private static PingReply CreatePingReplyFromIcmpEchoReply(Interop.IpHlpApi.IcmpEchoReply reply)
{
const int DontFragmentFlag = 2;
IPAddress address = new IPAddress(reply.address);
IPStatus ipStatus = (IPStatus)reply.status; // The icmpsendecho IP status codes.
long rtt;
PingOptions options;
byte[] buffer;
rtt = reply.roundTripTime;
if (ipStatus == IPStatus.Success)
{
// Only copy the data if we succeed w/ the ping operation.
options = new PingOptions(reply.options.ttl, (reply.options.flags & DontFragmentFlag) > 0);
buffer = new byte[reply.dataSize];
Marshal.Copy(reply.data, buffer, 0, reply.dataSize);
}
else
{
options = default(PingOptions);
buffer = Array.Empty <byte>();
}
return(new PingReply(address, options, ipStatus, rtt, buffer));
}
// Private callback invoked when icmpsendecho APIs succeed.
private void PingCallback()
{
TaskCompletionSource <PingReply> tcs = _taskCompletionSource;
_taskCompletionSource = null;
PingReply reply = null;
Exception error = null;
bool canceled = false;
try
{
lock (_lockObject)
{
canceled = _canceled;
// Parse reply buffer.
SafeLocalAllocHandle buffer = _replyBuffer;
// Marshals and constructs new reply.
if (_ipv6)
{
Interop.IpHlpApi.Icmp6EchoReply icmp6Reply = Marshal.PtrToStructure <Interop.IpHlpApi.Icmp6EchoReply>(buffer.DangerousGetHandle());
reply = CreatePingReplyFromIcmp6EchoReply(icmp6Reply, buffer.DangerousGetHandle(), _sendSize);
}
else
{
Interop.IpHlpApi.IcmpEchoReply icmpReply = Marshal.PtrToStructure <Interop.IpHlpApi.IcmpEchoReply>(buffer.DangerousGetHandle());
reply = CreatePingReplyFromIcmpEchoReply(icmpReply);
}
}
}
catch (Exception e)
{
// In case of failure, create a failed event arg.
error = new PingException(SR.net_ping, e);
}
finally
{
FreeUnmanagedStructures();
UnregisterWaitHandle();
Finish();
}
// Once we've called Finish, complete the task
if (canceled)
{
tcs.SetCanceled();
}
else if (reply != null)
{
tcs.SetResult(reply);
}
else
{
Debug.Assert(error != null);
tcs.SetException(error);
}
}
