map_v4v6.c revision 98865 
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)
57static char sccsid[] = "@(#)gethostnamadr.c	8.1 (Berkeley) 6/4/93";
58#endif /* LIBC_SCCS and not lint */
59#include <sys/cdefs.h>
60__FBSDID("$FreeBSD: head/lib/libc/net/map_v4v6.c 98865 2002-06-26 08:18:05Z imp $");
61
62#include <sys/types.h>
63#include <sys/param.h>
64#include <sys/socket.h>
65#include <netinet/in.h>
66#include <arpa/inet.h>
67#include <arpa/nameser.h>
68
69#include <stdio.h>
70#include <string.h>
71#include <netdb.h>
72#include <resolv.h>
73#include <ctype.h>
74#include <syslog.h>
75
76typedef union {
77	int32_t al;
78	char ac;
79} align;
80
81void
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
101void
102_map_v4v6_hostent(hp, bpp, epp)
103	struct hostent *hp;
104	char **bpp;
105	char **epp;
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 (*epp - *bpp < (i + IN6ADDRSZ)) {
117			/* Out of memory.  Truncate address list here.  XXX */
118			*ap = NULL;
119			return;
120		}
121		*bpp += i;
122		_map_v4v6_address(*ap, *bpp);
123		*ap = *bpp;
124		*bpp += IN6ADDRSZ;
125	}
126}
127