/*private*/
partial void InternalDisposeCore()
{
if (_handlePingV4 != null)
{
_handlePingV4.Dispose();
_handlePingV4 = null;
}
if (_handlePingV6 != null)
{
_handlePingV6.Dispose();
_handlePingV6 = null;
}
UnregisterWaitHandle();
if (_pingEvent != null)
{
_pingEvent.Dispose();
_pingEvent = null;
}
if (_replyBuffer != null)
{
_replyBuffer.Dispose();
_replyBuffer = null;
}
}
// Any exceptions that escape synchronously will be caught by the caller and wrapped in a PingException.
// We do not need to or want to capture such exceptions into the returned task.
private Task <PingReply> SendPingAsyncCore(IPAddress address, byte[] buffer, int timeout, PingOptions options)
{
var tcs = new TaskCompletionSource <PingReply>();
_taskCompletionSource = tcs;
_ipv6 = (address.AddressFamily == AddressFamily.InterNetworkV6);
_sendSize = buffer.Length;
// Get and cache correct handle.
if (!_ipv6 && _handlePingV4 == null)
{
_handlePingV4 = Interop.IpHlpApi.IcmpCreateFile();
if (_handlePingV4.IsInvalid)
{
_handlePingV4 = null;
throw new Win32Exception(); // Gets last error.
}
}
else if (_ipv6 && _handlePingV6 == null)
{
_handlePingV6 = Interop.IpHlpApi.Icmp6CreateFile();
if (_handlePingV6.IsInvalid)
{
_handlePingV6 = null;
throw new Win32Exception(); // Gets last error.
}
}
var ipOptions = new Interop.IpHlpApi.IPOptions(options);
if (_replyBuffer == null)
{
_replyBuffer = SafeLocalAllocHandle.LocalAlloc(MaxUdpPacket);
}
// Queue the event.
int error;
try
{
if (_pingEvent == null)
{
_pingEvent = new ManualResetEvent(false);
}
else
{
_pingEvent.Reset();
}
_registeredWait = ThreadPool.RegisterWaitForSingleObject(_pingEvent, (state, _) => ((Ping)state).PingCallback(), this, -1, true);
SetUnmanagedStructures(buffer);
if (!_ipv6)
{
SafeWaitHandle pingEventSafeWaitHandle = _pingEvent.GetSafeWaitHandle();
error = (int)Interop.IpHlpApi.IcmpSendEcho2(
_handlePingV4,
pingEventSafeWaitHandle,
IntPtr.Zero,
IntPtr.Zero,
(uint)address.GetAddress(),
_requestBuffer,
(ushort)buffer.Length,
ref ipOptions,
_replyBuffer,
MaxUdpPacket,
(uint)timeout);
}
else
{
IPEndPoint ep = new IPEndPoint(address, 0);
SystemNet.Internals.SocketAddress remoteAddr = IPEndPointExtensions.Serialize(ep);
byte[] sourceAddr = new byte[28];
SafeWaitHandle pingEventSafeWaitHandle = _pingEvent.GetSafeWaitHandle();
error = (int)Interop.IpHlpApi.Icmp6SendEcho2(
_handlePingV6,
pingEventSafeWaitHandle,
IntPtr.Zero,
IntPtr.Zero,
sourceAddr,
remoteAddr.Buffer,
_requestBuffer,
(ushort)buffer.Length,
ref ipOptions,
_replyBuffer,
MaxUdpPacket,
(uint)timeout);
}
}
catch
{
UnregisterWaitHandle();
throw;
}
if (error == 0)
{
error = Marshal.GetLastWin32Error();
// Only skip Async IO Pending error value.
if (error != Interop.IpHlpApi.ERROR_IO_PENDING)
{
// Cleanup.
FreeUnmanagedStructures();
UnregisterWaitHandle();
throw new Win32Exception(error);
}
}
return(tcs.Task);
}