Merge pull request #7072

bc7cd78 p2p: drop peers that spam peer lists (moneromooo-monero)

src/cryptonote_config.h

@@ -132,6 +132,7 @@
 #define P2P_DEFAULT_HANDSHAKE_INTERVAL                  60           //secondes
 #define P2P_DEFAULT_PACKET_MAX_SIZE                     50000000     //50000000 bytes maximum packet size
 #define P2P_DEFAULT_PEERS_IN_HANDSHAKE                  250
+#define P2P_MAX_PEERS_IN_HANDSHAKE                      250
 #define P2P_DEFAULT_CONNECTION_TIMEOUT                  5000       //5 seconds
 #define P2P_DEFAULT_SOCKS_CONNECT_TIMEOUT               45         // seconds
 #define P2P_DEFAULT_PING_CONNECTION_TIMEOUT             2000       //2 seconds

src/p2p/net_node.inl

@@ -2064,6 +2064,11 @@ namespace nodetool
   template<class t_payload_net_handler>
   bool node_server<t_payload_net_handler>::handle_remote_peerlist(const std::vector<peerlist_entry>& peerlist, const epee::net_utils::connection_context_base& context)
   {
+    if (peerlist.size() > P2P_MAX_PEERS_IN_HANDSHAKE)
+    {
+      MWARNING(context << "peer sent " << peerlist.size() << " peers, considered spamming");
+      return false;
+    }
     std::vector<peerlist_entry> peerlist_ = peerlist;
     if(!sanitize_peerlist(peerlist_))
       return false;