/**
Return 1 on success, 0 on failure.
*/
int _rrparse(struct message *m, struct resource *rr, int count, unsigned char **bufp)
{
int i;
for(i=0; i < count; i++)
{
_label(m, bufp, &(rr[i].name));
rr[i].type = net2short(bufp);
rr[i].rr_class = net2short(bufp);
rr[i].ttl = net2long(bufp);
rr[i].rdlength = net2short(bufp);
// if not going to overflow, make copy of source rdata
if(rr[i].rdlength + (*bufp - m->_buf) > MAX_PACKET_LEN || m->_len + rr[i].rdlength > MAX_PACKET_LEN) return 0;
rr[i].rdata = m->_packet + m->_len;
m->_len += rr[i].rdlength;
memcpy(rr[i].rdata,*bufp,rr[i].rdlength);
// parse commonly known ones
switch(rr[i].type)
{
case 1:
if(m->_len + 16 > MAX_PACKET_LEN) return 0;
rr[i].known.a.name = m->_packet + m->_len;
m->_len += 16;
sprintf(rr[i].known.a.name,"%d.%d.%d.%d",(*bufp)[0],(*bufp)[1],(*bufp)[2],(*bufp)[3]);
rr[i].known.a.ip = net2long(bufp);
break;
case 2:
_label(m, bufp, &(rr[i].known.ns.name));
break;
case 5:
_label(m, bufp, &(rr[i].known.cname.name));
break;
case 12:
_label(m, bufp, &(rr[i].known.ptr.name));
break;
case 33:
rr[i].known.srv.priority = net2short(bufp);
rr[i].known.srv.weight = net2short(bufp);
rr[i].known.srv.port = net2short(bufp);
_label(m, bufp, &(rr[i].known.srv.name));
break;
default:
*bufp += rr[i].rdlength;
}
}
return 1;
}
static int process_rrsection(jdns_list_t *dest, int count, const unsigned char *data, int size, const unsigned char **bufp)
{
int n;
int offset, at;
jdns_string_t *name = 0;
const unsigned char *buf;
buf = *bufp;
for(n = 0; n < count; ++n)
{
jdns_packet_resource_t *r;
offset = buf - data;
at = 0;
if(!readlabel(data + offset, size - offset, data, size, &at, &name))
goto error;
offset += at;
// need 10 more bytes
if(offset + 10 > size)
goto error;
buf = data + offset;
r = jdns_packet_resource_new();
r->qname = name;
name = 0;
r->qtype = net2short(&buf);
r->qclass = net2short(&buf);
r->ttl = net2long(&buf);
r->rdlength = net2short(&buf);
offset = buf - data;
// make sure we have enough for the rdata
if(size - offset < r->rdlength)
{
jdns_packet_resource_delete(r);
goto error;
}
r->rdata = jdns_copy_array(buf, r->rdlength);
buf += r->rdlength;
jdns_list_insert_value(dest, r, -1);
jdns_packet_resource_delete(r);
}
*bufp = buf;
return 1;
error:
jdns_string_delete(name);
return 0;
}
