86 lines
4.4 KiB
C#
86 lines
4.4 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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namespace PacketDotNet
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{
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/// <summary> IP protocol field encoding information.
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///
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/// </summary>
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/// FIXME: These fields are partially broken because they assume the offset for
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/// several fields and the offset is actually based on the accumulated offset
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/// into the structure determined by the fields that indicate sizes
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public class ARPFields
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{
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/// <summary> Type code for ethernet addresses.</summary>
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public readonly static int EthernetProtocolType = 0x0001;
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/// <summary> Type code for MAC addresses.</summary>
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public readonly static int IPv4ProtocolType = 0x0800;
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/// <summary> Operation type length in bytes.</summary>
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public readonly static int OperationLength = 2;
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/// <summary>
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/// The length of the address type fields in bytes,
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/// eg. the length of hardware type or protocol type
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/// </summary>
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public readonly static int AddressTypeLength = 2;
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/// <summary>
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/// The length of the address length fields in bytes.
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/// </summary>
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public readonly static int AddressLengthLength = 1;
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/// <summary> Position of the hardware address type.</summary>
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public readonly static int HardwareAddressTypePosition = 0;
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/// <summary> Position of the protocol address type.</summary>
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public readonly static int ProtocolAddressTypePosition;
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/// <summary> Position of the hardware address length.</summary>
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public readonly static int HardwareAddressLengthPosition;
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/// <summary> Position of the protocol address length.</summary>
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public readonly static int ProtocolAddressLengthPosition;
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/// <summary> Position of the operation type.</summary>
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public readonly static int OperationPosition;
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/// <summary> Position of the sender hardware address.</summary>
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public readonly static int SenderHardwareAddressPosition;
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/// <summary> Position of the sender protocol address.</summary>
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public readonly static int SenderProtocolAddressPosition;
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/// <summary> Position of the target hardware address.</summary>
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public readonly static int TargetHardwareAddressPosition;
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/// <summary> Position of the target protocol address.</summary>
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public readonly static int TargetProtocolAddressPosition;
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/// <summary> Total length in bytes of an ARP header.</summary>
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public readonly static int HeaderLength; // == 28
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static ARPFields()
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{
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// NOTE: We use IPv4Fields_Fields.IP_ADDRESS_WIDTH because arp packets are
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// only used in IPv4 networks. Neighbor discovery is used with IPv6
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//FIXME: we really should use the sizes given by the length fields to determine
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// the position offsets here instead of assuming the hw address is an ethernet mac address
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ProtocolAddressTypePosition = HardwareAddressTypePosition + AddressTypeLength;
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HardwareAddressLengthPosition = ProtocolAddressTypePosition + AddressTypeLength;
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ProtocolAddressLengthPosition = HardwareAddressLengthPosition + AddressLengthLength;
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OperationPosition = ProtocolAddressLengthPosition + AddressLengthLength;
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SenderHardwareAddressPosition = OperationPosition + OperationLength;
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SenderProtocolAddressPosition = SenderHardwareAddressPosition + EthernetFields.MacAddressLength;
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TargetHardwareAddressPosition = SenderProtocolAddressPosition + IPv4Fields.AddressLength;
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TargetProtocolAddressPosition = TargetHardwareAddressPosition + EthernetFields.MacAddressLength;
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HeaderLength = TargetProtocolAddressPosition + IPv4Fields.AddressLength;
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}
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}
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}
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