StdLib/BsdSocketLib/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  * Portions copyright (c) 1999, 2000
   8  * Intel Corporation.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  *
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  *
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *
  25  *    This product includes software developed by the University of
  26  *    California, Berkeley, Intel Corporation, and its contributors.
  27  *
  28  * 4. Neither the name of University, Intel Corporation, or their respective
  29  *    contributors may be used to endorse or promote products derived from
  30  *    this software without specific prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
  33  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  34  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
  36  * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  37  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  38  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  39  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  40  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  41  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  42  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  43  * -
  44  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  45  *
  46  * Permission to use, copy, modify, and distribute this software for any
  47  * purpose with or without fee is hereby granted, provided that the above
  48  * copyright notice and this permission notice appear in all copies, and that
  49  * the name of Digital Equipment Corporation not be used in advertising or
  50  * publicity pertaining to distribution of the document or software without
  51  * specific, written prior permission.
  52  *
  53  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  54  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  55  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  56  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  57  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  58  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  59  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  60  * SOFTWARE.
  61  * -
  62  * --Copyright--
  63  */
  64
  65 #if defined(LIBC_SCCS) && !defined(lint)
  66 static char sccsid[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";
  67 static char rcsid[] = "$Id: map_v4v6.c,v 1.1.1.1 2003/11/19 01:51:31 kyu3 Exp $";
  68 #endif /* LIBC_SCCS and not lint */
  69
  70 #include <sys/types.h>
  71 #include <sys/param.h>
  72 #include <sys/socket.h>
  73 #include <netinet/in.h>
  74 #include <arpa/inet.h>
  75 #include <arpa/nameser.h>
  76
  77 #include <stdio.h>
  78 #include <string.h>
  79 #include <netdb.h>
  80 #include <resolv.h>
  81 #include <ctype.h>
  82 #include <errno.h>
  83 #ifdef _ORG_FREEBSD_
  84 #include <syslog.h>
  85 #endif
  86 #include "Socklib_internals.h"
  87
  88 typedef union {
  89         int32_t al;
  90         char ac;
  91 } align;
  92
  93 void
  94 _map_v4v6_address(const char *src, char *dst)
  95 {
  96         u_char *p = (u_char *)dst;
  97         char tmp[INADDRSZ];
  98         int i;
  99
 100         /* Stash a temporary copy so our caller can update in place. */
 101         bcopy(src, tmp, INADDRSZ);
 102         /* Mark this ipv6 addr as a mapped ipv4. */
 103         for (i = 0; i < 10; i++)
 104                 *p++ = 0x00;
 105         *p++ = 0xff;
 106         *p++ = 0xff;
 107         /* Retrieve the saved copy and we're done. */
 108         bcopy(tmp, (void*)p, INADDRSZ);
 109 }
 110
 111 void
 112 _map_v4v6_hostent(struct hostent *hp, char **bpp, int *lenp)
 113 {
 114         char **ap;
 115
 116         if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
 117                 return;
 118         hp->h_addrtype = AF_INET6;
 119         hp->h_length = IN6ADDRSZ;
 120         for (ap = hp->h_addr_list; *ap; ap++) {
 121                 int i = (int)(sizeof(align) - ((size_t)*bpp % sizeof(align)));
 122
 123                 if (*lenp < (i + IN6ADDRSZ)) {
 124                         /* Out of memory.  Truncate address list here.  XXX */
 125                         *ap = NULL;
 126                         return;
 127                 }
 128                 *bpp += i;
 129                 *lenp -= i;
 130                 _map_v4v6_address(*ap, *bpp);
 131                 *ap = *bpp;
 132                 *bpp += IN6ADDRSZ;
 133                 *lenp -= IN6ADDRSZ;
 134         }
 135 }