HttpDebugHandler.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / xsp / System / Web / HttpDebugHandler.cs / 1 / HttpDebugHandler.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Handler for DEBUG verb 
 *
 * Copyright (c) 2000 Microsoft Corporation 
 */

namespace System.Web {
 
    using System.Configuration;
    using System.Globalization; 
    using System.IO; 
    using System.Runtime.InteropServices;
    using System.Text; 
    using System.Web.Configuration;
    using System.Web.Hosting;
    using System.Web.Util;
/* 
This is just a temporary code to get some timings for the Http Debug request.  To enable it, add the following
to the app's "web.config" file: 
 

 
        
            
        
 
        
            
            
        
 


*/
    using System.Collections; 

#if PERF 
 
    internal class HttpDebugHandlerTimeLog {
        private static int initialTick = 0; 
        private static int isEnabled = -1;
        private static StreamWriter writer = null;
        private static FileStream fstream = null;
 
        private HttpDebugHandlerTimeLog() {
        } 
 
        private static bool IsEnabled {
            get { 
                if (isEnabled == -1) {
                    // Else
                    Hashtable h = (Hashtable) WebConfigurationManager.GetWebApplicationSection("httpDebug");
                    if (h != null) { 
                        string s = (string) h["enable"];
                        if ((s != null) && (s == "1")) { 
                            // Open file handle if needed 
                            try {
                                string filename = (string) h["path"]; 
                                if (filename != null) {
                                    fstream = new FileStream(filename, FileMode.Create, FileAccess.ReadWrite, FileShare.Read);
                                    writer = new StreamWriter(fstream);
                                    isEnabled = 1; 
                                }
                            } 
                            catch { 
                                isEnabled = 0;
                                Close(); 
                            }
                        }
                    }
 
                    // If still undecided here, then it's off
                    if (isEnabled == -1) { 
                        isEnabled = 0; 
                    }
                } 

                return (isEnabled == 1) ? true : false;
            }
        } 

        internal static void Close() { 
            if (writer != null) { 
                writer.Flush();
                writer.Close(); 
                writer = null;
            }
            if (fstream != null) {
                fstream.Close(); 
                fstream = null;
            } 
        } 

        internal static void PrintTickDelta(string s) { 
            if (! IsEnabled) {
                return;
            }
            if (initialTick == 0) { 
                initialTick = Environment.TickCount;
                SafeNativeMethods.OutputDebugString(s + " : " + initialTick + " (HttpDebugHandler + 0)\n"); 
                if (writer != null) { 
                    writer.WriteLine(s + " : " + initialTick + " (HttpDebugHandler + 0)");
                } 
            }
            else {
                int curTick = Environment.TickCount;
                SafeNativeMethods.OutputDebugString(s + " : " + curTick + " (HttpDebugHandler + " + (curTick - initialTick) + ")\n"); 
                if (writer != null) {
                    writer.WriteLine(s + " : " + curTick + " (HttpDebugHandler + " + (curTick - initialTick) + ")"); 
                } 
            }
        } 
    }

#endif
 
    /// 
    ///    Handler for debugging operations. 
    ///  
    internal class HttpDebugHandler : IHttpHandler {
 
        private static string[] validClsIds = {"{70f65411-fe8c-4248-bcff-701c8b2f4529}",
                                               "{62a78ac2-7d9a-4377-b97e-6965919fdd02}",
                                               "{cc23651f-4574-438f-b4aa-bcb28b6b3ecf}",
                                               "{dbfdb1d0-04a4-4315-b15c-f874f6b6e90b}", 
                                               "{a4fcb474-2687-4924-b0ad-7caf331db826}",
                                               "{beb261f6-d5f0-43ba-baf4-8b79785fffaf}", 
                                               "{8e2f5e28-d4e2-44c0-aa02-f8c5beb70cac}", 
                                               "{08100915-0f41-4ccf-9564-ebaa5d49446c}"};
 
        internal HttpDebugHandler () {
        }

 
        /// 
        ///    Drives web processing execution. 
        ///  
        public void ProcessRequest(HttpContext context) {
            // Debugging must be enabled 

            try {
#if PERF
                HttpDebugHandlerTimeLog.PrintTickDelta("Entered HttpDebugHandler"); 
#endif
 
                if (!HttpRuntime.DebuggingEnabled) { 
                    context.Response.Write(SR.GetString(SR.Debugging_forbidden, context.Request.Path));
                    context.Response.StatusCode = 403; 
                    return;
                }

                // Check to see if it's a valid debug command. 
                string command = context.Request.Headers["Command"];
 
                if (command == null) { 
                    Debug.Trace("AutoAttach", "No debug command!!");
                    context.Response.Write(SR.GetString(SR.Invalid_Debug_Request)); 
                    context.Response.StatusCode = 500;
                    return;
                }
 
                Debug.Trace("AutoAttach", "Debug command: " + command);
 
                if (StringUtil.EqualsIgnoreCase(command, "stop-debug")) { 
                    context.Response.Write("OK");
                    return; 
                }

                if (!StringUtil.EqualsIgnoreCase(command, "start-debug")) {
                    context.Response.Write(SR.GetString(SR.Invalid_Debug_Request)); 
                    context.Response.StatusCode = 500;
                    return; 
                } 

                // Request must be NTLM authenticated 
                string authType = context.WorkerRequest.GetServerVariable("AUTH_TYPE"); // go the metal
                string logonUser  = context.WorkerRequest.GetServerVariable("LOGON_USER");

                Debug.Trace("AutoAttach", "Authentication type string: " + ((authType != null) ? authType : "NULL")); 
                Debug.Trace("AutoAttach", "Logon user string: " + ((logonUser != null) ? logonUser : "NULL"));
 
                if (String.IsNullOrEmpty(logonUser) || String.IsNullOrEmpty(authType) || StringUtil.EqualsIgnoreCase(authType, "basic")) 
                {
                    Debug.Trace("AutoAttach", "Invalid logon_user or auth_type string."); 
                    context.Response.Write(SR.GetString(SR.Debug_Access_Denied, context.Request.Path));
                    context.Response.StatusCode = 401;
                    return;
                } 

                // Get the session ID 
                String sessId = context.Request.Form["DebugSessionID"]; 

                Debug.Trace("AutoAttach", "DebugSessionID: " + ((sessId != null) ? sessId : "NULL")); 

                if (String.IsNullOrEmpty(sessId)) {
                    context.Response.Write(SR.GetString(SR.Invalid_Debug_ID));
                    context.Response.StatusCode = 500; 
                    return;
                } 
 
                string s = sessId.Replace(';', '&');
 
                HttpValueCollection valCol = new HttpValueCollection(s, true, true, Encoding.UTF8);
                string clsId = (string) valCol["autoattachclsid"];

                // Verify clsId 
                bool isClsIdOk = false;
                if (clsId != null) { 
                    for (int i = 0; i < validClsIds.Length; i++) { 
                        if (StringUtil.EqualsIgnoreCase(clsId, validClsIds[i])) {
                            isClsIdOk = true; 
                            break;
                        }
                    }
                } 
                if (isClsIdOk == false) {
                    context.Response.Write(SR.GetString(SR.Debug_Access_Denied, context.Request.Path)); 
                    context.Response.StatusCode = 401; 
                    Debug.Trace("AutoAttach", "Debug attach not attempted because of invalid CLSID.");
                    return; 
                }

                // Attach the debugger
#if PERF 
                HttpDebugHandlerTimeLog.PrintTickDelta("About to call into MDM");
#endif 
 
                int rc = UnsafeNativeMethods.AttachDebugger(clsId, sessId, context.WorkerRequest.GetUserToken());
 
#if PERF
                HttpDebugHandlerTimeLog.PrintTickDelta("Returned from call to MDM");
#endif
 
                // If it's not S_OK, then we got a problem
                if (rc != 0) { 
                    Debug.Trace("AutoAttach", "Debug attach failed! Return code: " + rc); 
                    context.Response.Write(SR.GetString(SR.Error_Attaching_with_MDM, "0x" + rc.ToString("X8", CultureInfo.InvariantCulture)));
                    context.Response.StatusCode = 500; 
                    return;
                }

                Debug.Trace("AutoAttach", "Debug attach successful!"); 

                // Everything ok -- increment counter, return something (not 204) 
                PerfCounters.IncrementCounter(AppPerfCounter.DEBUGGING_REQUESTS); 
                context.Response.Write("OK");
            } 
            finally {
                Debug.Trace("AutoAttach","Http Debug attach done!");

#if PERF 
                HttpDebugHandlerTimeLog.PrintTickDelta("Leaving HttpDebugHandler");
                HttpDebugHandlerTimeLog.Close(); 
#endif 
            }
        } 


        /// 
        ///    Indicates whether an HttpDebugHandler instance can be recycled and used for 
        ///       another request.
        ///  
        public bool IsReusable { 
            get { return true; }
        } 
    }

}
 

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