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Annotation of 43BSDReno/old/talk/talkd/talkd.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: char copyright[] =
        !             9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
        !            10:  All rights reserved.\n";
        !            11: #endif not lint
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)talkd.c    5.1 (Berkeley) 6/6/85";
        !            15: #endif not lint
        !            16: 
        !            17: /*
        !            18:  * The top level of the daemon, the format is heavily borrowed
        !            19:  * from rwhod.c. Basically: find out who and where you are; 
        !            20:  * disconnect all descriptors and ttys, and then endless
        !            21:  * loop on waiting for and processing requests
        !            22:  */
        !            23: #include <stdio.h>
        !            24: #include <errno.h>
        !            25: #include <signal.h>
        !            26: 
        !            27: #include "ctl.h"
        !            28: 
        !            29: struct sockaddr_in sin = { AF_INET };
        !            30: 
        !            31: CTL_MSG                request;
        !            32: CTL_RESPONSE   response;
        !            33: 
        !            34: int    sockt;
        !            35: int    debug = 0;
        !            36: FILE   *debugout;
        !            37: int    timeout();
        !            38: long   lastmsgtime;
        !            39: 
        !            40: char   hostname[32];
        !            41: 
        !            42: #define TIMEOUT 30
        !            43: #define MAXIDLE 120
        !            44: 
        !            45: main(argc, argv)
        !            46:        int argc;
        !            47:        char *argv[];
        !            48: {
        !            49:        struct sockaddr_in from;
        !            50:        int fromlen, cc;
        !            51:        
        !            52:        if (debug)
        !            53:                debugout = (FILE *)fopen ("/usr/tmp/talkd.msgs", "w");
        !            54: 
        !            55:        if (getuid()) {
        !            56:                fprintf(stderr, "Talkd : not super user\n");
        !            57:                exit(1);
        !            58:        }
        !            59:        gethostname(hostname, sizeof (hostname));
        !            60:        (void) chdir("/dev");
        !            61:        signal(SIGALRM, timeout);
        !            62:        alarm(TIMEOUT);
        !            63:        for (;;) {
        !            64:                extern int errno;
        !            65: 
        !            66:                fromlen = sizeof(from);
        !            67:                cc = recvfrom(0, (char *)&request, sizeof (request), 0,
        !            68:                    &from, &fromlen);
        !            69:                if (cc != sizeof(request)) {
        !            70:                        if (cc < 0 && errno != EINTR)
        !            71:                        perror("recvfrom");
        !            72:                        continue;
        !            73:                }
        !            74:                lastmsgtime = time(0);
        !            75:                swapmsg(&request);
        !            76:                if (debug) print_request(&request);
        !            77:                process_request(&request, &response);
        !            78:                /* can block here, is this what I want? */
        !            79:                cc = sendto(sockt, (char *) &response,
        !            80:                    sizeof (response), 0, &request.ctl_addr,
        !            81:                    sizeof (request.ctl_addr));
        !            82:                if (cc != sizeof(response))
        !            83:                        perror("sendto");
        !            84:        }
        !            85: }
        !            86: 
        !            87: timeout()
        !            88: {
        !            89: 
        !            90:        if (time(0) - lastmsgtime >= MAXIDLE)
        !            91:                exit(0);
        !            92:        alarm(TIMEOUT);
        !            93: }
        !            94: 
        !            95: /*  
        !            96:  * heuristic to detect if need to swap bytes
        !            97:  */
        !            98: 
        !            99: swapmsg(req)
        !           100:        CTL_MSG *req;
        !           101: {
        !           102:        if (req->ctl_addr.sin_family == ntohs(AF_INET)) {
        !           103:                req->id_num = ntohl(req->id_num);
        !           104:                req->pid = ntohl(req->pid);
        !           105:                req->addr.sin_family = ntohs(req->addr.sin_family);
        !           106:                req->ctl_addr.sin_family =
        !           107:                        ntohs(req->ctl_addr.sin_family);
        !           108:        }
        !           109: }

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