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Annotation of 43BSDReno/libexec/talkd/talkd.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)talkd.c    5.7 (Berkeley) 6/1/90";
                     28: #endif /* not lint */
                     29: 
                     30: /*
                     31:  * The top level of the daemon, the format is heavily borrowed
                     32:  * from rwhod.c. Basically: find out who and where you are; 
                     33:  * disconnect all descriptors and ttys, and then endless
                     34:  * loop on waiting for and processing requests
                     35:  */
                     36: #include <stdio.h>
                     37: #include <errno.h>
                     38: #include <signal.h>
                     39: #include <syslog.h>
                     40: 
                     41: #include <protocols/talkd.h>
                     42: #include <paths.h>
                     43: 
                     44: CTL_MSG                request;
                     45: CTL_RESPONSE   response;
                     46: 
                     47: int    sockt;
                     48: int    debug = 0;
                     49: int    timeout();
                     50: long   lastmsgtime;
                     51: 
                     52: char   hostname[32];
                     53: 
                     54: #define TIMEOUT 30
                     55: #define MAXIDLE 120
                     56: 
                     57: main(argc, argv)
                     58:        int argc;
                     59:        char *argv[];
                     60: {
                     61:        register CTL_MSG *mp = &request;
                     62:        int cc;
                     63: 
                     64:        if (getuid()) {
                     65:                fprintf(stderr, "%s: getuid: not super-user", argv[0]);
                     66:                exit(1);
                     67:        }
                     68:        openlog("talkd", LOG_PID, LOG_DAEMON);
                     69:        if (gethostname(hostname, sizeof (hostname) - 1) < 0) {
                     70:                syslog(LOG_ERR, "gethostname: %m");
                     71:                _exit(1);
                     72:        }
                     73:        if (chdir(_PATH_DEV) < 0) {
                     74:                syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
                     75:                _exit(1);
                     76:        }
                     77:        if (argc > 1 && strcmp(argv[1], "-d") == 0)
                     78:                debug = 1;
                     79:        signal(SIGALRM, timeout);
                     80:        alarm(TIMEOUT);
                     81:        for (;;) {
                     82:                extern int errno;
                     83: 
                     84:                cc = recv(0, (char *)mp, sizeof (*mp), 0);
                     85:                if (cc != sizeof (*mp)) {
                     86:                        if (cc < 0 && errno != EINTR)
                     87:                                syslog(LOG_WARNING, "recv: %m");
                     88:                        continue;
                     89:                }
                     90:                lastmsgtime = time(0);
                     91:                process_request(mp, &response);
                     92:                /* can block here, is this what I want? */
                     93:                cc = sendto(sockt, (char *)&response,
                     94:                    sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr,
                     95:                    sizeof (mp->ctl_addr));
                     96:                if (cc != sizeof (response))
                     97:                        syslog(LOG_WARNING, "sendto: %m");
                     98:        }
                     99: }
                    100: 
                    101: timeout()
                    102: {
                    103: 
                    104:        if (time(0) - lastmsgtime >= MAXIDLE)
                    105:                _exit(0);
                    106:        alarm(TIMEOUT);
                    107: }

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