Changing the mechanism to count and correlate skipped packets.

[pingpong.git] / Code / Projects / PacketLevelSignatureExtractor / src / main / java / edu / uci / iotproject / detection / layer3 / Layer3ClusterMatcher.java

diff --git a/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer3/Layer3ClusterMatcher.java b/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer3/Layer3ClusterMatcher.java
index 6d81100..165cdb3 100644 (file)
--- a/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer3/Layer3ClusterMatcher.java
+++ b/Code/Projects/PacketLevelSignatureExtractor/src/main/java/edu/uci/iotproject/detection/layer3/Layer3ClusterMatcher.java
@@ -131,13 +131,9 @@ public class Layer3ClusterMatcher extends AbstractClusterMatcher implements Pack
             while ((match = findSubsequenceInSequence(lowerBound, upperBound, cPkts, mClusterMemberDirections, null)).
                     isPresent()) {
                 List<PcapPacket> matchSeq = match.get();
             while ((match = findSubsequenceInSequence(lowerBound, upperBound, cPkts, mClusterMemberDirections, null)).
                     isPresent()) {
                 List<PcapPacket> matchSeq = match.get();

-//                // Notify observers about the match.
-//                mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));
-                if (!matchSeq.get(matchSeq.size()-1).getTimestamp().isAfter(matchSeq.get(0).getTimestamp().
-                        plusMillis(mInclusionTimeMillis))) {
-                    // Notify observers about the match.
-                    mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));
-                }
+                // Notify observers about the match.
+                // Max number of skipped packets in layer 3 is 0 (no skipped packets)
+                mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));

                 /*
                  * Get the index in cPkts of the last packet in the sequence of packets that matches the searched
                  * signature sequence.
                 /*
                  * Get the index in cPkts of the last packet in the sequence of packets that matches the searched
                  * signature sequence.


@@ -178,13 +174,9 @@ public class Layer3ClusterMatcher extends AbstractClusterMatcher implements Pack
                 while ((match = findSubsequenceInSequence(signatureSequence, cPkts, mClusterMemberDirections, null)).
                         isPresent()) {
                     List<PcapPacket> matchSeq = match.get();
                 while ((match = findSubsequenceInSequence(signatureSequence, cPkts, mClusterMemberDirections, null)).
                         isPresent()) {
                     List<PcapPacket> matchSeq = match.get();

-//                    // Notify observers about the match.
-//                    mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));
-                    if (!matchSeq.get(matchSeq.size()-1).getTimestamp().isAfter(matchSeq.get(0).getTimestamp().
-                           plusMillis(mInclusionTimeMillis))) {
-                        // Notify observers about the match.
-                        mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));
-                    }
+                    // Notify observers about the match.
+                    // Max number of skipped packets in layer 3 is 0 (no skipped packets)
+                    mObservers.forEach(o -> o.onMatch(Layer3ClusterMatcher.this, matchSeq));

                     /*
                      * Get the index in cPkts of the last packet in the sequence of packets that matches the searched
                      * signature sequence.
                     /*
                      * Get the index in cPkts of the last packet in the sequence of packets that matches the searched
                      * signature sequence.


@@ -358,12 +350,16 @@ public class Layer3ClusterMatcher extends AbstractClusterMatcher implements Pack
             PcapPacket seqPkt = sequence.get(seqIdx);
             // We only have a match if packet lengths and directions match.
             // The packet lengths have to be in the range of [lowerBound - eps, upperBound+eps]
             PcapPacket seqPkt = sequence.get(seqIdx);
             // We only have a match if packet lengths and directions match.
             // The packet lengths have to be in the range of [lowerBound - eps, upperBound+eps]

-            // TODO: Maybe we could do better here for the double to integer conversion?
-//            int epsLowerBound = lowBndPkt.length() - (int) mEps;
-//            int epsUpperBound = upBndPkt.length() + (int) mEps;
-            // TODO: TEMPORARILY REMOVE EPS BOUNDS
+            // We initialize the lower and upper bounds first

             int epsLowerBound = lowBndPkt.length();
             int epsUpperBound = upBndPkt.length();
             int epsLowerBound = lowBndPkt.length();
             int epsUpperBound = upBndPkt.length();

+            // Do strict matching if the lower and upper bounds are the same length
+            // Do range matching with eps otherwise
+            if (epsLowerBound != epsUpperBound) {
+                // TODO: Maybe we could do better here for the double to integer conversion?
+                epsLowerBound = epsLowerBound - (int) mEps;
+                epsUpperBound = epsUpperBound + (int) mEps;
+            }

             if (epsLowerBound <= seqPkt.getOriginalLength() &&
                     seqPkt.getOriginalLength() <= epsUpperBound &&
                     subsequenceDirections[subseqIdx] == sequenceDirections[seqIdx]) {
             if (epsLowerBound <= seqPkt.getOriginalLength() &&
                     seqPkt.getOriginalLength() <= epsUpperBound &&
                     subsequenceDirections[subseqIdx] == sequenceDirections[seqIdx]) {