xref: /freebsd/lib/libc/resolv/res_comp.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 /*
31  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
32  *
33  * Permission to use, copy, modify, and distribute this software for any
34  * purpose with or without fee is hereby granted, provided that the above
35  * copyright notice and this permission notice appear in all copies, and that
36  * the name of Digital Equipment Corporation not be used in advertising or
37  * publicity pertaining to distribution of the document or software without
38  * specific, written prior permission.
39  *
40  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
43  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47  * SOFTWARE.
48  */
49 
50 /*
51  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
52  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
53  *
54  * Permission to use, copy, modify, and distribute this software for any
55  * purpose with or without fee is hereby granted, provided that the above
56  * copyright notice and this permission notice appear in all copies.
57  *
58  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
59  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
60  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
61  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
63  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
64  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
65  */
66 
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)res_comp.c	8.1 (Berkeley) 6/4/93";
69 static const char rcsid[] = "$Id: res_comp.c,v 1.3.18.2 2005/07/28 07:38:11 marka Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
73 
74 #include "port_before.h"
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 #include "port_after.h"
85 
86 /*%
87  * Expand compressed domain name 'src' to full domain name.
88  *
89  * \li 'msg' is a pointer to the begining of the message,
90  * \li 'eom' points to the first location after the message,
91  * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
92  * \li Return size of compressed name or -1 if there was an error.
93  */
94 int
95 dn_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  *
108  * \li Return the size of the compressed name or -1.
109  * \li 'length' is the size of the array pointed to by 'comp_dn'.
110  */
111 int
112 dn_comp(const char *src, u_char *dst, int dstsiz,
113 	u_char **dnptrs, u_char **lastdnptr)
114 {
115 	return (ns_name_compress(src, dst, (size_t)dstsiz,
116 				 (const u_char **)dnptrs,
117 				 (const u_char **)lastdnptr));
118 }
119 
120 /*%
121  * Skip over a compressed domain name. Return the size or -1.
122  */
123 int
124 dn_skipname(const u_char *ptr, const u_char *eom) {
125 	const u_char *saveptr = ptr;
126 
127 	if (ns_name_skip(&ptr, eom) == -1)
128 		return (-1);
129 	return (ptr - saveptr);
130 }
131 
132 /*%
133  * Verify that a domain name uses an acceptable character set.
134  *
135  * Note the conspicuous absence of ctype macros in these definitions.  On
136  * non-ASCII hosts, we can't depend on string literals or ctype macros to
137  * tell us anything about network-format data.  The rest of the BIND system
138  * is not careful about this, but for some reason, we're doing it right here.
139  */
140 #define PERIOD 0x2e
141 #define	hyphenchar(c) ((c) == 0x2d)
142 #define bslashchar(c) ((c) == 0x5c)
143 #define periodchar(c) ((c) == PERIOD)
144 #define asterchar(c) ((c) == 0x2a)
145 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
146 		   || ((c) >= 0x61 && (c) <= 0x7a))
147 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
148 
149 #define borderchar(c) (alphachar(c) || digitchar(c))
150 #define middlechar(c) (borderchar(c) || hyphenchar(c))
151 #define	domainchar(c) ((c) > 0x20 && (c) < 0x7f)
152 
153 int
154 res_hnok(const char *dn) {
155 	int pch = PERIOD, ch = *dn++;
156 
157 	while (ch != '\0') {
158 		int nch = *dn++;
159 
160 		if (periodchar(ch)) {
161 			(void)NULL;
162 		} else if (periodchar(pch)) {
163 			if (!borderchar(ch))
164 				return (0);
165 		} else if (periodchar(nch) || nch == '\0') {
166 			if (!borderchar(ch))
167 				return (0);
168 		} else {
169 			if (!middlechar(ch))
170 				return (0);
171 		}
172 		pch = ch, ch = nch;
173 	}
174 	return (1);
175 }
176 
177 /*%
178  * hostname-like (A, MX, WKS) owners can have "*" as their first label
179  * but must otherwise be as a host name.
180  */
181 int
182 res_ownok(const char *dn) {
183 	if (asterchar(dn[0])) {
184 		if (periodchar(dn[1]))
185 			return (res_hnok(dn+2));
186 		if (dn[1] == '\0')
187 			return (1);
188 	}
189 	return (res_hnok(dn));
190 }
191 
192 /*%
193  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
194  * label, but the rest of the name has to look like a host name.
195  */
196 int
197 res_mailok(const char *dn) {
198 	int ch, escaped = 0;
199 
200 	/* "." is a valid missing representation */
201 	if (*dn == '\0')
202 		return (1);
203 
204 	/* otherwise <label>.<hostname> */
205 	while ((ch = *dn++) != '\0') {
206 		if (!domainchar(ch))
207 			return (0);
208 		if (!escaped && periodchar(ch))
209 			break;
210 		if (escaped)
211 			escaped = 0;
212 		else if (bslashchar(ch))
213 			escaped = 1;
214 	}
215 	if (periodchar(ch))
216 		return (res_hnok(dn));
217 	return (0);
218 }
219 
220 /*%
221  * This function is quite liberal, since RFC1034's character sets are only
222  * recommendations.
223  */
224 int
225 res_dnok(const char *dn) {
226 	int ch;
227 
228 	while ((ch = *dn++) != '\0')
229 		if (!domainchar(ch))
230 			return (0);
231 	return (1);
232 }
233 
234 #ifdef BIND_4_COMPAT
235 /*%
236  * This module must export the following externally-visible symbols:
237  *	___putlong
238  *	___putshort
239  *	__getlong
240  *	__getshort
241  * Note that one _ comes from C and the others come from us.
242  */
243 
244 #ifdef SOLARIS2
245 #ifdef  __putlong
246 #undef  __putlong
247 #endif
248 #ifdef  __putshort
249 #undef  __putshort
250 #endif
251 #pragma weak    putlong         =       __putlong
252 #pragma weak    putshort        =       __putshort
253 #endif /* SOLARIS2 */
254 
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 #ifndef __ultrix__
258 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
259 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
260 #endif /*__ultrix__*/
261 #endif /*BIND_4_COMPAT*/
262 
263 /*
264  * Weak aliases for applications that use certain private entry points,
265  * and fail to include <resolv.h>.
266  */
267 #undef dn_comp
268 __weak_reference(__dn_comp, dn_comp);
269 #undef dn_expand
270 __weak_reference(__dn_expand, dn_expand);
271 
272 /*! \file */
273