From 6b2887e3bfc0e8db1d8149bc95039af43922ffc6 Mon Sep 17 00:00:00 2001 From: Auke Kok Date: Mon, 4 Feb 2019 21:28:00 -0800 Subject: [PATCH] Limit sign length to 512 (~6 lines of 80 char or so). Players can enter unlimited text into the field, causing lag and potentially locking up clients. I have not found any negative effects server side, other than the large storage needed to store the long text. --- mods/default/nodes.lua | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua index ecd8f776..c067eac3 100644 --- a/mods/default/nodes.lua +++ b/mods/default/nodes.lua @@ -2575,12 +2575,19 @@ local function register_sign(material, desc, def) minetest.record_protection_violation(pos, player_name) return end - local meta = minetest.get_meta(pos) - if not fields.text then return end + local text = fields.text + if not text then + return + end + if string.len(text) > 512 then + minetest.chat_send_player(player_name, "Text too long") + return + end minetest.log("action", (player_name or "") .. " wrote \"" .. - fields.text .. "\" to sign at " .. minetest.pos_to_string(pos)) - meta:set_string("text", fields.text) - meta:set_string("infotext", '"' .. fields.text .. '"') + text .. "\" to sign at " .. minetest.pos_to_string(pos)) + local meta = minetest.get_meta(pos) + meta:set_string("text", text) + meta:set_string("infotext", '"' .. text .. '"') end, }) end