/* ARPA.C

 * 

 * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 */

/*

 * Implementation of the ARPA/INET.H functions, based on FreeBSD.

 */

/*

 * Copyright (c) 1983, 1993

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

 *

 * 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.

 * Portions Copyright (c) 1993 by Digital Equipment Corporation.

 * 

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies, and that

 * the name of Digital Equipment Corporation not be used in advertising or

 * publicity pertaining to distribution of the document or software without

 * specific, written prior permission.

 * 

 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL

 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT

 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 * -

 * --Copyright--

 */

#include <stdio_r.h>

#include <netdb_r.h>

#include <ctype.h>

#include <sys/types.h>

#include <libc/netinet/in.h>

#include <libc/arpa/inet.h>

/**

Ascii internet address interpretation routine.

@return The value returned is in network order.

@param cp ascii representation of an Internet address

*/

EXPORT_C unsigned long inet_addr(const char *cp)

{

        struct in_addr val;

        if (inet_aton(cp, &val))

                return (val.s_addr);

        return (INADDR_NONE);

}

/**

Check whether "cp" is a valid ascii representation

of an Internet address and convert to a binary address.

This replaces inet_addr, the return value from which

cannot distinguish between failure and a local broadcast address.

@return 1 if the address is valid, 0 if not.

@param cp ascii representation of an Internet address

@param addr internet address

*/

EXPORT_C int inet_aton(const char* cp, struct in_addr* addr)

{

        unsigned long val;

        int base, n;

        char c;

        unsigned int parts[4];

        unsigned int *pp = parts;

        c = *cp;

        for (;;) {

                /*

                 * Collect number up to ``.''.

                 * Values are specified as for C:

                 * 0x=hex, 0=octal, isdigit=decimal.

                 */

                if (!isdigit(c))

                        return (0);

                val = 0; base = 10;

                if (c == '0') {

                        c = *++cp;

                        if (c == 'x' || c == 'X')

                                base = 16, c = *++cp;

                        else

                                base = 8;

                }

                for (;;) {

                        if (isascii(c) && isdigit(c)) {

                                val = (val * base) + (c - '0');

                                c = *++cp;

                        } else if (base == 16 && isascii(c) && isxdigit(c)) {

                                val = (val << 4) |

                                        (c + 10 - (islower(c) ? 'a' : 'A'));

                                c = *++cp;

                        } else

                                break;

                }

                if (c == '.') {

                        /*

                         * Internet format:

                         *      a.b.c.d

                         *      a.b.c   (with c treated as 16 bits)

                         *      a.b     (with b treated as 24 bits)

                         */

                        if (pp >= parts + 3)

                                return (0);

		                if (val > 0xff) /* Check 8-bit a, b, c */

		                        return (0);

                        *pp++ = val;

                        c = *++cp;

                } else

                        break;

        }

        /*

         * Check for trailing characters.

         */

        if (c != '\0' && (!isascii(c) || !isspace(c)))

                return (0);

        /*

         * Concoct the address according to

         * the number of parts specified.

         */

        n = pp - parts + 1;

        switch (n) {

        case 0:

                return (0);             /* initial nondigit */

        case 1:                         /* a -- 32 bits */

                break;

        case 2:                         /* a.b -- 8.24 bits */

                if (val > 0xffffff)

                        return (0);

                val |= parts[0] << 24;

                break;

        case 3:                         /* a.b.c -- 8.8.16 bits */

                if (val > 0xffff)

                        return (0);

                val |= (parts[0] << 24) | (parts[1] << 16);

                break;

        case 4:                         /* a.b.c.d -- 8.8.8.8 bits */

                if (val > 0xff)

                        return (0);

                val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);

                break;

        }

        if (addr)

                addr->s_addr = htonl(val);

        return (1);

}

/*

 * Convert network-format internet address

 * to base 256 d.d.d.d representation.

 */

EXPORT_C char* _inet_ntoa_r(struct _reent* rp, struct in_addr in)

{

        unsigned char* p = (unsigned char *)∈

        _sprintf_r(rp, rp->_tmpnam, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);

        return rp->_tmpnam;

}

#ifndef _REENT_ONLY

EXPORT_C char* inet_ntoa(struct in_addr in)

{

	return _inet_ntoa_r(_REENT,in);

}

#endif /* _REENT_ONLY */

/**

Return the local network address portion of an

internet address; handles class a/b/c network

number formats.

@return the local network address portion of an

internet address

@param in 

*/ 

EXPORT_C unsigned long inet_lnaof(struct in_addr in)

{

        register unsigned long i = ntohl(in.s_addr);

        if (IN_CLASSA(i))

                return ((i)&IN_CLASSA_HOST);

        else if (IN_CLASSB(i))

                return ((i)&IN_CLASSB_HOST);

        else

                return ((i)&IN_CLASSC_HOST);

}

/**

@return the network number from an internet

address; handles class a/b/c network #'s.

@param in

*/

EXPORT_C unsigned long inet_netof(struct in_addr in)

{

        unsigned long i = ntohl(in.s_addr);

        if (IN_CLASSA(i))

                return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);

        else if (IN_CLASSB(i))

                return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);

        else

                return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);

}

/** Formulate an Internet address from network + host.

*/

EXPORT_C struct in_addr inet_makeaddr(unsigned long net, unsigned long host)

{

        unsigned long addr;

        if (net < IN_CLASSA_MAX)

                addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);

        else if (net < IN_CLASSB_MAX)

                addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);

        else if (net < IN_CLASSC_MAX)

                addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);

        else

                addr = net | host;

        addr = htonl(addr);

        return (*(struct in_addr *)&addr);

}