/// <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);
}
