public PacketCaptureHandler(PacketCapture parent, FilterIp[] filters, PacketCaptureCallback success, PacketErrorCallback error)
{
this.parent = parent;
this.filters = filters;
this.success = success;
this.error = error;
this.parent.AddHandler(this);
}
/// <summary>
/// Parses an IP packet from the specified buffer at the given index, filtering according to the specified filters.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="index">The index.</param>
/// <param name="length">The length.</param>
/// <param name="filters">The list of filters.</param>
/// <param name="packet">The IP packet or <b>null</b>.</param>
/// <returns><b>True</b> if th packet was parsed, <b>false</b> otherwise.</returns>
public static bool ParseFilter(byte[] buffer, ref int index, int length, FilterIp[] filters, out ProtoPacketIp packet)
{
// Set the packet to null.
packet = null;
// Validate the packet.
if (buffer[index] >> 4 != ProtoPacketIp.version) return false;
// Validate the length.
if ((ushort)((buffer[index + 2] << 8) | buffer[index + 3]) != length - index) return false;
// Set the protocol.
byte protocol = buffer[index + 9];
// Parse the source address.
IPAddress sourceAddress = new IPAddress(new byte[] { buffer[index + 12], buffer[index + 13], buffer[index + 14], buffer[index + 15] });
// Parse the destination address.
IPAddress destinationAddress = new IPAddress(new byte[] { buffer[index + 16], buffer[index + 17], buffer[index + 18], buffer[index + 19] });
// Try and match the filters.
bool match = false;
for (int idx = 0; (idx < filters.Length) && (!match); idx++)
{
match = match || filters[idx].Matches(sourceAddress, destinationAddress, protocol);
}
if (!match)
return false;
// Parse the packet.
packet = ProtoPacketIp.Parse(buffer, ref index, length);
// Return true.
return true;
}
