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 * 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.
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
33 * @(#)res_comp.c 8.1 (Berkeley) 6/4/93
34 * $From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $
35 * $FreeBSD: src/lib/libc/net/res_comp.c,v 1.16 1999/08/28 00:00:16 peter Exp $
36 * $DragonFly: src/lib/libc/net/res_comp.c,v 1.2 2003/06/17 04:26:44 dillon Exp $
40 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.
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
60 * Portions Copyright (c) 1996 by Internet Software Consortium.
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.
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
76 #include <sys/types.h>
77 #include <sys/param.h>
78 #include <netinet/in.h>
79 #include <arpa/nameser.h>
89 * Expand compressed domain name 'comp_dn' to full domain name.
90 * 'msg' is a pointer to the begining of the message,
91 * 'eomorig' points to the first location after the message,
92 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
93 * Return size of compressed name or -1 if there was an error.
96 dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
97 char *dst, int dstsiz)
99 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
101 if (n > 0 && dst[0] == '.')
107 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
108 * Return the size of the compressed name or -1.
109 * '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.
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.
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)
151 #define borderchar(c) (alphachar(c) || digitchar(c))
152 #define middlechar(c) (borderchar(c) || hyphenchar(c))
153 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
159 int ppch = '\0', pch = PERIOD, ch = *dn++;
164 if (periodchar(ch)) {
166 } else if (periodchar(pch)) {
169 } else if (periodchar(nch) || nch == '\0') {
176 ppch = pch, pch = ch, ch = nch;
182 * hostname-like (A, MX, WKS) owners can have "*" as their first label
183 * but must otherwise be as a host name.
189 if (asterchar(dn[0])) {
190 if (periodchar(dn[1]))
191 return (res_hnok(dn+2));
195 return (res_hnok(dn));
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.
208 /* "." is a valid missing representation */
212 /* otherwise <label>.<hostname> */
213 while ((ch = *dn++) != '\0') {
216 if (!escaped && periodchar(ch))
220 else if (bslashchar(ch))
224 return (res_hnok(dn));
229 * This function is quite liberal, since RFC 1034's character sets are only
238 while ((ch = *dn++) != '\0')
246 * This module must export the following externally-visible symbols:
251 * Note that one _ comes from C and the others come from us.
253 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
254 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
255 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
256 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
257 #endif /*BIND_4_COMPAT*/
260 * Weak aliases for applications that use certain private entry points,
261 * and fail to include <resolv.h>.
264 __weak_reference(__dn_comp, dn_comp);
266 __weak_reference(__dn_expand, dn_expand);