Annotation of src/lib/libc/nameser/ns_parse.c, Revision 1.6
1.6 ! christos 1: /* $NetBSD: ns_parse.c,v 1.5 2007/03/30 20:23:03 ghen Exp $ */
1.1 christos 2:
3: /*
4: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5: * Copyright (c) 1996,1999 by Internet Software Consortium.
6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19:
1.2 christos 20: #include <sys/cdefs.h>
1.1 christos 21: #ifndef lint
1.2 christos 22: #ifdef notdef
1.6 ! christos 23: static const char rcsid[] = "Id: ns_parse.c,v 1.9 2007/08/27 03:32:26 marka Exp";
1.2 christos 24: #else
1.6 ! christos 25: __RCSID("$NetBSD: ns_parse.c,v 1.5 2007/03/30 20:23:03 ghen Exp $");
1.2 christos 26: #endif
1.1 christos 27: #endif
28:
29: /* Import. */
30:
31: #include "port_before.h"
32:
33: #include <sys/types.h>
34:
35: #include <netinet/in.h>
36: #include <arpa/nameser.h>
37:
38: #include <errno.h>
39: #include <resolv.h>
40: #include <string.h>
41:
42: #include "port_after.h"
43:
44: /* Forward. */
45:
46: static void setsection(ns_msg *msg, ns_sect sect);
47:
48: /* Macros. */
49:
1.6 ! christos 50: #if !defined(SOLARIS2) || defined(__COVERITY__)
1.2 christos 51: #define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
1.4 christos 52: #else
53: #define RETERR(err) \
54: do { errno = (err); if (errno == errno) return (-1); } while (0)
55: #endif
1.1 christos 56:
57: /* Public. */
58:
59: /* These need to be in the same order as the nres.h:ns_flag enum. */
60: struct _ns_flagdata _ns_flagdata[16] = {
1.4 christos 61: { 0x8000, 15 }, /*%< qr. */
62: { 0x7800, 11 }, /*%< opcode. */
63: { 0x0400, 10 }, /*%< aa. */
64: { 0x0200, 9 }, /*%< tc. */
65: { 0x0100, 8 }, /*%< rd. */
66: { 0x0080, 7 }, /*%< ra. */
67: { 0x0040, 6 }, /*%< z. */
68: { 0x0020, 5 }, /*%< ad. */
69: { 0x0010, 4 }, /*%< cd. */
70: { 0x000f, 0 }, /*%< rcode. */
71: { 0x0000, 0 }, /*%< expansion (1/6). */
72: { 0x0000, 0 }, /*%< expansion (2/6). */
73: { 0x0000, 0 }, /*%< expansion (3/6). */
74: { 0x0000, 0 }, /*%< expansion (4/6). */
75: { 0x0000, 0 }, /*%< expansion (5/6). */
76: { 0x0000, 0 }, /*%< expansion (6/6). */
1.1 christos 77: };
78:
79: int ns_msg_getflag(ns_msg handle, int flag) {
1.2 christos 80: return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
1.1 christos 81: }
82:
83: int
84: ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
85: const u_char *optr = ptr;
86:
1.2 christos 87: for (; count > 0; count--) {
1.1 christos 88: int b, rdlength;
89:
90: b = dn_skipname(ptr, eom);
91: if (b < 0)
92: RETERR(EMSGSIZE);
93: ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
94: if (section != ns_s_qd) {
95: if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
96: RETERR(EMSGSIZE);
97: ptr += NS_INT32SZ/*TTL*/;
98: NS_GET16(rdlength, ptr);
99: ptr += rdlength/*RData*/;
100: }
101: }
102: if (ptr > eom)
103: RETERR(EMSGSIZE);
104: return (ptr - optr);
105: }
106:
107: int
108: ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
109: const u_char *eom = msg + msglen;
110: int i;
111:
112: memset(handle, 0x5e, sizeof *handle);
113: handle->_msg = msg;
114: handle->_eom = eom;
115: if (msg + NS_INT16SZ > eom)
116: RETERR(EMSGSIZE);
117: NS_GET16(handle->_id, msg);
118: if (msg + NS_INT16SZ > eom)
119: RETERR(EMSGSIZE);
120: NS_GET16(handle->_flags, msg);
121: for (i = 0; i < ns_s_max; i++) {
122: if (msg + NS_INT16SZ > eom)
123: RETERR(EMSGSIZE);
124: NS_GET16(handle->_counts[i], msg);
125: }
126: for (i = 0; i < ns_s_max; i++)
127: if (handle->_counts[i] == 0)
128: handle->_sections[i] = NULL;
129: else {
130: int b = ns_skiprr(msg, eom, (ns_sect)i,
131: handle->_counts[i]);
132:
133: if (b < 0)
134: return (-1);
135: handle->_sections[i] = msg;
136: msg += b;
137: }
138: if (msg != eom)
139: RETERR(EMSGSIZE);
140: setsection(handle, ns_s_max);
141: return (0);
142: }
143:
144: int
145: ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
146: int b;
1.4 christos 147: int tmp;
1.1 christos 148:
149: /* Make section right. */
1.4 christos 150: tmp = section;
151: if (tmp < 0 || section >= ns_s_max)
1.1 christos 152: RETERR(ENODEV);
153: if (section != handle->_sect)
154: setsection(handle, section);
155:
156: /* Make rrnum right. */
157: if (rrnum == -1)
158: rrnum = handle->_rrnum;
159: if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
160: RETERR(ENODEV);
161: if (rrnum < handle->_rrnum)
162: setsection(handle, section);
163: if (rrnum > handle->_rrnum) {
164: b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
165: rrnum - handle->_rrnum);
166:
167: if (b < 0)
168: return (-1);
169: handle->_msg_ptr += b;
170: handle->_rrnum = rrnum;
171: }
172:
173: /* Do the parse. */
174: b = dn_expand(handle->_msg, handle->_eom,
175: handle->_msg_ptr, rr->name, NS_MAXDNAME);
176: if (b < 0)
177: return (-1);
178: handle->_msg_ptr += b;
179: if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
180: RETERR(EMSGSIZE);
181: NS_GET16(rr->type, handle->_msg_ptr);
182: NS_GET16(rr->rr_class, handle->_msg_ptr);
183: if (section == ns_s_qd) {
184: rr->ttl = 0;
185: rr->rdlength = 0;
186: rr->rdata = NULL;
187: } else {
188: if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
189: RETERR(EMSGSIZE);
190: NS_GET32(rr->ttl, handle->_msg_ptr);
191: NS_GET16(rr->rdlength, handle->_msg_ptr);
192: if (handle->_msg_ptr + rr->rdlength > handle->_eom)
193: RETERR(EMSGSIZE);
194: rr->rdata = handle->_msg_ptr;
195: handle->_msg_ptr += rr->rdlength;
196: }
197: if (++handle->_rrnum > handle->_counts[(int)section])
198: setsection(handle, (ns_sect)((int)section + 1));
199:
200: /* All done. */
201: return (0);
202: }
203:
204: /* Private. */
205:
206: static void
207: setsection(ns_msg *msg, ns_sect sect) {
208: msg->_sect = sect;
209: if (sect == ns_s_max) {
210: msg->_rrnum = -1;
211: msg->_msg_ptr = NULL;
212: } else {
213: msg->_rrnum = 0;
214: msg->_msg_ptr = msg->_sections[(int)sect];
215: }
216: }
1.4 christos 217:
218: /*! \file */
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