1 files changed, 11 insertions, 0 deletions
diff --git a/server/server.go b/server/server.go
index a7a08ca..bc12b5f 100644
--- a/server/server.go
+++ b/server/server.go
@@ -20,10 +20,12 @@ var supportedExtensions = []string {
 	"HackControl",
 	"LongerMessages",
 	"FullCP437",
+	"CustomBlocks",
 }
 var requiredExtensions = []string {
 	"ExtEntityPositions",
 	"EnvMapAspect.2",
+	"CustomBlocks",
 }
 
 type ServerInfo struct {
@@ -502,6 +504,15 @@ func (cl *client) cpeHandshake(conn net.Conn, ext map[string]bool) bool {
 			cl.disconnect("Missing required extension: " + req)
 		}
 	}
+
+	err = classic.WritePacket(conn, &classic.CustomBlocksSupportLevel {
+		SupportLevel: 1,
+	})
+	if cl.handleError(err) != nil {
+		return false
+	}
+	// it doesn't matter what the client sends in response to this
+
 	cl.extensions = ext
 	return true
 }