2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.
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
51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
54 * Permission to use, copy, modify, and distribute this software for any
55 * purpose with or without fee is hereby granted, provided that the above
56 * copyright notice and this permission notice appear in all copies.
58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
69 static const char rcsid[] = "$Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
74 #include "port_before.h"
75 #include <sys/types.h>
76 #include <sys/param.h>
77 #include <netinet/in.h>
78 #include <arpa/nameser.h>
84 #include "port_after.h"
87 * Expand compressed domain name 'src' to full domain name.
89 * \li 'msg' is a pointer to the begining of the message,
90 * \li 'eom' points to the first location after the message,
91 * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
92 * \li Return size of compressed name or -1 if there was an error.
95 dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
96 char *dst, int dstsiz)
98 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
100 if (n > 0 && dst[0] == '.')
106 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
108 * \li Return the size of the compressed name or -1.
109 * \li 'length' is the size of the array pointed to by 'comp_dn'.
112 dn_comp(const char *src, u_char *dst, int dstsiz,
113 u_char **dnptrs, u_char **lastdnptr)
115 return (ns_name_compress(src, dst, (size_t)dstsiz,
116 (const u_char **)dnptrs,
117 (const u_char **)lastdnptr));
121 * Skip over a compressed domain name. Return the size or -1.
124 dn_skipname(const u_char *ptr, const u_char *eom) {
125 const u_char *saveptr = ptr;
127 if (ns_name_skip(&ptr, eom) == -1)
129 return (ptr - saveptr);
133 * Verify that a domain name uses an acceptable character set.
135 * Note the conspicuous absence of ctype macros in these definitions. On
136 * non-ASCII hosts, we can't depend on string literals or ctype macros to
137 * tell us anything about network-format data. The rest of the BIND system
138 * is not careful about this, but for some reason, we're doing it right here.
141 #define hyphenchar(c) ((c) == 0x2d)
142 #define bslashchar(c) ((c) == 0x5c)
143 #define underscorechar(c) ((c) == 0x5f)
144 #define periodchar(c) ((c) == PERIOD)
145 #define asterchar(c) ((c) == 0x2a)
146 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
147 || ((c) >= 0x61 && (c) <= 0x7a))
148 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
150 #define borderchar(c) (alphachar(c) || digitchar(c))
151 #ifdef RES_ENFORCE_RFC1034
152 #define middlechar(c) (borderchar(c) || hyphenchar(c))
154 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))
156 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
159 res_hnok(const char *dn) {
160 int pch = PERIOD, ch = *dn++;
165 if (periodchar(ch)) {
167 } else if (periodchar(pch)) {
170 } else if (periodchar(nch) || nch == '\0') {
183 * hostname-like (A, MX, WKS) owners can have "*" as their first label
184 * but must otherwise be as a host name.
187 res_ownok(const char *dn) {
188 if (asterchar(dn[0])) {
189 if (periodchar(dn[1]))
190 return (res_hnok(dn+2));
194 return (res_hnok(dn));
198 * SOA RNAMEs and RP RNAMEs can have any printable character in their first
199 * label, but the rest of the name has to look like a host name.
202 res_mailok(const char *dn) {
205 /* "." is a valid missing representation */
209 /* otherwise <label>.<hostname> */
210 while ((ch = *dn++) != '\0') {
213 if (!escaped && periodchar(ch))
217 else if (bslashchar(ch))
221 return (res_hnok(dn));
226 * This function is quite liberal, since RFC1034's character sets are only
230 res_dnok(const char *dn) {
233 while ((ch = *dn++) != '\0')
241 * This module must export the following externally-visible symbols:
246 * Note that one _ comes from C and the others come from us.
256 #pragma weak putlong = __putlong
257 #pragma weak putshort = __putshort
258 #endif /* SOLARIS2 */
260 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
261 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
263 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
264 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
265 #endif /*__ultrix__*/
266 #endif /*BIND_4_COMPAT*/
269 * Weak aliases for applications that use certain private entry points,
270 * and fail to include <resolv.h>.
273 __weak_reference(__dn_comp, dn_comp);
275 __weak_reference(__dn_expand, dn_expand);