1 .float anticheat_jointime;
3 void mean_accumulate(entity e, .float a, .float c, float mean, float value, float weight)
8 e.a *= pow(value, weight);
10 e.a += pow(value, mean) * weight;
14 float mean_evaluate(entity e, .float a, .float c, float mean)
19 return pow(e.a, 1.0 / e.c);
21 return pow(e.a / e.c, 1.0 / mean);
24 #define MEAN_ACCUMULATE(prefix,v,w) mean_accumulate(self,prefix##_accumulator,prefix##_count,prefix##_mean,v,w)
25 #define MEAN_EVALUATE(prefix) mean_evaluate(self,prefix##_accumulator,prefix##_count,prefix##_mean)
26 #define MEAN_DECLARE(prefix,m) float prefix##_mean = m; .float prefix##_count, prefix##_accumulator
28 .float anticheat_fixangle_endtime;
30 float anticheat_div0_evade_evasion_delta;
31 .float anticheat_div0_evade_offset;
32 .vector anticheat_div0_evade_v_angle;
33 .vector anticheat_div0_evade_forward_initial;
34 MEAN_DECLARE(anticheat_div0_evade, 5);
36 .vector anticheat_div0_strafebot_movement_prev;
37 MEAN_DECLARE(anticheat_div0_strafebot_old, 5);
39 .vector anticheat_div0_strafebot_forward_prev;
40 MEAN_DECLARE(anticheat_div0_strafebot_new, 5);
42 // Snap-aim detection: we track the average angular speed of aiming over time, in "radians per second".
43 // Signal: a high-power mean. Cheaters will have high "signal" here.
44 // Noise: a low-power mean. Active/shivery players will have high "noise" here.
45 // Note one can always artificially add noise - so very high values of both signal and noise need to be checked too.
46 MEAN_DECLARE(anticheat_idle_snapaim_signal, 5);
47 MEAN_DECLARE(anticheat_idle_snapaim_noise, 1);
50 MEAN_DECLARE(anticheat_idle_snapaim_m2, 2);
51 MEAN_DECLARE(anticheat_idle_snapaim_m3, 3);
52 MEAN_DECLARE(anticheat_idle_snapaim_m4, 4);
53 MEAN_DECLARE(anticheat_idle_snapaim_m7, 7);
54 MEAN_DECLARE(anticheat_idle_snapaim_m10, 10);
56 .float anticheat_speedhack_offset;
57 .float anticheat_speedhack_movetime, anticheat_speedhack_movetime_count, anticheat_speedhack_movetime_frac;
58 MEAN_DECLARE(anticheat_speedhack, 5);
60 .float anticheat_speedhack_accu;
61 .float anticheat_speedhack_lasttime;
62 MEAN_DECLARE(anticheat_speedhack_m1, 1);
63 MEAN_DECLARE(anticheat_speedhack_m2, 2);
64 MEAN_DECLARE(anticheat_speedhack_m3, 3);
65 MEAN_DECLARE(anticheat_speedhack_m4, 4);
66 MEAN_DECLARE(anticheat_speedhack_m5, 5);
68 float movement_oddity(vector m0, vector m1)
70 float cosangle = normalize(m0) * normalize(m1);
73 return 0.5 - 0.5 * cos(cosangle * cosangle * 4 * M_PI);
74 // returns 0 for: -1, -sqrt(0.5), 0 (angles that commonly happen with kbd)
77 void anticheat_physics()
82 // div0_evade -> SPECTATORS
83 makevectors(self.v_angle);
84 if(self.anticheat_div0_evade_offset == 0)
86 f = fabs(anticheat_div0_evade_evasion_delta - floor(anticheat_div0_evade_evasion_delta) - 0.5) * 2; // triangle function
87 self.anticheat_div0_evade_offset = servertime + sys_frametime * (3 * f - 1);
88 self.anticheat_div0_evade_v_angle = self.v_angle;
89 self.anticheat_div0_evade_forward_initial = v_forward;
90 MEAN_ACCUMULATE(anticheat_div0_evade, 0, 1);
94 if(time < self.anticheat_div0_evade_offset)
95 self.anticheat_div0_evade_v_angle = self.v_angle;
96 MEAN_ACCUMULATE(anticheat_div0_evade, 0.5 - 0.5 * (self.anticheat_div0_evade_forward_initial * v_forward), 1);
99 MEAN_ACCUMULATE(anticheat_div0_strafebot_old, movement_oddity(self.movement, self.anticheat_div0_strafebot_movement_prev), 1);
100 self.anticheat_div0_strafebot_movement_prev = self.movement;
102 // Note: this actually tries to detect snap-aim.
103 if(vlen(self.anticheat_div0_strafebot_forward_prev) && time > self.anticheat_fixangle_endtime) {
104 float cosangle = self.anticheat_div0_strafebot_forward_prev * v_forward;
105 float angle = cosangle < -1 ? M_PI : cosangle > 1 ? 0 : acos(cosangle);
107 if (angle >= 10 * M_PI / 180)
108 printf("SNAP %s: %f for %f, %f since fixangle\n", self.netname, angle * 180 / M_PI, cosangle, time - self.anticheat_fixangle_endtime);
110 MEAN_ACCUMULATE(anticheat_div0_strafebot_new, angle / M_PI, 1);
112 if (autocvar_slowmo > 0) {
113 // Technically this is a NOP, as the engine should be ensuring
114 // this in the first place. Let's guard against dividing by
116 float dt = max(0.001, frametime) / autocvar_slowmo;
118 float anglespeed = angle / dt;
119 MEAN_ACCUMULATE(anticheat_idle_snapaim_signal, anglespeed, dt);
120 MEAN_ACCUMULATE(anticheat_idle_snapaim_noise, anglespeed, dt);
121 MEAN_ACCUMULATE(anticheat_idle_snapaim_m2, anglespeed, dt);
122 MEAN_ACCUMULATE(anticheat_idle_snapaim_m3, anglespeed, dt);
123 MEAN_ACCUMULATE(anticheat_idle_snapaim_m4, anglespeed, dt);
124 MEAN_ACCUMULATE(anticheat_idle_snapaim_m7, anglespeed, dt);
125 MEAN_ACCUMULATE(anticheat_idle_snapaim_m10, anglespeed, dt);
128 self.anticheat_div0_strafebot_forward_prev = v_forward;
130 // generic speedhack detection: correlate anticheat_speedhack_movetime (UPDATED BEFORE THIS) and server time
131 self.anticheat_speedhack_movetime_frac += frametime;
132 f = floor(self.anticheat_speedhack_movetime_frac);
133 self.anticheat_speedhack_movetime_frac -= f;
134 self.anticheat_speedhack_movetime_count += f;
135 self.anticheat_speedhack_movetime = self.anticheat_speedhack_movetime_frac + self.anticheat_speedhack_movetime_count;
136 f = self.anticheat_speedhack_movetime - servertime;
137 if(self.anticheat_speedhack_offset == 0)
138 self.anticheat_speedhack_offset = f;
141 MEAN_ACCUMULATE(anticheat_speedhack, max(0, f - self.anticheat_speedhack_offset), 1);
142 self.anticheat_speedhack_offset += (f - self.anticheat_speedhack_offset) * frametime * 0.1;
145 // new generic speedhack detection
146 if (self.anticheat_speedhack_lasttime > 0) {
147 float dt = servertime - self.anticheat_speedhack_lasttime;
148 const float falloff = 0.2;
149 self.anticheat_speedhack_accu *= exp(-dt * falloff);
150 self.anticheat_speedhack_accu += frametime * falloff;
151 // NOTE: at cl_netfps x, this actually averages not to 1, but to 1/x * falloff / (1 - exp(-1/x * falloff))
152 // For 15 netfps (absolute minimum bearable), and 0.2 falloff, this is: 1.0067
153 self.anticheat_speedhack_lasttime = servertime;
154 MEAN_ACCUMULATE(anticheat_speedhack_m1, self.anticheat_speedhack_accu, frametime);
155 MEAN_ACCUMULATE(anticheat_speedhack_m2, self.anticheat_speedhack_accu, frametime);
156 MEAN_ACCUMULATE(anticheat_speedhack_m3, self.anticheat_speedhack_accu, frametime);
157 MEAN_ACCUMULATE(anticheat_speedhack_m4, self.anticheat_speedhack_accu, frametime);
158 MEAN_ACCUMULATE(anticheat_speedhack_m5, self.anticheat_speedhack_accu, frametime);
160 self.anticheat_speedhack_accu = 1;
161 self.anticheat_speedhack_lasttime = servertime;
164 // race/CTS: force kbd movement for fairness
167 // if record times matter
168 // ensure nothing EVIL is being done (i.e. div0_evade)
169 // this hinders joystick users though
170 // but it still gives SOME analog control
171 wishvel_x = fabs(self.movement_x);
172 wishvel_y = fabs(self.movement_y);
173 if(wishvel_x != 0 && wishvel_y != 0 && wishvel_x != wishvel_y)
176 wishspeed = vlen(wishvel);
177 if(wishvel_x >= 2 * wishvel_y)
180 if(self.movement_x > 0)
181 self.movement_x = wishspeed;
183 self.movement_x = -wishspeed;
186 else if(wishvel_y >= 2 * wishvel_x)
190 if(self.movement_y > 0)
191 self.movement_y = wishspeed;
193 self.movement_y = -wishspeed;
198 if(self.movement_x > 0)
199 self.movement_x = M_SQRT1_2 * wishspeed;
201 self.movement_x = -M_SQRT1_2 * wishspeed;
202 if(self.movement_y > 0)
203 self.movement_y = M_SQRT1_2 * wishspeed;
205 self.movement_y = -M_SQRT1_2 * wishspeed;
211 void anticheat_spectatecopy(entity spectatee)
213 // div0_evade -> SPECTATORS
214 self.angles = spectatee.anticheat_div0_evade_v_angle;
217 void anticheat_prethink()
219 // div0_evade -> SPECTATORS
220 self.anticheat_div0_evade_offset = 0;
223 string anticheat_display(float f, float tmin, float mi, float ma)
228 return strcat(s, ":N");
230 return strcat(s, ":Y");
231 return strcat(s, ":-");
234 void anticheat_report()
236 if(!autocvar_sv_eventlog)
238 // TODO(divVerent): Use xonstat to acquire good thresholds.
239 GameLogEcho(strcat(":anticheat:_time:", ftos(self.playerid), ":", ftos(servertime - self.anticheat_jointime)));
240 GameLogEcho(strcat(":anticheat:speedhack:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack), 240, 0, 9999))); // Actually this one seems broken.
241 GameLogEcho(strcat(":anticheat:speedhack_m1:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack_m1), 240, 1.01, 1.25)));
242 GameLogEcho(strcat(":anticheat:speedhack_m2:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack_m2), 240, 1.01, 1.25)));
243 GameLogEcho(strcat(":anticheat:speedhack_m3:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack_m3), 240, 1.01, 1.25)));
244 GameLogEcho(strcat(":anticheat:speedhack_m4:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack_m4), 240, 1.01, 1.25)));
245 GameLogEcho(strcat(":anticheat:speedhack_m5:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_speedhack_m5), 240, 1.01, 1.25)));
246 GameLogEcho(strcat(":anticheat:div0_strafebot_old:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_div0_strafebot_old), 120, 0.15, 0.4)));
247 GameLogEcho(strcat(":anticheat:div0_strafebot_new:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_div0_strafebot_new), 120, 0.25, 0.8)));
248 GameLogEcho(strcat(":anticheat:div0_evade:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_div0_evade), 120, 0.2, 0.5)));
249 GameLogEcho(strcat(":anticheat:idle_snapaim:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_signal) - MEAN_EVALUATE(anticheat_idle_snapaim_noise), 120, 0, 9999)));
250 GameLogEcho(strcat(":anticheat:idle_snapaim_signal:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_signal), 120, 0, 9999)));
251 GameLogEcho(strcat(":anticheat:idle_snapaim_noise:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_noise), 120, 0, 9999)));
252 GameLogEcho(strcat(":anticheat:idle_snapaim_m2:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_m2), 120, 0, 9999)));
253 GameLogEcho(strcat(":anticheat:idle_snapaim_m3:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_m3), 120, 0, 9999)));
254 GameLogEcho(strcat(":anticheat:idle_snapaim_m4:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_m4), 120, 0, 9999)));
255 GameLogEcho(strcat(":anticheat:idle_snapaim_m7:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_m7), 120, 0, 9999)));
256 GameLogEcho(strcat(":anticheat:idle_snapaim_m10:", ftos(self.playerid), ":", anticheat_display(MEAN_EVALUATE(anticheat_idle_snapaim_m10), 120, 0, 9999)));
259 float anticheat_getvalue(string id)
262 case "_time": return servertime - self.anticheat_jointime;
263 case "speedhack": return MEAN_EVALUATE(anticheat_speedhack);
264 case "speedhack_m1": return MEAN_EVALUATE(anticheat_speedhack_m1);
265 case "speedhack_m2": return MEAN_EVALUATE(anticheat_speedhack_m2);
266 case "speedhack_m3": return MEAN_EVALUATE(anticheat_speedhack_m3);
267 case "speedhack_m4": return MEAN_EVALUATE(anticheat_speedhack_m4);
268 case "speedhack_m5": return MEAN_EVALUATE(anticheat_speedhack_m5);
269 case "div0_strafebot_old": return MEAN_EVALUATE(anticheat_div0_strafebot_old);
270 case "div0_strafebot_new": return MEAN_EVALUATE(anticheat_div0_strafebot_new);
271 case "div0_evade": return MEAN_EVALUATE(anticheat_div0_evade);
272 case "idle_snapaim": return MEAN_EVALUATE(anticheat_idle_snapaim_signal) - MEAN_EVALUATE(anticheat_idle_snapaim_noise);
273 case "idle_snapaim_signal": return MEAN_EVALUATE(anticheat_idle_snapaim_signal);
274 case "idle_snapaim_noise": return MEAN_EVALUATE(anticheat_idle_snapaim_noise);
275 case "idle_snapaim_m2": return MEAN_EVALUATE(anticheat_idle_snapaim_m2);
276 case "idle_snapaim_m3": return MEAN_EVALUATE(anticheat_idle_snapaim_m3);
277 case "idle_snapaim_m4": return MEAN_EVALUATE(anticheat_idle_snapaim_m4);
278 case "idle_snapaim_m7": return MEAN_EVALUATE(anticheat_idle_snapaim_m7);
279 case "idle_snapaim_m10": return MEAN_EVALUATE(anticheat_idle_snapaim_m10);
284 void anticheat_startframe()
286 anticheat_div0_evade_evasion_delta += frametime * (0.5 + random());
289 void anticheat_fixangle()
291 self.anticheat_fixangle_endtime = servertime + ANTILAG_LATENCY(self) + 0.2;
294 void anticheat_endframe()
296 entity oldself = self;
297 FOR_EACH_CLIENT(self)
299 anticheat_fixangle();
301 anticheat_div0_evade_evasion_delta += frametime * (0.5 + random());
304 void anticheat_init()
306 self.anticheat_speedhack_offset = 0;
307 self.anticheat_jointime = servertime;
310 void anticheat_shutdown()