source: rtems/cpukit/libnetworking/libc/res_comp.c @ 09fdb5e8

4.104.114.84.95
Last change on this file since 09fdb5e8 was 09fdb5e8, checked in by Ralf Corsepius <ralf.corsepius@…>, on 03/30/07 at 05:15:58

Eliminate SCCS, LINT. Add HAVE_CONFIG_H.

  • Property mode set to 100644
File size: 7.9 KB
Line 
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 * Portions Copyright (c) 1996 by Internet Software Consortium.
56 *
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.
60 *
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
68 * SOFTWARE.
69 */
70
71#if HAVE_CONFIG_H
72#include "config.h"
73#endif
74
75#include <sys/types.h>
76#include <sys/param.h>
77#include <netinet/in.h>
78#include <arpa/nameser.h>
79#include <ctype.h>
80#include <resolv.h>
81#include <stdio.h>
82#include <string.h>
83#include <unistd.h>
84
85#define BIND_4_COMPAT
86
87/*
88 * Expand compressed domain name 'comp_dn' to full domain name.
89 * 'msg' is a pointer to the begining of the message,
90 * 'eomorig' points to the first location after the message,
91 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
92 * Return size of compressed name or -1 if there was an error.
93 */
94int
95dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
96          char *dst, int dstsiz)
97{
98        int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
99
100        if (n > 0 && dst[0] == '.')
101                dst[0] = '\0';
102        return (n);
103}
104
105/*
106 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
107 * Return the size of the compressed name or -1.
108 * 'length' is the size of the array pointed to by 'comp_dn'.
109 */
110int
111dn_comp(const char *src, u_char *dst, int dstsiz,
112        u_char **dnptrs, u_char **lastdnptr)
113{
114        return (ns_name_compress(src, dst, (size_t)dstsiz,
115                                 (const u_char **)dnptrs,
116                                 (const u_char **)lastdnptr));
117}
118
119/*
120 * Skip over a compressed domain name. Return the size or -1.
121 */
122int
123dn_skipname(const u_char *ptr, const u_char *eom) {
124        const u_char *saveptr = ptr;
125
126        if (ns_name_skip(&ptr, eom) == -1)
127                return (-1);
128        return (ptr - saveptr);
129}
130
131/*
132 * Verify that a domain name uses an acceptable character set.
133 */
134
135/*
136 * Note the conspicuous absence of ctype macros in these definitions.  On
137 * non-ASCII hosts, we can't depend on string literals or ctype macros to
138 * tell us anything about network-format data.  The rest of the BIND system
139 * is not careful about this, but for some reason, we're doing it right here.
140 */
141#define PERIOD 0x2e
142#define hyphenchar(c) ((c) == 0x2d)
143#define bslashchar(c) ((c) == 0x5c)
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)
149
150#define borderchar(c) (alphachar(c) || digitchar(c))
151#define middlechar(c) (borderchar(c) || hyphenchar(c))
152#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
153
154int
155res_hnok(dn)
156        const char *dn;
157{
158        int ppch = '\0', pch = PERIOD, ch = *dn++;
159
160        while (ch != '\0') {
161                int nch = *dn++;
162
163                if (periodchar(ch)) {
164                        (void)NULL;
165                } else if (periodchar(pch)) {
166                        if (!borderchar(ch))
167                                return (0);
168                } else if (periodchar(nch) || nch == '\0') {
169                        if (!borderchar(ch))
170                                return (0);
171                } else {
172                        if (!middlechar(ch))
173                                return (0);
174                }
175                ppch = pch, pch = ch, ch = nch;
176        }
177        return (1);
178}
179
180/*
181 * hostname-like (A, MX, WKS) owners can have "*" as their first label
182 * but must otherwise be as a host name.
183 */
184int
185res_ownok(dn)
186        const char *dn;
187{
188        if (asterchar(dn[0])) {
189                if (periodchar(dn[1]))
190                        return (res_hnok(dn+2));
191                if (dn[1] == '\0')
192                        return (1);
193        }
194        return (res_hnok(dn));
195}
196
197/*
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.
200 */
201int
202res_mailok(dn)
203        const char *dn;
204{
205        int ch, escaped = 0;
206
207        /* "." is a valid missing representation */
208        if (*dn == '\0')
209                return (1);
210
211        /* otherwise <label>.<hostname> */
212        while ((ch = *dn++) != '\0') {
213                if (!domainchar(ch))
214                        return (0);
215                if (!escaped && periodchar(ch))
216                        break;
217                if (escaped)
218                        escaped = 0;
219                else if (bslashchar(ch))
220                        escaped = 1;
221        }
222        if (periodchar(ch))
223                return (res_hnok(dn));
224        return (0);
225}
226
227/*
228 * This function is quite liberal, since RFC 1034's character sets are only
229 * recommendations.
230 */
231int
232res_dnok(dn)
233        const char *dn;
234{
235        int ch;
236
237        while ((ch = *dn++) != '\0')
238                if (!domainchar(ch))
239                        return (0);
240        return (1);
241}
242
243#ifdef BIND_4_COMPAT
244/*
245 * This module must export the following externally-visible symbols:
246 *    ___putlong
247 *    ___putshort
248 *    __getlong
249 *    __getshort
250 * Note that one _ comes from C and the others come from us.
251 */
252void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
253void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
254u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
255u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
256#endif /*BIND_4_COMPAT*/
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