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_LMDB
846 fprintf(f, " Experimental_LMDB");
848 #ifdef EXPERIMENTAL_SPF
849 fprintf(f, " Experimental_SPF");
851 #ifdef EXPERIMENTAL_SRS
852 fprintf(f, " Experimental_SRS");
854 #ifdef EXPERIMENTAL_BRIGHTMAIL
855 fprintf(f, " Experimental_Brightmail");
857 #ifdef EXPERIMENTAL_DANE
858 fprintf(f, " Experimental_DANE");
860 #ifdef EXPERIMENTAL_DCC
861 fprintf(f, " Experimental_DCC");
863 #ifdef EXPERIMENTAL_DMARC
864 fprintf(f, " Experimental_DMARC");
866 #ifdef EXPERIMENTAL_DSN_INFO
867 fprintf(f, " Experimental_DSN_info");
871 fprintf(f, "Lookups (built-in):");
872 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
873 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
875 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
878 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
879 fprintf(f, " dbm dbmjz dbmnz");
881 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
882 fprintf(f, " dnsdb");
884 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
885 fprintf(f, " dsearch");
887 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
888 fprintf(f, " ibase");
890 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
891 fprintf(f, " ldap ldapdn ldapm");
893 #ifdef EXPERIMENTAL_LMDB
896 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
897 fprintf(f, " mysql");
899 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
900 fprintf(f, " nis nis0");
902 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
903 fprintf(f, " nisplus");
905 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
906 fprintf(f, " oracle");
908 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
909 fprintf(f, " passwd");
911 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
912 fprintf(f, " pgsql");
914 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
915 fprintf(f, " redis");
917 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
918 fprintf(f, " sqlite");
920 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
921 fprintf(f, " testdb");
923 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
924 fprintf(f, " whoson");
928 fprintf(f, "Authenticators:");
930 fprintf(f, " cram_md5");
932 #ifdef AUTH_CYRUS_SASL
933 fprintf(f, " cyrus_sasl");
936 fprintf(f, " dovecot");
939 fprintf(f, " gsasl");
941 #ifdef AUTH_HEIMDAL_GSSAPI
942 fprintf(f, " heimdal_gssapi");
944 #ifdef AUTH_PLAINTEXT
945 fprintf(f, " plaintext");
955 fprintf(f, "Routers:");
957 fprintf(f, " accept");
959 #ifdef ROUTER_DNSLOOKUP
960 fprintf(f, " dnslookup");
962 #ifdef ROUTER_IPLITERAL
963 fprintf(f, " ipliteral");
965 #ifdef ROUTER_IPLOOKUP
966 fprintf(f, " iplookup");
968 #ifdef ROUTER_MANUALROUTE
969 fprintf(f, " manualroute");
971 #ifdef ROUTER_QUERYPROGRAM
972 fprintf(f, " queryprogram");
974 #ifdef ROUTER_REDIRECT
975 fprintf(f, " redirect");
979 fprintf(f, "Transports:");
980 #ifdef TRANSPORT_APPENDFILE
981 fprintf(f, " appendfile");
982 #ifdef SUPPORT_MAILDIR
983 fprintf(f, "/maildir");
985 #ifdef SUPPORT_MAILSTORE
986 fprintf(f, "/mailstore");
992 #ifdef TRANSPORT_AUTOREPLY
993 fprintf(f, " autoreply");
995 #ifdef TRANSPORT_LMTP
998 #ifdef TRANSPORT_PIPE
1001 #ifdef TRANSPORT_SMTP
1002 fprintf(f, " smtp");
1006 if (fixed_never_users[0] > 0)
1009 fprintf(f, "Fixed never_users: ");
1010 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1011 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1012 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1015 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1017 /* Everything else is details which are only worth reporting when debugging.
1018 Perhaps the tls_version_report should move into this too. */
1023 /* clang defines __GNUC__ (at least, for me) so test for it first */
1024 #if defined(__clang__)
1025 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1026 #elif defined(__GNUC__)
1027 fprintf(f, "Compiler: GCC [%s]\n",
1031 "? unknown version ?"
1035 fprintf(f, "Compiler: <unknown>\n");
1039 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1040 __GLIBC__, __GLIBC_MINOR__);
1041 if (__GLIBC_PREREQ(2, 1))
1042 fprintf(f, " Runtime: %s\n",
1043 gnu_get_libc_version());
1047 tls_version_report(f);
1050 utf8_version_report(f);
1053 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1054 if (authi->version_report)
1055 (*authi->version_report)(f);
1057 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1058 characters; unless it's an ancient version of PCRE in which case it
1060 #ifndef PCRE_PRERELEASE
1061 # define PCRE_PRERELEASE
1064 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1065 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1067 PCRE_MAJOR, PCRE_MINOR,
1068 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1071 #undef EXPAND_AND_QUOTE
1074 for (i = 0; i < lookup_list_count; i++)
1075 if (lookup_list[i]->version_report)
1076 lookup_list[i]->version_report(f);
1078 #ifdef WHITELIST_D_MACROS
1079 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1081 fprintf(f, "WHITELIST_D_MACROS unset\n");
1083 #ifdef TRUSTED_CONFIG_LIST
1084 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1086 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1093 /*************************************************
1094 * Show auxiliary information about Exim *
1095 *************************************************/
1098 show_exim_information(enum commandline_info request, FILE *stream)
1105 fprintf(stream, "Oops, something went wrong.\n");
1109 "The -bI: flag takes a string indicating which information to provide.\n"
1110 "If the string is not recognised, you'll get this help (on stderr).\n"
1112 " exim -bI:help this information\n"
1113 " exim -bI:dscp dscp value keywords known\n"
1114 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1118 for (pp = exim_sieve_extension_list; *pp; ++pp)
1119 fprintf(stream, "%s\n", *pp);
1122 dscp_list_to_stream(stream);
1128 /*************************************************
1129 * Quote a local part *
1130 *************************************************/
1132 /* This function is used when a sender address or a From: or Sender: header
1133 line is being created from the caller's login, or from an authenticated_id. It
1134 applies appropriate quoting rules for a local part.
1136 Argument: the local part
1137 Returns: the local part, quoted if necessary
1141 local_part_quote(uschar *lpart)
1143 BOOL needs_quote = FALSE;
1148 for (t = lpart; !needs_quote && *t != 0; t++)
1150 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1151 (*t != '.' || t == lpart || t[1] == 0);
1154 if (!needs_quote) return lpart;
1157 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1161 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1164 yield = string_cat(yield, &size, &ptr, lpart);
1167 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1168 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1169 yield = string_catn(yield, &size, &ptr, nq, 1);
1173 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1181 /*************************************************
1182 * Load readline() functions *
1183 *************************************************/
1185 /* This function is called from testing executions that read data from stdin,
1186 but only when running as the calling user. Currently, only -be does this. The
1187 function loads the readline() function library and passes back the functions.
1188 On some systems, it needs the curses library, so load that too, but try without
1189 it if loading fails. All this functionality has to be requested at build time.
1192 fn_readline_ptr pointer to where to put the readline pointer
1193 fn_addhist_ptr pointer to where to put the addhistory function
1195 Returns: the dlopen handle or NULL on failure
1199 set_readline(char * (**fn_readline_ptr)(const char *),
1200 void (**fn_addhist_ptr)(const char *))
1203 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1205 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1206 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1208 if (dlhandle != NULL)
1210 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1211 * char * readline (const char *prompt);
1212 * void add_history (const char *string);
1214 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1215 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1219 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1228 /*************************************************
1229 * Get a line from stdin for testing things *
1230 *************************************************/
1232 /* This function is called when running tests that can take a number of lines
1233 of input (for example, -be and -bt). It handles continuations and trailing
1234 spaces. And prompting and a blank line output on eof. If readline() is in use,
1235 the arguments are non-NULL and provide the relevant functions.
1238 fn_readline readline function or NULL
1239 fn_addhist addhist function or NULL
1241 Returns: pointer to dynamic memory, or NULL at end of file
1245 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1250 uschar *yield = NULL;
1252 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1256 uschar buffer[1024];
1260 char *readline_line = NULL;
1261 if (fn_readline != NULL)
1263 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1264 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1265 p = US readline_line;
1270 /* readline() not in use */
1273 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1277 /* Handle the line */
1279 ss = p + (int)Ustrlen(p);
1280 while (ss > p && isspace(ss[-1])) ss--;
1284 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1287 yield = string_catn(yield, &size, &ptr, p, ss - p);
1290 if (fn_readline != NULL) free(readline_line);
1293 /* yield can only be NULL if ss==p */
1294 if (ss == p || yield[ptr-1] != '\\')
1296 if (yield) yield[ptr] = 0;
1302 if (yield == NULL) printf("\n");
1308 /*************************************************
1309 * Output usage information for the program *
1310 *************************************************/
1312 /* This function is called when there are no recipients
1313 or a specific --help argument was added.
1316 progname information on what name we were called by
1318 Returns: DOES NOT RETURN
1322 exim_usage(uschar *progname)
1325 /* Handle specific program invocation varients */
1326 if (Ustrcmp(progname, US"-mailq") == 0)
1329 "mailq - list the contents of the mail queue\n\n"
1330 "For a list of options, see the Exim documentation.\n");
1334 /* Generic usage - we output this whatever happens */
1336 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1337 "not directly from a shell command line. Options and/or arguments control\n"
1338 "what it does when called. For a list of options, see the Exim documentation.\n");
1345 /*************************************************
1346 * Validate that the macros given are okay *
1347 *************************************************/
1349 /* Typically, Exim will drop privileges if macros are supplied. In some
1350 cases, we want to not do so.
1352 Arguments: none (macros is a global)
1353 Returns: true if trusted, false otherwise
1357 macros_trusted(void)
1359 #ifdef WHITELIST_D_MACROS
1361 uschar *whitelisted, *end, *p, **whites, **w;
1362 int white_count, i, n;
1364 BOOL prev_char_item, found;
1369 #ifndef WHITELIST_D_MACROS
1373 /* We only trust -D overrides for some invoking users:
1374 root, the exim run-time user, the optional config owner user.
1375 I don't know why config-owner would be needed, but since they can own the
1376 config files anyway, there's no security risk to letting them override -D. */
1377 if ( ! ((real_uid == root_uid)
1378 || (real_uid == exim_uid)
1379 #ifdef CONFIGURE_OWNER
1380 || (real_uid == config_uid)
1384 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1388 /* Get a list of macros which are whitelisted */
1389 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1390 prev_char_item = FALSE;
1392 for (p = whitelisted; *p != '\0'; ++p)
1394 if (*p == ':' || isspace(*p))
1399 prev_char_item = FALSE;
1402 if (!prev_char_item)
1403 prev_char_item = TRUE;
1410 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1411 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1416 if (i == white_count)
1418 while (*p != '\0' && p < end)
1424 /* The list of macros should be very short. Accept the N*M complexity. */
1425 for (m = macros; m != NULL; m = m->next)
1428 for (w = whites; *w; ++w)
1429 if (Ustrcmp(*w, m->name) == 0)
1436 if (m->replacement == NULL)
1438 len = Ustrlen(m->replacement);
1441 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1442 0, PCRE_EOPT, NULL, 0);
1445 if (n != PCRE_ERROR_NOMATCH)
1446 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1450 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1456 /*************************************************
1457 * Entry point and high-level code *
1458 *************************************************/
1460 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1461 the appropriate action. All the necessary functions are present in the one
1462 binary. I originally thought one should split it up, but it turns out that so
1463 much of the apparatus is needed in each chunk that one might as well just have
1464 it all available all the time, which then makes the coding easier as well.
1467 argc count of entries in argv
1468 argv argument strings, with argv[0] being the program name
1470 Returns: EXIT_SUCCESS if terminated successfully
1471 EXIT_FAILURE otherwise, except when a message has been sent
1472 to the sender, and -oee was given
1476 main(int argc, char **cargv)
1478 uschar **argv = USS cargv;
1479 int arg_receive_timeout = -1;
1480 int arg_smtp_receive_timeout = -1;
1481 int arg_error_handling = error_handling;
1482 int filter_sfd = -1;
1483 int filter_ufd = -1;
1486 int list_queue_option = 0;
1488 int msg_action_arg = -1;
1489 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1490 int queue_only_reason = 0;
1492 int perl_start_option = 0;
1494 int recipients_arg = argc;
1495 int sender_address_domain = 0;
1496 int test_retry_arg = -1;
1497 int test_rewrite_arg = -1;
1498 BOOL arg_queue_only = FALSE;
1499 BOOL bi_option = FALSE;
1500 BOOL checking = FALSE;
1501 BOOL count_queue = FALSE;
1502 BOOL expansion_test = FALSE;
1503 BOOL extract_recipients = FALSE;
1504 BOOL flag_G = FALSE;
1505 BOOL flag_n = FALSE;
1506 BOOL forced_delivery = FALSE;
1507 BOOL f_end_dot = FALSE;
1508 BOOL deliver_give_up = FALSE;
1509 BOOL list_queue = FALSE;
1510 BOOL list_options = FALSE;
1511 BOOL list_config = FALSE;
1512 BOOL local_queue_only;
1514 BOOL one_msg_action = FALSE;
1515 BOOL queue_only_set = FALSE;
1516 BOOL receiving_message = TRUE;
1517 BOOL sender_ident_set = FALSE;
1518 BOOL session_local_queue_only;
1520 BOOL removed_privilege = FALSE;
1521 BOOL usage_wanted = FALSE;
1522 BOOL verify_address_mode = FALSE;
1523 BOOL verify_as_sender = FALSE;
1524 BOOL version_printed = FALSE;
1525 uschar *alias_arg = NULL;
1526 uschar *called_as = US"";
1527 uschar *cmdline_syslog_name = NULL;
1528 uschar *start_queue_run_id = NULL;
1529 uschar *stop_queue_run_id = NULL;
1530 uschar *expansion_test_message = NULL;
1531 uschar *ftest_domain = NULL;
1532 uschar *ftest_localpart = NULL;
1533 uschar *ftest_prefix = NULL;
1534 uschar *ftest_suffix = NULL;
1535 uschar *log_oneline = NULL;
1536 uschar *malware_test_file = NULL;
1537 uschar *real_sender_address;
1538 uschar *originator_home = US"/";
1543 struct stat statbuf;
1544 pid_t passed_qr_pid = (pid_t)0;
1545 int passed_qr_pipe = -1;
1546 gid_t group_list[NGROUPS_MAX];
1548 /* For the -bI: flag */
1549 enum commandline_info info_flag = CMDINFO_NONE;
1550 BOOL info_stdout = FALSE;
1552 /* Possible options for -R and -S */
1554 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1556 /* Need to define this in case we need to change the environment in order
1557 to get rid of a bogus time zone. We have to make it char rather than uschar
1558 because some OS define it in /usr/include/unistd.h. */
1560 extern char **environ;
1562 /* If the Exim user and/or group and/or the configuration file owner/group were
1563 defined by ref:name at build time, we must now find the actual uid/gid values.
1564 This is a feature to make the lives of binary distributors easier. */
1566 #ifdef EXIM_USERNAME
1567 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1571 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1575 /* If ref:name uses a number as the name, route_finduser() returns
1576 TRUE with exim_uid set and pw coerced to NULL. */
1578 exim_gid = pw->pw_gid;
1579 #ifndef EXIM_GROUPNAME
1583 "exim: ref:name should specify a usercode, not a group.\n"
1584 "exim: can't let you get away with it unless you also specify a group.\n");
1591 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1597 #ifdef EXIM_GROUPNAME
1598 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1600 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1606 #ifdef CONFIGURE_OWNERNAME
1607 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1609 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1610 CONFIGURE_OWNERNAME);
1615 /* We default the system_filter_user to be the Exim run-time user, as a
1616 sane non-root value. */
1617 system_filter_uid = exim_uid;
1619 #ifdef CONFIGURE_GROUPNAME
1620 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1622 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1623 CONFIGURE_GROUPNAME);
1628 /* In the Cygwin environment, some initialization used to need doing.
1629 It was fudged in by means of this macro; now no longer but we'll leave
1630 it in case of others. */
1636 /* Check a field which is patched when we are running Exim within its
1637 testing harness; do a fast initial check, and then the whole thing. */
1639 running_in_test_harness =
1640 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1642 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1643 at the start of a program; however, it seems that some environments do not
1644 follow this. A "strange" locale can affect the formatting of timestamps, so we
1647 setlocale(LC_ALL, "C");
1649 /* Set up the default handler for timing using alarm(). */
1651 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1653 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1654 because store_malloc writes a log entry on failure. */
1656 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1657 if (log_buffer == NULL)
1659 fprintf(stderr, "exim: failed to get store for log buffer\n");
1663 /* Initialize the default log options. */
1665 bits_set(log_selector, log_selector_size, log_default);
1667 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1668 NULL when the daemon is run and the file is closed. We have to use this
1669 indirection, because some systems don't allow writing to the variable "stderr".
1672 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1674 /* Arrange for the PCRE regex library to use our store functions. Note that
1675 the normal calls are actually macros that add additional arguments for
1676 debugging purposes so we have to assign specially constructed functions here.
1677 The default is to use store in the stacking pool, but this is overridden in the
1678 regex_must_compile() function. */
1680 pcre_malloc = function_store_get;
1681 pcre_free = function_dummy_free;
1683 /* Ensure there is a big buffer for temporary use in several places. It is put
1684 in malloc store so that it can be freed for enlargement if necessary. */
1686 big_buffer = store_malloc(big_buffer_size);
1688 /* Set up the handler for the data request signal, and set the initial
1689 descriptive text. */
1691 set_process_info("initializing");
1692 os_restarting_signal(SIGUSR1, usr1_handler);
1694 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1695 in the daemon code. For the rest of Exim's uses, we ignore it. */
1697 signal(SIGHUP, SIG_IGN);
1699 /* We don't want to die on pipe errors as the code is written to handle
1700 the write error instead. */
1702 signal(SIGPIPE, SIG_IGN);
1704 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1705 set to SIG_IGN. This causes subprocesses that complete before the parent
1706 process waits for them not to hang around, so when Exim calls wait(), nothing
1707 is there. The wait() code has been made robust against this, but let's ensure
1708 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1709 ending status. We use sigaction rather than plain signal() on those OS where
1710 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1711 problem on AIX with this.) */
1715 struct sigaction act;
1716 act.sa_handler = SIG_DFL;
1717 sigemptyset(&(act.sa_mask));
1719 sigaction(SIGCHLD, &act, NULL);
1722 signal(SIGCHLD, SIG_DFL);
1725 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1730 /* Set up the version number. Set up the leading 'E' for the external form of
1731 message ids, set the pointer to the internal form, and initialize it to
1732 indicate no message being processed. */
1735 message_id_option[0] = '-';
1736 message_id_external = message_id_option + 1;
1737 message_id_external[0] = 'E';
1738 message_id = message_id_external + 1;
1741 /* Set the umask to zero so that any files Exim creates using open() are
1742 created with the modes that it specifies. NOTE: Files created with fopen() have
1743 a problem, which was not recognized till rather late (February 2006). With this
1744 umask, such files will be world writeable. (They are all content scanning files
1745 in the spool directory, which isn't world-accessible, so this is not a
1746 disaster, but it's untidy.) I don't want to change this overall setting,
1747 however, because it will interact badly with the open() calls. Instead, there's
1748 now a function called modefopen() that fiddles with the umask while calling
1753 /* Precompile the regular expression for matching a message id. Keep this in
1754 step with the code that generates ids in the accept.c module. We need to do
1755 this here, because the -M options check their arguments for syntactic validity
1756 using mac_ismsgid, which uses this. */
1759 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1761 /* Precompile the regular expression that is used for matching an SMTP error
1762 code, possibly extended, at the start of an error message. Note that the
1763 terminating whitespace character is included. */
1766 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1769 #ifdef WHITELIST_D_MACROS
1770 /* Precompile the regular expression used to filter the content of macros
1771 given to -D for permissibility. */
1773 regex_whitelisted_macro =
1774 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1777 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1779 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1780 this seems to be a generally accepted convention, since one finds symbolic
1781 links called "mailq" in standard OS configurations. */
1783 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1784 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1787 receiving_message = FALSE;
1788 called_as = US"-mailq";
1791 /* If the program is called as "rmail" treat it as equivalent to
1792 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1793 i.e. preventing a single dot on a line from terminating the message, and
1794 returning with zero return code, even in cases of error (provided an error
1795 message has been sent). */
1797 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1798 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1801 called_as = US"-rmail";
1802 errors_sender_rc = EXIT_SUCCESS;
1805 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1806 this is a smail convention. */
1808 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1809 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1811 smtp_input = smtp_batched_input = TRUE;
1812 called_as = US"-rsmtp";
1815 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1816 this is a smail convention. */
1818 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1819 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1822 receiving_message = FALSE;
1823 called_as = US"-runq";
1826 /* If the program is called as "newaliases" treat it as equivalent to
1827 "exim -bi"; this is a sendmail convention. */
1829 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1830 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1833 receiving_message = FALSE;
1834 called_as = US"-newaliases";
1837 /* Save the original effective uid for a couple of uses later. It should
1838 normally be root, but in some esoteric environments it may not be. */
1840 original_euid = geteuid();
1842 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1843 to be the same as the real ones. This makes a difference only if Exim is setuid
1844 (or setgid) to something other than root, which could be the case in some
1845 special configurations. */
1847 real_uid = getuid();
1848 real_gid = getgid();
1850 if (real_uid == root_uid)
1852 rv = setgid(real_gid);
1855 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1856 (long int)real_gid, strerror(errno));
1859 rv = setuid(real_uid);
1862 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1863 (long int)real_uid, strerror(errno));
1868 /* If neither the original real uid nor the original euid was root, Exim is
1869 running in an unprivileged state. */
1871 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1873 /* Scan the program's arguments. Some can be dealt with right away; others are
1874 simply recorded for checking and handling afterwards. Do a high-level switch
1875 on the second character (the one after '-'), to save some effort. */
1877 for (i = 1; i < argc; i++)
1879 BOOL badarg = FALSE;
1880 uschar *arg = argv[i];
1884 /* An argument not starting with '-' is the start of a recipients list;
1885 break out of the options-scanning loop. */
1893 /* An option consistion of -- terminates the options */
1895 if (Ustrcmp(arg, "--") == 0)
1897 recipients_arg = i + 1;
1901 /* Handle flagged options */
1903 switchchar = arg[1];
1906 /* Make all -ex options synonymous with -oex arguments, since that
1907 is assumed by various callers. Also make -qR options synonymous with -R
1908 options, as that seems to be required as well. Allow for -qqR too, and
1909 the same for -S options. */
1911 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1912 Ustrncmp(arg+1, "qR", 2) == 0 ||
1913 Ustrncmp(arg+1, "qS", 2) == 0)
1915 switchchar = arg[2];
1918 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1920 switchchar = arg[3];
1922 queue_2stage = TRUE;
1925 /* Make -r synonymous with -f, since it is a documented alias */
1927 else if (arg[1] == 'r') switchchar = 'f';
1929 /* Make -ov synonymous with -v */
1931 else if (Ustrcmp(arg, "-ov") == 0)
1937 /* deal with --option_aliases */
1938 else if (switchchar == '-')
1940 if (Ustrcmp(argrest, "help") == 0)
1942 usage_wanted = TRUE;
1945 else if (Ustrcmp(argrest, "version") == 0)
1952 /* High-level switch on active initial letter */
1957 /* sendmail uses -Ac and -Am to control which .cf file is used;
1960 if (*argrest == '\0') { badarg = TRUE; break; }
1963 BOOL ignore = FALSE;
1968 if (*(argrest + 1) == '\0')
1972 if (!ignore) { badarg = TRUE; break; }
1976 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1977 so has no need of it. */
1980 if (*argrest == 0) i++; /* Skip over the type */
1985 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1987 /* -bd: Run in daemon mode, awaiting SMTP connections.
1988 -bdf: Ditto, but in the foreground.
1991 if (*argrest == 'd')
1993 daemon_listen = TRUE;
1994 if (*(++argrest) == 'f') background_daemon = FALSE;
1995 else if (*argrest != 0) { badarg = TRUE; break; }
1998 /* -be: Run in expansion test mode
1999 -bem: Ditto, but read a message from a file first
2002 else if (*argrest == 'e')
2004 expansion_test = checking = TRUE;
2005 if (argrest[1] == 'm')
2007 if (++i >= argc) { badarg = TRUE; break; }
2008 expansion_test_message = argv[i];
2011 if (argrest[1] != 0) { badarg = TRUE; break; }
2014 /* -bF: Run system filter test */
2016 else if (*argrest == 'F')
2018 filter_test |= checking = FTEST_SYSTEM;
2019 if (*(++argrest) != 0) { badarg = TRUE; break; }
2020 if (++i < argc) filter_test_sfile = argv[i]; else
2022 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2027 /* -bf: Run user filter test
2028 -bfd: Set domain for filter testing
2029 -bfl: Set local part for filter testing
2030 -bfp: Set prefix for filter testing
2031 -bfs: Set suffix for filter testing
2034 else if (*argrest == 'f')
2036 if (*(++argrest) == 0)
2038 filter_test |= checking = FTEST_USER;
2039 if (++i < argc) filter_test_ufile = argv[i]; else
2041 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2049 fprintf(stderr, "exim: string expected after %s\n", arg);
2052 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2053 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2054 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2055 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2056 else { badarg = TRUE; break; }
2060 /* -bh: Host checking - an IP address must follow. */
2062 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2064 if (++i >= argc) { badarg = TRUE; break; }
2065 sender_host_address = argv[i];
2066 host_checking = checking = log_testing_mode = TRUE;
2067 host_checking_callout = argrest[1] == 'c';
2068 message_logs = FALSE;
2071 /* -bi: This option is used by sendmail to initialize *the* alias file,
2072 though it has the -oA option to specify a different file. Exim has no
2073 concept of *the* alias file, but since Sun's YP make script calls
2074 sendmail this way, some support must be provided. */
2076 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2078 /* -bI: provide information, of the type to follow after a colon.
2079 This is an Exim flag. */
2081 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2083 uschar *p = &argrest[2];
2084 info_flag = CMDINFO_HELP;
2087 if (strcmpic(p, CUS"sieve") == 0)
2089 info_flag = CMDINFO_SIEVE;
2092 else if (strcmpic(p, CUS"dscp") == 0)
2094 info_flag = CMDINFO_DSCP;
2097 else if (strcmpic(p, CUS"help") == 0)
2104 /* -bm: Accept and deliver message - the default option. Reinstate
2105 receiving_message, which got turned off for all -b options. */
2107 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2109 /* -bmalware: test the filename given for malware */
2111 else if (Ustrcmp(argrest, "malware") == 0)
2113 if (++i >= argc) { badarg = TRUE; break; }
2115 malware_test_file = argv[i];
2118 /* -bnq: For locally originating messages, do not qualify unqualified
2119 addresses. In the envelope, this causes errors; in header lines they
2122 else if (Ustrcmp(argrest, "nq") == 0)
2124 allow_unqualified_sender = FALSE;
2125 allow_unqualified_recipient = FALSE;
2128 /* -bpxx: List the contents of the mail queue, in various forms. If
2129 the option is -bpc, just a queue count is needed. Otherwise, if the
2130 first letter after p is r, then order is random. */
2132 else if (*argrest == 'p')
2134 if (*(++argrest) == 'c')
2137 if (*(++argrest) != 0) badarg = TRUE;
2141 if (*argrest == 'r')
2143 list_queue_option = 8;
2146 else list_queue_option = 0;
2150 /* -bp: List the contents of the mail queue, top-level only */
2152 if (*argrest == 0) {}
2154 /* -bpu: List the contents of the mail queue, top-level undelivered */
2156 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2158 /* -bpa: List the contents of the mail queue, including all delivered */
2160 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2162 /* Unknown after -bp[r] */
2172 /* -bP: List the configuration variables given as the address list.
2173 Force -v, so configuration errors get displayed. */
2175 else if (Ustrcmp(argrest, "P") == 0)
2177 /* -bP config: we need to setup here, because later,
2178 * when list_options is checked, the config is read already */
2179 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2182 readconf_save_config(version_string);
2186 list_options = TRUE;
2187 debug_selector |= D_v;
2188 debug_file = stderr;
2192 /* -brt: Test retry configuration lookup */
2194 else if (Ustrcmp(argrest, "rt") == 0)
2197 test_retry_arg = i + 1;
2201 /* -brw: Test rewrite configuration */
2203 else if (Ustrcmp(argrest, "rw") == 0)
2206 test_rewrite_arg = i + 1;
2210 /* -bS: Read SMTP commands on standard input, but produce no replies -
2211 all errors are reported by sending messages. */
2213 else if (Ustrcmp(argrest, "S") == 0)
2214 smtp_input = smtp_batched_input = receiving_message = TRUE;
2216 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2217 on standard output. */
2219 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2221 /* -bt: address testing mode */
2223 else if (Ustrcmp(argrest, "t") == 0)
2224 address_test_mode = checking = log_testing_mode = TRUE;
2226 /* -bv: verify addresses */
2228 else if (Ustrcmp(argrest, "v") == 0)
2229 verify_address_mode = checking = log_testing_mode = TRUE;
2231 /* -bvs: verify sender addresses */
2233 else if (Ustrcmp(argrest, "vs") == 0)
2235 verify_address_mode = checking = log_testing_mode = TRUE;
2236 verify_as_sender = TRUE;
2239 /* -bV: Print version string and support details */
2241 else if (Ustrcmp(argrest, "V") == 0)
2243 printf("Exim version %s #%s built %s\n", version_string,
2244 version_cnumber, version_date);
2245 printf("%s\n", CS version_copyright);
2246 version_printed = TRUE;
2247 show_whats_supported(stdout);
2248 log_testing_mode = TRUE;
2251 /* -bw: inetd wait mode, accept a listening socket as stdin */
2253 else if (*argrest == 'w')
2255 inetd_wait_mode = TRUE;
2256 background_daemon = FALSE;
2257 daemon_listen = TRUE;
2258 if (*(++argrest) != '\0')
2260 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2261 if (inetd_wait_timeout <= 0)
2263 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2273 /* -C: change configuration file list; ignore if it isn't really
2274 a change! Enforce a prefix check if required. */
2279 if(++i < argc) argrest = argv[i]; else
2280 { badarg = TRUE; break; }
2282 if (Ustrcmp(config_main_filelist, argrest) != 0)
2284 #ifdef ALT_CONFIG_PREFIX
2286 int len = Ustrlen(ALT_CONFIG_PREFIX);
2287 uschar *list = argrest;
2289 while((filename = string_nextinlist(&list, &sep, big_buffer,
2290 big_buffer_size)) != NULL)
2292 if ((Ustrlen(filename) < len ||
2293 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2294 Ustrstr(filename, "/../") != NULL) &&
2295 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2297 fprintf(stderr, "-C Permission denied\n");
2302 if (real_uid != root_uid)
2304 #ifdef TRUSTED_CONFIG_LIST
2306 if (real_uid != exim_uid
2307 #ifdef CONFIGURE_OWNER
2308 && real_uid != config_uid
2311 trusted_config = FALSE;
2314 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2317 struct stat statbuf;
2319 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2320 (statbuf.st_uid != root_uid /* owner not root */
2321 #ifdef CONFIGURE_OWNER
2322 && statbuf.st_uid != config_uid /* owner not the special one */
2325 (statbuf.st_gid != root_gid /* group not root */
2326 #ifdef CONFIGURE_GROUP
2327 && statbuf.st_gid != config_gid /* group not the special one */
2329 && (statbuf.st_mode & 020) != 0 /* group writeable */
2331 (statbuf.st_mode & 2) != 0) /* world writeable */
2333 trusted_config = FALSE;
2338 /* Well, the trust list at least is up to scratch... */
2339 void *reset_point = store_get(0);
2340 uschar *trusted_configs[32];
2344 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2346 uschar *start = big_buffer, *nl;
2347 while (*start && isspace(*start))
2351 nl = Ustrchr(start, '\n');
2354 trusted_configs[nr_configs++] = string_copy(start);
2355 if (nr_configs == 32)
2363 const uschar *list = argrest;
2365 while (trusted_config && (filename = string_nextinlist(&list,
2366 &sep, big_buffer, big_buffer_size)) != NULL)
2368 for (i=0; i < nr_configs; i++)
2370 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2373 if (i == nr_configs)
2375 trusted_config = FALSE;
2379 store_reset(reset_point);
2383 /* No valid prefixes found in trust_list file. */
2384 trusted_config = FALSE;
2390 /* Could not open trust_list file. */
2391 trusted_config = FALSE;
2395 /* Not root; don't trust config */
2396 trusted_config = FALSE;
2400 config_main_filelist = argrest;
2401 config_changed = TRUE;
2406 /* -D: set up a macro definition */
2409 #ifdef DISABLE_D_OPTION
2410 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2415 macro_item *mlast = NULL;
2418 uschar *s = argrest;
2420 while (isspace(*s)) s++;
2422 if (*s < 'A' || *s > 'Z')
2424 fprintf(stderr, "exim: macro name set by -D must start with "
2425 "an upper case letter\n");
2429 while (isalnum(*s) || *s == '_')
2431 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2435 if (ptr == 0) { badarg = TRUE; break; }
2436 while (isspace(*s)) s++;
2439 if (*s++ != '=') { badarg = TRUE; break; }
2440 while (isspace(*s)) s++;
2443 for (m = macros; m != NULL; m = m->next)
2445 if (Ustrcmp(m->name, name) == 0)
2447 fprintf(stderr, "exim: duplicated -D in command line\n");
2453 m = store_get(sizeof(macro_item) + Ustrlen(name));
2455 m->command_line = TRUE;
2456 if (mlast == NULL) macros = m; else mlast->next = m;
2457 Ustrcpy(m->name, name);
2458 m->replacement = string_copy(s);
2460 if (clmacro_count >= MAX_CLMACROS)
2462 fprintf(stderr, "exim: too many -D options on command line\n");
2465 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2471 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2472 The latter is now a no-op, retained for compatibility only. If -dd is used,
2473 debugging subprocesses of the daemon is disabled. */
2476 if (Ustrcmp(argrest, "ropcr") == 0)
2478 /* drop_cr = TRUE; */
2481 /* Use an intermediate variable so that we don't set debugging while
2482 decoding the debugging bits. */
2486 unsigned int selector = D_default;
2489 if (*argrest == 'd')
2491 debug_daemon = TRUE;
2495 decode_bits(&selector, 1, debug_notall, argrest,
2496 debug_options, debug_options_count, US"debug", 0);
2497 debug_selector = selector;
2502 /* -E: This is a local error message. This option is not intended for
2503 external use at all, but is not restricted to trusted callers because it
2504 does no harm (just suppresses certain error messages) and if Exim is run
2505 not setuid root it won't always be trusted when it generates error
2506 messages using this option. If there is a message id following -E, point
2507 message_reference at it, for logging. */
2510 local_error_message = TRUE;
2511 if (mac_ismsgid(argrest)) message_reference = argrest;
2515 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2516 option, so it looks as if historically the -oex options are also callable
2517 without the leading -o. So we have to accept them. Before the switch,
2518 anything starting -oe has been converted to -e. Exim does not support all
2519 of the sendmail error options. */
2522 if (Ustrcmp(argrest, "e") == 0)
2524 arg_error_handling = ERRORS_SENDER;
2525 errors_sender_rc = EXIT_SUCCESS;
2527 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2528 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2529 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2530 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2535 /* -F: Set sender's full name, used instead of the gecos entry from
2536 the password file. Since users can usually alter their gecos entries,
2537 there's no security involved in using this instead. The data can follow
2538 the -F or be in the next argument. */
2543 if(++i < argc) argrest = argv[i]; else
2544 { badarg = TRUE; break; }
2546 originator_name = argrest;
2547 sender_name_forced = TRUE;
2551 /* -f: Set sender's address - this value is only actually used if Exim is
2552 run by a trusted user, or if untrusted_set_sender is set and matches the
2553 address, except that the null address can always be set by any user. The
2554 test for this happens later, when the value given here is ignored when not
2555 permitted. For an untrusted user, the actual sender is still put in Sender:
2556 if it doesn't match the From: header (unless no_local_from_check is set).
2557 The data can follow the -f or be in the next argument. The -r switch is an
2558 obsolete form of -f but since there appear to be programs out there that
2559 use anything that sendmail has ever supported, better accept it - the
2560 synonymizing is done before the switch above.
2562 At this stage, we must allow domain literal addresses, because we don't
2563 know what the setting of allow_domain_literals is yet. Ditto for trailing
2564 dots and strip_trailing_dot. */
2568 int dummy_start, dummy_end;
2572 if (i+1 < argc) argrest = argv[++i]; else
2573 { badarg = TRUE; break; }
2576 sender_address = string_sprintf(""); /* Ensure writeable memory */
2579 uschar *temp = argrest + Ustrlen(argrest) - 1;
2580 while (temp >= argrest && isspace(*temp)) temp--;
2581 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2582 allow_domain_literals = TRUE;
2583 strip_trailing_dot = TRUE;
2585 allow_utf8_domains = TRUE;
2587 sender_address = parse_extract_address(argrest, &errmess,
2588 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2590 message_smtputf8 = string_is_utf8(sender_address);
2591 allow_utf8_domains = FALSE;
2593 allow_domain_literals = FALSE;
2594 strip_trailing_dot = FALSE;
2595 if (sender_address == NULL)
2597 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2598 return EXIT_FAILURE;
2601 sender_address_forced = TRUE;
2605 /* -G: sendmail invocation to specify that it's a gateway submission and
2606 sendmail may complain about problems instead of fixing them.
2607 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2608 not at this time complain about problems. */
2614 /* -h: Set the hop count for an incoming message. Exim does not currently
2615 support this; it always computes it by counting the Received: headers.
2616 To put it in will require a change to the spool header file format. */
2621 if(++i < argc) argrest = argv[i]; else
2622 { badarg = TRUE; break; }
2624 if (!isdigit(*argrest)) badarg = TRUE;
2628 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2629 not to be documented for sendmail but mailx (at least) uses it) */
2632 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2636 /* -L: set the identifier used for syslog; equivalent to setting
2637 syslog_processname in the config file, but needs to be an admin option. */
2640 if (*argrest == '\0')
2642 if(++i < argc) argrest = argv[i]; else
2643 { badarg = TRUE; break; }
2645 sz = Ustrlen(argrest);
2648 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2649 return EXIT_FAILURE;
2653 fprintf(stderr, "exim: the -L syslog name is too short\n");
2654 return EXIT_FAILURE;
2656 cmdline_syslog_name = argrest;
2660 receiving_message = FALSE;
2662 /* -MC: continue delivery of another message via an existing open
2663 file descriptor. This option is used for an internal call by the
2664 smtp transport when there is a pending message waiting to go to an
2665 address to which it has got a connection. Five subsequent arguments are
2666 required: transport name, host name, IP address, sequence number, and
2667 message_id. Transports may decline to create new processes if the sequence
2668 number gets too big. The channel is stdin. This (-MC) must be the last
2669 argument. There's a subsequent check that the real-uid is privileged.
2671 If we are running in the test harness. delay for a bit, to let the process
2672 that set this one up complete. This makes for repeatability of the logging,
2675 if (Ustrcmp(argrest, "C") == 0)
2677 union sockaddr_46 interface_sock;
2678 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2682 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2683 return EXIT_FAILURE;
2686 if (msg_action_arg >= 0)
2688 fprintf(stderr, "exim: incompatible arguments\n");
2689 return EXIT_FAILURE;
2692 continue_transport = argv[++i];
2693 continue_hostname = argv[++i];
2694 continue_host_address = argv[++i];
2695 continue_sequence = Uatoi(argv[++i]);
2696 msg_action = MSG_DELIVER;
2697 msg_action_arg = ++i;
2698 forced_delivery = TRUE;
2699 queue_run_pid = passed_qr_pid;
2700 queue_run_pipe = passed_qr_pipe;
2702 if (!mac_ismsgid(argv[i]))
2704 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2706 return EXIT_FAILURE;
2709 /* Set up $sending_ip_address and $sending_port */
2711 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2713 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2717 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2719 return EXIT_FAILURE;
2722 if (running_in_test_harness) millisleep(500);
2726 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2730 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2731 precedes -MC (see above). The flag indicates that the host to which
2732 Exim is connected has accepted an AUTH sequence. */
2734 case 'A': smtp_authenticated = TRUE; break;
2736 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2737 that exim is connected to supports the esmtp extension DSN */
2739 case 'D': smtp_peer_options |= PEER_OFFERED_DSN; break;
2741 /* -MCG: set the queue name, to a non-default value */
2743 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2747 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2749 case 'K': smtp_peer_options |= PEER_OFFERED_CHUNKING; break;
2751 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2752 it preceded -MC (see above) */
2754 case 'P': smtp_peer_options |= PEER_OFFERED_PIPE; break;
2756 /* -MCQ: pass on the pid of the queue-running process that started
2757 this chain of deliveries and the fd of its synchronizing pipe; this
2758 is useful only when it precedes -MC (see above) */
2760 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2762 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2766 /* -MCS: set the smtp_use_size flag; this is useful only when it
2767 precedes -MC (see above) */
2769 case 'S': smtp_peer_options |= PEER_OFFERED_SIZE; break;
2772 /* -MCT: set the tls_offered flag; this is useful only when it
2773 precedes -MC (see above). The flag indicates that the host to which
2774 Exim is connected has offered TLS support. */
2776 case 'T': smtp_peer_options |= PEER_OFFERED_TLS; break;
2779 default: badarg = TRUE; break;
2784 /* -M[x]: various operations on the following list of message ids:
2785 -M deliver the messages, ignoring next retry times and thawing
2786 -Mc deliver the messages, checking next retry times, no thawing
2787 -Mf freeze the messages
2788 -Mg give up on the messages
2789 -Mt thaw the messages
2790 -Mrm remove the messages
2791 In the above cases, this must be the last option. There are also the
2792 following options which are followed by a single message id, and which
2793 act on that message. Some of them use the "recipient" addresses as well.
2794 -Mar add recipient(s)
2795 -Mmad mark all recipients delivered
2796 -Mmd mark recipients(s) delivered
2798 -Mset load a message for use with -be
2800 -Mvc show copy (of whole message, in RFC 2822 format)
2805 else if (*argrest == 0)
2807 msg_action = MSG_DELIVER;
2808 forced_delivery = deliver_force_thaw = TRUE;
2810 else if (Ustrcmp(argrest, "ar") == 0)
2812 msg_action = MSG_ADD_RECIPIENT;
2813 one_msg_action = TRUE;
2815 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2816 else if (Ustrcmp(argrest, "es") == 0)
2818 msg_action = MSG_EDIT_SENDER;
2819 one_msg_action = TRUE;
2821 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2822 else if (Ustrcmp(argrest, "g") == 0)
2824 msg_action = MSG_DELIVER;
2825 deliver_give_up = TRUE;
2827 else if (Ustrcmp(argrest, "mad") == 0)
2829 msg_action = MSG_MARK_ALL_DELIVERED;
2831 else if (Ustrcmp(argrest, "md") == 0)
2833 msg_action = MSG_MARK_DELIVERED;
2834 one_msg_action = TRUE;
2836 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2837 else if (Ustrcmp(argrest, "set") == 0)
2839 msg_action = MSG_LOAD;
2840 one_msg_action = TRUE;
2842 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2843 else if (Ustrcmp(argrest, "vb") == 0)
2845 msg_action = MSG_SHOW_BODY;
2846 one_msg_action = TRUE;
2848 else if (Ustrcmp(argrest, "vc") == 0)
2850 msg_action = MSG_SHOW_COPY;
2851 one_msg_action = TRUE;
2853 else if (Ustrcmp(argrest, "vh") == 0)
2855 msg_action = MSG_SHOW_HEADER;
2856 one_msg_action = TRUE;
2858 else if (Ustrcmp(argrest, "vl") == 0)
2860 msg_action = MSG_SHOW_LOG;
2861 one_msg_action = TRUE;
2863 else { badarg = TRUE; break; }
2865 /* All the -Mxx options require at least one message id. */
2867 msg_action_arg = i + 1;
2868 if (msg_action_arg >= argc)
2870 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2871 return EXIT_FAILURE;
2874 /* Some require only message ids to follow */
2876 if (!one_msg_action)
2879 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2881 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2883 return EXIT_FAILURE;
2885 goto END_ARG; /* Remaining args are ids */
2888 /* Others require only one message id, possibly followed by addresses,
2889 which will be handled as normal arguments. */
2893 if (!mac_ismsgid(argv[msg_action_arg]))
2895 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2896 argv[msg_action_arg], arg);
2897 return EXIT_FAILURE;
2904 /* Some programs seem to call the -om option without the leading o;
2905 for sendmail it askes for "me too". Exim always does this. */
2908 if (*argrest != 0) badarg = TRUE;
2912 /* -N: don't do delivery - a debugging option that stops transports doing
2913 their thing. It implies debugging at the D_v level. */
2918 dont_deliver = TRUE;
2919 debug_selector |= D_v;
2920 debug_file = stderr;
2926 /* -n: This means "don't alias" in sendmail, apparently.
2927 For normal invocations, it has no effect.
2928 It may affect some other options. */
2934 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2935 option to the specified value. This form uses long names. We need to handle
2936 -O option=value and -Ooption=value. */
2943 fprintf(stderr, "exim: string expected after -O\n");
2951 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2954 if (*argrest == 'A')
2956 alias_arg = argrest + 1;
2957 if (alias_arg[0] == 0)
2959 if (i+1 < argc) alias_arg = argv[++i]; else
2961 fprintf(stderr, "exim: string expected after -oA\n");
2967 /* -oB: Set a connection message max value for remote deliveries */
2969 else if (*argrest == 'B')
2971 uschar *p = argrest + 1;
2974 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2976 connection_max_messages = 1;
2985 fprintf(stderr, "exim: number expected after -oB\n");
2988 connection_max_messages = Uatoi(p);
2992 /* -odb: background delivery */
2994 else if (Ustrcmp(argrest, "db") == 0)
2996 synchronous_delivery = FALSE;
2997 arg_queue_only = FALSE;
2998 queue_only_set = TRUE;
3001 /* -odf: foreground delivery (smail-compatible option); same effect as
3002 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3005 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3007 synchronous_delivery = TRUE;
3008 arg_queue_only = FALSE;
3009 queue_only_set = TRUE;
3012 /* -odq: queue only */
3014 else if (Ustrcmp(argrest, "dq") == 0)
3016 synchronous_delivery = FALSE;
3017 arg_queue_only = TRUE;
3018 queue_only_set = TRUE;
3021 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3022 but no remote delivery */
3024 else if (Ustrcmp(argrest, "dqs") == 0)
3027 arg_queue_only = FALSE;
3028 queue_only_set = TRUE;
3031 /* -oex: Sendmail error flags. As these are also accepted without the
3032 leading -o prefix, for compatibility with vacation and other callers,
3033 they are handled with -e above. */
3035 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3036 -oitrue: Another sendmail syntax for the same */
3038 else if (Ustrcmp(argrest, "i") == 0 ||
3039 Ustrcmp(argrest, "itrue") == 0)
3042 /* -oM*: Set various characteristics for an incoming message; actually
3043 acted on for trusted callers only. */
3045 else if (*argrest == 'M')
3049 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3053 /* -oMa: Set sender host address */
3055 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3057 /* -oMaa: Set authenticator name */
3059 else if (Ustrcmp(argrest, "Maa") == 0)
3060 sender_host_authenticated = argv[++i];
3062 /* -oMas: setting authenticated sender */
3064 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3066 /* -oMai: setting authenticated id */
3068 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3070 /* -oMi: Set incoming interface address */
3072 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3074 /* -oMm: Message reference */
3076 else if (Ustrcmp(argrest, "Mm") == 0)
3078 if (!mac_ismsgid(argv[i+1]))
3080 fprintf(stderr,"-oMm must be a valid message ID\n");
3083 if (!trusted_config)
3085 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3088 message_reference = argv[++i];
3091 /* -oMr: Received protocol */
3093 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3095 /* -oMs: Set sender host name */
3097 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3099 /* -oMt: Set sender ident */
3101 else if (Ustrcmp(argrest, "Mt") == 0)
3103 sender_ident_set = TRUE;
3104 sender_ident = argv[++i];
3107 /* Else a bad argument */
3116 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3117 seem to call this as -m (undocumented), so that is also accepted (see
3120 else if (Ustrcmp(argrest, "m") == 0) {}
3122 /* -oo: An ancient flag for old-style addresses which still seems to
3123 crop up in some calls (see in SCO). */
3125 else if (Ustrcmp(argrest, "o") == 0) {}
3127 /* -oP <name>: set pid file path for daemon */
3129 else if (Ustrcmp(argrest, "P") == 0)
3130 override_pid_file_path = argv[++i];
3132 /* -or <n>: set timeout for non-SMTP acceptance
3133 -os <n>: set timeout for SMTP acceptance */
3135 else if (*argrest == 'r' || *argrest == 's')
3137 int *tp = (*argrest == 'r')?
3138 &arg_receive_timeout : &arg_smtp_receive_timeout;
3139 if (argrest[1] == 0)
3141 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3143 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3146 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3151 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3153 else if (Ustrcmp(argrest, "X") == 0)
3154 override_local_interfaces = argv[++i];
3156 /* Unknown -o argument */
3162 /* -ps: force Perl startup; -pd force delayed Perl startup */
3166 if (*argrest == 's' && argrest[1] == 0)
3168 perl_start_option = 1;
3171 if (*argrest == 'd' && argrest[1] == 0)
3173 perl_start_option = -1;
3178 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3179 which sets the host protocol and host name */
3183 if (i+1 < argc) argrest = argv[++i]; else
3184 { badarg = TRUE; break; }
3189 uschar *hn = Ustrchr(argrest, ':');
3192 received_protocol = argrest;
3196 received_protocol = string_copyn(argrest, hn - argrest);
3197 sender_host_name = hn + 1;
3204 receiving_message = FALSE;
3205 if (queue_interval >= 0)
3207 fprintf(stderr, "exim: -q specified more than once\n");
3211 /* -qq...: Do queue runs in a 2-stage manner */
3213 if (*argrest == 'q')
3215 queue_2stage = TRUE;
3219 /* -qi...: Do only first (initial) deliveries */
3221 if (*argrest == 'i')
3223 queue_run_first_delivery = TRUE;
3227 /* -qf...: Run the queue, forcing deliveries
3228 -qff..: Ditto, forcing thawing as well */
3230 if (*argrest == 'f')
3232 queue_run_force = TRUE;
3233 if (*++argrest == 'f')
3235 deliver_force_thaw = TRUE;
3240 /* -q[f][f]l...: Run the queue only on local deliveries */
3242 if (*argrest == 'l')
3244 queue_run_local = TRUE;
3248 /* -q[f][f][l][G<name>]... Work on the named queue */
3250 if (*argrest == 'G')
3253 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3254 queue_name = string_copyn(argrest, i);
3256 if (*argrest == '/') argrest++;
3259 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3260 only, optionally named, optionally starting from a given message id. */
3262 if (*argrest == 0 &&
3263 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3266 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3267 start_queue_run_id = argv[++i];
3268 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3269 stop_queue_run_id = argv[++i];
3272 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3273 forced, optionally local only, optionally named. */
3275 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3278 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3284 case 'R': /* Synonymous with -qR... */
3285 receiving_message = FALSE;
3287 /* -Rf: As -R (below) but force all deliveries,
3288 -Rff: Ditto, but also thaw all frozen messages,
3289 -Rr: String is regex
3290 -Rrf: Regex and force
3291 -Rrff: Regex and force and thaw
3293 in all cases provided there are no further characters in this
3299 for (i = 0; i < nelem(rsopts); i++)
3300 if (Ustrcmp(argrest, rsopts[i]) == 0)
3302 if (i != 2) queue_run_force = TRUE;
3303 if (i >= 2) deliver_selectstring_regex = TRUE;
3304 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3305 argrest += Ustrlen(rsopts[i]);
3309 /* -R: Set string to match in addresses for forced queue run to
3310 pick out particular messages. */
3313 deliver_selectstring = argrest;
3314 else if (i+1 < argc)
3315 deliver_selectstring = argv[++i];
3318 fprintf(stderr, "exim: string expected after -R\n");
3324 /* -r: an obsolete synonym for -f (see above) */
3327 /* -S: Like -R but works on sender. */
3329 case 'S': /* Synonymous with -qS... */
3330 receiving_message = FALSE;
3332 /* -Sf: As -S (below) but force all deliveries,
3333 -Sff: Ditto, but also thaw all frozen messages,
3334 -Sr: String is regex
3335 -Srf: Regex and force
3336 -Srff: Regex and force and thaw
3338 in all cases provided there are no further characters in this
3344 for (i = 0; i < nelem(rsopts); i++)
3345 if (Ustrcmp(argrest, rsopts[i]) == 0)
3347 if (i != 2) queue_run_force = TRUE;
3348 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3349 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3350 argrest += Ustrlen(rsopts[i]);
3354 /* -S: Set string to match in addresses for forced queue run to
3355 pick out particular messages. */
3358 deliver_selectstring_sender = argrest;
3359 else if (i+1 < argc)
3360 deliver_selectstring_sender = argv[++i];
3363 fprintf(stderr, "exim: string expected after -S\n");
3368 /* -Tqt is an option that is exclusively for use by the testing suite.
3369 It is not recognized in other circumstances. It allows for the setting up
3370 of explicit "queue times" so that various warning/retry things can be
3371 tested. Otherwise variability of clock ticks etc. cause problems. */
3374 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3375 fudged_queue_times = argv[++i];
3380 /* -t: Set flag to extract recipients from body of message. */
3383 if (*argrest == 0) extract_recipients = TRUE;
3385 /* -ti: Set flag to extract recipients from body of message, and also
3386 specify that dot does not end the message. */
3388 else if (Ustrcmp(argrest, "i") == 0)
3390 extract_recipients = TRUE;
3394 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3397 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3404 /* -U: This means "initial user submission" in sendmail, apparently. The
3405 doc claims that in future sendmail may refuse syntactically invalid
3406 messages instead of fixing them. For the moment, we just ignore it. */
3412 /* -v: verify things - this is a very low-level debugging */
3417 debug_selector |= D_v;
3418 debug_file = stderr;
3424 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3426 The -x flag tells the sendmail command that mail from a local
3427 mail program has National Language Support (NLS) extended characters
3428 in the body of the mail item. The sendmail command can send mail with
3429 extended NLS characters across networks that normally corrupts these
3432 As Exim is 8-bit clean, it just ignores this flag. */
3435 if (*argrest != 0) badarg = TRUE;
3438 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3439 logs to that file. We swallow the parameter and otherwise ignore it. */
3442 if (*argrest == '\0')
3445 fprintf(stderr, "exim: string expected after -X\n");
3451 if (*argrest == '\0')
3452 if (++i < argc) log_oneline = argv[i]; else
3454 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3459 /* All other initial characters are errors */
3464 } /* End of high-level switch statement */
3466 /* Failed to recognize the option, or syntax error */
3470 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3471 "option %s\n", arg);
3477 /* If -R or -S have been specified without -q, assume a single queue run. */
3479 if ( (deliver_selectstring || deliver_selectstring_sender)
3480 && queue_interval < 0)
3485 /* If usage_wanted is set we call the usage function - which never returns */
3486 if (usage_wanted) exim_usage(called_as);
3488 /* Arguments have been processed. Check for incompatibilities. */
3490 (smtp_input || extract_recipients || recipients_arg < argc) &&
3491 (daemon_listen || queue_interval >= 0 || bi_option ||
3492 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3493 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3496 msg_action_arg > 0 &&
3497 (daemon_listen || queue_interval > 0 || list_options ||
3498 (checking && msg_action != MSG_LOAD) ||
3499 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3502 (daemon_listen || queue_interval > 0) &&
3503 (sender_address != NULL || list_options || list_queue || checking ||
3507 daemon_listen && queue_interval == 0
3510 inetd_wait_mode && queue_interval >= 0
3514 (checking || smtp_input || extract_recipients ||
3515 filter_test != FTEST_NONE || bi_option)
3518 verify_address_mode &&
3519 (address_test_mode || smtp_input || extract_recipients ||
3520 filter_test != FTEST_NONE || bi_option)
3523 address_test_mode && (smtp_input || extract_recipients ||
3524 filter_test != FTEST_NONE || bi_option)
3527 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3531 deliver_selectstring != NULL && queue_interval < 0
3534 msg_action == MSG_LOAD &&
3535 (!expansion_test || expansion_test_message != NULL)
3539 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3543 /* If debugging is set up, set the file and the file descriptor to pass on to
3544 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3545 to run in the foreground. */
3547 if (debug_selector != 0)
3549 debug_file = stderr;
3550 debug_fd = fileno(debug_file);
3551 background_daemon = FALSE;
3552 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3553 if (debug_selector != D_v) /* -v only doesn't show this */
3555 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3556 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3558 if (!version_printed)
3559 show_whats_supported(stderr);
3563 /* When started with root privilege, ensure that the limits on the number of
3564 open files and the number of processes (where that is accessible) are
3565 sufficiently large, or are unset, in case Exim has been called from an
3566 environment where the limits are screwed down. Not all OS have the ability to
3567 change some of these limits. */
3571 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3577 #ifdef RLIMIT_NOFILE
3578 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3580 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3582 rlp.rlim_cur = rlp.rlim_max = 0;
3585 /* I originally chose 1000 as a nice big number that was unlikely to
3586 be exceeded. It turns out that some older OS have a fixed upper limit of
3589 if (rlp.rlim_cur < 1000)
3591 rlp.rlim_cur = rlp.rlim_max = 1000;
3592 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3594 rlp.rlim_cur = rlp.rlim_max = 256;
3595 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3596 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3603 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3605 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3607 rlp.rlim_cur = rlp.rlim_max = 0;
3610 #ifdef RLIM_INFINITY
3611 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3613 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3615 if (rlp.rlim_cur < 1000)
3617 rlp.rlim_cur = rlp.rlim_max = 1000;
3619 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3620 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3626 /* Exim is normally entered as root (but some special configurations are
3627 possible that don't do this). However, it always spins off sub-processes that
3628 set their uid and gid as required for local delivery. We don't want to pass on
3629 any extra groups that root may belong to, so we want to get rid of them all at
3632 We need to obey setgroups() at this stage, before possibly giving up root
3633 privilege for a changed configuration file, but later on we might need to
3634 check on the additional groups for the admin user privilege - can't do that
3635 till after reading the config, which might specify the exim gid. Therefore,
3636 save the group list here first. */
3638 group_count = getgroups(NGROUPS_MAX, group_list);
3639 if (group_count < 0)
3641 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3645 /* There is a fundamental difference in some BSD systems in the matter of
3646 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3647 known not to be different. On the "different" systems there is a single group
3648 list, and the first entry in it is the current group. On all other versions of
3649 Unix there is a supplementary group list, which is in *addition* to the current
3650 group. Consequently, to get rid of all extraneous groups on a "standard" system
3651 you pass over 0 groups to setgroups(), while on a "different" system you pass
3652 over a single group - the current group, which is always the first group in the
3653 list. Calling setgroups() with zero groups on a "different" system results in
3654 an error return. The following code should cope with both types of system.
3656 However, if this process isn't running as root, setgroups() can't be used
3657 since you have to be root to run it, even if throwing away groups. Not being
3658 root here happens only in some unusual configurations. We just ignore the
3661 if (setgroups(0, NULL) != 0)
3663 if (setgroups(1, group_list) != 0 && !unprivileged)
3665 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3670 /* If the configuration file name has been altered by an argument on the
3671 command line (either a new file name or a macro definition) and the caller is
3672 not root, or if this is a filter testing run, remove any setuid privilege the
3673 program has and run as the underlying user.
3675 The exim user is locked out of this, which severely restricts the use of -C
3678 Otherwise, set the real ids to the effective values (should be root unless run
3679 from inetd, which it can either be root or the exim uid, if one is configured).
3681 There is a private mechanism for bypassing some of this, in order to make it
3682 possible to test lots of configurations automatically, without having either to
3683 recompile each time, or to patch in an actual configuration file name and other
3684 values (such as the path name). If running in the test harness, pretend that
3685 configuration file changes and macro definitions haven't happened. */
3688 (!trusted_config || /* Config changed, or */
3689 !macros_trusted()) && /* impermissible macros and */
3690 real_uid != root_uid && /* Not root, and */
3691 !running_in_test_harness /* Not fudged */
3693 expansion_test /* expansion testing */
3695 filter_test != FTEST_NONE) /* Filter testing */
3697 setgroups(group_count, group_list);
3698 exim_setugid(real_uid, real_gid, FALSE,
3699 US"-C, -D, -be or -bf forces real uid");
3700 removed_privilege = TRUE;
3702 /* In the normal case when Exim is called like this, stderr is available
3703 and should be used for any logging information because attempts to write
3704 to the log will usually fail. To arrange this, we unset really_exim. However,
3705 if no stderr is available there is no point - we might as well have a go
3706 at the log (if it fails, syslog will be written).
3708 Note that if the invoker is Exim, the logs remain available. Messing with
3709 this causes unlogged successful deliveries. */
3711 if ((log_stderr != NULL) && (real_uid != exim_uid))
3712 really_exim = FALSE;
3715 /* Privilege is to be retained for the moment. It may be dropped later,
3716 depending on the job that this Exim process has been asked to do. For now, set
3717 the real uid to the effective so that subsequent re-execs of Exim are done by a
3720 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3722 /* If testing a filter, open the file(s) now, before wasting time doing other
3723 setups and reading the message. */
3725 if ((filter_test & FTEST_SYSTEM) != 0)
3727 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3730 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3732 return EXIT_FAILURE;
3736 if ((filter_test & FTEST_USER) != 0)
3738 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3741 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3743 return EXIT_FAILURE;
3747 /* Initialise lookup_list
3748 If debugging, already called above via version reporting.
3749 In either case, we initialise the list of available lookups while running
3750 as root. All dynamically modules are loaded from a directory which is
3751 hard-coded into the binary and is code which, if not a module, would be
3752 part of Exim already. Ability to modify the content of the directory
3753 is equivalent to the ability to modify a setuid binary!
3755 This needs to happen before we read the main configuration. */
3759 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3762 /* Read the main runtime configuration data; this gives up if there
3763 is a failure. It leaves the configuration file open so that the subsequent
3764 configuration data for delivery can be read if needed.
3766 NOTE: immediatly after opening the configuration file we change the working
3767 directory to "/"! Later we change to $spool_directory. We do it there, because
3768 during readconf_main() some expansion takes place already. */
3770 /* Store the initial cwd before we change directories */
3771 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3773 perror("exim: can't get the current working directory");
3778 -be[m] expansion test -
3779 -b[fF] filter test new
3781 -bmalware malware_test_file new
3783 -brw rewrite test new
3785 -bv[s] address verify -
3787 -bP <option> (except -bP config, which sets list_config)
3789 If any of these options is set, we suppress warnings about configuration
3790 issues (currently about tls_advertise_hosts and keep_environment not being
3793 readconf_main(checking || list_options);
3795 /* Now in directory "/" */
3797 if (cleanup_environment() == FALSE)
3798 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3801 /* If an action on specific messages is requested, or if a daemon or queue
3802 runner is being started, we need to know if Exim was called by an admin user.
3803 This is the case if the real user is root or exim, or if the real group is
3804 exim, or if one of the supplementary groups is exim or a group listed in
3805 admin_groups. We don't fail all message actions immediately if not admin_user,
3806 since some actions can be performed by non-admin users. Instead, set admin_user
3807 for later interrogation. */
3809 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3814 for (i = 0; i < group_count; i++)
3816 if (group_list[i] == exim_gid) admin_user = TRUE;
3817 else if (admin_groups != NULL)
3819 for (j = 1; j <= (int)(admin_groups[0]); j++)
3820 if (admin_groups[j] == group_list[i])
3821 { admin_user = TRUE; break; }
3823 if (admin_user) break;
3827 /* Another group of privileged users are the trusted users. These are root,
3828 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3829 are permitted to specify sender_addresses with -f on the command line, and
3830 other message parameters as well. */
3832 if (real_uid == root_uid || real_uid == exim_uid)
3833 trusted_caller = TRUE;
3838 if (trusted_users != NULL)
3840 for (i = 1; i <= (int)(trusted_users[0]); i++)
3841 if (trusted_users[i] == real_uid)
3842 { trusted_caller = TRUE; break; }
3845 if (!trusted_caller && trusted_groups != NULL)
3847 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3849 if (trusted_groups[i] == real_gid)
3850 trusted_caller = TRUE;
3851 else for (j = 0; j < group_count; j++)
3853 if (trusted_groups[i] == group_list[j])
3854 { trusted_caller = TRUE; break; }
3856 if (trusted_caller) break;
3861 /* Handle the decoding of logging options. */
3863 decode_bits(log_selector, log_selector_size, log_notall,
3864 log_selector_string, log_options, log_options_count, US"log", 0);
3869 debug_printf("configuration file is %s\n", config_main_filename);
3870 debug_printf("log selectors =");
3871 for (i = 0; i < log_selector_size; i++)
3872 debug_printf(" %08x", log_selector[i]);
3876 /* If domain literals are not allowed, check the sender address that was
3877 supplied with -f. Ditto for a stripped trailing dot. */
3879 if (sender_address != NULL)
3881 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3883 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3884 "allowed\n", sender_address);
3885 return EXIT_FAILURE;
3887 if (f_end_dot && !strip_trailing_dot)
3889 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3890 "(trailing dot not allowed)\n", sender_address);
3891 return EXIT_FAILURE;
3895 /* See if an admin user overrode our logging. */
3897 if (cmdline_syslog_name != NULL)
3901 syslog_processname = cmdline_syslog_name;
3902 log_file_path = string_copy(CUS"syslog");
3906 /* not a panic, non-privileged users should not be able to spam paniclog */
3908 "exim: you lack sufficient privilege to specify syslog process name\n");
3909 return EXIT_FAILURE;
3913 /* Paranoia check of maximum lengths of certain strings. There is a check
3914 on the length of the log file path in log.c, which will come into effect
3915 if there are any calls to write the log earlier than this. However, if we
3916 get this far but the string is very long, it is better to stop now than to
3917 carry on and (e.g.) receive a message and then have to collapse. The call to
3918 log_write() from here will cause the ultimate panic collapse if the complete
3919 file name exceeds the buffer length. */
3921 if (Ustrlen(log_file_path) > 200)
3922 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3923 "log_file_path is longer than 200 chars: aborting");
3925 if (Ustrlen(pid_file_path) > 200)
3926 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3927 "pid_file_path is longer than 200 chars: aborting");
3929 if (Ustrlen(spool_directory) > 200)
3930 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3931 "spool_directory is longer than 200 chars: aborting");
3933 /* Length check on the process name given to syslog for its TAG field,
3934 which is only permitted to be 32 characters or less. See RFC 3164. */
3936 if (Ustrlen(syslog_processname) > 32)
3937 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3938 "syslog_processname is longer than 32 chars: aborting");
3944 log_write(0, LOG_MAIN, "%s", log_oneline);
3945 return EXIT_SUCCESS;
3948 return EXIT_FAILURE;
3951 /* In some operating systems, the environment variable TMPDIR controls where
3952 temporary files are created; Exim doesn't use these (apart from when delivering
3953 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3954 If TMPDIR is found in the environment, reset it to the value defined in the
3955 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3956 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3957 EXIM_TMPDIR by the build scripts.
3963 if (environ) for (p = USS environ; *p != NULL; p++)
3965 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3966 Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3968 uschar *newp = malloc(Ustrlen(EXIM_TMPDIR) + 8);
3969 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3971 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3977 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3978 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3979 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3980 called by a user who has set the TZ variable. This then affects the timestamps
3981 in log files and in Received: headers, and any created Date: header lines. The
3982 required timezone is settable in the configuration file, so nothing can be done
3983 about this earlier - but hopefully nothing will normally be logged earlier than
3984 this. We have to make a new environment if TZ is wrong, but don't bother if
3985 timestamps_utc is set, because then all times are in UTC anyway. */
3987 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3989 timestamps_utc = TRUE;
3993 uschar *envtz = US getenv("TZ");
3994 if ((envtz == NULL && timezone_string != NULL) ||
3996 (timezone_string == NULL ||
3997 Ustrcmp(timezone_string, envtz) != 0)))
3999 uschar **p = USS environ;
4003 if (environ) while (*p++ != NULL) count++;
4004 if (envtz == NULL) count++;
4005 newp = new = malloc(sizeof(uschar *) * (count + 1));
4006 if (environ) for (p = USS environ; *p != NULL; p++)
4008 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
4011 if (timezone_string != NULL)
4013 *newp = malloc(Ustrlen(timezone_string) + 4);
4014 sprintf(CS *newp++, "TZ=%s", timezone_string);
4019 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4020 tod_stamp(tod_log));
4024 /* Handle the case when we have removed the setuid privilege because of -C or
4025 -D. This means that the caller of Exim was not root.
4027 There is a problem if we were running as the Exim user. The sysadmin may
4028 expect this case to retain privilege because "the binary was called by the
4029 Exim user", but it hasn't, because either the -D option set macros, or the
4030 -C option set a non-trusted configuration file. There are two possibilities:
4032 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4033 to do message deliveries. Thus, the fact that it is running as a
4034 non-privileged user is plausible, and might be wanted in some special
4035 configurations. However, really_exim will have been set false when
4036 privilege was dropped, to stop Exim trying to write to its normal log
4037 files. Therefore, re-enable normal log processing, assuming the sysadmin
4038 has set up the log directory correctly.
4040 (2) If deliver_drop_privilege is not set, the configuration won't work as
4041 apparently intended, and so we log a panic message. In order to retain
4042 root for -C or -D, the caller must either be root or be invoking a
4043 trusted configuration file (when deliver_drop_privilege is false). */
4045 if (removed_privilege && (!trusted_config || macros != NULL) &&
4046 real_uid == exim_uid)
4048 if (deliver_drop_privilege)
4049 really_exim = TRUE; /* let logging work normally */
4051 log_write(0, LOG_MAIN|LOG_PANIC,
4052 "exim user lost privilege for using %s option",
4053 trusted_config? "-D" : "-C");
4056 /* Start up Perl interpreter if Perl support is configured and there is a
4057 perl_startup option, and the configuration or the command line specifies
4058 initializing starting. Note that the global variables are actually called
4059 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4062 if (perl_start_option != 0)
4063 opt_perl_at_start = (perl_start_option > 0);
4064 if (opt_perl_at_start && opt_perl_startup != NULL)
4067 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4068 errstr = init_perl(opt_perl_startup);
4071 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4072 return EXIT_FAILURE;
4074 opt_perl_started = TRUE;
4076 #endif /* EXIM_PERL */
4078 /* Log the arguments of the call if the configuration file said so. This is
4079 a debugging feature for finding out what arguments certain MUAs actually use.
4080 Don't attempt it if logging is disabled, or if listing variables or if
4081 verifying/testing addresses or expansions. */
4083 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4084 && really_exim && !list_options && !checking)
4087 uschar *p = big_buffer;
4088 Ustrcpy(p, "cwd= (failed)");
4090 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4093 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4095 for (i = 0; i < argc; i++)
4097 int len = Ustrlen(argv[i]);
4098 const uschar *printing;
4100 if (p + len + 8 >= big_buffer + big_buffer_size)
4103 log_write(0, LOG_MAIN, "%s", big_buffer);
4104 Ustrcpy(big_buffer, "...");
4107 printing = string_printing(argv[i]);
4108 if (printing[0] == 0) quote = US"\""; else
4110 const uschar *pp = printing;
4112 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4114 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4115 (p - big_buffer) - 4), printing, quote);
4119 if (LOGGING(arguments))
4120 log_write(0, LOG_MAIN, "%s", big_buffer);
4122 debug_printf("%s\n", big_buffer);
4125 /* Set the working directory to be the top-level spool directory. We don't rely
4126 on this in the code, which always uses fully qualified names, but it's useful
4127 for core dumps etc. Don't complain if it fails - the spool directory might not
4128 be generally accessible and calls with the -C option (and others) have lost
4129 privilege by now. Before the chdir, we try to ensure that the directory exists.
4132 if (Uchdir(spool_directory) != 0)
4135 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4136 dummy = /* quieten compiler */ Uchdir(spool_directory);
4139 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4140 alias file. Exim doesn't have such a concept, but this call is screwed into
4141 Sun's YP makefiles. Handle this by calling a configured script, as the real
4142 user who called Exim. The -oA option can be used to pass an argument to the
4147 (void)fclose(config_file);
4148 if (bi_command != NULL)
4152 argv[i++] = bi_command;
4153 if (alias_arg != NULL) argv[i++] = alias_arg;
4156 setgroups(group_count, group_list);
4157 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4159 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4160 (argv[1] == NULL)? US"" : argv[1]);
4162 execv(CS argv[0], (char *const *)argv);
4163 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4168 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4173 /* We moved the admin/trusted check to be immediately after reading the
4174 configuration file. We leave these prints here to ensure that syslog setup,
4175 logfile setup, and so on has already happened. */
4177 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4178 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4180 /* Only an admin user may start the daemon or force a queue run in the default
4181 configuration, but the queue run restriction can be relaxed. Only an admin
4182 user may request that a message be returned to its sender forthwith. Only an
4183 admin user may specify a debug level greater than D_v (because it might show
4184 passwords, etc. in lookup queries). Only an admin user may request a queue
4185 count. Only an admin user can use the test interface to scan for email
4186 (because Exim will be in the spool dir and able to look at mails). */
4190 BOOL debugset = (debug_selector & ~D_v) != 0;
4191 if (deliver_give_up || daemon_listen || malware_test_file ||
4192 (count_queue && queue_list_requires_admin) ||
4193 (list_queue && queue_list_requires_admin) ||
4194 (queue_interval >= 0 && prod_requires_admin) ||
4195 (debugset && !running_in_test_harness))
4197 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4202 /* If the real user is not root or the exim uid, the argument for passing
4203 in an open TCP/IP connection for another message is not permitted, nor is
4204 running with the -N option for any delivery action, unless this call to exim is
4205 one that supplied an input message, or we are using a patched exim for
4206 regression testing. */
4208 if (real_uid != root_uid && real_uid != exim_uid &&
4209 (continue_hostname != NULL ||
4211 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4212 )) && !running_in_test_harness)
4214 fprintf(stderr, "exim: Permission denied\n");
4215 return EXIT_FAILURE;
4218 /* If the caller is not trusted, certain arguments are ignored when running for
4219 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4220 Note that authority for performing certain actions on messages is tested in the
4221 queue_action() function. */
4223 if (!trusted_caller && !checking)
4225 sender_host_name = sender_host_address = interface_address =
4226 sender_ident = received_protocol = NULL;
4227 sender_host_port = interface_port = 0;
4228 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4231 /* If a sender host address is set, extract the optional port number off the
4232 end of it and check its syntax. Do the same thing for the interface address.
4233 Exim exits if the syntax is bad. */
4237 if (sender_host_address != NULL)
4238 sender_host_port = check_port(sender_host_address);
4239 if (interface_address != NULL)
4240 interface_port = check_port(interface_address);
4243 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4248 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4249 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4253 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4254 return EXIT_FAILURE;
4258 /* If an SMTP message is being received check to see if the standard input is a
4259 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4260 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4265 union sockaddr_46 inetd_sock;
4266 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4267 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4269 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4270 if (family == AF_INET || family == AF_INET6)
4272 union sockaddr_46 interface_sock;
4273 size = sizeof(interface_sock);
4275 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4276 interface_address = host_ntoa(-1, &interface_sock, NULL,
4279 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4281 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4284 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4285 NULL, &sender_host_port);
4286 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4287 "inetd is not supported when mua_wrapper is set");
4292 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4293 return EXIT_FAILURE;
4299 /* If the load average is going to be needed while receiving a message, get it
4300 now for those OS that require the first call to os_getloadavg() to be done as
4301 root. There will be further calls later for each message received. */
4303 #ifdef LOAD_AVG_NEEDS_ROOT
4304 if (receiving_message &&
4305 (queue_only_load >= 0 ||
4306 (is_inetd && smtp_load_reserve >= 0)
4309 load_average = OS_GETLOADAVG();
4313 /* The queue_only configuration option can be overridden by -odx on the command
4314 line, except that if queue_only_override is false, queue_only cannot be unset
4315 from the command line. */
4317 if (queue_only_set && (queue_only_override || arg_queue_only))
4318 queue_only = arg_queue_only;
4320 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4323 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4324 if (arg_smtp_receive_timeout >= 0)
4325 smtp_receive_timeout = arg_smtp_receive_timeout;
4327 /* If Exim was started with root privilege, unless we have already removed the
4328 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4329 except when starting the daemon or doing some kind of delivery or address
4330 testing (-bt). These are the only cases when root need to be retained. We run
4331 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4332 retained only for starting the daemon. We always do the initgroups() in this
4333 situation (controlled by the TRUE below), in order to be as close as possible
4334 to the state Exim usually runs in. */
4336 if (!unprivileged && /* originally had root AND */
4337 !removed_privilege && /* still got root AND */
4338 !daemon_listen && /* not starting the daemon */
4339 queue_interval <= 0 && /* (either kind of daemon) */
4341 deliver_drop_privilege || /* requested unprivileged */
4343 queue_interval < 0 && /* not running the queue */
4344 (msg_action_arg < 0 || /* and */
4345 msg_action != MSG_DELIVER) && /* not delivering and */
4346 (!checking || !address_test_mode) /* not address checking */
4350 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4353 /* When we are retaining a privileged uid, we still change to the exim gid. */
4358 rv = setgid(exim_gid);
4359 /* Impact of failure is that some stuff might end up with an incorrect group.
4360 We track this for failures from root, since any attempt to change privilege
4361 by root should succeed and failures should be examined. For non-root,
4362 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4363 no need to complain then. */
4366 if (!(unprivileged || removed_privilege))
4369 "exim: changing group failed: %s\n", strerror(errno));
4373 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4374 (long int)exim_gid, strerror(errno));
4378 /* Handle a request to scan a file for malware */
4379 if (malware_test_file)
4381 #ifdef WITH_CONTENT_SCAN
4383 set_process_info("scanning file for malware");
4384 result = malware_in_file(malware_test_file);
4387 printf("No malware found.\n");
4392 printf("Malware lookup returned non-okay/fail: %d\n", result);
4396 printf("Malware found: %s\n", malware_name);
4398 printf("Malware scan detected malware of unknown name.\n");
4400 printf("Malware scanning not enabled at compile time.\n");
4405 /* Handle a request to list the delivery queue */
4409 set_process_info("listing the queue");
4410 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4414 /* Handle a request to count the delivery queue */
4418 set_process_info("counting the queue");
4423 /* Handle actions on specific messages, except for the force delivery and
4424 message load actions, which are done below. Some actions take a whole list of
4425 message ids, which are known to continue up to the end of the arguments. Others
4426 take a single message id and then operate on the recipients list. */
4428 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4430 int yield = EXIT_SUCCESS;
4431 set_process_info("acting on specified messages");
4433 if (!one_msg_action)
4435 for (i = msg_action_arg; i < argc; i++)
4436 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4437 yield = EXIT_FAILURE;
4440 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4441 recipients_arg)) yield = EXIT_FAILURE;
4445 /* We used to set up here to skip reading the ACL section, on
4446 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4447 Now, since the intro of the ${acl } expansion, ACL definitions may be
4448 needed in transports so we lost the optimisation. */
4452 /* The configuration data will have been read into POOL_PERM because we won't
4453 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4454 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4455 configuration were read into POOL_MAIN, because we don't do any resets till
4456 later on. However, it seems right, and it does ensure that both pools get used.
4459 store_pool = POOL_MAIN;
4461 /* Handle the -brt option. This is for checking out retry configurations.
4462 The next three arguments are a domain name or a complete address, and
4463 optionally two error numbers. All it does is to call the function that
4464 scans the retry configuration data. */
4466 if (test_retry_arg >= 0)
4468 retry_config *yield;
4469 int basic_errno = 0;
4473 if (test_retry_arg >= argc)
4475 printf("-brt needs a domain or address argument\n");
4476 exim_exit(EXIT_FAILURE);
4478 s1 = argv[test_retry_arg++];
4481 /* If the first argument contains no @ and no . it might be a local user
4482 or it might be a single-component name. Treat as a domain. */
4484 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4486 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4487 "being \ntreated as a one-component domain, not as a local part.\n\n",
4491 /* There may be an optional second domain arg. */
4493 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4494 s2 = argv[test_retry_arg++];
4496 /* The final arg is an error name */
4498 if (test_retry_arg < argc)
4500 uschar *ss = argv[test_retry_arg];
4502 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4505 printf("%s\n", CS error);
4506 return EXIT_FAILURE;
4509 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4510 code > 100 as an error is for matching codes to the decade. Turn them into
4511 a real error code, off the decade. */
4513 if (basic_errno == ERRNO_MAIL4XX ||
4514 basic_errno == ERRNO_RCPT4XX ||
4515 basic_errno == ERRNO_DATA4XX)
4517 int code = (more_errno >> 8) & 255;
4519 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4520 else if (code > 100)
4521 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4525 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4526 if (yield == NULL) printf("No retry information found\n"); else
4529 more_errno = yield->more_errno;
4530 printf("Retry rule: %s ", yield->pattern);
4532 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4534 printf("quota%s%s ",
4535 (more_errno > 0)? "_" : "",
4536 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4538 else if (yield->basic_errno == ECONNREFUSED)
4540 printf("refused%s%s ",
4541 (more_errno > 0)? "_" : "",
4542 (more_errno == 'M')? "MX" :
4543 (more_errno == 'A')? "A" : "");
4545 else if (yield->basic_errno == ETIMEDOUT)
4548 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4550 if (more_errno != 0) printf("_%s",
4551 (more_errno == 'M')? "MX" : "A");
4554 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4555 printf("auth_failed ");
4558 for (r = yield->rules; r != NULL; r = r->next)
4560 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4561 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4567 printf(",%d.", x/1000);
4581 exim_exit(EXIT_SUCCESS);
4584 /* Handle a request to list one or more configuration options */
4585 /* If -n was set, we suppress some information */
4589 set_process_info("listing variables");
4590 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4591 else for (i = recipients_arg; i < argc; i++)
4594 (Ustrcmp(argv[i], "router") == 0 ||
4595 Ustrcmp(argv[i], "transport") == 0 ||
4596 Ustrcmp(argv[i], "authenticator") == 0 ||
4597 Ustrcmp(argv[i], "macro") == 0 ||
4598 Ustrcmp(argv[i], "environment") == 0))
4600 readconf_print(argv[i+1], argv[i], flag_n);
4603 else readconf_print(argv[i], NULL, flag_n);
4605 exim_exit(EXIT_SUCCESS);
4610 set_process_info("listing config");
4611 readconf_print(US"config", NULL, flag_n);
4612 exim_exit(EXIT_SUCCESS);
4616 /* Initialise subsystems as required */
4617 #ifndef DISABLE_DKIM
4623 /* Handle a request to deliver one or more messages that are already on the
4624 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4625 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4627 Delivery of specific messages is typically used for a small number when
4628 prodding by hand (when the option forced_delivery will be set) or when
4629 re-execing to regain root privilege. Each message delivery must happen in a
4630 separate process, so we fork a process for each one, and run them sequentially
4631 so that debugging output doesn't get intertwined, and to avoid spawning too
4632 many processes if a long list is given. However, don't fork for the last one;
4633 this saves a process in the common case when Exim is called to deliver just one
4636 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4638 if (prod_requires_admin && !admin_user)
4640 fprintf(stderr, "exim: Permission denied\n");
4641 exim_exit(EXIT_FAILURE);
4643 set_process_info("delivering specified messages");
4644 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4645 for (i = msg_action_arg; i < argc; i++)
4650 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4651 else if ((pid = fork()) == 0)
4653 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4654 _exit(EXIT_SUCCESS);
4658 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4660 exim_exit(EXIT_FAILURE);
4664 exim_exit(EXIT_SUCCESS);
4668 /* If only a single queue run is requested, without SMTP listening, we can just
4669 turn into a queue runner, with an optional starting message id. */
4671 if (queue_interval == 0 && !daemon_listen)
4673 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4674 (start_queue_run_id == NULL)? US"" : US" starting at ",
4675 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4676 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4677 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4679 set_process_info("running the '%s' queue (single queue run)", queue_name);
4681 set_process_info("running the queue (single queue run)");
4682 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4683 exim_exit(EXIT_SUCCESS);
4687 /* Find the login name of the real user running this process. This is always
4688 needed when receiving a message, because it is written into the spool file. It
4689 may also be used to construct a from: or a sender: header, and in this case we
4690 need the user's full name as well, so save a copy of it, checked for RFC822
4691 syntax and munged if necessary, if it hasn't previously been set by the -F
4692 argument. We may try to get the passwd entry more than once, in case NIS or
4693 other delays are in evidence. Save the home directory for use in filter testing
4698 if ((pw = getpwuid(real_uid)) != NULL)
4700 originator_login = string_copy(US pw->pw_name);
4701 originator_home = string_copy(US pw->pw_dir);
4703 /* If user name has not been set by -F, set it from the passwd entry
4704 unless -f has been used to set the sender address by a trusted user. */
4706 if (originator_name == NULL)
4708 if (sender_address == NULL ||
4709 (!trusted_caller && filter_test == FTEST_NONE))
4711 uschar *name = US pw->pw_gecos;
4712 uschar *amp = Ustrchr(name, '&');
4715 /* Most Unix specify that a '&' character in the gecos field is
4716 replaced by a copy of the login name, and some even specify that
4717 the first character should be upper cased, so that's what we do. */
4722 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4723 amp - name, name, &loffset, originator_login, amp + 1);
4724 buffer[loffset] = toupper(buffer[loffset]);
4728 /* If a pattern for matching the gecos field was supplied, apply
4729 it and then expand the name string. */
4731 if (gecos_pattern != NULL && gecos_name != NULL)
4734 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4736 if (regex_match_and_setup(re, name, 0, -1))
4738 uschar *new_name = expand_string(gecos_name);
4740 if (new_name != NULL)
4742 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4743 "gecos field \"%s\"\n", new_name, name);
4746 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4747 "\"%s\": %s\n", gecos_name, expand_string_message);
4749 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4750 "gecos field \"%s\"\n", gecos_pattern, name);
4751 store_free((void *)re);
4753 originator_name = string_copy(name);
4756 /* A trusted caller has used -f but not -F */
4758 else originator_name = US"";
4761 /* Break the retry loop */
4766 if (++i > finduser_retries) break;
4770 /* If we cannot get a user login, log the incident and give up, unless the
4771 configuration specifies something to use. When running in the test harness,
4772 any setting of unknown_login overrides the actual name. */
4774 if (originator_login == NULL || running_in_test_harness)
4776 if (unknown_login != NULL)
4778 originator_login = expand_string(unknown_login);
4779 if (originator_name == NULL && unknown_username != NULL)
4780 originator_name = expand_string(unknown_username);
4781 if (originator_name == NULL) originator_name = US"";
4783 if (originator_login == NULL)
4784 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4788 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4791 originator_name = string_copy(parse_fix_phrase(originator_name,
4792 Ustrlen(originator_name), big_buffer, big_buffer_size));
4794 /* If a message is created by this call of Exim, the uid/gid of its originator
4795 are those of the caller. These values are overridden if an existing message is
4796 read in from the spool. */
4798 originator_uid = real_uid;
4799 originator_gid = real_gid;
4801 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4802 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4804 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4805 returns. We leave this till here so that the originator_ fields are available
4806 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4809 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4813 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4814 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4815 "mua_wrapper is set");
4820 /* If the sender ident has not been set (by a trusted caller) set it to
4821 the caller. This will get overwritten below for an inetd call. If a trusted
4822 caller has set it empty, unset it. */
4824 if (sender_ident == NULL) sender_ident = originator_login;
4825 else if (sender_ident[0] == 0) sender_ident = NULL;
4827 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4828 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4829 originator_* variables set. */
4831 if (test_rewrite_arg >= 0)
4833 really_exim = FALSE;
4834 if (test_rewrite_arg >= argc)
4836 printf("-brw needs an address argument\n");
4837 exim_exit(EXIT_FAILURE);
4839 rewrite_test(argv[test_rewrite_arg]);
4840 exim_exit(EXIT_SUCCESS);
4843 /* A locally-supplied message is considered to be coming from a local user
4844 unless a trusted caller supplies a sender address with -f, or is passing in the
4845 message via SMTP (inetd invocation or otherwise). */
4847 if ((sender_address == NULL && !smtp_input) ||
4848 (!trusted_caller && filter_test == FTEST_NONE))
4850 sender_local = TRUE;
4852 /* A trusted caller can supply authenticated_sender and authenticated_id
4853 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4854 defaults except when host checking. */
4856 if (authenticated_sender == NULL && !host_checking)
4857 authenticated_sender = string_sprintf("%s@%s", originator_login,
4858 qualify_domain_sender);
4859 if (authenticated_id == NULL && !host_checking)
4860 authenticated_id = originator_login;
4863 /* Trusted callers are always permitted to specify the sender address.
4864 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4865 is specified is the empty address. However, if a trusted caller does not
4866 specify a sender address for SMTP input, we leave sender_address unset. This
4867 causes the MAIL commands to be honoured. */
4869 if ((!smtp_input && sender_address == NULL) ||
4870 !receive_check_set_sender(sender_address))
4872 /* Either the caller is not permitted to set a general sender, or this is
4873 non-SMTP input and the trusted caller has not set a sender. If there is no
4874 sender, or if a sender other than <> is set, override with the originator's
4875 login (which will get qualified below), except when checking things. */
4877 if (sender_address == NULL /* No sender_address set */
4879 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4880 !checking)) /* Not running tests, including filter tests */
4882 sender_address = originator_login;
4883 sender_address_forced = FALSE;
4884 sender_address_domain = 0;
4888 /* Remember whether an untrusted caller set the sender address */
4890 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4892 /* Ensure that the sender address is fully qualified unless it is the empty
4893 address, which indicates an error message, or doesn't exist (root caller, smtp
4894 interface, no -f argument). */
4896 if (sender_address != NULL && sender_address[0] != 0 &&
4897 sender_address_domain == 0)
4898 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4899 qualify_domain_sender);
4901 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4903 /* Handle a request to verify a list of addresses, or test them for delivery.
4904 This must follow the setting of the sender address, since routers can be
4905 predicated upon the sender. If no arguments are given, read addresses from
4906 stdin. Set debug_level to at least D_v to get full output for address testing.
4909 if (verify_address_mode || address_test_mode)
4912 int flags = vopt_qualify;
4914 if (verify_address_mode)
4916 if (!verify_as_sender) flags |= vopt_is_recipient;
4917 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4922 flags |= vopt_is_recipient;
4923 debug_selector |= D_v;
4924 debug_file = stderr;
4925 debug_fd = fileno(debug_file);
4926 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4929 if (recipients_arg < argc)
4931 while (recipients_arg < argc)
4933 uschar *s = argv[recipients_arg++];
4936 BOOL finished = FALSE;
4937 uschar *ss = parse_find_address_end(s, FALSE);
4938 if (*ss == ',') *ss = 0; else finished = TRUE;
4939 test_address(s, flags, &exit_value);
4942 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4949 uschar *s = get_stdinput(NULL, NULL);
4950 if (s == NULL) break;
4951 test_address(s, flags, &exit_value);
4955 exim_exit(exit_value);
4958 /* Handle expansion checking. Either expand items on the command line, or read
4959 from stdin if there aren't any. If -Mset was specified, load the message so
4960 that its variables can be used, but restrict this facility to admin users.
4961 Otherwise, if -bem was used, read a message from stdin. */
4965 dns_init(FALSE, FALSE, FALSE);
4966 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4968 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4971 fprintf(stderr, "exim: permission denied\n");
4974 message_id = argv[msg_action_arg];
4975 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4976 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4977 printf ("Failed to load message datafile %s\n", message_id);
4978 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4979 printf ("Failed to load message %s\n", message_id);
4982 /* Read a test message from a file. We fudge it up to be on stdin, saving
4983 stdin itself for later reading of expansion strings. */
4985 else if (expansion_test_message != NULL)
4987 int save_stdin = dup(0);
4988 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4991 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4993 return EXIT_FAILURE;
4996 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4997 message_ended = END_NOTENDED;
4998 read_message_body(receive_msg(extract_recipients));
4999 message_linecount += body_linecount;
5000 (void)dup2(save_stdin, 0);
5001 (void)close(save_stdin);
5002 clearerr(stdin); /* Required by Darwin */
5005 /* Allow $recipients for this testing */
5007 enable_dollar_recipients = TRUE;
5009 /* Expand command line items */
5011 if (recipients_arg < argc)
5013 while (recipients_arg < argc)
5015 uschar *s = argv[recipients_arg++];
5016 uschar *ss = expand_string(s);
5017 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5018 else printf("%s\n", CS ss);
5026 char *(*fn_readline)(const char *) = NULL;
5027 void (*fn_addhist)(const char *) = NULL;
5030 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5036 uschar *source = get_stdinput(fn_readline, fn_addhist);
5037 if (source == NULL) break;
5038 ss = expand_string(source);
5040 printf ("Failed: %s\n", expand_string_message);
5041 else printf("%s\n", CS ss);
5045 if (dlhandle != NULL) dlclose(dlhandle);
5049 /* The data file will be open after -Mset */
5051 if (deliver_datafile >= 0)
5053 (void)close(deliver_datafile);
5054 deliver_datafile = -1;
5057 exim_exit(EXIT_SUCCESS);
5061 /* The active host name is normally the primary host name, but it can be varied
5062 for hosts that want to play several parts at once. We need to ensure that it is
5063 set for host checking, and for receiving messages. */
5065 smtp_active_hostname = primary_hostname;
5066 if (raw_active_hostname != NULL)
5068 uschar *nah = expand_string(raw_active_hostname);
5071 if (!expand_string_forcedfail)
5072 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5073 "(smtp_active_hostname): %s", raw_active_hostname,
5074 expand_string_message);
5076 else if (nah[0] != 0) smtp_active_hostname = nah;
5079 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5080 given IP address so that the blocking and relay configuration can be tested.
5081 Unless a sender_ident was set by -oMt, we discard it (the default is the
5082 caller's login name). An RFC 1413 call is made only if we are running in the
5083 test harness and an incoming interface and both ports are specified, because
5084 there is no TCP/IP call to find the ident for. */
5091 if (!sender_ident_set)
5093 sender_ident = NULL;
5094 if (running_in_test_harness && sender_host_port != 0 &&
5095 interface_address != NULL && interface_port != 0)
5096 verify_get_ident(1413);
5099 /* In case the given address is a non-canonical IPv6 address, canonicize
5100 it. The code works for both IPv4 and IPv6, as it happens. */
5102 size = host_aton(sender_host_address, x);
5103 sender_host_address = store_get(48); /* large enough for full IPv6 */
5104 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5106 /* Now set up for testing */
5108 host_build_sender_fullhost();
5112 sender_local = FALSE;
5113 sender_host_notsocket = TRUE;
5114 debug_file = stderr;
5115 debug_fd = fileno(debug_file);
5116 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5117 "**** but without any ident (RFC 1413) callback.\n"
5118 "**** This is not for real!\n\n",
5119 sender_host_address);
5121 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5122 if (verify_check_host(&hosts_connection_nolog) == OK)
5123 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5124 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5126 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5127 because a log line has already been written for all its failure exists
5128 (usually "connection refused: <reason>") and writing another one is
5129 unnecessary clutter. */
5131 if (smtp_start_session())
5133 reset_point = store_get(0);
5136 store_reset(reset_point);
5137 if (smtp_setup_msg() <= 0) break;
5138 if (!receive_msg(FALSE)) break;
5142 exim_exit(EXIT_SUCCESS);
5146 /* Arrange for message reception if recipients or SMTP were specified;
5147 otherwise complain unless a version print (-bV) happened or this is a filter
5148 verification test or info dump.
5149 In the former case, show the configuration file name. */
5151 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5153 if (version_printed)
5155 printf("Configuration file is %s\n", config_main_filename);
5156 return EXIT_SUCCESS;
5159 if (info_flag != CMDINFO_NONE)
5161 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5162 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5165 if (filter_test == FTEST_NONE)
5166 exim_usage(called_as);
5170 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5171 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5172 that we are not called from inetd, because that is rejected above. The
5173 following configuration settings are forced here:
5175 (1) Synchronous delivery (-odi)
5176 (2) Errors to stderr (-oep == -oeq)
5177 (3) No parallel remote delivery
5178 (4) Unprivileged delivery
5180 We don't force overall queueing options because there are several of them;
5181 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5182 to override any SMTP queueing. */
5186 synchronous_delivery = TRUE;
5187 arg_error_handling = ERRORS_STDERR;
5188 remote_max_parallel = 1;
5189 deliver_drop_privilege = TRUE;
5191 queue_smtp_domains = NULL;
5193 message_utf8_downconvert = -1; /* convert-if-needed */
5198 /* Prepare to accept one or more new messages on the standard input. When a
5199 message has been read, its id is returned in message_id[]. If doing immediate
5200 delivery, we fork a delivery process for each received message, except for the
5201 last one, where we can save a process switch.
5203 It is only in non-smtp mode that error_handling is allowed to be changed from
5204 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5205 sendmail error modes other than -oem ever actually used? Later: yes.) */
5207 if (!smtp_input) error_handling = arg_error_handling;
5209 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5210 logging being sent down the socket and make an identd call to get the
5215 (void)fclose(stderr);
5216 exim_nullstd(); /* Re-open to /dev/null */
5217 verify_get_ident(IDENT_PORT);
5218 host_build_sender_fullhost();
5219 set_process_info("handling incoming connection from %s via inetd",
5223 /* If the sender host address has been set, build sender_fullhost if it hasn't
5224 already been done (which it will have been for inetd). This caters for the
5225 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5226 so that the test for IP options is skipped for -bs input. */
5228 if (sender_host_address != NULL && sender_fullhost == NULL)
5230 host_build_sender_fullhost();
5231 set_process_info("handling incoming connection from %s via -oMa",
5233 sender_host_notsocket = TRUE;
5236 /* Otherwise, set the sender host as unknown except for inetd calls. This
5237 prevents host checking in the case of -bs not from inetd and also for -bS. */
5239 else if (!is_inetd) sender_host_unknown = TRUE;
5241 /* If stdout does not exist, then dup stdin to stdout. This can happen
5242 if exim is started from inetd. In this case fd 0 will be set to the socket,
5243 but fd 1 will not be set. This also happens for passed SMTP channels. */
5245 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5247 /* Set up the incoming protocol name and the state of the program. Root is
5248 allowed to force received protocol via the -oMr option above. If we have come
5249 via inetd, the process info has already been set up. We don't set
5250 received_protocol here for smtp input, as it varies according to
5251 batch/HELO/EHLO/AUTH/TLS. */
5255 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5256 smtp_batched_input? "batched " : "",
5257 (sender_address!= NULL)? sender_address : originator_login);
5261 if (received_protocol == NULL)
5262 received_protocol = string_sprintf("local%s", called_as);
5263 set_process_info("accepting a local non-SMTP message from <%s>",
5267 /* Initialize the session_local_queue-only flag (this will be ignored if
5268 mua_wrapper is set) */
5271 session_local_queue_only = queue_only;
5273 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5274 the spool if so configured. On failure, we must not attempt to send an error
5275 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5276 error code is given.) */
5278 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5280 fprintf(stderr, "exim: insufficient disk space\n");
5281 return EXIT_FAILURE;
5284 /* If this is smtp input of any kind, real or batched, handle the start of the
5287 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5288 because a log line has already been written for all its failure exists
5289 (usually "connection refused: <reason>") and writing another one is
5290 unnecessary clutter. */
5296 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5297 if (verify_check_host(&hosts_connection_nolog) == OK)
5298 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5299 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5300 if (!smtp_start_session())
5303 exim_exit(EXIT_SUCCESS);
5307 /* Otherwise, set up the input size limit here. */
5311 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5312 if (expand_string_message != NULL)
5314 if (thismessage_size_limit == -1)
5315 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5316 "message_size_limit: %s", expand_string_message);
5318 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5319 "message_size_limit: %s", expand_string_message);
5323 /* Loop for several messages when reading SMTP input. If we fork any child
5324 processes, we don't want to wait for them unless synchronous delivery is
5325 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5326 same as SIG_DFL, despite the fact that documentation often lists the default as
5327 "ignore". This is a confusing area. This is what I know:
5329 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5330 processes that complete simply to go away without ever becoming defunct. You
5331 can't then wait for them - but we don't want to wait for them in the
5332 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5333 happen for all OS (e.g. *BSD is different).
5335 But that's not the end of the story. Some (many? all?) systems have the
5336 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5337 has by default, so it seems that the difference is merely one of default
5338 (compare restarting vs non-restarting signals).
5340 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5341 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5342 of the loop below. Paranoia rules.
5344 February 2003: That's *still* not the end of the story. There are now versions
5345 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5346 process then calls waitpid(), a grumble is written to the system log, because
5347 this is logically inconsistent. In other words, it doesn't like the paranoia.
5348 As a consequenc of this, the waitpid() below is now excluded if we are sure
5349 that SIG_IGN works. */
5351 if (!synchronous_delivery)
5354 struct sigaction act;
5355 act.sa_handler = SIG_IGN;
5356 sigemptyset(&(act.sa_mask));
5357 act.sa_flags = SA_NOCLDWAIT;
5358 sigaction(SIGCHLD, &act, NULL);
5360 signal(SIGCHLD, SIG_IGN);
5364 /* Save the current store pool point, for resetting at the start of
5365 each message, and save the real sender address, if any. */
5367 reset_point = store_get(0);
5368 real_sender_address = sender_address;
5370 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5371 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5376 store_reset(reset_point);
5379 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5380 input and build the recipients list, before calling receive_msg() to read the
5381 message proper. Whatever sender address is given in the SMTP transaction is
5382 often ignored for local senders - we use the actual sender, which is normally
5383 either the underlying user running this process or a -f argument provided by
5384 a trusted caller. It is saved in real_sender_address. The test for whether to
5385 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5390 if ((rc = smtp_setup_msg()) > 0)
5392 if (real_sender_address != NULL &&
5393 !receive_check_set_sender(sender_address))
5395 sender_address = raw_sender = real_sender_address;
5396 sender_address_unrewritten = NULL;
5399 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5400 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5401 the very end. The result of the ACL is ignored (as for other non-SMTP
5402 messages). It is run for its potential side effects. */
5404 if (smtp_batched_input && acl_not_smtp_start != NULL)
5406 uschar *user_msg, *log_msg;
5407 enable_dollar_recipients = TRUE;
5408 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5409 &user_msg, &log_msg);
5410 enable_dollar_recipients = FALSE;
5413 /* Now get the data for the message */
5415 more = receive_msg(extract_recipients);
5416 if (message_id[0] == 0)
5419 smtp_log_no_mail(); /* Log no mail if configured */
5420 exim_exit(EXIT_FAILURE);
5425 smtp_log_no_mail(); /* Log no mail if configured */
5426 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5430 /* In the non-SMTP case, we have all the information from the command
5431 line, but must process it in case it is in the more general RFC822
5432 format, and in any case, to detect syntax errors. Also, it appears that
5433 the use of comma-separated lists as single arguments is common, so we
5434 had better support them. */
5440 int count = argc - recipients_arg;
5441 uschar **list = argv + recipients_arg;
5443 /* These options cannot be changed dynamically for non-SMTP messages */
5445 active_local_sender_retain = local_sender_retain;
5446 active_local_from_check = local_from_check;
5448 /* Save before any rewriting */
5450 raw_sender = string_copy(sender_address);
5452 /* Loop for each argument */
5454 for (i = 0; i < count; i++)
5456 int start, end, domain;
5458 uschar *s = list[i];
5460 /* Loop for each comma-separated address */
5464 BOOL finished = FALSE;
5466 uschar *ss = parse_find_address_end(s, FALSE);
5468 if (*ss == ',') *ss = 0; else finished = TRUE;
5470 /* Check max recipients - if -t was used, these aren't recipients */
5472 if (recipients_max > 0 && ++rcount > recipients_max &&
5473 !extract_recipients)
5474 if (error_handling == ERRORS_STDERR)
5476 fprintf(stderr, "exim: too many recipients\n");
5477 exim_exit(EXIT_FAILURE);
5482 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5483 errors_sender_rc : EXIT_FAILURE;
5488 BOOL b = allow_utf8_domains;
5489 allow_utf8_domains = TRUE;
5492 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5495 if (string_is_utf8(recipient))
5496 message_smtputf8 = TRUE;
5498 allow_utf8_domains = b;
5501 if (domain == 0 && !allow_unqualified_recipient)
5504 errmess = US"unqualified recipient address not allowed";
5507 if (recipient == NULL)
5509 if (error_handling == ERRORS_STDERR)
5511 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5512 string_printing(list[i]), errmess);
5513 exim_exit(EXIT_FAILURE);
5519 eblock.text1 = string_printing(list[i]);
5520 eblock.text2 = errmess;
5522 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5523 errors_sender_rc : EXIT_FAILURE;
5527 receive_add_recipient(recipient, -1);
5530 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5534 /* Show the recipients when debugging */
5539 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5540 if (recipients_list != NULL)
5542 debug_printf("Recipients:\n");
5543 for (i = 0; i < recipients_count; i++)
5544 debug_printf(" %s\n", recipients_list[i].address);
5548 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5549 ignored; rejecting here would just add complication, and it can just as
5550 well be done later. Allow $recipients to be visible in the ACL. */
5552 if (acl_not_smtp_start != NULL)
5554 uschar *user_msg, *log_msg;
5555 enable_dollar_recipients = TRUE;
5556 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5557 &user_msg, &log_msg);
5558 enable_dollar_recipients = FALSE;
5561 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5562 will just read the headers for the message, and not write anything onto the
5565 message_ended = END_NOTENDED;
5566 more = receive_msg(extract_recipients);
5568 /* more is always FALSE here (not SMTP message) when reading a message
5569 for real; when reading the headers of a message for filter testing,
5570 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5572 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5573 } /* Non-SMTP message reception */
5575 /* If this is a filter testing run, there are headers in store, but
5576 no message on the spool. Run the filtering code in testing mode, setting
5577 the domain to the qualify domain and the local part to the current user,
5578 unless they have been set by options. The prefix and suffix are left unset
5579 unless specified. The the return path is set to to the sender unless it has
5580 already been set from a return-path header in the message. */
5582 if (filter_test != FTEST_NONE)
5584 deliver_domain = (ftest_domain != NULL)?
5585 ftest_domain : qualify_domain_recipient;
5586 deliver_domain_orig = deliver_domain;
5587 deliver_localpart = (ftest_localpart != NULL)?
5588 ftest_localpart : originator_login;
5589 deliver_localpart_orig = deliver_localpart;
5590 deliver_localpart_prefix = ftest_prefix;
5591 deliver_localpart_suffix = ftest_suffix;
5592 deliver_home = originator_home;
5594 if (return_path == NULL)
5596 printf("Return-path copied from sender\n");
5597 return_path = string_copy(sender_address);
5600 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5601 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5603 receive_add_recipient(
5604 string_sprintf("%s%s%s@%s",
5605 (ftest_prefix == NULL)? US"" : ftest_prefix,
5607 (ftest_suffix == NULL)? US"" : ftest_suffix,
5608 deliver_domain), -1);
5610 printf("Recipient = %s\n", recipients_list[0].address);
5611 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5612 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5614 if (chdir("/")) /* Get away from wherever the user is running this from */
5616 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5617 exim_exit(EXIT_FAILURE);
5620 /* Now we run either a system filter test, or a user filter test, or both.
5621 In the latter case, headers added by the system filter will persist and be
5622 available to the user filter. We need to copy the filter variables
5625 if ((filter_test & FTEST_SYSTEM) != 0)
5627 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5628 exim_exit(EXIT_FAILURE);
5631 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5633 if ((filter_test & FTEST_USER) != 0)
5635 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5636 exim_exit(EXIT_FAILURE);
5639 exim_exit(EXIT_SUCCESS);
5642 /* Else act on the result of message reception. We should not get here unless
5643 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5644 will be TRUE. If it is not, check on the number of messages received in this
5647 if (!session_local_queue_only &&
5648 smtp_accept_queue_per_connection > 0 &&
5649 receive_messagecount > smtp_accept_queue_per_connection)
5651 session_local_queue_only = TRUE;
5652 queue_only_reason = 2;
5655 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5656 and queue_only_load is set, check that the load average is below it. If it is
5657 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5658 default), we put the whole session into queue_only mode. It then remains this
5659 way for any subsequent messages on the same SMTP connection. This is a
5660 deliberate choice; even though the load average may fall, it doesn't seem
5661 right to deliver later messages on the same call when not delivering earlier
5662 ones. However, there are odd cases where this is not wanted, so this can be
5663 changed by setting queue_only_load_latch false. */
5665 local_queue_only = session_local_queue_only;
5666 if (!local_queue_only && queue_only_load >= 0)
5668 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5669 if (local_queue_only)
5671 queue_only_reason = 3;
5672 if (queue_only_load_latch) session_local_queue_only = TRUE;
5676 /* If running as an MUA wrapper, all queueing options and freezing options
5680 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5682 /* Log the queueing here, when it will get a message id attached, but
5683 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5686 if (local_queue_only) switch(queue_only_reason)
5689 log_write(L_delay_delivery,
5690 LOG_MAIN, "no immediate delivery: more than %d messages "
5691 "received in one connection", smtp_accept_queue_per_connection);
5695 log_write(L_delay_delivery,
5696 LOG_MAIN, "no immediate delivery: load average %.2f",
5697 (double)load_average/1000.0);
5701 /* Else do the delivery unless the ACL or local_scan() called for queue only
5702 or froze the message. Always deliver in a separate process. A fork failure is
5703 not a disaster, as the delivery will eventually happen on a subsequent queue
5704 run. The search cache must be tidied before the fork, as the parent will
5705 do it before exiting. The child will trigger a lookup failure and
5706 thereby defer the delivery if it tries to use (for example) a cached ldap
5707 connection that the parent has called unbind on. */
5709 else if (!queue_only_policy && !deliver_freeze)
5714 if ((pid = fork()) == 0)
5717 close_unwanted(); /* Close unwanted file descriptors and TLS */
5718 exim_nullstd(); /* Ensure std{in,out,err} exist */
5720 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5721 mode, deliver_drop_privilege is forced TRUE). */
5723 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5725 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5726 2, US"-Mc", message_id);
5727 /* Control does not return here. */
5730 /* No need to re-exec */
5732 rc = deliver_message(message_id, FALSE, FALSE);
5734 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5735 EXIT_SUCCESS : EXIT_FAILURE);
5740 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5741 "process: %s", strerror(errno));
5744 /* In the parent, wait if synchronous delivery is required. This will
5745 always be the case in MUA wrapper mode. */
5747 else if (synchronous_delivery)
5750 while (wait(&status) != pid);
5751 if ((status & 0x00ff) != 0)
5752 log_write(0, LOG_MAIN|LOG_PANIC,
5753 "process %d crashed with signal %d while delivering %s",
5754 (int)pid, status & 0x00ff, message_id);
5755 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5759 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5760 automatically reaps children (see comments above the loop), clear away any
5761 finished subprocesses here, in case there are lots of messages coming in
5762 from the same source. */
5764 #ifndef SIG_IGN_WORKS
5765 while (waitpid(-1, NULL, WNOHANG) > 0);
5769 exim_exit(EXIT_SUCCESS); /* Never returns */
5770 return 0; /* To stop compiler warning */