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 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93 56 * $FreeBSD: src/lib/libc/net/map_v4v6.c,v 1.5.2.1 2001/03/05 10:47:08 obrien Exp $ 57 * $DragonFly: src/lib/libc/net/map_v4v6.c,v 1.2 2003/06/17 04:26:44 dillon Exp $ 58 */ 59 60 #include <sys/types.h> 61 #include <sys/param.h> 62 #include <sys/socket.h> 63 #include <netinet/in.h> 64 #include <arpa/inet.h> 65 #include <arpa/nameser.h> 66 67 #include <stdio.h> 68 #include <string.h> 69 #include <netdb.h> 70 #include <resolv.h> 71 #include <ctype.h> 72 #include <syslog.h> 73 74 typedef union { 75 int32_t al; 76 char ac; 77 } align; 78 79 void 80 _map_v4v6_address(src, dst) 81 const char *src; 82 char *dst; 83 { 84 u_char *p = (u_char *)dst; 85 char tmp[INADDRSZ]; 86 int i; 87 88 /* Stash a temporary copy so our caller can update in place. */ 89 bcopy(src, tmp, INADDRSZ); 90 /* Mark this ipv6 addr as a mapped ipv4. */ 91 for (i = 0; i < 10; i++) 92 *p++ = 0x00; 93 *p++ = 0xff; 94 *p++ = 0xff; 95 /* Retrieve the saved copy and we're done. */ 96 bcopy(tmp, (void*)p, INADDRSZ); 97 } 98 99 void 100 _map_v4v6_hostent(hp, bpp, lenp) 101 struct hostent *hp; 102 char **bpp; 103 int *lenp; 104 { 105 char **ap; 106 107 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) 108 return; 109 hp->h_addrtype = AF_INET6; 110 hp->h_length = IN6ADDRSZ; 111 for (ap = hp->h_addr_list; *ap; ap++) { 112 int i = sizeof(align) - ((u_long)*bpp % sizeof(align)); 113 114 if (*lenp < (i + IN6ADDRSZ)) { 115 /* Out of memory. Truncate address list here. XXX */ 116 *ap = NULL; 117 return; 118 } 119 *bpp += i; 120 *lenp -= i; 121 _map_v4v6_address(*ap, *bpp); 122 *ap = *bpp; 123 *bpp += IN6ADDRSZ; 124 *lenp -= IN6ADDRSZ; 125 } 126 } 127