117 lines
3.7 KiB
C#
117 lines
3.7 KiB
C#
/*
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This file is part of PacketDotNet
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PacketDotNet is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PacketDotNet is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PacketDotNet. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copyright 2012 Alan Rushforth <alan.rushforth@gmail.com>
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using PacketDotNet.Utils;
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using System.Net.NetworkInformation;
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namespace PacketDotNet
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{
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namespace Ieee80211
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{
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/// <summary>
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/// Format of an ACK frame
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/// </summary>
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public class AckFrame : MacFrame
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{
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/// <summary>
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/// Receiver address
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/// </summary>
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public PhysicalAddress ReceiverAddress {get; set;}
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/// <summary>
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/// Length of the frame
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/// </summary>
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override public int FrameSize
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{
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get
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{
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return (MacFields.FrameControlLength +
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MacFields.DurationIDLength +
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MacFields.AddressLength);
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}
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}
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="bas">
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/// A <see cref="ByteArraySegment"/>
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/// </param>
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public AckFrame (ByteArraySegment bas)
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{
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header = new ByteArraySegment (bas);
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FrameControl = new FrameControlField (FrameControlBytes);
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Duration = new DurationField (DurationBytes);
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ReceiverAddress = GetAddress(0);
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header.Length = FrameSize;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="PacketDotNet.Ieee80211.AckFrame"/> class.
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/// </summary>
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/// <param name='ReceiverAddress'>
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/// Receiver address.
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/// </param>
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public AckFrame (PhysicalAddress ReceiverAddress)
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{
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this.FrameControl = new FrameControlField ();
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this.Duration = new DurationField ();
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this.ReceiverAddress = ReceiverAddress;
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this.FrameControl.SubType = FrameControlField.FrameSubTypes.ControlACK;
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}
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/// <summary>
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/// Writes the current packet properties to the backing ByteArraySegment.
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/// </summary>
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public override void UpdateCalculatedValues ()
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{
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if ((header == null) || (header.Length > (header.BytesLength - header.Offset)) || (header.Length < FrameSize))
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{
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header = new ByteArraySegment (new Byte[FrameSize]);
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}
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this.FrameControlBytes = this.FrameControl.Field;
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this.DurationBytes = this.Duration.Field;
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SetAddress (0, ReceiverAddress);
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}
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/// <summary>
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/// Returns a string with a description of the addresses used in the packet.
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/// This is used as a compoent of the string returned by ToString().
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/// </summary>
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/// <returns>
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/// The address string.
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/// </returns>
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protected override String GetAddressString()
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{
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return String.Format("RA {0}", ReceiverAddress);
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}
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}
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}
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}
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