gen.subproj/map_v4v6.c

   1 /*
   2  * ++Copyright++ 1985, 1988, 1993
   3  * -
   4  * Copyright (c) 1985, 1988, 1993
   5  *    The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  * -
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  * -
  53  * --Copyright--
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char sccsid[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";
  58 static char rcsid[] = "$FreeBSD: src/lib/libc/net/map_v4v6.c,v 1.5.2.1 2001/03/05 10:47:08 obrien Exp $";
  59 #endif /* LIBC_SCCS and not lint */
  60
  61 #include <sys/types.h>
  62 #include <sys/param.h>
  63 #include <sys/socket.h>
  64 #include <netinet/in.h>
  65 #include <arpa/inet.h>
  66
  67 #include <arpa/nameser_compat.h>
  68 #include <nameser.h>
  69
  70 #include <stdio.h>
  71 #include <string.h>
  72 #include <netdb.h>
  73 #include <ctype.h>
  74 #include <syslog.h>
  75
  76 typedef union {
  77         int32_t al;
  78         char ac;
  79 } align;
  80
  81 void
  82 _map_v4v6_address(src, dst)
  83         const char *src;
  84         char *dst;
  85 {
  86         u_char *p = (u_char *)dst;
  87         char tmp[INADDRSZ];
  88         int i;
  89
  90         /* Stash a temporary copy so our caller can update in place. */
  91         bcopy(src, tmp, INADDRSZ);
  92         /* Mark this ipv6 addr as a mapped ipv4. */
  93         for (i = 0; i < 10; i++)
  94                 *p++ = 0x00;
  95         *p++ = 0xff;
  96         *p++ = 0xff;
  97         /* Retrieve the saved copy and we're done. */
  98         bcopy(tmp, (void*)p, INADDRSZ);
  99 }
 100
 101 void
 102 _map_v4v6_hostent(hp, bpp, lenp)
 103         struct hostent *hp;
 104         char **bpp;
 105         int *lenp;
 106 {
 107         char **ap;
 108
 109         if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
 110                 return;
 111         hp->h_addrtype = AF_INET6;
 112         hp->h_length = IN6ADDRSZ;
 113         for (ap = hp->h_addr_list; *ap; ap++) {
 114                 int i = sizeof(align) - ((u_long)*bpp % sizeof(align));
 115
 116                 if (*lenp < (i + IN6ADDRSZ)) {
 117                         /* Out of memory.  Truncate address list here.  XXX */
 118                         *ap = NULL;
 119                         return;
 120                 }
 121                 *bpp += i;
 122                 *lenp -= i;
 123                 _map_v4v6_address(*ap, *bpp);
 124                 *ap = *bpp;
 125                 *bpp += IN6ADDRSZ;
 126                 *lenp -= IN6ADDRSZ;
 127         }
 128 }