static unsafe int Main(string[] args)
{
uint status;
// Print the table of connections
// Call for the size
uint size = 0;
status = IphlpApi.GetTcpTable2(IntPtr.Zero, ref size, order: true);
fixed(byte *buffer = new byte[size])
{
var bufferIntPtr = (IntPtr)buffer;
status = IphlpApi.GetTcpTable2(bufferIntPtr, ref size, order: true);
switch (status)
{
case StatusCode.NoError:
var numConnections = *(uint *)bufferIntPtr;
Console.WriteLine($"Found {numConnections} connections:");
bufferIntPtr += sizeof(uint);
for (int i = 0; i < numConnections; i++)
{
var row = Marshal.PtrToStructure <TcpRow2>(bufferIntPtr);
Console.WriteLine(FormatTcpConnectionInfo(row.localAddr, row.localPort, row.remoteAddr, row.remotePort, row.state.ToString()));
bufferIntPtr += sizeof(TcpRow2);
}
break;
case StatusCode.ErrorInsufficientBuffer:
Console.Error.WriteLine($"Insufficient buffer: required {size} bytes.");
break;
case StatusCode.ErrorInvalidParameter:
Console.Error.WriteLine("Could not write to the buffer. Is it null?");
break;
case StatusCode.ErrorNotSupported:
Console.Error.WriteLine("Not supported on this OS.");
break;
default:
Console.Error.WriteLine("An unknown error occurred.");
break;
}
}
if (status != StatusCode.NoError)
{
return(1);
}
// Print the table of bound ports
var boundPortTable = new HeapAllocHandle();
status = IphlpApi.InternalGetBoundTcpEndpointTable(ref boundPortTable, HeapAllocHandle.DangerousGetProcessHeap(), flags: 0);
if (status == StatusCode.NoError)
{
var numConnections = *(uint *)boundPortTable.DangerousGetHandle();
Console.WriteLine($"Found {numConnections} bound ports:");
// We need to keep a pointer to the start of the memory block so we can free it at the end
var currentRow = boundPortTable.DangerousGetHandle();
currentRow += sizeof(uint);
for (int i = 0; i < numConnections; i++)
{
var row = Marshal.PtrToStructure <TcpRow2>(currentRow);
Console.WriteLine(FormatTcpConnectionInfo(row.localAddr, row.localPort, row.remoteAddr, row.remotePort, "BOUND"));
currentRow += sizeof(TcpRow2);
}
}
else
{
Console.Error.WriteLine("An unknown error occurred.");
}
if (status != StatusCode.NoError)
{
return(1);
}
return(0);
}
public static extern uint InternalGetBoundTcpEndpointTable(ref HeapAllocHandle tcpTable, IntPtr heapHandle, uint flags);