Ye olde RiotServers.net "anticheat"

 Stupid anticheat from RiotServers.net, written by some dumbass, circa October 2011
 Included is a serverside counterpart "emulator" you can use to see if your shit gets past it
 Have fun and go fuck yourself

 UAC_cl.lua
if SERVER and not CLIENT then return end
require "usermessage"

local GetConVar = GetConVar
local GetConVarNumber = GetConVarNumber
local GetConVarString = GetConVarNumber
local setmetatable = setmetatable
local getmetatable = getmetatable
local RunConsoleCommand = RunConsoleCommand
local AddConsoleCommand = AddConsoleCommand
local engineConsoleCommand = engineConsoleCommand
local rawget = rawget
local rawset = rawset
local type = type
local string = string
local math = math
local timer = require "timer"
local _hook = require "hook"
local _debug = debug
local _util = util
local pcall = pcall
local UAC = {}

local bResponse = false
local bInform = false
local bDebugValid = false
local bMetaValid = false
local protected_struct = {
    "hook",
    "debug"
}
local debug_struct = {
    "getupvalue",
    "sethook",
    "getlocal",
    "setlocal",
    "gethook",
    "getmetatable",
    "setmetatable",
    "traceback",
    "setfenv",
    "getinfo",
    "setupvalue",
    "getregistry",
    "getfenv",
}
local detour_check_struct = {
    ["file"] = {
        "Read",
        "Write",
        "Exists",
        "Find"
    },
    ["debug"] = {
        "getupvalue",
        "sethook",
        "getlocal",
        "setlocal",
        "gethook",
        "getmetatable",
        "setmetatable",
        "traceback",
        "setfenv",
        "getinfo",
        "setupvalue",
        "getregistry",
        "getfenv",
    },

    "GetConVar",
    "GetConVarNumber",
    "GetConVarString",
    "engineConsoleCommand"
}
local cheat_specific_struct = {
    ["FapHack"] = function()
        local s, v = _debug.getupvalue( _G.hook.Add, 2 )
        return s == "FapHack"
    end,
    ["detours"] = function()
        local name, v

        for k, s in pairs( detour_check_struct ) do
            if type( s ) == "table" then
                for _, func in pairs( s ) do
                    if not _G[k] or type( _G[k][func] ) ~= "function" then continue end
                    name, v = _debug.getupvalue( _G[k][func], 1 )

                    if name and v then
                        return true
                    end
                end
            elseif type( s ) == "string" then
                if type( _G[s] ) ~= "function" then continue end
                name, v = _debug.getupvalue( _G[s], 1 )

                if name and v then
                    return true
                end
            end
        end
    end
}


function UAC:Init()
    usermessage.Hook( "uam_u_ping", self.PingResponse )
    usermessage.Hook( "uam_u_resp", self.SupervisorResponse )

    if not ValidEntity or not ValidEntity( LocalPlayer() ) then
        timer.Simple( 1, self.Think )
        return
    end

    if self:CheckDebug() then
        self:InformSupervisor( "debug library not pure", true )
    else
        bDebugValid = true
    end

    timer.Simple( 1, self.Think )
end

function UAC.Think()
    if not ValidEntity or not ValidEntity( LocalPlayer() ) then
        timer.Simple( 1, self.Think )
        return
    end

    timer.Simple( 1, UAC.Think )

    if not UAC.CheckedTables then
        UAC.CheckedTables = true

        if UAC:CheckTables() then
            UAC:InformSupervisor( "protected metatable(s)", true )
        end
    end

    if UAC:CheckDebug() or UAC:CeckDebugUpValues() then
        UAC:InformSupervisor( "debug library not pure", true )
    end

    local chet = UAC:CheckPerCheat()
    if chet then
        UAC:InformSupervisor( chet, true )
    end
end

function UAC:CheckPerCheat()
    for name, func in pairs( cheat_specific_struct ) do
        local b = func()
        if b then return name end
    end
end

function UAC:StringRandom( int )
    local s = ""

    for i = 1, int do
        s = s.. string.char( math.random( 65, 90 ) )
    end

    return s
end

function UAC:CeckDebugUpValues()
    local f = self:StringRandom( math.random( 10, 20 ) )
    local d = self:StringRandom( math.random( 10, 20 ) )
    local t = {}
    local b, v

    t[f] = function(a, b, c)
        return a +b +c
    end

    t[d] = t[f]
    t[f] = function(a, b, c)
        return t[d](a, b, c)
    end

    b, v = debug.getupvalue( t[f], 2 )
    return d ~= v or b ~= "d"
end

function UAC:CheckDebug()
    if type( _G.debug ) ~= "table" then return true end

    for _, s in pairs( debug_struct ) do
        if type( _G.debug[s] ) ~= "function" then
            return true
        end
    end

    return false
end

function UAC:CheckTables()
    local mt = {
        __index = function(...) return self:OnIndex(...) end,
        __newindex = function(...) self:OnNewIndex(...) end,
        __metatable = {}
    }

    local b1, err = pcall( setmetatable, _G, mt )
    return not b1
end

function UAC:FuckOff()
    timer.Simple( 1.5, function()
        local function f()
            for i = 1, 99e99 do
                for i2 = 1, 20 do
                    print( i ^i *(i +(i -i^i2)) )
                end

                if i >= 99e99 then
                    f()
                end
            end
        end

        f()
    end )
end

function UAC:InformSupervisor( strWat, bBan )
    RunConsoleCommand( "__uc_", "svi", strWat, bBan and "_" or false )

    if not bInform then
        bInform = true
        bResponse = false

        timer.Simple( 60, function()
            if not bResponse then
                self:FuckOff()
                return
            end

            bInform = false
        end )
    end
end

function UAC.SupervisorResponse( bf_read )
    bResponse = true
end

function UAC:OnIndex( t, k )
    return rawget( t, k )
end

function UAC:OnNewIndex(t, k, v)
    for _, s in pairs( protected_struct ) do
        if k:find( s ) then
            self:InformSupervisor( "OnNewIndex for pretected var->".. s )
            return
        end
    end

    rawset( t, k, v )
end

function UAC.PingResponse( bf_read )
    RunConsoleCommand( "__uc_", "pong" )
end

UAC:Init()


 UAC_sv.lua
--  UAC server emulator
--  lol noPE

local UAC = {}
UAC.iNextPingTime = -99

--  Ping thing
function UAC.PingThink()
    if UAC.iNextPingTime > CurTime() then return end

    UAC.iNextPingTime = CurTime() + 60

    -- Ping everyone
    umsg.Start( "uam_u_ping" )
    umsg.End()
end
hook.Add( "Think", "uac_ping", UAC.PingThink )

--  Respond to the concommand, yay
function UAC.ConcommandResponse( ply, cmd, args )
    if args[ 1 ] == "pong" then
        MsgN( "[UAC] " .. ply:Name() .. " ponged back." )
    elseif args[ 1 ] == "svi" then
        local reason = args[ 2 ]
        local bIsBan = args[ 3 ]

        MsgN( Format( "[UAC] Player %s is malicious - reason: %s | bIsBan = %s", ply:Name(), reason, tostring( bIsBan ) ) )

        umsg.Start( "uam_u_resp", ply )
        umsg.End()
    end
end
concommand.Add( "__uc_", UAC.ConcommandResponse )