
4947 uschar *ss = parse_find_address_end(s, FALSE);
4948 if (*ss == ',') *ss = 0; else finished = TRUE;
4949 test_address(s, flags, &exit_value);
4952 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4959 uschar *s = get_stdinput(NULL, NULL);
4960 if (s == NULL) break;
4961 test_address(s, flags, &exit_value);
4965 exim_exit(exit_value);
4968 /* Handle expansion checking. Either expand items on the command line, or read
4969 from stdin if there aren't any. If -Mset was specified, load the message so
4970 that its variables can be used, but restrict this facility to admin users.
4971 Otherwise, if -bem was used, read a message from stdin. */
4975 dns_init(FALSE, FALSE, FALSE);
4976 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4978 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4981 fprintf(stderr, "exim: permission denied\n");
4984 message_id = argv[msg_action_arg];
4985 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4986 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4987 printf ("Failed to load message datafile %s\n", message_id);
4988 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4989 printf ("Failed to load message %s\n", message_id);
4992 /* Read a test message from a file. We fudge it up to be on stdin, saving
4993 stdin itself for later reading of expansion strings. */
4995 else if (expansion_test_message != NULL)
4997 int save_stdin = dup(0);
4998 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5001 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5003 return EXIT_FAILURE;
5006 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5007 message_ended = END_NOTENDED;
5008 read_message_body(receive_msg(extract_recipients));
5009 message_linecount += body_linecount;
5010 (void)dup2(save_stdin, 0);
5011 (void)close(save_stdin);
5012 clearerr(stdin); /* Required by Darwin */
5015 /* Allow $recipients for this testing */
5017 enable_dollar_recipients = TRUE;
5019 /* Expand command line items */
5021 if (recipients_arg < argc)
5023 while (recipients_arg < argc)
5025 uschar *s = argv[recipients_arg++];
5026 uschar *ss = expand_string(s);
5027 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5028 else printf("%s\n", CS ss);
5036 char *(*fn_readline)(const char *) = NULL;
5037 void (*fn_addhist)(const char *) = NULL;
5040 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5046 uschar *source = get_stdinput(fn_readline, fn_addhist);
5047 if (source == NULL) break;
5048 ss = expand_string(source);
5050 printf ("Failed: %s\n", expand_string_message);
5051 else printf("%s\n", CS ss);
5055 if (dlhandle != NULL) dlclose(dlhandle);
5059 /* The data file will be open after -Mset */
5061 if (deliver_datafile >= 0)
5063 (void)close(deliver_datafile);
5064 deliver_datafile = -1;
5067 exim_exit(EXIT_SUCCESS);
5071 /* The active host name is normally the primary host name, but it can be varied
5072 for hosts that want to play several parts at once. We need to ensure that it is
5073 set for host checking, and for receiving messages. */
5075 smtp_active_hostname = primary_hostname;
5076 if (raw_active_hostname != NULL)
5078 uschar *nah = expand_string(raw_active_hostname);
5081 if (!expand_string_forcedfail)
5082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5083 "(smtp_active_hostname): %s", raw_active_hostname,
5084 expand_string_message);
5086 else if (nah[0] != 0) smtp_active_hostname = nah;
5089 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5090 given IP address so that the blocking and relay configuration can be tested.
5091 Unless a sender_ident was set by -oMt, we discard it (the default is the
5092 caller's login name). An RFC 1413 call is made only if we are running in the
5093 test harness and an incoming interface and both ports are specified, because
5094 there is no TCP/IP call to find the ident for. */
5101 if (!sender_ident_set)
5103 sender_ident = NULL;
5104 if (running_in_test_harness && sender_host_port != 0 &&
5105 interface_address != NULL && interface_port != 0)
5106 verify_get_ident(1413);
5109 /* In case the given address is a non-canonical IPv6 address, canonicalize
5110 it. The code works for both IPv4 and IPv6, as it happens. */
5112 size = host_aton(sender_host_address, x);
5113 sender_host_address = store_get(48); /* large enough for full IPv6 */
5114 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5116 /* Now set up for testing */
5118 host_build_sender_fullhost();
5122 sender_local = FALSE;
5123 sender_host_notsocket = TRUE;
5124 debug_file = stderr;
5125 debug_fd = fileno(debug_file);
5126 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5127 "**** but without any ident (RFC 1413) callback.\n"
5128 "**** This is not for real!\n\n",
5129 sender_host_address);
5131 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5132 if (verify_check_host(&hosts_connection_nolog) == OK)
5133 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5134 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5136 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5137 because a log line has already been written for all its failure exists
5138 (usually "connection refused: <reason>") and writing another one is
5139 unnecessary clutter. */
5141 if (smtp_start_session())
5143 for (reset_point = store_get(0); ; store_reset(reset_point))
5145 if (smtp_setup_msg() <= 0) break;
5146 if (!receive_msg(FALSE)) break;
5148 return_path = sender_address = NULL;
5149 dnslist_domain = dnslist_matched = NULL;
5150 #ifndef DISABLE_DKIM
5151 dkim_cur_signer = NULL;
5154 deliver_localpart_orig = NULL;
5155 deliver_domain_orig = NULL;
5156 callout_address = sending_ip_address = NULL;
5157 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5161 exim_exit(EXIT_SUCCESS);
5165 /* Arrange for message reception if recipients or SMTP were specified;
5166 otherwise complain unless a version print (-bV) happened or this is a filter
5167 verification test or info dump.
5168 In the former case, show the configuration file name. */
5170 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5172 if (version_printed)
5174 printf("Configuration file is %s\n", config_main_filename);
5175 return EXIT_SUCCESS;
5178 if (info_flag != CMDINFO_NONE)
5180 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5181 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5184 if (filter_test == FTEST_NONE)
5185 exim_usage(called_as);
5189 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5190 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5191 that we are not called from inetd, because that is rejected above. The
5192 following configuration settings are forced here:
5194 (1) Synchronous delivery (-odi)
5195 (2) Errors to stderr (-oep == -oeq)
5196 (3) No parallel remote delivery
5197 (4) Unprivileged delivery
5199 We don't force overall queueing options because there are several of them;
5200 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5201 to override any SMTP queueing. */
5205 synchronous_delivery = TRUE;
5206 arg_error_handling = ERRORS_STDERR;
5207 remote_max_parallel = 1;
5208 deliver_drop_privilege = TRUE;
5210 queue_smtp_domains = NULL;
5212 message_utf8_downconvert = -1; /* convert-if-needed */
5217 /* Prepare to accept one or more new messages on the standard input. When a
5218 message has been read, its id is returned in message_id[]. If doing immediate
5219 delivery, we fork a delivery process for each received message, except for the
5220 last one, where we can save a process switch.
5222 It is only in non-smtp mode that error_handling is allowed to be changed from
5223 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5224 sendmail error modes other than -oem ever actually used? Later: yes.) */
5226 if (!smtp_input) error_handling = arg_error_handling;
5228 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5229 logging being sent down the socket and make an identd call to get the
5234 (void)fclose(stderr);
5235 exim_nullstd(); /* Re-open to /dev/null */
5236 verify_get_ident(IDENT_PORT);
5237 host_build_sender_fullhost();
5238 set_process_info("handling incoming connection from %s via inetd",
5242 /* If the sender host address has been set, build sender_fullhost if it hasn't
5243 already been done (which it will have been for inetd). This caters for the
5244 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5245 so that the test for IP options is skipped for -bs input. */
5247 if (sender_host_address != NULL && sender_fullhost == NULL)
5249 host_build_sender_fullhost();
5250 set_process_info("handling incoming connection from %s via -oMa",
5252 sender_host_notsocket = TRUE;
5255 /* Otherwise, set the sender host as unknown except for inetd calls. This
5256 prevents host checking in the case of -bs not from inetd and also for -bS. */
5258 else if (!is_inetd) sender_host_unknown = TRUE;
5260 /* If stdout does not exist, then dup stdin to stdout. This can happen
5261 if exim is started from inetd. In this case fd 0 will be set to the socket,
5262 but fd 1 will not be set. This also happens for passed SMTP channels. */
5264 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5266 /* Set up the incoming protocol name and the state of the program. Root is
5267 allowed to force received protocol via the -oMr option above. If we have come
5268 via inetd, the process info has already been set up. We don't set
5269 received_protocol here for smtp input, as it varies according to
5270 batch/HELO/EHLO/AUTH/TLS. */
5274 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5275 smtp_batched_input? "batched " : "",
5276 (sender_address!= NULL)? sender_address : originator_login);
5280 int old_pool = store_pool;
5281 store_pool = POOL_PERM;
5282 if (!received_protocol)
5283 received_protocol = string_sprintf("local%s", called_as);
5284 store_pool = old_pool;
5285 set_process_info("accepting a local non-SMTP message from <%s>",
5289 /* Initialize the session_local_queue-only flag (this will be ignored if
5290 mua_wrapper is set) */
5293 session_local_queue_only = queue_only;
5295 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5296 the spool if so configured. On failure, we must not attempt to send an error
5297 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5298 error code is given.) */
5300 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5302 fprintf(stderr, "exim: insufficient disk space\n");
5303 return EXIT_FAILURE;
5306 /* If this is smtp input of any kind, real or batched, handle the start of the
5309 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5310 because a log line has already been written for all its failure exists
5311 (usually "connection refused: <reason>") and writing another one is
5312 unnecessary clutter. */
5318 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5319 if (verify_check_host(&hosts_connection_nolog) == OK)
5320 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5321 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5322 if (!smtp_start_session())
5325 exim_exit(EXIT_SUCCESS);
5329 /* Otherwise, set up the input size limit here. */
5333 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5334 if (expand_string_message)
5335 if (thismessage_size_limit == -1)
5336 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5337 "message_size_limit: %s", expand_string_message);
5339 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5340 "message_size_limit: %s", expand_string_message);
5343 /* Loop for several messages when reading SMTP input. If we fork any child
5344 processes, we don't want to wait for them unless synchronous delivery is
5345 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5346 same as SIG_DFL, despite the fact that documentation often lists the default as
5347 "ignore". This is a confusing area. This is what I know:
5349 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5350 processes that complete simply to go away without ever becoming defunct. You
5351 can't then wait for them - but we don't want to wait for them in the
5352 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5353 happen for all OS (e.g. *BSD is different).
5355 But that's not the end of the story. Some (many? all?) systems have the
5356 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5357 has by default, so it seems that the difference is merely one of default
5358 (compare restarting vs non-restarting signals).
5360 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5361 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5362 of the loop below. Paranoia rules.
5364 February 2003: That's *still* not the end of the story. There are now versions
5365 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5366 process then calls waitpid(), a grumble is written to the system log, because
5367 this is logically inconsistent. In other words, it doesn't like the paranoia.
5368 As a consequence of this, the waitpid() below is now excluded if we are sure
5369 that SIG_IGN works. */
5371 if (!synchronous_delivery)
5374 struct sigaction act;
5375 act.sa_handler = SIG_IGN;
5376 sigemptyset(&(act.sa_mask));
5377 act.sa_flags = SA_NOCLDWAIT;
5378 sigaction(SIGCHLD, &act, NULL);
5380 signal(SIGCHLD, SIG_IGN);
5384 /* Save the current store pool point, for resetting at the start of
5385 each message, and save the real sender address, if any. */
5387 reset_point = store_get(0);
5388 real_sender_address = sender_address;
5390 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5391 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5398 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5399 input and build the recipients list, before calling receive_msg() to read the
5400 message proper. Whatever sender address is given in the SMTP transaction is
5401 often ignored for local senders - we use the actual sender, which is normally
5402 either the underlying user running this process or a -f argument provided by
5403 a trusted caller. It is saved in real_sender_address. The test for whether to
5404 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5409 if ((rc = smtp_setup_msg()) > 0)
5411 if (real_sender_address != NULL &&
5412 !receive_check_set_sender(sender_address))
5414 sender_address = raw_sender = real_sender_address;
5415 sender_address_unrewritten = NULL;
5418 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5419 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5420 the very end. The result of the ACL is ignored (as for other non-SMTP
5421 messages). It is run for its potential side effects. */
5423 if (smtp_batched_input && acl_not_smtp_start != NULL)
5425 uschar *user_msg, *log_msg;
5426 enable_dollar_recipients = TRUE;
5427 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5428 &user_msg, &log_msg);
5429 enable_dollar_recipients = FALSE;
5432 /* Now get the data for the message */
5434 more = receive_msg(extract_recipients);
5435 if (message_id[0] == 0)
5437 cancel_cutthrough_connection(TRUE, US"receive dropped");
5438 if (more) goto moreloop;
5439 smtp_log_no_mail(); /* Log no mail if configured */
5440 exim_exit(EXIT_FAILURE);
5445 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5446 smtp_log_no_mail(); /* Log no mail if configured */
5447 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5451 /* In the non-SMTP case, we have all the information from the command
5452 line, but must process it in case it is in the more general RFC822
5453 format, and in any case, to detect syntax errors. Also, it appears that
5454 the use of comma-separated lists as single arguments is common, so we
5455 had better support them. */
5461 int count = argc - recipients_arg;
5462 uschar **list = argv + recipients_arg;
5464 /* These options cannot be changed dynamically for non-SMTP messages */
5466 active_local_sender_retain = local_sender_retain;
5467 active_local_from_check = local_from_check;
5469 /* Save before any rewriting */
5471 raw_sender = string_copy(sender_address);
5473 /* Loop for each argument */
5475 for (i = 0; i < count; i++)
5477 int start, end, domain;
5479 uschar *s = list[i];
5481 /* Loop for each comma-separated address */
5485 BOOL finished = FALSE;
5487 uschar *ss = parse_find_address_end(s, FALSE);
5489 if (*ss == ',') *ss = 0; else finished = TRUE;
5491 /* Check max recipients - if -t was used, these aren't recipients */
5493 if (recipients_max > 0 && ++rcount > recipients_max &&
5494 !extract_recipients)
5495 if (error_handling == ERRORS_STDERR)
5497 fprintf(stderr, "exim: too many recipients\n");
5498 exim_exit(EXIT_FAILURE);
5503 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5504 errors_sender_rc : EXIT_FAILURE;
5509 BOOL b = allow_utf8_domains;
5510 allow_utf8_domains = TRUE;
5513 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5516 if (string_is_utf8(recipient))
5517 message_smtputf8 = TRUE;
5519 allow_utf8_domains = b;
5522 if (domain == 0 && !allow_unqualified_recipient)
5525 errmess = US"unqualified recipient address not allowed";
5528 if (recipient == NULL)
5530 if (error_handling == ERRORS_STDERR)
5532 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5533 string_printing(list[i]), errmess);
5534 exim_exit(EXIT_FAILURE);
5540 eblock.text1 = string_printing(list[i]);
5541 eblock.text2 = errmess;
5543 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5544 errors_sender_rc : EXIT_FAILURE;
5548 receive_add_recipient(recipient, -1);
5551 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5555 /* Show the recipients when debugging */
5560 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5561 if (recipients_list != NULL)
5563 debug_printf("Recipients:\n");
5564 for (i = 0; i < recipients_count; i++)
5565 debug_printf(" %s\n", recipients_list[i].address);
5569 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5570 ignored; rejecting here would just add complication, and it can just as
5571 well be done later. Allow $recipients to be visible in the ACL. */
5573 if (acl_not_smtp_start)
5575 uschar *user_msg, *log_msg;
5576 enable_dollar_recipients = TRUE;
5577 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5578 &user_msg, &log_msg);
5579 enable_dollar_recipients = FALSE;
5582 /* Pause for a while waiting for input. If none received in that time,
5583 close the logfile, if we had one open; then if we wait for a long-running
5584 datasource (months, in one use-case) log rotation will not leave us holding
5587 if (!receive_timeout)
5589 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5592 FD_ZERO(&r); FD_SET(0, &r);
5593 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5596 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5597 will just read the headers for the message, and not write anything onto the
5600 message_ended = END_NOTENDED;
5601 more = receive_msg(extract_recipients);
5603 /* more is always FALSE here (not SMTP message) when reading a message
5604 for real; when reading the headers of a message for filter testing,
5605 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5607 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5608 } /* Non-SMTP message reception */
5610 /* If this is a filter testing run, there are headers in store, but
5611 no message on the spool. Run the filtering code in testing mode, setting
5612 the domain to the qualify domain and the local part to the current user,
5613 unless they have been set by options. The prefix and suffix are left unset
5614 unless specified. The the return path is set to to the sender unless it has
5615 already been set from a return-path header in the message. */
5617 if (filter_test != FTEST_NONE)
5619 deliver_domain = (ftest_domain != NULL)?
5620 ftest_domain : qualify_domain_recipient;
5621 deliver_domain_orig = deliver_domain;
5622 deliver_localpart = (ftest_localpart != NULL)?
5623 ftest_localpart : originator_login;
5624 deliver_localpart_orig = deliver_localpart;
5625 deliver_localpart_prefix = ftest_prefix;
5626 deliver_localpart_suffix = ftest_suffix;
5627 deliver_home = originator_home;
5629 if (return_path == NULL)
5631 printf("Return-path copied from sender\n");
5632 return_path = string_copy(sender_address);
5635 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5636 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5638 receive_add_recipient(
5639 string_sprintf("%s%s%s@%s",
5640 (ftest_prefix == NULL)? US"" : ftest_prefix,
5642 (ftest_suffix == NULL)? US"" : ftest_suffix,
5643 deliver_domain), -1);
5645 printf("Recipient = %s\n", recipients_list[0].address);
5646 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5647 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5649 if (chdir("/")) /* Get away from wherever the user is running this from */
5651 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5652 exim_exit(EXIT_FAILURE);
5655 /* Now we run either a system filter test, or a user filter test, or both.
5656 In the latter case, headers added by the system filter will persist and be
5657 available to the user filter. We need to copy the filter variables
5660 if ((filter_test & FTEST_SYSTEM) != 0)
5662 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5663 exim_exit(EXIT_FAILURE);
5666 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5668 if ((filter_test & FTEST_USER) != 0)
5670 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5671 exim_exit(EXIT_FAILURE);
5674 exim_exit(EXIT_SUCCESS);
5677 /* Else act on the result of message reception. We should not get here unless
5678 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5679 will be TRUE. If it is not, check on the number of messages received in this
5682 if (!session_local_queue_only &&
5683 smtp_accept_queue_per_connection > 0 &&
5684 receive_messagecount > smtp_accept_queue_per_connection)
5686 session_local_queue_only = TRUE;
5687 queue_only_reason = 2;
5690 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5691 and queue_only_load is set, check that the load average is below it. If it is
5692 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5693 default), we put the whole session into queue_only mode. It then remains this
5694 way for any subsequent messages on the same SMTP connection. This is a
5695 deliberate choice; even though the load average may fall, it doesn't seem
5696 right to deliver later messages on the same call when not delivering earlier
5697 ones. However, there are odd cases where this is not wanted, so this can be
5698 changed by setting queue_only_load_latch false. */
5700 local_queue_only = session_local_queue_only;
5701 if (!local_queue_only && queue_only_load >= 0)
5703 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5704 if (local_queue_only)
5706 queue_only_reason = 3;
5707 if (queue_only_load_latch) session_local_queue_only = TRUE;
5711 /* If running as an MUA wrapper, all queueing options and freezing options
5715 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5717 /* Log the queueing here, when it will get a message id attached, but
5718 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5721 if (local_queue_only)
5723 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5724 switch(queue_only_reason)
5727 log_write(L_delay_delivery,
5728 LOG_MAIN, "no immediate delivery: more than %d messages "
5729 "received in one connection", smtp_accept_queue_per_connection);
5733 log_write(L_delay_delivery,
5734 LOG_MAIN, "no immediate delivery: load average %.2f",
5735 (double)load_average/1000.0);
5740 else if (queue_only_policy || deliver_freeze)
5741 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5743 /* Else do the delivery unless the ACL or local_scan() called for queue only
5744 or froze the message. Always deliver in a separate process. A fork failure is
5745 not a disaster, as the delivery will eventually happen on a subsequent queue
5746 run. The search cache must be tidied before the fork, as the parent will
5747 do it before exiting. The child will trigger a lookup failure and
5748 thereby defer the delivery if it tries to use (for example) a cached ldap
5749 connection that the parent has called unbind on. */
5756 if ((pid = fork()) == 0)
5759 close_unwanted(); /* Close unwanted file descriptors and TLS */
5760 exim_nullstd(); /* Ensure std{in,out,err} exist */
5762 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5763 mode, deliver_drop_privilege is forced TRUE). */
5765 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5767 delivery_re_exec(CEE_EXEC_EXIT);
5768 /* Control does not return here. */
5771 /* No need to re-exec */
5773 rc = deliver_message(message_id, FALSE, FALSE);
5775 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5776 EXIT_SUCCESS : EXIT_FAILURE);
5781 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5782 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5783 "process: %s", strerror(errno));
5787 release_cutthrough_connection(US"msg passed for delivery");
5789 /* In the parent, wait if synchronous delivery is required. This will
5790 always be the case in MUA wrapper mode. */
5792 if (synchronous_delivery)
5795 while (wait(&status) != pid);
5796 if ((status & 0x00ff) != 0)
5797 log_write(0, LOG_MAIN|LOG_PANIC,
5798 "process %d crashed with signal %d while delivering %s",
5799 (int)pid, status & 0x00ff, message_id);
5800 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5805 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5806 automatically reaps children (see comments above the loop), clear away any
5807 finished subprocesses here, in case there are lots of messages coming in
5808 from the same source. */
5810 #ifndef SIG_IGN_WORKS
5811 while (waitpid(-1, NULL, WNOHANG) > 0);
5815 return_path = sender_address = NULL;
5816 authenticated_sender = NULL;
5817 deliver_localpart_orig = NULL;
5818 deliver_domain_orig = NULL;
5819 deliver_host = deliver_host_address = NULL;
5820 dnslist_domain = dnslist_matched = NULL;
5821 #ifdef WITH_CONTENT_SCAN
5822 malware_name = NULL;
5824 callout_address = NULL;
5825 sending_ip_address = NULL;
5827 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5829 store_reset(reset_point);
5832 exim_exit(EXIT_SUCCESS); /* Never returns */
5833 return 0; /* To stop compiler warning */
5836 /*************************************************
5837 * read as much as requested *
5838 *************************************************/
5840 /* The syscall read(2) doesn't always returns as much as we want. For
5841 several reasons it might get less. (Not talking about signals, as syscalls
5842 are restartable). When reading from a network or pipe connection the sender
5843 might send in smaller chunks, with delays between these chunks. The read(2)
5844 may return such a chunk.
5846 The more the writer writes and the smaller the pipe between write and read is,
5847 the more we get the chance of reading leass than requested. (See bug 2130)
5849 This function read(2)s until we got all the data we *requested*.
5851 Note: This function may block. Use it only if you're sure about the
5852 amount of data you will get.
5855 fd the file descriptor to read from
5856 buffer pointer to a buffer of size len
5857 len the requested(!) amount of bytes
5859 Returns: the amount of bytes read
5862 readn(int fd, void *buffer, size_t len)
5864 void *next = buffer;
5865 void *end = buffer + len;
5869 ssize_t got = read(fd, next, end - next);
5871 /* I'm not sure if there are signals that can interrupt us,
5872 for now I assume the worst */
5873 if (got == -1 && errno == EINTR) continue;
5874 if (got <= 0) return next - buffer;