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 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 * -
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47 * SOFTWARE.
48 * -
49 * --Copyright--
50 */
51
52 #if defined(LIBC_SCCS) && !defined(lint)
53 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
54 #endif /* LIBC_SCCS and not lint */
55 #include <sys/cdefs.h>
56 __FBSDID("$FreeBSD$");
57
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <sys/socket.h>
61 #include <netinet/in.h>
62 #include <arpa/inet.h>
63 #include <arpa/nameser.h>
64
65 #include <stdio.h>
66 #include <string.h>
67 #include <netdb.h>
68 #include <resolv.h>
69 #include <ctype.h>
70 #include <syslog.h>
71 #include "netdb_private.h"
72
73 typedef union {
74 int32_t al;
75 char ac;
76 } align;
77
78 void
_map_v4v6_address(const char * src,char * dst)79 _map_v4v6_address(const char *src, char *dst)
80 {
81 /* Our caller may update in place. */
82 memmove(&dst[12], src, NS_INADDRSZ);
83 /* Mark this ipv6 addr as a mapped ipv4. */
84 memset(&dst[10], 0xff, 2);
85 memset(&dst[0], 0, 10);
86 }
87
88 void
_map_v4v6_hostent(struct hostent * hp,char ** bpp,char * ep)89 _map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) {
90 char **ap;
91
92 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
93 return;
94 hp->h_addrtype = AF_INET6;
95 hp->h_length = IN6ADDRSZ;
96 for (ap = hp->h_addr_list; *ap; ap++) {
97 int i = (u_long)*bpp % sizeof(align);
98
99 if (i != 0)
100 i = sizeof(align) - i;
101
102 if ((ep - *bpp) < (i + IN6ADDRSZ)) {
103 /* Out of memory. Truncate address list here. */
104 *ap = NULL;
105 return;
106 }
107 *bpp += i;
108 _map_v4v6_address(*ap, *bpp);
109 *ap = *bpp;
110 *bpp += IN6ADDRSZ;
111 }
112 }
113