linux raw ip support

G-Earth/src/main/java/gearth/protocol/hostreplacer/ipmapping/EmptyIpMapper.java

@@ -4,7 +4,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 // Temporary class for the sake of not getting nullpointers on linux&mac until they have an IpMapper as well
-public class EmptyIpMapper implements IpMapper {
+public class EmptyIpMapper extends IpMapper {
     @Override
     public void enable() {
 

G-Earth/src/main/java/gearth/protocol/hostreplacer/ipmapping/IpMapper.java

@@ -1,16 +1,27 @@
 package gearth.protocol.hostreplacer.ipmapping;
 
+import java.io.IOException;
 import java.util.List;
 
 // always map to 127.0.0.1, same port
-public interface IpMapper {
+public abstract class IpMapper {
 
-    void enable();
+    void runCommand(String... args) {
+        ProcessBuilder processBuilder = new ProcessBuilder();
+        processBuilder.command(args);
+        try {
+            processBuilder.start();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
 
-    void addMapping(String ip);
+    abstract public void enable();
 
-    void deleteMapping(String ip);
+    abstract public void addMapping(String ip);
 
-    List<String> getCurrentMappings();
+    abstract public void deleteMapping(String ip);
+
+    abstract public List<String> getCurrentMappings();
 
 }

G-Earth/src/main/java/gearth/protocol/hostreplacer/ipmapping/IpMapperFactory.java

@@ -7,6 +7,7 @@ public class IpMapperFactory {
     public static IpMapper get() {
 
         if (OSValidator.isWindows()) return new WindowsIpMapper();
+        if (OSValidator.isUnix()) return new LinuxIpMapper();
 
         return new EmptyIpMapper();
     }

G-Earth/src/main/java/gearth/protocol/hostreplacer/ipmapping/LinuxIpMapper.java

@@ -0,0 +1,27 @@
+package gearth.protocol.hostreplacer.ipmapping;
+
+import java.util.List;
+
+public class LinuxIpMapper extends IpMapper {
+    @Override
+    public void enable() {
+
+    }
+
+    @Override
+    public void addMapping(String ip) {
+        runCommand("iptables", "-t", "nat", "-A", "OUTPUT",
+                "-p", "all", "-d", ip, "-j", "DNAT", "--to-destination", "127.0.0.1");
+    }
+
+    @Override
+    public void deleteMapping(String ip) {
+        runCommand("iptables", "-t", "nat", "-D", "OUTPUT",
+                "-p", "all", "-d", ip, "-j", "DNAT", "--to-destination", "127.0.0.1");
+    }
+
+    @Override
+    public List<String> getCurrentMappings() {
+        return null;
+    }
+}

G-Earth/src/main/java/gearth/protocol/hostreplacer/ipmapping/WindowsIpMapper.java

@@ -4,17 +4,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
-public class WindowsIpMapper implements IpMapper {
-
-    private void runCommand(String... args) {
-        ProcessBuilder processBuilder = new ProcessBuilder();
-        processBuilder.command(args);
-        try {
-            processBuilder.start();
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
+public class WindowsIpMapper extends IpMapper {
 
     @Override
     public void enable() {