--- /dev/null
+package edu.uci.iotproject;
+
+import org.pcap4j.packet.Packet;
+import org.pcap4j.packet.DnsPacket;
+import org.pcap4j.packet.DnsResourceRecord;
+import org.pcap4j.packet.namednumber.DnsResourceRecordType;
+
+import java.io.EOFException;
+import java.net.Inet4Address;
+import java.net.UnknownHostException;
+import java.time.Instant;
+import java.util.*;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * This is a class that does DNS mapping.
+ * Basically an IP address is mapped to its
+ * respective DNS hostnames.
+ *
+ * @author Rahmadi Trimananda (rtrimana@uci.edu)
+ * @version 0.1
+ */
+public class DnsMap {
+
+ /* Class properties */
+ private Map<String, Set<String>> ipToHostnameMap;
+
+ /* Class constants */
+ private static final Set<String> EMPTY_SET = Collections.unmodifiableSet(new HashSet<>());
+
+
+ /* Constructor */
+ public DnsMap() {
+
+ ipToHostnameMap = new HashMap<String, Set<String>>();
+ }
+
+
+ /**
+ * Gets a packet and determine if this is a DNS packet
+ *
+ * @param packet Packet object
+ * @return DnsPacket object or null
+ */
+ private DnsPacket getDnsPacket(Packet packet) {
+
+ DnsPacket dnsPacket = packet.get(DnsPacket.class);
+ return dnsPacket;
+ }
+
+
+ /**
+ * Checks DNS packet and build the map data structure that
+ * maps IP addresses to DNS hostnames
+ *
+ * @param packet Packet object
+ */
+ public void validateAndAddNewEntry(Packet packet) throws UnknownHostException {
+
+ // Make sure that this is a DNS packet
+ DnsPacket dnsPacket = getDnsPacket(packet);
+ if (dnsPacket != null) {
+
+ // We only care about DNS answers
+ if (dnsPacket.getHeader().getAnswers().size() != 0) {
+
+ String hostname = dnsPacket.getHeader().getQuestions().get(0).getQName().getName();
+ for(DnsResourceRecord answer : dnsPacket.getHeader().getAnswers()) {
+ // We only care about type A records
+ if (!answer.getDataType().equals(DnsResourceRecordType.A))
+ continue;
+ // Sanity check. For some reason the hostname appears to be the empty string in the answer .
+ // We hence have to assume that all answers correspond to a single question that holds the hostname as part of its object tree.
+ // Therefore, if there are more questions in one query-reply exchange, we are in trouble.
+ if (!answer.getName().getName().equals("") && !answer.getName().getName().equals(hostname))
+ throw new RuntimeException("[DNS parser] mismatch between hostname in question and hostname in answer");
+ // The IP in byte representation.
+ byte[] ipBytes = answer.getRData().getRawData();
+ // Convert to string representation.
+ String ip = Inet4Address.getByAddress(ipBytes).getHostAddress();
+ Set<String> hostnameSet = new HashSet<String>();
+ hostnameSet.add(hostname);
+ // Update or insert depending on presence of key:
+ // Concat the existing set and the new set if ip already present as key,
+ // otherwise add an entry for ip pointing to new set.
+ ipToHostnameMap.merge(ip, hostnameSet, (v1, v2) -> { v1.addAll(v2); return v1; });
+ }
+ }
+ }
+ }
+
+
+ /**
+ * Checks DNS packet and build the map data structure that
+ * maps IP addresses to DNS hostnames
+ *
+ * @param address Address to check
+ * @param hostname Hostname to check
+ */
+ public boolean isRelatedToCloudServer(String address, String hostname) {
+
+ return ipToHostnameMap.getOrDefault(address, EMPTY_SET).contains(hostname);
+ }
+}
import org.pcap4j.packet.IpV4Packet;
import org.pcap4j.packet.Packet;
import org.pcap4j.packet.TcpPacket;
+import org.pcap4j.packet.DnsPacket;
import java.io.EOFException;
+import java.net.UnknownHostException;
import java.time.Instant;
import java.util.*;
import java.util.concurrent.TimeoutException;
*/
public class FlowPatternFinder {
- private final Map<String, Set<String>> dnsMap;
+ /* Class properties */
private final Map<Conversation, List<PcapPacket>> connections = new HashMap<>();
-
- public FlowPatternFinder(Map<String, Set<String>> dnsMap) {
- this.dnsMap = Objects.requireNonNull(dnsMap);
+
+ private DnsMap dnsMap;
+
+ public FlowPatternFinder() {
+ this.dnsMap = new DnsMap();
}
- private static final Set<String> EMPTY_SET = Collections.unmodifiableSet(new HashSet<>());
-
// TODO clean up exceptions etc.
public void findFlowPattern(PcapHandle pcap, FlowPattern pattern)
throws PcapNativeException, NotOpenException, TimeoutException {
+ int counter = 0;
try {
PcapPacket packet;
-
while ((packet = pcap.getNextPacketEx()) != null) {
+ // Check if this is a valid DNS packet
+ dnsMap.validateAndAddNewEntry(packet);
// For now, we only work support pattern search in TCP over IPv4.
IpV4Packet ipPacket = packet.get(IpV4Packet.class);
TcpPacket tcpPacket = packet.get(TcpPacket.class);
int srcPort = tcpPacket.getHeader().getSrcPort().valueAsInt();
int dstPort = tcpPacket.getHeader().getDstPort().valueAsInt();
// Is this packet related to the pattern and coming from the cloud server?
- boolean fromServer = dnsMap.getOrDefault(srcAddress, EMPTY_SET).contains(pattern.getHostname());
+ boolean fromServer = dnsMap.isRelatedToCloudServer(srcAddress, pattern.getHostname());
// Is this packet related to the pattern and going to the cloud server?
- boolean fromClient = dnsMap.getOrDefault(dstAddress, EMPTY_SET).contains(pattern.getHostname());
+ boolean fromClient = dnsMap.isRelatedToCloudServer(dstAddress, pattern.getHostname());
if (!fromServer && !fromClient) {
// Packet not related to pattern, skip it.
continue;
// TODO: this is strictly not sufficient to differentiate one TCP session from another, but should suffice for now.
Conversation conversation = fromClient ? new Conversation(srcAddress, srcPort, dstAddress, dstPort) :
new Conversation(dstAddress, dstPort, srcAddress, srcPort);
- List<PcapPacket> listWrappedPacket = new ArrayList<>();
+ List<PcapPacket> listWrappedPacket = new ArrayList<>();
listWrappedPacket.add(packet);
// Create new conversation entry, or append packet to existing.
connections.merge(conversation, listWrappedPacket, (v1, v2) -> {
} catch (EOFException eofe) {
System.out.println("findFlowPattern: finished processing entire file");
find(pattern);
+ } catch (UnknownHostException ex) {
+ System.out.println();
+ ex.printStackTrace();
}
}
package edu.uci.iotproject;
-
import org.pcap4j.core.*;
import org.pcap4j.packet.*;
import org.pcap4j.packet.DnsPacket;
public static void main(String[] args) throws PcapNativeException, NotOpenException, EOFException, TimeoutException, UnknownHostException {
- final String fileName = "/users/varmarken/Desktop/wlan1.local.dns.pcap";
- List<DnsPacket> dnsPackets = extractDnsAnswerPackets(fileName);
- Map<String, Set<String>> ipToHostnameMap = constructIpToHostnameMap(dnsPackets);
-// ipToHostnameMap.forEach((k,v) -> System.out.println(String.format("%s => %s", k, v.toString())));
-
+ //final String fileName = "/users/varmarken/Desktop/wlan1.local.dns.pcap";
+ final String fileName = "/home/rtrimana/pcap_processing/smart_home_traffic/Code/Projects/SmartPlugDetector/pcap/wlan1.local.dns.pcap";
// ====== Debug code ======
PcapHandle handle;
} catch (PcapNativeException pne) {
handle = Pcaps.openOffline(fileName);
}
- FlowPatternFinder fpf = new FlowPatternFinder(ipToHostnameMap);
+ FlowPatternFinder fpf = new FlowPatternFinder();
fpf.findFlowPattern(handle, FlowPattern.TP_LINK_LOCAL_ON);
// ========================
}
-
- /**
- * Opens a PCAP file and extracts all DNS reply packets with non-empty answer sections.
- * @param pcapFileName The name of the PCAP file.
- * @return A list of DNS reply packets.
- * @throws PcapNativeException
- * @throws NotOpenException
- * @throws TimeoutException
- */
- private static List<DnsPacket> extractDnsAnswerPackets(String pcapFileName) throws PcapNativeException, NotOpenException, TimeoutException {
- PcapHandle handle;
- try {
- handle = Pcaps.openOffline(pcapFileName, PcapHandle.TimestampPrecision.NANO);
- } catch (PcapNativeException pne) {
- handle = Pcaps.openOffline(pcapFileName);
- }
- // Apparently BPFs don't support "dns" protocol filter, so have to filter by port.
- handle.setFilter("port 53", BpfProgram.BpfCompileMode.OPTIMIZE);
- ArrayList<DnsPacket> result = new ArrayList<>();
- try {
- Packet packet;
- while ((packet = handle.getNextPacketEx()) != null) {
- DnsPacket dnsPacket = packet.get(DnsPacket.class);
- // We only care about DNS answers.
- if (dnsPacket != null && dnsPacket.getHeader().getAnswers().size() != 0) {
- result.add(dnsPacket);
- }
- }
- } catch (EOFException eof) {
- // (Note have to resort to EOFException as handle.getStats().getNumPacketsCaptured() only works on Windows)
- // Clean up.
- handle.close();
- }
- System.out.println(String.format("Found %d DNS answers", result.size()));
- return result;
- }
-
- /**
- * Based on the information found in a list of DNS replies, this method constructs a {@link Map} that maps from an
- * IP to a {@link Set} of hostnames associated with that IP.
- *
- * @param dnsPackets A list of DNS <em>reply</em> packets.
- * @return A {@link Map} that maps from an IP to a {@link Set} of hostnames associated with that IP
- * @throws UnknownHostException If an IP found in a {@code DnsPacket} is of incorrect length.
- */
- private static Map<String, Set<String>> constructIpToHostnameMap(List<DnsPacket> dnsPackets) throws UnknownHostException {
- HashMap<String, Set<String>> result = new HashMap<>();
- for(DnsPacket dnsPacket : dnsPackets) {
- // The hostname that this DNS reply provides answers for.
- // TODO: safe to assume only one question?
- String hostname = dnsPacket.getHeader().getQuestions().get(0).getQName().getName();
- for(DnsResourceRecord answer : dnsPacket.getHeader().getAnswers()) {
- // We only care about type A records
- if (!answer.getDataType().equals(DnsResourceRecordType.A)) {
- continue;
- }
- // Sanity check. For some reason the hostname appears to be the empty string in the answer .
- // We hence have to assume that all answers correspond to a single question that holds the hostname as part of its object tree.
- // Therefore, if there are more questions in one query-reply exchange, we are in trouble.
- if (!answer.getName().getName().equals("") && !answer.getName().getName().equals(hostname)) {
- throw new RuntimeException("[DNS parser] mismatch between hostname in question and hostname in answer");
- }
- // The IP in byte representation.
- byte[] ipBytes = answer.getRData().getRawData();
- // Convert to string representation.
- String ip = Inet4Address.getByAddress(ipBytes).getHostAddress();
- HashSet<String> hostnameSet = new HashSet<>();
- hostnameSet.add(hostname);
- // Update or insert depending on presence of key:
- // Concat the existing set and the new set if ip already present as key,
- // otherwise add an entry for ip pointing to new set.
- result.merge(ip, hostnameSet, (v1, v2) -> { v1.addAll(v2); return v1; });
- }
- }
- return result;
- }
-
-
-
-// /**
-// * Private class properties
-// */
-// private Pcap pcap;
-// private List<Pcap.Packet> listPacket;
-// private Map<String, String> mapIPAddressToHostname;
-//
-// /**
-// * Private class constants
-// */
-// private static final int DNS_PORT = 53;
-//
-// /**
-// * Constructor
-// *
-// * @param file name of the analyzed PCAP file
-// */
-// public Main(String file) throws IOException {
-//
-// pcap = Pcap.fromFile(file);
-// listPacket = pcap.packets();
-// mapIPAddressToHostname = new HashMap<String, String>();
-// }
-//
-//
-//
-//
-//
-// /**
-// * Private method that maps DNS hostnames to their
-// * respected IP addresses. This method iterates
-// * through the List<Pcap.Packet>, gets DNS packets,
-// * and gets the IP addresses associated with them.
-// */
-// private void mapHostnamesToIPAddresses() {
-//
-// int counter = 1;
-// for(Pcap.Packet packet : listPacket) {
-// System.out.print("# " + counter++);
-// // Check the packet type
-// if (packet._root().hdr().network() == Pcap.Linktype.ETHERNET) {
-// EthernetFrame ethFrame = (EthernetFrame) packet.body();
-// if (ethFrame.etherType() == EthernetFrame.EtherTypeEnum.IPV4) {
-// Ipv4Packet ip4Packet = (Ipv4Packet) ethFrame.body();
-//
-// System.out.print(" - Protocol: " + ip4Packet.protocol());
-// if (ip4Packet.protocol() == Ipv4Packet.ProtocolEnum.UDP) {
-// // DNS is UDP port 53
-// UdpDatagram udpData = (UdpDatagram) ip4Packet.body();
-// System.out.print(" - Source Port: " + udpData.srcPort());
-// System.out.print(" - Dest Port: " + udpData.dstPort());
-//
-// // Source port 53 means this is DNS response
-// if (udpData.srcPort() == DNS_PORT) {
-// KaitaiStream dnsStream = new ByteBufferKaitaiStream(udpData.body());
-// DnsPacket dnsPacket = new DnsPacket(dnsStream);
-// ArrayList<DnsPacket.Query> queries = dnsPacket.queries();
-// ArrayList<DnsPacket.Answer> answers = dnsPacket.answers();
-// String strDomainName = new String();
-// for(DnsPacket.Query query : queries) {
-// System.out.print(" - Queries: ");
-// DnsPacket.DomainName domainName = query.name();
-// ArrayList<DnsPacket.Label> labels = domainName.name();
-// for(int i = 0; i < labels.size(); i++) {
-// System.out.print(labels.get(i).name());
-// strDomainName = strDomainName + labels.get(i).name();
-// if(i < labels.size()-2) {
-// System.out.print(".");
-// strDomainName = strDomainName + ".";
-// }
-// }
-// break; // We are assuming that there is only one query
-// }
-// System.out.print(" - Answers " + answers.size());
-// for(DnsPacket.Answer answer : answers) {
-// System.out.print(" - TypeType: " + answer.type());
-// System.out.print(" - ClassType: " + answer.answerClass());
-// System.out.print("\n - Answers: ");
-// DnsPacket.Address address = answer.address();
-// if (answer.type() == DnsPacket.TypeType.A) {
-// String strAnswer = new String();
-// ArrayList<Integer> ipList = address.ip();
-// for(int i = 0; i < ipList.size(); i++) {
-// System.out.print(ipList.get(i));
-// strAnswer = strAnswer + Integer.toString(ipList.get(i));
-// if(i < ipList.size()-1) {
-// System.out.print(".");
-// strAnswer = strAnswer + ".";
-// }
-// }
-// mapIPAddressToHostname.put(strAnswer, strDomainName);
-// }
-// }
-// }
-// }
-// }
-// }
-// System.out.println();
-// }
-//// for(Map.Entry<String, String> entry : mapIPAddressToHostname.entrySet()) {
-//// if (entry.getValue().equals("devs.tplinkcloud.com")) {
-//// System.out.println(entry.getKey() + " - " + entry.getValue());
-//// }
-//// }
-// System.out.println("Total map size: " + mapIPAddressToHostname.size());
-// System.out.println("Answer for 13.33.41.8: " + mapIPAddressToHostname.get("13.33.41.8"));
-// System.out.println("Answer for 34.226.240.125: " + mapIPAddressToHostname.get("34.226.240.125"));
-// }
-//
-// /*private String cloudIPAddress(String hostName) {
-// if (hostName.equals("events.tplinkra.com"))
-// return "205.251.203.26";
-// else
-// return null;
-// }*/
-//
-// // TODO move to separate class
-// // Add parameter that is the trace to be analyzed (most like the pcap library's representation of a flow)
-// public String findPattern(Map<String, List<Integer>> hostnameToPacketLengths, String smartPlugIp) {
-//
-// // No difference, output "Complete match"
-// // If difference, output <Packet no, deviation from expected> for each packet
-// return null;
-// }
-//
-// public static void main(String[] args) {
-// System.out.println("it works");
-//
-// //String file = "/home/rtrimana/pcap_processing/smart_home_traffic/Code/Projects/SmartPlugDetector/pcap/wlan1.local.dns.pcap";
-// String file = "/home/rtrimana/pcap_processing/smart_home_traffic/Code/Projects/SmartPlugDetector/pcap/wlan1.remote.dns.pcap";
-//
-// try {
-// Main main = new Main(file);
-// main.mapHostnamesToIPAddresses();
-//
-// /*Pcap data = Pcap.fromFile(file);
-// List<Pcap.Packet> listPacket = data.packets();
-// System.out.println("Number of packets: " + listPacket.size());
-// System.out.println("===================");
-// for(Pcap.Packet packet : listPacket) {
-// if (packet._root().hdr().network() == Pcap.Linktype.ETHERNET) {
-// EthernetFrame eFrame = (EthernetFrame) packet.body();
-// if (eFrame.etherType() == EthernetFrame.EtherTypeEnum.IPV4) {
-// Ipv4Packet ip4Packet = (Ipv4Packet) eFrame.body();
-// byte[] srcIp = ip4Packet.srcIpAddr();
-// byte[] dstIp = ip4Packet.dstIpAddr();
-// System.out.println("Byte length source: " + srcIp.length + " Byte length dest: " + dstIp.length);
-// System.out.print("Source: ");
-// for(int i = 0; i < srcIp.length; i++) {
-// System.out.print(Byte.toUnsignedInt(srcIp[i]));
-// if(i < srcIp.length-1)
-// System.out.print(".");
-// }
-// System.out.print(" - Dest: ");
-// for(int i = 0; i < dstIp.length; i++) {
-// System.out.print(Byte.toUnsignedInt(dstIp[i]));
-// if(i < dstIp.length-1)
-// System.out.print(".");
-// else
-// System.out.println("\n");
-// }
-// }
-// }
-// }*/
-//
-// } catch (Exception e) {
-// e.printStackTrace();
-// }
-// }
}
projects / pingpong.git / commitdiff