mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-15 09:21:33 +00:00
dbd3d6502a
I never liked it, but with C2x coming out, it's best to handle bools properly. I haven't gone through all the uses of int as bool (I'll leave that for fixing when I encounter them), but this gets QF working with both c2x (really, gnu2x because of raw strings).
384 lines
11 KiB
C
384 lines
11 KiB
C
/*
|
|
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
|
|
|
|
*/
|
|
|
|
#ifndef _NET_H
|
|
#define _NET_H
|
|
|
|
#include "QF/cvar.h"
|
|
#include "QF/msg.h"
|
|
#include "QF/qdefs.h"
|
|
#include "QF/sizebuf.h"
|
|
|
|
/** \defgroup network Network support
|
|
*/
|
|
|
|
/** \defgroup qw-net QuakeWorld network support.
|
|
\ingroup network
|
|
*/
|
|
///@{
|
|
#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;
|
|
} netadr_t;
|
|
|
|
extern int net_socket;
|
|
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 int qport;
|
|
|
|
int Net_Log_Init (const char **sound_precache, int server);
|
|
void Net_LogPrintf (const char *fmt, ...) __attribute__ ((format (PRINTF, 1, 2)));
|
|
void Log_Incoming_Packet (const byte *p, int len, int has_sequence);
|
|
void Log_Outgoing_Packet (const byte *p, int len, int has_sequence);
|
|
void Net_LogStop (void *data);
|
|
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 int net_packetlog;
|
|
///@}
|
|
|
|
/** \defgroup qw-udp QuakeWorld udp support.
|
|
\ingroup qw-net
|
|
*/
|
|
///@{
|
|
|
|
/** Initialize the UDP network interface.
|
|
|
|
Opens a single socket to be used for all communications.
|
|
|
|
\param port The port to which the socket will be bound.
|
|
*/
|
|
void NET_Init (int port);
|
|
|
|
/** Read a single packet from the network into net_message.
|
|
|
|
\return True if successfully read, otherwise false.
|
|
*/
|
|
bool NET_GetPacket (void);
|
|
|
|
/** Send a data packet out to the network.
|
|
|
|
\param length The length of the data to be sent.
|
|
\param data The data to be sent.
|
|
\param to The address to which the data will be sent.
|
|
*/
|
|
void NET_SendPacket (int length, const void *data, netadr_t to);
|
|
|
|
/** Compare two network addresses.
|
|
|
|
Compare the port number too.
|
|
|
|
\param a The first address to compare.
|
|
\param b The second address to compare.
|
|
\return True of the addresses match, otherwise false.
|
|
*/
|
|
bool NET_CompareAdr (netadr_t a, netadr_t b) __attribute__((const));
|
|
|
|
/** Compare two network addresses.
|
|
|
|
Ignore the port number.
|
|
|
|
\param a The first address to compare.
|
|
\param b The second address to compare.
|
|
\return True of the addresses match, otherwise false.
|
|
*/
|
|
bool NET_CompareBaseAdr (netadr_t a, netadr_t b) __attribute__((const));
|
|
|
|
/** Convert an address to a string.
|
|
|
|
Include the port number in the string.
|
|
|
|
\warning The return value is a pointer to a static buffer. The returned
|
|
string must be saved if mixing calls with different addresses.
|
|
|
|
\param a The address to convert
|
|
\return The address in human readable form.
|
|
*/
|
|
const char *NET_AdrToString (netadr_t a);
|
|
|
|
/** Convert an address to a string.
|
|
|
|
Do not include the port number in the string.
|
|
|
|
\warning The return value is a pointer to a static buffer. The returned
|
|
string must be saved if mixing calls with different addresses.
|
|
|
|
\param a The address to convert
|
|
\return The address in human readable form.
|
|
*/
|
|
const char *NET_BaseAdrToString (netadr_t a);
|
|
|
|
/** Convert a human readable address to a quake address.
|
|
|
|
Accepts both host names (full or partial) and numeric form.
|
|
|
|
If a port is specified, the port value in the address will be set to that
|
|
value, otherwise it will be set to 0.
|
|
|
|
\param[in] s The human readable address to be converted.
|
|
\param[out] a The resulting address of the conversion.
|
|
\return True if the conversion is successful, otherwise false.
|
|
*/
|
|
bool NET_StringToAdr (const char *s, netadr_t *a);
|
|
|
|
///@}
|
|
|
|
/** \defgroup netchan Netchan
|
|
\ingroup qw-net
|
|
|
|
<table>
|
|
<tr><td colspan=2>Packet Header</td></tr>
|
|
<tr><td>Bits</td> <td>Meaning</td></tr>
|
|
<tr><td>31</td> <td>sequence</td></tr>
|
|
<tr><td>1</td> <td>this message contains a reliable payload</td></tr>
|
|
<tr><td>31</td> <td>acknowledge sequence</td></tr>
|
|
<tr><td>1</td> <td>acknowledge receipt of even/odd message</td></tr>
|
|
<tr><td>16</td> <td>qport</td></tr>
|
|
</table>
|
|
|
|
The remote connection never knows if it missed a reliable message, the
|
|
local side detects that it has been dropped by seeing a sequence
|
|
acknowledge higher than the last reliable sequence, but without the
|
|
correct even/odd bit for the reliable set.
|
|
|
|
If the sender notices that a reliable message has been dropped, it will
|
|
be retransmitted. It will not be retransmitted again until a message
|
|
after the retransmit has been acknowledged and the reliable still failed
|
|
to get there.
|
|
|
|
If the sequence number and reliable payload bits are all 1 (32bit -1),
|
|
the packet is an out-of-band packet and should be handled without a
|
|
netcon.
|
|
|
|
The reliable message can be added to at any time by doing
|
|
MSG_Write* (&netchan->message, data).
|
|
|
|
If the message buffer is overflowed, either by a single message, or by
|
|
multiple frames worth piling up while the last reliable transmit goes
|
|
unacknowledged, the netchan signals a fatal error.
|
|
|
|
Reliable messages are always placed first in a packet, then the unreliable
|
|
message is included if there is sufficient room.
|
|
|
|
To the receiver, there is no distinction between the reliable and
|
|
unreliable parts of the message, they are just processed out as a single
|
|
larger message.
|
|
|
|
Illogical packet sequence numbers cause the packet to be dropped, but do
|
|
not kill the connection. This, combined with the tight window of valid
|
|
reliable acknowledgement numbers provides protection against malicious
|
|
address spoofing.
|
|
|
|
The qport field is a workaround for bad address translating routers that
|
|
sometimes remap the client's source port on a packet during gameplay.
|
|
|
|
If the base part of the net address matches and the qport matches, then
|
|
the channel matches even if the IP port differs. The IP port should be
|
|
updated to the new value before sending out any replies.
|
|
*/
|
|
///@{
|
|
#define OLD_AVG 0.99 // total = oldtotal*OLD_AVG + new*(1-OLD_AVG)
|
|
|
|
#define MAX_LATENT 32
|
|
|
|
typedef enum {
|
|
NC_QPORT_SEND = 0x01,
|
|
NC_QPORT_READ = 0x02,
|
|
} ncqport_e;
|
|
|
|
typedef struct netchan_s {
|
|
bool fatal_error; ///< True if the message overflowed
|
|
|
|
double last_received; ///< Time the last packet was received.
|
|
|
|
/// \name statistics
|
|
/// the statistics are cleared at each client begin, because
|
|
/// the server connection 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 net_drop; ///< packets dropped before this one
|
|
int good_count; ///< cleared each level
|
|
///@}
|
|
|
|
netadr_t remote_address;
|
|
int qport;
|
|
ncqport_e flags;
|
|
|
|
/// \name bandwidth estimator
|
|
///@{
|
|
double cleartime; ///< if realtime > nc->cleartime,
|
|
///< free to go
|
|
double rate; ///< seconds / byte
|
|
///@}
|
|
|
|
/// \name 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
|
|
///@}
|
|
|
|
/// \name 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
|
|
///@}
|
|
|
|
/// \name time and size data to calculate bandwidth
|
|
///@{
|
|
int outgoing_size[MAX_LATENT];
|
|
double outgoing_time[MAX_LATENT];
|
|
///@}
|
|
} netchan_t;
|
|
|
|
/** Disable packet choking.
|
|
*/
|
|
extern int net_nochoke;
|
|
|
|
/** Disable packet sending.
|
|
|
|
Used by clients in demo playback mode.
|
|
*/
|
|
extern int net_blocksend;
|
|
|
|
/** Pointer to variable holding the current time in seconds.
|
|
*/
|
|
extern double *net_realtime;
|
|
|
|
/** Callback to log outgoing packets
|
|
*/
|
|
extern void (*net_log_packet) (int length, const void *data, netadr_t to);
|
|
|
|
/** Initialize the netchan system.
|
|
|
|
Currently only sets the qport cvar default to a random value.
|
|
*/
|
|
void Netchan_Init (void);
|
|
|
|
/** Initialize the netchan cvars.
|
|
*/
|
|
void Netchan_Init_Cvars (void);
|
|
|
|
/** Try to send an unreliable packet to a connection.
|
|
|
|
Handles transmission or retransmission of the reliable packet.
|
|
|
|
0 length will still generate a packet and deal with the reliable messages.
|
|
|
|
\param chan The netchan representing the connection.
|
|
\param length The size of the unreliable packet.
|
|
\param data The data of the unreliable packet.
|
|
*/
|
|
void Netchan_Transmit (netchan_t *chan, unsigned length, byte *data);
|
|
|
|
/** Send an out-of-band packet.
|
|
|
|
\param adr The address to which the data will be sent.
|
|
\param length The length of the data to be sent.
|
|
\param data The data to be sent.
|
|
*/
|
|
void Netchan_OutOfBand (netadr_t adr, unsigned length, byte *data);
|
|
/** Send a formatted string as an out-of-band packet.
|
|
|
|
\param adr The address to which the data will be sent.
|
|
\param format The printf style format string.
|
|
*/
|
|
void Netchan_OutOfBandPrint (netadr_t adr, const char *format, ...)
|
|
__attribute__ ((format (PRINTF,2,3)));
|
|
|
|
/** Process a packet for the specifiied connection.
|
|
|
|
Called when the current net_message is from remote_address.
|
|
Modifies net_message so that it points to the packet payload.
|
|
|
|
\param chan The netchan representing the connection.
|
|
*/
|
|
bool Netchan_Process (netchan_t *chan);
|
|
|
|
/** Initialize a new connection.
|
|
|
|
\param chan The netchan representing the connection.
|
|
\param adr The address of the remote end of the connection.
|
|
\param qport The qport associated with the connection.
|
|
\param flags Control of the sending/reading of the qport on this
|
|
connection.
|
|
*/
|
|
void Netchan_Setup (netchan_t *chan, netadr_t adr, int qport, ncqport_e flags);
|
|
|
|
/** Check if a packet can be sent to the connection.
|
|
|
|
\param chan The netchan representing the connection.
|
|
\return True if the connection isn't chocked.
|
|
*/
|
|
bool Netchan_CanPacket (netchan_t *chan) __attribute__((pure));
|
|
|
|
/** Check if a reliable packet can be sent to the connection.
|
|
|
|
\param chan The netchan representing the connection.
|
|
\return True if there is no outstanding reliable packet and the
|
|
connection isn't chocked.
|
|
*/
|
|
bool Netchan_CanReliable (netchan_t *chan) __attribute__((pure));
|
|
|
|
/** Send a packet.
|
|
|
|
Very raw. Just calls NET_SendPacket().
|
|
\param length The length of the data to be sent.
|
|
\param data The data to be sent.
|
|
\param to The address to which the data will be sent.
|
|
*/
|
|
void Netchan_SendPacket (int length, const void *data, netadr_t to);
|
|
|
|
///@}
|
|
|
|
#endif // _NET_H
|