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) 57 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 58 static char rcsid[] = "$FreeBSD$"; 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 <string.h> 70 #include <netdb.h> 71 #include <resolv.h> 72 #include <ctype.h> 73 #include <syslog.h> 74 75 typedef union { 76 int32_t al; 77 char ac; 78 } align; 79 80 void 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 } 99 100 void 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