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Annotation of 43BSD/contrib/xns/xnslib/names.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * This file implements functions for dealing with names in the XNS
        !             3:  * environment.
        !             4:  */
        !             5: 
        !             6: /*
        !             7:  $Log: names.c,v $
        !             8:  * Revision 2.0  85/11/21  07:22:14  jqj
        !             9:  * 4.3BSD standard release
        !            10:  * 
        !            11:  * Revision 1.2  85/10/21  12:58:41  root
        !            12:  * Gould version:  eliminate various uses of ns_netof(), which doesn't
        !            13:  * work on Gould.
        !            14:  * 
        !            15:  * Revision 1.1  85/10/17  10:13:45  bill
        !            16:  * Initial revision
        !            17:  * 
        !            18:  * Revision 1.3  85/03/11  16:37:13  jqj
        !            19:  * Public alpha-test version, released 11 March 1985
        !            20:  * 
        !            21:  * Revision 1.2  85/01/27  07:37:32  jqj
        !            22:  * finished but undebugged version
        !            23:  * 
        !            24:  */
        !            25: 
        !            26: #ifndef lint
        !            27: static char rcsid[] = "$Header: names.c,v 2.0 85/11/21 07:22:14 jqj Exp $";
        !            28: #endif
        !            29: 
        !            30: #include <stdio.h>
        !            31: #include <sys/types.h>         /* for ns.h and socket.h */
        !            32: #include <sys/socket.h>                /* for ns.h */
        !            33: #include <netns/ns.h>          /* for XNS addresses */
        !            34: #include <netdb.h>
        !            35: 
        !            36: 
        !            37: 
        !            38: /*ARGSUSED*/
        !            39: struct ns_addr *
        !            40: ClearinghouseLookup(name,field)
        !            41:        char *name, *field;
        !            42: {
        !            43:        /* not yet implemented */
        !            44:        return(NULL);
        !            45: }
        !            46: 
        !            47: struct ns_addr *
        !            48: getXNSaddr(name)
        !            49:        char *name;
        !            50: {
        !            51:        static struct ns_addr addr;
        !            52:        long net,net1;
        !            53:        int i;
        !            54:        int hb[6];
        !            55:        u_short socket;
        !            56:        char *netname, *hostname, *socketname;
        !            57:        extern char *index();
        !            58: 
        !            59:        netname = name;
        !            60:        if (NULL == (hostname = index(name,'#'))) {
        !            61:                /* no # means just a host name */
        !            62:                netname = "0"; hostname = name; socketname = "0";
        !            63:        }
        !            64:        else if (NULL == (socketname = index(++hostname,'#')))
        !            65:                /* one # means net#host */
        !            66:                socketname = "0";
        !            67:        else
        !            68:                /* two # means net#host#socket */
        !            69:                socketname += 1;
        !            70: 
        !            71:        *(u_long *)&addr.x_net = 0;
        !            72:        for (i = 0; i < 6; i++)
        !            73:                addr.x_host.c_host[i] = (char) 0;
        !            74:        addr.x_port = 0;
        !            75:        /*
        !            76:         * first try 2-273#2-852-151-014#socket
        !            77:         */
        !            78:        if (1 < (i = sscanf(hostname,"%d-%d-%d-%d-%d#",
        !            79:                        &hb[0], &hb[1], &hb[2], &hb[3], &hb[4]))) {
        !            80:                cvtbase(1000,256,hb,i,addr.x_host.c_host,6);
        !            81:                i = sscanf(netname,"%ld-%ld#", &net, &net1);
        !            82:                if (i > 1)
        !            83:                        net = net*1000+net1;
        !            84:                i = sscanf(socketname,"%hd", &socket);
        !            85:                *(u_long *)&addr.x_net = htonl(net);
        !            86:                addr.x_port = htons(socket);
        !            87:                return(&addr);
        !            88:        }
        !            89:        /*
        !            90:         * try form 8E1#0.0.AA.0.5E.E6#socket
        !            91:         */
        !            92:        else if (1 < (i = sscanf(hostname,"%x.%x.%x.%x.%x.%x",
        !            93:                        &hb[0], &hb[1], &hb[2], &hb[3], &hb[4], &hb[5]))) {
        !            94:                cvtbase(256,256,hb,i,addr.x_host.c_host,6);
        !            95:                i = sscanf(netname,"%lx", &net);
        !            96:                i = sscanf(socketname,"%hx", &socket);
        !            97:                *(u_long *)&addr.x_net = htonl(net);
        !            98:                addr.x_port = htons(socket);
        !            99:                return(&addr);
        !           100:        }
        !           101:        /* code for alternate forms here */
        !           102:        return(NULL);   /* no match */
        !           103: }
        !           104: 
        !           105: static
        !           106: cvtbase(oldbase,newbase,input,inlen,result,reslen)
        !           107:        int oldbase, newbase;
        !           108:        int input[];
        !           109:        int inlen;
        !           110:        unsigned char result[];
        !           111:        int reslen;
        !           112: {
        !           113:        int d, e;
        !           114:        long sum;
        !           115: 
        !           116:        e = 1;
        !           117:        while (e > 0 && reslen > 0) {
        !           118:                d = 0; e = 0; sum = 0;
        !           119:                /* long division: input=input/newbase */
        !           120:                while (d < inlen) {
        !           121:                        sum = sum*oldbase + (long) input[d];
        !           122:                        e += (sum > 0);
        !           123:                        input[d++] = sum / newbase;
        !           124:                        sum %= newbase;
        !           125:                }
        !           126:                result[--reslen] = sum; /* accumulate remainder */
        !           127:        }
        !           128:        for (d=0; d < reslen; d++)
        !           129:                result[d] = 0;
        !           130: }
        !           131: 
        !           132: 
        !           133: /*ARGSUSED*/
        !           134: struct hostent *
        !           135: getXNShostbyname (name)
        !           136:        char *name;
        !           137: {
        !           138: /* can't use gethostent() since only internet addresses are understood */
        !           139:        return(NULL);
        !           140: }
        !           141: 
        !           142: 
        !           143: 
        !           144: struct ns_addr *
        !           145: CourierName( name )
        !           146:        char *name;
        !           147: {
        !           148:        struct hostent *haddr;
        !           149:        struct ns_addr *paddr;
        !           150: 
        !           151:                                        /* first, try an explicit address */
        !           152:                                        /* like 3#1.2.3.4.5.6#5 */
        !           153:        if ((paddr = getXNSaddr(name)) != NULL)
        !           154:                return(paddr);
        !           155:                                        /* second, try a local cache lookup */
        !           156:        if ((haddr = getXNShostbyname(name)) != NULL) {
        !           157:                return((struct ns_addr*) haddr->h_addr);
        !           158:        }
        !           159:                                        /* finally, try a nonlocal lookup */
        !           160:        return( ClearinghouseLookup(name,(char*)NULL) );
        !           161: }

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