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
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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
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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.
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
55 * Portions Copyright (c) 1996 by Internet Software Consortium.
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.
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
71 #if defined(LIBC_SCCS) && !defined(lint)
72 static char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
73 static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $";
74 #endif /* LIBC_SCCS and not lint */
75 #include <sys/cdefs.h>
76 __FBSDID("$FreeBSD$");
78 #include <sys/types.h>
79 #include <sys/param.h>
80 #include <netinet/in.h>
81 #include <arpa/nameser.h>
91 * Expand compressed domain name 'comp_dn' to full domain name.
92 * 'msg' is a pointer to the begining of the message,
93 * 'eomorig' points to the first location after the message,
94 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
95 * Return size of compressed name or -1 if there was an error.
98 dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
99 char *dst, int dstsiz)
101 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
103 if (n > 0 && dst[0] == '.')
109 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
110 * Return the size of the compressed name or -1.
111 * 'length' is the size of the array pointed to by 'comp_dn'.
114 dn_comp(const char *src, u_char *dst, int dstsiz,
115 u_char **dnptrs, u_char **lastdnptr)
117 return (ns_name_compress(src, dst, (size_t)dstsiz,
118 (const u_char **)dnptrs,
119 (const u_char **)lastdnptr));
123 * Skip over a compressed domain name. Return the size or -1.
126 dn_skipname(const u_char *ptr, const u_char *eom) {
127 const u_char *saveptr = ptr;
129 if (ns_name_skip(&ptr, eom) == -1)
131 return (ptr - saveptr);
135 * Verify that a domain name uses an acceptable character set.
139 * Note the conspicuous absence of ctype macros in these definitions. On
140 * non-ASCII hosts, we can't depend on string literals or ctype macros to
141 * tell us anything about network-format data. The rest of the BIND system
142 * is not careful about this, but for some reason, we're doing it right here.
145 #define hyphenchar(c) ((c) == 0x2d)
146 #define bslashchar(c) ((c) == 0x5c)
147 #define periodchar(c) ((c) == PERIOD)
148 #define asterchar(c) ((c) == 0x2a)
149 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
150 || ((c) >= 0x61 && (c) <= 0x7a))
151 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
153 #define borderchar(c) (alphachar(c) || digitchar(c))
154 #define middlechar(c) (borderchar(c) || hyphenchar(c))
155 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
161 int ppch = '\0', pch = PERIOD, ch = *dn++;
166 if (periodchar(ch)) {
168 } else if (periodchar(pch)) {
171 } else if (periodchar(nch) || nch == '\0') {
178 ppch = pch, pch = ch, ch = nch;
184 * hostname-like (A, MX, WKS) owners can have "*" as their first label
185 * but must otherwise be as a host name.
191 if (asterchar(dn[0])) {
192 if (periodchar(dn[1]))
193 return (res_hnok(dn+2));
197 return (res_hnok(dn));
201 * SOA RNAMEs and RP RNAMEs can have any printable character in their first
202 * label, but the rest of the name has to look like a host name.
210 /* "." is a valid missing representation */
214 /* otherwise <label>.<hostname> */
215 while ((ch = *dn++) != '\0') {
218 if (!escaped && periodchar(ch))
222 else if (bslashchar(ch))
226 return (res_hnok(dn));
231 * This function is quite liberal, since RFC 1034's character sets are only
240 while ((ch = *dn++) != '\0')
248 * This module must export the following externally-visible symbols:
253 * Note that one _ comes from C and the others come from us.
255 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
256 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
257 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
258 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
259 #endif /*BIND_4_COMPAT*/
262 * Weak aliases for applications that use certain private entry points,
263 * and fail to include <resolv.h>.
266 __weak_reference(__dn_comp, dn_comp);
268 __weak_reference(__dn_expand, dn_expand);