Removing error message for additional feature (relaxed matching).

[pingpong.git] / Code / Projects / PacketLevelSignatureExtractor / src / main / java / edu / uci / iotproject / detection / layer2 / Layer2SequenceMatcher.java

diff --git a/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer2/Layer2SequenceMatcher.java b/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer2/Layer2SequenceMatcher.java
index 2db22287210d412f97b0ccf6783e7b79401c4a25..55fe040eb2a480d92ab9093e20a6120e0f1360f3 100644 (file)
--- a/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer2/Layer2SequenceMatcher.java
+++ b/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer2/Layer2SequenceMatcher.java
@@ -7,6 +7,7 @@ import org.pcap4j.util.MacAddress;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Attempts to detect the presence of a specific packet sequence in the set of packets provided through multiple calls
@@ -22,12 +23,23 @@ public class Layer2SequenceMatcher extends Layer2AbstractMatcher {
      */
     private final List<PcapPacket> mSequence;
 
+    private int mInclusionTimeMillis;
+
+    /**
+     * Relaxed matching
+     */
+    private int mDelta;
+    private Set<Integer> mPacketSet;
+
     /**
      * Create a {@code Layer2SequenceMatcher}.
      * @param sequence The sequence to match against (search for).
+     * @param trainingRouterWlanMac The training router's WLAN MAC (used for determining the direction of packets).
+     * @param routerWlanMac The target trace router's WLAN MAC (used for determining the direction of packets).
      */
-    public Layer2SequenceMatcher(List<PcapPacket> sequence) {
-        super(sequence);
+    public Layer2SequenceMatcher(List<PcapPacket> sequence, int inclusionTimeMillis, String trainingRouterWlanMac,
+                                 String routerWlanMac, int delta, Set<Integer> packetSet) {
+        super(sequence, trainingRouterWlanMac, routerWlanMac);
         mSequence = sequence;
         // Compute packet directions for sequence.
         for (int i = 0; i < sequence.size(); i++) {
@@ -41,6 +53,10 @@ public class Layer2SequenceMatcher extends Layer2AbstractMatcher {
                 mPacketDirections[i] = getPacketDirection(prevPkt, prevPktDirection, sequence.get(i));
             }
         }
+        mInclusionTimeMillis =
+                inclusionTimeMillis == 0 ? TriggerTrafficExtractor.INCLUSION_WINDOW_MILLIS : inclusionTimeMillis;
+        mDelta = delta;
+        mPacketSet = packetSet;
     }
 
     /**
@@ -71,7 +87,10 @@ public class Layer2SequenceMatcher extends Layer2AbstractMatcher {
         // Get representative of the packet we expect to match next.
         PcapPacket expected = mSequence.get(mMatchedPackets.size());
         // First verify if the received packet has the length we're looking for.
-        if (packet.getOriginalLength() == expected.getOriginalLength()) {
+        if ((mDelta > 0 && mPacketSet.contains(expected.getOriginalLength()) &&
+                expected.getOriginalLength() - mDelta <= packet.getOriginalLength() &&
+                packet.getOriginalLength() <= expected.getOriginalLength() + mDelta) ||
+                packet.getOriginalLength() == expected.getOriginalLength()) {
             // If this is the first packet, we only need to verify that its length is correct. Time constraints are
             // obviously satisfied as there are no previous packets. Furthermore, direction matches by definition as we
             // don't know the MAC of the device (or phone) in advance, so we can't enforce a rule saying "first packet
@@ -94,8 +113,10 @@ public class Layer2SequenceMatcher extends Layer2AbstractMatcher {
             if (!packet.getTimestamp().isAfter(mMatchedPackets.get(getMatchedPacketsCount()-1).getTimestamp())) {
                 return false;
             }
+//            if (packet.getTimestamp().isAfter(mMatchedPackets.get(0).getTimestamp().
+//                            plusMillis(TriggerTrafficExtractor.INCLUSION_WINDOW_MILLIS))) {
             if (packet.getTimestamp().isAfter(mMatchedPackets.get(0).getTimestamp().
-                            plusMillis(TriggerTrafficExtractor.INCLUSION_WINDOW_MILLIS))) {
+                plusMillis(mInclusionTimeMillis))) {
                 return false;
             }
             // If we made it here, it means that this packet has the expected length, direction, and obeys the timing