Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / DnsPermission.cs / 1 / DnsPermission.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System.Security; using System.Security.Permissions; using System.Globalization; //NOTE: While DnsPermissionAttribute resides in System.DLL, // no classes from that DLL are able to make declarative usage of DnsPermission. [ AttributeUsage( AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false )] [Serializable()] sealed public class DnsPermissionAttribute : CodeAccessSecurityAttribute { public DnsPermissionAttribute ( SecurityAction action ): base( action ) { } public override IPermission CreatePermission() { if (Unrestricted) { return new DnsPermission( PermissionState.Unrestricted); } else { return new DnsPermission( PermissionState.None); } } } ////// [Serializable] public sealed class DnsPermission : CodeAccessPermission, IUnrestrictedPermission { private bool m_noRestriction; ////// ////// public DnsPermission(PermissionState state) { m_noRestriction = (state==PermissionState.Unrestricted); } internal DnsPermission(bool free) { m_noRestriction = free; } // IUnrestrictedPermission interface methods ////// Creates a new instance of the ////// class that passes all demands or that fails all demands. /// /// public bool IsUnrestricted() { return m_noRestriction; } // IPermission interface methods ////// Checks the overall permission state of the object. /// ////// public override IPermission Copy () { return new DnsPermission(m_noRestriction); } ////// Creates a copy of a ///instance. /// /// public override IPermission Union(IPermission target) { // Pattern suggested by Security engine if (target==null) { return this.Copy(); } DnsPermission other = target as DnsPermission; if(other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } return new DnsPermission(m_noRestriction || other.m_noRestriction); } ///Returns the logical union between two ///instances. /// public override IPermission Intersect(IPermission target) { // Pattern suggested by Security engine if (target==null) { return null; } DnsPermission other = target as DnsPermission; if(other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } // return null if resulting permission is restricted and empty // Hence, the only way for a bool permission will be. if (this.m_noRestriction && other.m_noRestriction) { return new DnsPermission(true); } return null; } ///Returns the logical intersection between two ///instances. /// public override bool IsSubsetOf(IPermission target) { // Pattern suggested by Security engine if (target == null) { return m_noRestriction == false; } DnsPermission other = target as DnsPermission; if (other == null) { throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); } //Here is the matrix of result based on m_noRestriction for me and she // me.noRestriction she.noRestriction me.isSubsetOf(she) // 0 0 1 // 0 1 1 // 1 0 0 // 1 1 1 return (!m_noRestriction || other.m_noRestriction); } ///Compares two ///instances. /// public override void FromXml(SecurityElement securityElement) { if (securityElement == null) { // // null SecurityElement // throw new ArgumentNullException("securityElement"); } if (!securityElement.Tag.Equals("IPermission")) { // // SecurityElement must be a permission element // throw new ArgumentException(SR.GetString(SR.net_no_classname), "securityElement"); } string className = securityElement.Attribute( "class" ); if (className == null) { // // SecurityElement must be a permission element for this type // throw new ArgumentException(SR.GetString(SR.net_no_classname), "securityElement"); } if (className.IndexOf( this.GetType().FullName ) < 0) { // // SecurityElement must be a permission element for this type // throw new ArgumentException(SR.GetString(SR.net_no_typename), "securityElement"); } string str = securityElement.Attribute( "Unrestricted" ); m_noRestriction = (str!=null?(0 == string.Compare( str, "true", StringComparison.OrdinalIgnoreCase)):false); } ////// 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 (m_noRestriction) { securityElement.AddAttribute( "Unrestricted", "true" ); } return securityElement; } } // class DnsPermission } // namespace System.Net[To be supplied.] ///
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