public NetworkTcpSession(Packets.TcpPacket tcpSynPacket, NetworkHost clientHost, NetworkHost serverHost, ISessionProtocolFinderFactory protocolFinderFactory)
{
if (tcpSynPacket.FlagBits.Synchronize) //It's normal to start the session with a SYN flag
{
FiveTuple fiveTuple = new FiveTuple(clientHost, tcpSynPacket.SourcePort, serverHost, tcpSynPacket.DestinationPort, FiveTuple.TransportProtocol.TCP);
this.flow = new NetworkFlow(fiveTuple, tcpSynPacket.ParentFrame.Timestamp, tcpSynPacket.ParentFrame.Timestamp, 0, 0);
//this.synPacketTimestamp=tcpSynPacket.ParentFrame.Timestamp;
//this.clientHost=clientHost;
//this.serverHost=serverHost;
//this.clientTcpPort=tcpSynPacket.SourcePort;
//this.serverTcpPort=tcpSynPacket.DestinationPort;
this.synPacketReceived = false;
this.synAckPacketReceived = false;
this.finPacketReceived = false;
this.clientToServerFinPacketSequenceNumber = UInt32.MaxValue;
this.serverToClientFinPacketSequenceNumber = UInt32.MaxValue;
this.sessionEstablished = false;
this.sessionClosed = false;
this.startFrameNumber = tcpSynPacket.ParentFrame.FrameNumber;
this.clientToServerTcpDataStream = null;
this.serverToClientTcpDataStream = null;
this.protocolFinder = protocolFinderFactory.CreateProtocolFinder(this.flow, this.startFrameNumber);
}
else
{
throw new Exception("SYN flag not set on TCP packet");
}
}
internal void SetTcpData(Packets.TcpPacket tcpPacket)
{
this.sourceTcpPort = tcpPacket.SourcePort;
this.destinationTcpPort = tcpPacket.DestinationPort;
this.tcpPacketByteCount = tcpPacket.PacketByteCount;
//this.sourceHost.AddSentPacketFromTcpPort(tcpPacket.SourcePort);//this info is in the NetworkPacketList instead
if (tcpPacket.FlagBits.Synchronize)
{
this.tcpSynFlag = true;
if (tcpPacket.FlagBits.Acknowledgement)
{
this.tcpSynAckFlag = true;
if (!sourceHost.TcpPortIsOpen(tcpPacket.SourcePort))
{
this.sourceHost.AddOpenTcpPort(tcpPacket.SourcePort);
}
}
}
}
public override IEnumerable <AbstractPacket> GetSubPackets(bool includeSelfReference)
{
if (includeSelfReference)
{
yield return(this);
}
if (PacketStartIndex + 40 < PacketEndIndex)
{
AbstractPacket packet;
try {
if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.TCP)
{
//TCP packet
packet = new TcpPacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);//bugg?
}
else if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.UDP)
{
//UDP packet
packet = new UdpPacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
else if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.GRE)
{
//GRE packet
packet = new GrePacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
else
{
packet = new RawPacket(ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
}
catch (Exception) {
packet = new RawPacket(ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
yield return(packet);
foreach (AbstractPacket subPacket in packet.GetSubPackets(false))
{
yield return(subPacket);
}
}
}
public bool TryAddPacket(Packets.TcpPacket tcpPacket, NetworkHost sourceHost, NetworkHost destinationHost)
{
if (this.sessionClosed)
{
return(false);
}
//Make sure the hosts are correct
if (sourceHost == this.ClientHost && tcpPacket.SourcePort == this.ClientTcpPort)//client -> server
{
if (destinationHost != this.ServerHost)
{
return(false);
}
if (tcpPacket.SourcePort != this.ClientTcpPort)
{
return(false);
}
if (tcpPacket.DestinationPort != this.ServerTcpPort)
{
return(false);
}
}
else if (sourceHost == this.ServerHost && tcpPacket.SourcePort == this.ServerTcpPort)//server -> client
{
if (destinationHost != ClientHost)
{
return(false);
}
if (tcpPacket.SourcePort != ServerTcpPort)
{
return(false);
}
if (tcpPacket.DestinationPort != ClientTcpPort)
{
return(false);
}
}
else//unknown direction
{
return(false);
}
//this.latestPacketTimestamp=tcpPacket.ParentFrame.Timestamp;
this.flow.EndTime = tcpPacket.ParentFrame.Timestamp;
//Check TCP handshake
if (!this.synPacketReceived) //SYN (client->server)
{
if (tcpPacket.FlagBits.Synchronize && sourceHost == this.ClientHost)
{
this.synPacketReceived = true;
}
else
{
return(false);
}
}
else if (!this.synAckPacketReceived) //SYN+ACK (server->client)
{
if (tcpPacket.FlagBits.Synchronize && tcpPacket.FlagBits.Acknowledgement && sourceHost == this.ServerHost)
{
this.synAckPacketReceived = true;
}
else
{
return(false);
}
}
else if (!this.sessionEstablished) //ACK (client->server)
{
if (tcpPacket.FlagBits.Acknowledgement && sourceHost == this.ClientHost)
{
this.SetEstablished(tcpPacket.SequenceNumber, tcpPacket.AcknowledgmentNumber);
}
else
{
return(false);
}
}
//FIN and RST is handeled lower down
//else{//an established and not closed session!
if (tcpPacket.PayloadDataLength > 0)
{
this.protocolFinder.AddPacket(tcpPacket, sourceHost, destinationHost);
try {
//If we've come this far the packet should be allright for the networkSession
byte[] tcpSegmentData = tcpPacket.GetTcpPacketPayloadData();
//now add the data to the server to calculate service statistics for the open port
NetworkServiceMetadata networkServiceMetadata = null;
lock (this.ServerHost.NetworkServiceMetadataList) {
if (!this.ServerHost.NetworkServiceMetadataList.ContainsKey(this.ServerTcpPort))
{
networkServiceMetadata = new NetworkServiceMetadata(this.ServerHost, this.ServerTcpPort);
this.ServerHost.NetworkServiceMetadataList.Add(this.ServerTcpPort, networkServiceMetadata);
}
else
{
networkServiceMetadata = this.ServerHost.NetworkServiceMetadataList[this.ServerTcpPort];
}
}
//now, lets extract some data from the TCP packet!
if (sourceHost == this.ServerHost && tcpPacket.SourcePort == this.ServerTcpPort)
{
networkServiceMetadata.OutgoingTraffic.AddTcpPayloadData(tcpSegmentData);
//this.clientToServerTcpDataStream.AddTcpData(tcpPacket.SequenceNumber, tcpSegmentData);
if (this.serverToClientTcpDataStream == null)
{
this.serverToClientTcpDataStream = new TcpDataStream(tcpPacket.SequenceNumber, false, this);
}
if (this.requiredNextTcpDataStreamIsClientToServer == null && this.serverToClientTcpDataStream.TotalByteCount == 0)
{
this.requiredNextTcpDataStreamIsClientToServer = false;
}
this.serverToClientTcpDataStream.AddTcpData(tcpPacket.SequenceNumber, tcpSegmentData);
}
else
{
networkServiceMetadata.IncomingTraffic.AddTcpPayloadData(tcpSegmentData);
//this.serverToClientTcpDataStream.AddTcpData(tcpPacket.SequenceNumber, tcpSegmentData);
if (this.clientToServerTcpDataStream == null)
{
this.clientToServerTcpDataStream = new TcpDataStream(tcpPacket.SequenceNumber, true, this);
}
if (this.requiredNextTcpDataStreamIsClientToServer == null && this.clientToServerTcpDataStream.TotalByteCount == 0)
{
this.requiredNextTcpDataStreamIsClientToServer = true;
}
this.clientToServerTcpDataStream.AddTcpData(tcpPacket.SequenceNumber, tcpSegmentData);
}
}
catch (Exception ex) {
if (!tcpPacket.ParentFrame.QuickParse)
{
tcpPacket.ParentFrame.Errors.Add(new Frame.Error(tcpPacket.ParentFrame, tcpPacket.PacketStartIndex, tcpPacket.PacketEndIndex, ex.Message));
}
return(false);
}
}
//}
//se if stream should be closed
if (tcpPacket.FlagBits.Reset)//close no matter what
{
this.Close();
}
else if (tcpPacket.FlagBits.Fin)//close nicely
{
if (!this.finPacketReceived)
{
this.finPacketReceived = true;
if (sourceHost == this.ServerHost && tcpPacket.SourcePort == this.ServerTcpPort)
{
this.serverToClientFinPacketSequenceNumber = tcpPacket.SequenceNumber;
}
else
{
this.clientToServerFinPacketSequenceNumber = tcpPacket.SequenceNumber;
}
}
else if (tcpPacket.FlagBits.Acknowledgement)//fin+ack
{
this.Close();
}
}
return(true);
}
/// <summary>
/// Creates a truncated TCP session where the initial 3 way handshake is missing
/// </summary>
/// <param name="sourceHost"></param>
/// <param name="destinationHost"></param>
/// <param name="tcpPacket"></param>
public NetworkTcpSession(NetworkHost sourceHost, NetworkHost destinationHost, Packets.TcpPacket tcpPacket, ISessionProtocolFinderFactory protocolFinderFactory)
{
//this part is used to create a cropped (truncated) session where the beginning is missing!
//this.synPacketTimestamp=tcpPacket.ParentFrame.Timestamp;
this.synPacketReceived = true;
this.synAckPacketReceived = true;
this.finPacketReceived = false;
this.sessionEstablished = false;//I will change this one soon,...
this.sessionClosed = false;
this.startFrameNumber = tcpPacket.ParentFrame.FrameNumber;
this.clientToServerTcpDataStream = null;
this.serverToClientTcpDataStream = null;
//now let's do a qualified guess of who is the server and who is client...
FiveTuple fiveTuple;
System.Collections.Generic.List <ApplicationLayerProtocol> sourcePortProtocols = new List <ApplicationLayerProtocol>(TcpPortProtocolFinder.GetProbableApplicationLayerProtocols(tcpPacket.SourcePort, tcpPacket.SourcePort));
System.Collections.Generic.List <ApplicationLayerProtocol> destinationPortProtocols = new List <ApplicationLayerProtocol>(TcpPortProtocolFinder.GetProbableApplicationLayerProtocols(tcpPacket.DestinationPort, tcpPacket.DestinationPort));
if (sourcePortProtocols.Count > destinationPortProtocols.Count) //packet is server -> client
//this.clientHost=destinationHost;
//this.serverHost=sourceHost;
//this.clientTcpPort=tcpPacket.DestinationPort;
//this.serverTcpPort=tcpPacket.SourcePort;
{
fiveTuple = new FiveTuple(destinationHost, tcpPacket.DestinationPort, sourceHost, tcpPacket.SourcePort, FiveTuple.TransportProtocol.TCP);
this.flow = new NetworkFlow(fiveTuple, tcpPacket.ParentFrame.Timestamp, tcpPacket.ParentFrame.Timestamp, 0, 0);
this.SetEstablished(tcpPacket.AcknowledgmentNumber, tcpPacket.SequenceNumber);
}
else if (destinationPortProtocols.Count > 0) //packet is client -> server
//this.clientHost=sourceHost;
//this.serverHost=destinationHost;
//this.clientTcpPort=tcpPacket.SourcePort;
//this.serverTcpPort=tcpPacket.DestinationPort;
{
fiveTuple = new FiveTuple(sourceHost, tcpPacket.SourcePort, destinationHost, tcpPacket.DestinationPort, FiveTuple.TransportProtocol.TCP);
this.flow = new NetworkFlow(fiveTuple, tcpPacket.ParentFrame.Timestamp, tcpPacket.ParentFrame.Timestamp, 0, 0);
this.SetEstablished(tcpPacket.SequenceNumber, tcpPacket.AcknowledgmentNumber);
}
else if (tcpPacket.SourcePort < tcpPacket.DestinationPort)//packet is server -> client
//this.clientHost=destinationHost;
//this.serverHost=sourceHost;
//this.clientTcpPort=tcpPacket.DestinationPort;
//this.serverTcpPort=tcpPacket.SourcePort;
{
fiveTuple = new FiveTuple(destinationHost, tcpPacket.DestinationPort, sourceHost, tcpPacket.SourcePort, FiveTuple.TransportProtocol.TCP);
this.flow = new NetworkFlow(fiveTuple, tcpPacket.ParentFrame.Timestamp, tcpPacket.ParentFrame.Timestamp, 0, 0);
this.SetEstablished(tcpPacket.AcknowledgmentNumber, tcpPacket.SequenceNumber);
}
else //packet is client -> server
//this.clientHost=sourceHost;
//this.serverHost=destinationHost;
//this.clientTcpPort=tcpPacket.SourcePort;
//this.serverTcpPort=tcpPacket.DestinationPort;
{
fiveTuple = new FiveTuple(sourceHost, tcpPacket.SourcePort, destinationHost, tcpPacket.DestinationPort, FiveTuple.TransportProtocol.TCP);
this.flow = new NetworkFlow(fiveTuple, tcpPacket.ParentFrame.Timestamp, tcpPacket.ParentFrame.Timestamp, 0, 0);
this.SetEstablished(tcpPacket.SequenceNumber, tcpPacket.AcknowledgmentNumber);
}
this.protocolFinder = protocolFinderFactory.CreateProtocolFinder(this.flow, this.startFrameNumber);
}
public override IEnumerable <AbstractPacket> GetSubPackets(bool includeSelfReference)
{
if (includeSelfReference)
{
yield return(this);
}
if (this.fragmentOffset != 0 || this.moreFragmentsFlag)
{
if (!this.ParentFrame.QuickParse)
{
byte[] reassembledIpFrameData = null;
string fragmentID = this.GetFragmentIdentifier();
lock (PacketHandler.Ipv4Fragments) {
List <IPv4Packet> ipPacketList;
if (!PacketHandler.Ipv4Fragments.ContainsKey(fragmentID))
{
ipPacketList = new List <IPv4Packet>();
PacketHandler.Ipv4Fragments.Add(fragmentID, ipPacketList);
}
else
{
ipPacketList = PacketHandler.Ipv4Fragments[fragmentID];
}
ipPacketList.Add(this);
//see if we have all fragments of a complete IP packet
bool allFragmentsHaveMoreFragmentsFlag = true;
int completeIpPacketPayloadLength = 0;
foreach (IPv4Packet p in ipPacketList)
{
completeIpPacketPayloadLength += p.PayloadLength;
if (!p.moreFragmentsFlag)
{
allFragmentsHaveMoreFragmentsFlag = false;
}
}
if (!allFragmentsHaveMoreFragmentsFlag)
{
//we might actually have all the fragments!
reassembledIpFrameData = new byte[this.HeaderLength + completeIpPacketPayloadLength];
if (reassembledIpFrameData.Length > UInt16.MaxValue)
{
PacketHandler.Ipv4Fragments.Remove(fragmentID);
yield break;
}
foreach (IPv4Packet p in ipPacketList)
{
if (p.fragmentOffset + this.HeaderLength + p.PayloadLength > reassembledIpFrameData.Length)
{
yield break;
}
Array.Copy(p.ParentFrame.Data, p.PacketStartIndex + p.HeaderLength, reassembledIpFrameData, p.fragmentOffset + this.HeaderLength, p.PayloadLength);
}
PacketHandler.Ipv4Fragments.Remove(fragmentID);//we don't want to reassemble this IP frame any more
//we now need to create a fake frame and run GetSubPackets(false) on it
}
}//Release lock on PacketHandler.Ipv4Fragments
if (reassembledIpFrameData != null && reassembledIpFrameData.Length > this.HeaderLength)
{
Array.Copy(this.ParentFrame.Data, this.PacketStartIndex, reassembledIpFrameData, 0, this.headerLength);
//totalLength = (ushort)reassembledIpFrameData.Length;
Utils.ByteConverter.ToByteArray((ushort)reassembledIpFrameData.Length, reassembledIpFrameData, 2);
//moreFragmentsFlag = false;
//fragmentOffset = 0;
reassembledIpFrameData[6] = 0;
reassembledIpFrameData[7] = 0;
Frame reassembledFrame = new Frame(this.ParentFrame.Timestamp, reassembledIpFrameData, ParentFrame.FrameNumber);
IPv4Packet reassembledIpPacket = new IPv4Packet(reassembledFrame, 0, reassembledFrame.Data.Length - 1);
reassembledIpPacket.fragmentOffset = 0;
reassembledIpPacket.moreFragmentsFlag = false;
reassembledIpPacket.totalLength = (ushort)reassembledIpFrameData.Length;
foreach (AbstractPacket subPacket in reassembledIpPacket.GetSubPackets(false))
{
yield return(subPacket);
}
}
}
}
else if (PacketStartIndex + headerLength < PacketEndIndex && this.fragmentOffset == 0)
{
AbstractPacket packet;
try {
if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.TCP)
{
//TCP packet
if (PacketStartIndex + headerLength + 20 > PacketEndIndex + 1)
{
yield break;//too little room for a TCP packet
}
else
{
packet = new TcpPacket(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
}
else if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.UDP)
{
//UDP packet
if (PacketStartIndex + headerLength + 8 > PacketEndIndex + 1)
{
yield break;//too little room for a UDP packet
}
else
{
packet = new UdpPacket(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
}
else if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.SCTP)
{
//SCTP packet
packet = new SctpPacket(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
else if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.IPv6)
{
packet = new IPv6Packet(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
else if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.GRE)
{
packet = new GrePacket(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
else if (this.protocol == (byte)IPv4Packet.RFC1700Protocols.ICMP)
{
packet = new IcmpPacket(this.ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
else
{
packet = new RawPacket(ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
}
catch (Exception) {
packet = new RawPacket(ParentFrame, PacketStartIndex + headerLength, PacketEndIndex);
}
yield return(packet);
foreach (AbstractPacket subPacket in packet.GetSubPackets(false))
{
yield return(subPacket);
}
}
}
public override IEnumerable <AbstractPacket> GetSubPackets(bool includeSelfReference)
{
if (includeSelfReference)
{
yield return(this);
}
if (PacketStartIndex + 40 < PacketEndIndex)
{
AbstractPacket packet;
try {
if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.TCP)
{
//TCP packet
if (PacketStartIndex + 40 + 20 > PacketEndIndex + 1)
{
yield break;//too little room for a TCP packet
}
else
{
packet = new TcpPacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);//bugg?
}
}
else if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.UDP)
{
//UDP packet
if (PacketStartIndex + 40 + 8 > PacketEndIndex + 1)
{
yield break;//too little room for a UDP packet
}
else
{
packet = new UdpPacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
}
else if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.SCTP)
{
//SCTP packet
packet = new SctpPacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
else if (this.nextHeader == (byte)IPv4Packet.RFC1700Protocols.GRE)
{
//GRE packet
packet = new GrePacket(this.ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
else
{
packet = new RawPacket(ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
}
catch (Exception e) {
SharedUtils.Logger.Log("Error parsing packet in IPv6 payload in " + this.ParentFrame.ToString() + ". " + e.ToString(), SharedUtils.Logger.EventLogEntryType.Warning);
packet = new RawPacket(ParentFrame, PacketStartIndex + 40, PacketEndIndex);
}
yield return(packet);
foreach (AbstractPacket subPacket in packet.GetSubPackets(false))
{
yield return(subPacket);
}
}
}
private TpktPacket(Frame parentFrame, int packetStartIndex, int packetEndIndex, TcpPacket parentTcpPacket)
: base(parentFrame, packetStartIndex, packetEndIndex, "TPKT")
{
this.version = parentFrame.Data[packetStartIndex];
this.length = Utils.ByteConverter.ToUInt16(parentFrame.Data, packetStartIndex + 2, false);
this.parentTcpPacket = parentTcpPacket;
}
public static bool TryParse(Frame parentFrame, int packetStartIndex, int packetEndIndex, TcpPacket parentTcpPacket, out AbstractPacket result)
{
result = null;
if (parentFrame.Data[packetStartIndex] != 3)//"This field is always 3 for the version of the protocol described in this memo."
{
return(false);
}
if (parentFrame.Data[packetStartIndex + 1] != 0)//the "reserved" value should be 0
{
return(false);
}
ushort length = Utils.ByteConverter.ToUInt16(parentFrame.Data, packetStartIndex + 2, false);
if (length > packetEndIndex - packetStartIndex + 1 || length < 4)
{
return(false);
}
try {
result = new TpktPacket(parentFrame, packetStartIndex, packetEndIndex, parentTcpPacket);
}
catch {
result = null;
}
if (result == null)
{
return(false);
}
else
{
return(true);
}
}