Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Sockets / _ReceiveMessageOverlappedAsyncResult.cs / 1 / _ReceiveMessageOverlappedAsyncResult.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Sockets { using System; using System.Net; using System.Runtime.InteropServices; using System.Threading; using Microsoft.Win32; using System.Collections.Generic; // // OverlappedAsyncResult - used to take care of storage for async Socket operation // from the BeginSend, BeginSendTo, BeginReceive, BeginReceiveFrom calls. // unsafe internal class ReceiveMessageOverlappedAsyncResult: BaseOverlappedAsyncResult { // // internal class members // private UnsafeNclNativeMethods.OSSOCK.WSAMsg* m_Message; internal SocketAddress SocketAddressOriginal; internal SocketAddress m_SocketAddress; private WSABuffer* m_WSABuffer; private byte[] m_WSABufferArray; private byte[] m_ControlBuffer; internal byte[] m_MessageBuffer; internal SocketFlags m_flags; private static readonly int s_ControlDataSize = Marshal.SizeOf(typeof(UnsafeNclNativeMethods.OSSOCK.ControlData)); private static readonly int s_ControlDataIPv6Size = Marshal.SizeOf(typeof(UnsafeNclNativeMethods.OSSOCK.ControlDataIPv6)); private static readonly int s_WSABufferSize=Marshal.SizeOf(typeof(WSABuffer)); private static readonly int s_WSAMsgSize = Marshal.SizeOf(typeof(UnsafeNclNativeMethods.OSSOCK.WSAMsg)); internal IPPacketInformation m_IPPacketInformation; // // the following two will be used only on WinNT to enable completion ports // // // Constructor. We take in the socket that's creating us, the caller's // state object, and the buffer on which the I/O will be performed. // We save the socket and state, pin the callers's buffer, and allocate // an event for the WaitHandle. // internal ReceiveMessageOverlappedAsyncResult(Socket socket, Object asyncState, AsyncCallback asyncCallback) : base(socket, asyncState, asyncCallback) { } internal IntPtr GetSocketAddressSizePtr() { return Marshal.UnsafeAddrOfPinnedArrayElement(m_SocketAddress.m_Buffer, m_SocketAddress.GetAddressSizeOffset()); } internal SocketAddress SocketAddress { get { return m_SocketAddress; } } // // SetUnmanagedStructures - // Fills in Overlapped Structures used in an Async Overlapped Winsock call // these calls are outside the runtime and are unmanaged code, so we need // to prepare specific structures and ints that lie in unmanaged memory // since the Overlapped calls can be Async // internal void SetUnmanagedStructures(byte[] buffer, int offset, int size, SocketAddress socketAddress, SocketFlags socketFlags) { //ipv4 or ipv6? bool ipv4 = ((Socket)(AsyncObject)).AddressFamily == AddressFamily.InterNetwork; bool ipv6 = ((Socket)(AsyncObject)).AddressFamily == AddressFamily.InterNetworkV6; m_MessageBuffer = new byte[s_WSAMsgSize]; m_WSABufferArray = new byte[s_WSABufferSize]; //prepare control buffer if (ipv4) { m_ControlBuffer = new byte[s_ControlDataSize]; } else if (ipv6) { m_ControlBuffer = new byte[s_ControlDataIPv6Size]; } //pin buffers object[] objectsToPin = new object[(m_ControlBuffer != null)?5:4]; objectsToPin[0] = buffer; objectsToPin[1] = m_MessageBuffer; objectsToPin[2] = m_WSABufferArray; //prepare socketaddress buffer m_SocketAddress = socketAddress; m_SocketAddress.CopyAddressSizeIntoBuffer(); objectsToPin[3] = m_SocketAddress.m_Buffer; if(m_ControlBuffer != null){ objectsToPin[4] = m_ControlBuffer; } base.SetUnmanagedStructures(objectsToPin); //prepare data buffer m_WSABuffer = (WSABuffer*) Marshal.UnsafeAddrOfPinnedArrayElement(m_WSABufferArray, 0); m_WSABuffer->Length = size; m_WSABuffer->Pointer = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset); //setup structure m_Message = (UnsafeNclNativeMethods.OSSOCK.WSAMsg*) Marshal.UnsafeAddrOfPinnedArrayElement(m_MessageBuffer, 0); m_Message->socketAddress = Marshal.UnsafeAddrOfPinnedArrayElement(m_SocketAddress.m_Buffer,0); m_Message->addressLength = (uint)m_SocketAddress.Size; m_Message->buffers = Marshal.UnsafeAddrOfPinnedArrayElement(m_WSABufferArray,0); m_Message->count = 1; if(m_ControlBuffer != null){ m_Message->controlBuffer.Pointer = Marshal.UnsafeAddrOfPinnedArrayElement(m_ControlBuffer, 0); m_Message->controlBuffer.Length = m_ControlBuffer.Length; } m_Message->flags = socketFlags; } internal void SetUnmanagedStructures(byte[] buffer, int offset, int size, SocketAddress socketAddress, SocketFlags socketFlags, ref OverlappedCache overlappedCache) { SetupCache(ref overlappedCache); SetUnmanagedStructures(buffer, offset, size, socketAddress, socketFlags); } unsafe private void InitIPPacketInformation(){ IPAddress address = null; //ipv4 if (m_ControlBuffer.Length == s_ControlDataSize) { UnsafeNclNativeMethods.OSSOCK.ControlData controlData = (UnsafeNclNativeMethods.OSSOCK.ControlData)Marshal.PtrToStructure(m_Message->controlBuffer.Pointer, typeof(UnsafeNclNativeMethods.OSSOCK.ControlData)); if(controlData.length != UIntPtr.Zero) { address = new IPAddress((long)controlData.address); } m_IPPacketInformation = new IPPacketInformation(((address!=null)?address:IPAddress.None),(int)controlData.index); } //ipv6 else if (m_ControlBuffer.Length == s_ControlDataIPv6Size){ UnsafeNclNativeMethods.OSSOCK.ControlDataIPv6 controlData = (UnsafeNclNativeMethods.OSSOCK.ControlDataIPv6)Marshal.PtrToStructure(m_Message->controlBuffer.Pointer, typeof(UnsafeNclNativeMethods.OSSOCK.ControlDataIPv6)); if (controlData.length != UIntPtr.Zero) { address = new IPAddress(controlData.address); } m_IPPacketInformation = new IPPacketInformation(((address!=null)?address:IPAddress.IPv6None),(int)controlData.index); } //other else{ m_IPPacketInformation = new IPPacketInformation(); } } // // This method is called after an asynchronous call is made for the user, // it checks and acts accordingly if the IO: // 1) completed synchronously. // 2) was pended. // 3) failed. // internal void SyncReleaseUnmanagedStructures() { InitIPPacketInformation(); ForceReleaseUnmanagedStructures(); } protected override void ForceReleaseUnmanagedStructures() { m_flags = m_Message->flags; base.ForceReleaseUnmanagedStructures(); } internal override object PostCompletion(int numBytes) { InitIPPacketInformation(); if (ErrorCode == 0) { if(Logging.On)LogBuffer(numBytes); } return (int)numBytes; } void LogBuffer(int size) { GlobalLog.Assert(Logging.On, "ReceiveMessageOverlappedAsyncResult#{0}::LogBuffer()|Logging is off!", ValidationHelper.HashString(this)); Logging.Dump(Logging.Sockets, AsyncObject, "PostCompletion", m_WSABuffer->Pointer, Math.Min(m_WSABuffer->Length, size)); } }; // class OverlappedAsyncResult } // namespace System.Net.Sockets
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