Annotation of src/lib/libc/nameser/ns_parse.c, Revision 1.6.14.1
1.6.14.1! riz 1: /* $NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos 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
1.6.14.1! riz 23: static const char rcsid[] = "Id: ns_parse.c,v 1.10 2009/01/23 19:59:16 each Exp";
1.2 christos 24: #else
1.6.14.1! riz 25: __RCSID("$NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos 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:
1.6.14.1! riz 57: #define PARSE_FMT_PRESO 0 /* Parse using presentation-format names */
! 58: #define PARSE_FMT_WIRE 1 /* Parse using network-format names */
! 59:
1.1 christos 60: /* Public. */
61:
62: /* These need to be in the same order as the nres.h:ns_flag enum. */
63: struct _ns_flagdata _ns_flagdata[16] = {
1.4 christos 64: { 0x8000, 15 }, /*%< qr. */
65: { 0x7800, 11 }, /*%< opcode. */
66: { 0x0400, 10 }, /*%< aa. */
67: { 0x0200, 9 }, /*%< tc. */
68: { 0x0100, 8 }, /*%< rd. */
69: { 0x0080, 7 }, /*%< ra. */
70: { 0x0040, 6 }, /*%< z. */
71: { 0x0020, 5 }, /*%< ad. */
72: { 0x0010, 4 }, /*%< cd. */
73: { 0x000f, 0 }, /*%< rcode. */
74: { 0x0000, 0 }, /*%< expansion (1/6). */
75: { 0x0000, 0 }, /*%< expansion (2/6). */
76: { 0x0000, 0 }, /*%< expansion (3/6). */
77: { 0x0000, 0 }, /*%< expansion (4/6). */
78: { 0x0000, 0 }, /*%< expansion (5/6). */
79: { 0x0000, 0 }, /*%< expansion (6/6). */
1.1 christos 80: };
81:
82: int ns_msg_getflag(ns_msg handle, int flag) {
1.2 christos 83: return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
1.1 christos 84: }
85:
86: int
87: ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
88: const u_char *optr = ptr;
89:
1.2 christos 90: for (; count > 0; count--) {
1.1 christos 91: int b, rdlength;
92:
93: b = dn_skipname(ptr, eom);
94: if (b < 0)
95: RETERR(EMSGSIZE);
96: ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
97: if (section != ns_s_qd) {
98: if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
99: RETERR(EMSGSIZE);
100: ptr += NS_INT32SZ/*TTL*/;
101: NS_GET16(rdlength, ptr);
102: ptr += rdlength/*RData*/;
103: }
104: }
105: if (ptr > eom)
106: RETERR(EMSGSIZE);
107: return (ptr - optr);
108: }
109:
110: int
111: ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
112: const u_char *eom = msg + msglen;
113: int i;
114:
115: handle->_msg = msg;
116: handle->_eom = eom;
117: if (msg + NS_INT16SZ > eom)
118: RETERR(EMSGSIZE);
119: NS_GET16(handle->_id, msg);
120: if (msg + NS_INT16SZ > eom)
121: RETERR(EMSGSIZE);
122: NS_GET16(handle->_flags, msg);
123: for (i = 0; i < ns_s_max; i++) {
124: if (msg + NS_INT16SZ > eom)
125: RETERR(EMSGSIZE);
126: NS_GET16(handle->_counts[i], msg);
127: }
128: for (i = 0; i < ns_s_max; i++)
129: if (handle->_counts[i] == 0)
130: handle->_sections[i] = NULL;
131: else {
132: int b = ns_skiprr(msg, eom, (ns_sect)i,
133: handle->_counts[i]);
134:
135: if (b < 0)
136: return (-1);
137: handle->_sections[i] = msg;
138: msg += b;
139: }
140: if (msg != eom)
141: RETERR(EMSGSIZE);
142: setsection(handle, ns_s_max);
143: return (0);
144: }
145:
146: int
147: ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
148: int b;
1.4 christos 149: int tmp;
1.1 christos 150:
151: /* Make section right. */
1.4 christos 152: tmp = section;
153: if (tmp < 0 || section >= ns_s_max)
1.1 christos 154: RETERR(ENODEV);
155: if (section != handle->_sect)
156: setsection(handle, section);
157:
158: /* Make rrnum right. */
159: if (rrnum == -1)
160: rrnum = handle->_rrnum;
161: if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
162: RETERR(ENODEV);
163: if (rrnum < handle->_rrnum)
164: setsection(handle, section);
165: if (rrnum > handle->_rrnum) {
166: b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
167: rrnum - handle->_rrnum);
168:
169: if (b < 0)
170: return (-1);
171: handle->_msg_ptr += b;
172: handle->_rrnum = rrnum;
173: }
174:
175: /* Do the parse. */
176: b = dn_expand(handle->_msg, handle->_eom,
177: handle->_msg_ptr, rr->name, NS_MAXDNAME);
178: if (b < 0)
179: return (-1);
180: handle->_msg_ptr += b;
181: if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
182: RETERR(EMSGSIZE);
183: NS_GET16(rr->type, handle->_msg_ptr);
184: NS_GET16(rr->rr_class, handle->_msg_ptr);
185: if (section == ns_s_qd) {
186: rr->ttl = 0;
187: rr->rdlength = 0;
188: rr->rdata = NULL;
189: } else {
190: if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
191: RETERR(EMSGSIZE);
192: NS_GET32(rr->ttl, handle->_msg_ptr);
193: NS_GET16(rr->rdlength, handle->_msg_ptr);
194: if (handle->_msg_ptr + rr->rdlength > handle->_eom)
195: RETERR(EMSGSIZE);
196: rr->rdata = handle->_msg_ptr;
197: handle->_msg_ptr += rr->rdlength;
198: }
199: if (++handle->_rrnum > handle->_counts[(int)section])
200: setsection(handle, (ns_sect)((int)section + 1));
201:
202: /* All done. */
203: return (0);
204: }
205:
1.6.14.1! riz 206: /*
! 207: * This is identical to the above but uses network-format (uncompressed) names.
! 208: */
! 209: int
! 210: ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) {
! 211: int b;
! 212: int tmp;
! 213:
! 214: /* Make section right. */
! 215: tmp = section;
! 216: if (tmp < 0 || section >= ns_s_max)
! 217: RETERR(ENODEV);
! 218: if (section != handle->_sect)
! 219: setsection(handle, section);
! 220:
! 221: /* Make rrnum right. */
! 222: if (rrnum == -1)
! 223: rrnum = handle->_rrnum;
! 224: if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
! 225: RETERR(ENODEV);
! 226: if (rrnum < handle->_rrnum)
! 227: setsection(handle, section);
! 228: if (rrnum > handle->_rrnum) {
! 229: b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
! 230: rrnum - handle->_rrnum);
! 231:
! 232: if (b < 0)
! 233: return (-1);
! 234: handle->_msg_ptr += b;
! 235: handle->_rrnum = rrnum;
! 236: }
! 237:
! 238: /* Do the parse. */
! 239: b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr,
! 240: rr->nname, NS_MAXNNAME, &rr->nnamel);
! 241: if (b < 0)
! 242: return (-1);
! 243: handle->_msg_ptr += b;
! 244: if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
! 245: RETERR(EMSGSIZE);
! 246: NS_GET16(rr->type, handle->_msg_ptr);
! 247: NS_GET16(rr->rr_class, handle->_msg_ptr);
! 248: if (section == ns_s_qd) {
! 249: rr->ttl = 0;
! 250: rr->rdlength = 0;
! 251: rr->rdata = NULL;
! 252: } else {
! 253: if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
! 254: RETERR(EMSGSIZE);
! 255: NS_GET32(rr->ttl, handle->_msg_ptr);
! 256: NS_GET16(rr->rdlength, handle->_msg_ptr);
! 257: if (handle->_msg_ptr + rr->rdlength > handle->_eom)
! 258: RETERR(EMSGSIZE);
! 259: rr->rdata = handle->_msg_ptr;
! 260: handle->_msg_ptr += rr->rdlength;
! 261: }
! 262: if (++handle->_rrnum > handle->_counts[(int)section])
! 263: setsection(handle, (ns_sect)((int)section + 1));
! 264:
! 265: /* All done. */
! 266: return (0);
! 267: }
! 268:
1.1 christos 269: /* Private. */
270:
271: static void
272: setsection(ns_msg *msg, ns_sect sect) {
273: msg->_sect = sect;
274: if (sect == ns_s_max) {
275: msg->_rrnum = -1;
276: msg->_msg_ptr = NULL;
277: } else {
278: msg->_rrnum = 0;
279: msg->_msg_ptr = msg->_sections[(int)sect];
280: }
281: }
1.4 christos 282:
283: /*! \file */
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