quakeforge/include/netchan.h

/*
	netchan.h

	quake's interface to the networking layer

	Copyright (C) 1996-1997  Id Software, Inc.

	This program 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 2
	of the License, or (at your option) any later version.

	This program 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 this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifndef _NET_H
#define _NET_H

#include "QF/cvar.h"
#include "QF/msg.h"
#include "QF/qdefs.h"
#include "QF/sizebuf.h"

#define MAX_MSGLEN		1450		// max length of a reliable message
#define MAX_DATAGRAM	1450		// max length of unreliable message

#define	PORT_ANY	-1

typedef struct
{
#ifdef HAVE_IPV6
	byte	ip[16];
#else
	byte	ip[4];
#endif
	unsigned short	port;
	unsigned short	family;	// used to be pad, before IPV6
} netadr_t;

extern	netadr_t	net_local_adr;
extern	netadr_t	net_loopback_adr;
extern	netadr_t	net_from;		// address of who sent the packet
extern	struct msg_s *net_message;

extern	struct cvar_s	*hostname;
extern	struct cvar_s	*qport;

extern	int		net_socket;

void		NET_Init (int port);
void		NET_Init (int port);
void		NET_Shutdown (void);
qboolean	NET_GetPacket (void);
void		NET_SendPacket (int length, void *data, netadr_t to);

qboolean	NET_CompareAdr (netadr_t a, netadr_t b);
qboolean	NET_CompareBaseAdr (netadr_t a, netadr_t b);
const char	*NET_AdrToString (netadr_t a);
const char	*NET_BaseAdrToString (netadr_t a);
qboolean	NET_StringToAdr (const char *s, netadr_t *a);
qboolean NET_IsClientLegal(netadr_t *adr);


int Net_Log_Init (const char **sound_precache);
void Log_Incoming_Packet (const char *p, int len, int has_sequence);
void Log_Outgoing_Packet (const char *p, int len, int has_sequence);
void Net_LogStop (void);
void Analyze_Client_Packet (const byte * data, int len, int has_sequence);
void Analyze_Server_Packet (const byte * data, int len, int has_sequence);

extern struct cvar_s *net_packetlog;

extern qboolean is_server;
qboolean ServerPaused (void);

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

#define	OLD_AVG		0.99		// total = oldtotal*OLD_AVG + new*(1-OLD_AVG)

#define	MAX_LATENT	32

typedef struct netchan_s {
	qboolean	fatal_error;

	float		last_received;		// for timeouts

// the statistics are cleared at each client begin, because
// the server connecting process gives a bogus picture of the data
	float		frame_latency;		// rolling average
	float		frame_rate;

	int			drop_count;			// dropped packets, cleared each level
	int			good_count;			// cleared each level

	netadr_t	remote_address;
	int			qport;
	int			flags;

// bandwidth estimator
	double		cleartime;			// if realtime > nc->cleartime, free to go
	double		rate;				// seconds / byte

// sequencing variables
	int			incoming_sequence;
	int			incoming_acknowledged;
	int			incoming_reliable_acknowledged;	// single bit

	int			incoming_reliable_sequence;		// single bit, maintained local

	int			outgoing_sequence;
	int			reliable_sequence;			// single bit
	int			last_reliable_sequence;		// sequence number of last send

// reliable staging and holding areas
	sizebuf_t	message;		// writing buffer to send to server
	byte		message_buf[MAX_MSGLEN];

	int			reliable_length;
	byte		reliable_buf[MAX_MSGLEN];	// unacked reliable message

// time and size data to calculate bandwidth
	int			outgoing_size[MAX_LATENT];
	double		outgoing_time[MAX_LATENT];
} netchan_t;

extern	int	net_drop;		// packets dropped before this one
extern	int net_nochoke;	// don't choke packets
extern	int net_blocksend;	// don't send packets (used by client for demos)
extern	double *net_realtime;

void Netchan_Init (void);
void Netchan_Init_Cvars (void);
void Netchan_Transmit (netchan_t *chan, int length, byte *data);
void Netchan_OutOfBand (netadr_t adr, int length, byte *data);
void Netchan_OutOfBandPrint (netadr_t adr, const char *format, ...) __attribute__((format(printf,2,3)));
qboolean Netchan_Process (netchan_t *chan);
void Netchan_Setup (netchan_t *chan, netadr_t adr, int qport, int flags);

#define NC_SEND_QPORT	0x01
#define NC_READ_QPORT	0x02

qboolean Netchan_CanPacket (netchan_t *chan);
qboolean Netchan_CanReliable (netchan_t *chan);

static inline void
Netchan_SendPacket (int length, void *data, netadr_t to)
{
#if 0
	if (net_packetlog->int_val)
		Log_Outgoing_Packet(data, length, 1);
#endif
	NET_SendPacket (length, data, to);
}

#endif // _NET_H