Temporary fix for router's IP as client for WAN trace and paths for new tests for...
[pingpong.git] / Code / Projects / SmartPlugDetector / src / main / java / edu / uci / iotproject / Main.java
index 98b4c270e94a305d9a3de81fe68055bfeca058a2..598cc99a7e099819b12792ddb359684c18dee1f1 100644 (file)
@@ -2,14 +2,15 @@ package edu.uci.iotproject;
 
 import static edu.uci.iotproject.analysis.UserAction.Type;
 
-import edu.uci.iotproject.analysis.TcpConversationUtils;
-import edu.uci.iotproject.analysis.TrafficLabeler;
-import edu.uci.iotproject.analysis.TriggerTrafficExtractor;
-import edu.uci.iotproject.analysis.UserAction;
+import edu.uci.iotproject.analysis.*;
 import edu.uci.iotproject.comparison.seqalignment.ExtractedSequence;
 import edu.uci.iotproject.comparison.seqalignment.SequenceAlignment;
 import edu.uci.iotproject.comparison.seqalignment.SequenceExtraction;
 import edu.uci.iotproject.io.TriggerTimesFileReader;
+import edu.uci.iotproject.util.PcapPacketUtils;
+import edu.uci.iotproject.util.PrintUtils;
+import org.apache.commons.math3.stat.clustering.Cluster;
+import org.apache.commons.math3.stat.clustering.DBSCANClusterer;
 import org.pcap4j.core.*;
 import org.pcap4j.packet.namednumber.DataLinkType;
 
@@ -20,6 +21,8 @@ import java.net.UnknownHostException;
 import java.time.Instant;
 import java.util.*;
 import java.util.concurrent.TimeoutException;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * This is a system that reads PCAP files to compare
@@ -39,8 +42,8 @@ public class Main {
         // ------------ # Code for extracting traffic generated by a device within x seconds of a trigger # ------------
         // Paths to input and output files (consider supplying these as arguments instead) and IP of the device for
         // which traffic is to be extracted:
-//        String path = "/scratch/July-2018"; // Rahmadi
-        String path = "/Users/varmarken/temp/UCI IoT Project/experiments"; // Janus
+        String path = "/scratch/July-2018"; // Rahmadi
+//        String path = "/Users/varmarken/temp/UCI IoT Project/experiments"; // Janus
         boolean verbose = true;
         final String onPairsPath = "/scratch/July-2018/on.txt";
         final String offPairsPath = "/scratch/July-2018/off.txt";
@@ -49,13 +52,23 @@ public class Main {
 //        final String inputPcapFile = path + "/2018-07/dlink/dlink.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-07/dlink/dlink-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-07/dlink/dlink-july-26-2018.timestamps";
-//        final String deviceIp = "192.168.1.246"; // .246 == phone; .199 == dlink plug?
+//        final String deviceIp = "192.168.1.199"; // .246 == phone; .199 == dlink plug?
+          // Actual training
+//        final String inputPcapFile = path + "/2018-10/dlink-plug/dlink-plug.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-10/dlink-plug/dlink-plug-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-10/dlink-plug/dlink-plug-oct-17-2018.timestamps";
+//        final String deviceIp = "192.168.1.199"; // .246 == phone; .199 == dlink plug?
 
         // 2) TP-Link July 25 experiment
-        final String inputPcapFile = path + "/2018-07/tplink/tplink.wlan1.local.pcap";
-        final String outputPcapFile = path + "/2018-07/tplink/tplink-processed.pcap";
-        final String triggerTimesFile = path + "/2018-07/tplink/tplink-july-25-2018.timestamps";
-        final String deviceIp = "192.168.1.159";
+//        final String inputPcapFile = path + "/2018-07/tplink/tplink.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-07/tplink/tplink-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-07/tplink/tplink-july-25-2018.timestamps";
+//        final String deviceIp = "192.168.1.159";
+          // Actual training
+//        final String inputPcapFile = path + "/2018-10/tplink-plug/tplink-plug.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-10/tplink-plug/tplink-plug-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-10/tplink-plug/tplink-plug-oct-17-2018.timestamps";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .159 == tplink plug
 
         // 2b) TP-Link July 25 experiment TRUNCATED:
         // Only contains "true local" events, i.e., before the behavior changes to remote-like behavior.
@@ -69,13 +82,18 @@ public class Main {
 //        final String inputPcapFile = path + "/2018-07/stplug/stplug.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-07/stplug/stplug-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-07/stplug/smartthings-july-25-2018.timestamps";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .142 == SmartThings Hub (note: use eth0 capture for this!)
+        // October 18
+//        final String inputPcapFile = path + "/2018-10/st-plug/st-plug.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-10/st-plug/st-plug-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-10/st-plug/st-plug-oct-18-2018.timestamps";
 //        final String deviceIp = "192.168.1.246"; // .246 == phone; .142 == SmartThings Hub (note: use eth0 capture for this!)
 
         // 4) Wemo July 30 experiment
 //        final String inputPcapFile = path + "/2018-07/wemo/wemo.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-07/wemo/wemo-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-07/wemo/wemo-july-30-2018.timestamps";
-//        final String deviceIp = "192.168.1.145";
+//        final String deviceIp = "192.168.1.145";  // .246 == phone; .145 == WeMo
 
         // 5) Wemo Insight July 31 experiment
 //        final String inputPcapFile = path + "/2018-07/wemoinsight/wemoinsight.wlan1.local.pcap";
@@ -87,12 +105,21 @@ public class Main {
 //        final String inputPcapFile = path + "/2018-08/tplink-bulb/tplinkbulb.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-08/tplink-bulb/tplinkbulb-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-08/tplink-bulb/tplink-bulb-aug-3-2018.timestamps";
-//        final String deviceIp = "192.168.1.246";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .140 == TP-Link bulb
 
         // 7) Kwikset Doorlock August 6 experiment
-//        final String inputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock.wlan1.local.pcap";
+//        final String inputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock.data.wlan1.pcap";
+////        final String inputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock-processed.pcap";
-//        final String triggerTimesFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock-aug-6-2018.timestamps";
+////        final String triggerTimesFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock-aug-6-2018.timestamps";
+//        final String triggerTimesFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock-8hr-data-oct-11-2018.timestamps";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .142 == SmartThings Hub (note: use eth0 capture for this!)
+
+        // September 12, 2018 - includes both wlan1 and eth1 interfaces
+//        final String inputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset3.wlan1.local.pcap";
+//        //final String inputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset3.eth1.local.pcap";
+//        final String outputPcapFile = path + "/2018-08/kwikset-doorlock/kwikset3-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-08/kwikset-doorlock/kwikset-doorlock-sept-12-2018.timestamps";
 //        final String deviceIp = "192.168.1.246"; // .246 == phone; .142 == SmartThings Hub (note: use eth0 capture for this!)
 
         // 8) Hue Bulb August 7 experiment
@@ -100,12 +127,27 @@ public class Main {
 //        final String outputPcapFile = path + "/2018-08/hue-bulb/hue-bulb-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-08/hue-bulb/hue-bulb-aug-7-2018.timestamps";
 //        final String deviceIp = "192.168.1.246";
+        // October 30 experiment
+//        final String inputPcapFile = path + "/2018-10/hue-bulb/hue-bulb.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-10/hue-bulb/hue-bulb-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-10/hue-bulb/hue-bulb-oct-30-2018.timestamps";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .100 == Hue hub
 
         // 9) Lifx Bulb August 8 experiment
 //        final String inputPcapFile = path + "/2018-08/lifx-bulb/lifx-bulb.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-08/lifx-bulb/lifx-bulb-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-08/lifx-bulb/lifx-bulb-aug-8-2018.timestamps";
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .231 == Lifx
+        // October 18
+//        final String inputPcapFile = path + "/2018-10/lifx-bulb/lifx-bulb.wlan1.local.pcap";
+//        final String outputPcapFile = path + "/2018-10/lifx-bulb/lifx-bulb-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-10/lifx-bulb/lifx-bulb-oct-18-2018.timestamps";
 //        final String deviceIp = "192.168.1.231"; // .246 == phone; .231 == Lifx
+        // November 1
+        final String inputPcapFile = path + "/2018-10/lifx-bulb/lifx-bulb.wlan1.local.pcap";
+        final String outputPcapFile = path + "/2018-10/lifx-bulb/lifx-bulb-processed.pcap";
+        final String triggerTimesFile = path + "/2018-10/lifx-bulb/lifx-bulb-nov-1-2018.timestamps";
+        final String deviceIp = "192.168.1.231"; // .246 == phone; .231 == Lifx
 
         // 10) Amcrest Camera August 9 experiment
 //        final String inputPcapFile = path + "/2018-08/amcrest-camera/amcrest-camera.wlan1.local.pcap";
@@ -117,18 +159,21 @@ public class Main {
 //        final String inputPcapFile = path + "/2018-08/arlo-camera/arlo-camera.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-08/arlo-camera/arlo-camera-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-08/arlo-camera/arlo-camera-aug-10-2018.timestamps";
-//        final String deviceIp = "192.168.1.140"; // .246 == phone; .140 == camera
+//        final String deviceIp = "192.168.1.246"; // .246 == phone; .140 == camera
 
         // 12) Blossom sprinkler August 13 experiment
 //        final String inputPcapFile = path + "/2018-08/blossom/blossom.wlan1.local.pcap";
 //        final String outputPcapFile = path + "/2018-08/blossom/blossom-processed.pcap";
 //        final String triggerTimesFile = path + "/2018-08/blossom/blossom-aug-13-2018.timestamps";
-//        final String deviceIp = "192.168.1.246"; // .246 == phone; .229 == sprinkler
+//        final String deviceIp = "192.168.1.229"; // .246 == phone; .229 == sprinkler
 
-        // 13) DLink siren August 14 experiment
+//        // 13) DLink siren August 14 experiment
 //        final String inputPcapFile = path + "/2018-08/dlink-siren/dlink-siren.wlan1.local.pcap";
+//        //final String inputPcapFile = path + "/evaluation/dlink-siren/dlink-siren.data.wlan1.pcap";
 //        final String outputPcapFile = path + "/2018-08/dlink-siren/dlink-siren-processed.pcap";
-//        final String triggerTimesFile = path + "/2018-08/dlink-siren/dlink-siren-aug-14-2018.timestamps";
+//        final String triggerTimesFile = path + "/2018-08/dlink-siren/dlink-siren-oct-12-2018.timestamps";
+//        //final String triggerTimesFile = path + "/2018-08/dlink-siren/dlink-siren-aug-14-2018.timestamps";
+//        //final String triggerTimesFile = path + "/actual/timestamps/dlink-siren-8hr-data-oct-10-2018.timestamps";
 //        final String deviceIp = "192.168.1.246"; // .246 == phone; .183 == siren
 
         // 14) Nest thermostat August 15 experiment
@@ -148,6 +193,22 @@ public class Main {
 //        final String triggerTimesFile = path + "/2018-08/alexa/alexa-aug-17-2018.timestamps";
 //        final String deviceIp = "192.168.1.225"; // .246 == phone; .225 == Alexa
 
+        // September 17
+//        final String inputPcapFile = path + "/2018-08/noise/noise.eth1.pcap";
+//        final String outputPcapFile = path + "/2018-08/noise/noise-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-08/noise/noise-sept-17-2018.timestamps";
+//        final String deviceIp = "192.168.1.142"; //  .142 == SmartThings Hub; .199 == dlink plug; .183 == siren
+        // September 26 - D-Link noise
+//        final String inputPcapFile = path + "/2018-08/noise/noise.dlink.wlan1.pcap";
+//        final String outputPcapFile = path + "/2018-08/noise/noise-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-08/noise/dlink-noise-sept-26-2018.timestamps";
+//        final String deviceIp = "192.168.1.183"; //  .199 == dlink plug; .183 == siren
+        // September 27 - Kwikset noise
+//        final String inputPcapFile = path + "/2018-08/noise/noise.kwikset.eth1.pcap";
+//        final String outputPcapFile = path + "/2018-08/noise/noise-processed.pcap";
+//        final String triggerTimesFile = path + "/2018-08/noise/kwikset-doorlock-noise-sept-27-2018.timestamps";
+//        final String deviceIp = "192.168.1.142"; //  .142 == SmartThings Hub;
+
         TriggerTimesFileReader ttfr = new TriggerTimesFileReader();
         List<Instant> triggerTimes = ttfr.readTriggerTimes(triggerTimesFile, false);
         // Tag each trigger with "ON" or "OFF", assuming that the first trigger is an "ON" and that they alternate.
@@ -201,6 +262,12 @@ public class Main {
 
 
 
+        /*
+         * NOTE: no need to generate these more complex on/off maps that also contain mappings from hostname and
+         * sequence identifiers as we do not care about hostnames and sequences during clustering.
+         * We can simply use the UserAction->List<Conversation> map to generate ON/OFF groupings of conversations.
+         */
+        /*
         // Contains all ON events: hostname -> sequence identifier -> list of conversations with that sequence
         Map<String, Map<String, List<Conversation>>> ons = new HashMap<>();
         // Contains all OFF events: hostname -> sequence identifier -> list of conversations with that sequence
@@ -219,12 +286,108 @@ public class Main {
                 });
             });
         });
-
-
+        */
+
+        // ================================================ CLUSTERING ================================================
+        // Note: no need to use the more convoluted on/off maps; can simply use the UserAction->List<Conversation> map
+        // when don't care about hostnames and sequences (see comment earlier).
+        List<Conversation> onConversations = userActionToConversations.entrySet().stream().
+                filter(e -> e.getKey().getType() == Type.TOGGLE_ON). // drop all OFF events from stream
+                map(e -> e.getValue()). // no longer interested in the UserActions
+                flatMap(List::stream). // flatten List<List<T>> to a List<T>
+                collect(Collectors.toList());
+        List<Conversation> offConversations = userActionToConversations.entrySet().stream().
+                filter(e -> e.getKey().getType() == Type.TOGGLE_OFF).
+                map(e -> e.getValue()).
+                flatMap(List::stream).
+                collect(Collectors.toList());
+        //Collections.sort(onConversations, (c1, c2) -> c1.getPackets().)
+
+        List<PcapPacketPair> onPairs = onConversations.stream().
+                map(c -> c.isTls() ? TcpConversationUtils.extractTlsAppDataPacketPairs(c) :
+                        TcpConversationUtils.extractPacketPairs(c)).
+                flatMap(List::stream). // flatten List<List<>> to List<>
+                collect(Collectors.toList());
+        List<PcapPacketPair> offPairs = offConversations.stream().
+                map(c -> c.isTls() ? TcpConversationUtils.extractTlsAppDataPacketPairs(c) :
+                        TcpConversationUtils.extractPacketPairs(c)).
+                flatMap(List::stream). // flatten List<List<>> to List<>
+                collect(Collectors.toList());
+        // Note: need to update the DnsMap of all PcapPacketPairs if we want to use the IP/hostname-sensitive distance.
+        Stream.concat(Stream.of(onPairs), Stream.of(offPairs)).flatMap(List::stream).forEach(p -> p.setDnsMap(dnsMap));
+        // Perform clustering on conversation logged as part of all ON events.
+        DBSCANClusterer<PcapPacketPair> onClusterer = new DBSCANClusterer<>(10.0, 45);
+        List<Cluster<PcapPacketPair>> onClusters = onClusterer.cluster(onPairs);
+        // Perform clustering on conversation logged as part of all OFF events.
+        DBSCANClusterer<PcapPacketPair> offClusterer = new DBSCANClusterer<>(10.0, 45);
+        List<Cluster<PcapPacketPair>> offClusters = offClusterer.cluster(offPairs);
+        // Sort the conversations as reference
+        List<Conversation> sortedAllConversation = TcpConversationUtils.sortConversationList(allConversations);
+        // Output clusters
+        System.out.println("========================================");
+        System.out.println("       Clustering results for ON        ");
+        System.out.println("       Number of clusters: " + onClusters.size());
+        int count = 0;
+        List<List<List<PcapPacket>>> ppListOfListReadOn = new ArrayList<>();
+        List<List<List<PcapPacket>>> ppListOfListListOn = new ArrayList<>();
+        for (Cluster<PcapPacketPair> c : onClusters) {
+            System.out.println(String.format("<<< Cluster #%02d (%03d points) >>>", ++count, c.getPoints().size()));
+            System.out.print(PrintUtils.toSummaryString(c));
+            if(c.getPoints().size() > 45 && c.getPoints().size() < 55) {
+                // Print to file
+                List<List<PcapPacket>> ppListOfList = PcapPacketUtils.clusterToListOfPcapPackets(c);
+                ppListOfListListOn.add(ppListOfList);
+            }
+        }
+        // TODO: Merging test
+        ppListOfListListOn = PcapPacketUtils.mergeSignatures(ppListOfListListOn, sortedAllConversation);
+        ppListOfListListOn = PcapPacketUtils.sortSignatures(ppListOfListListOn);
+        PcapPacketUtils.printSignatures(ppListOfListListOn);
+        //count = 0;
+        /*for (List<List<PcapPacket>> ll : ppListOfListListOn) {
+            PrintUtils.serializeClustersIntoFile("./onSignature" + ++count + ".sig", ll);
+            ppListOfListReadOn.add(PrintUtils.deserializeClustersFromFile("./onSignature" + count + ".sig"));
+        }*/
+        PrintUtils.serializeSignatureIntoFile("./onSignature.sig", ppListOfListListOn);
+        ppListOfListReadOn = PrintUtils.deserializeSignatureFromFile("./onSignature.sig");
+
+        System.out.println("========================================");
+        System.out.println("       Clustering results for OFF       ");
+        System.out.println("       Number of clusters: " + offClusters.size());
+        count = 0;
+        List<List<List<PcapPacket>>> ppListOfListReadOff = new ArrayList<>();
+        List<List<List<PcapPacket>>> ppListOfListListOff = new ArrayList<>();
+        for (Cluster<PcapPacketPair> c : offClusters) {
+            System.out.println(String.format("<<< Cluster #%03d (%06d points) >>>", ++count, c.getPoints().size()));
+            System.out.print(PrintUtils.toSummaryString(c));
+            if(c.getPoints().size() > 45 && c.getPoints().size() < 55) {
+                // Print to file
+                List<List<PcapPacket>> ppListOfList = PcapPacketUtils.clusterToListOfPcapPackets(c);
+                ppListOfListListOff.add(ppListOfList);
+            }
+        }
+        // TODO: Merging test
+        ppListOfListListOff = PcapPacketUtils.mergeSignatures(ppListOfListListOff, sortedAllConversation);
+        ppListOfListListOff = PcapPacketUtils.sortSignatures(ppListOfListListOff);
+        PcapPacketUtils.printSignatures(ppListOfListListOff);
+        //count = 0;
+        /*for (List<List<PcapPacket>> ll : ppListOfListListOff) {
+            PrintUtils.serializeClustersIntoFile("./offSignature" + ++count + ".sig", ll);
+            ppListOfListReadOff.add(PrintUtils.deserializeClustersFromFile("./offSignature" + count + ".sig"));
+        }*/
+        PrintUtils.serializeSignatureIntoFile("./offSignature.sig", ppListOfListListOff);
+        ppListOfListReadOff = PrintUtils.deserializeSignatureFromFile("./offSignature.sig");
+        System.out.println("========================================");
+        // ============================================================================================================
+
+        /*
+        System.out.println("==== ON ====");
         // Print out all the pairs into a file for ON events
         File fileOnEvents = new File(onPairsPath);
         PrintWriter pwOn = null;
         try {
+
+
             pwOn = new PrintWriter(fileOnEvents);
         } catch(Exception ex) {
             ex.printStackTrace();
@@ -238,59 +401,16 @@ public class Main {
                 for(Conversation conv : listConv) {
                     // Process only if it is a TLS packet
                     if (conv.isTls()) {
-                        List<PcapPacket> tlsAppDataList = conv.getTlsApplicationDataPackets();
-                        // Loop and print out packets
-                        int count = 0;
-                        // The direction of the first packet
-                        Conversation.Direction firstDir = null;
-                        // The length of the first packet
-                        int firstLen = 0;
-                        for (PcapPacket pcap : tlsAppDataList) {
-                            boolean isPair = false;
-                            if (count % 2 == 0) {
-                                firstDir = conv.getDirection(pcap);
-                                firstLen = pcap.length();
-                            } else {// count%2 == 1
-                                if(conv.getDirection(pcap) != firstDir) {
-                                    isPair = true;
-                                    pwOn.println(firstLen + ", " + pcap.length());
-                                    //System.out.println(firstDir + ", " + conv.getDirection(pcap));
-                                    //System.out.println(firstLen + ", " + pcap.length());
-                                }
-                            }
-                            count++;
-                            // If we can't create a pair then just pad it with 0
-                            if (count == tlsAppDataList.size() && !isPair) {
-                                pwOn.println(firstLen + ", 0");
-                            }
+                        List<PcapPacketPair> tlsAppDataList = TcpConversationUtils.extractTlsAppDataPacketPairs(conv);
+                        for(PcapPacketPair pair: tlsAppDataList) {
+                            System.out.println(PrintUtils.toCsv(pair, dnsMap));
+                            pwOn.println(PrintUtils.toCsv(pair, dnsMap));
                         }
                     } else { // Non-TLS conversations
-                        List<PcapPacket> packetList = conv.getPackets();
-                        // Loop and print out packets
-                        int count = 0;
-                        // The direction of the first packet
-                        Conversation.Direction firstDir = null;
-                        // The length of the first packet
-                        int firstLen = 0;
-                        for (PcapPacket pcap : packetList) {
-                            System.out.println(pcap.length() + ", " + conv.getDirection(pcap));
-                            boolean isPair = false;
-                            if (count % 2 == 0) {
-                                firstDir = conv.getDirection(pcap);
-                                firstLen = pcap.length();
-                            } else {// count%2 == 1
-                                if(conv.getDirection(pcap) != firstDir) {
-                                    isPair = true;
-                                    pwOn.println(firstLen + ", " + pcap.length());
-                                    //System.out.println(firstDir + ", " + conv.getDirection(pcap));
-                                    //System.out.println(firstLen + ", " + pcap.length());
-                                }
-                            }
-                            count++;
-                            // If we can't create a pair then just pad it with 0
-                            if (count == packetList.size() && !isPair) {
-                                pwOn.println(firstLen + ", 0");
-                            }
+                        List<PcapPacketPair> packetList = TcpConversationUtils.extractPacketPairs(conv);
+                        for(PcapPacketPair pair: packetList) {
+                            System.out.println(PrintUtils.toCsv(pair, dnsMap));
+                            pwOn.println(PrintUtils.toCsv(pair, dnsMap));
                         }
                     }
                 }
@@ -298,6 +418,7 @@ public class Main {
         }
         pwOn.close();
 
+        System.out.println("==== OFF ====");
         // Print out all the pairs into a file for ON events
         File fileOffEvents = new File(offPairsPath);
         PrintWriter pwOff = null;
@@ -315,120 +436,76 @@ public class Main {
                 for(Conversation conv : listConv) {
                     // Process only if it is a TLS packet
                     if (conv.isTls()) {
-                        List<PcapPacket> tlsAppDataList = conv.getTlsApplicationDataPackets();
-                        // Loop and print out packets
-                        int count = 0;
-                        // The direction of the first packet
-                        Conversation.Direction firstDir = null;
-                        // The length of the first packet
-                        int firstLen = 0;
-                        for (PcapPacket pcap : tlsAppDataList) {
-                            boolean isPair = false;
-                            if (count % 2 == 0) {
-                                firstDir = conv.getDirection(pcap);
-                                firstLen = pcap.length();
-                            } else {// count%2 == 1
-                                if(conv.getDirection(pcap) != firstDir) {
-                                    isPair = true;
-                                    pwOff.println(firstLen + ", " + pcap.length());
-                                    System.out.println(firstDir + ", " + conv.getDirection(pcap));
-                                    System.out.println(firstLen + ", " + pcap.length());
-                                }
-                            }
-                            count++;
-                            // If we can't create a pair then just pad it with 0
-                            if (count == tlsAppDataList.size() && !isPair) {
-                                pwOff.println(firstLen + ", 0");
-                            }
-
+                        List<PcapPacketPair> tlsAppDataList = TcpConversationUtils.extractTlsAppDataPacketPairs(conv);
+                        for(PcapPacketPair pair: tlsAppDataList) {
+                            System.out.println(PrintUtils.toCsv(pair, dnsMap));
+                            pwOff.println(PrintUtils.toCsv(pair, dnsMap));
                         }
                     } else { // Non-TLS conversations
-                        List<PcapPacket> packetList = conv.getPackets();
-                        // Loop and print out packets
-                        int count = 0;
-                        // The direction of the first packet
-                        Conversation.Direction firstDir = null;
-                        // The length of the first packet
-                        int firstLen = 0;
-                        for (PcapPacket pcap : packetList) {
-                            System.out.println(pcap.length() + ", " + conv.getDirection(pcap));
-                            boolean isPair = false;
-                            if (count % 2 == 0) {
-                                firstDir = conv.getDirection(pcap);
-                                firstLen = pcap.length();
-                            } else {// count%2 == 1
-                                if(conv.getDirection(pcap) != firstDir) {
-                                    isPair = true;
-                                    pwOff.println(firstLen + ", " + pcap.length());
-                                    System.out.println(firstDir + ", " + conv.getDirection(pcap));
-                                    System.out.println(firstLen + ", " + pcap.length());
-                                }
-                            }
-                            count++;
-                            // If we can't create a pair then just pad it with 0
-                            if (count == packetList.size() && !isPair) {
-                                pwOff.println(firstLen + ", 0");
-                            }
+                        List<PcapPacketPair> packetList = TcpConversationUtils.extractPacketPairs(conv);
+                        for (PcapPacketPair pair : packetList) {
+                            System.out.println(PrintUtils.toCsv(pair, dnsMap));
+                            pwOff.println(PrintUtils.toCsv(pair, dnsMap));
                         }
                     }
                 }
             }
         }
         pwOff.close();
-
-
-        // ================================================================================================
-        // <<< Some work-in-progress/explorative code that extracts a "representative" sequence >>>
-        //
-        // Currently need to know relevant hostname in advance :(
-        String hostname = "events.tplinkra.com";
-//        String hostname = "rfe-us-west-1.dch.dlink.com";
-        // Conversations with 'hostname' for ON events.
-        List<Conversation> onsForHostname = new ArrayList<>();
-        // Conversations with 'hostname' for OFF events.
-        List<Conversation> offsForHostname = new ArrayList<>();
-        // "Unwrap" sequence groupings in ons/offs maps.
-        ons.get(hostname).forEach((k,v) -> onsForHostname.addAll(v));
-        offs.get(hostname).forEach((k,v) -> offsForHostname.addAll(v));
-
-
-        Map<String, List<Conversation>> onsForHostnameGroupedByTlsAppDataSequence = TcpConversationUtils.groupConversationsByTlsApplicationDataPacketSequence(onsForHostname);
-
-
-        // Extract representative sequence for ON and OFF by providing the list of conversations with
-        // 'hostname' observed for each event type (the training data).
-        SequenceExtraction seqExtraction = new SequenceExtraction();
-//        ExtractedSequence extractedSequenceForOn = seqExtraction.extract(onsForHostname);
-//        ExtractedSequence extractedSequenceForOff = seqExtraction.extract(offsForHostname);
-
-        ExtractedSequence extractedSequenceForOn = seqExtraction.extractByTlsAppData(onsForHostname);
-        ExtractedSequence extractedSequenceForOff = seqExtraction.extractByTlsAppData(offsForHostname);
-
-        // Let's check how many ONs align with OFFs and vice versa (that is, how many times an event is incorrectly
-        // labeled).
-        int onsLabeledAsOff = 0;
-        Integer[] representativeOnSeq = TcpConversationUtils.getPacketLengthSequence(extractedSequenceForOn.getRepresentativeSequence());
-        Integer[] representativeOffSeq = TcpConversationUtils.getPacketLengthSequence(extractedSequenceForOff.getRepresentativeSequence());
-        SequenceAlignment<Integer> seqAlg = seqExtraction.getAlignmentAlgorithm();
-        for (Conversation c : onsForHostname) {
-            Integer[] onSeq = TcpConversationUtils.getPacketLengthSequence(c);
-            if (seqAlg.calculateAlignment(representativeOffSeq, onSeq) <= extractedSequenceForOff.getMaxAlignmentCost()) {
-                onsLabeledAsOff++;
-            }
-        }
-        int offsLabeledAsOn = 0;
-        for (Conversation c : offsForHostname) {
-            Integer[] offSeq = TcpConversationUtils.getPacketLengthSequence(c);
-            if (seqAlg.calculateAlignment(representativeOnSeq, offSeq) <= extractedSequenceForOn.getMaxAlignmentCost()) {
-                offsLabeledAsOn++;
-            }
-        }
-        System.out.println("");
-        // ================================================================================================
-
-
-        // -------------------------------------------------------------------------------------------------------------
-        // -------------------------------------------------------------------------------------------------------------
+        */
+
+//        // ================================================================================================
+//        // <<< Some work-in-progress/explorative code that extracts a "representative" sequence >>>
+//        //
+//        // Currently need to know relevant hostname in advance :(
+//        String hostname = "events.tplinkra.com";
+////        String hostname = "rfe-us-west-1.dch.dlink.com";
+//        // Conversations with 'hostname' for ON events.
+//        List<Conversation> onsForHostname = new ArrayList<>();
+//        // Conversations with 'hostname' for OFF events.
+//        List<Conversation> offsForHostname = new ArrayList<>();
+//        // "Unwrap" sequence groupings in ons/offs maps.
+//        ons.get(hostname).forEach((k,v) -> onsForHostname.addAll(v));
+//        offs.get(hostname).forEach((k,v) -> offsForHostname.addAll(v));
+//
+//
+//        Map<String, List<Conversation>> onsForHostnameGroupedByTlsAppDataSequence = TcpConversationUtils.groupConversationsByTlsApplicationDataPacketSequence(onsForHostname);
+//
+//
+//        // Extract representative sequence for ON and OFF by providing the list of conversations with
+//        // 'hostname' observed for each event type (the training data).
+//        SequenceExtraction seqExtraction = new SequenceExtraction();
+////        ExtractedSequence extractedSequenceForOn = seqExtraction.extract(onsForHostname);
+////        ExtractedSequence extractedSequenceForOff = seqExtraction.extract(offsForHostname);
+//
+//        ExtractedSequence extractedSequenceForOn = seqExtraction.extractByTlsAppData(onsForHostname);
+//        ExtractedSequence extractedSequenceForOff = seqExtraction.extractByTlsAppData(offsForHostname);
+//
+//        // Let's check how many ONs align with OFFs and vice versa (that is, how many times an event is incorrectly
+//        // labeled).
+//        int onsLabeledAsOff = 0;
+//        Integer[] representativeOnSeq = TcpConversationUtils.getPacketLengthSequence(extractedSequenceForOn.getRepresentativeSequence());
+//        Integer[] representativeOffSeq = TcpConversationUtils.getPacketLengthSequence(extractedSequenceForOff.getRepresentativeSequence());
+//        SequenceAlignment<Integer> seqAlg = seqExtraction.getAlignmentAlgorithm();
+//        for (Conversation c : onsForHostname) {
+//            Integer[] onSeq = TcpConversationUtils.getPacketLengthSequence(c);
+//            if (seqAlg.calculateAlignment(representativeOffSeq, onSeq) <= extractedSequenceForOff.getMaxAlignmentCost()) {
+//                onsLabeledAsOff++;
+//            }
+//        }
+//        int offsLabeledAsOn = 0;
+//        for (Conversation c : offsForHostname) {
+//            Integer[] offSeq = TcpConversationUtils.getPacketLengthSequence(c);
+//            if (seqAlg.calculateAlignment(representativeOnSeq, offSeq) <= extractedSequenceForOn.getMaxAlignmentCost()) {
+//                offsLabeledAsOn++;
+//            }
+//        }
+//        System.out.println("");
+//        // ================================================================================================
+//
+//
+//        // -------------------------------------------------------------------------------------------------------------
+//        // -------------------------------------------------------------------------------------------------------------
     }
 
 }