public Tcp6ConnectionInfo(Iphlpapi.MIB_TCP6ROW2 tcpRow)
{
// We mask the ports in this struct because according to the documentation, the upper
// bits can be populated arbitrarily, aka undefined state.
LocalPort = (ushort)IPAddress.NetworkToHostOrder((short)(tcpRow.dwLocalPort & 0xFFFF));
RemotePort = (ushort)IPAddress.NetworkToHostOrder((short)(tcpRow.dwRemotePort & 0xFFFF));
LocalAddress = new IPAddress(tcpRow.LocalAddr.u.Byte);
RemoteAddress = new IPAddress(tcpRow.RemoteAddr.u.Byte);
State = tcpRow.State;
OffloadState = tcpRow.dwOffloadState;
LocalScopeId = tcpRow.dwLocalScopeId;
OwnerPid = tcpRow.dwOwningPid; // <= 4 is System process
}
public static List <Tcp6ConnectionInfo> GetIP6(Action <string> log)
{
List <Tcp6ConnectionInfo> resultTable = new List <Tcp6ConnectionInfo>();
try
{
// Get size first
int tableSize = 0;
int errorCode = Iphlpapi.GetTcp6Table2(IntPtr.Zero, ref tableSize, false);
if (errorCode != 122) // 122 return when we pass small buffer but output the expected buffer
{
throw new Exception("Can't read table size, error code: " + errorCode);
}
IntPtr memoryPointer = IntPtr.Zero; // Where we allocate
try
{
// Get Table data:
memoryPointer = Marshal.AllocHGlobal(tableSize);
errorCode = Iphlpapi.GetTcp6Table2(memoryPointer, ref tableSize, false);
if (errorCode != 0)
{
throw new Exception("Can't read table data, error code: " + errorCode);
}
var tableInfoStruct =
(Iphlpapi.MIB_TCP6TABLE2)Marshal.PtrToStructure(memoryPointer, typeof(Iphlpapi.MIB_TCP6TABLE2));
// The other rows are sequentially after the size:
IntPtr tableRowsPointer =
(IntPtr)((long)memoryPointer + Marshal.SizeOf(tableInfoStruct.dwNumEntries));
for (int i = 0; i < tableInfoStruct.dwNumEntries; i++)
{
Iphlpapi.MIB_TCP6ROW2 tcpRow = (Iphlpapi.MIB_TCP6ROW2)
Marshal.PtrToStructure(tableRowsPointer, typeof(Iphlpapi.MIB_TCP6ROW2));
resultTable.Add(new Tcp6ConnectionInfo(tcpRow));
// Advance in memory the size of the row:
tableRowsPointer = (IntPtr)((long)tableRowsPointer + Marshal.SizeOf(tcpRow));
}
}
catch (OutOfMemoryException exMem)
{
log("Can't allocated data, error:\n" + exMem);
}
catch (Exception exReadData)
{
log("Error occured while getting data, error:\n" + exReadData);
}
finally
{
Marshal.FreeHGlobal(memoryPointer);
memoryPointer = IntPtr.Zero;
}
}
catch (Exception exMain)
{
log("Error occured, error:\n" + exMain);
}
return(resultTable);
}
