Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.12
1.12 ! christos 1: /* $NetBSD: res_comp.c,v 1.11 2011/08/17 09:53:53 christos Exp $ */
1.1 christos 2:
3: /*
4: * Copyright (c) 1985, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: /*
37: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38: *
39: * Permission to use, copy, modify, and distribute this software for any
40: * purpose with or without fee is hereby granted, provided that the above
41: * copyright notice and this permission notice appear in all copies, and that
42: * the name of Digital Equipment Corporation not be used in advertising or
43: * publicity pertaining to distribution of the document or software without
44: * specific, written prior permission.
45: *
46: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53: * SOFTWARE.
54: */
55:
56: /*
57: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
58: * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59: *
60: * Permission to use, copy, modify, and distribute this software for any
61: * purpose with or without fee is hereby granted, provided that the above
62: * copyright notice and this permission notice appear in all copies.
63: *
64: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
65: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
66: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
67: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
68: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
69: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
70: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71: */
1.3 christos 72: #include <sys/cdefs.h>
1.1 christos 73: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 74: #ifdef notdef
1.1 christos 75: static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
1.9 christos 76: static const char rcsid[] = "Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp";
1.3 christos 77: #else
1.12 ! christos 78: __RCSID("$NetBSD: res_comp.c,v 1.11 2011/08/17 09:53:53 christos Exp $");
1.3 christos 79: #endif
1.1 christos 80: #endif /* LIBC_SCCS and not lint */
81:
82: #include "port_before.h"
1.4 christos 83:
84: #include "namespace.h"
1.1 christos 85: #include <sys/types.h>
86: #include <sys/param.h>
87: #include <netinet/in.h>
88: #include <arpa/nameser.h>
1.12 ! christos 89: #include <assert.h>
1.1 christos 90: #include <ctype.h>
91: #include <resolv.h>
92: #include <stdio.h>
93: #include <string.h>
94: #include <unistd.h>
95: #include "port_after.h"
96:
1.4 christos 97: #ifdef __weak_alias
98: __weak_alias(dn_expand,_dn_expand)
99: __weak_alias(dn_comp,__dn_comp)
1.6 christos 100: #if 0
1.4 christos 101: __weak_alias(dn_skipname,__dn_skipname)
102: __weak_alias(res_hnok,__res_hnok)
103: __weak_alias(res_ownok,__res_ownok)
104: __weak_alias(res_mailok,__res_mailok)
105: __weak_alias(res_dnok,__res_dnok)
106: #endif
1.5 christos 107: #endif
1.4 christos 108:
1.7 christos 109: /*%
1.1 christos 110: * Expand compressed domain name 'src' to full domain name.
1.7 christos 111: *
112: * \li 'msg' is a pointer to the begining of the message,
113: * \li 'eom' points to the first location after the message,
114: * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
115: * \li Return size of compressed name or -1 if there was an error.
1.1 christos 116: */
117: int
118: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
119: char *dst, int dstsiz)
120: {
121: int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
122:
123: if (n > 0 && dst[0] == '.')
124: dst[0] = '\0';
125: return (n);
126: }
127:
1.7 christos 128: /*%
1.1 christos 129: * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7 christos 130: *
131: * \li Return the size of the compressed name or -1.
132: * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1 christos 133: */
134: int
135: dn_comp(const char *src, u_char *dst, int dstsiz,
136: u_char **dnptrs, u_char **lastdnptr)
137: {
138: return (ns_name_compress(src, dst, (size_t)dstsiz,
1.11 christos 139: (void *)dnptrs,
140: (void *)lastdnptr));
1.1 christos 141: }
142:
1.7 christos 143: /*%
1.1 christos 144: * Skip over a compressed domain name. Return the size or -1.
145: */
146: int
147: dn_skipname(const u_char *ptr, const u_char *eom) {
148: const u_char *saveptr = ptr;
149:
150: if (ns_name_skip(&ptr, eom) == -1)
151: return (-1);
1.12 ! christos 152: _DIAGASSERT(__type_fit(int, ptr - saveptr));
! 153: return (int)(ptr - saveptr);
1.1 christos 154: }
155:
1.7 christos 156: /*%
1.1 christos 157: * Verify that a domain name uses an acceptable character set.
1.7 christos 158: *
1.1 christos 159: * Note the conspicuous absence of ctype macros in these definitions. On
160: * non-ASCII hosts, we can't depend on string literals or ctype macros to
161: * tell us anything about network-format data. The rest of the BIND system
162: * is not careful about this, but for some reason, we're doing it right here.
163: */
164: #define PERIOD 0x2e
165: #define hyphenchar(c) ((c) == 0x2d)
166: #define bslashchar(c) ((c) == 0x5c)
167: #define periodchar(c) ((c) == PERIOD)
168: #define asterchar(c) ((c) == 0x2a)
169: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
170: || ((c) >= 0x61 && (c) <= 0x7a))
171: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
172:
173: #define borderchar(c) (alphachar(c) || digitchar(c))
174: #define middlechar(c) (borderchar(c) || hyphenchar(c))
175: #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
176:
177: int
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)) {
1.2 christos 185: ;
1.1 christos 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:
1.7 christos 201: /*%
1.1 christos 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
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:
1.7 christos 216: /*%
1.1 christos 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
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:
1.7 christos 244: /*%
245: * This function is quite liberal, since RFC1034's character sets are only
1.1 christos 246: * recommendations.
247: */
248: int
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
1.7 christos 259: /*%
1.1 christos 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: */
1.7 christos 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:
1.1 christos 279: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
280: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
281: #ifndef __ultrix__
282: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
283: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
284: #endif /*__ultrix__*/
285: #endif /*BIND_4_COMPAT*/
1.7 christos 286:
287: /*! \file */
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