Add back fragmentation detection

src/server.c

@@ -591,6 +591,12 @@ server_recv_cb(EV_P_ ev_io *w, int revents)
         close_and_free_server(EV_A_ server);
         return;
     } else if (err == CRYPTO_NEED_MORE) {
+        if (server->stage != STAGE_STREAM && server->frag > 1) {
+            report_addr(server->fd, MALICIOUS, "malicious fragmentation");
+            close_and_free_remote(EV_A_ remote);
+            close_and_free_server(EV_A_ server);
+        }
+        server->frag++;
         return;
     }