1 /*
2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * Copyright (c) 1985, 1993
9 * The Regents of the University of California. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 /*
41 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
42 *
43 * Permission to use, copy, modify, and distribute this software for any
44 * purpose with or without fee is hereby granted, provided that the above
45 * copyright notice and this permission notice appear in all copies, and that
46 * the name of Digital Equipment Corporation not be used in advertising or
47 * publicity pertaining to distribution of the document or software without
48 * specific, written prior permission.
49 *
50 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
51 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
52 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
53 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
54 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
55 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
56 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
57 * SOFTWARE.
58 */
59
60 /*
61 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
62 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
63 *
64 * Permission to use, copy, modify, and distribute this software for any
65 * purpose with or without fee is hereby granted, provided that the above
66 * copyright notice and this permission notice appear in all copies.
67 *
68 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
69 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
70 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
71 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
72 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
73 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
74 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
75 */
76
77 #if defined(LIBC_SCCS) && !defined(lint)
78 static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
79 static const char rcsid[] = "$Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp $";
80 #endif /* LIBC_SCCS and not lint */
81
82 #include "port_before.h"
83 #include <sys/types.h>
84 #include <sys/param.h>
85 #include <netinet/in.h>
86 #include <arpa/nameser.h>
87 #include <ctype.h>
88 #include <resolv.h>
89 #include <stdio.h>
90 #include <string.h>
91 #include <unistd.h>
92 #include "port_after.h"
93
94 #ifndef ORIGINAL_ISC_CODE
95 #pragma weak __dn_skipname = dn_skipname
96 #pragma weak __res_dnok = res_dnok
97 #pragma weak __res_hnok = res_hnok
98 #pragma weak __res_mailok = res_mailok
99 #pragma weak __res_ownok = res_ownok
100 #endif /* ORIGINAL_ISC_CODE */
101
102 /*%
103 * Expand compressed domain name 'src' to full domain name.
104 *
105 * \li 'msg' is a pointer to the begining of the message,
106 * \li 'eom' points to the first location after the message,
107 * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
108 * \li Return size of compressed name or -1 if there was an error.
109 */
110 int
dn_expand(const u_char * msg,const u_char * eom,const u_char * src,char * dst,int dstsiz)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 *
124 * \li Return the size of the compressed name or -1.
125 * \li 'length' is the size of the array pointed to by 'comp_dn'.
126 */
127 int
dn_comp(const char * src,u_char * dst,int dstsiz,u_char ** dnptrs,u_char ** lastdnptr)128 dn_comp(const char *src, u_char *dst, int dstsiz,
129 u_char **dnptrs, u_char **lastdnptr)
130 {
131 return (ns_name_compress(src, dst, (size_t)dstsiz,
132 (const u_char **)dnptrs,
133 (const u_char **)lastdnptr));
134 }
135
136
137 /*%
138 * Skip over a compressed domain name. Return the size or -1.
139 */
140 int
dn_skipname(const u_char * ptr,const u_char * eom)141 dn_skipname(const u_char *ptr, const u_char *eom) {
142 const u_char *saveptr = ptr;
143
144 if (ns_name_skip(&ptr, eom) == -1)
145 return (-1);
146 return (ptr - saveptr);
147 }
148
149 /*%
150 * Verify that a domain name uses an acceptable character set.
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
res_hnok(const char * dn)178 res_hnok(const char *dn) {
179 int 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 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
res_ownok(const char * dn)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
res_mailok(const char * dn)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 RFC1034's character sets are only
246 * recommendations.
247 */
248 int
res_dnok(const char * dn)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
268 #ifdef SOLARIS2
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 /* SOLARIS2 */
278
__putlong(u_int32_t src,u_char * dst)279 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
__putshort(u_int16_t src,u_char * dst)280 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
281 #ifndef __ultrix__
_getlong(const u_char * src)282 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
_getshort(const u_char * src)283 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
284 #endif /*__ultrix__*/
285 #endif /*BIND_4_COMPAT*/
286
287 /*! \file */
288