public Connection(Tamir.IPLib.Packets.TCPPacket packet)
{
m_srcIp = packet.SourceAddress;
m_dstIp = packet.DestinationAddress;
m_srcPort = (ushort)packet.SourcePort;
m_dstPort = (ushort)packet.DestinationPort;
}
public static void MakeValid(TCPPacket tcp)
{
tcp.IPVersion = 4;
tcp.IPTotalLength = tcp.Bytes.Length - 14; //Set the correct IP length
tcp.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;
tcp.TCPHeaderLength = TCPFields_Fields.TCP_HEADER_LEN; //Set the correct TCP header length
//Calculate checksums
tcp.ComputeIPChecksum();
tcp.ComputeTCPChecksum();
}
public static TCPPacket RandomPacket(int size)
{
if (size < 54)
{
throw new Exception("Size should be at least 54 (Eth + IP + TCP)");
}
byte[] bytes = new byte[size];
Tamir.IPLib.Util.Rand.Instance.GetBytes(bytes);
TCPPacket tcp = new TCPPacket(14, bytes, true);
MakeValid(tcp);
return(tcp);
}
public TCPPacket processPacket(TCPPacket packet)
{
if (packet.FragmentFlags == 0x04) // not Fragmented
{
return packet;
}
else if (packet.FragmentFlags == 0x00 && packet.Data.Length == PacketReassembler.PACKET_LENGHT) //maybe Fragmented?
{
buffer.Add(packet);
}
else if (packet.FragmentFlags == 0x00
&& packet.Data.Length != PacketReassembler.PACKET_LENGHT) //maybe Fragmented?
{
buffer.Add(packet);
long ackNr = packet.AcknowledgmentNumber;
int size = packet.HeaderLength;
foreach (TCPPacket p in buffer)
{
if (p.AcknowledgmentNumber == ackNr)
{
size += p.Data.Length;
}
}
if (size == packet.HeaderLength)
{
return null;
}
byte[] data = new byte[size];
Array.Copy(packet.Header, 0, data, 0, packet.HeaderLength);
int pos = packet.HeaderLength;
foreach (TCPPacket p in buffer)
{
if (p.AcknowledgmentNumber == ackNr)
{
Array.Copy(p.Data, 0, data, pos, p.Data.Length);
pos += p.Data.Length;
buffer.Remove(p);
}
}
TCPPacket reassembledPacket = new TCPPacket((int)size, data);
return reassembledPacket;
}
return null;
}
public static TCPPacket RandomPacket(int size)
{
if(size<54)
throw new Exception("Size should be at least 54 (Eth + IP + TCP)");
byte[] bytes = new byte[size];
Tamir.IPLib.Util.Rand.Instance.GetBytes(bytes);
TCPPacket tcp = new TCPPacket(14, bytes, true);
MakeValid(tcp);
return tcp;
}
public static void MakeValid(TCPPacket tcp)
{
tcp.IPVersion = 4;
tcp.IPTotalLength = tcp.Bytes.Length-14; //Set the correct IP length
tcp.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;
tcp.TCPHeaderLength = TCPFields_Fields.TCP_HEADER_LEN; //Set the correct TCP header length
//Calculate checksums
tcp.ComputeIPChecksum();
tcp.ComputeTCPChecksum();
}
private static void Save(TCPPacket _TCPPacket, Direction _Direction, Client _Client, SortedList<int, byte[]> _Stream)
{
if (!_Stream.ContainsKey(_TCPPacket.Id))
{
string s = "<<<<<<<<<" + _Direction + " " + _Client.ip + ":" + _Client.Port + " id:" + _Client.i + " bytes:" + _TCPPacket.Data.Length + ">>>>>>>>";
Console.WriteLine(s); Trace.WriteLine(s);
Trace.WriteLine(ASCIIEncoding.ASCII.GetString(_TCPPacket.Data));
_Stream.Add(_TCPPacket.Id, _TCPPacket.Data);
using (FileStream _FileStream = new FileStream(_Client.i + " " + _Direction + ".html", FileMode.Create, FileAccess.Write))
{
using (MemoryStream _MemoryStream = new MemoryStream())
{
for (int i = _Stream.Keys.First(); _Stream.ContainsKey(i); i++)
{
_FileStream.Write(_Stream[i]);
}
}
}
}
}
private string getPacketId(TCPPacket packet)
{
return string.Format("{0}:{1} - {2}:{3}", packet.SourceAddress, packet.SourcePort, packet.DestinationAddress, packet.DestinationPort);
}
public static void SendTcpSyn(NetworkDevice dev)
{
byte[] bytes = new byte[54];
TCPPacket tcp = new TCPPacket(lLen, bytes, true);
//Ethernet fields
tcp.SourceHwAddress = dev.MacAddress; //Set the source mac of the local device
tcp.DestinationHwAddress = destMAC; //Set the dest MAC of the gateway
tcp.EthernetProtocol = EthernetProtocols_Fields.IP;
//IP fields
tcp.DestinationAddress = destIP; //The IP of the destination host
tcp.SourceAddress = dev.IpAddress; //The IP of the local device
tcp.IPProtocol = IPProtocols_Fields.TCP;
tcp.TimeToLive = 20;
tcp.Id = 100;
tcp.Version = 4;
tcp.IPTotalLength = bytes.Length-lLen; //Set the correct IP length
tcp.IPHeaderLength = IPFields_Fields.IP_HEADER_LEN;
//TCP fields
tcp.SourcePort = sourcePort; //The TCP source port
tcp.DestinationPort = destPort; //The TCP dest port
tcp.Syn = true; //Set the SYN flag on
tcp.WindowSize = 555;
tcp.AcknowledgementNumber = 1000;
tcp.SequenceNumber = 1000;
tcp.TCPHeaderLength = TCPFields_Fields.TCP_HEADER_LEN; //Set the correct TCP header length
//tcp.SetData( System.Text.Encoding.ASCII.GetBytes("HELLO") );
//Calculate checksums
tcp.ComputeIPChecksum();
tcp.ComputeTCPChecksum();
dev.PcapOpen(true, 20);
//Set a filter to capture only replies
dev.PcapSetFilter("ip src "+destIP+" and ip dst "+
dev.IpAddress+" and tcp src port "+destPort+" and tcp dst port "+sourcePort);
//Send the packet
Console.Write("Sending packet: "+tcp+"...");
dev.PcapSendPacket(tcp);
Console.WriteLine("Packet sent.");
//Holds the reply
Packet reply;
//Wait till you get a reply
while((reply=dev.PcapGetNextPacket())==null);
//print the reply
Console.WriteLine("Reply received: "+reply);
dev.PcapClose();
}
