1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
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
661 exim_exit(int rc, const uschar * process)
665 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
666 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
667 process ? "(" : "", process, process ? ") " : "", rc);
674 /*************************************************
675 * Extract port from host address *
676 *************************************************/
678 /* Called to extract the port from the values given to -oMa and -oMi.
679 It also checks the syntax of the address, and terminates it before the
680 port data when a port is extracted.
683 address the address, with possible port on the end
685 Returns: the port, or zero if there isn't one
686 bombs out on a syntax error
690 check_port(uschar *address)
692 int port = host_address_extract_port(address);
693 if (string_is_ip_address(address, NULL) == 0)
695 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
703 /*************************************************
704 * Test/verify an address *
705 *************************************************/
707 /* This function is called by the -bv and -bt code. It extracts a working
708 address from a full RFC 822 address. This isn't really necessary per se, but it
709 has the effect of collapsing source routes.
713 flags flag bits for verify_address()
714 exit_value to be set for failures
720 test_address(uschar *s, int flags, int *exit_value)
722 int start, end, domain;
723 uschar *parse_error = NULL;
724 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
728 fprintf(stdout, "syntax error: %s\n", parse_error);
733 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
734 -1, -1, NULL, NULL, NULL);
735 if (rc == FAIL) *exit_value = 2;
736 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
742 /*************************************************
743 * Show supported features *
744 *************************************************/
746 /* This function is called for -bV/--version and for -d to output the optional
747 features of the current Exim binary.
749 Arguments: a FILE for printing
754 show_whats_supported(FILE *f)
758 #ifdef DB_VERSION_STRING
759 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
760 #elif defined(BTREEVERSION) && defined(HASHVERSION)
762 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
764 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
766 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
767 fprintf(f, "Probably ndbm\n");
768 #elif defined(USE_TDB)
769 fprintf(f, "Using tdb\n");
772 fprintf(f, "Probably GDBM (native mode)\n");
774 fprintf(f, "Probably GDBM (compatibility mode)\n");
778 fprintf(f, "Support for:");
779 #ifdef SUPPORT_CRYPTEQ
780 fprintf(f, " crypteq");
783 fprintf(f, " iconv()");
788 #ifdef HAVE_SETCLASSRESOURCES
789 fprintf(f, " use_setclassresources");
798 fprintf(f, " Expand_dlfunc");
800 #ifdef USE_TCP_WRAPPERS
801 fprintf(f, " TCPwrappers");
805 fprintf(f, " GnuTLS");
807 fprintf(f, " OpenSSL");
810 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
811 fprintf(f, " translate_ip_address");
813 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
814 fprintf(f, " move_frozen_messages");
816 #ifdef WITH_CONTENT_SCAN
817 fprintf(f, " Content_Scanning");
822 #ifndef DISABLE_DNSSEC
823 fprintf(f, " DNSSEC");
825 #ifndef DISABLE_EVENT
826 fprintf(f, " Event");
838 fprintf(f, " PROXY");
841 fprintf(f, " SOCKS");
845 if (tcp_fastopen_ok) fprintf(f, " TCP_Fast_Open");
847 #ifdef EXPERIMENTAL_LMDB
848 fprintf(f, " Experimental_LMDB");
850 #ifdef EXPERIMENTAL_QUEUEFILE
851 fprintf(f, " Experimental_QUEUEFILE");
853 #ifdef EXPERIMENTAL_SPF
854 fprintf(f, " Experimental_SPF");
856 #ifdef EXPERIMENTAL_SRS
857 fprintf(f, " Experimental_SRS");
859 #ifdef EXPERIMENTAL_BRIGHTMAIL
860 fprintf(f, " Experimental_Brightmail");
862 #ifdef EXPERIMENTAL_DANE
863 fprintf(f, " Experimental_DANE");
865 #ifdef EXPERIMENTAL_DCC
866 fprintf(f, " Experimental_DCC");
868 #ifdef EXPERIMENTAL_DMARC
869 fprintf(f, " Experimental_DMARC");
871 #ifdef EXPERIMENTAL_DSN_INFO
872 fprintf(f, " Experimental_DSN_info");
876 fprintf(f, "Lookups (built-in):");
877 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
878 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
880 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
883 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
884 fprintf(f, " dbm dbmjz dbmnz");
886 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
887 fprintf(f, " dnsdb");
889 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
890 fprintf(f, " dsearch");
892 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
893 fprintf(f, " ibase");
895 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
896 fprintf(f, " ldap ldapdn ldapm");
898 #ifdef EXPERIMENTAL_LMDB
901 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
902 fprintf(f, " mysql");
904 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
905 fprintf(f, " nis nis0");
907 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
908 fprintf(f, " nisplus");
910 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
911 fprintf(f, " oracle");
913 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
914 fprintf(f, " passwd");
916 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
917 fprintf(f, " pgsql");
919 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
920 fprintf(f, " redis");
922 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
923 fprintf(f, " sqlite");
925 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
926 fprintf(f, " testdb");
928 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
929 fprintf(f, " whoson");
933 fprintf(f, "Authenticators:");
935 fprintf(f, " cram_md5");
937 #ifdef AUTH_CYRUS_SASL
938 fprintf(f, " cyrus_sasl");
941 fprintf(f, " dovecot");
944 fprintf(f, " gsasl");
946 #ifdef AUTH_HEIMDAL_GSSAPI
947 fprintf(f, " heimdal_gssapi");
949 #ifdef AUTH_PLAINTEXT
950 fprintf(f, " plaintext");
960 fprintf(f, "Routers:");
962 fprintf(f, " accept");
964 #ifdef ROUTER_DNSLOOKUP
965 fprintf(f, " dnslookup");
967 #ifdef ROUTER_IPLITERAL
968 fprintf(f, " ipliteral");
970 #ifdef ROUTER_IPLOOKUP
971 fprintf(f, " iplookup");
973 #ifdef ROUTER_MANUALROUTE
974 fprintf(f, " manualroute");
976 #ifdef ROUTER_QUERYPROGRAM
977 fprintf(f, " queryprogram");
979 #ifdef ROUTER_REDIRECT
980 fprintf(f, " redirect");
984 fprintf(f, "Transports:");
985 #ifdef TRANSPORT_APPENDFILE
986 fprintf(f, " appendfile");
987 #ifdef SUPPORT_MAILDIR
988 fprintf(f, "/maildir");
990 #ifdef SUPPORT_MAILSTORE
991 fprintf(f, "/mailstore");
997 #ifdef TRANSPORT_AUTOREPLY
998 fprintf(f, " autoreply");
1000 #ifdef TRANSPORT_LMTP
1001 fprintf(f, " lmtp");
1003 #ifdef TRANSPORT_PIPE
1004 fprintf(f, " pipe");
1006 #ifdef EXPERIMENTAL_QUEUEFILE
1007 fprintf(f, " queuefile");
1009 #ifdef TRANSPORT_SMTP
1010 fprintf(f, " smtp");
1014 if (fixed_never_users[0] > 0)
1017 fprintf(f, "Fixed never_users: ");
1018 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1019 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1020 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1023 fprintf(f, "Configure owner: %d:%d\n", config_uid, config_gid);
1025 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1027 /* Everything else is details which are only worth reporting when debugging.
1028 Perhaps the tls_version_report should move into this too. */
1033 /* clang defines __GNUC__ (at least, for me) so test for it first */
1034 #if defined(__clang__)
1035 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1036 #elif defined(__GNUC__)
1037 fprintf(f, "Compiler: GCC [%s]\n",
1041 "? unknown version ?"
1045 fprintf(f, "Compiler: <unknown>\n");
1048 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1049 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1050 __GLIBC__, __GLIBC_MINOR__);
1051 if (__GLIBC_PREREQ(2, 1))
1052 fprintf(f, " Runtime: %s\n",
1053 gnu_get_libc_version());
1057 tls_version_report(f);
1060 utf8_version_report(f);
1063 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1064 if (authi->version_report)
1065 (*authi->version_report)(f);
1067 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1068 characters; unless it's an ancient version of PCRE in which case it
1070 #ifndef PCRE_PRERELEASE
1071 # define PCRE_PRERELEASE
1074 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1075 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1077 PCRE_MAJOR, PCRE_MINOR,
1078 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1081 #undef EXPAND_AND_QUOTE
1084 for (i = 0; i < lookup_list_count; i++)
1085 if (lookup_list[i]->version_report)
1086 lookup_list[i]->version_report(f);
1088 #ifdef WHITELIST_D_MACROS
1089 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1091 fprintf(f, "WHITELIST_D_MACROS unset\n");
1093 #ifdef TRUSTED_CONFIG_LIST
1094 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1096 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1103 /*************************************************
1104 * Show auxiliary information about Exim *
1105 *************************************************/
1108 show_exim_information(enum commandline_info request, FILE *stream)
1115 fprintf(stream, "Oops, something went wrong.\n");
1119 "The -bI: flag takes a string indicating which information to provide.\n"
1120 "If the string is not recognised, you'll get this help (on stderr).\n"
1122 " exim -bI:help this information\n"
1123 " exim -bI:dscp list of known dscp value keywords\n"
1124 " exim -bI:sieve list of supported sieve extensions\n"
1128 for (pp = exim_sieve_extension_list; *pp; ++pp)
1129 fprintf(stream, "%s\n", *pp);
1132 dscp_list_to_stream(stream);
1138 /*************************************************
1139 * Quote a local part *
1140 *************************************************/
1142 /* This function is used when a sender address or a From: or Sender: header
1143 line is being created from the caller's login, or from an authenticated_id. It
1144 applies appropriate quoting rules for a local part.
1146 Argument: the local part
1147 Returns: the local part, quoted if necessary
1151 local_part_quote(uschar *lpart)
1153 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;
1165 g = string_catn(NULL, US"\"", 1);
1169 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1172 g = string_cat(g, lpart);
1175 g = string_catn(g, lpart, nq - lpart);
1176 g = string_catn(g, US"\\", 1);
1177 g = string_catn(g, nq, 1);
1181 g = string_catn(g, US"\"", 1);
1182 return string_from_gstring(g);
1188 /*************************************************
1189 * Load readline() functions *
1190 *************************************************/
1192 /* This function is called from testing executions that read data from stdin,
1193 but only when running as the calling user. Currently, only -be does this. The
1194 function loads the readline() function library and passes back the functions.
1195 On some systems, it needs the curses library, so load that too, but try without
1196 it if loading fails. All this functionality has to be requested at build time.
1199 fn_readline_ptr pointer to where to put the readline pointer
1200 fn_addhist_ptr pointer to where to put the addhistory function
1202 Returns: the dlopen handle or NULL on failure
1206 set_readline(char * (**fn_readline_ptr)(const char *),
1207 void (**fn_addhist_ptr)(const char *))
1210 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1212 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1213 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1215 if (dlhandle != NULL)
1217 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1218 * char * readline (const char *prompt);
1219 * void add_history (const char *string);
1221 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1222 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1226 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1235 /*************************************************
1236 * Get a line from stdin for testing things *
1237 *************************************************/
1239 /* This function is called when running tests that can take a number of lines
1240 of input (for example, -be and -bt). It handles continuations and trailing
1241 spaces. And prompting and a blank line output on eof. If readline() is in use,
1242 the arguments are non-NULL and provide the relevant functions.
1245 fn_readline readline function or NULL
1246 fn_addhist addhist function or NULL
1248 Returns: pointer to dynamic memory, or NULL at end of file
1252 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1257 if (!fn_readline) { printf("> "); fflush(stdout); }
1261 uschar buffer[1024];
1265 char *readline_line = NULL;
1266 if (fn_readline != NULL)
1268 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1269 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1270 p = US readline_line;
1275 /* readline() not in use */
1278 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1282 /* Handle the line */
1284 ss = p + (int)Ustrlen(p);
1285 while (ss > p && isspace(ss[-1])) ss--;
1289 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1292 g = string_catn(g, p, ss - p);
1295 if (fn_readline) free(readline_line);
1298 /* g can only be NULL if ss==p */
1299 if (ss == p || g->s[g->ptr-1] != '\\')
1303 (void) string_from_gstring(g);
1306 if (!g) printf("\n");
1307 return string_from_gstring(g);
1312 /*************************************************
1313 * Output usage information for the program *
1314 *************************************************/
1316 /* This function is called when there are no recipients
1317 or a specific --help argument was added.
1320 progname information on what name we were called by
1322 Returns: DOES NOT RETURN
1326 exim_usage(uschar *progname)
1329 /* Handle specific program invocation variants */
1330 if (Ustrcmp(progname, US"-mailq") == 0)
1333 "mailq - list the contents of the mail queue\n\n"
1334 "For a list of options, see the Exim documentation.\n");
1338 /* Generic usage - we output this whatever happens */
1340 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1341 "not directly from a shell command line. Options and/or arguments control\n"
1342 "what it does when called. For a list of options, see the Exim documentation.\n");
1349 /*************************************************
1350 * Validate that the macros given are okay *
1351 *************************************************/
1353 /* Typically, Exim will drop privileges if macros are supplied. In some
1354 cases, we want to not do so.
1356 Arguments: opt_D_used - true if the commandline had a "-D" option
1357 Returns: true if trusted, false otherwise
1361 macros_trusted(BOOL opt_D_used)
1363 #ifdef WHITELIST_D_MACROS
1365 uschar *whitelisted, *end, *p, **whites, **w;
1366 int white_count, i, n;
1368 BOOL prev_char_item, found;
1373 #ifndef WHITELIST_D_MACROS
1377 /* We only trust -D overrides for some invoking users:
1378 root, the exim run-time user, the optional config owner user.
1379 I don't know why config-owner would be needed, but since they can own the
1380 config files anyway, there's no security risk to letting them override -D. */
1381 if ( ! ((real_uid == root_uid)
1382 || (real_uid == exim_uid)
1383 #ifdef CONFIGURE_OWNER
1384 || (real_uid == config_uid)
1388 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1392 /* Get a list of macros which are whitelisted */
1393 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1394 prev_char_item = FALSE;
1396 for (p = whitelisted; *p != '\0'; ++p)
1398 if (*p == ':' || isspace(*p))
1403 prev_char_item = FALSE;
1406 if (!prev_char_item)
1407 prev_char_item = TRUE;
1414 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1415 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1420 if (i == white_count)
1422 while (*p != '\0' && p < end)
1428 /* The list of commandline macros should be very short.
1429 Accept the N*M complexity. */
1430 for (m = macros; m; m = m->next) if (m->command_line)
1433 for (w = whites; *w; ++w)
1434 if (Ustrcmp(*w, m->name) == 0)
1441 if (!m->replacement)
1443 if ((len = m->replen) == 0)
1445 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1446 0, PCRE_EOPT, NULL, 0);
1449 if (n != PCRE_ERROR_NOMATCH)
1450 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1454 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1460 /*************************************************
1461 * Expansion testing *
1462 *************************************************/
1464 /* Expand and print one item, doing macro-processing.
1467 item line for expansion
1471 expansion_test_line(uschar * line)
1476 Ustrncpy(big_buffer, line, big_buffer_size);
1477 big_buffer[big_buffer_size-1] = '\0';
1478 len = Ustrlen(big_buffer);
1480 (void) macros_expand(0, &len, &dummy_macexp);
1482 if (isupper(big_buffer[0]))
1484 if (macro_read_assignment(big_buffer))
1485 printf("Defined macro '%s'\n", mlast->name);
1488 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1489 else printf("Failed: %s\n", expand_string_message);
1493 /*************************************************
1494 * Entry point and high-level code *
1495 *************************************************/
1497 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1498 the appropriate action. All the necessary functions are present in the one
1499 binary. I originally thought one should split it up, but it turns out that so
1500 much of the apparatus is needed in each chunk that one might as well just have
1501 it all available all the time, which then makes the coding easier as well.
1504 argc count of entries in argv
1505 argv argument strings, with argv[0] being the program name
1507 Returns: EXIT_SUCCESS if terminated successfully
1508 EXIT_FAILURE otherwise, except when a message has been sent
1509 to the sender, and -oee was given
1513 main(int argc, char **cargv)
1515 uschar **argv = USS cargv;
1516 int arg_receive_timeout = -1;
1517 int arg_smtp_receive_timeout = -1;
1518 int arg_error_handling = error_handling;
1519 int filter_sfd = -1;
1520 int filter_ufd = -1;
1523 int list_queue_option = 0;
1525 int msg_action_arg = -1;
1526 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1527 int queue_only_reason = 0;
1529 int perl_start_option = 0;
1531 int recipients_arg = argc;
1532 int sender_address_domain = 0;
1533 int test_retry_arg = -1;
1534 int test_rewrite_arg = -1;
1535 BOOL arg_queue_only = FALSE;
1536 BOOL bi_option = FALSE;
1537 BOOL checking = FALSE;
1538 BOOL count_queue = FALSE;
1539 BOOL expansion_test = FALSE;
1540 BOOL extract_recipients = FALSE;
1541 BOOL flag_G = FALSE;
1542 BOOL flag_n = FALSE;
1543 BOOL forced_delivery = FALSE;
1544 BOOL f_end_dot = FALSE;
1545 BOOL deliver_give_up = FALSE;
1546 BOOL list_queue = FALSE;
1547 BOOL list_options = FALSE;
1548 BOOL list_config = FALSE;
1549 BOOL local_queue_only;
1551 BOOL one_msg_action = FALSE;
1552 BOOL opt_D_used = FALSE;
1553 BOOL queue_only_set = FALSE;
1554 BOOL receiving_message = TRUE;
1555 BOOL sender_ident_set = FALSE;
1556 BOOL session_local_queue_only;
1558 BOOL removed_privilege = FALSE;
1559 BOOL usage_wanted = FALSE;
1560 BOOL verify_address_mode = FALSE;
1561 BOOL verify_as_sender = FALSE;
1562 BOOL version_printed = FALSE;
1563 uschar *alias_arg = NULL;
1564 uschar *called_as = US"";
1565 uschar *cmdline_syslog_name = NULL;
1566 uschar *start_queue_run_id = NULL;
1567 uschar *stop_queue_run_id = NULL;
1568 uschar *expansion_test_message = NULL;
1569 uschar *ftest_domain = NULL;
1570 uschar *ftest_localpart = NULL;
1571 uschar *ftest_prefix = NULL;
1572 uschar *ftest_suffix = NULL;
1573 uschar *log_oneline = NULL;
1574 uschar *malware_test_file = NULL;
1575 uschar *real_sender_address;
1576 uschar *originator_home = US"/";
1581 struct stat statbuf;
1582 pid_t passed_qr_pid = (pid_t)0;
1583 int passed_qr_pipe = -1;
1584 gid_t group_list[NGROUPS_MAX];
1586 /* For the -bI: flag */
1587 enum commandline_info info_flag = CMDINFO_NONE;
1588 BOOL info_stdout = FALSE;
1590 /* Possible options for -R and -S */
1592 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1594 /* Need to define this in case we need to change the environment in order
1595 to get rid of a bogus time zone. We have to make it char rather than uschar
1596 because some OS define it in /usr/include/unistd.h. */
1598 extern char **environ;
1600 /* If the Exim user and/or group and/or the configuration file owner/group were
1601 defined by ref:name at build time, we must now find the actual uid/gid values.
1602 This is a feature to make the lives of binary distributors easier. */
1604 #ifdef EXIM_USERNAME
1605 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1609 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1613 /* If ref:name uses a number as the name, route_finduser() returns
1614 TRUE with exim_uid set and pw coerced to NULL. */
1616 exim_gid = pw->pw_gid;
1617 #ifndef EXIM_GROUPNAME
1621 "exim: ref:name should specify a usercode, not a group.\n"
1622 "exim: can't let you get away with it unless you also specify a group.\n");
1629 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1635 #ifdef EXIM_GROUPNAME
1636 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1638 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1644 #ifdef CONFIGURE_OWNERNAME
1645 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1647 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1648 CONFIGURE_OWNERNAME);
1653 /* We default the system_filter_user to be the Exim run-time user, as a
1654 sane non-root value. */
1655 system_filter_uid = exim_uid;
1657 #ifdef CONFIGURE_GROUPNAME
1658 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1660 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1661 CONFIGURE_GROUPNAME);
1666 /* In the Cygwin environment, some initialization used to need doing.
1667 It was fudged in by means of this macro; now no longer but we'll leave
1668 it in case of others. */
1674 /* Check a field which is patched when we are running Exim within its
1675 testing harness; do a fast initial check, and then the whole thing. */
1677 running_in_test_harness =
1678 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1680 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1681 at the start of a program; however, it seems that some environments do not
1682 follow this. A "strange" locale can affect the formatting of timestamps, so we
1685 setlocale(LC_ALL, "C");
1687 /* Set up the default handler for timing using alarm(). */
1689 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1691 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1692 because store_malloc writes a log entry on failure. */
1694 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1696 fprintf(stderr, "exim: failed to get store for log buffer\n");
1700 /* Initialize the default log options. */
1702 bits_set(log_selector, log_selector_size, log_default);
1704 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1705 NULL when the daemon is run and the file is closed. We have to use this
1706 indirection, because some systems don't allow writing to the variable "stderr".
1709 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1711 /* Arrange for the PCRE regex library to use our store functions. Note that
1712 the normal calls are actually macros that add additional arguments for
1713 debugging purposes so we have to assign specially constructed functions here.
1714 The default is to use store in the stacking pool, but this is overridden in the
1715 regex_must_compile() function. */
1717 pcre_malloc = function_store_get;
1718 pcre_free = function_dummy_free;
1720 /* Ensure there is a big buffer for temporary use in several places. It is put
1721 in malloc store so that it can be freed for enlargement if necessary. */
1723 big_buffer = store_malloc(big_buffer_size);
1725 /* Set up the handler for the data request signal, and set the initial
1726 descriptive text. */
1728 set_process_info("initializing");
1729 os_restarting_signal(SIGUSR1, usr1_handler);
1731 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1732 in the daemon code. For the rest of Exim's uses, we ignore it. */
1734 signal(SIGHUP, SIG_IGN);
1736 /* We don't want to die on pipe errors as the code is written to handle
1737 the write error instead. */
1739 signal(SIGPIPE, SIG_IGN);
1741 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1742 set to SIG_IGN. This causes subprocesses that complete before the parent
1743 process waits for them not to hang around, so when Exim calls wait(), nothing
1744 is there. The wait() code has been made robust against this, but let's ensure
1745 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1746 ending status. We use sigaction rather than plain signal() on those OS where
1747 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1748 problem on AIX with this.) */
1752 struct sigaction act;
1753 act.sa_handler = SIG_DFL;
1754 sigemptyset(&(act.sa_mask));
1756 sigaction(SIGCHLD, &act, NULL);
1759 signal(SIGCHLD, SIG_DFL);
1762 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1767 /* Set up the version number. Set up the leading 'E' for the external form of
1768 message ids, set the pointer to the internal form, and initialize it to
1769 indicate no message being processed. */
1772 message_id_option[0] = '-';
1773 message_id_external = message_id_option + 1;
1774 message_id_external[0] = 'E';
1775 message_id = message_id_external + 1;
1778 /* Set the umask to zero so that any files Exim creates using open() are
1779 created with the modes that it specifies. NOTE: Files created with fopen() have
1780 a problem, which was not recognized till rather late (February 2006). With this
1781 umask, such files will be world writeable. (They are all content scanning files
1782 in the spool directory, which isn't world-accessible, so this is not a
1783 disaster, but it's untidy.) I don't want to change this overall setting,
1784 however, because it will interact badly with the open() calls. Instead, there's
1785 now a function called modefopen() that fiddles with the umask while calling
1790 /* Precompile the regular expression for matching a message id. Keep this in
1791 step with the code that generates ids in the accept.c module. We need to do
1792 this here, because the -M options check their arguments for syntactic validity
1793 using mac_ismsgid, which uses this. */
1796 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1798 /* Precompile the regular expression that is used for matching an SMTP error
1799 code, possibly extended, at the start of an error message. Note that the
1800 terminating whitespace character is included. */
1803 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1806 #ifdef WHITELIST_D_MACROS
1807 /* Precompile the regular expression used to filter the content of macros
1808 given to -D for permissibility. */
1810 regex_whitelisted_macro =
1811 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1814 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1816 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1817 this seems to be a generally accepted convention, since one finds symbolic
1818 links called "mailq" in standard OS configurations. */
1820 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1821 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1824 receiving_message = FALSE;
1825 called_as = US"-mailq";
1828 /* If the program is called as "rmail" treat it as equivalent to
1829 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1830 i.e. preventing a single dot on a line from terminating the message, and
1831 returning with zero return code, even in cases of error (provided an error
1832 message has been sent). */
1834 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1835 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1838 called_as = US"-rmail";
1839 errors_sender_rc = EXIT_SUCCESS;
1842 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1843 this is a smail convention. */
1845 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1846 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1848 smtp_input = smtp_batched_input = TRUE;
1849 called_as = US"-rsmtp";
1852 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1853 this is a smail convention. */
1855 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1856 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1859 receiving_message = FALSE;
1860 called_as = US"-runq";
1863 /* If the program is called as "newaliases" treat it as equivalent to
1864 "exim -bi"; this is a sendmail convention. */
1866 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1867 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1870 receiving_message = FALSE;
1871 called_as = US"-newaliases";
1874 /* Save the original effective uid for a couple of uses later. It should
1875 normally be root, but in some esoteric environments it may not be. */
1877 original_euid = geteuid();
1879 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1880 to be the same as the real ones. This makes a difference only if Exim is setuid
1881 (or setgid) to something other than root, which could be the case in some
1882 special configurations. */
1884 real_uid = getuid();
1885 real_gid = getgid();
1887 if (real_uid == root_uid)
1889 rv = setgid(real_gid);
1892 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1893 (long int)real_gid, strerror(errno));
1896 rv = setuid(real_uid);
1899 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1900 (long int)real_uid, strerror(errno));
1905 /* If neither the original real uid nor the original euid was root, Exim is
1906 running in an unprivileged state. */
1908 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1910 /* Scan the program's arguments. Some can be dealt with right away; others are
1911 simply recorded for checking and handling afterwards. Do a high-level switch
1912 on the second character (the one after '-'), to save some effort. */
1914 for (i = 1; i < argc; i++)
1916 BOOL badarg = FALSE;
1917 uschar *arg = argv[i];
1921 /* An argument not starting with '-' is the start of a recipients list;
1922 break out of the options-scanning loop. */
1930 /* An option consisting of -- terminates the options */
1932 if (Ustrcmp(arg, "--") == 0)
1934 recipients_arg = i + 1;
1938 /* Handle flagged options */
1940 switchchar = arg[1];
1943 /* Make all -ex options synonymous with -oex arguments, since that
1944 is assumed by various callers. Also make -qR options synonymous with -R
1945 options, as that seems to be required as well. Allow for -qqR too, and
1946 the same for -S options. */
1948 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1949 Ustrncmp(arg+1, "qR", 2) == 0 ||
1950 Ustrncmp(arg+1, "qS", 2) == 0)
1952 switchchar = arg[2];
1955 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1957 switchchar = arg[3];
1959 queue_2stage = TRUE;
1962 /* Make -r synonymous with -f, since it is a documented alias */
1964 else if (arg[1] == 'r') switchchar = 'f';
1966 /* Make -ov synonymous with -v */
1968 else if (Ustrcmp(arg, "-ov") == 0)
1974 /* deal with --option_aliases */
1975 else if (switchchar == '-')
1977 if (Ustrcmp(argrest, "help") == 0)
1979 usage_wanted = TRUE;
1982 else if (Ustrcmp(argrest, "version") == 0)
1989 /* High-level switch on active initial letter */
1994 /* sendmail uses -Ac and -Am to control which .cf file is used;
1997 if (*argrest == '\0') { badarg = TRUE; break; }
2000 BOOL ignore = FALSE;
2005 if (*(argrest + 1) == '\0')
2009 if (!ignore) { badarg = TRUE; break; }
2013 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2014 so has no need of it. */
2017 if (*argrest == 0) i++; /* Skip over the type */
2022 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2024 /* -bd: Run in daemon mode, awaiting SMTP connections.
2025 -bdf: Ditto, but in the foreground.
2028 if (*argrest == 'd')
2030 daemon_listen = TRUE;
2031 if (*(++argrest) == 'f') background_daemon = FALSE;
2032 else if (*argrest != 0) { badarg = TRUE; break; }
2035 /* -be: Run in expansion test mode
2036 -bem: Ditto, but read a message from a file first
2039 else if (*argrest == 'e')
2041 expansion_test = checking = TRUE;
2042 if (argrest[1] == 'm')
2044 if (++i >= argc) { badarg = TRUE; break; }
2045 expansion_test_message = argv[i];
2048 if (argrest[1] != 0) { badarg = TRUE; break; }
2051 /* -bF: Run system filter test */
2053 else if (*argrest == 'F')
2055 filter_test |= checking = FTEST_SYSTEM;
2056 if (*(++argrest) != 0) { badarg = TRUE; break; }
2057 if (++i < argc) filter_test_sfile = argv[i]; else
2059 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2064 /* -bf: Run user filter test
2065 -bfd: Set domain for filter testing
2066 -bfl: Set local part for filter testing
2067 -bfp: Set prefix for filter testing
2068 -bfs: Set suffix for filter testing
2071 else if (*argrest == 'f')
2073 if (*(++argrest) == 0)
2075 filter_test |= checking = FTEST_USER;
2076 if (++i < argc) filter_test_ufile = argv[i]; else
2078 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2086 fprintf(stderr, "exim: string expected after %s\n", arg);
2089 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2090 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2091 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2092 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2093 else { badarg = TRUE; break; }
2097 /* -bh: Host checking - an IP address must follow. */
2099 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2101 if (++i >= argc) { badarg = TRUE; break; }
2102 sender_host_address = argv[i];
2103 host_checking = checking = log_testing_mode = TRUE;
2104 host_checking_callout = argrest[1] == 'c';
2105 message_logs = FALSE;
2108 /* -bi: This option is used by sendmail to initialize *the* alias file,
2109 though it has the -oA option to specify a different file. Exim has no
2110 concept of *the* alias file, but since Sun's YP make script calls
2111 sendmail this way, some support must be provided. */
2113 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2115 /* -bI: provide information, of the type to follow after a colon.
2116 This is an Exim flag. */
2118 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2120 uschar *p = &argrest[2];
2121 info_flag = CMDINFO_HELP;
2124 if (strcmpic(p, CUS"sieve") == 0)
2126 info_flag = CMDINFO_SIEVE;
2129 else if (strcmpic(p, CUS"dscp") == 0)
2131 info_flag = CMDINFO_DSCP;
2134 else if (strcmpic(p, CUS"help") == 0)
2141 /* -bm: Accept and deliver message - the default option. Reinstate
2142 receiving_message, which got turned off for all -b options. */
2144 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2146 /* -bmalware: test the filename given for malware */
2148 else if (Ustrcmp(argrest, "malware") == 0)
2150 if (++i >= argc) { badarg = TRUE; break; }
2152 malware_test_file = argv[i];
2155 /* -bnq: For locally originating messages, do not qualify unqualified
2156 addresses. In the envelope, this causes errors; in header lines they
2159 else if (Ustrcmp(argrest, "nq") == 0)
2161 allow_unqualified_sender = FALSE;
2162 allow_unqualified_recipient = FALSE;
2165 /* -bpxx: List the contents of the mail queue, in various forms. If
2166 the option is -bpc, just a queue count is needed. Otherwise, if the
2167 first letter after p is r, then order is random. */
2169 else if (*argrest == 'p')
2171 if (*(++argrest) == 'c')
2174 if (*(++argrest) != 0) badarg = TRUE;
2178 if (*argrest == 'r')
2180 list_queue_option = 8;
2183 else list_queue_option = 0;
2187 /* -bp: List the contents of the mail queue, top-level only */
2189 if (*argrest == 0) {}
2191 /* -bpu: List the contents of the mail queue, top-level undelivered */
2193 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2195 /* -bpa: List the contents of the mail queue, including all delivered */
2197 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2199 /* Unknown after -bp[r] */
2209 /* -bP: List the configuration variables given as the address list.
2210 Force -v, so configuration errors get displayed. */
2212 else if (Ustrcmp(argrest, "P") == 0)
2214 /* -bP config: we need to setup here, because later,
2215 * when list_options is checked, the config is read already */
2216 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2219 readconf_save_config(version_string);
2223 list_options = TRUE;
2224 debug_selector |= D_v;
2225 debug_file = stderr;
2229 /* -brt: Test retry configuration lookup */
2231 else if (Ustrcmp(argrest, "rt") == 0)
2234 test_retry_arg = i + 1;
2238 /* -brw: Test rewrite configuration */
2240 else if (Ustrcmp(argrest, "rw") == 0)
2243 test_rewrite_arg = i + 1;
2247 /* -bS: Read SMTP commands on standard input, but produce no replies -
2248 all errors are reported by sending messages. */
2250 else if (Ustrcmp(argrest, "S") == 0)
2251 smtp_input = smtp_batched_input = receiving_message = TRUE;
2253 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2254 on standard output. */
2256 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2258 /* -bt: address testing mode */
2260 else if (Ustrcmp(argrest, "t") == 0)
2261 address_test_mode = checking = log_testing_mode = TRUE;
2263 /* -bv: verify addresses */
2265 else if (Ustrcmp(argrest, "v") == 0)
2266 verify_address_mode = checking = log_testing_mode = TRUE;
2268 /* -bvs: verify sender addresses */
2270 else if (Ustrcmp(argrest, "vs") == 0)
2272 verify_address_mode = checking = log_testing_mode = TRUE;
2273 verify_as_sender = TRUE;
2276 /* -bV: Print version string and support details */
2278 else if (Ustrcmp(argrest, "V") == 0)
2280 printf("Exim version %s #%s built %s\n", version_string,
2281 version_cnumber, version_date);
2282 printf("%s\n", CS version_copyright);
2283 version_printed = TRUE;
2284 show_whats_supported(stdout);
2285 log_testing_mode = TRUE;
2288 /* -bw: inetd wait mode, accept a listening socket as stdin */
2290 else if (*argrest == 'w')
2292 inetd_wait_mode = TRUE;
2293 background_daemon = FALSE;
2294 daemon_listen = TRUE;
2295 if (*(++argrest) != '\0')
2297 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2298 if (inetd_wait_timeout <= 0)
2300 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2310 /* -C: change configuration file list; ignore if it isn't really
2311 a change! Enforce a prefix check if required. */
2316 if(++i < argc) argrest = argv[i]; else
2317 { badarg = TRUE; break; }
2319 if (Ustrcmp(config_main_filelist, argrest) != 0)
2321 #ifdef ALT_CONFIG_PREFIX
2323 int len = Ustrlen(ALT_CONFIG_PREFIX);
2324 const uschar *list = argrest;
2326 while((filename = string_nextinlist(&list, &sep, big_buffer,
2327 big_buffer_size)) != NULL)
2329 if ((Ustrlen(filename) < len ||
2330 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2331 Ustrstr(filename, "/../") != NULL) &&
2332 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2334 fprintf(stderr, "-C Permission denied\n");
2339 if (real_uid != root_uid)
2341 #ifdef TRUSTED_CONFIG_LIST
2343 if (real_uid != exim_uid
2344 #ifdef CONFIGURE_OWNER
2345 && real_uid != config_uid
2348 trusted_config = FALSE;
2351 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2354 struct stat statbuf;
2356 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2357 (statbuf.st_uid != root_uid /* owner not root */
2358 #ifdef CONFIGURE_OWNER
2359 && statbuf.st_uid != config_uid /* owner not the special one */
2362 (statbuf.st_gid != root_gid /* group not root */
2363 #ifdef CONFIGURE_GROUP
2364 && statbuf.st_gid != config_gid /* group not the special one */
2366 && (statbuf.st_mode & 020) != 0 /* group writeable */
2368 (statbuf.st_mode & 2) != 0) /* world writeable */
2370 trusted_config = FALSE;
2375 /* Well, the trust list at least is up to scratch... */
2376 void *reset_point = store_get(0);
2377 uschar *trusted_configs[32];
2381 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2383 uschar *start = big_buffer, *nl;
2384 while (*start && isspace(*start))
2388 nl = Ustrchr(start, '\n');
2391 trusted_configs[nr_configs++] = string_copy(start);
2392 if (nr_configs == 32)
2400 const uschar *list = argrest;
2402 while (trusted_config && (filename = string_nextinlist(&list,
2403 &sep, big_buffer, big_buffer_size)) != NULL)
2405 for (i=0; i < nr_configs; i++)
2407 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2410 if (i == nr_configs)
2412 trusted_config = FALSE;
2416 store_reset(reset_point);
2420 /* No valid prefixes found in trust_list file. */
2421 trusted_config = FALSE;
2427 /* Could not open trust_list file. */
2428 trusted_config = FALSE;
2432 /* Not root; don't trust config */
2433 trusted_config = FALSE;
2437 config_main_filelist = argrest;
2438 config_changed = TRUE;
2443 /* -D: set up a macro definition */
2446 #ifdef DISABLE_D_OPTION
2447 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2454 uschar *s = argrest;
2457 while (isspace(*s)) s++;
2459 if (*s < 'A' || *s > 'Z')
2461 fprintf(stderr, "exim: macro name set by -D must start with "
2462 "an upper case letter\n");
2466 while (isalnum(*s) || *s == '_')
2468 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2472 if (ptr == 0) { badarg = TRUE; break; }
2473 while (isspace(*s)) s++;
2476 if (*s++ != '=') { badarg = TRUE; break; }
2477 while (isspace(*s)) s++;
2480 for (m = macros; m; m = m->next)
2481 if (Ustrcmp(m->name, name) == 0)
2483 fprintf(stderr, "exim: duplicated -D in command line\n");
2487 m = macro_create(string_copy(name), string_copy(s), TRUE);
2489 if (clmacro_count >= MAX_CLMACROS)
2491 fprintf(stderr, "exim: too many -D options on command line\n");
2494 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2500 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2501 The latter is now a no-op, retained for compatibility only. If -dd is used,
2502 debugging subprocesses of the daemon is disabled. */
2505 if (Ustrcmp(argrest, "ropcr") == 0)
2507 /* drop_cr = TRUE; */
2510 /* Use an intermediate variable so that we don't set debugging while
2511 decoding the debugging bits. */
2515 unsigned int selector = D_default;
2518 if (*argrest == 'd')
2520 debug_daemon = TRUE;
2524 decode_bits(&selector, 1, debug_notall, argrest,
2525 debug_options, debug_options_count, US"debug", 0);
2526 debug_selector = selector;
2531 /* -E: This is a local error message. This option is not intended for
2532 external use at all, but is not restricted to trusted callers because it
2533 does no harm (just suppresses certain error messages) and if Exim is run
2534 not setuid root it won't always be trusted when it generates error
2535 messages using this option. If there is a message id following -E, point
2536 message_reference at it, for logging. */
2539 local_error_message = TRUE;
2540 if (mac_ismsgid(argrest)) message_reference = argrest;
2544 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2545 option, so it looks as if historically the -oex options are also callable
2546 without the leading -o. So we have to accept them. Before the switch,
2547 anything starting -oe has been converted to -e. Exim does not support all
2548 of the sendmail error options. */
2551 if (Ustrcmp(argrest, "e") == 0)
2553 arg_error_handling = ERRORS_SENDER;
2554 errors_sender_rc = EXIT_SUCCESS;
2556 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2557 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2558 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2559 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2564 /* -F: Set sender's full name, used instead of the gecos entry from
2565 the password file. Since users can usually alter their gecos entries,
2566 there's no security involved in using this instead. The data can follow
2567 the -F or be in the next argument. */
2572 if(++i < argc) argrest = argv[i]; else
2573 { badarg = TRUE; break; }
2575 originator_name = argrest;
2576 sender_name_forced = TRUE;
2580 /* -f: Set sender's address - this value is only actually used if Exim is
2581 run by a trusted user, or if untrusted_set_sender is set and matches the
2582 address, except that the null address can always be set by any user. The
2583 test for this happens later, when the value given here is ignored when not
2584 permitted. For an untrusted user, the actual sender is still put in Sender:
2585 if it doesn't match the From: header (unless no_local_from_check is set).
2586 The data can follow the -f or be in the next argument. The -r switch is an
2587 obsolete form of -f but since there appear to be programs out there that
2588 use anything that sendmail has ever supported, better accept it - the
2589 synonymizing is done before the switch above.
2591 At this stage, we must allow domain literal addresses, because we don't
2592 know what the setting of allow_domain_literals is yet. Ditto for trailing
2593 dots and strip_trailing_dot. */
2597 int dummy_start, dummy_end;
2601 if (i+1 < argc) argrest = argv[++i]; else
2602 { badarg = TRUE; break; }
2605 sender_address = string_sprintf(""); /* Ensure writeable memory */
2608 uschar *temp = argrest + Ustrlen(argrest) - 1;
2609 while (temp >= argrest && isspace(*temp)) temp--;
2610 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2611 allow_domain_literals = TRUE;
2612 strip_trailing_dot = TRUE;
2614 allow_utf8_domains = TRUE;
2616 sender_address = parse_extract_address(argrest, &errmess,
2617 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2619 message_smtputf8 = string_is_utf8(sender_address);
2620 allow_utf8_domains = FALSE;
2622 allow_domain_literals = FALSE;
2623 strip_trailing_dot = FALSE;
2624 if (sender_address == NULL)
2626 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2627 return EXIT_FAILURE;
2630 sender_address_forced = TRUE;
2634 /* -G: sendmail invocation to specify that it's a gateway submission and
2635 sendmail may complain about problems instead of fixing them.
2636 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2637 not at this time complain about problems. */
2643 /* -h: Set the hop count for an incoming message. Exim does not currently
2644 support this; it always computes it by counting the Received: headers.
2645 To put it in will require a change to the spool header file format. */
2650 if(++i < argc) argrest = argv[i]; else
2651 { badarg = TRUE; break; }
2653 if (!isdigit(*argrest)) badarg = TRUE;
2657 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2658 not to be documented for sendmail but mailx (at least) uses it) */
2661 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2665 /* -L: set the identifier used for syslog; equivalent to setting
2666 syslog_processname in the config file, but needs to be an admin option. */
2669 if (*argrest == '\0')
2671 if(++i < argc) argrest = argv[i]; else
2672 { badarg = TRUE; break; }
2674 sz = Ustrlen(argrest);
2677 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2678 return EXIT_FAILURE;
2682 fprintf(stderr, "exim: the -L syslog name is too short\n");
2683 return EXIT_FAILURE;
2685 cmdline_syslog_name = argrest;
2689 receiving_message = FALSE;
2691 /* -MC: continue delivery of another message via an existing open
2692 file descriptor. This option is used for an internal call by the
2693 smtp transport when there is a pending message waiting to go to an
2694 address to which it has got a connection. Five subsequent arguments are
2695 required: transport name, host name, IP address, sequence number, and
2696 message_id. Transports may decline to create new processes if the sequence
2697 number gets too big. The channel is stdin. This (-MC) must be the last
2698 argument. There's a subsequent check that the real-uid is privileged.
2700 If we are running in the test harness. delay for a bit, to let the process
2701 that set this one up complete. This makes for repeatability of the logging,
2704 if (Ustrcmp(argrest, "C") == 0)
2706 union sockaddr_46 interface_sock;
2707 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2711 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2712 return EXIT_FAILURE;
2715 if (msg_action_arg >= 0)
2717 fprintf(stderr, "exim: incompatible arguments\n");
2718 return EXIT_FAILURE;
2721 continue_transport = argv[++i];
2722 continue_hostname = argv[++i];
2723 continue_host_address = argv[++i];
2724 continue_sequence = Uatoi(argv[++i]);
2725 msg_action = MSG_DELIVER;
2726 msg_action_arg = ++i;
2727 forced_delivery = TRUE;
2728 queue_run_pid = passed_qr_pid;
2729 queue_run_pipe = passed_qr_pipe;
2731 if (!mac_ismsgid(argv[i]))
2733 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2735 return EXIT_FAILURE;
2738 /* Set up $sending_ip_address and $sending_port, unless proxied */
2740 if (!continue_proxy_cipher)
2741 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2743 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2747 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2749 return EXIT_FAILURE;
2752 if (running_in_test_harness) millisleep(500);
2756 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2760 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2761 precedes -MC (see above). The flag indicates that the host to which
2762 Exim is connected has accepted an AUTH sequence. */
2764 case 'A': smtp_authenticated = TRUE; break;
2766 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2767 that exim is connected to supports the esmtp extension DSN */
2769 case 'D': smtp_peer_options |= OPTION_DSN; break;
2771 /* -MCG: set the queue name, to a non-default value */
2773 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2777 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2779 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2781 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2782 it preceded -MC (see above) */
2784 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2786 /* -MCQ: pass on the pid of the queue-running process that started
2787 this chain of deliveries and the fd of its synchronizing pipe; this
2788 is useful only when it precedes -MC (see above) */
2790 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2792 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2796 /* -MCS: set the smtp_use_size flag; this is useful only when it
2797 precedes -MC (see above) */
2799 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2802 /* -MCt: similar to -MCT below but the connection is still open
2803 via a proxy proces which handles the TLS context and coding.
2804 Require three arguments for the proxied local address and port,
2805 and the TLS cipher. */
2807 case 't': if (++i < argc) sending_ip_address = argv[i];
2809 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2811 if (++i < argc) continue_proxy_cipher = argv[i];
2815 /* -MCT: set the tls_offered flag; this is useful only when it
2816 precedes -MC (see above). The flag indicates that the host to which
2817 Exim is connected has offered TLS support. */
2819 case 'T': smtp_peer_options |= OPTION_TLS; break;
2822 default: badarg = TRUE; break;
2827 /* -M[x]: various operations on the following list of message ids:
2828 -M deliver the messages, ignoring next retry times and thawing
2829 -Mc deliver the messages, checking next retry times, no thawing
2830 -Mf freeze the messages
2831 -Mg give up on the messages
2832 -Mt thaw the messages
2833 -Mrm remove the messages
2834 In the above cases, this must be the last option. There are also the
2835 following options which are followed by a single message id, and which
2836 act on that message. Some of them use the "recipient" addresses as well.
2837 -Mar add recipient(s)
2838 -Mmad mark all recipients delivered
2839 -Mmd mark recipients(s) delivered
2841 -Mset load a message for use with -be
2843 -Mvc show copy (of whole message, in RFC 2822 format)
2848 else if (*argrest == 0)
2850 msg_action = MSG_DELIVER;
2851 forced_delivery = deliver_force_thaw = TRUE;
2853 else if (Ustrcmp(argrest, "ar") == 0)
2855 msg_action = MSG_ADD_RECIPIENT;
2856 one_msg_action = TRUE;
2858 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2859 else if (Ustrcmp(argrest, "es") == 0)
2861 msg_action = MSG_EDIT_SENDER;
2862 one_msg_action = TRUE;
2864 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2865 else if (Ustrcmp(argrest, "g") == 0)
2867 msg_action = MSG_DELIVER;
2868 deliver_give_up = TRUE;
2870 else if (Ustrcmp(argrest, "mad") == 0)
2872 msg_action = MSG_MARK_ALL_DELIVERED;
2874 else if (Ustrcmp(argrest, "md") == 0)
2876 msg_action = MSG_MARK_DELIVERED;
2877 one_msg_action = TRUE;
2879 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2880 else if (Ustrcmp(argrest, "set") == 0)
2882 msg_action = MSG_LOAD;
2883 one_msg_action = TRUE;
2885 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2886 else if (Ustrcmp(argrest, "vb") == 0)
2888 msg_action = MSG_SHOW_BODY;
2889 one_msg_action = TRUE;
2891 else if (Ustrcmp(argrest, "vc") == 0)
2893 msg_action = MSG_SHOW_COPY;
2894 one_msg_action = TRUE;
2896 else if (Ustrcmp(argrest, "vh") == 0)
2898 msg_action = MSG_SHOW_HEADER;
2899 one_msg_action = TRUE;
2901 else if (Ustrcmp(argrest, "vl") == 0)
2903 msg_action = MSG_SHOW_LOG;
2904 one_msg_action = TRUE;
2906 else { badarg = TRUE; break; }
2908 /* All the -Mxx options require at least one message id. */
2910 msg_action_arg = i + 1;
2911 if (msg_action_arg >= argc)
2913 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2914 return EXIT_FAILURE;
2917 /* Some require only message ids to follow */
2919 if (!one_msg_action)
2922 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2924 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2926 return EXIT_FAILURE;
2928 goto END_ARG; /* Remaining args are ids */
2931 /* Others require only one message id, possibly followed by addresses,
2932 which will be handled as normal arguments. */
2936 if (!mac_ismsgid(argv[msg_action_arg]))
2938 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2939 argv[msg_action_arg], arg);
2940 return EXIT_FAILURE;
2947 /* Some programs seem to call the -om option without the leading o;
2948 for sendmail it askes for "me too". Exim always does this. */
2951 if (*argrest != 0) badarg = TRUE;
2955 /* -N: don't do delivery - a debugging option that stops transports doing
2956 their thing. It implies debugging at the D_v level. */
2961 dont_deliver = TRUE;
2962 debug_selector |= D_v;
2963 debug_file = stderr;
2969 /* -n: This means "don't alias" in sendmail, apparently.
2970 For normal invocations, it has no effect.
2971 It may affect some other options. */
2977 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2978 option to the specified value. This form uses long names. We need to handle
2979 -O option=value and -Ooption=value. */
2986 fprintf(stderr, "exim: string expected after -O\n");
2994 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2997 if (*argrest == 'A')
2999 alias_arg = argrest + 1;
3000 if (alias_arg[0] == 0)
3002 if (i+1 < argc) alias_arg = argv[++i]; else
3004 fprintf(stderr, "exim: string expected after -oA\n");
3010 /* -oB: Set a connection message max value for remote deliveries */
3012 else if (*argrest == 'B')
3014 uschar *p = argrest + 1;
3017 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
3019 connection_max_messages = 1;
3028 fprintf(stderr, "exim: number expected after -oB\n");
3031 connection_max_messages = Uatoi(p);
3035 /* -odb: background delivery */
3037 else if (Ustrcmp(argrest, "db") == 0)
3039 synchronous_delivery = FALSE;
3040 arg_queue_only = FALSE;
3041 queue_only_set = TRUE;
3044 /* -odf: foreground delivery (smail-compatible option); same effect as
3045 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3048 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3050 synchronous_delivery = TRUE;
3051 arg_queue_only = FALSE;
3052 queue_only_set = TRUE;
3055 /* -odq: queue only */
3057 else if (Ustrcmp(argrest, "dq") == 0)
3059 synchronous_delivery = FALSE;
3060 arg_queue_only = TRUE;
3061 queue_only_set = TRUE;
3064 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3065 but no remote delivery */
3067 else if (Ustrcmp(argrest, "dqs") == 0)
3070 arg_queue_only = FALSE;
3071 queue_only_set = TRUE;
3074 /* -oex: Sendmail error flags. As these are also accepted without the
3075 leading -o prefix, for compatibility with vacation and other callers,
3076 they are handled with -e above. */
3078 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3079 -oitrue: Another sendmail syntax for the same */
3081 else if (Ustrcmp(argrest, "i") == 0 ||
3082 Ustrcmp(argrest, "itrue") == 0)
3085 /* -oM*: Set various characteristics for an incoming message; actually
3086 acted on for trusted callers only. */
3088 else if (*argrest == 'M')
3092 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3096 /* -oMa: Set sender host address */
3098 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3100 /* -oMaa: Set authenticator name */
3102 else if (Ustrcmp(argrest, "Maa") == 0)
3103 sender_host_authenticated = argv[++i];
3105 /* -oMas: setting authenticated sender */
3107 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3109 /* -oMai: setting authenticated id */
3111 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3113 /* -oMi: Set incoming interface address */
3115 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3117 /* -oMm: Message reference */
3119 else if (Ustrcmp(argrest, "Mm") == 0)
3121 if (!mac_ismsgid(argv[i+1]))
3123 fprintf(stderr,"-oMm must be a valid message ID\n");
3126 if (!trusted_config)
3128 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3131 message_reference = argv[++i];
3134 /* -oMr: Received protocol */
3136 else if (Ustrcmp(argrest, "Mr") == 0)
3138 if (received_protocol)
3140 fprintf(stderr, "received_protocol is set already\n");
3143 else received_protocol = argv[++i];
3145 /* -oMs: Set sender host name */
3147 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3149 /* -oMt: Set sender ident */
3151 else if (Ustrcmp(argrest, "Mt") == 0)
3153 sender_ident_set = TRUE;
3154 sender_ident = argv[++i];
3157 /* Else a bad argument */
3166 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3167 seem to call this as -m (undocumented), so that is also accepted (see
3170 else if (Ustrcmp(argrest, "m") == 0) {}
3172 /* -oo: An ancient flag for old-style addresses which still seems to
3173 crop up in some calls (see in SCO). */
3175 else if (Ustrcmp(argrest, "o") == 0) {}
3177 /* -oP <name>: set pid file path for daemon */
3179 else if (Ustrcmp(argrest, "P") == 0)
3180 override_pid_file_path = argv[++i];
3182 /* -or <n>: set timeout for non-SMTP acceptance
3183 -os <n>: set timeout for SMTP acceptance */
3185 else if (*argrest == 'r' || *argrest == 's')
3187 int *tp = (*argrest == 'r')?
3188 &arg_receive_timeout : &arg_smtp_receive_timeout;
3189 if (argrest[1] == 0)
3191 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3193 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3196 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3201 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3203 else if (Ustrcmp(argrest, "X") == 0)
3204 override_local_interfaces = argv[++i];
3206 /* Unknown -o argument */
3212 /* -ps: force Perl startup; -pd force delayed Perl startup */
3216 if (*argrest == 's' && argrest[1] == 0)
3218 perl_start_option = 1;
3221 if (*argrest == 'd' && argrest[1] == 0)
3223 perl_start_option = -1;
3228 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3229 which sets the host protocol and host name */
3233 argrest = argv[++i];
3235 { badarg = TRUE; break; }
3241 if (received_protocol)
3243 fprintf(stderr, "received_protocol is set already\n");
3247 hn = Ustrchr(argrest, ':');
3249 received_protocol = argrest;
3252 int old_pool = store_pool;
3253 store_pool = POOL_PERM;
3254 received_protocol = string_copyn(argrest, hn - argrest);
3255 store_pool = old_pool;
3256 sender_host_name = hn + 1;
3263 receiving_message = FALSE;
3264 if (queue_interval >= 0)
3266 fprintf(stderr, "exim: -q specified more than once\n");
3270 /* -qq...: Do queue runs in a 2-stage manner */
3272 if (*argrest == 'q')
3274 queue_2stage = TRUE;
3278 /* -qi...: Do only first (initial) deliveries */
3280 if (*argrest == 'i')
3282 queue_run_first_delivery = TRUE;
3286 /* -qf...: Run the queue, forcing deliveries
3287 -qff..: Ditto, forcing thawing as well */
3289 if (*argrest == 'f')
3291 queue_run_force = TRUE;
3292 if (*++argrest == 'f')
3294 deliver_force_thaw = TRUE;
3299 /* -q[f][f]l...: Run the queue only on local deliveries */
3301 if (*argrest == 'l')
3303 queue_run_local = TRUE;
3307 /* -q[f][f][l][G<name>]... Work on the named queue */
3309 if (*argrest == 'G')
3312 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3313 queue_name = string_copyn(argrest, i);
3315 if (*argrest == '/') argrest++;
3318 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3319 only, optionally named, optionally starting from a given message id. */
3321 if (*argrest == 0 &&
3322 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3325 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3326 start_queue_run_id = argv[++i];
3327 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3328 stop_queue_run_id = argv[++i];
3331 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3332 forced, optionally local only, optionally named. */
3334 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3337 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3343 case 'R': /* Synonymous with -qR... */
3344 receiving_message = FALSE;
3346 /* -Rf: As -R (below) but force all deliveries,
3347 -Rff: Ditto, but also thaw all frozen messages,
3348 -Rr: String is regex
3349 -Rrf: Regex and force
3350 -Rrff: Regex and force and thaw
3352 in all cases provided there are no further characters in this
3358 for (i = 0; i < nelem(rsopts); i++)
3359 if (Ustrcmp(argrest, rsopts[i]) == 0)
3361 if (i != 2) queue_run_force = TRUE;
3362 if (i >= 2) deliver_selectstring_regex = TRUE;
3363 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3364 argrest += Ustrlen(rsopts[i]);
3368 /* -R: Set string to match in addresses for forced queue run to
3369 pick out particular messages. */
3372 deliver_selectstring = argrest;
3373 else if (i+1 < argc)
3374 deliver_selectstring = argv[++i];
3377 fprintf(stderr, "exim: string expected after -R\n");
3383 /* -r: an obsolete synonym for -f (see above) */
3386 /* -S: Like -R but works on sender. */
3388 case 'S': /* Synonymous with -qS... */
3389 receiving_message = FALSE;
3391 /* -Sf: As -S (below) but force all deliveries,
3392 -Sff: Ditto, but also thaw all frozen messages,
3393 -Sr: String is regex
3394 -Srf: Regex and force
3395 -Srff: Regex and force and thaw
3397 in all cases provided there are no further characters in this
3403 for (i = 0; i < nelem(rsopts); i++)
3404 if (Ustrcmp(argrest, rsopts[i]) == 0)
3406 if (i != 2) queue_run_force = TRUE;
3407 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3408 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3409 argrest += Ustrlen(rsopts[i]);
3413 /* -S: Set string to match in addresses for forced queue run to
3414 pick out particular messages. */
3417 deliver_selectstring_sender = argrest;
3418 else if (i+1 < argc)
3419 deliver_selectstring_sender = argv[++i];
3422 fprintf(stderr, "exim: string expected after -S\n");
3427 /* -Tqt is an option that is exclusively for use by the testing suite.
3428 It is not recognized in other circumstances. It allows for the setting up
3429 of explicit "queue times" so that various warning/retry things can be
3430 tested. Otherwise variability of clock ticks etc. cause problems. */
3433 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3434 fudged_queue_times = argv[++i];
3439 /* -t: Set flag to extract recipients from body of message. */
3442 if (*argrest == 0) extract_recipients = TRUE;
3444 /* -ti: Set flag to extract recipients from body of message, and also
3445 specify that dot does not end the message. */
3447 else if (Ustrcmp(argrest, "i") == 0)
3449 extract_recipients = TRUE;
3453 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3456 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3463 /* -U: This means "initial user submission" in sendmail, apparently. The
3464 doc claims that in future sendmail may refuse syntactically invalid
3465 messages instead of fixing them. For the moment, we just ignore it. */
3471 /* -v: verify things - this is a very low-level debugging */
3476 debug_selector |= D_v;
3477 debug_file = stderr;
3483 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3485 The -x flag tells the sendmail command that mail from a local
3486 mail program has National Language Support (NLS) extended characters
3487 in the body of the mail item. The sendmail command can send mail with
3488 extended NLS characters across networks that normally corrupts these
3491 As Exim is 8-bit clean, it just ignores this flag. */
3494 if (*argrest != 0) badarg = TRUE;
3497 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3498 logs to that file. We swallow the parameter and otherwise ignore it. */
3501 if (*argrest == '\0')
3504 fprintf(stderr, "exim: string expected after -X\n");
3510 if (*argrest == '\0')
3511 if (++i < argc) log_oneline = argv[i]; else
3513 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3518 /* All other initial characters are errors */
3523 } /* End of high-level switch statement */
3525 /* Failed to recognize the option, or syntax error */
3529 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3530 "option %s\n", arg);
3536 /* If -R or -S have been specified without -q, assume a single queue run. */
3538 if ( (deliver_selectstring || deliver_selectstring_sender)
3539 && queue_interval < 0)
3544 /* If usage_wanted is set we call the usage function - which never returns */
3545 if (usage_wanted) exim_usage(called_as);
3547 /* Arguments have been processed. Check for incompatibilities. */
3549 (smtp_input || extract_recipients || recipients_arg < argc) &&
3550 (daemon_listen || queue_interval >= 0 || bi_option ||
3551 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3552 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3555 msg_action_arg > 0 &&
3556 (daemon_listen || queue_interval > 0 || list_options ||
3557 (checking && msg_action != MSG_LOAD) ||
3558 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3561 (daemon_listen || queue_interval > 0) &&
3562 (sender_address != NULL || list_options || list_queue || checking ||
3566 daemon_listen && queue_interval == 0
3569 inetd_wait_mode && queue_interval >= 0
3573 (checking || smtp_input || extract_recipients ||
3574 filter_test != FTEST_NONE || bi_option)
3577 verify_address_mode &&
3578 (address_test_mode || smtp_input || extract_recipients ||
3579 filter_test != FTEST_NONE || bi_option)
3582 address_test_mode && (smtp_input || extract_recipients ||
3583 filter_test != FTEST_NONE || bi_option)
3586 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3590 deliver_selectstring != NULL && queue_interval < 0
3593 msg_action == MSG_LOAD &&
3594 (!expansion_test || expansion_test_message != NULL)
3598 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3602 /* If debugging is set up, set the file and the file descriptor to pass on to
3603 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3604 to run in the foreground. */
3606 if (debug_selector != 0)
3608 debug_file = stderr;
3609 debug_fd = fileno(debug_file);
3610 background_daemon = FALSE;
3611 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3612 if (debug_selector != D_v) /* -v only doesn't show this */
3614 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3615 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3617 if (!version_printed)
3618 show_whats_supported(stderr);
3622 /* When started with root privilege, ensure that the limits on the number of
3623 open files and the number of processes (where that is accessible) are
3624 sufficiently large, or are unset, in case Exim has been called from an
3625 environment where the limits are screwed down. Not all OS have the ability to
3626 change some of these limits. */
3630 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3636 #ifdef RLIMIT_NOFILE
3637 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3639 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3641 rlp.rlim_cur = rlp.rlim_max = 0;
3644 /* I originally chose 1000 as a nice big number that was unlikely to
3645 be exceeded. It turns out that some older OS have a fixed upper limit of
3648 if (rlp.rlim_cur < 1000)
3650 rlp.rlim_cur = rlp.rlim_max = 1000;
3651 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3653 rlp.rlim_cur = rlp.rlim_max = 256;
3654 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3655 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3662 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3664 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3666 rlp.rlim_cur = rlp.rlim_max = 0;
3669 #ifdef RLIM_INFINITY
3670 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3672 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3674 if (rlp.rlim_cur < 1000)
3676 rlp.rlim_cur = rlp.rlim_max = 1000;
3678 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3679 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3685 /* Exim is normally entered as root (but some special configurations are
3686 possible that don't do this). However, it always spins off sub-processes that
3687 set their uid and gid as required for local delivery. We don't want to pass on
3688 any extra groups that root may belong to, so we want to get rid of them all at
3691 We need to obey setgroups() at this stage, before possibly giving up root
3692 privilege for a changed configuration file, but later on we might need to
3693 check on the additional groups for the admin user privilege - can't do that
3694 till after reading the config, which might specify the exim gid. Therefore,
3695 save the group list here first. */
3697 group_count = getgroups(NGROUPS_MAX, group_list);
3698 if (group_count < 0)
3700 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3704 /* There is a fundamental difference in some BSD systems in the matter of
3705 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3706 known not to be different. On the "different" systems there is a single group
3707 list, and the first entry in it is the current group. On all other versions of
3708 Unix there is a supplementary group list, which is in *addition* to the current
3709 group. Consequently, to get rid of all extraneous groups on a "standard" system
3710 you pass over 0 groups to setgroups(), while on a "different" system you pass
3711 over a single group - the current group, which is always the first group in the
3712 list. Calling setgroups() with zero groups on a "different" system results in
3713 an error return. The following code should cope with both types of system.
3715 However, if this process isn't running as root, setgroups() can't be used
3716 since you have to be root to run it, even if throwing away groups. Not being
3717 root here happens only in some unusual configurations. We just ignore the
3720 if (setgroups(0, NULL) != 0)
3722 if (setgroups(1, group_list) != 0 && !unprivileged)
3724 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3729 /* If the configuration file name has been altered by an argument on the
3730 command line (either a new file name or a macro definition) and the caller is
3731 not root, or if this is a filter testing run, remove any setuid privilege the
3732 program has and run as the underlying user.
3734 The exim user is locked out of this, which severely restricts the use of -C
3737 Otherwise, set the real ids to the effective values (should be root unless run
3738 from inetd, which it can either be root or the exim uid, if one is configured).
3740 There is a private mechanism for bypassing some of this, in order to make it
3741 possible to test lots of configurations automatically, without having either to
3742 recompile each time, or to patch in an actual configuration file name and other
3743 values (such as the path name). If running in the test harness, pretend that
3744 configuration file changes and macro definitions haven't happened. */
3747 (!trusted_config || /* Config changed, or */
3748 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3749 real_uid != root_uid && /* Not root, and */
3750 !running_in_test_harness /* Not fudged */
3752 expansion_test /* expansion testing */
3754 filter_test != FTEST_NONE) /* Filter testing */
3756 setgroups(group_count, group_list);
3757 exim_setugid(real_uid, real_gid, FALSE,
3758 US"-C, -D, -be or -bf forces real uid");
3759 removed_privilege = TRUE;
3761 /* In the normal case when Exim is called like this, stderr is available
3762 and should be used for any logging information because attempts to write
3763 to the log will usually fail. To arrange this, we unset really_exim. However,
3764 if no stderr is available there is no point - we might as well have a go
3765 at the log (if it fails, syslog will be written).
3767 Note that if the invoker is Exim, the logs remain available. Messing with
3768 this causes unlogged successful deliveries. */
3770 if ((log_stderr != NULL) && (real_uid != exim_uid))
3771 really_exim = FALSE;
3774 /* Privilege is to be retained for the moment. It may be dropped later,
3775 depending on the job that this Exim process has been asked to do. For now, set
3776 the real uid to the effective so that subsequent re-execs of Exim are done by a
3779 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3781 /* If testing a filter, open the file(s) now, before wasting time doing other
3782 setups and reading the message. */
3784 if ((filter_test & FTEST_SYSTEM) != 0)
3786 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3789 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3791 return EXIT_FAILURE;
3795 if ((filter_test & FTEST_USER) != 0)
3797 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3800 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3802 return EXIT_FAILURE;
3806 /* Initialise lookup_list
3807 If debugging, already called above via version reporting.
3808 In either case, we initialise the list of available lookups while running
3809 as root. All dynamically modules are loaded from a directory which is
3810 hard-coded into the binary and is code which, if not a module, would be
3811 part of Exim already. Ability to modify the content of the directory
3812 is equivalent to the ability to modify a setuid binary!
3814 This needs to happen before we read the main configuration. */
3818 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3821 /* Read the main runtime configuration data; this gives up if there
3822 is a failure. It leaves the configuration file open so that the subsequent
3823 configuration data for delivery can be read if needed.
3825 NOTE: immediatly after opening the configuration file we change the working
3826 directory to "/"! Later we change to $spool_directory. We do it there, because
3827 during readconf_main() some expansion takes place already. */
3829 /* Store the initial cwd before we change directories. Can be NULL if the
3830 dir has already been unlinked. */
3831 initial_cwd = os_getcwd(NULL, 0);
3834 -be[m] expansion test -
3835 -b[fF] filter test new
3837 -bmalware malware_test_file new
3839 -brw rewrite test new
3841 -bv[s] address verify -
3843 -bP <option> (except -bP config, which sets list_config)
3845 If any of these options is set, we suppress warnings about configuration
3846 issues (currently about tls_advertise_hosts and keep_environment not being
3849 readconf_main(checking || list_options);
3851 if (builtin_macros_create_trigger) DEBUG(D_any)
3852 debug_printf("Builtin macros created (expensive) due to config line '%.*s'\n",
3853 Ustrlen(builtin_macros_create_trigger)-1, builtin_macros_create_trigger);
3855 /* Now in directory "/" */
3857 if (cleanup_environment() == FALSE)
3858 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3861 /* If an action on specific messages is requested, or if a daemon or queue
3862 runner is being started, we need to know if Exim was called by an admin user.
3863 This is the case if the real user is root or exim, or if the real group is
3864 exim, or if one of the supplementary groups is exim or a group listed in
3865 admin_groups. We don't fail all message actions immediately if not admin_user,
3866 since some actions can be performed by non-admin users. Instead, set admin_user
3867 for later interrogation. */
3869 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3874 for (i = 0; i < group_count && !admin_user; i++)
3875 if (group_list[i] == exim_gid)
3877 else if (admin_groups)
3878 for (j = 1; j <= (int)admin_groups[0] && !admin_user; j++)
3879 if (admin_groups[j] == group_list[i])
3883 /* Another group of privileged users are the trusted users. These are root,
3884 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3885 are permitted to specify sender_addresses with -f on the command line, and
3886 other message parameters as well. */
3888 if (real_uid == root_uid || real_uid == exim_uid)
3889 trusted_caller = TRUE;
3895 for (i = 1; i <= (int)trusted_users[0] && !trusted_caller; i++)
3896 if (trusted_users[i] == real_uid)
3897 trusted_caller = TRUE;
3900 for (i = 1; i <= (int)trusted_groups[0] && !trusted_caller; i++)
3901 if (trusted_groups[i] == real_gid)
3902 trusted_caller = TRUE;
3903 else for (j = 0; j < group_count && !trusted_caller; j++)
3904 if (trusted_groups[i] == group_list[j])
3905 trusted_caller = TRUE;
3908 /* At this point, we know if the user is privileged and some command-line
3909 options become possibly impermissible, depending upon the configuration file. */
3911 if (checking && commandline_checks_require_admin && !admin_user) {
3912 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3916 /* Handle the decoding of logging options. */
3918 decode_bits(log_selector, log_selector_size, log_notall,
3919 log_selector_string, log_options, log_options_count, US"log", 0);
3924 debug_printf("configuration file is %s\n", config_main_filename);
3925 debug_printf("log selectors =");
3926 for (i = 0; i < log_selector_size; i++)
3927 debug_printf(" %08x", log_selector[i]);
3931 /* If domain literals are not allowed, check the sender address that was
3932 supplied with -f. Ditto for a stripped trailing dot. */
3934 if (sender_address != NULL)
3936 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3938 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3939 "allowed\n", sender_address);
3940 return EXIT_FAILURE;
3942 if (f_end_dot && !strip_trailing_dot)
3944 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3945 "(trailing dot not allowed)\n", sender_address);
3946 return EXIT_FAILURE;
3950 /* See if an admin user overrode our logging. */
3952 if (cmdline_syslog_name != NULL)
3956 syslog_processname = cmdline_syslog_name;
3957 log_file_path = string_copy(CUS"syslog");
3961 /* not a panic, non-privileged users should not be able to spam paniclog */
3963 "exim: you lack sufficient privilege to specify syslog process name\n");
3964 return EXIT_FAILURE;
3968 /* Paranoia check of maximum lengths of certain strings. There is a check
3969 on the length of the log file path in log.c, which will come into effect
3970 if there are any calls to write the log earlier than this. However, if we
3971 get this far but the string is very long, it is better to stop now than to
3972 carry on and (e.g.) receive a message and then have to collapse. The call to
3973 log_write() from here will cause the ultimate panic collapse if the complete
3974 file name exceeds the buffer length. */
3976 if (Ustrlen(log_file_path) > 200)
3977 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3978 "log_file_path is longer than 200 chars: aborting");
3980 if (Ustrlen(pid_file_path) > 200)
3981 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3982 "pid_file_path is longer than 200 chars: aborting");
3984 if (Ustrlen(spool_directory) > 200)
3985 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3986 "spool_directory is longer than 200 chars: aborting");
3988 /* Length check on the process name given to syslog for its TAG field,
3989 which is only permitted to be 32 characters or less. See RFC 3164. */
3991 if (Ustrlen(syslog_processname) > 32)
3992 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3993 "syslog_processname is longer than 32 chars: aborting");
3998 log_write(0, LOG_MAIN, "%s", log_oneline);
3999 return EXIT_SUCCESS;
4002 return EXIT_FAILURE;
4004 /* In some operating systems, the environment variable TMPDIR controls where
4005 temporary files are created; Exim doesn't use these (apart from when delivering
4006 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4007 If TMPDIR is found in the environment, reset it to the value defined in the
4008 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4009 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4010 EXIM_TMPDIR by the build scripts.
4016 if (environ) for (p = USS environ; *p; p++)
4017 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4019 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4020 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4022 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4027 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4028 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4029 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4030 called by a user who has set the TZ variable. This then affects the timestamps
4031 in log files and in Received: headers, and any created Date: header lines. The
4032 required timezone is settable in the configuration file, so nothing can be done
4033 about this earlier - but hopefully nothing will normally be logged earlier than
4034 this. We have to make a new environment if TZ is wrong, but don't bother if
4035 timestamps_utc is set, because then all times are in UTC anyway. */
4037 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4038 timestamps_utc = TRUE;
4041 uschar *envtz = US getenv("TZ");
4043 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4044 : timezone_string != NULL
4047 uschar **p = USS environ;
4051 if (environ) while (*p++) count++;
4052 if (!envtz) count++;
4053 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4054 if (environ) for (p = USS environ; *p; p++)
4055 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4056 if (timezone_string)
4058 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4059 sprintf(CS *newp++, "TZ=%s", timezone_string);
4064 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4065 tod_stamp(tod_log));
4069 /* Handle the case when we have removed the setuid privilege because of -C or
4070 -D. This means that the caller of Exim was not root.
4072 There is a problem if we were running as the Exim user. The sysadmin may
4073 expect this case to retain privilege because "the binary was called by the
4074 Exim user", but it hasn't, because either the -D option set macros, or the
4075 -C option set a non-trusted configuration file. There are two possibilities:
4077 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4078 to do message deliveries. Thus, the fact that it is running as a
4079 non-privileged user is plausible, and might be wanted in some special
4080 configurations. However, really_exim will have been set false when
4081 privilege was dropped, to stop Exim trying to write to its normal log
4082 files. Therefore, re-enable normal log processing, assuming the sysadmin
4083 has set up the log directory correctly.
4085 (2) If deliver_drop_privilege is not set, the configuration won't work as
4086 apparently intended, and so we log a panic message. In order to retain
4087 root for -C or -D, the caller must either be root or be invoking a
4088 trusted configuration file (when deliver_drop_privilege is false). */
4090 if ( removed_privilege
4091 && (!trusted_config || opt_D_used)
4092 && real_uid == exim_uid)
4093 if (deliver_drop_privilege)
4094 really_exim = TRUE; /* let logging work normally */
4096 log_write(0, LOG_MAIN|LOG_PANIC,
4097 "exim user lost privilege for using %s option",
4098 trusted_config? "-D" : "-C");
4100 /* Start up Perl interpreter if Perl support is configured and there is a
4101 perl_startup option, and the configuration or the command line specifies
4102 initializing starting. Note that the global variables are actually called
4103 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4106 if (perl_start_option != 0)
4107 opt_perl_at_start = (perl_start_option > 0);
4108 if (opt_perl_at_start && opt_perl_startup != NULL)
4111 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4112 errstr = init_perl(opt_perl_startup);
4115 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4116 return EXIT_FAILURE;
4118 opt_perl_started = TRUE;
4120 #endif /* EXIM_PERL */
4122 /* Log the arguments of the call if the configuration file said so. This is
4123 a debugging feature for finding out what arguments certain MUAs actually use.
4124 Don't attempt it if logging is disabled, or if listing variables or if
4125 verifying/testing addresses or expansions. */
4127 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4128 && really_exim && !list_options && !checking)
4131 uschar *p = big_buffer;
4132 Ustrcpy(p, "cwd= (failed)");
4134 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4137 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4139 for (i = 0; i < argc; i++)
4141 int len = Ustrlen(argv[i]);
4142 const uschar *printing;
4144 if (p + len + 8 >= big_buffer + big_buffer_size)
4147 log_write(0, LOG_MAIN, "%s", big_buffer);
4148 Ustrcpy(big_buffer, "...");
4151 printing = string_printing(argv[i]);
4152 if (printing[0] == 0) quote = US"\""; else
4154 const uschar *pp = printing;
4156 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4158 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4159 (p - big_buffer) - 4), printing, quote);
4162 if (LOGGING(arguments))
4163 log_write(0, LOG_MAIN, "%s", big_buffer);
4165 debug_printf("%s\n", big_buffer);
4168 /* Set the working directory to be the top-level spool directory. We don't rely
4169 on this in the code, which always uses fully qualified names, but it's useful
4170 for core dumps etc. Don't complain if it fails - the spool directory might not
4171 be generally accessible and calls with the -C option (and others) have lost
4172 privilege by now. Before the chdir, we try to ensure that the directory exists.
4175 if (Uchdir(spool_directory) != 0)
4178 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4179 dummy = /* quieten compiler */ Uchdir(spool_directory);
4180 dummy = dummy; /* yet more compiler quietening, sigh */
4183 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4184 alias file. Exim doesn't have such a concept, but this call is screwed into
4185 Sun's YP makefiles. Handle this by calling a configured script, as the real
4186 user who called Exim. The -oA option can be used to pass an argument to the
4191 (void)fclose(config_file);
4192 if (bi_command != NULL)
4196 argv[i++] = bi_command;
4197 if (alias_arg != NULL) argv[i++] = alias_arg;
4200 setgroups(group_count, group_list);
4201 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4203 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4204 (argv[1] == NULL)? US"" : argv[1]);
4206 execv(CS argv[0], (char *const *)argv);
4207 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4212 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4217 /* We moved the admin/trusted check to be immediately after reading the
4218 configuration file. We leave these prints here to ensure that syslog setup,
4219 logfile setup, and so on has already happened. */
4221 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4222 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4224 /* Only an admin user may start the daemon or force a queue run in the default
4225 configuration, but the queue run restriction can be relaxed. Only an admin
4226 user may request that a message be returned to its sender forthwith. Only an
4227 admin user may specify a debug level greater than D_v (because it might show
4228 passwords, etc. in lookup queries). Only an admin user may request a queue
4229 count. Only an admin user can use the test interface to scan for email
4230 (because Exim will be in the spool dir and able to look at mails). */
4234 BOOL debugset = (debug_selector & ~D_v) != 0;
4235 if (deliver_give_up || daemon_listen || malware_test_file ||
4236 (count_queue && queue_list_requires_admin) ||
4237 (list_queue && queue_list_requires_admin) ||
4238 (queue_interval >= 0 && prod_requires_admin) ||
4239 (debugset && !running_in_test_harness))
4241 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4246 /* If the real user is not root or the exim uid, the argument for passing
4247 in an open TCP/IP connection for another message is not permitted, nor is
4248 running with the -N option for any delivery action, unless this call to exim is
4249 one that supplied an input message, or we are using a patched exim for
4250 regression testing. */
4252 if (real_uid != root_uid && real_uid != exim_uid &&
4253 (continue_hostname != NULL ||
4255 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4256 )) && !running_in_test_harness)
4258 fprintf(stderr, "exim: Permission denied\n");
4259 return EXIT_FAILURE;
4262 /* If the caller is not trusted, certain arguments are ignored when running for
4263 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4264 Note that authority for performing certain actions on messages is tested in the
4265 queue_action() function. */
4267 if (!trusted_caller && !checking)
4269 sender_host_name = sender_host_address = interface_address =
4270 sender_ident = received_protocol = NULL;
4271 sender_host_port = interface_port = 0;
4272 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4275 /* If a sender host address is set, extract the optional port number off the
4276 end of it and check its syntax. Do the same thing for the interface address.
4277 Exim exits if the syntax is bad. */
4281 if (sender_host_address != NULL)
4282 sender_host_port = check_port(sender_host_address);
4283 if (interface_address != NULL)
4284 interface_port = check_port(interface_address);
4287 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4292 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4293 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4297 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4298 return EXIT_FAILURE;
4302 /* If an SMTP message is being received check to see if the standard input is a
4303 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4304 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4309 union sockaddr_46 inetd_sock;
4310 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4311 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4313 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4314 if (family == AF_INET || family == AF_INET6)
4316 union sockaddr_46 interface_sock;
4317 size = sizeof(interface_sock);
4319 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4320 interface_address = host_ntoa(-1, &interface_sock, NULL,
4323 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4325 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4328 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4329 NULL, &sender_host_port);
4330 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4331 "inetd is not supported when mua_wrapper is set");
4336 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4337 return EXIT_FAILURE;
4343 /* If the load average is going to be needed while receiving a message, get it
4344 now for those OS that require the first call to os_getloadavg() to be done as
4345 root. There will be further calls later for each message received. */
4347 #ifdef LOAD_AVG_NEEDS_ROOT
4348 if (receiving_message &&
4349 (queue_only_load >= 0 ||
4350 (is_inetd && smtp_load_reserve >= 0)
4353 load_average = OS_GETLOADAVG();
4357 /* The queue_only configuration option can be overridden by -odx on the command
4358 line, except that if queue_only_override is false, queue_only cannot be unset
4359 from the command line. */
4361 if (queue_only_set && (queue_only_override || arg_queue_only))
4362 queue_only = arg_queue_only;
4364 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4367 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4368 if (arg_smtp_receive_timeout >= 0)
4369 smtp_receive_timeout = arg_smtp_receive_timeout;
4371 /* If Exim was started with root privilege, unless we have already removed the
4372 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4373 except when starting the daemon or doing some kind of delivery or address
4374 testing (-bt). These are the only cases when root need to be retained. We run
4375 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4376 retained only for starting the daemon. We always do the initgroups() in this
4377 situation (controlled by the TRUE below), in order to be as close as possible
4378 to the state Exim usually runs in. */
4380 if (!unprivileged && /* originally had root AND */
4381 !removed_privilege && /* still got root AND */
4382 !daemon_listen && /* not starting the daemon */
4383 queue_interval <= 0 && /* (either kind of daemon) */
4385 deliver_drop_privilege || /* requested unprivileged */
4387 queue_interval < 0 && /* not running the queue */
4388 (msg_action_arg < 0 || /* and */
4389 msg_action != MSG_DELIVER) && /* not delivering and */
4390 (!checking || !address_test_mode) /* not address checking */
4392 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4394 /* When we are retaining a privileged uid, we still change to the exim gid. */
4399 rv = setgid(exim_gid);
4400 /* Impact of failure is that some stuff might end up with an incorrect group.
4401 We track this for failures from root, since any attempt to change privilege
4402 by root should succeed and failures should be examined. For non-root,
4403 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4404 no need to complain then. */
4406 if (!(unprivileged || removed_privilege))
4409 "exim: changing group failed: %s\n", strerror(errno));
4413 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4414 (long int)exim_gid, strerror(errno));
4417 /* Handle a request to scan a file for malware */
4418 if (malware_test_file)
4420 #ifdef WITH_CONTENT_SCAN
4422 set_process_info("scanning file for malware");
4423 result = malware_in_file(malware_test_file);
4426 printf("No malware found.\n");
4431 printf("Malware lookup returned non-okay/fail: %d\n", result);
4435 printf("Malware found: %s\n", malware_name);
4437 printf("Malware scan detected malware of unknown name.\n");
4439 printf("Malware scanning not enabled at compile time.\n");
4444 /* Handle a request to list the delivery queue */
4448 set_process_info("listing the queue");
4449 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4453 /* Handle a request to count the delivery queue */
4457 set_process_info("counting the queue");
4462 /* Handle actions on specific messages, except for the force delivery and
4463 message load actions, which are done below. Some actions take a whole list of
4464 message ids, which are known to continue up to the end of the arguments. Others
4465 take a single message id and then operate on the recipients list. */
4467 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4469 int yield = EXIT_SUCCESS;
4470 set_process_info("acting on specified messages");
4472 if (!one_msg_action)
4474 for (i = msg_action_arg; i < argc; i++)
4475 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4476 yield = EXIT_FAILURE;
4479 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4480 recipients_arg)) yield = EXIT_FAILURE;
4484 /* We used to set up here to skip reading the ACL section, on
4485 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4486 Now, since the intro of the ${acl } expansion, ACL definitions may be
4487 needed in transports so we lost the optimisation. */
4491 /* The configuration data will have been read into POOL_PERM because we won't
4492 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4493 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4494 configuration were read into POOL_MAIN, because we don't do any resets till
4495 later on. However, it seems right, and it does ensure that both pools get used.
4498 store_pool = POOL_MAIN;
4500 /* Handle the -brt option. This is for checking out retry configurations.
4501 The next three arguments are a domain name or a complete address, and
4502 optionally two error numbers. All it does is to call the function that
4503 scans the retry configuration data. */
4505 if (test_retry_arg >= 0)
4507 retry_config *yield;
4508 int basic_errno = 0;
4512 if (test_retry_arg >= argc)
4514 printf("-brt needs a domain or address argument\n");
4515 exim_exit(EXIT_FAILURE, US"main");
4517 s1 = argv[test_retry_arg++];
4520 /* If the first argument contains no @ and no . it might be a local user
4521 or it might be a single-component name. Treat as a domain. */
4523 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4525 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4526 "being \ntreated as a one-component domain, not as a local part.\n\n",
4530 /* There may be an optional second domain arg. */
4532 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4533 s2 = argv[test_retry_arg++];
4535 /* The final arg is an error name */
4537 if (test_retry_arg < argc)
4539 uschar *ss = argv[test_retry_arg];
4541 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4544 printf("%s\n", CS error);
4545 return EXIT_FAILURE;
4548 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4549 code > 100 as an error is for matching codes to the decade. Turn them into
4550 a real error code, off the decade. */
4552 if (basic_errno == ERRNO_MAIL4XX ||
4553 basic_errno == ERRNO_RCPT4XX ||
4554 basic_errno == ERRNO_DATA4XX)
4556 int code = (more_errno >> 8) & 255;
4558 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4559 else if (code > 100)
4560 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4564 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4565 printf("No retry information found\n");
4569 more_errno = yield->more_errno;
4570 printf("Retry rule: %s ", yield->pattern);
4572 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4574 printf("quota%s%s ",
4575 (more_errno > 0)? "_" : "",
4576 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4578 else if (yield->basic_errno == ECONNREFUSED)
4580 printf("refused%s%s ",
4581 (more_errno > 0)? "_" : "",
4582 (more_errno == 'M')? "MX" :
4583 (more_errno == 'A')? "A" : "");
4585 else if (yield->basic_errno == ETIMEDOUT)
4588 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4590 if (more_errno != 0) printf("_%s",
4591 (more_errno == 'M')? "MX" : "A");
4594 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4595 printf("auth_failed ");
4598 for (r = yield->rules; r; r = r->next)
4600 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4601 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4607 printf(",%d.", x/1000);
4621 exim_exit(EXIT_SUCCESS, US"main");
4624 /* Handle a request to list one or more configuration options */
4625 /* If -n was set, we suppress some information */
4629 set_process_info("listing variables");
4630 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4631 else for (i = recipients_arg; i < argc; i++)
4634 (Ustrcmp(argv[i], "router") == 0 ||
4635 Ustrcmp(argv[i], "transport") == 0 ||
4636 Ustrcmp(argv[i], "authenticator") == 0 ||
4637 Ustrcmp(argv[i], "macro") == 0 ||
4638 Ustrcmp(argv[i], "environment") == 0))
4640 readconf_print(argv[i+1], argv[i], flag_n);
4643 else readconf_print(argv[i], NULL, flag_n);
4645 exim_exit(EXIT_SUCCESS, US"main");
4650 set_process_info("listing config");
4651 readconf_print(US"config", NULL, flag_n);
4652 exim_exit(EXIT_SUCCESS, US"main");
4656 /* Initialise subsystems as required */
4657 #ifndef DISABLE_DKIM
4663 /* Handle a request to deliver one or more messages that are already on the
4664 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4665 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4667 Delivery of specific messages is typically used for a small number when
4668 prodding by hand (when the option forced_delivery will be set) or when
4669 re-execing to regain root privilege. Each message delivery must happen in a
4670 separate process, so we fork a process for each one, and run them sequentially
4671 so that debugging output doesn't get intertwined, and to avoid spawning too
4672 many processes if a long list is given. However, don't fork for the last one;
4673 this saves a process in the common case when Exim is called to deliver just one
4676 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4678 if (prod_requires_admin && !admin_user)
4680 fprintf(stderr, "exim: Permission denied\n");
4681 exim_exit(EXIT_FAILURE, US"main");
4683 set_process_info("delivering specified messages");
4684 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4685 for (i = msg_action_arg; i < argc; i++)
4690 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4691 else if ((pid = fork()) == 0)
4693 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4694 _exit(EXIT_SUCCESS);
4698 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4700 exim_exit(EXIT_FAILURE, US"main");
4704 exim_exit(EXIT_SUCCESS, US"main");
4708 /* If only a single queue run is requested, without SMTP listening, we can just
4709 turn into a queue runner, with an optional starting message id. */
4711 if (queue_interval == 0 && !daemon_listen)
4713 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4714 (start_queue_run_id == NULL)? US"" : US" starting at ",
4715 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4716 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4717 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4719 set_process_info("running the '%s' queue (single queue run)", queue_name);
4721 set_process_info("running the queue (single queue run)");
4722 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4723 exim_exit(EXIT_SUCCESS, US"main");
4727 /* Find the login name of the real user running this process. This is always
4728 needed when receiving a message, because it is written into the spool file. It
4729 may also be used to construct a from: or a sender: header, and in this case we
4730 need the user's full name as well, so save a copy of it, checked for RFC822
4731 syntax and munged if necessary, if it hasn't previously been set by the -F
4732 argument. We may try to get the passwd entry more than once, in case NIS or
4733 other delays are in evidence. Save the home directory for use in filter testing
4738 if ((pw = getpwuid(real_uid)) != NULL)
4740 originator_login = string_copy(US pw->pw_name);
4741 originator_home = string_copy(US pw->pw_dir);
4743 /* If user name has not been set by -F, set it from the passwd entry
4744 unless -f has been used to set the sender address by a trusted user. */
4746 if (!originator_name)
4748 if (!sender_address || (!trusted_caller && filter_test == FTEST_NONE))
4750 uschar *name = US pw->pw_gecos;
4751 uschar *amp = Ustrchr(name, '&');
4754 /* Most Unix specify that a '&' character in the gecos field is
4755 replaced by a copy of the login name, and some even specify that
4756 the first character should be upper cased, so that's what we do. */
4761 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4762 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4763 buffer[loffset] = toupper(buffer[loffset]);
4767 /* If a pattern for matching the gecos field was supplied, apply
4768 it and then expand the name string. */
4770 if (gecos_pattern && gecos_name)
4773 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4775 if (regex_match_and_setup(re, name, 0, -1))
4777 uschar *new_name = expand_string(gecos_name);
4781 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4782 "gecos field \"%s\"\n", new_name, name);
4785 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4786 "\"%s\": %s\n", gecos_name, expand_string_message);
4788 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4789 "gecos field \"%s\"\n", gecos_pattern, name);
4790 store_free((void *)re);
4792 originator_name = string_copy(name);
4795 /* A trusted caller has used -f but not -F */
4797 else originator_name = US"";
4800 /* Break the retry loop */
4805 if (++i > finduser_retries) break;
4809 /* If we cannot get a user login, log the incident and give up, unless the
4810 configuration specifies something to use. When running in the test harness,
4811 any setting of unknown_login overrides the actual name. */
4813 if (originator_login == NULL || running_in_test_harness)
4815 if (unknown_login != NULL)
4817 originator_login = expand_string(unknown_login);
4818 if (originator_name == NULL && unknown_username != NULL)
4819 originator_name = expand_string(unknown_username);
4820 if (originator_name == NULL) originator_name = US"";
4822 if (originator_login == NULL)
4823 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4827 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4830 originator_name = string_copy(parse_fix_phrase(originator_name,
4831 Ustrlen(originator_name), big_buffer, big_buffer_size));
4833 /* If a message is created by this call of Exim, the uid/gid of its originator
4834 are those of the caller. These values are overridden if an existing message is
4835 read in from the spool. */
4837 originator_uid = real_uid;
4838 originator_gid = real_gid;
4840 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4841 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4843 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4844 returns. We leave this till here so that the originator_ fields are available
4845 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4848 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4852 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4853 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4854 "mua_wrapper is set");
4859 /* If the sender ident has not been set (by a trusted caller) set it to
4860 the caller. This will get overwritten below for an inetd call. If a trusted
4861 caller has set it empty, unset it. */
4863 if (sender_ident == NULL) sender_ident = originator_login;
4864 else if (sender_ident[0] == 0) sender_ident = NULL;
4866 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4867 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4868 originator_* variables set. */
4870 if (test_rewrite_arg >= 0)
4872 really_exim = FALSE;
4873 if (test_rewrite_arg >= argc)
4875 printf("-brw needs an address argument\n");
4876 exim_exit(EXIT_FAILURE, US"main");
4878 rewrite_test(argv[test_rewrite_arg]);
4879 exim_exit(EXIT_SUCCESS, US"main");
4882 /* A locally-supplied message is considered to be coming from a local user
4883 unless a trusted caller supplies a sender address with -f, or is passing in the
4884 message via SMTP (inetd invocation or otherwise). */
4886 if ((sender_address == NULL && !smtp_input) ||
4887 (!trusted_caller && filter_test == FTEST_NONE))
4889 sender_local = TRUE;
4891 /* A trusted caller can supply authenticated_sender and authenticated_id
4892 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4893 defaults except when host checking. */
4895 if (authenticated_sender == NULL && !host_checking)
4896 authenticated_sender = string_sprintf("%s@%s", originator_login,
4897 qualify_domain_sender);
4898 if (authenticated_id == NULL && !host_checking)
4899 authenticated_id = originator_login;
4902 /* Trusted callers are always permitted to specify the sender address.
4903 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4904 is specified is the empty address. However, if a trusted caller does not
4905 specify a sender address for SMTP input, we leave sender_address unset. This
4906 causes the MAIL commands to be honoured. */
4908 if ((!smtp_input && sender_address == NULL) ||
4909 !receive_check_set_sender(sender_address))
4911 /* Either the caller is not permitted to set a general sender, or this is
4912 non-SMTP input and the trusted caller has not set a sender. If there is no
4913 sender, or if a sender other than <> is set, override with the originator's
4914 login (which will get qualified below), except when checking things. */
4916 if (sender_address == NULL /* No sender_address set */
4918 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4919 !checking)) /* Not running tests, including filter tests */
4921 sender_address = originator_login;
4922 sender_address_forced = FALSE;
4923 sender_address_domain = 0;
4927 /* Remember whether an untrusted caller set the sender address */
4929 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4931 /* Ensure that the sender address is fully qualified unless it is the empty
4932 address, which indicates an error message, or doesn't exist (root caller, smtp
4933 interface, no -f argument). */
4935 if (sender_address != NULL && sender_address[0] != 0 &&
4936 sender_address_domain == 0)
4937 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4938 qualify_domain_sender);
4940 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4942 /* Handle a request to verify a list of addresses, or test them for delivery.
4943 This must follow the setting of the sender address, since routers can be
4944 predicated upon the sender. If no arguments are given, read addresses from
4945 stdin. Set debug_level to at least D_v to get full output for address testing.
4948 if (verify_address_mode || address_test_mode)
4951 int flags = vopt_qualify;
4953 if (verify_address_mode)
4955 if (!verify_as_sender) flags |= vopt_is_recipient;
4956 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4961 flags |= vopt_is_recipient;
4962 debug_selector |= D_v;
4963 debug_file = stderr;
4964 debug_fd = fileno(debug_file);
4965 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4968 if (recipients_arg < argc)
4970 while (recipients_arg < argc)
4972 uschar *s = argv[recipients_arg++];
4975 BOOL finished = FALSE;
4976 uschar *ss = parse_find_address_end(s, FALSE);
4977 if (*ss == ',') *ss = 0; else finished = TRUE;
4978 test_address(s, flags, &exit_value);
4981 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4988 uschar *s = get_stdinput(NULL, NULL);
4989 if (s == NULL) break;
4990 test_address(s, flags, &exit_value);
4994 exim_exit(exit_value, US"main");
4997 /* Handle expansion checking. Either expand items on the command line, or read
4998 from stdin if there aren't any. If -Mset was specified, load the message so
4999 that its variables can be used, but restrict this facility to admin users.
5000 Otherwise, if -bem was used, read a message from stdin. */
5004 dns_init(FALSE, FALSE, FALSE);
5005 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5007 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
5010 fprintf(stderr, "exim: permission denied\n");
5013 message_id = argv[msg_action_arg];
5014 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
5015 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5016 printf ("Failed to load message datafile %s\n", message_id);
5017 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5018 printf ("Failed to load message %s\n", message_id);
5021 /* Read a test message from a file. We fudge it up to be on stdin, saving
5022 stdin itself for later reading of expansion strings. */
5024 else if (expansion_test_message)
5026 int save_stdin = dup(0);
5027 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5030 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5032 return EXIT_FAILURE;
5035 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5036 message_ended = END_NOTENDED;
5037 read_message_body(receive_msg(extract_recipients));
5038 message_linecount += body_linecount;
5039 (void)dup2(save_stdin, 0);
5040 (void)close(save_stdin);
5041 clearerr(stdin); /* Required by Darwin */
5044 /* Only admin users may see config-file macros this way */
5046 if (!admin_user) macros = mlast = NULL;
5048 /* Allow $recipients for this testing */
5050 enable_dollar_recipients = TRUE;
5052 /* Expand command line items */
5054 if (recipients_arg < argc)
5055 while (recipients_arg < argc)
5056 expansion_test_line(argv[recipients_arg++]);
5062 char *(*fn_readline)(const char *) = NULL;
5063 void (*fn_addhist)(const char *) = NULL;
5067 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5070 while (s = get_stdinput(fn_readline, fn_addhist))
5071 expansion_test_line(s);
5074 if (dlhandle) dlclose(dlhandle);
5078 /* The data file will be open after -Mset */
5080 if (deliver_datafile >= 0)
5082 (void)close(deliver_datafile);
5083 deliver_datafile = -1;
5086 exim_exit(EXIT_SUCCESS, US"main: expansion test");
5090 /* The active host name is normally the primary host name, but it can be varied
5091 for hosts that want to play several parts at once. We need to ensure that it is
5092 set for host checking, and for receiving messages. */
5094 smtp_active_hostname = primary_hostname;
5095 if (raw_active_hostname != NULL)
5097 uschar *nah = expand_string(raw_active_hostname);
5100 if (!expand_string_forcedfail)
5101 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5102 "(smtp_active_hostname): %s", raw_active_hostname,
5103 expand_string_message);
5105 else if (nah[0] != 0) smtp_active_hostname = nah;
5108 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5109 given IP address so that the blocking and relay configuration can be tested.
5110 Unless a sender_ident was set by -oMt, we discard it (the default is the
5111 caller's login name). An RFC 1413 call is made only if we are running in the
5112 test harness and an incoming interface and both ports are specified, because
5113 there is no TCP/IP call to find the ident for. */
5120 if (!sender_ident_set)
5122 sender_ident = NULL;
5123 if (running_in_test_harness && sender_host_port != 0 &&
5124 interface_address != NULL && interface_port != 0)
5125 verify_get_ident(1413);
5128 /* In case the given address is a non-canonical IPv6 address, canonicalize
5129 it. The code works for both IPv4 and IPv6, as it happens. */
5131 size = host_aton(sender_host_address, x);
5132 sender_host_address = store_get(48); /* large enough for full IPv6 */
5133 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5135 /* Now set up for testing */
5137 host_build_sender_fullhost();
5141 sender_local = FALSE;
5142 sender_host_notsocket = TRUE;
5143 debug_file = stderr;
5144 debug_fd = fileno(debug_file);
5145 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5146 "**** but without any ident (RFC 1413) callback.\n"
5147 "**** This is not for real!\n\n",
5148 sender_host_address);
5150 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5151 if (verify_check_host(&hosts_connection_nolog) == OK)
5152 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5153 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5155 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5156 because a log line has already been written for all its failure exists
5157 (usually "connection refused: <reason>") and writing another one is
5158 unnecessary clutter. */
5160 if (smtp_start_session())
5162 for (reset_point = store_get(0); ; store_reset(reset_point))
5164 if (smtp_setup_msg() <= 0) break;
5165 if (!receive_msg(FALSE)) break;
5167 return_path = sender_address = NULL;
5168 dnslist_domain = dnslist_matched = NULL;
5169 #ifndef DISABLE_DKIM
5170 dkim_cur_signer = NULL;
5173 deliver_localpart_orig = NULL;
5174 deliver_domain_orig = NULL;
5175 callout_address = sending_ip_address = NULL;
5176 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5180 exim_exit(EXIT_SUCCESS, US"main");
5184 /* Arrange for message reception if recipients or SMTP were specified;
5185 otherwise complain unless a version print (-bV) happened or this is a filter
5186 verification test or info dump.
5187 In the former case, show the configuration file name. */
5189 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5191 if (version_printed)
5193 printf("Configuration file is %s\n", config_main_filename);
5194 return EXIT_SUCCESS;
5197 if (info_flag != CMDINFO_NONE)
5199 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5200 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5203 if (filter_test == FTEST_NONE)
5204 exim_usage(called_as);
5208 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5209 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5210 that we are not called from inetd, because that is rejected above. The
5211 following configuration settings are forced here:
5213 (1) Synchronous delivery (-odi)
5214 (2) Errors to stderr (-oep == -oeq)
5215 (3) No parallel remote delivery
5216 (4) Unprivileged delivery
5218 We don't force overall queueing options because there are several of them;
5219 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5220 to override any SMTP queueing. */
5224 synchronous_delivery = TRUE;
5225 arg_error_handling = ERRORS_STDERR;
5226 remote_max_parallel = 1;
5227 deliver_drop_privilege = TRUE;
5229 queue_smtp_domains = NULL;
5231 message_utf8_downconvert = -1; /* convert-if-needed */
5236 /* Prepare to accept one or more new messages on the standard input. When a
5237 message has been read, its id is returned in message_id[]. If doing immediate
5238 delivery, we fork a delivery process for each received message, except for the
5239 last one, where we can save a process switch.
5241 It is only in non-smtp mode that error_handling is allowed to be changed from
5242 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5243 sendmail error modes other than -oem ever actually used? Later: yes.) */
5245 if (!smtp_input) error_handling = arg_error_handling;
5247 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5248 logging being sent down the socket and make an identd call to get the
5253 (void)fclose(stderr);
5254 exim_nullstd(); /* Re-open to /dev/null */
5255 verify_get_ident(IDENT_PORT);
5256 host_build_sender_fullhost();
5257 set_process_info("handling incoming connection from %s via inetd",
5261 /* If the sender host address has been set, build sender_fullhost if it hasn't
5262 already been done (which it will have been for inetd). This caters for the
5263 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5264 so that the test for IP options is skipped for -bs input. */
5266 if (sender_host_address != NULL && sender_fullhost == NULL)
5268 host_build_sender_fullhost();
5269 set_process_info("handling incoming connection from %s via -oMa",
5271 sender_host_notsocket = TRUE;
5274 /* Otherwise, set the sender host as unknown except for inetd calls. This
5275 prevents host checking in the case of -bs not from inetd and also for -bS. */
5277 else if (!is_inetd) sender_host_unknown = TRUE;
5279 /* If stdout does not exist, then dup stdin to stdout. This can happen
5280 if exim is started from inetd. In this case fd 0 will be set to the socket,
5281 but fd 1 will not be set. This also happens for passed SMTP channels. */
5283 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5285 /* Set up the incoming protocol name and the state of the program. Root is
5286 allowed to force received protocol via the -oMr option above. If we have come
5287 via inetd, the process info has already been set up. We don't set
5288 received_protocol here for smtp input, as it varies according to
5289 batch/HELO/EHLO/AUTH/TLS. */
5293 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5294 smtp_batched_input? "batched " : "",
5295 (sender_address!= NULL)? sender_address : originator_login);
5299 int old_pool = store_pool;
5300 store_pool = POOL_PERM;
5301 if (!received_protocol)
5302 received_protocol = string_sprintf("local%s", called_as);
5303 store_pool = old_pool;
5304 set_process_info("accepting a local non-SMTP message from <%s>",
5308 /* Initialize the session_local_queue-only flag (this will be ignored if
5309 mua_wrapper is set) */
5312 session_local_queue_only = queue_only;
5314 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5315 the spool if so configured. On failure, we must not attempt to send an error
5316 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5317 error code is given.) */
5319 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5321 fprintf(stderr, "exim: insufficient disk space\n");
5322 return EXIT_FAILURE;
5325 /* If this is smtp input of any kind, real or batched, handle the start of the
5328 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5329 because a log line has already been written for all its failure exists
5330 (usually "connection refused: <reason>") and writing another one is
5331 unnecessary clutter. */
5337 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5338 if (verify_check_host(&hosts_connection_nolog) == OK)
5339 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5340 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5341 if (!smtp_start_session())
5344 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5348 /* Otherwise, set up the input size limit here. */
5352 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5353 if (expand_string_message)
5354 if (thismessage_size_limit == -1)
5355 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5356 "message_size_limit: %s", expand_string_message);
5358 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5359 "message_size_limit: %s", expand_string_message);
5362 /* Loop for several messages when reading SMTP input. If we fork any child
5363 processes, we don't want to wait for them unless synchronous delivery is
5364 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5365 same as SIG_DFL, despite the fact that documentation often lists the default as
5366 "ignore". This is a confusing area. This is what I know:
5368 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5369 processes that complete simply to go away without ever becoming defunct. You
5370 can't then wait for them - but we don't want to wait for them in the
5371 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5372 happen for all OS (e.g. *BSD is different).
5374 But that's not the end of the story. Some (many? all?) systems have the
5375 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5376 has by default, so it seems that the difference is merely one of default
5377 (compare restarting vs non-restarting signals).
5379 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5380 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5381 of the loop below. Paranoia rules.
5383 February 2003: That's *still* not the end of the story. There are now versions
5384 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5385 process then calls waitpid(), a grumble is written to the system log, because
5386 this is logically inconsistent. In other words, it doesn't like the paranoia.
5387 As a consequence of this, the waitpid() below is now excluded if we are sure
5388 that SIG_IGN works. */
5390 if (!synchronous_delivery)
5393 struct sigaction act;
5394 act.sa_handler = SIG_IGN;
5395 sigemptyset(&(act.sa_mask));
5396 act.sa_flags = SA_NOCLDWAIT;
5397 sigaction(SIGCHLD, &act, NULL);
5399 signal(SIGCHLD, SIG_IGN);
5403 /* Save the current store pool point, for resetting at the start of
5404 each message, and save the real sender address, if any. */
5406 reset_point = store_get(0);
5407 real_sender_address = sender_address;
5409 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5410 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5417 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5418 input and build the recipients list, before calling receive_msg() to read the
5419 message proper. Whatever sender address is given in the SMTP transaction is
5420 often ignored for local senders - we use the actual sender, which is normally
5421 either the underlying user running this process or a -f argument provided by
5422 a trusted caller. It is saved in real_sender_address. The test for whether to
5423 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5428 if ((rc = smtp_setup_msg()) > 0)
5430 if (real_sender_address != NULL &&
5431 !receive_check_set_sender(sender_address))
5433 sender_address = raw_sender = real_sender_address;
5434 sender_address_unrewritten = NULL;
5437 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5438 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5439 the very end. The result of the ACL is ignored (as for other non-SMTP
5440 messages). It is run for its potential side effects. */
5442 if (smtp_batched_input && acl_not_smtp_start != NULL)
5444 uschar *user_msg, *log_msg;
5445 enable_dollar_recipients = TRUE;
5446 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5447 &user_msg, &log_msg);
5448 enable_dollar_recipients = FALSE;
5451 /* Now get the data for the message */
5453 more = receive_msg(extract_recipients);
5454 if (message_id[0] == 0)
5456 cancel_cutthrough_connection(TRUE, US"receive dropped");
5457 if (more) goto moreloop;
5458 smtp_log_no_mail(); /* Log no mail if configured */
5459 exim_exit(EXIT_FAILURE, US"receive toplevel");
5464 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5465 smtp_log_no_mail(); /* Log no mail if configured */
5466 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5470 /* In the non-SMTP case, we have all the information from the command
5471 line, but must process it in case it is in the more general RFC822
5472 format, and in any case, to detect syntax errors. Also, it appears that
5473 the use of comma-separated lists as single arguments is common, so we
5474 had better support them. */
5480 int count = argc - recipients_arg;
5481 uschar **list = argv + recipients_arg;
5483 /* These options cannot be changed dynamically for non-SMTP messages */
5485 active_local_sender_retain = local_sender_retain;
5486 active_local_from_check = local_from_check;
5488 /* Save before any rewriting */
5490 raw_sender = string_copy(sender_address);
5492 /* Loop for each argument */
5494 for (i = 0; i < count; i++)
5496 int start, end, domain;
5498 uschar *s = list[i];
5500 /* Loop for each comma-separated address */
5504 BOOL finished = FALSE;
5506 uschar *ss = parse_find_address_end(s, FALSE);
5508 if (*ss == ',') *ss = 0; else finished = TRUE;
5510 /* Check max recipients - if -t was used, these aren't recipients */
5512 if (recipients_max > 0 && ++rcount > recipients_max &&
5513 !extract_recipients)
5514 if (error_handling == ERRORS_STDERR)
5516 fprintf(stderr, "exim: too many recipients\n");
5517 exim_exit(EXIT_FAILURE, US"main");
5521 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5522 errors_sender_rc : EXIT_FAILURE;
5526 BOOL b = allow_utf8_domains;
5527 allow_utf8_domains = TRUE;
5530 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5533 if (string_is_utf8(recipient))
5534 message_smtputf8 = TRUE;
5536 allow_utf8_domains = b;
5539 if (domain == 0 && !allow_unqualified_recipient)
5542 errmess = US"unqualified recipient address not allowed";
5545 if (recipient == NULL)
5547 if (error_handling == ERRORS_STDERR)
5549 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5550 string_printing(list[i]), errmess);
5551 exim_exit(EXIT_FAILURE, US"main");
5557 eblock.text1 = string_printing(list[i]);
5558 eblock.text2 = errmess;
5560 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5561 errors_sender_rc : EXIT_FAILURE;
5565 receive_add_recipient(recipient, -1);
5568 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5572 /* Show the recipients when debugging */
5577 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5578 if (recipients_list != NULL)
5580 debug_printf("Recipients:\n");
5581 for (i = 0; i < recipients_count; i++)
5582 debug_printf(" %s\n", recipients_list[i].address);
5586 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5587 ignored; rejecting here would just add complication, and it can just as
5588 well be done later. Allow $recipients to be visible in the ACL. */
5590 if (acl_not_smtp_start)
5592 uschar *user_msg, *log_msg;
5593 enable_dollar_recipients = TRUE;
5594 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5595 &user_msg, &log_msg);
5596 enable_dollar_recipients = FALSE;
5599 /* Pause for a while waiting for input. If none received in that time,
5600 close the logfile, if we had one open; then if we wait for a long-running
5601 datasource (months, in one use-case) log rotation will not leave us holding
5604 if (!receive_timeout)
5606 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5609 FD_ZERO(&r); FD_SET(0, &r);
5610 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5613 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5614 will just read the headers for the message, and not write anything onto the
5617 message_ended = END_NOTENDED;
5618 more = receive_msg(extract_recipients);
5620 /* more is always FALSE here (not SMTP message) when reading a message
5621 for real; when reading the headers of a message for filter testing,
5622 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5624 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5625 } /* Non-SMTP message reception */
5627 /* If this is a filter testing run, there are headers in store, but
5628 no message on the spool. Run the filtering code in testing mode, setting
5629 the domain to the qualify domain and the local part to the current user,
5630 unless they have been set by options. The prefix and suffix are left unset
5631 unless specified. The the return path is set to to the sender unless it has
5632 already been set from a return-path header in the message. */
5634 if (filter_test != FTEST_NONE)
5636 deliver_domain = (ftest_domain != NULL)?
5637 ftest_domain : qualify_domain_recipient;
5638 deliver_domain_orig = deliver_domain;
5639 deliver_localpart = (ftest_localpart != NULL)?
5640 ftest_localpart : originator_login;
5641 deliver_localpart_orig = deliver_localpart;
5642 deliver_localpart_prefix = ftest_prefix;
5643 deliver_localpart_suffix = ftest_suffix;
5644 deliver_home = originator_home;
5646 if (return_path == NULL)
5648 printf("Return-path copied from sender\n");
5649 return_path = string_copy(sender_address);
5652 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5653 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5655 receive_add_recipient(
5656 string_sprintf("%s%s%s@%s",
5657 (ftest_prefix == NULL)? US"" : ftest_prefix,
5659 (ftest_suffix == NULL)? US"" : ftest_suffix,
5660 deliver_domain), -1);
5662 printf("Recipient = %s\n", recipients_list[0].address);
5663 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5664 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5666 if (chdir("/")) /* Get away from wherever the user is running this from */
5668 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5669 exim_exit(EXIT_FAILURE, US"main");
5672 /* Now we run either a system filter test, or a user filter test, or both.
5673 In the latter case, headers added by the system filter will persist and be
5674 available to the user filter. We need to copy the filter variables
5677 if ((filter_test & FTEST_SYSTEM) != 0)
5678 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5679 exim_exit(EXIT_FAILURE, US"main");
5681 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5683 if ((filter_test & FTEST_USER) != 0)
5684 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5685 exim_exit(EXIT_FAILURE, US"main");
5687 exim_exit(EXIT_SUCCESS, US"main");
5690 /* Else act on the result of message reception. We should not get here unless
5691 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5692 will be TRUE. If it is not, check on the number of messages received in this
5695 if (!session_local_queue_only &&
5696 smtp_accept_queue_per_connection > 0 &&
5697 receive_messagecount > smtp_accept_queue_per_connection)
5699 session_local_queue_only = TRUE;
5700 queue_only_reason = 2;
5703 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5704 and queue_only_load is set, check that the load average is below it. If it is
5705 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5706 default), we put the whole session into queue_only mode. It then remains this
5707 way for any subsequent messages on the same SMTP connection. This is a
5708 deliberate choice; even though the load average may fall, it doesn't seem
5709 right to deliver later messages on the same call when not delivering earlier
5710 ones. However, there are odd cases where this is not wanted, so this can be
5711 changed by setting queue_only_load_latch false. */
5713 local_queue_only = session_local_queue_only;
5714 if (!local_queue_only && queue_only_load >= 0)
5716 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5717 if (local_queue_only)
5719 queue_only_reason = 3;
5720 if (queue_only_load_latch) session_local_queue_only = TRUE;
5724 /* If running as an MUA wrapper, all queueing options and freezing options
5728 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5730 /* Log the queueing here, when it will get a message id attached, but
5731 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5734 if (local_queue_only)
5736 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5737 switch(queue_only_reason)
5740 log_write(L_delay_delivery,
5741 LOG_MAIN, "no immediate delivery: more than %d messages "
5742 "received in one connection", smtp_accept_queue_per_connection);
5746 log_write(L_delay_delivery,
5747 LOG_MAIN, "no immediate delivery: load average %.2f",
5748 (double)load_average/1000.0);
5753 else if (queue_only_policy || deliver_freeze)
5754 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5756 /* Else do the delivery unless the ACL or local_scan() called for queue only
5757 or froze the message. Always deliver in a separate process. A fork failure is
5758 not a disaster, as the delivery will eventually happen on a subsequent queue
5759 run. The search cache must be tidied before the fork, as the parent will
5760 do it before exiting. The child will trigger a lookup failure and
5761 thereby defer the delivery if it tries to use (for example) a cached ldap
5762 connection that the parent has called unbind on. */
5769 if ((pid = fork()) == 0)
5772 close_unwanted(); /* Close unwanted file descriptors and TLS */
5773 exim_nullstd(); /* Ensure std{in,out,err} exist */
5775 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5776 mode, deliver_drop_privilege is forced TRUE). */
5778 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5780 delivery_re_exec(CEE_EXEC_EXIT);
5781 /* Control does not return here. */
5784 /* No need to re-exec */
5786 rc = deliver_message(message_id, FALSE, FALSE);
5788 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5789 EXIT_SUCCESS : EXIT_FAILURE);
5794 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5795 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5796 "process: %s", strerror(errno));
5800 release_cutthrough_connection(US"msg passed for delivery");
5802 /* In the parent, wait if synchronous delivery is required. This will
5803 always be the case in MUA wrapper mode. */
5805 if (synchronous_delivery)
5808 while (wait(&status) != pid);
5809 if ((status & 0x00ff) != 0)
5810 log_write(0, LOG_MAIN|LOG_PANIC,
5811 "process %d crashed with signal %d while delivering %s",
5812 (int)pid, status & 0x00ff, message_id);
5813 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5818 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5819 automatically reaps children (see comments above the loop), clear away any
5820 finished subprocesses here, in case there are lots of messages coming in
5821 from the same source. */
5823 #ifndef SIG_IGN_WORKS
5824 while (waitpid(-1, NULL, WNOHANG) > 0);
5828 return_path = sender_address = NULL;
5829 authenticated_sender = NULL;
5830 deliver_localpart_orig = NULL;
5831 deliver_domain_orig = NULL;
5832 deliver_host = deliver_host_address = NULL;
5833 dnslist_domain = dnslist_matched = NULL;
5834 #ifdef WITH_CONTENT_SCAN
5835 malware_name = NULL;
5837 callout_address = NULL;
5838 sending_ip_address = NULL;
5840 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5842 store_reset(reset_point);
5845 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5846 return 0; /* To stop compiler warning */