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;
1157 for (t = lpart; !needs_quote && *t != 0; t++)
1159 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1160 (*t != '.' || t == lpart || t[1] == 0);
1163 if (!needs_quote) return lpart;
1166 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1170 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1173 yield = string_cat(yield, &size, &ptr, lpart);
1176 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1177 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1178 yield = string_catn(yield, &size, &ptr, nq, 1);
1182 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1190 /*************************************************
1191 * Load readline() functions *
1192 *************************************************/
1194 /* This function is called from testing executions that read data from stdin,
1195 but only when running as the calling user. Currently, only -be does this. The
1196 function loads the readline() function library and passes back the functions.
1197 On some systems, it needs the curses library, so load that too, but try without
1198 it if loading fails. All this functionality has to be requested at build time.
1201 fn_readline_ptr pointer to where to put the readline pointer
1202 fn_addhist_ptr pointer to where to put the addhistory function
1204 Returns: the dlopen handle or NULL on failure
1208 set_readline(char * (**fn_readline_ptr)(const char *),
1209 void (**fn_addhist_ptr)(const char *))
1212 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1214 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1215 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1217 if (dlhandle != NULL)
1219 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1220 * char * readline (const char *prompt);
1221 * void add_history (const char *string);
1223 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1224 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1228 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1237 /*************************************************
1238 * Get a line from stdin for testing things *
1239 *************************************************/
1241 /* This function is called when running tests that can take a number of lines
1242 of input (for example, -be and -bt). It handles continuations and trailing
1243 spaces. And prompting and a blank line output on eof. If readline() is in use,
1244 the arguments are non-NULL and provide the relevant functions.
1247 fn_readline readline function or NULL
1248 fn_addhist addhist function or NULL
1250 Returns: pointer to dynamic memory, or NULL at end of file
1254 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1259 uschar *yield = NULL;
1261 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1265 uschar buffer[1024];
1269 char *readline_line = NULL;
1270 if (fn_readline != NULL)
1272 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1273 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1274 p = US readline_line;
1279 /* readline() not in use */
1282 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1286 /* Handle the line */
1288 ss = p + (int)Ustrlen(p);
1289 while (ss > p && isspace(ss[-1])) ss--;
1293 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1296 yield = string_catn(yield, &size, &ptr, p, ss - p);
1299 if (fn_readline != NULL) free(readline_line);
1302 /* yield can only be NULL if ss==p */
1303 if (ss == p || yield[ptr-1] != '\\')
1305 if (yield) yield[ptr] = 0;
1311 if (yield == NULL) printf("\n");
1317 /*************************************************
1318 * Output usage information for the program *
1319 *************************************************/
1321 /* This function is called when there are no recipients
1322 or a specific --help argument was added.
1325 progname information on what name we were called by
1327 Returns: DOES NOT RETURN
1331 exim_usage(uschar *progname)
1334 /* Handle specific program invocation variants */
1335 if (Ustrcmp(progname, US"-mailq") == 0)
1338 "mailq - list the contents of the mail queue\n\n"
1339 "For a list of options, see the Exim documentation.\n");
1343 /* Generic usage - we output this whatever happens */
1345 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1346 "not directly from a shell command line. Options and/or arguments control\n"
1347 "what it does when called. For a list of options, see the Exim documentation.\n");
1354 /*************************************************
1355 * Validate that the macros given are okay *
1356 *************************************************/
1358 /* Typically, Exim will drop privileges if macros are supplied. In some
1359 cases, we want to not do so.
1361 Arguments: opt_D_used - true if the commandline had a "-D" option
1362 Returns: true if trusted, false otherwise
1366 macros_trusted(BOOL opt_D_used)
1368 #ifdef WHITELIST_D_MACROS
1370 uschar *whitelisted, *end, *p, **whites, **w;
1371 int white_count, i, n;
1373 BOOL prev_char_item, found;
1378 #ifndef WHITELIST_D_MACROS
1382 /* We only trust -D overrides for some invoking users:
1383 root, the exim run-time user, the optional config owner user.
1384 I don't know why config-owner would be needed, but since they can own the
1385 config files anyway, there's no security risk to letting them override -D. */
1386 if ( ! ((real_uid == root_uid)
1387 || (real_uid == exim_uid)
1388 #ifdef CONFIGURE_OWNER
1389 || (real_uid == config_uid)
1393 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1397 /* Get a list of macros which are whitelisted */
1398 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1399 prev_char_item = FALSE;
1401 for (p = whitelisted; *p != '\0'; ++p)
1403 if (*p == ':' || isspace(*p))
1408 prev_char_item = FALSE;
1411 if (!prev_char_item)
1412 prev_char_item = TRUE;
1419 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1420 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1425 if (i == white_count)
1427 while (*p != '\0' && p < end)
1433 /* The list of commandline macros should be very short.
1434 Accept the N*M complexity. */
1435 for (m = macros; m; m = m->next) if (m->command_line)
1438 for (w = whites; *w; ++w)
1439 if (Ustrcmp(*w, m->name) == 0)
1446 if (!m->replacement)
1448 if ((len = m->replen) == 0)
1450 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1451 0, PCRE_EOPT, NULL, 0);
1454 if (n != PCRE_ERROR_NOMATCH)
1455 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1459 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1465 /*************************************************
1466 * Entry point and high-level code *
1467 *************************************************/
1469 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1470 the appropriate action. All the necessary functions are present in the one
1471 binary. I originally thought one should split it up, but it turns out that so
1472 much of the apparatus is needed in each chunk that one might as well just have
1473 it all available all the time, which then makes the coding easier as well.
1476 argc count of entries in argv
1477 argv argument strings, with argv[0] being the program name
1479 Returns: EXIT_SUCCESS if terminated successfully
1480 EXIT_FAILURE otherwise, except when a message has been sent
1481 to the sender, and -oee was given
1485 main(int argc, char **cargv)
1487 uschar **argv = USS cargv;
1488 int arg_receive_timeout = -1;
1489 int arg_smtp_receive_timeout = -1;
1490 int arg_error_handling = error_handling;
1491 int filter_sfd = -1;
1492 int filter_ufd = -1;
1495 int list_queue_option = 0;
1497 int msg_action_arg = -1;
1498 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1499 int queue_only_reason = 0;
1501 int perl_start_option = 0;
1503 int recipients_arg = argc;
1504 int sender_address_domain = 0;
1505 int test_retry_arg = -1;
1506 int test_rewrite_arg = -1;
1507 BOOL arg_queue_only = FALSE;
1508 BOOL bi_option = FALSE;
1509 BOOL checking = FALSE;
1510 BOOL count_queue = FALSE;
1511 BOOL expansion_test = FALSE;
1512 BOOL extract_recipients = FALSE;
1513 BOOL flag_G = FALSE;
1514 BOOL flag_n = FALSE;
1515 BOOL forced_delivery = FALSE;
1516 BOOL f_end_dot = FALSE;
1517 BOOL deliver_give_up = FALSE;
1518 BOOL list_queue = FALSE;
1519 BOOL list_options = FALSE;
1520 BOOL list_config = FALSE;
1521 BOOL local_queue_only;
1523 BOOL one_msg_action = FALSE;
1524 BOOL opt_D_used = FALSE;
1525 BOOL queue_only_set = FALSE;
1526 BOOL receiving_message = TRUE;
1527 BOOL sender_ident_set = FALSE;
1528 BOOL session_local_queue_only;
1530 BOOL removed_privilege = FALSE;
1531 BOOL usage_wanted = FALSE;
1532 BOOL verify_address_mode = FALSE;
1533 BOOL verify_as_sender = FALSE;
1534 BOOL version_printed = FALSE;
1535 uschar *alias_arg = NULL;
1536 uschar *called_as = US"";
1537 uschar *cmdline_syslog_name = NULL;
1538 uschar *start_queue_run_id = NULL;
1539 uschar *stop_queue_run_id = NULL;
1540 uschar *expansion_test_message = NULL;
1541 uschar *ftest_domain = NULL;
1542 uschar *ftest_localpart = NULL;
1543 uschar *ftest_prefix = NULL;
1544 uschar *ftest_suffix = NULL;
1545 uschar *log_oneline = NULL;
1546 uschar *malware_test_file = NULL;
1547 uschar *real_sender_address;
1548 uschar *originator_home = US"/";
1553 struct stat statbuf;
1554 pid_t passed_qr_pid = (pid_t)0;
1555 int passed_qr_pipe = -1;
1556 gid_t group_list[NGROUPS_MAX];
1558 /* For the -bI: flag */
1559 enum commandline_info info_flag = CMDINFO_NONE;
1560 BOOL info_stdout = FALSE;
1562 /* Possible options for -R and -S */
1564 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1566 /* Need to define this in case we need to change the environment in order
1567 to get rid of a bogus time zone. We have to make it char rather than uschar
1568 because some OS define it in /usr/include/unistd.h. */
1570 extern char **environ;
1572 /* If the Exim user and/or group and/or the configuration file owner/group were
1573 defined by ref:name at build time, we must now find the actual uid/gid values.
1574 This is a feature to make the lives of binary distributors easier. */
1576 #ifdef EXIM_USERNAME
1577 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1581 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1585 /* If ref:name uses a number as the name, route_finduser() returns
1586 TRUE with exim_uid set and pw coerced to NULL. */
1588 exim_gid = pw->pw_gid;
1589 #ifndef EXIM_GROUPNAME
1593 "exim: ref:name should specify a usercode, not a group.\n"
1594 "exim: can't let you get away with it unless you also specify a group.\n");
1601 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1607 #ifdef EXIM_GROUPNAME
1608 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1610 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1616 #ifdef CONFIGURE_OWNERNAME
1617 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1619 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1620 CONFIGURE_OWNERNAME);
1625 /* We default the system_filter_user to be the Exim run-time user, as a
1626 sane non-root value. */
1627 system_filter_uid = exim_uid;
1629 #ifdef CONFIGURE_GROUPNAME
1630 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1632 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1633 CONFIGURE_GROUPNAME);
1638 /* In the Cygwin environment, some initialization used to need doing.
1639 It was fudged in by means of this macro; now no longer but we'll leave
1640 it in case of others. */
1646 /* Check a field which is patched when we are running Exim within its
1647 testing harness; do a fast initial check, and then the whole thing. */
1649 running_in_test_harness =
1650 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1652 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1653 at the start of a program; however, it seems that some environments do not
1654 follow this. A "strange" locale can affect the formatting of timestamps, so we
1657 setlocale(LC_ALL, "C");
1659 /* Set up the default handler for timing using alarm(). */
1661 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1663 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1664 because store_malloc writes a log entry on failure. */
1666 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1668 fprintf(stderr, "exim: failed to get store for log buffer\n");
1672 /* Initialize the default log options. */
1674 bits_set(log_selector, log_selector_size, log_default);
1676 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1677 NULL when the daemon is run and the file is closed. We have to use this
1678 indirection, because some systems don't allow writing to the variable "stderr".
1681 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1683 /* Arrange for the PCRE regex library to use our store functions. Note that
1684 the normal calls are actually macros that add additional arguments for
1685 debugging purposes so we have to assign specially constructed functions here.
1686 The default is to use store in the stacking pool, but this is overridden in the
1687 regex_must_compile() function. */
1689 pcre_malloc = function_store_get;
1690 pcre_free = function_dummy_free;
1692 /* Ensure there is a big buffer for temporary use in several places. It is put
1693 in malloc store so that it can be freed for enlargement if necessary. */
1695 big_buffer = store_malloc(big_buffer_size);
1697 /* Set up the handler for the data request signal, and set the initial
1698 descriptive text. */
1700 set_process_info("initializing");
1701 os_restarting_signal(SIGUSR1, usr1_handler);
1703 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1704 in the daemon code. For the rest of Exim's uses, we ignore it. */
1706 signal(SIGHUP, SIG_IGN);
1708 /* We don't want to die on pipe errors as the code is written to handle
1709 the write error instead. */
1711 signal(SIGPIPE, SIG_IGN);
1713 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1714 set to SIG_IGN. This causes subprocesses that complete before the parent
1715 process waits for them not to hang around, so when Exim calls wait(), nothing
1716 is there. The wait() code has been made robust against this, but let's ensure
1717 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1718 ending status. We use sigaction rather than plain signal() on those OS where
1719 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1720 problem on AIX with this.) */
1724 struct sigaction act;
1725 act.sa_handler = SIG_DFL;
1726 sigemptyset(&(act.sa_mask));
1728 sigaction(SIGCHLD, &act, NULL);
1731 signal(SIGCHLD, SIG_DFL);
1734 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1739 /* Set up the version number. Set up the leading 'E' for the external form of
1740 message ids, set the pointer to the internal form, and initialize it to
1741 indicate no message being processed. */
1744 message_id_option[0] = '-';
1745 message_id_external = message_id_option + 1;
1746 message_id_external[0] = 'E';
1747 message_id = message_id_external + 1;
1750 /* Set the umask to zero so that any files Exim creates using open() are
1751 created with the modes that it specifies. NOTE: Files created with fopen() have
1752 a problem, which was not recognized till rather late (February 2006). With this
1753 umask, such files will be world writeable. (They are all content scanning files
1754 in the spool directory, which isn't world-accessible, so this is not a
1755 disaster, but it's untidy.) I don't want to change this overall setting,
1756 however, because it will interact badly with the open() calls. Instead, there's
1757 now a function called modefopen() that fiddles with the umask while calling
1762 /* Precompile the regular expression for matching a message id. Keep this in
1763 step with the code that generates ids in the accept.c module. We need to do
1764 this here, because the -M options check their arguments for syntactic validity
1765 using mac_ismsgid, which uses this. */
1768 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1770 /* Precompile the regular expression that is used for matching an SMTP error
1771 code, possibly extended, at the start of an error message. Note that the
1772 terminating whitespace character is included. */
1775 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1778 #ifdef WHITELIST_D_MACROS
1779 /* Precompile the regular expression used to filter the content of macros
1780 given to -D for permissibility. */
1782 regex_whitelisted_macro =
1783 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1786 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1788 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1789 this seems to be a generally accepted convention, since one finds symbolic
1790 links called "mailq" in standard OS configurations. */
1792 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1793 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1796 receiving_message = FALSE;
1797 called_as = US"-mailq";
1800 /* If the program is called as "rmail" treat it as equivalent to
1801 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1802 i.e. preventing a single dot on a line from terminating the message, and
1803 returning with zero return code, even in cases of error (provided an error
1804 message has been sent). */
1806 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1807 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1810 called_as = US"-rmail";
1811 errors_sender_rc = EXIT_SUCCESS;
1814 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1815 this is a smail convention. */
1817 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1818 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1820 smtp_input = smtp_batched_input = TRUE;
1821 called_as = US"-rsmtp";
1824 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1825 this is a smail convention. */
1827 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1828 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1831 receiving_message = FALSE;
1832 called_as = US"-runq";
1835 /* If the program is called as "newaliases" treat it as equivalent to
1836 "exim -bi"; this is a sendmail convention. */
1838 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1839 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1842 receiving_message = FALSE;
1843 called_as = US"-newaliases";
1846 /* Save the original effective uid for a couple of uses later. It should
1847 normally be root, but in some esoteric environments it may not be. */
1849 original_euid = geteuid();
1851 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1852 to be the same as the real ones. This makes a difference only if Exim is setuid
1853 (or setgid) to something other than root, which could be the case in some
1854 special configurations. */
1856 real_uid = getuid();
1857 real_gid = getgid();
1859 if (real_uid == root_uid)
1861 rv = setgid(real_gid);
1864 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1865 (long int)real_gid, strerror(errno));
1868 rv = setuid(real_uid);
1871 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1872 (long int)real_uid, strerror(errno));
1877 /* If neither the original real uid nor the original euid was root, Exim is
1878 running in an unprivileged state. */
1880 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1882 /* Scan the program's arguments. Some can be dealt with right away; others are
1883 simply recorded for checking and handling afterwards. Do a high-level switch
1884 on the second character (the one after '-'), to save some effort. */
1886 for (i = 1; i < argc; i++)
1888 BOOL badarg = FALSE;
1889 uschar *arg = argv[i];
1893 /* An argument not starting with '-' is the start of a recipients list;
1894 break out of the options-scanning loop. */
1902 /* An option consisting of -- terminates the options */
1904 if (Ustrcmp(arg, "--") == 0)
1906 recipients_arg = i + 1;
1910 /* Handle flagged options */
1912 switchchar = arg[1];
1915 /* Make all -ex options synonymous with -oex arguments, since that
1916 is assumed by various callers. Also make -qR options synonymous with -R
1917 options, as that seems to be required as well. Allow for -qqR too, and
1918 the same for -S options. */
1920 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1921 Ustrncmp(arg+1, "qR", 2) == 0 ||
1922 Ustrncmp(arg+1, "qS", 2) == 0)
1924 switchchar = arg[2];
1927 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1929 switchchar = arg[3];
1931 queue_2stage = TRUE;
1934 /* Make -r synonymous with -f, since it is a documented alias */
1936 else if (arg[1] == 'r') switchchar = 'f';
1938 /* Make -ov synonymous with -v */
1940 else if (Ustrcmp(arg, "-ov") == 0)
1946 /* deal with --option_aliases */
1947 else if (switchchar == '-')
1949 if (Ustrcmp(argrest, "help") == 0)
1951 usage_wanted = TRUE;
1954 else if (Ustrcmp(argrest, "version") == 0)
1961 /* High-level switch on active initial letter */
1966 /* sendmail uses -Ac and -Am to control which .cf file is used;
1969 if (*argrest == '\0') { badarg = TRUE; break; }
1972 BOOL ignore = FALSE;
1977 if (*(argrest + 1) == '\0')
1981 if (!ignore) { badarg = TRUE; break; }
1985 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1986 so has no need of it. */
1989 if (*argrest == 0) i++; /* Skip over the type */
1994 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1996 /* -bd: Run in daemon mode, awaiting SMTP connections.
1997 -bdf: Ditto, but in the foreground.
2000 if (*argrest == 'd')
2002 daemon_listen = TRUE;
2003 if (*(++argrest) == 'f') background_daemon = FALSE;
2004 else if (*argrest != 0) { badarg = TRUE; break; }
2007 /* -be: Run in expansion test mode
2008 -bem: Ditto, but read a message from a file first
2011 else if (*argrest == 'e')
2013 expansion_test = checking = TRUE;
2014 if (argrest[1] == 'm')
2016 if (++i >= argc) { badarg = TRUE; break; }
2017 expansion_test_message = argv[i];
2020 if (argrest[1] != 0) { badarg = TRUE; break; }
2023 /* -bF: Run system filter test */
2025 else if (*argrest == 'F')
2027 filter_test |= checking = FTEST_SYSTEM;
2028 if (*(++argrest) != 0) { badarg = TRUE; break; }
2029 if (++i < argc) filter_test_sfile = argv[i]; else
2031 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2036 /* -bf: Run user filter test
2037 -bfd: Set domain for filter testing
2038 -bfl: Set local part for filter testing
2039 -bfp: Set prefix for filter testing
2040 -bfs: Set suffix for filter testing
2043 else if (*argrest == 'f')
2045 if (*(++argrest) == 0)
2047 filter_test |= checking = FTEST_USER;
2048 if (++i < argc) filter_test_ufile = argv[i]; else
2050 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2058 fprintf(stderr, "exim: string expected after %s\n", arg);
2061 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2062 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2063 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2064 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2065 else { badarg = TRUE; break; }
2069 /* -bh: Host checking - an IP address must follow. */
2071 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2073 if (++i >= argc) { badarg = TRUE; break; }
2074 sender_host_address = argv[i];
2075 host_checking = checking = log_testing_mode = TRUE;
2076 host_checking_callout = argrest[1] == 'c';
2077 message_logs = FALSE;
2080 /* -bi: This option is used by sendmail to initialize *the* alias file,
2081 though it has the -oA option to specify a different file. Exim has no
2082 concept of *the* alias file, but since Sun's YP make script calls
2083 sendmail this way, some support must be provided. */
2085 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2087 /* -bI: provide information, of the type to follow after a colon.
2088 This is an Exim flag. */
2090 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2092 uschar *p = &argrest[2];
2093 info_flag = CMDINFO_HELP;
2096 if (strcmpic(p, CUS"sieve") == 0)
2098 info_flag = CMDINFO_SIEVE;
2101 else if (strcmpic(p, CUS"dscp") == 0)
2103 info_flag = CMDINFO_DSCP;
2106 else if (strcmpic(p, CUS"help") == 0)
2113 /* -bm: Accept and deliver message - the default option. Reinstate
2114 receiving_message, which got turned off for all -b options. */
2116 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2118 /* -bmalware: test the filename given for malware */
2120 else if (Ustrcmp(argrest, "malware") == 0)
2122 if (++i >= argc) { badarg = TRUE; break; }
2124 malware_test_file = argv[i];
2127 /* -bnq: For locally originating messages, do not qualify unqualified
2128 addresses. In the envelope, this causes errors; in header lines they
2131 else if (Ustrcmp(argrest, "nq") == 0)
2133 allow_unqualified_sender = FALSE;
2134 allow_unqualified_recipient = FALSE;
2137 /* -bpxx: List the contents of the mail queue, in various forms. If
2138 the option is -bpc, just a queue count is needed. Otherwise, if the
2139 first letter after p is r, then order is random. */
2141 else if (*argrest == 'p')
2143 if (*(++argrest) == 'c')
2146 if (*(++argrest) != 0) badarg = TRUE;
2150 if (*argrest == 'r')
2152 list_queue_option = 8;
2155 else list_queue_option = 0;
2159 /* -bp: List the contents of the mail queue, top-level only */
2161 if (*argrest == 0) {}
2163 /* -bpu: List the contents of the mail queue, top-level undelivered */
2165 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2167 /* -bpa: List the contents of the mail queue, including all delivered */
2169 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2171 /* Unknown after -bp[r] */
2181 /* -bP: List the configuration variables given as the address list.
2182 Force -v, so configuration errors get displayed. */
2184 else if (Ustrcmp(argrest, "P") == 0)
2186 /* -bP config: we need to setup here, because later,
2187 * when list_options is checked, the config is read already */
2188 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2191 readconf_save_config(version_string);
2195 list_options = TRUE;
2196 debug_selector |= D_v;
2197 debug_file = stderr;
2201 /* -brt: Test retry configuration lookup */
2203 else if (Ustrcmp(argrest, "rt") == 0)
2206 test_retry_arg = i + 1;
2210 /* -brw: Test rewrite configuration */
2212 else if (Ustrcmp(argrest, "rw") == 0)
2215 test_rewrite_arg = i + 1;
2219 /* -bS: Read SMTP commands on standard input, but produce no replies -
2220 all errors are reported by sending messages. */
2222 else if (Ustrcmp(argrest, "S") == 0)
2223 smtp_input = smtp_batched_input = receiving_message = TRUE;
2225 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2226 on standard output. */
2228 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2230 /* -bt: address testing mode */
2232 else if (Ustrcmp(argrest, "t") == 0)
2233 address_test_mode = checking = log_testing_mode = TRUE;
2235 /* -bv: verify addresses */
2237 else if (Ustrcmp(argrest, "v") == 0)
2238 verify_address_mode = checking = log_testing_mode = TRUE;
2240 /* -bvs: verify sender addresses */
2242 else if (Ustrcmp(argrest, "vs") == 0)
2244 verify_address_mode = checking = log_testing_mode = TRUE;
2245 verify_as_sender = TRUE;
2248 /* -bV: Print version string and support details */
2250 else if (Ustrcmp(argrest, "V") == 0)
2252 printf("Exim version %s #%s built %s\n", version_string,
2253 version_cnumber, version_date);
2254 printf("%s\n", CS version_copyright);
2255 version_printed = TRUE;
2256 show_whats_supported(stdout);
2257 log_testing_mode = TRUE;
2260 /* -bw: inetd wait mode, accept a listening socket as stdin */
2262 else if (*argrest == 'w')
2264 inetd_wait_mode = TRUE;
2265 background_daemon = FALSE;
2266 daemon_listen = TRUE;
2267 if (*(++argrest) != '\0')
2269 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2270 if (inetd_wait_timeout <= 0)
2272 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2282 /* -C: change configuration file list; ignore if it isn't really
2283 a change! Enforce a prefix check if required. */
2288 if(++i < argc) argrest = argv[i]; else
2289 { badarg = TRUE; break; }
2291 if (Ustrcmp(config_main_filelist, argrest) != 0)
2293 #ifdef ALT_CONFIG_PREFIX
2295 int len = Ustrlen(ALT_CONFIG_PREFIX);
2296 const uschar *list = argrest;
2298 while((filename = string_nextinlist(&list, &sep, big_buffer,
2299 big_buffer_size)) != NULL)
2301 if ((Ustrlen(filename) < len ||
2302 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2303 Ustrstr(filename, "/../") != NULL) &&
2304 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2306 fprintf(stderr, "-C Permission denied\n");
2311 if (real_uid != root_uid)
2313 #ifdef TRUSTED_CONFIG_LIST
2315 if (real_uid != exim_uid
2316 #ifdef CONFIGURE_OWNER
2317 && real_uid != config_uid
2320 trusted_config = FALSE;
2323 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2326 struct stat statbuf;
2328 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2329 (statbuf.st_uid != root_uid /* owner not root */
2330 #ifdef CONFIGURE_OWNER
2331 && statbuf.st_uid != config_uid /* owner not the special one */
2334 (statbuf.st_gid != root_gid /* group not root */
2335 #ifdef CONFIGURE_GROUP
2336 && statbuf.st_gid != config_gid /* group not the special one */
2338 && (statbuf.st_mode & 020) != 0 /* group writeable */
2340 (statbuf.st_mode & 2) != 0) /* world writeable */
2342 trusted_config = FALSE;
2347 /* Well, the trust list at least is up to scratch... */
2348 void *reset_point = store_get(0);
2349 uschar *trusted_configs[32];
2353 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2355 uschar *start = big_buffer, *nl;
2356 while (*start && isspace(*start))
2360 nl = Ustrchr(start, '\n');
2363 trusted_configs[nr_configs++] = string_copy(start);
2364 if (nr_configs == 32)
2372 const uschar *list = argrest;
2374 while (trusted_config && (filename = string_nextinlist(&list,
2375 &sep, big_buffer, big_buffer_size)) != NULL)
2377 for (i=0; i < nr_configs; i++)
2379 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2382 if (i == nr_configs)
2384 trusted_config = FALSE;
2388 store_reset(reset_point);
2392 /* No valid prefixes found in trust_list file. */
2393 trusted_config = FALSE;
2399 /* Could not open trust_list file. */
2400 trusted_config = FALSE;
2404 /* Not root; don't trust config */
2405 trusted_config = FALSE;
2409 config_main_filelist = argrest;
2410 config_changed = TRUE;
2415 /* -D: set up a macro definition */
2418 #ifdef DISABLE_D_OPTION
2419 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2426 uschar *s = argrest;
2429 while (isspace(*s)) s++;
2431 if (*s < 'A' || *s > 'Z')
2433 fprintf(stderr, "exim: macro name set by -D must start with "
2434 "an upper case letter\n");
2438 while (isalnum(*s) || *s == '_')
2440 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2444 if (ptr == 0) { badarg = TRUE; break; }
2445 while (isspace(*s)) s++;
2448 if (*s++ != '=') { badarg = TRUE; break; }
2449 while (isspace(*s)) s++;
2452 for (m = macros; m; m = m->next)
2453 if (Ustrcmp(m->name, name) == 0)
2455 fprintf(stderr, "exim: duplicated -D in command line\n");
2459 m = macro_create(string_copy(name), string_copy(s), TRUE);
2461 if (clmacro_count >= MAX_CLMACROS)
2463 fprintf(stderr, "exim: too many -D options on command line\n");
2466 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2472 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2473 The latter is now a no-op, retained for compatibility only. If -dd is used,
2474 debugging subprocesses of the daemon is disabled. */
2477 if (Ustrcmp(argrest, "ropcr") == 0)
2479 /* drop_cr = TRUE; */
2482 /* Use an intermediate variable so that we don't set debugging while
2483 decoding the debugging bits. */
2487 unsigned int selector = D_default;
2490 if (*argrest == 'd')
2492 debug_daemon = TRUE;
2496 decode_bits(&selector, 1, debug_notall, argrest,
2497 debug_options, debug_options_count, US"debug", 0);
2498 debug_selector = selector;
2503 /* -E: This is a local error message. This option is not intended for
2504 external use at all, but is not restricted to trusted callers because it
2505 does no harm (just suppresses certain error messages) and if Exim is run
2506 not setuid root it won't always be trusted when it generates error
2507 messages using this option. If there is a message id following -E, point
2508 message_reference at it, for logging. */
2511 local_error_message = TRUE;
2512 if (mac_ismsgid(argrest)) message_reference = argrest;
2516 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2517 option, so it looks as if historically the -oex options are also callable
2518 without the leading -o. So we have to accept them. Before the switch,
2519 anything starting -oe has been converted to -e. Exim does not support all
2520 of the sendmail error options. */
2523 if (Ustrcmp(argrest, "e") == 0)
2525 arg_error_handling = ERRORS_SENDER;
2526 errors_sender_rc = EXIT_SUCCESS;
2528 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2529 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2530 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2531 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2536 /* -F: Set sender's full name, used instead of the gecos entry from
2537 the password file. Since users can usually alter their gecos entries,
2538 there's no security involved in using this instead. The data can follow
2539 the -F or be in the next argument. */
2544 if(++i < argc) argrest = argv[i]; else
2545 { badarg = TRUE; break; }
2547 originator_name = argrest;
2548 sender_name_forced = TRUE;
2552 /* -f: Set sender's address - this value is only actually used if Exim is
2553 run by a trusted user, or if untrusted_set_sender is set and matches the
2554 address, except that the null address can always be set by any user. The
2555 test for this happens later, when the value given here is ignored when not
2556 permitted. For an untrusted user, the actual sender is still put in Sender:
2557 if it doesn't match the From: header (unless no_local_from_check is set).
2558 The data can follow the -f or be in the next argument. The -r switch is an
2559 obsolete form of -f but since there appear to be programs out there that
2560 use anything that sendmail has ever supported, better accept it - the
2561 synonymizing is done before the switch above.
2563 At this stage, we must allow domain literal addresses, because we don't
2564 know what the setting of allow_domain_literals is yet. Ditto for trailing
2565 dots and strip_trailing_dot. */
2569 int dummy_start, dummy_end;
2573 if (i+1 < argc) argrest = argv[++i]; else
2574 { badarg = TRUE; break; }
2577 sender_address = string_sprintf(""); /* Ensure writeable memory */
2580 uschar *temp = argrest + Ustrlen(argrest) - 1;
2581 while (temp >= argrest && isspace(*temp)) temp--;
2582 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2583 allow_domain_literals = TRUE;
2584 strip_trailing_dot = TRUE;
2586 allow_utf8_domains = TRUE;
2588 sender_address = parse_extract_address(argrest, &errmess,
2589 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2591 message_smtputf8 = string_is_utf8(sender_address);
2592 allow_utf8_domains = FALSE;
2594 allow_domain_literals = FALSE;
2595 strip_trailing_dot = FALSE;
2596 if (sender_address == NULL)
2598 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2599 return EXIT_FAILURE;
2602 sender_address_forced = TRUE;
2606 /* -G: sendmail invocation to specify that it's a gateway submission and
2607 sendmail may complain about problems instead of fixing them.
2608 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2609 not at this time complain about problems. */
2615 /* -h: Set the hop count for an incoming message. Exim does not currently
2616 support this; it always computes it by counting the Received: headers.
2617 To put it in will require a change to the spool header file format. */
2622 if(++i < argc) argrest = argv[i]; else
2623 { badarg = TRUE; break; }
2625 if (!isdigit(*argrest)) badarg = TRUE;
2629 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2630 not to be documented for sendmail but mailx (at least) uses it) */
2633 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2637 /* -L: set the identifier used for syslog; equivalent to setting
2638 syslog_processname in the config file, but needs to be an admin option. */
2641 if (*argrest == '\0')
2643 if(++i < argc) argrest = argv[i]; else
2644 { badarg = TRUE; break; }
2646 sz = Ustrlen(argrest);
2649 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2650 return EXIT_FAILURE;
2654 fprintf(stderr, "exim: the -L syslog name is too short\n");
2655 return EXIT_FAILURE;
2657 cmdline_syslog_name = argrest;
2661 receiving_message = FALSE;
2663 /* -MC: continue delivery of another message via an existing open
2664 file descriptor. This option is used for an internal call by the
2665 smtp transport when there is a pending message waiting to go to an
2666 address to which it has got a connection. Five subsequent arguments are
2667 required: transport name, host name, IP address, sequence number, and
2668 message_id. Transports may decline to create new processes if the sequence
2669 number gets too big. The channel is stdin. This (-MC) must be the last
2670 argument. There's a subsequent check that the real-uid is privileged.
2672 If we are running in the test harness. delay for a bit, to let the process
2673 that set this one up complete. This makes for repeatability of the logging,
2676 if (Ustrcmp(argrest, "C") == 0)
2678 union sockaddr_46 interface_sock;
2679 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2683 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2684 return EXIT_FAILURE;
2687 if (msg_action_arg >= 0)
2689 fprintf(stderr, "exim: incompatible arguments\n");
2690 return EXIT_FAILURE;
2693 continue_transport = argv[++i];
2694 continue_hostname = argv[++i];
2695 continue_host_address = argv[++i];
2696 continue_sequence = Uatoi(argv[++i]);
2697 msg_action = MSG_DELIVER;
2698 msg_action_arg = ++i;
2699 forced_delivery = TRUE;
2700 queue_run_pid = passed_qr_pid;
2701 queue_run_pipe = passed_qr_pipe;
2703 if (!mac_ismsgid(argv[i]))
2705 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2707 return EXIT_FAILURE;
2710 /* Set up $sending_ip_address and $sending_port, unless proxied */
2712 if (!continue_proxy_cipher)
2713 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2715 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2719 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2721 return EXIT_FAILURE;
2724 if (running_in_test_harness) millisleep(500);
2728 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2732 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2733 precedes -MC (see above). The flag indicates that the host to which
2734 Exim is connected has accepted an AUTH sequence. */
2736 case 'A': smtp_authenticated = TRUE; break;
2738 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2739 that exim is connected to supports the esmtp extension DSN */
2741 case 'D': smtp_peer_options |= OPTION_DSN; break;
2743 /* -MCG: set the queue name, to a non-default value */
2745 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2749 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2751 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2753 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2754 it preceded -MC (see above) */
2756 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2758 /* -MCQ: pass on the pid of the queue-running process that started
2759 this chain of deliveries and the fd of its synchronizing pipe; this
2760 is useful only when it precedes -MC (see above) */
2762 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2764 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2768 /* -MCS: set the smtp_use_size flag; this is useful only when it
2769 precedes -MC (see above) */
2771 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2774 /* -MCt: similar to -MCT below but the connection is still open
2775 via a proxy proces which handles the TLS context and coding.
2776 Require three arguments for the proxied local address and port,
2777 and the TLS cipher. */
2779 case 't': if (++i < argc) sending_ip_address = argv[i];
2781 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2783 if (++i < argc) continue_proxy_cipher = argv[i];
2787 /* -MCT: set the tls_offered flag; this is useful only when it
2788 precedes -MC (see above). The flag indicates that the host to which
2789 Exim is connected has offered TLS support. */
2791 case 'T': smtp_peer_options |= OPTION_TLS; break;
2794 default: badarg = TRUE; break;
2799 /* -M[x]: various operations on the following list of message ids:
2800 -M deliver the messages, ignoring next retry times and thawing
2801 -Mc deliver the messages, checking next retry times, no thawing
2802 -Mf freeze the messages
2803 -Mg give up on the messages
2804 -Mt thaw the messages
2805 -Mrm remove the messages
2806 In the above cases, this must be the last option. There are also the
2807 following options which are followed by a single message id, and which
2808 act on that message. Some of them use the "recipient" addresses as well.
2809 -Mar add recipient(s)
2810 -Mmad mark all recipients delivered
2811 -Mmd mark recipients(s) delivered
2813 -Mset load a message for use with -be
2815 -Mvc show copy (of whole message, in RFC 2822 format)
2820 else if (*argrest == 0)
2822 msg_action = MSG_DELIVER;
2823 forced_delivery = deliver_force_thaw = TRUE;
2825 else if (Ustrcmp(argrest, "ar") == 0)
2827 msg_action = MSG_ADD_RECIPIENT;
2828 one_msg_action = TRUE;
2830 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2831 else if (Ustrcmp(argrest, "es") == 0)
2833 msg_action = MSG_EDIT_SENDER;
2834 one_msg_action = TRUE;
2836 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2837 else if (Ustrcmp(argrest, "g") == 0)
2839 msg_action = MSG_DELIVER;
2840 deliver_give_up = TRUE;
2842 else if (Ustrcmp(argrest, "mad") == 0)
2844 msg_action = MSG_MARK_ALL_DELIVERED;
2846 else if (Ustrcmp(argrest, "md") == 0)
2848 msg_action = MSG_MARK_DELIVERED;
2849 one_msg_action = TRUE;
2851 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2852 else if (Ustrcmp(argrest, "set") == 0)
2854 msg_action = MSG_LOAD;
2855 one_msg_action = TRUE;
2857 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2858 else if (Ustrcmp(argrest, "vb") == 0)
2860 msg_action = MSG_SHOW_BODY;
2861 one_msg_action = TRUE;
2863 else if (Ustrcmp(argrest, "vc") == 0)
2865 msg_action = MSG_SHOW_COPY;
2866 one_msg_action = TRUE;
2868 else if (Ustrcmp(argrest, "vh") == 0)
2870 msg_action = MSG_SHOW_HEADER;
2871 one_msg_action = TRUE;
2873 else if (Ustrcmp(argrest, "vl") == 0)
2875 msg_action = MSG_SHOW_LOG;
2876 one_msg_action = TRUE;
2878 else { badarg = TRUE; break; }
2880 /* All the -Mxx options require at least one message id. */
2882 msg_action_arg = i + 1;
2883 if (msg_action_arg >= argc)
2885 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2886 return EXIT_FAILURE;
2889 /* Some require only message ids to follow */
2891 if (!one_msg_action)
2894 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2896 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2898 return EXIT_FAILURE;
2900 goto END_ARG; /* Remaining args are ids */
2903 /* Others require only one message id, possibly followed by addresses,
2904 which will be handled as normal arguments. */
2908 if (!mac_ismsgid(argv[msg_action_arg]))
2910 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2911 argv[msg_action_arg], arg);
2912 return EXIT_FAILURE;
2919 /* Some programs seem to call the -om option without the leading o;
2920 for sendmail it askes for "me too". Exim always does this. */
2923 if (*argrest != 0) badarg = TRUE;
2927 /* -N: don't do delivery - a debugging option that stops transports doing
2928 their thing. It implies debugging at the D_v level. */
2933 dont_deliver = TRUE;
2934 debug_selector |= D_v;
2935 debug_file = stderr;
2941 /* -n: This means "don't alias" in sendmail, apparently.
2942 For normal invocations, it has no effect.
2943 It may affect some other options. */
2949 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2950 option to the specified value. This form uses long names. We need to handle
2951 -O option=value and -Ooption=value. */
2958 fprintf(stderr, "exim: string expected after -O\n");
2966 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2969 if (*argrest == 'A')
2971 alias_arg = argrest + 1;
2972 if (alias_arg[0] == 0)
2974 if (i+1 < argc) alias_arg = argv[++i]; else
2976 fprintf(stderr, "exim: string expected after -oA\n");
2982 /* -oB: Set a connection message max value for remote deliveries */
2984 else if (*argrest == 'B')
2986 uschar *p = argrest + 1;
2989 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2991 connection_max_messages = 1;
3000 fprintf(stderr, "exim: number expected after -oB\n");
3003 connection_max_messages = Uatoi(p);
3007 /* -odb: background delivery */
3009 else if (Ustrcmp(argrest, "db") == 0)
3011 synchronous_delivery = FALSE;
3012 arg_queue_only = FALSE;
3013 queue_only_set = TRUE;
3016 /* -odf: foreground delivery (smail-compatible option); same effect as
3017 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3020 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3022 synchronous_delivery = TRUE;
3023 arg_queue_only = FALSE;
3024 queue_only_set = TRUE;
3027 /* -odq: queue only */
3029 else if (Ustrcmp(argrest, "dq") == 0)
3031 synchronous_delivery = FALSE;
3032 arg_queue_only = TRUE;
3033 queue_only_set = TRUE;
3036 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3037 but no remote delivery */
3039 else if (Ustrcmp(argrest, "dqs") == 0)
3042 arg_queue_only = FALSE;
3043 queue_only_set = TRUE;
3046 /* -oex: Sendmail error flags. As these are also accepted without the
3047 leading -o prefix, for compatibility with vacation and other callers,
3048 they are handled with -e above. */
3050 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3051 -oitrue: Another sendmail syntax for the same */
3053 else if (Ustrcmp(argrest, "i") == 0 ||
3054 Ustrcmp(argrest, "itrue") == 0)
3057 /* -oM*: Set various characteristics for an incoming message; actually
3058 acted on for trusted callers only. */
3060 else if (*argrest == 'M')
3064 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3068 /* -oMa: Set sender host address */
3070 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3072 /* -oMaa: Set authenticator name */
3074 else if (Ustrcmp(argrest, "Maa") == 0)
3075 sender_host_authenticated = argv[++i];
3077 /* -oMas: setting authenticated sender */
3079 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3081 /* -oMai: setting authenticated id */
3083 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3085 /* -oMi: Set incoming interface address */
3087 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3089 /* -oMm: Message reference */
3091 else if (Ustrcmp(argrest, "Mm") == 0)
3093 if (!mac_ismsgid(argv[i+1]))
3095 fprintf(stderr,"-oMm must be a valid message ID\n");
3098 if (!trusted_config)
3100 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3103 message_reference = argv[++i];
3106 /* -oMr: Received protocol */
3108 else if (Ustrcmp(argrest, "Mr") == 0)
3110 if (received_protocol)
3112 fprintf(stderr, "received_protocol is set already\n");
3115 else received_protocol = argv[++i];
3117 /* -oMs: Set sender host name */
3119 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3121 /* -oMt: Set sender ident */
3123 else if (Ustrcmp(argrest, "Mt") == 0)
3125 sender_ident_set = TRUE;
3126 sender_ident = argv[++i];
3129 /* Else a bad argument */
3138 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3139 seem to call this as -m (undocumented), so that is also accepted (see
3142 else if (Ustrcmp(argrest, "m") == 0) {}
3144 /* -oo: An ancient flag for old-style addresses which still seems to
3145 crop up in some calls (see in SCO). */
3147 else if (Ustrcmp(argrest, "o") == 0) {}
3149 /* -oP <name>: set pid file path for daemon */
3151 else if (Ustrcmp(argrest, "P") == 0)
3152 override_pid_file_path = argv[++i];
3154 /* -or <n>: set timeout for non-SMTP acceptance
3155 -os <n>: set timeout for SMTP acceptance */
3157 else if (*argrest == 'r' || *argrest == 's')
3159 int *tp = (*argrest == 'r')?
3160 &arg_receive_timeout : &arg_smtp_receive_timeout;
3161 if (argrest[1] == 0)
3163 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3165 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3168 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3173 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3175 else if (Ustrcmp(argrest, "X") == 0)
3176 override_local_interfaces = argv[++i];
3178 /* Unknown -o argument */
3184 /* -ps: force Perl startup; -pd force delayed Perl startup */
3188 if (*argrest == 's' && argrest[1] == 0)
3190 perl_start_option = 1;
3193 if (*argrest == 'd' && argrest[1] == 0)
3195 perl_start_option = -1;
3200 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3201 which sets the host protocol and host name */
3205 if (i+1 < argc) argrest = argv[++i]; else
3206 { badarg = TRUE; break; }
3213 if (received_protocol)
3215 fprintf(stderr, "received_protocol is set already\n");
3219 hn = Ustrchr(argrest, ':');
3222 received_protocol = argrest;
3226 int old_pool = store_pool;
3227 store_pool = POOL_PERM;
3228 received_protocol = string_copyn(argrest, hn - argrest);
3229 store_pool = old_pool;
3230 sender_host_name = hn + 1;
3237 receiving_message = FALSE;
3238 if (queue_interval >= 0)
3240 fprintf(stderr, "exim: -q specified more than once\n");
3244 /* -qq...: Do queue runs in a 2-stage manner */
3246 if (*argrest == 'q')
3248 queue_2stage = TRUE;
3252 /* -qi...: Do only first (initial) deliveries */
3254 if (*argrest == 'i')
3256 queue_run_first_delivery = TRUE;
3260 /* -qf...: Run the queue, forcing deliveries
3261 -qff..: Ditto, forcing thawing as well */
3263 if (*argrest == 'f')
3265 queue_run_force = TRUE;
3266 if (*++argrest == 'f')
3268 deliver_force_thaw = TRUE;
3273 /* -q[f][f]l...: Run the queue only on local deliveries */
3275 if (*argrest == 'l')
3277 queue_run_local = TRUE;
3281 /* -q[f][f][l][G<name>]... Work on the named queue */
3283 if (*argrest == 'G')
3286 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3287 queue_name = string_copyn(argrest, i);
3289 if (*argrest == '/') argrest++;
3292 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3293 only, optionally named, optionally starting from a given message id. */
3295 if (*argrest == 0 &&
3296 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3299 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3300 start_queue_run_id = argv[++i];
3301 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3302 stop_queue_run_id = argv[++i];
3305 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3306 forced, optionally local only, optionally named. */
3308 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3311 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3317 case 'R': /* Synonymous with -qR... */
3318 receiving_message = FALSE;
3320 /* -Rf: As -R (below) but force all deliveries,
3321 -Rff: Ditto, but also thaw all frozen messages,
3322 -Rr: String is regex
3323 -Rrf: Regex and force
3324 -Rrff: Regex and force and thaw
3326 in all cases provided there are no further characters in this
3332 for (i = 0; i < nelem(rsopts); i++)
3333 if (Ustrcmp(argrest, rsopts[i]) == 0)
3335 if (i != 2) queue_run_force = TRUE;
3336 if (i >= 2) deliver_selectstring_regex = TRUE;
3337 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3338 argrest += Ustrlen(rsopts[i]);
3342 /* -R: Set string to match in addresses for forced queue run to
3343 pick out particular messages. */
3346 deliver_selectstring = argrest;
3347 else if (i+1 < argc)
3348 deliver_selectstring = argv[++i];
3351 fprintf(stderr, "exim: string expected after -R\n");
3357 /* -r: an obsolete synonym for -f (see above) */
3360 /* -S: Like -R but works on sender. */
3362 case 'S': /* Synonymous with -qS... */
3363 receiving_message = FALSE;
3365 /* -Sf: As -S (below) but force all deliveries,
3366 -Sff: Ditto, but also thaw all frozen messages,
3367 -Sr: String is regex
3368 -Srf: Regex and force
3369 -Srff: Regex and force and thaw
3371 in all cases provided there are no further characters in this
3377 for (i = 0; i < nelem(rsopts); i++)
3378 if (Ustrcmp(argrest, rsopts[i]) == 0)
3380 if (i != 2) queue_run_force = TRUE;
3381 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3382 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3383 argrest += Ustrlen(rsopts[i]);
3387 /* -S: Set string to match in addresses for forced queue run to
3388 pick out particular messages. */
3391 deliver_selectstring_sender = argrest;
3392 else if (i+1 < argc)
3393 deliver_selectstring_sender = argv[++i];
3396 fprintf(stderr, "exim: string expected after -S\n");
3401 /* -Tqt is an option that is exclusively for use by the testing suite.
3402 It is not recognized in other circumstances. It allows for the setting up
3403 of explicit "queue times" so that various warning/retry things can be
3404 tested. Otherwise variability of clock ticks etc. cause problems. */
3407 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3408 fudged_queue_times = argv[++i];
3413 /* -t: Set flag to extract recipients from body of message. */
3416 if (*argrest == 0) extract_recipients = TRUE;
3418 /* -ti: Set flag to extract recipients from body of message, and also
3419 specify that dot does not end the message. */
3421 else if (Ustrcmp(argrest, "i") == 0)
3423 extract_recipients = TRUE;
3427 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3430 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3437 /* -U: This means "initial user submission" in sendmail, apparently. The
3438 doc claims that in future sendmail may refuse syntactically invalid
3439 messages instead of fixing them. For the moment, we just ignore it. */
3445 /* -v: verify things - this is a very low-level debugging */
3450 debug_selector |= D_v;
3451 debug_file = stderr;
3457 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3459 The -x flag tells the sendmail command that mail from a local
3460 mail program has National Language Support (NLS) extended characters
3461 in the body of the mail item. The sendmail command can send mail with
3462 extended NLS characters across networks that normally corrupts these
3465 As Exim is 8-bit clean, it just ignores this flag. */
3468 if (*argrest != 0) badarg = TRUE;
3471 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3472 logs to that file. We swallow the parameter and otherwise ignore it. */
3475 if (*argrest == '\0')
3478 fprintf(stderr, "exim: string expected after -X\n");
3484 if (*argrest == '\0')
3485 if (++i < argc) log_oneline = argv[i]; else
3487 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3492 /* All other initial characters are errors */
3497 } /* End of high-level switch statement */
3499 /* Failed to recognize the option, or syntax error */
3503 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3504 "option %s\n", arg);
3510 /* If -R or -S have been specified without -q, assume a single queue run. */
3512 if ( (deliver_selectstring || deliver_selectstring_sender)
3513 && queue_interval < 0)
3518 /* If usage_wanted is set we call the usage function - which never returns */
3519 if (usage_wanted) exim_usage(called_as);
3521 /* Arguments have been processed. Check for incompatibilities. */
3523 (smtp_input || extract_recipients || recipients_arg < argc) &&
3524 (daemon_listen || queue_interval >= 0 || bi_option ||
3525 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3526 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3529 msg_action_arg > 0 &&
3530 (daemon_listen || queue_interval > 0 || list_options ||
3531 (checking && msg_action != MSG_LOAD) ||
3532 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3535 (daemon_listen || queue_interval > 0) &&
3536 (sender_address != NULL || list_options || list_queue || checking ||
3540 daemon_listen && queue_interval == 0
3543 inetd_wait_mode && queue_interval >= 0
3547 (checking || smtp_input || extract_recipients ||
3548 filter_test != FTEST_NONE || bi_option)
3551 verify_address_mode &&
3552 (address_test_mode || smtp_input || extract_recipients ||
3553 filter_test != FTEST_NONE || bi_option)
3556 address_test_mode && (smtp_input || extract_recipients ||
3557 filter_test != FTEST_NONE || bi_option)
3560 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3564 deliver_selectstring != NULL && queue_interval < 0
3567 msg_action == MSG_LOAD &&
3568 (!expansion_test || expansion_test_message != NULL)
3572 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3576 /* If debugging is set up, set the file and the file descriptor to pass on to
3577 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3578 to run in the foreground. */
3580 if (debug_selector != 0)
3582 debug_file = stderr;
3583 debug_fd = fileno(debug_file);
3584 background_daemon = FALSE;
3585 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3586 if (debug_selector != D_v) /* -v only doesn't show this */
3588 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3589 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3591 if (!version_printed)
3592 show_whats_supported(stderr);
3596 /* When started with root privilege, ensure that the limits on the number of
3597 open files and the number of processes (where that is accessible) are
3598 sufficiently large, or are unset, in case Exim has been called from an
3599 environment where the limits are screwed down. Not all OS have the ability to
3600 change some of these limits. */
3604 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3610 #ifdef RLIMIT_NOFILE
3611 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3613 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3615 rlp.rlim_cur = rlp.rlim_max = 0;
3618 /* I originally chose 1000 as a nice big number that was unlikely to
3619 be exceeded. It turns out that some older OS have a fixed upper limit of
3622 if (rlp.rlim_cur < 1000)
3624 rlp.rlim_cur = rlp.rlim_max = 1000;
3625 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3627 rlp.rlim_cur = rlp.rlim_max = 256;
3628 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3629 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3636 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3638 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3640 rlp.rlim_cur = rlp.rlim_max = 0;
3643 #ifdef RLIM_INFINITY
3644 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3646 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3648 if (rlp.rlim_cur < 1000)
3650 rlp.rlim_cur = rlp.rlim_max = 1000;
3652 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3653 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3659 /* Exim is normally entered as root (but some special configurations are
3660 possible that don't do this). However, it always spins off sub-processes that
3661 set their uid and gid as required for local delivery. We don't want to pass on
3662 any extra groups that root may belong to, so we want to get rid of them all at
3665 We need to obey setgroups() at this stage, before possibly giving up root
3666 privilege for a changed configuration file, but later on we might need to
3667 check on the additional groups for the admin user privilege - can't do that
3668 till after reading the config, which might specify the exim gid. Therefore,
3669 save the group list here first. */
3671 group_count = getgroups(NGROUPS_MAX, group_list);
3672 if (group_count < 0)
3674 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3678 /* There is a fundamental difference in some BSD systems in the matter of
3679 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3680 known not to be different. On the "different" systems there is a single group
3681 list, and the first entry in it is the current group. On all other versions of
3682 Unix there is a supplementary group list, which is in *addition* to the current
3683 group. Consequently, to get rid of all extraneous groups on a "standard" system
3684 you pass over 0 groups to setgroups(), while on a "different" system you pass
3685 over a single group - the current group, which is always the first group in the
3686 list. Calling setgroups() with zero groups on a "different" system results in
3687 an error return. The following code should cope with both types of system.
3689 However, if this process isn't running as root, setgroups() can't be used
3690 since you have to be root to run it, even if throwing away groups. Not being
3691 root here happens only in some unusual configurations. We just ignore the
3694 if (setgroups(0, NULL) != 0)
3696 if (setgroups(1, group_list) != 0 && !unprivileged)
3698 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3703 /* If the configuration file name has been altered by an argument on the
3704 command line (either a new file name or a macro definition) and the caller is
3705 not root, or if this is a filter testing run, remove any setuid privilege the
3706 program has and run as the underlying user.
3708 The exim user is locked out of this, which severely restricts the use of -C
3711 Otherwise, set the real ids to the effective values (should be root unless run
3712 from inetd, which it can either be root or the exim uid, if one is configured).
3714 There is a private mechanism for bypassing some of this, in order to make it
3715 possible to test lots of configurations automatically, without having either to
3716 recompile each time, or to patch in an actual configuration file name and other
3717 values (such as the path name). If running in the test harness, pretend that
3718 configuration file changes and macro definitions haven't happened. */
3721 (!trusted_config || /* Config changed, or */
3722 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3723 real_uid != root_uid && /* Not root, and */
3724 !running_in_test_harness /* Not fudged */
3726 expansion_test /* expansion testing */
3728 filter_test != FTEST_NONE) /* Filter testing */
3730 setgroups(group_count, group_list);
3731 exim_setugid(real_uid, real_gid, FALSE,
3732 US"-C, -D, -be or -bf forces real uid");
3733 removed_privilege = TRUE;
3735 /* In the normal case when Exim is called like this, stderr is available
3736 and should be used for any logging information because attempts to write
3737 to the log will usually fail. To arrange this, we unset really_exim. However,
3738 if no stderr is available there is no point - we might as well have a go
3739 at the log (if it fails, syslog will be written).
3741 Note that if the invoker is Exim, the logs remain available. Messing with
3742 this causes unlogged successful deliveries. */
3744 if ((log_stderr != NULL) && (real_uid != exim_uid))
3745 really_exim = FALSE;
3748 /* Privilege is to be retained for the moment. It may be dropped later,
3749 depending on the job that this Exim process has been asked to do. For now, set
3750 the real uid to the effective so that subsequent re-execs of Exim are done by a
3753 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3755 /* If testing a filter, open the file(s) now, before wasting time doing other
3756 setups and reading the message. */
3758 if ((filter_test & FTEST_SYSTEM) != 0)
3760 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3763 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3765 return EXIT_FAILURE;
3769 if ((filter_test & FTEST_USER) != 0)
3771 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3774 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3776 return EXIT_FAILURE;
3780 /* Initialise lookup_list
3781 If debugging, already called above via version reporting.
3782 In either case, we initialise the list of available lookups while running
3783 as root. All dynamically modules are loaded from a directory which is
3784 hard-coded into the binary and is code which, if not a module, would be
3785 part of Exim already. Ability to modify the content of the directory
3786 is equivalent to the ability to modify a setuid binary!
3788 This needs to happen before we read the main configuration. */
3792 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3795 /* Read the main runtime configuration data; this gives up if there
3796 is a failure. It leaves the configuration file open so that the subsequent
3797 configuration data for delivery can be read if needed.
3799 NOTE: immediatly after opening the configuration file we change the working
3800 directory to "/"! Later we change to $spool_directory. We do it there, because
3801 during readconf_main() some expansion takes place already. */
3803 /* Store the initial cwd before we change directories */
3804 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3806 perror("exim: can't get the current working directory");
3811 -be[m] expansion test -
3812 -b[fF] filter test new
3814 -bmalware malware_test_file new
3816 -brw rewrite test new
3818 -bv[s] address verify -
3820 -bP <option> (except -bP config, which sets list_config)
3822 If any of these options is set, we suppress warnings about configuration
3823 issues (currently about tls_advertise_hosts and keep_environment not being
3826 readconf_main(checking || list_options);
3828 if (builtin_macros_create_trigger) DEBUG(D_any)
3829 debug_printf("Builtin macros created (expensive) due to config line '%.*s'\n",
3830 Ustrlen(builtin_macros_create_trigger)-1, builtin_macros_create_trigger);
3832 /* Now in directory "/" */
3834 if (cleanup_environment() == FALSE)
3835 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3838 /* If an action on specific messages is requested, or if a daemon or queue
3839 runner is being started, we need to know if Exim was called by an admin user.
3840 This is the case if the real user is root or exim, or if the real group is
3841 exim, or if one of the supplementary groups is exim or a group listed in
3842 admin_groups. We don't fail all message actions immediately if not admin_user,
3843 since some actions can be performed by non-admin users. Instead, set admin_user
3844 for later interrogation. */
3846 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3851 for (i = 0; i < group_count && !admin_user; i++)
3852 if (group_list[i] == exim_gid)
3854 else if (admin_groups)
3855 for (j = 1; j <= (int)admin_groups[0] && !admin_user; j++)
3856 if (admin_groups[j] == group_list[i])
3860 /* Another group of privileged users are the trusted users. These are root,
3861 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3862 are permitted to specify sender_addresses with -f on the command line, and
3863 other message parameters as well. */
3865 if (real_uid == root_uid || real_uid == exim_uid)
3866 trusted_caller = TRUE;
3872 for (i = 1; i <= (int)trusted_users[0] && !trusted_caller; i++)
3873 if (trusted_users[i] == real_uid)
3874 trusted_caller = TRUE;
3877 for (i = 1; i <= (int)trusted_groups[0] && !trusted_caller; i++)
3878 if (trusted_groups[i] == real_gid)
3879 trusted_caller = TRUE;
3880 else for (j = 0; j < group_count && !trusted_caller; j++)
3881 if (trusted_groups[i] == group_list[j])
3882 trusted_caller = TRUE;
3885 /* At this point, we know if the user is privileged and some command-line
3886 options become possibly imperssible, depending upon the configuration file. */
3888 if (checking && commandline_checks_require_admin && !admin_user) {
3889 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3893 /* Handle the decoding of logging options. */
3895 decode_bits(log_selector, log_selector_size, log_notall,
3896 log_selector_string, log_options, log_options_count, US"log", 0);
3901 debug_printf("configuration file is %s\n", config_main_filename);
3902 debug_printf("log selectors =");
3903 for (i = 0; i < log_selector_size; i++)
3904 debug_printf(" %08x", log_selector[i]);
3908 /* If domain literals are not allowed, check the sender address that was
3909 supplied with -f. Ditto for a stripped trailing dot. */
3911 if (sender_address != NULL)
3913 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3915 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3916 "allowed\n", sender_address);
3917 return EXIT_FAILURE;
3919 if (f_end_dot && !strip_trailing_dot)
3921 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3922 "(trailing dot not allowed)\n", sender_address);
3923 return EXIT_FAILURE;
3927 /* See if an admin user overrode our logging. */
3929 if (cmdline_syslog_name != NULL)
3933 syslog_processname = cmdline_syslog_name;
3934 log_file_path = string_copy(CUS"syslog");
3938 /* not a panic, non-privileged users should not be able to spam paniclog */
3940 "exim: you lack sufficient privilege to specify syslog process name\n");
3941 return EXIT_FAILURE;
3945 /* Paranoia check of maximum lengths of certain strings. There is a check
3946 on the length of the log file path in log.c, which will come into effect
3947 if there are any calls to write the log earlier than this. However, if we
3948 get this far but the string is very long, it is better to stop now than to
3949 carry on and (e.g.) receive a message and then have to collapse. The call to
3950 log_write() from here will cause the ultimate panic collapse if the complete
3951 file name exceeds the buffer length. */
3953 if (Ustrlen(log_file_path) > 200)
3954 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3955 "log_file_path is longer than 200 chars: aborting");
3957 if (Ustrlen(pid_file_path) > 200)
3958 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3959 "pid_file_path is longer than 200 chars: aborting");
3961 if (Ustrlen(spool_directory) > 200)
3962 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3963 "spool_directory is longer than 200 chars: aborting");
3965 /* Length check on the process name given to syslog for its TAG field,
3966 which is only permitted to be 32 characters or less. See RFC 3164. */
3968 if (Ustrlen(syslog_processname) > 32)
3969 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3970 "syslog_processname is longer than 32 chars: aborting");
3975 log_write(0, LOG_MAIN, "%s", log_oneline);
3976 return EXIT_SUCCESS;
3979 return EXIT_FAILURE;
3981 /* In some operating systems, the environment variable TMPDIR controls where
3982 temporary files are created; Exim doesn't use these (apart from when delivering
3983 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3984 If TMPDIR is found in the environment, reset it to the value defined in the
3985 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3986 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3987 EXIM_TMPDIR by the build scripts.
3993 if (environ) for (p = USS environ; *p; p++)
3994 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3996 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3997 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3999 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4004 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4005 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4006 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4007 called by a user who has set the TZ variable. This then affects the timestamps
4008 in log files and in Received: headers, and any created Date: header lines. The
4009 required timezone is settable in the configuration file, so nothing can be done
4010 about this earlier - but hopefully nothing will normally be logged earlier than
4011 this. We have to make a new environment if TZ is wrong, but don't bother if
4012 timestamps_utc is set, because then all times are in UTC anyway. */
4014 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4015 timestamps_utc = TRUE;
4018 uschar *envtz = US getenv("TZ");
4020 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4021 : timezone_string != NULL
4024 uschar **p = USS environ;
4028 if (environ) while (*p++) count++;
4029 if (!envtz) count++;
4030 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4031 if (environ) for (p = USS environ; *p; p++)
4032 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4033 if (timezone_string)
4035 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4036 sprintf(CS *newp++, "TZ=%s", timezone_string);
4041 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4042 tod_stamp(tod_log));
4046 /* Handle the case when we have removed the setuid privilege because of -C or
4047 -D. This means that the caller of Exim was not root.
4049 There is a problem if we were running as the Exim user. The sysadmin may
4050 expect this case to retain privilege because "the binary was called by the
4051 Exim user", but it hasn't, because either the -D option set macros, or the
4052 -C option set a non-trusted configuration file. There are two possibilities:
4054 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4055 to do message deliveries. Thus, the fact that it is running as a
4056 non-privileged user is plausible, and might be wanted in some special
4057 configurations. However, really_exim will have been set false when
4058 privilege was dropped, to stop Exim trying to write to its normal log
4059 files. Therefore, re-enable normal log processing, assuming the sysadmin
4060 has set up the log directory correctly.
4062 (2) If deliver_drop_privilege is not set, the configuration won't work as
4063 apparently intended, and so we log a panic message. In order to retain
4064 root for -C or -D, the caller must either be root or be invoking a
4065 trusted configuration file (when deliver_drop_privilege is false). */
4067 if ( removed_privilege
4068 && (!trusted_config || opt_D_used)
4069 && real_uid == exim_uid)
4070 if (deliver_drop_privilege)
4071 really_exim = TRUE; /* let logging work normally */
4073 log_write(0, LOG_MAIN|LOG_PANIC,
4074 "exim user lost privilege for using %s option",
4075 trusted_config? "-D" : "-C");
4077 /* Start up Perl interpreter if Perl support is configured and there is a
4078 perl_startup option, and the configuration or the command line specifies
4079 initializing starting. Note that the global variables are actually called
4080 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4083 if (perl_start_option != 0)
4084 opt_perl_at_start = (perl_start_option > 0);
4085 if (opt_perl_at_start && opt_perl_startup != NULL)
4088 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4089 errstr = init_perl(opt_perl_startup);
4092 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4093 return EXIT_FAILURE;
4095 opt_perl_started = TRUE;
4097 #endif /* EXIM_PERL */
4099 /* Log the arguments of the call if the configuration file said so. This is
4100 a debugging feature for finding out what arguments certain MUAs actually use.
4101 Don't attempt it if logging is disabled, or if listing variables or if
4102 verifying/testing addresses or expansions. */
4104 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4105 && really_exim && !list_options && !checking)
4108 uschar *p = big_buffer;
4109 Ustrcpy(p, "cwd= (failed)");
4111 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4114 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4116 for (i = 0; i < argc; i++)
4118 int len = Ustrlen(argv[i]);
4119 const uschar *printing;
4121 if (p + len + 8 >= big_buffer + big_buffer_size)
4124 log_write(0, LOG_MAIN, "%s", big_buffer);
4125 Ustrcpy(big_buffer, "...");
4128 printing = string_printing(argv[i]);
4129 if (printing[0] == 0) quote = US"\""; else
4131 const uschar *pp = printing;
4133 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4135 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4136 (p - big_buffer) - 4), printing, quote);
4139 if (LOGGING(arguments))
4140 log_write(0, LOG_MAIN, "%s", big_buffer);
4142 debug_printf("%s\n", big_buffer);
4145 /* Set the working directory to be the top-level spool directory. We don't rely
4146 on this in the code, which always uses fully qualified names, but it's useful
4147 for core dumps etc. Don't complain if it fails - the spool directory might not
4148 be generally accessible and calls with the -C option (and others) have lost
4149 privilege by now. Before the chdir, we try to ensure that the directory exists.
4152 if (Uchdir(spool_directory) != 0)
4155 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4156 dummy = /* quieten compiler */ Uchdir(spool_directory);
4157 dummy = dummy; /* yet more compiler quietening, sigh */
4160 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4161 alias file. Exim doesn't have such a concept, but this call is screwed into
4162 Sun's YP makefiles. Handle this by calling a configured script, as the real
4163 user who called Exim. The -oA option can be used to pass an argument to the
4168 (void)fclose(config_file);
4169 if (bi_command != NULL)
4173 argv[i++] = bi_command;
4174 if (alias_arg != NULL) argv[i++] = alias_arg;
4177 setgroups(group_count, group_list);
4178 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4180 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4181 (argv[1] == NULL)? US"" : argv[1]);
4183 execv(CS argv[0], (char *const *)argv);
4184 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4189 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4194 /* We moved the admin/trusted check to be immediately after reading the
4195 configuration file. We leave these prints here to ensure that syslog setup,
4196 logfile setup, and so on has already happened. */
4198 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4199 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4201 /* Only an admin user may start the daemon or force a queue run in the default
4202 configuration, but the queue run restriction can be relaxed. Only an admin
4203 user may request that a message be returned to its sender forthwith. Only an
4204 admin user may specify a debug level greater than D_v (because it might show
4205 passwords, etc. in lookup queries). Only an admin user may request a queue
4206 count. Only an admin user can use the test interface to scan for email
4207 (because Exim will be in the spool dir and able to look at mails). */
4211 BOOL debugset = (debug_selector & ~D_v) != 0;
4212 if (deliver_give_up || daemon_listen || malware_test_file ||
4213 (count_queue && queue_list_requires_admin) ||
4214 (list_queue && queue_list_requires_admin) ||
4215 (queue_interval >= 0 && prod_requires_admin) ||
4216 (debugset && !running_in_test_harness))
4218 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4223 /* If the real user is not root or the exim uid, the argument for passing
4224 in an open TCP/IP connection for another message is not permitted, nor is
4225 running with the -N option for any delivery action, unless this call to exim is
4226 one that supplied an input message, or we are using a patched exim for
4227 regression testing. */
4229 if (real_uid != root_uid && real_uid != exim_uid &&
4230 (continue_hostname != NULL ||
4232 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4233 )) && !running_in_test_harness)
4235 fprintf(stderr, "exim: Permission denied\n");
4236 return EXIT_FAILURE;
4239 /* If the caller is not trusted, certain arguments are ignored when running for
4240 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4241 Note that authority for performing certain actions on messages is tested in the
4242 queue_action() function. */
4244 if (!trusted_caller && !checking)
4246 sender_host_name = sender_host_address = interface_address =
4247 sender_ident = received_protocol = NULL;
4248 sender_host_port = interface_port = 0;
4249 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4252 /* If a sender host address is set, extract the optional port number off the
4253 end of it and check its syntax. Do the same thing for the interface address.
4254 Exim exits if the syntax is bad. */
4258 if (sender_host_address != NULL)
4259 sender_host_port = check_port(sender_host_address);
4260 if (interface_address != NULL)
4261 interface_port = check_port(interface_address);
4264 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4269 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4270 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4274 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4275 return EXIT_FAILURE;
4279 /* If an SMTP message is being received check to see if the standard input is a
4280 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4281 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4286 union sockaddr_46 inetd_sock;
4287 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4288 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4290 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4291 if (family == AF_INET || family == AF_INET6)
4293 union sockaddr_46 interface_sock;
4294 size = sizeof(interface_sock);
4296 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4297 interface_address = host_ntoa(-1, &interface_sock, NULL,
4300 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4302 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4305 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4306 NULL, &sender_host_port);
4307 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4308 "inetd is not supported when mua_wrapper is set");
4313 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4314 return EXIT_FAILURE;
4320 /* If the load average is going to be needed while receiving a message, get it
4321 now for those OS that require the first call to os_getloadavg() to be done as
4322 root. There will be further calls later for each message received. */
4324 #ifdef LOAD_AVG_NEEDS_ROOT
4325 if (receiving_message &&
4326 (queue_only_load >= 0 ||
4327 (is_inetd && smtp_load_reserve >= 0)
4330 load_average = OS_GETLOADAVG();
4334 /* The queue_only configuration option can be overridden by -odx on the command
4335 line, except that if queue_only_override is false, queue_only cannot be unset
4336 from the command line. */
4338 if (queue_only_set && (queue_only_override || arg_queue_only))
4339 queue_only = arg_queue_only;
4341 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4344 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4345 if (arg_smtp_receive_timeout >= 0)
4346 smtp_receive_timeout = arg_smtp_receive_timeout;
4348 /* If Exim was started with root privilege, unless we have already removed the
4349 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4350 except when starting the daemon or doing some kind of delivery or address
4351 testing (-bt). These are the only cases when root need to be retained. We run
4352 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4353 retained only for starting the daemon. We always do the initgroups() in this
4354 situation (controlled by the TRUE below), in order to be as close as possible
4355 to the state Exim usually runs in. */
4357 if (!unprivileged && /* originally had root AND */
4358 !removed_privilege && /* still got root AND */
4359 !daemon_listen && /* not starting the daemon */
4360 queue_interval <= 0 && /* (either kind of daemon) */
4362 deliver_drop_privilege || /* requested unprivileged */
4364 queue_interval < 0 && /* not running the queue */
4365 (msg_action_arg < 0 || /* and */
4366 msg_action != MSG_DELIVER) && /* not delivering and */
4367 (!checking || !address_test_mode) /* not address checking */
4369 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4371 /* When we are retaining a privileged uid, we still change to the exim gid. */
4376 rv = setgid(exim_gid);
4377 /* Impact of failure is that some stuff might end up with an incorrect group.
4378 We track this for failures from root, since any attempt to change privilege
4379 by root should succeed and failures should be examined. For non-root,
4380 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4381 no need to complain then. */
4383 if (!(unprivileged || removed_privilege))
4386 "exim: changing group failed: %s\n", strerror(errno));
4390 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4391 (long int)exim_gid, strerror(errno));
4394 /* Handle a request to scan a file for malware */
4395 if (malware_test_file)
4397 #ifdef WITH_CONTENT_SCAN
4399 set_process_info("scanning file for malware");
4400 result = malware_in_file(malware_test_file);
4403 printf("No malware found.\n");
4408 printf("Malware lookup returned non-okay/fail: %d\n", result);
4412 printf("Malware found: %s\n", malware_name);
4414 printf("Malware scan detected malware of unknown name.\n");
4416 printf("Malware scanning not enabled at compile time.\n");
4421 /* Handle a request to list the delivery queue */
4425 set_process_info("listing the queue");
4426 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4430 /* Handle a request to count the delivery queue */
4434 set_process_info("counting the queue");
4439 /* Handle actions on specific messages, except for the force delivery and
4440 message load actions, which are done below. Some actions take a whole list of
4441 message ids, which are known to continue up to the end of the arguments. Others
4442 take a single message id and then operate on the recipients list. */
4444 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4446 int yield = EXIT_SUCCESS;
4447 set_process_info("acting on specified messages");
4449 if (!one_msg_action)
4451 for (i = msg_action_arg; i < argc; i++)
4452 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4453 yield = EXIT_FAILURE;
4456 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4457 recipients_arg)) yield = EXIT_FAILURE;
4461 /* We used to set up here to skip reading the ACL section, on
4462 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4463 Now, since the intro of the ${acl } expansion, ACL definitions may be
4464 needed in transports so we lost the optimisation. */
4468 /* The configuration data will have been read into POOL_PERM because we won't
4469 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4470 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4471 configuration were read into POOL_MAIN, because we don't do any resets till
4472 later on. However, it seems right, and it does ensure that both pools get used.
4475 store_pool = POOL_MAIN;
4477 /* Handle the -brt option. This is for checking out retry configurations.
4478 The next three arguments are a domain name or a complete address, and
4479 optionally two error numbers. All it does is to call the function that
4480 scans the retry configuration data. */
4482 if (test_retry_arg >= 0)
4484 retry_config *yield;
4485 int basic_errno = 0;
4489 if (test_retry_arg >= argc)
4491 printf("-brt needs a domain or address argument\n");
4492 exim_exit(EXIT_FAILURE);
4494 s1 = argv[test_retry_arg++];
4497 /* If the first argument contains no @ and no . it might be a local user
4498 or it might be a single-component name. Treat as a domain. */
4500 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4502 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4503 "being \ntreated as a one-component domain, not as a local part.\n\n",
4507 /* There may be an optional second domain arg. */
4509 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4510 s2 = argv[test_retry_arg++];
4512 /* The final arg is an error name */
4514 if (test_retry_arg < argc)
4516 uschar *ss = argv[test_retry_arg];
4518 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4521 printf("%s\n", CS error);
4522 return EXIT_FAILURE;
4525 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4526 code > 100 as an error is for matching codes to the decade. Turn them into
4527 a real error code, off the decade. */
4529 if (basic_errno == ERRNO_MAIL4XX ||
4530 basic_errno == ERRNO_RCPT4XX ||
4531 basic_errno == ERRNO_DATA4XX)
4533 int code = (more_errno >> 8) & 255;
4535 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4536 else if (code > 100)
4537 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4541 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4542 printf("No retry information found\n");
4546 more_errno = yield->more_errno;
4547 printf("Retry rule: %s ", yield->pattern);
4549 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4551 printf("quota%s%s ",
4552 (more_errno > 0)? "_" : "",
4553 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4555 else if (yield->basic_errno == ECONNREFUSED)
4557 printf("refused%s%s ",
4558 (more_errno > 0)? "_" : "",
4559 (more_errno == 'M')? "MX" :
4560 (more_errno == 'A')? "A" : "");
4562 else if (yield->basic_errno == ETIMEDOUT)
4565 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4567 if (more_errno != 0) printf("_%s",
4568 (more_errno == 'M')? "MX" : "A");
4571 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4572 printf("auth_failed ");
4575 for (r = yield->rules; r; r = r->next)
4577 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4578 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4584 printf(",%d.", x/1000);
4598 exim_exit(EXIT_SUCCESS);
4601 /* Handle a request to list one or more configuration options */
4602 /* If -n was set, we suppress some information */
4606 set_process_info("listing variables");
4607 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4608 else for (i = recipients_arg; i < argc; i++)
4611 (Ustrcmp(argv[i], "router") == 0 ||
4612 Ustrcmp(argv[i], "transport") == 0 ||
4613 Ustrcmp(argv[i], "authenticator") == 0 ||
4614 Ustrcmp(argv[i], "macro") == 0 ||
4615 Ustrcmp(argv[i], "environment") == 0))
4617 readconf_print(argv[i+1], argv[i], flag_n);
4620 else readconf_print(argv[i], NULL, flag_n);
4622 exim_exit(EXIT_SUCCESS);
4627 set_process_info("listing config");
4628 readconf_print(US"config", NULL, flag_n);
4629 exim_exit(EXIT_SUCCESS);
4633 /* Initialise subsystems as required */
4634 #ifndef DISABLE_DKIM
4640 /* Handle a request to deliver one or more messages that are already on the
4641 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4642 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4644 Delivery of specific messages is typically used for a small number when
4645 prodding by hand (when the option forced_delivery will be set) or when
4646 re-execing to regain root privilege. Each message delivery must happen in a
4647 separate process, so we fork a process for each one, and run them sequentially
4648 so that debugging output doesn't get intertwined, and to avoid spawning too
4649 many processes if a long list is given. However, don't fork for the last one;
4650 this saves a process in the common case when Exim is called to deliver just one
4653 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4655 if (prod_requires_admin && !admin_user)
4657 fprintf(stderr, "exim: Permission denied\n");
4658 exim_exit(EXIT_FAILURE);
4660 set_process_info("delivering specified messages");
4661 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4662 for (i = msg_action_arg; i < argc; i++)
4667 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4668 else if ((pid = fork()) == 0)
4670 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4671 _exit(EXIT_SUCCESS);
4675 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4677 exim_exit(EXIT_FAILURE);
4681 exim_exit(EXIT_SUCCESS);
4685 /* If only a single queue run is requested, without SMTP listening, we can just
4686 turn into a queue runner, with an optional starting message id. */
4688 if (queue_interval == 0 && !daemon_listen)
4690 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4691 (start_queue_run_id == NULL)? US"" : US" starting at ",
4692 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4693 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4694 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4696 set_process_info("running the '%s' queue (single queue run)", queue_name);
4698 set_process_info("running the queue (single queue run)");
4699 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4700 exim_exit(EXIT_SUCCESS);
4704 /* Find the login name of the real user running this process. This is always
4705 needed when receiving a message, because it is written into the spool file. It
4706 may also be used to construct a from: or a sender: header, and in this case we
4707 need the user's full name as well, so save a copy of it, checked for RFC822
4708 syntax and munged if necessary, if it hasn't previously been set by the -F
4709 argument. We may try to get the passwd entry more than once, in case NIS or
4710 other delays are in evidence. Save the home directory for use in filter testing
4715 if ((pw = getpwuid(real_uid)) != NULL)
4717 originator_login = string_copy(US pw->pw_name);
4718 originator_home = string_copy(US pw->pw_dir);
4720 /* If user name has not been set by -F, set it from the passwd entry
4721 unless -f has been used to set the sender address by a trusted user. */
4723 if (originator_name == NULL)
4725 if (sender_address == NULL ||
4726 (!trusted_caller && filter_test == FTEST_NONE))
4728 uschar *name = US pw->pw_gecos;
4729 uschar *amp = Ustrchr(name, '&');
4732 /* Most Unix specify that a '&' character in the gecos field is
4733 replaced by a copy of the login name, and some even specify that
4734 the first character should be upper cased, so that's what we do. */
4739 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4740 amp - name, name, &loffset, originator_login, amp + 1);
4741 buffer[loffset] = toupper(buffer[loffset]);
4745 /* If a pattern for matching the gecos field was supplied, apply
4746 it and then expand the name string. */
4748 if (gecos_pattern != NULL && gecos_name != NULL)
4751 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4753 if (regex_match_and_setup(re, name, 0, -1))
4755 uschar *new_name = expand_string(gecos_name);
4757 if (new_name != NULL)
4759 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4760 "gecos field \"%s\"\n", new_name, name);
4763 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4764 "\"%s\": %s\n", gecos_name, expand_string_message);
4766 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4767 "gecos field \"%s\"\n", gecos_pattern, name);
4768 store_free((void *)re);
4770 originator_name = string_copy(name);
4773 /* A trusted caller has used -f but not -F */
4775 else originator_name = US"";
4778 /* Break the retry loop */
4783 if (++i > finduser_retries) break;
4787 /* If we cannot get a user login, log the incident and give up, unless the
4788 configuration specifies something to use. When running in the test harness,
4789 any setting of unknown_login overrides the actual name. */
4791 if (originator_login == NULL || running_in_test_harness)
4793 if (unknown_login != NULL)
4795 originator_login = expand_string(unknown_login);
4796 if (originator_name == NULL && unknown_username != NULL)
4797 originator_name = expand_string(unknown_username);
4798 if (originator_name == NULL) originator_name = US"";
4800 if (originator_login == NULL)
4801 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4805 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4808 originator_name = string_copy(parse_fix_phrase(originator_name,
4809 Ustrlen(originator_name), big_buffer, big_buffer_size));
4811 /* If a message is created by this call of Exim, the uid/gid of its originator
4812 are those of the caller. These values are overridden if an existing message is
4813 read in from the spool. */
4815 originator_uid = real_uid;
4816 originator_gid = real_gid;
4818 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4819 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4821 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4822 returns. We leave this till here so that the originator_ fields are available
4823 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4826 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4830 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4831 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4832 "mua_wrapper is set");
4837 /* If the sender ident has not been set (by a trusted caller) set it to
4838 the caller. This will get overwritten below for an inetd call. If a trusted
4839 caller has set it empty, unset it. */
4841 if (sender_ident == NULL) sender_ident = originator_login;
4842 else if (sender_ident[0] == 0) sender_ident = NULL;
4844 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4845 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4846 originator_* variables set. */
4848 if (test_rewrite_arg >= 0)
4850 really_exim = FALSE;
4851 if (test_rewrite_arg >= argc)
4853 printf("-brw needs an address argument\n");
4854 exim_exit(EXIT_FAILURE);
4856 rewrite_test(argv[test_rewrite_arg]);
4857 exim_exit(EXIT_SUCCESS);
4860 /* A locally-supplied message is considered to be coming from a local user
4861 unless a trusted caller supplies a sender address with -f, or is passing in the
4862 message via SMTP (inetd invocation or otherwise). */
4864 if ((sender_address == NULL && !smtp_input) ||
4865 (!trusted_caller && filter_test == FTEST_NONE))
4867 sender_local = TRUE;
4869 /* A trusted caller can supply authenticated_sender and authenticated_id
4870 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4871 defaults except when host checking. */
4873 if (authenticated_sender == NULL && !host_checking)
4874 authenticated_sender = string_sprintf("%s@%s", originator_login,
4875 qualify_domain_sender);
4876 if (authenticated_id == NULL && !host_checking)
4877 authenticated_id = originator_login;
4880 /* Trusted callers are always permitted to specify the sender address.
4881 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4882 is specified is the empty address. However, if a trusted caller does not
4883 specify a sender address for SMTP input, we leave sender_address unset. This
4884 causes the MAIL commands to be honoured. */
4886 if ((!smtp_input && sender_address == NULL) ||
4887 !receive_check_set_sender(sender_address))
4889 /* Either the caller is not permitted to set a general sender, or this is
4890 non-SMTP input and the trusted caller has not set a sender. If there is no
4891 sender, or if a sender other than <> is set, override with the originator's
4892 login (which will get qualified below), except when checking things. */
4894 if (sender_address == NULL /* No sender_address set */
4896 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4897 !checking)) /* Not running tests, including filter tests */
4899 sender_address = originator_login;
4900 sender_address_forced = FALSE;
4901 sender_address_domain = 0;
4905 /* Remember whether an untrusted caller set the sender address */
4907 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4909 /* Ensure that the sender address is fully qualified unless it is the empty
4910 address, which indicates an error message, or doesn't exist (root caller, smtp
4911 interface, no -f argument). */
4913 if (sender_address != NULL && sender_address[0] != 0 &&
4914 sender_address_domain == 0)
4915 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4916 qualify_domain_sender);
4918 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4920 /* Handle a request to verify a list of addresses, or test them for delivery.
4921 This must follow the setting of the sender address, since routers can be
4922 predicated upon the sender. If no arguments are given, read addresses from
4923 stdin. Set debug_level to at least D_v to get full output for address testing.
4926 if (verify_address_mode || address_test_mode)
4929 int flags = vopt_qualify;
4931 if (verify_address_mode)
4933 if (!verify_as_sender) flags |= vopt_is_recipient;
4934 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4939 flags |= vopt_is_recipient;
4940 debug_selector |= D_v;
4941 debug_file = stderr;
4942 debug_fd = fileno(debug_file);
4943 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4946 if (recipients_arg < argc)
4948 while (recipients_arg < argc)
4950 uschar *s = argv[recipients_arg++];
4953 BOOL finished = FALSE;
4954 uschar *ss = parse_find_address_end(s, FALSE);
4955 if (*ss == ',') *ss = 0; else finished = TRUE;
4956 test_address(s, flags, &exit_value);
4959 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4966 uschar *s = get_stdinput(NULL, NULL);
4967 if (s == NULL) break;
4968 test_address(s, flags, &exit_value);
4972 exim_exit(exit_value);
4975 /* Handle expansion checking. Either expand items on the command line, or read
4976 from stdin if there aren't any. If -Mset was specified, load the message so
4977 that its variables can be used, but restrict this facility to admin users.
4978 Otherwise, if -bem was used, read a message from stdin. */
4982 dns_init(FALSE, FALSE, FALSE);
4983 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4985 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4988 fprintf(stderr, "exim: permission denied\n");
4991 message_id = argv[msg_action_arg];
4992 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4993 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4994 printf ("Failed to load message datafile %s\n", message_id);
4995 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4996 printf ("Failed to load message %s\n", message_id);
4999 /* Read a test message from a file. We fudge it up to be on stdin, saving
5000 stdin itself for later reading of expansion strings. */
5002 else if (expansion_test_message != NULL)
5004 int save_stdin = dup(0);
5005 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5008 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5010 return EXIT_FAILURE;
5013 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5014 message_ended = END_NOTENDED;
5015 read_message_body(receive_msg(extract_recipients));
5016 message_linecount += body_linecount;
5017 (void)dup2(save_stdin, 0);
5018 (void)close(save_stdin);
5019 clearerr(stdin); /* Required by Darwin */
5022 /* Allow $recipients for this testing */
5024 enable_dollar_recipients = TRUE;
5026 /* Expand command line items */
5028 if (recipients_arg < argc)
5030 while (recipients_arg < argc)
5032 uschar *s = argv[recipients_arg++];
5033 uschar *ss = expand_string(s);
5034 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5035 else printf("%s\n", CS ss);
5043 char *(*fn_readline)(const char *) = NULL;
5044 void (*fn_addhist)(const char *) = NULL;
5047 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5053 uschar *source = get_stdinput(fn_readline, fn_addhist);
5054 if (source == NULL) break;
5055 ss = expand_string(source);
5057 printf ("Failed: %s\n", expand_string_message);
5058 else printf("%s\n", CS ss);
5062 if (dlhandle != NULL) dlclose(dlhandle);
5066 /* The data file will be open after -Mset */
5068 if (deliver_datafile >= 0)
5070 (void)close(deliver_datafile);
5071 deliver_datafile = -1;
5074 exim_exit(EXIT_SUCCESS);
5078 /* The active host name is normally the primary host name, but it can be varied
5079 for hosts that want to play several parts at once. We need to ensure that it is
5080 set for host checking, and for receiving messages. */
5082 smtp_active_hostname = primary_hostname;
5083 if (raw_active_hostname != NULL)
5085 uschar *nah = expand_string(raw_active_hostname);
5088 if (!expand_string_forcedfail)
5089 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5090 "(smtp_active_hostname): %s", raw_active_hostname,
5091 expand_string_message);
5093 else if (nah[0] != 0) smtp_active_hostname = nah;
5096 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5097 given IP address so that the blocking and relay configuration can be tested.
5098 Unless a sender_ident was set by -oMt, we discard it (the default is the
5099 caller's login name). An RFC 1413 call is made only if we are running in the
5100 test harness and an incoming interface and both ports are specified, because
5101 there is no TCP/IP call to find the ident for. */
5108 if (!sender_ident_set)
5110 sender_ident = NULL;
5111 if (running_in_test_harness && sender_host_port != 0 &&
5112 interface_address != NULL && interface_port != 0)
5113 verify_get_ident(1413);
5116 /* In case the given address is a non-canonical IPv6 address, canonicalize
5117 it. The code works for both IPv4 and IPv6, as it happens. */
5119 size = host_aton(sender_host_address, x);
5120 sender_host_address = store_get(48); /* large enough for full IPv6 */
5121 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5123 /* Now set up for testing */
5125 host_build_sender_fullhost();
5129 sender_local = FALSE;
5130 sender_host_notsocket = TRUE;
5131 debug_file = stderr;
5132 debug_fd = fileno(debug_file);
5133 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5134 "**** but without any ident (RFC 1413) callback.\n"
5135 "**** This is not for real!\n\n",
5136 sender_host_address);
5138 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5139 if (verify_check_host(&hosts_connection_nolog) == OK)
5140 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5141 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5143 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5144 because a log line has already been written for all its failure exists
5145 (usually "connection refused: <reason>") and writing another one is
5146 unnecessary clutter. */
5148 if (smtp_start_session())
5150 for (reset_point = store_get(0); ; store_reset(reset_point))
5152 if (smtp_setup_msg() <= 0) break;
5153 if (!receive_msg(FALSE)) break;
5155 return_path = sender_address = NULL;
5156 dnslist_domain = dnslist_matched = NULL;
5157 #ifndef DISABLE_DKIM
5158 dkim_cur_signer = NULL;
5161 deliver_localpart_orig = NULL;
5162 deliver_domain_orig = NULL;
5163 callout_address = sending_ip_address = NULL;
5164 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5168 exim_exit(EXIT_SUCCESS);
5172 /* Arrange for message reception if recipients or SMTP were specified;
5173 otherwise complain unless a version print (-bV) happened or this is a filter
5174 verification test or info dump.
5175 In the former case, show the configuration file name. */
5177 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5179 if (version_printed)
5181 printf("Configuration file is %s\n", config_main_filename);
5182 return EXIT_SUCCESS;
5185 if (info_flag != CMDINFO_NONE)
5187 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5188 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5191 if (filter_test == FTEST_NONE)
5192 exim_usage(called_as);
5196 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5197 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5198 that we are not called from inetd, because that is rejected above. The
5199 following configuration settings are forced here:
5201 (1) Synchronous delivery (-odi)
5202 (2) Errors to stderr (-oep == -oeq)
5203 (3) No parallel remote delivery
5204 (4) Unprivileged delivery
5206 We don't force overall queueing options because there are several of them;
5207 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5208 to override any SMTP queueing. */
5212 synchronous_delivery = TRUE;
5213 arg_error_handling = ERRORS_STDERR;
5214 remote_max_parallel = 1;
5215 deliver_drop_privilege = TRUE;
5217 queue_smtp_domains = NULL;
5219 message_utf8_downconvert = -1; /* convert-if-needed */
5224 /* Prepare to accept one or more new messages on the standard input. When a
5225 message has been read, its id is returned in message_id[]. If doing immediate
5226 delivery, we fork a delivery process for each received message, except for the
5227 last one, where we can save a process switch.
5229 It is only in non-smtp mode that error_handling is allowed to be changed from
5230 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5231 sendmail error modes other than -oem ever actually used? Later: yes.) */
5233 if (!smtp_input) error_handling = arg_error_handling;
5235 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5236 logging being sent down the socket and make an identd call to get the
5241 (void)fclose(stderr);
5242 exim_nullstd(); /* Re-open to /dev/null */
5243 verify_get_ident(IDENT_PORT);
5244 host_build_sender_fullhost();
5245 set_process_info("handling incoming connection from %s via inetd",
5249 /* If the sender host address has been set, build sender_fullhost if it hasn't
5250 already been done (which it will have been for inetd). This caters for the
5251 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5252 so that the test for IP options is skipped for -bs input. */
5254 if (sender_host_address != NULL && sender_fullhost == NULL)
5256 host_build_sender_fullhost();
5257 set_process_info("handling incoming connection from %s via -oMa",
5259 sender_host_notsocket = TRUE;
5262 /* Otherwise, set the sender host as unknown except for inetd calls. This
5263 prevents host checking in the case of -bs not from inetd and also for -bS. */
5265 else if (!is_inetd) sender_host_unknown = TRUE;
5267 /* If stdout does not exist, then dup stdin to stdout. This can happen
5268 if exim is started from inetd. In this case fd 0 will be set to the socket,
5269 but fd 1 will not be set. This also happens for passed SMTP channels. */
5271 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5273 /* Set up the incoming protocol name and the state of the program. Root is
5274 allowed to force received protocol via the -oMr option above. If we have come
5275 via inetd, the process info has already been set up. We don't set
5276 received_protocol here for smtp input, as it varies according to
5277 batch/HELO/EHLO/AUTH/TLS. */
5281 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5282 smtp_batched_input? "batched " : "",
5283 (sender_address!= NULL)? sender_address : originator_login);
5287 int old_pool = store_pool;
5288 store_pool = POOL_PERM;
5289 if (!received_protocol)
5290 received_protocol = string_sprintf("local%s", called_as);
5291 store_pool = old_pool;
5292 set_process_info("accepting a local non-SMTP message from <%s>",
5296 /* Initialize the session_local_queue-only flag (this will be ignored if
5297 mua_wrapper is set) */
5300 session_local_queue_only = queue_only;
5302 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5303 the spool if so configured. On failure, we must not attempt to send an error
5304 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5305 error code is given.) */
5307 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5309 fprintf(stderr, "exim: insufficient disk space\n");
5310 return EXIT_FAILURE;
5313 /* If this is smtp input of any kind, real or batched, handle the start of the
5316 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5317 because a log line has already been written for all its failure exists
5318 (usually "connection refused: <reason>") and writing another one is
5319 unnecessary clutter. */
5325 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5326 if (verify_check_host(&hosts_connection_nolog) == OK)
5327 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5328 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5329 if (!smtp_start_session())
5332 exim_exit(EXIT_SUCCESS);
5336 /* Otherwise, set up the input size limit here. */
5340 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5341 if (expand_string_message)
5342 if (thismessage_size_limit == -1)
5343 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5344 "message_size_limit: %s", expand_string_message);
5346 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5347 "message_size_limit: %s", expand_string_message);
5350 /* Loop for several messages when reading SMTP input. If we fork any child
5351 processes, we don't want to wait for them unless synchronous delivery is
5352 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5353 same as SIG_DFL, despite the fact that documentation often lists the default as
5354 "ignore". This is a confusing area. This is what I know:
5356 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5357 processes that complete simply to go away without ever becoming defunct. You
5358 can't then wait for them - but we don't want to wait for them in the
5359 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5360 happen for all OS (e.g. *BSD is different).
5362 But that's not the end of the story. Some (many? all?) systems have the
5363 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5364 has by default, so it seems that the difference is merely one of default
5365 (compare restarting vs non-restarting signals).
5367 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5368 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5369 of the loop below. Paranoia rules.
5371 February 2003: That's *still* not the end of the story. There are now versions
5372 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5373 process then calls waitpid(), a grumble is written to the system log, because
5374 this is logically inconsistent. In other words, it doesn't like the paranoia.
5375 As a consequence of this, the waitpid() below is now excluded if we are sure
5376 that SIG_IGN works. */
5378 if (!synchronous_delivery)
5381 struct sigaction act;
5382 act.sa_handler = SIG_IGN;
5383 sigemptyset(&(act.sa_mask));
5384 act.sa_flags = SA_NOCLDWAIT;
5385 sigaction(SIGCHLD, &act, NULL);
5387 signal(SIGCHLD, SIG_IGN);
5391 /* Save the current store pool point, for resetting at the start of
5392 each message, and save the real sender address, if any. */
5394 reset_point = store_get(0);
5395 real_sender_address = sender_address;
5397 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5398 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5405 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5406 input and build the recipients list, before calling receive_msg() to read the
5407 message proper. Whatever sender address is given in the SMTP transaction is
5408 often ignored for local senders - we use the actual sender, which is normally
5409 either the underlying user running this process or a -f argument provided by
5410 a trusted caller. It is saved in real_sender_address. The test for whether to
5411 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5416 if ((rc = smtp_setup_msg()) > 0)
5418 if (real_sender_address != NULL &&
5419 !receive_check_set_sender(sender_address))
5421 sender_address = raw_sender = real_sender_address;
5422 sender_address_unrewritten = NULL;
5425 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5426 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5427 the very end. The result of the ACL is ignored (as for other non-SMTP
5428 messages). It is run for its potential side effects. */
5430 if (smtp_batched_input && acl_not_smtp_start != NULL)
5432 uschar *user_msg, *log_msg;
5433 enable_dollar_recipients = TRUE;
5434 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5435 &user_msg, &log_msg);
5436 enable_dollar_recipients = FALSE;
5439 /* Now get the data for the message */
5441 more = receive_msg(extract_recipients);
5442 if (message_id[0] == 0)
5444 cancel_cutthrough_connection(TRUE, US"receive dropped");
5445 if (more) goto moreloop;
5446 smtp_log_no_mail(); /* Log no mail if configured */
5447 exim_exit(EXIT_FAILURE);
5452 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5453 smtp_log_no_mail(); /* Log no mail if configured */
5454 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5458 /* In the non-SMTP case, we have all the information from the command
5459 line, but must process it in case it is in the more general RFC822
5460 format, and in any case, to detect syntax errors. Also, it appears that
5461 the use of comma-separated lists as single arguments is common, so we
5462 had better support them. */
5468 int count = argc - recipients_arg;
5469 uschar **list = argv + recipients_arg;
5471 /* These options cannot be changed dynamically for non-SMTP messages */
5473 active_local_sender_retain = local_sender_retain;
5474 active_local_from_check = local_from_check;
5476 /* Save before any rewriting */
5478 raw_sender = string_copy(sender_address);
5480 /* Loop for each argument */
5482 for (i = 0; i < count; i++)
5484 int start, end, domain;
5486 uschar *s = list[i];
5488 /* Loop for each comma-separated address */
5492 BOOL finished = FALSE;
5494 uschar *ss = parse_find_address_end(s, FALSE);
5496 if (*ss == ',') *ss = 0; else finished = TRUE;
5498 /* Check max recipients - if -t was used, these aren't recipients */
5500 if (recipients_max > 0 && ++rcount > recipients_max &&
5501 !extract_recipients)
5502 if (error_handling == ERRORS_STDERR)
5504 fprintf(stderr, "exim: too many recipients\n");
5505 exim_exit(EXIT_FAILURE);
5510 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5511 errors_sender_rc : EXIT_FAILURE;
5516 BOOL b = allow_utf8_domains;
5517 allow_utf8_domains = TRUE;
5520 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5523 if (string_is_utf8(recipient))
5524 message_smtputf8 = TRUE;
5526 allow_utf8_domains = b;
5529 if (domain == 0 && !allow_unqualified_recipient)
5532 errmess = US"unqualified recipient address not allowed";
5535 if (recipient == NULL)
5537 if (error_handling == ERRORS_STDERR)
5539 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5540 string_printing(list[i]), errmess);
5541 exim_exit(EXIT_FAILURE);
5547 eblock.text1 = string_printing(list[i]);
5548 eblock.text2 = errmess;
5550 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5551 errors_sender_rc : EXIT_FAILURE;
5555 receive_add_recipient(recipient, -1);
5558 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5562 /* Show the recipients when debugging */
5567 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5568 if (recipients_list != NULL)
5570 debug_printf("Recipients:\n");
5571 for (i = 0; i < recipients_count; i++)
5572 debug_printf(" %s\n", recipients_list[i].address);
5576 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5577 ignored; rejecting here would just add complication, and it can just as
5578 well be done later. Allow $recipients to be visible in the ACL. */
5580 if (acl_not_smtp_start)
5582 uschar *user_msg, *log_msg;
5583 enable_dollar_recipients = TRUE;
5584 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5585 &user_msg, &log_msg);
5586 enable_dollar_recipients = FALSE;
5589 /* Pause for a while waiting for input. If none received in that time,
5590 close the logfile, if we had one open; then if we wait for a long-running
5591 datasource (months, in one use-case) log rotation will not leave us holding
5594 if (!receive_timeout)
5596 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5599 FD_ZERO(&r); FD_SET(0, &r);
5600 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5603 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5604 will just read the headers for the message, and not write anything onto the
5607 message_ended = END_NOTENDED;
5608 more = receive_msg(extract_recipients);
5610 /* more is always FALSE here (not SMTP message) when reading a message
5611 for real; when reading the headers of a message for filter testing,
5612 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5614 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5615 } /* Non-SMTP message reception */
5617 /* If this is a filter testing run, there are headers in store, but
5618 no message on the spool. Run the filtering code in testing mode, setting
5619 the domain to the qualify domain and the local part to the current user,
5620 unless they have been set by options. The prefix and suffix are left unset
5621 unless specified. The the return path is set to to the sender unless it has
5622 already been set from a return-path header in the message. */
5624 if (filter_test != FTEST_NONE)
5626 deliver_domain = (ftest_domain != NULL)?
5627 ftest_domain : qualify_domain_recipient;
5628 deliver_domain_orig = deliver_domain;
5629 deliver_localpart = (ftest_localpart != NULL)?
5630 ftest_localpart : originator_login;
5631 deliver_localpart_orig = deliver_localpart;
5632 deliver_localpart_prefix = ftest_prefix;
5633 deliver_localpart_suffix = ftest_suffix;
5634 deliver_home = originator_home;
5636 if (return_path == NULL)
5638 printf("Return-path copied from sender\n");
5639 return_path = string_copy(sender_address);
5642 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5643 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5645 receive_add_recipient(
5646 string_sprintf("%s%s%s@%s",
5647 (ftest_prefix == NULL)? US"" : ftest_prefix,
5649 (ftest_suffix == NULL)? US"" : ftest_suffix,
5650 deliver_domain), -1);
5652 printf("Recipient = %s\n", recipients_list[0].address);
5653 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5654 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5656 if (chdir("/")) /* Get away from wherever the user is running this from */
5658 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5659 exim_exit(EXIT_FAILURE);
5662 /* Now we run either a system filter test, or a user filter test, or both.
5663 In the latter case, headers added by the system filter will persist and be
5664 available to the user filter. We need to copy the filter variables
5667 if ((filter_test & FTEST_SYSTEM) != 0)
5669 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5670 exim_exit(EXIT_FAILURE);
5673 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5675 if ((filter_test & FTEST_USER) != 0)
5677 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5678 exim_exit(EXIT_FAILURE);
5681 exim_exit(EXIT_SUCCESS);
5684 /* Else act on the result of message reception. We should not get here unless
5685 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5686 will be TRUE. If it is not, check on the number of messages received in this
5689 if (!session_local_queue_only &&
5690 smtp_accept_queue_per_connection > 0 &&
5691 receive_messagecount > smtp_accept_queue_per_connection)
5693 session_local_queue_only = TRUE;
5694 queue_only_reason = 2;
5697 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5698 and queue_only_load is set, check that the load average is below it. If it is
5699 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5700 default), we put the whole session into queue_only mode. It then remains this
5701 way for any subsequent messages on the same SMTP connection. This is a
5702 deliberate choice; even though the load average may fall, it doesn't seem
5703 right to deliver later messages on the same call when not delivering earlier
5704 ones. However, there are odd cases where this is not wanted, so this can be
5705 changed by setting queue_only_load_latch false. */
5707 local_queue_only = session_local_queue_only;
5708 if (!local_queue_only && queue_only_load >= 0)
5710 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5711 if (local_queue_only)
5713 queue_only_reason = 3;
5714 if (queue_only_load_latch) session_local_queue_only = TRUE;
5718 /* If running as an MUA wrapper, all queueing options and freezing options
5722 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5724 /* Log the queueing here, when it will get a message id attached, but
5725 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5728 if (local_queue_only)
5730 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5731 switch(queue_only_reason)
5734 log_write(L_delay_delivery,
5735 LOG_MAIN, "no immediate delivery: more than %d messages "
5736 "received in one connection", smtp_accept_queue_per_connection);
5740 log_write(L_delay_delivery,
5741 LOG_MAIN, "no immediate delivery: load average %.2f",
5742 (double)load_average/1000.0);
5747 else if (queue_only_policy || deliver_freeze)
5748 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5750 /* Else do the delivery unless the ACL or local_scan() called for queue only
5751 or froze the message. Always deliver in a separate process. A fork failure is
5752 not a disaster, as the delivery will eventually happen on a subsequent queue
5753 run. The search cache must be tidied before the fork, as the parent will
5754 do it before exiting. The child will trigger a lookup failure and
5755 thereby defer the delivery if it tries to use (for example) a cached ldap
5756 connection that the parent has called unbind on. */
5763 if ((pid = fork()) == 0)
5766 close_unwanted(); /* Close unwanted file descriptors and TLS */
5767 exim_nullstd(); /* Ensure std{in,out,err} exist */
5769 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5770 mode, deliver_drop_privilege is forced TRUE). */
5772 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5774 delivery_re_exec(CEE_EXEC_EXIT);
5775 /* Control does not return here. */
5778 /* No need to re-exec */
5780 rc = deliver_message(message_id, FALSE, FALSE);
5782 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5783 EXIT_SUCCESS : EXIT_FAILURE);
5788 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5789 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5790 "process: %s", strerror(errno));
5794 release_cutthrough_connection(US"msg passed for delivery");
5796 /* In the parent, wait if synchronous delivery is required. This will
5797 always be the case in MUA wrapper mode. */
5799 if (synchronous_delivery)
5802 while (wait(&status) != pid);
5803 if ((status & 0x00ff) != 0)
5804 log_write(0, LOG_MAIN|LOG_PANIC,
5805 "process %d crashed with signal %d while delivering %s",
5806 (int)pid, status & 0x00ff, message_id);
5807 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5812 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5813 automatically reaps children (see comments above the loop), clear away any
5814 finished subprocesses here, in case there are lots of messages coming in
5815 from the same source. */
5817 #ifndef SIG_IGN_WORKS
5818 while (waitpid(-1, NULL, WNOHANG) > 0);
5822 return_path = sender_address = NULL;
5823 authenticated_sender = NULL;
5824 deliver_localpart_orig = NULL;
5825 deliver_domain_orig = NULL;
5826 deliver_host = deliver_host_address = NULL;
5827 dnslist_domain = dnslist_matched = NULL;
5828 #ifdef WITH_CONTENT_SCAN
5829 malware_name = NULL;
5831 callout_address = NULL;
5832 sending_ip_address = NULL;
5834 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5836 store_reset(reset_point);
5839 exim_exit(EXIT_SUCCESS); /* Never returns */
5840 return 0; /* To stop compiler warning */
5843 /*************************************************
5844 * read as much as requested *
5845 *************************************************/
5847 /* The syscall read(2) doesn't always returns as much as we want. For
5848 several reasons it might get less. (Not talking about signals, as syscalls
5849 are restartable). When reading from a network or pipe connection the sender
5850 might send in smaller chunks, with delays between these chunks. The read(2)
5851 may return such a chunk.
5853 The more the writer writes and the smaller the pipe between write and read is,
5854 the more we get the chance of reading leass than requested. (See bug 2130)
5856 This function read(2)s until we got all the data we *requested*.
5858 Note: This function may block. Use it only if you're sure about the
5859 amount of data you will get.
5862 fd the file descriptor to read from
5863 buffer pointer to a buffer of size len
5864 len the requested(!) amount of bytes
5866 Returns: the amount of bytes read
5869 readn(int fd, void *buffer, size_t len)
5871 void *next = buffer;
5872 void *end = buffer + len;
5876 ssize_t got = read(fd, next, end - next);
5878 /* I'm not sure if there are signals that can interrupt us,
5879 for now I assume the worst */
5880 if (got == -1 && errno == EINTR) continue;
5881 if (got <= 0) return next - buffer;