//private callback invoked when icmpsendecho apis succeed
private static void PingCallback(object state, bool signaled)
{
Ping ping = (Ping)state;
PingCompletedEventArgs eventArgs = null;
bool cancelled = false;
AsyncOperation asyncOp = null;
SendOrPostCallback onPingCompletedDelegate = null;
try
{
lock (ping.lockObject) {
cancelled = ping.cancelled;
asyncOp = ping.asyncOp;
onPingCompletedDelegate = ping.onPingCompletedDelegate;
if (!cancelled)
{
//parse reply buffer
SafeLocalFree buffer = ping.replyBuffer;
//marshals and constructs new reply
PingReply reply;
if (ping.ipv6)
{
Icmp6EchoReply icmp6Reply = (Icmp6EchoReply)Marshal.PtrToStructure(buffer.DangerousGetHandle(), typeof(Icmp6EchoReply));
reply = new PingReply(icmp6Reply, buffer.DangerousGetHandle(), ping.sendSize);
}
else
{
IcmpEchoReply icmpReply = (IcmpEchoReply)Marshal.PtrToStructure(buffer.DangerousGetHandle(), typeof(IcmpEchoReply));
reply = new PingReply(icmpReply);
}
eventArgs = new PingCompletedEventArgs(reply, null, false, asyncOp.UserSuppliedState);
}
else //cancelled
{
eventArgs = new PingCompletedEventArgs(null, null, true, asyncOp.UserSuppliedState);
}
}
}
// in case of failure, create a failed event arg
catch (Exception e) {
PingException pe = new PingException(SR.GetString(SR.net_ping), e);
eventArgs = new PingCompletedEventArgs(null, pe, false, asyncOp.UserSuppliedState);
}
finally {
ping.FreeUnmanagedStructures();
ping.UnregisterWaitHandle();
ping.Finish(true);
}
asyncOp.PostOperationCompleted(onPingCompletedDelegate, eventArgs);
}
private static void PingCallback(object state, bool signaled)
{
Ping ping = (Ping)state;
PingCompletedEventArgs arg = null;
bool cancelled = false;
AsyncOperation asyncOp = null;
SendOrPostCallback d = null;
try
{
lock (ping.lockObject)
{
cancelled = ping.cancelled;
asyncOp = ping.asyncOp;
d = ping.onPingCompletedDelegate;
if (!cancelled)
{
PingReply reply;
SafeLocalFree replyBuffer = ping.replyBuffer;
if (!ping.ipv6 && !ComNetOS.IsVista)
{
UnsafeNetInfoNativeMethods.IcmpParseReplies(replyBuffer.DangerousGetHandle(), 0x100ff);
}
if (ping.ipv6)
{
Icmp6EchoReply reply2 = (Icmp6EchoReply)Marshal.PtrToStructure(replyBuffer.DangerousGetHandle(), typeof(Icmp6EchoReply));
reply = new PingReply(reply2, replyBuffer.DangerousGetHandle(), ping.sendSize);
}
else
{
IcmpEchoReply reply3 = (IcmpEchoReply)Marshal.PtrToStructure(replyBuffer.DangerousGetHandle(), typeof(IcmpEchoReply));
reply = new PingReply(reply3);
}
arg = new PingCompletedEventArgs(reply, null, false, asyncOp.UserSuppliedState);
}
else
{
arg = new PingCompletedEventArgs(null, null, true, asyncOp.UserSuppliedState);
}
}
}
catch (Exception exception)
{
PingException error = new PingException(SR.GetString("net_ping"), exception);
arg = new PingCompletedEventArgs(null, error, false, asyncOp.UserSuppliedState);
}
finally
{
ping.FreeUnmanagedStructures();
ping.UnregisterWaitHandle();
ping.Finish(true);
}
asyncOp.PostOperationCompleted(d, arg);
}
internal PingReply(Icmp6EchoReply reply, IntPtr dataPtr, int sendSize)
{
this.address = new IPAddress(reply.Address.Address, (long)reply.Address.ScopeID);
this.ipStatus = (IPStatus)reply.Status;
if (this.ipStatus == IPStatus.Success)
{
this.rtt = reply.RoundTripTime;
this.buffer = new byte[sendSize];
Marshal.Copy(IntPtrHelper.Add(dataPtr, 0x24), this.buffer, 0, sendSize);
}
else
{
this.buffer = new byte[0];
}
}
internal PingReply(Icmp6EchoReply reply, IntPtr dataPtr, int sendSize)
{
this.address = new IPAddress(reply.Address.Address, (long) reply.Address.ScopeID);
this.ipStatus = (IPStatus) reply.Status;
if (this.ipStatus == IPStatus.Success)
{
this.rtt = reply.RoundTripTime;
this.buffer = new byte[sendSize];
Marshal.Copy(IntPtrHelper.Add(dataPtr, 0x24), this.buffer, 0, sendSize);
}
else
{
this.buffer = new byte[0];
}
}
// the main constructor for the icmpsendecho apis
internal PingReply (Icmp6EchoReply reply, IntPtr dataPtr, int sendSize) {
address = new IPAddress(reply.Address.Address,reply.Address.ScopeID);
ipStatus = (IPStatus)reply.Status; //the icmpsendecho ip status codes
//only copy the data if we succeed w/ the ping operation
if (ipStatus == IPStatus.Success) {
rtt = (long)reply.RoundTripTime;
buffer = new byte[sendSize];
Marshal.Copy (IntPtrHelper.Add(dataPtr, 36), buffer, 0, sendSize);
//options = new PingOptions (reply.options);
}
else
buffer = new byte[0];
}
// the main constructor for the icmpsendecho apis
internal PingReply(Icmp6EchoReply reply, IntPtr dataPtr, int sendSize)
{
address = new IPAddress(reply.Address.Address, reply.Address.ScopeID);
ipStatus = (IPStatus)reply.Status; //the icmpsendecho ip status codes
//only copy the data if we succeed w/ the ping operation
if (ipStatus == IPStatus.Success)
{
rtt = (long)reply.RoundTripTime;
buffer = new byte[sendSize];
Marshal.Copy(IntPtrHelper.Add(dataPtr, 36), buffer, 0, sendSize);
//options = new PingOptions (reply.options);
}
else
{
buffer = new byte[0];
}
}
private PingReply InternalSend(IPAddress address, byte[] buffer, int timeout, PingOptions options, bool async)
{
int num;
PingReply reply;
this.ipv6 = address.AddressFamily == AddressFamily.InterNetworkV6;
this.sendSize = buffer.Length;
if (!this.ipv6 && (this.handlePingV4 == null))
{
this.handlePingV4 = UnsafeNetInfoNativeMethods.IcmpCreateFile();
if (this.handlePingV4.IsInvalid)
{
this.handlePingV4 = null;
throw new Win32Exception();
}
}
else if (this.ipv6 && (this.handlePingV6 == null))
{
this.handlePingV6 = UnsafeNetInfoNativeMethods.Icmp6CreateFile();
if (this.handlePingV6.IsInvalid)
{
this.handlePingV6 = null;
throw new Win32Exception();
}
}
IPOptions options2 = new IPOptions(options);
if (this.replyBuffer == null)
{
this.replyBuffer = SafeLocalFree.LocalAlloc(0x100ff);
}
try
{
if (async)
{
if (this.pingEvent == null)
{
this.pingEvent = new ManualResetEvent(false);
}
else
{
this.pingEvent.Reset();
}
this.registeredWait = ThreadPool.RegisterWaitForSingleObject(this.pingEvent, new WaitOrTimerCallback(Ping.PingCallback), this, -1, true);
}
this.SetUnmanagedStructures(buffer);
if (!this.ipv6)
{
if (async)
{
num = (int)UnsafeNetInfoNativeMethods.IcmpSendEcho2(this.handlePingV4, this.pingEvent.SafeWaitHandle, IntPtr.Zero, IntPtr.Zero, (uint)address.m_Address, this.requestBuffer, (ushort)buffer.Length, ref options2, this.replyBuffer, 0x100ff, (uint)timeout);
}
else
{
num = (int)UnsafeNetInfoNativeMethods.IcmpSendEcho2(this.handlePingV4, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, (uint)address.m_Address, this.requestBuffer, (ushort)buffer.Length, ref options2, this.replyBuffer, 0x100ff, (uint)timeout);
}
}
else
{
SocketAddress address2 = new IPEndPoint(address, 0).Serialize();
byte[] sourceSocketAddress = new byte[0x1c];
if (async)
{
num = (int)UnsafeNetInfoNativeMethods.Icmp6SendEcho2(this.handlePingV6, this.pingEvent.SafeWaitHandle, IntPtr.Zero, IntPtr.Zero, sourceSocketAddress, address2.m_Buffer, this.requestBuffer, (ushort)buffer.Length, ref options2, this.replyBuffer, 0x100ff, (uint)timeout);
}
else
{
num = (int)UnsafeNetInfoNativeMethods.Icmp6SendEcho2(this.handlePingV6, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, sourceSocketAddress, address2.m_Buffer, this.requestBuffer, (ushort)buffer.Length, ref options2, this.replyBuffer, 0x100ff, (uint)timeout);
}
}
}
catch
{
this.UnregisterWaitHandle();
throw;
}
if (num == 0)
{
num = Marshal.GetLastWin32Error();
if (async && (num == 0x3e5L))
{
return(null);
}
this.FreeUnmanagedStructures();
this.UnregisterWaitHandle();
if ((async || (num < 0x2afa)) || (num > 0x2b25))
{
throw new Win32Exception(num);
}
return(new PingReply((IPStatus)num));
}
if (async)
{
return(null);
}
this.FreeUnmanagedStructures();
if (this.ipv6)
{
Icmp6EchoReply reply2 = (Icmp6EchoReply)Marshal.PtrToStructure(this.replyBuffer.DangerousGetHandle(), typeof(Icmp6EchoReply));
reply = new PingReply(reply2, this.replyBuffer.DangerousGetHandle(), this.sendSize);
}
else
{
IcmpEchoReply reply3 = (IcmpEchoReply)Marshal.PtrToStructure(this.replyBuffer.DangerousGetHandle(), typeof(IcmpEchoReply));
reply = new PingReply(reply3);
}
GC.KeepAlive(this.replyBuffer);
return(reply);
}
// 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);
}
