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//------------------------------------------------------------------------------
// <copyright file="Logging.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Net {
using System.Collections;
using System.IO;
using System.Threading;
using System.Diagnostics;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Globalization;
using Microsoft.Win32;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
[FriendAccessAllowed]
internal class Logging {
private static volatile bool s_LoggingEnabled = true;
private static volatile bool s_LoggingInitialized;
private static volatile bool s_AppDomainShutdown;
private const int DefaultMaxDumpSize = 1024;
private const bool DefaultUseProtocolTextOnly = false;
private const string AttributeNameMaxSize = "maxdatasize";
private const string AttributeNameTraceMode = "tracemode";
private static readonly string[] SupportedAttributes = new string[] { AttributeNameMaxSize, AttributeNameTraceMode };
private const string AttributeValueProtocolOnly = "protocolonly";
//private const string AttributeValueIncludeHex = "includehex";
private const string TraceSourceWebName = "System.Net";
private const string TraceSourceHttpListenerName = "System.Net.HttpListener";
private const string TraceSourceSocketsName = "System.Net.Sockets";
private const string TraceSourceWebSocketsName = "System.Net.WebSockets";
private const string TraceSourceCacheName = "System.Net.Cache";
private const string TraceSourceHttpName = "System.Net.Http";
private static TraceSource s_WebTraceSource;
private static TraceSource s_HttpListenerTraceSource;
private static TraceSource s_SocketsTraceSource;
private static TraceSource s_WebSocketsTraceSource;
private static TraceSource s_CacheTraceSource;
private static TraceSource s_TraceSourceHttpName;
private Logging() {
}
private static object s_InternalSyncObject;
private static object InternalSyncObject {
get {
if (s_InternalSyncObject == null) {
object o = new Object();
Interlocked.CompareExchange(ref s_InternalSyncObject, o, null);
}
return s_InternalSyncObject;
}
}
[FriendAccessAllowed]
internal static bool On {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
return s_LoggingEnabled;
}
}
internal static bool IsVerbose(TraceSource traceSource) {
return ValidateSettings(traceSource, TraceEventType.Verbose);
}
internal static TraceSource Web {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (!s_LoggingEnabled) {
return null;
}
return s_WebTraceSource;
}
}
[FriendAccessAllowed]
internal static TraceSource Http {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (!s_LoggingEnabled) {
return null;
}
return s_TraceSourceHttpName;
}
}
internal static TraceSource HttpListener {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (!s_LoggingEnabled) {
return null;
}
return s_HttpListenerTraceSource;
}
}
internal static TraceSource Sockets {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (!s_LoggingEnabled) {
return null;
}
return s_SocketsTraceSource;
}
}
internal static TraceSource RequestCache {
get {
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (!s_LoggingEnabled) {
return null;
}
return s_CacheTraceSource;
}
}
internal static TraceSource WebSockets
{
get
{
if (!s_LoggingInitialized)
{
InitializeLogging();
}
if (!s_LoggingEnabled)
{
return null;
}
return s_WebSocketsTraceSource;
}
}
private static bool GetUseProtocolTextSetting(TraceSource traceSource) {
bool useProtocolTextOnly = DefaultUseProtocolTextOnly;
if (traceSource.Attributes[AttributeNameTraceMode] == AttributeValueProtocolOnly) {
useProtocolTextOnly = true;
}
return useProtocolTextOnly;
}
private static int GetMaxDumpSizeSetting(TraceSource traceSource) {
int maxDumpSize = DefaultMaxDumpSize;
if (traceSource.Attributes.ContainsKey(AttributeNameMaxSize)) {
try {
maxDumpSize = Int32.Parse(traceSource.Attributes[AttributeNameMaxSize], NumberFormatInfo.InvariantInfo);
} catch (Exception exception) {
if (exception is ThreadAbortException || exception is StackOverflowException || exception is OutOfMemoryException) {
throw;
}
traceSource.Attributes[AttributeNameMaxSize] = maxDumpSize.ToString(NumberFormatInfo.InvariantInfo);
}
}
return maxDumpSize;
}
/// <devdoc>
/// <para>Sets up internal config settings for logging. (MUST be called under critsec) </para>
/// </devdoc>
private static void InitializeLogging() {
lock(InternalSyncObject) {
if (!s_LoggingInitialized) {
bool loggingEnabled = false;
s_WebTraceSource = new NclTraceSource(TraceSourceWebName);
s_HttpListenerTraceSource = new NclTraceSource(TraceSourceHttpListenerName);
s_SocketsTraceSource = new NclTraceSource(TraceSourceSocketsName);
s_WebSocketsTraceSource = new NclTraceSource(TraceSourceWebSocketsName);
s_CacheTraceSource = new NclTraceSource(TraceSourceCacheName);
s_TraceSourceHttpName = new NclTraceSource(TraceSourceHttpName);
GlobalLog.Print("Initalizating tracing");
try {
loggingEnabled = (s_WebTraceSource.Switch.ShouldTrace(TraceEventType.Critical) ||
s_HttpListenerTraceSource.Switch.ShouldTrace(TraceEventType.Critical) ||
s_SocketsTraceSource.Switch.ShouldTrace(TraceEventType.Critical) ||
s_WebSocketsTraceSource.Switch.ShouldTrace(TraceEventType.Critical) ||
s_CacheTraceSource.Switch.ShouldTrace(TraceEventType.Critical) ||
s_TraceSourceHttpName.Switch.ShouldTrace(TraceEventType.Critical));
}
catch (SecurityException) {
// These may throw if the caller does not have permission to hook up trace listeners.
// We treat this case as though logging were disabled.
Close();
loggingEnabled = false;
}
if (loggingEnabled) {
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.UnhandledException += new UnhandledExceptionEventHandler(UnhandledExceptionHandler);
currentDomain.DomainUnload += new EventHandler(AppDomainUnloadEvent);
currentDomain.ProcessExit += new EventHandler(ProcessExitEvent);
}
s_LoggingEnabled = loggingEnabled;
s_LoggingInitialized = true;
}
}
}
[SuppressMessage("Microsoft.Security","CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Justification="Logging functions must work in partial trust mode")]
private static void Close() {
if (s_WebTraceSource != null) s_WebTraceSource.Close();
if (s_HttpListenerTraceSource != null) s_HttpListenerTraceSource.Close();
if (s_SocketsTraceSource != null) s_SocketsTraceSource.Close();
if (s_WebSocketsTraceSource != null) s_WebSocketsTraceSource.Close();
if (s_CacheTraceSource != null) s_CacheTraceSource.Close();
if (s_TraceSourceHttpName != null) s_TraceSourceHttpName.Close();
}
/// <devdoc>
/// <para>Logs any unhandled exception through this event handler</para>
/// </devdoc>
private static void UnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs args) {
Exception e = (Exception) args.ExceptionObject;
Exception(Web, sender, "UnhandledExceptionHandler", e);
}
private static void ProcessExitEvent(object sender, EventArgs e) {
Close();
s_AppDomainShutdown = true;
}
/// <devdoc>
/// <para>Called when the system is shutting down, used to prevent additional logging post-shutdown</para>
/// </devdoc>
private static void AppDomainUnloadEvent(object sender, EventArgs e) {
Close();
s_AppDomainShutdown = true;
}
/// <devdoc>
/// <para>Confirms logging is enabled, given current logging settings</para>
/// </devdoc>
private static bool ValidateSettings(TraceSource traceSource, TraceEventType traceLevel) {
if (!s_LoggingEnabled) {
return false;
}
if (!s_LoggingInitialized) {
InitializeLogging();
}
if (traceSource == null || !traceSource.Switch.ShouldTrace(traceLevel)) {
return false;
}
if (s_AppDomainShutdown) {
return false;
}
return true;
}
/// <devdoc>
/// <para>Converts an object to a normalized string that can be printed
/// takes System.Net.ObjectNamedFoo and coverts to ObjectNamedFoo,
/// except IPAddress, IPEndPoint, and Uri, which return ToString()
/// </para>
/// </devdoc>
private static string GetObjectName(object obj) {
if (obj is Uri || obj is System.Net.IPAddress || obj is System.Net.IPEndPoint) {
return obj.ToString();
} else {
return obj.GetType().Name;
}
}
internal static uint GetThreadId()
{
uint threadId = UnsafeNclNativeMethods.GetCurrentThreadId();
if (threadId == 0) {
threadId = (uint)Thread.CurrentThread.GetHashCode();
}
return threadId;
}
internal static void PrintLine(TraceSource traceSource, TraceEventType eventType, int id, string msg) {
string logHeader = "["+GetThreadId().ToString("d4", CultureInfo.InvariantCulture)+"] " ;
traceSource.TraceEvent(eventType, id, logHeader + msg);
}
/// <devdoc>
/// <para>Indicates that two objects are getting used with one another</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Associate(TraceSource traceSource, object objA, object objB) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
string lineA = GetObjectName(objA) + "#" + ValidationHelper.HashString(objA);
string lineB = GetObjectName(objB) + "#" + ValidationHelper.HashString(objB);
PrintLine(traceSource, TraceEventType.Information, 0, "Associating " + lineA + " with " + lineB);
}
/// <devdoc>
/// <para>Logs entrance to a function</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Enter(TraceSource traceSource, object obj, string method, string param) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Enter(traceSource, GetObjectName(obj)+"#"+ValidationHelper.HashString(obj), method, param);
}
/// <devdoc>
/// <para>Logs entrance to a function</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Enter(TraceSource traceSource, object obj, string method, object paramObject) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Enter(traceSource, GetObjectName(obj)+"#"+ValidationHelper.HashString(obj), method, paramObject);
}
/// <devdoc>
/// <para>Logs entrance to a function</para>
/// </devdoc>
internal static void Enter(TraceSource traceSource, string obj, string method, string param) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Enter(traceSource, obj +"::"+method+"("+param+")");
}
/// <devdoc>
/// <para>Logs entrance to a function</para>
/// </devdoc>
internal static void Enter(TraceSource traceSource, string obj, string method, object paramObject) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
string paramObjectValue = "";
if (paramObject != null) {
paramObjectValue = GetObjectName(paramObject) + "#" + ValidationHelper.HashString(paramObject);
}
Enter(traceSource, obj +"::"+method+"("+paramObjectValue+")");
}
/// <devdoc>
/// <para>Logs entrance to a function, indents and points that out</para>
/// </devdoc>
internal static void Enter(TraceSource traceSource, string method, string parameters) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Enter(traceSource, method+"("+parameters+")");
}
/// <devdoc>
/// <para>Logs entrance to a function, indents and points that out</para>
/// </devdoc>
internal static void Enter(TraceSource traceSource, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
// Trace.CorrelationManager.StartLogicalOperation();
PrintLine(traceSource, TraceEventType.Verbose, 0, "Entering " + msg);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Exit(TraceSource traceSource, object obj, string method, object retObject) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
string retValue = "";
if (retObject != null) {
retValue = GetObjectName(retObject)+ "#" + ValidationHelper.HashString(retObject);
}
Exit(traceSource, obj, method, retValue);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
internal static void Exit(TraceSource traceSource, string obj, string method, object retObject) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
string retValue = "";
if (retObject != null) {
retValue = GetObjectName(retObject) + "#" + ValidationHelper.HashString(retObject);
}
Exit(traceSource, obj, method, retValue);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Exit(TraceSource traceSource, object obj, string method, string retValue) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Exit(traceSource, GetObjectName(obj)+"#"+ValidationHelper.HashString(obj), method, retValue);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
internal static void Exit(TraceSource traceSource, string obj, string method, string retValue) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
if (!ValidationHelper.IsBlankString(retValue)) {
retValue = "\t-> " + retValue;
}
Exit(traceSource, obj+"::"+method+"() "+retValue);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
internal static void Exit(TraceSource traceSource, string method, string parameters) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
Exit(traceSource, method+"() "+parameters);
}
/// <devdoc>
/// <para>Logs exit from a function</para>
/// </devdoc>
internal static void Exit(TraceSource traceSource, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
PrintLine(traceSource, TraceEventType.Verbose, 0, "Exiting "+msg);
// Trace.CorrelationManager.StopLogicalOperation();
}
/// <devdoc>
/// <para>Logs Exception, restores indenting</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void Exception(TraceSource traceSource, object obj, string method, Exception e) {
if (!ValidateSettings(traceSource, TraceEventType.Error)) {
return;
}
string infoLine = SR.GetString(SR.net_log_exception, GetObjectLogHash(obj), method, e.Message);
if (!ValidationHelper.IsBlankString(e.StackTrace)) {
infoLine += "\r\n" + e.StackTrace;
}
PrintLine(traceSource, TraceEventType.Error, 0, infoLine);
}
/// <devdoc>
/// <para>Logs an Info line</para>
/// </devdoc>
internal static void PrintInfo(TraceSource traceSource, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
PrintLine(traceSource, TraceEventType.Information, 0, msg);
}
/// <devdoc>
/// <para>Logs an Info line</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void PrintInfo(TraceSource traceSource, object obj, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
PrintLine(traceSource, TraceEventType.Information, 0,
GetObjectName(obj)+"#"+ValidationHelper.HashString(obj)
+" - "+msg);
}
/// <devdoc>
/// <para>Logs an Info line</para>
/// </devdoc>
internal static void PrintInfo(TraceSource traceSource, object obj, string method, string param) {
if (!ValidateSettings(traceSource, TraceEventType.Information)) {
return;
}
PrintLine(traceSource, TraceEventType.Information, 0,
GetObjectName(obj)+"#"+ValidationHelper.HashString(obj)
+"::"+method+"("+param+")");
}
/// <devdoc>
/// <para>Logs a Warning line</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void PrintWarning(TraceSource traceSource, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Warning)) {
return;
}
PrintLine(traceSource, TraceEventType.Warning, 0, msg);
}
/// <devdoc>
/// <para>Logs a Warning line</para>
/// </devdoc>
internal static void PrintWarning(TraceSource traceSource, object obj, string method, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Warning)) {
return;
}
PrintLine(traceSource, TraceEventType.Warning, 0,
GetObjectName(obj)+"#"+ValidationHelper.HashString(obj)
+"::"+method+"() - "+msg);
}
/// <devdoc>
/// <para>Logs an Error line</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void PrintError(TraceSource traceSource, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Error)) {
return;
}
PrintLine(traceSource, TraceEventType.Error, 0, msg);
}
/// <devdoc>
/// <para>Logs an Error line</para>
/// </devdoc>
[FriendAccessAllowed]
internal static void PrintError(TraceSource traceSource, object obj, string method, string msg) {
if (!ValidateSettings(traceSource, TraceEventType.Error)) {
return;
}
PrintLine(traceSource, TraceEventType.Error, 0,
GetObjectName(obj)+"#"+ValidationHelper.HashString(obj)
+"::"+method+"() - "+msg);
}
[FriendAccessAllowed]
internal static string GetObjectLogHash(object obj)
{
return GetObjectName(obj) + "#" + ValidationHelper.HashString(obj);
}
/// <devdoc>
/// <para>Marhsalls a buffer ptr to an array and then dumps the byte array to the log</para>
/// </devdoc>
internal static void Dump(TraceSource traceSource, object obj, string method, IntPtr bufferPtr, int length) {
if (!ValidateSettings(traceSource, TraceEventType.Verbose) || bufferPtr == IntPtr.Zero || length < 0) {
return;
}
byte [] buffer = new byte[length];
Marshal.Copy(bufferPtr, buffer, 0, length);
Dump(traceSource, obj, method, buffer, 0, length);
}
/// <devdoc>
/// <para>Dumps a byte array to the log</para>
/// </devdoc>
internal static void Dump(TraceSource traceSource, object obj, string method, byte[] buffer, int offset, int length) {
if (!ValidateSettings(traceSource, TraceEventType.Verbose)) {
return;
}
if (buffer == null) {
PrintLine(traceSource, TraceEventType.Verbose, 0, "(null)");
return;
}
if (offset > buffer.Length) {
PrintLine(traceSource, TraceEventType.Verbose, 0, "(offset out of range)");
return;
}
PrintLine(traceSource, TraceEventType.Verbose, 0, "Data from "+GetObjectName(obj)+"#"+ValidationHelper.HashString(obj) +"::"+method);
int maxDumpSize = GetMaxDumpSizeSetting(traceSource);
if (length > maxDumpSize) {
PrintLine(traceSource, TraceEventType.Verbose, 0, "(printing " + maxDumpSize.ToString(NumberFormatInfo.InvariantInfo) + " out of " + length.ToString(NumberFormatInfo.InvariantInfo) + ")");
length = maxDumpSize;
}
if ((length < 0) || (length > buffer.Length - offset)) {
length = buffer.Length - offset;
}
if (GetUseProtocolTextSetting(traceSource)) {
string output = "<<" + WebHeaderCollection.HeaderEncoding.GetString(buffer, offset, length) + ">>";
PrintLine(traceSource, TraceEventType.Verbose, 0, output);
return;
}
do {
int n = Math.Min(length, 16);
string disp = String.Format(CultureInfo.CurrentCulture, "{0:X8} : ", offset);
for (int i = 0; i < n; ++i) {
disp += String.Format(CultureInfo.CurrentCulture, "{0:X2}", buffer[offset + i]) + ((i == 7) ? '-' : ' ');
}
for (int i = n; i < 16; ++i) {
disp += " ";
}
disp += ": ";
for (int i = 0; i < n; ++i) {
disp += ((buffer[offset + i] < 0x20) || (buffer[offset + i] > 0x7e))
? '.'
: (char)(buffer[offset + i]);
}
PrintLine(traceSource, TraceEventType.Verbose, 0, disp);
offset += n;
length -= n;
} while (length > 0);
}
private class NclTraceSource : TraceSource
{
internal NclTraceSource(string name) : base(name) { }
protected internal override string[] GetSupportedAttributes()
{
return Logging.SupportedAttributes;
}
}
}
}
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