// Disable CS0162: Unreachable code detected
//
// SuportsMultipleConnectAttempts is a constant; when false, the following lines will trigger CS0162.
#pragma warning disable 162, 429
private static object PostOneBeginConnect(MultipleAddressConnectAsyncResult context)
{
IPAddress currentAddressSnapshot = context._addresses[context._index];
if (!context._socket.CanTryAddressFamily(currentAddressSnapshot.AddressFamily))
{
return context._lastException != null ? context._lastException : new ArgumentException(SR.net_invalidAddressList, "context");
}
try
{
EndPoint endPoint = new IPEndPoint(currentAddressSnapshot, context._port);
// Do the necessary security demand.
context._socket.CheckCacheRemote(ref endPoint, true);
Socket connectSocket = context._socket;
if (!SocketPal.SupportsMultipleConnectAttempts && !context._isUserConnectAttempt)
{
context._lastAttemptSocket = new Socket(context._socket._addressFamily, context._socket._socketType, context._socket._protocolType);
if (context._socket.IsDualMode)
{
context._lastAttemptSocket.DualMode = true;
}
connectSocket = context._lastAttemptSocket;
}
IAsyncResult connectResult = connectSocket.UnsafeBeginConnect(endPoint, CachedMultipleAddressConnectCallback, context);
if (connectResult.CompletedSynchronously)
{
return connectResult;
}
}
catch (Exception exception)
{
if (exception is OutOfMemoryException)
{
throw;
}
return exception;
}
return null;
}
// This is like a regular async callback worker, except the result can be an exception. This is a useful pattern when
// processing should continue whether or not an async step failed.
private static bool DoMultipleAddressConnectCallback(object result, MultipleAddressConnectAsyncResult context)
{
while (result != null)
{
Exception ex = result as Exception;
if (ex == null)
{
try
{
if (SocketPal.SupportsMultipleConnectAttempts || context._isUserConnectAttempt)
{
context._socket.EndConnect((IAsyncResult)result);
}
else
{
Debug.Assert(context._lastAttemptSocket != null);
context._lastAttemptSocket.EndConnect((IAsyncResult)result);
}
}
catch (Exception exception)
{
ex = exception;
}
}
if (!SocketPal.SupportsMultipleConnectAttempts && !context._isUserConnectAttempt && context._lastAttemptSocket != null)
{
context._lastAttemptSocket.Dispose();
}
if (ex == null)
{
if (!SocketPal.SupportsMultipleConnectAttempts && !context._isUserConnectAttempt)
{
context._isUserConnectAttempt = true;
result = PostOneBeginConnect(context);
}
else
{
// Don't invoke the callback from here, because we're probably inside
// a catch-all block that would eat exceptions from the callback.
// Instead tell our caller to invoke the callback outside of its catchall.
return true;
}
}
else
{
if (++context._index >= context._addresses.Length || context._isUserConnectAttempt)
{
throw ex;
}
context._lastException = ex;
result = PostOneBeginConnect(context);
}
}
// Don't invoke the callback at all, because we've posted another async connection attempt.
return false;
}
internal IAsyncResult BeginConnect(IPAddress[] addresses, int port, AsyncCallback requestCallback, object state)
{
if (s_loggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "BeginConnect", addresses);
}
if (CleanedUp)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
if (addresses == null)
{
throw new ArgumentNullException("addresses");
}
if (addresses.Length == 0)
{
throw new ArgumentException(SR.net_invalidAddressList, "addresses");
}
if (!TcpValidationHelpers.ValidatePortNumber(port))
{
throw new ArgumentOutOfRangeException("port");
}
if (_addressFamily != AddressFamily.InterNetwork && _addressFamily != AddressFamily.InterNetworkV6)
{
throw new NotSupportedException(SR.net_invalidversion);
}
if (_isListening)
{
throw new InvalidOperationException(SR.net_sockets_mustnotlisten);
}
// Set up the result to capture the context. No need for a lock.
MultipleAddressConnectAsyncResult result = new MultipleAddressConnectAsyncResult(addresses, port, this, state, requestCallback);
result.StartPostingAsyncOp(false);
if (DoMultipleAddressConnectCallback(PostOneBeginConnect(result), result))
{
// If the call completes synchronously, invoke the callback from here.
result.InvokeCallback();
}
// Finished posting async op. Possibly will call callback.
result.FinishPostingAsyncOp(ref Caches.ConnectClosureCache);
if (s_loggingEnabled)
{
Logging.Exit(Logging.Sockets, this, "BeginConnect", result);
}
return result;
}
private static bool DoDnsCallback(IAsyncResult result, MultipleAddressConnectAsyncResult context)
{
IPAddress[] addresses = DnsAPMExtensions.EndGetHostAddresses(result);
context._addresses = addresses;
return DoMultipleAddressConnectCallback(PostOneBeginConnect(context), context);
}
// This is like a regular async callback worker, except the result can be an exception. This is a useful pattern when
// processing should continue whether or not an async step failed.
private static bool DoMultipleAddressConnectCallback(object result, MultipleAddressConnectAsyncResult context)
{
while (result != null)
{
Exception ex = result as Exception;
if (ex == null)
{
try
{
context.socket.EndConnect((IAsyncResult) result);
}
catch (Exception exception)
{
ex = exception;
}
}
if (ex == null)
{
// Don't invoke the callback from here, because we're probably inside
// a catch-all block that would eat exceptions from the callback.
// Instead tell our caller to invoke the callback outside of its catchall.
return true;
}
else
{
if (++context.index >= context.addresses.Length)
throw ex;
context.lastException = ex;
result = PostOneBeginConnect(context);
}
}
// Don't invoke the callback at all, because we've posted another async connection attempt
return false;
}
internal IAsyncResult BeginConnect(string host, int port, AsyncCallback requestCallback, object state)
{
if (s_loggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "BeginConnect", host);
}
if (CleanedUp)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
if (host == null)
{
throw new ArgumentNullException("host");
}
if (!TcpValidationHelpers.ValidatePortNumber(port))
{
throw new ArgumentOutOfRangeException("port");
}
if (_addressFamily != AddressFamily.InterNetwork && _addressFamily != AddressFamily.InterNetworkV6)
{
throw new NotSupportedException(SR.net_invalidversion);
}
if (_isListening)
{
throw new InvalidOperationException(SR.net_sockets_mustnotlisten);
}
// Here, want to flow the context. No need to lock.
MultipleAddressConnectAsyncResult result = new MultipleAddressConnectAsyncResult(null, port, this, state, requestCallback);
result.StartPostingAsyncOp(false);
IAsyncResult dnsResult = DnsAPMExtensions.BeginGetHostAddresses(host, new AsyncCallback(DnsCallback), result);
if (dnsResult.CompletedSynchronously)
{
if (DoDnsCallback(dnsResult, result))
{
result.InvokeCallback();
}
}
// Done posting.
result.FinishPostingAsyncOp(ref Caches.ConnectClosureCache);
if (s_loggingEnabled)
{
Logging.Exit(Logging.Sockets, this, "BeginConnect", result);
}
return result;
}
public IAsyncResult BeginConnect(string host, int port, AsyncCallback requestCallback, object state)
{
if (NetEventSource.IsEnabled) NetEventSource.Enter(this, host);
if (CleanedUp)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
if (host == null)
{
throw new ArgumentNullException(nameof(host));
}
if (!TcpValidationHelpers.ValidatePortNumber(port))
{
throw new ArgumentOutOfRangeException(nameof(port));
}
if (_addressFamily != AddressFamily.InterNetwork && _addressFamily != AddressFamily.InterNetworkV6)
{
throw new NotSupportedException(SR.net_invalidversion);
}
if (_isListening)
{
throw new InvalidOperationException(SR.net_sockets_mustnotlisten);
}
IPAddress parsedAddress;
if (IPAddress.TryParse(host, out parsedAddress))
{
IAsyncResult r = BeginConnect(parsedAddress, port, requestCallback, state);
if (NetEventSource.IsEnabled) NetEventSource.Exit(this, r);
return r;
}
ThrowIfNotSupportsMultipleConnectAttempts();
// Here, want to flow the context. No need to lock.
MultipleAddressConnectAsyncResult result = new MultipleAddressConnectAsyncResult(null, port, this, state, requestCallback);
result.StartPostingAsyncOp(false);
IAsyncResult dnsResult = DnsAPMExtensions.BeginGetHostAddresses(host, new AsyncCallback(DnsCallback), result);
if (dnsResult.CompletedSynchronously)
{
if (DoDnsCallback(dnsResult, result))
{
result.InvokeCallback();
}
}
// Done posting.
result.FinishPostingAsyncOp(ref Caches.ConnectClosureCache);
if (NetEventSource.IsEnabled) NetEventSource.Exit(this, result);
return result;
}
private static object PostOneBeginConnect(MultipleAddressConnectAsyncResult context)
{
IPAddress currentAddressSnapshot = context.addresses[context.index];
if (!context.socket.CanTryAddressFamily(currentAddressSnapshot.AddressFamily))
{
return context.lastException != null ? context.lastException : new ArgumentException(SR.GetString(SR.net_invalidAddressList), "context");
}
try
{
EndPoint endPoint = new IPEndPoint(currentAddressSnapshot, context.port);
// MSRC 11081 - Do the necessary security demand
context.socket.CheckCacheRemote(ref endPoint, true);
IAsyncResult connectResult = context.socket.UnsafeBeginConnect(endPoint,
new AsyncCallback(MultipleAddressConnectCallback), context);
if (connectResult.CompletedSynchronously)
{
return connectResult;
}
}
catch (Exception exception)
{
if (exception is OutOfMemoryException || exception is StackOverflowException || exception is ThreadAbortException)
throw;
return exception;
}
return null;
}
// This is like a regular async callback worker, except the result can be an exception. This is a useful pattern when
// processing should continue whether or not an async step failed.
private static void DoMultipleAddressConnectCallback(object result, MultipleAddressConnectAsyncResult context)
{
while (result != null)
{
Exception ex = result as Exception;
if (ex == null)
{
try
{
context.socket.EndConnect((IAsyncResult) result);
}
catch (Exception exception)
{
if (exception is ThreadAbortException || exception is StackOverflowException || exception is OutOfMemoryException)
throw;
ex = exception;
}
catch
{
ex = new Exception(SR.GetString(SR.net_nonClsCompliantException));
}
}
if (ex == null)
{
context.InvokeCallback();
break;
}
else
{
if (++context.index >= context.addresses.Length)
throw ex;
context.lastException = ex;
result = PostOneBeginConnect(context);
}
}
}
private static object PostOneBeginConnect(MultipleAddressConnectAsyncResult context)
{
if (context.addresses[context.index].AddressFamily != context.socket.AddressFamily)
{
return context.lastException != null ? context.lastException : new ArgumentException(SR.GetString(SR.net_invalidAddressList), "context");
}
try
{
IAsyncResult connectResult = context.socket.UnsafeBeginConnect(new IPEndPoint(context.addresses[context.index], context.port), new AsyncCallback(MultipleAddressConnectCallback), context);
if (connectResult.CompletedSynchronously)
{
return connectResult;
}
}
catch (Exception exception)
{
if (exception is OutOfMemoryException || exception is StackOverflowException || exception is ThreadAbortException)
throw;
return exception;
}
return null;
}
private static void DoDnsCallback(IAsyncResult result, MultipleAddressConnectAsyncResult context)
{
IPAddress[] addresses = Dns.EndGetHostAddresses(result);
context.addresses = addresses;
DoMultipleAddressConnectCallback(PostOneBeginConnect(context), context);
}
public IAsyncResult BeginConnect(IPAddress[] addresses, int port, AsyncCallback requestCallback, object state)
{
if (s_LoggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "BeginConnect", addresses);
}
if (this.CleanedUp)
{
throw new ObjectDisposedException(base.GetType().FullName);
}
if (addresses == null)
{
throw new ArgumentNullException("addresses");
}
if (addresses.Length == 0)
{
throw new ArgumentException(SR.GetString("net_invalidAddressList"), "addresses");
}
if (!ValidationHelper.ValidateTcpPort(port))
{
throw new ArgumentOutOfRangeException("port");
}
if ((this.addressFamily != System.Net.Sockets.AddressFamily.InterNetwork) && (this.addressFamily != System.Net.Sockets.AddressFamily.InterNetworkV6))
{
throw new NotSupportedException(SR.GetString("net_invalidversion"));
}
if (this.isListening)
{
throw new InvalidOperationException(SR.GetString("net_sockets_mustnotlisten"));
}
MultipleAddressConnectAsyncResult context = new MultipleAddressConnectAsyncResult(addresses, port, this, state, requestCallback);
context.StartPostingAsyncOp(false);
if (DoMultipleAddressConnectCallback(PostOneBeginConnect(context), context))
{
context.InvokeCallback();
}
context.FinishPostingAsyncOp(ref this.Caches.ConnectClosureCache);
if (s_LoggingEnabled)
{
Logging.Exit(Logging.Sockets, this, "BeginConnect", context);
}
return context;
}
public IAsyncResult BeginConnect(string host, int port, AsyncCallback requestCallback, object state)
{
if (s_LoggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "BeginConnect", host);
}
if (this.CleanedUp)
{
throw new ObjectDisposedException(base.GetType().FullName);
}
if (host == null)
{
throw new ArgumentNullException("host");
}
if (!ValidationHelper.ValidateTcpPort(port))
{
throw new ArgumentOutOfRangeException("port");
}
if ((this.addressFamily != System.Net.Sockets.AddressFamily.InterNetwork) && (this.addressFamily != System.Net.Sockets.AddressFamily.InterNetworkV6))
{
throw new NotSupportedException(SR.GetString("net_invalidversion"));
}
if (this.isListening)
{
throw new InvalidOperationException(SR.GetString("net_sockets_mustnotlisten"));
}
MultipleAddressConnectAsyncResult result = new MultipleAddressConnectAsyncResult(null, port, this, state, requestCallback);
result.StartPostingAsyncOp(false);
IAsyncResult result2 = Dns.UnsafeBeginGetHostAddresses(host, new AsyncCallback(Socket.DnsCallback), result);
if (result2.CompletedSynchronously && DoDnsCallback(result2, result))
{
result.InvokeCallback();
}
result.FinishPostingAsyncOp(ref this.Caches.ConnectClosureCache);
if (s_LoggingEnabled)
{
Logging.Exit(Logging.Sockets, this, "BeginConnect", result);
}
return result;
}
private static object PostOneBeginConnect(MultipleAddressConnectAsyncResult context)
{
IPAddress address = context.addresses[context.index];
if (address.AddressFamily != context.socket.AddressFamily)
{
if (context.lastException == null)
{
return new ArgumentException(SR.GetString("net_invalidAddressList"), "context");
}
return context.lastException;
}
try
{
EndPoint remoteEP = new IPEndPoint(address, context.port);
context.socket.CheckCacheRemote(ref remoteEP, true);
IAsyncResult result = context.socket.UnsafeBeginConnect(remoteEP, new AsyncCallback(Socket.MultipleAddressConnectCallback), context);
if (result.CompletedSynchronously)
{
return result;
}
}
catch (Exception exception)
{
if (((exception is OutOfMemoryException) || (exception is StackOverflowException)) || (exception is ThreadAbortException))
{
throw;
}
return exception;
}
return null;
}
private static bool DoMultipleAddressConnectCallback(object result, MultipleAddressConnectAsyncResult context)
{
while (result != null)
{
Exception exception = result as Exception;
if (exception == null)
{
try
{
context.socket.EndConnect((IAsyncResult) result);
}
catch (Exception exception2)
{
exception = exception2;
}
}
if (exception == null)
{
return true;
}
if (++context.index >= context.addresses.Length)
{
throw exception;
}
context.lastException = exception;
result = PostOneBeginConnect(context);
}
return false;
}