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Annotation of 43BSDReno/games/hunt/NEW/get_names.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: #include "bsd.h"
        !             8: 
        !             9: #if    defined(TALK_43) || defined(TALK_42)
        !            10: 
        !            11: # include      <stdio.h>
        !            12: # include      "talk_ctl.h"
        !            13: # include      <sys/param.h>
        !            14: # include      <netdb.h>
        !            15: 
        !            16: extern char    *rindex(), *strncpy();
        !            17: 
        !            18: extern CTL_MSG msg;
        !            19: 
        !            20: struct hostent *gethostbyname();
        !            21: struct servent *getservbyname();
        !            22: 
        !            23: static char    hostname[MAXHOSTNAMELEN];
        !            24: char           *my_machine_name;
        !            25: 
        !            26: /*
        !            27:  * Determine the local user and machine
        !            28:  */
        !            29: get_local_name(my_name)
        !            30:        char    *my_name;
        !            31: {
        !            32:        struct  hostent *hp;
        !            33:        struct  servent *sp;
        !            34: 
        !            35:        /* Load these useful values into the standard message header */
        !            36:        msg.id_num = 0;
        !            37:        (void) strncpy(msg.l_name, my_name, NAME_SIZE);
        !            38:        msg.l_name[NAME_SIZE - 1] = '\0';
        !            39:        msg.r_tty[0] = '\0';
        !            40:        msg.pid = getpid();
        !            41: # ifdef TALK_43
        !            42:        msg.vers = TALK_VERSION;
        !            43:        msg.addr.sa_family = htons(AF_INET);
        !            44:        msg.ctl_addr.sa_family = htons(AF_INET);
        !            45: # else
        !            46:        msg.addr.sin_family = htons(AF_INET);
        !            47:        msg.ctl_addr.sin_family = htons(AF_INET);
        !            48: # endif
        !            49: 
        !            50:        (void) gethostname(hostname, sizeof (hostname));
        !            51:        my_machine_name = hostname;
        !            52:        /* look up the address of the local host */
        !            53:        hp = gethostbyname(my_machine_name);
        !            54:        if (hp == (struct hostent *) 0) {
        !            55:                printf("This machine doesn't exist. Boy, am I confused!\n");
        !            56:                exit(-1);
        !            57:        }
        !            58:        bcopy(hp->h_addr, (char *) &my_machine_addr, hp->h_length);
        !            59:        /* find the daemon portal */
        !            60: # ifdef TALK_43
        !            61:        sp = getservbyname("ntalk", "udp");
        !            62: # else
        !            63:        sp = getservbyname("talk", "udp");
        !            64: # endif
        !            65:        if (sp == 0) {
        !            66: # ifdef LOG
        !            67:                syslog(LOG_ERR, "This machine doesn't support talk");
        !            68: # else
        !            69:                perror("This machine doesn't support talk");
        !            70: # endif
        !            71:                exit(-1);
        !            72:        }
        !            73:        daemon_port = sp->s_port;
        !            74: }
        !            75: 
        !            76: /*
        !            77:  * Determine the remote user and machine
        !            78:  */
        !            79: get_remote_name(his_address)
        !            80:        char    *his_address;
        !            81: {
        !            82:        char            *his_name;
        !            83:        char            *his_machine_name;
        !            84:        char            *ptr;
        !            85:        struct  hostent *hp;
        !            86: 
        !            87: 
        !            88:        /* check for, and strip out, the machine name of the target */
        !            89:        for (ptr = his_address; *ptr != '\0' && *ptr != '@' && *ptr != ':'
        !            90:                                        && *ptr != '!' && *ptr != '.'; ptr++)
        !            91:                continue;
        !            92:        if (*ptr == '\0') {
        !            93:                /* this is a local to local talk */
        !            94:                his_name = his_address;
        !            95:                his_machine_name = my_machine_name;
        !            96:        } else {
        !            97:                if (*ptr == '@') {
        !            98:                        /* user@host */
        !            99:                        his_name = his_address;
        !           100:                        his_machine_name = ptr + 1;
        !           101:                } else {
        !           102:                        /* host.user or host!user or host:user */
        !           103:                        his_name = ptr + 1;
        !           104:                        his_machine_name = his_address;
        !           105:                }
        !           106:                *ptr = '\0';
        !           107:        }
        !           108:        /* Load these useful values into the standard message header */
        !           109:        (void) strncpy(msg.r_name, his_name, NAME_SIZE);
        !           110:        msg.r_name[NAME_SIZE - 1] = '\0';
        !           111: 
        !           112:        /* if he is on the same machine, then simply copy */
        !           113:        if (bcmp((char *) &his_machine_name, (char *) &my_machine_name,
        !           114:                                                sizeof(his_machine_name)) == 0)
        !           115:                bcopy((char *) &my_machine_addr, (char *) &his_machine_addr,
        !           116:                                                sizeof(his_machine_name));
        !           117:        else {
        !           118:                /* look up the address of the recipient's machine */
        !           119:                hp = gethostbyname(his_machine_name);
        !           120:                if (hp == (struct hostent *) 0)
        !           121:                        return 0;                       /* unknown host */
        !           122:                bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
        !           123:        }
        !           124:        return 1;
        !           125: }
        !           126: #endif

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