private IcmpResult Ping(IcmpAction action, IcmpService icmpService)
{
try
{
var icmpResult = icmpService.Ping(action.Timeout, action.MaxTTL, action.WeightPacket);
if (icmpResult.Duration.Equals(TimeSpan.MaxValue))
{
icmpResult.ErrorMessage = "Connection timed out";
icmpResult.Success = false;
}
// Adding some sleep to prevent icmp attacks on the host.
if (1000 - icmpResult.Duration.TotalMilliseconds > 0)
{
Thread.Sleep(action.UpdatePeriod - (int)icmpResult.Duration.TotalMilliseconds);
}
icmpResult.Host = action.Host;
return(icmpResult);
}
catch (Exception e)
{
return(new IcmpResult
{
Host = action.Host,
Weight = action.WeightPacket,
Success = false,
ErrorMessage = e.Message,
});
}
}
public IEnumerable <IcmpResult> Handle(IcmpAction icmpAction)
{
var icmpService = new IcmpService(icmpAction.Host);
bool isTargetFound = false;
bool isTimeout = false;
int startTTL = 1;
int hopNumber = 1;
int nbrErr = 0;
while (!isTargetFound & !isTimeout)
{
IcmpResult icmpResult = new IcmpResult();
try
{
startTTL += 1; // With each attempt allow a higher TTL.
icmpResult = icmpService.Ping(icmpAction.Timeout, startTTL);
icmpResult.HopNumber = hopNumber;
nbrErr = 0; // New hop was reached, reset error count to 0;
try
{
icmpResult.Host = Dns.GetHostEntry(icmpResult.IPEndPoint).HostName.ToString();
}
catch { }
if (icmpResult.Duration.Equals(TimeSpan.MaxValue))
{
icmpResult.Success = false;
icmpResult.ErrorMessage = "Timed out";
}
else
{
hopNumber++;
}
if (icmpResult.IPEndPoint.Equals(icmpService.TargetIp.ToString()))
{
isTargetFound = true;
}
if (startTTL >= icmpAction.MaxTTL)
{
isTimeout = true;
}
hopNumber++;
}
catch
{
nbrErr++;
if (nbrErr > 10)
{
isTimeout = true;
}
}
yield return(icmpResult);
}
}
public IEnumerable <IcmpResult> Handle(IcmpAction action)
{
var icmpService = new IcmpService(action.Host);
// Keep pinging until the amount of wanted echos is exchausted.
while (action.NbrEcho > 0)
{
yield return(Ping(action, icmpService));
action.NbrEcho--;
}
}
private IEnumerable <IcmpResult> HandleIcmpAction(string host, IcmpType icmpType, int nbrEcho, int weightPacket, int updatePeriod, int timeout, int maxTTL)
{
IcmpAction icmpAction = new IcmpAction(host, icmpType, nbrEcho, weightPacket, updatePeriod, timeout, maxTTL);
return(GetIcmpActionHandler(icmpType).Handle(icmpAction));
}
