Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.11
1.11 ! christos 1: /* $NetBSD: res_comp.c,v 1.10 2009/04/12 17:07:17 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
1.11 ! christos 78: __RCSID("$NetBSD: res_comp.c,v 1.10 2009/04/12 17:07:17 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>
89: #include <ctype.h>
90: #include <resolv.h>
91: #include <stdio.h>
92: #include <string.h>
93: #include <unistd.h>
94: #include "port_after.h"
95:
1.4 christos 96: #ifdef __weak_alias
97: __weak_alias(dn_expand,_dn_expand)
98: __weak_alias(dn_comp,__dn_comp)
1.6 christos 99: #if 0
1.4 christos 100: __weak_alias(dn_skipname,__dn_skipname)
101: __weak_alias(res_hnok,__res_hnok)
102: __weak_alias(res_ownok,__res_ownok)
103: __weak_alias(res_mailok,__res_mailok)
104: __weak_alias(res_dnok,__res_dnok)
105: #endif
1.5 christos 106: #endif
1.4 christos 107:
1.7 christos 108: /*%
1.1 christos 109: * Expand compressed domain name 'src' to full domain name.
1.7 christos 110: *
111: * \li 'msg' is a pointer to the begining of the message,
112: * \li 'eom' points to the first location after the message,
113: * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
114: * \li Return size of compressed name or -1 if there was an error.
1.1 christos 115: */
116: int
117: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
118: char *dst, int dstsiz)
119: {
120: int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
121:
122: if (n > 0 && dst[0] == '.')
123: dst[0] = '\0';
124: return (n);
125: }
126:
1.7 christos 127: /*%
1.1 christos 128: * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7 christos 129: *
130: * \li Return the size of the compressed name or -1.
131: * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1 christos 132: */
133: int
134: dn_comp(const char *src, u_char *dst, int dstsiz,
135: u_char **dnptrs, u_char **lastdnptr)
136: {
137: return (ns_name_compress(src, dst, (size_t)dstsiz,
1.11 ! christos 138: (void *)dnptrs,
! 139: (void *)lastdnptr));
1.1 christos 140: }
141:
1.7 christos 142: /*%
1.1 christos 143: * Skip over a compressed domain name. Return the size or -1.
144: */
145: int
146: dn_skipname(const u_char *ptr, const u_char *eom) {
147: const u_char *saveptr = ptr;
148:
149: if (ns_name_skip(&ptr, eom) == -1)
150: return (-1);
151: return (ptr - saveptr);
152: }
153:
1.7 christos 154: /*%
1.1 christos 155: * Verify that a domain name uses an acceptable character set.
1.7 christos 156: *
1.1 christos 157: * Note the conspicuous absence of ctype macros in these definitions. On
158: * non-ASCII hosts, we can't depend on string literals or ctype macros to
159: * tell us anything about network-format data. The rest of the BIND system
160: * is not careful about this, but for some reason, we're doing it right here.
161: */
162: #define PERIOD 0x2e
163: #define hyphenchar(c) ((c) == 0x2d)
164: #define bslashchar(c) ((c) == 0x5c)
165: #define periodchar(c) ((c) == PERIOD)
166: #define asterchar(c) ((c) == 0x2a)
167: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
168: || ((c) >= 0x61 && (c) <= 0x7a))
169: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
170:
171: #define borderchar(c) (alphachar(c) || digitchar(c))
172: #define middlechar(c) (borderchar(c) || hyphenchar(c))
173: #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
174:
175: int
176: res_hnok(const char *dn) {
177: int pch = PERIOD, ch = *dn++;
178:
179: while (ch != '\0') {
180: int nch = *dn++;
181:
182: if (periodchar(ch)) {
1.2 christos 183: ;
1.1 christos 184: } else if (periodchar(pch)) {
185: if (!borderchar(ch))
186: return (0);
187: } else if (periodchar(nch) || nch == '\0') {
188: if (!borderchar(ch))
189: return (0);
190: } else {
191: if (!middlechar(ch))
192: return (0);
193: }
194: pch = ch, ch = nch;
195: }
196: return (1);
197: }
198:
1.7 christos 199: /*%
1.1 christos 200: * hostname-like (A, MX, WKS) owners can have "*" as their first label
201: * but must otherwise be as a host name.
202: */
203: int
204: res_ownok(const char *dn) {
205: if (asterchar(dn[0])) {
206: if (periodchar(dn[1]))
207: return (res_hnok(dn+2));
208: if (dn[1] == '\0')
209: return (1);
210: }
211: return (res_hnok(dn));
212: }
213:
1.7 christos 214: /*%
1.1 christos 215: * SOA RNAMEs and RP RNAMEs can have any printable character in their first
216: * label, but the rest of the name has to look like a host name.
217: */
218: int
219: res_mailok(const char *dn) {
220: int ch, escaped = 0;
221:
222: /* "." is a valid missing representation */
223: if (*dn == '\0')
224: return (1);
225:
226: /* otherwise <label>.<hostname> */
227: while ((ch = *dn++) != '\0') {
228: if (!domainchar(ch))
229: return (0);
230: if (!escaped && periodchar(ch))
231: break;
232: if (escaped)
233: escaped = 0;
234: else if (bslashchar(ch))
235: escaped = 1;
236: }
237: if (periodchar(ch))
238: return (res_hnok(dn));
239: return (0);
240: }
241:
1.7 christos 242: /*%
243: * This function is quite liberal, since RFC1034's character sets are only
1.1 christos 244: * recommendations.
245: */
246: int
247: res_dnok(const char *dn) {
248: int ch;
249:
250: while ((ch = *dn++) != '\0')
251: if (!domainchar(ch))
252: return (0);
253: return (1);
254: }
255:
256: #ifdef BIND_4_COMPAT
1.7 christos 257: /*%
1.1 christos 258: * This module must export the following externally-visible symbols:
259: * ___putlong
260: * ___putshort
261: * __getlong
262: * __getshort
263: * Note that one _ comes from C and the others come from us.
264: */
1.7 christos 265:
266: #ifdef SOLARIS2
267: #ifdef __putlong
268: #undef __putlong
269: #endif
270: #ifdef __putshort
271: #undef __putshort
272: #endif
273: #pragma weak putlong = __putlong
274: #pragma weak putshort = __putshort
275: #endif /* SOLARIS2 */
276:
1.1 christos 277: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
278: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
279: #ifndef __ultrix__
280: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
281: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
282: #endif /*__ultrix__*/
283: #endif /*BIND_4_COMPAT*/
1.7 christos 284:
285: /*! \file */
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