96 lines
4.3 KiB
C#
96 lines
4.3 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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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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public struct TcpFields
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{
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#pragma warning disable 1591
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// flag bitmasks
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public readonly static int TCP_CWR_MASK = 0x0080;
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public readonly static int TCP_ECN_MASK = 0x0040;
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public readonly static int TCP_URG_MASK = 0x0020;
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public readonly static int TCP_ACK_MASK = 0x0010;
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public readonly static int TCP_PSH_MASK = 0x0008;
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public readonly static int TCP_RST_MASK = 0x0004;
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public readonly static int TCP_SYN_MASK = 0x0002;
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public readonly static int TCP_FIN_MASK = 0x0001;
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#pragma warning restore 1591
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/// <summary> Length of a TCP port in bytes.</summary>
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public readonly static int PortLength = 2;
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/// <summary> Length of the sequence number in bytes.</summary>
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public readonly static int SequenceNumberLength = 4;
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/// <summary> Length of the acknowledgment number in bytes.</summary>
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public readonly static int AckNumberLength = 4;
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/// <summary> Length of the data offset and flags field in bytes.</summary>
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public readonly static int DataOffsetLength = 1;
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/// <summary> The length of the flags field </summary>
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public readonly static int FlagsLength = 1;
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/// <summary> Length of the window size field in bytes.</summary>
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public readonly static int WindowSizeLength = 2;
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/// <summary> Length of the checksum field in bytes.</summary>
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public readonly static int ChecksumLength = 2;
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/// <summary> Length of the urgent field in bytes.</summary>
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public readonly static int UrgentPointerLength = 2;
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/// <summary> Position of the source port field.</summary>
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public readonly static int SourcePortPosition = 0;
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/// <summary> Position of the destination port field.</summary>
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public readonly static int DestinationPortPosition;
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/// <summary> Position of the sequence number field.</summary>
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public readonly static int SequenceNumberPosition;
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/// <summary> Position of the acknowledgment number field.</summary>
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public readonly static int AckNumberPosition;
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/// <summary> Position of the data offset </summary>
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public readonly static int DataOffsetPosition;
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/// <summary> Position of the flags field </summary>
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public readonly static int FlagsPosition;
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/// <summary> Position of the window size field.</summary>
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public readonly static int WindowSizePosition;
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/// <summary> Position of the checksum field.</summary>
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public readonly static int ChecksumPosition;
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/// <summary> Position of the urgent pointer field.</summary>
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public readonly static int UrgentPointerPosition;
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/// <summary> Length in bytes of a TCP header.</summary>
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public readonly static int HeaderLength; // == 20
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static TcpFields()
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{
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DestinationPortPosition = PortLength;
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SequenceNumberPosition = DestinationPortPosition + PortLength;
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AckNumberPosition = SequenceNumberPosition + SequenceNumberLength;
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DataOffsetPosition = AckNumberPosition + AckNumberLength;
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FlagsPosition = DataOffsetPosition + DataOffsetLength;
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WindowSizePosition = FlagsPosition + FlagsLength;
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ChecksumPosition = WindowSizePosition + WindowSizeLength;
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UrgentPointerPosition = ChecksumPosition + ChecksumLength;
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HeaderLength = UrgentPointerPosition + UrgentPointerLength;
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}
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}
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}
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