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 72 typedef union { 73 int32_t al; 74 char ac; 75 } align; 76 77 void 78 _map_v4v6_address(const char *src, char *dst) 79 { 80 u_char *p = (u_char *)dst; 81 char tmp[NS_INADDRSZ]; 82 int i; 83 84 /* Stash a temporary copy so our caller can update in place. */ 85 memcpy(tmp, src, NS_INADDRSZ); 86 /* Mark this ipv6 addr as a mapped ipv4. */ 87 for (i = 0; i < 10; i++) 88 *p++ = 0x00; 89 *p++ = 0xff; 90 *p++ = 0xff; 91 /* Retrieve the saved copy and we're done. */ 92 memcpy((void*)p, tmp, NS_INADDRSZ); 93 } 94 95 void 96 _map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) { 97 char **ap; 98 99 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) 100 return; 101 hp->h_addrtype = AF_INET6; 102 hp->h_length = IN6ADDRSZ; 103 for (ap = hp->h_addr_list; *ap; ap++) { 104 int i = (u_long)*bpp % sizeof(align); 105 106 if (i != 0) 107 i = sizeof(align) - i; 108 109 if ((ep - *bpp) < (i + IN6ADDRSZ)) { 110 /* Out of memory. Truncate address list here. */ 111 *ap = NULL; 112 return; 113 } 114 *bpp += i; 115 _map_v4v6_address(*ap, *bpp); 116 *ap = *bpp; 117 *bpp += IN6ADDRSZ; 118 } 119 } 120