Added fix for valid mac address required

Author: stealthcopter

library/src/main/java/com/stealthcopter/networktools/ARPInfo.java

@@ -10,14 +10,13 @@
 
 /**
  * Created by mat on 09/12/15.
- *
+ * <p/>
  * Looks at the file at /proc/net/arp to find ip/mac addresses from the cache
  * We assume that the file has this structure:
- *
+ * <p/>
  * IP address       HW type     Flags       HW address            Mask     Device
  * 192.168.18.11    0x1         0x2         00:04:20:06:55:1a     *        eth0
  * 192.168.18.36    0x1         0x2         00:22:43:ab:2a:5b     *        eth0
- *
  */
 public class ARPInfo {
 
@@ -28,11 +27,12 @@ public class ARPInfo {
      * @param ip - IP address to search for
      * @return the MAC from the ARP cache or null in format "01:23:45:67:89:ab"
      */
-    @Nullable public static String getMACFromIPAddress(String ip) {
+    @Nullable
+    public static String getMACFromIPAddress(String ip) {
         if (ip == null)
             return null;
 
-        for(String line : getLinesInARPCache()) {
+        for (String line : getLinesInARPCache()) {
             String[] splitted = line.split(" +");
             if (splitted.length >= 4 && ip.equals(splitted[0])) {
                 String mac = splitted[3];
@@ -54,16 +54,17 @@ public class ARPInfo {
      * @param macAddress in format "01:23:45:67:89:ab" to search for
      * @return the IP address found or null in format "192.168.0.1"
      */
-    @Nullable public static String getIPAddressFromMAC(String macAddress) {
+    @Nullable
+    public static String getIPAddressFromMAC(String macAddress) {
         if (macAddress == null) {
             return null;
         }
 
-        if (!macAddress.matches("..:..:..:..:..:..")){
+        if (!macAddress.matches("..:..:..:..:..:..")) {
             throw new IllegalArgumentException("Invalid MAC Address");
         }
 
-        for(String line : getLinesInARPCache()) {
+        for (String line : getLinesInARPCache()) {
             String[] splitted = line.split(" +");
             if (splitted.length >= 4 && macAddress.equals(splitted[3])) {
                 String ipAddress = splitted[0];
@@ -78,9 +79,9 @@ public class ARPInfo {
      *
      * @return list of IP addresses found
      */
-    public static ArrayList<String> getAllIPAddressesInARPCache(){
+    public static ArrayList<String> getAllIPAddressesInARPCache() {
         ArrayList<String> ipList = new ArrayList<>();
-        for(Pair<String, String> ipMacPair : getAllIPAndMACAddressesInARPCache()) {
+        for (Pair<String, String> ipMacPair : getAllIPAndMACAddressesInARPCache()) {
             ipList.add(ipMacPair.first);
         }
         return ipList;
@@ -91,9 +92,9 @@ public static ArrayList<String> getAllIPAddressesInARPCache(){
      *
      * @return list of MAC addresses found
      */
-    public static ArrayList<String> getAllMACAddressesInARPCache(){
+    public static ArrayList<String> getAllMACAddressesInARPCache() {
         ArrayList<String> macList = new ArrayList<>();
-        for(Pair<String, String> ipMacPair : getAllIPAndMACAddressesInARPCache()) {
+        for (Pair<String, String> ipMacPair : getAllIPAndMACAddressesInARPCache()) {
             macList.add(ipMacPair.first);
         }
         return macList;
@@ -105,13 +106,14 @@ public static ArrayList<String> getAllMACAddressesInARPCache(){
      *
      * @return list of IP/MAC address pairs found
      */
-    public static ArrayList<Pair<String, String>> getAllIPAndMACAddressesInARPCache(){
+    public static ArrayList<Pair<String, String>> getAllIPAndMACAddressesInARPCache() {
         ArrayList<Pair<String, String>> macList = new ArrayList<>();
-        for(String line : getLinesInARPCache()) {
+        for (String line : getLinesInARPCache()) {
             String[] splitted = line.split(" +");
             if (splitted.length >= 4) {
-                // Ignore invalid MAC addresses as they have not been found
-                if (!splitted[3].equals("00:00:00:00:00:00")) {
+                // Ignore values with invalid MAC addresses
+                if (splitted[3].matches("..:..:..:..:..:..")
+                        && !splitted[3].equals("00:00:00:00:00:00")) {
                     macList.add(new Pair<>(splitted[0], splitted[3]));
                 }
             }
@@ -121,9 +123,10 @@ public static ArrayList<Pair<String, String>> getAllIPAndMACAddressesInARPCache(
 
     /**
      * Method to read lines from the ARP Cache
+     *
      * @return the lines of the ARP Cache.
      */
-    private static ArrayList<String> getLinesInARPCache(){
+    private static ArrayList<String> getLinesInARPCache() {
         ArrayList<String> lines = new ArrayList<>();
         BufferedReader br = null;
         try {

readme.md

@@ -38,7 +38,7 @@ then add a library dependency. **Remember** to check for latest release [here](h
 
 ```groovy
     dependencies {
-        compile 'com.github.stealthcopter:AndroidNetworkTools:0.1.1'
+        compile 'com.github.stealthcopter:AndroidNetworkTools:0.1.2'
     }
 ```