internal static void ProcessDNSRequest(byte[] data, string clientIP, int clientPort, string sourceIP, int sourcePort)
{
DNSPacket packet = new DNSPacket(data)
{
Host = Program.argDNSHost,
TTL = uint.Parse(Program.argDNSTTL)
};
DNSListener listener = new DNSListener(UInt32.Parse(Program.argDNSTTL));
if (!packet.Header.IsDynamicUpdateRequest())
{
if (packet.Header.IsQuery())
{
if (listener.Check(packet.Question.Name, packet.Question.Type, clientIP, out string message))
{
byte[] buffer = packet.GetBytes(UInt32.Parse(Program.argDNSTTL), Program.dnsSerial, Program.argSpooferIP, Program.argSpooferIPv6);
if (!Utilities.ArrayIsNullOrEmpty(buffer))
{
UDPSocket.SendTo(clientIP, clientPort, sourceIP, sourcePort, buffer, false);
}
}
Output.SpooferOutput("DNS", packet.Question.Type, packet.Question.Name, clientIP, message);
}
}
else
{
byte[] flags = new byte[2] {
0xa8, 0x05
};
byte[] dnsPayload = new byte[data.Length - 2];
System.Buffer.BlockCopy(data, 2, dnsPayload, 0, dnsPayload.Length);
MemoryStream dnsMemoryStream = new MemoryStream();
dnsMemoryStream.Write(data, 0, data.Length);
dnsMemoryStream.Position = 2;
dnsMemoryStream.Write(flags, 0, 2);
UDPSocket.SendTo(clientIP, clientPort, sourceIP, sourcePort, dnsMemoryStream.ToArray(), false);
}
}
protected virtual void ProcessRequest(byte[] data, UDPListener udpListener, IPEndPoint ipEndPoint, string replyIP, string replyIPv6)
{
string clientIP = ipEndPoint.Address.ToString();
DNSPacket packet = new DNSPacket(data)
{
Host = this.Host,
TTL = this.TTL
};
if (packet.Header.IsQuery())
{
if (!packet.Header.IsDynamicUpdateRequest())
{
if (Check(packet.Question.Name, packet.Question.Type, clientIP, out string message))
{
byte[] buffer;
buffer = packet.GetBytes(this.TTL, this.Serial, replyIP, replyIPv6);
SendTo(buffer, udpListener, ipEndPoint);
}
Output("DNS", clientIP, packet.Question.Name, packet.Question.Type, message);
}
else
{
byte[] flags = new byte[2] {
0xa8, 0x05
};
byte[] dnsPayload = new byte[data.Length - 2];
System.Buffer.BlockCopy(data, 2, dnsPayload, 0, dnsPayload.Length);
MemoryStream dnsMemoryStream = new MemoryStream();
dnsMemoryStream.Write(data, 0, data.Length);
dnsMemoryStream.Position = 2;
dnsMemoryStream.Write(flags, 0, 2);
SendTo(dnsMemoryStream.ToArray(), udpListener, ipEndPoint);
}
}
}