/// <summary> Convert captured packet data into an object. /// </summary> public static Packet dataToPacket(int linkType, byte[] bytes, Timeval tv) { int ethProtocol; // record the length of the headers associated with this link layer type. // this length is the offset to the header embedded in the packet. lLen = LinkLayer.getLinkLayerLength(linkType); // extract the protocol code for the type of header embedded in the // link-layer of the packet int offset = LinkLayer.getProtoOffset(linkType); if (offset == -1) { // if there is no embedded protocol, assume IP? ethProtocol = Packets.EthernetProtocols_Fields.IP; } else { ethProtocol = ArrayHelper.extractInteger(bytes, offset, Packets.EthernetFields.ETH_CODE_LEN); } // try to recognize the ethernet type.. switch (ethProtocol) { // arp case Packets.EthernetProtocols_Fields.ARP: return(new ARPPacket(lLen, bytes, tv)); case Packets.EthernetProtocols_Fields.IP: int ipProtocol = IPProtocol.extractProtocol(lLen, bytes); switch (ipProtocol) { // icmp case Packets.IPProtocols_Fields.ICMP: return(new ICMPPacket(lLen, bytes, tv)); // igmp case Packets.IPProtocols_Fields.IGMP: return(new IGMPPacket(lLen, bytes, tv)); // tcp case Packets.IPProtocols_Fields.TCP: return(new TCPPacket(lLen, bytes, tv)); // udp case Packets.IPProtocols_Fields.UDP: return(new UDPPacket(lLen, bytes, tv)); // unidentified ip.. default: return(new IPPacket(lLen, bytes, tv)); } // ethernet level code not recognized, default to anonymous packet.. //goto default; default: return(new EthernetPacket(lLen, bytes, tv)); } }
public virtual void setUp() { // get link layer length int linkLayerLen = LinkLayer.getLinkLayerLength(Packets.LinkLayers.EN10MB); // create syn-ack packet _synAck = new IPPacket(linkLayerLen, SYN_ACK_PACKET); // create psh-ack packet _pshAck = new IPPacket(linkLayerLen, PSH_ACK_PACKET); // create packet with random garbage byte[] badBytes = new byte[SYN_ACK_PACKET.Length]; (new System.Random()).NextBytes((badBytes)); _baddie = new IPPacket(linkLayerLen, badBytes); }
public static void MyTest1() { byte[] SYN_ACK_PACKET = new byte[] { (byte)(0x00), (byte)(0x10), (byte)(0x7b), (byte)(0x38), (byte)(0x46), (byte)(0x33), (byte)(0x08), (byte)(0x00), (byte)(0x20), (byte)(0x89), (byte)(0xa5), (byte)(0x9f), (byte)(0x08), (byte)(0x00), (byte)(0x45), (byte)(0x00), (byte)(0x00), (byte)(0x2c), (byte)(0x93), (byte)(0x83), (byte)(0x40), (byte)(0x00), (byte)(0xff), (byte)(0x06), (byte)(0x6c), (byte)(0x38), (byte)(0xac), (byte)(0x10), (byte)(0x70), (byte)(0x32), (byte)(0x87), (byte)(0x0d), (byte)(0xd8), (byte)(0xbf), (byte)(0x00), (byte)(0x19), (byte)(0x50), (byte)(0x49), (byte)(0x78), (byte)(0xbe), (byte)(0xe0), (byte)(0xa7), (byte)(0x9f), (byte)(0x3a), (byte)(0xb4), (byte)(0x03), (byte)(0x60), (byte)(0x12), (byte)(0x22), (byte)(0x38), (byte)(0xfc), (byte)(0xc7), (byte)(0x00), (byte)(0x00), (byte)(0x02), (byte)(0x04), (byte)(0x05), (byte)(0xb4), (byte)(0x70), (byte)(0x6c) }; byte[] PSH_ACK_PACKET = new byte[] { (byte)(0x08), (byte)(0x00), (byte)(0x20), (byte)(0x89), (byte)(0xa5), (byte)(0x9f), (byte)(0x00), (byte)(0x10), (byte)(0x7b), (byte)(0x38), (byte)(0x46), (byte)(0x33), (byte)(0x08), (byte)(0x00), (byte)(0x45), (byte)(0x00), (byte)(0x00), (byte)(0x3e), (byte)(0x87), (byte)(0x08), (byte)(0x40), (byte)(0x00), (byte)(0x3f), (byte)(0x06), (byte)(0x38), (byte)(0xa2), (byte)(0x87), (byte)(0x0d), (byte)(0xd8), (byte)(0xbf), (byte)(0xac), (byte)(0x10), (byte)(0x70), (byte)(0x32), (byte)(0x50), (byte)(0x49), (byte)(0x00), (byte)(0x19), (byte)(0x9f), (byte)(0x3a), (byte)(0xb4), (byte)(0x03), (byte)(0x78), (byte)(0xbe), (byte)(0xe0), (byte)(0xf8), (byte)(0x50), (byte)(0x18), (byte)(0x7d), (byte)(0x78), (byte)(0x86), (byte)(0xf0), (byte)(0x00), (byte)(0x00), (byte)(0x45), (byte)(0x48), (byte)(0x4c), (byte)(0x4f), (byte)(0x20), (byte)(0x61), (byte)(0x6c), (byte)(0x70), (byte)(0x68), (byte)(0x61), (byte)(0x2e), (byte)(0x61), (byte)(0x70), (byte)(0x70), (byte)(0x6c), (byte)(0x65), (byte)(0x2e), (byte)(0x65), (byte)(0x64), (byte)(0x75), (byte)(0x0d), (byte)(0x0a) }; // get link layer length int linkLayerLen = LinkLayer.getLinkLayerLength(Packets.LinkLayers.EN10MB); // create syn-ack packet IPPacket _synAck = new IPPacket(linkLayerLen, SYN_ACK_PACKET); // create psh-ack packet IPPacket _pshAck = new IPPacket(linkLayerLen, PSH_ACK_PACKET); // create packet with random garbage byte[] badBytes = new byte[SYN_ACK_PACKET.Length]; (new System.Random()).NextBytes((badBytes)); IPPacket _baddie = new IPPacket(linkLayerLen, badBytes); IPPacket.TestProbe probe = new Packets.IPPacket.TestProbe(_synAck); Console.WriteLine("Computed IP checksum mismatch, should be " + System.Convert.ToString(_synAck.IPChecksum, 16) + ", but is " + System.Convert.ToString(probe.ComputedSenderIPChecksum, 16) + ", (" + System.Convert.ToString(probe.ComputedReceiverIPChecksum, 16) + ") ---- {0}", _synAck.ValidChecksum); Console.WriteLine("From: {0}, To:{1}", _synAck.SourceAddress, _synAck.DestinationAddress); }