private void GetResourceRecord(int i, ResourceRecordCollection Container)
{
//get resource (answer) name
string ResourceName = GetName();
//get resource type and class, usefull when using the ANY query
//type: two octec field
int TypeID = (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
Types ResourceType = (Types)TypeID;
//type: two octec field
int ClassID = (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
Classes ResourceClass = (Classes)ClassID;
//ttl: unsigned integer
int TTL_Seconds = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
//Get Resource Data Length
int RDLength = (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
//Parse Resource Data: 4 possible formats: A, Text, SOA and MX
switch (ResourceType)
{
case Types.A:
//Get IP Address Blocks
{
byte[] bs = new byte[] { (byte)(data[position++] & byte.MaxValue), (byte)(data[position++] & byte.MaxValue), (byte)(data[position++] & byte.MaxValue), (byte)(data[position++] & byte.MaxValue) };
string ResourceAddress = String.Concat(new object[] { bs[0], ".", bs[1], ".", bs[2], ".", bs[3] });
Address rrA = new Address(ResourceName, ResourceType, ResourceClass, TTL_Seconds, ResourceAddress);
Container.Add(rrA);
break;
}
case Types.AAAA:
{
//Get IP Address Blocks
ushort[] bs = new ushort[8];
for (int j = 0; j < 8; ++j)
{
bs[j] = (ushort)(((byte)(data[position + j * 2] & byte.MaxValue) << 8) | (byte)(data[position + j * 2 + 1] & byte.MaxValue));
}
position += 16;
string ResourceAddress = String.Concat(new object[] {
Convert.ToString(bs[0], 16), ":",
Convert.ToString(bs[1], 16), ":",
Convert.ToString(bs[2], 16), ":",
Convert.ToString(bs[3], 16), ":",
Convert.ToString(bs[4], 16), ":",
Convert.ToString(bs[5], 16), ":",
Convert.ToString(bs[6], 16), ":",
Convert.ToString(bs[7], 16)
});
Address rrA = new Address(ResourceName, ResourceType, ResourceClass, TTL_Seconds, ResourceAddress);
Container.Add(rrA);
break;
}
case Types.SOA:
{
//Extract Text Fields
string Server = GetName();
string Email = GetName();
//32 bit fields
long Serial = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
long Refresh = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
long Retry = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
long Expire = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
long Minimum = (data[position++] & byte.MaxValue) << 24 | (data[position++] & byte.MaxValue) << 16 | (data[position++] & byte.MaxValue) << 8 | data[position++] & byte.MaxValue;
OpenDNS.SOA rrSOA = new SOA(ResourceName, ResourceType, ResourceClass, TTL_Seconds, Server, Email, Serial, Refresh, Retry, Expire, Minimum);
Container.Add(rrSOA);
break;
}
case Types.CNAME:
case Types.MINFO:
case Types.NS:
case Types.PTR:
case Types.TXT:
//Simplest RDATA format, just a text string, shared by many
string ResourceDataText = GetName();
ResourceRecord rrTXT = new ResourceRecord(ResourceName, ResourceType, ResourceClass, TTL_Seconds, ResourceDataText);
Container.Add(rrTXT);
break;
case Types.MX:
int Rank = (data[position++] << 8) | (data[position++] & byte.MaxValue);
string Exchange = GetName();
MX rrMX = new MX(ResourceName, ResourceType, ResourceClass, TTL_Seconds, Rank, Exchange);
Container.Add(rrMX);
break;
default:
Trace.WriteLine("Resource type did not match: " + ResourceType.ToString(), "RUY QDNS");
break;
}
}