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//------------------------------------------------------------------------------
// <copyright file="ConfigurationFileMap.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System;
using System.IO;
using System.Security.Permissions;
namespace System.Configuration {
//
// Holds the configuration file mapping for
// machine.config. It is the base class for
// ExeConfigurationFileMap and WebConfigurationFileMap.
//
public class ConfigurationFileMap : ICloneable {
// DevDiv #407902 - This used to be two fields: one containing the filename and the other containing
// a Boolean dictating whether a security check needed to take place. Such a pattern wasn't thread-safe
// and could be circumvented by malicious callers. Using a single reference field is guaranteed atomic
// read and write across all platforms, so the race condition is eliminated.
private Func<string> _getFilenameThunk;
public ConfigurationFileMap() {
_getFilenameThunk = GetFilenameFromMachineConfigFilePath;
}
public ConfigurationFileMap(string machineConfigFilename) {
if (string.IsNullOrEmpty(machineConfigFilename))
throw new ArgumentNullException("machineConfigFilename");
if (!File.Exists(machineConfigFilename))
throw new ArgumentException(SR.GetString(SR.Machine_config_file_not_found, machineConfigFilename), "machineConfigFilename");
MachineConfigFilename = machineConfigFilename;
}
// copy ctor used only for cloning
private ConfigurationFileMap(ConfigurationFileMap other) {
_getFilenameThunk = other._getFilenameThunk;
}
public virtual object Clone() {
return new ConfigurationFileMap(this);
}
private static string GetFilenameFromMachineConfigFilePath() {
string filename = ClientConfigurationHost.MachineConfigFilePath;
new FileIOPermission(FileIOPermissionAccess.PathDiscovery, filename).Demand();
return filename;
}
//
// The name of machine.config.
//
public string MachineConfigFilename {
get {
return _getFilenameThunk();
}
set {
_getFilenameThunk = () => value;
}
}
}
}
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