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sv_main.c
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sv_main.c
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/*
* Wolfenstein: Enemy Territory GPL Source Code
* Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company.
*
* ET: Legacy
* Copyright (C) 2012-2017 ET:Legacy team <mail@etlegacy.com>
*
* This file is part of ET: Legacy - http://www.etlegacy.com
*
* ET: Legacy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ET: Legacy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ET: Legacy. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, Wolfenstein: Enemy Territory GPL Source Code is also
* subject to certain additional terms. You should have received a copy
* of these additional terms immediately following the terms and conditions
* of the GNU General Public License which accompanied the source code.
* If not, please request a copy in writing from id Software at the address below.
*
* id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
*/
/**
* @file sv_main.c
*/
#include "server.h"
#ifdef FEATURE_TRACKER
#include "sv_tracker.h"
#endif
serverStatic_t svs; // persistant server info
server_t sv; // local server
vm_t *gvm = NULL; // game virtual machine
cvar_t *sv_fps = NULL; // time rate for running non-clients
cvar_t *sv_timeout; // seconds without any message
cvar_t *sv_zombietime; // seconds to sink messages after disconnect
cvar_t *sv_rconPassword; // password for remote server commands
cvar_t *sv_privatePassword; // password for the privateClient slots
cvar_t *sv_allowDownload;
cvar_t *sv_maxclients;
cvar_t *sv_democlients; // number of slots reserved for playing a demo
cvar_t *sv_privateClients; // number of clients reserved for password
cvar_t *sv_hostname;
cvar_t *sv_reconnectlimit; // minimum seconds between connect messages
cvar_t *sv_tempbanmessage;
cvar_t *sv_padPackets; // add nop bytes to messages
cvar_t *sv_killserver; // menu system can set to 1 to shut server down
cvar_t *sv_mapname;
cvar_t *sv_mapChecksum;
cvar_t *sv_serverid;
cvar_t *sv_minRate;
cvar_t *sv_maxRate;
cvar_t *sv_minPing;
cvar_t *sv_maxPing;
cvar_t *sv_gametype;
cvar_t *sv_pure;
cvar_t *sv_floodProtect;
cvar_t *sv_lanForceRate; // dedicated 1 (LAN) server forces local client rates to 99999 (bug #491)
cvar_t *sv_onlyVisibleClients;
cvar_t *sv_friendlyFire;
cvar_t *sv_maxlives;
cvar_t *sv_needpass;
cvar_t *sv_dl_timeout; // seconds without any message when cl->state != CS_ACTIVE
cvar_t *sv_showAverageBPS; // net debugging
cvar_t *sv_wwwDownload; // server does a www dl redirect
cvar_t *sv_wwwBaseURL; // base URL for redirect
// tell clients to perform their downloads while disconnected from the server
// this gets you a better throughput, but you loose the ability to control the download usage
cvar_t *sv_wwwDlDisconnected;
cvar_t *sv_wwwFallbackURL; // URL to send to if an http/ftp fails or is refused client side
cvar_t *sv_cheats;
cvar_t *sv_packetdelay;
cvar_t *sv_fullmsg;
cvar_t *sv_dlRate;
// do we communicate with others ?
cvar_t *sv_advert; // 0 - no big brothers
// 1 - communicate with master server
// 2 - communicate with tracker
// server attack protection
cvar_t *sv_protect; // 0 - unprotected
// 1 - ioquake3 method (default)
// 2 - OpenWolf method
// 4 - prints attack info to console (when ioquake3 or OPenWolf method is set)
cvar_t *sv_protectLog; // name of log file
#ifdef FEATURE_ANTICHEAT
cvar_t *sv_wh_active;
cvar_t *sv_wh_bbox_horz;
cvar_t *sv_wh_bbox_vert;
cvar_t *sv_wh_check_fov;
#endif
cvar_t *sv_demopath;
cvar_t *sv_demoState;
cvar_t *sv_autoDemo;
cvar_t *cl_freezeDemo; // to freeze server-side demos
cvar_t *sv_demoTolerant;
cvar_t *sv_ipMaxClients;
static void SVC_Status(netadr_t from, qboolean force);
/*
=============================================================================
EVENT MESSAGES
=============================================================================
*/
/**
* @brief Converts newlines to "\\n" so a line prints nicer
* @param in
* @return
*/
static char *SV_ExpandNewlines(char *in)
{
static char string[1024];
size_t l = 0;
while (*in && l < sizeof(string) - 3)
{
if (*in == '\n')
{
string[l++] = '\\';
string[l++] = 'n';
}
else
{
// HACK: strip out localization tokens before string command is displayed in syscon window
if (!Q_strncmp(in, "[lon]", 5) || !Q_strncmp(in, "[lof]", 5))
{
in += 5;
continue;
}
string[l++] = *in;
}
in++;
}
string[l] = 0;
return string;
}
/**
* @brief The given command will be transmitted to the client, and is guaranteed
* to not have future snapshot_t executed before it is executed
*
* @param[in,out] client
* @param[in] cmd
*/
void SV_AddServerCommand(client_t *client, const char *cmd)
{
int index;
client->reliableSequence++;
// if we would be losing an old command that hasn't been acknowledged,
// we must drop the connection
// we check == instead of >= so a broadcast print added by SV_DropClient()
// doesn't cause a recursive drop client
if (client->reliableSequence - client->reliableAcknowledge == MAX_RELIABLE_COMMANDS + 1)
{
int i;
Com_Printf("===== pending server commands =====\n");
for (i = client->reliableAcknowledge + 1 ; i <= client->reliableSequence ; i++)
{
Com_Printf("cmd %5d: %s\n", i, client->reliableCommands[i & (MAX_RELIABLE_COMMANDS - 1)]);
}
Com_Printf("cmd %5d: %s\n", i, cmd);
SV_DropClient(client, "Server command overflow");
return;
}
index = client->reliableSequence & (MAX_RELIABLE_COMMANDS - 1);
Q_strncpyz(client->reliableCommands[index], cmd, sizeof(client->reliableCommands[index]));
}
/**
* @brief Sends a reliable command string to be interpreted by the client game
* module: "cp", "print", "chat", etc
*
* A NULL client will broadcast to all clients
*
* @param[in] cl
* @param[in] fmt
*/
void QDECL SV_SendServerCommand(client_t *cl, const char *fmt, ...)
{
va_list argptr;
byte message[MAX_MSGLEN];
client_t *client;
int j;
va_start(argptr, fmt);
Q_vsnprintf((char *)message, sizeof(message), fmt, argptr);
va_end(argptr);
// do not forward server command messages that would be too big to clients
// ( q3infoboom / q3msgboom stuff )
// see http://aluigi.altervista.org/adv/q3msgboom-adv.txt
if (strlen((char *)message) > 1022)
{
SV_WriteAttackLog("Warning: q3infoboom/q3msgboom exploit attack.\n"); // FIXME: add client slot
return;
}
if (cl != NULL)
{
SV_AddServerCommand(cl, (char *)message);
return;
}
// hack to echo broadcast prints to console
if (com_dedicated->integer && !strncmp((char *)message, "print", 5))
{
Com_Printf("broadcast: %s\n", SV_ExpandNewlines((char *)message));
}
// save broadcasts to demo
// note: in the case a command is only issued to a specific client, it is NOT recorded (see above when cl != NULL). If you want to record them, just place this code above, but be warned that it may be dangerous (such as "disconnect" command) because server commands will be replayed to every connected clients!
if (sv.demoState == DS_RECORDING)
{
SV_DemoWriteServerCommand((char *)message);
}
// send the data to all relevant clients
for (j = 0, client = svs.clients; j < sv_maxclients->integer ; j++, client++)
{
if (client->state < CS_PRIMED)
{
continue;
}
// don't need to send messages to AI
if (client->gentity && (client->gentity->r.svFlags & SVF_BOT))
{
continue;
}
SV_AddServerCommand(client, (char *)message);
}
}
/*
==============================================================================
MASTER SERVER FUNCTIONS
==============================================================================
*/
#define HEARTBEAT_MSEC 300 * 1000
#define HEARTBEAT_GAME "EnemyTerritory-1"
#define HEARTBEAT_DEAD "ETFlatline-1"
/**
* @brief Send a message to the masters every few minutes to let it know we are
* alive, and log information.
*
* We will also have a heartbeat sent when a server changes from empty to
* non-empty, and full to non-full, but not on every player enter or exit.
*
* @param[in] msg
*/
void SV_MasterHeartbeat(const char *msg)
{
static netadr_t adr[MAX_MASTER_SERVERS][2]; // [2] for v4 and v6 address for the same address string.
int i;
int res;
int netenabled;
char *master;
if (!(sv_advert->integer & SVA_MASTER))
{
return;
}
netenabled = Cvar_VariableIntegerValue("net_enabled");
// "dedicated 1" is for lan play, "dedicated 2" is for inet public play
if (!com_dedicated || com_dedicated->integer != 2 || !(netenabled & (
#ifdef FEATURE_IPV6
NET_ENABLEV6 |
#endif
NET_ENABLEV4)))
{
return; // only dedicated servers send heartbeats
}
// if not time yet, don't send anything
if (svs.time < svs.nextHeartbeatTime)
{
return;
}
svs.nextHeartbeatTime = svs.time + HEARTBEAT_MSEC;
// send to group masters
for (i = 0; i < MAX_MASTER_SERVERS; i++)
{
master = Cvar_VariableString(va("sv_master%i", i + 1));
if (master[0] == '\0')
{
continue;
}
// see if we haven't already resolved the name
if (netenabled & NET_ENABLEV4)
{
if (adr[i][0].type == NA_BAD)
{
Com_Printf("Resolving %s (IPv4)\n", master);
res = NET_StringToAdr(master, &adr[i][0], NA_IP);
if (res == 2)
{
// if no port was specified, use the default master port
adr[i][0].port = BigShort(PORT_MASTER);
}
if (res)
{
Com_Printf("%s resolved to %s\n", master, NET_AdrToString(adr[i][0]));
}
else
{
Com_Printf("%s has no IPv4 address.\n", master);
}
}
}
#ifdef FEATURE_IPV6
if (netenabled & NET_ENABLEV6)
{
if (adr[i][1].type == NA_BAD)
{
Com_Printf("Resolving %s (IPv6)\n", master);
res = NET_StringToAdr(master, &adr[i][1], NA_IP6);
if (res == 2)
{
// if no port was specified, use the default master port
adr[i][1].port = BigShort(PORT_MASTER);
}
if (res)
{
Com_Printf("%s resolved to %s\n", master, NET_AdrToString(adr[i][1]));
}
else
{
Com_Printf("%s has no IPv6 address.\n", master);
}
}
}
#endif
if ((((netenabled & NET_ENABLEV4) && adr[i][0].type == NA_BAD) || !(netenabled & NET_ENABLEV4))
&& (((netenabled & NET_ENABLEV6) && adr[i][1].type == NA_BAD) || !(netenabled & NET_ENABLEV6)))
{
// if the address failed to resolve, clear it
// so we don't take repeated dns hits
Com_Printf("Couldn't resolve address: %s\n", master);
Cvar_Set(va("sv_master%i", i + 1), "");
continue;
}
Com_Printf("Sending heartbeat to %s\n", master);
// this command should be changed if the server info / status format
// ever incompatably changes
if ((netenabled & NET_ENABLEV4) && adr[i][0].type != NA_BAD)
{
NET_OutOfBandPrint(NS_SERVER, adr[i][0], "heartbeat %s\n", msg);
}
#ifdef FEATURE_IPV6
if (netenabled & NET_ENABLEV6 && adr[i][1].type != NA_BAD)
{
NET_OutOfBandPrint(NS_SERVER, adr[i][1], "heartbeat %s\n", message);
}
#endif
}
}
/**
* @brief Sends gameCompleteStatus messages to all master servers
*/
void SV_MasterGameCompleteStatus()
{
static netadr_t adr[MAX_MASTER_SERVERS][2]; // [2] for v4 and v6 address for the same address string.
int i;
int res;
int netenabled;
char *master;
if (!(sv_advert->integer & SVA_MASTER))
{
return;
}
netenabled = Cvar_VariableIntegerValue("net_enabled");
// "dedicated 1" is for lan play, "dedicated 2" is for inet public play
if (!com_dedicated || com_dedicated->integer != 2 || !(netenabled & (
#ifdef FEATURE_IPV6
NET_ENABLEV6 |
#endif
NET_ENABLEV4)))
{
return; // only dedicated servers send heartbeats
}
// send to group masters
for (i = 0; i < MAX_MASTER_SERVERS; i++)
{
master = Cvar_VariableString(va("sv_master%i", i + 1));
if (master[0] == '\0')
{
continue;
}
// see if we haven't already resolved the name
if (netenabled & NET_ENABLEV4)
{
if (adr[i][0].type == NA_BAD)
{
Com_Printf("Resolving %s (IPv4)\n", master);
res = NET_StringToAdr(master, &adr[i][0], NA_IP);
if (res == 2)
{
// if no port was specified, use the default master port
adr[i][0].port = BigShort(PORT_MASTER);
}
if (res)
{
Com_Printf("%s resolved to %s\n", master, NET_AdrToString(adr[i][0]));
}
else
{
Com_Printf("%s has no IPv4 address.\n", master);
}
}
}
#ifdef FEATURE_IPV6
if (netenabled & NET_ENABLEV6)
{
if (adr[i][1].type == NA_BAD)
{
Com_Printf("Resolving %s (IPv6)\n", master);
res = NET_StringToAdr(master, &adr[i][1], NA_IP6);
if (res == 2)
{
// if no port was specified, use the default master port
adr[i][1].port = BigShort(PORT_MASTER);
}
if (res)
{
Com_Printf("%s resolved to %s\n", master, NET_AdrToString(adr[i][1]));
}
else
{
Com_Printf("%s has no IPv6 address.\n", master);
}
}
}
#endif
if ((((netenabled & NET_ENABLEV4) && adr[i][0].type == NA_BAD) || !(netenabled & NET_ENABLEV4))
&& (((netenabled & NET_ENABLEV6) && adr[i][1].type == NA_BAD) || !(netenabled & NET_ENABLEV6)))
{
// if the address failed to resolve, clear it
// so we don't take repeated dns hits
Com_Printf("Couldn't resolve address: %s\n", master);
Cvar_Set(va("sv_master%i", i + 1), "");
continue;
}
Com_Printf("Sending gameCompleteStatus to %s\n", master);
// this command should be changed if the server info / status format
// ever incompatably changes
if ((netenabled & NET_ENABLEV4) && adr[i][0].type != NA_BAD)
{
SVC_Status(adr[i][0], qtrue);
}
#ifdef FEATURE_IPV6
if (netenabled & NET_ENABLEV6 && adr[i][1].type != NA_BAD)
{
SVC_Status(adr[i][1], qtrue);
}
#endif
}
#ifdef FEATURE_TRACKER
Tracker_MapEnd();
#endif
}
/**
* @brief Informs all masters that this server is going down
*/
void SV_MasterShutdown(void)
{
svs.nextHeartbeatTime = -9999; // send a hearbeat right now
SV_MasterHeartbeat(HEARTBEAT_DEAD);
// when the master tries to poll the server, it won't respond, so
// it will be removed from the list
}
/*
==============================================================================
CONNECTIONLESS COMMANDS
==============================================================================
*/
static leakyBucket_t buckets[MAX_BUCKETS];
static leakyBucket_t *bucketHashes[MAX_HASHES];
leakyBucket_t outboundLeakyBucket;
/**
* @brief SVC_HashForAddress
* @param[in] address
* @return
*/
static long SVC_HashForAddress(netadr_t address)
{
byte *ip = NULL;
size_t size = 0;
unsigned int i;
long hash = 0;
switch (address.type)
{
case NA_IP: ip = address.ip; size = 4;
break;
case NA_IP6: ip = address.ip6; size = 16;
break;
default:
break;
}
if (!ip)
{
Com_Printf("SVC_HashForAddress: Invalid IP - hash value is 0.\n");
return 0;
}
for (i = 0; i < size; i++)
{
hash += (long)((ip[i]) * (i + 119));
}
hash = (hash ^ (hash >> 10) ^ (hash >> 20));
hash &= (MAX_HASHES - 1);
return hash;
}
/**
* @brief Find or allocate a bucket for an address
* @param[in] address
* @param[in] burst
* @param[in] period
* @return
*/
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)
{
switch (bucket->type)
{
case NA_IP:
if (memcmp(bucket->ipv._4, address.ip, 4) == 0)
{
return bucket;
}
break;
case NA_IP6:
if (memcmp(bucket->ipv._6, address.ip6, 16) == 0)
{
return bucket;
}
break;
default:
break;
}
}
// make sure we will never use time 0
now = now ? now : 1;
for (i = 0; i < MAX_BUCKETS; i++)
{
int interval;
bucket = &buckets[i];
interval = now - bucket->lastTime;
// Reclaim expired buckets
if (bucket->lastTime > 0 && (unsigned) interval > (burst * period))
{
if (bucket->prev != NULL)
{
bucket->prev->next = bucket->next;
}
else
{
bucketHashes[bucket->hash] = bucket->next;
}
if (bucket->next != NULL)
{
bucket->next->prev = bucket->prev;
}
Com_Memset(bucket, 0, sizeof(leakyBucket_t));
}
if (bucket->type == NA_BAD)
{
bucket->type = address.type;
switch (address.type)
{
case NA_IP: Com_Memcpy(bucket->ipv._4, address.ip, 4);
break;
case NA_IP6: Com_Memcpy(bucket->ipv._6, address.ip6, 16);
break;
default:
break;
}
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
// Write the info to the attack log since this is relevant information as the system is malfunctioning
SV_WriteAttackLogD(va("SVC_BucketForAddress: Could not allocate a bucket for client from %s\n", NET_AdrToString(address)));
return NULL;
}
/**
* @brief SVC_RateLimit
* @param[in,out] bucket
* @param[in] burst
* @param[in] period
* @return
*
* @note Don't call if sv_protect 1 (SVP_IOQ3) flag is not set!
*/
qboolean 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 qfalse;
}
else
{
SV_WriteAttackLogD(va("SVC_RateLimit: burst limit exceeded for bucket: %i limit: %i\n", bucket->burst, burst));
}
}
return qtrue;
}
/**
* @brief Rate limit for a particular address
* @param from
* @param burst
* @param period
* @return
*
* @note Don't call if sv_protect 1 (SVP_IOQ3) flag is not set!
*/
qboolean SVC_RateLimitAddress(netadr_t from, int burst, int period)
{
leakyBucket_t *bucket = SVC_BucketForAddress(from, burst, period);
return SVC_RateLimit(bucket, burst, period);
}
/**
* @brief Send serverinfo cvars, etc to master servers when game complete or
* by request of getstatus calls.
*
* Useful for tracking global player stats.
*
* @param[in] from
* @param[in] force toogles rate limit checks
*/
static void SVC_Status(netadr_t from, qboolean force)
{
char player[1024];
char status[MAX_MSGLEN];
int i;
client_t *cl;
playerState_t *ps;
unsigned int statusLength;
unsigned int playerLength;
char infostring[MAX_INFO_STRING];
if (!force && (sv_protect->integer & SVP_IOQ3))
{
// Prevent using getstatus as an amplifier
if (SVC_RateLimitAddress(from, 10, 1000))
{
SV_WriteAttackLog(va("SVC_Status: rate limit from %s exceeded, dropping request\n",
NET_AdrToString(from)));
return;
}
// Allow getstatus to be DoSed relatively easily, but prevent
// excess outbound bandwidth usage when being flooded inbound
if (SVC_RateLimit(&outboundLeakyBucket, 10, 100))
{
SV_WriteAttackLog("SVC_Status: rate limit exceeded, dropping request\n");
return;
}
}
// A maximum challenge length of 128 should be more than plenty.
if (strlen(Cmd_Argv(1)) > 128)
{
SV_WriteAttackLog(va("SVC_Status: challenge length exceeded from %s, dropping request\n", NET_AdrToString(from)));
return;
}
strcpy(infostring, Cvar_InfoString(CVAR_SERVERINFO | CVAR_SERVERINFO_NOUPDATE));
// echo back the parameter to status. so master servers can use it as a challenge
// to prevent timed spoofed reply packets that add ghost servers
Info_SetValueForKey(infostring, "challenge", Cmd_Argv(1));
Info_SetValueForKey(infostring, "version", ET_VERSION);
status[0] = 0;
statusLength = 0;
for (i = 0 ; i < sv_maxclients->integer ; i++)
{
cl = &svs.clients[i];
if (cl->state >= CS_CONNECTED)
{
ps = SV_GameClientNum(i);
Com_sprintf(player, sizeof(player), "%i %i \"%s\"\n",
ps->persistant[PERS_SCORE], cl->ping, cl->name);
playerLength = strlen(player);
if (statusLength + playerLength >= sizeof(status))
{
break; // can't hold any more
}
strcpy(status + statusLength, player);
statusLength += playerLength;
}
}
NET_OutOfBandPrint(NS_SERVER, from, "statusResponse\n%s\n%s", infostring, status);
}
/**
* @brief Responds with a short info message that should be enough to determine
* if a user is interested in a server to do a full status
*
* @param[in] from
*/
void SVC_Info(netadr_t from)
{
int i, players = 0, humans = 0;
char *gamedir;
char infostring[MAX_INFO_STRING];
char *antilag;
char *weaprestrict;
char *balancedteams;
if (sv_protect->integer & SVP_IOQ3)
{
// Prevent using getinfo as an amplifier
if (SVC_RateLimitAddress(from, 10, 1000))
{
SV_WriteAttackLog(va("SVC_Info: rate limit from %s exceeded, dropping request\n",
NET_AdrToString(from)));
return;
}
// Allow getinfo to be DoSed relatively easily, but prevent
// excess outbound bandwidth usage when being flooded inbound
if (SVC_RateLimit(&outboundLeakyBucket, 10, 100))
{
SV_WriteAttackLog("SVC_Info: rate limit exceeded, dropping request\n");
return;
}
}
// Check whether Cmd_Argv(1) has a sane length. This was not done in the original Quake3 version which led
// to the Infostring bug discovered by Luigi Auriemma. See http://aluigi.altervista.org/ for the advisory.
// A maximum challenge length of 128 should be more than plenty.
if (strlen(Cmd_Argv(1)) > 128)
{
SV_WriteAttackLog(va("SVC_Info: challenge length from %s exceeded, dropping request\n", NET_AdrToString(from)));
return;
}
// don't count privateclients
for (i = sv_privateClients->integer ; i < sv_maxclients->integer ; i++)
{
if (svs.clients[i].state >= CS_CONNECTED)
{
players++;
if (svs.clients[i].netchan.remoteAddress.type != NA_BOT)
{
humans++;
}
}
}
infostring[0] = 0;
// echo back the parameter to status. so servers can use it as a challenge
// to prevent timed spoofed reply packets that add ghost servers
Info_SetValueForKey(infostring, "challenge", Cmd_Argv(1));
Info_SetValueForKey(infostring, "version", ET_VERSION);
Info_SetValueForKey(infostring, "protocol", va("%i", PROTOCOL_VERSION));
Info_SetValueForKey(infostring, "hostname", sv_hostname->string);
Info_SetValueForKey(infostring, "serverload", va("%i", svs.serverLoad));
Info_SetValueForKey(infostring, "mapname", sv_mapname->string);
Info_SetValueForKey(infostring, "clients", va("%i", players));
Info_SetValueForKey(infostring, "humans", va("%i", humans));
Info_SetValueForKey(infostring, "sv_maxclients", va("%i", sv_maxclients->integer - sv_privateClients->integer - sv_democlients->integer));
Info_SetValueForKey(infostring, "gametype", va("%i", sv_gametype->integer));
Info_SetValueForKey(infostring, "pure", va("%i", sv_pure->integer));
if (sv_minPing->integer)
{
Info_SetValueForKey(infostring, "minPing", va("%i", sv_minPing->integer));
}
if (sv_maxPing->integer)
{
Info_SetValueForKey(infostring, "maxPing", va("%i", sv_maxPing->integer));
}
gamedir = Cvar_VariableString("fs_game");
if (*gamedir)
{
Info_SetValueForKey(infostring, "game", gamedir);
}
Info_SetValueForKey(infostring, "friendlyFire", va("%i", sv_friendlyFire->integer));
Info_SetValueForKey(infostring, "maxlives", va("%i", sv_maxlives->integer ? 1 : 0));
Info_SetValueForKey(infostring, "needpass", va("%i", sv_needpass->integer ? 1 : 0));
Info_SetValueForKey(infostring, "gamename", GAMENAME_STRING);
antilag = Cvar_VariableString("g_antilag");
if (antilag)
{
Info_SetValueForKey(infostring, "g_antilag", antilag);
}
weaprestrict = Cvar_VariableString("g_heavyWeaponRestriction");
if (weaprestrict)
{
Info_SetValueForKey(infostring, "weaprestrict", weaprestrict);
}
balancedteams = Cvar_VariableString("g_balancedteams");
if (balancedteams)
{
Info_SetValueForKey(infostring, "balancedteams", balancedteams);
}
NET_OutOfBandPrint(NS_SERVER, from, "infoResponse\n%s", infostring);
}
/**
* @brief SV_FlushRedirect
* @param[in] outputbuf
*/
static void SV_FlushRedirect(char *outputbuf)
{
NET_OutOfBandPrint(NS_SERVER, svs.redirectAddress, "print\n%s", outputbuf);
}
/**
* @brief DRDoS stands for "Distributed Reflected Denial of Service".
* See here: http://www.lemuria.org/security/application-drdos.html
*
* If the address isn't NA_IP, it's automatically denied.
*
* @return qfalse if we're good.
* otherwise qtrue means we need to block.
*
* @note Don't call this if sv_protect 2 flag is not set!
*/
qboolean SV_CheckDRDoS(netadr_t from)
{
int i;
int globalCount;
int specificCount;
int timeNow;
receipt_t *receipt;
netadr_t exactFrom;
int oldest;
int oldestTime;
static int lastGlobalLogTime = 0;
static int lastSpecificLogTime = 0;
// Usually the network is smart enough to not allow incoming UDP packets
// with a source address being a spoofed LAN address. Even if that's not
// the case, sending packets to other hosts in the LAN is not a big deal.
// NA_LOOPBACK qualifies as a LAN address.
if (Sys_IsLANAddress(from))
{
return qfalse;
}
timeNow = svs.time;
exactFrom = from;
// Time has wrapped
if (lastGlobalLogTime > timeNow || lastSpecificLogTime > timeNow)
{
lastGlobalLogTime = 0;
lastSpecificLogTime = 0;
// just setting time to 1 (cannot be 0 as then globalCount would not be counted)
for (i = 0; i < MAX_INFO_RECEIPTS; i++)
{
if (svs.infoReceipts[i].time)
{
svs.infoReceipts[i].time = 1; // hack it so we count globalCount correctly