private static void Kernel_UdpIpSend(UdpIpTraceData packet)
{
if (packet.size == 56)
{
uint ipv4 = BitConverter.ToUInt32(packet.daddr.MapToIPv4().GetAddressBytes(), 0);
ulong netId = (ulong)packet.dport << 32 | ipv4;
lock (lockObj)
{
if (pings.ContainsKey(netId))
{
if (pings[netId].tFirstSend == -1)
{
pings[netId].tFirstSend = packet.TimeStampRelativeMSec;
}
pings[netId].stunSentCnt++;
// For the first 10 seconds of connection, some STUN packets may be dropped entirely, which messes with the ping
// filter. Assuming late packets were dropped at the beginning helps.
if (pings[netId].tStunSent == -1 || packet.TimeStampRelativeMSec - pings[netId].tFirstSend < 10000)
{
pings[netId].tStunSent = packet.TimeStampRelativeMSec;
}
else
{
pings[netId].stunLateCnt++;
}
}
}
}
}
public void LogEvent(UdpIpTraceData data)
{
LogRow text = new LogRow();
_netWriter.WriteHeader(data, text);
text.Add(data.saddr.ToString());
text.Add(data.sport.ToString());
text.Add(data.daddr.ToString());
text.Add(data.dport.ToString());
_netWriter.WriteRow(text);
}
private static void Kernel_UdpIpRecv(UdpIpTraceData packet)
{
if (pings.ContainsKey(packet.saddr) && packet.size == 68)
{
if (pings[packet.saddr].tPacketSent != -1)
{
pings[packet.saddr].tLastRecv = packet.TimeStampRelativeMSec;
pings[packet.saddr].ping = packet.TimeStampRelativeMSec - pings[packet.saddr].tPacketSent;
pings[packet.saddr].tPacketSent = -1;
}
}
}
private static void Kernel_UdpIpRecv(UdpIpTraceData packet)
{
if (packet.size == 68)
{
uint ipv4 = BitConverter.ToUInt32(packet.saddr.MapToIPv4().GetAddressBytes(), 0);
ulong netId = (ulong)packet.sport << 32 | ipv4;
lock (lockObj)
{
if (pings.ContainsKey(netId))
{
if (pings[netId].tStunSent != -1)
{
PingInfo pi = pings[netId];
pi.tLastStunRecv = packet.TimeStampRelativeMSec;
pi.ping = packet.TimeStampRelativeMSec - pi.tStunSent;
pi.pingSamples[pi.cnt++ % N_SAMPLES] = pi.ping;
if (pi.cnt >= N_SAMPLES)
{ // After N_SAMPLES measurements, compute average ping and jitter
pi.avgPing = 0;
for (int i = 0; i < N_SAMPLES; i++)
{
pi.avgPing += pi.pingSamples[i];
}
pi.avgPing /= N_SAMPLES;
pi.jitter = 0;
for (int i = 0; i < N_SAMPLES; i++)
{
pi.jitter += Math.Pow(pi.pingSamples[i] - pi.avgPing, 2);
}
pi.jitter = Math.Sqrt(pi.jitter / N_SAMPLES);
}
pings[netId].tStunSent = -1;
}
}
}
}
}
private static void Kernel_UdpIpSend(UdpIpTraceData packet)
{
if (packet.size == 56)
{
if (!pings.ContainsKey(packet.daddr))
{
pings[packet.daddr] = new PingInfo(packet.TimeStampRelativeMSec);
}
pings[packet.daddr].tPacketSent = packet.TimeStampRelativeMSec;
foreach (IPAddress ip in pings.Keys)
{
if (pings[ip].tLastRecv - packet.TimeStampRelativeMSec > 10000)
{
pings.Remove(ip);
}
}
}
}
