Server-side ESP/wallhack protection: hides enemies from a client's packet unless there is a real line of sight.
csb_wallhack_blocker.sma v1.0.0
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/*
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* CSB Wallhack Blocker
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* Copyright (C) 2026 counter-strike-boost.com
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*
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* Server-side wallhack / ESP protection. In FM_AddToFullPack the plugin decides,
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* per viewer, whether an enemy player entity is actually visible: it must be in
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* the viewer's PVS and have a clear line of sight from the viewer's eyes to the
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* target's centre or head. If neither is clear (and the target has not fired
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* recently), the entity is dropped from that client's packet, so it cannot be
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* seen through walls. Teammates and recently-firing enemies are always shown.
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*
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* Inspired by the classic AddToFullPack wall blocker approach (Fysiks /
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* OrangeBox). Independent GPL re-implementation; no original code is reused.
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version. It is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See <https://www.gnu.org/licenses/> for details.
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*/
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#include <amxmodx>
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#include <fakemeta>
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new const PLUGIN[] = "CSB Wallhack Blocker"
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new const VERSION[] = "1.0.0"
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new const AUTHOR[] = "counter-strike-boost.com"
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new g_pEnabled, g_pGrace
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new Float:g_fLastFire[33]
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new g_iMaxPlayers
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public plugin_init()
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{
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register_plugin(PLUGIN, VERSION, AUTHOR)
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g_pEnabled = register_cvar("csb_wh_enabled", "1")
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g_pGrace = register_cvar("csb_wh_firegrace", "1.2")
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register_forward(FM_AddToFullPack, "fwAddToFullPack", 0)
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register_forward(FM_EmitSound, "fwEmitSound", 0)
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g_iMaxPlayers = get_maxplayers()
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}
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public client_putinserver(id)
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{
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g_fLastFire[id] = 0.0
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}
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/* record when a player produces a weapon sound, for the fire grace window */
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public fwEmitSound(ent, channel, const sample[])
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{
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if (ent >= 1 && ent <= g_iMaxPlayers)
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{
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if (sample[0] == 'w' && sample[1] == 'e' && containi(sample, "weapons/") == 0)
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g_fLastFire[ent] = get_gametime()
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}
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return FMRES_IGNORED
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}
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public fwAddToFullPack(es, e, ent, host, hostflags, player, pSet)
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{
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if (!get_pcvar_num(g_pEnabled))
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return FMRES_IGNORED
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/* only care about player entities being packed for a player host */
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if (!player)
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return FMRES_IGNORED
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if (ent < 1 || ent > g_iMaxPlayers || host < 1 || host > g_iMaxPlayers)
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return FMRES_IGNORED
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if (ent == host)
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return FMRES_IGNORED
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if (!is_user_alive(host) || !is_user_alive(ent))
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return FMRES_IGNORED
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/* never hide teammates */
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if (get_user_team(host) == get_user_team(ent))
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return FMRES_IGNORED
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/* recently fired -> position is already given away, keep visible */
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if (get_gametime() - g_fLastFire[ent] < get_pcvar_float(g_pGrace))
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return FMRES_IGNORED
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/* must be inside the host PVS at all */
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if (!engfunc(EngFunc_CheckVisibility, ent, pSet))
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return FMRES_SUPERCEDE
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/* eye position of the viewer */
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static Float:fEye[3], Float:fOfs[3]
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pev(host, pev_origin, fEye)
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pev(host, pev_view_ofs, fOfs)
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fEye[0] += fOfs[0]
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fEye[1] += fOfs[1]
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fEye[2] += fOfs[2]
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/* target centre and head */
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static Float:fTarget[3], Float:fHead[3], Float:fTOfs[3]
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pev(ent, pev_origin, fTarget)
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pev(ent, pev_view_ofs, fTOfs)
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fHead[0] = fTarget[0] + fTOfs[0]
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fHead[1] = fTarget[1] + fTOfs[1]
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fHead[2] = fTarget[2] + fTOfs[2]
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if (clearLine(fEye, fTarget, host) || clearLine(fEye, fHead, host))
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return FMRES_IGNORED
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/* no clear sight line -> drop from this client's packet */
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return FMRES_SUPERCEDE
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}
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bool:clearLine(const Float:start[3], const Float:end[3], ignore)
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{
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engfunc(EngFunc_TraceLine, start, end, IGNORE_MONSTERS, ignore, 0)
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static Float:fFrac
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get_tr2(0, TR_flFraction, fFrac)
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return (fFrac >= 1.0)
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}
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