1/* 2 * Copyright (c) 1985, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. 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 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 54/* 55 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 56 * 57 * Permission to use, copy, modify, and distribute this software for any 58 * purpose with or without fee is hereby granted, provided that the above 59 * copyright notice and this permission notice appear in all copies. 60 * 61 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 62 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 63 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 64 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 68 * SOFTWARE. 69 */ 70 71#if defined(LIBC_SCCS) && !defined(lint) 72static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; 73static const char rcsid[] = "$Id: res_comp.c,v 1.1 2006/03/01 19:01:37 majka Exp $"; 74#endif /* LIBC_SCCS and not lint */ 75 76#ifndef __APPLE__ 77#include "port_before.h" 78#endif 79#include <sys/types.h> 80#include <sys/param.h> 81#include <netinet/in.h> 82#include <arpa/nameser.h> 83#include <ctype.h> 84#include <resolv.h> 85#include <stdio.h> 86#include <string.h> 87#include <unistd.h> 88#ifndef __APPLE__ 89#include "port_after.h" 90#endif 91 92/* 93 * Expand compressed domain name 'comp_dn' to full domain name. 94 * 'msg' is a pointer to the begining of the message, 95 * 'eomorig' points to the first location after the message, 96 * 'exp_dn' is a pointer to a buffer of size 'length' for the result. 97 * Return size of compressed name or -1 if there was an error. 98 */ 99int 100dn_expand(const u_char *msg, const u_char *eom, const u_char *src, 101 char *dst, int dstsiz) 102{ 103 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); 104 105 if (n > 0 && dst[0] == '.') 106 dst[0] = '\0'; 107 return (n); 108} 109 110/* 111 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. 112 * Return the size of the compressed name or -1. 113 * 'length' is the size of the array pointed to by 'comp_dn'. 114 */ 115int 116dn_comp(const char *src, u_char *dst, int dstsiz, 117 u_char **dnptrs, u_char **lastdnptr) 118{ 119 return (ns_name_compress(src, dst, (size_t)dstsiz, 120 (const u_char **)dnptrs, 121 (const u_char **)lastdnptr)); 122} 123 124/* 125 * Skip over a compressed domain name. Return the size or -1. 126 */ 127int 128dn_skipname(const u_char *ptr, const u_char *eom) { 129 const u_char *saveptr = ptr; 130 131 if (ns_name_skip(&ptr, eom) == -1) 132 return (-1); 133 return (ptr - saveptr); 134} 135 136/* 137 * Verify that a domain name uses an acceptable character set. 138 */ 139 140/* 141 * Note the conspicuous absence of ctype macros in these definitions. On 142 * non-ASCII hosts, we can't depend on string literals or ctype macros to 143 * tell us anything about network-format data. The rest of the BIND system 144 * is not careful about this, but for some reason, we're doing it right here. 145 */ 146#define PERIOD 0x2e 147#define hyphenchar(c) ((c) == 0x2d) 148#define bslashchar(c) ((c) == 0x5c) 149#define periodchar(c) ((c) == PERIOD) 150#define asterchar(c) ((c) == 0x2a) 151#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ 152 || ((c) >= 0x61 && (c) <= 0x7a)) 153#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) 154 155#define borderchar(c) (alphachar(c) || digitchar(c)) 156#define middlechar(c) (borderchar(c) || hyphenchar(c)) 157#define domainchar(c) ((c) > 0x20 && (c) < 0x7f) 158 159int 160res_hnok(const char *dn) { 161 int ppch = '\0', pch = PERIOD, ch = *dn++; 162 163 while (ch != '\0') { 164 int nch = *dn++; 165 166 if (periodchar(ch)) { 167 (void)NULL; 168 } else if (periodchar(pch)) { 169 if (!borderchar(ch)) 170 return (0); 171 } else if (periodchar(nch) || nch == '\0') { 172 if (!borderchar(ch)) 173 return (0); 174 } else { 175 if (!middlechar(ch)) 176 return (0); 177 } 178 ppch = pch, pch = ch, ch = nch; 179 } 180 return (1); 181} 182 183/* 184 * hostname-like (A, MX, WKS) owners can have "*" as their first label 185 * but must otherwise be as a host name. 186 */ 187int 188res_ownok(const char *dn) { 189 if (asterchar(dn[0])) { 190 if (periodchar(dn[1])) 191 return (res_hnok(dn+2)); 192 if (dn[1] == '\0') 193 return (1); 194 } 195 return (res_hnok(dn)); 196} 197 198/* 199 * SOA RNAMEs and RP RNAMEs can have any printable character in their first 200 * label, but the rest of the name has to look like a host name. 201 */ 202int 203res_mailok(const char *dn) { 204 int ch, escaped = 0; 205 206 /* "." is a valid missing representation */ 207 if (*dn == '\0') 208 return (1); 209 210 /* otherwise <label>.<hostname> */ 211 while ((ch = *dn++) != '\0') { 212 if (!domainchar(ch)) 213 return (0); 214 if (!escaped && periodchar(ch)) 215 break; 216 if (escaped) 217 escaped = 0; 218 else if (bslashchar(ch)) 219 escaped = 1; 220 } 221 if (periodchar(ch)) 222 return (res_hnok(dn)); 223 return (0); 224} 225 226/* 227 * This function is quite liberal, since RFC 1034's character sets are only 228 * recommendations. 229 */ 230int 231res_dnok(const char *dn) { 232 int ch; 233 234 while ((ch = *dn++) != '\0') 235 if (!domainchar(ch)) 236 return (0); 237 return (1); 238} 239 240#ifdef __APPLE__ 241void putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } 242void putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } 243u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } 244u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } 245#else 246#ifdef BIND_4_COMPAT 247/* 248 * This module must export the following externally-visible symbols: 249 * ___putlong 250 * ___putshort 251 * __getlong 252 * __getshort 253 * Note that one _ comes from C and the others come from us. 254 */ 255void putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } 256void putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } 257#ifndef __ultrix__ 258u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } 259u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } 260#endif /*__ultrix__*/ 261#endif /*BIND_4_COMPAT*/ 262#endif /* __APPLE__ */ 263