public void Dump(bool expectationTable, Action <byte[]> cb, ConntrackQueryFilter[] qf = null, AddressFamily addressFamily = AddressFamily.Unspecified)
{
lock (_queryLock)
{
ConntrackHelper.conditional_init((int)addressFamily, qf, qf == null ? 0 : qf.Length);
try
{
byte[] buffer = new byte[1];
ConntrackHelper.CrImg img = new ConntrackHelper.CrImg();
Debug.Assert(img.CrNode == IntPtr.Zero);
ConntrackHelper.dump_nf_cts(expectationTable, ref img);
try
{
IntPtr ptr = img.CrNode;
while (ptr != IntPtr.Zero)
{
int crsize = ConntrackHelper.cr_length(ptr);
IntPtr newPtr = Marshal.ReadIntPtr(ptr);
crsize -= IntPtr.Size;
Debug.Assert(crsize > 0);
if (buffer.Length != crsize)
{
buffer = new byte[crsize];
}
Marshal.Copy(new IntPtr((long)ptr + IntPtr.Size), buffer, 0, crsize);
cb(buffer);
ptr = newPtr;
}
}
finally
{
if (img.CrNode != IntPtr.Zero)
{
ConntrackHelper.cr_free(img);
}
}
}
finally
{
if (qf != null || addressFamily != AddressFamily.Unspecified)
{
ConntrackHelper.conditional_free();
}
}
}
}
public bool ExtractField <T>(ConntrackQueryFilter[] qf, byte[] conn, out T output) where T : struct
{
var size = Marshal.SizeOf(typeof(T));
var handle = Marshal.AllocHGlobal(size);
try
{
var ret = ConntrackHelper.cr_extract_field(qf, qf.Length, conn, handle, size);
output = (T)Marshal.PtrToStructure(handle, typeof(T));
return(ret);
}
finally
{
Marshal.FreeHGlobal(handle);
}
}
public UInt16 GetConstant(String key)
{
lock (_constants)
{
UInt16 value;
if (!_constants.TryGetValue(key, out value))
{
int v = ConntrackHelper.cr_constant(key);
if (v == -1)
{
throw new KeyNotFoundException(String.Format("Unable to lookup constant {0}", key));
}
Debug.Assert(v <= UInt16.MaxValue);
value = (UInt16)v;
_constants.Add(key, value);
}
return(value);
}
}
/// <summary>
///
/// </summary>
/// <param name="expectationsTable"></param>
/// <param name="data"></param>
/// <param name="restoreMark"></param>
/// <param name="restoreMarkMask"></param>
/// <returns>remaining unprocessed data</returns>
public int Restore(bool expectationsTable, byte[] data, UInt32 restoreMark = 0, UInt32 restoreMarkMask = 0)
{
bool useRestoreMark = restoreMark != 0 || restoreMarkMask != 0;
if (useRestoreMark)
{
ConntrackHelper.restore_mark_init(restoreMark, restoreMarkMask);
}
int errorCode = ConntrackHelper.restore_nf_cts(expectationsTable, data, data.Length);
if (errorCode < 0)
{
throw new IpTablesNetException(String.Format("An error occured while loading NFCTs with the errno: {0}", -errorCode));
}
if (useRestoreMark)
{
ConntrackHelper.restore_mark_free();
}
return(errorCode);
}
