bool checkHost(ref HostParms hostParms)
{
bool bRet = false;
IPHostEntry ipHost = new IPHostEntry();
try
{
IPHostEntry entry = null;
int maxSeconds = hostParms.retry /* 10 */, counter = 0;
// see http://jianmingli.com/wp/?p=22
// Start the asynchronous request for DNS information.
// This example does not use a delegate or user-supplied object
// so the last two arguments are null.
IAsyncResult result = Dns.BeginGetHostEntry(hostParms.host /* ipAddress */, null, null);
// Poll for completion information.
while (result.IsCompleted != true && counter < maxSeconds)
{
Thread.Sleep(1000);
counter++;
}
if (result.IsCompleted) //when we got here, the result is ready
{
entry = Dns.EndGetHostEntry(result); //blocks?
}
else
{
hostParms.isValid = false; // Thread.CurrentThread.Abort();
}
//IPHostEntry entry = Dns.Resolve(hostNameOrAddress);
//IPHostEntry entry = Dns.GetHostEntry(ipAddress);
hostParms.ipAddress = entry.AddressList[0];
hostParms.isValid = true;
}
catch (ThreadAbortException e)
{
Thread.CurrentThread.Abort();// ("DNS failed within timeout", e);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(string.Format("Exception in checkHost({0}): {1}", hostParms.host, e.Message));
//throw new PingUnknownHostException("Impossible to resolve host or address.", e);
}
return(hostParms.isValid);
}
bool checkHost(ref HostParms hostParms)
{
bool bRet = false;
IPHostEntry ipHost = new IPHostEntry();
try
{
IPHostEntry entry = null;
int maxSeconds = hostParms.retry/* 10 */, counter = 0;
// see http://jianmingli.com/wp/?p=22
// Start the asynchronous request for DNS information.
// This example does not use a delegate or user-supplied object
// so the last two arguments are null.
IAsyncResult result = Dns.BeginGetHostEntry(hostParms.host/* ipAddress */, null, null);
// Poll for completion information.
while (result.IsCompleted != true && counter < maxSeconds)
{
Thread.Sleep(1000);
counter++;
}
if (result.IsCompleted) //when we got here, the result is ready
entry = Dns.EndGetHostEntry(result); //blocks?
else
hostParms.isValid = false; // Thread.CurrentThread.Abort();
//IPHostEntry entry = Dns.Resolve(hostNameOrAddress);
//IPHostEntry entry = Dns.GetHostEntry(ipAddress);
hostParms.ipAddress = entry.AddressList[0];
hostParms.isValid = true;
}
catch (ThreadAbortException e)
{
Thread.CurrentThread.Abort();// ("DNS failed within timeout", e);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(string.Format( "Exception in checkHost({0}): {1}", hostParms.host, e.Message));
//throw new PingUnknownHostException("Impossible to resolve host or address.", e);
}
return hostParms.isValid;
}
//thread to do ping
public void startPing(string sHost, PingOptions pOptions)
{
System.Diagnostics.Debug.WriteLine("+++thread started");
string ipAddress = sHost;//make a local copy
Ping myPing = new Ping();
PingOptions myPingOptions = pOptions;//make a local copy
int iTimeout = pOptions.TimeOut;
int _numberOfPings = pOptions.numOfPings;
bool doNotFragment = pOptions.DontFragment;
int bufferSize = pOptions.bufferSize;
byte[] buf = new byte[bufferSize];
//long sumRoundtripTime=0;
onReply(new PingReplyEventArgs("ping started...",PingReplyTypes.info));
replyStats _replyStats = new replyStats(ipAddress);
PingReply reply = null;
try
{
onReply(new PingReplyEventArgs(pOptions.ToString(), PingReplyTypes.info));
//check DNS first as this may block for long time
IPAddress address;
HostParms hostParms = new HostParms(ipAddress, 4);
try
{
//is IP address
address = IPAddress.Parse(ipAddress);
hostParms.isValid = true;
}
catch
{
if (checkHost(ref hostParms))
ipAddress = hostParms.ipAddress.ToString();
}
if (!hostParms.isValid)
throw new PingUnknownHostException("Unkown host: " + ipAddress);
for (int ix = 0; ix < _numberOfPings; ix++)
{
reply = myPing.Send(ipAddress, buf, iTimeout, myPingOptions);
string sReply = "";
if (reply.Status == IPStatus.Success)
{
//sumRoundtripTime += reply.RoundTripTime;
_replyStats.add(1, 1, reply.RoundTripTime);
sReply = myResources.getReply(reply, ipAddress);
}
else if (reply.Status == IPStatus.DestinationHostUnreachable)
{
_replyStats.add(1, 0, reply.RoundTripTime);
throw new PingUnknownHostException("Destination unreachable");
}
else
{
_replyStats.add(1, 0, reply.RoundTripTime);
sReply = myResources.getReply(reply, ipAddress);
}
System.Diagnostics.Debug.WriteLine(sReply);
onReply(new PingReplyEventArgs(sReply));
}
onReply(new PingReplyEventArgs(_replyStats.ToString(), PingReplyTypes.info));
}
catch (PingUnknownHostException ex)
{
System.Diagnostics.Debug.WriteLine("PingUnknownHostException: " + ex.Message);
onReply(new PingReplyEventArgs("Unknown host: "+ ipAddress, PingReplyTypes.info));
}
catch (PingException ex)
{
System.Diagnostics.Debug.WriteLine("PingException: " + ex.Message);
}
catch (ThreadAbortException ex)
{
onReply(new PingReplyEventArgs("ping failed", PingReplyTypes.info));
Thread.CurrentThread.Abort();
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("PingException: " + ex.Message);
}
finally
{
onReply(new PingReplyEventArgs("done", PingReplyTypes.done));
System.Diagnostics.Debug.WriteLine("---thread ended");
}
}
//thread to do ping
public void startPing(string sHost, PingOptions pOptions)
{
System.Diagnostics.Debug.WriteLine("+++thread started");
string ipAddress = sHost; //make a local copy
Ping myPing = new Ping();
PingOptions myPingOptions = pOptions; //make a local copy
int iTimeout = pOptions.TimeOut;
int _numberOfPings = pOptions.numOfPings;
bool doNotFragment = pOptions.DontFragment;
int bufferSize = pOptions.bufferSize;
byte[] buf = new byte[bufferSize];
//long sumRoundtripTime=0;
onReply(new PingReplyEventArgs("ping started...", PingReplyTypes.info));
replyStats _replyStats = new replyStats(ipAddress);
PingReply reply = null;
try
{
onReply(new PingReplyEventArgs(pOptions.ToString(), PingReplyTypes.info));
//check DNS first as this may block for long time
IPAddress address;
HostParms hostParms = new HostParms(ipAddress, 4);
try
{
//is IP address
address = IPAddress.Parse(ipAddress);
hostParms.isValid = true;
}
catch
{
if (checkHost(ref hostParms))
{
ipAddress = hostParms.ipAddress.ToString();
}
}
if (!hostParms.isValid)
{
throw new PingUnknownHostException("Unkown host: " + ipAddress);
}
for (int ix = 0; ix < _numberOfPings; ix++)
{
reply = myPing.Send(ipAddress, buf, iTimeout, myPingOptions);
string sReply = "";
if (reply.Status == IPStatus.Success)
{
//sumRoundtripTime += reply.RoundTripTime;
_replyStats.add(1, 1, reply.RoundTripTime);
sReply = myResources.getReply(reply, ipAddress);
}
else if (reply.Status == IPStatus.DestinationHostUnreachable)
{
_replyStats.add(1, 0, reply.RoundTripTime);
throw new PingUnknownHostException("Destination unreachable");
}
else
{
_replyStats.add(1, 0, reply.RoundTripTime);
sReply = myResources.getReply(reply, ipAddress);
}
System.Diagnostics.Debug.WriteLine(sReply);
onReply(new PingReplyEventArgs(sReply));
}
onReply(new PingReplyEventArgs(_replyStats.ToString(), PingReplyTypes.info));
}
catch (PingUnknownHostException ex)
{
System.Diagnostics.Debug.WriteLine("PingUnknownHostException: " + ex.Message);
onReply(new PingReplyEventArgs("Unknown host: " + ipAddress, PingReplyTypes.info));
}
catch (PingException ex)
{
System.Diagnostics.Debug.WriteLine("PingException: " + ex.Message);
}
catch (ThreadAbortException ex)
{
onReply(new PingReplyEventArgs("ping failed", PingReplyTypes.info));
Thread.CurrentThread.Abort();
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("PingException: " + ex.Message);
}
finally
{
onReply(new PingReplyEventArgs("done", PingReplyTypes.done));
System.Diagnostics.Debug.WriteLine("---thread ended");
}
}
