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 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 57 * 58 * Permission to use, copy, modify, and distribute this software for any 59 * purpose with or without fee is hereby granted, provided that the above 60 * copyright notice and this permission notice appear in all copies. 61 * 62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71 #if defined(LIBC_SCCS) && !defined(lint) 72 static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; 73 static const char rcsid[] = "$Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp $"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include "port_before.h" 77 #include <sys/types.h> 78 #include <sys/param.h> 79 #include <netinet/in.h> 80 #include <arpa/nameser.h> 81 #include <ctype.h> 82 #include <resolv.h> 83 #include <stdio.h> 84 #include <string.h> 85 #include <unistd.h> 86 #include "port_after.h" 87 88 /*% 89 * Expand compressed domain name 'src' to full domain name. 90 * 91 * \li 'msg' is a pointer to the begining of the message, 92 * \li 'eom' points to the first location after the message, 93 * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result. 94 * \li Return size of compressed name or -1 if there was an error. 95 */ 96 int 97 dn_expand(const u_char *msg, const u_char *eom, const u_char *src, 98 char *dst, int dstsiz) 99 { 100 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); 101 102 if (n > 0 && dst[0] == '.') 103 dst[0] = '\0'; 104 return (n); 105 } 106 107 /*% 108 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. 109 * 110 * \li Return the size of the compressed name or -1. 111 * \li 'length' is the size of the array pointed to by 'comp_dn'. 112 */ 113 int 114 dn_comp(const char *src, u_char *dst, int dstsiz, 115 u_char **dnptrs, u_char **lastdnptr) 116 { 117 return (ns_name_compress(src, dst, (size_t)dstsiz, 118 (const u_char **)dnptrs, 119 (const u_char **)lastdnptr)); 120 } 121 122 /*% 123 * Skip over a compressed domain name. Return the size or -1. 124 */ 125 int 126 dn_skipname(const u_char *ptr, const u_char *eom) { 127 const u_char *saveptr = ptr; 128 129 if (ns_name_skip(&ptr, eom) == -1) 130 return (-1); 131 return (ptr - saveptr); 132 } 133 134 /*% 135 * Verify that a domain name uses an acceptable character set. 136 * 137 * Note the conspicuous absence of ctype macros in these definitions. On 138 * non-ASCII hosts, we can't depend on string literals or ctype macros to 139 * tell us anything about network-format data. The rest of the BIND system 140 * is not careful about this, but for some reason, we're doing it right here. 141 */ 142 #define PERIOD 0x2e 143 #define hyphenchar(c) ((c) == 0x2d) 144 #define bslashchar(c) ((c) == 0x5c) 145 #define periodchar(c) ((c) == PERIOD) 146 #define asterchar(c) ((c) == 0x2a) 147 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ 148 || ((c) >= 0x61 && (c) <= 0x7a)) 149 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) 150 151 #define borderchar(c) (alphachar(c) || digitchar(c)) 152 #define middlechar(c) (borderchar(c) || hyphenchar(c)) 153 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f) 154 155 int 156 res_hnok(const char *dn) { 157 int pch = PERIOD, ch = *dn++; 158 159 while (ch != '\0') { 160 int nch = *dn++; 161 162 if (periodchar(ch)) { 163 (void)NULL; 164 } else if (periodchar(pch)) { 165 if (!borderchar(ch)) 166 return (0); 167 } else if (periodchar(nch) || nch == '\0') { 168 if (!borderchar(ch)) 169 return (0); 170 } else { 171 if (!middlechar(ch)) 172 return (0); 173 } 174 pch = ch, ch = nch; 175 } 176 return (1); 177 } 178 179 /*% 180 * hostname-like (A, MX, WKS) owners can have "*" as their first label 181 * but must otherwise be as a host name. 182 */ 183 int 184 res_ownok(const char *dn) { 185 if (asterchar(dn[0])) { 186 if (periodchar(dn[1])) 187 return (res_hnok(dn+2)); 188 if (dn[1] == '\0') 189 return (1); 190 } 191 return (res_hnok(dn)); 192 } 193 194 /*% 195 * SOA RNAMEs and RP RNAMEs can have any printable character in their first 196 * label, but the rest of the name has to look like a host name. 197 */ 198 int 199 res_mailok(const char *dn) { 200 int ch, escaped = 0; 201 202 /* "." is a valid missing representation */ 203 if (*dn == '\0') 204 return (1); 205 206 /* otherwise <label>.<hostname> */ 207 while ((ch = *dn++) != '\0') { 208 if (!domainchar(ch)) 209 return (0); 210 if (!escaped && periodchar(ch)) 211 break; 212 if (escaped) 213 escaped = 0; 214 else if (bslashchar(ch)) 215 escaped = 1; 216 } 217 if (periodchar(ch)) 218 return (res_hnok(dn)); 219 return (0); 220 } 221 222 /*% 223 * This function is quite liberal, since RFC1034's character sets are only 224 * recommendations. 225 */ 226 int 227 res_dnok(const char *dn) { 228 int ch; 229 230 while ((ch = *dn++) != '\0') 231 if (!domainchar(ch)) 232 return (0); 233 return (1); 234 } 235 236 #ifdef BIND_4_COMPAT 237 /*% 238 * This module must export the following externally-visible symbols: 239 * ___putlong 240 * ___putshort 241 * __getlong 242 * __getshort 243 * Note that one _ comes from C and the others come from us. 244 */ 245 246 #ifdef SOLARIS2 247 #ifdef __putlong 248 #undef __putlong 249 #endif 250 #ifdef __putshort 251 #undef __putshort 252 #endif 253 #pragma weak putlong = __putlong 254 #pragma weak putshort = __putshort 255 #endif /* SOLARIS2 */ 256 257 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } 258 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } 259 #ifndef __ultrix__ 260 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } 261 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } 262 #endif /*__ultrix__*/ 263 #endif /*BIND_4_COMPAT*/ 264 265 #ifdef _LIBC 266 /* 267 * Weak aliases for applications that use certain private entry points, 268 * and fail to include <resolv.h>. 269 */ 270 #undef dn_comp 271 __weak_reference(__dn_comp, dn_comp); 272 #undef dn_expand 273 __weak_reference(__dn_expand, dn_expand); 274 #endif 275 /*! \file */ 276