anticheat.qh File Reference

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Functions
void	anticheat_endframe ()
void	anticheat_fixangle (entity this)
void	anticheat_init (entity this)
void	anticheat_physics (entity this)
void	anticheat_prethink (entity this)
void	anticheat_register_to_playerstats ()
void	anticheat_report_to_eventlog (entity this)
void	anticheat_report_to_playerstats (entity this)
void	anticheat_spectatecopy (entity this, entity spectatee)
void	anticheat_startframe ()

Function Documentation

anticheat_endframe()

void anticheat_endframe

(

)

Definition at line 234 of file anticheat.qc.

References anticheat_div0_evade_evasion_delta, anticheat_fixangle(), FOREACH_CLIENT, frametime, and random().

Referenced by EndFrame().

{
    FOREACH_CLIENT(it.fixangle, anticheat_fixangle(it));
    anticheat_div0_evade_evasion_delta += frametime * (0.5 + random());
}

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anticheat_fixangle()

void anticheat_fixangle

(

entity

this

)

Definition at line 229 of file anticheat.qc.

References ANTILAG_LATENCY, CS(), and servertime.

Referenced by anticheat_endframe(), and WarpZone_PostTeleportPlayer_Callback().

{
    CS(this).anticheat_fixangle_endtime = servertime + ANTILAG_LATENCY(this) + 0.2;
}

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anticheat_init()

void anticheat_init

(

entity

this

)

Definition at line 240 of file anticheat.qc.

References CS(), and servertime.

{
    CS(this).anticheat_speedhack_offset = 0;
    CS(this).anticheat_jointime = servertime;
}

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anticheat_physics()

void anticheat_physics

(

entity

this

)

Definition at line 64 of file anticheat.qc.

References anticheat_div0_evade_evasion_delta, anticheat_div0_evade_forward_initial, anticheat_div0_evade_offset, anticheat_div0_strafebot_forward_prev, anticheat_div0_strafebot_movement_prev, anticheat_fixangle_endtime, anticheat_speedhack_accu, anticheat_speedhack_movetime_frac, anticheat_speedhack_offset, autocvar_slowmo, CS(), exp(), fabs(), falloff, floor(), frametime, M_PI, makevectors, max(), MEAN_ACCUMULATE, movement, movement_oddity(), servertime, sys_frametime, time, v_angle, and v_forward.

Referenced by sys_phys_monitor().

{
    float f;

    // div0_evade -> SPECTATORS
    makevectors(this.v_angle);
    if(CS(this).anticheat_div0_evade_offset == 0)
    {
        f = fabs(anticheat_div0_evade_evasion_delta - floor(anticheat_div0_evade_evasion_delta) - 0.5) * 2; // triangle function
        CS(this).anticheat_div0_evade_offset = servertime + sys_frametime * (3 * f - 1);
        CS(this).anticheat_div0_evade_v_angle = this.v_angle;
        CS(this).anticheat_div0_evade_forward_initial = v_forward;
        MEAN_ACCUMULATE(CS(this), anticheat_div0_evade, 0, 1);
    }
    else
    {
        if(time < CS(this).anticheat_div0_evade_offset)
            CS(this).anticheat_div0_evade_v_angle = this.v_angle;
        MEAN_ACCUMULATE(CS(this), anticheat_div0_evade, 0.5 - 0.5 * (CS(this).anticheat_div0_evade_forward_initial * v_forward), 1);
    }

    MEAN_ACCUMULATE(CS(this), anticheat_div0_strafebot_old, movement_oddity(CS(this).movement, CS(this).anticheat_div0_strafebot_movement_prev), 1);
    CS(this).anticheat_div0_strafebot_movement_prev = CS(this).movement;

    // Note: this actually tries to detect snap-aim.
    if(CS(this).anticheat_div0_strafebot_forward_prev && time > CS(this).anticheat_fixangle_endtime) {
        float cosangle = CS(this).anticheat_div0_strafebot_forward_prev * v_forward;
        float angle = cosangle < -1 ? M_PI : cosangle > 1 ? 0 : acos(cosangle);
        /*
        if (angle >= 10 * M_PI / 180)
            printf("SNAP %s: %f for %f, %f since fixangle\n", this.netname, angle * 180 / M_PI, cosangle, time - CS(this).anticheat_fixangle_endtime);
        */
        MEAN_ACCUMULATE(CS(this), anticheat_div0_strafebot_new, angle / M_PI, 1);

        if (autocvar_slowmo > 0) {
            // Technically this is a NOP, as the engine should be ensuring
            // this in the first place. Let's guard against dividing by
            // zero anyway.
            float dt = max(0.001, frametime) / autocvar_slowmo;

            float anglespeed = angle / dt;
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_signal, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_noise, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_m2, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_m3, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_m4, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_m7, anglespeed, dt);
            MEAN_ACCUMULATE(CS(this), anticheat_idle_snapaim_m10, anglespeed, dt);
        }
    }
    CS(this).anticheat_div0_strafebot_forward_prev = v_forward;

    // generic speedhack detection: correlate anticheat_speedhack_movetime (UPDATED BEFORE THIS) and server time
    CS(this).anticheat_speedhack_movetime_frac += frametime;
    f = floor(CS(this).anticheat_speedhack_movetime_frac);
    CS(this).anticheat_speedhack_movetime_frac -= f;
    CS(this).anticheat_speedhack_movetime_count += f;
    CS(this).anticheat_speedhack_movetime = CS(this).anticheat_speedhack_movetime_frac + CS(this).anticheat_speedhack_movetime_count;
    f = CS(this).anticheat_speedhack_movetime - servertime;
    if(CS(this).anticheat_speedhack_offset == 0)
        CS(this).anticheat_speedhack_offset = f;
    else
    {
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack, max(0, f - CS(this).anticheat_speedhack_offset), 1);
        CS(this).anticheat_speedhack_offset += (f - CS(this).anticheat_speedhack_offset) * frametime * 0.1;
    }

    // new generic speedhack detection
    if (CS(this).anticheat_speedhack_lasttime > 0) {
        float dt = servertime - CS(this).anticheat_speedhack_lasttime;
        const float falloff = 0.2;
        CS(this).anticheat_speedhack_accu *= exp(-dt * falloff);
        CS(this).anticheat_speedhack_accu += frametime * falloff;
        // NOTE: at cl_netfps x, this actually averages not to 1, but to 1/x * falloff / (1 - exp(-1/x * falloff))
        // For 15 netfps (absolute minimum bearable), and 0.2 falloff, this is: 1.0067
        CS(this).anticheat_speedhack_lasttime = servertime;
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack_m1, CS(this).anticheat_speedhack_accu, frametime);
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack_m2, CS(this).anticheat_speedhack_accu, frametime);
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack_m3, CS(this).anticheat_speedhack_accu, frametime);
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack_m4, CS(this).anticheat_speedhack_accu, frametime);
        MEAN_ACCUMULATE(CS(this), anticheat_speedhack_m5, CS(this).anticheat_speedhack_accu, frametime);
    } else {
        CS(this).anticheat_speedhack_accu = 1;
        CS(this).anticheat_speedhack_lasttime = servertime;
    }
}

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anticheat_prethink()

void anticheat_prethink

(

entity

this

)

Definition at line 157 of file anticheat.qc.

References CS().

Referenced by PlayerPreThink().

{
    // div0_evade -> SPECTATORS
    CS(this).anticheat_div0_evade_offset = 0;
}

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anticheat_register_to_playerstats()

void anticheat_register_to_playerstats

(

)

Definition at line 214 of file anticheat.qc.

References ANTICHEAT_REGISTER_ONE, ANTICHEATS, and strcat().

                                         {
    PlayerStats_GameReport_AddEvent(strcat(PLAYERSTATS_ANTICHEAT, "_time"));
#define ANTICHEAT_REGISTER_ONE(name, unused_f, unused_tmin, unused_mi, unused_ma) \
    PlayerStats_GameReport_AddEvent(strcat(PLAYERSTATS_ANTICHEAT, name))
    ANTICHEATS(ANTICHEAT_REGISTER_ONE);
#undef ANTICHEAT_REGISTER_ONE
}

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anticheat_report_to_eventlog()

void anticheat_report_to_eventlog

(

entity

this

)

Definition at line 195 of file anticheat.qc.

References anticheat_jointime, ANTICHEAT_REPORT_ONE, ANTICHEATS, autocvar_sv_eventlog, CS(), ftos(), GameLogEcho(), playerid, servertime, and strcat().

                                               {
    if(!autocvar_sv_eventlog)
        return;
    GameLogEcho(strcat(":anticheat:_time:", ftos(this.playerid), ":", ftos(servertime - CS(this).anticheat_jointime)));
#define ANTICHEAT_REPORT_ONE(name, f, tmin, mi, ma) \
    GameLogEcho(strcat(":anticheat:", name, ":", anticheat_display(f, servertime - CS(this).anticheat_jointime, tmin, mi, ma)))
    ANTICHEATS(ANTICHEAT_REPORT_ONE);
#undef ANTICHEAT_REPORT_ONE
}

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anticheat_report_to_playerstats()

void anticheat_report_to_playerstats

(

entity

this

)

Definition at line 205 of file anticheat.qc.

References anticheat_jointime, ANTICHEAT_REPORT_ONE, ANTICHEATS, CS(), servertime, and strcat().

                                                  {
    PlayerStats_GameReport_Event_Player(this,
        strcat(PLAYERSTATS_ANTICHEAT, "_time"), servertime - CS(this).anticheat_jointime);
#define ANTICHEAT_REPORT_ONE(name, f, tmin, mi, ma) \
    PlayerStats_GameReport_Event_Player(this, strcat(PLAYERSTATS_ANTICHEAT, name), f)
    ANTICHEATS(ANTICHEAT_REPORT_ONE);
#undef ANTICHEAT_REPORT_ONE
}

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anticheat_spectatecopy()

void anticheat_spectatecopy	(	entity	this,
		entity	spectatee
	)

Definition at line 151 of file anticheat.qc.

References angles, and CS().

Referenced by SpectateCopy().

{
    // div0_evade -> SPECTATORS
    this.angles = CS(spectatee).anticheat_div0_evade_v_angle;
}

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anticheat_startframe()

void anticheat_startframe

(

)

Definition at line 224 of file anticheat.qc.

References anticheat_div0_evade_evasion_delta, frametime, and random().

Referenced by StartFrame().

{
    anticheat_div0_evade_evasion_delta += frametime * (0.5 + random());
}

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