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/*      $KAME: inet_addr.c,v 1.5 2001/08/20 02:32:40 itojun Exp $       */

/*

 * ++Copyright++ 1983, 1990, 1993

 * -

 * Copyright (c) 1983, 1990, 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--

 */

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

static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

#include <sys/types.h>

#include <machine/endian.h>

#include <sys/param.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <ctype.h>

#include <errno.h>

#include <string.h>

#include <stdlib.h>

/*

 * ASCII internet address interpretation routine.

 * The value returned is in network order.

 */

in_addr_t               /* XXX should be struct in_addr :( */

inet_addr(cp)

        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.

 * Returns 1 if the address is valid, 0 if not.

 * This replaces inet_addr, the return value from which

 * cannot distinguish between failure and a local broadcast address.

 */

int

inet_aton(cp, addr)

        const char *cp;

        struct in_addr *addr;

{

        u_long parts[4];

        in_addr_t val;

        char *c;

        char *endptr;

        int gotend, n;

        c = (char *)cp;

        n = 0;

        /*

         * Run through the string, grabbing numbers until

         * the end of the string, or some error

         */

        gotend = 0;

        while (!gotend) {

                errno = 0;

                val = strtoul(c, &endptr, 0);

                if (errno == ERANGE)    /* Fail completely if it overflowed. */

                        return (0);

                /*

                 * If the whole string is invalid, endptr will equal

                 * c.. this way we can make sure someone hasn't

                 * gone '.12' or something which would get past

                 * the next check.

                 */

                if (endptr == c)

                        return (0);

                parts[n] = val;

                c = endptr;

                /* Check the next character past the previous number's end */

                switch (*c) {

                case '.' :

                        /* Make sure we only do 3 dots .. */

                        if (n == 3)     /* Whoops. Quit. */

                                return (0);

                        n++;

                        c++;

                        break;

                case '\0':

                        gotend = 1;

                        break;

                default:

                        if (isspace((unsigned char)*c)) {

                                gotend = 1;

                                break;

                        } else

                                return (0);      /* Invalid character, so fail */

                }

        }

        /*

         * Concoct the address according to

         * the number of parts specified.

         */

        switch (n) {

        case 0:                          /* a -- 32 bits */

                /*

                 * Nothing is necessary here.  Overflow checking was

                 * already done in strtoul().

                 */

                break;

        case 1:                         /* a.b -- 8.24 bits */

                if (val > 0xffffff || parts[0] > 0xff)

                        return (0);

                val |= parts[0] << 24;

                break;

        case 2:                         /* a.b.c -- 8.8.16 bits */

                if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)

                        return (0);

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

                break;

        case 3:                         /* a.b.c.d -- 8.8.8.8 bits */

                if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||

                    parts[2] > 0xff)

                        return (0);

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

                break;

        }

        if (addr != NULL)

                addr->s_addr = htonl(val);

        return (1);

}

/*

 * Weak aliases for applications that use certain private entry points,

 * and fail to include <arpa/inet.h>.

 */

#undef inet_addr

__weak_reference(__inet_addr, inet_addr);

#undef inet_aton

__weak_reference(__inet_aton, inet_aton);