//
// IWebProxy implementation
//
// Get proxies can never return null in the case of ExecutionSuccess.
private Uri GetProxyAuto(Uri destination, out AutoWebProxyState autoWebProxyState)
{
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::GetProxyAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null)
{
autoWebProxyState = AutoWebProxyState.Uninitialized;
return(null);
}
StringCollection proxies = ScriptEngine.GetProxies(destination, true, out autoWebProxyState);
if (autoWebProxyState != AutoWebProxyState.ExecutionSuccess)
{
return(null);
}
if (proxies.Count == 0)
{
// Null here means, no proxy available (incl. DIRECT), the request is prohibited.
return(null);
}
if (AreAllBypassed(proxies, true))
{
return(destination);
}
return(ProxyUri(proxies[0]));
}
internal Uri[] GetProxiesAuto(Uri destination, out AutoWebProxyState autoWebProxyState, ref int syncStatus)
{
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::GetProxiesAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null)
{
autoWebProxyState = AutoWebProxyState.Uninitialized;
return(null);
}
StringCollection proxies = ScriptEngine.GetProxies(destination, false, out autoWebProxyState, ref syncStatus);
if (autoWebProxyState != AutoWebProxyState.ExecutionSuccess)
{
return(null);
}
if (proxies.Count == 0)
{
return(new Uri[] { });
}
if (AreAllBypassed(proxies, false))
{
return(new Uri[] { null });
}
Uri[] proxyUris = new Uri[proxies.Count];
for (int i = 0; i < proxies.Count; i++)
{
proxyUris[i] = ProxyUri(proxies[i]);
}
return(proxyUris);
}
public bool GetAutoProxies(Uri destination, out IList <string>?proxyList)
{
proxyList = null;
if (session == null || session.IsInvalid || state == AutoWebProxyState.UnrecognizedScheme)
{
return(false);
}
string?proxyListString = null;
var errorCode = NativeMethods.WinHttp.ErrorCodes.AudodetectionFailed;
if (AutomaticallyDetectSettings && !autoDetectFailed)
{
errorCode = (NativeMethods.WinHttp.ErrorCodes)getAutoProxies(destination, null, out proxyListString);
autoDetectFailed = isErrorFatalForAutoDetect(errorCode);
if (errorCode == NativeMethods.WinHttp.ErrorCodes.UnrecognizedScheme)
{
state = AutoWebProxyState.UnrecognizedScheme;
return(false);
}
}
if (AutomaticConfigurationScript != null && isRecoverableAutoProxyError(errorCode))
{
errorCode = (NativeMethods.WinHttp.ErrorCodes)getAutoProxies(destination, AutomaticConfigurationScript,
out proxyListString);
}
state = getStateFromErrorCode(errorCode);
if (state != AutoWebProxyState.Completed)
{
return(false);
}
if (!string.IsNullOrEmpty(proxyListString))
{
proxyListString = removeWhitespaces(proxyListString !);
proxyList = proxyListString.Split(';');
}
return(true);
}
private bool IsBypassedAuto(Uri destination, out AutoWebProxyState autoWebProxyState)
{
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::IsBypassedAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null)
{
autoWebProxyState = AutoWebProxyState.Uninitialized;
return(true);
}
StringCollection proxies = ScriptEngine.GetProxies(destination, true, out autoWebProxyState);
if (autoWebProxyState != AutoWebProxyState.ExecutionSuccess)
{
return(true);
}
if (proxies.Count == 0)
{
return(false);
}
return(AreAllBypassed(proxies, true));
}
private void ExitLock(ref int syncStatus)
{
if (syncStatus != SyncStatus.Unlocked && syncStatus != SyncStatus.Aborted)
{
lock (this)
{
if (syncStatus == SyncStatus.RequestOwner)
{
m_LockedRequest = null;
}
m_LockHeld = false;
if (syncStatus == SyncStatus.AbortedLocked)
{
state = AutoWebProxyState.Uninitialized;
syncStatus = SyncStatus.Aborted;
}
else
{
syncStatus = SyncStatus.Unlocked;
}
Monitor.Pulse(this);
}
}
}
// Downloads and compiles the script from a given Uri.
// This code can be called by config for a downloaded control, we need to assert.
// This code is called holding the lock.
private AutoWebProxyState DownloadAndCompile(Uri location)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() location:" + ValidationHelper.ToString(location));
AutoWebProxyState newState = AutoWebProxyState.DownloadFailure;
WebResponse response = null;
TimerThread.Timer timer = null;
AutoWebProxyScriptWrapper newScriptInstance = null;
// Can't assert this in declarative form (DCR?). This Assert() is needed to be able to create the request to download the proxy script.
ExceptionHelper.WebPermissionUnrestricted.Assert();
try
{
lock (lockObject)
{
if (aborted)
{
throw new WebException(NetRes.GetWebStatusString("net_requestaborted",
WebExceptionStatus.RequestCanceled), WebExceptionStatus.RequestCanceled);
}
request = WebRequest.Create(location);
}
request.Timeout = Timeout.Infinite;
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.Default);
request.ConnectionGroupName = "__WebProxyScript";
// We have an opportunity here, if caching is disabled AppDomain-wide, to override it with a
// custom, trivial cache-provider to get a similar semantic.
//
// We also want to have a backup caching key in the case when IE has locked an expired script response
//
if (request.CacheProtocol != null)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Using backup caching.");
request.CacheProtocol = new RequestCacheProtocol(backupCache, request.CacheProtocol.Validator);
}
HttpWebRequest httpWebRequest = request as HttpWebRequest;
if (httpWebRequest != null)
{
httpWebRequest.Accept = "*/*";
httpWebRequest.UserAgent = this.GetType().FullName + "/" + Environment.Version;
httpWebRequest.KeepAlive = false;
httpWebRequest.Pipelined = false;
httpWebRequest.InternalConnectionGroup = true;
}
else
{
FtpWebRequest ftpWebRequest = request as FtpWebRequest;
if (ftpWebRequest != null)
{
ftpWebRequest.KeepAlive = false;
}
}
// Use no proxy, default cache - initiate the download.
request.Proxy = null;
request.Credentials = Engine.Credentials;
// Use our own timeout timer so that it can encompass the whole request, not just the headers.
if (timerQueue == null)
{
timerQueue = TimerThread.GetOrCreateQueue(SettingsSectionInternal.Section.DownloadTimeout);
}
timer = timerQueue.CreateTimer(timerCallback, request);
response = request.GetResponse();
// Check Last Modified.
DateTime lastModified = DateTime.MinValue;
HttpWebResponse httpResponse = response as HttpWebResponse;
if (httpResponse != null)
{
lastModified = httpResponse.LastModified;
}
else
{
FtpWebResponse ftpResponse = response as FtpWebResponse;
if (ftpResponse != null)
{
lastModified = ftpResponse.LastModified;
}
}
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() lastModified:" + lastModified.ToString() + " (script):" + (scriptInstance == null ? "(null)" : scriptInstance.LastModified.ToString()));
if (scriptInstance != null && lastModified != DateTime.MinValue && scriptInstance.LastModified == lastModified)
{
newScriptInstance = scriptInstance;
newState = AutoWebProxyState.Completed;
}
else
{
string scriptBody = null;
byte[] scriptBuffer = null;
using (Stream responseStream = response.GetResponseStream())
{
SingleItemRequestCache.ReadOnlyStream ros = responseStream as SingleItemRequestCache.ReadOnlyStream;
if (ros != null)
{
scriptBuffer = ros.Buffer;
}
if (scriptInstance != null && scriptBuffer != null && scriptBuffer == scriptInstance.Buffer)
{
scriptInstance.LastModified = lastModified;
newScriptInstance = scriptInstance;
newState = AutoWebProxyState.Completed;
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Buffer matched - reusing Engine.");
}
else
{
using (StreamReader streamReader = new StreamReader(responseStream))
{
scriptBody = streamReader.ReadToEnd();
}
}
}
WebResponse tempResponse = response;
response = null;
tempResponse.Close();
timer.Cancel();
timer = null;
if (newState != AutoWebProxyState.Completed)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() IsFromCache:" + tempResponse.IsFromCache.ToString() + " scriptInstance:" + ValidationHelper.HashString(scriptInstance));
if (scriptInstance != null && scriptBody == scriptInstance.ScriptBody)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Script matched - using existing Engine.");
scriptInstance.LastModified = lastModified;
if (scriptBuffer != null)
{
scriptInstance.Buffer = scriptBuffer;
}
newScriptInstance = scriptInstance;
newState = AutoWebProxyState.Completed;
}
else
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Creating AutoWebProxyScriptWrapper.");
newScriptInstance = new AutoWebProxyScriptWrapper();
newScriptInstance.LastModified = lastModified;
if (newScriptInstance.Compile(location, scriptBody, scriptBuffer))
{
newState = AutoWebProxyState.Completed;
}
else
{
newState = AutoWebProxyState.CompilationFailure;
}
}
}
}
}
catch (Exception exception)
{
if (Logging.On)
{
Logging.PrintWarning(Logging.Web, SR.GetString(SR.net_log_proxy_script_download_compile_error, exception));
}
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() Download() threw:" + ValidationHelper.ToString(exception));
}
finally
{
if (timer != null)
{
timer.Cancel();
}
//
try
{
if (response != null)
{
response.Close();
}
}
finally
{
WebPermission.RevertAssert();
// The request is not needed anymore. Set it to null, so if Abort() gets called,
// after this point, it will result in a no-op.
request = null;
}
}
if ((newState == AutoWebProxyState.Completed) && (scriptInstance != newScriptInstance))
{
if (scriptInstance != null)
{
scriptInstance.Close();
}
scriptInstance = newScriptInstance;
}
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::DownloadAndCompile() retuning newState:" + ValidationHelper.ToString(newState));
return(newState);
}
// Ensures that (if state is AutoWebProxyState.CompilationSuccess) there is an engine available to execute script.
// Figures out the script location (might discover if needed).
// Calls DownloadAndCompile().
private void EnsureEngineAvailable()
{
GlobalLog.Enter("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable");
if (State == AutoWebProxyState.Uninitialized || engineScriptLocation == null)
{
#if !FEATURE_PAL
if (Engine.AutomaticallyDetectSettings)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() Attempting auto-detection.");
DetectScriptLocation();
if (scriptLocation != null)
{
//
// Successfully detected or user has flipped the automaticallyDetectSettings bit.
// Attempt a non conclusive DownloadAndCompile() so we can fallback
//
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() discovered:" + ValidationHelper.ToString(scriptLocation) + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
if (scriptLocation.Equals(engineScriptLocation))
{
State = AutoWebProxyState.Completed;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
AutoWebProxyState newState = DownloadAndCompile(scriptLocation);
if (newState == AutoWebProxyState.Completed)
{
State = AutoWebProxyState.Completed;
engineScriptLocation = scriptLocation;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
}
}
#endif // !FEATURE_PAL
// Either Auto-Detect wasn't enabled or something failed with it. Try the manual script location.
if ((Engine.AutomaticConfigurationScript != null) && !aborted)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() using automaticConfigurationScript:" + ValidationHelper.ToString(Engine.AutomaticConfigurationScript) + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
if (Engine.AutomaticConfigurationScript.Equals(engineScriptLocation))
{
State = AutoWebProxyState.Completed;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
State = DownloadAndCompile(Engine.AutomaticConfigurationScript);
if (State == AutoWebProxyState.Completed)
{
engineScriptLocation = Engine.AutomaticConfigurationScript;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
}
}
else
{
// We always want to call DownloadAndCompile to check the expiration.
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() State:" + State + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
State = DownloadAndCompile(engineScriptLocation);
if (State == AutoWebProxyState.Completed)
{
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
// There's still an opportunity to fail over to the automaticConfigurationScript.
if (!engineScriptLocation.Equals(Engine.AutomaticConfigurationScript) && !aborted)
{
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() Update failed. Falling back to automaticConfigurationScript:" + ValidationHelper.ToString(Engine.AutomaticConfigurationScript));
State = DownloadAndCompile(Engine.AutomaticConfigurationScript);
if (State == AutoWebProxyState.Completed)
{
engineScriptLocation = Engine.AutomaticConfigurationScript;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
return;
}
}
}
// Everything failed. Set this instance to mostly-dead. It will wake up again if there's a reg/connectoid change.
GlobalLog.Print("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() All failed.");
State = AutoWebProxyState.DiscoveryFailure;
if (scriptInstance != null)
{
scriptInstance.Close();
scriptInstance = null;
}
engineScriptLocation = null;
GlobalLog.Leave("NetWebProxyFinder#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(State));
}
/// <devdoc>
/// <para>
/// Ensures that (if state is AutoWebProxyState.CompilationSuccess) there is an engine available to execute script.
/// Figures out the script location (might discover if needed).
/// Calls DownloadAndCompile().
/// </para>
/// </devdoc>
private AutoWebProxyState EnsureEngineAvailable(ref int syncStatus)
{
GlobalLog.Enter("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable");
AutoWebProxyScriptWrapper newScriptInstance;
if (state == AutoWebProxyState.Uninitialized || engineScriptLocation == null)
{
// Either Auto-Detect wasn't enabled or something failed with it. Try the manual script location.
if (automaticConfigurationScript != null)
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() using automaticConfigurationScript:" + ValidationHelper.ToString(automaticConfigurationScript) + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
state = AutoWebProxyState.DiscoverySuccess;
if (automaticConfigurationScript.Equals(engineScriptLocation))
{
state = AutoWebProxyState.CompilationSuccess;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return state;
}
state = DownloadAndCompile(automaticConfigurationScript, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
engineScriptLocation = automaticConfigurationScript;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return state;
}
}
}
else
{
// We always want to call DownloadAndCompile to check the expiration.
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() state:" + state + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
state = AutoWebProxyState.DiscoverySuccess;
state = DownloadAndCompile(engineScriptLocation, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return state;
}
// There's still an opportunity to fail over to the automaticConfigurationScript.
if (!engineScriptLocation.Equals(automaticConfigurationScript))
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() Update failed. Falling back to automaticConfigurationScript:" + ValidationHelper.ToString(automaticConfigurationScript));
state = AutoWebProxyState.DiscoverySuccess;
state = DownloadAndCompile(automaticConfigurationScript, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
engineScriptLocation = automaticConfigurationScript;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return state;
}
}
}
// Everything failed. Set this instance to mostly-dead. It will wake up again if there's a reg/connectoid change.
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() All failed.");
state = AutoWebProxyState.DiscoveryFailure;
UpdateScriptInstance(null);
engineScriptLocation = null;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return state;
}
internal StringCollection GetProxies(Uri destination, bool returnFirstOnly, out AutoWebProxyState autoWebProxyState, ref int syncStatus)
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() state:" + ValidationHelper.ToString(state));
if (state==AutoWebProxyState.DiscoveryFailure) {
// No engine will be available anyway, shortcut the call.
autoWebProxyState = state;
return null;
}
// This whole thing has to be locked, both to prevent simultaneous downloading / compilation, and
// because the script isn't threadsafe.
string scriptReturn = null;
try
{
EnterLock(ref syncStatus);
if (syncStatus != SyncStatus.LockOwner)
{
// This is typically because a download got aborted.
autoWebProxyState = AutoWebProxyState.DownloadFailure;
return null;
}
autoWebProxyState = EnsureEngineAvailable(ref syncStatus);
if (autoWebProxyState != AutoWebProxyState.CompilationSuccess)
{
// the script can't run, say we're not ready and bypass
return null;
}
autoWebProxyState = AutoWebProxyState.ExecutionFailure;
try {
scriptReturn = scriptInstance.FindProxyForURL(destination.ToString(), destination.Host);
autoWebProxyState = AutoWebProxyState.ExecutionSuccess;
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() calling ExecuteFindProxyForURL() for destination:" + ValidationHelper.ToString(destination) + " returned scriptReturn:" + ValidationHelper.ToString(scriptReturn));
}
catch (Exception exception) {
if (NclUtilities.IsFatal(exception)) throw;
if(Logging.On)Logging.PrintWarning(Logging.Web, SR.GetString(SR.net_log_proxy_script_execution_error, exception));
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() calling ExecuteFindProxyForURL() for destination:" + ValidationHelper.ToString(destination) + " threw:" + ValidationHelper.ToString(exception));
}
}
finally
{
ExitLock(ref syncStatus);
}
if (autoWebProxyState==AutoWebProxyState.ExecutionFailure) {
// the script failed at runtime, say we're not ready and bypass
return null;
}
StringCollection proxies = ParseScriptReturn(scriptReturn, destination, returnFirstOnly);
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() proxies:" + ValidationHelper.ToString(proxies));
return proxies;
}
internal StringCollection GetProxies(Uri destination, bool returnFirstOnly, out AutoWebProxyState autoWebProxyState)
{
int syncStatus = SyncStatus.Unlocked;
return GetProxies(destination, returnFirstOnly, out autoWebProxyState, ref syncStatus);
}
private void ExitLock(ref int syncStatus)
{
if (syncStatus != SyncStatus.Unlocked && syncStatus != SyncStatus.Aborted)
{
lock (this)
{
if (syncStatus == SyncStatus.RequestOwner)
{
m_LockedRequest = null;
}
m_LockHeld = false;
if (syncStatus == SyncStatus.AbortedLocked)
{
state = AutoWebProxyState.Uninitialized;
syncStatus = SyncStatus.Aborted;
}
else
{
syncStatus = SyncStatus.Unlocked;
}
Monitor.Pulse(this);
}
}
}
private bool IsBypassedAuto(Uri destination, out AutoWebProxyState autoWebProxyState) {
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::IsBypassedAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null) {
autoWebProxyState = AutoWebProxyState.Uninitialized;
return true;
}
StringCollection proxies = ScriptEngine.GetProxies(destination, true, out autoWebProxyState);
if (autoWebProxyState!=AutoWebProxyState.ExecutionSuccess) {
return true;
}
if (proxies.Count == 0)
{
return false;
}
return AreAllBypassed(proxies, true);
}
/// <devdoc>
/// <para>
/// Ensures that (if state is AutoWebProxyState.CompilationSuccess) there is an engine available to execute script.
/// Figures out the script location (might discover if needed).
/// Calls DownloadAndCompile().
/// </para>
/// </devdoc>
private AutoWebProxyState EnsureEngineAvailable(ref int syncStatus)
{
GlobalLog.Enter("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable");
AutoWebProxyScriptWrapper newScriptInstance;
if (state == AutoWebProxyState.Uninitialized || engineScriptLocation == null)
{
// Either Auto-Detect wasn't enabled or something failed with it. Try the manual script location.
if (automaticConfigurationScript != null)
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() using automaticConfigurationScript:" + ValidationHelper.ToString(automaticConfigurationScript) + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
state = AutoWebProxyState.DiscoverySuccess;
if (automaticConfigurationScript.Equals(engineScriptLocation))
{
state = AutoWebProxyState.CompilationSuccess;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return(state);
}
state = DownloadAndCompile(automaticConfigurationScript, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
engineScriptLocation = automaticConfigurationScript;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return(state);
}
}
}
else
{
// We always want to call DownloadAndCompile to check the expiration.
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() state:" + state + " engineScriptLocation:" + ValidationHelper.ToString(engineScriptLocation));
state = AutoWebProxyState.DiscoverySuccess;
state = DownloadAndCompile(engineScriptLocation, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return(state);
}
// There's still an opportunity to fail over to the automaticConfigurationScript.
if (!engineScriptLocation.Equals(automaticConfigurationScript))
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() Update failed. Falling back to automaticConfigurationScript:" + ValidationHelper.ToString(automaticConfigurationScript));
state = AutoWebProxyState.DiscoverySuccess;
state = DownloadAndCompile(automaticConfigurationScript, out newScriptInstance, ref syncStatus);
if (state == AutoWebProxyState.CompilationSuccess)
{
UpdateScriptInstance(newScriptInstance);
engineScriptLocation = automaticConfigurationScript;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return(state);
}
}
}
// Everything failed. Set this instance to mostly-dead. It will wake up again if there's a reg/connectoid change.
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable() All failed.");
state = AutoWebProxyState.DiscoveryFailure;
UpdateScriptInstance(null);
engineScriptLocation = null;
GlobalLog.Leave("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::EnsureEngineAvailable", ValidationHelper.ToString(state));
return(state);
}
internal StringCollection GetProxies(Uri destination, bool returnFirstOnly, out AutoWebProxyState autoWebProxyState, ref int syncStatus)
{
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() state:" + ValidationHelper.ToString(state));
if (state == AutoWebProxyState.DiscoveryFailure)
{
// No engine will be available anyway, shortcut the call.
autoWebProxyState = state;
return(null);
}
// This whole thing has to be locked, both to prevent simultaneous downloading / compilation, and
// because the script isn't threadsafe.
string scriptReturn = null;
try
{
EnterLock(ref syncStatus);
if (syncStatus != SyncStatus.LockOwner)
{
// This is typically because a download got aborted.
autoWebProxyState = AutoWebProxyState.DownloadFailure;
return(null);
}
autoWebProxyState = EnsureEngineAvailable(ref syncStatus);
if (autoWebProxyState != AutoWebProxyState.CompilationSuccess)
{
// the script can't run, say we're not ready and bypass
return(null);
}
autoWebProxyState = AutoWebProxyState.ExecutionFailure;
try {
scriptReturn = scriptInstance.FindProxyForURL(destination.ToString(), destination.Host);
autoWebProxyState = AutoWebProxyState.ExecutionSuccess;
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() calling ExecuteFindProxyForURL() for destination:" + ValidationHelper.ToString(destination) + " returned scriptReturn:" + ValidationHelper.ToString(scriptReturn));
}
catch (Exception exception) {
if (NclUtilities.IsFatal(exception))
{
throw;
}
if (Logging.On)
{
Logging.PrintWarning(Logging.Web, SR.GetString(SR.net_log_proxy_script_execution_error, exception));
}
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() calling ExecuteFindProxyForURL() for destination:" + ValidationHelper.ToString(destination) + " threw:" + ValidationHelper.ToString(exception));
}
}
finally
{
ExitLock(ref syncStatus);
}
if (autoWebProxyState == AutoWebProxyState.ExecutionFailure)
{
// the script failed at runtime, say we're not ready and bypass
return(null);
}
StringCollection proxies = ParseScriptReturn(scriptReturn, destination, returnFirstOnly);
GlobalLog.Print("AutoWebProxyScriptEngine#" + ValidationHelper.HashString(this) + "::GetProxies() proxies:" + ValidationHelper.ToString(proxies));
return(proxies);
}
internal StringCollection GetProxies(Uri destination, bool returnFirstOnly, out AutoWebProxyState autoWebProxyState)
{
int syncStatus = SyncStatus.Unlocked;
return(GetProxies(destination, returnFirstOnly, out autoWebProxyState, ref syncStatus));
}
internal Uri[] GetProxiesAuto(Uri destination, out AutoWebProxyState autoWebProxyState, ref int syncStatus)
{
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::GetProxiesAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null) {
autoWebProxyState = AutoWebProxyState.Uninitialized;
return null;
}
StringCollection proxies = ScriptEngine.GetProxies(destination, false, out autoWebProxyState, ref syncStatus);
if (autoWebProxyState!=AutoWebProxyState.ExecutionSuccess) {
return null;
}
if (proxies.Count == 0)
{
return new Uri[] { };
}
if (AreAllBypassed(proxies, false))
{
return new Uri[] { null };
}
Uri[] proxyUris = new Uri[proxies.Count];
for (int i=0; i<proxies.Count; i++) {
proxyUris[i] = ProxyUri(proxies[i]);
}
return proxyUris;
}
public void Reset()
{
state = AutoWebProxyState.Uninitialized;
autoDetectFailed = false;
}
//
// IWebProxy implementation
//
// Get proxies can never return null in the case of ExecutionSuccess.
private Uri GetProxyAuto(Uri destination, out AutoWebProxyState autoWebProxyState) {
GlobalLog.Print("WebProxy#" + ValidationHelper.HashString(this) + "::GetProxyAuto() destination:" + ValidationHelper.ToString(destination));
if (ScriptEngine == null) {
autoWebProxyState = AutoWebProxyState.Uninitialized;
return null;
}
StringCollection proxies = ScriptEngine.GetProxies(destination, true, out autoWebProxyState);
if (autoWebProxyState!=AutoWebProxyState.ExecutionSuccess) {
return null;
}
if (proxies.Count == 0)
{
// Null here means, no proxy available (incl. DIRECT), the request is prohibited.
return null;
}
if (AreAllBypassed(proxies, true)) {
return destination;
}
return ProxyUri(proxies[0]);
}
