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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Threading.Tasks.Sources;
namespace System.Net.Sockets
{
public partial class SocketAsyncEventArgs : EventArgs, IDisposable
{
// AcceptSocket property variables.
private Socket? _acceptSocket;
private Socket? _connectSocket;
// Single buffer.
private Memory<byte> _buffer;
private int _offset;
private int _count;
private bool _bufferIsExplicitArray;
// BufferList property variables.
private IList<ArraySegment<byte>>? _bufferList;
private List<ArraySegment<byte>>? _bufferListInternal;
// BytesTransferred property variables.
private int _bytesTransferred;
// DisconnectReuseSocket property variables.
private bool _disconnectReuseSocket;
// LastOperation property variables.
private SocketAsyncOperation _completedOperation;
// ReceiveMessageFromPacketInfo property variables.
private IPPacketInformation _receiveMessageFromPacketInfo;
// RemoteEndPoint property variables.
private EndPoint? _remoteEndPoint;
// SendPacketsSendSize property variable.
private int _sendPacketsSendSize;
// SendPacketsElements property variables.
private SendPacketsElement[]? _sendPacketsElements;
// SendPacketsFlags property variable.
private TransmitFileOptions _sendPacketsFlags;
// SocketError property variables.
private SocketError _socketError;
private Exception? _connectByNameError;
// SocketFlags property variables.
private SocketFlags _socketFlags;
// UserToken property variables.
private object? _userToken;
// Internal buffer for AcceptEx when Buffer not supplied.
private byte[]? _acceptBuffer;
private int _acceptAddressBufferCount;
// Internal SocketAddress buffer.
internal SocketAddress? _socketAddress;
// Misc state variables.
private readonly bool _flowExecutionContext;
private ExecutionContext? _context;
private static readonly ContextCallback s_executionCallback = ExecutionCallback;
private Socket? _currentSocket;
private bool _userSocket; // if false when performing Connect, _currentSocket should be disposed
private bool _disposeCalled;
// Controls thread safety via Interlocked.
private const int Configuring = -1;
private const int Free = 0;
private const int InProgress = 1;
private const int Disposed = 2;
private int _operating;
private CancellationTokenSource? _multipleConnectCancellation;
public SocketAsyncEventArgs() : this(unsafeSuppressExecutionContextFlow: false)
{
}
/// <summary>Initialize the SocketAsyncEventArgs</summary>
/// <param name="unsafeSuppressExecutionContextFlow">
/// Whether to disable the capturing and flow of ExecutionContext. ExecutionContext flow should only
/// be disabled if it's going to be handled by higher layers.
/// </param>
public SocketAsyncEventArgs(bool unsafeSuppressExecutionContextFlow)
{
_flowExecutionContext = !unsafeSuppressExecutionContextFlow;
InitializeInternals();
}
public Socket? AcceptSocket
{
get { return _acceptSocket; }
set { _acceptSocket = value; }
}
public Socket? ConnectSocket
{
get { return _connectSocket; }
}
public byte[]? Buffer
{
get
{
if (_bufferIsExplicitArray)
{
bool success = MemoryMarshal.TryGetArray(_buffer, out ArraySegment<byte> arraySegment);
Debug.Assert(success);
return arraySegment.Array;
}
return null;
}
}
public Memory<byte> MemoryBuffer => _buffer;
public int Offset => _offset;
public int Count => _count;
// SendPacketsFlags property.
public TransmitFileOptions SendPacketsFlags
{
get { return _sendPacketsFlags; }
set { _sendPacketsFlags = value; }
}
// NOTE: this property is mutually exclusive with Buffer.
// Setting this property with an existing non-null Buffer will throw.
public IList<ArraySegment<byte>>? BufferList
{
get { return _bufferList; }
set
{
StartConfiguring();
try
{
if (value != null)
{
if (!_buffer.Equals(default))
{
// Can't have both set
throw new ArgumentException(SR.net_ambiguousbuffers);
}
// Copy the user-provided list into our internal buffer list,
// so that we are not affected by subsequent changes to the list.
// We reuse the existing list so that we can avoid reallocation when possible.
int bufferCount = value.Count;
if (_bufferListInternal == null)
{
_bufferListInternal = new List<ArraySegment<byte>>(bufferCount);
}
else
{
_bufferListInternal.Clear();
}
for (int i = 0; i < bufferCount; i++)
{
ArraySegment<byte> buffer = value[i];
RangeValidationHelpers.ValidateSegment(buffer);
_bufferListInternal.Add(buffer);
}
}
else
{
_bufferListInternal?.Clear();
}
_bufferList = value;
SetupMultipleBuffers();
}
finally
{
Complete();
}
}
}
public int BytesTransferred
{
get { return _bytesTransferred; }
}
public event EventHandler<SocketAsyncEventArgs>? Completed;
private void OnCompletedInternal()
{
// The following check checks if the operation was Accept (1) or Connect (2)
if (LastOperation <= SocketAsyncOperation.Connect)
{
AfterConnectAcceptTelemetry();
}
OnCompleted(this);
}
protected virtual void OnCompleted(SocketAsyncEventArgs e)
{
Completed?.Invoke(e._currentSocket, e);
}
private void AfterConnectAcceptTelemetry()
{
switch (LastOperation)
{
case SocketAsyncOperation.Accept:
SocketsTelemetry.Log.AfterAccept(SocketError);
break;
case SocketAsyncOperation.Connect:
SocketsTelemetry.Log.AfterConnect(SocketError);
break;
default:
Debug.Fail($"Callers should guard against calling this method for '{LastOperation}'");
break;
}
}
// DisconnectResuseSocket property.
public bool DisconnectReuseSocket
{
get { return _disconnectReuseSocket; }
set { _disconnectReuseSocket = value; }
}
public SocketAsyncOperation LastOperation
{
get { return _completedOperation; }
}
public IPPacketInformation ReceiveMessageFromPacketInfo
{
get { return _receiveMessageFromPacketInfo; }
}
public EndPoint? RemoteEndPoint
{
get { return _remoteEndPoint; }
set { _remoteEndPoint = value; }
}
public SendPacketsElement[]? SendPacketsElements
{
get { return _sendPacketsElements; }
set
{
StartConfiguring();
try
{
_sendPacketsElements = value;
}
finally
{
Complete();
}
}
}
public int SendPacketsSendSize
{
get { return _sendPacketsSendSize; }
set { _sendPacketsSendSize = value; }
}
public SocketError SocketError
{
get { return _socketError; }
set { _socketError = value; }
}
public Exception? ConnectByNameError
{
get { return _connectByNameError; }
}
public SocketFlags SocketFlags
{
get { return _socketFlags; }
set { _socketFlags = value; }
}
public object? UserToken
{
get { return _userToken; }
set { _userToken = value; }
}
public void SetBuffer(int offset, int count)
{
StartConfiguring();
try
{
if (!_buffer.Equals(default))
{
ArgumentOutOfRangeException.ThrowIfGreaterThan((uint)offset, (uint)_buffer.Length, nameof(offset));
ArgumentOutOfRangeException.ThrowIfGreaterThan((uint)count, (long)(_buffer.Length - offset), nameof(count));
if (!_bufferIsExplicitArray)
{
throw new InvalidOperationException(SR.InvalidOperation_BufferNotExplicitArray);
}
_offset = offset;
_count = count;
}
}
finally
{
Complete();
}
}
internal void CopyBufferFrom(SocketAsyncEventArgs source)
{
StartConfiguring();
try
{
_buffer = source._buffer;
_offset = source._offset;
_count = source._count;
_bufferIsExplicitArray = source._bufferIsExplicitArray;
}
finally
{
Complete();
}
}
public void SetBuffer(byte[]? buffer, int offset, int count)
{
StartConfiguring();
try
{
if (buffer == null)
{
// Clear out existing buffer.
_buffer = default;
_offset = 0;
_count = 0;
_bufferIsExplicitArray = false;
}
else
{
// Can't have both Buffer and BufferList.
if (_bufferList != null)
{
throw new ArgumentException(SR.net_ambiguousbuffers);
}
// Offset and count can't be negative and the
// combination must be in bounds of the array.
ArgumentOutOfRangeException.ThrowIfGreaterThan((uint)offset, (uint)buffer.Length, nameof(offset));
ArgumentOutOfRangeException.ThrowIfGreaterThan((uint)count, (long)(buffer.Length - offset), nameof(count));
_buffer = buffer;
_offset = offset;
_count = count;
_bufferIsExplicitArray = true;
}
}
finally
{
Complete();
}
}
public void SetBuffer(Memory<byte> buffer)
{
StartConfiguring();
try
{
if (buffer.Length != 0 && _bufferList != null)
{
throw new ArgumentException(SR.net_ambiguousbuffers);
}
_buffer = buffer;
_offset = 0;
_count = buffer.Length;
_bufferIsExplicitArray = false;
}
finally
{
Complete();
}
}
internal bool HasMultipleBuffers => _bufferList != null;
internal void SetResults(SocketError socketError, int bytesTransferred, SocketFlags flags)
{
_socketError = socketError;
_connectByNameError = null;
_bytesTransferred = bytesTransferred;
_socketFlags = flags;
}
internal void SetResults(Exception exception, int bytesTransferred, SocketFlags flags)
{
_connectByNameError = exception;
_bytesTransferred = bytesTransferred;
_socketFlags = flags;
if (exception == null)
{
_socketError = SocketError.Success;
}
else
{
SocketException? socketException = exception as SocketException;
if (socketException != null)
{
_socketError = socketException.SocketErrorCode;
}
else
{
_socketError = SocketError.SocketError;
}
}
}
private static void ExecutionCallback(object? state)
{
var thisRef = (SocketAsyncEventArgs)state!;
thisRef.OnCompletedInternal();
}
// Marks this object as no longer "in-use". Will also execute a Dispose deferred
// because I/O was in progress.
internal void Complete()
{
CompleteCore();
// Clear any ExecutionContext that may have been captured.
_context = null;
// Mark as not in-use.
_operating = Free;
// Check for deferred Dispose().
// The deferred Dispose is not guaranteed if Dispose is called while an operation is in progress.
// The _disposeCalled variable is not managed in a thread-safe manner on purpose for performance.
if (_disposeCalled)
{
Dispose();
}
}
// Dispose call to implement IDisposable.
public void Dispose()
{
// Remember that Dispose was called.
_disposeCalled = true;
// Check if this object is in-use for an async socket operation.
if (Interlocked.CompareExchange(ref _operating, Disposed, Free) != Free)
{
// Either already disposed or will be disposed when current operation completes.
return;
}
// OK to dispose now.
FreeInternals();
// FileStreams may be created when using SendPacketsAsync - this Disposes them.
FinishOperationSendPackets();
// Don't bother finalizing later.
GC.SuppressFinalize(this);
}
~SocketAsyncEventArgs()
{
if (!Environment.HasShutdownStarted)
{
FreeInternals();
}
}
// NOTE: Use a try/finally to make sure Complete is called when you're done
private void StartConfiguring()
{
int status = Interlocked.CompareExchange(ref _operating, Configuring, Free);
if (status != Free)
{
ThrowForNonFreeStatus(status);
}
}
private void ThrowForNonFreeStatus(int status)
{
Debug.Assert(status == InProgress || status == Configuring || status == Disposed, $"Unexpected status: {status}");
ObjectDisposedException.ThrowIf(status == Disposed, this);
throw new InvalidOperationException(SR.net_socketopinprogress);
}
// Prepares for a native async socket call.
// This method performs the tasks common to all socket operations.
internal void StartOperationCommon(Socket? socket, SocketAsyncOperation operation)
{
// Change status to "in-use".
int status = Interlocked.CompareExchange(ref _operating, InProgress, Free);
if (status != Free)
{
ThrowForNonFreeStatus(status);
}
// Set the operation type and store the socket as current.
_completedOperation = operation;
_currentSocket = socket;
// Capture execution context if needed (it is unless explicitly disabled).
// If Telemetry is enabled, make sure to capture the context if we're making a Connect or Accept call to preserve the activity
if (_flowExecutionContext ||
(SocketsTelemetry.Log.IsEnabled() && (operation == SocketAsyncOperation.Connect || operation == SocketAsyncOperation.Accept)))
{
_context = ExecutionContext.Capture();
}
StartOperationCommonCore();
}
partial void StartOperationCommonCore();
internal void StartOperationAccept()
{
// AcceptEx needs a single buffer that's the size of two native sockaddr buffers with 16
// extra bytes each. It can also take additional buffer space in front of those special
// sockaddr structures that can be filled in with initial data coming in on a connection.
_acceptAddressBufferCount = 2 * (Socket.GetAddressSize(_currentSocket!._rightEndPoint!) + 16);
// If our caller specified a buffer (willing to get received data with the Accept) then
// it needs to be large enough for the two special sockaddr buffers that AcceptEx requires.
// Throw if that buffer is not large enough.
bool userSuppliedBuffer = !_buffer.Equals(default);
if (userSuppliedBuffer)
{
// Caller specified a buffer - see if it is large enough
if (_count < _acceptAddressBufferCount)
{
throw new ArgumentException(SR.net_buffercounttoosmall, nameof(Count));
}
}
else
{
// Caller didn't specify a buffer so use an internal one.
// See if current internal one is big enough, otherwise create a new one.
if (_acceptBuffer == null || _acceptBuffer.Length < _acceptAddressBufferCount)
{
_acceptBuffer = new byte[_acceptAddressBufferCount];
}
}
}
internal void StartOperationConnect(bool saeaMultiConnectCancelable, bool userSocket)
{
_multipleConnectCancellation = saeaMultiConnectCancelable ? new CancellationTokenSource() : null;
_connectSocket = null;
_userSocket = userSocket;
}
internal void CancelConnectAsync()
{
if (_operating == InProgress && _completedOperation == SocketAsyncOperation.Connect)
{
CancellationTokenSource? multipleConnectCancellation = _multipleConnectCancellation;
if (multipleConnectCancellation != null)
{
// If a multiple connect is in progress, abort it.
multipleConnectCancellation.Cancel();
}
else
{
// Otherwise we're doing a normal ConnectAsync - cancel it by closing the socket.
_currentSocket?.Dispose();
}
}
}
internal void FinishOperationSyncFailure(SocketError socketError, int bytesTransferred, SocketFlags flags)
{
SetResults(socketError, bytesTransferred, flags);
// This will be null if we're doing a static ConnectAsync to a DnsEndPoint with AddressFamily.Unspecified;
// the attempt socket will be closed anyways, so not updating the state is OK.
// If we're doing a static ConnectAsync to an IPEndPoint, we need to dispose
// of the socket, as we manufactured it and the caller has no opportunity to do so.
Socket? currentSocket = _currentSocket;
if (currentSocket != null)
{
currentSocket.UpdateStatusAfterSocketError(socketError);
if (_completedOperation == SocketAsyncOperation.Connect && !_userSocket)
{
currentSocket.Dispose();
_currentSocket = null;
}
}
switch (_completedOperation)
{
case SocketAsyncOperation.SendPackets:
// We potentially own FileStreams that need to be disposed.
FinishOperationSendPackets();
break;
}
// Don't log transferred byte count in case of a failure.
Complete();
}
internal void FinishOperationAsyncFailure(SocketError socketError, int bytesTransferred, SocketFlags flags)
{
ExecutionContext? context = _context; // store context before it's cleared as part of finishing the operation
FinishOperationSyncFailure(socketError, bytesTransferred, flags);
if (context == null)
{
OnCompletedInternal();
}
else
{
ExecutionContext.Run(context, s_executionCallback, this);
}
}
/// <summary>Performs an asynchronous connect involving a DNS lookup.</summary>
/// <param name="endPoint">The DNS end point to which to connect.</param>
/// <param name="socketType">The SocketType to use to construct new sockets, if necessary.</param>
/// <param name="protocolType">The ProtocolType to use to construct new sockets, if necessary.</param>
/// <returns>true if the operation is pending; otherwise, false if it's already completed.</returns>
internal bool DnsConnectAsync(DnsEndPoint endPoint, SocketType socketType, ProtocolType protocolType)
{
Debug.Assert(endPoint.AddressFamily == AddressFamily.Unspecified ||
endPoint.AddressFamily == AddressFamily.InterNetwork ||
endPoint.AddressFamily == AddressFamily.InterNetworkV6);
CancellationToken cancellationToken = _multipleConnectCancellation?.Token ?? default;
// In .NET 5 and earlier, the APM implementation allowed for synchronous exceptions from this to propagate
// synchronously. This call is made here rather than in the Core async method below to preserve that behavior.
Task<IPAddress[]> addressesTask = Dns.GetHostAddressesAsync(endPoint.Host, endPoint.AddressFamily, cancellationToken);
// Initialize the internal event args instance. It needs to be initialized with `this` instance's buffer
// so that it may be used as part of receives during a connect.
// TODO https://github.com/dotnet/runtime/issues/30252#issuecomment-511231055: Try to avoid this extra level of SAEA.
var internalArgs = new MultiConnectSocketAsyncEventArgs();
internalArgs.CopyBufferFrom(this);
// Delegate to the actual implementation. The returned Task is unused and ignored, as the whole body is surrounded
// by a try/catch. Thus we ignore the result. We avoid an "async void" method so as to skip the implicit SynchronizationContext
// interactions async void methods entail.
_ = Core(internalArgs, addressesTask, endPoint.Port, socketType, protocolType, cancellationToken);
// Determine whether the async operation already completed and stored the results into `this`.
// If we reached this point and the operation hasn't yet stored the results, then it's considered
// pending. If by the time we get here it has stored the results, it's considered completed.
// The callback won't invoke the Completed event if it gets there first.
return internalArgs.ReachedCoordinationPointFirst();
async Task Core(MultiConnectSocketAsyncEventArgs internalArgs, Task<IPAddress[]> addressesTask, int port, SocketType socketType, ProtocolType protocolType, CancellationToken cancellationToken)
{
Socket? tempSocketIPv4 = null, tempSocketIPv6 = null;
Exception? caughtException = null;
try
{
// Try each address in turn. We store the last error received, such that if we fail to connect to all addresses,
// we can use the last error to represent the entire operation.
SocketError lastError = SocketError.NoData;
foreach (IPAddress address in await addressesTask.ConfigureAwait(false))
{
Socket? attemptSocket = null;
if (_currentSocket != null)
{
// If this SocketAsyncEventArgs was configured with a socket, then use it.
// If that instance doesn't support this address, move on to the next.
if (!_currentSocket.CanTryAddressFamily(address.AddressFamily))
{
continue;
}
attemptSocket = _currentSocket;
}
else
{
// If this SocketAsyncEventArgs doesn't have a socket, then we need to create a temporary one, which we do
// based on this address' address family (and then reuse for subsequent addresses for the same family).
if (address.AddressFamily == AddressFamily.InterNetworkV6)
{
attemptSocket = tempSocketIPv6 ??= (Socket.OSSupportsIPv6 ? new Socket(AddressFamily.InterNetworkV6, socketType, protocolType) : null);
if (attemptSocket is not null && address.IsIPv4MappedToIPv6)
{
// We need a DualMode socket to connect to an IPv6-mapped IPv4 address.
attemptSocket.DualMode = true;
}
}
else if (address.AddressFamily == AddressFamily.InterNetwork)
{
attemptSocket = tempSocketIPv4 ??= (Socket.OSSupportsIPv4 ? new Socket(AddressFamily.InterNetwork, socketType, protocolType) : null);
}
// If we were unable to get a socket to use for this address, move on to the next address.
if (attemptSocket is null)
{
continue;
}
}
// Reset the socket if necessary to support another connect. This is necessary on Unix in particular where
// the same socket handle can't be used for another connect, so we swap in a new handle under the covers if
// possible. We do this not just for the 2nd+ address but also for the first in case the Socket was already
// used for a connection attempt outside of this call.
attemptSocket.ReplaceHandleIfNecessaryAfterFailedConnect();
// Reconfigure the internal event args for the new address.
if (internalArgs.RemoteEndPoint is IPEndPoint existing)
{
existing.Address = address;
Debug.Assert(existing.Port == port);
}
else
{
internalArgs.RemoteEndPoint = new IPEndPoint(address, port);
}
// Issue the connect. If it pends, wait for it to complete.
if (attemptSocket.ConnectAsync(internalArgs))
{
using (cancellationToken.UnsafeRegister(s => Socket.CancelConnectAsync((SocketAsyncEventArgs)s!), internalArgs))
{
await new ValueTask(internalArgs, internalArgs.Version).ConfigureAwait(false);
}
}
// If it completed successfully, we're done; cleanup will be handled by the finally.
if (internalArgs.SocketError == SocketError.Success)
{
return;
}
// If the operation was canceled, simulate the appropriate SocketError.
if (cancellationToken.IsCancellationRequested)
{
throw new SocketException((int)SocketError.OperationAborted);
}
lastError = internalArgs.SocketError;
internalArgs.Reset();
}
caughtException = new SocketException((int)lastError);
}
catch (ObjectDisposedException)
{
// This can happen if the user closes the socket and is equivalent to a call to CancelConnectAsync.
caughtException = new SocketException((int)SocketError.OperationAborted);
}
catch (Exception exc)
{
caughtException = exc;
}
finally
{
// Close the sockets as needed.
if (tempSocketIPv4 != null && !tempSocketIPv4.Connected)
{
tempSocketIPv4.Dispose();
}
if (tempSocketIPv6 != null && !tempSocketIPv6.Connected)
{
tempSocketIPv6.Dispose();
}
if (_currentSocket != null)
{
// If the caller-provided socket was a temporary and isn't connected now, or if the failed with an abortive exception,
// dispose of the socket.
if ((!_userSocket && !_currentSocket.Connected) ||
caughtException is OperationCanceledException ||
(caughtException is SocketException se && se.SocketErrorCode == SocketError.OperationAborted))
{
_currentSocket.Dispose();
}
}
// Store the results.
if (caughtException != null)
{
SetResults(caughtException, 0, SocketFlags.None);
_currentSocket?.UpdateStatusAfterSocketError(_socketError);
}
else
{
SetResults(SocketError.Success, internalArgs.BytesTransferred, internalArgs.SocketFlags);
_connectSocket = _currentSocket = internalArgs.ConnectSocket!;
}
// Complete the operation.
if (SocketsTelemetry.Log.IsEnabled()) LogBytesTransferEvents(_connectSocket?.SocketType, SocketAsyncOperation.Connect, internalArgs.BytesTransferred);
Complete();
// Clean up after our temporary arguments.
internalArgs.Dispose();
// If the caller is treating this operation as pending, own the completion.
if (!internalArgs.ReachedCoordinationPointFirst())
{
// Regardless of _flowExecutionContext, context will have been flown through this async method, as that's part
// of what async methods do. As such, we're already on whatever ExecutionContext is the right one to invoke
// the completion callback. This method may have even mutated the ExecutionContext, in which case for telemetry
// we need those mutations to be surfaced as part of this callback, so that logging performed here sees those
// mutations (e.g. to the current Activity).
OnCompleted(this);
}
}
}
}
private sealed class MultiConnectSocketAsyncEventArgs : SocketAsyncEventArgs, IValueTaskSource
{
private ManualResetValueTaskSourceCore<bool> _mrvtsc;
private int _isCompleted;
public MultiConnectSocketAsyncEventArgs() : base(unsafeSuppressExecutionContextFlow: false) { }
public void GetResult(short token) => _mrvtsc.GetResult(token);
public ValueTaskSourceStatus GetStatus(short token) => _mrvtsc.GetStatus(token);
public void OnCompleted(Action<object?> continuation, object? state, short token, ValueTaskSourceOnCompletedFlags flags) => _mrvtsc.OnCompleted(continuation, state, token, flags);
public short Version => _mrvtsc.Version;
public void Reset() => _mrvtsc.Reset();
protected override void OnCompleted(SocketAsyncEventArgs e) => _mrvtsc.SetResult(true);
public bool ReachedCoordinationPointFirst() => Interlocked.Exchange(ref _isCompleted, 1) == 0;
}
internal void FinishOperationSyncSuccess(int bytesTransferred, SocketFlags flags)
{
SetResults(SocketError.Success, bytesTransferred, flags);
if (NetEventSource.Log.IsEnabled() && bytesTransferred > 0)
{
LogBuffer(bytesTransferred);
}
SocketError socketError;
switch (_completedOperation)
{
case SocketAsyncOperation.Accept:
// Get the endpoint.
SocketAddress remoteSocketAddress = _currentSocket!._rightEndPoint!.Serialize();
socketError = FinishOperationAccept(remoteSocketAddress);
if (socketError == SocketError.Success)
{
_acceptSocket = _currentSocket.UpdateAcceptSocket(_acceptSocket!, _currentSocket._rightEndPoint!.Create(remoteSocketAddress));
if (NetEventSource.Log.IsEnabled())
{
try
{
NetEventSource.Accepted(_acceptSocket, _acceptSocket.RemoteEndPoint, _acceptSocket.LocalEndPoint);
}
catch (ObjectDisposedException) { }
}
}
else
{
SetResults(socketError, bytesTransferred, flags);
_acceptSocket = null;
_currentSocket.UpdateStatusAfterSocketError(socketError);
}
break;
case SocketAsyncOperation.Connect:
socketError = FinishOperationConnect();
if (socketError == SocketError.Success)
{
if (NetEventSource.Log.IsEnabled())
{
try
{
NetEventSource.Connected(_currentSocket!, _currentSocket!.LocalEndPoint, _currentSocket.RemoteEndPoint);
}
catch (ObjectDisposedException) { }
}
// Mark socket connected.
_currentSocket!.SetToConnected();
_connectSocket = _currentSocket;
}
else
{
SetResults(socketError, bytesTransferred, flags);
_currentSocket!.UpdateStatusAfterSocketError(socketError);
}
break;
case SocketAsyncOperation.Disconnect:
_currentSocket!.SetToDisconnected();
_currentSocket._remoteEndPoint = null;
break;
case SocketAsyncOperation.ReceiveFrom:
// Deal with incoming address.
UpdateReceivedSocketAddress(_socketAddress!);
if (_remoteEndPoint == null)
{
// detach user provided SA as it was updated in place.
_socketAddress = null;
}
else if (!SocketAddressExtensions.Equals(_socketAddress!, _remoteEndPoint))
{
try
{
if (_remoteEndPoint!.AddressFamily == AddressFamily.InterNetworkV6 && _socketAddress!.Family == AddressFamily.InterNetwork)
{
_remoteEndPoint = new IPEndPoint(_socketAddress.GetIPAddress().MapToIPv6(), _socketAddress.GetPort());
}
else
{
_remoteEndPoint = _remoteEndPoint!.Create(_socketAddress!);
}
}
catch
{
}
}
break;
case SocketAsyncOperation.ReceiveMessageFrom:
// Deal with incoming address.
UpdateReceivedSocketAddress(_socketAddress!);
if (!SocketAddressExtensions.Equals(_socketAddress!, _remoteEndPoint))
{
try
{
if (_remoteEndPoint!.AddressFamily == AddressFamily.InterNetworkV6 && _socketAddress!.Family == AddressFamily.InterNetwork)
{
_remoteEndPoint = new IPEndPoint(_socketAddress.GetIPAddress().MapToIPv6(), _socketAddress.GetPort());
}
else
{
_remoteEndPoint = _remoteEndPoint!.Create(_socketAddress!);
}
}
catch
{
}
}
FinishOperationReceiveMessageFrom();
break;
case SocketAsyncOperation.SendPackets:
FinishOperationSendPackets();
break;
}
if (SocketsTelemetry.Log.IsEnabled()) LogBytesTransferEvents(_currentSocket?.SocketType, _completedOperation, bytesTransferred);
Complete();
}
internal void FinishOperationAsyncSuccess(int bytesTransferred, SocketFlags flags)
{
ExecutionContext? context = _context; // store context before it's cleared as part of finishing the operation
FinishOperationSyncSuccess(bytesTransferred, flags);
// Raise completion event.
if (context == null)
{
OnCompletedInternal();
}
else
{
ExecutionContext.Run(context, s_executionCallback, this);
}
}
private void FinishOperationSync(SocketError socketError, int bytesTransferred, SocketFlags flags)
{
Debug.Assert(socketError != SocketError.IOPending);
if (socketError == SocketError.Success)
{
FinishOperationSyncSuccess(bytesTransferred, flags);
}
else
{
FinishOperationSyncFailure(socketError, bytesTransferred, flags);
}
// The following check checks if the operation was Accept (1) or Connect (2)
if (LastOperation <= SocketAsyncOperation.Connect)
{
AfterConnectAcceptTelemetry();
}
}
private static void LogBytesTransferEvents(SocketType? socketType, SocketAsyncOperation operation, int bytesTransferred)
{
switch (operation)
{
case SocketAsyncOperation.Receive:
case SocketAsyncOperation.ReceiveFrom:
case SocketAsyncOperation.ReceiveMessageFrom:
case SocketAsyncOperation.Accept:
SocketsTelemetry.Log.BytesReceived(bytesTransferred);
if (socketType == SocketType.Dgram) SocketsTelemetry.Log.DatagramReceived();
break;
case SocketAsyncOperation.Send:
case SocketAsyncOperation.SendTo:
case SocketAsyncOperation.SendPackets:
case SocketAsyncOperation.Connect:
SocketsTelemetry.Log.BytesSent(bytesTransferred);
if (socketType == SocketType.Dgram) SocketsTelemetry.Log.DatagramSent();
break;
}
}
}
}
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