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IPPacket.cs ( File view )

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			/// <summary>************************************************************************
/// Copyright (C) 2001, Patrick Charles and Jonas Lehmann                   *
/// Distributed under the Mozilla Public License                            *
/// http://www.mozilla.org/NPL/MPL-1.1.txt                                *
/// *************************************************************************
/// </summary>
using System;
using AnsiEscapeSequences_Fields = SharpPcap.Packets.Util.AnsiEscapeSequences_Fields;
using ArrayHelper = SharpPcap.Packets.Util.ArrayHelper;
using Timeval = SharpPcap.Packets.Util.Timeval;

namespace SharpPcap.Packets
{

    /// <summary> An IP protocol packet.
    /// <p>
    /// Extends an ethernet packet, adding IP header information and an IP 
    /// data payload. 
    ///
    /// </summary>
    [Serializable]
    public class IPPacket : EthernetPacket
    {

        /// <summary> Code constants for internet protocol versions.
        /// 
        /// </summary>
        public enum IPVersions
        {

            /// <summary> Internet protocol version 4.</summary>
            IPv4 = 4,
            /// <summary> Internet protocol version 6.</summary>
            IPv6 = 6
        
}

        public IPv4Packet ipv4;
        public IPv6Packet ipv6;

        // offset from beginning of byte array where IP header ends (i.e.,
        //  size of ethernet frame header and IP header
        protected internal int _ipOffset;

        /// <summary> Create a new IP packet. </summary>
        public IPPacket(int lLen, byte[] bytes, IPVersions version)
            : base(lLen, bytes)
        {

            IPVersion = version;
        
}

        /// <summary> Create a new IP packet. </summary>
        public IPPacket(int lLen, byte[] bytes)
            : base(lLen, bytes)
        {

            InitIPPacket(IPVersion);
        
}

        /// <summary> Create a new IP packet.</summary>
        public IPPacket(int lLen, byte[] bytes, Timeval tv)
            : this(lLen, bytes)
        {

            this._timeval = tv;
        
}

        /// <summary> Create a new IP packet.</summary>
        public IPPacket(int lLen, byte[] bytes, Timeval tv, IPVersions version)
            : this(lLen, bytes, version)
        {

            this._timeval = tv;
        
}

        private void InitIPPacket(IPVersions version)
        {

            ipv4 = null;
            ipv6 = null;

            if (version == IPVersions.IPv4)
            {

                ipv4 = new IPv4Packet(EthernetHeaderLength, Bytes);
                _ipOffset = _ethOffset + IPv4Fields_Fields.IP_HEADER_LEN;
            
}
            else if (version == IPVersions.IPv6)
            {

                ipv6 = new IPv6Packet(EthernetHeaderLength, Bytes);
                _ipOffset = _ethOffset + IPv6Fields_Fields.IPv6_HEADER_LEN;
            
}
            else
            {

                //lame default
                _ipOffset = _ethOffset;
            
}
        
}

        public override byte[] Bytes
        {

            get
            {

                return base.Bytes;
            
}
            protected set
            {

                base.Bytes = value;
                InitIPPacket(IPVersion);
            
}
        
}

        /// <summary>
        ///  should be overriden by upper classes
        /// </summary>
        public override void OnOffsetChanged()
        {

            base.OnOffsetChanged();

            InitIPPacket(IPVersion);
        
}

        /// <summary> Get the IP version code.</summary>
        virtual public IPVersions IPVersion
        {

            get
            {

                return (IPVersions)((ArrayHelper.extractInteger(Bytes,
                                                                _ethOffset + IPv4Fields_Fields.IP_VER_POS,
                                                                IPv4Fields_Fields.IP_VER_LEN) >> 4) & 0xf);
            
}

            set
            {

                Bytes[_ethOffset + IPv4Fields_Fields.IP_VER_POS] &= (byte)(0x0f);
                Bytes[_ethOffset + IPv4Fields_Fields.IP_VER_POS] |= (byte)((((int)value << 4) & 0xf0));

                //version had changed, reinit packet
                InitIPPacket(IPVersion);
            
}
        
}

        /// <summary> Fetch ascii escape sequence of the color associated with this packet type.</summary>
        override public System.String Color
        {

            get
            {

                return AnsiEscapeSequences_Fields.WHITE;
            
}
        
}

        /// <summary> Returns the payload length of the packet</summary>
        public int IPPayloadLength
        {

            get
            {

                if(ipv4 != null)
                    return ipv4.IPPayloadLength;
                else if(ipv6 != null)
                    return ipv6.IPPayloadLength;
                else
                    throw new System.InvalidOperationException();
            
}
            set
            {

                if (ipv4 != null)
                    ipv4.IPTotalLength = value + IPv4Fields_Fields.IP_HEADER_LEN;
                else if (ipv6 != null)
                    ipv6.IPPayloadLength = value;
                else
                    throw new System.InvalidOperationException();
            
}
        
}

        /// <summary> Convert this IP packet to a readable string.</summary>
        public override System.String ToString()
        {

            return ToColoredString(false);
        
}

        /// <summary> Generate string with contents describing this IP packet.</summary>
        /// <param name="colored">whether or not the string should contain ansi
        /// color escape sequences.
        /// </param>
        public override System.String ToColoredString(bool colored)
        {

            System.Text.StringBuilder buffer = new System.Text.StringBuilder();
            if(ipv4 != null)
                buffer.Append(ipv4.ToColoredString(colored));
            else if (ipv6 != null)
                buffer.Append(ipv6.ToColoredString(colored));
            else
            {

                //unknown version
                buffer.Append('[');
                if (colored)
                    buffer.Append(Color);
                buffer.Append("IPPacket (Unknown Version)");
                if (colored)
                    buffer.Append(AnsiEscapeSequences_Fields.RESET);
            
}

            return buffer.ToString();
        
}

        /// <summary> Convert this IP packet to a more verbose string.</summary>
        public override System.String ToColoredVerboseString(bool colored)
        {

            System.Text.StringBuilder buffer = new System.Text.StringBuilder();
            buffer.Append('[');
            if (colored)
                buffer.Append(Color);
            buffer.Append("IPPacket");
            if (colored)
                buffer.Append(AnsiEscapeSequences_Fields.RESET);

            if(ipv4 != null)
                buffer.Append(ipv4.ToColoredVerboseString(colored));
            else if(ipv6 != null)
                buffer.Append(ipv6.ToColoredVerboseString(colored));

            return buffer.ToString();
        
}

        public static System.Net.IPAddress GetIPAddress(System.Net.Sockets.AddressFamily ipType, int fieldOffset, byte[] bytes)
        {

            byte[] address;
            if(ipType == System.Net.Sockets.AddressFamily.InterNetwork) // ipv4
            {

                address = new byte[4];
            
} else if(ipType == System.Net.Sockets.AddressFamily.InterNetworkV6)
            {

                address = new byte[16];
            
} else
            {

                throw new System.InvalidOperationException("ipType " + ipType + " unknown");
            
}

            System.Array.Copy(bytes, fieldOffset,
                              address, 0, address.Length);

            return new System.Net.IPAddress(address);
        
}



        // some convience mapping methods since there are fields that match exactly between
        // ipv4 and ipv6
        /// <summary> Fetch the IP address of the host where the packet originated from.</summary>
        virtual public System.Net.IPAddress SourceAddress
        {

            get
            {

                if(ipv4 != null)
                {

                    return ipv4.SourceAddress;
                
} else if(ipv6 != null)
                {

                    return ipv6.SourceAddress;
                
} else
                {

                    throw new System.InvalidOperationException("ipv4 and ipv6 are both null");                    
                
}
            
}

            set
            {

                if(IPVersion == IPVersions.IPv4)
                {

                    ipv4.SourceAddress = value;
                
} else if(IPVersion == IPVersions.IPv6)
                {

                    ipv6.SourceAddress = value;
                
} else
                {

                    throw new System.InvalidOperationException("ipv4 and ipv6 are both null");                    
                
}
            
}
        
}

        /// <summary> Fetch the IP address of the host where the packet is destined.</summary>
        virtual public System.Net.IPAddress DestinationAddress
        {

            get
            {

                if(ipv4 != null)
                {

                    return ipv4.DestinationAddress;
                
} else if(ipv6 != null)
                {

                    return ipv6.DestinationAddress;
                
} else
                {

                    throw new System.InvalidOperationException("ipv4 and ipv6 are both null");                    
                
}
            
}

            set
            {

                if(ipv4 != null)
                {

                    ipv4.DestinationAddress = value;
                
} else if(ipv6 != null)
                {

                    ipv6.DestinationAddress = value;
                
} else
                {

                    throw new System.InvalidOperationException("ipv4 and ipv6 are both null");                    
                
}
            
}
        
}

        // HopLimit(IPv6) and TimeToLive(IPv4) have the same meaning
        public int HopLimit
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Int64Range.cs1.77 kB10-08-09|02:39
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CheckFilterTest.cs528.00 B10-08-09|02:39
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Form1.cs2.91 kB10-08-09|02:39
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IPAddressRangeTest.cs3.42 kB10-08-09|02:39
IPSubnetTest.cs599.00 B10-08-09|02:39
IPv6PacketTest.cs4.07 kB10-08-09|02:39
Int64RangeTest.cs3.41 kB10-08-09|02:39
InvalidPacketTest.cs1.25 kB10-08-09|02:39
IpUtilTest.cs2.12 kB10-08-09|02:39
PacketsTest.cs1.09 kB10-08-09|02:39
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PcapTest.cs313.00 B10-08-09|02:39
SendTcpSynExample.cs6.63 kB10-08-09|02:39
SetFilterTest.cs646.00 B10-08-09|02:39
TCPPacketTest.cs3.24 kB10-08-09|02:39
Test.csproj6.20 kB10-08-09|02:39
UDPPacketTest.cs1.04 kB10-08-09|02:39
UdpTest.cs2.13 kB10-08-09|02:39
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arp_request_response.pcap158.00 B10-08-09|02:39
ip_packet_bogus_length.pcap1.53 kB10-08-09|02:39
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