81 lines
2.6 KiB
C#
81 lines
2.6 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 2009 Chris Morgan <chmorgan@gmail.com>
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*/
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using System;
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using PacketDotNet.Utils;
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namespace PacketDotNet
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{
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/// <summary>
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/// Internet Link layer packet
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/// See http://en.wikipedia.org/wiki/Link_Layer
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/// </summary>
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public class InternetLinkLayerPacket : Packet
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{
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// NOTE: No need to warn about lack of use, the compiler won't
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// put any calls to 'log' here but we need 'log' to exist to compile
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#pragma warning disable 0169, 0649
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private static readonly ILogInactive log;
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#pragma warning restore 0169, 0649
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/// <summary>
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/// Constructor
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/// </summary>
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public InternetLinkLayerPacket()
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{}
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/// <summary>
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/// Look for the innermost payload. This method is useful because
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/// while some packets are LinuxSSL->IpPacket or
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/// EthernetPacket->IpPacket, there are some packets that are
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/// EthernetPacket->PPPoEPacket->PPPPacket->IpPacket, and for these cases
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/// we really want to get to the IpPacket
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/// </summary>
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/// <returns>
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/// A <see cref="Packet"/>
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/// </returns>
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public static Packet GetInnerPayload(InternetLinkLayerPacket packet)
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{
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// is this an ethernet packet?
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if(packet is EthernetPacket)
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{
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log.Debug("packet is EthernetPacket");
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var thePayload = packet.PayloadPacket;
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// is this packets payload a PPPoEPacket? If so,
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// the PPPoEPacket payload should be a PPPPacket and we want
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// the payload of the PPPPpacket
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if(thePayload is PPPoEPacket)
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{
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log.Debug("thePayload is PPPoEPacket");
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return thePayload.PayloadPacket.PayloadPacket;
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}
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return thePayload;
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} else
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{
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log.Debug("else");
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return packet.PayloadPacket;
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}
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}
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}
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}
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