internal extern static uint Icmp6SendEcho2(SafeCloseIcmpHandle icmpHandle, IntPtr Event, IntPtr apcRoutine, IntPtr apcContext,
byte[] sourceSocketAddress, byte[] destSocketAddress, [In] SafeLocalAllocHandle data, ushort dataSize, ref IPOptions options, SafeLocalAllocHandle replyBuffer, uint replySize, uint timeout);
// internal method responsible for sending echo request on win2k and higher
private PingReply InternalSend (IPAddress address, byte[] buffer, int timeout, PingOptions options, bool async) {
ipv6 = (address.AddressFamily == AddressFamily.InterNetworkV6)?true:false;
sendSize = buffer.Length;
//get and cache correct handle
if (!ipv6 && handlePingV4 == null) {
handlePingV4 = UnsafeNetInfoNativeMethods.IcmpCreateFile ();
if (handlePingV4.IsInvalid) {
handlePingV4 = null;
throw new Win32Exception(); // Gets last error
}
}
else if (ipv6 && handlePingV6 == null) {
handlePingV6 = UnsafeNetInfoNativeMethods.Icmp6CreateFile();
if (handlePingV6.IsInvalid) {
handlePingV6 = null;
throw new Win32Exception(); // Gets last error
}
}
//setup the options
IPOptions ipOptions = new IPOptions (options);
//setup the reply buffer
if (replyBuffer == null) {
replyBuffer = SafeLocalFree.LocalAlloc (MaxUdpPacket);
}
//queue the event
int error;
try
{
if (async) {
if (pingEvent == null)
pingEvent = new ManualResetEvent (false);
else
pingEvent.Reset();
registeredWait = ThreadPool.RegisterWaitForSingleObject (pingEvent, new WaitOrTimerCallback (PingCallback), this, -1, true);
}
//Copy user dfata into the native world
SetUnmanagedStructures (buffer);
if (!ipv6) {
if (async) {
error = (int)UnsafeNetInfoNativeMethods.IcmpSendEcho2 (handlePingV4, pingEvent.SafeWaitHandle, IntPtr.Zero, IntPtr.Zero, (uint)address.m_Address, requestBuffer, (ushort)buffer.Length, ref ipOptions, replyBuffer, MaxUdpPacket, (uint)timeout);
}
else{
error = (int)UnsafeNetInfoNativeMethods.IcmpSendEcho2 (handlePingV4, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)address.m_Address, requestBuffer, (ushort)buffer.Length, ref ipOptions, replyBuffer, MaxUdpPacket, (uint)timeout);
}
}
else {
IPEndPoint ep = new IPEndPoint (address, 0);
SocketAddress remoteAddr = ep.Serialize ();
byte[] sourceAddr = new byte[28];
if(async){
error = (int)UnsafeNetInfoNativeMethods.Icmp6SendEcho2 (handlePingV6, pingEvent.SafeWaitHandle, IntPtr.Zero, IntPtr.Zero, sourceAddr, remoteAddr.m_Buffer, requestBuffer, (ushort)buffer.Length, ref ipOptions, replyBuffer, MaxUdpPacket, (uint)timeout);
}
else{
error = (int)UnsafeNetInfoNativeMethods.Icmp6SendEcho2 (handlePingV6, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, sourceAddr, remoteAddr.m_Buffer, requestBuffer, (ushort)buffer.Length, ref ipOptions, replyBuffer, MaxUdpPacket, (uint)timeout);
}
}
}
catch
{
UnregisterWaitHandle();
throw;
}
//need this if something is bogus.
if (error == 0) {
error = (int)Marshal.GetLastWin32Error();
// Only skip Async IO Pending error value
if (async && error == UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING)
return null; // Expected async return value
// Cleanup
FreeUnmanagedStructures();
UnregisterWaitHandle();
if (async // No IPStatus async errors
|| error < (int)IPStatus.DestinationNetworkUnreachable // Min
|| error > (int)IPStatus.DestinationScopeMismatch) // Max // Out of IPStatus range
throw new Win32Exception(error);
return new PingReply((IPStatus)error); // Synchronous IPStatus errors
}
if (async) {
return null;
}
FreeUnmanagedStructures ();
//return the reply
PingReply reply;
if (ipv6) {
Icmp6EchoReply icmp6Reply = (Icmp6EchoReply)Marshal.PtrToStructure(replyBuffer.DangerousGetHandle(), typeof(Icmp6EchoReply));
reply = new PingReply(icmp6Reply, replyBuffer.DangerousGetHandle(), sendSize);
}
else {
IcmpEchoReply icmpReply = (IcmpEchoReply)Marshal.PtrToStructure(replyBuffer.DangerousGetHandle(), typeof(IcmpEchoReply));
reply = new PingReply(icmpReply);
}
// IcmpEchoReply still has an unsafe IntPtr reference into replybuffer
// and replybuffer was being freed prematurely by the GC, causing AccessViolationExceptions.
GC.KeepAlive(replyBuffer);
return reply;
}
internal extern static uint IcmpSendEcho2(SafeCloseIcmpHandle icmpHandle, SafeWaitHandle Event, IntPtr apcRoutine, IntPtr apcContext,
uint ipAddress, [In] SafeLocalAllocHandle data, ushort dataSize, ref IPOptions options, SafeLocalAllocHandle replyBuffer, uint replySize, uint timeout);
//cancel pending async requests, close the handles
private void InternalDispose () {
disposeRequested = true;
if (Interlocked.CompareExchange(ref status, Disposed, Free) != Free)
{
// Already disposed, or Finish will call Dispose again once Free
return;
}
if (handlePingV4 != null) {
handlePingV4.Close ();
handlePingV4 = null;
}
if (handlePingV6 != null) {
handlePingV6.Close ();
handlePingV6 = null;
}
UnregisterWaitHandle();
if (pingEvent != null) {
pingEvent.Close();
pingEvent = null;
}
if (replyBuffer != null) {
replyBuffer.Close();
replyBuffer = null;
}
if (asyncFinished != null) {
asyncFinished.Close();
asyncFinished = null;
}
}