Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.13
1.13 ! christos 1: /* $NetBSD: res_comp.c,v 1.12 2012/03/13 21:13:43 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.
1.13 ! christos 15: * 3. Neither the name of the University nor the names of its contributors
1.1 christos 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: /*
33: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34: *
35: * Permission to use, copy, modify, and distribute this software for any
36: * purpose with or without fee is hereby granted, provided that the above
37: * copyright notice and this permission notice appear in all copies, and that
38: * the name of Digital Equipment Corporation not be used in advertising or
39: * publicity pertaining to distribution of the document or software without
40: * specific, written prior permission.
41: *
42: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49: * SOFTWARE.
50: */
51:
52: /*
53: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
54: * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
55: *
56: * Permission to use, copy, modify, and distribute this software for any
57: * purpose with or without fee is hereby granted, provided that the above
58: * copyright notice and this permission notice appear in all copies.
59: *
60: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
61: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
62: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
63: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
65: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
66: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67: */
1.3 christos 68: #include <sys/cdefs.h>
1.1 christos 69: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 70: #ifdef notdef
1.1 christos 71: static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
1.9 christos 72: static const char rcsid[] = "Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp";
1.3 christos 73: #else
1.13 ! christos 74: __RCSID("$NetBSD: res_comp.c,v 1.12 2012/03/13 21:13:43 christos Exp $");
1.3 christos 75: #endif
1.1 christos 76: #endif /* LIBC_SCCS and not lint */
77:
78: #include "port_before.h"
1.4 christos 79:
80: #include "namespace.h"
1.1 christos 81: #include <sys/types.h>
82: #include <sys/param.h>
83: #include <netinet/in.h>
84: #include <arpa/nameser.h>
1.12 christos 85: #include <assert.h>
1.1 christos 86: #include <ctype.h>
87: #include <resolv.h>
88: #include <stdio.h>
89: #include <string.h>
90: #include <unistd.h>
91: #include "port_after.h"
92:
1.4 christos 93: #ifdef __weak_alias
94: __weak_alias(dn_expand,_dn_expand)
95: __weak_alias(dn_comp,__dn_comp)
1.6 christos 96: #if 0
1.4 christos 97: __weak_alias(dn_skipname,__dn_skipname)
98: __weak_alias(res_hnok,__res_hnok)
99: __weak_alias(res_ownok,__res_ownok)
100: __weak_alias(res_mailok,__res_mailok)
101: __weak_alias(res_dnok,__res_dnok)
102: #endif
1.5 christos 103: #endif
1.4 christos 104:
1.7 christos 105: /*%
1.1 christos 106: * Expand compressed domain name 'src' to full domain name.
1.7 christos 107: *
108: * \li 'msg' is a pointer to the begining of the message,
109: * \li 'eom' points to the first location after the message,
110: * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
111: * \li Return size of compressed name or -1 if there was an error.
1.1 christos 112: */
113: int
114: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
115: char *dst, int dstsiz)
116: {
117: int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
118:
119: if (n > 0 && dst[0] == '.')
120: dst[0] = '\0';
121: return (n);
122: }
123:
1.7 christos 124: /*%
1.1 christos 125: * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7 christos 126: *
127: * \li Return the size of the compressed name or -1.
128: * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1 christos 129: */
130: int
131: dn_comp(const char *src, u_char *dst, int dstsiz,
132: u_char **dnptrs, u_char **lastdnptr)
133: {
134: return (ns_name_compress(src, dst, (size_t)dstsiz,
1.11 christos 135: (void *)dnptrs,
136: (void *)lastdnptr));
1.1 christos 137: }
138:
1.7 christos 139: /*%
1.1 christos 140: * Skip over a compressed domain name. Return the size or -1.
141: */
142: int
143: dn_skipname(const u_char *ptr, const u_char *eom) {
144: const u_char *saveptr = ptr;
145:
146: if (ns_name_skip(&ptr, eom) == -1)
147: return (-1);
1.12 christos 148: _DIAGASSERT(__type_fit(int, ptr - saveptr));
149: return (int)(ptr - saveptr);
1.1 christos 150: }
151:
1.7 christos 152: /*%
1.1 christos 153: * Verify that a domain name uses an acceptable character set.
1.7 christos 154: *
1.1 christos 155: * Note the conspicuous absence of ctype macros in these definitions. On
156: * non-ASCII hosts, we can't depend on string literals or ctype macros to
157: * tell us anything about network-format data. The rest of the BIND system
158: * is not careful about this, but for some reason, we're doing it right here.
159: */
160: #define PERIOD 0x2e
161: #define hyphenchar(c) ((c) == 0x2d)
162: #define bslashchar(c) ((c) == 0x5c)
163: #define periodchar(c) ((c) == PERIOD)
164: #define asterchar(c) ((c) == 0x2a)
165: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
166: || ((c) >= 0x61 && (c) <= 0x7a))
167: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
168:
169: #define borderchar(c) (alphachar(c) || digitchar(c))
170: #define middlechar(c) (borderchar(c) || hyphenchar(c))
171: #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
172:
173: int
174: res_hnok(const char *dn) {
175: int pch = PERIOD, ch = *dn++;
176:
177: while (ch != '\0') {
178: int nch = *dn++;
179:
180: if (periodchar(ch)) {
1.2 christos 181: ;
1.1 christos 182: } else if (periodchar(pch)) {
183: if (!borderchar(ch))
184: return (0);
185: } else if (periodchar(nch) || nch == '\0') {
186: if (!borderchar(ch))
187: return (0);
188: } else {
189: if (!middlechar(ch))
190: return (0);
191: }
192: pch = ch, ch = nch;
193: }
194: return (1);
195: }
196:
1.7 christos 197: /*%
1.1 christos 198: * hostname-like (A, MX, WKS) owners can have "*" as their first label
199: * but must otherwise be as a host name.
200: */
201: int
202: res_ownok(const char *dn) {
203: if (asterchar(dn[0])) {
204: if (periodchar(dn[1]))
205: return (res_hnok(dn+2));
206: if (dn[1] == '\0')
207: return (1);
208: }
209: return (res_hnok(dn));
210: }
211:
1.7 christos 212: /*%
1.1 christos 213: * SOA RNAMEs and RP RNAMEs can have any printable character in their first
214: * label, but the rest of the name has to look like a host name.
215: */
216: int
217: res_mailok(const char *dn) {
218: int ch, escaped = 0;
219:
220: /* "." is a valid missing representation */
221: if (*dn == '\0')
222: return (1);
223:
224: /* otherwise <label>.<hostname> */
225: while ((ch = *dn++) != '\0') {
226: if (!domainchar(ch))
227: return (0);
228: if (!escaped && periodchar(ch))
229: break;
230: if (escaped)
231: escaped = 0;
232: else if (bslashchar(ch))
233: escaped = 1;
234: }
235: if (periodchar(ch))
236: return (res_hnok(dn));
237: return (0);
238: }
239:
1.7 christos 240: /*%
241: * This function is quite liberal, since RFC1034's character sets are only
1.1 christos 242: * recommendations.
243: */
244: int
245: res_dnok(const char *dn) {
246: int ch;
247:
248: while ((ch = *dn++) != '\0')
249: if (!domainchar(ch))
250: return (0);
251: return (1);
252: }
253:
254: #ifdef BIND_4_COMPAT
1.7 christos 255: /*%
1.1 christos 256: * This module must export the following externally-visible symbols:
257: * ___putlong
258: * ___putshort
259: * __getlong
260: * __getshort
261: * Note that one _ comes from C and the others come from us.
262: */
1.7 christos 263:
264: #ifdef SOLARIS2
265: #ifdef __putlong
266: #undef __putlong
267: #endif
268: #ifdef __putshort
269: #undef __putshort
270: #endif
271: #pragma weak putlong = __putlong
272: #pragma weak putshort = __putshort
273: #endif /* SOLARIS2 */
274:
1.1 christos 275: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
276: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
277: #ifndef __ultrix__
278: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
279: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
280: #endif /*__ultrix__*/
281: #endif /*BIND_4_COMPAT*/
1.7 christos 282:
283: /*! \file */
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