sv_user.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

		|| !strstr (name, "/") )	
	{	// don't allow anything with .. path
		MSG_WriteByte (&sv_client->netchan.message, svc_download);
		MSG_WriteShort (&sv_client->netchan.message, -1);
		MSG_WriteByte (&sv_client->netchan.message, 0);
		return;
	}


	if (sv_client->download)
		FS_FreeFile (sv_client->download);

	sv_client->downloadsize = FS_LoadFile (name, (void **)&sv_client->download);
	sv_client->downloadcount = offset;

	if (offset > sv_client->downloadsize)
		sv_client->downloadcount = sv_client->downloadsize;

	if (!sv_client->download
		// special check for maps, if it came from a pak file, don't allow
		// download  ZOID
		|| (strncmp(name, "maps/", 5) == 0 && file_from_pak))
	{
		Com_DPrintf ("Couldn't download %s to %s\n", name, sv_client->name);
		if (sv_client->download) {
			FS_FreeFile (sv_client->download);
			sv_client->download = NULL;
		}

		MSG_WriteByte (&sv_client->netchan.message, svc_download);
		MSG_WriteShort (&sv_client->netchan.message, -1);
		MSG_WriteByte (&sv_client->netchan.message, 0);
		return;
	}

	SV_NextDownload_f ();
	Com_DPrintf ("Downloading %s to %s\n", name, sv_client->name);
}



//============================================================================


/*
=================
SV_Disconnect_f

The client is going to disconnect, so remove the connection immediately
=================
*/
void SV_Disconnect_f (void)
{
//	SV_EndRedirect ();
	SV_DropClient (sv_client);	
}


/*
==================
SV_ShowServerinfo_f

Dumps the serverinfo info string
==================
*/
void SV_ShowServerinfo_f (void)
{
	Info_Print (Cvar_Serverinfo());
}


void SV_Nextserver (void)
{
	char	*v;

	//ZOID, ss_pic can be nextserver'd in coop mode
	if (sv.state == ss_game || (sv.state == ss_pic && !Cvar_VariableValue("coop")))
		return;		// can't nextserver while playing a normal game

	svs.spawncount++;	// make sure another doesn't sneak in
	v = Cvar_VariableString ("nextserver");
	if (!v[0])
		Cbuf_AddText ("killserver\n");
	else
	{
		Cbuf_AddText (v);
		Cbuf_AddText ("\n");
	}
	Cvar_Set ("nextserver","");
}

/*
==================
SV_Nextserver_f

A cinematic has completed or been aborted by a client, so move
to the next server,
==================
*/
void SV_Nextserver_f (void)
{
	if ( atoi(Cmd_Argv(1)) != svs.spawncount ) {
		Com_DPrintf ("Nextserver() from wrong level, from %s\n", sv_client->name);
		return;		// leftover from last server
	}

	Com_DPrintf ("Nextserver() from %s\n", sv_client->name);

	SV_Nextserver ();
}

typedef struct
{
	char	*name;
	void	(*func) (void);
} ucmd_t;

ucmd_t ucmds[] =
{
	// auto issued
	{"new", SV_New_f},
	{"configstrings", SV_Configstrings_f},
	{"baselines", SV_Baselines_f},
	{"begin", SV_Begin_f},

	{"nextserver", SV_Nextserver_f},

	{"disconnect", SV_Disconnect_f},

	// issued by hand at client consoles	
	{"info", SV_ShowServerinfo_f},

	{"download", SV_BeginDownload_f},
	{"nextdl", SV_NextDownload_f},

	{NULL, NULL}
};

/*
==================
SV_ExecuteUserCommand
==================
*/
void SV_ExecuteUserCommand (char *s)
{
	ucmd_t	*u;
	
	Cmd_TokenizeString (s, true);
	sv_player = sv_client->edict;

//	SV_BeginRedirect (RD_CLIENT);

	for (u=ucmds ; u->name ; u++)
		if (!strcmp (Cmd_Argv(0), u->name) )
		{
			u->func ();
			break;
		}

	if (!u->name && sv.state == ss_game)
		ge->ClientCommand (sv_player);

//	SV_EndRedirect ();
}

/*
===========================================================================

USER CMD EXECUTION

===========================================================================
*/



void SV_ClientThink (client_t *cl, usercmd_t *cmd)

{
	cl->commandMsec -= cmd->msec;

	if (cl->commandMsec < 0 && sv_enforcetime->value )
	{
		Com_DPrintf ("commandMsec underflow from %s\n", cl->name);
		return;
	}

	ge->ClientThink (cl->edict, cmd);
}



#define	MAX_STRINGCMDS	8
/*
===================
SV_ExecuteClientMessage

The current net_message is parsed for the given client
===================
*/
void SV_ExecuteClientMessage (client_t *cl)
{
	int		c;
	char	*s;

	usercmd_t	nullcmd;
	usercmd_t	oldest, oldcmd, newcmd;
	int		net_drop;
	int		stringCmdCount;
	int		checksum, calculatedChecksum;
	int		checksumIndex;
	qboolean	move_issued;
	int		lastframe;

	sv_client = cl;
	sv_player = sv_client->edict;

	// only allow one move command
	move_issued = false;
	stringCmdCount = 0;

	while (1)
	{
		if (net_message.readcount > net_message.cursize)
		{
			Com_Printf ("SV_ReadClientMessage: badread\n");
			SV_DropClient (cl);
			return;
		}	

		c = MSG_ReadByte (&net_message);
		if (c == -1)
			break;
				
		switch (c)
		{
		default:
			Com_Printf ("SV_ReadClientMessage: unknown command char\n");
			SV_DropClient (cl);
			return;
						
		case clc_nop:
			break;

		case clc_userinfo:
			strncpy (cl->userinfo, MSG_ReadString (&net_message), sizeof(cl->userinfo)-1);
			SV_UserinfoChanged (cl);
			break;

		case clc_move:
			if (move_issued)
				return;		// someone is trying to cheat...

			move_issued = true;
			checksumIndex = net_message.readcount;
			checksum = MSG_ReadByte (&net_message);
			lastframe = MSG_ReadLong (&net_message);
			if (lastframe != cl->lastframe) {
				cl->lastframe = lastframe;
				if (cl->lastframe > 0) {
					cl->frame_latency[cl->lastframe&(LATENCY_COUNTS-1)] = 
						svs.realtime - cl->frames[cl->lastframe & UPDATE_MASK].senttime;
				}
			}

			memset (&nullcmd, 0, sizeof(nullcmd));
			MSG_ReadDeltaUsercmd (&net_message, &nullcmd, &oldest);
			MSG_ReadDeltaUsercmd (&net_message, &oldest, &oldcmd);
			MSG_ReadDeltaUsercmd (&net_message, &oldcmd, &newcmd);

			if ( cl->state != cs_spawned )
			{
				cl->lastframe = -1;
				break;
			}

			// if the checksum fails, ignore the rest of the packet
			calculatedChecksum = COM_BlockSequenceCRCByte (
				net_message.data + checksumIndex + 1,
				net_message.readcount - checksumIndex - 1,
				cl->netchan.incoming_sequence);

			if (calculatedChecksum != checksum)
			{
				Com_DPrintf ("Failed command checksum for %s (%d != %d)/%d\n", 
					cl->name, calculatedChecksum, checksum, 
					cl->netchan.incoming_sequence);
				return;
			}

			if (!sv_paused->value)
			{
				net_drop = cl->netchan.dropped;
				if (net_drop < 20)
				{

//if (net_drop > 2)

//	Com_Printf ("drop %i\n", net_drop);
					while (net_drop > 2)
					{
						SV_ClientThink (cl, &cl->lastcmd);

						net_drop--;
					}
					if (net_drop > 1)
						SV_ClientThink (cl, &oldest);

					if (net_drop > 0)
						SV_ClientThink (cl, &oldcmd);

				}
				SV_ClientThink (cl, &newcmd);
			}

			cl->lastcmd = newcmd;
			break;

		case clc_stringcmd:	
			s = MSG_ReadString (&net_message);

			// malicious users may try using too many string commands
			if (++stringCmdCount < MAX_STRINGCMDS)
				SV_ExecuteUserCommand (s);

			if (cl->state == cs_zombie)
				return;	// disconnect command
			break;
		}
	}
}