Paper/CraftBukkit-Patches/0004-Proxy-IP-Filter.patch

From 5877b5f20080c1630241b6ab62c94bc6dfa7a44a Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Tue, 23 Apr 2013 11:22:07 +1000
Subject: [PATCH] Proxy IP Filter


diff --git a/src/main/java/net/minecraft/server/ThreadLoginVerifier.java b/src/main/java/net/minecraft/server/ThreadLoginVerifier.java
index 0686ba0..9ed3db5 100644
--- a/src/main/java/net/minecraft/server/ThreadLoginVerifier.java
+++ b/src/main/java/net/minecraft/server/ThreadLoginVerifier.java
@@ -28,6 +28,7 @@ class ThreadLoginVerifier extends Thread {
 
     public void run() {
         try {
+            org.bukkit.craftbukkit.Spigot.filterIp(pendingConnection); // Spigot
             String s = (new BigInteger(MinecraftEncryption.a(PendingConnection.a(this.pendingConnection), PendingConnection.b(this.pendingConnection).F().getPublic(), PendingConnection.c(this.pendingConnection)))).toString(16);
             URL url = new URL("http://session.minecraft.net/game/checkserver.jsp?user=" + URLEncoder.encode(PendingConnection.d(this.pendingConnection), "UTF-8") + "&serverId=" + URLEncoder.encode(s, "UTF-8"));
             BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(url.openStream()));
diff --git a/src/main/java/org/bukkit/craftbukkit/Spigot.java b/src/main/java/org/bukkit/craftbukkit/Spigot.java
index 2cd806e..82dc5c8 100644
--- a/src/main/java/org/bukkit/craftbukkit/Spigot.java
+++ b/src/main/java/org/bukkit/craftbukkit/Spigot.java
@@ -1,19 +1,47 @@
 package org.bukkit.craftbukkit;
 
+import java.net.InetAddress;
+import net.minecraft.server.PendingConnection;
 import org.bukkit.command.SimpleCommandMap;
 import org.bukkit.configuration.file.YamlConfiguration;
 
 public class Spigot {
 
+    private static boolean filterIps;
+
     public static void initialize(CraftServer server, SimpleCommandMap commandMap, YamlConfiguration configuration) {
         server.whitelistMessage = configuration.getString("settings.whitelist-message", server.whitelistMessage);
         server.stopMessage = configuration.getString("settings.stop-message", server.stopMessage);
         server.logCommands = configuration.getBoolean("settings.log-commands", true);
         server.commandComplete = configuration.getBoolean("settings.command-complete", true);
         server.spamGuardExclusions = configuration.getStringList("settings.spam-exclusions");
+        filterIps = configuration.getBoolean("settings.filter-unsafe-ips", false);
 
         if (server.chunkGCPeriod == 0) {
             server.getLogger().severe("[Spigot] You should not disable chunk-gc, unexpected behaviour may occur!");
         }
     }
+
+    public static void filterIp(PendingConnection con) {
+        if (filterIps) {
+            try {
+                InetAddress address = con.getSocket().getInetAddress();
+                String ip = address.getHostAddress();
+
+                if (!address.isLoopbackAddress()) {
+                    String[] split = ip.split("\\.");
+                    StringBuilder lookup = new StringBuilder();
+                    for (int i = split.length - 1; i >= 0; i--) {
+                        lookup.append(split[i]);
+                        lookup.append(".");
+                    }
+                    lookup.append("xbl.spamhaus.org.");
+                    if (InetAddress.getByName(lookup.toString()) != null) {
+                        con.disconnect("Your IP address (" + ip + ") is flagged as unsafe by spamhaus.org/xbl");
+                    }
+                }
+            } catch (Exception ex) {
+            }
+        }
+    }
 }
diff --git a/src/main/resources/configurations/bukkit.yml b/src/main/resources/configurations/bukkit.yml
index f2ce75e..b7c0376 100644
--- a/src/main/resources/configurations/bukkit.yml
+++ b/src/main/resources/configurations/bukkit.yml
@@ -30,6 +30,7 @@ settings:
     command-complete: true
     spam-exclusions:
        - /skill
+    filter-unsafe-ips: false
 world-settings:
     default:
         growth-chunks-per-tick: 650
-- 
1.8.2.1