1 /* 2 * Copyright 2003 by Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * Copyright (c) 1985, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 /* 40 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 41 * 42 * Permission to use, copy, modify, and distribute this software for any 43 * purpose with or without fee is hereby granted, provided that the above 44 * copyright notice and this permission notice appear in all copies, and that 45 * the name of Digital Equipment Corporation not be used in advertising or 46 * publicity pertaining to distribution of the document or software without 47 * specific, written prior permission. 48 * 49 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 50 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 51 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 52 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 53 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 54 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 55 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 56 * SOFTWARE. 57 */ 58 59 /* 60 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 61 * 62 * Permission to use, copy, modify, and distribute this software for any 63 * purpose with or without fee is hereby granted, provided that the above 64 * copyright notice and this permission notice appear in all copies. 65 * 66 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 67 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 68 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 69 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 70 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 71 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 72 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 73 * SOFTWARE. 74 */ 75 76 #pragma ident "%Z%%M% %I% %E% SMI" 77 78 #if defined(LIBC_SCCS) && !defined(lint) 79 static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; 80 static const char rcsid[] = "$Id: res_comp.c,v 8.16 2002/08/07 03:47:34 marka Exp $"; 81 #endif /* LIBC_SCCS and not lint */ 82 83 #include "port_before.h" 84 #include <sys/types.h> 85 #include <sys/param.h> 86 #include <netinet/in.h> 87 #include <arpa/nameser.h> 88 #include <ctype.h> 89 #include <resolv.h> 90 #include <stdio.h> 91 #include <string.h> 92 #include <unistd.h> 93 #include "port_after.h" 94 95 #ifdef ORIGINAL_ISC_CODE 96 #else 97 #pragma weak __dn_skipname = dn_skipname 98 #pragma weak __res_dnok = res_dnok 99 #pragma weak __res_hnok = res_hnok 100 #pragma weak __res_mailok = res_mailok 101 #pragma weak __res_ownok = res_ownok 102 #endif /* ORIGINAL_ISC_CODE */ 103 /* 104 * Expand compressed domain name 'src' to full domain name. 105 * 'msg' is a pointer to the begining of the message, 106 * 'eom' points to the first location after the message, 107 * 'dst' is a pointer to a buffer of size 'dstsiz' for the result. 108 * Return size of compressed name or -1 if there was an error. 109 */ 110 int 111 dn_expand(const u_char *msg, const u_char *eom, const u_char *src, 112 char *dst, int dstsiz) 113 { 114 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); 115 116 if (n > 0 && dst[0] == '.') 117 dst[0] = '\0'; 118 return (n); 119 } 120 121 /* 122 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. 123 * Return the size of the compressed name or -1. 124 * 'length' is the size of the array pointed to by 'comp_dn'. 125 */ 126 int 127 dn_comp(const char *src, u_char *dst, int dstsiz, 128 u_char **dnptrs, u_char **lastdnptr) 129 { 130 return (ns_name_compress(src, dst, (size_t)dstsiz, 131 (const u_char **)dnptrs, 132 (const u_char **)lastdnptr)); 133 } 134 135 /* 136 * Skip over a compressed domain name. Return the size or -1. 137 */ 138 int 139 dn_skipname(const u_char *ptr, const u_char *eom) { 140 const u_char *saveptr = ptr; 141 142 if (ns_name_skip(&ptr, eom) == -1) 143 return (-1); 144 return (ptr - saveptr); 145 } 146 147 /* 148 * Verify that a domain name uses an acceptable character set. 149 */ 150 151 /* 152 * Note the conspicuous absence of ctype macros in these definitions. On 153 * non-ASCII hosts, we can't depend on string literals or ctype macros to 154 * tell us anything about network-format data. The rest of the BIND system 155 * is not careful about this, but for some reason, we're doing it right here. 156 */ 157 #define PERIOD 0x2e 158 #define hyphenchar(c) ((c) == 0x2d) 159 #define bslashchar(c) ((c) == 0x5c) 160 #ifdef SUNW_HNOK_UNDERSCORE 161 #define underscorechar(c) ((c) == 0x5f) 162 #endif /* SUNW_HNOK_UNDERSCORE */ 163 #define periodchar(c) ((c) == PERIOD) 164 #define asterchar(c) ((c) == 0x2a) 165 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ 166 || ((c) >= 0x61 && (c) <= 0x7a)) 167 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) 168 169 #define borderchar(c) (alphachar(c) || digitchar(c)) 170 #ifdef SUNW_HNOK_UNDERSCORE 171 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c)) 172 #else 173 #define middlechar(c) (borderchar(c) || hyphenchar(c)) 174 #endif /* SUNW_HNOK_UNDERSCORE */ 175 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f) 176 177 int 178 res_hnok(const char *dn) { 179 int ppch = '\0', pch = PERIOD, ch = *dn++; 180 181 while (ch != '\0') { 182 int nch = *dn++; 183 184 if (periodchar(ch)) { 185 (void)NULL; 186 } else if (periodchar(pch)) { 187 if (!borderchar(ch)) 188 return (0); 189 } else if (periodchar(nch) || nch == '\0') { 190 if (!borderchar(ch)) 191 return (0); 192 } else { 193 if (!middlechar(ch)) 194 return (0); 195 } 196 ppch = pch, pch = ch, ch = nch; 197 } 198 return (1); 199 } 200 201 /* 202 * hostname-like (A, MX, WKS) owners can have "*" as their first label 203 * but must otherwise be as a host name. 204 */ 205 int 206 res_ownok(const char *dn) { 207 if (asterchar(dn[0])) { 208 if (periodchar(dn[1])) 209 return (res_hnok(dn+2)); 210 if (dn[1] == '\0') 211 return (1); 212 } 213 return (res_hnok(dn)); 214 } 215 216 /* 217 * SOA RNAMEs and RP RNAMEs can have any printable character in their first 218 * label, but the rest of the name has to look like a host name. 219 */ 220 int 221 res_mailok(const char *dn) { 222 int ch, escaped = 0; 223 224 /* "." is a valid missing representation */ 225 if (*dn == '\0') 226 return (1); 227 228 /* otherwise <label>.<hostname> */ 229 while ((ch = *dn++) != '\0') { 230 if (!domainchar(ch)) 231 return (0); 232 if (!escaped && periodchar(ch)) 233 break; 234 if (escaped) 235 escaped = 0; 236 else if (bslashchar(ch)) 237 escaped = 1; 238 } 239 if (periodchar(ch)) 240 return (res_hnok(dn)); 241 return (0); 242 } 243 244 /* 245 * This function is quite liberal, since RFC 1034's character sets are only 246 * recommendations. 247 */ 248 int 249 res_dnok(const char *dn) { 250 int ch; 251 252 while ((ch = *dn++) != '\0') 253 if (!domainchar(ch)) 254 return (0); 255 return (1); 256 } 257 258 #ifdef BIND_4_COMPAT 259 /* 260 * This module must export the following externally-visible symbols: 261 * ___putlong 262 * ___putshort 263 * __getlong 264 * __getshort 265 * Note that one _ comes from C and the others come from us. 266 */ 267 #ifdef ORIGINAL_ISC_CODE 268 #else 269 #ifdef __putlong 270 #undef __putlong 271 #endif 272 #ifdef __putshort 273 #undef __putshort 274 #endif 275 #pragma weak putlong = __putlong 276 #pragma weak putshort = __putshort 277 #endif /* ORIGINAL_ISC_CODE */ 278 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } 279 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } 280 #ifndef __ultrix__ 281 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } 282 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } 283 #endif /*__ultrix__*/ 284 #endif /*BIND_4_COMPAT*/ 285