Esempio n. 1
0
/*
=====================
CL_ParseServerMessage
=====================
*/
void CL_ParseServerMessage( msg_t *msg )
{
	int cmd;
//	msg_t           msgback;

//	msgback = *msg;

	if ( cl_shownet->integer == 1 )
	{
		Com_Printf("%i ", msg->cursize );
	}
	else if ( cl_shownet->integer >= 2 )
	{
		Com_Printf( "------------------\n" );
	}

	MSG_Bitstream( msg );

	// get the reliable sequence acknowledge number
	clc.reliableAcknowledge = MSG_ReadLong( msg );

	//
	if ( clc.reliableAcknowledge < clc.reliableSequence - MAX_RELIABLE_COMMANDS )
	{
		clc.reliableAcknowledge = clc.reliableSequence;
	}

	//
	// parse the message
	//
	while ( 1 )
	{
		if ( msg->readcount > msg->cursize )
		{
			Com_Error( ERR_DROP, "CL_ParseServerMessage: read past end of server message" );
		}

		cmd = MSG_ReadByte( msg );

		// See if this is an extension command after the EOF, which means we
		//  got data that a legacy client should ignore.
		if ( ( cmd == svc_EOF ) && ( MSG_LookaheadByte( msg ) == svc_extension ) )
		{
			SHOWNET( msg, "EXTENSION" );
			MSG_ReadByte( msg );  // throw the svc_extension byte away.
			cmd = MSG_ReadByte( msg );  // something legacy clients can't do!

			// sometimes you get a svc_extension at end of stream...dangling
			//  bits in the huffman decoder giving a bogus value?
			if ( cmd == -1 )
			{
				cmd = svc_EOF;
			}
		}

		if ( cmd == svc_EOF )
		{
			SHOWNET( msg, "END OF MESSAGE" );
			break;
		}

		if ( cl_shownet->integer >= 2 )
		{
			if ( !svc_strings[ cmd ] )
			{
				Com_Printf( "%3i:BAD CMD %i\n", msg->readcount - 1, cmd );
			}
			else
			{
				SHOWNET( msg, svc_strings[ cmd ] );
			}
		}

		// other commands
		switch ( cmd )
		{
			default:
				Com_Error( ERR_DROP, "CL_ParseServerMessage: Illegible server message %d", cmd );

			case svc_nop:
				break;

			case svc_serverCommand:
				CL_ParseCommandString( msg );
				break;

			case svc_gamestate:
				CL_ParseGamestate( msg );
				break;

			case svc_snapshot:
				CL_ParseSnapshot( msg );
				break;

			case svc_download:
				CL_ParseDownload( msg );
				break;

			case svc_voip:
#ifdef USE_VOIP
				CL_ParseVoip( msg );
#endif
				break;
		}
	}

}
Esempio n. 2
0
/*
===================
SV_ExecuteClientMessage

Parse a client packet
===================
*/
void SV_ExecuteClientMessage( client_t *cl, msg_t *msg ) {
	int			c;
	int			serverId;

	MSG_Bitstream(msg);

	serverId = MSG_ReadLong( msg );
	cl->messageAcknowledge = MSG_ReadLong( msg );

	if (cl->messageAcknowledge < 0) {
		// usually only hackers create messages like this
		// it is more annoying for them to let them hanging
#ifndef NDEBUG
		SV_DropClient( cl, "DEBUG: illegible client message" );
#endif
		return;
	}

	cl->reliableAcknowledge = MSG_ReadLong( msg );

	// NOTE: when the client message is fux0red the acknowledgement numbers
	// can be out of range, this could cause the server to send thousands of server
	// commands which the server thinks are not yet acknowledged in SV_UpdateServerCommandsToClient
	if (cl->reliableAcknowledge < cl->reliableSequence - MAX_RELIABLE_COMMANDS) {
		// usually only hackers create messages like this
		// it is more annoying for them to let them hanging
#ifndef NDEBUG
		SV_DropClient( cl, "DEBUG: illegible client message" );
#endif
		cl->reliableAcknowledge = cl->reliableSequence;
		return;
	}
	// if this is a usercmd from a previous gamestate,
	// ignore it or retransmit the current gamestate
	// 
	// if the client was downloading, let it stay at whatever serverId and
	// gamestate it was at.  This allows it to keep downloading even when
	// the gamestate changes.  After the download is finished, we'll
	// notice and send it a new game state
	//
	// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=536
	// don't drop as long as previous command was a nextdl, after a dl is done, downloadName is set back to ""
	// but we still need to read the next message to move to next download or send gamestate
	// I don't like this hack though, it must have been working fine at some point, suspecting the fix is somewhere else
	if ( serverId != sv.serverId && !*cl->downloadName && !strstr(cl->lastClientCommandString, "nextdl") ) {
		if ( serverId >= sv.restartedServerId && serverId < sv.serverId ) { // TTimo - use a comparison here to catch multiple map_restart
			// they just haven't caught the map_restart yet
			Com_DPrintf("%s : ignoring pre map_restart / outdated client message\n", cl->name);
			return;
		}
		// if we can tell that the client has dropped the last
		// gamestate we sent them, resend it
		if ( cl->messageAcknowledge > cl->gamestateMessageNum ) {
			Com_DPrintf( "%s : dropped gamestate, resending\n", cl->name );
			SV_SendClientGameState( cl );
		}
		return;
	}

	// this client has acknowledged the new gamestate so it's
	// safe to start sending it the real time again
	if( cl->oldServerTime && serverId == sv.serverId ){
		Com_DPrintf( "%s acknowledged gamestate\n", cl->name );
		cl->oldServerTime = 0;
	}

	// read optional clientCommand strings
	do {
		c = MSG_ReadByte( msg );

		// See if this is an extension command after the EOF, which means we
		//  got data that a legacy server should ignore.
		if ((c == clc_EOF) && (MSG_LookaheadByte( msg ) == clc_extension)) {
			MSG_ReadByte( msg );  // throw the clc_extension byte away.
			c = MSG_ReadByte( msg );  // something legacy servers can't do!
			// sometimes you get a clc_extension at end of stream...dangling
			//  bits in the huffman decoder giving a bogus value?
			if (c == -1) {
				c = clc_EOF;
			}
		}

		if ( c == clc_EOF ) {
			break;
		}

		if ( c != clc_clientCommand ) {
			break;
		}
		if ( !SV_ClientCommand( cl, msg ) ) {
			return;	// we couldn't execute it because of the flood protection
		}
		if (cl->state == CS_ZOMBIE) {
			return;	// disconnect command
		}
	} while ( 1 );

	// read the usercmd_t
	if ( c == clc_move ) {
		SV_UserMove( cl, msg, qtrue );
	} else if ( c == clc_moveNoDelta ) {
		SV_UserMove( cl, msg, qfalse );
	} else if ( c == clc_voip ) {
#ifdef USE_VOIP
		SV_UserVoip( cl, msg );
#endif
	} else if ( c != clc_EOF ) {
		Com_Printf( "WARNING: bad command byte for client %i\n", (int) (cl - svs.clients) );
	}
//	if ( msg->readcount != msg->cursize ) {
//		Com_Printf( "WARNING: Junk at end of packet for client %i\n", cl - svs.clients );
//	}
}