Add method to parse an IP address from a DCC command.

diff --git a/src/main/java/net/pterodactylus/irc/Connection.java b/src/main/java/net/pterodactylus/irc/Connection.java
index ade43c9..eacf75e 100644 (file)
--- a/src/main/java/net/pterodactylus/irc/Connection.java
+++ b/src/main/java/net/pterodactylus/irc/Connection.java
@@ -27,7 +27,9 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
+import java.net.InetAddress;
 import java.net.Socket;
+import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -56,6 +58,7 @@ import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.eventbus.EventBus;
 import com.google.common.io.Closeables;
+import com.google.common.primitives.Longs;
 import com.google.common.util.concurrent.AbstractExecutionThreadService;
 import com.google.common.util.concurrent.Service;
 
@@ -415,6 +418,32 @@ public class Connection extends AbstractExecutionThreadService implements Servic
                return Optional.absent();
        }
 
+       /**
+        * Parses the given {@code ip} and returns an {@link InetAddress} from it.
+        *
+        * @param ip
+        *              The IP to parse
+        * @return The parsed inet address, or {@link Optional#absent()} if no inet
+        *         address could be parsed
+        */
+       private Optional<InetAddress> parseInetAddress(String ip) {
+               Long ipNumber = Longs.tryParse(ip);
+               if (ipNumber == null) {
+                       return Optional.absent();
+               }
+
+               StringBuilder hostname = new StringBuilder(15);
+               hostname.append((ipNumber >>> 24) & 0xff).append('.');
+               hostname.append((ipNumber >>> 16) & 0xff).append('.');
+               hostname.append((ipNumber >>> 8) & 0xff).append('.');
+               hostname.append(ipNumber & 0xff);
+               try {
+                       return Optional.of(InetAddress.getByName(hostname.toString()));
+               } catch (UnknownHostException uhe1) {
+                       return Optional.absent();
+               }
+       }
+
        /** Handles input and output for the connection. */
        private class ConnectionHandler implements Closeable {