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/*

 * ++Copyright++ 1985, 1988, 1993

 * -

 * Copyright (c) 1985, 1988, 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[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";

static char rcsid[] = "$Id: map_v4v6.c,v 1.2 2001-09-27 12:01:53 chris Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/param.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <arpa/nameser.h>

#include <stdio.h>

#include <string.h>

#include <netdb.h>

#include <resolv.h>

#include <ctype.h>

#include <errno.h>

#include <syslog.h>

typedef union {

        int32_t al;

        char ac;

} align;

void

_map_v4v6_address(src, dst)

        const char *src;

        char *dst;

{

        u_char *p = (u_char *)dst;

        char tmp[INADDRSZ];

        int i;

        /* Stash a temporary copy so our caller can update in place. */

        bcopy(src, tmp, INADDRSZ);

        /* Mark this ipv6 addr as a mapped ipv4. */

        for (i = 0; i < 10; i++)

                *p++ = 0x00;

        *p++ = 0xff;

        *p++ = 0xff;

        /* Retrieve the saved copy and we're done. */

        bcopy(tmp, (void*)p, INADDRSZ);

}

void

_map_v4v6_hostent(hp, bpp, lenp)

        struct hostent *hp;

        char **bpp;

        int *lenp;

{

        char **ap;

        if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)

                return;

        hp->h_addrtype = AF_INET6;

        hp->h_length = IN6ADDRSZ;

        for (ap = hp->h_addr_list; *ap; ap++) {

                int i = sizeof(align) - ((u_long)*bpp % sizeof(align));

                if (*lenp < (i + IN6ADDRSZ)) {

                        /* Out of memory.  Truncate address list here.  XXX */

                        *ap = NULL;

                        return;

                }

                *bpp += i;

                *lenp -= i;

                _map_v4v6_address(*ap, *bpp);

                *ap = *bpp;

                *bpp += IN6ADDRSZ;

                *lenp -= IN6ADDRSZ;

        }

}