private static unsafe TcpStateStatistics GetStatistics(byte[] data, AddressFamily addressFamily,
TcpStateStatistics stats, int?pidFilter, int?portFilter)
{
fixed(byte *b = data)
{
var count = *(int *)b;
if (addressFamily == AddressFamily.AF_INET)
{
var ptr = (MIB_TCPROW_OWNER_PID *)(b + 4);
for (var i = 0; i < count; i++)
{
AddToStats(ref stats, ptr[i].dwState, ptr[i].dwOwningPid, ptr[i].dwLocalPort, pidFilter, portFilter);
}
return(stats);
}
if (addressFamily == AddressFamily.AF_INET6)
{
var ptr = (MIB_TCP6ROW_OWNER_PID *)(b + 4);
for (var i = 0; i < count; i++)
{
AddToStats(ref stats, ptr[i].dwState, ptr[i].dwOwningPid, ptr[i].dwLocalPort, pidFilter, portFilter);
}
}
return(stats);
}
}
private static void Add(TcpStateStatistics stats, MIB_TCP_STATE state)
{
switch (state)
{
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSED:
stats.Closed++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_LISTEN:
stats.Listen++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_SYN_SENT:
stats.SynSent++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_SYN_RCVD:
stats.SynRcvd++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_ESTAB:
stats.Established++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_FIN_WAIT1:
stats.FinWait1++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_FIN_WAIT2:
stats.FinWait2++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSE_WAIT:
stats.CloseWait++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_CLOSING:
stats.Closing++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_LAST_ACK:
stats.LastAck++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_TIME_WAIT:
stats.TimeWait++;
break;
case MIB_TCP_STATE.MIB_TCP_STATE_DELETE_TCB:
stats.DeleteTcb++;
break;
default:
stats.Unknown++;
break;
}
}
public static void GetTcpStats(AddressFamily addressFamily, TcpStateStatistics stats, int?pidFilter = null, int?portFilter = null)
{
ThrowOnUnknownAddressFamily(addressFamily);
var pool = addressFamily == AddressFamily.AF_INET ? ArrayBufferPoolV4 : ArrayBufferPoolV6;
using (var arrayBuffer = pool.AcquireHandle())
{
GetTcpTableWithPid(addressFamily, arrayBuffer);
GetStatistics(arrayBuffer.Resource.Buffer, addressFamily, stats, pidFilter, portFilter);
}
}
private static void AddToStats(ref TcpStateStatistics stats, MIB_TCP_STATE tcpState, int pid, int rawPort, int?pidFilter, int?portFilter)
{
if (pidFilter.HasValue && pid != pidFilter)
{
return;
}
var port = GetPort(rawPort);
if (portFilter.HasValue && port != portFilter)
{
return;
}
Add(stats, tcpState);
}
private static unsafe void GetStatisticsForAllProcesses(byte[] data, AddressFamily addressFamily, Dictionary <int, TcpStateStatistics> stats)
{
fixed(byte *b = data)
{
var count = *(int *)b;
if (addressFamily == AddressFamily.AF_INET)
{
var ptr = (MIB_TCPROW_OWNER_PID *)(b + 4);
for (var i = 0; i < count; i++)
{
var pid = ptr[i].dwOwningPid;
if (!stats.TryGetValue(pid, out var stat))
{
stats[pid] = stat = new TcpStateStatistics();
}
Add(stat, ptr[i].dwState);
}
}
if (addressFamily == AddressFamily.AF_INET6)
{
var ptr = (MIB_TCP6ROW_OWNER_PID *)(b + 4);
for (var i = 0; i < count; i++)
{
var pid = ptr[i].dwOwningPid;
if (!stats.TryGetValue(pid, out var stat))
{
stats[pid] = stat = new TcpStateStatistics();
}
Add(stat, ptr[i].dwState);
}
}
}
}