internal DnsResourceRecordIPAddress(DnsResourceRecord rr, int address_size)
{
CopyFrom(rr);
ArraySegment<byte> segment = rr.Data;
var bytes = new byte[address_size];
Buffer.BlockCopy(segment.Array, segment.Offset, bytes, 0, address_size);
address = new IPAddress(bytes);
}
internal void CopyFrom(DnsResourceRecord rr)
{
name = rr.name;
type = rr.type;
klass = rr.klass;
ttl = rr.ttl;
rdlength = rr.rdlength;
m_rdata = rr.m_rdata;
}
internal static DnsResourceRecord CreateFromBuffer(DnsPacket packet, int size, ref int offset)
{
string pname = packet.ReadName(ref offset);
var ptype = (DnsType) packet.ReadUInt16(ref offset);
var pclass = (DnsClass) packet.ReadUInt16(ref offset);
int pttl = packet.ReadInt32(ref offset);
ushort prdlength = packet.ReadUInt16(ref offset);
var rr = new DnsResourceRecord();
rr.name = pname;
rr.type = ptype;
rr.klass = pclass;
rr.ttl = pttl;
rr.rdlength = prdlength;
rr.m_rdata = new ArraySegment<byte>(packet.Packet, offset, prdlength);
offset += prdlength;
switch (pclass)
{
case DnsClass.IN:
switch (ptype)
{
case DnsType.A:
rr = new DnsResourceRecordA(rr);
break;
case DnsType.AAAA:
rr = new DnsResourceRecordAAAA(rr);
break;
case DnsType.CNAME:
rr = new DnsResourceRecordCName(rr);
break;
case DnsType.PTR:
rr = new DnsResourceRecordPTR(rr);
break;
default:
break;
}
break;
default:
break;
}
return rr;
}
internal DnsResourceRecordPTR(DnsResourceRecord rr)
{
CopyFrom(rr);
int offset = rr.Data.Offset;
dname = DnsPacket.ReadName(rr.Data.Array, ref offset);
}
internal DnsResourceRecordAAAA(DnsResourceRecord rr)
: base(rr, 16)
{
}
internal DnsResourceRecordA(DnsResourceRecord rr)
: base(rr, 4)
{
}