public ICMP_PingResult Ping(String host, Int32 count = 4, Int32 timeout = 1000)
{
bool infinite = false;
ICMP_PingResult Result = new ICMP_PingResult();
// Resolve the specified IP address
IPAddress hostIP;
try
{
hostIP = Dns.Resolve(host).AddressList[0];
}
catch (Exception e)
{
throw new Exception("ICMP_Ping: Unable to resolve the specified hostname.",e);
}
Result.hostIP = hostIP;
// Start pinging
try {
Icmp icmp = new Icmp(hostIP);
TimeSpan ret;
while(infinite || count > 0)
{
try
{
ret = icmp.Ping(timeout);
if (ret.Equals(TimeSpan.MaxValue))
Result.Status = ICMP_Status.TimeOut;
else
{
Result.Status = ICMP_Status.Success;
Result.RoundtripMS.Add(ret.TotalMilliseconds);
}
if (1000 - ret.TotalMilliseconds > 0)
Thread.Sleep(1000 - (int)ret.TotalMilliseconds);
}
catch (Exception e)
{
throw new Exception("Network Error",e);
}
if (!infinite)
count--;
}
} catch {
throw new Exception("Error while pinging the specified host.");
}
return Result;
}
// this is the network monitoring script
public void Run()
{
ConsoleOutputLogger.WriteLine("Starting up the Network Monitoring...");
ICMP pinger = new ICMP();
while(running)
{
foreach(NetworkMonitoringHost Host in NetworkMonitorConfiguration.NetworkHosts)
{
// start pinging around
ICMP_PingResult result = null;
try
{
result = pinger.Ping(Host.IPAdressOrHostname,1,500);
}
catch(Exception)
{
//ConsoleOutputLogger.WriteLine("NetworkMonitor Exception: "+e.Message);
result = new ICMP_PingResult();
result.Status = ICMP_Status.TimeOut;
result.hostIP = null;
}
// we got a result...
if (result != null)
{
// it's already in the list
if (OnOfflineList.ContainsKey(Host.IPAdressOrHostname))
{
if (OnOfflineList[Host.IPAdressOrHostname] == true) // this one was online before...
{
if (result.Status == ICMP_Status.TimeOut)
{
// it's now offline...
OnOfflineList[Host.IPAdressOrHostname] = false;
NetworkMonitoringDataSet ds_result = new NetworkMonitoringDataSet();
ds_result.AverageRoundtripMS = result.AverageRoundtripMS;
ds_result.Descriptor = Host.Descriptor;
ds_result.HostnameIP = Host.IPAdressOrHostname;
ds_result.Status = result.Status;
ds_result.TimeOfMeasurement = result.TimeOfMeasurement;
iQueue.Enqueue(ds_result);
}
}
else
{
if (result.Status == ICMP_Status.Success)
{
// it's now online...
OnOfflineList[Host.IPAdressOrHostname] = true;
NetworkMonitoringDataSet ds_result = new NetworkMonitoringDataSet();
ds_result.AverageRoundtripMS = result.AverageRoundtripMS;
ds_result.Descriptor = Host.Descriptor;
ds_result.HostnameIP = Host.IPAdressOrHostname;
ds_result.Status = result.Status;
ds_result.TimeOfMeasurement = result.TimeOfMeasurement;
iQueue.Enqueue(ds_result);
}
}
}
else
{
if (result.Status == ICMP_Status.Success)
OnOfflineList.Add(Host.IPAdressOrHostname,true);
else
OnOfflineList.Add(Host.IPAdressOrHostname,false);
// enqueue
NetworkMonitoringDataSet ds_result = new NetworkMonitoringDataSet();
ds_result.AverageRoundtripMS = result.AverageRoundtripMS;
ds_result.Descriptor = Host.Descriptor;
ds_result.HostnameIP = Host.IPAdressOrHostname;
ds_result.Status = result.Status;
ds_result.TimeOfMeasurement = result.TimeOfMeasurement;
iQueue.Enqueue(ds_result);
}
}
}
Thread.Sleep (NetworkMonitorUpdateTime);
}
}