1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
193 /*************************************************
194 * Handler for SIGUSR1 *
195 *************************************************/
197 /* SIGUSR1 causes any exim process to write to the process log details of
198 what it is currently doing. It will only be used if the OS is capable of
199 setting up a handler that causes automatic restarting of any system call
200 that is in progress at the time.
202 This function takes care to be signal-safe.
204 Argument: the signal number (SIGUSR1)
209 usr1_handler(int sig)
213 os_restarting_signal(sig, usr1_handler);
215 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
218 /* If we are already running as the Exim user, try to create it in the
219 current process (assuming spool_directory exists). Otherwise, if we are
220 root, do the creation in an exim:exim subprocess. */
222 int euid = geteuid();
223 if (euid == exim_uid)
224 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
225 else if (euid == root_uid)
226 fd = log_create_as_exim(process_log_path);
229 /* If we are neither exim nor root, or if we failed to create the log file,
230 give up. There is not much useful we can do with errors, since we don't want
231 to disrupt whatever is going on outside the signal handler. */
235 (void)write(fd, process_info, process_info_len);
241 /*************************************************
243 *************************************************/
245 /* This handler is enabled most of the time that Exim is running. The handler
246 doesn't actually get used unless alarm() has been called to set a timer, to
247 place a time limit on a system call of some kind. When the handler is run, it
250 There are some other SIGALRM handlers that are used in special cases when more
251 than just a flag setting is required; for example, when reading a message's
252 input. These are normally set up in the code module that uses them, and the
253 SIGALRM handler is reset to this one afterwards.
255 Argument: the signal value (SIGALRM)
260 sigalrm_handler(int sig)
262 sig = sig; /* Keep picky compilers happy */
264 os_non_restarting_signal(SIGALRM, sigalrm_handler);
269 /*************************************************
270 * Sleep for a fractional time interval *
271 *************************************************/
273 /* This function is called by millisleep() and exim_wait_tick() to wait for a
274 period of time that may include a fraction of a second. The coding is somewhat
275 tedious. We do not expect setitimer() ever to fail, but if it does, the process
276 will wait for ever, so we panic in this instance. (There was a case of this
277 when a bug in a function that calls milliwait() caused it to pass invalid data.
278 That's when I added the check. :-)
280 We assume it to be not worth sleeping for under 100us; this value will
281 require revisiting as hardware advances. This avoids the issue of
282 a zero-valued timer setting meaning "never fire".
284 Argument: an itimerval structure containing the interval
289 milliwait(struct itimerval *itval)
292 sigset_t old_sigmask;
294 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
296 (void)sigemptyset(&sigmask); /* Empty mask */
297 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
298 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
299 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
300 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
301 "setitimer() failed: %s", strerror(errno));
302 (void)sigfillset(&sigmask); /* All signals */
303 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
304 (void)sigsuspend(&sigmask); /* Until SIGALRM */
305 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
311 /*************************************************
312 * Millisecond sleep function *
313 *************************************************/
315 /* The basic sleep() function has a granularity of 1 second, which is too rough
316 in some cases - for example, when using an increasing delay to slow down
319 Argument: number of millseconds
326 struct itimerval itval;
327 itval.it_interval.tv_sec = 0;
328 itval.it_interval.tv_usec = 0;
329 itval.it_value.tv_sec = msec/1000;
330 itval.it_value.tv_usec = (msec % 1000) * 1000;
336 /*************************************************
337 * Compare microsecond times *
338 *************************************************/
345 Returns: -1, 0, or +1
349 exim_tvcmp(struct timeval *t1, struct timeval *t2)
351 if (t1->tv_sec > t2->tv_sec) return +1;
352 if (t1->tv_sec < t2->tv_sec) return -1;
353 if (t1->tv_usec > t2->tv_usec) return +1;
354 if (t1->tv_usec < t2->tv_usec) return -1;
361 /*************************************************
362 * Clock tick wait function *
363 *************************************************/
365 /* Exim uses a time + a pid to generate a unique identifier in two places: its
366 message IDs, and in file names for maildir deliveries. Because some OS now
367 re-use pids within the same second, sub-second times are now being used.
368 However, for absolute certaintly, we must ensure the clock has ticked before
369 allowing the relevant process to complete. At the time of implementation of
370 this code (February 2003), the speed of processors is such that the clock will
371 invariably have ticked already by the time a process has done its job. This
372 function prepares for the time when things are faster - and it also copes with
373 clocks that go backwards.
376 then_tv A timeval which was used to create uniqueness; its usec field
377 has been rounded down to the value of the resolution.
378 We want to be sure the current time is greater than this.
379 resolution The resolution that was used to divide the microseconds
380 (1 for maildir, larger for message ids)
386 exim_wait_tick(struct timeval *then_tv, int resolution)
388 struct timeval now_tv;
389 long int now_true_usec;
391 (void)gettimeofday(&now_tv, NULL);
392 now_true_usec = now_tv.tv_usec;
393 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
395 if (exim_tvcmp(&now_tv, then_tv) <= 0)
397 struct itimerval itval;
398 itval.it_interval.tv_sec = 0;
399 itval.it_interval.tv_usec = 0;
400 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
401 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
403 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
404 negative value for the microseconds is possible only in the case when "now"
405 is more than a second less than "then". That means that itval.it_value.tv_sec
406 is greater than zero. The following correction is therefore safe. */
408 if (itval.it_value.tv_usec < 0)
410 itval.it_value.tv_usec += 1000000;
411 itval.it_value.tv_sec -= 1;
414 DEBUG(D_transport|D_receive)
416 if (!running_in_test_harness)
418 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
419 then_tv->tv_sec, (long) then_tv->tv_usec,
420 now_tv.tv_sec, (long) now_tv.tv_usec);
421 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
422 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
433 /*************************************************
434 * Call fopen() with umask 777 and adjust mode *
435 *************************************************/
437 /* Exim runs with umask(0) so that files created with open() have the mode that
438 is specified in the open() call. However, there are some files, typically in
439 the spool directory, that are created with fopen(). They end up world-writeable
440 if no precautions are taken. Although the spool directory is not accessible to
441 the world, this is an untidiness. So this is a wrapper function for fopen()
442 that sorts out the mode of the created file.
445 filename the file name
446 options the fopen() options
447 mode the required mode
449 Returns: the fopened FILE or NULL
453 modefopen(const uschar *filename, const char *options, mode_t mode)
455 mode_t saved_umask = umask(0777);
456 FILE *f = Ufopen(filename, options);
457 (void)umask(saved_umask);
458 if (f != NULL) (void)fchmod(fileno(f), mode);
465 /*************************************************
466 * Ensure stdin, stdout, and stderr exist *
467 *************************************************/
469 /* Some operating systems grumble if an exec() happens without a standard
470 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
471 file will be opened and will use these fd values, and then some other bit of
472 code will assume, for example, that it can write error messages to stderr.
473 This function ensures that fds 0, 1, and 2 are open if they do not already
474 exist, by connecting them to /dev/null.
476 This function is also used to ensure that std{in,out,err} exist at all times,
477 so that if any library that Exim calls tries to use them, it doesn't crash.
489 for (i = 0; i <= 2; i++)
491 if (fstat(i, &statbuf) < 0 && errno == EBADF)
493 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
494 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
495 string_open_failed(errno, "/dev/null"));
496 if (devnull != i) (void)dup2(devnull, i);
499 if (devnull > 2) (void)close(devnull);
505 /*************************************************
506 * Close unwanted file descriptors for delivery *
507 *************************************************/
509 /* This function is called from a new process that has been forked to deliver
510 an incoming message, either directly, or using exec.
512 We want any smtp input streams to be closed in this new process. However, it
513 has been observed that using fclose() here causes trouble. When reading in -bS
514 input, duplicate copies of messages have been seen. The files will be sharing a
515 file pointer with the parent process, and it seems that fclose() (at least on
516 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
517 least sometimes. Hence we go for closing the underlying file descriptors.
519 If TLS is active, we want to shut down the TLS library, but without molesting
520 the parent's SSL connection.
522 For delivery of a non-SMTP message, we want to close stdin and stdout (and
523 stderr unless debugging) because the calling process might have set them up as
524 pipes and be waiting for them to close before it waits for the submission
525 process to terminate. If they aren't closed, they hold up the calling process
526 until the initial delivery process finishes, which is not what we want.
528 Exception: We do want it for synchronous delivery!
530 And notwithstanding all the above, if D_resolver is set, implying resolver
531 debugging, leave stdout open, because that's where the resolver writes its
534 When we close stderr (which implies we've also closed stdout), we also get rid
535 of any controlling terminal.
547 tls_close(TRUE, FALSE); /* Shut down the TLS library */
549 (void)close(fileno(smtp_in));
550 (void)close(fileno(smtp_out));
555 (void)close(0); /* stdin */
556 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
557 if (debug_selector == 0) /* stderr */
559 if (!synchronous_delivery)
572 /*************************************************
574 *************************************************/
576 /* This function sets a new uid and gid permanently, optionally calling
577 initgroups() to set auxiliary groups. There are some special cases when running
578 Exim in unprivileged modes. In these situations the effective uid will not be
579 root; if we already have the right effective uid/gid, and don't need to
580 initialize any groups, leave things as they are.
585 igflag TRUE if initgroups() wanted
586 msg text to use in debugging output and failure log
588 Returns: nothing; bombs out on failure
592 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
594 uid_t euid = geteuid();
595 gid_t egid = getegid();
597 if (euid == root_uid || euid != uid || egid != gid || igflag)
599 /* At least one OS returns +1 for initgroups failure, so just check for
604 struct passwd *pw = getpwuid(uid);
607 if (initgroups(pw->pw_name, gid) != 0)
608 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
609 (long int)uid, strerror(errno));
611 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
612 "no passwd entry for uid=%ld", (long int)uid);
615 if (setgid(gid) < 0 || setuid(uid) < 0)
617 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
618 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
622 /* Debugging output included uid/gid and all groups */
626 int group_count, save_errno;
627 gid_t group_list[NGROUPS_MAX];
628 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
629 (long int)geteuid(), (long int)getegid(), (long int)getpid());
630 group_count = getgroups(NGROUPS_MAX, group_list);
632 debug_printf(" auxiliary group list:");
636 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
638 else if (group_count < 0)
639 debug_printf(" <error: %s>", strerror(save_errno));
640 else debug_printf(" <none>");
648 /*************************************************
650 *************************************************/
652 /* Exim exits via this function so that it always clears up any open
658 Returns: does not return
666 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
667 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
674 /*************************************************
675 * Extract port from host address *
676 *************************************************/
678 /* Called to extract the port from the values given to -oMa and -oMi.
679 It also checks the syntax of the address, and terminates it before the
680 port data when a port is extracted.
683 address the address, with possible port on the end
685 Returns: the port, or zero if there isn't one
686 bombs out on a syntax error
690 check_port(uschar *address)
692 int port = host_address_extract_port(address);
693 if (string_is_ip_address(address, NULL) == 0)
695 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
703 /*************************************************
704 * Test/verify an address *
705 *************************************************/
707 /* This function is called by the -bv and -bt code. It extracts a working
708 address from a full RFC 822 address. This isn't really necessary per se, but it
709 has the effect of collapsing source routes.
713 flags flag bits for verify_address()
714 exit_value to be set for failures
720 test_address(uschar *s, int flags, int *exit_value)
722 int start, end, domain;
723 uschar *parse_error = NULL;
724 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
728 fprintf(stdout, "syntax error: %s\n", parse_error);
733 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
734 -1, -1, NULL, NULL, NULL);
735 if (rc == FAIL) *exit_value = 2;
736 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
742 /*************************************************
743 * Show supported features *
744 *************************************************/
746 /* This function is called for -bV/--version and for -d to output the optional
747 features of the current Exim binary.
749 Arguments: a FILE for printing
754 show_whats_supported(FILE *f)
758 #ifdef DB_VERSION_STRING
759 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
760 #elif defined(BTREEVERSION) && defined(HASHVERSION)
762 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
764 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
766 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
767 fprintf(f, "Probably ndbm\n");
768 #elif defined(USE_TDB)
769 fprintf(f, "Using tdb\n");
772 fprintf(f, "Probably GDBM (native mode)\n");
774 fprintf(f, "Probably GDBM (compatibility mode)\n");
778 fprintf(f, "Support for:");
779 #ifdef SUPPORT_CRYPTEQ
780 fprintf(f, " crypteq");
783 fprintf(f, " iconv()");
788 #ifdef HAVE_SETCLASSRESOURCES
789 fprintf(f, " use_setclassresources");
798 fprintf(f, " Expand_dlfunc");
800 #ifdef USE_TCP_WRAPPERS
801 fprintf(f, " TCPwrappers");
805 fprintf(f, " GnuTLS");
807 fprintf(f, " OpenSSL");
810 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
811 fprintf(f, " translate_ip_address");
813 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
814 fprintf(f, " move_frozen_messages");
816 #ifdef WITH_CONTENT_SCAN
817 fprintf(f, " Content_Scanning");
822 #ifndef DISABLE_DNSSEC
823 fprintf(f, " DNSSEC");
825 #ifndef DISABLE_EVENT
826 fprintf(f, " Event");
838 fprintf(f, " PROXY");
841 fprintf(f, " SOCKS");
843 #ifdef EXPERIMENTAL_LMDB
844 fprintf(f, " Experimental_LMDB");
846 #ifdef EXPERIMENTAL_SPF
847 fprintf(f, " Experimental_SPF");
849 #ifdef EXPERIMENTAL_SRS
850 fprintf(f, " Experimental_SRS");
852 #ifdef EXPERIMENTAL_BRIGHTMAIL
853 fprintf(f, " Experimental_Brightmail");
855 #ifdef EXPERIMENTAL_DANE
856 fprintf(f, " Experimental_DANE");
858 #ifdef EXPERIMENTAL_DCC
859 fprintf(f, " Experimental_DCC");
861 #ifdef EXPERIMENTAL_DMARC
862 fprintf(f, " Experimental_DMARC");
864 #ifdef EXPERIMENTAL_DSN_INFO
865 fprintf(f, " Experimental_DSN_info");
869 fprintf(f, "Lookups (built-in):");
870 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
871 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
873 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
876 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
877 fprintf(f, " dbm dbmjz dbmnz");
879 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
880 fprintf(f, " dnsdb");
882 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
883 fprintf(f, " dsearch");
885 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
886 fprintf(f, " ibase");
888 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
889 fprintf(f, " ldap ldapdn ldapm");
891 #ifdef EXPERIMENTAL_LMDB
894 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
895 fprintf(f, " mysql");
897 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
898 fprintf(f, " nis nis0");
900 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
901 fprintf(f, " nisplus");
903 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
904 fprintf(f, " oracle");
906 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
907 fprintf(f, " passwd");
909 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
910 fprintf(f, " pgsql");
912 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
913 fprintf(f, " redis");
915 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
916 fprintf(f, " sqlite");
918 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
919 fprintf(f, " testdb");
921 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
922 fprintf(f, " whoson");
926 fprintf(f, "Authenticators:");
928 fprintf(f, " cram_md5");
930 #ifdef AUTH_CYRUS_SASL
931 fprintf(f, " cyrus_sasl");
934 fprintf(f, " dovecot");
937 fprintf(f, " gsasl");
939 #ifdef AUTH_HEIMDAL_GSSAPI
940 fprintf(f, " heimdal_gssapi");
942 #ifdef AUTH_PLAINTEXT
943 fprintf(f, " plaintext");
953 fprintf(f, "Routers:");
955 fprintf(f, " accept");
957 #ifdef ROUTER_DNSLOOKUP
958 fprintf(f, " dnslookup");
960 #ifdef ROUTER_IPLITERAL
961 fprintf(f, " ipliteral");
963 #ifdef ROUTER_IPLOOKUP
964 fprintf(f, " iplookup");
966 #ifdef ROUTER_MANUALROUTE
967 fprintf(f, " manualroute");
969 #ifdef ROUTER_QUERYPROGRAM
970 fprintf(f, " queryprogram");
972 #ifdef ROUTER_REDIRECT
973 fprintf(f, " redirect");
977 fprintf(f, "Transports:");
978 #ifdef TRANSPORT_APPENDFILE
979 fprintf(f, " appendfile");
980 #ifdef SUPPORT_MAILDIR
981 fprintf(f, "/maildir");
983 #ifdef SUPPORT_MAILSTORE
984 fprintf(f, "/mailstore");
990 #ifdef TRANSPORT_AUTOREPLY
991 fprintf(f, " autoreply");
993 #ifdef TRANSPORT_LMTP
996 #ifdef TRANSPORT_PIPE
999 #ifdef TRANSPORT_SMTP
1000 fprintf(f, " smtp");
1004 if (fixed_never_users[0] > 0)
1007 fprintf(f, "Fixed never_users: ");
1008 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1009 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1010 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1013 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1015 /* Everything else is details which are only worth reporting when debugging.
1016 Perhaps the tls_version_report should move into this too. */
1021 /* clang defines __GNUC__ (at least, for me) so test for it first */
1022 #if defined(__clang__)
1023 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1024 #elif defined(__GNUC__)
1025 fprintf(f, "Compiler: GCC [%s]\n",
1029 "? unknown version ?"
1033 fprintf(f, "Compiler: <unknown>\n");
1037 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1038 __GLIBC__, __GLIBC_MINOR__);
1039 if (__GLIBC_PREREQ(2, 1))
1040 fprintf(f, " Runtime: %s\n",
1041 gnu_get_libc_version());
1045 tls_version_report(f);
1048 utf8_version_report(f);
1051 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1052 if (authi->version_report)
1053 (*authi->version_report)(f);
1055 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1056 characters; unless it's an ancient version of PCRE in which case it
1058 #ifndef PCRE_PRERELEASE
1059 # define PCRE_PRERELEASE
1062 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1063 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1065 PCRE_MAJOR, PCRE_MINOR,
1066 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1069 #undef EXPAND_AND_QUOTE
1072 for (i = 0; i < lookup_list_count; i++)
1073 if (lookup_list[i]->version_report)
1074 lookup_list[i]->version_report(f);
1076 #ifdef WHITELIST_D_MACROS
1077 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1079 fprintf(f, "WHITELIST_D_MACROS unset\n");
1081 #ifdef TRUSTED_CONFIG_LIST
1082 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1084 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1091 /*************************************************
1092 * Show auxiliary information about Exim *
1093 *************************************************/
1096 show_exim_information(enum commandline_info request, FILE *stream)
1103 fprintf(stream, "Oops, something went wrong.\n");
1107 "The -bI: flag takes a string indicating which information to provide.\n"
1108 "If the string is not recognised, you'll get this help (on stderr).\n"
1110 " exim -bI:help this information\n"
1111 " exim -bI:dscp dscp value keywords known\n"
1112 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1116 for (pp = exim_sieve_extension_list; *pp; ++pp)
1117 fprintf(stream, "%s\n", *pp);
1120 dscp_list_to_stream(stream);
1126 /*************************************************
1127 * Quote a local part *
1128 *************************************************/
1130 /* This function is used when a sender address or a From: or Sender: header
1131 line is being created from the caller's login, or from an authenticated_id. It
1132 applies appropriate quoting rules for a local part.
1134 Argument: the local part
1135 Returns: the local part, quoted if necessary
1139 local_part_quote(uschar *lpart)
1141 BOOL needs_quote = FALSE;
1146 for (t = lpart; !needs_quote && *t != 0; t++)
1148 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1149 (*t != '.' || t == lpart || t[1] == 0);
1152 if (!needs_quote) return lpart;
1155 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1159 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1162 yield = string_cat(yield, &size, &ptr, lpart);
1165 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1166 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1167 yield = string_catn(yield, &size, &ptr, nq, 1);
1171 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1179 /*************************************************
1180 * Load readline() functions *
1181 *************************************************/
1183 /* This function is called from testing executions that read data from stdin,
1184 but only when running as the calling user. Currently, only -be does this. The
1185 function loads the readline() function library and passes back the functions.
1186 On some systems, it needs the curses library, so load that too, but try without
1187 it if loading fails. All this functionality has to be requested at build time.
1190 fn_readline_ptr pointer to where to put the readline pointer
1191 fn_addhist_ptr pointer to where to put the addhistory function
1193 Returns: the dlopen handle or NULL on failure
1197 set_readline(char * (**fn_readline_ptr)(const char *),
1198 void (**fn_addhist_ptr)(const char *))
1201 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1203 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1204 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1206 if (dlhandle != NULL)
1208 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1209 * char * readline (const char *prompt);
1210 * void add_history (const char *string);
1212 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1213 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1217 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1226 /*************************************************
1227 * Get a line from stdin for testing things *
1228 *************************************************/
1230 /* This function is called when running tests that can take a number of lines
1231 of input (for example, -be and -bt). It handles continuations and trailing
1232 spaces. And prompting and a blank line output on eof. If readline() is in use,
1233 the arguments are non-NULL and provide the relevant functions.
1236 fn_readline readline function or NULL
1237 fn_addhist addhist function or NULL
1239 Returns: pointer to dynamic memory, or NULL at end of file
1243 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1248 uschar *yield = NULL;
1250 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1254 uschar buffer[1024];
1258 char *readline_line = NULL;
1259 if (fn_readline != NULL)
1261 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1262 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1263 p = US readline_line;
1268 /* readline() not in use */
1271 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1275 /* Handle the line */
1277 ss = p + (int)Ustrlen(p);
1278 while (ss > p && isspace(ss[-1])) ss--;
1282 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1285 yield = string_catn(yield, &size, &ptr, p, ss - p);
1288 if (fn_readline != NULL) free(readline_line);
1291 /* yield can only be NULL if ss==p */
1292 if (ss == p || yield[ptr-1] != '\\')
1294 if (yield) yield[ptr] = 0;
1300 if (yield == NULL) printf("\n");
1306 /*************************************************
1307 * Output usage information for the program *
1308 *************************************************/
1310 /* This function is called when there are no recipients
1311 or a specific --help argument was added.
1314 progname information on what name we were called by
1316 Returns: DOES NOT RETURN
1320 exim_usage(uschar *progname)
1323 /* Handle specific program invocation varients */
1324 if (Ustrcmp(progname, US"-mailq") == 0)
1327 "mailq - list the contents of the mail queue\n\n"
1328 "For a list of options, see the Exim documentation.\n");
1332 /* Generic usage - we output this whatever happens */
1334 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1335 "not directly from a shell command line. Options and/or arguments control\n"
1336 "what it does when called. For a list of options, see the Exim documentation.\n");
1343 /*************************************************
1344 * Validate that the macros given are okay *
1345 *************************************************/
1347 /* Typically, Exim will drop privileges if macros are supplied. In some
1348 cases, we want to not do so.
1350 Arguments: opt_D_used - true if the commandline had a "-D" option
1351 Returns: true if trusted, false otherwise
1355 macros_trusted(BOOL opt_D_used)
1357 #ifdef WHITELIST_D_MACROS
1359 uschar *whitelisted, *end, *p, **whites, **w;
1360 int white_count, i, n;
1362 BOOL prev_char_item, found;
1367 #ifndef WHITELIST_D_MACROS
1371 /* We only trust -D overrides for some invoking users:
1372 root, the exim run-time user, the optional config owner user.
1373 I don't know why config-owner would be needed, but since they can own the
1374 config files anyway, there's no security risk to letting them override -D. */
1375 if ( ! ((real_uid == root_uid)
1376 || (real_uid == exim_uid)
1377 #ifdef CONFIGURE_OWNER
1378 || (real_uid == config_uid)
1382 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1386 /* Get a list of macros which are whitelisted */
1387 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1388 prev_char_item = FALSE;
1390 for (p = whitelisted; *p != '\0'; ++p)
1392 if (*p == ':' || isspace(*p))
1397 prev_char_item = FALSE;
1400 if (!prev_char_item)
1401 prev_char_item = TRUE;
1408 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1409 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1414 if (i == white_count)
1416 while (*p != '\0' && p < end)
1422 /* The list of commandline macros should be very short.
1423 Accept the N*M complexity. */
1424 for (m = macros; m; m = m->next) if (m->command_line)
1427 for (w = whites; *w; ++w)
1428 if (Ustrcmp(*w, m->name) == 0)
1435 if (m->replacement == NULL)
1437 len = Ustrlen(m->replacement);
1440 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1441 0, PCRE_EOPT, NULL, 0);
1444 if (n != PCRE_ERROR_NOMATCH)
1445 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1449 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1455 /*************************************************
1456 * Entry point and high-level code *
1457 *************************************************/
1459 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1460 the appropriate action. All the necessary functions are present in the one
1461 binary. I originally thought one should split it up, but it turns out that so
1462 much of the apparatus is needed in each chunk that one might as well just have
1463 it all available all the time, which then makes the coding easier as well.
1466 argc count of entries in argv
1467 argv argument strings, with argv[0] being the program name
1469 Returns: EXIT_SUCCESS if terminated successfully
1470 EXIT_FAILURE otherwise, except when a message has been sent
1471 to the sender, and -oee was given
1475 main(int argc, char **cargv)
1477 uschar **argv = USS cargv;
1478 int arg_receive_timeout = -1;
1479 int arg_smtp_receive_timeout = -1;
1480 int arg_error_handling = error_handling;
1481 int filter_sfd = -1;
1482 int filter_ufd = -1;
1485 int list_queue_option = 0;
1487 int msg_action_arg = -1;
1488 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1489 int queue_only_reason = 0;
1491 int perl_start_option = 0;
1493 int recipients_arg = argc;
1494 int sender_address_domain = 0;
1495 int test_retry_arg = -1;
1496 int test_rewrite_arg = -1;
1497 BOOL arg_queue_only = FALSE;
1498 BOOL bi_option = FALSE;
1499 BOOL checking = FALSE;
1500 BOOL count_queue = FALSE;
1501 BOOL expansion_test = FALSE;
1502 BOOL extract_recipients = FALSE;
1503 BOOL flag_G = FALSE;
1504 BOOL flag_n = FALSE;
1505 BOOL forced_delivery = FALSE;
1506 BOOL f_end_dot = FALSE;
1507 BOOL deliver_give_up = FALSE;
1508 BOOL list_queue = FALSE;
1509 BOOL list_options = FALSE;
1510 BOOL list_config = FALSE;
1511 BOOL local_queue_only;
1513 BOOL one_msg_action = FALSE;
1514 BOOL opt_D_used = 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 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1658 fprintf(stderr, "exim: failed to get store for log buffer\n");
1662 /* Initialize the default log options. */
1664 bits_set(log_selector, log_selector_size, log_default);
1666 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1667 NULL when the daemon is run and the file is closed. We have to use this
1668 indirection, because some systems don't allow writing to the variable "stderr".
1671 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1673 /* Arrange for the PCRE regex library to use our store functions. Note that
1674 the normal calls are actually macros that add additional arguments for
1675 debugging purposes so we have to assign specially constructed functions here.
1676 The default is to use store in the stacking pool, but this is overridden in the
1677 regex_must_compile() function. */
1679 pcre_malloc = function_store_get;
1680 pcre_free = function_dummy_free;
1682 /* Ensure there is a big buffer for temporary use in several places. It is put
1683 in malloc store so that it can be freed for enlargement if necessary. */
1685 big_buffer = store_malloc(big_buffer_size);
1687 /* Set up the handler for the data request signal, and set the initial
1688 descriptive text. */
1690 set_process_info("initializing");
1691 readconf_features();
1693 os_restarting_signal(SIGUSR1, usr1_handler);
1695 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1696 in the daemon code. For the rest of Exim's uses, we ignore it. */
1698 signal(SIGHUP, SIG_IGN);
1700 /* We don't want to die on pipe errors as the code is written to handle
1701 the write error instead. */
1703 signal(SIGPIPE, SIG_IGN);
1705 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1706 set to SIG_IGN. This causes subprocesses that complete before the parent
1707 process waits for them not to hang around, so when Exim calls wait(), nothing
1708 is there. The wait() code has been made robust against this, but let's ensure
1709 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1710 ending status. We use sigaction rather than plain signal() on those OS where
1711 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1712 problem on AIX with this.) */
1716 struct sigaction act;
1717 act.sa_handler = SIG_DFL;
1718 sigemptyset(&(act.sa_mask));
1720 sigaction(SIGCHLD, &act, NULL);
1723 signal(SIGCHLD, SIG_DFL);
1726 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1731 /* Set up the version number. Set up the leading 'E' for the external form of
1732 message ids, set the pointer to the internal form, and initialize it to
1733 indicate no message being processed. */
1736 message_id_option[0] = '-';
1737 message_id_external = message_id_option + 1;
1738 message_id_external[0] = 'E';
1739 message_id = message_id_external + 1;
1742 /* Set the umask to zero so that any files Exim creates using open() are
1743 created with the modes that it specifies. NOTE: Files created with fopen() have
1744 a problem, which was not recognized till rather late (February 2006). With this
1745 umask, such files will be world writeable. (They are all content scanning files
1746 in the spool directory, which isn't world-accessible, so this is not a
1747 disaster, but it's untidy.) I don't want to change this overall setting,
1748 however, because it will interact badly with the open() calls. Instead, there's
1749 now a function called modefopen() that fiddles with the umask while calling
1754 /* Precompile the regular expression for matching a message id. Keep this in
1755 step with the code that generates ids in the accept.c module. We need to do
1756 this here, because the -M options check their arguments for syntactic validity
1757 using mac_ismsgid, which uses this. */
1760 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1762 /* Precompile the regular expression that is used for matching an SMTP error
1763 code, possibly extended, at the start of an error message. Note that the
1764 terminating whitespace character is included. */
1767 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1770 #ifdef WHITELIST_D_MACROS
1771 /* Precompile the regular expression used to filter the content of macros
1772 given to -D for permissibility. */
1774 regex_whitelisted_macro =
1775 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1778 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1780 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1781 this seems to be a generally accepted convention, since one finds symbolic
1782 links called "mailq" in standard OS configurations. */
1784 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1785 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1788 receiving_message = FALSE;
1789 called_as = US"-mailq";
1792 /* If the program is called as "rmail" treat it as equivalent to
1793 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1794 i.e. preventing a single dot on a line from terminating the message, and
1795 returning with zero return code, even in cases of error (provided an error
1796 message has been sent). */
1798 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1799 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1802 called_as = US"-rmail";
1803 errors_sender_rc = EXIT_SUCCESS;
1806 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1807 this is a smail convention. */
1809 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1810 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1812 smtp_input = smtp_batched_input = TRUE;
1813 called_as = US"-rsmtp";
1816 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1817 this is a smail convention. */
1819 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1820 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1823 receiving_message = FALSE;
1824 called_as = US"-runq";
1827 /* If the program is called as "newaliases" treat it as equivalent to
1828 "exim -bi"; this is a sendmail convention. */
1830 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1831 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1834 receiving_message = FALSE;
1835 called_as = US"-newaliases";
1838 /* Save the original effective uid for a couple of uses later. It should
1839 normally be root, but in some esoteric environments it may not be. */
1841 original_euid = geteuid();
1843 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1844 to be the same as the real ones. This makes a difference only if Exim is setuid
1845 (or setgid) to something other than root, which could be the case in some
1846 special configurations. */
1848 real_uid = getuid();
1849 real_gid = getgid();
1851 if (real_uid == root_uid)
1853 rv = setgid(real_gid);
1856 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1857 (long int)real_gid, strerror(errno));
1860 rv = setuid(real_uid);
1863 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1864 (long int)real_uid, strerror(errno));
1869 /* If neither the original real uid nor the original euid was root, Exim is
1870 running in an unprivileged state. */
1872 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1874 /* Scan the program's arguments. Some can be dealt with right away; others are
1875 simply recorded for checking and handling afterwards. Do a high-level switch
1876 on the second character (the one after '-'), to save some effort. */
1878 for (i = 1; i < argc; i++)
1880 BOOL badarg = FALSE;
1881 uschar *arg = argv[i];
1885 /* An argument not starting with '-' is the start of a recipients list;
1886 break out of the options-scanning loop. */
1894 /* An option consistion of -- terminates the options */
1896 if (Ustrcmp(arg, "--") == 0)
1898 recipients_arg = i + 1;
1902 /* Handle flagged options */
1904 switchchar = arg[1];
1907 /* Make all -ex options synonymous with -oex arguments, since that
1908 is assumed by various callers. Also make -qR options synonymous with -R
1909 options, as that seems to be required as well. Allow for -qqR too, and
1910 the same for -S options. */
1912 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1913 Ustrncmp(arg+1, "qR", 2) == 0 ||
1914 Ustrncmp(arg+1, "qS", 2) == 0)
1916 switchchar = arg[2];
1919 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1921 switchchar = arg[3];
1923 queue_2stage = TRUE;
1926 /* Make -r synonymous with -f, since it is a documented alias */
1928 else if (arg[1] == 'r') switchchar = 'f';
1930 /* Make -ov synonymous with -v */
1932 else if (Ustrcmp(arg, "-ov") == 0)
1938 /* deal with --option_aliases */
1939 else if (switchchar == '-')
1941 if (Ustrcmp(argrest, "help") == 0)
1943 usage_wanted = TRUE;
1946 else if (Ustrcmp(argrest, "version") == 0)
1953 /* High-level switch on active initial letter */
1958 /* sendmail uses -Ac and -Am to control which .cf file is used;
1961 if (*argrest == '\0') { badarg = TRUE; break; }
1964 BOOL ignore = FALSE;
1969 if (*(argrest + 1) == '\0')
1973 if (!ignore) { badarg = TRUE; break; }
1977 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1978 so has no need of it. */
1981 if (*argrest == 0) i++; /* Skip over the type */
1986 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1988 /* -bd: Run in daemon mode, awaiting SMTP connections.
1989 -bdf: Ditto, but in the foreground.
1992 if (*argrest == 'd')
1994 daemon_listen = TRUE;
1995 if (*(++argrest) == 'f') background_daemon = FALSE;
1996 else if (*argrest != 0) { badarg = TRUE; break; }
1999 /* -be: Run in expansion test mode
2000 -bem: Ditto, but read a message from a file first
2003 else if (*argrest == 'e')
2005 expansion_test = checking = TRUE;
2006 if (argrest[1] == 'm')
2008 if (++i >= argc) { badarg = TRUE; break; }
2009 expansion_test_message = argv[i];
2012 if (argrest[1] != 0) { badarg = TRUE; break; }
2015 /* -bF: Run system filter test */
2017 else if (*argrest == 'F')
2019 filter_test |= checking = FTEST_SYSTEM;
2020 if (*(++argrest) != 0) { badarg = TRUE; break; }
2021 if (++i < argc) filter_test_sfile = argv[i]; else
2023 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2028 /* -bf: Run user filter test
2029 -bfd: Set domain for filter testing
2030 -bfl: Set local part for filter testing
2031 -bfp: Set prefix for filter testing
2032 -bfs: Set suffix for filter testing
2035 else if (*argrest == 'f')
2037 if (*(++argrest) == 0)
2039 filter_test |= checking = FTEST_USER;
2040 if (++i < argc) filter_test_ufile = argv[i]; else
2042 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2050 fprintf(stderr, "exim: string expected after %s\n", arg);
2053 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2054 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2055 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2056 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2057 else { badarg = TRUE; break; }
2061 /* -bh: Host checking - an IP address must follow. */
2063 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2065 if (++i >= argc) { badarg = TRUE; break; }
2066 sender_host_address = argv[i];
2067 host_checking = checking = log_testing_mode = TRUE;
2068 host_checking_callout = argrest[1] == 'c';
2069 message_logs = FALSE;
2072 /* -bi: This option is used by sendmail to initialize *the* alias file,
2073 though it has the -oA option to specify a different file. Exim has no
2074 concept of *the* alias file, but since Sun's YP make script calls
2075 sendmail this way, some support must be provided. */
2077 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2079 /* -bI: provide information, of the type to follow after a colon.
2080 This is an Exim flag. */
2082 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2084 uschar *p = &argrest[2];
2085 info_flag = CMDINFO_HELP;
2088 if (strcmpic(p, CUS"sieve") == 0)
2090 info_flag = CMDINFO_SIEVE;
2093 else if (strcmpic(p, CUS"dscp") == 0)
2095 info_flag = CMDINFO_DSCP;
2098 else if (strcmpic(p, CUS"help") == 0)
2105 /* -bm: Accept and deliver message - the default option. Reinstate
2106 receiving_message, which got turned off for all -b options. */
2108 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2110 /* -bmalware: test the filename given for malware */
2112 else if (Ustrcmp(argrest, "malware") == 0)
2114 if (++i >= argc) { badarg = TRUE; break; }
2116 malware_test_file = argv[i];
2119 /* -bnq: For locally originating messages, do not qualify unqualified
2120 addresses. In the envelope, this causes errors; in header lines they
2123 else if (Ustrcmp(argrest, "nq") == 0)
2125 allow_unqualified_sender = FALSE;
2126 allow_unqualified_recipient = FALSE;
2129 /* -bpxx: List the contents of the mail queue, in various forms. If
2130 the option is -bpc, just a queue count is needed. Otherwise, if the
2131 first letter after p is r, then order is random. */
2133 else if (*argrest == 'p')
2135 if (*(++argrest) == 'c')
2138 if (*(++argrest) != 0) badarg = TRUE;
2142 if (*argrest == 'r')
2144 list_queue_option = 8;
2147 else list_queue_option = 0;
2151 /* -bp: List the contents of the mail queue, top-level only */
2153 if (*argrest == 0) {}
2155 /* -bpu: List the contents of the mail queue, top-level undelivered */
2157 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2159 /* -bpa: List the contents of the mail queue, including all delivered */
2161 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2163 /* Unknown after -bp[r] */
2173 /* -bP: List the configuration variables given as the address list.
2174 Force -v, so configuration errors get displayed. */
2176 else if (Ustrcmp(argrest, "P") == 0)
2178 /* -bP config: we need to setup here, because later,
2179 * when list_options is checked, the config is read already */
2180 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2183 readconf_save_config(version_string);
2187 list_options = TRUE;
2188 debug_selector |= D_v;
2189 debug_file = stderr;
2193 /* -brt: Test retry configuration lookup */
2195 else if (Ustrcmp(argrest, "rt") == 0)
2198 test_retry_arg = i + 1;
2202 /* -brw: Test rewrite configuration */
2204 else if (Ustrcmp(argrest, "rw") == 0)
2207 test_rewrite_arg = i + 1;
2211 /* -bS: Read SMTP commands on standard input, but produce no replies -
2212 all errors are reported by sending messages. */
2214 else if (Ustrcmp(argrest, "S") == 0)
2215 smtp_input = smtp_batched_input = receiving_message = TRUE;
2217 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2218 on standard output. */
2220 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2222 /* -bt: address testing mode */
2224 else if (Ustrcmp(argrest, "t") == 0)
2225 address_test_mode = checking = log_testing_mode = TRUE;
2227 /* -bv: verify addresses */
2229 else if (Ustrcmp(argrest, "v") == 0)
2230 verify_address_mode = checking = log_testing_mode = TRUE;
2232 /* -bvs: verify sender addresses */
2234 else if (Ustrcmp(argrest, "vs") == 0)
2236 verify_address_mode = checking = log_testing_mode = TRUE;
2237 verify_as_sender = TRUE;
2240 /* -bV: Print version string and support details */
2242 else if (Ustrcmp(argrest, "V") == 0)
2244 printf("Exim version %s #%s built %s\n", version_string,
2245 version_cnumber, version_date);
2246 printf("%s\n", CS version_copyright);
2247 version_printed = TRUE;
2248 show_whats_supported(stdout);
2249 log_testing_mode = TRUE;
2252 /* -bw: inetd wait mode, accept a listening socket as stdin */
2254 else if (*argrest == 'w')
2256 inetd_wait_mode = TRUE;
2257 background_daemon = FALSE;
2258 daemon_listen = TRUE;
2259 if (*(++argrest) != '\0')
2261 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2262 if (inetd_wait_timeout <= 0)
2264 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2274 /* -C: change configuration file list; ignore if it isn't really
2275 a change! Enforce a prefix check if required. */
2280 if(++i < argc) argrest = argv[i]; else
2281 { badarg = TRUE; break; }
2283 if (Ustrcmp(config_main_filelist, argrest) != 0)
2285 #ifdef ALT_CONFIG_PREFIX
2287 int len = Ustrlen(ALT_CONFIG_PREFIX);
2288 uschar *list = argrest;
2290 while((filename = string_nextinlist(&list, &sep, big_buffer,
2291 big_buffer_size)) != NULL)
2293 if ((Ustrlen(filename) < len ||
2294 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2295 Ustrstr(filename, "/../") != NULL) &&
2296 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2298 fprintf(stderr, "-C Permission denied\n");
2303 if (real_uid != root_uid)
2305 #ifdef TRUSTED_CONFIG_LIST
2307 if (real_uid != exim_uid
2308 #ifdef CONFIGURE_OWNER
2309 && real_uid != config_uid
2312 trusted_config = FALSE;
2315 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2318 struct stat statbuf;
2320 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2321 (statbuf.st_uid != root_uid /* owner not root */
2322 #ifdef CONFIGURE_OWNER
2323 && statbuf.st_uid != config_uid /* owner not the special one */
2326 (statbuf.st_gid != root_gid /* group not root */
2327 #ifdef CONFIGURE_GROUP
2328 && statbuf.st_gid != config_gid /* group not the special one */
2330 && (statbuf.st_mode & 020) != 0 /* group writeable */
2332 (statbuf.st_mode & 2) != 0) /* world writeable */
2334 trusted_config = FALSE;
2339 /* Well, the trust list at least is up to scratch... */
2340 void *reset_point = store_get(0);
2341 uschar *trusted_configs[32];
2345 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2347 uschar *start = big_buffer, *nl;
2348 while (*start && isspace(*start))
2352 nl = Ustrchr(start, '\n');
2355 trusted_configs[nr_configs++] = string_copy(start);
2356 if (nr_configs == 32)
2364 const uschar *list = argrest;
2366 while (trusted_config && (filename = string_nextinlist(&list,
2367 &sep, big_buffer, big_buffer_size)) != NULL)
2369 for (i=0; i < nr_configs; i++)
2371 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2374 if (i == nr_configs)
2376 trusted_config = FALSE;
2380 store_reset(reset_point);
2384 /* No valid prefixes found in trust_list file. */
2385 trusted_config = FALSE;
2391 /* Could not open trust_list file. */
2392 trusted_config = FALSE;
2396 /* Not root; don't trust config */
2397 trusted_config = FALSE;
2401 config_main_filelist = argrest;
2402 config_changed = TRUE;
2407 /* -D: set up a macro definition */
2410 #ifdef DISABLE_D_OPTION
2411 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2418 uschar *s = argrest;
2421 while (isspace(*s)) s++;
2423 if (*s < 'A' || *s > 'Z')
2425 fprintf(stderr, "exim: macro name set by -D must start with "
2426 "an upper case letter\n");
2430 while (isalnum(*s) || *s == '_')
2432 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2436 if (ptr == 0) { badarg = TRUE; break; }
2437 while (isspace(*s)) s++;
2440 if (*s++ != '=') { badarg = TRUE; break; }
2441 while (isspace(*s)) s++;
2444 for (m = macros; m; m = m->next)
2445 if (Ustrcmp(m->name, name) == 0)
2447 fprintf(stderr, "exim: duplicated -D in command line\n");
2451 m = macro_create(name, s, TRUE);
2453 if (clmacro_count >= MAX_CLMACROS)
2455 fprintf(stderr, "exim: too many -D options on command line\n");
2458 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2464 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2465 The latter is now a no-op, retained for compatibility only. If -dd is used,
2466 debugging subprocesses of the daemon is disabled. */
2469 if (Ustrcmp(argrest, "ropcr") == 0)
2471 /* drop_cr = TRUE; */
2474 /* Use an intermediate variable so that we don't set debugging while
2475 decoding the debugging bits. */
2479 unsigned int selector = D_default;
2482 if (*argrest == 'd')
2484 debug_daemon = TRUE;
2488 decode_bits(&selector, 1, debug_notall, argrest,
2489 debug_options, debug_options_count, US"debug", 0);
2490 debug_selector = selector;
2495 /* -E: This is a local error message. This option is not intended for
2496 external use at all, but is not restricted to trusted callers because it
2497 does no harm (just suppresses certain error messages) and if Exim is run
2498 not setuid root it won't always be trusted when it generates error
2499 messages using this option. If there is a message id following -E, point
2500 message_reference at it, for logging. */
2503 local_error_message = TRUE;
2504 if (mac_ismsgid(argrest)) message_reference = argrest;
2508 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2509 option, so it looks as if historically the -oex options are also callable
2510 without the leading -o. So we have to accept them. Before the switch,
2511 anything starting -oe has been converted to -e. Exim does not support all
2512 of the sendmail error options. */
2515 if (Ustrcmp(argrest, "e") == 0)
2517 arg_error_handling = ERRORS_SENDER;
2518 errors_sender_rc = EXIT_SUCCESS;
2520 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2521 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2522 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2523 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2528 /* -F: Set sender's full name, used instead of the gecos entry from
2529 the password file. Since users can usually alter their gecos entries,
2530 there's no security involved in using this instead. The data can follow
2531 the -F or be in the next argument. */
2536 if(++i < argc) argrest = argv[i]; else
2537 { badarg = TRUE; break; }
2539 originator_name = argrest;
2540 sender_name_forced = TRUE;
2544 /* -f: Set sender's address - this value is only actually used if Exim is
2545 run by a trusted user, or if untrusted_set_sender is set and matches the
2546 address, except that the null address can always be set by any user. The
2547 test for this happens later, when the value given here is ignored when not
2548 permitted. For an untrusted user, the actual sender is still put in Sender:
2549 if it doesn't match the From: header (unless no_local_from_check is set).
2550 The data can follow the -f or be in the next argument. The -r switch is an
2551 obsolete form of -f but since there appear to be programs out there that
2552 use anything that sendmail has ever supported, better accept it - the
2553 synonymizing is done before the switch above.
2555 At this stage, we must allow domain literal addresses, because we don't
2556 know what the setting of allow_domain_literals is yet. Ditto for trailing
2557 dots and strip_trailing_dot. */
2561 int dummy_start, dummy_end;
2565 if (i+1 < argc) argrest = argv[++i]; else
2566 { badarg = TRUE; break; }
2569 sender_address = string_sprintf(""); /* Ensure writeable memory */
2572 uschar *temp = argrest + Ustrlen(argrest) - 1;
2573 while (temp >= argrest && isspace(*temp)) temp--;
2574 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2575 allow_domain_literals = TRUE;
2576 strip_trailing_dot = TRUE;
2578 allow_utf8_domains = TRUE;
2580 sender_address = parse_extract_address(argrest, &errmess,
2581 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2583 message_smtputf8 = string_is_utf8(sender_address);
2584 allow_utf8_domains = FALSE;
2586 allow_domain_literals = FALSE;
2587 strip_trailing_dot = FALSE;
2588 if (sender_address == NULL)
2590 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2591 return EXIT_FAILURE;
2594 sender_address_forced = TRUE;
2598 /* -G: sendmail invocation to specify that it's a gateway submission and
2599 sendmail may complain about problems instead of fixing them.
2600 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2601 not at this time complain about problems. */
2607 /* -h: Set the hop count for an incoming message. Exim does not currently
2608 support this; it always computes it by counting the Received: headers.
2609 To put it in will require a change to the spool header file format. */
2614 if(++i < argc) argrest = argv[i]; else
2615 { badarg = TRUE; break; }
2617 if (!isdigit(*argrest)) badarg = TRUE;
2621 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2622 not to be documented for sendmail but mailx (at least) uses it) */
2625 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2629 /* -L: set the identifier used for syslog; equivalent to setting
2630 syslog_processname in the config file, but needs to be an admin option. */
2633 if (*argrest == '\0')
2635 if(++i < argc) argrest = argv[i]; else
2636 { badarg = TRUE; break; }
2638 sz = Ustrlen(argrest);
2641 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2642 return EXIT_FAILURE;
2646 fprintf(stderr, "exim: the -L syslog name is too short\n");
2647 return EXIT_FAILURE;
2649 cmdline_syslog_name = argrest;
2653 receiving_message = FALSE;
2655 /* -MC: continue delivery of another message via an existing open
2656 file descriptor. This option is used for an internal call by the
2657 smtp transport when there is a pending message waiting to go to an
2658 address to which it has got a connection. Five subsequent arguments are
2659 required: transport name, host name, IP address, sequence number, and
2660 message_id. Transports may decline to create new processes if the sequence
2661 number gets too big. The channel is stdin. This (-MC) must be the last
2662 argument. There's a subsequent check that the real-uid is privileged.
2664 If we are running in the test harness. delay for a bit, to let the process
2665 that set this one up complete. This makes for repeatability of the logging,
2668 if (Ustrcmp(argrest, "C") == 0)
2670 union sockaddr_46 interface_sock;
2671 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2675 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2676 return EXIT_FAILURE;
2679 if (msg_action_arg >= 0)
2681 fprintf(stderr, "exim: incompatible arguments\n");
2682 return EXIT_FAILURE;
2685 continue_transport = argv[++i];
2686 continue_hostname = argv[++i];
2687 continue_host_address = argv[++i];
2688 continue_sequence = Uatoi(argv[++i]);
2689 msg_action = MSG_DELIVER;
2690 msg_action_arg = ++i;
2691 forced_delivery = TRUE;
2692 queue_run_pid = passed_qr_pid;
2693 queue_run_pipe = passed_qr_pipe;
2695 if (!mac_ismsgid(argv[i]))
2697 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2699 return EXIT_FAILURE;
2702 /* Set up $sending_ip_address and $sending_port */
2704 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2706 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2710 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2712 return EXIT_FAILURE;
2715 if (running_in_test_harness) millisleep(500);
2719 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2723 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2724 precedes -MC (see above). The flag indicates that the host to which
2725 Exim is connected has accepted an AUTH sequence. */
2727 case 'A': smtp_authenticated = TRUE; break;
2729 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2730 that exim is connected to supports the esmtp extension DSN */
2732 case 'D': smtp_peer_options |= PEER_OFFERED_DSN; break;
2734 /* -MCG: set the queue name, to a non-default value */
2736 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2740 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2742 case 'K': smtp_peer_options |= PEER_OFFERED_CHUNKING; break;
2744 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2745 it preceded -MC (see above) */
2747 case 'P': smtp_peer_options |= PEER_OFFERED_PIPE; break;
2749 /* -MCQ: pass on the pid of the queue-running process that started
2750 this chain of deliveries and the fd of its synchronizing pipe; this
2751 is useful only when it precedes -MC (see above) */
2753 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2755 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2759 /* -MCS: set the smtp_use_size flag; this is useful only when it
2760 precedes -MC (see above) */
2762 case 'S': smtp_peer_options |= PEER_OFFERED_SIZE; break;
2765 /* -MCT: set the tls_offered flag; this is useful only when it
2766 precedes -MC (see above). The flag indicates that the host to which
2767 Exim is connected has offered TLS support. */
2769 case 'T': smtp_peer_options |= PEER_OFFERED_TLS; break;
2772 default: badarg = TRUE; break;
2777 /* -M[x]: various operations on the following list of message ids:
2778 -M deliver the messages, ignoring next retry times and thawing
2779 -Mc deliver the messages, checking next retry times, no thawing
2780 -Mf freeze the messages
2781 -Mg give up on the messages
2782 -Mt thaw the messages
2783 -Mrm remove the messages
2784 In the above cases, this must be the last option. There are also the
2785 following options which are followed by a single message id, and which
2786 act on that message. Some of them use the "recipient" addresses as well.
2787 -Mar add recipient(s)
2788 -Mmad mark all recipients delivered
2789 -Mmd mark recipients(s) delivered
2791 -Mset load a message for use with -be
2793 -Mvc show copy (of whole message, in RFC 2822 format)
2798 else if (*argrest == 0)
2800 msg_action = MSG_DELIVER;
2801 forced_delivery = deliver_force_thaw = TRUE;
2803 else if (Ustrcmp(argrest, "ar") == 0)
2805 msg_action = MSG_ADD_RECIPIENT;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2809 else if (Ustrcmp(argrest, "es") == 0)
2811 msg_action = MSG_EDIT_SENDER;
2812 one_msg_action = TRUE;
2814 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2815 else if (Ustrcmp(argrest, "g") == 0)
2817 msg_action = MSG_DELIVER;
2818 deliver_give_up = TRUE;
2820 else if (Ustrcmp(argrest, "mad") == 0)
2822 msg_action = MSG_MARK_ALL_DELIVERED;
2824 else if (Ustrcmp(argrest, "md") == 0)
2826 msg_action = MSG_MARK_DELIVERED;
2827 one_msg_action = TRUE;
2829 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2830 else if (Ustrcmp(argrest, "set") == 0)
2832 msg_action = MSG_LOAD;
2833 one_msg_action = TRUE;
2835 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2836 else if (Ustrcmp(argrest, "vb") == 0)
2838 msg_action = MSG_SHOW_BODY;
2839 one_msg_action = TRUE;
2841 else if (Ustrcmp(argrest, "vc") == 0)
2843 msg_action = MSG_SHOW_COPY;
2844 one_msg_action = TRUE;
2846 else if (Ustrcmp(argrest, "vh") == 0)
2848 msg_action = MSG_SHOW_HEADER;
2849 one_msg_action = TRUE;
2851 else if (Ustrcmp(argrest, "vl") == 0)
2853 msg_action = MSG_SHOW_LOG;
2854 one_msg_action = TRUE;
2856 else { badarg = TRUE; break; }
2858 /* All the -Mxx options require at least one message id. */
2860 msg_action_arg = i + 1;
2861 if (msg_action_arg >= argc)
2863 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2864 return EXIT_FAILURE;
2867 /* Some require only message ids to follow */
2869 if (!one_msg_action)
2872 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2874 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2876 return EXIT_FAILURE;
2878 goto END_ARG; /* Remaining args are ids */
2881 /* Others require only one message id, possibly followed by addresses,
2882 which will be handled as normal arguments. */
2886 if (!mac_ismsgid(argv[msg_action_arg]))
2888 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2889 argv[msg_action_arg], arg);
2890 return EXIT_FAILURE;
2897 /* Some programs seem to call the -om option without the leading o;
2898 for sendmail it askes for "me too". Exim always does this. */
2901 if (*argrest != 0) badarg = TRUE;
2905 /* -N: don't do delivery - a debugging option that stops transports doing
2906 their thing. It implies debugging at the D_v level. */
2911 dont_deliver = TRUE;
2912 debug_selector |= D_v;
2913 debug_file = stderr;
2919 /* -n: This means "don't alias" in sendmail, apparently.
2920 For normal invocations, it has no effect.
2921 It may affect some other options. */
2927 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2928 option to the specified value. This form uses long names. We need to handle
2929 -O option=value and -Ooption=value. */
2936 fprintf(stderr, "exim: string expected after -O\n");
2944 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2947 if (*argrest == 'A')
2949 alias_arg = argrest + 1;
2950 if (alias_arg[0] == 0)
2952 if (i+1 < argc) alias_arg = argv[++i]; else
2954 fprintf(stderr, "exim: string expected after -oA\n");
2960 /* -oB: Set a connection message max value for remote deliveries */
2962 else if (*argrest == 'B')
2964 uschar *p = argrest + 1;
2967 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2969 connection_max_messages = 1;
2978 fprintf(stderr, "exim: number expected after -oB\n");
2981 connection_max_messages = Uatoi(p);
2985 /* -odb: background delivery */
2987 else if (Ustrcmp(argrest, "db") == 0)
2989 synchronous_delivery = FALSE;
2990 arg_queue_only = FALSE;
2991 queue_only_set = TRUE;
2994 /* -odf: foreground delivery (smail-compatible option); same effect as
2995 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2998 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3000 synchronous_delivery = TRUE;
3001 arg_queue_only = FALSE;
3002 queue_only_set = TRUE;
3005 /* -odq: queue only */
3007 else if (Ustrcmp(argrest, "dq") == 0)
3009 synchronous_delivery = FALSE;
3010 arg_queue_only = TRUE;
3011 queue_only_set = TRUE;
3014 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3015 but no remote delivery */
3017 else if (Ustrcmp(argrest, "dqs") == 0)
3020 arg_queue_only = FALSE;
3021 queue_only_set = TRUE;
3024 /* -oex: Sendmail error flags. As these are also accepted without the
3025 leading -o prefix, for compatibility with vacation and other callers,
3026 they are handled with -e above. */
3028 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3029 -oitrue: Another sendmail syntax for the same */
3031 else if (Ustrcmp(argrest, "i") == 0 ||
3032 Ustrcmp(argrest, "itrue") == 0)
3035 /* -oM*: Set various characteristics for an incoming message; actually
3036 acted on for trusted callers only. */
3038 else if (*argrest == 'M')
3042 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3046 /* -oMa: Set sender host address */
3048 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3050 /* -oMaa: Set authenticator name */
3052 else if (Ustrcmp(argrest, "Maa") == 0)
3053 sender_host_authenticated = argv[++i];
3055 /* -oMas: setting authenticated sender */
3057 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3059 /* -oMai: setting authenticated id */
3061 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3063 /* -oMi: Set incoming interface address */
3065 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3067 /* -oMm: Message reference */
3069 else if (Ustrcmp(argrest, "Mm") == 0)
3071 if (!mac_ismsgid(argv[i+1]))
3073 fprintf(stderr,"-oMm must be a valid message ID\n");
3076 if (!trusted_config)
3078 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3081 message_reference = argv[++i];
3084 /* -oMr: Received protocol */
3086 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3088 /* -oMs: Set sender host name */
3090 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3092 /* -oMt: Set sender ident */
3094 else if (Ustrcmp(argrest, "Mt") == 0)
3096 sender_ident_set = TRUE;
3097 sender_ident = argv[++i];
3100 /* Else a bad argument */
3109 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3110 seem to call this as -m (undocumented), so that is also accepted (see
3113 else if (Ustrcmp(argrest, "m") == 0) {}
3115 /* -oo: An ancient flag for old-style addresses which still seems to
3116 crop up in some calls (see in SCO). */
3118 else if (Ustrcmp(argrest, "o") == 0) {}
3120 /* -oP <name>: set pid file path for daemon */
3122 else if (Ustrcmp(argrest, "P") == 0)
3123 override_pid_file_path = argv[++i];
3125 /* -or <n>: set timeout for non-SMTP acceptance
3126 -os <n>: set timeout for SMTP acceptance */
3128 else if (*argrest == 'r' || *argrest == 's')
3130 int *tp = (*argrest == 'r')?
3131 &arg_receive_timeout : &arg_smtp_receive_timeout;
3132 if (argrest[1] == 0)
3134 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3136 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3139 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3144 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3146 else if (Ustrcmp(argrest, "X") == 0)
3147 override_local_interfaces = argv[++i];
3149 /* Unknown -o argument */
3155 /* -ps: force Perl startup; -pd force delayed Perl startup */
3159 if (*argrest == 's' && argrest[1] == 0)
3161 perl_start_option = 1;
3164 if (*argrest == 'd' && argrest[1] == 0)
3166 perl_start_option = -1;
3171 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3172 which sets the host protocol and host name */
3176 if (i+1 < argc) argrest = argv[++i]; else
3177 { badarg = TRUE; break; }
3182 uschar *hn = Ustrchr(argrest, ':');
3185 received_protocol = argrest;
3189 received_protocol = string_copyn(argrest, hn - argrest);
3190 sender_host_name = hn + 1;
3197 receiving_message = FALSE;
3198 if (queue_interval >= 0)
3200 fprintf(stderr, "exim: -q specified more than once\n");
3204 /* -qq...: Do queue runs in a 2-stage manner */
3206 if (*argrest == 'q')
3208 queue_2stage = TRUE;
3212 /* -qi...: Do only first (initial) deliveries */
3214 if (*argrest == 'i')
3216 queue_run_first_delivery = TRUE;
3220 /* -qf...: Run the queue, forcing deliveries
3221 -qff..: Ditto, forcing thawing as well */
3223 if (*argrest == 'f')
3225 queue_run_force = TRUE;
3226 if (*++argrest == 'f')
3228 deliver_force_thaw = TRUE;
3233 /* -q[f][f]l...: Run the queue only on local deliveries */
3235 if (*argrest == 'l')
3237 queue_run_local = TRUE;
3241 /* -q[f][f][l][G<name>]... Work on the named queue */
3243 if (*argrest == 'G')
3246 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3247 queue_name = string_copyn(argrest, i);
3249 if (*argrest == '/') argrest++;
3252 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3253 only, optionally named, optionally starting from a given message id. */
3255 if (*argrest == 0 &&
3256 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3259 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3260 start_queue_run_id = argv[++i];
3261 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3262 stop_queue_run_id = argv[++i];
3265 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3266 forced, optionally local only, optionally named. */
3268 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3271 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3277 case 'R': /* Synonymous with -qR... */
3278 receiving_message = FALSE;
3280 /* -Rf: As -R (below) but force all deliveries,
3281 -Rff: Ditto, but also thaw all frozen messages,
3282 -Rr: String is regex
3283 -Rrf: Regex and force
3284 -Rrff: Regex and force and thaw
3286 in all cases provided there are no further characters in this
3292 for (i = 0; i < nelem(rsopts); i++)
3293 if (Ustrcmp(argrest, rsopts[i]) == 0)
3295 if (i != 2) queue_run_force = TRUE;
3296 if (i >= 2) deliver_selectstring_regex = TRUE;
3297 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3298 argrest += Ustrlen(rsopts[i]);
3302 /* -R: Set string to match in addresses for forced queue run to
3303 pick out particular messages. */
3306 deliver_selectstring = argrest;
3307 else if (i+1 < argc)
3308 deliver_selectstring = argv[++i];
3311 fprintf(stderr, "exim: string expected after -R\n");
3317 /* -r: an obsolete synonym for -f (see above) */
3320 /* -S: Like -R but works on sender. */
3322 case 'S': /* Synonymous with -qS... */
3323 receiving_message = FALSE;
3325 /* -Sf: As -S (below) but force all deliveries,
3326 -Sff: Ditto, but also thaw all frozen messages,
3327 -Sr: String is regex
3328 -Srf: Regex and force
3329 -Srff: Regex and force and thaw
3331 in all cases provided there are no further characters in this
3337 for (i = 0; i < nelem(rsopts); i++)
3338 if (Ustrcmp(argrest, rsopts[i]) == 0)
3340 if (i != 2) queue_run_force = TRUE;
3341 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3342 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3343 argrest += Ustrlen(rsopts[i]);
3347 /* -S: Set string to match in addresses for forced queue run to
3348 pick out particular messages. */
3351 deliver_selectstring_sender = argrest;
3352 else if (i+1 < argc)
3353 deliver_selectstring_sender = argv[++i];
3356 fprintf(stderr, "exim: string expected after -S\n");
3361 /* -Tqt is an option that is exclusively for use by the testing suite.
3362 It is not recognized in other circumstances. It allows for the setting up
3363 of explicit "queue times" so that various warning/retry things can be
3364 tested. Otherwise variability of clock ticks etc. cause problems. */
3367 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3368 fudged_queue_times = argv[++i];
3373 /* -t: Set flag to extract recipients from body of message. */
3376 if (*argrest == 0) extract_recipients = TRUE;
3378 /* -ti: Set flag to extract recipients from body of message, and also
3379 specify that dot does not end the message. */
3381 else if (Ustrcmp(argrest, "i") == 0)
3383 extract_recipients = TRUE;
3387 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3390 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3397 /* -U: This means "initial user submission" in sendmail, apparently. The
3398 doc claims that in future sendmail may refuse syntactically invalid
3399 messages instead of fixing them. For the moment, we just ignore it. */
3405 /* -v: verify things - this is a very low-level debugging */
3410 debug_selector |= D_v;
3411 debug_file = stderr;
3417 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3419 The -x flag tells the sendmail command that mail from a local
3420 mail program has National Language Support (NLS) extended characters
3421 in the body of the mail item. The sendmail command can send mail with
3422 extended NLS characters across networks that normally corrupts these
3425 As Exim is 8-bit clean, it just ignores this flag. */
3428 if (*argrest != 0) badarg = TRUE;
3431 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3432 logs to that file. We swallow the parameter and otherwise ignore it. */
3435 if (*argrest == '\0')
3438 fprintf(stderr, "exim: string expected after -X\n");
3444 if (*argrest == '\0')
3445 if (++i < argc) log_oneline = argv[i]; else
3447 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3452 /* All other initial characters are errors */
3457 } /* End of high-level switch statement */
3459 /* Failed to recognize the option, or syntax error */
3463 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3464 "option %s\n", arg);
3470 /* If -R or -S have been specified without -q, assume a single queue run. */
3472 if ( (deliver_selectstring || deliver_selectstring_sender)
3473 && queue_interval < 0)
3478 /* If usage_wanted is set we call the usage function - which never returns */
3479 if (usage_wanted) exim_usage(called_as);
3481 /* Arguments have been processed. Check for incompatibilities. */
3483 (smtp_input || extract_recipients || recipients_arg < argc) &&
3484 (daemon_listen || queue_interval >= 0 || bi_option ||
3485 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3486 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3489 msg_action_arg > 0 &&
3490 (daemon_listen || queue_interval > 0 || list_options ||
3491 (checking && msg_action != MSG_LOAD) ||
3492 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3495 (daemon_listen || queue_interval > 0) &&
3496 (sender_address != NULL || list_options || list_queue || checking ||
3500 daemon_listen && queue_interval == 0
3503 inetd_wait_mode && queue_interval >= 0
3507 (checking || smtp_input || extract_recipients ||
3508 filter_test != FTEST_NONE || bi_option)
3511 verify_address_mode &&
3512 (address_test_mode || smtp_input || extract_recipients ||
3513 filter_test != FTEST_NONE || bi_option)
3516 address_test_mode && (smtp_input || extract_recipients ||
3517 filter_test != FTEST_NONE || bi_option)
3520 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3524 deliver_selectstring != NULL && queue_interval < 0
3527 msg_action == MSG_LOAD &&
3528 (!expansion_test || expansion_test_message != NULL)
3532 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3536 /* If debugging is set up, set the file and the file descriptor to pass on to
3537 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3538 to run in the foreground. */
3540 if (debug_selector != 0)
3542 debug_file = stderr;
3543 debug_fd = fileno(debug_file);
3544 background_daemon = FALSE;
3545 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3546 if (debug_selector != D_v) /* -v only doesn't show this */
3548 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3549 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3551 if (!version_printed)
3552 show_whats_supported(stderr);
3556 /* When started with root privilege, ensure that the limits on the number of
3557 open files and the number of processes (where that is accessible) are
3558 sufficiently large, or are unset, in case Exim has been called from an
3559 environment where the limits are screwed down. Not all OS have the ability to
3560 change some of these limits. */
3564 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3570 #ifdef RLIMIT_NOFILE
3571 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3573 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3575 rlp.rlim_cur = rlp.rlim_max = 0;
3578 /* I originally chose 1000 as a nice big number that was unlikely to
3579 be exceeded. It turns out that some older OS have a fixed upper limit of
3582 if (rlp.rlim_cur < 1000)
3584 rlp.rlim_cur = rlp.rlim_max = 1000;
3585 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3587 rlp.rlim_cur = rlp.rlim_max = 256;
3588 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3589 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3596 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3598 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3600 rlp.rlim_cur = rlp.rlim_max = 0;
3603 #ifdef RLIM_INFINITY
3604 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3606 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3608 if (rlp.rlim_cur < 1000)
3610 rlp.rlim_cur = rlp.rlim_max = 1000;
3612 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3613 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3619 /* Exim is normally entered as root (but some special configurations are
3620 possible that don't do this). However, it always spins off sub-processes that
3621 set their uid and gid as required for local delivery. We don't want to pass on
3622 any extra groups that root may belong to, so we want to get rid of them all at
3625 We need to obey setgroups() at this stage, before possibly giving up root
3626 privilege for a changed configuration file, but later on we might need to
3627 check on the additional groups for the admin user privilege - can't do that
3628 till after reading the config, which might specify the exim gid. Therefore,
3629 save the group list here first. */
3631 group_count = getgroups(NGROUPS_MAX, group_list);
3632 if (group_count < 0)
3634 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3638 /* There is a fundamental difference in some BSD systems in the matter of
3639 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3640 known not to be different. On the "different" systems there is a single group
3641 list, and the first entry in it is the current group. On all other versions of
3642 Unix there is a supplementary group list, which is in *addition* to the current
3643 group. Consequently, to get rid of all extraneous groups on a "standard" system
3644 you pass over 0 groups to setgroups(), while on a "different" system you pass
3645 over a single group - the current group, which is always the first group in the
3646 list. Calling setgroups() with zero groups on a "different" system results in
3647 an error return. The following code should cope with both types of system.
3649 However, if this process isn't running as root, setgroups() can't be used
3650 since you have to be root to run it, even if throwing away groups. Not being
3651 root here happens only in some unusual configurations. We just ignore the
3654 if (setgroups(0, NULL) != 0)
3656 if (setgroups(1, group_list) != 0 && !unprivileged)
3658 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3663 /* If the configuration file name has been altered by an argument on the
3664 command line (either a new file name or a macro definition) and the caller is
3665 not root, or if this is a filter testing run, remove any setuid privilege the
3666 program has and run as the underlying user.
3668 The exim user is locked out of this, which severely restricts the use of -C
3671 Otherwise, set the real ids to the effective values (should be root unless run
3672 from inetd, which it can either be root or the exim uid, if one is configured).
3674 There is a private mechanism for bypassing some of this, in order to make it
3675 possible to test lots of configurations automatically, without having either to
3676 recompile each time, or to patch in an actual configuration file name and other
3677 values (such as the path name). If running in the test harness, pretend that
3678 configuration file changes and macro definitions haven't happened. */
3681 (!trusted_config || /* Config changed, or */
3682 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3683 real_uid != root_uid && /* Not root, and */
3684 !running_in_test_harness /* Not fudged */
3686 expansion_test /* expansion testing */
3688 filter_test != FTEST_NONE) /* Filter testing */
3690 setgroups(group_count, group_list);
3691 exim_setugid(real_uid, real_gid, FALSE,
3692 US"-C, -D, -be or -bf forces real uid");
3693 removed_privilege = TRUE;
3695 /* In the normal case when Exim is called like this, stderr is available
3696 and should be used for any logging information because attempts to write
3697 to the log will usually fail. To arrange this, we unset really_exim. However,
3698 if no stderr is available there is no point - we might as well have a go
3699 at the log (if it fails, syslog will be written).
3701 Note that if the invoker is Exim, the logs remain available. Messing with
3702 this causes unlogged successful deliveries. */
3704 if ((log_stderr != NULL) && (real_uid != exim_uid))
3705 really_exim = FALSE;
3708 /* Privilege is to be retained for the moment. It may be dropped later,
3709 depending on the job that this Exim process has been asked to do. For now, set
3710 the real uid to the effective so that subsequent re-execs of Exim are done by a
3713 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3715 /* If testing a filter, open the file(s) now, before wasting time doing other
3716 setups and reading the message. */
3718 if ((filter_test & FTEST_SYSTEM) != 0)
3720 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3723 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3725 return EXIT_FAILURE;
3729 if ((filter_test & FTEST_USER) != 0)
3731 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3734 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3736 return EXIT_FAILURE;
3740 /* Initialise lookup_list
3741 If debugging, already called above via version reporting.
3742 In either case, we initialise the list of available lookups while running
3743 as root. All dynamically modules are loaded from a directory which is
3744 hard-coded into the binary and is code which, if not a module, would be
3745 part of Exim already. Ability to modify the content of the directory
3746 is equivalent to the ability to modify a setuid binary!
3748 This needs to happen before we read the main configuration. */
3752 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3755 /* Read the main runtime configuration data; this gives up if there
3756 is a failure. It leaves the configuration file open so that the subsequent
3757 configuration data for delivery can be read if needed.
3759 NOTE: immediatly after opening the configuration file we change the working
3760 directory to "/"! Later we change to $spool_directory. We do it there, because
3761 during readconf_main() some expansion takes place already. */
3763 /* Store the initial cwd before we change directories */
3764 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3766 perror("exim: can't get the current working directory");
3771 -be[m] expansion test -
3772 -b[fF] filter test new
3774 -bmalware malware_test_file new
3776 -brw rewrite test new
3778 -bv[s] address verify -
3780 -bP <option> (except -bP config, which sets list_config)
3782 If any of these options is set, we suppress warnings about configuration
3783 issues (currently about tls_advertise_hosts and keep_environment not being
3786 readconf_main(checking || list_options);
3788 /* Now in directory "/" */
3790 if (cleanup_environment() == FALSE)
3791 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3794 /* If an action on specific messages is requested, or if a daemon or queue
3795 runner is being started, we need to know if Exim was called by an admin user.
3796 This is the case if the real user is root or exim, or if the real group is
3797 exim, or if one of the supplementary groups is exim or a group listed in
3798 admin_groups. We don't fail all message actions immediately if not admin_user,
3799 since some actions can be performed by non-admin users. Instead, set admin_user
3800 for later interrogation. */
3802 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3807 for (i = 0; i < group_count; i++)
3809 if (group_list[i] == exim_gid) admin_user = TRUE;
3810 else if (admin_groups != NULL)
3812 for (j = 1; j <= (int)(admin_groups[0]); j++)
3813 if (admin_groups[j] == group_list[i])
3814 { admin_user = TRUE; break; }
3816 if (admin_user) break;
3820 /* Another group of privileged users are the trusted users. These are root,
3821 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3822 are permitted to specify sender_addresses with -f on the command line, and
3823 other message parameters as well. */
3825 if (real_uid == root_uid || real_uid == exim_uid)
3826 trusted_caller = TRUE;
3831 if (trusted_users != NULL)
3833 for (i = 1; i <= (int)(trusted_users[0]); i++)
3834 if (trusted_users[i] == real_uid)
3835 { trusted_caller = TRUE; break; }
3838 if (!trusted_caller && trusted_groups != NULL)
3840 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3842 if (trusted_groups[i] == real_gid)
3843 trusted_caller = TRUE;
3844 else for (j = 0; j < group_count; j++)
3846 if (trusted_groups[i] == group_list[j])
3847 { trusted_caller = TRUE; break; }
3849 if (trusted_caller) break;
3854 /* Handle the decoding of logging options. */
3856 decode_bits(log_selector, log_selector_size, log_notall,
3857 log_selector_string, log_options, log_options_count, US"log", 0);
3862 debug_printf("configuration file is %s\n", config_main_filename);
3863 debug_printf("log selectors =");
3864 for (i = 0; i < log_selector_size; i++)
3865 debug_printf(" %08x", log_selector[i]);
3869 /* If domain literals are not allowed, check the sender address that was
3870 supplied with -f. Ditto for a stripped trailing dot. */
3872 if (sender_address != NULL)
3874 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3876 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3877 "allowed\n", sender_address);
3878 return EXIT_FAILURE;
3880 if (f_end_dot && !strip_trailing_dot)
3882 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3883 "(trailing dot not allowed)\n", sender_address);
3884 return EXIT_FAILURE;
3888 /* See if an admin user overrode our logging. */
3890 if (cmdline_syslog_name != NULL)
3894 syslog_processname = cmdline_syslog_name;
3895 log_file_path = string_copy(CUS"syslog");
3899 /* not a panic, non-privileged users should not be able to spam paniclog */
3901 "exim: you lack sufficient privilege to specify syslog process name\n");
3902 return EXIT_FAILURE;
3906 /* Paranoia check of maximum lengths of certain strings. There is a check
3907 on the length of the log file path in log.c, which will come into effect
3908 if there are any calls to write the log earlier than this. However, if we
3909 get this far but the string is very long, it is better to stop now than to
3910 carry on and (e.g.) receive a message and then have to collapse. The call to
3911 log_write() from here will cause the ultimate panic collapse if the complete
3912 file name exceeds the buffer length. */
3914 if (Ustrlen(log_file_path) > 200)
3915 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3916 "log_file_path is longer than 200 chars: aborting");
3918 if (Ustrlen(pid_file_path) > 200)
3919 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3920 "pid_file_path is longer than 200 chars: aborting");
3922 if (Ustrlen(spool_directory) > 200)
3923 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3924 "spool_directory is longer than 200 chars: aborting");
3926 /* Length check on the process name given to syslog for its TAG field,
3927 which is only permitted to be 32 characters or less. See RFC 3164. */
3929 if (Ustrlen(syslog_processname) > 32)
3930 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3931 "syslog_processname is longer than 32 chars: aborting");
3936 log_write(0, LOG_MAIN, "%s", log_oneline);
3937 return EXIT_SUCCESS;
3940 return EXIT_FAILURE;
3942 /* In some operating systems, the environment variable TMPDIR controls where
3943 temporary files are created; Exim doesn't use these (apart from when delivering
3944 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3945 If TMPDIR is found in the environment, reset it to the value defined in the
3946 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3947 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3948 EXIM_TMPDIR by the build scripts.
3954 if (environ) for (p = USS environ; *p; p++)
3955 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3957 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3958 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3960 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3965 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3966 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3967 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3968 called by a user who has set the TZ variable. This then affects the timestamps
3969 in log files and in Received: headers, and any created Date: header lines. The
3970 required timezone is settable in the configuration file, so nothing can be done
3971 about this earlier - but hopefully nothing will normally be logged earlier than
3972 this. We have to make a new environment if TZ is wrong, but don't bother if
3973 timestamps_utc is set, because then all times are in UTC anyway. */
3975 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3976 timestamps_utc = TRUE;
3979 uschar *envtz = US getenv("TZ");
3981 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3982 : timezone_string != NULL
3985 uschar **p = USS environ;
3989 if (environ) while (*p++) count++;
3990 if (!envtz) count++;
3991 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3992 if (environ) for (p = USS environ; *p; p++)
3993 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3994 if (timezone_string)
3996 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3997 sprintf(CS *newp++, "TZ=%s", timezone_string);
4002 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4003 tod_stamp(tod_log));
4007 /* Handle the case when we have removed the setuid privilege because of -C or
4008 -D. This means that the caller of Exim was not root.
4010 There is a problem if we were running as the Exim user. The sysadmin may
4011 expect this case to retain privilege because "the binary was called by the
4012 Exim user", but it hasn't, because either the -D option set macros, or the
4013 -C option set a non-trusted configuration file. There are two possibilities:
4015 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4016 to do message deliveries. Thus, the fact that it is running as a
4017 non-privileged user is plausible, and might be wanted in some special
4018 configurations. However, really_exim will have been set false when
4019 privilege was dropped, to stop Exim trying to write to its normal log
4020 files. Therefore, re-enable normal log processing, assuming the sysadmin
4021 has set up the log directory correctly.
4023 (2) If deliver_drop_privilege is not set, the configuration won't work as
4024 apparently intended, and so we log a panic message. In order to retain
4025 root for -C or -D, the caller must either be root or be invoking a
4026 trusted configuration file (when deliver_drop_privilege is false). */
4028 if ( removed_privilege
4029 && (!trusted_config || opt_D_used)
4030 && real_uid == exim_uid)
4031 if (deliver_drop_privilege)
4032 really_exim = TRUE; /* let logging work normally */
4034 log_write(0, LOG_MAIN|LOG_PANIC,
4035 "exim user lost privilege for using %s option",
4036 trusted_config? "-D" : "-C");
4038 /* Start up Perl interpreter if Perl support is configured and there is a
4039 perl_startup option, and the configuration or the command line specifies
4040 initializing starting. Note that the global variables are actually called
4041 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4044 if (perl_start_option != 0)
4045 opt_perl_at_start = (perl_start_option > 0);
4046 if (opt_perl_at_start && opt_perl_startup != NULL)
4049 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4050 errstr = init_perl(opt_perl_startup);
4053 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4054 return EXIT_FAILURE;
4056 opt_perl_started = TRUE;
4058 #endif /* EXIM_PERL */
4060 /* Log the arguments of the call if the configuration file said so. This is
4061 a debugging feature for finding out what arguments certain MUAs actually use.
4062 Don't attempt it if logging is disabled, or if listing variables or if
4063 verifying/testing addresses or expansions. */
4065 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4066 && really_exim && !list_options && !checking)
4069 uschar *p = big_buffer;
4070 Ustrcpy(p, "cwd= (failed)");
4072 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4075 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4077 for (i = 0; i < argc; i++)
4079 int len = Ustrlen(argv[i]);
4080 const uschar *printing;
4082 if (p + len + 8 >= big_buffer + big_buffer_size)
4085 log_write(0, LOG_MAIN, "%s", big_buffer);
4086 Ustrcpy(big_buffer, "...");
4089 printing = string_printing(argv[i]);
4090 if (printing[0] == 0) quote = US"\""; else
4092 const uschar *pp = printing;
4094 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4096 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4097 (p - big_buffer) - 4), printing, quote);
4101 if (LOGGING(arguments))
4102 log_write(0, LOG_MAIN, "%s", big_buffer);
4104 debug_printf("%s\n", big_buffer);
4107 /* Set the working directory to be the top-level spool directory. We don't rely
4108 on this in the code, which always uses fully qualified names, but it's useful
4109 for core dumps etc. Don't complain if it fails - the spool directory might not
4110 be generally accessible and calls with the -C option (and others) have lost
4111 privilege by now. Before the chdir, we try to ensure that the directory exists.
4114 if (Uchdir(spool_directory) != 0)
4117 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4118 dummy = /* quieten compiler */ Uchdir(spool_directory);
4121 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4122 alias file. Exim doesn't have such a concept, but this call is screwed into
4123 Sun's YP makefiles. Handle this by calling a configured script, as the real
4124 user who called Exim. The -oA option can be used to pass an argument to the
4129 (void)fclose(config_file);
4130 if (bi_command != NULL)
4134 argv[i++] = bi_command;
4135 if (alias_arg != NULL) argv[i++] = alias_arg;
4138 setgroups(group_count, group_list);
4139 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4141 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4142 (argv[1] == NULL)? US"" : argv[1]);
4144 execv(CS argv[0], (char *const *)argv);
4145 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4150 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4155 /* We moved the admin/trusted check to be immediately after reading the
4156 configuration file. We leave these prints here to ensure that syslog setup,
4157 logfile setup, and so on has already happened. */
4159 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4160 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4162 /* Only an admin user may start the daemon or force a queue run in the default
4163 configuration, but the queue run restriction can be relaxed. Only an admin
4164 user may request that a message be returned to its sender forthwith. Only an
4165 admin user may specify a debug level greater than D_v (because it might show
4166 passwords, etc. in lookup queries). Only an admin user may request a queue
4167 count. Only an admin user can use the test interface to scan for email
4168 (because Exim will be in the spool dir and able to look at mails). */
4172 BOOL debugset = (debug_selector & ~D_v) != 0;
4173 if (deliver_give_up || daemon_listen || malware_test_file ||
4174 (count_queue && queue_list_requires_admin) ||
4175 (list_queue && queue_list_requires_admin) ||
4176 (queue_interval >= 0 && prod_requires_admin) ||
4177 (debugset && !running_in_test_harness))
4179 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4184 /* If the real user is not root or the exim uid, the argument for passing
4185 in an open TCP/IP connection for another message is not permitted, nor is
4186 running with the -N option for any delivery action, unless this call to exim is
4187 one that supplied an input message, or we are using a patched exim for
4188 regression testing. */
4190 if (real_uid != root_uid && real_uid != exim_uid &&
4191 (continue_hostname != NULL ||
4193 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4194 )) && !running_in_test_harness)
4196 fprintf(stderr, "exim: Permission denied\n");
4197 return EXIT_FAILURE;
4200 /* If the caller is not trusted, certain arguments are ignored when running for
4201 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4202 Note that authority for performing certain actions on messages is tested in the
4203 queue_action() function. */
4205 if (!trusted_caller && !checking)
4207 sender_host_name = sender_host_address = interface_address =
4208 sender_ident = received_protocol = NULL;
4209 sender_host_port = interface_port = 0;
4210 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4213 /* If a sender host address is set, extract the optional port number off the
4214 end of it and check its syntax. Do the same thing for the interface address.
4215 Exim exits if the syntax is bad. */
4219 if (sender_host_address != NULL)
4220 sender_host_port = check_port(sender_host_address);
4221 if (interface_address != NULL)
4222 interface_port = check_port(interface_address);
4225 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4230 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4231 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4235 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4236 return EXIT_FAILURE;
4240 /* If an SMTP message is being received check to see if the standard input is a
4241 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4242 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4247 union sockaddr_46 inetd_sock;
4248 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4249 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4251 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4252 if (family == AF_INET || family == AF_INET6)
4254 union sockaddr_46 interface_sock;
4255 size = sizeof(interface_sock);
4257 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4258 interface_address = host_ntoa(-1, &interface_sock, NULL,
4261 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4263 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4266 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4267 NULL, &sender_host_port);
4268 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4269 "inetd is not supported when mua_wrapper is set");
4274 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4275 return EXIT_FAILURE;
4281 /* If the load average is going to be needed while receiving a message, get it
4282 now for those OS that require the first call to os_getloadavg() to be done as
4283 root. There will be further calls later for each message received. */
4285 #ifdef LOAD_AVG_NEEDS_ROOT
4286 if (receiving_message &&
4287 (queue_only_load >= 0 ||
4288 (is_inetd && smtp_load_reserve >= 0)
4291 load_average = OS_GETLOADAVG();
4295 /* The queue_only configuration option can be overridden by -odx on the command
4296 line, except that if queue_only_override is false, queue_only cannot be unset
4297 from the command line. */
4299 if (queue_only_set && (queue_only_override || arg_queue_only))
4300 queue_only = arg_queue_only;
4302 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4305 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4306 if (arg_smtp_receive_timeout >= 0)
4307 smtp_receive_timeout = arg_smtp_receive_timeout;
4309 /* If Exim was started with root privilege, unless we have already removed the
4310 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4311 except when starting the daemon or doing some kind of delivery or address
4312 testing (-bt). These are the only cases when root need to be retained. We run
4313 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4314 retained only for starting the daemon. We always do the initgroups() in this
4315 situation (controlled by the TRUE below), in order to be as close as possible
4316 to the state Exim usually runs in. */
4318 if (!unprivileged && /* originally had root AND */
4319 !removed_privilege && /* still got root AND */
4320 !daemon_listen && /* not starting the daemon */
4321 queue_interval <= 0 && /* (either kind of daemon) */
4323 deliver_drop_privilege || /* requested unprivileged */
4325 queue_interval < 0 && /* not running the queue */
4326 (msg_action_arg < 0 || /* and */
4327 msg_action != MSG_DELIVER) && /* not delivering and */
4328 (!checking || !address_test_mode) /* not address checking */
4332 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4335 /* When we are retaining a privileged uid, we still change to the exim gid. */
4340 rv = setgid(exim_gid);
4341 /* Impact of failure is that some stuff might end up with an incorrect group.
4342 We track this for failures from root, since any attempt to change privilege
4343 by root should succeed and failures should be examined. For non-root,
4344 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4345 no need to complain then. */
4348 if (!(unprivileged || removed_privilege))
4351 "exim: changing group failed: %s\n", strerror(errno));
4355 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4356 (long int)exim_gid, strerror(errno));
4360 /* Handle a request to scan a file for malware */
4361 if (malware_test_file)
4363 #ifdef WITH_CONTENT_SCAN
4365 set_process_info("scanning file for malware");
4366 result = malware_in_file(malware_test_file);
4369 printf("No malware found.\n");
4374 printf("Malware lookup returned non-okay/fail: %d\n", result);
4378 printf("Malware found: %s\n", malware_name);
4380 printf("Malware scan detected malware of unknown name.\n");
4382 printf("Malware scanning not enabled at compile time.\n");
4387 /* Handle a request to list the delivery queue */
4391 set_process_info("listing the queue");
4392 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4396 /* Handle a request to count the delivery queue */
4400 set_process_info("counting the queue");
4405 /* Handle actions on specific messages, except for the force delivery and
4406 message load actions, which are done below. Some actions take a whole list of
4407 message ids, which are known to continue up to the end of the arguments. Others
4408 take a single message id and then operate on the recipients list. */
4410 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4412 int yield = EXIT_SUCCESS;
4413 set_process_info("acting on specified messages");
4415 if (!one_msg_action)
4417 for (i = msg_action_arg; i < argc; i++)
4418 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4419 yield = EXIT_FAILURE;
4422 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4423 recipients_arg)) yield = EXIT_FAILURE;
4427 /* We used to set up here to skip reading the ACL section, on
4428 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4429 Now, since the intro of the ${acl } expansion, ACL definitions may be
4430 needed in transports so we lost the optimisation. */
4434 /* The configuration data will have been read into POOL_PERM because we won't
4435 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4436 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4437 configuration were read into POOL_MAIN, because we don't do any resets till
4438 later on. However, it seems right, and it does ensure that both pools get used.
4441 store_pool = POOL_MAIN;
4443 /* Handle the -brt option. This is for checking out retry configurations.
4444 The next three arguments are a domain name or a complete address, and
4445 optionally two error numbers. All it does is to call the function that
4446 scans the retry configuration data. */
4448 if (test_retry_arg >= 0)
4450 retry_config *yield;
4451 int basic_errno = 0;
4455 if (test_retry_arg >= argc)
4457 printf("-brt needs a domain or address argument\n");
4458 exim_exit(EXIT_FAILURE);
4460 s1 = argv[test_retry_arg++];
4463 /* If the first argument contains no @ and no . it might be a local user
4464 or it might be a single-component name. Treat as a domain. */
4466 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4468 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4469 "being \ntreated as a one-component domain, not as a local part.\n\n",
4473 /* There may be an optional second domain arg. */
4475 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4476 s2 = argv[test_retry_arg++];
4478 /* The final arg is an error name */
4480 if (test_retry_arg < argc)
4482 uschar *ss = argv[test_retry_arg];
4484 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4487 printf("%s\n", CS error);
4488 return EXIT_FAILURE;
4491 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4492 code > 100 as an error is for matching codes to the decade. Turn them into
4493 a real error code, off the decade. */
4495 if (basic_errno == ERRNO_MAIL4XX ||
4496 basic_errno == ERRNO_RCPT4XX ||
4497 basic_errno == ERRNO_DATA4XX)
4499 int code = (more_errno >> 8) & 255;
4501 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4502 else if (code > 100)
4503 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4507 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4508 if (yield == NULL) printf("No retry information found\n"); else
4511 more_errno = yield->more_errno;
4512 printf("Retry rule: %s ", yield->pattern);
4514 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4516 printf("quota%s%s ",
4517 (more_errno > 0)? "_" : "",
4518 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4520 else if (yield->basic_errno == ECONNREFUSED)
4522 printf("refused%s%s ",
4523 (more_errno > 0)? "_" : "",
4524 (more_errno == 'M')? "MX" :
4525 (more_errno == 'A')? "A" : "");
4527 else if (yield->basic_errno == ETIMEDOUT)
4530 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4532 if (more_errno != 0) printf("_%s",
4533 (more_errno == 'M')? "MX" : "A");
4536 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4537 printf("auth_failed ");
4540 for (r = yield->rules; r != NULL; r = r->next)
4542 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4543 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4549 printf(",%d.", x/1000);
4563 exim_exit(EXIT_SUCCESS);
4566 /* Handle a request to list one or more configuration options */
4567 /* If -n was set, we suppress some information */
4571 set_process_info("listing variables");
4572 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4573 else for (i = recipients_arg; i < argc; i++)
4576 (Ustrcmp(argv[i], "router") == 0 ||
4577 Ustrcmp(argv[i], "transport") == 0 ||
4578 Ustrcmp(argv[i], "authenticator") == 0 ||
4579 Ustrcmp(argv[i], "macro") == 0 ||
4580 Ustrcmp(argv[i], "environment") == 0))
4582 readconf_print(argv[i+1], argv[i], flag_n);
4585 else readconf_print(argv[i], NULL, flag_n);
4587 exim_exit(EXIT_SUCCESS);
4592 set_process_info("listing config");
4593 readconf_print(US"config", NULL, flag_n);
4594 exim_exit(EXIT_SUCCESS);
4598 /* Initialise subsystems as required */
4599 #ifndef DISABLE_DKIM
4605 /* Handle a request to deliver one or more messages that are already on the
4606 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4607 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4609 Delivery of specific messages is typically used for a small number when
4610 prodding by hand (when the option forced_delivery will be set) or when
4611 re-execing to regain root privilege. Each message delivery must happen in a
4612 separate process, so we fork a process for each one, and run them sequentially
4613 so that debugging output doesn't get intertwined, and to avoid spawning too
4614 many processes if a long list is given. However, don't fork for the last one;
4615 this saves a process in the common case when Exim is called to deliver just one
4618 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4620 if (prod_requires_admin && !admin_user)
4622 fprintf(stderr, "exim: Permission denied\n");
4623 exim_exit(EXIT_FAILURE);
4625 set_process_info("delivering specified messages");
4626 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4627 for (i = msg_action_arg; i < argc; i++)
4632 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4633 else if ((pid = fork()) == 0)
4635 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4636 _exit(EXIT_SUCCESS);
4640 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4642 exim_exit(EXIT_FAILURE);
4646 exim_exit(EXIT_SUCCESS);
4650 /* If only a single queue run is requested, without SMTP listening, we can just
4651 turn into a queue runner, with an optional starting message id. */
4653 if (queue_interval == 0 && !daemon_listen)
4655 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4656 (start_queue_run_id == NULL)? US"" : US" starting at ",
4657 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4658 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4659 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4661 set_process_info("running the '%s' queue (single queue run)", queue_name);
4663 set_process_info("running the queue (single queue run)");
4664 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4665 exim_exit(EXIT_SUCCESS);
4669 /* Find the login name of the real user running this process. This is always
4670 needed when receiving a message, because it is written into the spool file. It
4671 may also be used to construct a from: or a sender: header, and in this case we
4672 need the user's full name as well, so save a copy of it, checked for RFC822
4673 syntax and munged if necessary, if it hasn't previously been set by the -F
4674 argument. We may try to get the passwd entry more than once, in case NIS or
4675 other delays are in evidence. Save the home directory for use in filter testing
4680 if ((pw = getpwuid(real_uid)) != NULL)
4682 originator_login = string_copy(US pw->pw_name);
4683 originator_home = string_copy(US pw->pw_dir);
4685 /* If user name has not been set by -F, set it from the passwd entry
4686 unless -f has been used to set the sender address by a trusted user. */
4688 if (originator_name == NULL)
4690 if (sender_address == NULL ||
4691 (!trusted_caller && filter_test == FTEST_NONE))
4693 uschar *name = US pw->pw_gecos;
4694 uschar *amp = Ustrchr(name, '&');
4697 /* Most Unix specify that a '&' character in the gecos field is
4698 replaced by a copy of the login name, and some even specify that
4699 the first character should be upper cased, so that's what we do. */
4704 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4705 amp - name, name, &loffset, originator_login, amp + 1);
4706 buffer[loffset] = toupper(buffer[loffset]);
4710 /* If a pattern for matching the gecos field was supplied, apply
4711 it and then expand the name string. */
4713 if (gecos_pattern != NULL && gecos_name != NULL)
4716 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4718 if (regex_match_and_setup(re, name, 0, -1))
4720 uschar *new_name = expand_string(gecos_name);
4722 if (new_name != NULL)
4724 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4725 "gecos field \"%s\"\n", new_name, name);
4728 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4729 "\"%s\": %s\n", gecos_name, expand_string_message);
4731 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4732 "gecos field \"%s\"\n", gecos_pattern, name);
4733 store_free((void *)re);
4735 originator_name = string_copy(name);
4738 /* A trusted caller has used -f but not -F */
4740 else originator_name = US"";
4743 /* Break the retry loop */
4748 if (++i > finduser_retries) break;
4752 /* If we cannot get a user login, log the incident and give up, unless the
4753 configuration specifies something to use. When running in the test harness,
4754 any setting of unknown_login overrides the actual name. */
4756 if (originator_login == NULL || running_in_test_harness)
4758 if (unknown_login != NULL)
4760 originator_login = expand_string(unknown_login);
4761 if (originator_name == NULL && unknown_username != NULL)
4762 originator_name = expand_string(unknown_username);
4763 if (originator_name == NULL) originator_name = US"";
4765 if (originator_login == NULL)
4766 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4770 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4773 originator_name = string_copy(parse_fix_phrase(originator_name,
4774 Ustrlen(originator_name), big_buffer, big_buffer_size));
4776 /* If a message is created by this call of Exim, the uid/gid of its originator
4777 are those of the caller. These values are overridden if an existing message is
4778 read in from the spool. */
4780 originator_uid = real_uid;
4781 originator_gid = real_gid;
4783 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4784 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4786 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4787 returns. We leave this till here so that the originator_ fields are available
4788 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4791 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4795 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4796 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4797 "mua_wrapper is set");
4802 /* If the sender ident has not been set (by a trusted caller) set it to
4803 the caller. This will get overwritten below for an inetd call. If a trusted
4804 caller has set it empty, unset it. */
4806 if (sender_ident == NULL) sender_ident = originator_login;
4807 else if (sender_ident[0] == 0) sender_ident = NULL;
4809 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4810 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4811 originator_* variables set. */
4813 if (test_rewrite_arg >= 0)
4815 really_exim = FALSE;
4816 if (test_rewrite_arg >= argc)
4818 printf("-brw needs an address argument\n");
4819 exim_exit(EXIT_FAILURE);
4821 rewrite_test(argv[test_rewrite_arg]);
4822 exim_exit(EXIT_SUCCESS);
4825 /* A locally-supplied message is considered to be coming from a local user
4826 unless a trusted caller supplies a sender address with -f, or is passing in the
4827 message via SMTP (inetd invocation or otherwise). */
4829 if ((sender_address == NULL && !smtp_input) ||
4830 (!trusted_caller && filter_test == FTEST_NONE))
4832 sender_local = TRUE;
4834 /* A trusted caller can supply authenticated_sender and authenticated_id
4835 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4836 defaults except when host checking. */
4838 if (authenticated_sender == NULL && !host_checking)
4839 authenticated_sender = string_sprintf("%s@%s", originator_login,
4840 qualify_domain_sender);
4841 if (authenticated_id == NULL && !host_checking)
4842 authenticated_id = originator_login;
4845 /* Trusted callers are always permitted to specify the sender address.
4846 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4847 is specified is the empty address. However, if a trusted caller does not
4848 specify a sender address for SMTP input, we leave sender_address unset. This
4849 causes the MAIL commands to be honoured. */
4851 if ((!smtp_input && sender_address == NULL) ||
4852 !receive_check_set_sender(sender_address))
4854 /* Either the caller is not permitted to set a general sender, or this is
4855 non-SMTP input and the trusted caller has not set a sender. If there is no
4856 sender, or if a sender other than <> is set, override with the originator's
4857 login (which will get qualified below), except when checking things. */
4859 if (sender_address == NULL /* No sender_address set */
4861 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4862 !checking)) /* Not running tests, including filter tests */
4864 sender_address = originator_login;
4865 sender_address_forced = FALSE;
4866 sender_address_domain = 0;
4870 /* Remember whether an untrusted caller set the sender address */
4872 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4874 /* Ensure that the sender address is fully qualified unless it is the empty
4875 address, which indicates an error message, or doesn't exist (root caller, smtp
4876 interface, no -f argument). */
4878 if (sender_address != NULL && sender_address[0] != 0 &&
4879 sender_address_domain == 0)
4880 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4881 qualify_domain_sender);
4883 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4885 /* Handle a request to verify a list of addresses, or test them for delivery.
4886 This must follow the setting of the sender address, since routers can be
4887 predicated upon the sender. If no arguments are given, read addresses from
4888 stdin. Set debug_level to at least D_v to get full output for address testing.
4891 if (verify_address_mode || address_test_mode)
4894 int flags = vopt_qualify;
4896 if (verify_address_mode)
4898 if (!verify_as_sender) flags |= vopt_is_recipient;
4899 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4904 flags |= vopt_is_recipient;
4905 debug_selector |= D_v;
4906 debug_file = stderr;
4907 debug_fd = fileno(debug_file);
4908 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4911 if (recipients_arg < argc)
4913 while (recipients_arg < argc)
4915 uschar *s = argv[recipients_arg++];
4918 BOOL finished = FALSE;
4919 uschar *ss = parse_find_address_end(s, FALSE);
4920 if (*ss == ',') *ss = 0; else finished = TRUE;
4921 test_address(s, flags, &exit_value);
4924 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4931 uschar *s = get_stdinput(NULL, NULL);
4932 if (s == NULL) break;
4933 test_address(s, flags, &exit_value);
4937 exim_exit(exit_value);
4940 /* Handle expansion checking. Either expand items on the command line, or read
4941 from stdin if there aren't any. If -Mset was specified, load the message so
4942 that its variables can be used, but restrict this facility to admin users.
4943 Otherwise, if -bem was used, read a message from stdin. */
4947 dns_init(FALSE, FALSE, FALSE);
4948 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4950 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4953 fprintf(stderr, "exim: permission denied\n");
4956 message_id = argv[msg_action_arg];
4957 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4958 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4959 printf ("Failed to load message datafile %s\n", message_id);
4960 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4961 printf ("Failed to load message %s\n", message_id);
4964 /* Read a test message from a file. We fudge it up to be on stdin, saving
4965 stdin itself for later reading of expansion strings. */
4967 else if (expansion_test_message != NULL)
4969 int save_stdin = dup(0);
4970 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4973 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4975 return EXIT_FAILURE;
4978 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4979 message_ended = END_NOTENDED;
4980 read_message_body(receive_msg(extract_recipients));
4981 message_linecount += body_linecount;
4982 (void)dup2(save_stdin, 0);
4983 (void)close(save_stdin);
4984 clearerr(stdin); /* Required by Darwin */
4987 /* Allow $recipients for this testing */
4989 enable_dollar_recipients = TRUE;
4991 /* Expand command line items */
4993 if (recipients_arg < argc)
4995 while (recipients_arg < argc)
4997 uschar *s = argv[recipients_arg++];
4998 uschar *ss = expand_string(s);
4999 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5000 else printf("%s\n", CS ss);
5008 char *(*fn_readline)(const char *) = NULL;
5009 void (*fn_addhist)(const char *) = NULL;
5012 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5018 uschar *source = get_stdinput(fn_readline, fn_addhist);
5019 if (source == NULL) break;
5020 ss = expand_string(source);
5022 printf ("Failed: %s\n", expand_string_message);
5023 else printf("%s\n", CS ss);
5027 if (dlhandle != NULL) dlclose(dlhandle);
5031 /* The data file will be open after -Mset */
5033 if (deliver_datafile >= 0)
5035 (void)close(deliver_datafile);
5036 deliver_datafile = -1;
5039 exim_exit(EXIT_SUCCESS);
5043 /* The active host name is normally the primary host name, but it can be varied
5044 for hosts that want to play several parts at once. We need to ensure that it is
5045 set for host checking, and for receiving messages. */
5047 smtp_active_hostname = primary_hostname;
5048 if (raw_active_hostname != NULL)
5050 uschar *nah = expand_string(raw_active_hostname);
5053 if (!expand_string_forcedfail)
5054 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5055 "(smtp_active_hostname): %s", raw_active_hostname,
5056 expand_string_message);
5058 else if (nah[0] != 0) smtp_active_hostname = nah;
5061 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5062 given IP address so that the blocking and relay configuration can be tested.
5063 Unless a sender_ident was set by -oMt, we discard it (the default is the
5064 caller's login name). An RFC 1413 call is made only if we are running in the
5065 test harness and an incoming interface and both ports are specified, because
5066 there is no TCP/IP call to find the ident for. */
5073 if (!sender_ident_set)
5075 sender_ident = NULL;
5076 if (running_in_test_harness && sender_host_port != 0 &&
5077 interface_address != NULL && interface_port != 0)
5078 verify_get_ident(1413);
5081 /* In case the given address is a non-canonical IPv6 address, canonicize
5082 it. The code works for both IPv4 and IPv6, as it happens. */
5084 size = host_aton(sender_host_address, x);
5085 sender_host_address = store_get(48); /* large enough for full IPv6 */
5086 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5088 /* Now set up for testing */
5090 host_build_sender_fullhost();
5094 sender_local = FALSE;
5095 sender_host_notsocket = TRUE;
5096 debug_file = stderr;
5097 debug_fd = fileno(debug_file);
5098 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5099 "**** but without any ident (RFC 1413) callback.\n"
5100 "**** This is not for real!\n\n",
5101 sender_host_address);
5103 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5104 if (verify_check_host(&hosts_connection_nolog) == OK)
5105 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5106 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5108 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5109 because a log line has already been written for all its failure exists
5110 (usually "connection refused: <reason>") and writing another one is
5111 unnecessary clutter. */
5113 if (smtp_start_session())
5115 reset_point = store_get(0);
5118 store_reset(reset_point);
5119 if (smtp_setup_msg() <= 0) break;
5120 if (!receive_msg(FALSE)) break;
5124 exim_exit(EXIT_SUCCESS);
5128 /* Arrange for message reception if recipients or SMTP were specified;
5129 otherwise complain unless a version print (-bV) happened or this is a filter
5130 verification test or info dump.
5131 In the former case, show the configuration file name. */
5133 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5135 if (version_printed)
5137 printf("Configuration file is %s\n", config_main_filename);
5138 return EXIT_SUCCESS;
5141 if (info_flag != CMDINFO_NONE)
5143 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5144 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5147 if (filter_test == FTEST_NONE)
5148 exim_usage(called_as);
5152 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5153 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5154 that we are not called from inetd, because that is rejected above. The
5155 following configuration settings are forced here:
5157 (1) Synchronous delivery (-odi)
5158 (2) Errors to stderr (-oep == -oeq)
5159 (3) No parallel remote delivery
5160 (4) Unprivileged delivery
5162 We don't force overall queueing options because there are several of them;
5163 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5164 to override any SMTP queueing. */
5168 synchronous_delivery = TRUE;
5169 arg_error_handling = ERRORS_STDERR;
5170 remote_max_parallel = 1;
5171 deliver_drop_privilege = TRUE;
5173 queue_smtp_domains = NULL;
5175 message_utf8_downconvert = -1; /* convert-if-needed */
5180 /* Prepare to accept one or more new messages on the standard input. When a
5181 message has been read, its id is returned in message_id[]. If doing immediate
5182 delivery, we fork a delivery process for each received message, except for the
5183 last one, where we can save a process switch.
5185 It is only in non-smtp mode that error_handling is allowed to be changed from
5186 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5187 sendmail error modes other than -oem ever actually used? Later: yes.) */
5189 if (!smtp_input) error_handling = arg_error_handling;
5191 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5192 logging being sent down the socket and make an identd call to get the
5197 (void)fclose(stderr);
5198 exim_nullstd(); /* Re-open to /dev/null */
5199 verify_get_ident(IDENT_PORT);
5200 host_build_sender_fullhost();
5201 set_process_info("handling incoming connection from %s via inetd",
5205 /* If the sender host address has been set, build sender_fullhost if it hasn't
5206 already been done (which it will have been for inetd). This caters for the
5207 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5208 so that the test for IP options is skipped for -bs input. */
5210 if (sender_host_address != NULL && sender_fullhost == NULL)
5212 host_build_sender_fullhost();
5213 set_process_info("handling incoming connection from %s via -oMa",
5215 sender_host_notsocket = TRUE;
5218 /* Otherwise, set the sender host as unknown except for inetd calls. This
5219 prevents host checking in the case of -bs not from inetd and also for -bS. */
5221 else if (!is_inetd) sender_host_unknown = TRUE;
5223 /* If stdout does not exist, then dup stdin to stdout. This can happen
5224 if exim is started from inetd. In this case fd 0 will be set to the socket,
5225 but fd 1 will not be set. This also happens for passed SMTP channels. */
5227 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5229 /* Set up the incoming protocol name and the state of the program. Root is
5230 allowed to force received protocol via the -oMr option above. If we have come
5231 via inetd, the process info has already been set up. We don't set
5232 received_protocol here for smtp input, as it varies according to
5233 batch/HELO/EHLO/AUTH/TLS. */
5237 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5238 smtp_batched_input? "batched " : "",
5239 (sender_address!= NULL)? sender_address : originator_login);
5243 if (received_protocol == NULL)
5244 received_protocol = string_sprintf("local%s", called_as);
5245 set_process_info("accepting a local non-SMTP message from <%s>",
5249 /* Initialize the session_local_queue-only flag (this will be ignored if
5250 mua_wrapper is set) */
5253 session_local_queue_only = queue_only;
5255 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5256 the spool if so configured. On failure, we must not attempt to send an error
5257 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5258 error code is given.) */
5260 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5262 fprintf(stderr, "exim: insufficient disk space\n");
5263 return EXIT_FAILURE;
5266 /* If this is smtp input of any kind, real or batched, handle the start of the
5269 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5270 because a log line has already been written for all its failure exists
5271 (usually "connection refused: <reason>") and writing another one is
5272 unnecessary clutter. */
5278 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5279 if (verify_check_host(&hosts_connection_nolog) == OK)
5280 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5281 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5282 if (!smtp_start_session())
5285 exim_exit(EXIT_SUCCESS);
5289 /* Otherwise, set up the input size limit here. */
5293 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5294 if (expand_string_message != NULL)
5296 if (thismessage_size_limit == -1)
5297 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5298 "message_size_limit: %s", expand_string_message);
5300 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5301 "message_size_limit: %s", expand_string_message);
5305 /* Loop for several messages when reading SMTP input. If we fork any child
5306 processes, we don't want to wait for them unless synchronous delivery is
5307 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5308 same as SIG_DFL, despite the fact that documentation often lists the default as
5309 "ignore". This is a confusing area. This is what I know:
5311 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5312 processes that complete simply to go away without ever becoming defunct. You
5313 can't then wait for them - but we don't want to wait for them in the
5314 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5315 happen for all OS (e.g. *BSD is different).
5317 But that's not the end of the story. Some (many? all?) systems have the
5318 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5319 has by default, so it seems that the difference is merely one of default
5320 (compare restarting vs non-restarting signals).
5322 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5323 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5324 of the loop below. Paranoia rules.
5326 February 2003: That's *still* not the end of the story. There are now versions
5327 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5328 process then calls waitpid(), a grumble is written to the system log, because
5329 this is logically inconsistent. In other words, it doesn't like the paranoia.
5330 As a consequenc of this, the waitpid() below is now excluded if we are sure
5331 that SIG_IGN works. */
5333 if (!synchronous_delivery)
5336 struct sigaction act;
5337 act.sa_handler = SIG_IGN;
5338 sigemptyset(&(act.sa_mask));
5339 act.sa_flags = SA_NOCLDWAIT;
5340 sigaction(SIGCHLD, &act, NULL);
5342 signal(SIGCHLD, SIG_IGN);
5346 /* Save the current store pool point, for resetting at the start of
5347 each message, and save the real sender address, if any. */
5349 reset_point = store_get(0);
5350 real_sender_address = sender_address;
5352 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5353 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5358 store_reset(reset_point);
5361 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5362 input and build the recipients list, before calling receive_msg() to read the
5363 message proper. Whatever sender address is given in the SMTP transaction is
5364 often ignored for local senders - we use the actual sender, which is normally
5365 either the underlying user running this process or a -f argument provided by
5366 a trusted caller. It is saved in real_sender_address. The test for whether to
5367 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5372 if ((rc = smtp_setup_msg()) > 0)
5374 if (real_sender_address != NULL &&
5375 !receive_check_set_sender(sender_address))
5377 sender_address = raw_sender = real_sender_address;
5378 sender_address_unrewritten = NULL;
5381 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5382 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5383 the very end. The result of the ACL is ignored (as for other non-SMTP
5384 messages). It is run for its potential side effects. */
5386 if (smtp_batched_input && acl_not_smtp_start != NULL)
5388 uschar *user_msg, *log_msg;
5389 enable_dollar_recipients = TRUE;
5390 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5391 &user_msg, &log_msg);
5392 enable_dollar_recipients = FALSE;
5395 /* Now get the data for the message */
5397 more = receive_msg(extract_recipients);
5398 if (message_id[0] == 0)
5401 smtp_log_no_mail(); /* Log no mail if configured */
5402 exim_exit(EXIT_FAILURE);
5407 smtp_log_no_mail(); /* Log no mail if configured */
5408 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5412 /* In the non-SMTP case, we have all the information from the command
5413 line, but must process it in case it is in the more general RFC822
5414 format, and in any case, to detect syntax errors. Also, it appears that
5415 the use of comma-separated lists as single arguments is common, so we
5416 had better support them. */
5422 int count = argc - recipients_arg;
5423 uschar **list = argv + recipients_arg;
5425 /* These options cannot be changed dynamically for non-SMTP messages */
5427 active_local_sender_retain = local_sender_retain;
5428 active_local_from_check = local_from_check;
5430 /* Save before any rewriting */
5432 raw_sender = string_copy(sender_address);
5434 /* Loop for each argument */
5436 for (i = 0; i < count; i++)
5438 int start, end, domain;
5440 uschar *s = list[i];
5442 /* Loop for each comma-separated address */
5446 BOOL finished = FALSE;
5448 uschar *ss = parse_find_address_end(s, FALSE);
5450 if (*ss == ',') *ss = 0; else finished = TRUE;
5452 /* Check max recipients - if -t was used, these aren't recipients */
5454 if (recipients_max > 0 && ++rcount > recipients_max &&
5455 !extract_recipients)
5456 if (error_handling == ERRORS_STDERR)
5458 fprintf(stderr, "exim: too many recipients\n");
5459 exim_exit(EXIT_FAILURE);
5464 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5465 errors_sender_rc : EXIT_FAILURE;
5470 BOOL b = allow_utf8_domains;
5471 allow_utf8_domains = TRUE;
5474 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5477 if (string_is_utf8(recipient))
5478 message_smtputf8 = TRUE;
5480 allow_utf8_domains = b;
5483 if (domain == 0 && !allow_unqualified_recipient)
5486 errmess = US"unqualified recipient address not allowed";
5489 if (recipient == NULL)
5491 if (error_handling == ERRORS_STDERR)
5493 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5494 string_printing(list[i]), errmess);
5495 exim_exit(EXIT_FAILURE);
5501 eblock.text1 = string_printing(list[i]);
5502 eblock.text2 = errmess;
5504 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5505 errors_sender_rc : EXIT_FAILURE;
5509 receive_add_recipient(recipient, -1);
5512 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5516 /* Show the recipients when debugging */
5521 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5522 if (recipients_list != NULL)
5524 debug_printf("Recipients:\n");
5525 for (i = 0; i < recipients_count; i++)
5526 debug_printf(" %s\n", recipients_list[i].address);
5530 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5531 ignored; rejecting here would just add complication, and it can just as
5532 well be done later. Allow $recipients to be visible in the ACL. */
5534 if (acl_not_smtp_start)
5536 uschar *user_msg, *log_msg;
5537 enable_dollar_recipients = TRUE;
5538 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5539 &user_msg, &log_msg);
5540 enable_dollar_recipients = FALSE;
5543 /* Pause for a while waiting for input. If none received in that time,
5544 close the logfile, if we had one open; then if we wait for a long-running
5545 datasource (months, in one use-case) log rotation will not leave us holding
5548 if (!receive_timeout)
5550 struct timeval t = { 30*60, 0 }; /* 30 minutess */
5553 FD_ZERO(&r); FD_SET(0, &r);
5554 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5557 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5558 will just read the headers for the message, and not write anything onto the
5561 message_ended = END_NOTENDED;
5562 more = receive_msg(extract_recipients);
5564 /* more is always FALSE here (not SMTP message) when reading a message
5565 for real; when reading the headers of a message for filter testing,
5566 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5568 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5569 } /* Non-SMTP message reception */
5571 /* If this is a filter testing run, there are headers in store, but
5572 no message on the spool. Run the filtering code in testing mode, setting
5573 the domain to the qualify domain and the local part to the current user,
5574 unless they have been set by options. The prefix and suffix are left unset
5575 unless specified. The the return path is set to to the sender unless it has
5576 already been set from a return-path header in the message. */
5578 if (filter_test != FTEST_NONE)
5580 deliver_domain = (ftest_domain != NULL)?
5581 ftest_domain : qualify_domain_recipient;
5582 deliver_domain_orig = deliver_domain;
5583 deliver_localpart = (ftest_localpart != NULL)?
5584 ftest_localpart : originator_login;
5585 deliver_localpart_orig = deliver_localpart;
5586 deliver_localpart_prefix = ftest_prefix;
5587 deliver_localpart_suffix = ftest_suffix;
5588 deliver_home = originator_home;
5590 if (return_path == NULL)
5592 printf("Return-path copied from sender\n");
5593 return_path = string_copy(sender_address);
5596 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5597 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5599 receive_add_recipient(
5600 string_sprintf("%s%s%s@%s",
5601 (ftest_prefix == NULL)? US"" : ftest_prefix,
5603 (ftest_suffix == NULL)? US"" : ftest_suffix,
5604 deliver_domain), -1);
5606 printf("Recipient = %s\n", recipients_list[0].address);
5607 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5608 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5610 if (chdir("/")) /* Get away from wherever the user is running this from */
5612 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5613 exim_exit(EXIT_FAILURE);
5616 /* Now we run either a system filter test, or a user filter test, or both.
5617 In the latter case, headers added by the system filter will persist and be
5618 available to the user filter. We need to copy the filter variables
5621 if ((filter_test & FTEST_SYSTEM) != 0)
5623 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5624 exim_exit(EXIT_FAILURE);
5627 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5629 if ((filter_test & FTEST_USER) != 0)
5631 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5632 exim_exit(EXIT_FAILURE);
5635 exim_exit(EXIT_SUCCESS);
5638 /* Else act on the result of message reception. We should not get here unless
5639 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5640 will be TRUE. If it is not, check on the number of messages received in this
5643 if (!session_local_queue_only &&
5644 smtp_accept_queue_per_connection > 0 &&
5645 receive_messagecount > smtp_accept_queue_per_connection)
5647 session_local_queue_only = TRUE;
5648 queue_only_reason = 2;
5651 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5652 and queue_only_load is set, check that the load average is below it. If it is
5653 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5654 default), we put the whole session into queue_only mode. It then remains this
5655 way for any subsequent messages on the same SMTP connection. This is a
5656 deliberate choice; even though the load average may fall, it doesn't seem
5657 right to deliver later messages on the same call when not delivering earlier
5658 ones. However, there are odd cases where this is not wanted, so this can be
5659 changed by setting queue_only_load_latch false. */
5661 local_queue_only = session_local_queue_only;
5662 if (!local_queue_only && queue_only_load >= 0)
5664 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5665 if (local_queue_only)
5667 queue_only_reason = 3;
5668 if (queue_only_load_latch) session_local_queue_only = TRUE;
5672 /* If running as an MUA wrapper, all queueing options and freezing options
5676 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5678 /* Log the queueing here, when it will get a message id attached, but
5679 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5682 if (local_queue_only) switch(queue_only_reason)
5685 log_write(L_delay_delivery,
5686 LOG_MAIN, "no immediate delivery: more than %d messages "
5687 "received in one connection", smtp_accept_queue_per_connection);
5691 log_write(L_delay_delivery,
5692 LOG_MAIN, "no immediate delivery: load average %.2f",
5693 (double)load_average/1000.0);
5697 /* Else do the delivery unless the ACL or local_scan() called for queue only
5698 or froze the message. Always deliver in a separate process. A fork failure is
5699 not a disaster, as the delivery will eventually happen on a subsequent queue
5700 run. The search cache must be tidied before the fork, as the parent will
5701 do it before exiting. The child will trigger a lookup failure and
5702 thereby defer the delivery if it tries to use (for example) a cached ldap
5703 connection that the parent has called unbind on. */
5705 else if (!queue_only_policy && !deliver_freeze)
5710 if ((pid = fork()) == 0)
5713 close_unwanted(); /* Close unwanted file descriptors and TLS */
5714 exim_nullstd(); /* Ensure std{in,out,err} exist */
5716 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5717 mode, deliver_drop_privilege is forced TRUE). */
5719 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5721 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5722 2, US"-Mc", message_id);
5723 /* Control does not return here. */
5726 /* No need to re-exec */
5728 rc = deliver_message(message_id, FALSE, FALSE);
5730 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5731 EXIT_SUCCESS : EXIT_FAILURE);
5736 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5737 "process: %s", strerror(errno));
5740 /* In the parent, wait if synchronous delivery is required. This will
5741 always be the case in MUA wrapper mode. */
5743 else if (synchronous_delivery)
5746 while (wait(&status) != pid);
5747 if ((status & 0x00ff) != 0)
5748 log_write(0, LOG_MAIN|LOG_PANIC,
5749 "process %d crashed with signal %d while delivering %s",
5750 (int)pid, status & 0x00ff, message_id);
5751 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5755 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5756 automatically reaps children (see comments above the loop), clear away any
5757 finished subprocesses here, in case there are lots of messages coming in
5758 from the same source. */
5760 #ifndef SIG_IGN_WORKS
5761 while (waitpid(-1, NULL, WNOHANG) > 0);
5765 exim_exit(EXIT_SUCCESS); /* Never returns */
5766 return 0; /* To stop compiler warning */