map_v4v6.c revision 17903 
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";
58static char rcsid[] = "$Id: gethnamaddr.c,v 8.17 1996/08/05 08:31:35 vixie 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#include <arpa/nameser.h>
67
68#include <stdio.h>
69#include <netdb.h>
70#include <resolv.h>
71#include <ctype.h>
72#include <errno.h>
73#include <syslog.h>
74
75typedef union {
76	int32_t al;
77	char ac;
78} align;
79
80void
81_map_v4v6_address(src, dst)
82	const char *src;
83	char *dst;
84{
85	u_char *p = (u_char *)dst;
86	char tmp[INADDRSZ];
87	int i;
88
89	/* Stash a temporary copy so our caller can update in place. */
90	bcopy(src, tmp, INADDRSZ);
91	/* Mark this ipv6 addr as a mapped ipv4. */
92	for (i = 0; i < 10; i++)
93		*p++ = 0x00;
94	*p++ = 0xff;
95	*p++ = 0xff;
96	/* Retrieve the saved copy and we're done. */
97	bcopy(tmp, (void*)p, INADDRSZ);
98}
99
100void
101_map_v4v6_hostent(hp, bpp, lenp)
102	struct hostent *hp;
103	char **bpp;
104	int *lenp;
105{
106	char **ap;
107
108	if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
109		return;
110	hp->h_addrtype = AF_INET6;
111	hp->h_length = IN6ADDRSZ;
112	for (ap = hp->h_addr_list; *ap; ap++) {
113		int i = sizeof(align) - ((u_long)*bpp % sizeof(align));
114
115		if (*lenp < (i + IN6ADDRSZ)) {
116			/* Out of memory.  Truncate address list here.  XXX */
117			*ap = NULL;
118			return;
119		}
120		*bpp += i;
121		*lenp -= i;
122		_map_v4v6_address(*ap, *bpp);
123		*ap = *bpp;
124		*bpp += IN6ADDRSZ;
125		*lenp -= IN6ADDRSZ;
126	}
127}
128