コード例 #1
0
ファイル: ARP.cs プロジェクト: hakanaku2009/svn-dump
        private GodLesZ.Library.Network.Packet.Packet BuildRequest(System.Net.IPAddress destinationIP,
                                                                   PhysicalAddress localMac,
                                                                   System.Net.IPAddress localIP)
        {
            // an arp packet is inside of an ethernet packet
            var ethernetPacket = new GodLesZ.Library.Network.Packet.EthernetPacket(localMac,
                                                                                   PhysicalAddress.Parse("FF-FF-FF-FF-FF-FF"),
                                                                                   GodLesZ.Library.Network.Packet.EthernetPacketType.Arp);
            var arpPacket = new GodLesZ.Library.Network.Packet.ARPPacket(GodLesZ.Library.Network.Packet.ARPOperation.Request,
                                                                         PhysicalAddress.Parse("00-00-00-00-00-00"),
                                                                         destinationIP,
                                                                         localMac,
                                                                         localIP);

            // the arp packet is the payload of the ethernet packet
            ethernetPacket.PayloadPacket = arpPacket;

            return(ethernetPacket);
        }
コード例 #2
0
ファイル: ARP.cs プロジェクト: GodLesZ/svn-dump
		private GodLesZ.Library.Network.Packet.Packet BuildRequest(System.Net.IPAddress destinationIP,
												 PhysicalAddress localMac,
												 System.Net.IPAddress localIP) {
			// an arp packet is inside of an ethernet packet
			var ethernetPacket = new GodLesZ.Library.Network.Packet.EthernetPacket(localMac,
																 PhysicalAddress.Parse("FF-FF-FF-FF-FF-FF"),
																 GodLesZ.Library.Network.Packet.EthernetPacketType.Arp);
			var arpPacket = new GodLesZ.Library.Network.Packet.ARPPacket(GodLesZ.Library.Network.Packet.ARPOperation.Request,
													   PhysicalAddress.Parse("00-00-00-00-00-00"),
													   destinationIP,
													   localMac,
													   localIP);

			// the arp packet is the payload of the ethernet packet
			ethernetPacket.PayloadPacket = arpPacket;

			return ethernetPacket;
		}
コード例 #3
0
ファイル: ARP.cs プロジェクト: hakanaku2009/svn-dump
        /// <summary>
        /// Resolves the MAC address of the specified IP address
        /// </summary>
        /// <param name="destIP">The IP address to resolve</param>
        /// <param name="localIP">The local IP address from which to send the ARP request, if null the local address will be discovered</param>
        /// <param name="localMAC">The localMAC address to use, if null the local mac will be discovered</param>
        /// <returns>The MAC address that matches to the given IP address or
        /// null if there was a timeout</returns>
        public PhysicalAddress Resolve(System.Net.IPAddress destIP,
                                       System.Net.IPAddress localIP,
                                       PhysicalAddress localMAC)
        {
            // if no local ip address is specified attempt to find one from the adapter
            if (localIP == null)
            {
                if (_device.Addresses.Count > 0)
                {
                    // attempt to find an ipv4 address.
                    // ARP is ipv4, NDP is used for ipv6
                    foreach (var address in _device.Addresses)
                    {
                        if (address.Addr.type == LibPcap.Sockaddr.AddressTypes.AF_INET_AF_INET6)
                        {
                            // make sure the address is ipv4
                            if (address.Addr.ipAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                            {
                                localIP = address.Addr.ipAddress;
                                break;                                 // break out of the foreach
                            }
                        }
                    }

                    // if we can't find either an ipv6 or an ipv4 address use the localhost address
                    if (localIP == null)
                    {
                        localIP = System.Net.IPAddress.Parse("127.0.0.1");
                    }
                }
            }

            // if no local mac address is specified attempt to find one from the device
            if (localMAC == null)
            {
                foreach (var address in _device.Addresses)
                {
                    if (address.Addr.type == LibPcap.Sockaddr.AddressTypes.HARDWARE)
                    {
                        localMAC = address.Addr.hardwareAddress;
                    }
                }
            }

            if (localIP == null)
            {
                throw new System.InvalidOperationException("Unable to find local ip address");
            }

            if (localMAC == null)
            {
                throw new System.InvalidOperationException("Unable to find local mac address");
            }

            //Build a new ARP request packet
            var request = BuildRequest(destIP, localMAC, localIP);

            //create a "tcpdump" filter for allowing only arp replies to be read
            String arpFilter = "arp and ether dst " + localMAC.ToString();

            //open the device with 20ms timeout
            _device.Open(DeviceMode.Promiscuous, 20);

            //set the filter
            _device.Filter = arpFilter;

            // set a last request time that will trigger sending the
            // arp request immediately
            var lastRequestTime = DateTime.FromBinary(0);

            var requestInterval = new TimeSpan(0, 0, 1);

            GodLesZ.Library.Network.Packet.ARPPacket arpPacket = null;

            // attempt to resolve the address with the current timeout
            var timeoutDateTime = DateTime.Now + Timeout;

            while (DateTime.Now < timeoutDateTime)
            {
                if (requestInterval < (DateTime.Now - lastRequestTime))
                {
                    // inject the packet to the wire
                    _device.SendPacket(request);
                    lastRequestTime = DateTime.Now;
                }

                //read the next packet from the network
                var reply = _device.GetNextPacket();
                if (reply == null)
                {
                    continue;
                }

                // parse the packet
                var packet = GodLesZ.Library.Network.Packet.Packet.ParsePacket(reply.LinkLayerType, reply.Data);

                // is this an arp packet?
                arpPacket = GodLesZ.Library.Network.Packet.ARPPacket.GetEncapsulated(packet);
                if (arpPacket == null)
                {
                    continue;
                }

                //if this is the reply we're looking for, stop
                if (arpPacket.SenderProtocolAddress.Equals(destIP))
                {
                    break;
                }
            }

            // free the device
            _device.Close();

            // the timeout happened
            if (DateTime.Now >= timeoutDateTime)
            {
                return(null);
            }
            else
            {
                //return the resolved MAC address
                return(arpPacket.SenderHardwareAddress);
            }
        }