Code/Projects/SmartPlugDetector/src/main/java/edu/uci/iotproject/Main.java

   1 package edu.uci.iotproject;
   2
   3
   4 import org.pcap4j.core.*;
   5 import org.pcap4j.packet.*;
   6 import org.pcap4j.packet.DnsPacket;
   7 import org.pcap4j.packet.namednumber.DnsResourceRecordType;
   8
   9 import java.io.EOFException;
  10 import java.net.Inet4Address;
  11 import java.net.UnknownHostException;
  12 import java.util.ArrayList;
  13 import java.util.HashMap;
  14 import java.util.List;
  15 import java.util.Map;
  16 import java.util.concurrent.TimeoutException;
  17 import java.util.function.Consumer;
  18
  19 /**
  20  * This is a system that reads PCAP files to compare
  21  * patterns of DNS hostnames, packet sequences, and packet
  22  * lengths with training data to determine certain events
  23  * or actions for smart home devices.
  24  *
  25  * @author Janus Varmarken
  26  * @author Rahmadi Trimananda (rtrimana@uci.edu)
  27  * @version 0.1
  28  */
  29 public class Main {
  30
  31
  32     public static void main(String[] args) throws PcapNativeException, NotOpenException, EOFException, TimeoutException, UnknownHostException {
  33         final String fileName = "/users/varmarken/Desktop/wlan1.local.dns.pcap";
  34         List<DnsPacket> dnsPackets = extractDnsAnswerPackets(fileName);
  35         Map<String, List<String>> ipToHostnameMap = constructIpToHostnameMap(dnsPackets);
  36         ipToHostnameMap.forEach((k,v) -> System.out.println(String.format("%s => %s", k, v.toString())));
  37     }
  38
  39     private static List<DnsPacket> extractDnsAnswerPackets(String pcapFileName) throws PcapNativeException, NotOpenException, TimeoutException {
  40         PcapHandle handle;
  41         try {
  42             handle = Pcaps.openOffline(pcapFileName, PcapHandle.TimestampPrecision.NANO);
  43         } catch (PcapNativeException pne) {
  44             handle = Pcaps.openOffline(pcapFileName);
  45         }
  46         // Apparently BPFs don't support "dns" protocol filter, so have to filter by port.
  47         handle.setFilter("port 53", BpfProgram.BpfCompileMode.OPTIMIZE);
  48         ArrayList<DnsPacket> result = new ArrayList<>();
  49         try {
  50             Packet packet;
  51             while ((packet = handle.getNextPacketEx()) != null) {
  52                 DnsPacket dnsPacket = packet.get(DnsPacket.class);
  53                 // We only care about DNS answers.
  54                 if (dnsPacket != null && dnsPacket.getHeader().getAnswers().size() != 0) {
  55                     result.add(dnsPacket);
  56                 }
  57             }
  58         } catch (EOFException eof) {
  59             // (Note have to resort to EOFException as handle.getStats().getNumPacketsCaptured() only works on Windows)
  60             // Clean up.
  61             handle.close();
  62         }
  63         System.out.println(String.format("Found %d DNS answers", result.size()));
  64         return result;
  65     }
  66
  67     private static Map<String, List<String>> constructIpToHostnameMap(List<DnsPacket> dnsPackets) throws UnknownHostException {
  68         HashMap<String, List<String>> result = new HashMap<>();
  69         for(DnsPacket dnsPacket : dnsPackets) {
  70             // The hostname that this DNS reply provides answers for.
  71             // TODO: safe to assume only one question?
  72             String hostname = dnsPacket.getHeader().getQuestions().get(0).getQName().getName();
  73             for(DnsResourceRecord answer : dnsPacket.getHeader().getAnswers()) {
  74                 // We only care about type A records
  75                 if (!answer.getDataType().equals(DnsResourceRecordType.A)) {
  76                     continue;
  77                 }
  78                 // Sanity check. For some reason the hostname appears to be the empty string in the answer .
  79                 // We hence have to assume that all answers correspond to a single question that holds the hostname as part of its object tree.
  80                 // Therefore, if there are more questions in one query-reply exchange, we are in trouble.
  81                 if (!answer.getName().getName().equals("") && !answer.getName().getName().equals(hostname)) {
  82                     throw new RuntimeException("[DNS parser] mismatch between hostname in question and hostname in answer");
  83                 }
  84                 // The IP in byte representation.
  85                 byte[] ipBytes = answer.getRData().getRawData();
  86                 // Convert to string representation.
  87                 String ip = Inet4Address.getByAddress(ipBytes).getHostAddress();
  88                 List<String> hostnameList = new ArrayList<>();
  89                 hostnameList.add(hostname);
  90                 // Update or insert depending on presence of key:
  91                 // Concat the existing list and the new list if ip already present as key,
  92                 // otherwise add an entry for ip pointing to new list.
  93                 result.merge(ip, hostnameList, (v1, v2) -> { v1.addAll(v2); return v1; });
  94             }
  95         }
  96         return result;
  97     }
  98
  99 //    /**
 100 //     * Private class properties
 101 //     */
 102 //    private Pcap pcap;
 103 //    private List<Pcap.Packet> listPacket;
 104 //    private Map<String, String> mapIPAddressToHostname;
 105 //
 106 //    /**
 107 //     * Private class constants
 108 //     */
 109 //    private static final int DNS_PORT = 53;
 110 //
 111 //    /**
 112 //     * Constructor
 113 //     *
 114 //     * @param   file    name of the analyzed PCAP file
 115 //     */
 116 //    public Main(String file) throws IOException {
 117 //
 118 //        pcap = Pcap.fromFile(file);
 119 //        listPacket = pcap.packets();
 120 //        mapIPAddressToHostname = new HashMap<String, String>();
 121 //    }
 122 //
 123 //
 124 //
 125 //
 126 //
 127 //    /**
 128 //     * Private method that maps DNS hostnames to their
 129 //     * respected IP addresses. This method iterates
 130 //     * through the List<Pcap.Packet>, gets DNS packets,
 131 //     * and gets the IP addresses associated with them.
 132 //     */
 133 //    private void mapHostnamesToIPAddresses() {
 134 //
 135 //        int counter = 1;
 136 //        for(Pcap.Packet packet : listPacket) {
 137 //            System.out.print("# " + counter++);
 138 //            // Check the packet type
 139 //            if (packet._root().hdr().network() == Pcap.Linktype.ETHERNET) {
 140 //                EthernetFrame ethFrame = (EthernetFrame) packet.body();
 141 //                if (ethFrame.etherType() == EthernetFrame.EtherTypeEnum.IPV4) {
 142 //                    Ipv4Packet ip4Packet = (Ipv4Packet) ethFrame.body();
 143 //
 144 //                    System.out.print(" - Protocol: " + ip4Packet.protocol());
 145 //                    if (ip4Packet.protocol() == Ipv4Packet.ProtocolEnum.UDP) {
 146 //                        // DNS is UDP port 53
 147 //                        UdpDatagram udpData = (UdpDatagram) ip4Packet.body();
 148 //                        System.out.print(" - Source Port: " + udpData.srcPort());
 149 //                        System.out.print(" - Dest Port: " + udpData.dstPort());
 150 //
 151 //                        // Source port 53 means this is DNS response
 152 //                        if (udpData.srcPort() == DNS_PORT) {
 153 //                            KaitaiStream dnsStream = new ByteBufferKaitaiStream(udpData.body());
 154 //                            DnsPacket dnsPacket = new DnsPacket(dnsStream);
 155 //                            ArrayList<DnsPacket.Query> queries = dnsPacket.queries();
 156 //                            ArrayList<DnsPacket.Answer> answers = dnsPacket.answers();
 157 //                            String strDomainName = new String();
 158 //                            for(DnsPacket.Query query : queries) {
 159 //                                System.out.print(" - Queries: ");
 160 //                                DnsPacket.DomainName domainName = query.name();
 161 //                                ArrayList<DnsPacket.Label> labels = domainName.name();
 162 //                                for(int i = 0; i < labels.size(); i++) {
 163 //                                    System.out.print(labels.get(i).name());
 164 //                                    strDomainName = strDomainName + labels.get(i).name();
 165 //                                    if(i < labels.size()-2) {
 166 //                                        System.out.print(".");
 167 //                                        strDomainName = strDomainName + ".";
 168 //                                    }
 169 //                                }
 170 //                                break;  // We are assuming that there is only one query
 171 //                            }
 172 //                            System.out.print(" - Answers " + answers.size());
 173 //                            for(DnsPacket.Answer answer : answers) {
 174 //                                System.out.print(" - TypeType: " + answer.type());
 175 //                                System.out.print(" - ClassType: " + answer.answerClass());
 176 //                                System.out.print("\n - Answers: ");
 177 //                                DnsPacket.Address address = answer.address();
 178 //                                if (answer.type() == DnsPacket.TypeType.A) {
 179 //                                    String strAnswer = new String();
 180 //                                    ArrayList<Integer> ipList = address.ip();
 181 //                                    for(int i = 0; i < ipList.size(); i++) {
 182 //                                        System.out.print(ipList.get(i));
 183 //                                        strAnswer = strAnswer + Integer.toString(ipList.get(i));
 184 //                                        if(i < ipList.size()-1) {
 185 //                                            System.out.print(".");
 186 //                                            strAnswer = strAnswer + ".";
 187 //                                        }
 188 //                                    }
 189 //                                    mapIPAddressToHostname.put(strAnswer, strDomainName);
 190 //                                }
 191 //                            }
 192 //                        }
 193 //                    }
 194 //                }
 195 //            }
 196 //            System.out.println();
 197 //        }
 198 ////        for(Map.Entry<String, String> entry : mapIPAddressToHostname.entrySet()) {
 199 ////            if (entry.getValue().equals("devs.tplinkcloud.com")) {
 200 ////                System.out.println(entry.getKey() + " - " + entry.getValue());
 201 ////            }
 202 ////        }
 203 //        System.out.println("Total map size: " + mapIPAddressToHostname.size());
 204 //        System.out.println("Answer for 13.33.41.8: " + mapIPAddressToHostname.get("13.33.41.8"));
 205 //        System.out.println("Answer for 34.226.240.125: " + mapIPAddressToHostname.get("34.226.240.125"));
 206 //    }
 207 //
 208 //    /*private String cloudIPAddress(String hostName) {
 209 //        if (hostName.equals("events.tplinkra.com"))
 210 //            return "205.251.203.26";
 211 //        else
 212 //            return null;
 213 //    }*/
 214 //
 215 //    // TODO move to separate class
 216 //    // Add parameter that is the trace to be analyzed (most like the pcap library's representation of a flow)
 217 //    public String findPattern(Map<String, List<Integer>> hostnameToPacketLengths, String smartPlugIp) {
 218 //
 219 //        // No difference, output "Complete match"
 220 //        // If difference, output <Packet no, deviation from expected> for each packet
 221 //        return null;
 222 //    }
 223 //
 224 //    public static void main(String[] args) {
 225 //        System.out.println("it works");
 226 //
 227 //        //String file = "/home/rtrimana/pcap_processing/smart_home_traffic/Code/Projects/SmartPlugDetector/pcap/wlan1.local.dns.pcap";
 228 //        String file = "/home/rtrimana/pcap_processing/smart_home_traffic/Code/Projects/SmartPlugDetector/pcap/wlan1.remote.dns.pcap";
 229 //
 230 //        try {
 231 //            Main main = new Main(file);
 232 //            main.mapHostnamesToIPAddresses();
 233 //
 234 //            /*Pcap data = Pcap.fromFile(file);
 235 //            List<Pcap.Packet> listPacket = data.packets();
 236 //            System.out.println("Number of packets: " + listPacket.size());
 237 //            System.out.println("===================");
 238 //            for(Pcap.Packet packet : listPacket) {
 239 //                if (packet._root().hdr().network() == Pcap.Linktype.ETHERNET) {
 240 //                    EthernetFrame eFrame = (EthernetFrame) packet.body();
 241 //                    if (eFrame.etherType() == EthernetFrame.EtherTypeEnum.IPV4) {
 242 //                        Ipv4Packet ip4Packet = (Ipv4Packet) eFrame.body();
 243 //                        byte[] srcIp = ip4Packet.srcIpAddr();
 244 //                        byte[] dstIp = ip4Packet.dstIpAddr();
 245 //                        System.out.println("Byte length source: " + srcIp.length + " Byte length dest: " + dstIp.length);
 246 //                        System.out.print("Source: ");
 247 //                        for(int i = 0; i < srcIp.length; i++) {
 248 //                            System.out.print(Byte.toUnsignedInt(srcIp[i]));
 249 //                            if(i < srcIp.length-1)
 250 //                                System.out.print(".");
 251 //                        }
 252 //                        System.out.print(" - Dest: ");
 253 //                        for(int i = 0; i < dstIp.length; i++) {
 254 //                            System.out.print(Byte.toUnsignedInt(dstIp[i]));
 255 //                            if(i < dstIp.length-1)
 256 //                                System.out.print(".");
 257 //                            else
 258 //                                System.out.println("\n");
 259 //                        }
 260 //                    }
 261 //                }
 262 //            }*/
 263 //
 264 //        } catch (Exception e) {
 265 //            e.printStackTrace();
 266 //        }
 267 //    }
 268 }