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) {
packet = new RawPacket(ParentFrame, PacketStartIndex + 40, 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 (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);
}
}
}
