1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * ++Copyright++ 1985, 1988, 1993 5 * - 6 * Copyright (c) 1985, 1988, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * - 33 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 34 * 35 * Permission to use, copy, modify, and distribute this software for any 36 * purpose with or without fee is hereby granted, provided that the above 37 * copyright notice and this permission notice appear in all copies, and that 38 * the name of Digital Equipment Corporation not be used in advertising or 39 * publicity pertaining to distribution of the document or software without 40 * specific, written prior permission. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 49 * SOFTWARE. 50 * - 51 * --Copyright-- 52 */ 53 54 #include <sys/param.h> 55 #include <sys/socket.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 #include <arpa/nameser.h> 59 60 #include <stdio.h> 61 #include <string.h> 62 #include <netdb.h> 63 #include <resolv.h> 64 #include <ctype.h> 65 #include <syslog.h> 66 #include "netdb_private.h" 67 68 typedef union { 69 int32_t al; 70 char ac; 71 } align; 72 73 void 74 _map_v4v6_address(const char *src, char *dst) 75 { 76 /* Our caller may update in place. */ 77 memmove(&dst[12], src, NS_INADDRSZ); 78 /* Mark this ipv6 addr as a mapped ipv4. */ 79 memset(&dst[10], 0xff, 2); 80 memset(&dst[0], 0, 10); 81 } 82 83 void 84 _map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) { 85 char **ap; 86 87 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) 88 return; 89 hp->h_addrtype = AF_INET6; 90 hp->h_length = IN6ADDRSZ; 91 for (ap = hp->h_addr_list; *ap; ap++) { 92 int i = (u_long)*bpp % sizeof(align); 93 94 if (i != 0) 95 i = sizeof(align) - i; 96 97 if ((ep - *bpp) < (i + IN6ADDRSZ)) { 98 /* Out of memory. Truncate address list here. */ 99 *ap = NULL; 100 return; 101 } 102 *bpp += i; 103 _map_v4v6_address(*ap, *bpp); 104 *ap = *bpp; 105 *bpp += IN6ADDRSZ; 106 } 107 } 108