/
libcod.cpp
1520 lines (1206 loc) · 39.7 KB
/
libcod.cpp
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#include "gsc.hpp"
/* ... ... ... */
cvar_t *sv_maxclients;
cvar_t *sv_allowDownload;
cvar_t *sv_pure;
cvar_t *developer;
cvar_t *rcon_password;
cvar_t *con_coloredPrints;
cvar_t *cl_allowDownload;
cvar_t *sv_timeout;
cvar_t *sv_zombietime;
#if COD_VERSION == COD2_1_2 || COD_VERSION == COD2_1_3
cvar_t *sv_wwwDownload;
cvar_t *cl_wwwDownload;
#endif
cvar_t *sv_cracked;
cvar_t *sv_noauthorize;
cvar_t *g_playerCollision;
cvar_t *g_playerEject;
cvar_t *sv_allowRcon;
cvar_t *fs_library;
cvar_t *sv_downloadMessage;
cvar_t *fs_callbacks;
cHook *hook_gametype_scripts;
cHook *hook_player_collision;
cHook *hook_player_eject;
cHook *hook_fire_grenade;
cHook *hook_play_movement;
cHook *hook_play_endframe;
cHook *hook_set_anim;
cHook *hook_init_opcode;
cHook *hook_add_opcode;
cHook *hook_print_codepos;
cHook *hook_touch_item;
cHook *hook_outband;
int codecallback_svc_info = 0;
int codecallback_remotecommand = 0;
int codecallback_playercommand = 0;
int codecallback_userinfochanged = 0;
int codecallback_fire_grenade = 0;
int codecallback_vid_restart = 0;
int codecallback_client_spam = 0;
int codecallback_meleebutton = 0;
int codecallback_usebutton = 0;
int codecallback_attackbutton = 0;
/* ... ... ... */
void hook_sv_init(const char *format, ...)
{
char s[COD2_MAX_STRINGLENGTH];
va_list va;
va_start(va, format);
vsnprintf(s, sizeof(s), format, va);
va_end(va);
Com_Printf("%s", s);
/* Do stuff after sv has been initialized here */
// Register custom cvars
sv_cracked = Cvar_RegisterBool("sv_cracked", qfalse, CVAR_ARCHIVE);
sv_noauthorize = Cvar_RegisterBool("sv_noauthorize", qfalse, CVAR_ARCHIVE);
con_coloredPrints = Cvar_RegisterBool("con_coloredPrints", qtrue, CVAR_ARCHIVE);
g_playerCollision = Cvar_RegisterBool("g_playerCollision", qtrue, CVAR_ARCHIVE);
g_playerEject = Cvar_RegisterBool("g_playerEject", qtrue, CVAR_ARCHIVE);
sv_allowRcon = Cvar_RegisterBool("sv_allowRcon", qtrue, CVAR_ARCHIVE);
fs_library = Cvar_RegisterString("fs_library", "", CVAR_ARCHIVE);
sv_downloadMessage = Cvar_RegisterString("sv_downloadMessage", "", CVAR_ARCHIVE);
fs_callbacks = Cvar_RegisterString("fs_callbacks", "", CVAR_ARCHIVE);
// Force download on clients
cl_allowDownload = Cvar_RegisterBool("cl_allowDownload", qtrue, CVAR_ARCHIVE | CVAR_SYSTEMINFO);
#if COD_VERSION == COD2_1_2 || COD_VERSION == COD2_1_3
cl_wwwDownload = Cvar_RegisterBool("cl_wwwDownload", qtrue, CVAR_ARCHIVE | CVAR_SYSTEMINFO);
#endif
sv_maxclients = Cvar_FindVar("sv_maxclients");
sv_allowDownload = Cvar_FindVar("sv_allowDownload");
sv_pure = Cvar_FindVar("sv_pure");
developer = Cvar_FindVar("developer");
rcon_password = Cvar_FindVar("rcon_password");
sv_timeout = Cvar_FindVar("sv_timeout");
sv_zombietime = Cvar_FindVar("sv_zombietime");
#if COD_VERSION == COD2_1_2 || COD_VERSION == COD2_1_3
sv_wwwDownload = Cvar_FindVar("sv_wwwDownload");
#endif
}
void hook_sv_spawnserver(const char *format, ...)
{
char s[COD2_MAX_STRINGLENGTH];
va_list va;
va_start(va, format);
vsnprintf(s, sizeof(s), format, va);
va_end(va);
Com_Printf("%s", s);
/* Do stuff after sv has been spawned here */
}
int hook_codscript_gametype_scripts()
{
char path_for_cb[512] = "maps/mp/gametypes/_callbacksetup";
if (strlen(fs_callbacks->string))
strncpy(path_for_cb, fs_callbacks->string, sizeof(path_for_cb));
hook_gametype_scripts->unhook();
codecallback_svc_info = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_SVC_Info", 0);
codecallback_remotecommand = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_remoteCommand", 0);
codecallback_playercommand = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_PlayerCommand", 0);
codecallback_userinfochanged = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_UserInfoChanged", 0);
codecallback_fire_grenade = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_FireGrenade", 0);
codecallback_vid_restart = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_VidRestart", 0);
codecallback_client_spam = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_CLSpam", 0);
codecallback_meleebutton = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_MeleeButton", 0);
codecallback_usebutton = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_UseButton", 0);
codecallback_attackbutton = Scr_GetFunctionHandle(path_for_cb, "CodeCallback_AttackButton", 0);
int (*sig)();
*(int *)&sig = hook_gametype_scripts->from;
int ret = sig();
hook_gametype_scripts->hook();
return ret;
}
int player_collision(int a1)
{
hook_player_collision->unhook();
int (*sig)(int a1);
*(int *)&sig = hook_player_collision->from;
int ret;
if (g_playerCollision->boolean)
ret = sig(a1);
else
ret = 0;
hook_player_collision->hook();
return ret;
}
int player_eject(int a1)
{
hook_player_eject->unhook();
int (*sig)(int a1);
*(int *)&sig = hook_player_eject->from;
int ret;
if (g_playerEject->boolean)
ret = sig(a1);
else
ret = 0;
hook_player_eject->hook();
return ret;
}
gentity_t* fire_grenade(gentity_t *self, vec3_t start, vec3_t dir, int weapon, int time)
{
hook_fire_grenade->unhook();
gentity_t* (*sig)(gentity_t *self, vec3_t start, vec3_t dir, int weapon, int time);
*(int *)&sig = hook_fire_grenade->from;
gentity_t* grenade = sig(self, start, dir, weapon, time);
hook_fire_grenade->hook();
if (codecallback_fire_grenade)
{
WeaponDef_t *def = BG_WeaponDefs(weapon);
stackPushString(def->szInternalName);
stackPushEntity(grenade);
short ret = Scr_ExecEntThread(self, codecallback_fire_grenade, 2);
Scr_FreeThread(ret);
}
return grenade;
}
void hook_ClientCommand(int clientNum)
{
if (!Scr_IsSystemActive())
return;
if ( ! codecallback_playercommand)
{
ClientCommand(clientNum);
return;
}
stackPushArray();
int args = Cmd_Argc();
for (int i = 0; i < args; i++)
{
char tmp[COD2_MAX_STRINGLENGTH];
SV_Cmd_ArgvBuffer(i, tmp, sizeof(tmp));
if(i == 1 && tmp[0] >= 20 && tmp[0] <= 22)
{
char *part = strtok(tmp + 1, " ");
while(part != NULL)
{
stackPushString(part);
stackPushArrayLast();
part = strtok(NULL, " ");
}
}
else
{
stackPushString(tmp);
stackPushArrayLast();
}
}
short ret = Scr_ExecEntThread(&g_entities[clientNum], codecallback_playercommand, 1);
Scr_FreeThread(ret);
}
int hook_isLanAddress(netadr_t adr)
{
if (sv_noauthorize->boolean)
return 1;
return Sys_IsLANAddress(adr);
}
const char* hook_AuthorizeState(int arg)
{
const char *s = Cmd_Argv(arg);
if (sv_cracked->boolean && strcmp(s, "deny") == 0)
return "accept";
return s;
}
void hook_ClientUserinfoChanged(int clientNum)
{
if (!Scr_IsSystemActive())
return;
if ( ! codecallback_userinfochanged)
{
ClientUserinfoChanged(clientNum);
return;
}
stackPushInt(clientNum); // one parameter is required
short ret = Scr_ExecEntThread(&g_entities[clientNum], codecallback_userinfochanged, 1);
Scr_FreeThread(ret);
}
void custom_SV_WriteDownloadToClient(client_t *cl, msg_t *msg)
{
int curindex;
int iwdFile;
char errorMessage[COD2_MAX_STRINGLENGTH];
if (cl->state == CS_ACTIVE)
return; // Client already in game
if (!*cl->downloadName)
return; // Nothing being downloaded
if (strlen(cl->downloadName) < 4)
return; // File length too short
if (strcmp(&cl->downloadName[strlen(cl->downloadName) - 4], ".iwd") != 0)
return; // Not a iwd file
#if COD_VERSION == COD2_1_2 || COD_VERSION == COD2_1_3
if ( cl->wwwDlAck )
return; // wwwDl acknowleged
#endif
if (strlen(sv_downloadMessage->string))
{
Com_sprintf(errorMessage, sizeof(errorMessage), sv_downloadMessage->string);
MSG_WriteByte( msg, svc_download );
MSG_WriteShort( msg, 0 ); // client is expecting block zero
MSG_WriteLong( msg, -1 ); // illegal file size
MSG_WriteString( msg, errorMessage );
*cl->downloadName = 0;
return; // Download message instead of download
}
#if COD_VERSION == COD2_1_2 || COD_VERSION == COD2_1_3
if (sv_wwwDownload->boolean && cl->wwwDownload)
{
if (!cl->wwwDl_failed)
{
SV_WWWRedirectClient(cl, msg);
return; // wwwDl redirect
}
}
#endif
// Hardcode client variables to make max download speed for everyone
cl->state = CS_CONNECTED;
cl->rate = 25000;
cl->snapshotMsec = 50;
if (!cl->download)
{
// We open the file here
Com_Printf("clientDownload: %d : begining \"%s\"\n", cl - svs.clients, cl->downloadName);
iwdFile = FS_iwIwd(cl->downloadName, "main");
if ( !sv_allowDownload->integer || iwdFile || ( cl->downloadSize = FS_SV_FOpenFileRead( cl->downloadName, &cl->download ) ) <= 0 )
{
// cannot auto-download file
if (iwdFile)
{
Com_Printf("clientDownload: %d : \"%s\" cannot download iwd files\n", cl - svs.clients, cl->downloadName);
Com_sprintf(errorMessage, sizeof(errorMessage), "EXE_CANTAUTODLGAMEIWD\x15%s", cl->downloadName);
}
else if ( !sv_allowDownload->boolean )
{
Com_Printf("clientDownload: %d : \"%s\" download disabled\n", cl - svs.clients, cl->downloadName);
if (sv_pure->boolean)
Com_sprintf(errorMessage, sizeof(errorMessage), "EXE_AUTODL_SERVERDISABLED_PURE\x15%s", cl->downloadName);
else
Com_sprintf(errorMessage, sizeof(errorMessage), "EXE_AUTODL_SERVERDISABLED\x15%s", cl->downloadName);
}
else
{
Com_Printf("clientDownload: %d : \"%s\" file not found on server\n", cl - svs.clients, cl->downloadName);
Com_sprintf(errorMessage, sizeof(errorMessage), "EXE_AUTODL_FILENOTONSERVER\x15%s", cl->downloadName);
}
MSG_WriteByte( msg, svc_download );
MSG_WriteShort( msg, 0 ); // client is expecting block zero
MSG_WriteLong( msg, -1 ); // illegal file size
MSG_WriteString( msg, errorMessage );
*cl->downloadName = 0;
return;
}
// Init
cl->downloadCurrentBlock = cl->downloadClientBlock = cl->downloadXmitBlock = 0;
cl->downloadCount = 0;
cl->downloadEOF = qfalse;
}
// Perform any reads that we need to
while (cl->downloadCurrentBlock - cl->downloadClientBlock < MAX_DOWNLOAD_WINDOW && cl->downloadSize != cl->downloadCount)
{
curindex = (cl->downloadCurrentBlock % MAX_DOWNLOAD_WINDOW);
if (!cl->downloadBlocks[curindex])
cl->downloadBlocks[curindex] = (unsigned char *)Z_MallocInternal(MAX_DOWNLOAD_BLKSIZE);
cl->downloadBlockSize[curindex] = FS_Read( cl->downloadBlocks[curindex], MAX_DOWNLOAD_BLKSIZE, cl->download );
if (cl->downloadBlockSize[curindex] < 0)
{
// EOF right now
cl->downloadCount = cl->downloadSize;
break;
}
cl->downloadCount += cl->downloadBlockSize[curindex];
// Load in next block
cl->downloadCurrentBlock++;
}
// Check to see if we have eof condition and add the EOF block
if (cl->downloadCount == cl->downloadSize && !cl->downloadEOF && cl->downloadCurrentBlock - cl->downloadClientBlock < MAX_DOWNLOAD_WINDOW)
{
cl->downloadBlockSize[cl->downloadCurrentBlock % MAX_DOWNLOAD_WINDOW] = 0;
cl->downloadCurrentBlock++;
cl->downloadEOF = qtrue; // We have added the EOF block
}
// Write out the next section of the file, if we have already reached our window,
// automatically start retransmitting
if (cl->downloadClientBlock == cl->downloadCurrentBlock)
return; // Nothing to transmit
if (cl->downloadXmitBlock == cl->downloadCurrentBlock)
{
// We have transmitted the complete window, should we start resending?
//FIXME: This uses a hardcoded one second timeout for lost blocks
//the timeout should be based on client rate somehow
if (svs.time - cl->downloadSendTime > 1000)
cl->downloadXmitBlock = cl->downloadClientBlock;
else
return;
}
// Send current block
curindex = (cl->downloadXmitBlock % MAX_DOWNLOAD_WINDOW);
MSG_WriteByte( msg, svc_download );
MSG_WriteShort( msg, cl->downloadXmitBlock );
// block zero is special, contains file size
if ( cl->downloadXmitBlock == 0 )
MSG_WriteLong( msg, cl->downloadSize );
MSG_WriteShort( msg, cl->downloadBlockSize[curindex] );
// Write the block
if ( cl->downloadBlockSize[curindex] )
MSG_WriteData( msg, cl->downloadBlocks[curindex], cl->downloadBlockSize[curindex] );
Com_DPrintf("clientDownload: %d : writing block %d\n", cl - svs.clients, cl->downloadXmitBlock);
// Move on to the next block
// It will get sent with next snap shot. The rate will keep us in line.
cl->downloadXmitBlock++;
cl->downloadSendTime = svs.time;
}
// Segfault fix
int hook_BG_IsWeaponValid(int a1, int a2)
{
if ( !(unsigned char)sub_80E9758(a2) )
return 0;
if ( !(unsigned char)sub_80D9E84(a1 + 1348, a2) )
return 0;
int weapon = (int)BG_WeaponDefs(a2);
if ( !weapon )
return 0;
if ( !*(long *)(weapon + 132) && *(char *)(a1 + 1365) != a2 && *(char *)(a1 + 1366) != a2 && *(long *)(weapon + 876) != a2 )
return 0;
return 1;
}
char *custom_va(const char *format, ...)
{
char *s;
va_list va;
int v1;
signed int v3;
v1 = Sys_GetValue(1);
s = (char *)(v1 + (*(int *)(v1 + 2048) << 10));
v3 = *(int *)(v1 + 2048) + 1;
*(int *)(v1 + 2048) = v3 / 2;
*(int *)(v1 + 2048) = v3 - 2 * *(int *)(v1 + 2048);
va_start(va, format);
vsnprintf(s, COD2_MAX_STRINGLENGTH, format, va);
va_end(va);
s[COD2_MAX_STRINGLENGTH - 1] = '\0';
return s;
}
void hook_SV_VerifyIwds_f(client_t *cl)
{
if (sv_pure->boolean)
cl->pureAuthentic = 1;
}
void hook_SV_ResetPureClient_f(client_t *cl)
{
cl->pureAuthentic = 0;
if (codecallback_vid_restart && Scr_IsSystemActive())
{
if (cl->gentity == NULL)
return;
stackPushInt(cl - svs.clients);
short ret = Scr_ExecEntThread(cl->gentity, codecallback_vid_restart, 1);
Scr_FreeThread(ret);
}
}
// Adds bot pings and removes spam on 1.2 and 1.3
void custom_SV_CalcPings( void )
{
int i, j;
client_t *cl;
int total, count;
int delta;
for ( i = 0 ; i < sv_maxclients->integer ; i++ )
{
cl = &svs.clients[i];
if ( cl->state != CS_ACTIVE )
{
cl->ping = -1;
continue;
}
if ( !cl->gentity )
{
cl->ping = -1;
continue;
}
if ( cl->netchan.remoteAddress.type == NA_BOT )
{
cl->ping = 0;
cl->lastPacketTime = svs.time;
continue;
}
total = 0;
count = 0;
for ( j = 0 ; j < PACKET_BACKUP ; j++ )
{
if ( cl->frames[j].messageAcked == 0xFFFFFFFF )
continue;
delta = cl->frames[j].messageAcked - cl->frames[j].messageSent;
count++;
total += delta;
}
if ( !count )
cl->ping = 999;
else
{
cl->ping = total / count;
if ( cl->ping > 999 )
cl->ping = 999;
}
}
}
void custom_SV_CheckTimeouts( void )
{
int i;
client_t *cl;
int droppoint;
int zombiepoint;
droppoint = svs.time - 1000 * sv_timeout->integer;
zombiepoint = svs.time - 1000 * sv_zombietime->integer;
for ( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
{
// message times may be wrong across a changelevel
if (cl->lastPacketTime > svs.time)
cl->lastPacketTime = svs.time;
if (cl->state == CS_ZOMBIE && cl->lastPacketTime < zombiepoint)
{
cl->state = CS_FREE; // can now be reused
continue;
}
if (cl->state >= CS_CONNECTED && cl->lastPacketTime < droppoint)
{
// wait several frames so a debugger session doesn't
// cause a timeout
if ( ++cl->timeoutCount > 5 )
{
SV_DropClient(cl, "EXE_TIMEDOUT");
cl->state = CS_FREE; // don't bother with zombie state
}
}
else
cl->timeoutCount = 0;
}
}
#if COMPILE_BOTS == 1
int bot_buttons[MAX_CLIENTS] = {0};
int bot_weapon[MAX_CLIENTS] = {0};
char bot_forwardmove[MAX_CLIENTS] = {0};
char bot_rightmove[MAX_CLIENTS] = {0};
void custom_SV_BotUserMove(client_t *client)
{
int num;
usercmd_t ucmd = {0};
if (client->gentity == NULL)
return;
num = client - svs.clients;
ucmd.serverTime = svs.time;
playerState_t *ps = SV_GameClientNum(num);
gentity_t *ent = SV_GentityNum(num);
if (bot_weapon[num])
ucmd.weapon = (byte)(bot_weapon[num] & 0xFF);
else
ucmd.weapon = (byte)(ps->weapon & 0xFF);
if (ent->client == NULL)
return;
if (ent->client->sess.archiveTime == 0)
{
ucmd.buttons = bot_buttons[num];
ucmd.forwardmove = bot_forwardmove[num];
ucmd.rightmove = bot_rightmove[num];
VectorCopy(ent->client->sess.cmd.angles, ucmd.angles);
}
client->deltaMessage = client->netchan.outgoingSequence - 1;
SV_ClientThink(client, &ucmd);
}
#endif
void hook_scriptError(int a1, int a2, int a3, void *a4)
{
if (developer->integer == 2)
runtimeError(0, a1, a2, a3);
else
scriptError(a1, a2, a3, a4);
}
int player_sw_pickup[MAX_CLIENTS] = {1};
int touch_item(gentity_t * item, gentity_t * entity, int touch)
{
if (!player_sw_pickup[entity->client->ps.clientNum])
return 0;
hook_touch_item->unhook();
int (*sig)(gentity_t *, gentity_t *, int);
*(int *)&sig = hook_touch_item->from;
int ret = sig(item, entity, touch);
hook_touch_item->hook();
return ret;
}
#if COMPILE_PLAYER == 1
int gamestate_size[MAX_CLIENTS] = {0};
void hook_gamestate_info(const char *format, ...)
{
char s[COD2_MAX_STRINGLENGTH];
va_list va;
va_start(va, format);
vsnprintf(s, sizeof(s), format, va);
va_end(va);
Com_DPrintf("%s", s);
char *tok;
int gamestate = 0;
int clientnum = 0;
tok = strtok(s, " ");
for (int i = 0; tok != NULL; i++)
{
if (i == 1)
gamestate = atoi(tok);
if (i == 7)
clientnum = atoi(tok);
tok = strtok(NULL, " ");
}
gamestate_size[clientnum] = gamestate;
}
int clientfps[MAX_CLIENTS] = {0};
int tempfps[MAX_CLIENTS] = {0};
int fpstime[MAX_CLIENTS] = {0};
int previousbuttons[MAX_CLIENTS] = {0};
int play_movement(client_t *cl, usercmd_t *ucmd)
{
hook_play_movement->unhook();
int (*sig)(client_t *cl, usercmd_t *ucmd);
*(int *)&sig = hook_play_movement->from;
int ret = sig(cl, ucmd);
hook_play_movement->hook();
int clientnum = cl - svs.clients;
tempfps[clientnum]++;
if (Sys_MilliSeconds() >= (fpstime[clientnum] + 1000))
{
clientfps[clientnum] = tempfps[clientnum];
fpstime[clientnum] = Sys_MilliSeconds();
tempfps[clientnum] = 0;
}
if(ucmd->buttons & KEY_MASK_MELEE && !(previousbuttons[clientnum] & KEY_MASK_MELEE))
{
if(codecallback_meleebutton)
{
short ret = Scr_ExecEntThread(cl->gentity, codecallback_meleebutton, 0);
Scr_FreeThread(ret);
}
}
if(ucmd->buttons & KEY_MASK_USE && !(previousbuttons[clientnum] & KEY_MASK_USE))
{
if(codecallback_usebutton)
{
short ret = Scr_ExecEntThread(cl->gentity, codecallback_usebutton, 0);
Scr_FreeThread(ret);
}
}
if(ucmd->buttons & KEY_MASK_FIRE && !(previousbuttons[clientnum] & KEY_MASK_FIRE))
{
if(codecallback_attackbutton)
{
short ret = Scr_ExecEntThread(cl->gentity, codecallback_attackbutton, 0);
Scr_FreeThread(ret);
}
}
previousbuttons[clientnum] = ucmd->buttons;
return ret;
}
int player_g_speed[MAX_CLIENTS] = {0};
int player_g_gravity[MAX_CLIENTS] = {0};
int play_endframe(gentity_t *ent)
{
hook_play_endframe->unhook();
int (*sig)(gentity_t *ent);
*(int *)&sig = hook_play_endframe->from;
int ret = sig(ent);
hook_play_endframe->hook();
if (ent->client->sess.state == STATE_PLAYING)
{
int num = ent - g_entities;
if (player_g_speed[num] > 0)
ent->client->ps.speed = player_g_speed[num];
if (player_g_gravity[num] > 0)
ent->client->ps.gravity = player_g_gravity[num];
}
return ret;
}
int custom_animation[MAX_CLIENTS] = {0};
int set_anim(playerState_t *ps, int animNum, animBodyPart_t bodyPart, int forceDuration, qboolean setTimer, qboolean isContinue, qboolean force)
{
hook_set_anim->unhook();
int (*sig)(playerState_t *ps, int animNum, animBodyPart_t bodyPart, int forceDuration, qboolean setTimer, qboolean isContinue, qboolean force);
*(int *)&sig = hook_set_anim->from;
int ret;
if (!custom_animation[ps->clientNum])
ret = sig(ps, animNum, bodyPart, forceDuration, setTimer, isContinue, force);
else
ret = sig(ps, custom_animation[ps->clientNum], bodyPart, forceDuration, qtrue, isContinue, qtrue);
hook_set_anim->hook();
return ret;
}
#endif
#if COMPILE_RATELIMITER == 1
// ioquake3 rate limit connectionless requests
// https://github.com/ioquake/ioq3/blob/master/code/server/sv_main.c
// This is deliberately quite large to make it more of an effort to DoS
#define MAX_BUCKETS 16384
#define MAX_HASHES 1024
static leakyBucket_t buckets[ MAX_BUCKETS ];
static leakyBucket_t* bucketHashes[ MAX_HASHES ];
leakyBucket_t outboundLeakyBucket;
static long SVC_HashForAddress( netadr_t address )
{
unsigned char *ip = address.ip;
int i;
long hash = 0;
for ( i = 0; i < 4; i++ )
{
hash += (long)( ip[ i ] ) * ( i + 119 );
}
hash = ( hash ^ ( hash >> 10 ) ^ ( hash >> 20 ) );
hash &= ( MAX_HASHES - 1 );
return hash;
}
static leakyBucket_t *SVC_BucketForAddress( netadr_t address, int burst, int period )
{
leakyBucket_t *bucket = NULL;
int i;
long hash = SVC_HashForAddress( address );
int now = Sys_MilliSeconds();
for ( bucket = bucketHashes[ hash ]; bucket; bucket = bucket->next )
{
if ( memcmp( bucket->adr, address.ip, 4 ) == 0 )
{
return bucket;
}
}
for ( i = 0; i < MAX_BUCKETS; i++ )
{
int interval;
bucket = &buckets[ i ];
interval = now - bucket->lastTime;
// Reclaim expired buckets
if ( bucket->lastTime > 0 && ( interval > ( burst * period ) ||
interval < 0 ) )
{
if ( bucket->prev != NULL )
{
bucket->prev->next = bucket->next;
}
else
{
bucketHashes[ bucket->hash ] = bucket->next;
}
if ( bucket->next != NULL )
{
bucket->next->prev = bucket->prev;
}
memset( bucket, 0, sizeof( leakyBucket_t ) );
}
if ( bucket->type == 0 )
{
bucket->type = address.type;
memcpy( bucket->adr, address.ip, 4 );
bucket->lastTime = now;
bucket->burst = 0;
bucket->hash = hash;
// Add to the head of the relevant hash chain
bucket->next = bucketHashes[ hash ];
if ( bucketHashes[ hash ] != NULL )
{
bucketHashes[ hash ]->prev = bucket;
}
bucket->prev = NULL;
bucketHashes[ hash ] = bucket;
return bucket;
}
}
// Couldn't allocate a bucket for this address
return NULL;
}
bool SVC_RateLimit( leakyBucket_t *bucket, int burst, int period )
{
if ( bucket != NULL )
{
int now = Sys_MilliSeconds();
int interval = now - bucket->lastTime;
int expired = interval / period;
int expiredRemainder = interval % period;
if ( expired > bucket->burst || interval < 0 )
{
bucket->burst = 0;
bucket->lastTime = now;
}
else
{
bucket->burst -= expired;
bucket->lastTime = now - expiredRemainder;
}
if ( bucket->burst < burst )
{
bucket->burst++;
return false;
}
}
return true;
}
bool SVC_RateLimitAddress( netadr_t from, int burst, int period )
{
leakyBucket_t *bucket = SVC_BucketForAddress( from, burst, period );
return SVC_RateLimit( bucket, burst, period );
}
bool SVC_callback(const char * str, const char * ip)
{
if( codecallback_client_spam && Scr_IsSystemActive())
{
stackPushString(ip);
stackPushString(str);
short ret = Scr_ExecThread(codecallback_client_spam, 2);
Scr_FreeThread(ret);
return true;
}
return false;
}
void hook_SVC_RemoteCommand(netadr_t from, msg_t *msg)
{
if (!sv_allowRcon->boolean)
return;
// Prevent using rcon as an amplifier and make dictionary attacks impractical
if ( SVC_RateLimitAddress( from, 10, 1000 ) )
{
if (!SVC_callback("RCON:ADDRESS", NET_AdrToString(from)))
Com_DPrintf("SVC_RemoteCommand: rate limit from %s exceeded, dropping request\n", NET_AdrToString(from));
return;
}
if ( !strlen( rcon_password->string ) || strcmp(Cmd_Argv(1), rcon_password->string) != 0 )
{
static leakyBucket_t bucket;
// Make DoS via rcon impractical
if ( SVC_RateLimit( &bucket, 10, 1000 ) )
{
if (!SVC_callback("RCON:GLOBAL", NET_AdrToString(from)))
Com_DPrintf("SVC_RemoteCommand: rate limit exceeded, dropping request\n");
return;
}
}
if (codecallback_remotecommand)
{
stackPushInt((int)msg);
stackPushString((char *)msg->data);
stackPushString(NET_AdrToString(from));
short ret = Scr_ExecThread(codecallback_remotecommand, 3);
Scr_FreeThread(ret);
return;
}
#if COD_VERSION == COD2_1_0
int lasttime_offset = 0x0848B674;