Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / NetworkInformation / NetworkInformationPermission.cs / 1 / NetworkInformationPermission.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.NetworkInformation { using System.Collections; using System.Security; using System.Security.Permissions; using System.Globalization; using System.Threading; [Flags] public enum NetworkInformationAccess {None = 0, Read=1, Ping = 4}; [ AttributeUsage( AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false )] [Serializable] public sealed class NetworkInformationPermissionAttribute: CodeAccessSecurityAttribute { private const string strAccess = "Access"; private string access = null; public NetworkInformationPermissionAttribute( SecurityAction action ): base( action ) { } public string Access{ get{ return access; } set{ access = value; } } public override IPermission CreatePermission() { NetworkInformationPermission perm = null; if (Unrestricted) { perm = new NetworkInformationPermission(PermissionState.Unrestricted); } else { perm = new NetworkInformationPermission(PermissionState.None); if (access != null) { if (0 == string.Compare(access, "Read", StringComparison.OrdinalIgnoreCase)) { perm.AddPermission(NetworkInformationAccess.Read); } else if (0 == string.Compare(access, "Ping", StringComparison.OrdinalIgnoreCase)) { perm.AddPermission(NetworkInformationAccess.Ping); } else if (0 == string.Compare(access, "None", StringComparison.OrdinalIgnoreCase)) { perm.AddPermission(NetworkInformationAccess.None); } else { throw new ArgumentException(SR.GetString(SR.net_perm_invalid_val, strAccess, access)); } } } return perm; } } [Serializable] public sealed class NetworkInformationPermission : CodeAccessPermission, IUnrestrictedPermission { NetworkInformationAccess access; bool unrestricted; public NetworkInformationPermission(PermissionState state) { if (state == PermissionState.Unrestricted){ access = NetworkInformationAccess.Read | NetworkInformationAccess.Ping; unrestricted = true; } else{ access = NetworkInformationAccess.None; } } internal NetworkInformationPermission(bool unrestricted) { if (unrestricted){ access = NetworkInformationAccess.Read | NetworkInformationAccess.Ping; unrestricted = true; } else{ access = NetworkInformationAccess.None; } } public NetworkInformationPermission(NetworkInformationAccess access) { this.access = access; } public NetworkInformationAccess Access{ get{ return access; } } public void AddPermission(NetworkInformationAccess access) { this.access|=access; } public bool IsUnrestricted() { return unrestricted; } public override IPermission Copy() { if(unrestricted){ return new NetworkInformationPermission(true); } return new NetworkInformationPermission(access); } public override IPermission Union(IPermission target) { if (target==null) { return this.Copy(); } NetworkInformationPermission other = target as NetworkInformationPermission; if(other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } if(unrestricted || other.IsUnrestricted()){ return new NetworkInformationPermission(true); } return new NetworkInformationPermission(this.access | other.access); } public override IPermission Intersect(IPermission target) { if (target == null) { return null; } NetworkInformationPermission other = target as NetworkInformationPermission; if(other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } if(unrestricted && other.IsUnrestricted()){ return new NetworkInformationPermission(true); } return new NetworkInformationPermission(access & other.access); } public override bool IsSubsetOf(IPermission target) { // Pattern suggested by security engine if (target == null) { return (access == NetworkInformationAccess.None); } NetworkInformationPermission other = target as NetworkInformationPermission; if (other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } if(unrestricted && !other.IsUnrestricted()){ return false; } else if ((access & other.access) == access) { return true; } return false; } public override void FromXml(SecurityElement securityElement) { access = NetworkInformationAccess.None; if (securityElement == null) { throw new ArgumentNullException("securityElement"); } if (!securityElement.Tag.Equals("IPermission")) { throw new ArgumentException(SR.GetString(SR.net_not_ipermission), "securityElement"); } string className = securityElement.Attribute("class"); if (className == null) { throw new ArgumentException(SR.GetString(SR.net_no_classname), "securityElement"); } if (className.IndexOf(this.GetType().FullName) < 0) { throw new ArgumentException(SR.GetString(SR.net_no_typename), "securityElement"); } String str = securityElement.Attribute("Unrestricted"); if (str != null) { if (0 == string.Compare( str, "true", StringComparison.OrdinalIgnoreCase)){ access = NetworkInformationAccess.Read | NetworkInformationAccess.Ping; unrestricted = true; return; } } if(securityElement.Children != null) { foreach(SecurityElement child in securityElement.Children) { str = child.Attribute("Access"); if(0 == string.Compare(str, "Read", StringComparison.OrdinalIgnoreCase)){ access |= NetworkInformationAccess.Read; } else if(0 == string.Compare(str, "Ping", StringComparison.OrdinalIgnoreCase)){ access |= NetworkInformationAccess.Ping; } } } } public override SecurityElement ToXml() { SecurityElement securityElement = new SecurityElement( "IPermission" ); securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace( '\"', '\'' )); securityElement.AddAttribute("version", "1"); if(unrestricted){ securityElement.AddAttribute("Unrestricted", "true"); return securityElement; } if ((access & NetworkInformationAccess.Read) > 0) { SecurityElement child = new SecurityElement("NetworkInformationAccess"); child.AddAttribute( "Access", "Read"); securityElement.AddChild(child); } if ((access & NetworkInformationAccess.Ping) > 0) { SecurityElement child = new SecurityElement("NetworkInformationAccess"); child.AddAttribute( "Access", "Ping"); securityElement.AddChild(child); } return securityElement; } }// class NetworkInformationPermission } // namespace System.Net
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