From d69d5945a71d152bfdfc6649528ebf698867ffef Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 10 Apr 2013 06:31:02 +0200
Subject: [PATCH] Add method to parse an IP address from a DCC command.

---
 .../java/net/pterodactylus/irc/Connection.java     | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/main/java/net/pterodactylus/irc/Connection.java b/src/main/java/net/pterodactylus/irc/Connection.java
index ade43c9..eacf75e 100644
--- 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 {
 
-- 
2.7.4