[JLmelenchon]

Can someone find a way to fix this **** please ? This exploit exist since a long time apparently, i can find posts about it since 2015.

https://www.reddit.com/r/l4d2/commen...d_out_the_map/

[Marttt]

Never have seen this bug in years, but people are talking about it very often now. In South America this happens mostly on zonemod servers, but seems unrelated (except for the fact that people are more "competitive" on these versus mods)

One way to fix, maybe is to check the origin of the SI if is origin = 0 and if is carrying a survivor, still would need to store the "last position" every sec maybe. Then teleport it back and kill the jockey. (I don't know if it only works for jockey btw)

[JLmelenchon]

Not really a bug from what i understood, it is more a cheat that can be triggered with a program apparently.

[cravenge]

Originally Posted by Marttt Never have seen this bug in years, but people are talking about it very often now. In South America this happens mostly on zonemod servers, but seems unrelated (except for the fact that people are more "competitive" on these versus mods) One way to fix, maybe is to check the origin of the SI if is origin = 0 and if is carrying a survivor, still would need to store the "last position" every sec maybe. Then teleport it back and kill the jockey. (I don't know if it only works for jockey btw)

I stated this problem before but it went unnoticed. For now, I found a temporary solution and that is to disable Jockeys from spawning and double the amount of Hunters to spawn in order to compensate for it.

Simply teleporting the player back to their last origin doesn't stop the high possibility of everyone else crashing once this occurs.

[BHaType]

Airstuck appears if the player in the CreateMove function has set velocity/angles to FLT_MAX;

You can easily track this

PHP Code:

#define IS_NAN(%1) ( (%1) != (%1) )

public Action OnPlayerRunCmd (int client, int &buttons, int &impulse, float vel[3], float angles[3], int& weapon, int &subtype, int &cmdnum, int &tickcount, int &seed)
{
    if ( IsFakeClient(client) )
        return;
    
    if ( IS_NAN(vel[0]) || IS_NAN(angles[0]) ) 
    {
        LogMessage("%N is suspected of using airstuck (NAN value!!)", client);
    }
} 


[JLmelenchon]

Originally Posted by BHaType Airstuck appears if the player in the CreateMove function has set velocity/angles to FLT_MAX; You can easily track this PHP Code: #define IS_NAN(%1) ( (%1) != (%1) ) public Action OnPlayerRunCmd (int client, int &buttons, int &impulse, float vel[3], float angles[3], int& weapon, int &subtype, int &cmdnum, int &tickcount, int &seed) {     if ( IsFakeClient(client) )         return;          if ( IS_NAN(vel[0]) || IS_NAN(angles[0]) )      {         LogMessage("%N is suspected of using airstuck (NAN value!!)", client);     } }

I will try it first, but do you think it will be safe to enable automatic ban ?

[BHaType]

Originally Posted by JLmelenchon I will try it first, but do you think it will be safe to enable automatic ban ?

I do not know how player can break his angles/velocity without using cheats or console but I am not sure that such methods do not exist so decide for yourself

[JLmelenchon]

Added log to file.

#include <sourcemod>
#include <sdkhooks>
#include <sdktools>

#pragma newdecls required

#define IS_NAN(%1) ( (%1) != (%1) )

char path[256];

public Plugin myinfo = 
{
	name = "Airstuck detection",
	author = "BHaType",
	description = "Detect cheaters who use airstuck exploit.",
	version = "1.0",
	url = "https://forums.alliedmods.net/showpost.php?p=2726146&postcount=5"
};

public void OnPluginStart()
{
	BuildPath(Path_SM, path, 256, "logs/airstuck.txt");
	
	HookEvent("player_connect_full", Event_PlayerConnect);
}

public void Event_PlayerConnect(Event event, const char[] name, bool dontBroadcast)
{
	int client = GetClientOfUserId(event.GetInt("userid"));

	if (client == 0 || !IsClientInGame(client) || IsFakeClient(client)) return;
}

public Action OnPlayerRunCmd (int client, int &buttons, int &impulse, float vel[3], float angles[3], int& weapon, int &subtype, int &cmdnum, int &tickcount, int &seed)
{
    if ( IsFakeClient(client) )
        return;
    
    if ( IS_NAN(vel[0]) || IS_NAN(angles[0]) ) 
    {
        char SteamID[32];
        GetClientAuthId(client, AuthId_Steam2, SteamID, sizeof(SteamID));
        
        LogToFile(path, ".:[Name: %N | STEAMID: %s  is suspected of using airstuck cheat.]:.", client, SteamID);
        LogMessage("%N is suspected of using airstuck (NAN value!!)", client);
    }
}

[JLmelenchon]

Well i doubt that this is working, it just happened in one of my games and it detected nothing.

[cravenge]

If anyone can provide me a screenshot of what the cheat's interface looks like, I might be able to whip something up to detect the other features it offers. I already have an experimental detection against spawning in plain sight in impossible cases and it seems to be working fine so far.