public static IPForwardTable GetRoutingTable()
{
IntPtr fwdTable = IntPtr.Zero;
int size = 0;
PInvoke.GetIpForwardTable(fwdTable, ref size, true);
fwdTable = Marshal.AllocHGlobal(size);
PInvoke.GetIpForwardTable(fwdTable, ref size, true);
IPForwardTable forwardTable = PInvoke.ReadIPForwardTable(fwdTable);
Marshal.FreeHGlobal(fwdTable);
return(forwardTable);
}
public static IPForwardTable ReadIPForwardTable(IntPtr tablePtr)
{
IPForwardTable result = (IPForwardTable)Marshal.PtrToStructure(tablePtr, typeof(IPForwardTable));
MibIPForwardRow[] table = new MibIPForwardRow[result.Size];
IntPtr p = new IntPtr(tablePtr.ToInt64() + Marshal.SizeOf(result.Size));
for (int i = 0; i < result.Size; ++i)
{
table[i] = (MibIPForwardRow)Marshal.PtrToStructure(p, typeof(MibIPForwardRow));
p = new IntPtr(p.ToInt64() + Marshal.SizeOf(typeof(MibIPForwardRow)));
}
result.Table = table;
return(result);
}
private static void DeleteRouteInternal(Func <MibIPForwardRow, int, bool> func)
{
IPForwardTable routingTable = GetRoutingTable();
List <MibIPForwardRow> filtered = routingTable.Table.Where(func).ToList();
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MibIPForwardRow)));
try
{
foreach (MibIPForwardRow routeEntry in filtered)
{
Marshal.StructureToPtr(routeEntry, ptr, false);
PInvoke.DeleteIpForwardEntry(ptr);
}
}
finally
{
Marshal.FreeHGlobal(ptr);
}
}