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 #include "port_before.h"
78 #include <sys/types.h>
79 #include <sys/param.h>
80 #include <netinet/in.h>
81 #include <arpa/nameser.h>
82 #include <ctype.h>
83 #include <resolv.h>
84 #include <stdio.h>
85 #include <string.h>
86 #include <unistd.h>
87 #include "port_after.h"
88
89 #ifndef ORIGINAL_ISC_CODE
90 #pragma weak __dn_skipname = dn_skipname
91 #pragma weak __res_dnok = res_dnok
92 #pragma weak __res_hnok = res_hnok
93 #pragma weak __res_mailok = res_mailok
94 #pragma weak __res_ownok = res_ownok
95 #endif /* ORIGINAL_ISC_CODE */
96
97 /*%
98 * Expand compressed domain name 'src' to full domain name.
99 *
100 * \li 'msg' is a pointer to the begining of the message,
101 * \li 'eom' points to the first location after the message,
102 * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
103 * \li Return size of compressed name or -1 if there was an error.
104 */
105 int
dn_expand(const u_char * msg,const u_char * eom,const u_char * src,char * dst,int dstsiz)106 dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
107 char *dst, int dstsiz)
108 {
109 int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
110
111 if (n > 0 && dst[0] == '.')
112 dst[0] = '\0';
113 return (n);
114 }
115
116 /*%
117 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
118 *
119 * \li Return the size of the compressed name or -1.
120 * \li 'length' is the size of the array pointed to by 'comp_dn'.
121 */
122 int
dn_comp(const char * src,u_char * dst,int dstsiz,u_char ** dnptrs,u_char ** lastdnptr)123 dn_comp(const char *src, u_char *dst, int dstsiz,
124 u_char **dnptrs, u_char **lastdnptr)
125 {
126 return (ns_name_compress(src, dst, (size_t)dstsiz,
127 (const u_char **)dnptrs,
128 (const u_char **)lastdnptr));
129 }
130
131
132 /*%
133 * Skip over a compressed domain name. Return the size or -1.
134 */
135 int
dn_skipname(const u_char * ptr,const u_char * eom)136 dn_skipname(const u_char *ptr, const u_char *eom) {
137 const u_char *saveptr = ptr;
138
139 if (ns_name_skip(&ptr, eom) == -1)
140 return (-1);
141 return (ptr - saveptr);
142 }
143
144 /*%
145 * Verify that a domain name uses an acceptable character set.
146 *
147 * Note the conspicuous absence of ctype macros in these definitions. On
148 * non-ASCII hosts, we can't depend on string literals or ctype macros to
149 * tell us anything about network-format data. The rest of the BIND system
150 * is not careful about this, but for some reason, we're doing it right here.
151 */
152 #define PERIOD 0x2e
153 #define hyphenchar(c) ((c) == 0x2d)
154 #define bslashchar(c) ((c) == 0x5c)
155 #ifdef SUNW_HNOK_UNDERSCORE
156 #define underscorechar(c) ((c) == 0x5f)
157 #endif /* SUNW_HNOK_UNDERSCORE */
158 #define periodchar(c) ((c) == PERIOD)
159 #define asterchar(c) ((c) == 0x2a)
160 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
161 || ((c) >= 0x61 && (c) <= 0x7a))
162 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
163
164 #define borderchar(c) (alphachar(c) || digitchar(c))
165 #ifdef SUNW_HNOK_UNDERSCORE
166 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))
167 #else
168 #define middlechar(c) (borderchar(c) || hyphenchar(c))
169 #endif /* SUNW_HNOK_UNDERSCORE */
170 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
171
172 int
res_hnok(const char * dn)173 res_hnok(const char *dn) {
174 int pch = PERIOD, ch = *dn++;
175
176 while (ch != '\0') {
177 int nch = *dn++;
178
179 if (periodchar(ch)) {
180 (void)NULL;
181 } else if (periodchar(pch)) {
182 if (!borderchar(ch))
183 return (0);
184 } else if (periodchar(nch) || nch == '\0') {
185 if (!borderchar(ch))
186 return (0);
187 } else {
188 if (!middlechar(ch))
189 return (0);
190 }
191 pch = ch, ch = nch;
192 }
193 return (1);
194 }
195
196 /*%
197 * hostname-like (A, MX, WKS) owners can have "*" as their first label
198 * but must otherwise be as a host name.
199 */
200 int
res_ownok(const char * dn)201 res_ownok(const char *dn) {
202 if (asterchar(dn[0])) {
203 if (periodchar(dn[1]))
204 return (res_hnok(dn+2));
205 if (dn[1] == '\0')
206 return (1);
207 }
208 return (res_hnok(dn));
209 }
210
211 /*%
212 * SOA RNAMEs and RP RNAMEs can have any printable character in their first
213 * label, but the rest of the name has to look like a host name.
214 */
215 int
res_mailok(const char * dn)216 res_mailok(const char *dn) {
217 int ch, escaped = 0;
218
219 /* "." is a valid missing representation */
220 if (*dn == '\0')
221 return (1);
222
223 /* otherwise <label>.<hostname> */
224 while ((ch = *dn++) != '\0') {
225 if (!domainchar(ch))
226 return (0);
227 if (!escaped && periodchar(ch))
228 break;
229 if (escaped)
230 escaped = 0;
231 else if (bslashchar(ch))
232 escaped = 1;
233 }
234 if (periodchar(ch))
235 return (res_hnok(dn));
236 return (0);
237 }
238
239 /*%
240 * This function is quite liberal, since RFC1034's character sets are only
241 * recommendations.
242 */
243 int
res_dnok(const char * dn)244 res_dnok(const char *dn) {
245 int ch;
246
247 while ((ch = *dn++) != '\0')
248 if (!domainchar(ch))
249 return (0);
250 return (1);
251 }
252
253 #ifdef BIND_4_COMPAT
254 /*%
255 * This module must export the following externally-visible symbols:
256 * ___putlong
257 * ___putshort
258 * __getlong
259 * __getshort
260 * Note that one _ comes from C and the others come from us.
261 */
262
263 #ifdef SOLARIS2
264 #ifdef __putlong
265 #undef __putlong
266 #endif
267 #ifdef __putshort
268 #undef __putshort
269 #endif
270 #pragma weak putlong = __putlong
271 #pragma weak putshort = __putshort
272 #endif /* SOLARIS2 */
273
__putlong(u_int32_t src,u_char * dst)274 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
__putshort(u_int16_t src,u_char * dst)275 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
276 #ifndef __ultrix__
_getlong(const u_char * src)277 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
_getshort(const u_char * src)278 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
279 #endif /*__ultrix__*/
280 #endif /*BIND_4_COMPAT*/
281
282 /*! \file */
283