/*
==================
SV_CheckTimeouts
If a packet has not been received from a client for timeout->value
seconds, drop the conneciton. Server frames are used instead of
realtime to avoid dropping the local client while debugging.
When a client is normally dropped, the client_t goes into a zombie state
for a few seconds to make sure any final reliable message gets resent
if necessary
==================
*/
void SV_CheckTimeouts (void)
{
int32_t i;
client_t *cl;
int32_t droppoint;
int32_t zombiepoint;
droppoint = svs.realtime - 1000*timeout->value;
zombiepoint = svs.realtime - 1000*zombietime->value;
for (i=0,cl=svs.clients ; i<maxclients->value ; i++,cl++)
{
// message times may be wrong across a changelevel
if (cl->lastmessage > svs.realtime)
cl->lastmessage = svs.realtime;
if (cl->state == cs_zombie
&& cl->lastmessage < zombiepoint)
{
SV_CleanClient (cl); // r1ch fix: make sure client is cleaned up
cl->state = cs_free; // can now be reused
continue;
}
if ( (cl->state == cs_connected || cl->state == cs_spawned)
&& cl->lastmessage < droppoint)
{
// r1ch fix: only message if they spawned (less spam plz)
if (cl->state == cs_spawned && cl->name[0])
SV_BroadcastPrintf (PRINT_HIGH, "%s timed out\n", cl->name);
SV_DropClient (cl);
cl->state = cs_free; // don't bother with zombie state
}
}
}
/*
* ==================
* SVC_DirectConnect
*
* A connection request that did not come from the master
* ==================
*/
void SVC_DirectConnect(void)
{
char userinfo[MAX_INFO_STRING];
netadr_t adr;
int i;
client_t *cl, *newcl;
client_t temp;
edict_t *ent;
int edictnum;
int version;
int qport;
int challenge;
int previousclients; // rich: connection limit per IP
adr = net_from;
Com_DPrintf("SVC_DirectConnect ()\n");
version = atoi(Cmd_Argv(1));
if (version != PROTOCOL_VERSION)
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nServer is version %4.2f.\n", VERSION);
Com_DPrintf(" rejected connect from version %i\n", version);
return;
}
qport = atoi(Cmd_Argv(2));
challenge = atoi(Cmd_Argv(3));
// r1ch: limit connections from a single IP
previousclients = 0;
for (i = 0, cl = svs.clients; i < (int)maxclients->value; i++, cl++)
{
if (cl->state == cs_free)
{
continue;
}
if (NET_CompareBaseAdr(adr, cl->netchan.remote_address))
{
// r1ch: zombies are less dangerous
if (cl->state == cs_zombie)
{
previousclients++;
}
else
{
previousclients += 2;
}
}
}
if (previousclients >= (int)sv_iplimit->value * 2)
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nToo many connections from your host.\n");
Com_DPrintf(" too many connections\n");
return;
}
// end r1ch fix
strncpy(userinfo, Cmd_Argv(4), sizeof(userinfo) - 1);
userinfo[sizeof(userinfo) - 1] = 0;
// force the IP key/value pair so the game can filter based on ip
Info_SetValueForKey(userinfo, "ip", NET_AdrToString(net_from));
// attractloop servers are ONLY for local clients
if (sv.attractloop)
{
if (!NET_IsLocalAddress(adr))
{
Com_Printf("Remote connect in attract loop. Ignored.\n");
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nConnection refused.\n");
return;
}
}
// see if the challenge is valid
if (!NET_IsLocalAddress(adr))
{
for (i = 0; i < MAX_CHALLENGES; i++)
{
if (NET_CompareBaseAdr(net_from, svs.challenges[i].adr))
{
if (challenge == svs.challenges[i].challenge)
{
break; // good
}
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nBad challenge.\n");
return;
}
}
if (i == MAX_CHALLENGES)
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nNo challenge for address.\n");
return;
}
}
newcl = &temp;
memset(newcl, 0, sizeof(client_t));
// if there is already a slot for this ip, reuse it
for (i = 0, cl = svs.clients; i < maxclients->value; i++, cl++)
{
if (cl->state == 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) && ((svs.realtime - cl->lastconnect) < ((int)sv_reconnect_limit->value * 1000)))
{
Com_DPrintf("%s:reconnect rejected : too soon\n", NET_AdrToString(adr));
return;
}
// r1ch: !! fix nasty bug where non-disconnected clients (from dropped disconnect
// packets) could be overwritten!
if (cl->state != cs_zombie)
{
Com_DPrintf(" client already found\n");
// If we legitly get here, spoofed udp isn't possible (passed challenge) and client addr/port combo
// is exactly the same, so we can assume its really a dropped/crashed client. i hope...
Com_Printf("Dropping %s, ghost reconnect\n", cl->name);
SV_DropClient(cl);
}
// end r1ch fix
Com_Printf("%s:reconnect\n", NET_AdrToString(adr));
SV_CleanClient(cl); // r1ch: clean up last client data
newcl = cl;
goto gotnewcl;
}
}
// find a client slot
newcl = NULL;
for (i = 0, cl = svs.clients; i < maxclients->value; i++, cl++)
{
if (cl->state == cs_free)
{
newcl = cl;
break;
}
}
if (!newcl)
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nServer is full.\n");
Com_DPrintf("Rejected a connection.\n");
return;
}
gotnewcl:
// build a new connection
// accept the new client
// this is the only place a client_t is ever initialized
*newcl = temp;
sv_client = newcl;
edictnum = (newcl - svs.clients) + 1;
ent = EDICT_NUM(edictnum);
newcl->edict = ent;
newcl->challenge = challenge; // save challenge for checksumming
// get the game a chance to reject this connection or modify the userinfo
if (!(ge->ClientConnect(ent, userinfo)))
{
if (*Info_ValueForKey(userinfo, "rejmsg"))
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\n%s\nConnection refused.\n",
Info_ValueForKey(userinfo, "rejmsg"));
}
else
{
Netchan_OutOfBandPrint(NS_SERVER, adr, "print\nConnection refused.\n");
}
Com_DPrintf("Game rejected a connection.\n");
return;
}
// parse some info from the info strings
strncpy(newcl->userinfo, userinfo, sizeof(newcl->userinfo) - 1);
SV_UserinfoChanged(newcl);
// send the connect packet to the client
Netchan_OutOfBandPrint(NS_SERVER, adr, "client_connect");
Netchan_Setup(NS_SERVER, &newcl->netchan, adr, qport);
newcl->state = cs_connected;
SZ_Init(&newcl->datagram, newcl->datagram_buf, sizeof(newcl->datagram_buf));
newcl->datagram.allowoverflow = true;
newcl->lastmessage = svs.realtime; // don't timeout
newcl->lastconnect = svs.realtime;
}
