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, ...)
179 sprintf(CS process_info, "%5d ", (int)getpid());
180 len = Ustrlen(process_info);
181 va_start(ap, format);
182 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
183 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
184 len = Ustrlen(process_info);
185 process_info[len+0] = '\n';
186 process_info[len+1] = '\0';
187 process_info_len = len + 1;
188 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
195 /*************************************************
196 * Handler for SIGUSR1 *
197 *************************************************/
199 /* SIGUSR1 causes any exim process to write to the process log details of
200 what it is currently doing. It will only be used if the OS is capable of
201 setting up a handler that causes automatic restarting of any system call
202 that is in progress at the time.
204 This function takes care to be signal-safe.
206 Argument: the signal number (SIGUSR1)
211 usr1_handler(int sig)
215 os_restarting_signal(sig, usr1_handler);
217 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
220 /* If we are already running as the Exim user, try to create it in the
221 current process (assuming spool_directory exists). Otherwise, if we are
222 root, do the creation in an exim:exim subprocess. */
224 int euid = geteuid();
225 if (euid == exim_uid)
226 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
227 else if (euid == root_uid)
228 fd = log_create_as_exim(process_log_path);
231 /* If we are neither exim nor root, or if we failed to create the log file,
232 give up. There is not much useful we can do with errors, since we don't want
233 to disrupt whatever is going on outside the signal handler. */
237 (void)write(fd, process_info, process_info_len);
243 /*************************************************
245 *************************************************/
247 /* This handler is enabled most of the time that Exim is running. The handler
248 doesn't actually get used unless alarm() has been called to set a timer, to
249 place a time limit on a system call of some kind. When the handler is run, it
252 There are some other SIGALRM handlers that are used in special cases when more
253 than just a flag setting is required; for example, when reading a message's
254 input. These are normally set up in the code module that uses them, and the
255 SIGALRM handler is reset to this one afterwards.
257 Argument: the signal value (SIGALRM)
262 sigalrm_handler(int sig)
264 sig = sig; /* Keep picky compilers happy */
266 os_non_restarting_signal(SIGALRM, sigalrm_handler);
271 /*************************************************
272 * Sleep for a fractional time interval *
273 *************************************************/
275 /* This function is called by millisleep() and exim_wait_tick() to wait for a
276 period of time that may include a fraction of a second. The coding is somewhat
277 tedious. We do not expect setitimer() ever to fail, but if it does, the process
278 will wait for ever, so we panic in this instance. (There was a case of this
279 when a bug in a function that calls milliwait() caused it to pass invalid data.
280 That's when I added the check. :-)
282 We assume it to be not worth sleeping for under 100us; this value will
283 require revisiting as hardware advances. This avoids the issue of
284 a zero-valued timer setting meaning "never fire".
286 Argument: an itimerval structure containing the interval
291 milliwait(struct itimerval *itval)
294 sigset_t old_sigmask;
296 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
298 (void)sigemptyset(&sigmask); /* Empty mask */
299 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
300 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
301 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
302 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
303 "setitimer() failed: %s", strerror(errno));
304 (void)sigfillset(&sigmask); /* All signals */
305 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
306 (void)sigsuspend(&sigmask); /* Until SIGALRM */
307 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
313 /*************************************************
314 * Millisecond sleep function *
315 *************************************************/
317 /* The basic sleep() function has a granularity of 1 second, which is too rough
318 in some cases - for example, when using an increasing delay to slow down
321 Argument: number of millseconds
328 struct itimerval itval;
329 itval.it_interval.tv_sec = 0;
330 itval.it_interval.tv_usec = 0;
331 itval.it_value.tv_sec = msec/1000;
332 itval.it_value.tv_usec = (msec % 1000) * 1000;
338 /*************************************************
339 * Compare microsecond times *
340 *************************************************/
347 Returns: -1, 0, or +1
351 exim_tvcmp(struct timeval *t1, struct timeval *t2)
353 if (t1->tv_sec > t2->tv_sec) return +1;
354 if (t1->tv_sec < t2->tv_sec) return -1;
355 if (t1->tv_usec > t2->tv_usec) return +1;
356 if (t1->tv_usec < t2->tv_usec) return -1;
363 /*************************************************
364 * Clock tick wait function *
365 *************************************************/
367 /* Exim uses a time + a pid to generate a unique identifier in two places: its
368 message IDs, and in file names for maildir deliveries. Because some OS now
369 re-use pids within the same second, sub-second times are now being used.
370 However, for absolute certaintly, we must ensure the clock has ticked before
371 allowing the relevant process to complete. At the time of implementation of
372 this code (February 2003), the speed of processors is such that the clock will
373 invariably have ticked already by the time a process has done its job. This
374 function prepares for the time when things are faster - and it also copes with
375 clocks that go backwards.
378 then_tv A timeval which was used to create uniqueness; its usec field
379 has been rounded down to the value of the resolution.
380 We want to be sure the current time is greater than this.
381 resolution The resolution that was used to divide the microseconds
382 (1 for maildir, larger for message ids)
388 exim_wait_tick(struct timeval *then_tv, int resolution)
390 struct timeval now_tv;
391 long int now_true_usec;
393 (void)gettimeofday(&now_tv, NULL);
394 now_true_usec = now_tv.tv_usec;
395 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
397 if (exim_tvcmp(&now_tv, then_tv) <= 0)
399 struct itimerval itval;
400 itval.it_interval.tv_sec = 0;
401 itval.it_interval.tv_usec = 0;
402 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
403 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
405 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
406 negative value for the microseconds is possible only in the case when "now"
407 is more than a second less than "then". That means that itval.it_value.tv_sec
408 is greater than zero. The following correction is therefore safe. */
410 if (itval.it_value.tv_usec < 0)
412 itval.it_value.tv_usec += 1000000;
413 itval.it_value.tv_sec -= 1;
416 DEBUG(D_transport|D_receive)
418 if (!running_in_test_harness)
420 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
421 then_tv->tv_sec, (long) then_tv->tv_usec,
422 now_tv.tv_sec, (long) now_tv.tv_usec);
423 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
424 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
435 /*************************************************
436 * Call fopen() with umask 777 and adjust mode *
437 *************************************************/
439 /* Exim runs with umask(0) so that files created with open() have the mode that
440 is specified in the open() call. However, there are some files, typically in
441 the spool directory, that are created with fopen(). They end up world-writeable
442 if no precautions are taken. Although the spool directory is not accessible to
443 the world, this is an untidiness. So this is a wrapper function for fopen()
444 that sorts out the mode of the created file.
447 filename the file name
448 options the fopen() options
449 mode the required mode
451 Returns: the fopened FILE or NULL
455 modefopen(const uschar *filename, const char *options, mode_t mode)
457 mode_t saved_umask = umask(0777);
458 FILE *f = Ufopen(filename, options);
459 (void)umask(saved_umask);
460 if (f != NULL) (void)fchmod(fileno(f), mode);
467 /*************************************************
468 * Ensure stdin, stdout, and stderr exist *
469 *************************************************/
471 /* Some operating systems grumble if an exec() happens without a standard
472 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
473 file will be opened and will use these fd values, and then some other bit of
474 code will assume, for example, that it can write error messages to stderr.
475 This function ensures that fds 0, 1, and 2 are open if they do not already
476 exist, by connecting them to /dev/null.
478 This function is also used to ensure that std{in,out,err} exist at all times,
479 so that if any library that Exim calls tries to use them, it doesn't crash.
491 for (i = 0; i <= 2; i++)
493 if (fstat(i, &statbuf) < 0 && errno == EBADF)
495 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
496 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
497 string_open_failed(errno, "/dev/null"));
498 if (devnull != i) (void)dup2(devnull, i);
501 if (devnull > 2) (void)close(devnull);
507 /*************************************************
508 * Close unwanted file descriptors for delivery *
509 *************************************************/
511 /* This function is called from a new process that has been forked to deliver
512 an incoming message, either directly, or using exec.
514 We want any smtp input streams to be closed in this new process. However, it
515 has been observed that using fclose() here causes trouble. When reading in -bS
516 input, duplicate copies of messages have been seen. The files will be sharing a
517 file pointer with the parent process, and it seems that fclose() (at least on
518 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
519 least sometimes. Hence we go for closing the underlying file descriptors.
521 If TLS is active, we want to shut down the TLS library, but without molesting
522 the parent's SSL connection.
524 For delivery of a non-SMTP message, we want to close stdin and stdout (and
525 stderr unless debugging) because the calling process might have set them up as
526 pipes and be waiting for them to close before it waits for the submission
527 process to terminate. If they aren't closed, they hold up the calling process
528 until the initial delivery process finishes, which is not what we want.
530 Exception: We do want it for synchronous delivery!
532 And notwithstanding all the above, if D_resolver is set, implying resolver
533 debugging, leave stdout open, because that's where the resolver writes its
536 When we close stderr (which implies we've also closed stdout), we also get rid
537 of any controlling terminal.
549 tls_close(TRUE, FALSE); /* Shut down the TLS library */
551 (void)close(fileno(smtp_in));
552 (void)close(fileno(smtp_out));
557 (void)close(0); /* stdin */
558 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
559 if (debug_selector == 0) /* stderr */
561 if (!synchronous_delivery)
574 /*************************************************
576 *************************************************/
578 /* This function sets a new uid and gid permanently, optionally calling
579 initgroups() to set auxiliary groups. There are some special cases when running
580 Exim in unprivileged modes. In these situations the effective uid will not be
581 root; if we already have the right effective uid/gid, and don't need to
582 initialize any groups, leave things as they are.
587 igflag TRUE if initgroups() wanted
588 msg text to use in debugging output and failure log
590 Returns: nothing; bombs out on failure
594 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
596 uid_t euid = geteuid();
597 gid_t egid = getegid();
599 if (euid == root_uid || euid != uid || egid != gid || igflag)
601 /* At least one OS returns +1 for initgroups failure, so just check for
606 struct passwd *pw = getpwuid(uid);
609 if (initgroups(pw->pw_name, gid) != 0)
610 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
611 (long int)uid, strerror(errno));
613 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
614 "no passwd entry for uid=%ld", (long int)uid);
617 if (setgid(gid) < 0 || setuid(uid) < 0)
619 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
620 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
624 /* Debugging output included uid/gid and all groups */
628 int group_count, save_errno;
629 gid_t group_list[NGROUPS_MAX];
630 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
631 (long int)geteuid(), (long int)getegid(), (long int)getpid());
632 group_count = getgroups(NGROUPS_MAX, group_list);
634 debug_printf(" auxiliary group list:");
638 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
640 else if (group_count < 0)
641 debug_printf(" <error: %s>", strerror(save_errno));
642 else debug_printf(" <none>");
650 /*************************************************
652 *************************************************/
654 /* Exim exits via this function so that it always clears up any open
660 Returns: does not return
668 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
669 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
676 /*************************************************
677 * Extract port from host address *
678 *************************************************/
680 /* Called to extract the port from the values given to -oMa and -oMi.
681 It also checks the syntax of the address, and terminates it before the
682 port data when a port is extracted.
685 address the address, with possible port on the end
687 Returns: the port, or zero if there isn't one
688 bombs out on a syntax error
692 check_port(uschar *address)
694 int port = host_address_extract_port(address);
695 if (string_is_ip_address(address, NULL) == 0)
697 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
705 /*************************************************
706 * Test/verify an address *
707 *************************************************/
709 /* This function is called by the -bv and -bt code. It extracts a working
710 address from a full RFC 822 address. This isn't really necessary per se, but it
711 has the effect of collapsing source routes.
715 flags flag bits for verify_address()
716 exit_value to be set for failures
722 test_address(uschar *s, int flags, int *exit_value)
724 int start, end, domain;
725 uschar *parse_error = NULL;
726 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
730 fprintf(stdout, "syntax error: %s\n", parse_error);
735 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
736 -1, -1, NULL, NULL, NULL);
737 if (rc == FAIL) *exit_value = 2;
738 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
744 /*************************************************
745 * Show supported features *
746 *************************************************/
748 /* This function is called for -bV/--version and for -d to output the optional
749 features of the current Exim binary.
751 Arguments: a FILE for printing
756 show_whats_supported(FILE *f)
760 #ifdef DB_VERSION_STRING
761 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
762 #elif defined(BTREEVERSION) && defined(HASHVERSION)
764 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
766 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
768 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
769 fprintf(f, "Probably ndbm\n");
770 #elif defined(USE_TDB)
771 fprintf(f, "Using tdb\n");
774 fprintf(f, "Probably GDBM (native mode)\n");
776 fprintf(f, "Probably GDBM (compatibility mode)\n");
780 fprintf(f, "Support for:");
781 #ifdef SUPPORT_CRYPTEQ
782 fprintf(f, " crypteq");
785 fprintf(f, " iconv()");
790 #ifdef HAVE_SETCLASSRESOURCES
791 fprintf(f, " use_setclassresources");
800 fprintf(f, " Expand_dlfunc");
802 #ifdef USE_TCP_WRAPPERS
803 fprintf(f, " TCPwrappers");
807 fprintf(f, " GnuTLS");
809 fprintf(f, " OpenSSL");
812 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
813 fprintf(f, " translate_ip_address");
815 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
816 fprintf(f, " move_frozen_messages");
818 #ifdef WITH_CONTENT_SCAN
819 fprintf(f, " Content_Scanning");
824 #ifndef DISABLE_DNSSEC
825 fprintf(f, " DNSSEC");
827 #ifndef DISABLE_EVENT
828 fprintf(f, " Event");
840 fprintf(f, " PROXY");
843 fprintf(f, " SOCKS");
845 #ifdef EXPERIMENTAL_SPF
846 fprintf(f, " Experimental_SPF");
848 #ifdef EXPERIMENTAL_SRS
849 fprintf(f, " Experimental_SRS");
851 #ifdef EXPERIMENTAL_BRIGHTMAIL
852 fprintf(f, " Experimental_Brightmail");
854 #ifdef EXPERIMENTAL_DANE
855 fprintf(f, " Experimental_DANE");
857 #ifdef EXPERIMENTAL_DCC
858 fprintf(f, " Experimental_DCC");
860 #ifdef EXPERIMENTAL_DMARC
861 fprintf(f, " Experimental_DMARC");
863 #ifdef EXPERIMENTAL_DSN_INFO
864 fprintf(f, " Experimental_DSN_info");
868 fprintf(f, "Lookups (built-in):");
869 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
870 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
872 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
875 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
876 fprintf(f, " dbm dbmjz dbmnz");
878 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
879 fprintf(f, " dnsdb");
881 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
882 fprintf(f, " dsearch");
884 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
885 fprintf(f, " ibase");
887 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
888 fprintf(f, " ldap ldapdn ldapm");
890 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
891 fprintf(f, " mysql");
893 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
894 fprintf(f, " nis nis0");
896 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
897 fprintf(f, " nisplus");
899 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
900 fprintf(f, " oracle");
902 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
903 fprintf(f, " passwd");
905 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
906 fprintf(f, " pgsql");
908 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
909 fprintf(f, " redis");
911 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
912 fprintf(f, " sqlite");
914 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
915 fprintf(f, " testdb");
917 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
918 fprintf(f, " whoson");
922 fprintf(f, "Authenticators:");
924 fprintf(f, " cram_md5");
926 #ifdef AUTH_CYRUS_SASL
927 fprintf(f, " cyrus_sasl");
930 fprintf(f, " dovecot");
933 fprintf(f, " gsasl");
935 #ifdef AUTH_HEIMDAL_GSSAPI
936 fprintf(f, " heimdal_gssapi");
938 #ifdef AUTH_PLAINTEXT
939 fprintf(f, " plaintext");
949 fprintf(f, "Routers:");
951 fprintf(f, " accept");
953 #ifdef ROUTER_DNSLOOKUP
954 fprintf(f, " dnslookup");
956 #ifdef ROUTER_IPLITERAL
957 fprintf(f, " ipliteral");
959 #ifdef ROUTER_IPLOOKUP
960 fprintf(f, " iplookup");
962 #ifdef ROUTER_MANUALROUTE
963 fprintf(f, " manualroute");
965 #ifdef ROUTER_QUERYPROGRAM
966 fprintf(f, " queryprogram");
968 #ifdef ROUTER_REDIRECT
969 fprintf(f, " redirect");
973 fprintf(f, "Transports:");
974 #ifdef TRANSPORT_APPENDFILE
975 fprintf(f, " appendfile");
976 #ifdef SUPPORT_MAILDIR
977 fprintf(f, "/maildir");
979 #ifdef SUPPORT_MAILSTORE
980 fprintf(f, "/mailstore");
986 #ifdef TRANSPORT_AUTOREPLY
987 fprintf(f, " autoreply");
989 #ifdef TRANSPORT_LMTP
992 #ifdef TRANSPORT_PIPE
995 #ifdef TRANSPORT_SMTP
1000 if (fixed_never_users[0] > 0)
1003 fprintf(f, "Fixed never_users: ");
1004 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1005 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1006 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1009 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1011 /* Everything else is details which are only worth reporting when debugging.
1012 Perhaps the tls_version_report should move into this too. */
1017 /* clang defines __GNUC__ (at least, for me) so test for it first */
1018 #if defined(__clang__)
1019 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1020 #elif defined(__GNUC__)
1021 fprintf(f, "Compiler: GCC [%s]\n",
1025 "? unknown version ?"
1029 fprintf(f, "Compiler: <unknown>\n");
1033 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1034 __GLIBC__, __GLIBC_MINOR__);
1035 if (__GLIBC_PREREQ(2, 1))
1036 fprintf(f, " Runtime: %s\n",
1037 gnu_get_libc_version());
1041 tls_version_report(f);
1044 utf8_version_report(f);
1047 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1048 if (authi->version_report)
1049 (*authi->version_report)(f);
1051 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1052 characters; unless it's an ancient version of PCRE in which case it
1054 #ifndef PCRE_PRERELEASE
1055 # define PCRE_PRERELEASE
1058 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1059 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1061 PCRE_MAJOR, PCRE_MINOR,
1062 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1065 #undef EXPAND_AND_QUOTE
1068 for (i = 0; i < lookup_list_count; i++)
1069 if (lookup_list[i]->version_report)
1070 lookup_list[i]->version_report(f);
1072 #ifdef WHITELIST_D_MACROS
1073 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1075 fprintf(f, "WHITELIST_D_MACROS unset\n");
1077 #ifdef TRUSTED_CONFIG_LIST
1078 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1080 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1087 /*************************************************
1088 * Show auxiliary information about Exim *
1089 *************************************************/
1092 show_exim_information(enum commandline_info request, FILE *stream)
1099 fprintf(stream, "Oops, something went wrong.\n");
1103 "The -bI: flag takes a string indicating which information to provide.\n"
1104 "If the string is not recognised, you'll get this help (on stderr).\n"
1106 " exim -bI:help this information\n"
1107 " exim -bI:dscp dscp value keywords known\n"
1108 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1112 for (pp = exim_sieve_extension_list; *pp; ++pp)
1113 fprintf(stream, "%s\n", *pp);
1116 dscp_list_to_stream(stream);
1122 /*************************************************
1123 * Quote a local part *
1124 *************************************************/
1126 /* This function is used when a sender address or a From: or Sender: header
1127 line is being created from the caller's login, or from an authenticated_id. It
1128 applies appropriate quoting rules for a local part.
1130 Argument: the local part
1131 Returns: the local part, quoted if necessary
1135 local_part_quote(uschar *lpart)
1137 BOOL needs_quote = FALSE;
1142 for (t = lpart; !needs_quote && *t != 0; t++)
1144 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1145 (*t != '.' || t == lpart || t[1] == 0);
1148 if (!needs_quote) return lpart;
1151 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1155 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1158 yield = string_cat(yield, &size, &ptr, lpart);
1161 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1162 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1163 yield = string_catn(yield, &size, &ptr, nq, 1);
1167 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1175 /*************************************************
1176 * Load readline() functions *
1177 *************************************************/
1179 /* This function is called from testing executions that read data from stdin,
1180 but only when running as the calling user. Currently, only -be does this. The
1181 function loads the readline() function library and passes back the functions.
1182 On some systems, it needs the curses library, so load that too, but try without
1183 it if loading fails. All this functionality has to be requested at build time.
1186 fn_readline_ptr pointer to where to put the readline pointer
1187 fn_addhist_ptr pointer to where to put the addhistory function
1189 Returns: the dlopen handle or NULL on failure
1193 set_readline(char * (**fn_readline_ptr)(const char *),
1194 void (**fn_addhist_ptr)(const char *))
1197 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1199 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1200 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1202 if (dlhandle != NULL)
1204 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1205 * char * readline (const char *prompt);
1206 * void add_history (const char *string);
1208 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1209 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1213 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1222 /*************************************************
1223 * Get a line from stdin for testing things *
1224 *************************************************/
1226 /* This function is called when running tests that can take a number of lines
1227 of input (for example, -be and -bt). It handles continuations and trailing
1228 spaces. And prompting and a blank line output on eof. If readline() is in use,
1229 the arguments are non-NULL and provide the relevant functions.
1232 fn_readline readline function or NULL
1233 fn_addhist addhist function or NULL
1235 Returns: pointer to dynamic memory, or NULL at end of file
1239 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1244 uschar *yield = NULL;
1246 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1250 uschar buffer[1024];
1254 char *readline_line = NULL;
1255 if (fn_readline != NULL)
1257 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1258 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1259 p = US readline_line;
1264 /* readline() not in use */
1267 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1271 /* Handle the line */
1273 ss = p + (int)Ustrlen(p);
1274 while (ss > p && isspace(ss[-1])) ss--;
1278 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1281 yield = string_catn(yield, &size, &ptr, p, ss - p);
1284 if (fn_readline != NULL) free(readline_line);
1287 /* yield can only be NULL if ss==p */
1288 if (ss == p || yield[ptr-1] != '\\')
1290 if (yield) yield[ptr] = 0;
1296 if (yield == NULL) printf("\n");
1302 /*************************************************
1303 * Output usage information for the program *
1304 *************************************************/
1306 /* This function is called when there are no recipients
1307 or a specific --help argument was added.
1310 progname information on what name we were called by
1312 Returns: DOES NOT RETURN
1316 exim_usage(uschar *progname)
1319 /* Handle specific program invocation varients */
1320 if (Ustrcmp(progname, US"-mailq") == 0)
1323 "mailq - list the contents of the mail queue\n\n"
1324 "For a list of options, see the Exim documentation.\n");
1328 /* Generic usage - we output this whatever happens */
1330 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1331 "not directly from a shell command line. Options and/or arguments control\n"
1332 "what it does when called. For a list of options, see the Exim documentation.\n");
1339 /*************************************************
1340 * Validate that the macros given are okay *
1341 *************************************************/
1343 /* Typically, Exim will drop privileges if macros are supplied. In some
1344 cases, we want to not do so.
1346 Arguments: none (macros is a global)
1347 Returns: true if trusted, false otherwise
1351 macros_trusted(void)
1353 #ifdef WHITELIST_D_MACROS
1355 uschar *whitelisted, *end, *p, **whites, **w;
1356 int white_count, i, n;
1358 BOOL prev_char_item, found;
1363 #ifndef WHITELIST_D_MACROS
1367 /* We only trust -D overrides for some invoking users:
1368 root, the exim run-time user, the optional config owner user.
1369 I don't know why config-owner would be needed, but since they can own the
1370 config files anyway, there's no security risk to letting them override -D. */
1371 if ( ! ((real_uid == root_uid)
1372 || (real_uid == exim_uid)
1373 #ifdef CONFIGURE_OWNER
1374 || (real_uid == config_uid)
1378 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1382 /* Get a list of macros which are whitelisted */
1383 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1384 prev_char_item = FALSE;
1386 for (p = whitelisted; *p != '\0'; ++p)
1388 if (*p == ':' || isspace(*p))
1393 prev_char_item = FALSE;
1396 if (!prev_char_item)
1397 prev_char_item = TRUE;
1404 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1405 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1410 if (i == white_count)
1412 while (*p != '\0' && p < end)
1418 /* The list of macros should be very short. Accept the N*M complexity. */
1419 for (m = macros; m != NULL; m = m->next)
1422 for (w = whites; *w; ++w)
1423 if (Ustrcmp(*w, m->name) == 0)
1430 if (m->replacement == NULL)
1432 len = Ustrlen(m->replacement);
1435 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1436 0, PCRE_EOPT, NULL, 0);
1439 if (n != PCRE_ERROR_NOMATCH)
1440 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1444 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1450 /*************************************************
1451 * Entry point and high-level code *
1452 *************************************************/
1454 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1455 the appropriate action. All the necessary functions are present in the one
1456 binary. I originally thought one should split it up, but it turns out that so
1457 much of the apparatus is needed in each chunk that one might as well just have
1458 it all available all the time, which then makes the coding easier as well.
1461 argc count of entries in argv
1462 argv argument strings, with argv[0] being the program name
1464 Returns: EXIT_SUCCESS if terminated successfully
1465 EXIT_FAILURE otherwise, except when a message has been sent
1466 to the sender, and -oee was given
1470 main(int argc, char **cargv)
1472 uschar **argv = USS cargv;
1473 int arg_receive_timeout = -1;
1474 int arg_smtp_receive_timeout = -1;
1475 int arg_error_handling = error_handling;
1476 int filter_sfd = -1;
1477 int filter_ufd = -1;
1480 int list_queue_option = 0;
1482 int msg_action_arg = -1;
1483 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1484 int queue_only_reason = 0;
1486 int perl_start_option = 0;
1488 int recipients_arg = argc;
1489 int sender_address_domain = 0;
1490 int test_retry_arg = -1;
1491 int test_rewrite_arg = -1;
1492 BOOL arg_queue_only = FALSE;
1493 BOOL bi_option = FALSE;
1494 BOOL checking = FALSE;
1495 BOOL count_queue = FALSE;
1496 BOOL expansion_test = FALSE;
1497 BOOL extract_recipients = FALSE;
1498 BOOL flag_G = FALSE;
1499 BOOL flag_n = FALSE;
1500 BOOL forced_delivery = FALSE;
1501 BOOL f_end_dot = FALSE;
1502 BOOL deliver_give_up = FALSE;
1503 BOOL list_queue = FALSE;
1504 BOOL list_options = FALSE;
1505 BOOL list_config = FALSE;
1506 BOOL local_queue_only;
1508 BOOL one_msg_action = FALSE;
1509 BOOL queue_only_set = FALSE;
1510 BOOL receiving_message = TRUE;
1511 BOOL sender_ident_set = FALSE;
1512 BOOL session_local_queue_only;
1514 BOOL removed_privilege = FALSE;
1515 BOOL usage_wanted = FALSE;
1516 BOOL verify_address_mode = FALSE;
1517 BOOL verify_as_sender = FALSE;
1518 BOOL version_printed = FALSE;
1519 uschar *alias_arg = NULL;
1520 uschar *called_as = US"";
1521 uschar *cmdline_syslog_name = NULL;
1522 uschar *start_queue_run_id = NULL;
1523 uschar *stop_queue_run_id = NULL;
1524 uschar *expansion_test_message = NULL;
1525 uschar *ftest_domain = NULL;
1526 uschar *ftest_localpart = NULL;
1527 uschar *ftest_prefix = NULL;
1528 uschar *ftest_suffix = NULL;
1529 uschar *log_oneline = NULL;
1530 uschar *malware_test_file = NULL;
1531 uschar *real_sender_address;
1532 uschar *originator_home = US"/";
1537 struct stat statbuf;
1538 pid_t passed_qr_pid = (pid_t)0;
1539 int passed_qr_pipe = -1;
1540 gid_t group_list[NGROUPS_MAX];
1542 /* For the -bI: flag */
1543 enum commandline_info info_flag = CMDINFO_NONE;
1544 BOOL info_stdout = FALSE;
1546 /* Possible options for -R and -S */
1548 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1550 /* Need to define this in case we need to change the environment in order
1551 to get rid of a bogus time zone. We have to make it char rather than uschar
1552 because some OS define it in /usr/include/unistd.h. */
1554 extern char **environ;
1556 /* If the Exim user and/or group and/or the configuration file owner/group were
1557 defined by ref:name at build time, we must now find the actual uid/gid values.
1558 This is a feature to make the lives of binary distributors easier. */
1560 #ifdef EXIM_USERNAME
1561 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1565 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1569 /* If ref:name uses a number as the name, route_finduser() returns
1570 TRUE with exim_uid set and pw coerced to NULL. */
1572 exim_gid = pw->pw_gid;
1573 #ifndef EXIM_GROUPNAME
1577 "exim: ref:name should specify a usercode, not a group.\n"
1578 "exim: can't let you get away with it unless you also specify a group.\n");
1585 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1591 #ifdef EXIM_GROUPNAME
1592 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1594 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1600 #ifdef CONFIGURE_OWNERNAME
1601 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1603 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1604 CONFIGURE_OWNERNAME);
1609 /* We default the system_filter_user to be the Exim run-time user, as a
1610 sane non-root value. */
1611 system_filter_uid = exim_uid;
1613 #ifdef CONFIGURE_GROUPNAME
1614 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1616 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1617 CONFIGURE_GROUPNAME);
1622 /* In the Cygwin environment, some initialization used to need doing.
1623 It was fudged in by means of this macro; now no longer but we'll leave
1624 it in case of others. */
1630 /* Check a field which is patched when we are running Exim within its
1631 testing harness; do a fast initial check, and then the whole thing. */
1633 running_in_test_harness =
1634 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1636 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1637 at the start of a program; however, it seems that some environments do not
1638 follow this. A "strange" locale can affect the formatting of timestamps, so we
1641 setlocale(LC_ALL, "C");
1643 /* Set up the default handler for timing using alarm(). */
1645 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1647 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1648 because store_malloc writes a log entry on failure. */
1650 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1651 if (log_buffer == NULL)
1653 fprintf(stderr, "exim: failed to get store for log buffer\n");
1657 /* Initialize the default log options. */
1659 bits_set(log_selector, log_selector_size, log_default);
1661 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1662 NULL when the daemon is run and the file is closed. We have to use this
1663 indirection, because some systems don't allow writing to the variable "stderr".
1666 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1668 /* Arrange for the PCRE regex library to use our store functions. Note that
1669 the normal calls are actually macros that add additional arguments for
1670 debugging purposes so we have to assign specially constructed functions here.
1671 The default is to use store in the stacking pool, but this is overridden in the
1672 regex_must_compile() function. */
1674 pcre_malloc = function_store_get;
1675 pcre_free = function_dummy_free;
1677 /* Ensure there is a big buffer for temporary use in several places. It is put
1678 in malloc store so that it can be freed for enlargement if necessary. */
1680 big_buffer = store_malloc(big_buffer_size);
1682 /* Set up the handler for the data request signal, and set the initial
1683 descriptive text. */
1685 set_process_info("initializing");
1686 os_restarting_signal(SIGUSR1, usr1_handler);
1688 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1689 in the daemon code. For the rest of Exim's uses, we ignore it. */
1691 signal(SIGHUP, SIG_IGN);
1693 /* We don't want to die on pipe errors as the code is written to handle
1694 the write error instead. */
1696 signal(SIGPIPE, SIG_IGN);
1698 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1699 set to SIG_IGN. This causes subprocesses that complete before the parent
1700 process waits for them not to hang around, so when Exim calls wait(), nothing
1701 is there. The wait() code has been made robust against this, but let's ensure
1702 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1703 ending status. We use sigaction rather than plain signal() on those OS where
1704 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1705 problem on AIX with this.) */
1709 struct sigaction act;
1710 act.sa_handler = SIG_DFL;
1711 sigemptyset(&(act.sa_mask));
1713 sigaction(SIGCHLD, &act, NULL);
1716 signal(SIGCHLD, SIG_DFL);
1719 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1724 /* Set up the version number. Set up the leading 'E' for the external form of
1725 message ids, set the pointer to the internal form, and initialize it to
1726 indicate no message being processed. */
1729 message_id_option[0] = '-';
1730 message_id_external = message_id_option + 1;
1731 message_id_external[0] = 'E';
1732 message_id = message_id_external + 1;
1735 /* Set the umask to zero so that any files Exim creates using open() are
1736 created with the modes that it specifies. NOTE: Files created with fopen() have
1737 a problem, which was not recognized till rather late (February 2006). With this
1738 umask, such files will be world writeable. (They are all content scanning files
1739 in the spool directory, which isn't world-accessible, so this is not a
1740 disaster, but it's untidy.) I don't want to change this overall setting,
1741 however, because it will interact badly with the open() calls. Instead, there's
1742 now a function called modefopen() that fiddles with the umask while calling
1747 /* Precompile the regular expression for matching a message id. Keep this in
1748 step with the code that generates ids in the accept.c module. We need to do
1749 this here, because the -M options check their arguments for syntactic validity
1750 using mac_ismsgid, which uses this. */
1753 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1755 /* Precompile the regular expression that is used for matching an SMTP error
1756 code, possibly extended, at the start of an error message. Note that the
1757 terminating whitespace character is included. */
1760 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1763 #ifdef WHITELIST_D_MACROS
1764 /* Precompile the regular expression used to filter the content of macros
1765 given to -D for permissibility. */
1767 regex_whitelisted_macro =
1768 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1771 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1773 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1774 this seems to be a generally accepted convention, since one finds symbolic
1775 links called "mailq" in standard OS configurations. */
1777 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1778 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1781 receiving_message = FALSE;
1782 called_as = US"-mailq";
1785 /* If the program is called as "rmail" treat it as equivalent to
1786 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1787 i.e. preventing a single dot on a line from terminating the message, and
1788 returning with zero return code, even in cases of error (provided an error
1789 message has been sent). */
1791 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1792 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1795 called_as = US"-rmail";
1796 errors_sender_rc = EXIT_SUCCESS;
1799 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1800 this is a smail convention. */
1802 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1803 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1805 smtp_input = smtp_batched_input = TRUE;
1806 called_as = US"-rsmtp";
1809 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1810 this is a smail convention. */
1812 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1813 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1816 receiving_message = FALSE;
1817 called_as = US"-runq";
1820 /* If the program is called as "newaliases" treat it as equivalent to
1821 "exim -bi"; this is a sendmail convention. */
1823 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1824 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1827 receiving_message = FALSE;
1828 called_as = US"-newaliases";
1831 /* Save the original effective uid for a couple of uses later. It should
1832 normally be root, but in some esoteric environments it may not be. */
1834 original_euid = geteuid();
1836 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1837 to be the same as the real ones. This makes a difference only if Exim is setuid
1838 (or setgid) to something other than root, which could be the case in some
1839 special configurations. */
1841 real_uid = getuid();
1842 real_gid = getgid();
1844 if (real_uid == root_uid)
1846 rv = setgid(real_gid);
1849 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1850 (long int)real_gid, strerror(errno));
1853 rv = setuid(real_uid);
1856 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1857 (long int)real_uid, strerror(errno));
1862 /* If neither the original real uid nor the original euid was root, Exim is
1863 running in an unprivileged state. */
1865 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1867 /* Scan the program's arguments. Some can be dealt with right away; others are
1868 simply recorded for checking and handling afterwards. Do a high-level switch
1869 on the second character (the one after '-'), to save some effort. */
1871 for (i = 1; i < argc; i++)
1873 BOOL badarg = FALSE;
1874 uschar *arg = argv[i];
1878 /* An argument not starting with '-' is the start of a recipients list;
1879 break out of the options-scanning loop. */
1887 /* An option consistion of -- terminates the options */
1889 if (Ustrcmp(arg, "--") == 0)
1891 recipients_arg = i + 1;
1895 /* Handle flagged options */
1897 switchchar = arg[1];
1900 /* Make all -ex options synonymous with -oex arguments, since that
1901 is assumed by various callers. Also make -qR options synonymous with -R
1902 options, as that seems to be required as well. Allow for -qqR too, and
1903 the same for -S options. */
1905 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1906 Ustrncmp(arg+1, "qR", 2) == 0 ||
1907 Ustrncmp(arg+1, "qS", 2) == 0)
1909 switchchar = arg[2];
1912 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1914 switchchar = arg[3];
1916 queue_2stage = TRUE;
1919 /* Make -r synonymous with -f, since it is a documented alias */
1921 else if (arg[1] == 'r') switchchar = 'f';
1923 /* Make -ov synonymous with -v */
1925 else if (Ustrcmp(arg, "-ov") == 0)
1931 /* deal with --option_aliases */
1932 else if (switchchar == '-')
1934 if (Ustrcmp(argrest, "help") == 0)
1936 usage_wanted = TRUE;
1939 else if (Ustrcmp(argrest, "version") == 0)
1946 /* High-level switch on active initial letter */
1951 /* sendmail uses -Ac and -Am to control which .cf file is used;
1954 if (*argrest == '\0') { badarg = TRUE; break; }
1957 BOOL ignore = FALSE;
1962 if (*(argrest + 1) == '\0')
1966 if (!ignore) { badarg = TRUE; break; }
1970 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1971 so has no need of it. */
1974 if (*argrest == 0) i++; /* Skip over the type */
1979 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1981 /* -bd: Run in daemon mode, awaiting SMTP connections.
1982 -bdf: Ditto, but in the foreground.
1985 if (*argrest == 'd')
1987 daemon_listen = TRUE;
1988 if (*(++argrest) == 'f') background_daemon = FALSE;
1989 else if (*argrest != 0) { badarg = TRUE; break; }
1992 /* -be: Run in expansion test mode
1993 -bem: Ditto, but read a message from a file first
1996 else if (*argrest == 'e')
1998 expansion_test = checking = TRUE;
1999 if (argrest[1] == 'm')
2001 if (++i >= argc) { badarg = TRUE; break; }
2002 expansion_test_message = argv[i];
2005 if (argrest[1] != 0) { badarg = TRUE; break; }
2008 /* -bF: Run system filter test */
2010 else if (*argrest == 'F')
2012 filter_test |= checking = FTEST_SYSTEM;
2013 if (*(++argrest) != 0) { badarg = TRUE; break; }
2014 if (++i < argc) filter_test_sfile = argv[i]; else
2016 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2021 /* -bf: Run user filter test
2022 -bfd: Set domain for filter testing
2023 -bfl: Set local part for filter testing
2024 -bfp: Set prefix for filter testing
2025 -bfs: Set suffix for filter testing
2028 else if (*argrest == 'f')
2030 if (*(++argrest) == 0)
2032 filter_test |= checking = FTEST_USER;
2033 if (++i < argc) filter_test_ufile = argv[i]; else
2035 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2043 fprintf(stderr, "exim: string expected after %s\n", arg);
2046 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2047 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2048 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2049 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2050 else { badarg = TRUE; break; }
2054 /* -bh: Host checking - an IP address must follow. */
2056 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2058 if (++i >= argc) { badarg = TRUE; break; }
2059 sender_host_address = argv[i];
2060 host_checking = checking = log_testing_mode = TRUE;
2061 host_checking_callout = argrest[1] == 'c';
2062 message_logs = FALSE;
2065 /* -bi: This option is used by sendmail to initialize *the* alias file,
2066 though it has the -oA option to specify a different file. Exim has no
2067 concept of *the* alias file, but since Sun's YP make script calls
2068 sendmail this way, some support must be provided. */
2070 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2072 /* -bI: provide information, of the type to follow after a colon.
2073 This is an Exim flag. */
2075 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2077 uschar *p = &argrest[2];
2078 info_flag = CMDINFO_HELP;
2081 if (strcmpic(p, CUS"sieve") == 0)
2083 info_flag = CMDINFO_SIEVE;
2086 else if (strcmpic(p, CUS"dscp") == 0)
2088 info_flag = CMDINFO_DSCP;
2091 else if (strcmpic(p, CUS"help") == 0)
2098 /* -bm: Accept and deliver message - the default option. Reinstate
2099 receiving_message, which got turned off for all -b options. */
2101 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2103 /* -bmalware: test the filename given for malware */
2105 else if (Ustrcmp(argrest, "malware") == 0)
2107 if (++i >= argc) { badarg = TRUE; break; }
2109 malware_test_file = argv[i];
2112 /* -bnq: For locally originating messages, do not qualify unqualified
2113 addresses. In the envelope, this causes errors; in header lines they
2116 else if (Ustrcmp(argrest, "nq") == 0)
2118 allow_unqualified_sender = FALSE;
2119 allow_unqualified_recipient = FALSE;
2122 /* -bpxx: List the contents of the mail queue, in various forms. If
2123 the option is -bpc, just a queue count is needed. Otherwise, if the
2124 first letter after p is r, then order is random. */
2126 else if (*argrest == 'p')
2128 if (*(++argrest) == 'c')
2131 if (*(++argrest) != 0) badarg = TRUE;
2135 if (*argrest == 'r')
2137 list_queue_option = 8;
2140 else list_queue_option = 0;
2144 /* -bp: List the contents of the mail queue, top-level only */
2146 if (*argrest == 0) {}
2148 /* -bpu: List the contents of the mail queue, top-level undelivered */
2150 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2152 /* -bpa: List the contents of the mail queue, including all delivered */
2154 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2156 /* Unknown after -bp[r] */
2166 /* -bP: List the configuration variables given as the address list.
2167 Force -v, so configuration errors get displayed. */
2169 else if (Ustrcmp(argrest, "P") == 0)
2171 /* -bP config: we need to setup here, because later,
2172 * when list_options is checked, the config is read already */
2173 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2176 readconf_save_config(version_string);
2180 list_options = TRUE;
2181 debug_selector |= D_v;
2182 debug_file = stderr;
2186 /* -brt: Test retry configuration lookup */
2188 else if (Ustrcmp(argrest, "rt") == 0)
2191 test_retry_arg = i + 1;
2195 /* -brw: Test rewrite configuration */
2197 else if (Ustrcmp(argrest, "rw") == 0)
2200 test_rewrite_arg = i + 1;
2204 /* -bS: Read SMTP commands on standard input, but produce no replies -
2205 all errors are reported by sending messages. */
2207 else if (Ustrcmp(argrest, "S") == 0)
2208 smtp_input = smtp_batched_input = receiving_message = TRUE;
2210 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2211 on standard output. */
2213 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2215 /* -bt: address testing mode */
2217 else if (Ustrcmp(argrest, "t") == 0)
2218 address_test_mode = checking = log_testing_mode = TRUE;
2220 /* -bv: verify addresses */
2222 else if (Ustrcmp(argrest, "v") == 0)
2223 verify_address_mode = checking = log_testing_mode = TRUE;
2225 /* -bvs: verify sender addresses */
2227 else if (Ustrcmp(argrest, "vs") == 0)
2229 verify_address_mode = checking = log_testing_mode = TRUE;
2230 verify_as_sender = TRUE;
2233 /* -bV: Print version string and support details */
2235 else if (Ustrcmp(argrest, "V") == 0)
2237 printf("Exim version %s #%s built %s\n", version_string,
2238 version_cnumber, version_date);
2239 printf("%s\n", CS version_copyright);
2240 version_printed = TRUE;
2241 show_whats_supported(stdout);
2242 log_testing_mode = TRUE;
2245 /* -bw: inetd wait mode, accept a listening socket as stdin */
2247 else if (*argrest == 'w')
2249 inetd_wait_mode = TRUE;
2250 background_daemon = FALSE;
2251 daemon_listen = TRUE;
2252 if (*(++argrest) != '\0')
2254 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2255 if (inetd_wait_timeout <= 0)
2257 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2267 /* -C: change configuration file list; ignore if it isn't really
2268 a change! Enforce a prefix check if required. */
2273 if(++i < argc) argrest = argv[i]; else
2274 { badarg = TRUE; break; }
2276 if (Ustrcmp(config_main_filelist, argrest) != 0)
2278 #ifdef ALT_CONFIG_PREFIX
2280 int len = Ustrlen(ALT_CONFIG_PREFIX);
2281 uschar *list = argrest;
2283 while((filename = string_nextinlist(&list, &sep, big_buffer,
2284 big_buffer_size)) != NULL)
2286 if ((Ustrlen(filename) < len ||
2287 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2288 Ustrstr(filename, "/../") != NULL) &&
2289 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2291 fprintf(stderr, "-C Permission denied\n");
2296 if (real_uid != root_uid)
2298 #ifdef TRUSTED_CONFIG_LIST
2300 if (real_uid != exim_uid
2301 #ifdef CONFIGURE_OWNER
2302 && real_uid != config_uid
2305 trusted_config = FALSE;
2308 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2311 struct stat statbuf;
2313 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2314 (statbuf.st_uid != root_uid /* owner not root */
2315 #ifdef CONFIGURE_OWNER
2316 && statbuf.st_uid != config_uid /* owner not the special one */
2319 (statbuf.st_gid != root_gid /* group not root */
2320 #ifdef CONFIGURE_GROUP
2321 && statbuf.st_gid != config_gid /* group not the special one */
2323 && (statbuf.st_mode & 020) != 0 /* group writeable */
2325 (statbuf.st_mode & 2) != 0) /* world writeable */
2327 trusted_config = FALSE;
2332 /* Well, the trust list at least is up to scratch... */
2333 void *reset_point = store_get(0);
2334 uschar *trusted_configs[32];
2338 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2340 uschar *start = big_buffer, *nl;
2341 while (*start && isspace(*start))
2345 nl = Ustrchr(start, '\n');
2348 trusted_configs[nr_configs++] = string_copy(start);
2349 if (nr_configs == 32)
2357 const uschar *list = argrest;
2359 while (trusted_config && (filename = string_nextinlist(&list,
2360 &sep, big_buffer, big_buffer_size)) != NULL)
2362 for (i=0; i < nr_configs; i++)
2364 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2367 if (i == nr_configs)
2369 trusted_config = FALSE;
2373 store_reset(reset_point);
2377 /* No valid prefixes found in trust_list file. */
2378 trusted_config = FALSE;
2384 /* Could not open trust_list file. */
2385 trusted_config = FALSE;
2389 /* Not root; don't trust config */
2390 trusted_config = FALSE;
2394 config_main_filelist = argrest;
2395 config_changed = TRUE;
2400 /* -D: set up a macro definition */
2403 #ifdef DISABLE_D_OPTION
2404 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2409 macro_item *mlast = NULL;
2412 uschar *s = argrest;
2414 while (isspace(*s)) s++;
2416 if (*s < 'A' || *s > 'Z')
2418 fprintf(stderr, "exim: macro name set by -D must start with "
2419 "an upper case letter\n");
2423 while (isalnum(*s) || *s == '_')
2425 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2429 if (ptr == 0) { badarg = TRUE; break; }
2430 while (isspace(*s)) s++;
2433 if (*s++ != '=') { badarg = TRUE; break; }
2434 while (isspace(*s)) s++;
2437 for (m = macros; m != NULL; m = m->next)
2439 if (Ustrcmp(m->name, name) == 0)
2441 fprintf(stderr, "exim: duplicated -D in command line\n");
2447 m = store_get(sizeof(macro_item) + Ustrlen(name));
2449 m->command_line = TRUE;
2450 if (mlast == NULL) macros = m; else mlast->next = m;
2451 Ustrcpy(m->name, name);
2452 m->replacement = string_copy(s);
2454 if (clmacro_count >= MAX_CLMACROS)
2456 fprintf(stderr, "exim: too many -D options on command line\n");
2459 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2465 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2466 The latter is now a no-op, retained for compatibility only. If -dd is used,
2467 debugging subprocesses of the daemon is disabled. */
2470 if (Ustrcmp(argrest, "ropcr") == 0)
2472 /* drop_cr = TRUE; */
2475 /* Use an intermediate variable so that we don't set debugging while
2476 decoding the debugging bits. */
2480 unsigned int selector = D_default;
2483 if (*argrest == 'd')
2485 debug_daemon = TRUE;
2489 decode_bits(&selector, 1, debug_notall, argrest,
2490 debug_options, debug_options_count, US"debug", 0);
2491 debug_selector = selector;
2496 /* -E: This is a local error message. This option is not intended for
2497 external use at all, but is not restricted to trusted callers because it
2498 does no harm (just suppresses certain error messages) and if Exim is run
2499 not setuid root it won't always be trusted when it generates error
2500 messages using this option. If there is a message id following -E, point
2501 message_reference at it, for logging. */
2504 local_error_message = TRUE;
2505 if (mac_ismsgid(argrest)) message_reference = argrest;
2509 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2510 option, so it looks as if historically the -oex options are also callable
2511 without the leading -o. So we have to accept them. Before the switch,
2512 anything starting -oe has been converted to -e. Exim does not support all
2513 of the sendmail error options. */
2516 if (Ustrcmp(argrest, "e") == 0)
2518 arg_error_handling = ERRORS_SENDER;
2519 errors_sender_rc = EXIT_SUCCESS;
2521 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2522 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2523 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2524 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2529 /* -F: Set sender's full name, used instead of the gecos entry from
2530 the password file. Since users can usually alter their gecos entries,
2531 there's no security involved in using this instead. The data can follow
2532 the -F or be in the next argument. */
2537 if(++i < argc) argrest = argv[i]; else
2538 { badarg = TRUE; break; }
2540 originator_name = argrest;
2541 sender_name_forced = TRUE;
2545 /* -f: Set sender's address - this value is only actually used if Exim is
2546 run by a trusted user, or if untrusted_set_sender is set and matches the
2547 address, except that the null address can always be set by any user. The
2548 test for this happens later, when the value given here is ignored when not
2549 permitted. For an untrusted user, the actual sender is still put in Sender:
2550 if it doesn't match the From: header (unless no_local_from_check is set).
2551 The data can follow the -f or be in the next argument. The -r switch is an
2552 obsolete form of -f but since there appear to be programs out there that
2553 use anything that sendmail has ever supported, better accept it - the
2554 synonymizing is done before the switch above.
2556 At this stage, we must allow domain literal addresses, because we don't
2557 know what the setting of allow_domain_literals is yet. Ditto for trailing
2558 dots and strip_trailing_dot. */
2562 int dummy_start, dummy_end;
2566 if (i+1 < argc) argrest = argv[++i]; else
2567 { badarg = TRUE; break; }
2570 sender_address = string_sprintf(""); /* Ensure writeable memory */
2573 uschar *temp = argrest + Ustrlen(argrest) - 1;
2574 while (temp >= argrest && isspace(*temp)) temp--;
2575 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2576 allow_domain_literals = TRUE;
2577 strip_trailing_dot = TRUE;
2579 allow_utf8_domains = TRUE;
2581 sender_address = parse_extract_address(argrest, &errmess,
2582 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2584 message_smtputf8 = string_is_utf8(sender_address);
2585 allow_utf8_domains = FALSE;
2587 allow_domain_literals = FALSE;
2588 strip_trailing_dot = FALSE;
2589 if (sender_address == NULL)
2591 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2592 return EXIT_FAILURE;
2595 sender_address_forced = TRUE;
2599 /* -G: sendmail invocation to specify that it's a gateway submission and
2600 sendmail may complain about problems instead of fixing them.
2601 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2602 not at this time complain about problems. */
2608 /* -h: Set the hop count for an incoming message. Exim does not currently
2609 support this; it always computes it by counting the Received: headers.
2610 To put it in will require a change to the spool header file format. */
2615 if(++i < argc) argrest = argv[i]; else
2616 { badarg = TRUE; break; }
2618 if (!isdigit(*argrest)) badarg = TRUE;
2622 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2623 not to be documented for sendmail but mailx (at least) uses it) */
2626 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2630 /* -L: set the identifier used for syslog; equivalent to setting
2631 syslog_processname in the config file, but needs to be an admin option. */
2634 if (*argrest == '\0')
2636 if(++i < argc) argrest = argv[i]; else
2637 { badarg = TRUE; break; }
2639 sz = Ustrlen(argrest);
2642 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2643 return EXIT_FAILURE;
2647 fprintf(stderr, "exim: the -L syslog name is too short\n");
2648 return EXIT_FAILURE;
2650 cmdline_syslog_name = argrest;
2654 receiving_message = FALSE;
2656 /* -MC: continue delivery of another message via an existing open
2657 file descriptor. This option is used for an internal call by the
2658 smtp transport when there is a pending message waiting to go to an
2659 address to which it has got a connection. Five subsequent arguments are
2660 required: transport name, host name, IP address, sequence number, and
2661 message_id. Transports may decline to create new processes if the sequence
2662 number gets too big. The channel is stdin. This (-MC) must be the last
2663 argument. There's a subsequent check that the real-uid is privileged.
2665 If we are running in the test harness. delay for a bit, to let the process
2666 that set this one up complete. This makes for repeatability of the logging,
2669 if (Ustrcmp(argrest, "C") == 0)
2671 union sockaddr_46 interface_sock;
2672 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2676 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2677 return EXIT_FAILURE;
2680 if (msg_action_arg >= 0)
2682 fprintf(stderr, "exim: incompatible arguments\n");
2683 return EXIT_FAILURE;
2686 continue_transport = argv[++i];
2687 continue_hostname = argv[++i];
2688 continue_host_address = argv[++i];
2689 continue_sequence = Uatoi(argv[++i]);
2690 msg_action = MSG_DELIVER;
2691 msg_action_arg = ++i;
2692 forced_delivery = TRUE;
2693 queue_run_pid = passed_qr_pid;
2694 queue_run_pipe = passed_qr_pipe;
2696 if (!mac_ismsgid(argv[i]))
2698 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2700 return EXIT_FAILURE;
2703 /* Set up $sending_ip_address and $sending_port */
2705 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2707 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2711 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2713 return EXIT_FAILURE;
2716 if (running_in_test_harness) millisleep(500);
2720 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2721 precedes -MC (see above). The flag indicates that the host to which
2722 Exim is connected has accepted an AUTH sequence. */
2724 else if (Ustrcmp(argrest, "CA") == 0)
2726 smtp_authenticated = TRUE;
2730 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2731 that exim is connected to supports the esmtp extension DSN */
2733 else if (Ustrcmp(argrest, "CD") == 0)
2735 smtp_use_dsn = TRUE;
2739 /* -MCG: set the queue name, to a non-default value */
2741 else if (Ustrcmp(argrest, "CG") == 0)
2743 if (++i < argc) queue_name = string_copy(argv[i]);
2748 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2749 it preceded -MC (see above) */
2751 else if (Ustrcmp(argrest, "CP") == 0)
2753 smtp_use_pipelining = TRUE;
2757 /* -MCQ: pass on the pid of the queue-running process that started
2758 this chain of deliveries and the fd of its synchronizing pipe; this
2759 is useful only when it precedes -MC (see above) */
2761 else if (Ustrcmp(argrest, "CQ") == 0)
2763 if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2765 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2770 /* -MCS: set the smtp_use_size flag; this is useful only when it
2771 precedes -MC (see above) */
2773 else if (Ustrcmp(argrest, "CS") == 0)
2775 smtp_use_size = TRUE;
2779 /* -MCT: set the tls_offered flag; this is useful only when it
2780 precedes -MC (see above). The flag indicates that the host to which
2781 Exim is connected has offered TLS support. */
2784 else if (Ustrcmp(argrest, "CT") == 0)
2791 /* -M[x]: various operations on the following list of message ids:
2792 -M deliver the messages, ignoring next retry times and thawing
2793 -Mc deliver the messages, checking next retry times, no thawing
2794 -Mf freeze the messages
2795 -Mg give up on the messages
2796 -Mt thaw the messages
2797 -Mrm remove the messages
2798 In the above cases, this must be the last option. There are also the
2799 following options which are followed by a single message id, and which
2800 act on that message. Some of them use the "recipient" addresses as well.
2801 -Mar add recipient(s)
2802 -Mmad mark all recipients delivered
2803 -Mmd mark recipients(s) delivered
2805 -Mset load a message for use with -be
2807 -Mvc show copy (of whole message, in RFC 2822 format)
2812 else if (*argrest == 0)
2814 msg_action = MSG_DELIVER;
2815 forced_delivery = deliver_force_thaw = TRUE;
2817 else if (Ustrcmp(argrest, "ar") == 0)
2819 msg_action = MSG_ADD_RECIPIENT;
2820 one_msg_action = TRUE;
2822 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2823 else if (Ustrcmp(argrest, "es") == 0)
2825 msg_action = MSG_EDIT_SENDER;
2826 one_msg_action = TRUE;
2828 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2829 else if (Ustrcmp(argrest, "g") == 0)
2831 msg_action = MSG_DELIVER;
2832 deliver_give_up = TRUE;
2834 else if (Ustrcmp(argrest, "mad") == 0)
2836 msg_action = MSG_MARK_ALL_DELIVERED;
2838 else if (Ustrcmp(argrest, "md") == 0)
2840 msg_action = MSG_MARK_DELIVERED;
2841 one_msg_action = TRUE;
2843 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2844 else if (Ustrcmp(argrest, "set") == 0)
2846 msg_action = MSG_LOAD;
2847 one_msg_action = TRUE;
2849 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2850 else if (Ustrcmp(argrest, "vb") == 0)
2852 msg_action = MSG_SHOW_BODY;
2853 one_msg_action = TRUE;
2855 else if (Ustrcmp(argrest, "vc") == 0)
2857 msg_action = MSG_SHOW_COPY;
2858 one_msg_action = TRUE;
2860 else if (Ustrcmp(argrest, "vh") == 0)
2862 msg_action = MSG_SHOW_HEADER;
2863 one_msg_action = TRUE;
2865 else if (Ustrcmp(argrest, "vl") == 0)
2867 msg_action = MSG_SHOW_LOG;
2868 one_msg_action = TRUE;
2870 else { badarg = TRUE; break; }
2872 /* All the -Mxx options require at least one message id. */
2874 msg_action_arg = i + 1;
2875 if (msg_action_arg >= argc)
2877 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2878 return EXIT_FAILURE;
2881 /* Some require only message ids to follow */
2883 if (!one_msg_action)
2886 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2888 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2890 return EXIT_FAILURE;
2892 goto END_ARG; /* Remaining args are ids */
2895 /* Others require only one message id, possibly followed by addresses,
2896 which will be handled as normal arguments. */
2900 if (!mac_ismsgid(argv[msg_action_arg]))
2902 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2903 argv[msg_action_arg], arg);
2904 return EXIT_FAILURE;
2911 /* Some programs seem to call the -om option without the leading o;
2912 for sendmail it askes for "me too". Exim always does this. */
2915 if (*argrest != 0) badarg = TRUE;
2919 /* -N: don't do delivery - a debugging option that stops transports doing
2920 their thing. It implies debugging at the D_v level. */
2925 dont_deliver = TRUE;
2926 debug_selector |= D_v;
2927 debug_file = stderr;
2933 /* -n: This means "don't alias" in sendmail, apparently.
2934 For normal invocations, it has no effect.
2935 It may affect some other options. */
2941 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2942 option to the specified value. This form uses long names. We need to handle
2943 -O option=value and -Ooption=value. */
2950 fprintf(stderr, "exim: string expected after -O\n");
2958 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2961 if (*argrest == 'A')
2963 alias_arg = argrest + 1;
2964 if (alias_arg[0] == 0)
2966 if (i+1 < argc) alias_arg = argv[++i]; else
2968 fprintf(stderr, "exim: string expected after -oA\n");
2974 /* -oB: Set a connection message max value for remote deliveries */
2976 else if (*argrest == 'B')
2978 uschar *p = argrest + 1;
2981 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2983 connection_max_messages = 1;
2992 fprintf(stderr, "exim: number expected after -oB\n");
2995 connection_max_messages = Uatoi(p);
2999 /* -odb: background delivery */
3001 else if (Ustrcmp(argrest, "db") == 0)
3003 synchronous_delivery = FALSE;
3004 arg_queue_only = FALSE;
3005 queue_only_set = TRUE;
3008 /* -odf: foreground delivery (smail-compatible option); same effect as
3009 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3012 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3014 synchronous_delivery = TRUE;
3015 arg_queue_only = FALSE;
3016 queue_only_set = TRUE;
3019 /* -odq: queue only */
3021 else if (Ustrcmp(argrest, "dq") == 0)
3023 synchronous_delivery = FALSE;
3024 arg_queue_only = TRUE;
3025 queue_only_set = TRUE;
3028 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3029 but no remote delivery */
3031 else if (Ustrcmp(argrest, "dqs") == 0)
3034 arg_queue_only = FALSE;
3035 queue_only_set = TRUE;
3038 /* -oex: Sendmail error flags. As these are also accepted without the
3039 leading -o prefix, for compatibility with vacation and other callers,
3040 they are handled with -e above. */
3042 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3043 -oitrue: Another sendmail syntax for the same */
3045 else if (Ustrcmp(argrest, "i") == 0 ||
3046 Ustrcmp(argrest, "itrue") == 0)
3049 /* -oM*: Set various characteristics for an incoming message; actually
3050 acted on for trusted callers only. */
3052 else if (*argrest == 'M')
3056 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3060 /* -oMa: Set sender host address */
3062 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3064 /* -oMaa: Set authenticator name */
3066 else if (Ustrcmp(argrest, "Maa") == 0)
3067 sender_host_authenticated = argv[++i];
3069 /* -oMas: setting authenticated sender */
3071 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3073 /* -oMai: setting authenticated id */
3075 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3077 /* -oMi: Set incoming interface address */
3079 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3081 /* -oMm: Message reference */
3083 else if (Ustrcmp(argrest, "Mm") == 0)
3085 if (!mac_ismsgid(argv[i+1]))
3087 fprintf(stderr,"-oMm must be a valid message ID\n");
3090 if (!trusted_config)
3092 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3095 message_reference = argv[++i];
3098 /* -oMr: Received protocol */
3100 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3102 /* -oMs: Set sender host name */
3104 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3106 /* -oMt: Set sender ident */
3108 else if (Ustrcmp(argrest, "Mt") == 0)
3110 sender_ident_set = TRUE;
3111 sender_ident = argv[++i];
3114 /* Else a bad argument */
3123 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3124 seem to call this as -m (undocumented), so that is also accepted (see
3127 else if (Ustrcmp(argrest, "m") == 0) {}
3129 /* -oo: An ancient flag for old-style addresses which still seems to
3130 crop up in some calls (see in SCO). */
3132 else if (Ustrcmp(argrest, "o") == 0) {}
3134 /* -oP <name>: set pid file path for daemon */
3136 else if (Ustrcmp(argrest, "P") == 0)
3137 override_pid_file_path = argv[++i];
3139 /* -or <n>: set timeout for non-SMTP acceptance
3140 -os <n>: set timeout for SMTP acceptance */
3142 else if (*argrest == 'r' || *argrest == 's')
3144 int *tp = (*argrest == 'r')?
3145 &arg_receive_timeout : &arg_smtp_receive_timeout;
3146 if (argrest[1] == 0)
3148 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3150 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3153 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3158 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3160 else if (Ustrcmp(argrest, "X") == 0)
3161 override_local_interfaces = argv[++i];
3163 /* Unknown -o argument */
3169 /* -ps: force Perl startup; -pd force delayed Perl startup */
3173 if (*argrest == 's' && argrest[1] == 0)
3175 perl_start_option = 1;
3178 if (*argrest == 'd' && argrest[1] == 0)
3180 perl_start_option = -1;
3185 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3186 which sets the host protocol and host name */
3190 if (i+1 < argc) argrest = argv[++i]; else
3191 { badarg = TRUE; break; }
3196 uschar *hn = Ustrchr(argrest, ':');
3199 received_protocol = argrest;
3203 received_protocol = string_copyn(argrest, hn - argrest);
3204 sender_host_name = hn + 1;
3211 receiving_message = FALSE;
3212 if (queue_interval >= 0)
3214 fprintf(stderr, "exim: -q specified more than once\n");
3218 /* -qq...: Do queue runs in a 2-stage manner */
3220 if (*argrest == 'q')
3222 queue_2stage = TRUE;
3226 /* -qi...: Do only first (initial) deliveries */
3228 if (*argrest == 'i')
3230 queue_run_first_delivery = TRUE;
3234 /* -qf...: Run the queue, forcing deliveries
3235 -qff..: Ditto, forcing thawing as well */
3237 if (*argrest == 'f')
3239 queue_run_force = TRUE;
3240 if (*++argrest == 'f')
3242 deliver_force_thaw = TRUE;
3247 /* -q[f][f]l...: Run the queue only on local deliveries */
3249 if (*argrest == 'l')
3251 queue_run_local = TRUE;
3255 /* -q[f][f][l][G<name>]... Work on the named queue */
3257 if (*argrest == 'G')
3260 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3261 queue_name = string_copyn(argrest, i);
3263 if (*argrest == '/') argrest++;
3266 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3267 only, optionally named, optionally starting from a given message id. */
3269 if (*argrest == 0 &&
3270 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3273 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3274 start_queue_run_id = argv[++i];
3275 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3276 stop_queue_run_id = argv[++i];
3279 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3280 forced, optionally local only, optionally named. */
3282 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3285 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3291 case 'R': /* Synonymous with -qR... */
3292 receiving_message = FALSE;
3294 /* -Rf: As -R (below) but force all deliveries,
3295 -Rff: Ditto, but also thaw all frozen messages,
3296 -Rr: String is regex
3297 -Rrf: Regex and force
3298 -Rrff: Regex and force and thaw
3300 in all cases provided there are no further characters in this
3306 for (i = 0; i < nelem(rsopts); i++)
3307 if (Ustrcmp(argrest, rsopts[i]) == 0)
3309 if (i != 2) queue_run_force = TRUE;
3310 if (i >= 2) deliver_selectstring_regex = TRUE;
3311 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3312 argrest += Ustrlen(rsopts[i]);
3316 /* -R: Set string to match in addresses for forced queue run to
3317 pick out particular messages. */
3320 deliver_selectstring = argrest;
3321 else if (i+1 < argc)
3322 deliver_selectstring = argv[++i];
3325 fprintf(stderr, "exim: string expected after -R\n");
3331 /* -r: an obsolete synonym for -f (see above) */
3334 /* -S: Like -R but works on sender. */
3336 case 'S': /* Synonymous with -qS... */
3337 receiving_message = FALSE;
3339 /* -Sf: As -S (below) but force all deliveries,
3340 -Sff: Ditto, but also thaw all frozen messages,
3341 -Sr: String is regex
3342 -Srf: Regex and force
3343 -Srff: Regex and force and thaw
3345 in all cases provided there are no further characters in this
3351 for (i = 0; i < nelem(rsopts); i++)
3352 if (Ustrcmp(argrest, rsopts[i]) == 0)
3354 if (i != 2) queue_run_force = TRUE;
3355 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3356 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3357 argrest += Ustrlen(rsopts[i]);
3361 /* -S: Set string to match in addresses for forced queue run to
3362 pick out particular messages. */
3365 deliver_selectstring_sender = argrest;
3366 else if (i+1 < argc)
3367 deliver_selectstring_sender = argv[++i];
3370 fprintf(stderr, "exim: string expected after -S\n");
3375 /* -Tqt is an option that is exclusively for use by the testing suite.
3376 It is not recognized in other circumstances. It allows for the setting up
3377 of explicit "queue times" so that various warning/retry things can be
3378 tested. Otherwise variability of clock ticks etc. cause problems. */
3381 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3382 fudged_queue_times = argv[++i];
3387 /* -t: Set flag to extract recipients from body of message. */
3390 if (*argrest == 0) extract_recipients = TRUE;
3392 /* -ti: Set flag to extract recipients from body of message, and also
3393 specify that dot does not end the message. */
3395 else if (Ustrcmp(argrest, "i") == 0)
3397 extract_recipients = TRUE;
3401 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3404 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3411 /* -U: This means "initial user submission" in sendmail, apparently. The
3412 doc claims that in future sendmail may refuse syntactically invalid
3413 messages instead of fixing them. For the moment, we just ignore it. */
3419 /* -v: verify things - this is a very low-level debugging */
3424 debug_selector |= D_v;
3425 debug_file = stderr;
3431 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3433 The -x flag tells the sendmail command that mail from a local
3434 mail program has National Language Support (NLS) extended characters
3435 in the body of the mail item. The sendmail command can send mail with
3436 extended NLS characters across networks that normally corrupts these
3439 As Exim is 8-bit clean, it just ignores this flag. */
3442 if (*argrest != 0) badarg = TRUE;
3445 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3446 logs to that file. We swallow the parameter and otherwise ignore it. */
3449 if (*argrest == '\0')
3452 fprintf(stderr, "exim: string expected after -X\n");
3458 if (*argrest == '\0')
3459 if (++i < argc) log_oneline = argv[i]; else
3461 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3466 /* All other initial characters are errors */
3471 } /* End of high-level switch statement */
3473 /* Failed to recognize the option, or syntax error */
3477 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3478 "option %s\n", arg);
3484 /* If -R or -S have been specified without -q, assume a single queue run. */
3486 if ( (deliver_selectstring || deliver_selectstring_sender)
3487 && queue_interval < 0)
3492 /* If usage_wanted is set we call the usage function - which never returns */
3493 if (usage_wanted) exim_usage(called_as);
3495 /* Arguments have been processed. Check for incompatibilities. */
3497 (smtp_input || extract_recipients || recipients_arg < argc) &&
3498 (daemon_listen || queue_interval >= 0 || bi_option ||
3499 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3500 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3503 msg_action_arg > 0 &&
3504 (daemon_listen || queue_interval > 0 || list_options ||
3505 (checking && msg_action != MSG_LOAD) ||
3506 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3509 (daemon_listen || queue_interval > 0) &&
3510 (sender_address != NULL || list_options || list_queue || checking ||
3514 daemon_listen && queue_interval == 0
3517 inetd_wait_mode && queue_interval >= 0
3521 (checking || smtp_input || extract_recipients ||
3522 filter_test != FTEST_NONE || bi_option)
3525 verify_address_mode &&
3526 (address_test_mode || smtp_input || extract_recipients ||
3527 filter_test != FTEST_NONE || bi_option)
3530 address_test_mode && (smtp_input || extract_recipients ||
3531 filter_test != FTEST_NONE || bi_option)
3534 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3538 deliver_selectstring != NULL && queue_interval < 0
3541 msg_action == MSG_LOAD &&
3542 (!expansion_test || expansion_test_message != NULL)
3546 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3550 /* If debugging is set up, set the file and the file descriptor to pass on to
3551 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3552 to run in the foreground. */
3554 if (debug_selector != 0)
3556 debug_file = stderr;
3557 debug_fd = fileno(debug_file);
3558 background_daemon = FALSE;
3559 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3560 if (debug_selector != D_v) /* -v only doesn't show this */
3562 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3563 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3565 if (!version_printed)
3566 show_whats_supported(stderr);
3570 /* When started with root privilege, ensure that the limits on the number of
3571 open files and the number of processes (where that is accessible) are
3572 sufficiently large, or are unset, in case Exim has been called from an
3573 environment where the limits are screwed down. Not all OS have the ability to
3574 change some of these limits. */
3578 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3584 #ifdef RLIMIT_NOFILE
3585 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3587 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3589 rlp.rlim_cur = rlp.rlim_max = 0;
3592 /* I originally chose 1000 as a nice big number that was unlikely to
3593 be exceeded. It turns out that some older OS have a fixed upper limit of
3596 if (rlp.rlim_cur < 1000)
3598 rlp.rlim_cur = rlp.rlim_max = 1000;
3599 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3601 rlp.rlim_cur = rlp.rlim_max = 256;
3602 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3603 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3610 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3612 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3614 rlp.rlim_cur = rlp.rlim_max = 0;
3617 #ifdef RLIM_INFINITY
3618 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3620 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3622 if (rlp.rlim_cur < 1000)
3624 rlp.rlim_cur = rlp.rlim_max = 1000;
3626 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3627 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3633 /* Exim is normally entered as root (but some special configurations are
3634 possible that don't do this). However, it always spins off sub-processes that
3635 set their uid and gid as required for local delivery. We don't want to pass on
3636 any extra groups that root may belong to, so we want to get rid of them all at
3639 We need to obey setgroups() at this stage, before possibly giving up root
3640 privilege for a changed configuration file, but later on we might need to
3641 check on the additional groups for the admin user privilege - can't do that
3642 till after reading the config, which might specify the exim gid. Therefore,
3643 save the group list here first. */
3645 group_count = getgroups(NGROUPS_MAX, group_list);
3646 if (group_count < 0)
3648 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3652 /* There is a fundamental difference in some BSD systems in the matter of
3653 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3654 known not to be different. On the "different" systems there is a single group
3655 list, and the first entry in it is the current group. On all other versions of
3656 Unix there is a supplementary group list, which is in *addition* to the current
3657 group. Consequently, to get rid of all extraneous groups on a "standard" system
3658 you pass over 0 groups to setgroups(), while on a "different" system you pass
3659 over a single group - the current group, which is always the first group in the
3660 list. Calling setgroups() with zero groups on a "different" system results in
3661 an error return. The following code should cope with both types of system.
3663 However, if this process isn't running as root, setgroups() can't be used
3664 since you have to be root to run it, even if throwing away groups. Not being
3665 root here happens only in some unusual configurations. We just ignore the
3668 if (setgroups(0, NULL) != 0)
3670 if (setgroups(1, group_list) != 0 && !unprivileged)
3672 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3677 /* If the configuration file name has been altered by an argument on the
3678 command line (either a new file name or a macro definition) and the caller is
3679 not root, or if this is a filter testing run, remove any setuid privilege the
3680 program has and run as the underlying user.
3682 The exim user is locked out of this, which severely restricts the use of -C
3685 Otherwise, set the real ids to the effective values (should be root unless run
3686 from inetd, which it can either be root or the exim uid, if one is configured).
3688 There is a private mechanism for bypassing some of this, in order to make it
3689 possible to test lots of configurations automatically, without having either to
3690 recompile each time, or to patch in an actual configuration file name and other
3691 values (such as the path name). If running in the test harness, pretend that
3692 configuration file changes and macro definitions haven't happened. */
3695 (!trusted_config || /* Config changed, or */
3696 !macros_trusted()) && /* impermissible macros and */
3697 real_uid != root_uid && /* Not root, and */
3698 !running_in_test_harness /* Not fudged */
3700 expansion_test /* expansion testing */
3702 filter_test != FTEST_NONE) /* Filter testing */
3704 setgroups(group_count, group_list);
3705 exim_setugid(real_uid, real_gid, FALSE,
3706 US"-C, -D, -be or -bf forces real uid");
3707 removed_privilege = TRUE;
3709 /* In the normal case when Exim is called like this, stderr is available
3710 and should be used for any logging information because attempts to write
3711 to the log will usually fail. To arrange this, we unset really_exim. However,
3712 if no stderr is available there is no point - we might as well have a go
3713 at the log (if it fails, syslog will be written).
3715 Note that if the invoker is Exim, the logs remain available. Messing with
3716 this causes unlogged successful deliveries. */
3718 if ((log_stderr != NULL) && (real_uid != exim_uid))
3719 really_exim = FALSE;
3722 /* Privilege is to be retained for the moment. It may be dropped later,
3723 depending on the job that this Exim process has been asked to do. For now, set
3724 the real uid to the effective so that subsequent re-execs of Exim are done by a
3727 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3729 /* If testing a filter, open the file(s) now, before wasting time doing other
3730 setups and reading the message. */
3732 if ((filter_test & FTEST_SYSTEM) != 0)
3734 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3737 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3739 return EXIT_FAILURE;
3743 if ((filter_test & FTEST_USER) != 0)
3745 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3748 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3750 return EXIT_FAILURE;
3754 /* Initialise lookup_list
3755 If debugging, already called above via version reporting.
3756 In either case, we initialise the list of available lookups while running
3757 as root. All dynamically modules are loaded from a directory which is
3758 hard-coded into the binary and is code which, if not a module, would be
3759 part of Exim already. Ability to modify the content of the directory
3760 is equivalent to the ability to modify a setuid binary!
3762 This needs to happen before we read the main configuration. */
3766 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3769 /* Read the main runtime configuration data; this gives up if there
3770 is a failure. It leaves the configuration file open so that the subsequent
3771 configuration data for delivery can be read if needed.
3773 NOTE: immediatly after opening the configuration file we change the working
3774 directory to "/"! Later we change to $spool_directory. We do it there, because
3775 during readconf_main() some expansion takes place already. */
3777 /* Store the initial cwd before we change directories */
3778 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3780 perror("exim: can't get the current working directory");
3785 -be[m] expansion test -
3786 -b[fF] filter test new
3788 -bmalware malware_test_file new
3790 -brw rewrite test new
3792 -bv[s] address verify -
3794 -bP <option> (except -bP config, which sets list_config)
3796 If any of these options is set, we suppress warnings about configuration
3797 issues (currently about tls_advertise_hosts and keep_environment not being
3800 readconf_main(checking || list_options);
3802 /* Now in directory "/" */
3804 if (cleanup_environment() == FALSE)
3805 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3808 /* If an action on specific messages is requested, or if a daemon or queue
3809 runner is being started, we need to know if Exim was called by an admin user.
3810 This is the case if the real user is root or exim, or if the real group is
3811 exim, or if one of the supplementary groups is exim or a group listed in
3812 admin_groups. We don't fail all message actions immediately if not admin_user,
3813 since some actions can be performed by non-admin users. Instead, set admin_user
3814 for later interrogation. */
3816 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3821 for (i = 0; i < group_count; i++)
3823 if (group_list[i] == exim_gid) admin_user = TRUE;
3824 else if (admin_groups != NULL)
3826 for (j = 1; j <= (int)(admin_groups[0]); j++)
3827 if (admin_groups[j] == group_list[i])
3828 { admin_user = TRUE; break; }
3830 if (admin_user) break;
3834 /* Another group of privileged users are the trusted users. These are root,
3835 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3836 are permitted to specify sender_addresses with -f on the command line, and
3837 other message parameters as well. */
3839 if (real_uid == root_uid || real_uid == exim_uid)
3840 trusted_caller = TRUE;
3845 if (trusted_users != NULL)
3847 for (i = 1; i <= (int)(trusted_users[0]); i++)
3848 if (trusted_users[i] == real_uid)
3849 { trusted_caller = TRUE; break; }
3852 if (!trusted_caller && trusted_groups != NULL)
3854 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3856 if (trusted_groups[i] == real_gid)
3857 trusted_caller = TRUE;
3858 else for (j = 0; j < group_count; j++)
3860 if (trusted_groups[i] == group_list[j])
3861 { trusted_caller = TRUE; break; }
3863 if (trusted_caller) break;
3868 /* Handle the decoding of logging options. */
3870 decode_bits(log_selector, log_selector_size, log_notall,
3871 log_selector_string, log_options, log_options_count, US"log", 0);
3876 debug_printf("configuration file is %s\n", config_main_filename);
3877 debug_printf("log selectors =");
3878 for (i = 0; i < log_selector_size; i++)
3879 debug_printf(" %08x", log_selector[i]);
3883 /* If domain literals are not allowed, check the sender address that was
3884 supplied with -f. Ditto for a stripped trailing dot. */
3886 if (sender_address != NULL)
3888 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3890 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3891 "allowed\n", sender_address);
3892 return EXIT_FAILURE;
3894 if (f_end_dot && !strip_trailing_dot)
3896 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3897 "(trailing dot not allowed)\n", sender_address);
3898 return EXIT_FAILURE;
3902 /* See if an admin user overrode our logging. */
3904 if (cmdline_syslog_name != NULL)
3908 syslog_processname = cmdline_syslog_name;
3909 log_file_path = string_copy(CUS"syslog");
3913 /* not a panic, non-privileged users should not be able to spam paniclog */
3915 "exim: you lack sufficient privilege to specify syslog process name\n");
3916 return EXIT_FAILURE;
3920 /* Paranoia check of maximum lengths of certain strings. There is a check
3921 on the length of the log file path in log.c, which will come into effect
3922 if there are any calls to write the log earlier than this. However, if we
3923 get this far but the string is very long, it is better to stop now than to
3924 carry on and (e.g.) receive a message and then have to collapse. The call to
3925 log_write() from here will cause the ultimate panic collapse if the complete
3926 file name exceeds the buffer length. */
3928 if (Ustrlen(log_file_path) > 200)
3929 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3930 "log_file_path is longer than 200 chars: aborting");
3932 if (Ustrlen(pid_file_path) > 200)
3933 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3934 "pid_file_path is longer than 200 chars: aborting");
3936 if (Ustrlen(spool_directory) > 200)
3937 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3938 "spool_directory is longer than 200 chars: aborting");
3940 /* Length check on the process name given to syslog for its TAG field,
3941 which is only permitted to be 32 characters or less. See RFC 3164. */
3943 if (Ustrlen(syslog_processname) > 32)
3944 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3945 "syslog_processname is longer than 32 chars: aborting");
3951 log_write(0, LOG_MAIN, "%s", log_oneline);
3952 return EXIT_SUCCESS;
3955 return EXIT_FAILURE;
3958 /* In some operating systems, the environment variable TMPDIR controls where
3959 temporary files are created; Exim doesn't use these (apart from when delivering
3960 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3961 If TMPDIR is found in the environment, reset it to the value defined in the
3962 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3963 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3964 EXIM_TMPDIR by the build scripts.
3970 if (environ) for (p = USS environ; *p != NULL; p++)
3972 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3973 Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3975 uschar *newp = malloc(Ustrlen(EXIM_TMPDIR) + 8);
3976 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3978 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3984 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3985 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3986 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3987 called by a user who has set the TZ variable. This then affects the timestamps
3988 in log files and in Received: headers, and any created Date: header lines. The
3989 required timezone is settable in the configuration file, so nothing can be done
3990 about this earlier - but hopefully nothing will normally be logged earlier than
3991 this. We have to make a new environment if TZ is wrong, but don't bother if
3992 timestamps_utc is set, because then all times are in UTC anyway. */
3994 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3996 timestamps_utc = TRUE;
4000 uschar *envtz = US getenv("TZ");
4001 if ((envtz == NULL && timezone_string != NULL) ||
4003 (timezone_string == NULL ||
4004 Ustrcmp(timezone_string, envtz) != 0)))
4006 uschar **p = USS environ;
4010 if (environ) while (*p++ != NULL) count++;
4011 if (envtz == NULL) count++;
4012 newp = new = malloc(sizeof(uschar *) * (count + 1));
4013 if (environ) for (p = USS environ; *p != NULL; p++)
4015 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
4018 if (timezone_string != NULL)
4020 *newp = malloc(Ustrlen(timezone_string) + 4);
4021 sprintf(CS *newp++, "TZ=%s", timezone_string);
4026 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4027 tod_stamp(tod_log));
4031 /* Handle the case when we have removed the setuid privilege because of -C or
4032 -D. This means that the caller of Exim was not root.
4034 There is a problem if we were running as the Exim user. The sysadmin may
4035 expect this case to retain privilege because "the binary was called by the
4036 Exim user", but it hasn't, because either the -D option set macros, or the
4037 -C option set a non-trusted configuration file. There are two possibilities:
4039 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4040 to do message deliveries. Thus, the fact that it is running as a
4041 non-privileged user is plausible, and might be wanted in some special
4042 configurations. However, really_exim will have been set false when
4043 privilege was dropped, to stop Exim trying to write to its normal log
4044 files. Therefore, re-enable normal log processing, assuming the sysadmin
4045 has set up the log directory correctly.
4047 (2) If deliver_drop_privilege is not set, the configuration won't work as
4048 apparently intended, and so we log a panic message. In order to retain
4049 root for -C or -D, the caller must either be root or be invoking a
4050 trusted configuration file (when deliver_drop_privilege is false). */
4052 if (removed_privilege && (!trusted_config || macros != NULL) &&
4053 real_uid == exim_uid)
4055 if (deliver_drop_privilege)
4056 really_exim = TRUE; /* let logging work normally */
4058 log_write(0, LOG_MAIN|LOG_PANIC,
4059 "exim user lost privilege for using %s option",
4060 trusted_config? "-D" : "-C");
4063 /* Start up Perl interpreter if Perl support is configured and there is a
4064 perl_startup option, and the configuration or the command line specifies
4065 initializing starting. Note that the global variables are actually called
4066 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4069 if (perl_start_option != 0)
4070 opt_perl_at_start = (perl_start_option > 0);
4071 if (opt_perl_at_start && opt_perl_startup != NULL)
4074 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4075 errstr = init_perl(opt_perl_startup);
4078 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4079 return EXIT_FAILURE;
4081 opt_perl_started = TRUE;
4083 #endif /* EXIM_PERL */
4085 /* Log the arguments of the call if the configuration file said so. This is
4086 a debugging feature for finding out what arguments certain MUAs actually use.
4087 Don't attempt it if logging is disabled, or if listing variables or if
4088 verifying/testing addresses or expansions. */
4090 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4091 && really_exim && !list_options && !checking)
4094 uschar *p = big_buffer;
4095 Ustrcpy(p, "cwd= (failed)");
4097 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4100 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4102 for (i = 0; i < argc; i++)
4104 int len = Ustrlen(argv[i]);
4105 const uschar *printing;
4107 if (p + len + 8 >= big_buffer + big_buffer_size)
4110 log_write(0, LOG_MAIN, "%s", big_buffer);
4111 Ustrcpy(big_buffer, "...");
4114 printing = string_printing(argv[i]);
4115 if (printing[0] == 0) quote = US"\""; else
4117 const uschar *pp = printing;
4119 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4121 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4122 (p - big_buffer) - 4), printing, quote);
4126 if (LOGGING(arguments))
4127 log_write(0, LOG_MAIN, "%s", big_buffer);
4129 debug_printf("%s\n", big_buffer);
4132 /* Set the working directory to be the top-level spool directory. We don't rely
4133 on this in the code, which always uses fully qualified names, but it's useful
4134 for core dumps etc. Don't complain if it fails - the spool directory might not
4135 be generally accessible and calls with the -C option (and others) have lost
4136 privilege by now. Before the chdir, we try to ensure that the directory exists.
4139 if (Uchdir(spool_directory) != 0)
4142 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4143 dummy = /* quieten compiler */ Uchdir(spool_directory);
4146 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4147 alias file. Exim doesn't have such a concept, but this call is screwed into
4148 Sun's YP makefiles. Handle this by calling a configured script, as the real
4149 user who called Exim. The -oA option can be used to pass an argument to the
4154 (void)fclose(config_file);
4155 if (bi_command != NULL)
4159 argv[i++] = bi_command;
4160 if (alias_arg != NULL) argv[i++] = alias_arg;
4163 setgroups(group_count, group_list);
4164 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4166 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4167 (argv[1] == NULL)? US"" : argv[1]);
4169 execv(CS argv[0], (char *const *)argv);
4170 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4175 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4180 /* We moved the admin/trusted check to be immediately after reading the
4181 configuration file. We leave these prints here to ensure that syslog setup,
4182 logfile setup, and so on has already happened. */
4184 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4185 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4187 /* Only an admin user may start the daemon or force a queue run in the default
4188 configuration, but the queue run restriction can be relaxed. Only an admin
4189 user may request that a message be returned to its sender forthwith. Only an
4190 admin user may specify a debug level greater than D_v (because it might show
4191 passwords, etc. in lookup queries). Only an admin user may request a queue
4192 count. Only an admin user can use the test interface to scan for email
4193 (because Exim will be in the spool dir and able to look at mails). */
4197 BOOL debugset = (debug_selector & ~D_v) != 0;
4198 if (deliver_give_up || daemon_listen || malware_test_file ||
4199 (count_queue && queue_list_requires_admin) ||
4200 (list_queue && queue_list_requires_admin) ||
4201 (queue_interval >= 0 && prod_requires_admin) ||
4202 (debugset && !running_in_test_harness))
4204 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4209 /* If the real user is not root or the exim uid, the argument for passing
4210 in an open TCP/IP connection for another message is not permitted, nor is
4211 running with the -N option for any delivery action, unless this call to exim is
4212 one that supplied an input message, or we are using a patched exim for
4213 regression testing. */
4215 if (real_uid != root_uid && real_uid != exim_uid &&
4216 (continue_hostname != NULL ||
4218 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4219 )) && !running_in_test_harness)
4221 fprintf(stderr, "exim: Permission denied\n");
4222 return EXIT_FAILURE;
4225 /* If the caller is not trusted, certain arguments are ignored when running for
4226 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4227 Note that authority for performing certain actions on messages is tested in the
4228 queue_action() function. */
4230 if (!trusted_caller && !checking)
4232 sender_host_name = sender_host_address = interface_address =
4233 sender_ident = received_protocol = NULL;
4234 sender_host_port = interface_port = 0;
4235 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4238 /* If a sender host address is set, extract the optional port number off the
4239 end of it and check its syntax. Do the same thing for the interface address.
4240 Exim exits if the syntax is bad. */
4244 if (sender_host_address != NULL)
4245 sender_host_port = check_port(sender_host_address);
4246 if (interface_address != NULL)
4247 interface_port = check_port(interface_address);
4250 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4255 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4256 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4260 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4261 return EXIT_FAILURE;
4265 /* If an SMTP message is being received check to see if the standard input is a
4266 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4267 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4272 union sockaddr_46 inetd_sock;
4273 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4274 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4276 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4277 if (family == AF_INET || family == AF_INET6)
4279 union sockaddr_46 interface_sock;
4280 size = sizeof(interface_sock);
4282 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4283 interface_address = host_ntoa(-1, &interface_sock, NULL,
4286 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4288 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4291 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4292 NULL, &sender_host_port);
4293 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4294 "inetd is not supported when mua_wrapper is set");
4299 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4300 return EXIT_FAILURE;
4306 /* If the load average is going to be needed while receiving a message, get it
4307 now for those OS that require the first call to os_getloadavg() to be done as
4308 root. There will be further calls later for each message received. */
4310 #ifdef LOAD_AVG_NEEDS_ROOT
4311 if (receiving_message &&
4312 (queue_only_load >= 0 ||
4313 (is_inetd && smtp_load_reserve >= 0)
4316 load_average = OS_GETLOADAVG();
4320 /* The queue_only configuration option can be overridden by -odx on the command
4321 line, except that if queue_only_override is false, queue_only cannot be unset
4322 from the command line. */
4324 if (queue_only_set && (queue_only_override || arg_queue_only))
4325 queue_only = arg_queue_only;
4327 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4330 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4331 if (arg_smtp_receive_timeout >= 0)
4332 smtp_receive_timeout = arg_smtp_receive_timeout;
4334 /* If Exim was started with root privilege, unless we have already removed the
4335 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4336 except when starting the daemon or doing some kind of delivery or address
4337 testing (-bt). These are the only cases when root need to be retained. We run
4338 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4339 retained only for starting the daemon. We always do the initgroups() in this
4340 situation (controlled by the TRUE below), in order to be as close as possible
4341 to the state Exim usually runs in. */
4343 if (!unprivileged && /* originally had root AND */
4344 !removed_privilege && /* still got root AND */
4345 !daemon_listen && /* not starting the daemon */
4346 queue_interval <= 0 && /* (either kind of daemon) */
4348 deliver_drop_privilege || /* requested unprivileged */
4350 queue_interval < 0 && /* not running the queue */
4351 (msg_action_arg < 0 || /* and */
4352 msg_action != MSG_DELIVER) && /* not delivering and */
4353 (!checking || !address_test_mode) /* not address checking */
4357 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4360 /* When we are retaining a privileged uid, we still change to the exim gid. */
4365 rv = setgid(exim_gid);
4366 /* Impact of failure is that some stuff might end up with an incorrect group.
4367 We track this for failures from root, since any attempt to change privilege
4368 by root should succeed and failures should be examined. For non-root,
4369 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4370 no need to complain then. */
4373 if (!(unprivileged || removed_privilege))
4376 "exim: changing group failed: %s\n", strerror(errno));
4380 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4381 (long int)exim_gid, strerror(errno));
4385 /* Handle a request to scan a file for malware */
4386 if (malware_test_file)
4388 #ifdef WITH_CONTENT_SCAN
4390 set_process_info("scanning file for malware");
4391 result = malware_in_file(malware_test_file);
4394 printf("No malware found.\n");
4399 printf("Malware lookup returned non-okay/fail: %d\n", result);
4403 printf("Malware found: %s\n", malware_name);
4405 printf("Malware scan detected malware of unknown name.\n");
4407 printf("Malware scanning not enabled at compile time.\n");
4412 /* Handle a request to list the delivery queue */
4416 set_process_info("listing the queue");
4417 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4421 /* Handle a request to count the delivery queue */
4425 set_process_info("counting the queue");
4430 /* Handle actions on specific messages, except for the force delivery and
4431 message load actions, which are done below. Some actions take a whole list of
4432 message ids, which are known to continue up to the end of the arguments. Others
4433 take a single message id and then operate on the recipients list. */
4435 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4437 int yield = EXIT_SUCCESS;
4438 set_process_info("acting on specified messages");
4440 if (!one_msg_action)
4442 for (i = msg_action_arg; i < argc; i++)
4443 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4444 yield = EXIT_FAILURE;
4447 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4448 recipients_arg)) yield = EXIT_FAILURE;
4452 /* We used to set up here to skip reading the ACL section, on
4453 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4454 Now, since the intro of the ${acl } expansion, ACL definitions may be
4455 needed in transports so we lost the optimisation. */
4459 /* The configuration data will have been read into POOL_PERM because we won't
4460 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4461 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4462 configuration were read into POOL_MAIN, because we don't do any resets till
4463 later on. However, it seems right, and it does ensure that both pools get used.
4466 store_pool = POOL_MAIN;
4468 /* Handle the -brt option. This is for checking out retry configurations.
4469 The next three arguments are a domain name or a complete address, and
4470 optionally two error numbers. All it does is to call the function that
4471 scans the retry configuration data. */
4473 if (test_retry_arg >= 0)
4475 retry_config *yield;
4476 int basic_errno = 0;
4480 if (test_retry_arg >= argc)
4482 printf("-brt needs a domain or address argument\n");
4483 exim_exit(EXIT_FAILURE);
4485 s1 = argv[test_retry_arg++];
4488 /* If the first argument contains no @ and no . it might be a local user
4489 or it might be a single-component name. Treat as a domain. */
4491 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4493 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4494 "being \ntreated as a one-component domain, not as a local part.\n\n",
4498 /* There may be an optional second domain arg. */
4500 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4501 s2 = argv[test_retry_arg++];
4503 /* The final arg is an error name */
4505 if (test_retry_arg < argc)
4507 uschar *ss = argv[test_retry_arg];
4509 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4512 printf("%s\n", CS error);
4513 return EXIT_FAILURE;
4516 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4517 code > 100 as an error is for matching codes to the decade. Turn them into
4518 a real error code, off the decade. */
4520 if (basic_errno == ERRNO_MAIL4XX ||
4521 basic_errno == ERRNO_RCPT4XX ||
4522 basic_errno == ERRNO_DATA4XX)
4524 int code = (more_errno >> 8) & 255;
4526 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4527 else if (code > 100)
4528 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4532 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4533 if (yield == NULL) printf("No retry information found\n"); else
4536 more_errno = yield->more_errno;
4537 printf("Retry rule: %s ", yield->pattern);
4539 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4541 printf("quota%s%s ",
4542 (more_errno > 0)? "_" : "",
4543 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4545 else if (yield->basic_errno == ECONNREFUSED)
4547 printf("refused%s%s ",
4548 (more_errno > 0)? "_" : "",
4549 (more_errno == 'M')? "MX" :
4550 (more_errno == 'A')? "A" : "");
4552 else if (yield->basic_errno == ETIMEDOUT)
4555 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4557 if (more_errno != 0) printf("_%s",
4558 (more_errno == 'M')? "MX" : "A");
4561 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4562 printf("auth_failed ");
4565 for (r = yield->rules; r != NULL; r = r->next)
4567 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4568 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4574 printf(",%d.", x/1000);
4588 exim_exit(EXIT_SUCCESS);
4591 /* Handle a request to list one or more configuration options */
4592 /* If -n was set, we suppress some information */
4596 set_process_info("listing variables");
4597 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4598 else for (i = recipients_arg; i < argc; i++)
4601 (Ustrcmp(argv[i], "router") == 0 ||
4602 Ustrcmp(argv[i], "transport") == 0 ||
4603 Ustrcmp(argv[i], "authenticator") == 0 ||
4604 Ustrcmp(argv[i], "macro") == 0 ||
4605 Ustrcmp(argv[i], "environment") == 0))
4607 readconf_print(argv[i+1], argv[i], flag_n);
4610 else readconf_print(argv[i], NULL, flag_n);
4612 exim_exit(EXIT_SUCCESS);
4617 set_process_info("listing config");
4618 readconf_print(US"config", NULL, flag_n);
4619 exim_exit(EXIT_SUCCESS);
4623 /* Initialise subsystems as required */
4624 #ifndef DISABLE_DKIM
4630 /* Handle a request to deliver one or more messages that are already on the
4631 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4632 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4634 Delivery of specific messages is typically used for a small number when
4635 prodding by hand (when the option forced_delivery will be set) or when
4636 re-execing to regain root privilege. Each message delivery must happen in a
4637 separate process, so we fork a process for each one, and run them sequentially
4638 so that debugging output doesn't get intertwined, and to avoid spawning too
4639 many processes if a long list is given. However, don't fork for the last one;
4640 this saves a process in the common case when Exim is called to deliver just one
4643 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4645 if (prod_requires_admin && !admin_user)
4647 fprintf(stderr, "exim: Permission denied\n");
4648 exim_exit(EXIT_FAILURE);
4650 set_process_info("delivering specified messages");
4651 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4652 for (i = msg_action_arg; i < argc; i++)
4657 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4658 else if ((pid = fork()) == 0)
4660 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4661 _exit(EXIT_SUCCESS);
4665 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4667 exim_exit(EXIT_FAILURE);
4671 exim_exit(EXIT_SUCCESS);
4675 /* If only a single queue run is requested, without SMTP listening, we can just
4676 turn into a queue runner, with an optional starting message id. */
4678 if (queue_interval == 0 && !daemon_listen)
4680 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4681 (start_queue_run_id == NULL)? US"" : US" starting at ",
4682 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4683 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4684 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4686 set_process_info("running the '%s' queue (single queue run)", queue_name);
4688 set_process_info("running the queue (single queue run)");
4689 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4690 exim_exit(EXIT_SUCCESS);
4694 /* Find the login name of the real user running this process. This is always
4695 needed when receiving a message, because it is written into the spool file. It
4696 may also be used to construct a from: or a sender: header, and in this case we
4697 need the user's full name as well, so save a copy of it, checked for RFC822
4698 syntax and munged if necessary, if it hasn't previously been set by the -F
4699 argument. We may try to get the passwd entry more than once, in case NIS or
4700 other delays are in evidence. Save the home directory for use in filter testing
4705 if ((pw = getpwuid(real_uid)) != NULL)
4707 originator_login = string_copy(US pw->pw_name);
4708 originator_home = string_copy(US pw->pw_dir);
4710 /* If user name has not been set by -F, set it from the passwd entry
4711 unless -f has been used to set the sender address by a trusted user. */
4713 if (originator_name == NULL)
4715 if (sender_address == NULL ||
4716 (!trusted_caller && filter_test == FTEST_NONE))
4718 uschar *name = US pw->pw_gecos;
4719 uschar *amp = Ustrchr(name, '&');
4722 /* Most Unix specify that a '&' character in the gecos field is
4723 replaced by a copy of the login name, and some even specify that
4724 the first character should be upper cased, so that's what we do. */
4729 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4730 amp - name, name, &loffset, originator_login, amp + 1);
4731 buffer[loffset] = toupper(buffer[loffset]);
4735 /* If a pattern for matching the gecos field was supplied, apply
4736 it and then expand the name string. */
4738 if (gecos_pattern != NULL && gecos_name != NULL)
4741 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4743 if (regex_match_and_setup(re, name, 0, -1))
4745 uschar *new_name = expand_string(gecos_name);
4747 if (new_name != NULL)
4749 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4750 "gecos field \"%s\"\n", new_name, name);
4753 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4754 "\"%s\": %s\n", gecos_name, expand_string_message);
4756 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4757 "gecos field \"%s\"\n", gecos_pattern, name);
4758 store_free((void *)re);
4760 originator_name = string_copy(name);
4763 /* A trusted caller has used -f but not -F */
4765 else originator_name = US"";
4768 /* Break the retry loop */
4773 if (++i > finduser_retries) break;
4777 /* If we cannot get a user login, log the incident and give up, unless the
4778 configuration specifies something to use. When running in the test harness,
4779 any setting of unknown_login overrides the actual name. */
4781 if (originator_login == NULL || running_in_test_harness)
4783 if (unknown_login != NULL)
4785 originator_login = expand_string(unknown_login);
4786 if (originator_name == NULL && unknown_username != NULL)
4787 originator_name = expand_string(unknown_username);
4788 if (originator_name == NULL) originator_name = US"";
4790 if (originator_login == NULL)
4791 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4795 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4798 originator_name = string_copy(parse_fix_phrase(originator_name,
4799 Ustrlen(originator_name), big_buffer, big_buffer_size));
4801 /* If a message is created by this call of Exim, the uid/gid of its originator
4802 are those of the caller. These values are overridden if an existing message is
4803 read in from the spool. */
4805 originator_uid = real_uid;
4806 originator_gid = real_gid;
4808 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4809 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4811 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4812 returns. We leave this till here so that the originator_ fields are available
4813 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4816 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4820 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4821 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4822 "mua_wrapper is set");
4827 /* If the sender ident has not been set (by a trusted caller) set it to
4828 the caller. This will get overwritten below for an inetd call. If a trusted
4829 caller has set it empty, unset it. */
4831 if (sender_ident == NULL) sender_ident = originator_login;
4832 else if (sender_ident[0] == 0) sender_ident = NULL;
4834 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4835 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4836 originator_* variables set. */
4838 if (test_rewrite_arg >= 0)
4840 really_exim = FALSE;
4841 if (test_rewrite_arg >= argc)
4843 printf("-brw needs an address argument\n");
4844 exim_exit(EXIT_FAILURE);
4846 rewrite_test(argv[test_rewrite_arg]);
4847 exim_exit(EXIT_SUCCESS);
4850 /* A locally-supplied message is considered to be coming from a local user
4851 unless a trusted caller supplies a sender address with -f, or is passing in the
4852 message via SMTP (inetd invocation or otherwise). */
4854 if ((sender_address == NULL && !smtp_input) ||
4855 (!trusted_caller && filter_test == FTEST_NONE))
4857 sender_local = TRUE;
4859 /* A trusted caller can supply authenticated_sender and authenticated_id
4860 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4861 defaults except when host checking. */
4863 if (authenticated_sender == NULL && !host_checking)
4864 authenticated_sender = string_sprintf("%s@%s", originator_login,
4865 qualify_domain_sender);
4866 if (authenticated_id == NULL && !host_checking)
4867 authenticated_id = originator_login;
4870 /* Trusted callers are always permitted to specify the sender address.
4871 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4872 is specified is the empty address. However, if a trusted caller does not
4873 specify a sender address for SMTP input, we leave sender_address unset. This
4874 causes the MAIL commands to be honoured. */
4876 if ((!smtp_input && sender_address == NULL) ||
4877 !receive_check_set_sender(sender_address))
4879 /* Either the caller is not permitted to set a general sender, or this is
4880 non-SMTP input and the trusted caller has not set a sender. If there is no
4881 sender, or if a sender other than <> is set, override with the originator's
4882 login (which will get qualified below), except when checking things. */
4884 if (sender_address == NULL /* No sender_address set */
4886 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4887 !checking)) /* Not running tests, including filter tests */
4889 sender_address = originator_login;
4890 sender_address_forced = FALSE;
4891 sender_address_domain = 0;
4895 /* Remember whether an untrusted caller set the sender address */
4897 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4899 /* Ensure that the sender address is fully qualified unless it is the empty
4900 address, which indicates an error message, or doesn't exist (root caller, smtp
4901 interface, no -f argument). */
4903 if (sender_address != NULL && sender_address[0] != 0 &&
4904 sender_address_domain == 0)
4905 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4906 qualify_domain_sender);
4908 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4910 /* Handle a request to verify a list of addresses, or test them for delivery.
4911 This must follow the setting of the sender address, since routers can be
4912 predicated upon the sender. If no arguments are given, read addresses from
4913 stdin. Set debug_level to at least D_v to get full output for address testing.
4916 if (verify_address_mode || address_test_mode)
4919 int flags = vopt_qualify;
4921 if (verify_address_mode)
4923 if (!verify_as_sender) flags |= vopt_is_recipient;
4924 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4929 flags |= vopt_is_recipient;
4930 debug_selector |= D_v;
4931 debug_file = stderr;
4932 debug_fd = fileno(debug_file);
4933 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4936 if (recipients_arg < argc)
4938 while (recipients_arg < argc)
4940 uschar *s = argv[recipients_arg++];
4943 BOOL finished = FALSE;
4944 uschar *ss = parse_find_address_end(s, FALSE);
4945 if (*ss == ',') *ss = 0; else finished = TRUE;
4946 test_address(s, flags, &exit_value);
4949 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4956 uschar *s = get_stdinput(NULL, NULL);
4957 if (s == NULL) break;
4958 test_address(s, flags, &exit_value);
4962 exim_exit(exit_value);
4965 /* Handle expansion checking. Either expand items on the command line, or read
4966 from stdin if there aren't any. If -Mset was specified, load the message so
4967 that its variables can be used, but restrict this facility to admin users.
4968 Otherwise, if -bem was used, read a message from stdin. */
4972 dns_init(FALSE, FALSE, FALSE);
4973 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4975 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4978 fprintf(stderr, "exim: permission denied\n");
4981 message_id = argv[msg_action_arg];
4982 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4983 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4984 printf ("Failed to load message datafile %s\n", message_id);
4985 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4986 printf ("Failed to load message %s\n", message_id);
4989 /* Read a test message from a file. We fudge it up to be on stdin, saving
4990 stdin itself for later reading of expansion strings. */
4992 else if (expansion_test_message != NULL)
4994 int save_stdin = dup(0);
4995 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4998 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5000 return EXIT_FAILURE;
5003 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5004 message_ended = END_NOTENDED;
5005 read_message_body(receive_msg(extract_recipients));
5006 message_linecount += body_linecount;
5007 (void)dup2(save_stdin, 0);
5008 (void)close(save_stdin);
5009 clearerr(stdin); /* Required by Darwin */
5012 /* Allow $recipients for this testing */
5014 enable_dollar_recipients = TRUE;
5016 /* Expand command line items */
5018 if (recipients_arg < argc)
5020 while (recipients_arg < argc)
5022 uschar *s = argv[recipients_arg++];
5023 uschar *ss = expand_string(s);
5024 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5025 else printf("%s\n", CS ss);
5033 char *(*fn_readline)(const char *) = NULL;
5034 void (*fn_addhist)(const char *) = NULL;
5037 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5043 uschar *source = get_stdinput(fn_readline, fn_addhist);
5044 if (source == NULL) break;
5045 ss = expand_string(source);
5047 printf ("Failed: %s\n", expand_string_message);
5048 else printf("%s\n", CS ss);
5052 if (dlhandle != NULL) dlclose(dlhandle);
5056 /* The data file will be open after -Mset */
5058 if (deliver_datafile >= 0)
5060 (void)close(deliver_datafile);
5061 deliver_datafile = -1;
5064 exim_exit(EXIT_SUCCESS);
5068 /* The active host name is normally the primary host name, but it can be varied
5069 for hosts that want to play several parts at once. We need to ensure that it is
5070 set for host checking, and for receiving messages. */
5072 smtp_active_hostname = primary_hostname;
5073 if (raw_active_hostname != NULL)
5075 uschar *nah = expand_string(raw_active_hostname);
5078 if (!expand_string_forcedfail)
5079 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5080 "(smtp_active_hostname): %s", raw_active_hostname,
5081 expand_string_message);
5083 else if (nah[0] != 0) smtp_active_hostname = nah;
5086 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5087 given IP address so that the blocking and relay configuration can be tested.
5088 Unless a sender_ident was set by -oMt, we discard it (the default is the
5089 caller's login name). An RFC 1413 call is made only if we are running in the
5090 test harness and an incoming interface and both ports are specified, because
5091 there is no TCP/IP call to find the ident for. */
5098 if (!sender_ident_set)
5100 sender_ident = NULL;
5101 if (running_in_test_harness && sender_host_port != 0 &&
5102 interface_address != NULL && interface_port != 0)
5103 verify_get_ident(1413);
5106 /* In case the given address is a non-canonical IPv6 address, canonicize
5107 it. The code works for both IPv4 and IPv6, as it happens. */
5109 size = host_aton(sender_host_address, x);
5110 sender_host_address = store_get(48); /* large enough for full IPv6 */
5111 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5113 /* Now set up for testing */
5115 host_build_sender_fullhost();
5119 sender_local = FALSE;
5120 sender_host_notsocket = TRUE;
5121 debug_file = stderr;
5122 debug_fd = fileno(debug_file);
5123 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5124 "**** but without any ident (RFC 1413) callback.\n"
5125 "**** This is not for real!\n\n",
5126 sender_host_address);
5128 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5129 if (verify_check_host(&hosts_connection_nolog) == OK)
5130 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5131 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5133 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5134 because a log line has already been written for all its failure exists
5135 (usually "connection refused: <reason>") and writing another one is
5136 unnecessary clutter. */
5138 if (smtp_start_session())
5140 reset_point = store_get(0);
5143 store_reset(reset_point);
5144 if (smtp_setup_msg() <= 0) break;
5145 if (!receive_msg(FALSE)) break;
5149 exim_exit(EXIT_SUCCESS);
5153 /* Arrange for message reception if recipients or SMTP were specified;
5154 otherwise complain unless a version print (-bV) happened or this is a filter
5155 verification test or info dump.
5156 In the former case, show the configuration file name. */
5158 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5160 if (version_printed)
5162 printf("Configuration file is %s\n", config_main_filename);
5163 return EXIT_SUCCESS;
5166 if (info_flag != CMDINFO_NONE)
5168 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5169 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5172 if (filter_test == FTEST_NONE)
5173 exim_usage(called_as);
5177 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5178 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5179 that we are not called from inetd, because that is rejected above. The
5180 following configuration settings are forced here:
5182 (1) Synchronous delivery (-odi)
5183 (2) Errors to stderr (-oep == -oeq)
5184 (3) No parallel remote delivery
5185 (4) Unprivileged delivery
5187 We don't force overall queueing options because there are several of them;
5188 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5189 to override any SMTP queueing. */
5193 synchronous_delivery = TRUE;
5194 arg_error_handling = ERRORS_STDERR;
5195 remote_max_parallel = 1;
5196 deliver_drop_privilege = TRUE;
5198 queue_smtp_domains = NULL;
5200 message_utf8_downconvert = -1; /* convert-if-needed */
5205 /* Prepare to accept one or more new messages on the standard input. When a
5206 message has been read, its id is returned in message_id[]. If doing immediate
5207 delivery, we fork a delivery process for each received message, except for the
5208 last one, where we can save a process switch.
5210 It is only in non-smtp mode that error_handling is allowed to be changed from
5211 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5212 sendmail error modes other than -oem ever actually used? Later: yes.) */
5214 if (!smtp_input) error_handling = arg_error_handling;
5216 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5217 logging being sent down the socket and make an identd call to get the
5222 (void)fclose(stderr);
5223 exim_nullstd(); /* Re-open to /dev/null */
5224 verify_get_ident(IDENT_PORT);
5225 host_build_sender_fullhost();
5226 set_process_info("handling incoming connection from %s via inetd",
5230 /* If the sender host address has been set, build sender_fullhost if it hasn't
5231 already been done (which it will have been for inetd). This caters for the
5232 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5233 so that the test for IP options is skipped for -bs input. */
5235 if (sender_host_address != NULL && sender_fullhost == NULL)
5237 host_build_sender_fullhost();
5238 set_process_info("handling incoming connection from %s via -oMa",
5240 sender_host_notsocket = TRUE;
5243 /* Otherwise, set the sender host as unknown except for inetd calls. This
5244 prevents host checking in the case of -bs not from inetd and also for -bS. */
5246 else if (!is_inetd) sender_host_unknown = TRUE;
5248 /* If stdout does not exist, then dup stdin to stdout. This can happen
5249 if exim is started from inetd. In this case fd 0 will be set to the socket,
5250 but fd 1 will not be set. This also happens for passed SMTP channels. */
5252 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5254 /* Set up the incoming protocol name and the state of the program. Root is
5255 allowed to force received protocol via the -oMr option above. If we have come
5256 via inetd, the process info has already been set up. We don't set
5257 received_protocol here for smtp input, as it varies according to
5258 batch/HELO/EHLO/AUTH/TLS. */
5262 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5263 smtp_batched_input? "batched " : "",
5264 (sender_address!= NULL)? sender_address : originator_login);
5268 if (received_protocol == NULL)
5269 received_protocol = string_sprintf("local%s", called_as);
5270 set_process_info("accepting a local non-SMTP message from <%s>",
5274 /* Initialize the session_local_queue-only flag (this will be ignored if
5275 mua_wrapper is set) */
5278 session_local_queue_only = queue_only;
5280 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5281 the spool if so configured. On failure, we must not attempt to send an error
5282 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5283 error code is given.) */
5285 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5287 fprintf(stderr, "exim: insufficient disk space\n");
5288 return EXIT_FAILURE;
5291 /* If this is smtp input of any kind, real or batched, handle the start of the
5294 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5295 because a log line has already been written for all its failure exists
5296 (usually "connection refused: <reason>") and writing another one is
5297 unnecessary clutter. */
5303 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5304 if (verify_check_host(&hosts_connection_nolog) == OK)
5305 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5306 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5307 if (!smtp_start_session())
5310 exim_exit(EXIT_SUCCESS);
5314 /* Otherwise, set up the input size limit here. */
5318 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5319 if (expand_string_message != NULL)
5321 if (thismessage_size_limit == -1)
5322 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5323 "message_size_limit: %s", expand_string_message);
5325 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5326 "message_size_limit: %s", expand_string_message);
5330 /* Loop for several messages when reading SMTP input. If we fork any child
5331 processes, we don't want to wait for them unless synchronous delivery is
5332 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5333 same as SIG_DFL, despite the fact that documentation often lists the default as
5334 "ignore". This is a confusing area. This is what I know:
5336 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5337 processes that complete simply to go away without ever becoming defunct. You
5338 can't then wait for them - but we don't want to wait for them in the
5339 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5340 happen for all OS (e.g. *BSD is different).
5342 But that's not the end of the story. Some (many? all?) systems have the
5343 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5344 has by default, so it seems that the difference is merely one of default
5345 (compare restarting vs non-restarting signals).
5347 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5348 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5349 of the loop below. Paranoia rules.
5351 February 2003: That's *still* not the end of the story. There are now versions
5352 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5353 process then calls waitpid(), a grumble is written to the system log, because
5354 this is logically inconsistent. In other words, it doesn't like the paranoia.
5355 As a consequenc of this, the waitpid() below is now excluded if we are sure
5356 that SIG_IGN works. */
5358 if (!synchronous_delivery)
5361 struct sigaction act;
5362 act.sa_handler = SIG_IGN;
5363 sigemptyset(&(act.sa_mask));
5364 act.sa_flags = SA_NOCLDWAIT;
5365 sigaction(SIGCHLD, &act, NULL);
5367 signal(SIGCHLD, SIG_IGN);
5371 /* Save the current store pool point, for resetting at the start of
5372 each message, and save the real sender address, if any. */
5374 reset_point = store_get(0);
5375 real_sender_address = sender_address;
5377 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5378 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5383 store_reset(reset_point);
5386 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5387 input and build the recipients list, before calling receive_msg() to read the
5388 message proper. Whatever sender address is given in the SMTP transaction is
5389 often ignored for local senders - we use the actual sender, which is normally
5390 either the underlying user running this process or a -f argument provided by
5391 a trusted caller. It is saved in real_sender_address. The test for whether to
5392 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5397 if ((rc = smtp_setup_msg()) > 0)
5399 if (real_sender_address != NULL &&
5400 !receive_check_set_sender(sender_address))
5402 sender_address = raw_sender = real_sender_address;
5403 sender_address_unrewritten = NULL;
5406 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5407 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5408 the very end. The result of the ACL is ignored (as for other non-SMTP
5409 messages). It is run for its potential side effects. */
5411 if (smtp_batched_input && acl_not_smtp_start != NULL)
5413 uschar *user_msg, *log_msg;
5414 enable_dollar_recipients = TRUE;
5415 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5416 &user_msg, &log_msg);
5417 enable_dollar_recipients = FALSE;
5420 /* Now get the data for the message */
5422 more = receive_msg(extract_recipients);
5423 if (message_id[0] == 0)
5426 smtp_log_no_mail(); /* Log no mail if configured */
5427 exim_exit(EXIT_FAILURE);
5432 smtp_log_no_mail(); /* Log no mail if configured */
5433 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5437 /* In the non-SMTP case, we have all the information from the command
5438 line, but must process it in case it is in the more general RFC822
5439 format, and in any case, to detect syntax errors. Also, it appears that
5440 the use of comma-separated lists as single arguments is common, so we
5441 had better support them. */
5447 int count = argc - recipients_arg;
5448 uschar **list = argv + recipients_arg;
5450 /* These options cannot be changed dynamically for non-SMTP messages */
5452 active_local_sender_retain = local_sender_retain;
5453 active_local_from_check = local_from_check;
5455 /* Save before any rewriting */
5457 raw_sender = string_copy(sender_address);
5459 /* Loop for each argument */
5461 for (i = 0; i < count; i++)
5463 int start, end, domain;
5465 uschar *s = list[i];
5467 /* Loop for each comma-separated address */
5471 BOOL finished = FALSE;
5473 uschar *ss = parse_find_address_end(s, FALSE);
5475 if (*ss == ',') *ss = 0; else finished = TRUE;
5477 /* Check max recipients - if -t was used, these aren't recipients */
5479 if (recipients_max > 0 && ++rcount > recipients_max &&
5480 !extract_recipients)
5481 if (error_handling == ERRORS_STDERR)
5483 fprintf(stderr, "exim: too many recipients\n");
5484 exim_exit(EXIT_FAILURE);
5489 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5490 errors_sender_rc : EXIT_FAILURE;
5495 BOOL b = allow_utf8_domains;
5496 allow_utf8_domains = TRUE;
5499 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5502 if (string_is_utf8(recipient))
5503 message_smtputf8 = TRUE;
5505 allow_utf8_domains = b;
5508 if (domain == 0 && !allow_unqualified_recipient)
5511 errmess = US"unqualified recipient address not allowed";
5514 if (recipient == NULL)
5516 if (error_handling == ERRORS_STDERR)
5518 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5519 string_printing(list[i]), errmess);
5520 exim_exit(EXIT_FAILURE);
5526 eblock.text1 = string_printing(list[i]);
5527 eblock.text2 = errmess;
5529 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5530 errors_sender_rc : EXIT_FAILURE;
5534 receive_add_recipient(recipient, -1);
5537 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5541 /* Show the recipients when debugging */
5546 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5547 if (recipients_list != NULL)
5549 debug_printf("Recipients:\n");
5550 for (i = 0; i < recipients_count; i++)
5551 debug_printf(" %s\n", recipients_list[i].address);
5555 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5556 ignored; rejecting here would just add complication, and it can just as
5557 well be done later. Allow $recipients to be visible in the ACL. */
5559 if (acl_not_smtp_start != NULL)
5561 uschar *user_msg, *log_msg;
5562 enable_dollar_recipients = TRUE;
5563 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5564 &user_msg, &log_msg);
5565 enable_dollar_recipients = FALSE;
5568 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5569 will just read the headers for the message, and not write anything onto the
5572 message_ended = END_NOTENDED;
5573 more = receive_msg(extract_recipients);
5575 /* more is always FALSE here (not SMTP message) when reading a message
5576 for real; when reading the headers of a message for filter testing,
5577 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5579 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5580 } /* Non-SMTP message reception */
5582 /* If this is a filter testing run, there are headers in store, but
5583 no message on the spool. Run the filtering code in testing mode, setting
5584 the domain to the qualify domain and the local part to the current user,
5585 unless they have been set by options. The prefix and suffix are left unset
5586 unless specified. The the return path is set to to the sender unless it has
5587 already been set from a return-path header in the message. */
5589 if (filter_test != FTEST_NONE)
5591 deliver_domain = (ftest_domain != NULL)?
5592 ftest_domain : qualify_domain_recipient;
5593 deliver_domain_orig = deliver_domain;
5594 deliver_localpart = (ftest_localpart != NULL)?
5595 ftest_localpart : originator_login;
5596 deliver_localpart_orig = deliver_localpart;
5597 deliver_localpart_prefix = ftest_prefix;
5598 deliver_localpart_suffix = ftest_suffix;
5599 deliver_home = originator_home;
5601 if (return_path == NULL)
5603 printf("Return-path copied from sender\n");
5604 return_path = string_copy(sender_address);
5607 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5608 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5610 receive_add_recipient(
5611 string_sprintf("%s%s%s@%s",
5612 (ftest_prefix == NULL)? US"" : ftest_prefix,
5614 (ftest_suffix == NULL)? US"" : ftest_suffix,
5615 deliver_domain), -1);
5617 printf("Recipient = %s\n", recipients_list[0].address);
5618 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5619 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5621 if (chdir("/")) /* Get away from wherever the user is running this from */
5623 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5624 exim_exit(EXIT_FAILURE);
5627 /* Now we run either a system filter test, or a user filter test, or both.
5628 In the latter case, headers added by the system filter will persist and be
5629 available to the user filter. We need to copy the filter variables
5632 if ((filter_test & FTEST_SYSTEM) != 0)
5634 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5635 exim_exit(EXIT_FAILURE);
5638 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5640 if ((filter_test & FTEST_USER) != 0)
5642 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5643 exim_exit(EXIT_FAILURE);
5646 exim_exit(EXIT_SUCCESS);
5649 /* Else act on the result of message reception. We should not get here unless
5650 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5651 will be TRUE. If it is not, check on the number of messages received in this
5654 if (!session_local_queue_only &&
5655 smtp_accept_queue_per_connection > 0 &&
5656 receive_messagecount > smtp_accept_queue_per_connection)
5658 session_local_queue_only = TRUE;
5659 queue_only_reason = 2;
5662 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5663 and queue_only_load is set, check that the load average is below it. If it is
5664 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5665 default), we put the whole session into queue_only mode. It then remains this
5666 way for any subsequent messages on the same SMTP connection. This is a
5667 deliberate choice; even though the load average may fall, it doesn't seem
5668 right to deliver later messages on the same call when not delivering earlier
5669 ones. However, there are odd cases where this is not wanted, so this can be
5670 changed by setting queue_only_load_latch false. */
5672 local_queue_only = session_local_queue_only;
5673 if (!local_queue_only && queue_only_load >= 0)
5675 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5676 if (local_queue_only)
5678 queue_only_reason = 3;
5679 if (queue_only_load_latch) session_local_queue_only = TRUE;
5683 /* If running as an MUA wrapper, all queueing options and freezing options
5687 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5689 /* Log the queueing here, when it will get a message id attached, but
5690 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5693 if (local_queue_only) switch(queue_only_reason)
5696 log_write(L_delay_delivery,
5697 LOG_MAIN, "no immediate delivery: more than %d messages "
5698 "received in one connection", smtp_accept_queue_per_connection);
5702 log_write(L_delay_delivery,
5703 LOG_MAIN, "no immediate delivery: load average %.2f",
5704 (double)load_average/1000.0);
5708 /* Else do the delivery unless the ACL or local_scan() called for queue only
5709 or froze the message. Always deliver in a separate process. A fork failure is
5710 not a disaster, as the delivery will eventually happen on a subsequent queue
5711 run. The search cache must be tidied before the fork, as the parent will
5712 do it before exiting. The child will trigger a lookup failure and
5713 thereby defer the delivery if it tries to use (for example) a cached ldap
5714 connection that the parent has called unbind on. */
5716 else if (!queue_only_policy && !deliver_freeze)
5721 if ((pid = fork()) == 0)
5724 close_unwanted(); /* Close unwanted file descriptors and TLS */
5725 exim_nullstd(); /* Ensure std{in,out,err} exist */
5727 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5728 mode, deliver_drop_privilege is forced TRUE). */
5730 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5732 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5733 2, US"-Mc", message_id);
5734 /* Control does not return here. */
5737 /* No need to re-exec */
5739 rc = deliver_message(message_id, FALSE, FALSE);
5741 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5742 EXIT_SUCCESS : EXIT_FAILURE);
5747 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5748 "process: %s", strerror(errno));
5751 /* In the parent, wait if synchronous delivery is required. This will
5752 always be the case in MUA wrapper mode. */
5754 else if (synchronous_delivery)
5757 while (wait(&status) != pid);
5758 if ((status & 0x00ff) != 0)
5759 log_write(0, LOG_MAIN|LOG_PANIC,
5760 "process %d crashed with signal %d while delivering %s",
5761 (int)pid, status & 0x00ff, message_id);
5762 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5766 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5767 automatically reaps children (see comments above the loop), clear away any
5768 finished subprocesses here, in case there are lots of messages coming in
5769 from the same source. */
5771 #ifndef SIG_IGN_WORKS
5772 while (waitpid(-1, NULL, WNOHANG) > 0);
5776 exim_exit(EXIT_SUCCESS); /* Never returns */
5777 return 0; /* To stop compiler warning */