antigarry - idea by leystryku

cl_antigarry.lua

hook.Add("FakeIDDetect", "FakeIDDetectExample", function(ply)
    chat.AddText(Color(255,0,0,255), ply:Nick().." has a fake id. Do not let him fool you. If you are an admin please ban him.");
end);

steamids = steamids or {};

local Old = FindMetaTable"Player".SteamID64;

net.Receive("weapon_smg1", function(len, cl)
    local ent = net.ReadEntity();
    steamids[ent] = net.ReadString();

    print(Old(ent), steamids[ent]);

    if (steamids[ent] ~= Old(ent)) then
        hook.Run("FakeIDDetect", ent);
    end

end);

FindMetaTable"Player".SteamID64 = function(self)
    return steamids[self] or "0";
end

FindMetaTable"Player".SteamID = function(self)
    return util.SteamIDFrom64(steamids[self]);
end

sv_antigarry.lua

local function SendSteamID(target)

    timer.Simple(1, function()
        net.Start"weapon_smg1"
            net.WriteEntity(target);
            net.WriteString(target:SteamID64());
        net.Broadcast();

        for k,v in pairs(player.GetAll()) do

            net.Start"weapon_smg1"
                net.WriteEntity(v);
                net.WriteString(v:SteamID64());
            net.Send(target);

        end
    end);

end

hook.Add("PlayerInitialSpawn", "AntiGarry", SendSteamID);