public static void WinHttpCallback(
IntPtr handle,
IntPtr context,
uint internetStatus,
IntPtr statusInformation,
uint statusInformationLength)
{
WinHttpTraceHelper.TraceCallbackStatus("WinHttpCallback", handle, context, internetStatus);
if (Environment.HasShutdownStarted)
{
WinHttpTraceHelper.Trace("WinHttpCallback: Environment.HasShutdownStarted returned True");
return;
}
if (context == IntPtr.Zero)
{
return;
}
WinHttpRequestState state = WinHttpRequestState.FromIntPtr(context);
Debug.Assert(state != null, "WinHttpCallback must have a non-null state object");
RequestCallback(handle, state, internetStatus, statusInformation, statusInformationLength);
}
public static void AddResponseCookiesToContainer(WinHttpRequestState state)
{
HttpRequestMessage request = state.RequestMessage;
SafeWinHttpHandle requestHandle = state.RequestHandle;
CookieContainer cookieContainer = state.Handler.CookieContainer;
Debug.Assert(state.Handler.CookieUsePolicy == CookieUsePolicy.UseSpecifiedCookieContainer);
Debug.Assert(cookieContainer != null);
// Get 'Set-Cookie' headers from response.
char[] buffer = null;
uint index = 0;
string cookieHeader;
WinHttpTraceHelper.Trace("WINHTTP_QUERY_SET_COOKIE");
while (WinHttpResponseParser.GetResponseHeader(
requestHandle, Interop.WinHttp.WINHTTP_QUERY_SET_COOKIE, ref buffer, ref index, out cookieHeader))
{
WinHttpTraceHelper.Trace(cookieHeader);
try
{
cookieContainer.SetCookies(request.RequestUri, cookieHeader);
WinHttpTraceHelper.Trace(cookieHeader);
}
catch (CookieException)
{
// We ignore malformed cookies in the response.
WinHttpTraceHelper.Trace("Ignoring invalid cookie: {0}", cookieHeader);
}
}
}
// The only way to abort pending async operations in WinHTTP is to close the request handle.
// This causes WinHTTP to cancel any pending I/O and accelerating its callbacks on the handle.
// This causes our related TaskCompletionSource objects to move to a terminal state.
//
// We only want to dispose the handle if we are actually waiting for a pending WinHTTP I/O to complete,
// meaning that we are await'ing for a Task to complete. While we could simply call dispose without
// a pending operation, it would cause random failures in the other threads when we expect a valid handle.
private void CancelPendingResponseStreamReadOperation()
{
WinHttpTraceHelper.Trace("WinHttpResponseStream.CancelPendingResponseStreamReadOperation");
lock (_state.Lock)
{
WinHttpTraceHelper.Trace(
string.Format("WinHttpResponseStream.CancelPendingResponseStreamReadOperation: {0} {1}",
(int)_state.TcsQueryDataAvailable.Task.Status, (int)_state.TcsReadFromResponseStream.Task.Status));
if (!_state.TcsQueryDataAvailable.Task.IsCompleted)
{
Debug.Assert(_requestHandle != null);
Debug.Assert(!_requestHandle.IsInvalid);
WinHttpTraceHelper.Trace("WinHttpResponseStream.CancelPendingResponseStreamReadOperation: before dispose");
_requestHandle.Dispose();
WinHttpTraceHelper.Trace("WinHttpResponseStream.CancelPendingResponseStreamReadOperation: after dispose");
}
}
}
private void Dispose(bool disposing)
{
#if DEBUG
Interlocked.Increment(ref s_dbg_callDispose);
#endif
if (WinHttpTraceHelper.IsTraceEnabled())
{
WinHttpTraceHelper.Trace(
"WinHttpRequestState.Dispose, GCHandle=0x{0:X}, disposed={1}, disposing={2}",
ToIntPtr(),
_disposed,
disposing);
}
// Since there is no finalizer and this class is sealed, the disposing parameter should be TRUE.
Debug.Assert(disposing, "WinHttpRequestState.Dispose() should have disposing=TRUE");
if (_disposed)
{
return;
}
_disposed = true;
if (_operationHandle.IsAllocated)
{
// This method only gets called when the WinHTTP request handle is fully closed and thus all
// async operations are done. So, it is safe at this point to unpin the buffers and release
// the strong GCHandle for this object.
if (_cachedReceivePinnedBuffer.IsAllocated)
{
_cachedReceivePinnedBuffer.Free();
_cachedReceivePinnedBuffer = default(GCHandle);
}
#if DEBUG
Interlocked.Increment(ref s_dbg_operationHandleFree);
#endif
_operationHandle.Free();
_operationHandle = default(GCHandle);
}
}
public WinInetProxyHelper()
{
var proxyConfig = new Interop.WinHttp.WINHTTP_CURRENT_USER_IE_PROXY_CONFIG();
try
{
if (Interop.WinHttp.WinHttpGetIEProxyConfigForCurrentUser(out proxyConfig))
{
AutoConfigUrl = Marshal.PtrToStringUni(proxyConfig.AutoConfigUrl);
AutoDetect = proxyConfig.AutoDetect;
Proxy = Marshal.PtrToStringUni(proxyConfig.Proxy);
ProxyBypass = Marshal.PtrToStringUni(proxyConfig.ProxyBypass);
WinHttpTraceHelper.Trace(
"WinInetProxyHelper.ctor: AutoConfigUrl={0}, AutoDetect={1}, Proxy={2}, ProxyBypass={3}",
AutoConfigUrl,
AutoDetect,
Proxy,
ProxyBypass);
_useProxy = true;
}
else
{
// We match behavior of WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY and ignore errors.
int lastError = Marshal.GetLastWin32Error();
WinHttpTraceHelper.Trace("WinInetProxyHelper.ctor: error={0}", lastError);
}
WinHttpTraceHelper.Trace("WinInetProxyHelper.ctor: _useProxy={0}", _useProxy);
}
finally
{
// FreeHGlobal already checks for null pointer before freeing the memory.
Marshal.FreeHGlobal(proxyConfig.AutoConfigUrl);
Marshal.FreeHGlobal(proxyConfig.Proxy);
Marshal.FreeHGlobal(proxyConfig.ProxyBypass);
}
}
public override Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken token)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count > buffer.Length - offset)
{
throw new ArgumentException("net_http_buffer_insufficient_length", nameof(buffer));
}
if (token.IsCancellationRequested)
{
return(Task.FromCanceled <int>(token));
}
CheckDisposed();
if (_state.TcsReadFromResponseStream != null && !_state.TcsReadFromResponseStream.Task.IsCompleted)
{
throw new InvalidOperationException("net_http_no_concurrent_io_allowed");
}
_state.PinReceiveBuffer(buffer);
_state.TcsReadFromResponseStream =
new TaskCompletionSource <int>(TaskCreationOptions.RunContinuationsAsynchronously);
_state.TcsQueryDataAvailable =
new TaskCompletionSource <int>(TaskCreationOptions.RunContinuationsAsynchronously);
_state.TcsQueryDataAvailable.Task.ContinueWith((previousTask) =>
{
if (previousTask.IsFaulted)
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(previousTask.Exception.InnerException);
}
else if (previousTask.IsCanceled || token.IsCancellationRequested)
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetCanceled(token);
}
else
{
int bytesToRead;
int bytesAvailable = previousTask.Result;
if (bytesAvailable > count)
{
bytesToRead = count;
}
else
{
bytesToRead = bytesAvailable;
}
lock (_state.Lock)
{
Debug.Assert(!_requestHandle.IsInvalid);
if (!Interop.WinHttp.WinHttpReadData(
_requestHandle,
Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset),
(uint)bytesToRead,
IntPtr.Zero))
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(
new IOException("net_http_io_read", WinHttpException.CreateExceptionUsingLastError()));
}
}
}
},
CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.Default);
// Register callback on cancellation token to cancel any pending WinHTTP operation.
if (token.CanBeCanceled)
{
WinHttpTraceHelper.Trace("WinHttpResponseStream.ReadAsync: registering for cancellation token request");
_state.CtrReadFromResponseStream =
token.Register(s => ((WinHttpResponseStream)s).CancelPendingResponseStreamReadOperation(), this);
}
else
{
WinHttpTraceHelper.Trace("WinHttpResponseStream.ReadAsync: received no cancellation token");
}
lock (_state.Lock)
{
Debug.Assert(!_requestHandle.IsInvalid);
if (!Interop.WinHttp.WinHttpQueryDataAvailable(_requestHandle, IntPtr.Zero))
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(
new IOException("net_http_io_read", WinHttpException.CreateExceptionUsingLastError()));
}
}
return(_state.TcsReadFromResponseStream.Task);
}
public void DisposeCtrReadFromResponseStream()
{
WinHttpTraceHelper.Trace("WinHttpRequestState.DisposeCtrReadFromResponseStream: disposing ctr");
CtrReadFromResponseStream.Dispose();
CtrReadFromResponseStream = default(CancellationTokenRegistration);
}
public bool GetProxyForUrl(
SafeWinHttpHandle sessionHandle,
Uri uri,
out Interop.WinHttp.WINHTTP_PROXY_INFO proxyInfo)
{
proxyInfo.AccessType = Interop.WinHttp.WINHTTP_ACCESS_TYPE_NO_PROXY;
proxyInfo.Proxy = IntPtr.Zero;
proxyInfo.ProxyBypass = IntPtr.Zero;
if (!_useProxy)
{
return(false);
}
bool useProxy = false;
Interop.WinHttp.WINHTTP_AUTOPROXY_OPTIONS autoProxyOptions;
autoProxyOptions.AutoConfigUrl = AutoConfigUrl;
autoProxyOptions.AutoDetectFlags = AutoDetect ?
(Interop.WinHttp.WINHTTP_AUTO_DETECT_TYPE_DHCP | Interop.WinHttp.WINHTTP_AUTO_DETECT_TYPE_DNS_A) : 0;
autoProxyOptions.AutoLoginIfChallenged = false;
autoProxyOptions.Flags =
(AutoDetect ? Interop.WinHttp.WINHTTP_AUTOPROXY_AUTO_DETECT : 0) |
(!string.IsNullOrEmpty(AutoConfigUrl) ? Interop.WinHttp.WINHTTP_AUTOPROXY_CONFIG_URL : 0);
autoProxyOptions.Reserved1 = IntPtr.Zero;
autoProxyOptions.Reserved2 = 0;
// AutoProxy Cache.
// http://msdn.microsoft.com/en-us/library/windows/desktop/aa383153(v=vs.85).aspx
// If the out-of-process service is active when WinHttpGetProxyForUrl is called, the cached autoproxy
// URL and script are available to the whole computer. However, if the out-of-process service is used,
// and the fAutoLogonIfChallenged flag in the pAutoProxyOptions structure is true, then the autoproxy
// URL and script are not cached. Therefore, calling WinHttpGetProxyForUrl with the fAutoLogonIfChallenged
// member set to TRUE results in additional overhead operations that may affect performance.
// The following steps can be used to improve performance:
// 1. Call WinHttpGetProxyForUrl with the fAutoLogonIfChallenged parameter set to false. The autoproxy
// URL and script are cached for future calls to WinHttpGetProxyForUrl.
// 2. If Step 1 fails, with ERROR_WINHTTP_LOGIN_FAILURE, then call WinHttpGetProxyForUrl with the
// fAutoLogonIfChallenged member set to TRUE.
//
// We match behavior of WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY and ignore errors.
var repeat = false;
do
{
if (Interop.WinHttp.WinHttpGetProxyForUrl(
sessionHandle,
uri.AbsoluteUri,
ref autoProxyOptions,
out proxyInfo))
{
WinHttpTraceHelper.Trace("WinInetProxyHelper.GetProxyForUrl: Using autoconfig proxy settings");
useProxy = true;
break;
}
else
{
var lastError = Marshal.GetLastWin32Error();
WinHttpTraceHelper.Trace("WinInetProxyHelper.GetProxyForUrl: error={0}", lastError);
if (lastError == Interop.WinHttp.ERROR_WINHTTP_LOGIN_FAILURE)
{
if (repeat)
{
// We don't retry more than once.
break;
}
else
{
repeat = true;
autoProxyOptions.AutoLoginIfChallenged = true;
}
}
else
{
break;
}
}
} while (repeat);
// Fall back to manual settings if available.
if (!useProxy && !string.IsNullOrEmpty(Proxy))
{
proxyInfo.AccessType = Interop.WinHttp.WINHTTP_ACCESS_TYPE_NAMED_PROXY;
proxyInfo.Proxy = Marshal.StringToHGlobalUni(Proxy);
proxyInfo.ProxyBypass = string.IsNullOrEmpty(ProxyBypass) ?
IntPtr.Zero : Marshal.StringToHGlobalUni(ProxyBypass);
WinHttpTraceHelper.Trace(
"WinInetProxyHelper.GetProxyForUrl: Fallback to Proxy={0}, ProxyBypass={1}",
Proxy,
ProxyBypass);
useProxy = true;
}
WinHttpTraceHelper.Trace("WinInetProxyHelper.GetProxyForUrl: useProxy={0}", useProxy);
return(useProxy);
}