/*
 * Process Hacker - 
 *   remote handle
 * 
 * Copyright (C) 2008 wj32
 * 
 * This file is part of Process Hacker.
 * 
 * Process Hacker is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Process Hacker is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Process Hacker.  If not, see <http://www.gnu.org/licenses/>.
 */

using System;
using System.Runtime.InteropServices;

namespace ProcessHacker
{
    public partial class Win32
    {
        /// <summary>
        /// Represents a handle owned by another process.
        /// </summary>
        public class RemoteHandle
        {
            private ProcessHandle _phandle;
            private int _handle;

            public RemoteHandle(ProcessHandle phandle, int handle)
            {
                _phandle = phandle;
                _handle = handle;
            }

            /// <summary>
            /// Duplicates the handle owned by the process.
            /// </summary>
            /// <param name="rights">The desired access to the handle's object.</param>
            /// <returns>A local copy of the handle.</returns>
            /// <remarks>
            /// We can't use a template for this because of C#'s rules for template 
            /// restrictions. Specifically, we can only specify that the type must have a
            /// constructor with 0 arguments, but no more.
            /// </remarks>
            public int GetHandle(int rights)
            {
                int new_handle = 0;

                if (ZwDuplicateObject(_phandle.Handle, _handle,
                    Program.CurrentProcess, out new_handle,
                    (STANDARD_RIGHTS)rights, 0, 0) != 0)
                    throw new Exception("Could not duplicate token handle!");

                return new_handle;
            }
        }
    }
}