From 339454370587c7257e177670fc57cd5b1a79d4e0 Mon Sep 17 00:00:00 2001
From: CalDescent <caldescent@protonmail.com>
Date: Wed, 5 Jan 2022 19:22:24 +0000
Subject: [PATCH] Don't save arbitrary peer data if it's a local address

---
 .../org/qortal/data/network/ArbitraryPeerData.java | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/main/java/org/qortal/data/network/ArbitraryPeerData.java b/src/main/java/org/qortal/data/network/ArbitraryPeerData.java
index 4185c390..30f8cf24 100644
--- a/src/main/java/org/qortal/data/network/ArbitraryPeerData.java
+++ b/src/main/java/org/qortal/data/network/ArbitraryPeerData.java
@@ -5,6 +5,9 @@ import org.qortal.crypto.Crypto;
 import org.qortal.network.Peer;
 import org.qortal.utils.NTP;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
 public class ArbitraryPeerData {
 
     private final byte[] hash;
@@ -51,6 +54,17 @@ public class ArbitraryPeerData {
             return false;
         }
 
+        // Make sure that it's not a local address
+        try {
+            InetAddress addr = InetAddress.getByName(host);
+            if (addr.isLoopbackAddress() || addr.isLinkLocalAddress() || addr.isSiteLocalAddress()) {
+                // Ignore local addresses
+                return false;
+            }
+        } catch (UnknownHostException e) {
+            return false;
+        }
+
         // Valid host/port combination
         return true;
     }