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