Patch Aim Assist

While this significantly nerfs controller players (I'm sorry), there's been a longstanding exploit that some M&K players were abusing in order to get the same aim assist.
All this plugin does is disable the functionality entirely.

I've placed the plugin in the optional folder, just in case server owners don't want to autoload it in non-competitive modes, but I did place loading of it in generalfixes.cfg so that it'll get loaded by every matchmode.

Author: SirPlease

addons/sourcemod/gamedata/l4d2_block_autoaim.txt

@@ -0,0 +1,27 @@
+"Games"
+{
+	"left4dead2"
+	{
+		"Functions"
+		{
+			"CBasePlayer::ShouldAutoaim"
+			{
+				"signature"		"CBasePlayer::ShouldAutoaim"
+				"callconv"		"thiscall"
+				"return"		"bool"
+				"this"			"entity"
+			}
+		}
+
+		"Signatures"
+		{
+			"CBasePlayer::ShouldAutoaim"
+			{
+				"library"	"server"
+				"linux"		"@_ZN11CBasePlayer13ShouldAutoaimEv"
+				"windows"	"\x56\x8B\xF1\x8B\x06\x8B\x90\x74\x07\x00\x00\xFF\xD2\x84\xC0\x74\x2A\x32\xC0"
+							/* 56 8B F1 8B 06 8B 90 74 07 00 00 FF D2 84 C0 74 ?? 32 C0 */
+			}
+		}
+	}
+}

addons/sourcemod/plugins/optional/l4d2_block_autoaim.smx

@@ -0,0 +1,81 @@
+#pragma semicolon 1
+#pragma newdecls required
+
+#include <sourcemod>
+#include <dhooks>
+
+#define PLUGIN_VERSION "1.0"
+#define GAMEDATA_FILE  "l4d2_block_autoaim"
+#define FUNCTION_NAME  "CBasePlayer::ShouldAutoaim"
+
+public Plugin myinfo =
+{
+	name = "[L4D2] Block Autoaim",
+	author = "Sir",
+	description = "Strips Auto-Aim from the game entirely (disables controller aim-assist + patches an exploit)",
+	version = PLUGIN_VERSION,
+	url = ""
+};
+
+ConVar g_cvEnabled;
+DynamicDetour g_hDetour;
+bool g_bDetourEnabled;
+
+public void OnPluginStart()
+{
+	GameData gd = new GameData(GAMEDATA_FILE);
+	if (!gd) {
+		SetFailState("Missing gamedata \"" ... GAMEDATA_FILE ... ".txt\"");
+	}
+
+	g_hDetour = DynamicDetour.FromConf(gd, FUNCTION_NAME);
+	delete gd;
+
+	if (!g_hDetour) {
+		SetFailState("Failed to set up detour for \"" ... FUNCTION_NAME ... "\"");
+	}
+
+	g_cvEnabled = CreateConVar(
+		"l4d2_block_autoaim",
+		"1",
+		"Disable Auto-Aim",
+		FCVAR_NOTIFY,
+		true, 0.0, true, 1.0
+	);
+	g_cvEnabled.AddChangeHook(OnEnabledChanged);
+
+	ApplyDetourState(g_cvEnabled.BoolValue);
+}
+
+public void OnPluginEnd()
+{
+	ApplyDetourState(false);
+}
+
+void OnEnabledChanged(ConVar convar, const char[] oldValue, const char[] newValue)
+{
+	ApplyDetourState(convar.BoolValue);
+}
+
+void ApplyDetourState(bool enable)
+{
+	if (enable == g_bDetourEnabled) {
+		return;
+	}
+
+	if (enable) {
+		if (!g_hDetour.Enable(Hook_Pre, Detour_ShouldAutoaim)) {
+			SetFailState("Failed to enable detour on \"" ... FUNCTION_NAME ... "\"");
+		}
+		g_bDetourEnabled = true;
+	} else {
+		g_hDetour.Disable(Hook_Pre, Detour_ShouldAutoaim);
+		g_bDetourEnabled = false;
+	}
+}
+
+MRESReturn Detour_ShouldAutoaim(int pPlayer, DHookReturn hReturn)
+{
+	hReturn.Value = 0;
+	return MRES_Supercede;
+}

addons/sourcemod/scripting/l4d2_block_autoaim.sp

@@ -72,4 +72,5 @@ sm plugins load optional/l4d_return_thrown_items.smx
 sm plugins load fixes/l4d_prop_touching_rules.smx
 
 // Anti-Cheat.
+sm plugins load optional/l4d2_block_autoaim.smx // Sort of a cheat..?
 sm plugins load anticheat/l4d2_noghostcheat.smx