private AbstractPacket GetProtocolPacket(ApplicationLayerProtocol protocol, bool clientToServer)
{
AbstractPacket packet = null;
if (protocol == ApplicationLayerProtocol.Dns)
{
if (DnsPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, true, out DnsPacket dnsPacket))
{
return(dnsPacket);
}
}
else if (protocol == ApplicationLayerProtocol.FtpControl)
{
if (FtpPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Http)
{
if (HttpPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Http2)
{
if (Http2Packet.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Irc)
{
if (IrcPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.IEC_104)
{
if (IEC_60870_5_104Packet.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Imap)
{
return(new ImapPacket(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer));
}
else if (protocol == ApplicationLayerProtocol.Kerberos)
{
return(new KerberosPacket(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, true));
}
else if (protocol == ApplicationLayerProtocol.Lpd)
{
if (LpdPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.ModbusTCP)
{
if (ModbusTcpPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, this.sourcePort, this.destinationPort, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.NetBiosNameService)
{
return(new NetBiosNameServicePacket(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex));
}
else if (protocol == ApplicationLayerProtocol.NetBiosSessionService)
{
if (NetBiosSessionService.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, this.sourcePort, this.destinationPort, out packet, this.IsVirtualPacketFromTrailingDataInTcpSegment))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.OpenFlow)
{
if (OpenFlowPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Oscar)
{
if (OscarPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.OscarFileTransfer)
{
if (OscarFileTransferPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Pop3)
{
return(new Pop3Packet(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer));
}
else if (protocol == ApplicationLayerProtocol.Sip)
{
return(new SipPacket(this.ParentFrame, this.PacketStartIndex + this.DataOffsetByteCount, this.PacketEndIndex));
}
else if (protocol == ApplicationLayerProtocol.Smtp)
{
return(new SmtpPacket(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer));
}
else if (protocol == ApplicationLayerProtocol.Socks)
{
if (SocksPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.SpotifyServerProtocol)
{
if (SpotifyKeyExchangePacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, clientToServer, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Ssh)
{
if (SshPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.Ssl)
{
if (SslPacket.TryParse(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, out packet))
{
return(packet);
}
}
else if (protocol == ApplicationLayerProtocol.TabularDataStream)
{
return(new TabularDataStreamPacket(this.ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex));
}
else if (protocol == ApplicationLayerProtocol.Tpkt)
{
if (TpktPacket.TryParse(ParentFrame, this.PacketStartIndex + this.dataOffsetByteCount, this.PacketEndIndex, this, out packet))
{
return(packet);
}
}
return(packet);
}
public static bool TryParse(Frame parentFrame, int packetStartIndex, int packetEndIndex, bool clientToServer, out AbstractPacket result)
{
result = null;
if (!clientToServer && packetEndIndex - packetStartIndex == 1 && parentFrame.Data[packetStartIndex] == 1 && parentFrame.Data[packetStartIndex + 1] == 0)
{
result = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);//RFC1929 Initial negotiation response
return(true);
}
if (parentFrame.Data.Length < packetStartIndex + 2)
{
return(false);
}
if (clientToServer && isLikelyInitialUsernamePasswordNegotiation(parentFrame, packetStartIndex, packetEndIndex))
{
try {
SocksPacket socksPacket = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);
if (socksPacket.PacketHeaderIsComplete)
{
result = socksPacket;
return(true);
}
else
{
return(false);
}
}
catch { return(false); }
}
if (parentFrame.Data[packetStartIndex] < 4 || parentFrame.Data[packetStartIndex] > 5)
{
return(false);
}
if (clientToServer)
{
byte nMethodsOrCmd = parentFrame.Data[packetStartIndex + 1];
if (packetEndIndex - packetStartIndex == nMethodsOrCmd + 1)
{
//version identifier/method selection message
try {
SocksPacket socksPacket = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);
if (socksPacket.PacketHeaderIsComplete)
{
result = socksPacket;
return(true);
}
else
{
return(false);
}
}
catch { return(false); }
}
else if (parentFrame.Data.Length > packetStartIndex + 6)
{
if (isLikelySocksRequestOrReply(parentFrame, packetStartIndex, packetEndIndex))
{
try {
SocksPacket socksPacket = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);
if (socksPacket.PacketHeaderIsComplete)
{
result = socksPacket;
return(true);
}
else
{
return(false);
}
}
catch { return(false); }
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
//server to client
if (packetEndIndex - packetStartIndex == 1)
{
//METHOD selection message
try {
SocksPacket socksPacket = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);
if (socksPacket.PacketHeaderIsComplete)
{
result = socksPacket;
return(true);
}
else
{
return(false);
}
}
catch { return(false); }
}
else if (packetEndIndex - packetStartIndex > 6)
{
if (isLikelySocksRequestOrReply(parentFrame, packetStartIndex, packetEndIndex))
{
try {
SocksPacket socksPacket = new SocksPacket(parentFrame, packetStartIndex, packetEndIndex, clientToServer);
if (socksPacket.PacketHeaderIsComplete)
{
result = socksPacket;
return(true);
}
else
{
return(false);
}
}
catch { return(false); }
}
else
{
return(false);
}
}
else
{
return(false);
}
}
}