コード例 #1
0
        public Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, bool doRequestAuth, CancellationToken cancellationToken)
        {
            if (_proxy == null)
            {
                return(SendAsyncCore(request, null, doRequestAuth, isProxyConnect: false, cancellationToken));
            }

            // Do proxy lookup.
            Uri?proxyUri = null;

            try
            {
                Debug.Assert(request.RequestUri != null);
                if (!_proxy.IsBypassed(request.RequestUri))
                {
                    if (_proxy is IMultiWebProxy multiWebProxy)
                    {
                        MultiProxy multiProxy = multiWebProxy.GetMultiProxy(request.RequestUri);

                        if (multiProxy.ReadNext(out proxyUri, out bool isFinalProxy) && !isFinalProxy)
                        {
                            return(SendAsyncMultiProxy(request, doRequestAuth, multiProxy, proxyUri, cancellationToken));
                        }
                    }
                    else
                    {
                        proxyUri = _proxy.GetProxy(request.RequestUri);
                    }
                }
            }
            catch (Exception ex)
            {
                // Eat any exception from the IWebProxy and just treat it as no proxy.
                // This matches the behavior of other handlers.
                if (NetEventSource.IsEnabled)
                {
                    NetEventSource.Error(this, $"Exception from {_proxy.GetType().Name}.GetProxy({request.RequestUri}): {ex}");
                }
            }

            if (proxyUri != null && proxyUri.Scheme != UriScheme.Http)
            {
                throw new NotSupportedException(SR.net_http_invalid_proxy_scheme);
            }

            return(SendAsyncCore(request, proxyUri, doRequestAuth, isProxyConnect: false, cancellationToken));
        }
コード例 #2
0
ファイル: HttpWindowsProxy.cs プロジェクト: z77ma/runtime
        private HttpWindowsProxy(WinInetProxyHelper proxyHelper, SafeWinHttpHandle?sessionHandle)
        {
            _proxyHelper   = proxyHelper;
            _sessionHandle = sessionHandle;

            if (proxyHelper.ManualSettingsUsed)
            {
                if (NetEventSource.Log.IsEnabled())
                {
                    NetEventSource.Info(proxyHelper, $"ManualSettingsUsed, {proxyHelper.Proxy}");
                }

                _secureProxy   = MultiProxy.Parse(_failedProxies, proxyHelper.Proxy, true);
                _insecureProxy = MultiProxy.Parse(_failedProxies, proxyHelper.Proxy, false);

                if (!string.IsNullOrWhiteSpace(proxyHelper.ProxyBypass))
                {
                    int    idx = 0;
                    string?tmp;

                    // Process bypass list for manual setting.
                    // Initial list size is best guess based on string length assuming each entry is at least 5 characters on average.
                    _bypass = new List <string>(proxyHelper.ProxyBypass.Length / 5);

                    while (idx < proxyHelper.ProxyBypass.Length)
                    {
                        // Strip leading spaces and scheme if any.
                        while (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] == ' ')
                        {
                            idx += 1;
                        }
                        ;
                        if (string.Compare(proxyHelper.ProxyBypass, idx, "http://", 0, 7, StringComparison.OrdinalIgnoreCase) == 0)
                        {
                            idx += 7;
                        }
                        else if (string.Compare(proxyHelper.ProxyBypass, idx, "https://", 0, 8, StringComparison.OrdinalIgnoreCase) == 0)
                        {
                            idx += 8;
                        }

                        if (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] == '[')
                        {
                            // Strip [] from IPv6 so we can use IdnHost laster for matching.
                            idx += 1;
                        }

                        int start = idx;
                        while (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] != ' ' && proxyHelper.ProxyBypass[idx] != ';' && proxyHelper.ProxyBypass[idx] != ']')
                        {
                            idx += 1;
                        }
                        ;

                        if (idx == start)
                        {
                            // Empty string.
                            tmp = null;
                        }
                        else if (string.Compare(proxyHelper.ProxyBypass, start, "<local>", 0, 7, StringComparison.OrdinalIgnoreCase) == 0)
                        {
                            _bypassLocal = true;
                            tmp          = null;
                        }
                        else
                        {
                            tmp = proxyHelper.ProxyBypass.Substring(start, idx - start);
                        }

                        // Skip trailing characters if any.
                        if (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] != ';')
                        {
                            // Got stopped at space or ']'. Strip until next ';' or end.
                            while (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] != ';')
                            {
                                idx += 1;
                            }
                            ;
                        }
                        if (idx < proxyHelper.ProxyBypass.Length && proxyHelper.ProxyBypass[idx] == ';')
                        {
                            idx++;
                        }
                        if (tmp == null)
                        {
                            continue;
                        }

                        _bypass.Add(tmp);
                    }
                    if (_bypass.Count == 0)
                    {
                        // Bypass string only had garbage we did not parse.
                        _bypass = null;
                    }
                }

                if (_bypassLocal)
                {
                    _localIp = new List <IPAddress>();
                    foreach (NetworkInterface netInterface in NetworkInterface.GetAllNetworkInterfaces())
                    {
                        IPInterfaceProperties ipProps = netInterface.GetIPProperties();
                        foreach (UnicastIPAddressInformation addr in ipProps.UnicastAddresses)
                        {
                            _localIp.Add(addr.Address);
                        }
                    }
                }
            }
        }
コード例 #3
0
ファイル: HttpWindowsProxy.cs プロジェクト: z77ma/runtime
        /// <summary>
        /// Gets the proxy URIs.
        /// </summary>
        public MultiProxy GetMultiProxy(Uri uri)
        {
            // We need WinHTTP to detect and/or process a PAC (JavaScript) file. This maps to
            // "Automatically detect settings" and/or "Use automatic configuration script" from IE
            // settings. But, calling into WinHTTP can be slow especially when it has to call into
            // the out-of-process service to discover, load, and run the PAC file. So, we skip
            // calling into WinHTTP if there was a recent failure to detect a PAC file on the network.
            // This is a common error. The default IE settings on a Windows machine consist of the
            // single checkbox for "Automatically detect settings" turned on and most networks
            // won't actually discover a PAC file on the network since WPAD protocol isn't configured.
            if (_proxyHelper.AutoSettingsUsed && !_proxyHelper.RecentAutoDetectionFailure)
            {
                Interop.WinHttp.WINHTTP_PROXY_INFO proxyInfo = default;
                try
                {
                    if (_proxyHelper.GetProxyForUrl(_sessionHandle, uri, out proxyInfo))
                    {
                        // If WinHTTP just specified a Proxy with no ProxyBypass list, then
                        // we can return the Proxy uri directly.
                        if (proxyInfo.ProxyBypass == IntPtr.Zero)
                        {
                            if (proxyInfo.Proxy != IntPtr.Zero)
                            {
                                string proxyStr = Marshal.PtrToStringUni(proxyInfo.Proxy) !;

                                return(MultiProxy.CreateLazy(_failedProxies, proxyStr, IsSecureUri(uri)));
                            }
                            else
                            {
                                return(MultiProxy.Empty);
                            }
                        }

                        // A bypass list was also specified. This means that WinHTTP has fallen back to
                        // using the manual IE settings specified and there is a ProxyBypass list also.
                        // Since we're not really using the full WinHTTP stack, we need to use HttpSystemProxy
                        // to do the computation of the final proxy uri merging the information from the Proxy
                        // and ProxyBypass strings.
                    }
                    else
                    {
                        return(MultiProxy.Empty);
                    }
                }
                finally
                {
                    Marshal.FreeHGlobal(proxyInfo.Proxy);
                    Marshal.FreeHGlobal(proxyInfo.ProxyBypass);
                }
            }

            // Fallback to manual settings if present.
            if (_proxyHelper.ManualSettingsUsed)
            {
                if (_bypassLocal)
                {
                    IPAddress?address;

                    if (uri.IsLoopback)
                    {
                        // This is optimization for loopback addresses.
                        // Unfortunately this does not work for all local addresses.
                        return(MultiProxy.Empty);
                    }

                    // Pre-Check if host may be IP address to avoid parsing.
                    if (uri.HostNameType == UriHostNameType.IPv6 || uri.HostNameType == UriHostNameType.IPv4)
                    {
                        // RFC1123 allows labels to start with number.
                        // Leading number may or may not be IP address.
                        // IPv6 [::1] notation. '[' is not valid character in names.
                        if (IPAddress.TryParse(uri.IdnHost, out address))
                        {
                            // Host is valid IP address.
                            // Check if it belongs to local system.
                            foreach (IPAddress a in _localIp !)
                            {
                                if (a.Equals(address))
                                {
                                    return(MultiProxy.Empty);
                                }
                            }
                        }
                    }
                    if (uri.HostNameType != UriHostNameType.IPv6 && !uri.IdnHost.Contains('.'))
                    {
                        // Not address and does not have a dot.
                        // Hosts without FQDN are considered local.
                        return(MultiProxy.Empty);
                    }
                }

                // Check if we have other rules for bypass.
                if (_bypass != null)
                {
                    foreach (string entry in _bypass)
                    {
                        // IdnHost does not have [].
                        if (SimpleRegex.IsMatchWithStarWildcard(uri.IdnHost, entry))
                        {
                            return(MultiProxy.Empty);
                        }
                    }
                }

                // We did not find match on bypass list.
                return(IsSecureUri(uri) ? _secureProxy : _insecureProxy);
            }

            return(MultiProxy.Empty);
        }
コード例 #4
0
        /// <summary>
        /// Iterates a request over a set of proxies until one works, or all proxies have failed.
        /// </summary>
        /// <param name="multiProxy">The set of proxies to use.</param>
        /// <param name="firstProxy">The first proxy try.</param>
        private async Task <HttpResponseMessage> SendAsyncMultiProxy(HttpRequestMessage request, bool doRequestAuth, MultiProxy multiProxy, Uri firstProxy, CancellationToken cancellationToken)
        {
            HttpRequestException rethrowException = null;

            do
            {
                try
                {
                    return(await SendAsyncCore(request, firstProxy, doRequestAuth, isProxyConnect : false, cancellationToken).ConfigureAwait(false));
                }
                catch (HttpRequestException ex) when(ex.AllowRetry != RequestRetryType.NoRetry)
                {
                    rethrowException = ex;
                }
            }while (multiProxy.ReadNext(out firstProxy, out _));

            ExceptionDispatchInfo.Throw(rethrowException);
            return(null); // should never be reached: VS doesn't realize Throw() never returns.
        }