1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
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 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
218 /* If we are already running as the Exim user, try to create it in the
219 current process (assuming spool_directory exists). Otherwise, if we are
220 root, do the creation in an exim:exim subprocess. */
222 int euid = geteuid();
223 if (euid == exim_uid)
224 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
225 else if (euid == root_uid)
226 fd = log_create_as_exim(process_log_path);
229 /* If we are neither exim nor root, or if we failed to create the log file,
230 give up. There is not much useful we can do with errors, since we don't want
231 to disrupt whatever is going on outside the signal handler. */
235 (void)write(fd, process_info, process_info_len);
241 /*************************************************
243 *************************************************/
245 /* This handler is enabled most of the time that Exim is running. The handler
246 doesn't actually get used unless alarm() has been called to set a timer, to
247 place a time limit on a system call of some kind. When the handler is run, it
250 There are some other SIGALRM handlers that are used in special cases when more
251 than just a flag setting is required; for example, when reading a message's
252 input. These are normally set up in the code module that uses them, and the
253 SIGALRM handler is reset to this one afterwards.
255 Argument: the signal value (SIGALRM)
260 sigalrm_handler(int sig)
262 sig = sig; /* Keep picky compilers happy */
264 os_non_restarting_signal(SIGALRM, sigalrm_handler);
269 /*************************************************
270 * Sleep for a fractional time interval *
271 *************************************************/
273 /* This function is called by millisleep() and exim_wait_tick() to wait for a
274 period of time that may include a fraction of a second. The coding is somewhat
275 tedious. We do not expect setitimer() ever to fail, but if it does, the process
276 will wait for ever, so we panic in this instance. (There was a case of this
277 when a bug in a function that calls milliwait() caused it to pass invalid data.
278 That's when I added the check. :-)
280 We assume it to be not worth sleeping for under 100us; this value will
281 require revisiting as hardware advances. This avoids the issue of
282 a zero-valued timer setting meaning "never fire".
284 Argument: an itimerval structure containing the interval
289 milliwait(struct itimerval *itval)
292 sigset_t old_sigmask;
294 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
296 (void)sigemptyset(&sigmask); /* Empty mask */
297 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
298 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
299 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
300 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
301 "setitimer() failed: %s", strerror(errno));
302 (void)sigfillset(&sigmask); /* All signals */
303 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
304 (void)sigsuspend(&sigmask); /* Until SIGALRM */
305 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
311 /*************************************************
312 * Millisecond sleep function *
313 *************************************************/
315 /* The basic sleep() function has a granularity of 1 second, which is too rough
316 in some cases - for example, when using an increasing delay to slow down
319 Argument: number of millseconds
326 struct itimerval itval;
327 itval.it_interval.tv_sec = 0;
328 itval.it_interval.tv_usec = 0;
329 itval.it_value.tv_sec = msec/1000;
330 itval.it_value.tv_usec = (msec % 1000) * 1000;
336 /*************************************************
337 * Compare microsecond times *
338 *************************************************/
345 Returns: -1, 0, or +1
349 exim_tvcmp(struct timeval *t1, struct timeval *t2)
351 if (t1->tv_sec > t2->tv_sec) return +1;
352 if (t1->tv_sec < t2->tv_sec) return -1;
353 if (t1->tv_usec > t2->tv_usec) return +1;
354 if (t1->tv_usec < t2->tv_usec) return -1;
361 /*************************************************
362 * Clock tick wait function *
363 *************************************************/
365 /* Exim uses a time + a pid to generate a unique identifier in two places: its
366 message IDs, and in file names for maildir deliveries. Because some OS now
367 re-use pids within the same second, sub-second times are now being used.
368 However, for absolute certaintly, we must ensure the clock has ticked before
369 allowing the relevant process to complete. At the time of implementation of
370 this code (February 2003), the speed of processors is such that the clock will
371 invariably have ticked already by the time a process has done its job. This
372 function prepares for the time when things are faster - and it also copes with
373 clocks that go backwards.
376 then_tv A timeval which was used to create uniqueness; its usec field
377 has been rounded down to the value of the resolution.
378 We want to be sure the current time is greater than this.
379 resolution The resolution that was used to divide the microseconds
380 (1 for maildir, larger for message ids)
386 exim_wait_tick(struct timeval *then_tv, int resolution)
388 struct timeval now_tv;
389 long int now_true_usec;
391 (void)gettimeofday(&now_tv, NULL);
392 now_true_usec = now_tv.tv_usec;
393 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
395 if (exim_tvcmp(&now_tv, then_tv) <= 0)
397 struct itimerval itval;
398 itval.it_interval.tv_sec = 0;
399 itval.it_interval.tv_usec = 0;
400 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
401 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
403 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
404 negative value for the microseconds is possible only in the case when "now"
405 is more than a second less than "then". That means that itval.it_value.tv_sec
406 is greater than zero. The following correction is therefore safe. */
408 if (itval.it_value.tv_usec < 0)
410 itval.it_value.tv_usec += 1000000;
411 itval.it_value.tv_sec -= 1;
414 DEBUG(D_transport|D_receive)
416 if (!running_in_test_harness)
418 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
419 then_tv->tv_sec, (long) then_tv->tv_usec,
420 now_tv.tv_sec, (long) now_tv.tv_usec);
421 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
422 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
433 /*************************************************
434 * Call fopen() with umask 777 and adjust mode *
435 *************************************************/
437 /* Exim runs with umask(0) so that files created with open() have the mode that
438 is specified in the open() call. However, there are some files, typically in
439 the spool directory, that are created with fopen(). They end up world-writeable
440 if no precautions are taken. Although the spool directory is not accessible to
441 the world, this is an untidiness. So this is a wrapper function for fopen()
442 that sorts out the mode of the created file.
445 filename the file name
446 options the fopen() options
447 mode the required mode
449 Returns: the fopened FILE or NULL
453 modefopen(const uschar *filename, const char *options, mode_t mode)
455 mode_t saved_umask = umask(0777);
456 FILE *f = Ufopen(filename, options);
457 (void)umask(saved_umask);
458 if (f != NULL) (void)fchmod(fileno(f), mode);
465 /*************************************************
466 * Ensure stdin, stdout, and stderr exist *
467 *************************************************/
469 /* Some operating systems grumble if an exec() happens without a standard
470 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
471 file will be opened and will use these fd values, and then some other bit of
472 code will assume, for example, that it can write error messages to stderr.
473 This function ensures that fds 0, 1, and 2 are open if they do not already
474 exist, by connecting them to /dev/null.
476 This function is also used to ensure that std{in,out,err} exist at all times,
477 so that if any library that Exim calls tries to use them, it doesn't crash.
489 for (i = 0; i <= 2; i++)
491 if (fstat(i, &statbuf) < 0 && errno == EBADF)
493 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
494 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
495 string_open_failed(errno, "/dev/null"));
496 if (devnull != i) (void)dup2(devnull, i);
499 if (devnull > 2) (void)close(devnull);
505 /*************************************************
506 * Close unwanted file descriptors for delivery *
507 *************************************************/
509 /* This function is called from a new process that has been forked to deliver
510 an incoming message, either directly, or using exec.
512 We want any smtp input streams to be closed in this new process. However, it
513 has been observed that using fclose() here causes trouble. When reading in -bS
514 input, duplicate copies of messages have been seen. The files will be sharing a
515 file pointer with the parent process, and it seems that fclose() (at least on
516 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
517 least sometimes. Hence we go for closing the underlying file descriptors.
519 If TLS is active, we want to shut down the TLS library, but without molesting
520 the parent's SSL connection.
522 For delivery of a non-SMTP message, we want to close stdin and stdout (and
523 stderr unless debugging) because the calling process might have set them up as
524 pipes and be waiting for them to close before it waits for the submission
525 process to terminate. If they aren't closed, they hold up the calling process
526 until the initial delivery process finishes, which is not what we want.
528 Exception: We do want it for synchronous delivery!
530 And notwithstanding all the above, if D_resolver is set, implying resolver
531 debugging, leave stdout open, because that's where the resolver writes its
534 When we close stderr (which implies we've also closed stdout), we also get rid
535 of any controlling terminal.
547 tls_close(TRUE, FALSE); /* Shut down the TLS library */
549 (void)close(fileno(smtp_in));
550 (void)close(fileno(smtp_out));
555 (void)close(0); /* stdin */
556 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
557 if (debug_selector == 0) /* stderr */
559 if (!synchronous_delivery)
572 /*************************************************
574 *************************************************/
576 /* This function sets a new uid and gid permanently, optionally calling
577 initgroups() to set auxiliary groups. There are some special cases when running
578 Exim in unprivileged modes. In these situations the effective uid will not be
579 root; if we already have the right effective uid/gid, and don't need to
580 initialize any groups, leave things as they are.
585 igflag TRUE if initgroups() wanted
586 msg text to use in debugging output and failure log
588 Returns: nothing; bombs out on failure
592 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
594 uid_t euid = geteuid();
595 gid_t egid = getegid();
597 if (euid == root_uid || euid != uid || egid != gid || igflag)
599 /* At least one OS returns +1 for initgroups failure, so just check for
604 struct passwd *pw = getpwuid(uid);
607 if (initgroups(pw->pw_name, gid) != 0)
608 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
609 (long int)uid, strerror(errno));
611 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
612 "no passwd entry for uid=%ld", (long int)uid);
615 if (setgid(gid) < 0 || setuid(uid) < 0)
617 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
618 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
622 /* Debugging output included uid/gid and all groups */
626 int group_count, save_errno;
627 gid_t group_list[NGROUPS_MAX];
628 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
629 (long int)geteuid(), (long int)getegid(), (long int)getpid());
630 group_count = getgroups(NGROUPS_MAX, group_list);
632 debug_printf(" auxiliary group list:");
636 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
638 else if (group_count < 0)
639 debug_printf(" <error: %s>", strerror(save_errno));
640 else debug_printf(" <none>");
648 /*************************************************
650 *************************************************/
652 /* Exim exits via this function so that it always clears up any open
658 Returns: does not return
666 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
667 ">>>>>>>>>>>>>>>>\n", (int)getpid(), 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");
844 fprintf(f, " TCP_Fast_Open");
846 #ifdef EXPERIMENTAL_LMDB
847 fprintf(f, " Experimental_LMDB");
849 #ifdef EXPERIMENTAL_QUEUEFILE
850 fprintf(f, " Experimental_QUEUEFILE");
852 #ifdef EXPERIMENTAL_SPF
853 fprintf(f, " Experimental_SPF");
855 #ifdef EXPERIMENTAL_SRS
856 fprintf(f, " Experimental_SRS");
858 #ifdef EXPERIMENTAL_BRIGHTMAIL
859 fprintf(f, " Experimental_Brightmail");
861 #ifdef EXPERIMENTAL_DANE
862 fprintf(f, " Experimental_DANE");
864 #ifdef EXPERIMENTAL_DCC
865 fprintf(f, " Experimental_DCC");
867 #ifdef EXPERIMENTAL_DMARC
868 fprintf(f, " Experimental_DMARC");
870 #ifdef EXPERIMENTAL_DSN_INFO
871 fprintf(f, " Experimental_DSN_info");
875 fprintf(f, "Lookups (built-in):");
876 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
877 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
879 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
882 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
883 fprintf(f, " dbm dbmjz dbmnz");
885 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
886 fprintf(f, " dnsdb");
888 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
889 fprintf(f, " dsearch");
891 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
892 fprintf(f, " ibase");
894 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
895 fprintf(f, " ldap ldapdn ldapm");
897 #ifdef EXPERIMENTAL_LMDB
900 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
901 fprintf(f, " mysql");
903 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
904 fprintf(f, " nis nis0");
906 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
907 fprintf(f, " nisplus");
909 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
910 fprintf(f, " oracle");
912 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
913 fprintf(f, " passwd");
915 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
916 fprintf(f, " pgsql");
918 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
919 fprintf(f, " redis");
921 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
922 fprintf(f, " sqlite");
924 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
925 fprintf(f, " testdb");
927 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
928 fprintf(f, " whoson");
932 fprintf(f, "Authenticators:");
934 fprintf(f, " cram_md5");
936 #ifdef AUTH_CYRUS_SASL
937 fprintf(f, " cyrus_sasl");
940 fprintf(f, " dovecot");
943 fprintf(f, " gsasl");
945 #ifdef AUTH_HEIMDAL_GSSAPI
946 fprintf(f, " heimdal_gssapi");
948 #ifdef AUTH_PLAINTEXT
949 fprintf(f, " plaintext");
959 fprintf(f, "Routers:");
961 fprintf(f, " accept");
963 #ifdef ROUTER_DNSLOOKUP
964 fprintf(f, " dnslookup");
966 #ifdef ROUTER_IPLITERAL
967 fprintf(f, " ipliteral");
969 #ifdef ROUTER_IPLOOKUP
970 fprintf(f, " iplookup");
972 #ifdef ROUTER_MANUALROUTE
973 fprintf(f, " manualroute");
975 #ifdef ROUTER_QUERYPROGRAM
976 fprintf(f, " queryprogram");
978 #ifdef ROUTER_REDIRECT
979 fprintf(f, " redirect");
983 fprintf(f, "Transports:");
984 #ifdef TRANSPORT_APPENDFILE
985 fprintf(f, " appendfile");
986 #ifdef SUPPORT_MAILDIR
987 fprintf(f, "/maildir");
989 #ifdef SUPPORT_MAILSTORE
990 fprintf(f, "/mailstore");
996 #ifdef TRANSPORT_AUTOREPLY
997 fprintf(f, " autoreply");
999 #ifdef TRANSPORT_LMTP
1000 fprintf(f, " lmtp");
1002 #ifdef TRANSPORT_PIPE
1003 fprintf(f, " pipe");
1005 #ifdef EXPERIMENTAL_QUEUEFILE
1006 fprintf(f, " queuefile");
1008 #ifdef TRANSPORT_SMTP
1009 fprintf(f, " smtp");
1013 if (fixed_never_users[0] > 0)
1016 fprintf(f, "Fixed never_users: ");
1017 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1018 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1019 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1022 fprintf(f, "Configure owner: %d:%d\n", config_uid, config_gid);
1024 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1026 /* Everything else is details which are only worth reporting when debugging.
1027 Perhaps the tls_version_report should move into this too. */
1032 /* clang defines __GNUC__ (at least, for me) so test for it first */
1033 #if defined(__clang__)
1034 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1035 #elif defined(__GNUC__)
1036 fprintf(f, "Compiler: GCC [%s]\n",
1040 "? unknown version ?"
1044 fprintf(f, "Compiler: <unknown>\n");
1048 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1049 __GLIBC__, __GLIBC_MINOR__);
1050 if (__GLIBC_PREREQ(2, 1))
1051 fprintf(f, " Runtime: %s\n",
1052 gnu_get_libc_version());
1056 tls_version_report(f);
1059 utf8_version_report(f);
1062 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1063 if (authi->version_report)
1064 (*authi->version_report)(f);
1066 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1067 characters; unless it's an ancient version of PCRE in which case it
1069 #ifndef PCRE_PRERELEASE
1070 # define PCRE_PRERELEASE
1073 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1074 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1076 PCRE_MAJOR, PCRE_MINOR,
1077 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1080 #undef EXPAND_AND_QUOTE
1083 for (i = 0; i < lookup_list_count; i++)
1084 if (lookup_list[i]->version_report)
1085 lookup_list[i]->version_report(f);
1087 #ifdef WHITELIST_D_MACROS
1088 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1090 fprintf(f, "WHITELIST_D_MACROS unset\n");
1092 #ifdef TRUSTED_CONFIG_LIST
1093 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1095 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1102 /*************************************************
1103 * Show auxiliary information about Exim *
1104 *************************************************/
1107 show_exim_information(enum commandline_info request, FILE *stream)
1114 fprintf(stream, "Oops, something went wrong.\n");
1118 "The -bI: flag takes a string indicating which information to provide.\n"
1119 "If the string is not recognised, you'll get this help (on stderr).\n"
1121 " exim -bI:help this information\n"
1122 " exim -bI:dscp dscp value keywords known\n"
1123 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1127 for (pp = exim_sieve_extension_list; *pp; ++pp)
1128 fprintf(stream, "%s\n", *pp);
1131 dscp_list_to_stream(stream);
1137 /*************************************************
1138 * Quote a local part *
1139 *************************************************/
1141 /* This function is used when a sender address or a From: or Sender: header
1142 line is being created from the caller's login, or from an authenticated_id. It
1143 applies appropriate quoting rules for a local part.
1145 Argument: the local part
1146 Returns: the local part, quoted if necessary
1150 local_part_quote(uschar *lpart)
1152 BOOL needs_quote = FALSE;
1157 for (t = lpart; !needs_quote && *t != 0; t++)
1159 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1160 (*t != '.' || t == lpart || t[1] == 0);
1163 if (!needs_quote) return lpart;
1166 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1170 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1173 yield = string_cat(yield, &size, &ptr, lpart);
1176 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1177 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1178 yield = string_catn(yield, &size, &ptr, nq, 1);
1182 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1190 /*************************************************
1191 * Load readline() functions *
1192 *************************************************/
1194 /* This function is called from testing executions that read data from stdin,
1195 but only when running as the calling user. Currently, only -be does this. The
1196 function loads the readline() function library and passes back the functions.
1197 On some systems, it needs the curses library, so load that too, but try without
1198 it if loading fails. All this functionality has to be requested at build time.
1201 fn_readline_ptr pointer to where to put the readline pointer
1202 fn_addhist_ptr pointer to where to put the addhistory function
1204 Returns: the dlopen handle or NULL on failure
1208 set_readline(char * (**fn_readline_ptr)(const char *),
1209 void (**fn_addhist_ptr)(const char *))
1212 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1214 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1215 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1217 if (dlhandle != NULL)
1219 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1220 * char * readline (const char *prompt);
1221 * void add_history (const char *string);
1223 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1224 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1228 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1237 /*************************************************
1238 * Get a line from stdin for testing things *
1239 *************************************************/
1241 /* This function is called when running tests that can take a number of lines
1242 of input (for example, -be and -bt). It handles continuations and trailing
1243 spaces. And prompting and a blank line output on eof. If readline() is in use,
1244 the arguments are non-NULL and provide the relevant functions.
1247 fn_readline readline function or NULL
1248 fn_addhist addhist function or NULL
1250 Returns: pointer to dynamic memory, or NULL at end of file
1254 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1259 uschar *yield = NULL;
1261 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1265 uschar buffer[1024];
1269 char *readline_line = NULL;
1270 if (fn_readline != NULL)
1272 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1273 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1274 p = US readline_line;
1279 /* readline() not in use */
1282 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1286 /* Handle the line */
1288 ss = p + (int)Ustrlen(p);
1289 while (ss > p && isspace(ss[-1])) ss--;
1293 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1296 yield = string_catn(yield, &size, &ptr, p, ss - p);
1299 if (fn_readline != NULL) free(readline_line);
1302 /* yield can only be NULL if ss==p */
1303 if (ss == p || yield[ptr-1] != '\\')
1305 if (yield) yield[ptr] = 0;
1311 if (yield == NULL) printf("\n");
1317 /*************************************************
1318 * Output usage information for the program *
1319 *************************************************/
1321 /* This function is called when there are no recipients
1322 or a specific --help argument was added.
1325 progname information on what name we were called by
1327 Returns: DOES NOT RETURN
1331 exim_usage(uschar *progname)
1334 /* Handle specific program invocation varients */
1335 if (Ustrcmp(progname, US"-mailq") == 0)
1338 "mailq - list the contents of the mail queue\n\n"
1339 "For a list of options, see the Exim documentation.\n");
1343 /* Generic usage - we output this whatever happens */
1345 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1346 "not directly from a shell command line. Options and/or arguments control\n"
1347 "what it does when called. For a list of options, see the Exim documentation.\n");
1354 /*************************************************
1355 * Validate that the macros given are okay *
1356 *************************************************/
1358 /* Typically, Exim will drop privileges if macros are supplied. In some
1359 cases, we want to not do so.
1361 Arguments: opt_D_used - true if the commandline had a "-D" option
1362 Returns: true if trusted, false otherwise
1366 macros_trusted(BOOL opt_D_used)
1368 #ifdef WHITELIST_D_MACROS
1370 uschar *whitelisted, *end, *p, **whites, **w;
1371 int white_count, i, n;
1373 BOOL prev_char_item, found;
1378 #ifndef WHITELIST_D_MACROS
1382 /* We only trust -D overrides for some invoking users:
1383 root, the exim run-time user, the optional config owner user.
1384 I don't know why config-owner would be needed, but since they can own the
1385 config files anyway, there's no security risk to letting them override -D. */
1386 if ( ! ((real_uid == root_uid)
1387 || (real_uid == exim_uid)
1388 #ifdef CONFIGURE_OWNER
1389 || (real_uid == config_uid)
1393 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1397 /* Get a list of macros which are whitelisted */
1398 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1399 prev_char_item = FALSE;
1401 for (p = whitelisted; *p != '\0'; ++p)
1403 if (*p == ':' || isspace(*p))
1408 prev_char_item = FALSE;
1411 if (!prev_char_item)
1412 prev_char_item = TRUE;
1419 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1420 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1425 if (i == white_count)
1427 while (*p != '\0' && p < end)
1433 /* The list of commandline macros should be very short.
1434 Accept the N*M complexity. */
1435 for (m = macros; m; m = m->next) if (m->command_line)
1438 for (w = whites; *w; ++w)
1439 if (Ustrcmp(*w, m->name) == 0)
1446 if (m->replacement == NULL)
1448 len = Ustrlen(m->replacement);
1451 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1452 0, PCRE_EOPT, NULL, 0);
1455 if (n != PCRE_ERROR_NOMATCH)
1456 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1460 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1466 /*************************************************
1467 * Entry point and high-level code *
1468 *************************************************/
1470 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1471 the appropriate action. All the necessary functions are present in the one
1472 binary. I originally thought one should split it up, but it turns out that so
1473 much of the apparatus is needed in each chunk that one might as well just have
1474 it all available all the time, which then makes the coding easier as well.
1477 argc count of entries in argv
1478 argv argument strings, with argv[0] being the program name
1480 Returns: EXIT_SUCCESS if terminated successfully
1481 EXIT_FAILURE otherwise, except when a message has been sent
1482 to the sender, and -oee was given
1486 main(int argc, char **cargv)
1488 uschar **argv = USS cargv;
1489 int arg_receive_timeout = -1;
1490 int arg_smtp_receive_timeout = -1;
1491 int arg_error_handling = error_handling;
1492 int filter_sfd = -1;
1493 int filter_ufd = -1;
1496 int list_queue_option = 0;
1498 int msg_action_arg = -1;
1499 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1500 int queue_only_reason = 0;
1502 int perl_start_option = 0;
1504 int recipients_arg = argc;
1505 int sender_address_domain = 0;
1506 int test_retry_arg = -1;
1507 int test_rewrite_arg = -1;
1508 BOOL arg_queue_only = FALSE;
1509 BOOL bi_option = FALSE;
1510 BOOL checking = FALSE;
1511 BOOL count_queue = FALSE;
1512 BOOL expansion_test = FALSE;
1513 BOOL extract_recipients = FALSE;
1514 BOOL flag_G = FALSE;
1515 BOOL flag_n = FALSE;
1516 BOOL forced_delivery = FALSE;
1517 BOOL f_end_dot = FALSE;
1518 BOOL deliver_give_up = FALSE;
1519 BOOL list_queue = FALSE;
1520 BOOL list_options = FALSE;
1521 BOOL list_config = FALSE;
1522 BOOL local_queue_only;
1524 BOOL one_msg_action = FALSE;
1525 BOOL opt_D_used = FALSE;
1526 BOOL queue_only_set = FALSE;
1527 BOOL receiving_message = TRUE;
1528 BOOL sender_ident_set = FALSE;
1529 BOOL session_local_queue_only;
1531 BOOL removed_privilege = FALSE;
1532 BOOL usage_wanted = FALSE;
1533 BOOL verify_address_mode = FALSE;
1534 BOOL verify_as_sender = FALSE;
1535 BOOL version_printed = FALSE;
1536 uschar *alias_arg = NULL;
1537 uschar *called_as = US"";
1538 uschar *cmdline_syslog_name = NULL;
1539 uschar *start_queue_run_id = NULL;
1540 uschar *stop_queue_run_id = NULL;
1541 uschar *expansion_test_message = NULL;
1542 uschar *ftest_domain = NULL;
1543 uschar *ftest_localpart = NULL;
1544 uschar *ftest_prefix = NULL;
1545 uschar *ftest_suffix = NULL;
1546 uschar *log_oneline = NULL;
1547 uschar *malware_test_file = NULL;
1548 uschar *real_sender_address;
1549 uschar *originator_home = US"/";
1554 struct stat statbuf;
1555 pid_t passed_qr_pid = (pid_t)0;
1556 int passed_qr_pipe = -1;
1557 gid_t group_list[NGROUPS_MAX];
1559 /* For the -bI: flag */
1560 enum commandline_info info_flag = CMDINFO_NONE;
1561 BOOL info_stdout = FALSE;
1563 /* Possible options for -R and -S */
1565 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1567 /* Need to define this in case we need to change the environment in order
1568 to get rid of a bogus time zone. We have to make it char rather than uschar
1569 because some OS define it in /usr/include/unistd.h. */
1571 extern char **environ;
1573 /* If the Exim user and/or group and/or the configuration file owner/group were
1574 defined by ref:name at build time, we must now find the actual uid/gid values.
1575 This is a feature to make the lives of binary distributors easier. */
1577 #ifdef EXIM_USERNAME
1578 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1582 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1586 /* If ref:name uses a number as the name, route_finduser() returns
1587 TRUE with exim_uid set and pw coerced to NULL. */
1589 exim_gid = pw->pw_gid;
1590 #ifndef EXIM_GROUPNAME
1594 "exim: ref:name should specify a usercode, not a group.\n"
1595 "exim: can't let you get away with it unless you also specify a group.\n");
1602 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1608 #ifdef EXIM_GROUPNAME
1609 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1611 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1617 #ifdef CONFIGURE_OWNERNAME
1618 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1620 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1621 CONFIGURE_OWNERNAME);
1626 /* We default the system_filter_user to be the Exim run-time user, as a
1627 sane non-root value. */
1628 system_filter_uid = exim_uid;
1630 #ifdef CONFIGURE_GROUPNAME
1631 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1633 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1634 CONFIGURE_GROUPNAME);
1639 /* In the Cygwin environment, some initialization used to need doing.
1640 It was fudged in by means of this macro; now no longer but we'll leave
1641 it in case of others. */
1647 /* Check a field which is patched when we are running Exim within its
1648 testing harness; do a fast initial check, and then the whole thing. */
1650 running_in_test_harness =
1651 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1653 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1654 at the start of a program; however, it seems that some environments do not
1655 follow this. A "strange" locale can affect the formatting of timestamps, so we
1658 setlocale(LC_ALL, "C");
1660 /* Set up the default handler for timing using alarm(). */
1662 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1664 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1665 because store_malloc writes a log entry on failure. */
1667 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1669 fprintf(stderr, "exim: failed to get store for log buffer\n");
1673 /* Initialize the default log options. */
1675 bits_set(log_selector, log_selector_size, log_default);
1677 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1678 NULL when the daemon is run and the file is closed. We have to use this
1679 indirection, because some systems don't allow writing to the variable "stderr".
1682 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1684 /* Arrange for the PCRE regex library to use our store functions. Note that
1685 the normal calls are actually macros that add additional arguments for
1686 debugging purposes so we have to assign specially constructed functions here.
1687 The default is to use store in the stacking pool, but this is overridden in the
1688 regex_must_compile() function. */
1690 pcre_malloc = function_store_get;
1691 pcre_free = function_dummy_free;
1693 /* Ensure there is a big buffer for temporary use in several places. It is put
1694 in malloc store so that it can be freed for enlargement if necessary. */
1696 big_buffer = store_malloc(big_buffer_size);
1698 /* Set up the handler for the data request signal, and set the initial
1699 descriptive text. */
1701 set_process_info("initializing");
1702 os_restarting_signal(SIGUSR1, usr1_handler);
1704 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1705 in the daemon code. For the rest of Exim's uses, we ignore it. */
1707 signal(SIGHUP, SIG_IGN);
1709 /* We don't want to die on pipe errors as the code is written to handle
1710 the write error instead. */
1712 signal(SIGPIPE, SIG_IGN);
1714 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1715 set to SIG_IGN. This causes subprocesses that complete before the parent
1716 process waits for them not to hang around, so when Exim calls wait(), nothing
1717 is there. The wait() code has been made robust against this, but let's ensure
1718 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1719 ending status. We use sigaction rather than plain signal() on those OS where
1720 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1721 problem on AIX with this.) */
1725 struct sigaction act;
1726 act.sa_handler = SIG_DFL;
1727 sigemptyset(&(act.sa_mask));
1729 sigaction(SIGCHLD, &act, NULL);
1732 signal(SIGCHLD, SIG_DFL);
1735 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1740 /* Set up the version number. Set up the leading 'E' for the external form of
1741 message ids, set the pointer to the internal form, and initialize it to
1742 indicate no message being processed. */
1745 message_id_option[0] = '-';
1746 message_id_external = message_id_option + 1;
1747 message_id_external[0] = 'E';
1748 message_id = message_id_external + 1;
1751 /* Set the umask to zero so that any files Exim creates using open() are
1752 created with the modes that it specifies. NOTE: Files created with fopen() have
1753 a problem, which was not recognized till rather late (February 2006). With this
1754 umask, such files will be world writeable. (They are all content scanning files
1755 in the spool directory, which isn't world-accessible, so this is not a
1756 disaster, but it's untidy.) I don't want to change this overall setting,
1757 however, because it will interact badly with the open() calls. Instead, there's
1758 now a function called modefopen() that fiddles with the umask while calling
1763 /* Precompile the regular expression for matching a message id. Keep this in
1764 step with the code that generates ids in the accept.c module. We need to do
1765 this here, because the -M options check their arguments for syntactic validity
1766 using mac_ismsgid, which uses this. */
1769 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1771 /* Precompile the regular expression that is used for matching an SMTP error
1772 code, possibly extended, at the start of an error message. Note that the
1773 terminating whitespace character is included. */
1776 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1779 #ifdef WHITELIST_D_MACROS
1780 /* Precompile the regular expression used to filter the content of macros
1781 given to -D for permissibility. */
1783 regex_whitelisted_macro =
1784 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1787 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1789 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1790 this seems to be a generally accepted convention, since one finds symbolic
1791 links called "mailq" in standard OS configurations. */
1793 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1794 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1797 receiving_message = FALSE;
1798 called_as = US"-mailq";
1801 /* If the program is called as "rmail" treat it as equivalent to
1802 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1803 i.e. preventing a single dot on a line from terminating the message, and
1804 returning with zero return code, even in cases of error (provided an error
1805 message has been sent). */
1807 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1808 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1811 called_as = US"-rmail";
1812 errors_sender_rc = EXIT_SUCCESS;
1815 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1816 this is a smail convention. */
1818 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1819 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1821 smtp_input = smtp_batched_input = TRUE;
1822 called_as = US"-rsmtp";
1825 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1826 this is a smail convention. */
1828 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1829 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1832 receiving_message = FALSE;
1833 called_as = US"-runq";
1836 /* If the program is called as "newaliases" treat it as equivalent to
1837 "exim -bi"; this is a sendmail convention. */
1839 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1840 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1843 receiving_message = FALSE;
1844 called_as = US"-newaliases";
1847 /* Save the original effective uid for a couple of uses later. It should
1848 normally be root, but in some esoteric environments it may not be. */
1850 original_euid = geteuid();
1852 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1853 to be the same as the real ones. This makes a difference only if Exim is setuid
1854 (or setgid) to something other than root, which could be the case in some
1855 special configurations. */
1857 real_uid = getuid();
1858 real_gid = getgid();
1860 if (real_uid == root_uid)
1862 rv = setgid(real_gid);
1865 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1866 (long int)real_gid, strerror(errno));
1869 rv = setuid(real_uid);
1872 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1873 (long int)real_uid, strerror(errno));
1878 /* If neither the original real uid nor the original euid was root, Exim is
1879 running in an unprivileged state. */
1881 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1883 /* Scan the program's arguments. Some can be dealt with right away; others are
1884 simply recorded for checking and handling afterwards. Do a high-level switch
1885 on the second character (the one after '-'), to save some effort. */
1887 for (i = 1; i < argc; i++)
1889 BOOL badarg = FALSE;
1890 uschar *arg = argv[i];
1894 /* An argument not starting with '-' is the start of a recipients list;
1895 break out of the options-scanning loop. */
1903 /* An option consistion of -- terminates the options */
1905 if (Ustrcmp(arg, "--") == 0)
1907 recipients_arg = i + 1;
1911 /* Handle flagged options */
1913 switchchar = arg[1];
1916 /* Make all -ex options synonymous with -oex arguments, since that
1917 is assumed by various callers. Also make -qR options synonymous with -R
1918 options, as that seems to be required as well. Allow for -qqR too, and
1919 the same for -S options. */
1921 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1922 Ustrncmp(arg+1, "qR", 2) == 0 ||
1923 Ustrncmp(arg+1, "qS", 2) == 0)
1925 switchchar = arg[2];
1928 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1930 switchchar = arg[3];
1932 queue_2stage = TRUE;
1935 /* Make -r synonymous with -f, since it is a documented alias */
1937 else if (arg[1] == 'r') switchchar = 'f';
1939 /* Make -ov synonymous with -v */
1941 else if (Ustrcmp(arg, "-ov") == 0)
1947 /* deal with --option_aliases */
1948 else if (switchchar == '-')
1950 if (Ustrcmp(argrest, "help") == 0)
1952 usage_wanted = TRUE;
1955 else if (Ustrcmp(argrest, "version") == 0)
1962 /* High-level switch on active initial letter */
1967 /* sendmail uses -Ac and -Am to control which .cf file is used;
1970 if (*argrest == '\0') { badarg = TRUE; break; }
1973 BOOL ignore = FALSE;
1978 if (*(argrest + 1) == '\0')
1982 if (!ignore) { badarg = TRUE; break; }
1986 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1987 so has no need of it. */
1990 if (*argrest == 0) i++; /* Skip over the type */
1995 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1997 /* -bd: Run in daemon mode, awaiting SMTP connections.
1998 -bdf: Ditto, but in the foreground.
2001 if (*argrest == 'd')
2003 daemon_listen = TRUE;
2004 if (*(++argrest) == 'f') background_daemon = FALSE;
2005 else if (*argrest != 0) { badarg = TRUE; break; }
2008 /* -be: Run in expansion test mode
2009 -bem: Ditto, but read a message from a file first
2012 else if (*argrest == 'e')
2014 expansion_test = checking = TRUE;
2015 if (argrest[1] == 'm')
2017 if (++i >= argc) { badarg = TRUE; break; }
2018 expansion_test_message = argv[i];
2021 if (argrest[1] != 0) { badarg = TRUE; break; }
2024 /* -bF: Run system filter test */
2026 else if (*argrest == 'F')
2028 filter_test |= checking = FTEST_SYSTEM;
2029 if (*(++argrest) != 0) { badarg = TRUE; break; }
2030 if (++i < argc) filter_test_sfile = argv[i]; else
2032 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2037 /* -bf: Run user filter test
2038 -bfd: Set domain for filter testing
2039 -bfl: Set local part for filter testing
2040 -bfp: Set prefix for filter testing
2041 -bfs: Set suffix for filter testing
2044 else if (*argrest == 'f')
2046 if (*(++argrest) == 0)
2048 filter_test |= checking = FTEST_USER;
2049 if (++i < argc) filter_test_ufile = argv[i]; else
2051 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2059 fprintf(stderr, "exim: string expected after %s\n", arg);
2062 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2063 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2064 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2065 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2066 else { badarg = TRUE; break; }
2070 /* -bh: Host checking - an IP address must follow. */
2072 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2074 if (++i >= argc) { badarg = TRUE; break; }
2075 sender_host_address = argv[i];
2076 host_checking = checking = log_testing_mode = TRUE;
2077 host_checking_callout = argrest[1] == 'c';
2078 message_logs = FALSE;
2081 /* -bi: This option is used by sendmail to initialize *the* alias file,
2082 though it has the -oA option to specify a different file. Exim has no
2083 concept of *the* alias file, but since Sun's YP make script calls
2084 sendmail this way, some support must be provided. */
2086 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2088 /* -bI: provide information, of the type to follow after a colon.
2089 This is an Exim flag. */
2091 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2093 uschar *p = &argrest[2];
2094 info_flag = CMDINFO_HELP;
2097 if (strcmpic(p, CUS"sieve") == 0)
2099 info_flag = CMDINFO_SIEVE;
2102 else if (strcmpic(p, CUS"dscp") == 0)
2104 info_flag = CMDINFO_DSCP;
2107 else if (strcmpic(p, CUS"help") == 0)
2114 /* -bm: Accept and deliver message - the default option. Reinstate
2115 receiving_message, which got turned off for all -b options. */
2117 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2119 /* -bmalware: test the filename given for malware */
2121 else if (Ustrcmp(argrest, "malware") == 0)
2123 if (++i >= argc) { badarg = TRUE; break; }
2125 malware_test_file = argv[i];
2128 /* -bnq: For locally originating messages, do not qualify unqualified
2129 addresses. In the envelope, this causes errors; in header lines they
2132 else if (Ustrcmp(argrest, "nq") == 0)
2134 allow_unqualified_sender = FALSE;
2135 allow_unqualified_recipient = FALSE;
2138 /* -bpxx: List the contents of the mail queue, in various forms. If
2139 the option is -bpc, just a queue count is needed. Otherwise, if the
2140 first letter after p is r, then order is random. */
2142 else if (*argrest == 'p')
2144 if (*(++argrest) == 'c')
2147 if (*(++argrest) != 0) badarg = TRUE;
2151 if (*argrest == 'r')
2153 list_queue_option = 8;
2156 else list_queue_option = 0;
2160 /* -bp: List the contents of the mail queue, top-level only */
2162 if (*argrest == 0) {}
2164 /* -bpu: List the contents of the mail queue, top-level undelivered */
2166 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2168 /* -bpa: List the contents of the mail queue, including all delivered */
2170 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2172 /* Unknown after -bp[r] */
2182 /* -bP: List the configuration variables given as the address list.
2183 Force -v, so configuration errors get displayed. */
2185 else if (Ustrcmp(argrest, "P") == 0)
2187 /* -bP config: we need to setup here, because later,
2188 * when list_options is checked, the config is read already */
2189 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2192 readconf_save_config(version_string);
2196 list_options = TRUE;
2197 debug_selector |= D_v;
2198 debug_file = stderr;
2202 /* -brt: Test retry configuration lookup */
2204 else if (Ustrcmp(argrest, "rt") == 0)
2207 test_retry_arg = i + 1;
2211 /* -brw: Test rewrite configuration */
2213 else if (Ustrcmp(argrest, "rw") == 0)
2216 test_rewrite_arg = i + 1;
2220 /* -bS: Read SMTP commands on standard input, but produce no replies -
2221 all errors are reported by sending messages. */
2223 else if (Ustrcmp(argrest, "S") == 0)
2224 smtp_input = smtp_batched_input = receiving_message = TRUE;
2226 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2227 on standard output. */
2229 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2231 /* -bt: address testing mode */
2233 else if (Ustrcmp(argrest, "t") == 0)
2234 address_test_mode = checking = log_testing_mode = TRUE;
2236 /* -bv: verify addresses */
2238 else if (Ustrcmp(argrest, "v") == 0)
2239 verify_address_mode = checking = log_testing_mode = TRUE;
2241 /* -bvs: verify sender addresses */
2243 else if (Ustrcmp(argrest, "vs") == 0)
2245 verify_address_mode = checking = log_testing_mode = TRUE;
2246 verify_as_sender = TRUE;
2249 /* -bV: Print version string and support details */
2251 else if (Ustrcmp(argrest, "V") == 0)
2253 printf("Exim version %s #%s built %s\n", version_string,
2254 version_cnumber, version_date);
2255 printf("%s\n", CS version_copyright);
2256 version_printed = TRUE;
2257 show_whats_supported(stdout);
2258 log_testing_mode = TRUE;
2261 /* -bw: inetd wait mode, accept a listening socket as stdin */
2263 else if (*argrest == 'w')
2265 inetd_wait_mode = TRUE;
2266 background_daemon = FALSE;
2267 daemon_listen = TRUE;
2268 if (*(++argrest) != '\0')
2270 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2271 if (inetd_wait_timeout <= 0)
2273 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2283 /* -C: change configuration file list; ignore if it isn't really
2284 a change! Enforce a prefix check if required. */
2289 if(++i < argc) argrest = argv[i]; else
2290 { badarg = TRUE; break; }
2292 if (Ustrcmp(config_main_filelist, argrest) != 0)
2294 #ifdef ALT_CONFIG_PREFIX
2296 int len = Ustrlen(ALT_CONFIG_PREFIX);
2297 uschar *list = argrest;
2299 while((filename = string_nextinlist(&list, &sep, big_buffer,
2300 big_buffer_size)) != NULL)
2302 if ((Ustrlen(filename) < len ||
2303 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2304 Ustrstr(filename, "/../") != NULL) &&
2305 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2307 fprintf(stderr, "-C Permission denied\n");
2312 if (real_uid != root_uid)
2314 #ifdef TRUSTED_CONFIG_LIST
2316 if (real_uid != exim_uid
2317 #ifdef CONFIGURE_OWNER
2318 && real_uid != config_uid
2321 trusted_config = FALSE;
2324 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2327 struct stat statbuf;
2329 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2330 (statbuf.st_uid != root_uid /* owner not root */
2331 #ifdef CONFIGURE_OWNER
2332 && statbuf.st_uid != config_uid /* owner not the special one */
2335 (statbuf.st_gid != root_gid /* group not root */
2336 #ifdef CONFIGURE_GROUP
2337 && statbuf.st_gid != config_gid /* group not the special one */
2339 && (statbuf.st_mode & 020) != 0 /* group writeable */
2341 (statbuf.st_mode & 2) != 0) /* world writeable */
2343 trusted_config = FALSE;
2348 /* Well, the trust list at least is up to scratch... */
2349 void *reset_point = store_get(0);
2350 uschar *trusted_configs[32];
2354 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2356 uschar *start = big_buffer, *nl;
2357 while (*start && isspace(*start))
2361 nl = Ustrchr(start, '\n');
2364 trusted_configs[nr_configs++] = string_copy(start);
2365 if (nr_configs == 32)
2373 const uschar *list = argrest;
2375 while (trusted_config && (filename = string_nextinlist(&list,
2376 &sep, big_buffer, big_buffer_size)) != NULL)
2378 for (i=0; i < nr_configs; i++)
2380 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2383 if (i == nr_configs)
2385 trusted_config = FALSE;
2389 store_reset(reset_point);
2393 /* No valid prefixes found in trust_list file. */
2394 trusted_config = FALSE;
2400 /* Could not open trust_list file. */
2401 trusted_config = FALSE;
2405 /* Not root; don't trust config */
2406 trusted_config = FALSE;
2410 config_main_filelist = argrest;
2411 config_changed = TRUE;
2416 /* -D: set up a macro definition */
2419 #ifdef DISABLE_D_OPTION
2420 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2427 uschar *s = argrest;
2430 while (isspace(*s)) s++;
2432 if (*s < 'A' || *s > 'Z')
2434 fprintf(stderr, "exim: macro name set by -D must start with "
2435 "an upper case letter\n");
2439 while (isalnum(*s) || *s == '_')
2441 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2445 if (ptr == 0) { badarg = TRUE; break; }
2446 while (isspace(*s)) s++;
2449 if (*s++ != '=') { badarg = TRUE; break; }
2450 while (isspace(*s)) s++;
2453 for (m = macros; m; m = m->next)
2454 if (Ustrcmp(m->name, name) == 0)
2456 fprintf(stderr, "exim: duplicated -D in command line\n");
2460 m = macro_create(name, s, TRUE, FALSE);
2462 if (clmacro_count >= MAX_CLMACROS)
2464 fprintf(stderr, "exim: too many -D options on command line\n");
2467 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2473 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2474 The latter is now a no-op, retained for compatibility only. If -dd is used,
2475 debugging subprocesses of the daemon is disabled. */
2478 if (Ustrcmp(argrest, "ropcr") == 0)
2480 /* drop_cr = TRUE; */
2483 /* Use an intermediate variable so that we don't set debugging while
2484 decoding the debugging bits. */
2488 unsigned int selector = D_default;
2491 if (*argrest == 'd')
2493 debug_daemon = TRUE;
2497 decode_bits(&selector, 1, debug_notall, argrest,
2498 debug_options, debug_options_count, US"debug", 0);
2499 debug_selector = selector;
2504 /* -E: This is a local error message. This option is not intended for
2505 external use at all, but is not restricted to trusted callers because it
2506 does no harm (just suppresses certain error messages) and if Exim is run
2507 not setuid root it won't always be trusted when it generates error
2508 messages using this option. If there is a message id following -E, point
2509 message_reference at it, for logging. */
2512 local_error_message = TRUE;
2513 if (mac_ismsgid(argrest)) message_reference = argrest;
2517 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2518 option, so it looks as if historically the -oex options are also callable
2519 without the leading -o. So we have to accept them. Before the switch,
2520 anything starting -oe has been converted to -e. Exim does not support all
2521 of the sendmail error options. */
2524 if (Ustrcmp(argrest, "e") == 0)
2526 arg_error_handling = ERRORS_SENDER;
2527 errors_sender_rc = EXIT_SUCCESS;
2529 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2530 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2531 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2532 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2537 /* -F: Set sender's full name, used instead of the gecos entry from
2538 the password file. Since users can usually alter their gecos entries,
2539 there's no security involved in using this instead. The data can follow
2540 the -F or be in the next argument. */
2545 if(++i < argc) argrest = argv[i]; else
2546 { badarg = TRUE; break; }
2548 originator_name = argrest;
2549 sender_name_forced = TRUE;
2553 /* -f: Set sender's address - this value is only actually used if Exim is
2554 run by a trusted user, or if untrusted_set_sender is set and matches the
2555 address, except that the null address can always be set by any user. The
2556 test for this happens later, when the value given here is ignored when not
2557 permitted. For an untrusted user, the actual sender is still put in Sender:
2558 if it doesn't match the From: header (unless no_local_from_check is set).
2559 The data can follow the -f or be in the next argument. The -r switch is an
2560 obsolete form of -f but since there appear to be programs out there that
2561 use anything that sendmail has ever supported, better accept it - the
2562 synonymizing is done before the switch above.
2564 At this stage, we must allow domain literal addresses, because we don't
2565 know what the setting of allow_domain_literals is yet. Ditto for trailing
2566 dots and strip_trailing_dot. */
2570 int dummy_start, dummy_end;
2574 if (i+1 < argc) argrest = argv[++i]; else
2575 { badarg = TRUE; break; }
2578 sender_address = string_sprintf(""); /* Ensure writeable memory */
2581 uschar *temp = argrest + Ustrlen(argrest) - 1;
2582 while (temp >= argrest && isspace(*temp)) temp--;
2583 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2584 allow_domain_literals = TRUE;
2585 strip_trailing_dot = TRUE;
2587 allow_utf8_domains = TRUE;
2589 sender_address = parse_extract_address(argrest, &errmess,
2590 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2592 message_smtputf8 = string_is_utf8(sender_address);
2593 allow_utf8_domains = FALSE;
2595 allow_domain_literals = FALSE;
2596 strip_trailing_dot = FALSE;
2597 if (sender_address == NULL)
2599 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2600 return EXIT_FAILURE;
2603 sender_address_forced = TRUE;
2607 /* -G: sendmail invocation to specify that it's a gateway submission and
2608 sendmail may complain about problems instead of fixing them.
2609 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2610 not at this time complain about problems. */
2616 /* -h: Set the hop count for an incoming message. Exim does not currently
2617 support this; it always computes it by counting the Received: headers.
2618 To put it in will require a change to the spool header file format. */
2623 if(++i < argc) argrest = argv[i]; else
2624 { badarg = TRUE; break; }
2626 if (!isdigit(*argrest)) badarg = TRUE;
2630 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2631 not to be documented for sendmail but mailx (at least) uses it) */
2634 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2638 /* -L: set the identifier used for syslog; equivalent to setting
2639 syslog_processname in the config file, but needs to be an admin option. */
2642 if (*argrest == '\0')
2644 if(++i < argc) argrest = argv[i]; else
2645 { badarg = TRUE; break; }
2647 sz = Ustrlen(argrest);
2650 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2651 return EXIT_FAILURE;
2655 fprintf(stderr, "exim: the -L syslog name is too short\n");
2656 return EXIT_FAILURE;
2658 cmdline_syslog_name = argrest;
2662 receiving_message = FALSE;
2664 /* -MC: continue delivery of another message via an existing open
2665 file descriptor. This option is used for an internal call by the
2666 smtp transport when there is a pending message waiting to go to an
2667 address to which it has got a connection. Five subsequent arguments are
2668 required: transport name, host name, IP address, sequence number, and
2669 message_id. Transports may decline to create new processes if the sequence
2670 number gets too big. The channel is stdin. This (-MC) must be the last
2671 argument. There's a subsequent check that the real-uid is privileged.
2673 If we are running in the test harness. delay for a bit, to let the process
2674 that set this one up complete. This makes for repeatability of the logging,
2677 if (Ustrcmp(argrest, "C") == 0)
2679 union sockaddr_46 interface_sock;
2680 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2684 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2685 return EXIT_FAILURE;
2688 if (msg_action_arg >= 0)
2690 fprintf(stderr, "exim: incompatible arguments\n");
2691 return EXIT_FAILURE;
2694 continue_transport = argv[++i];
2695 continue_hostname = argv[++i];
2696 continue_host_address = argv[++i];
2697 continue_sequence = Uatoi(argv[++i]);
2698 msg_action = MSG_DELIVER;
2699 msg_action_arg = ++i;
2700 forced_delivery = TRUE;
2701 queue_run_pid = passed_qr_pid;
2702 queue_run_pipe = passed_qr_pipe;
2704 if (!mac_ismsgid(argv[i]))
2706 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2708 return EXIT_FAILURE;
2711 /* Set up $sending_ip_address and $sending_port */
2713 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2715 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2719 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2721 return EXIT_FAILURE;
2724 if (running_in_test_harness) millisleep(500);
2728 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2732 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2733 precedes -MC (see above). The flag indicates that the host to which
2734 Exim is connected has accepted an AUTH sequence. */
2736 case 'A': smtp_authenticated = TRUE; break;
2738 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2739 that exim is connected to supports the esmtp extension DSN */
2741 case 'D': smtp_peer_options |= PEER_OFFERED_DSN; break;
2743 /* -MCG: set the queue name, to a non-default value */
2745 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2749 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2751 case 'K': smtp_peer_options |= PEER_OFFERED_CHUNKING; break;
2753 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2754 it preceded -MC (see above) */
2756 case 'P': smtp_peer_options |= PEER_OFFERED_PIPE; break;
2758 /* -MCQ: pass on the pid of the queue-running process that started
2759 this chain of deliveries and the fd of its synchronizing pipe; this
2760 is useful only when it precedes -MC (see above) */
2762 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2764 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2768 /* -MCS: set the smtp_use_size flag; this is useful only when it
2769 precedes -MC (see above) */
2771 case 'S': smtp_peer_options |= PEER_OFFERED_SIZE; break;
2774 /* -MCT: set the tls_offered flag; this is useful only when it
2775 precedes -MC (see above). The flag indicates that the host to which
2776 Exim is connected has offered TLS support. */
2778 case 'T': smtp_peer_options |= PEER_OFFERED_TLS; break;
2781 default: badarg = TRUE; break;
2786 /* -M[x]: various operations on the following list of message ids:
2787 -M deliver the messages, ignoring next retry times and thawing
2788 -Mc deliver the messages, checking next retry times, no thawing
2789 -Mf freeze the messages
2790 -Mg give up on the messages
2791 -Mt thaw the messages
2792 -Mrm remove the messages
2793 In the above cases, this must be the last option. There are also the
2794 following options which are followed by a single message id, and which
2795 act on that message. Some of them use the "recipient" addresses as well.
2796 -Mar add recipient(s)
2797 -Mmad mark all recipients delivered
2798 -Mmd mark recipients(s) delivered
2800 -Mset load a message for use with -be
2802 -Mvc show copy (of whole message, in RFC 2822 format)
2807 else if (*argrest == 0)
2809 msg_action = MSG_DELIVER;
2810 forced_delivery = deliver_force_thaw = TRUE;
2812 else if (Ustrcmp(argrest, "ar") == 0)
2814 msg_action = MSG_ADD_RECIPIENT;
2815 one_msg_action = TRUE;
2817 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2818 else if (Ustrcmp(argrest, "es") == 0)
2820 msg_action = MSG_EDIT_SENDER;
2821 one_msg_action = TRUE;
2823 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2824 else if (Ustrcmp(argrest, "g") == 0)
2826 msg_action = MSG_DELIVER;
2827 deliver_give_up = TRUE;
2829 else if (Ustrcmp(argrest, "mad") == 0)
2831 msg_action = MSG_MARK_ALL_DELIVERED;
2833 else if (Ustrcmp(argrest, "md") == 0)
2835 msg_action = MSG_MARK_DELIVERED;
2836 one_msg_action = TRUE;
2838 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2839 else if (Ustrcmp(argrest, "set") == 0)
2841 msg_action = MSG_LOAD;
2842 one_msg_action = TRUE;
2844 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2845 else if (Ustrcmp(argrest, "vb") == 0)
2847 msg_action = MSG_SHOW_BODY;
2848 one_msg_action = TRUE;
2850 else if (Ustrcmp(argrest, "vc") == 0)
2852 msg_action = MSG_SHOW_COPY;
2853 one_msg_action = TRUE;
2855 else if (Ustrcmp(argrest, "vh") == 0)
2857 msg_action = MSG_SHOW_HEADER;
2858 one_msg_action = TRUE;
2860 else if (Ustrcmp(argrest, "vl") == 0)
2862 msg_action = MSG_SHOW_LOG;
2863 one_msg_action = TRUE;
2865 else { badarg = TRUE; break; }
2867 /* All the -Mxx options require at least one message id. */
2869 msg_action_arg = i + 1;
2870 if (msg_action_arg >= argc)
2872 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2873 return EXIT_FAILURE;
2876 /* Some require only message ids to follow */
2878 if (!one_msg_action)
2881 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2883 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2885 return EXIT_FAILURE;
2887 goto END_ARG; /* Remaining args are ids */
2890 /* Others require only one message id, possibly followed by addresses,
2891 which will be handled as normal arguments. */
2895 if (!mac_ismsgid(argv[msg_action_arg]))
2897 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2898 argv[msg_action_arg], arg);
2899 return EXIT_FAILURE;
2906 /* Some programs seem to call the -om option without the leading o;
2907 for sendmail it askes for "me too". Exim always does this. */
2910 if (*argrest != 0) badarg = TRUE;
2914 /* -N: don't do delivery - a debugging option that stops transports doing
2915 their thing. It implies debugging at the D_v level. */
2920 dont_deliver = TRUE;
2921 debug_selector |= D_v;
2922 debug_file = stderr;
2928 /* -n: This means "don't alias" in sendmail, apparently.
2929 For normal invocations, it has no effect.
2930 It may affect some other options. */
2936 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2937 option to the specified value. This form uses long names. We need to handle
2938 -O option=value and -Ooption=value. */
2945 fprintf(stderr, "exim: string expected after -O\n");
2953 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2956 if (*argrest == 'A')
2958 alias_arg = argrest + 1;
2959 if (alias_arg[0] == 0)
2961 if (i+1 < argc) alias_arg = argv[++i]; else
2963 fprintf(stderr, "exim: string expected after -oA\n");
2969 /* -oB: Set a connection message max value for remote deliveries */
2971 else if (*argrest == 'B')
2973 uschar *p = argrest + 1;
2976 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2978 connection_max_messages = 1;
2987 fprintf(stderr, "exim: number expected after -oB\n");
2990 connection_max_messages = Uatoi(p);
2994 /* -odb: background delivery */
2996 else if (Ustrcmp(argrest, "db") == 0)
2998 synchronous_delivery = FALSE;
2999 arg_queue_only = FALSE;
3000 queue_only_set = TRUE;
3003 /* -odf: foreground delivery (smail-compatible option); same effect as
3004 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3007 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3009 synchronous_delivery = TRUE;
3010 arg_queue_only = FALSE;
3011 queue_only_set = TRUE;
3014 /* -odq: queue only */
3016 else if (Ustrcmp(argrest, "dq") == 0)
3018 synchronous_delivery = FALSE;
3019 arg_queue_only = TRUE;
3020 queue_only_set = TRUE;
3023 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3024 but no remote delivery */
3026 else if (Ustrcmp(argrest, "dqs") == 0)
3029 arg_queue_only = FALSE;
3030 queue_only_set = TRUE;
3033 /* -oex: Sendmail error flags. As these are also accepted without the
3034 leading -o prefix, for compatibility with vacation and other callers,
3035 they are handled with -e above. */
3037 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3038 -oitrue: Another sendmail syntax for the same */
3040 else if (Ustrcmp(argrest, "i") == 0 ||
3041 Ustrcmp(argrest, "itrue") == 0)
3044 /* -oM*: Set various characteristics for an incoming message; actually
3045 acted on for trusted callers only. */
3047 else if (*argrest == 'M')
3051 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3055 /* -oMa: Set sender host address */
3057 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3059 /* -oMaa: Set authenticator name */
3061 else if (Ustrcmp(argrest, "Maa") == 0)
3062 sender_host_authenticated = argv[++i];
3064 /* -oMas: setting authenticated sender */
3066 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3068 /* -oMai: setting authenticated id */
3070 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3072 /* -oMi: Set incoming interface address */
3074 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3076 /* -oMm: Message reference */
3078 else if (Ustrcmp(argrest, "Mm") == 0)
3080 if (!mac_ismsgid(argv[i+1]))
3082 fprintf(stderr,"-oMm must be a valid message ID\n");
3085 if (!trusted_config)
3087 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3090 message_reference = argv[++i];
3093 /* -oMr: Received protocol */
3095 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3097 /* -oMs: Set sender host name */
3099 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3101 /* -oMt: Set sender ident */
3103 else if (Ustrcmp(argrest, "Mt") == 0)
3105 sender_ident_set = TRUE;
3106 sender_ident = argv[++i];
3109 /* Else a bad argument */
3118 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3119 seem to call this as -m (undocumented), so that is also accepted (see
3122 else if (Ustrcmp(argrest, "m") == 0) {}
3124 /* -oo: An ancient flag for old-style addresses which still seems to
3125 crop up in some calls (see in SCO). */
3127 else if (Ustrcmp(argrest, "o") == 0) {}
3129 /* -oP <name>: set pid file path for daemon */
3131 else if (Ustrcmp(argrest, "P") == 0)
3132 override_pid_file_path = argv[++i];
3134 /* -or <n>: set timeout for non-SMTP acceptance
3135 -os <n>: set timeout for SMTP acceptance */
3137 else if (*argrest == 'r' || *argrest == 's')
3139 int *tp = (*argrest == 'r')?
3140 &arg_receive_timeout : &arg_smtp_receive_timeout;
3141 if (argrest[1] == 0)
3143 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3145 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3148 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3153 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3155 else if (Ustrcmp(argrest, "X") == 0)
3156 override_local_interfaces = argv[++i];
3158 /* Unknown -o argument */
3164 /* -ps: force Perl startup; -pd force delayed Perl startup */
3168 if (*argrest == 's' && argrest[1] == 0)
3170 perl_start_option = 1;
3173 if (*argrest == 'd' && argrest[1] == 0)
3175 perl_start_option = -1;
3180 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3181 which sets the host protocol and host name */
3185 if (i+1 < argc) argrest = argv[++i]; else
3186 { badarg = TRUE; break; }
3191 uschar *hn = Ustrchr(argrest, ':');
3194 received_protocol = argrest;
3198 received_protocol = string_copyn(argrest, hn - argrest);
3199 sender_host_name = hn + 1;
3206 receiving_message = FALSE;
3207 if (queue_interval >= 0)
3209 fprintf(stderr, "exim: -q specified more than once\n");
3213 /* -qq...: Do queue runs in a 2-stage manner */
3215 if (*argrest == 'q')
3217 queue_2stage = TRUE;
3221 /* -qi...: Do only first (initial) deliveries */
3223 if (*argrest == 'i')
3225 queue_run_first_delivery = TRUE;
3229 /* -qf...: Run the queue, forcing deliveries
3230 -qff..: Ditto, forcing thawing as well */
3232 if (*argrest == 'f')
3234 queue_run_force = TRUE;
3235 if (*++argrest == 'f')
3237 deliver_force_thaw = TRUE;
3242 /* -q[f][f]l...: Run the queue only on local deliveries */
3244 if (*argrest == 'l')
3246 queue_run_local = TRUE;
3250 /* -q[f][f][l][G<name>]... Work on the named queue */
3252 if (*argrest == 'G')
3255 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3256 queue_name = string_copyn(argrest, i);
3258 if (*argrest == '/') argrest++;
3261 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3262 only, optionally named, optionally starting from a given message id. */
3264 if (*argrest == 0 &&
3265 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3268 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3269 start_queue_run_id = argv[++i];
3270 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3271 stop_queue_run_id = argv[++i];
3274 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3275 forced, optionally local only, optionally named. */
3277 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3280 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3286 case 'R': /* Synonymous with -qR... */
3287 receiving_message = FALSE;
3289 /* -Rf: As -R (below) but force all deliveries,
3290 -Rff: Ditto, but also thaw all frozen messages,
3291 -Rr: String is regex
3292 -Rrf: Regex and force
3293 -Rrff: Regex and force and thaw
3295 in all cases provided there are no further characters in this
3301 for (i = 0; i < nelem(rsopts); i++)
3302 if (Ustrcmp(argrest, rsopts[i]) == 0)
3304 if (i != 2) queue_run_force = TRUE;
3305 if (i >= 2) deliver_selectstring_regex = TRUE;
3306 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3307 argrest += Ustrlen(rsopts[i]);
3311 /* -R: Set string to match in addresses for forced queue run to
3312 pick out particular messages. */
3315 deliver_selectstring = argrest;
3316 else if (i+1 < argc)
3317 deliver_selectstring = argv[++i];
3320 fprintf(stderr, "exim: string expected after -R\n");
3326 /* -r: an obsolete synonym for -f (see above) */
3329 /* -S: Like -R but works on sender. */
3331 case 'S': /* Synonymous with -qS... */
3332 receiving_message = FALSE;
3334 /* -Sf: As -S (below) but force all deliveries,
3335 -Sff: Ditto, but also thaw all frozen messages,
3336 -Sr: String is regex
3337 -Srf: Regex and force
3338 -Srff: Regex and force and thaw
3340 in all cases provided there are no further characters in this
3346 for (i = 0; i < nelem(rsopts); i++)
3347 if (Ustrcmp(argrest, rsopts[i]) == 0)
3349 if (i != 2) queue_run_force = TRUE;
3350 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3351 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3352 argrest += Ustrlen(rsopts[i]);
3356 /* -S: Set string to match in addresses for forced queue run to
3357 pick out particular messages. */
3360 deliver_selectstring_sender = argrest;
3361 else if (i+1 < argc)
3362 deliver_selectstring_sender = argv[++i];
3365 fprintf(stderr, "exim: string expected after -S\n");
3370 /* -Tqt is an option that is exclusively for use by the testing suite.
3371 It is not recognized in other circumstances. It allows for the setting up
3372 of explicit "queue times" so that various warning/retry things can be
3373 tested. Otherwise variability of clock ticks etc. cause problems. */
3376 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3377 fudged_queue_times = argv[++i];
3382 /* -t: Set flag to extract recipients from body of message. */
3385 if (*argrest == 0) extract_recipients = TRUE;
3387 /* -ti: Set flag to extract recipients from body of message, and also
3388 specify that dot does not end the message. */
3390 else if (Ustrcmp(argrest, "i") == 0)
3392 extract_recipients = TRUE;
3396 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3399 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3406 /* -U: This means "initial user submission" in sendmail, apparently. The
3407 doc claims that in future sendmail may refuse syntactically invalid
3408 messages instead of fixing them. For the moment, we just ignore it. */
3414 /* -v: verify things - this is a very low-level debugging */
3419 debug_selector |= D_v;
3420 debug_file = stderr;
3426 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3428 The -x flag tells the sendmail command that mail from a local
3429 mail program has National Language Support (NLS) extended characters
3430 in the body of the mail item. The sendmail command can send mail with
3431 extended NLS characters across networks that normally corrupts these
3434 As Exim is 8-bit clean, it just ignores this flag. */
3437 if (*argrest != 0) badarg = TRUE;
3440 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3441 logs to that file. We swallow the parameter and otherwise ignore it. */
3444 if (*argrest == '\0')
3447 fprintf(stderr, "exim: string expected after -X\n");
3453 if (*argrest == '\0')
3454 if (++i < argc) log_oneline = argv[i]; else
3456 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3461 /* All other initial characters are errors */
3466 } /* End of high-level switch statement */
3468 /* Failed to recognize the option, or syntax error */
3472 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3473 "option %s\n", arg);
3479 /* If -R or -S have been specified without -q, assume a single queue run. */
3481 if ( (deliver_selectstring || deliver_selectstring_sender)
3482 && queue_interval < 0)
3487 /* If usage_wanted is set we call the usage function - which never returns */
3488 if (usage_wanted) exim_usage(called_as);
3490 /* Arguments have been processed. Check for incompatibilities. */
3492 (smtp_input || extract_recipients || recipients_arg < argc) &&
3493 (daemon_listen || queue_interval >= 0 || bi_option ||
3494 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3495 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3498 msg_action_arg > 0 &&
3499 (daemon_listen || queue_interval > 0 || list_options ||
3500 (checking && msg_action != MSG_LOAD) ||
3501 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3504 (daemon_listen || queue_interval > 0) &&
3505 (sender_address != NULL || list_options || list_queue || checking ||
3509 daemon_listen && queue_interval == 0
3512 inetd_wait_mode && queue_interval >= 0
3516 (checking || smtp_input || extract_recipients ||
3517 filter_test != FTEST_NONE || bi_option)
3520 verify_address_mode &&
3521 (address_test_mode || smtp_input || extract_recipients ||
3522 filter_test != FTEST_NONE || bi_option)
3525 address_test_mode && (smtp_input || extract_recipients ||
3526 filter_test != FTEST_NONE || bi_option)
3529 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3533 deliver_selectstring != NULL && queue_interval < 0
3536 msg_action == MSG_LOAD &&
3537 (!expansion_test || expansion_test_message != NULL)
3541 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3545 /* If debugging is set up, set the file and the file descriptor to pass on to
3546 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3547 to run in the foreground. */
3549 if (debug_selector != 0)
3551 debug_file = stderr;
3552 debug_fd = fileno(debug_file);
3553 background_daemon = FALSE;
3554 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3555 if (debug_selector != D_v) /* -v only doesn't show this */
3557 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3558 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3560 if (!version_printed)
3561 show_whats_supported(stderr);
3565 /* When started with root privilege, ensure that the limits on the number of
3566 open files and the number of processes (where that is accessible) are
3567 sufficiently large, or are unset, in case Exim has been called from an
3568 environment where the limits are screwed down. Not all OS have the ability to
3569 change some of these limits. */
3573 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3579 #ifdef RLIMIT_NOFILE
3580 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3582 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3584 rlp.rlim_cur = rlp.rlim_max = 0;
3587 /* I originally chose 1000 as a nice big number that was unlikely to
3588 be exceeded. It turns out that some older OS have a fixed upper limit of
3591 if (rlp.rlim_cur < 1000)
3593 rlp.rlim_cur = rlp.rlim_max = 1000;
3594 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3596 rlp.rlim_cur = rlp.rlim_max = 256;
3597 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3598 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3605 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3607 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3609 rlp.rlim_cur = rlp.rlim_max = 0;
3612 #ifdef RLIM_INFINITY
3613 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3615 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3617 if (rlp.rlim_cur < 1000)
3619 rlp.rlim_cur = rlp.rlim_max = 1000;
3621 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3622 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3628 /* Exim is normally entered as root (but some special configurations are
3629 possible that don't do this). However, it always spins off sub-processes that
3630 set their uid and gid as required for local delivery. We don't want to pass on
3631 any extra groups that root may belong to, so we want to get rid of them all at
3634 We need to obey setgroups() at this stage, before possibly giving up root
3635 privilege for a changed configuration file, but later on we might need to
3636 check on the additional groups for the admin user privilege - can't do that
3637 till after reading the config, which might specify the exim gid. Therefore,
3638 save the group list here first. */
3640 group_count = getgroups(NGROUPS_MAX, group_list);
3641 if (group_count < 0)
3643 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3647 /* There is a fundamental difference in some BSD systems in the matter of
3648 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3649 known not to be different. On the "different" systems there is a single group
3650 list, and the first entry in it is the current group. On all other versions of
3651 Unix there is a supplementary group list, which is in *addition* to the current
3652 group. Consequently, to get rid of all extraneous groups on a "standard" system
3653 you pass over 0 groups to setgroups(), while on a "different" system you pass
3654 over a single group - the current group, which is always the first group in the
3655 list. Calling setgroups() with zero groups on a "different" system results in
3656 an error return. The following code should cope with both types of system.
3658 However, if this process isn't running as root, setgroups() can't be used
3659 since you have to be root to run it, even if throwing away groups. Not being
3660 root here happens only in some unusual configurations. We just ignore the
3663 if (setgroups(0, NULL) != 0)
3665 if (setgroups(1, group_list) != 0 && !unprivileged)
3667 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3672 /* If the configuration file name has been altered by an argument on the
3673 command line (either a new file name or a macro definition) and the caller is
3674 not root, or if this is a filter testing run, remove any setuid privilege the
3675 program has and run as the underlying user.
3677 The exim user is locked out of this, which severely restricts the use of -C
3680 Otherwise, set the real ids to the effective values (should be root unless run
3681 from inetd, which it can either be root or the exim uid, if one is configured).
3683 There is a private mechanism for bypassing some of this, in order to make it
3684 possible to test lots of configurations automatically, without having either to
3685 recompile each time, or to patch in an actual configuration file name and other
3686 values (such as the path name). If running in the test harness, pretend that
3687 configuration file changes and macro definitions haven't happened. */
3690 (!trusted_config || /* Config changed, or */
3691 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3692 real_uid != root_uid && /* Not root, and */
3693 !running_in_test_harness /* Not fudged */
3695 expansion_test /* expansion testing */
3697 filter_test != FTEST_NONE) /* Filter testing */
3699 setgroups(group_count, group_list);
3700 exim_setugid(real_uid, real_gid, FALSE,
3701 US"-C, -D, -be or -bf forces real uid");
3702 removed_privilege = TRUE;
3704 /* In the normal case when Exim is called like this, stderr is available
3705 and should be used for any logging information because attempts to write
3706 to the log will usually fail. To arrange this, we unset really_exim. However,
3707 if no stderr is available there is no point - we might as well have a go
3708 at the log (if it fails, syslog will be written).
3710 Note that if the invoker is Exim, the logs remain available. Messing with
3711 this causes unlogged successful deliveries. */
3713 if ((log_stderr != NULL) && (real_uid != exim_uid))
3714 really_exim = FALSE;
3717 /* Privilege is to be retained for the moment. It may be dropped later,
3718 depending on the job that this Exim process has been asked to do. For now, set
3719 the real uid to the effective so that subsequent re-execs of Exim are done by a
3722 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3724 /* If testing a filter, open the file(s) now, before wasting time doing other
3725 setups and reading the message. */
3727 if ((filter_test & FTEST_SYSTEM) != 0)
3729 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3732 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3734 return EXIT_FAILURE;
3738 if ((filter_test & FTEST_USER) != 0)
3740 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3743 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3745 return EXIT_FAILURE;
3749 /* Initialise lookup_list
3750 If debugging, already called above via version reporting.
3751 In either case, we initialise the list of available lookups while running
3752 as root. All dynamically modules are loaded from a directory which is
3753 hard-coded into the binary and is code which, if not a module, would be
3754 part of Exim already. Ability to modify the content of the directory
3755 is equivalent to the ability to modify a setuid binary!
3757 This needs to happen before we read the main configuration. */
3761 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3764 /* Read the main runtime configuration data; this gives up if there
3765 is a failure. It leaves the configuration file open so that the subsequent
3766 configuration data for delivery can be read if needed.
3768 NOTE: immediatly after opening the configuration file we change the working
3769 directory to "/"! Later we change to $spool_directory. We do it there, because
3770 during readconf_main() some expansion takes place already. */
3772 /* Store the initial cwd before we change directories */
3773 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3775 perror("exim: can't get the current working directory");
3780 -be[m] expansion test -
3781 -b[fF] filter test new
3783 -bmalware malware_test_file new
3785 -brw rewrite test new
3787 -bv[s] address verify -
3789 -bP <option> (except -bP config, which sets list_config)
3791 If any of these options is set, we suppress warnings about configuration
3792 issues (currently about tls_advertise_hosts and keep_environment not being
3795 readconf_main(checking || list_options);
3797 /* Now in directory "/" */
3799 if (cleanup_environment() == FALSE)
3800 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3803 /* If an action on specific messages is requested, or if a daemon or queue
3804 runner is being started, we need to know if Exim was called by an admin user.
3805 This is the case if the real user is root or exim, or if the real group is
3806 exim, or if one of the supplementary groups is exim or a group listed in
3807 admin_groups. We don't fail all message actions immediately if not admin_user,
3808 since some actions can be performed by non-admin users. Instead, set admin_user
3809 for later interrogation. */
3811 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3816 for (i = 0; i < group_count; i++)
3818 if (group_list[i] == exim_gid) admin_user = TRUE;
3819 else if (admin_groups != NULL)
3821 for (j = 1; j <= (int)(admin_groups[0]); j++)
3822 if (admin_groups[j] == group_list[i])
3823 { admin_user = TRUE; break; }
3825 if (admin_user) break;
3829 /* Another group of privileged users are the trusted users. These are root,
3830 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3831 are permitted to specify sender_addresses with -f on the command line, and
3832 other message parameters as well. */
3834 if (real_uid == root_uid || real_uid == exim_uid)
3835 trusted_caller = TRUE;
3840 if (trusted_users != NULL)
3842 for (i = 1; i <= (int)(trusted_users[0]); i++)
3843 if (trusted_users[i] == real_uid)
3844 { trusted_caller = TRUE; break; }
3847 if (!trusted_caller && trusted_groups != NULL)
3849 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3851 if (trusted_groups[i] == real_gid)
3852 trusted_caller = TRUE;
3853 else for (j = 0; j < group_count; j++)
3855 if (trusted_groups[i] == group_list[j])
3856 { trusted_caller = TRUE; break; }
3858 if (trusted_caller) break;
3863 /* Handle the decoding of logging options. */
3865 decode_bits(log_selector, log_selector_size, log_notall,
3866 log_selector_string, log_options, log_options_count, US"log", 0);
3871 debug_printf("configuration file is %s\n", config_main_filename);
3872 debug_printf("log selectors =");
3873 for (i = 0; i < log_selector_size; i++)
3874 debug_printf(" %08x", log_selector[i]);
3878 /* If domain literals are not allowed, check the sender address that was
3879 supplied with -f. Ditto for a stripped trailing dot. */
3881 if (sender_address != NULL)
3883 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3885 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3886 "allowed\n", sender_address);
3887 return EXIT_FAILURE;
3889 if (f_end_dot && !strip_trailing_dot)
3891 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3892 "(trailing dot not allowed)\n", sender_address);
3893 return EXIT_FAILURE;
3897 /* See if an admin user overrode our logging. */
3899 if (cmdline_syslog_name != NULL)
3903 syslog_processname = cmdline_syslog_name;
3904 log_file_path = string_copy(CUS"syslog");
3908 /* not a panic, non-privileged users should not be able to spam paniclog */
3910 "exim: you lack sufficient privilege to specify syslog process name\n");
3911 return EXIT_FAILURE;
3915 /* Paranoia check of maximum lengths of certain strings. There is a check
3916 on the length of the log file path in log.c, which will come into effect
3917 if there are any calls to write the log earlier than this. However, if we
3918 get this far but the string is very long, it is better to stop now than to
3919 carry on and (e.g.) receive a message and then have to collapse. The call to
3920 log_write() from here will cause the ultimate panic collapse if the complete
3921 file name exceeds the buffer length. */
3923 if (Ustrlen(log_file_path) > 200)
3924 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3925 "log_file_path is longer than 200 chars: aborting");
3927 if (Ustrlen(pid_file_path) > 200)
3928 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3929 "pid_file_path is longer than 200 chars: aborting");
3931 if (Ustrlen(spool_directory) > 200)
3932 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3933 "spool_directory is longer than 200 chars: aborting");
3935 /* Length check on the process name given to syslog for its TAG field,
3936 which is only permitted to be 32 characters or less. See RFC 3164. */
3938 if (Ustrlen(syslog_processname) > 32)
3939 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3940 "syslog_processname is longer than 32 chars: aborting");
3945 log_write(0, LOG_MAIN, "%s", log_oneline);
3946 return EXIT_SUCCESS;
3949 return EXIT_FAILURE;
3951 /* In some operating systems, the environment variable TMPDIR controls where
3952 temporary files are created; Exim doesn't use these (apart from when delivering
3953 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3954 If TMPDIR is found in the environment, reset it to the value defined in the
3955 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3956 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3957 EXIM_TMPDIR by the build scripts.
3963 if (environ) for (p = USS environ; *p; p++)
3964 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3966 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3967 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3969 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3974 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3975 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3976 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3977 called by a user who has set the TZ variable. This then affects the timestamps
3978 in log files and in Received: headers, and any created Date: header lines. The
3979 required timezone is settable in the configuration file, so nothing can be done
3980 about this earlier - but hopefully nothing will normally be logged earlier than
3981 this. We have to make a new environment if TZ is wrong, but don't bother if
3982 timestamps_utc is set, because then all times are in UTC anyway. */
3984 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3985 timestamps_utc = TRUE;
3988 uschar *envtz = US getenv("TZ");
3990 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3991 : timezone_string != NULL
3994 uschar **p = USS environ;
3998 if (environ) while (*p++) count++;
3999 if (!envtz) count++;
4000 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4001 if (environ) for (p = USS environ; *p; p++)
4002 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4003 if (timezone_string)
4005 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4006 sprintf(CS *newp++, "TZ=%s", timezone_string);
4011 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4012 tod_stamp(tod_log));
4016 /* Handle the case when we have removed the setuid privilege because of -C or
4017 -D. This means that the caller of Exim was not root.
4019 There is a problem if we were running as the Exim user. The sysadmin may
4020 expect this case to retain privilege because "the binary was called by the
4021 Exim user", but it hasn't, because either the -D option set macros, or the
4022 -C option set a non-trusted configuration file. There are two possibilities:
4024 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4025 to do message deliveries. Thus, the fact that it is running as a
4026 non-privileged user is plausible, and might be wanted in some special
4027 configurations. However, really_exim will have been set false when
4028 privilege was dropped, to stop Exim trying to write to its normal log
4029 files. Therefore, re-enable normal log processing, assuming the sysadmin
4030 has set up the log directory correctly.
4032 (2) If deliver_drop_privilege is not set, the configuration won't work as
4033 apparently intended, and so we log a panic message. In order to retain
4034 root for -C or -D, the caller must either be root or be invoking a
4035 trusted configuration file (when deliver_drop_privilege is false). */
4037 if ( removed_privilege
4038 && (!trusted_config || opt_D_used)
4039 && real_uid == exim_uid)
4040 if (deliver_drop_privilege)
4041 really_exim = TRUE; /* let logging work normally */
4043 log_write(0, LOG_MAIN|LOG_PANIC,
4044 "exim user lost privilege for using %s option",
4045 trusted_config? "-D" : "-C");
4047 /* Start up Perl interpreter if Perl support is configured and there is a
4048 perl_startup option, and the configuration or the command line specifies
4049 initializing starting. Note that the global variables are actually called
4050 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4053 if (perl_start_option != 0)
4054 opt_perl_at_start = (perl_start_option > 0);
4055 if (opt_perl_at_start && opt_perl_startup != NULL)
4058 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4059 errstr = init_perl(opt_perl_startup);
4062 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4063 return EXIT_FAILURE;
4065 opt_perl_started = TRUE;
4067 #endif /* EXIM_PERL */
4069 /* Log the arguments of the call if the configuration file said so. This is
4070 a debugging feature for finding out what arguments certain MUAs actually use.
4071 Don't attempt it if logging is disabled, or if listing variables or if
4072 verifying/testing addresses or expansions. */
4074 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4075 && really_exim && !list_options && !checking)
4078 uschar *p = big_buffer;
4079 Ustrcpy(p, "cwd= (failed)");
4081 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4084 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4086 for (i = 0; i < argc; i++)
4088 int len = Ustrlen(argv[i]);
4089 const uschar *printing;
4091 if (p + len + 8 >= big_buffer + big_buffer_size)
4094 log_write(0, LOG_MAIN, "%s", big_buffer);
4095 Ustrcpy(big_buffer, "...");
4098 printing = string_printing(argv[i]);
4099 if (printing[0] == 0) quote = US"\""; else
4101 const uschar *pp = printing;
4103 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4105 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4106 (p - big_buffer) - 4), printing, quote);
4110 if (LOGGING(arguments))
4111 log_write(0, LOG_MAIN, "%s", big_buffer);
4113 debug_printf("%s\n", big_buffer);
4116 /* Set the working directory to be the top-level spool directory. We don't rely
4117 on this in the code, which always uses fully qualified names, but it's useful
4118 for core dumps etc. Don't complain if it fails - the spool directory might not
4119 be generally accessible and calls with the -C option (and others) have lost
4120 privilege by now. Before the chdir, we try to ensure that the directory exists.
4123 if (Uchdir(spool_directory) != 0)
4126 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4127 dummy = /* quieten compiler */ Uchdir(spool_directory);
4130 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4131 alias file. Exim doesn't have such a concept, but this call is screwed into
4132 Sun's YP makefiles. Handle this by calling a configured script, as the real
4133 user who called Exim. The -oA option can be used to pass an argument to the
4138 (void)fclose(config_file);
4139 if (bi_command != NULL)
4143 argv[i++] = bi_command;
4144 if (alias_arg != NULL) argv[i++] = alias_arg;
4147 setgroups(group_count, group_list);
4148 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4150 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4151 (argv[1] == NULL)? US"" : argv[1]);
4153 execv(CS argv[0], (char *const *)argv);
4154 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4159 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4164 /* We moved the admin/trusted check to be immediately after reading the
4165 configuration file. We leave these prints here to ensure that syslog setup,
4166 logfile setup, and so on has already happened. */
4168 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4169 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4171 /* Only an admin user may start the daemon or force a queue run in the default
4172 configuration, but the queue run restriction can be relaxed. Only an admin
4173 user may request that a message be returned to its sender forthwith. Only an
4174 admin user may specify a debug level greater than D_v (because it might show
4175 passwords, etc. in lookup queries). Only an admin user may request a queue
4176 count. Only an admin user can use the test interface to scan for email
4177 (because Exim will be in the spool dir and able to look at mails). */
4181 BOOL debugset = (debug_selector & ~D_v) != 0;
4182 if (deliver_give_up || daemon_listen || malware_test_file ||
4183 (count_queue && queue_list_requires_admin) ||
4184 (list_queue && queue_list_requires_admin) ||
4185 (queue_interval >= 0 && prod_requires_admin) ||
4186 (debugset && !running_in_test_harness))
4188 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4193 /* If the real user is not root or the exim uid, the argument for passing
4194 in an open TCP/IP connection for another message is not permitted, nor is
4195 running with the -N option for any delivery action, unless this call to exim is
4196 one that supplied an input message, or we are using a patched exim for
4197 regression testing. */
4199 if (real_uid != root_uid && real_uid != exim_uid &&
4200 (continue_hostname != NULL ||
4202 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4203 )) && !running_in_test_harness)
4205 fprintf(stderr, "exim: Permission denied\n");
4206 return EXIT_FAILURE;
4209 /* If the caller is not trusted, certain arguments are ignored when running for
4210 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4211 Note that authority for performing certain actions on messages is tested in the
4212 queue_action() function. */
4214 if (!trusted_caller && !checking)
4216 sender_host_name = sender_host_address = interface_address =
4217 sender_ident = received_protocol = NULL;
4218 sender_host_port = interface_port = 0;
4219 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4222 /* If a sender host address is set, extract the optional port number off the
4223 end of it and check its syntax. Do the same thing for the interface address.
4224 Exim exits if the syntax is bad. */
4228 if (sender_host_address != NULL)
4229 sender_host_port = check_port(sender_host_address);
4230 if (interface_address != NULL)
4231 interface_port = check_port(interface_address);
4234 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4239 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4240 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4244 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4245 return EXIT_FAILURE;
4249 /* If an SMTP message is being received check to see if the standard input is a
4250 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4251 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4256 union sockaddr_46 inetd_sock;
4257 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4258 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4260 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4261 if (family == AF_INET || family == AF_INET6)
4263 union sockaddr_46 interface_sock;
4264 size = sizeof(interface_sock);
4266 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4267 interface_address = host_ntoa(-1, &interface_sock, NULL,
4270 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4272 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4275 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4276 NULL, &sender_host_port);
4277 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4278 "inetd is not supported when mua_wrapper is set");
4283 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4284 return EXIT_FAILURE;
4290 /* If the load average is going to be needed while receiving a message, get it
4291 now for those OS that require the first call to os_getloadavg() to be done as
4292 root. There will be further calls later for each message received. */
4294 #ifdef LOAD_AVG_NEEDS_ROOT
4295 if (receiving_message &&
4296 (queue_only_load >= 0 ||
4297 (is_inetd && smtp_load_reserve >= 0)
4300 load_average = OS_GETLOADAVG();
4304 /* The queue_only configuration option can be overridden by -odx on the command
4305 line, except that if queue_only_override is false, queue_only cannot be unset
4306 from the command line. */
4308 if (queue_only_set && (queue_only_override || arg_queue_only))
4309 queue_only = arg_queue_only;
4311 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4314 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4315 if (arg_smtp_receive_timeout >= 0)
4316 smtp_receive_timeout = arg_smtp_receive_timeout;
4318 /* If Exim was started with root privilege, unless we have already removed the
4319 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4320 except when starting the daemon or doing some kind of delivery or address
4321 testing (-bt). These are the only cases when root need to be retained. We run
4322 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4323 retained only for starting the daemon. We always do the initgroups() in this
4324 situation (controlled by the TRUE below), in order to be as close as possible
4325 to the state Exim usually runs in. */
4327 if (!unprivileged && /* originally had root AND */
4328 !removed_privilege && /* still got root AND */
4329 !daemon_listen && /* not starting the daemon */
4330 queue_interval <= 0 && /* (either kind of daemon) */
4332 deliver_drop_privilege || /* requested unprivileged */
4334 queue_interval < 0 && /* not running the queue */
4335 (msg_action_arg < 0 || /* and */
4336 msg_action != MSG_DELIVER) && /* not delivering and */
4337 (!checking || !address_test_mode) /* not address checking */
4341 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4344 /* When we are retaining a privileged uid, we still change to the exim gid. */
4349 rv = setgid(exim_gid);
4350 /* Impact of failure is that some stuff might end up with an incorrect group.
4351 We track this for failures from root, since any attempt to change privilege
4352 by root should succeed and failures should be examined. For non-root,
4353 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4354 no need to complain then. */
4357 if (!(unprivileged || removed_privilege))
4360 "exim: changing group failed: %s\n", strerror(errno));
4364 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4365 (long int)exim_gid, strerror(errno));
4369 /* Handle a request to scan a file for malware */
4370 if (malware_test_file)
4372 #ifdef WITH_CONTENT_SCAN
4374 set_process_info("scanning file for malware");
4375 result = malware_in_file(malware_test_file);
4378 printf("No malware found.\n");
4383 printf("Malware lookup returned non-okay/fail: %d\n", result);
4387 printf("Malware found: %s\n", malware_name);
4389 printf("Malware scan detected malware of unknown name.\n");
4391 printf("Malware scanning not enabled at compile time.\n");
4396 /* Handle a request to list the delivery queue */
4400 set_process_info("listing the queue");
4401 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4405 /* Handle a request to count the delivery queue */
4409 set_process_info("counting the queue");
4414 /* Handle actions on specific messages, except for the force delivery and
4415 message load actions, which are done below. Some actions take a whole list of
4416 message ids, which are known to continue up to the end of the arguments. Others
4417 take a single message id and then operate on the recipients list. */
4419 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4421 int yield = EXIT_SUCCESS;
4422 set_process_info("acting on specified messages");
4424 if (!one_msg_action)
4426 for (i = msg_action_arg; i < argc; i++)
4427 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4428 yield = EXIT_FAILURE;
4431 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4432 recipients_arg)) yield = EXIT_FAILURE;
4436 /* We used to set up here to skip reading the ACL section, on
4437 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4438 Now, since the intro of the ${acl } expansion, ACL definitions may be
4439 needed in transports so we lost the optimisation. */
4443 /* The configuration data will have been read into POOL_PERM because we won't
4444 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4445 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4446 configuration were read into POOL_MAIN, because we don't do any resets till
4447 later on. However, it seems right, and it does ensure that both pools get used.
4450 store_pool = POOL_MAIN;
4452 /* Handle the -brt option. This is for checking out retry configurations.
4453 The next three arguments are a domain name or a complete address, and
4454 optionally two error numbers. All it does is to call the function that
4455 scans the retry configuration data. */
4457 if (test_retry_arg >= 0)
4459 retry_config *yield;
4460 int basic_errno = 0;
4464 if (test_retry_arg >= argc)
4466 printf("-brt needs a domain or address argument\n");
4467 exim_exit(EXIT_FAILURE);
4469 s1 = argv[test_retry_arg++];
4472 /* If the first argument contains no @ and no . it might be a local user
4473 or it might be a single-component name. Treat as a domain. */
4475 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4477 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4478 "being \ntreated as a one-component domain, not as a local part.\n\n",
4482 /* There may be an optional second domain arg. */
4484 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4485 s2 = argv[test_retry_arg++];
4487 /* The final arg is an error name */
4489 if (test_retry_arg < argc)
4491 uschar *ss = argv[test_retry_arg];
4493 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4496 printf("%s\n", CS error);
4497 return EXIT_FAILURE;
4500 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4501 code > 100 as an error is for matching codes to the decade. Turn them into
4502 a real error code, off the decade. */
4504 if (basic_errno == ERRNO_MAIL4XX ||
4505 basic_errno == ERRNO_RCPT4XX ||
4506 basic_errno == ERRNO_DATA4XX)
4508 int code = (more_errno >> 8) & 255;
4510 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4511 else if (code > 100)
4512 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4516 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4517 if (yield == NULL) printf("No retry information found\n"); else
4520 more_errno = yield->more_errno;
4521 printf("Retry rule: %s ", yield->pattern);
4523 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4525 printf("quota%s%s ",
4526 (more_errno > 0)? "_" : "",
4527 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4529 else if (yield->basic_errno == ECONNREFUSED)
4531 printf("refused%s%s ",
4532 (more_errno > 0)? "_" : "",
4533 (more_errno == 'M')? "MX" :
4534 (more_errno == 'A')? "A" : "");
4536 else if (yield->basic_errno == ETIMEDOUT)
4539 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4541 if (more_errno != 0) printf("_%s",
4542 (more_errno == 'M')? "MX" : "A");
4545 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4546 printf("auth_failed ");
4549 for (r = yield->rules; r != NULL; r = r->next)
4551 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4552 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4558 printf(",%d.", x/1000);
4572 exim_exit(EXIT_SUCCESS);
4575 /* Handle a request to list one or more configuration options */
4576 /* If -n was set, we suppress some information */
4580 set_process_info("listing variables");
4581 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4582 else for (i = recipients_arg; i < argc; i++)
4585 (Ustrcmp(argv[i], "router") == 0 ||
4586 Ustrcmp(argv[i], "transport") == 0 ||
4587 Ustrcmp(argv[i], "authenticator") == 0 ||
4588 Ustrcmp(argv[i], "macro") == 0 ||
4589 Ustrcmp(argv[i], "environment") == 0))
4591 readconf_print(argv[i+1], argv[i], flag_n);
4594 else readconf_print(argv[i], NULL, flag_n);
4596 exim_exit(EXIT_SUCCESS);
4601 set_process_info("listing config");
4602 readconf_print(US"config", NULL, flag_n);
4603 exim_exit(EXIT_SUCCESS);
4607 /* Initialise subsystems as required */
4608 #ifndef DISABLE_DKIM
4614 /* Handle a request to deliver one or more messages that are already on the
4615 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4616 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4618 Delivery of specific messages is typically used for a small number when
4619 prodding by hand (when the option forced_delivery will be set) or when
4620 re-execing to regain root privilege. Each message delivery must happen in a
4621 separate process, so we fork a process for each one, and run them sequentially
4622 so that debugging output doesn't get intertwined, and to avoid spawning too
4623 many processes if a long list is given. However, don't fork for the last one;
4624 this saves a process in the common case when Exim is called to deliver just one
4627 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4629 if (prod_requires_admin && !admin_user)
4631 fprintf(stderr, "exim: Permission denied\n");
4632 exim_exit(EXIT_FAILURE);
4634 set_process_info("delivering specified messages");
4635 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4636 for (i = msg_action_arg; i < argc; i++)
4641 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4642 else if ((pid = fork()) == 0)
4644 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4645 _exit(EXIT_SUCCESS);
4649 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4651 exim_exit(EXIT_FAILURE);
4655 exim_exit(EXIT_SUCCESS);
4659 /* If only a single queue run is requested, without SMTP listening, we can just
4660 turn into a queue runner, with an optional starting message id. */
4662 if (queue_interval == 0 && !daemon_listen)
4664 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4665 (start_queue_run_id == NULL)? US"" : US" starting at ",
4666 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4667 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4668 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4670 set_process_info("running the '%s' queue (single queue run)", queue_name);
4672 set_process_info("running the queue (single queue run)");
4673 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4674 exim_exit(EXIT_SUCCESS);
4678 /* Find the login name of the real user running this process. This is always
4679 needed when receiving a message, because it is written into the spool file. It
4680 may also be used to construct a from: or a sender: header, and in this case we
4681 need the user's full name as well, so save a copy of it, checked for RFC822
4682 syntax and munged if necessary, if it hasn't previously been set by the -F
4683 argument. We may try to get the passwd entry more than once, in case NIS or
4684 other delays are in evidence. Save the home directory for use in filter testing
4689 if ((pw = getpwuid(real_uid)) != NULL)
4691 originator_login = string_copy(US pw->pw_name);
4692 originator_home = string_copy(US pw->pw_dir);
4694 /* If user name has not been set by -F, set it from the passwd entry
4695 unless -f has been used to set the sender address by a trusted user. */
4697 if (originator_name == NULL)
4699 if (sender_address == NULL ||
4700 (!trusted_caller && filter_test == FTEST_NONE))
4702 uschar *name = US pw->pw_gecos;
4703 uschar *amp = Ustrchr(name, '&');
4706 /* Most Unix specify that a '&' character in the gecos field is
4707 replaced by a copy of the login name, and some even specify that
4708 the first character should be upper cased, so that's what we do. */
4713 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4714 amp - name, name, &loffset, originator_login, amp + 1);
4715 buffer[loffset] = toupper(buffer[loffset]);
4719 /* If a pattern for matching the gecos field was supplied, apply
4720 it and then expand the name string. */
4722 if (gecos_pattern != NULL && gecos_name != NULL)
4725 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4727 if (regex_match_and_setup(re, name, 0, -1))
4729 uschar *new_name = expand_string(gecos_name);
4731 if (new_name != NULL)
4733 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4734 "gecos field \"%s\"\n", new_name, name);
4737 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4738 "\"%s\": %s\n", gecos_name, expand_string_message);
4740 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4741 "gecos field \"%s\"\n", gecos_pattern, name);
4742 store_free((void *)re);
4744 originator_name = string_copy(name);
4747 /* A trusted caller has used -f but not -F */
4749 else originator_name = US"";
4752 /* Break the retry loop */
4757 if (++i > finduser_retries) break;
4761 /* If we cannot get a user login, log the incident and give up, unless the
4762 configuration specifies something to use. When running in the test harness,
4763 any setting of unknown_login overrides the actual name. */
4765 if (originator_login == NULL || running_in_test_harness)
4767 if (unknown_login != NULL)
4769 originator_login = expand_string(unknown_login);
4770 if (originator_name == NULL && unknown_username != NULL)
4771 originator_name = expand_string(unknown_username);
4772 if (originator_name == NULL) originator_name = US"";
4774 if (originator_login == NULL)
4775 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4779 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4782 originator_name = string_copy(parse_fix_phrase(originator_name,
4783 Ustrlen(originator_name), big_buffer, big_buffer_size));
4785 /* If a message is created by this call of Exim, the uid/gid of its originator
4786 are those of the caller. These values are overridden if an existing message is
4787 read in from the spool. */
4789 originator_uid = real_uid;
4790 originator_gid = real_gid;
4792 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4793 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4795 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4796 returns. We leave this till here so that the originator_ fields are available
4797 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4800 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4804 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4805 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4806 "mua_wrapper is set");
4811 /* If the sender ident has not been set (by a trusted caller) set it to
4812 the caller. This will get overwritten below for an inetd call. If a trusted
4813 caller has set it empty, unset it. */
4815 if (sender_ident == NULL) sender_ident = originator_login;
4816 else if (sender_ident[0] == 0) sender_ident = NULL;
4818 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4819 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4820 originator_* variables set. */
4822 if (test_rewrite_arg >= 0)
4824 really_exim = FALSE;
4825 if (test_rewrite_arg >= argc)
4827 printf("-brw needs an address argument\n");
4828 exim_exit(EXIT_FAILURE);
4830 rewrite_test(argv[test_rewrite_arg]);
4831 exim_exit(EXIT_SUCCESS);
4834 /* A locally-supplied message is considered to be coming from a local user
4835 unless a trusted caller supplies a sender address with -f, or is passing in the
4836 message via SMTP (inetd invocation or otherwise). */
4838 if ((sender_address == NULL && !smtp_input) ||
4839 (!trusted_caller && filter_test == FTEST_NONE))
4841 sender_local = TRUE;
4843 /* A trusted caller can supply authenticated_sender and authenticated_id
4844 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4845 defaults except when host checking. */
4847 if (authenticated_sender == NULL && !host_checking)
4848 authenticated_sender = string_sprintf("%s@%s", originator_login,
4849 qualify_domain_sender);
4850 if (authenticated_id == NULL && !host_checking)
4851 authenticated_id = originator_login;
4854 /* Trusted callers are always permitted to specify the sender address.
4855 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4856 is specified is the empty address. However, if a trusted caller does not
4857 specify a sender address for SMTP input, we leave sender_address unset. This
4858 causes the MAIL commands to be honoured. */
4860 if ((!smtp_input && sender_address == NULL) ||
4861 !receive_check_set_sender(sender_address))
4863 /* Either the caller is not permitted to set a general sender, or this is
4864 non-SMTP input and the trusted caller has not set a sender. If there is no
4865 sender, or if a sender other than <> is set, override with the originator's
4866 login (which will get qualified below), except when checking things. */
4868 if (sender_address == NULL /* No sender_address set */
4870 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4871 !checking)) /* Not running tests, including filter tests */
4873 sender_address = originator_login;
4874 sender_address_forced = FALSE;
4875 sender_address_domain = 0;
4879 /* Remember whether an untrusted caller set the sender address */
4881 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4883 /* Ensure that the sender address is fully qualified unless it is the empty
4884 address, which indicates an error message, or doesn't exist (root caller, smtp
4885 interface, no -f argument). */
4887 if (sender_address != NULL && sender_address[0] != 0 &&
4888 sender_address_domain == 0)
4889 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4890 qualify_domain_sender);
4892 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4894 /* Handle a request to verify a list of addresses, or test them for delivery.
4895 This must follow the setting of the sender address, since routers can be
4896 predicated upon the sender. If no arguments are given, read addresses from
4897 stdin. Set debug_level to at least D_v to get full output for address testing.
4900 if (verify_address_mode || address_test_mode)
4903 int flags = vopt_qualify;
4905 if (verify_address_mode)
4907 if (!verify_as_sender) flags |= vopt_is_recipient;
4908 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4913 flags |= vopt_is_recipient;
4914 debug_selector |= D_v;
4915 debug_file = stderr;
4916 debug_fd = fileno(debug_file);
4917 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4920 if (recipients_arg < argc)
4922 while (recipients_arg < argc)
4924 uschar *s = argv[recipients_arg++];
4927 BOOL finished = FALSE;
4928 uschar *ss = parse_find_address_end(s, FALSE);
4929 if (*ss == ',') *ss = 0; else finished = TRUE;
4930 test_address(s, flags, &exit_value);
4933 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4940 uschar *s = get_stdinput(NULL, NULL);
4941 if (s == NULL) break;
4942 test_address(s, flags, &exit_value);
4946 exim_exit(exit_value);
4949 /* Handle expansion checking. Either expand items on the command line, or read
4950 from stdin if there aren't any. If -Mset was specified, load the message so
4951 that its variables can be used, but restrict this facility to admin users.
4952 Otherwise, if -bem was used, read a message from stdin. */
4956 dns_init(FALSE, FALSE, FALSE);
4957 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4959 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4962 fprintf(stderr, "exim: permission denied\n");
4965 message_id = argv[msg_action_arg];
4966 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4967 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4968 printf ("Failed to load message datafile %s\n", message_id);
4969 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4970 printf ("Failed to load message %s\n", message_id);
4973 /* Read a test message from a file. We fudge it up to be on stdin, saving
4974 stdin itself for later reading of expansion strings. */
4976 else if (expansion_test_message != NULL)
4978 int save_stdin = dup(0);
4979 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4982 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4984 return EXIT_FAILURE;
4987 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4988 message_ended = END_NOTENDED;
4989 read_message_body(receive_msg(extract_recipients));
4990 message_linecount += body_linecount;
4991 (void)dup2(save_stdin, 0);
4992 (void)close(save_stdin);
4993 clearerr(stdin); /* Required by Darwin */
4996 /* Allow $recipients for this testing */
4998 enable_dollar_recipients = TRUE;
5000 /* Expand command line items */
5002 if (recipients_arg < argc)
5004 while (recipients_arg < argc)
5006 uschar *s = argv[recipients_arg++];
5007 uschar *ss = expand_string(s);
5008 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5009 else printf("%s\n", CS ss);
5017 char *(*fn_readline)(const char *) = NULL;
5018 void (*fn_addhist)(const char *) = NULL;
5021 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5027 uschar *source = get_stdinput(fn_readline, fn_addhist);
5028 if (source == NULL) break;
5029 ss = expand_string(source);
5031 printf ("Failed: %s\n", expand_string_message);
5032 else printf("%s\n", CS ss);
5036 if (dlhandle != NULL) dlclose(dlhandle);
5040 /* The data file will be open after -Mset */
5042 if (deliver_datafile >= 0)
5044 (void)close(deliver_datafile);
5045 deliver_datafile = -1;
5048 exim_exit(EXIT_SUCCESS);
5052 /* The active host name is normally the primary host name, but it can be varied
5053 for hosts that want to play several parts at once. We need to ensure that it is
5054 set for host checking, and for receiving messages. */
5056 smtp_active_hostname = primary_hostname;
5057 if (raw_active_hostname != NULL)
5059 uschar *nah = expand_string(raw_active_hostname);
5062 if (!expand_string_forcedfail)
5063 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5064 "(smtp_active_hostname): %s", raw_active_hostname,
5065 expand_string_message);
5067 else if (nah[0] != 0) smtp_active_hostname = nah;
5070 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5071 given IP address so that the blocking and relay configuration can be tested.
5072 Unless a sender_ident was set by -oMt, we discard it (the default is the
5073 caller's login name). An RFC 1413 call is made only if we are running in the
5074 test harness and an incoming interface and both ports are specified, because
5075 there is no TCP/IP call to find the ident for. */
5082 if (!sender_ident_set)
5084 sender_ident = NULL;
5085 if (running_in_test_harness && sender_host_port != 0 &&
5086 interface_address != NULL && interface_port != 0)
5087 verify_get_ident(1413);
5090 /* In case the given address is a non-canonical IPv6 address, canonicize
5091 it. The code works for both IPv4 and IPv6, as it happens. */
5093 size = host_aton(sender_host_address, x);
5094 sender_host_address = store_get(48); /* large enough for full IPv6 */
5095 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5097 /* Now set up for testing */
5099 host_build_sender_fullhost();
5103 sender_local = FALSE;
5104 sender_host_notsocket = TRUE;
5105 debug_file = stderr;
5106 debug_fd = fileno(debug_file);
5107 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5108 "**** but without any ident (RFC 1413) callback.\n"
5109 "**** This is not for real!\n\n",
5110 sender_host_address);
5112 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5113 if (verify_check_host(&hosts_connection_nolog) == OK)
5114 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5115 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5117 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5118 because a log line has already been written for all its failure exists
5119 (usually "connection refused: <reason>") and writing another one is
5120 unnecessary clutter. */
5122 if (smtp_start_session())
5124 reset_point = store_get(0);
5127 store_reset(reset_point);
5128 if (smtp_setup_msg() <= 0) break;
5129 if (!receive_msg(FALSE)) break;
5133 exim_exit(EXIT_SUCCESS);
5137 /* Arrange for message reception if recipients or SMTP were specified;
5138 otherwise complain unless a version print (-bV) happened or this is a filter
5139 verification test or info dump.
5140 In the former case, show the configuration file name. */
5142 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5144 if (version_printed)
5146 printf("Configuration file is %s\n", config_main_filename);
5147 return EXIT_SUCCESS;
5150 if (info_flag != CMDINFO_NONE)
5152 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5153 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5156 if (filter_test == FTEST_NONE)
5157 exim_usage(called_as);
5161 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5162 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5163 that we are not called from inetd, because that is rejected above. The
5164 following configuration settings are forced here:
5166 (1) Synchronous delivery (-odi)
5167 (2) Errors to stderr (-oep == -oeq)
5168 (3) No parallel remote delivery
5169 (4) Unprivileged delivery
5171 We don't force overall queueing options because there are several of them;
5172 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5173 to override any SMTP queueing. */
5177 synchronous_delivery = TRUE;
5178 arg_error_handling = ERRORS_STDERR;
5179 remote_max_parallel = 1;
5180 deliver_drop_privilege = TRUE;
5182 queue_smtp_domains = NULL;
5184 message_utf8_downconvert = -1; /* convert-if-needed */
5189 /* Prepare to accept one or more new messages on the standard input. When a
5190 message has been read, its id is returned in message_id[]. If doing immediate
5191 delivery, we fork a delivery process for each received message, except for the
5192 last one, where we can save a process switch.
5194 It is only in non-smtp mode that error_handling is allowed to be changed from
5195 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5196 sendmail error modes other than -oem ever actually used? Later: yes.) */
5198 if (!smtp_input) error_handling = arg_error_handling;
5200 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5201 logging being sent down the socket and make an identd call to get the
5206 (void)fclose(stderr);
5207 exim_nullstd(); /* Re-open to /dev/null */
5208 verify_get_ident(IDENT_PORT);
5209 host_build_sender_fullhost();
5210 set_process_info("handling incoming connection from %s via inetd",
5214 /* If the sender host address has been set, build sender_fullhost if it hasn't
5215 already been done (which it will have been for inetd). This caters for the
5216 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5217 so that the test for IP options is skipped for -bs input. */
5219 if (sender_host_address != NULL && sender_fullhost == NULL)
5221 host_build_sender_fullhost();
5222 set_process_info("handling incoming connection from %s via -oMa",
5224 sender_host_notsocket = TRUE;
5227 /* Otherwise, set the sender host as unknown except for inetd calls. This
5228 prevents host checking in the case of -bs not from inetd and also for -bS. */
5230 else if (!is_inetd) sender_host_unknown = TRUE;
5232 /* If stdout does not exist, then dup stdin to stdout. This can happen
5233 if exim is started from inetd. In this case fd 0 will be set to the socket,
5234 but fd 1 will not be set. This also happens for passed SMTP channels. */
5236 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5238 /* Set up the incoming protocol name and the state of the program. Root is
5239 allowed to force received protocol via the -oMr option above. If we have come
5240 via inetd, the process info has already been set up. We don't set
5241 received_protocol here for smtp input, as it varies according to
5242 batch/HELO/EHLO/AUTH/TLS. */
5246 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5247 smtp_batched_input? "batched " : "",
5248 (sender_address!= NULL)? sender_address : originator_login);
5252 if (received_protocol == NULL)
5253 received_protocol = string_sprintf("local%s", called_as);
5254 set_process_info("accepting a local non-SMTP message from <%s>",
5258 /* Initialize the session_local_queue-only flag (this will be ignored if
5259 mua_wrapper is set) */
5262 session_local_queue_only = queue_only;
5264 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5265 the spool if so configured. On failure, we must not attempt to send an error
5266 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5267 error code is given.) */
5269 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5271 fprintf(stderr, "exim: insufficient disk space\n");
5272 return EXIT_FAILURE;
5275 /* If this is smtp input of any kind, real or batched, handle the start of the
5278 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5279 because a log line has already been written for all its failure exists
5280 (usually "connection refused: <reason>") and writing another one is
5281 unnecessary clutter. */
5287 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5288 if (verify_check_host(&hosts_connection_nolog) == OK)
5289 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5290 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5291 if (!smtp_start_session())
5294 exim_exit(EXIT_SUCCESS);
5298 /* Otherwise, set up the input size limit here. */
5302 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5303 if (expand_string_message != NULL)
5305 if (thismessage_size_limit == -1)
5306 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5307 "message_size_limit: %s", expand_string_message);
5309 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5310 "message_size_limit: %s", expand_string_message);
5314 /* Loop for several messages when reading SMTP input. If we fork any child
5315 processes, we don't want to wait for them unless synchronous delivery is
5316 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5317 same as SIG_DFL, despite the fact that documentation often lists the default as
5318 "ignore". This is a confusing area. This is what I know:
5320 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5321 processes that complete simply to go away without ever becoming defunct. You
5322 can't then wait for them - but we don't want to wait for them in the
5323 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5324 happen for all OS (e.g. *BSD is different).
5326 But that's not the end of the story. Some (many? all?) systems have the
5327 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5328 has by default, so it seems that the difference is merely one of default
5329 (compare restarting vs non-restarting signals).
5331 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5332 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5333 of the loop below. Paranoia rules.
5335 February 2003: That's *still* not the end of the story. There are now versions
5336 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5337 process then calls waitpid(), a grumble is written to the system log, because
5338 this is logically inconsistent. In other words, it doesn't like the paranoia.
5339 As a consequenc of this, the waitpid() below is now excluded if we are sure
5340 that SIG_IGN works. */
5342 if (!synchronous_delivery)
5345 struct sigaction act;
5346 act.sa_handler = SIG_IGN;
5347 sigemptyset(&(act.sa_mask));
5348 act.sa_flags = SA_NOCLDWAIT;
5349 sigaction(SIGCHLD, &act, NULL);
5351 signal(SIGCHLD, SIG_IGN);
5355 /* Save the current store pool point, for resetting at the start of
5356 each message, and save the real sender address, if any. */
5358 reset_point = store_get(0);
5359 real_sender_address = sender_address;
5361 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5362 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5367 store_reset(reset_point);
5370 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5371 input and build the recipients list, before calling receive_msg() to read the
5372 message proper. Whatever sender address is given in the SMTP transaction is
5373 often ignored for local senders - we use the actual sender, which is normally
5374 either the underlying user running this process or a -f argument provided by
5375 a trusted caller. It is saved in real_sender_address. The test for whether to
5376 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5381 if ((rc = smtp_setup_msg()) > 0)
5383 if (real_sender_address != NULL &&
5384 !receive_check_set_sender(sender_address))
5386 sender_address = raw_sender = real_sender_address;
5387 sender_address_unrewritten = NULL;
5390 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5391 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5392 the very end. The result of the ACL is ignored (as for other non-SMTP
5393 messages). It is run for its potential side effects. */
5395 if (smtp_batched_input && acl_not_smtp_start != NULL)
5397 uschar *user_msg, *log_msg;
5398 enable_dollar_recipients = TRUE;
5399 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5400 &user_msg, &log_msg);
5401 enable_dollar_recipients = FALSE;
5404 /* Now get the data for the message */
5406 more = receive_msg(extract_recipients);
5407 if (message_id[0] == 0)
5410 smtp_log_no_mail(); /* Log no mail if configured */
5411 exim_exit(EXIT_FAILURE);
5416 smtp_log_no_mail(); /* Log no mail if configured */
5417 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5421 /* In the non-SMTP case, we have all the information from the command
5422 line, but must process it in case it is in the more general RFC822
5423 format, and in any case, to detect syntax errors. Also, it appears that
5424 the use of comma-separated lists as single arguments is common, so we
5425 had better support them. */
5431 int count = argc - recipients_arg;
5432 uschar **list = argv + recipients_arg;
5434 /* These options cannot be changed dynamically for non-SMTP messages */
5436 active_local_sender_retain = local_sender_retain;
5437 active_local_from_check = local_from_check;
5439 /* Save before any rewriting */
5441 raw_sender = string_copy(sender_address);
5443 /* Loop for each argument */
5445 for (i = 0; i < count; i++)
5447 int start, end, domain;
5449 uschar *s = list[i];
5451 /* Loop for each comma-separated address */
5455 BOOL finished = FALSE;
5457 uschar *ss = parse_find_address_end(s, FALSE);
5459 if (*ss == ',') *ss = 0; else finished = TRUE;
5461 /* Check max recipients - if -t was used, these aren't recipients */
5463 if (recipients_max > 0 && ++rcount > recipients_max &&
5464 !extract_recipients)
5465 if (error_handling == ERRORS_STDERR)
5467 fprintf(stderr, "exim: too many recipients\n");
5468 exim_exit(EXIT_FAILURE);
5473 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5474 errors_sender_rc : EXIT_FAILURE;
5479 BOOL b = allow_utf8_domains;
5480 allow_utf8_domains = TRUE;
5483 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5486 if (string_is_utf8(recipient))
5487 message_smtputf8 = TRUE;
5489 allow_utf8_domains = b;
5492 if (domain == 0 && !allow_unqualified_recipient)
5495 errmess = US"unqualified recipient address not allowed";
5498 if (recipient == NULL)
5500 if (error_handling == ERRORS_STDERR)
5502 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5503 string_printing(list[i]), errmess);
5504 exim_exit(EXIT_FAILURE);
5510 eblock.text1 = string_printing(list[i]);
5511 eblock.text2 = errmess;
5513 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5514 errors_sender_rc : EXIT_FAILURE;
5518 receive_add_recipient(recipient, -1);
5521 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5525 /* Show the recipients when debugging */
5530 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5531 if (recipients_list != NULL)
5533 debug_printf("Recipients:\n");
5534 for (i = 0; i < recipients_count; i++)
5535 debug_printf(" %s\n", recipients_list[i].address);
5539 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5540 ignored; rejecting here would just add complication, and it can just as
5541 well be done later. Allow $recipients to be visible in the ACL. */
5543 if (acl_not_smtp_start)
5545 uschar *user_msg, *log_msg;
5546 enable_dollar_recipients = TRUE;
5547 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5548 &user_msg, &log_msg);
5549 enable_dollar_recipients = FALSE;
5552 /* Pause for a while waiting for input. If none received in that time,
5553 close the logfile, if we had one open; then if we wait for a long-running
5554 datasource (months, in one use-case) log rotation will not leave us holding
5557 if (!receive_timeout)
5559 struct timeval t = { 30*60, 0 }; /* 30 minutess */
5562 FD_ZERO(&r); FD_SET(0, &r);
5563 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5566 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5567 will just read the headers for the message, and not write anything onto the
5570 message_ended = END_NOTENDED;
5571 more = receive_msg(extract_recipients);
5573 /* more is always FALSE here (not SMTP message) when reading a message
5574 for real; when reading the headers of a message for filter testing,
5575 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5577 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5578 } /* Non-SMTP message reception */
5580 /* If this is a filter testing run, there are headers in store, but
5581 no message on the spool. Run the filtering code in testing mode, setting
5582 the domain to the qualify domain and the local part to the current user,
5583 unless they have been set by options. The prefix and suffix are left unset
5584 unless specified. The the return path is set to to the sender unless it has
5585 already been set from a return-path header in the message. */
5587 if (filter_test != FTEST_NONE)
5589 deliver_domain = (ftest_domain != NULL)?
5590 ftest_domain : qualify_domain_recipient;
5591 deliver_domain_orig = deliver_domain;
5592 deliver_localpart = (ftest_localpart != NULL)?
5593 ftest_localpart : originator_login;
5594 deliver_localpart_orig = deliver_localpart;
5595 deliver_localpart_prefix = ftest_prefix;
5596 deliver_localpart_suffix = ftest_suffix;
5597 deliver_home = originator_home;
5599 if (return_path == NULL)
5601 printf("Return-path copied from sender\n");
5602 return_path = string_copy(sender_address);
5605 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5606 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5608 receive_add_recipient(
5609 string_sprintf("%s%s%s@%s",
5610 (ftest_prefix == NULL)? US"" : ftest_prefix,
5612 (ftest_suffix == NULL)? US"" : ftest_suffix,
5613 deliver_domain), -1);
5615 printf("Recipient = %s\n", recipients_list[0].address);
5616 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5617 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5619 if (chdir("/")) /* Get away from wherever the user is running this from */
5621 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5622 exim_exit(EXIT_FAILURE);
5625 /* Now we run either a system filter test, or a user filter test, or both.
5626 In the latter case, headers added by the system filter will persist and be
5627 available to the user filter. We need to copy the filter variables
5630 if ((filter_test & FTEST_SYSTEM) != 0)
5632 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5633 exim_exit(EXIT_FAILURE);
5636 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5638 if ((filter_test & FTEST_USER) != 0)
5640 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5641 exim_exit(EXIT_FAILURE);
5644 exim_exit(EXIT_SUCCESS);
5647 /* Else act on the result of message reception. We should not get here unless
5648 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5649 will be TRUE. If it is not, check on the number of messages received in this
5652 if (!session_local_queue_only &&
5653 smtp_accept_queue_per_connection > 0 &&
5654 receive_messagecount > smtp_accept_queue_per_connection)
5656 session_local_queue_only = TRUE;
5657 queue_only_reason = 2;
5660 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5661 and queue_only_load is set, check that the load average is below it. If it is
5662 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5663 default), we put the whole session into queue_only mode. It then remains this
5664 way for any subsequent messages on the same SMTP connection. This is a
5665 deliberate choice; even though the load average may fall, it doesn't seem
5666 right to deliver later messages on the same call when not delivering earlier
5667 ones. However, there are odd cases where this is not wanted, so this can be
5668 changed by setting queue_only_load_latch false. */
5670 local_queue_only = session_local_queue_only;
5671 if (!local_queue_only && queue_only_load >= 0)
5673 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5674 if (local_queue_only)
5676 queue_only_reason = 3;
5677 if (queue_only_load_latch) session_local_queue_only = TRUE;
5681 /* If running as an MUA wrapper, all queueing options and freezing options
5685 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5687 /* Log the queueing here, when it will get a message id attached, but
5688 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5691 if (local_queue_only) switch(queue_only_reason)
5694 log_write(L_delay_delivery,
5695 LOG_MAIN, "no immediate delivery: more than %d messages "
5696 "received in one connection", smtp_accept_queue_per_connection);
5700 log_write(L_delay_delivery,
5701 LOG_MAIN, "no immediate delivery: load average %.2f",
5702 (double)load_average/1000.0);
5706 /* Else do the delivery unless the ACL or local_scan() called for queue only
5707 or froze the message. Always deliver in a separate process. A fork failure is
5708 not a disaster, as the delivery will eventually happen on a subsequent queue
5709 run. The search cache must be tidied before the fork, as the parent will
5710 do it before exiting. The child will trigger a lookup failure and
5711 thereby defer the delivery if it tries to use (for example) a cached ldap
5712 connection that the parent has called unbind on. */
5714 else if (!queue_only_policy && !deliver_freeze)
5719 if ((pid = fork()) == 0)
5722 close_unwanted(); /* Close unwanted file descriptors and TLS */
5723 exim_nullstd(); /* Ensure std{in,out,err} exist */
5725 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5726 mode, deliver_drop_privilege is forced TRUE). */
5728 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5730 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5731 2, US"-Mc", message_id);
5732 /* Control does not return here. */
5735 /* No need to re-exec */
5737 rc = deliver_message(message_id, FALSE, FALSE);
5739 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5740 EXIT_SUCCESS : EXIT_FAILURE);
5745 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5746 "process: %s", strerror(errno));
5749 /* In the parent, wait if synchronous delivery is required. This will
5750 always be the case in MUA wrapper mode. */
5752 else if (synchronous_delivery)
5755 while (wait(&status) != pid);
5756 if ((status & 0x00ff) != 0)
5757 log_write(0, LOG_MAIN|LOG_PANIC,
5758 "process %d crashed with signal %d while delivering %s",
5759 (int)pid, status & 0x00ff, message_id);
5760 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5764 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5765 automatically reaps children (see comments above the loop), clear away any
5766 finished subprocesses here, in case there are lots of messages coming in
5767 from the same source. */
5769 #ifndef SIG_IGN_WORKS
5770 while (waitpid(-1, NULL, WNOHANG) > 0);
5774 exim_exit(EXIT_SUCCESS); /* Never returns */
5775 return 0; /* To stop compiler warning */