netresolv/nameser/ns_parse.c

83 int ns_msg_getflag(ns_msg handle, int flag) {
84 	return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
113 ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
117 	handle->_msg = msg;
118 	handle->_eom = eom;
121 	NS_GET16(handle->_id, msg);
124 	NS_GET16(handle->_flags, msg);
128 		NS_GET16(handle->_counts[i], msg);
131 		if (handle->_counts[i] == 0)
132 			handle->_sections[i] = NULL;
135 					  handle->_counts[i]);
139 			handle->_sections[i] = msg;
144 	setsection(handle, ns_s_max);
149 ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
157 	if (section != handle->_sect)
158 		setsection(handle, section);
162 		rrnum = handle->_rrnum;
163 	if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
165 	if (rrnum < handle->_rrnum)
166 		setsection(handle, section);
167 	if (rrnum > handle->_rrnum) {
168 		b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
169 			      rrnum - handle->_rrnum);
173 		handle->_msg_ptr += b;
174 		handle->_rrnum = rrnum;
178 	b = dn_expand(handle->_msg, handle->_eom,
179 		      handle->_msg_ptr, rr->name, NS_MAXDNAME);
182 	handle->_msg_ptr += b;
183 	if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
185 	NS_GET16(rr->type, handle->_msg_ptr);
186 	NS_GET16(rr->rr_class, handle->_msg_ptr);
192 		if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
194 		NS_GET32(rr->ttl, handle->_msg_ptr);
195 		NS_GET16(rr->rdlength, handle->_msg_ptr);
196 		if (handle->_msg_ptr + rr->rdlength > handle->_eom)
198 		rr->rdata = handle->_msg_ptr;
199 		handle->_msg_ptr += rr->rdlength;
201 	if (++handle->_rrnum > handle->_counts[(int)section])
202 		setsection(handle, (ns_sect)((int)section + 1));
212 ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) {
220 	if (section != handle->_sect)
221 		setsection(handle, section);
225 		rrnum = handle->_rrnum;
226 	if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
228 	if (rrnum < handle->_rrnum)
229 		setsection(handle, section);
230 	if (rrnum > handle->_rrnum) {
231 		b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
232 			      rrnum - handle->_rrnum);
236 		handle->_msg_ptr += b;
237 		handle->_rrnum = rrnum;
241 	b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr,
245 	handle->_msg_ptr += b;
246 	if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
248 	NS_GET16(rr->type, handle->_msg_ptr);
249 	NS_GET16(rr->rr_class, handle->_msg_ptr);
255 		if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
257 		NS_GET32(rr->ttl, handle->_msg_ptr);
258 		NS_GET16(rr->rdlength, handle->_msg_ptr);
259 		if (handle->_msg_ptr + rr->rdlength > handle->_eom)
261 		rr->rdata = handle->_msg_ptr;
262 		handle->_msg_ptr += rr->rdlength;
264 	if (++handle->_rrnum > handle->_counts[(int)section])
265 		setsection(handle, (ns_sect)((int)section + 1));