don't segfault on the line "drill bla @"

diff --git a/drill/drill.c b/drill/drill.c
index 603150817863d854a90e66651ce5fefe62b6fd32..e7faf8508d031b618754d0623f3f0110bf4b05be 100644 (file)
--- a/drill/drill.c
+++ b/drill/drill.c
@@ -342,7 +342,7 @@ main(int argc, char *argv[])
                }
        } else {
                res = ldns_resolver_new();
-               if (!res) {
+               if (!res || strlen(serv) <= 0) {
                        result = EXIT_FAILURE;
                        goto exit;
                }