IisHelper.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Tools / xws_reg / System / ServiceModel / Install / IisHelper.cs / 2 / IisHelper.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.ServiceModel.Install 
{
    using Microsoft.Win32; 
    using System; 
    using System.Collections;
    using System.ComponentModel; 
    using System.Configuration;
    using System.DirectoryServices;
    using System.Runtime.InteropServices;
    using System.ServiceModel.Install.Configuration; 
    using System.ServiceProcess;
    using System.IO; 
    using Microsoft.Tools.ServiceModel; 

    static class IisHelper 
    {
        static bool isApplicationHostInstalled = false;
        static bool? isAspNetInstalled = null;
        static bool isWasInstalled = false; 
        static bool isIisInstalled = false;
        static bool isIisAdminEnabled = false; 
        static bool hasAttemptedRecovery = false; 

        static IisHelper() 
        {
            try
            {
                IisHelper.isApplicationHostInstalled = IIS7ConfigurationLoader.CheckApplicationHostInstalled(); 
            }
            catch (System.IO.FileNotFoundException) 
            { 
                // FileNotFoundException means that Microsoft.Web.Administration.dll is not installed and we cannot
                // install ApplicationHost.config entries 
                IisHelper.isApplicationHostInstalled = false;
            }

            IisHelper.CheckWasInstalled(); 
            IisHelper.CheckIisInstalled();
        } 
 
        static internal bool GetIsXP()
        { 
            const int XPMajorVersion = 5;
            const int XPMinorVersion = 1;
            return Environment.OSVersion.Version.Major == XPMajorVersion && Environment.OSVersion.Version.Minor == XPMinorVersion;
        } 

        static internal bool IsRecoverable(COMException e) 
        { 
            return e.ErrorCode == COMErrors.HRESULT_FROM_ERROR_PATH_BUSY;
        } 

        static internal bool AttemptRecovery()
        {
            // the return value is a bool indicating whether 
            // recovery was actually attempted
 
            if (hasAttemptedRecovery) 
            {
                // our recovery code recovers after running once, 
                // if it doesn't, no need to call it any further
                return false;
            }
 
            // this block of code is here to workaround possible metabase
            // locking issues that are known to cause our setup to fail at times 
            // call "iisreset /restart timeout:120" and ignore failures to ensure that the metabase 
            // (IISADMIN) is freshly started before we try calling any of its APIs
            string iisresetPath = Path.Combine(Environment.SystemDirectory, @"iisreset.exe"); 
            const string iisresetParams = "/restart /timeout:120";
            EventLogger.LogInformation(SR2.GetString(SR2.IISResetNeeded, iisresetPath + " " + iisresetParams), false);
            // if iisreset.exe was somehow missing from the box we won't be able to recover
            // and the following call to TryExecuteWait will throw a FileNotFoundException 
            InstallHelper.TryExecuteWait(OutputLevel.Normal, iisresetPath, iisresetParams);
 
            hasAttemptedRecovery = true; 
            return true;
        } 

        static internal void ValidateDirectoryEntry(DirectoryEntry entry)
        {
            try 
            {
                // Call RefreshCache to force the ADS object to bind 
                entry.RefreshCache(); 
            }
            catch (COMException e) 
            {
                if (GetIsXP() && IsRecoverable(e) && AttemptRecovery())
                {
                    entry.RefreshCache(); 
                }
                else 
                { 
                    throw;
                } 
            }
        }

        static void CheckAspNetInstalled() 
        {
            using (DirectoryEntry iisRootEntry = new DirectoryEntry(ServiceModelInstallStrings.IISAdsRoot)) 
            { 
                try
                { 
                    ValidateDirectoryEntry(iisRootEntry);
                    PropertyValueCollection scriptMapCollection = iisRootEntry.Properties[ServiceModelInstallStrings.ScriptMaps];
                    // Should never be null, but being overly protective here due to timing of this checkin...
                    if (null != scriptMapCollection) 
                    {
                        for (int i = 0; i < scriptMapCollection.Count; i++) 
                        { 
                            string scriptMapEntry = (string)scriptMapCollection[i];
 
                            if (!String.IsNullOrEmpty(scriptMapEntry))
                            {
                                // Sample script map entry:  .svc,C:\WINNT\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll,1,GET,HEAD,POST,DEBUG
                                string[] scriptMapParts = scriptMapEntry.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries); 
                                if (scriptMapParts.Length > 1 &&
                                    scriptMapParts[0].Equals(ServiceModelInstallStrings.AspNetScriptMapPath, StringComparison.OrdinalIgnoreCase) && 
                                    !String.IsNullOrEmpty((string)scriptMapParts[1])) 
                                {
                                    // Verify that the ASP.NET ISAPI filter registered is the same as what we expect to register 

                                    // Normalize current ISAPI filter and expected ISAPI filter in case strings contain
                                    // environment variables or are in short path form.
                                    string currentIsapiFilter = Environment.ExpandEnvironmentVariables(scriptMapParts[1]); 
                                    string expectedIsapiFilter = Environment.ExpandEnvironmentVariables(InstallHelper.IsapiFilter);
 
                                    try 
                                    {
                                        currentIsapiFilter = Path.GetFullPath(currentIsapiFilter); 
                                        expectedIsapiFilter = Path.GetFullPath(expectedIsapiFilter);
                                        if (scriptMapParts[1].Equals(InstallHelper.IsapiFilter, StringComparison.OrdinalIgnoreCase))
                                        {
                                            IisHelper.isAspNetInstalled = true; 
                                            break;
                                        } 
                                    } 
                                    // The system could not retrieve the absolute path
                                    catch (ArgumentException) { } 
                                    // The caller does not have the required permissions
                                    catch (System.Security.SecurityException) { }
                                    // Path contains a colon (":")
                                    catch (NotSupportedException) { } 
                                    // The specified path, file name, or both exceed the system-defined maximum length
                                    catch (PathTooLongException) { } 
                                } 
                            }
                        } 
                    }
                }
                catch (COMException e)
                { 
                    throw WrapIisError(e);
                } 
            } 
        }
 
        static internal Exception WrapIisError(COMException e)
        {
            if (e.ErrorCode == COMErrors.HRESULT_FROM_ERROR_PATH_BUSY)
            { 
                return new ApplicationException(SR2.GetString(SR2.LockedIISMetabaseError), e);
            } 
            return new ApplicationException(SR.GetString(SR.CorruptIISMetabaseError), e); 
        }
 
        static void CheckWasInstalled()
        {
            try
            { 
                using (ServiceController controller = new ServiceController(ServiceModelInstallStrings.WasName))
                { 
                    IisHelper.isWasInstalled = controller.ServiceName.Equals(ServiceModelInstallStrings.WasName, StringComparison.OrdinalIgnoreCase); 
                }
            } 
            catch (InvalidOperationException exception)
            {
                Win32Exception innerException = exception.InnerException as Win32Exception;
                if (innerException == null || 
                    innerException.NativeErrorCode != ErrorCodes.ERROR_SERVICE_DOES_NOT_EXIST)
                { 
                    throw; 
                }
            } 
        }

        static void CheckIisInstalled()
        { 
            try
            { 
                using (ServiceController w3svcController = new ServiceController(ServiceModelInstallStrings.W3svc)) 
                {
                    if (w3svcController.ServiceName.Equals(ServiceModelInstallStrings.W3svc, StringComparison.OrdinalIgnoreCase)) 
                    {
                        IisHelper.isIisInstalled = true;
                    }
                    else 
                    {
                        IisHelper.isIisInstalled = false; 
                    } 
                }
 
                // Only check the enable state for IIS6 or lower.
                if (IisHelper.isIisInstalled && !IisHelper.isWasInstalled)
                {
                    if (IisHelper.IsServiceEnabled(ServiceModelInstallStrings.IISAdmin)) 
                    {
                        IisHelper.isIisAdminEnabled = true; 
                    } 
                    else
                    { 
                        IisHelper.isIisAdminEnabled = false;
                    }
                }
            } 
            catch (InvalidOperationException exception)
            { 
                Win32Exception innerException = exception.InnerException as Win32Exception; 
                if (innerException == null ||
                    innerException.NativeErrorCode != ErrorCodes.ERROR_SERVICE_DOES_NOT_EXIST) 
                {
                    throw;
                }
            } 
        }
 
        static bool IsServiceEnabled(string serviceName) 
        {
            bool isServiceEnabled = false; 
            ServiceManagerHandle scManagerHandle = null;
            ServiceHandle serviceHandle = null;

            using (scManagerHandle = ServiceManagerHandle.OpenServiceManager()) 
            {
                using (serviceHandle = scManagerHandle.OpenService(serviceName, NativeMethods.SERVICE_QUERY_CONFIG)) 
                { 
                    QUERY_SERVICE_CONFIG serviceConfig = serviceHandle.QueryServiceConfig();
                    isServiceEnabled = (NativeMethods.SERVICE_DISABLED != serviceConfig.dwStartType); 
                }
            }

            return isServiceEnabled; 
        }
 
        internal static bool ShouldEnableIISAdmin 
        {
            get { return IisHelper.isIisAdminEnabled; } 
        }

        internal static bool ShouldInstallIis
        { 
            get { return IisHelper.isIisInstalled; }
        } 
 
        internal static bool ShouldInstallScriptMaps
        { 
            get
            {
                if (IisHelper.isAspNetInstalled == null)
                { 
                    IisHelper.isAspNetInstalled = false;
                    // What we do here is to check ASP.NET ScriptMaps only if W3SVC is installed, IISAdmin is enabled, 
                    // and WAS is not installed. This infers that this is for downlevel only because it cannot happen 
                    // that W3SVC & IISAdmin are installed and WAS is not installed on Vista or above.
                    if (IisHelper.isIisInstalled && IisHelper.isIisAdminEnabled && !IisHelper.isWasInstalled) 
                    {
                        IisHelper.CheckAspNetInstalled();
                    }
                } 
                return IisHelper.isAspNetInstalled.Value;
            } 
        } 

        internal static bool ShouldInstallWas 
        {
            get { return IisHelper.isWasInstalled; }
        }
 
        internal static bool ShouldInstallApplicationHost
        { 
            get { return IisHelper.isApplicationHostInstalled; } 
        }
    } 
}

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