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/*

 * Copyright (c) 1986, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * J.Q. Johnson.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *  $Id: ns_addr.c,v 1.2 2001-09-27 12:01:53 chris Exp $

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)ns_addr.c   8.1 (Berkeley) 6/7/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>

#include <netns/ns.h>

#include <stdio.h>

#include <string.h>

static struct ns_addr addr, zero_addr;

static void Field(), cvtbase();

struct ns_addr

ns_addr(name)

        const char *name;

{

        char separator;

        char *hostname, *socketname, *cp;

        char buf[50];

        (void)strncpy(buf, name, sizeof(buf) - 1);

        buf[sizeof(buf) - 1] = '\0';

        /*

         * First, figure out what he intends as a field separtor.

         * Despite the way this routine is written, the prefered

         * form  2-272.AA001234H.01777, i.e. XDE standard.

         * Great efforts are made to insure backward compatability.

         */

        if ((hostname = strchr(buf, '#')) != NULL)

                separator = '#';

        else {

                hostname = strchr(buf, '.');

                if ((cp = strchr(buf, ':')) &&

                    ((hostname && cp < hostname) || (hostname == 0))) {

                        hostname = cp;

                        separator = ':';

                } else

                        separator = '.';

        }

        if (hostname)

                *hostname++ = 0;

        addr = zero_addr;

        Field(buf, addr.x_net.c_net, 4);

        if (hostname == 0)

                return (addr);  /* No separator means net only */

        socketname = strchr(hostname, separator);

        if (socketname) {

                *socketname++ = 0;

                Field(socketname, (u_char *)&addr.x_port, 2);

        }

        Field(hostname, addr.x_host.c_host, 6);

        return (addr);

}

static void

Field(buf, out, len)

        char *buf;

        u_char *out;

        int len;

{

        register char *bp = buf;

        int i, ibase, base16 = 0, base10 = 0, clen = 0;

        int hb[6], *hp;

        char *fmt;

        /*

         * first try 2-273#2-852-151-014#socket

         */

        if ((*buf != '-') &&

            (1 < (i = sscanf(buf, "%d-%d-%d-%d-%d",

                        &hb[0], &hb[1], &hb[2], &hb[3], &hb[4])))) {

                cvtbase(1000L, 256, hb, i, out, len);

                return;

        }

        /*

         * try form 8E1#0.0.AA.0.5E.E6#socket

         */

        if (1 < (i = sscanf(buf,"%x.%x.%x.%x.%x.%x",

                        &hb[0], &hb[1], &hb[2], &hb[3], &hb[4], &hb[5]))) {

                cvtbase(256L, 256, hb, i, out, len);

                return;

        }

        /*

         * try form 8E1#0:0:AA:0:5E:E6#socket

         */

        if (1 < (i = sscanf(buf,"%x:%x:%x:%x:%x:%x",

                        &hb[0], &hb[1], &hb[2], &hb[3], &hb[4], &hb[5]))) {

                cvtbase(256L, 256, hb, i, out, len);

                return;

        }

        /*

         * This is REALLY stretching it but there was a

         * comma notation separting shorts -- definitely non standard

         */

        if (1 < (i = sscanf(buf,"%x,%x,%x",

                        &hb[0], &hb[1], &hb[2]))) {

                hb[0] = htons(hb[0]); hb[1] = htons(hb[1]);

                hb[2] = htons(hb[2]);

                cvtbase(65536L, 256, hb, i, out, len);

                return;

        }

        /* Need to decide if base 10, 16 or 8 */

        while (*bp) switch (*bp++) {

        case '0': case '1': case '2': case '3': case '4': case '5':

        case '6': case '7': case '-':

                break;

        case '8': case '9':

                base10 = 1;

                break;

        case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':

        case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':

                base16 = 1;

                break;

        case 'x': case 'X':

                *--bp = '0';

                base16 = 1;

                break;

        case 'h': case 'H':

                base16 = 1;

                /* fall into */

        default:

                *--bp = 0; /* Ends Loop */

        }

        if (base16) {

                fmt = "%3x";

                ibase = 4096;

        } else if (base10 == 0 && *buf == '0') {

                fmt = "%3o";

                ibase = 512;

        } else {

                fmt = "%3d";

                ibase = 1000;

        }

        for (bp = buf; *bp++; ) clen++;

        if (clen == 0) clen++;

        if (clen > 18) clen = 18;

        i = ((clen - 1) / 3) + 1;

        bp = clen + buf - 3;

        hp = hb + i - 1;

        while (hp > hb) {

                (void)sscanf(bp, fmt, hp);

                bp[0] = 0;

                hp--;

                bp -= 3;

        }

        (void)sscanf(buf, fmt, hp);

        cvtbase((long)ibase, 256, hb, i, out, len);

}

static void

cvtbase(oldbase,newbase,input,inlen,result,reslen)

        long oldbase;

        int newbase;

        int input[];

        int inlen;

        unsigned char result[];

        int reslen;

{

        int d, e;

        long sum;

        e = 1;

        while (e > 0 && reslen > 0) {

                d = 0; e = 0; sum = 0;

                /* long division: input=input/newbase */

                while (d < inlen) {

                        sum = sum*oldbase + (long) input[d];

                        e += (sum > 0);

                        input[d++] = sum / newbase;

                        sum %= newbase;

                }

                result[--reslen] = sum; /* accumulate remainder */

        }

        for (d=0; d < reslen; d++)

                result[d] = 0;

}