From: Vladimír Čunát <vladimir.cunat@nic.cz>
Date: Tue, 31 Jan 2017 13:25:29 +0000 (+0100)
Subject: lua: make the map command check its arguments
X-Git-Tag: v1.2.1~4^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cba5a923f83f9345693ae85a8181115fec5d30f1;p=thirdparty%2Fknot-resolver.git

lua: make the map command check its arguments

Fixes #147.
---

diff --git a/daemon/engine.c b/daemon/engine.c
index 9b53b1bc9..21cf15904 100644
--- a/daemon/engine.c
+++ b/daemon/engine.c
@@ -376,6 +376,11 @@ static int l_tojson(lua_State *L)
 
 static int l_map(lua_State *L)
 {
+	if (lua_gettop(L) != 1 || !lua_isstring(L, 1)) {
+		lua_pushliteral(L, "map('string with a lua expression')");
+		lua_error(L);
+	}
+
 	struct engine *engine = engine_luaget(L);
 	const char *cmd = lua_tostring(L, 1);
 	uint32_t len = strlen(cmd);