Xash3D FWGS engine.
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/*
netchan.h - net channel abstraction layer
Copyright (C) 2007 Uncle Mike
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 3 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.
*/
#ifndef NET_MSG_H
#define NET_MSG_H
/*
==========================================================
ELEMENTS COMMUNICATED ACROSS THE NET
==========================================================
*/
#include "crtlib.h"
#include "net_buffer.h"
// 0 == regular, 1 == file stream
#define MAX_STREAMS 2
// flow control bytes per second limits
#define MAX_RATE 100000.0f
#define MIN_RATE 1000.0f
// default data rate
#define DEFAULT_RATE (9999.0f)
// NETWORKING INFO
// This is the packet payload without any header bytes (which are attached for actual sending)
#define NET_MAX_PAYLOAD MAX_INIT_MSG
// Theoretically maximum size of UDP-packet without header and hardware-specific data
#define NET_MAX_FRAGMENT 65535
// because encoded as highpart of uint32
#define NET_MAX_BUFFER_ID 32767
// because encoded as lowpart of uint32
#define NET_MAX_BUFFERS_COUNT 32767
// This is the payload plus any header info (excluding UDP header)
// Packet header is:
// 4 bytes of outgoing seq
// 4 bytes of incoming seq
// and for each stream
// {
// byte (on/off)
// int (fragment id)
// int (startpos)
// int (length)
// }
#define HEADER_BYTES ( 8 + MAX_STREAMS * 13 )
// Pad this to next higher 16 byte boundary
// This is the largest packet that can come in/out over the wire, before processing the header
// bytes will be stripped by the networking channel layer
#define NET_MAX_MESSAGE PAD_NUMBER(( NET_MAX_PAYLOAD + HEADER_BYTES ), 16 )
#define MASTERSERVER_ADR "mentality.rip:27010"
#define MS_SCAN_REQUEST "1\xFF" "0.0.0.0:0\0"
#define PORT_MASTER 27010
#define PORT_SERVER 27015
#define MULTIPLAYER_BACKUP 64 // how many data slots to use when in multiplayer (must be power of 2)
#define SINGLEPLAYER_BACKUP 16 // same for single player
#define CMD_BACKUP 64 // allow a lot of command backups for very fast systems
#define CMD_MASK (CMD_BACKUP - 1)
#define NUM_PACKET_ENTITIES 256 // 170 Mb for multiplayer with 32 players
#define MAX_CUSTOM_BASELINES 64
#define NET_LEGACY_EXT_SPLIT (1U<<1)
#define NETSPLIT_BACKUP 8
#define NETSPLIT_BACKUP_MASK (NETSPLIT_BACKUP - 1)
#define NETSPLIT_HEADER_SIZE 18
#if XASH_LOW_MEMORY == 2
#undef MULTIPLAYER_BACKUP
#undef SINGLEPLAYER_BACKUP
#undef NUM_PACKET_ENTITIES
#undef MAX_CUSTOM_BASELINES
#undef NET_MAX_FRAGMENT
#define MULTIPLAYER_BACKUP 4 // breaks protocol in legacy mode, new protocol status unknown
#define SINGLEPLAYER_BACKUP 4
#define NUM_PACKET_ENTITIES 32
#define MAX_CUSTOM_BASELINES 8
#define NET_MAX_FRAGMENT 32768
#elif XASH_LOW_MEMORY == 1
#undef SINGLEPLAYER_BACKUP
#undef NUM_PACKET_ENTITIES
#undef MAX_CUSTOM_BASELINES
#undef NET_MAX_FRAGMENT
#define SINGLEPLAYER_BACKUP 4
#define NUM_PACKET_ENTITIES 64
#define MAX_CUSTOM_BASELINES 8
#define NET_MAX_FRAGMENT 32768
#endif
typedef struct netsplit_chain_packet_s
{
// bool vector
uint32_t recieved_v[8];
// serial number
uint32_t id;
byte data[NET_MAX_PAYLOAD];
byte received;
byte count;
} netsplit_chain_packet_t;
// raw packet format
typedef struct netsplit_packet_s
{
uint32_t signature; // 0xFFFFFFFE
uint32_t length;
uint32_t part;
uint32_t id;
// max 256 parts
byte count;
byte index;
byte data[NET_MAX_PAYLOAD - NETSPLIT_HEADER_SIZE];
} netsplit_packet_t;
typedef struct netsplit_s
{
netsplit_chain_packet_t packets[NETSPLIT_BACKUP];
uint64_t total_received;
uint64_t total_received_uncompressed;
} netsplit_t;
// packet splitting
qboolean NetSplit_GetLong( netsplit_t *ns, netadr_t *from, byte *data, size_t *length );
/*
==============================================================
NET
==============================================================
*/
#define MAX_FLOWS 2
#define FLOW_OUTGOING 0
#define FLOW_INCOMING 1
#define MAX_LATENT 32
#define MASK_LATENT ( MAX_LATENT - 1 )
#define FRAG_NORMAL_STREAM 0
#define FRAG_FILE_STREAM 1
// message data
typedef struct
{
int size; // size of message sent/received
double time; // time that message was sent/received
} flowstats_t;
typedef struct
{
flowstats_t stats[MAX_LATENT]; // data for last MAX_LATENT messages
int current; // current message position
double nextcompute; // time when we should recompute k/sec data
float kbytespersec; // average data
float avgkbytespersec;
int totalbytes;
} flow_t;
// generic fragment structure
typedef struct fragbuf_s
{
struct fragbuf_s *next; // next buffer in chain
int bufferid; // id of this buffer
sizebuf_t frag_message; // message buffer where raw data is stored
byte *frag_message_buf; // the actual data sits here
qboolean isfile; // is this a file buffer?
qboolean isbuffer; // is this file buffer from memory ( custom decal, etc. ).
qboolean iscompressed; // is compressed file, we should using filename.ztmp
char filename[MAX_OSPATH]; // name of the file to save out on remote host
int foffset; // offset in file from which to read data
int size; // size of data to read at that offset
} fragbuf_t;
// Waiting list of fragbuf chains
typedef struct fbufqueue_s
{
struct fbufqueue_s *next; // next chain in waiting list
int fragbufcount; // number of buffers in this chain
fragbuf_t *fragbufs; // the actual buffers
} fragbufwaiting_t;
typedef enum fragsize_e
{
FRAGSIZE_FRAG,
FRAGSIZE_SPLIT,
FRAGSIZE_UNRELIABLE
} fragsize_t;
// Network Connection Channel
typedef struct netchan_s
{
netsrc_t sock; // NS_SERVER or NS_CLIENT, depending on channel.
netadr_t remote_address; // address this channel is talking to.
int qport; // qport value to write when transmitting
double last_received; // for timeouts
double connect_time; // Usage: host.realtime - netchan.connect_time
double rate; // bandwidth choke. bytes per second
double cleartime; // if realtime > cleartime, free to send next packet
// Sequencing variables
unsigned int incoming_sequence; // increasing count of sequence numbers
unsigned int incoming_acknowledged; // # of last outgoing message that has been ack'd.
unsigned int incoming_reliable_acknowledged; // toggles T/F as reliable messages are received.
unsigned int incoming_reliable_sequence; // single bit, maintained local
unsigned int outgoing_sequence; // message we are sending to remote
unsigned int reliable_sequence; // whether the message contains reliable payload, single bit
unsigned int last_reliable_sequence; // outgoing sequence number of last send that had reliable data
// callback to get actual framgment size
void *client;
int (*pfnBlockSize)( void *cl, fragsize_t mode );
// staging and holding areas
sizebuf_t message;
byte message_buf[NET_MAX_MESSAGE];
// reliable message buffer.
// we keep adding to it until reliable is acknowledged. Then we clear it.
int reliable_length;
byte reliable_buf[NET_MAX_MESSAGE]; // unacked reliable message (max size for loopback connection)
// Waiting list of buffered fragments to go onto queue.
// Multiple outgoing buffers can be queued in succession
fragbufwaiting_t *waitlist[MAX_STREAMS];
int reliable_fragment[MAX_STREAMS]; // is reliable waiting buf a fragment?
uint reliable_fragid[MAX_STREAMS]; // buffer id for each waiting fragment
fragbuf_t *fragbufs[MAX_STREAMS]; // the current fragment being set
int fragbufcount[MAX_STREAMS]; // the total number of fragments in this stream
int frag_startpos[MAX_STREAMS]; // position in outgoing buffer where frag data starts
int frag_length[MAX_STREAMS]; // length of frag data in the buffer
fragbuf_t *incomingbufs[MAX_STREAMS]; // incoming fragments are stored here
qboolean incomingready[MAX_STREAMS]; // set to true when incoming data is ready
// Only referenced by the FRAG_FILE_STREAM component
char incomingfilename[MAX_OSPATH]; // Name of file being downloaded
void *tempbuffer; // download file buffer
int tempbuffersize; // current size
// incoming and outgoing flow metrics
flow_t flow[MAX_FLOWS];
// added for net_speeds
size_t total_sended;
size_t total_received;
qboolean split;
unsigned int maxpacket;
unsigned int splitid;
netsplit_t netsplit;
} netchan_t;
extern netadr_t net_from;
extern netadr_t net_local;
extern netadr_t net6_local;
extern sizebuf_t net_message;
extern byte net_message_buffer[NET_MAX_MESSAGE];
extern convar_t sv_lan;
extern convar_t sv_lan_rate;
extern int net_drop;
void Netchan_Init( void );
void Netchan_Shutdown( void );
void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport, void *client, int (*pfnBlockSize)(void *, fragsize_t mode ) );
void Netchan_CreateFileFragmentsFromBuffer( netchan_t *chan, const char *filename, byte *pbuf, int size );
qboolean Netchan_CopyNormalFragments( netchan_t *chan, sizebuf_t *msg, size_t *length );
qboolean Netchan_CopyFileFragments( netchan_t *chan, sizebuf_t *msg );
void Netchan_CreateFragments( netchan_t *chan, sizebuf_t *msg );
int Netchan_CreateFileFragments( netchan_t *chan, const char *filename );
void Netchan_TransmitBits( netchan_t *chan, int lengthInBits, byte *data );
void Netchan_OutOfBand( int net_socket, netadr_t adr, int length, byte *data );
void Netchan_OutOfBandPrint( int net_socket, netadr_t adr, const char *format, ... ) _format( 3 );
qboolean Netchan_Process( netchan_t *chan, sizebuf_t *msg );
void Netchan_UpdateProgress( netchan_t *chan );
qboolean Netchan_IncomingReady( netchan_t *chan );
qboolean Netchan_CanPacket( netchan_t *chan, qboolean choke );
qboolean Netchan_IsLocal( netchan_t *chan );
void Netchan_ReportFlow( netchan_t *chan );
void Netchan_FragSend( netchan_t *chan );
void Netchan_Clear( netchan_t *chan );
#endif//NET_MSG_H