Avoid "Unknown command" messages when receiving getaddr on outbound connections.

Github-Pull: #7642
Rebased-From: d84ea1a59ce3704457a162f1fd8a7353047156de

1 files changed, 11 insertions, 6 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 24d292454b..8a9dae03ab 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5247,13 +5247,18 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
     }
 
 
-    // This asymmetric behavior for inbound and outbound connections was introduced
-    // to prevent a fingerprinting attack: an attacker can send specific fake addresses
-    // to users' AddrMan and later request them by sending getaddr messages.
-    // Making nodes which are behind NAT and can only make outgoing connections ignore
-    // the getaddr message mitigates the attack.
-    else if ((strCommand == NetMsgType::GETADDR) && (pfrom->fInbound))
+    else if (strCommand == NetMsgType::GETADDR)
     {
+        // This asymmetric behavior for inbound and outbound connections was introduced
+        // to prevent a fingerprinting attack: an attacker can send specific fake addresses
+        // to users' AddrMan and later request them by sending getaddr messages.
+        // Making nodes which are behind NAT and can only make outgoing connections ignore
+        // the getaddr message mitigates the attack.
+        if (!pfrom->fInbound) {
+            LogPrint("net", "Ignoring \"getaddr\" from outbound connection. peer=%d\n", pfrom->id);
+            return true;
+        }
+
         pfrom->vAddrToSend.clear();
         vector<CAddress> vAddr = addrman.GetAddr();
         BOOST_FOREACH(const CAddress &addr, vAddr)