_ProxyRegBlob.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Net / System / Net / _ProxyRegBlob.cs / 1 / _ProxyRegBlob.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System; 
    using System.Security.Permissions;
    using System.Globalization; 
    using System.Text;
    using System.Text.RegularExpressions;
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Net.Sockets;
    using System.Threading; 
    using System.Runtime.InteropServices; 
#if USE_WINIET_AUTODETECT_CACHE
#if !FEATURE_PAL 
    using FILETIME = System.Runtime.InteropServices.ComTypes.FILETIME;
#endif // !FEATURE_PAL
#endif
    using Microsoft.Win32; 
    using System.Runtime.Versioning;
 
    internal class ProxyRegBlob { 

#if !FEATURE_PAL 
        //
        // Allows us to grob through the registry and read the
        //  IE binary format, note that this should be replaced,
        //  by code that calls Wininet directly, but it can be 
        //  expensive to load wininet, in order to do this.
        // 
 
        [Flags]
        private enum ProxyTypeFlags 
        {
            PROXY_TYPE_DIRECT          = 0x00000001,   // direct to net
            PROXY_TYPE_PROXY           = 0x00000002,   // via named proxy
            PROXY_TYPE_AUTO_PROXY_URL  = 0x00000004,   // autoproxy URL 
            PROXY_TYPE_AUTO_DETECT     = 0x00000008,   // use autoproxy detection
        } 
 
        internal const string PolicyKey = @"SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings";
        internal const string ProxyKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections"; 
        private const string DefaultConnectionSettings = "DefaultConnectionSettings";
        private const string ProxySettingsPerUser = "ProxySettingsPerUser";

#if USE_WINIET_AUTODETECT_CACHE 
        // Get the number of MilliSeconds in 7 days and then multiply by 10 because
        // FILETIME stores data stores time in 100-nanosecond intervals. 
        // 
        internal static UInt64 s_lkgScriptValidTime = (UInt64)(new TimeSpan(7, 0, 0, 0).Ticks); // 7 days
#endif 

        const int IE50StrucSize = 60;

        private byte[] m_RegistryBytes; 
        private int m_ByteOffset;
 
        // returns true - on successful read of proxy registry settings 
        [RegistryPermission(SecurityAction.Assert, Read=@"HKEY_LOCAL_MACHINE\" + PolicyKey)]
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        private bool ReadRegSettings(string connectoid, SafeRegistryHandle hkcu)
        {
            SafeRegistryHandle key = null; 
            RegistryKey lmKey = null;
            try { 
                bool isPerUser = true; 
                lmKey = Registry.LocalMachine.OpenSubKey(PolicyKey);
                if (lmKey != null) 
                {
                    object perUser = lmKey.GetValue(ProxySettingsPerUser);
                    if (perUser != null && perUser.GetType() == typeof(int) && 0 == (int) perUser)
                    { 
                        isPerUser = false;
                    } 
                } 

                uint errorCode; 
                if (isPerUser)
                {
                    if (hkcu != null)
                    { 
                        errorCode = hkcu.RegOpenKeyEx(ProxyKey, 0, UnsafeNclNativeMethods.RegistryHelper.KEY_READ, out key);
                    } 
                    else 
                    {
                        errorCode = UnsafeNclNativeMethods.ErrorCodes.ERROR_NOT_FOUND; 
                    }
                }
                else
                { 
                    errorCode = SafeRegistryHandle.RegOpenKeyEx(UnsafeNclNativeMethods.RegistryHelper.HKEY_LOCAL_MACHINE, ProxyKey, 0, UnsafeNclNativeMethods.RegistryHelper.KEY_READ, out key);
                } 
                if (errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) 
                {
                    key = null; 
                }
                if (key != null)
                {
                    // When reading settings from the registry, if connectoid key is missing, the connectoid 
                    // was never configured. In this case we have no settings (this is equivalent to always go direct).
                    object data; 
                    errorCode = key.QueryValue(connectoid != null ? connectoid : DefaultConnectionSettings, out data); 
                    if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS)
                    { 
                        m_RegistryBytes = (byte[]) data;
                    }
                }
            } 
            catch (Exception exception) {
                if (NclUtilities.IsFatal(exception)) throw; 
            } 
            finally
            { 
                if (lmKey != null)
                    lmKey.Close();

                if(key != null) 
                    key.RegCloseKey();
            } 
            return m_RegistryBytes != null; 
        }
 
#if USE_WINIET_AUTODETECT_CACHE
        public FILETIME ReadFileTime() {
            FILETIME ft = new FILETIME();
            ft.dwLowDateTime = ReadInt32(); 
            ft.dwHighDateTime = ReadInt32();
            return ft; 
        } 
#endif
 
        //
        // Reads a string from the byte buffer, cached
        //  inside this object, and then updates the
        //  offset, NOTE: Must be in the correct offset 
        //  before reading, or will error
        // 
        public string ReadString() { 
            string stringOut = null;
            int stringSize = ReadInt32(); 
            if (stringSize>0) {
                // prevent reading too much
                int actualSize = m_RegistryBytes.Length - m_ByteOffset;
                if (stringSize >= actualSize) { 
                    stringSize = actualSize;
                } 
                stringOut = Encoding.UTF8.GetString(m_RegistryBytes, m_ByteOffset, stringSize); 
                m_ByteOffset += stringSize;
            } 
            return stringOut;
        }

 
        //
        // Reads a DWORD into a Int32, used to read 
        //  a int from the byte buffer. 
        //
        internal unsafe int ReadInt32() { 
            int intValue = 0;
            int actualSize = m_RegistryBytes.Length - m_ByteOffset;
            // copy bytes and increment offset
            if (actualSize>=sizeof(int)) { 
                fixed (byte* pBuffer = m_RegistryBytes) {
                    if (sizeof(IntPtr)==4) { 
                        intValue = *((int*)(pBuffer + m_ByteOffset)); 
                    }
                    else { 
                        intValue = Marshal.ReadInt32((IntPtr)pBuffer, m_ByteOffset);
                    }
                }
                m_ByteOffset += sizeof(int); 
            }
            // tell caller what we actually read 
            return intValue; 
        }
#else // !FEATURE_PAL 
        private static string ReadConfigString(string ConfigName) {
            const int parameterValueLength = 255;
            StringBuilder parameterValue = new StringBuilder(parameterValueLength);
            bool rc = UnsafeNclNativeMethods.FetchConfigurationString(true, ConfigName, parameterValue, parameterValueLength); 
            if (rc) {
                return parameterValue.ToString(); 
            } 
            return "";
        } 
#endif // !FEATURE_PAL

        //
        // Parses out a string from IE and turns it into a URI 
        //
        private static Uri ParseProxyUri(string proxyString, bool validate) { 
            if (validate) { 
                if (proxyString.Length == 0) {
                    return null; 
                }
                if (proxyString.IndexOf('=') != -1) {
                    return null;
                } 
            }
            if (proxyString.IndexOf("://") == -1) { 
                proxyString = "http://" + proxyString; 
            }
            return new Uri(proxyString); 
        }

        //
        // Builds a hashtable containing the protocol and proxy URI to use for it. 
        //
        private static Hashtable ParseProtocolProxies(string proxyListString) { 
            if (proxyListString.Length == 0) { 
                return null;
            } 
            // parse something like "http=http://http-proxy;https=http://https-proxy;ftp=http://ftp-proxy"
            char[] splitChars = new char[] { ';', '=' };
            string[] proxyListStrings = proxyListString.Split(splitChars);
            bool protocolPass = true; 
            string protocolString = null;
            Hashtable proxyListHashTable = new Hashtable(CaseInsensitiveAscii.StaticInstance); 
            foreach (string elementString in proxyListStrings) { 
                string elementString2 = elementString.Trim().ToLower(CultureInfo.InvariantCulture);
                if (protocolPass) { 
                    protocolString = elementString2;
                }
                else {
                    proxyListHashTable[protocolString] = ParseProxyUri(elementString2, false); 
                }
                protocolPass = !protocolPass; 
            } 
            if (proxyListHashTable.Count == 0) {
                return null; 
            }
            return proxyListHashTable;
        }
 
        //
        // Converts a simple IE regular expresion string into one 
        //  that is compatible with Regex escape sequences. 
        //
        private static string BypassStringEscape(string rawString) { 

            // Break up raw string into scheme, host, port.
            // This regular expression is used to get the three components.
            // Scheme and port are optional. 
            // If Match fails just assume whole string is the host.
            Regex parser = new 
                Regex("^(?.*://)?(?[^:]*)(?:[0-9]{1,5})?$", 
                RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
            Match results = parser.Match(rawString); 
            string scheme, host, port;
            if (results.Success) {
                scheme = results.Groups["scheme"].Value;
                host = results.Groups["host"].Value; 
                port = results.Groups["port"].Value;
            } else { 
                // Match method failed - set host to whole bypass string 
                scheme = string.Empty;
                host = rawString; 
                port = string.Empty;
            }

            // Escape any regex reserved chars before constructing final regex. 
            scheme = ConvertRegexReservedChars(scheme);
            host = ConvertRegexReservedChars(host); 
            port = ConvertRegexReservedChars(port); 

 
            // If scheme or port not specified use regular
            // expression "wildcards" for them.
            if (scheme == string.Empty) {
                // match any leading scheme plus separator 
                // but don't require it
                scheme = "(?:.*://)?"; 
            } 
            if (port == string.Empty) {
                // match a port but don't require it 
                port = "(?::[0-9]{1,5})?";
            }

            // Construct and return final regular expression 
            // with start-of-line and end-of-line anchors.
            return "^" + scheme + host + port + "$"; 
        } 

 
        private const string regexReserved = "#$()+.?[\\^{|";

        private static string ConvertRegexReservedChars(string rawString) {
            // Regular expressions reserve 
            //   (1) "#$()+.?[\^{|" as special chars.
            //   (2) "*" as a special char. 
            //   (3) whitespace as a special char. 
            // Convert any char "c" in above list to "\c".
            // Convert reserved char "*" to ".*". 
            // Leave whitespace as-is.
            if (rawString.Length == 0)
                return rawString;
            StringBuilder builder = new StringBuilder(); 
            foreach (char c in rawString) {
                if (regexReserved.IndexOf(c) != -1) { 
                    builder.Append('\\'); 
                } else if (c == '*') {
                    builder.Append('.'); 
                }
                builder.Append(c);
            }
            return builder.ToString(); 
        }
 
        // 
        // Parses out a string of bypass list entries and coverts it to Regex's that can be used
        //   to match against. 
        //
        private static ArrayList ParseBypassList(string bypassListString, out bool bypassOnLocal) {
            char[] splitChars = new char[] {';'};
            string[] bypassListStrings = bypassListString.Split(splitChars); 
            bypassOnLocal = false;
            if (bypassListStrings.Length == 0) { 
                return null; 
            }
            ArrayList bypassList = null; 
            foreach (string bypassString in bypassListStrings) {
                if (bypassString!=null) {
                    string bypassString2 = bypassString.Trim();
                    if (bypassString2.Length>0) { 
                        if (string.Compare(bypassString2, "", StringComparison.OrdinalIgnoreCase)==0) {
                            bypassOnLocal = true; 
                        } 
                        else {
                            bypassString2 = BypassStringEscape(bypassString2); 
                            if (bypassList==null) {
                                bypassList = new ArrayList();
                            }
                            GlobalLog.Print("ProxyRegBlob::ParseBypassList() bypassList.Count:" + bypassList.Count + " adding:" + ValidationHelper.ToString(bypassString2)); 
                            if (!bypassList.Contains(bypassString2)) {
                                bypassList.Add(bypassString2); 
                                GlobalLog.Print("ProxyRegBlob::ParseBypassList() bypassList.Count:" + bypassList.Count + " added:" + ValidationHelper.ToString(bypassString2)); 
                            }
                        } 
                    }
                }
            }
            return bypassList; 
        }
 
        // 
        // Updates an instance of WbeProxy with the proxy settings from IE for:
        // the current user and a given connectoid. 
        //
        [ResourceExposure(ResourceScope.Machine)]  // Check scoping on this SafeRegistryHandle
        [ResourceConsumption(ResourceScope.Machine)]
#if !FEATURE_PAL 
        internal static WebProxyData GetWebProxyData(string connectoid, SafeRegistryHandle hkcu)
#else // !FEATURE_PAL 
        internal static WebProxyData GetWebProxyData(string connectoid) 
#endif // !FEATURE_PAL
        { 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() connectoid:" + ValidationHelper.ToString(connectoid));
            WebProxyData webProxyData = new WebProxyData();
            Hashtable proxyHashTable = null;
            Uri address = null; 

#if !FEATURE_PAL 
            ProxyRegBlob proxyIE5Settings = new ProxyRegBlob(); 
            // DON'T TOUCH THE ORDERING OF THE CALLS TO THE INSTANCE OF ProxyRegBlob
            bool success = proxyIE5Settings.ReadRegSettings(connectoid, hkcu); 
            if (success) {
                success = proxyIE5Settings.ReadInt32()>=ProxyRegBlob.IE50StrucSize;
            }
            if (!success) { 
                // if registry access fails rely on automatic detection
                webProxyData.automaticallyDetectSettings = true; 
                return webProxyData; 
            }
            // read the rest of the items out 
            proxyIE5Settings.ReadInt32(); // incremental version# of current settings (ignored)
            ProxyTypeFlags proxyFlags = (ProxyTypeFlags)proxyIE5Settings.ReadInt32(); // flags
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() proxyFlags:" + ValidationHelper.ToString(proxyFlags));
 
            string addressString = proxyIE5Settings.ReadString(); // proxy name
            string proxyBypassString = proxyIE5Settings.ReadString(); // proxy bypass 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() proxyAddressString:" + ValidationHelper.ToString(addressString) + " proxyBypassString:" + ValidationHelper.ToString(proxyBypassString)); 

            // 
            // Once we verify that the flag for proxy is enabled,
            // Parse UriString that is stored, may be in the form,
            //  of "http=http://http-proxy;ftp="ftp=http://..." must
            //  handle this case along with just a URI. 
            //
            if ((proxyFlags & ProxyTypeFlags.PROXY_TYPE_PROXY)!=0) { 
                try { 

 			//VSWHIDBEY: 583058 
			//When the "manual" proxy check box is checked and there is no proxy string
			//present, the ReadString above returns null.
			//Which means thet when we call the ParseProxyUri, there will be an
 			//Aceess Violation since we try to compute the length of the string 
			//The fix is to not do any more processing if the addresString is null
 			if(addressString != null) 
 			{ 
	                    address = ParseProxyUri(addressString, true);
 	                    if ( address == null ) { 
	                        proxyHashTable = ParseProtocolProxies(addressString);
	                    }
	                    if ((address != null || proxyHashTable != null) && proxyBypassString != null) {
 	                        // reuse success for bypassOnLocal 
	                        webProxyData.bypassList = ParseBypassList(proxyBypassString, out success);
 	                        webProxyData.bypassOnLocal = success; 
 	                    } 
			}
                } 
                catch (Exception exception) {
                    if (NclUtilities.IsFatal(exception)) throw;
                }
            } 
#else // !FEATURE_PAL
            string proxyAddressString = ReadConfigString("ProxyUri"); 
            string proxyBypassString = ReadConfigString("ProxyBypass"); 
            try {
 		if(proxyAddressString != null)			 
		{
	                address = ParseProxyUri(proxyAddressString, true);
	                if ( address == null ) {
 	                    proxyHashTable = ParseProtocolProxies(proxyAddressString); 
	                }
 	                if ((address != null || proxyHashTable != null) && proxyBypassString != null ) { 
 	                    webProxyData.bypassList = ParseBypassList(proxyBypassString, out webProxyData.bypassOnLocal); 
	                }
 		} 
                // success if we reach here
            }
            catch {
            } 
#endif // !FEATURE_PAL
 
            if (proxyHashTable!=null) { 
                address = proxyHashTable["http"] as Uri;
            } 
            webProxyData.proxyAddress = address;

#if !FEATURE_PAL
            webProxyData.automaticallyDetectSettings = (proxyFlags & ProxyTypeFlags.PROXY_TYPE_AUTO_DETECT)!=0; 

            // reuse addressString for scriptLocationString 
            addressString = proxyIE5Settings.ReadString(); // autoconfig url 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() scriptLocation:" + ValidationHelper.ToString(addressString));
            if ((proxyFlags & ProxyTypeFlags.PROXY_TYPE_AUTO_PROXY_URL)!=0) { 
                // reuse addressString for scriptLocation
                if (Uri.TryCreate(addressString, UriKind.Absolute, out address)) {
                    webProxyData.scriptLocation = address;
                } 
            }
 
// The final straw against attempting to use the WinInet LKG script location was, it's invalid when IPs have changed even if the 
// connectoid hadn't.  Doing that validation didn't seem worth it (error-prone, expensive, unsupported).
#if USE_WINIET_AUTODETECT_CACHE 
            proxyIE5Settings.ReadInt32(); // autodetect flags (ignored)

            // reuse addressString for lkgScriptLocationString
            addressString = proxyIE5Settings.ReadString(); // last known good auto-proxy url 

            // read ftLastKnownDetectTime 
            FILETIME ftLastKnownDetectTime = proxyIE5Settings.ReadFileTime(); 

            // Verify if this lkgScriptLocationString has timed out 
            //
            if (IsValidTimeForLkgScriptLocation(ftLastKnownDetectTime)) {
                // reuse address for lkgScriptLocation
                GlobalLog.Print("ProxyRegBlob::GetWebProxyData() lkgScriptLocation:" + ValidationHelper.ToString(addressString)); 
                if (Uri.TryCreate(addressString, UriKind.Absolute, out address)) {
                    webProxyData.lkgScriptLocation = address; 
                } 
            }
            else { 
#if TRAVE
                SYSTEMTIME st = new SYSTEMTIME();
                bool f = SafeNclNativeMethods.FileTimeToSystemTime(ref ftLastKnownDetectTime, ref st);
                if (f) 
                    GlobalLog.Print("ProxyRegBlob::GetWebProxyData() ftLastKnownDetectTime:" + ValidationHelper.ToString(st));
#endif // TRAVE 
                GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Ignoring Timed out lkgScriptLocation:" + ValidationHelper.ToString(addressString)); 

                // Now rely on automatic detection settings set above 
                // based on the proxy flags (webProxyData.automaticallyDetectSettings).
                //
            }
#endif 
            /*
            // This is some of the rest of the proxy reg key blob parsing. 
            // 
            // Read Inte---- IPs
            int iftCount = proxyIE5Settings.ReadInt32(); 
            for (int ift = 0; ift < iftCount; ++ift) {
                proxyIE5Settings.ReadInt32();
            }
 
            // Read lpszAutoconfigSecondaryUrl
            string autoconfigSecondaryUrl = proxyIE5Settings.ReadString(); 
 
            // Read dwAutoconfigReloadDelayMins
            int autoconfigReloadDelayMins = proxyIE5Settings.ReadInt32(); 
            */
#endif
            return webProxyData;
        } 

#if USE_WINIET_AUTODETECT_CACHE 
#if !FEATURE_PAL 
        internal unsafe static bool IsValidTimeForLkgScriptLocation(FILETIME ftLastKnownDetectTime) {
            // Get Current System Time. 
            FILETIME ftCurrentTime = new FILETIME();
            SafeNclNativeMethods.GetSystemTimeAsFileTime(ref ftCurrentTime);

            UInt64 ftDetect = (UInt64)ftLastKnownDetectTime.dwHighDateTime; 
            ftDetect <<= (sizeof(int) * 8);
            ftDetect |= (UInt64)(uint)ftLastKnownDetectTime.dwLowDateTime; 
 
            UInt64 ftCurrent = (UInt64)ftCurrentTime.dwHighDateTime;
            ftCurrent <<= (sizeof(int) * 8); 
            ftCurrent |= (UInt64)(uint)ftCurrentTime.dwLowDateTime;

            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Detect Time:" + ValidationHelper.ToString(ftDetect));
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Current Time:" + ValidationHelper.ToString(ftCurrent)); 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() 7 days:" + ValidationHelper.ToString(s_lkgScriptValidTime));
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Delta Time:" + ValidationHelper.ToString((UInt64)(ftCurrent - ftDetect))); 
 
            return (ftCurrent - ftDetect) < s_lkgScriptValidTime;
        } 
#endif // !FEATURE_PAL
#endif
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net { 
    using System; 
    using System.Security.Permissions;
    using System.Globalization; 
    using System.Text;
    using System.Text.RegularExpressions;
    using System.Collections;
    using System.Collections.Specialized; 
    using System.Net.Sockets;
    using System.Threading; 
    using System.Runtime.InteropServices; 
#if USE_WINIET_AUTODETECT_CACHE
#if !FEATURE_PAL 
    using FILETIME = System.Runtime.InteropServices.ComTypes.FILETIME;
#endif // !FEATURE_PAL
#endif
    using Microsoft.Win32; 
    using System.Runtime.Versioning;
 
    internal class ProxyRegBlob { 

#if !FEATURE_PAL 
        //
        // Allows us to grob through the registry and read the
        //  IE binary format, note that this should be replaced,
        //  by code that calls Wininet directly, but it can be 
        //  expensive to load wininet, in order to do this.
        // 
 
        [Flags]
        private enum ProxyTypeFlags 
        {
            PROXY_TYPE_DIRECT          = 0x00000001,   // direct to net
            PROXY_TYPE_PROXY           = 0x00000002,   // via named proxy
            PROXY_TYPE_AUTO_PROXY_URL  = 0x00000004,   // autoproxy URL 
            PROXY_TYPE_AUTO_DETECT     = 0x00000008,   // use autoproxy detection
        } 
 
        internal const string PolicyKey = @"SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings";
        internal const string ProxyKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections"; 
        private const string DefaultConnectionSettings = "DefaultConnectionSettings";
        private const string ProxySettingsPerUser = "ProxySettingsPerUser";

#if USE_WINIET_AUTODETECT_CACHE 
        // Get the number of MilliSeconds in 7 days and then multiply by 10 because
        // FILETIME stores data stores time in 100-nanosecond intervals. 
        // 
        internal static UInt64 s_lkgScriptValidTime = (UInt64)(new TimeSpan(7, 0, 0, 0).Ticks); // 7 days
#endif 

        const int IE50StrucSize = 60;

        private byte[] m_RegistryBytes; 
        private int m_ByteOffset;
 
        // returns true - on successful read of proxy registry settings 
        [RegistryPermission(SecurityAction.Assert, Read=@"HKEY_LOCAL_MACHINE\" + PolicyKey)]
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        private bool ReadRegSettings(string connectoid, SafeRegistryHandle hkcu)
        {
            SafeRegistryHandle key = null; 
            RegistryKey lmKey = null;
            try { 
                bool isPerUser = true; 
                lmKey = Registry.LocalMachine.OpenSubKey(PolicyKey);
                if (lmKey != null) 
                {
                    object perUser = lmKey.GetValue(ProxySettingsPerUser);
                    if (perUser != null && perUser.GetType() == typeof(int) && 0 == (int) perUser)
                    { 
                        isPerUser = false;
                    } 
                } 

                uint errorCode; 
                if (isPerUser)
                {
                    if (hkcu != null)
                    { 
                        errorCode = hkcu.RegOpenKeyEx(ProxyKey, 0, UnsafeNclNativeMethods.RegistryHelper.KEY_READ, out key);
                    } 
                    else 
                    {
                        errorCode = UnsafeNclNativeMethods.ErrorCodes.ERROR_NOT_FOUND; 
                    }
                }
                else
                { 
                    errorCode = SafeRegistryHandle.RegOpenKeyEx(UnsafeNclNativeMethods.RegistryHelper.HKEY_LOCAL_MACHINE, ProxyKey, 0, UnsafeNclNativeMethods.RegistryHelper.KEY_READ, out key);
                } 
                if (errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS) 
                {
                    key = null; 
                }
                if (key != null)
                {
                    // When reading settings from the registry, if connectoid key is missing, the connectoid 
                    // was never configured. In this case we have no settings (this is equivalent to always go direct).
                    object data; 
                    errorCode = key.QueryValue(connectoid != null ? connectoid : DefaultConnectionSettings, out data); 
                    if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS)
                    { 
                        m_RegistryBytes = (byte[]) data;
                    }
                }
            } 
            catch (Exception exception) {
                if (NclUtilities.IsFatal(exception)) throw; 
            } 
            finally
            { 
                if (lmKey != null)
                    lmKey.Close();

                if(key != null) 
                    key.RegCloseKey();
            } 
            return m_RegistryBytes != null; 
        }
 
#if USE_WINIET_AUTODETECT_CACHE
        public FILETIME ReadFileTime() {
            FILETIME ft = new FILETIME();
            ft.dwLowDateTime = ReadInt32(); 
            ft.dwHighDateTime = ReadInt32();
            return ft; 
        } 
#endif
 
        //
        // Reads a string from the byte buffer, cached
        //  inside this object, and then updates the
        //  offset, NOTE: Must be in the correct offset 
        //  before reading, or will error
        // 
        public string ReadString() { 
            string stringOut = null;
            int stringSize = ReadInt32(); 
            if (stringSize>0) {
                // prevent reading too much
                int actualSize = m_RegistryBytes.Length - m_ByteOffset;
                if (stringSize >= actualSize) { 
                    stringSize = actualSize;
                } 
                stringOut = Encoding.UTF8.GetString(m_RegistryBytes, m_ByteOffset, stringSize); 
                m_ByteOffset += stringSize;
            } 
            return stringOut;
        }

 
        //
        // Reads a DWORD into a Int32, used to read 
        //  a int from the byte buffer. 
        //
        internal unsafe int ReadInt32() { 
            int intValue = 0;
            int actualSize = m_RegistryBytes.Length - m_ByteOffset;
            // copy bytes and increment offset
            if (actualSize>=sizeof(int)) { 
                fixed (byte* pBuffer = m_RegistryBytes) {
                    if (sizeof(IntPtr)==4) { 
                        intValue = *((int*)(pBuffer + m_ByteOffset)); 
                    }
                    else { 
                        intValue = Marshal.ReadInt32((IntPtr)pBuffer, m_ByteOffset);
                    }
                }
                m_ByteOffset += sizeof(int); 
            }
            // tell caller what we actually read 
            return intValue; 
        }
#else // !FEATURE_PAL 
        private static string ReadConfigString(string ConfigName) {
            const int parameterValueLength = 255;
            StringBuilder parameterValue = new StringBuilder(parameterValueLength);
            bool rc = UnsafeNclNativeMethods.FetchConfigurationString(true, ConfigName, parameterValue, parameterValueLength); 
            if (rc) {
                return parameterValue.ToString(); 
            } 
            return "";
        } 
#endif // !FEATURE_PAL

        //
        // Parses out a string from IE and turns it into a URI 
        //
        private static Uri ParseProxyUri(string proxyString, bool validate) { 
            if (validate) { 
                if (proxyString.Length == 0) {
                    return null; 
                }
                if (proxyString.IndexOf('=') != -1) {
                    return null;
                } 
            }
            if (proxyString.IndexOf("://") == -1) { 
                proxyString = "http://" + proxyString; 
            }
            return new Uri(proxyString); 
        }

        //
        // Builds a hashtable containing the protocol and proxy URI to use for it. 
        //
        private static Hashtable ParseProtocolProxies(string proxyListString) { 
            if (proxyListString.Length == 0) { 
                return null;
            } 
            // parse something like "http=http://http-proxy;https=http://https-proxy;ftp=http://ftp-proxy"
            char[] splitChars = new char[] { ';', '=' };
            string[] proxyListStrings = proxyListString.Split(splitChars);
            bool protocolPass = true; 
            string protocolString = null;
            Hashtable proxyListHashTable = new Hashtable(CaseInsensitiveAscii.StaticInstance); 
            foreach (string elementString in proxyListStrings) { 
                string elementString2 = elementString.Trim().ToLower(CultureInfo.InvariantCulture);
                if (protocolPass) { 
                    protocolString = elementString2;
                }
                else {
                    proxyListHashTable[protocolString] = ParseProxyUri(elementString2, false); 
                }
                protocolPass = !protocolPass; 
            } 
            if (proxyListHashTable.Count == 0) {
                return null; 
            }
            return proxyListHashTable;
        }
 
        //
        // Converts a simple IE regular expresion string into one 
        //  that is compatible with Regex escape sequences. 
        //
        private static string BypassStringEscape(string rawString) { 

            // Break up raw string into scheme, host, port.
            // This regular expression is used to get the three components.
            // Scheme and port are optional. 
            // If Match fails just assume whole string is the host.
            Regex parser = new 
                Regex("^(?.*://)?(?[^:]*)(?:[0-9]{1,5})?$", 
                RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
            Match results = parser.Match(rawString); 
            string scheme, host, port;
            if (results.Success) {
                scheme = results.Groups["scheme"].Value;
                host = results.Groups["host"].Value; 
                port = results.Groups["port"].Value;
            } else { 
                // Match method failed - set host to whole bypass string 
                scheme = string.Empty;
                host = rawString; 
                port = string.Empty;
            }

            // Escape any regex reserved chars before constructing final regex. 
            scheme = ConvertRegexReservedChars(scheme);
            host = ConvertRegexReservedChars(host); 
            port = ConvertRegexReservedChars(port); 

 
            // If scheme or port not specified use regular
            // expression "wildcards" for them.
            if (scheme == string.Empty) {
                // match any leading scheme plus separator 
                // but don't require it
                scheme = "(?:.*://)?"; 
            } 
            if (port == string.Empty) {
                // match a port but don't require it 
                port = "(?::[0-9]{1,5})?";
            }

            // Construct and return final regular expression 
            // with start-of-line and end-of-line anchors.
            return "^" + scheme + host + port + "$"; 
        } 

 
        private const string regexReserved = "#$()+.?[\\^{|";

        private static string ConvertRegexReservedChars(string rawString) {
            // Regular expressions reserve 
            //   (1) "#$()+.?[\^{|" as special chars.
            //   (2) "*" as a special char. 
            //   (3) whitespace as a special char. 
            // Convert any char "c" in above list to "\c".
            // Convert reserved char "*" to ".*". 
            // Leave whitespace as-is.
            if (rawString.Length == 0)
                return rawString;
            StringBuilder builder = new StringBuilder(); 
            foreach (char c in rawString) {
                if (regexReserved.IndexOf(c) != -1) { 
                    builder.Append('\\'); 
                } else if (c == '*') {
                    builder.Append('.'); 
                }
                builder.Append(c);
            }
            return builder.ToString(); 
        }
 
        // 
        // Parses out a string of bypass list entries and coverts it to Regex's that can be used
        //   to match against. 
        //
        private static ArrayList ParseBypassList(string bypassListString, out bool bypassOnLocal) {
            char[] splitChars = new char[] {';'};
            string[] bypassListStrings = bypassListString.Split(splitChars); 
            bypassOnLocal = false;
            if (bypassListStrings.Length == 0) { 
                return null; 
            }
            ArrayList bypassList = null; 
            foreach (string bypassString in bypassListStrings) {
                if (bypassString!=null) {
                    string bypassString2 = bypassString.Trim();
                    if (bypassString2.Length>0) { 
                        if (string.Compare(bypassString2, "", StringComparison.OrdinalIgnoreCase)==0) {
                            bypassOnLocal = true; 
                        } 
                        else {
                            bypassString2 = BypassStringEscape(bypassString2); 
                            if (bypassList==null) {
                                bypassList = new ArrayList();
                            }
                            GlobalLog.Print("ProxyRegBlob::ParseBypassList() bypassList.Count:" + bypassList.Count + " adding:" + ValidationHelper.ToString(bypassString2)); 
                            if (!bypassList.Contains(bypassString2)) {
                                bypassList.Add(bypassString2); 
                                GlobalLog.Print("ProxyRegBlob::ParseBypassList() bypassList.Count:" + bypassList.Count + " added:" + ValidationHelper.ToString(bypassString2)); 
                            }
                        } 
                    }
                }
            }
            return bypassList; 
        }
 
        // 
        // Updates an instance of WbeProxy with the proxy settings from IE for:
        // the current user and a given connectoid. 
        //
        [ResourceExposure(ResourceScope.Machine)]  // Check scoping on this SafeRegistryHandle
        [ResourceConsumption(ResourceScope.Machine)]
#if !FEATURE_PAL 
        internal static WebProxyData GetWebProxyData(string connectoid, SafeRegistryHandle hkcu)
#else // !FEATURE_PAL 
        internal static WebProxyData GetWebProxyData(string connectoid) 
#endif // !FEATURE_PAL
        { 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() connectoid:" + ValidationHelper.ToString(connectoid));
            WebProxyData webProxyData = new WebProxyData();
            Hashtable proxyHashTable = null;
            Uri address = null; 

#if !FEATURE_PAL 
            ProxyRegBlob proxyIE5Settings = new ProxyRegBlob(); 
            // DON'T TOUCH THE ORDERING OF THE CALLS TO THE INSTANCE OF ProxyRegBlob
            bool success = proxyIE5Settings.ReadRegSettings(connectoid, hkcu); 
            if (success) {
                success = proxyIE5Settings.ReadInt32()>=ProxyRegBlob.IE50StrucSize;
            }
            if (!success) { 
                // if registry access fails rely on automatic detection
                webProxyData.automaticallyDetectSettings = true; 
                return webProxyData; 
            }
            // read the rest of the items out 
            proxyIE5Settings.ReadInt32(); // incremental version# of current settings (ignored)
            ProxyTypeFlags proxyFlags = (ProxyTypeFlags)proxyIE5Settings.ReadInt32(); // flags
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() proxyFlags:" + ValidationHelper.ToString(proxyFlags));
 
            string addressString = proxyIE5Settings.ReadString(); // proxy name
            string proxyBypassString = proxyIE5Settings.ReadString(); // proxy bypass 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() proxyAddressString:" + ValidationHelper.ToString(addressString) + " proxyBypassString:" + ValidationHelper.ToString(proxyBypassString)); 

            // 
            // Once we verify that the flag for proxy is enabled,
            // Parse UriString that is stored, may be in the form,
            //  of "http=http://http-proxy;ftp="ftp=http://..." must
            //  handle this case along with just a URI. 
            //
            if ((proxyFlags & ProxyTypeFlags.PROXY_TYPE_PROXY)!=0) { 
                try { 

 			//VSWHIDBEY: 583058 
			//When the "manual" proxy check box is checked and there is no proxy string
			//present, the ReadString above returns null.
			//Which means thet when we call the ParseProxyUri, there will be an
 			//Aceess Violation since we try to compute the length of the string 
			//The fix is to not do any more processing if the addresString is null
 			if(addressString != null) 
 			{ 
	                    address = ParseProxyUri(addressString, true);
 	                    if ( address == null ) { 
	                        proxyHashTable = ParseProtocolProxies(addressString);
	                    }
	                    if ((address != null || proxyHashTable != null) && proxyBypassString != null) {
 	                        // reuse success for bypassOnLocal 
	                        webProxyData.bypassList = ParseBypassList(proxyBypassString, out success);
 	                        webProxyData.bypassOnLocal = success; 
 	                    } 
			}
                } 
                catch (Exception exception) {
                    if (NclUtilities.IsFatal(exception)) throw;
                }
            } 
#else // !FEATURE_PAL
            string proxyAddressString = ReadConfigString("ProxyUri"); 
            string proxyBypassString = ReadConfigString("ProxyBypass"); 
            try {
 		if(proxyAddressString != null)			 
		{
	                address = ParseProxyUri(proxyAddressString, true);
	                if ( address == null ) {
 	                    proxyHashTable = ParseProtocolProxies(proxyAddressString); 
	                }
 	                if ((address != null || proxyHashTable != null) && proxyBypassString != null ) { 
 	                    webProxyData.bypassList = ParseBypassList(proxyBypassString, out webProxyData.bypassOnLocal); 
	                }
 		} 
                // success if we reach here
            }
            catch {
            } 
#endif // !FEATURE_PAL
 
            if (proxyHashTable!=null) { 
                address = proxyHashTable["http"] as Uri;
            } 
            webProxyData.proxyAddress = address;

#if !FEATURE_PAL
            webProxyData.automaticallyDetectSettings = (proxyFlags & ProxyTypeFlags.PROXY_TYPE_AUTO_DETECT)!=0; 

            // reuse addressString for scriptLocationString 
            addressString = proxyIE5Settings.ReadString(); // autoconfig url 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() scriptLocation:" + ValidationHelper.ToString(addressString));
            if ((proxyFlags & ProxyTypeFlags.PROXY_TYPE_AUTO_PROXY_URL)!=0) { 
                // reuse addressString for scriptLocation
                if (Uri.TryCreate(addressString, UriKind.Absolute, out address)) {
                    webProxyData.scriptLocation = address;
                } 
            }
 
// The final straw against attempting to use the WinInet LKG script location was, it's invalid when IPs have changed even if the 
// connectoid hadn't.  Doing that validation didn't seem worth it (error-prone, expensive, unsupported).
#if USE_WINIET_AUTODETECT_CACHE 
            proxyIE5Settings.ReadInt32(); // autodetect flags (ignored)

            // reuse addressString for lkgScriptLocationString
            addressString = proxyIE5Settings.ReadString(); // last known good auto-proxy url 

            // read ftLastKnownDetectTime 
            FILETIME ftLastKnownDetectTime = proxyIE5Settings.ReadFileTime(); 

            // Verify if this lkgScriptLocationString has timed out 
            //
            if (IsValidTimeForLkgScriptLocation(ftLastKnownDetectTime)) {
                // reuse address for lkgScriptLocation
                GlobalLog.Print("ProxyRegBlob::GetWebProxyData() lkgScriptLocation:" + ValidationHelper.ToString(addressString)); 
                if (Uri.TryCreate(addressString, UriKind.Absolute, out address)) {
                    webProxyData.lkgScriptLocation = address; 
                } 
            }
            else { 
#if TRAVE
                SYSTEMTIME st = new SYSTEMTIME();
                bool f = SafeNclNativeMethods.FileTimeToSystemTime(ref ftLastKnownDetectTime, ref st);
                if (f) 
                    GlobalLog.Print("ProxyRegBlob::GetWebProxyData() ftLastKnownDetectTime:" + ValidationHelper.ToString(st));
#endif // TRAVE 
                GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Ignoring Timed out lkgScriptLocation:" + ValidationHelper.ToString(addressString)); 

                // Now rely on automatic detection settings set above 
                // based on the proxy flags (webProxyData.automaticallyDetectSettings).
                //
            }
#endif 
            /*
            // This is some of the rest of the proxy reg key blob parsing. 
            // 
            // Read Inte---- IPs
            int iftCount = proxyIE5Settings.ReadInt32(); 
            for (int ift = 0; ift < iftCount; ++ift) {
                proxyIE5Settings.ReadInt32();
            }
 
            // Read lpszAutoconfigSecondaryUrl
            string autoconfigSecondaryUrl = proxyIE5Settings.ReadString(); 
 
            // Read dwAutoconfigReloadDelayMins
            int autoconfigReloadDelayMins = proxyIE5Settings.ReadInt32(); 
            */
#endif
            return webProxyData;
        } 

#if USE_WINIET_AUTODETECT_CACHE 
#if !FEATURE_PAL 
        internal unsafe static bool IsValidTimeForLkgScriptLocation(FILETIME ftLastKnownDetectTime) {
            // Get Current System Time. 
            FILETIME ftCurrentTime = new FILETIME();
            SafeNclNativeMethods.GetSystemTimeAsFileTime(ref ftCurrentTime);

            UInt64 ftDetect = (UInt64)ftLastKnownDetectTime.dwHighDateTime; 
            ftDetect <<= (sizeof(int) * 8);
            ftDetect |= (UInt64)(uint)ftLastKnownDetectTime.dwLowDateTime; 
 
            UInt64 ftCurrent = (UInt64)ftCurrentTime.dwHighDateTime;
            ftCurrent <<= (sizeof(int) * 8); 
            ftCurrent |= (UInt64)(uint)ftCurrentTime.dwLowDateTime;

            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Detect Time:" + ValidationHelper.ToString(ftDetect));
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Current Time:" + ValidationHelper.ToString(ftCurrent)); 
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() 7 days:" + ValidationHelper.ToString(s_lkgScriptValidTime));
            GlobalLog.Print("ProxyRegBlob::GetWebProxyData() Delta Time:" + ValidationHelper.ToString((UInt64)(ftCurrent - ftDetect))); 
 
            return (ftCurrent - ftDetect) < s_lkgScriptValidTime;
        } 
#endif // !FEATURE_PAL
#endif
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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