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) 2004,2009
56: * by Internet Systems Consortium, Inc. ("ISC")
57: * Portions Copyright (c) 1996-2003 by Internet Software Consortium
58: *
59: * Permission to use, copy, modify, and distribute this software for any
60: * purpose with or without fee is hereby granted, provided that the above
61: * copyright notice and this permission notice appear in all copies.
62: *
63: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
64: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
65: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
66: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
67: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
68: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
69: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
70: *
71: * Internet Systems Consortium, Inc.
72: * 950 Charter Street
73: * Redwood City, CA 94063
74: * <info@isc.org>
75: * https://www.isc.org/
76: */
77:
78: #if defined(LIBC_SCCS) && !defined(lint)
79: static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
80: static const char rcsid[] = "$Id: res_comp.c,v 1.1.1.1 2012/10/09 09:06:54 misho Exp $";
81: #endif /* LIBC_SCCS and not lint */
82:
83: #include <sys/types.h>
84: #include <sys/param.h>
85: #include <netinet/in.h>
86: #include <ctype.h>
87: #include <stdio.h>
88: #include <string.h>
89: #include <unistd.h>
90: #include <sys/socket.h>
91:
92: #include "minires/minires.h"
93: #include "arpa/nameser.h"
94:
95: /*
96: * Expand compressed domain name 'comp_dn' to full domain name.
97: * 'msg' is a pointer to the begining of the message,
98: * 'eomorig' points to the first location after the message,
99: * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
100: * Return size of compressed name or -1 if there was an error.
101: */
102: int
103: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
104: char *dst, unsigned dstsiz)
105: {
106: int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
107:
108: if (n > 0 && dst[0] == '.')
109: dst[0] = '\0';
110: return (n);
111: }
112:
113: /*
114: * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
115: * Return the size of the compressed name or -1.
116: * 'length' is the size of the array pointed to by 'comp_dn'.
117: */
118: int
119: dn_comp(const char *src, u_char *dst, unsigned dstsiz,
120: u_char **dnptrs, u_char **lastdnptr)
121: {
122: return (ns_name_compress(src, dst, (size_t)dstsiz,
123: (const u_char **)dnptrs,
124: (const u_char **)lastdnptr));
125: }
126:
127: /*
128: * Skip over a compressed domain name. Return the size or -1.
129: */
130: int
131: dn_skipname(const u_char *ptr, const u_char *eom) {
132: const u_char *saveptr = ptr;
133:
134: if (ns_name_skip(&ptr, eom) == -1)
135: return (-1);
136: return (ptr - saveptr);
137: }
138:
139: /*
140: * Verify that a domain name uses an acceptable character set.
141: */
142:
143: #if 0
144: /*
145: * Note the conspicuous absence of ctype macros in these definitions. On
146: * non-ASCII hosts, we can't depend on string literals or ctype macros to
147: * tell us anything about network-format data. The rest of the BIND system
148: * is not careful about this, but for some reason, we're doing it right here.
149: */
150: #define PERIOD 0x2e
151: #define hyphenchar(c) ((c) == 0x2d)
152: #define bslashchar(c) ((c) == 0x5c)
153: #define periodchar(c) ((c) == PERIOD)
154: #define asterchar(c) ((c) == 0x2a)
155: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
156: || ((c) >= 0x61 && (c) <= 0x7a))
157: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
158:
159: #define borderchar(c) (alphachar(c) || digitchar(c))
160: #define middlechar(c) (borderchar(c) || hyphenchar(c))
161: #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
162:
163: int
164: res_hnok(const char *dn) {
165: int ppch = '\0', pch = PERIOD, ch = *dn++;
166:
167: while (ch != '\0') {
168: int nch = *dn++;
169:
170: if (periodchar(ch)) {
171: (void)NULL;
172: } else if (periodchar(pch)) {
173: if (!borderchar(ch))
174: return (0);
175: } else if (periodchar(nch) || nch == '\0') {
176: if (!borderchar(ch))
177: return (0);
178: } else {
179: if (!middlechar(ch))
180: return (0);
181: }
182: ppch = pch, pch = ch, ch = nch;
183: }
184: return (1);
185: }
186:
187: /*
188: * hostname-like (A, MX, WKS) owners can have "*" as their first label
189: * but must otherwise be as a host name.
190: */
191: int
192: res_ownok(const char *dn) {
193: if (asterchar(dn[0])) {
194: if (periodchar(dn[1]))
195: return (res_hnok(dn+2));
196: if (dn[1] == '\0')
197: return (1);
198: }
199: return (res_hnok(dn));
200: }
201:
202: /*
203: * SOA RNAMEs and RP RNAMEs can have any printable character in their first
204: * label, but the rest of the name has to look like a host name.
205: */
206: int
207: res_mailok(const char *dn) {
208: int ch, escaped = 0;
209:
210: /* "." is a valid missing representation */
211: if (*dn == '\0')
212: return (1);
213:
214: /* otherwise <label>.<hostname> */
215: while ((ch = *dn++) != '\0') {
216: if (!domainchar(ch))
217: return (0);
218: if (!escaped && periodchar(ch))
219: break;
220: if (escaped)
221: escaped = 0;
222: else if (bslashchar(ch))
223: escaped = 1;
224: }
225: if (periodchar(ch))
226: return (res_hnok(dn));
227: return (0);
228: }
229:
230: /*
231: * This function is quite liberal, since RFC 1034's character sets are only
232: * recommendations.
233: */
234: int
235: res_dnok(const char *dn) {
236: int ch;
237:
238: while ((ch = *dn++) != '\0')
239: if (!domainchar(ch))
240: return (0);
241: return (1);
242: }
243: #endif
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