public static void SVC_GetChallenge( )
{
Int32 i;
Int32 oldest;
Int32 oldestTime;
oldest = 0;
oldestTime = 0x7fffffff;
for (i = 0; i < Defines.MAX_CHALLENGES; i++)
{
if (NET.CompareBaseAdr(Globals.net_from, SV_INIT.svs.challenges[i].adr))
{
break;
}
if (SV_INIT.svs.challenges[i].time < oldestTime)
{
oldestTime = SV_INIT.svs.challenges[i].time;
oldest = i;
}
}
if (i == Defines.MAX_CHALLENGES)
{
SV_INIT.svs.challenges[oldest].challenge = Lib.Rand() & 0x7fff;
SV_INIT.svs.challenges[oldest].adr = Globals.net_from;
SV_INIT.svs.challenges[oldest].time = ( Int32 )Globals.curtime;
i = oldest;
}
Netchan.OutOfBandPrint(Defines.NS_SERVER, Globals.net_from, "challenge " + SV_INIT.svs.challenges[i].challenge);
}
public static void SV_ReadPackets( )
{
Int32 i;
client_t cl;
var qport = 0;
while (NET.GetPacket(Defines.NS_SERVER, Globals.net_from, Globals.net_message))
{
if ((Globals.net_message.data[0] == -1) && (Globals.net_message.data[1] == -1) && (Globals.net_message.data[2] == -1) && (Globals.net_message.data[3] == -1))
{
SV_ConnectionlessPacket();
continue;
}
MSG.BeginReading(Globals.net_message);
MSG.ReadLong(Globals.net_message);
MSG.ReadLong(Globals.net_message);
qport = MSG.ReadShort(Globals.net_message) & 0xffff;
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
continue;
}
if (!NET.CompareBaseAdr(Globals.net_from, cl.netchan.remote_address))
{
continue;
}
if (cl.netchan.qport != qport)
{
continue;
}
if (cl.netchan.remote_address.port != Globals.net_from.port)
{
Com.Printf("SV_ReadPackets: fixing up a translated port\\n");
cl.netchan.remote_address.port = Globals.net_from.port;
}
if (Netchan.Process(cl.netchan, Globals.net_message))
{
if (cl.state != Defines.cs_zombie)
{
cl.lastmessage = SV_INIT.svs.realtime;
SV_USER.SV_ExecuteClientMessage(cl);
}
}
break;
}
if (i != SV_MAIN.maxclients.value)
{
continue;
}
}
}
/**
* Returns a challenge number that can be used in a subsequent
* client_connect command. We do this to prevent denial of service attacks
* that flood the server with invalid connection IPs. With a challenge, they
* must give a valid IP address.
*/
public static void SVC_GetChallenge()
{
int i;
int oldest;
int oldestTime;
oldest = 0;
oldestTime = 0x7fffffff;
// see if we already have a challenge for this ip
for (i = 0; i < Defines.MAX_CHALLENGES; i++)
{
if (NET.CompareBaseAdr(Globals.net_from, SV_INIT.svs.challenges[i].adr))
{
break;
}
if (SV_INIT.svs.challenges[i].time < oldestTime)
{
oldestTime = SV_INIT.svs.challenges[i].time;
oldest = i;
}
}
if (i == Defines.MAX_CHALLENGES)
{
// overwrite the oldest
SV_INIT.svs.challenges[oldest].challenge = Lib.rand() & 0x7fff;
SV_INIT.svs.challenges[oldest].adr = Globals.net_from;
SV_INIT.svs.challenges[oldest].time = (int)Globals.curtime;
i = oldest;
}
// send it back
Netchan.OutOfBandPrint(Defines.NS_SERVER, Globals.net_from, "challenge " + SV_INIT.svs.challenges[i].challenge);
}
public static void SVC_DirectConnect( )
{
String userinfo;
netadr_t adr;
Int32 i;
client_t cl;
Int32 version;
Int32 qport;
adr = Globals.net_from;
Com.DPrintf("SVC_DirectConnect ()\\n");
version = Lib.Atoi(Cmd.Argv(1));
if (version != Defines.PROTOCOL_VERSION)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\\nServer is version " + Globals.VERSION + "\\n");
Com.DPrintf(" rejected connect from version " + version + "\\n");
return;
}
qport = Lib.Atoi(Cmd.Argv(2));
var challenge = Lib.Atoi(Cmd.Argv(3));
userinfo = Cmd.Argv(4);
userinfo = Info.Info_SetValueForKey(userinfo, "ip", NET.AdrToString(Globals.net_from));
if (SV_INIT.sv.attractloop)
{
if (!NET.IsLocalAddress(adr))
{
Com.Printf("Remote connect in attract loop. Ignored.\\n");
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\\nConnection refused.\\n");
return;
}
}
if (!NET.IsLocalAddress(adr))
{
for (i = 0; i < Defines.MAX_CHALLENGES; i++)
{
if (NET.CompareBaseAdr(Globals.net_from, SV_INIT.svs.challenges[i].adr))
{
if (challenge == SV_INIT.svs.challenges[i].challenge)
{
break;
}
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\\nBad challenge.\\n");
return;
}
}
if (i == Defines.MAX_CHALLENGES)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\\nNo challenge for address.\\n");
return;
}
}
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
continue;
}
if (NET.CompareBaseAdr(adr, cl.netchan.remote_address) && (cl.netchan.qport == qport || adr.port == cl.netchan.remote_address.port))
{
if (!NET.IsLocalAddress(adr) && (SV_INIT.svs.realtime - cl.lastconnect) < (( Int32 )SV_MAIN.sv_reconnect_limit.value * 1000))
{
Com.DPrintf(NET.AdrToString(adr) + ":reconnect rejected : too soon\\n");
return;
}
Com.Printf(NET.AdrToString(adr) + ":reconnect\\n");
Gotnewcl(i, challenge, userinfo, adr, qport);
return;
}
}
var index = -1;
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
index = i;
break;
}
}
if (index == -1)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\\nServer is full.\\n");
Com.DPrintf("Rejected a connection.\\n");
return;
}
Gotnewcl(index, challenge, userinfo, adr, qport);
}
/**
* Reads packets from the network or loopback.
*/
public static void SV_ReadPackets()
{
int i;
client_t cl;
var qport = 0;
while (NET.GetPacket(Defines.NS_SERVER, Globals.net_from, Globals.net_message))
{
// check for connectionless packet (0xffffffff) first
if (Globals.net_message.data[0] == 255 &&
Globals.net_message.data[1] == 255 &&
Globals.net_message.data[2] == 255 &&
Globals.net_message.data[3] == 255)
{
SV_MAIN.SV_ConnectionlessPacket();
continue;
}
// read the qport out of the message so we can fix up
// stupid address translating routers
MSG.BeginReading(Globals.net_message);
MSG.ReadLong(Globals.net_message); // sequence number
MSG.ReadLong(Globals.net_message); // sequence number
qport = MSG.ReadShort(Globals.net_message) & 0xffff;
// check for packets from connected clients
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
continue;
}
if (!NET.CompareBaseAdr(Globals.net_from, cl.netchan.remote_address))
{
continue;
}
if (cl.netchan.qport != qport)
{
continue;
}
if (cl.netchan.remote_address.port != Globals.net_from.port)
{
Com.Printf("SV_ReadPackets: fixing up a translated port\n");
cl.netchan.remote_address.port = Globals.net_from.port;
}
if (Netchan.Process(cl.netchan, Globals.net_message))
{
// this is a valid, sequenced packet, so process it
if (cl.state != Defines.cs_zombie)
{
cl.lastmessage = SV_INIT.svs.realtime; // don't timeout
SV_USER.SV_ExecuteClientMessage(cl);
}
}
break;
}
if (i != SV_MAIN.maxclients.value)
{
continue;
}
}
}
/**
* A connection request that did not come from the master.
*/
public static void SVC_DirectConnect()
{
string userinfo;
netadr_t adr;
int i;
client_t cl;
int version;
int qport;
adr = Globals.net_from;
Com.DPrintf("SVC_DirectConnect ()\n");
version = Lib.atoi(Cmd.Argv(1));
if (version != Defines.PROTOCOL_VERSION)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\nServer is version " + Globals.VERSION + "\n");
Com.DPrintf(" rejected connect from version " + version + "\n");
return;
}
qport = Lib.atoi(Cmd.Argv(2));
var challenge = Lib.atoi(Cmd.Argv(3));
userinfo = Cmd.Argv(4);
// force the IP key/value pair so the game can filter based on ip
userinfo = Info.Info_SetValueForKey(userinfo, "ip", NET.AdrToString(Globals.net_from));
// attractloop servers are ONLY for local clients
if (SV_INIT.sv.attractloop)
{
if (!NET.IsLocalAddress(adr))
{
Com.Printf("Remote connect in attract loop. Ignored.\n");
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\nConnection refused.\n");
return;
}
}
// see if the challenge is valid
if (!NET.IsLocalAddress(adr))
{
for (i = 0; i < Defines.MAX_CHALLENGES; i++)
{
if (NET.CompareBaseAdr(Globals.net_from, SV_INIT.svs.challenges[i].adr))
{
if (challenge == SV_INIT.svs.challenges[i].challenge)
{
break; // good
}
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\nBad challenge.\n");
return;
}
}
if (i == Defines.MAX_CHALLENGES)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\nNo challenge for address.\n");
return;
}
}
// if there is already a slot for this ip, reuse it
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
continue;
}
if (NET.CompareBaseAdr(adr, cl.netchan.remote_address) && (cl.netchan.qport == qport || adr.port == cl.netchan.remote_address.port))
{
if (!NET.IsLocalAddress(adr) && SV_INIT.svs.realtime - cl.lastconnect < (int)SV_MAIN.sv_reconnect_limit.value * 1000)
{
Com.DPrintf(NET.AdrToString(adr) + ":reconnect rejected : too soon\n");
return;
}
Com.Printf(NET.AdrToString(adr) + ":reconnect\n");
SV_MAIN.gotnewcl(i, challenge, userinfo, adr, qport);
return;
}
}
// find a client slot
//newcl = null;
var index = -1;
for (i = 0; i < SV_MAIN.maxclients.value; i++)
{
cl = SV_INIT.svs.clients[i];
if (cl.state == Defines.cs_free)
{
index = i;
break;
}
}
if (index == -1)
{
Netchan.OutOfBandPrint(Defines.NS_SERVER, adr, "print\nServer is full.\n");
Com.DPrintf("Rejected a connection.\n");
return;
}
SV_MAIN.gotnewcl(index, challenge, userinfo, adr, qport);
}