ref: b05a3f9448a690bf1d6805ed20081227921f64d9
dir: /src/net_client.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 2005 Simon Howard
//
// 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 the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// Network client code
//
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "doomtype.h"
#include "doomstat.h"
#include "deh_main.h"
#include "deh_str.h"
#include "g_game.h"
#include "i_system.h"
#include "i_timer.h"
#include "m_argv.h"
#include "m_config.h"
#include "net_client.h"
#include "net_common.h"
#include "net_defs.h"
#include "net_gui.h"
#include "net_io.h"
#include "net_packet.h"
#include "net_server.h"
#include "net_structrw.h"
#include "w_checksum.h"
#include "w_wad.h"
typedef enum
{
// waiting for the game to start
CLIENT_STATE_WAITING_START,
// in game
CLIENT_STATE_IN_GAME,
} net_clientstate_t;
// Type of structure used in the receive window
typedef struct
{
// Whether this tic has been received yet
boolean active;
// Last time we sent a resend request for this tic
unsigned int resend_time;
// Tic data from server
net_full_ticcmd_t cmd;
} net_server_recv_t;
// Type of structure used in the send window
typedef struct
{
// Whether this slot is active yet
boolean active;
// The tic number
unsigned int seq;
// Time the command was generated
unsigned int time;
// Ticcmd diff
net_ticdiff_t cmd;
} net_server_send_t;
extern fixed_t offsetms;
static net_connection_t client_connection;
static net_clientstate_t client_state;
static net_addr_t *server_addr;
static net_context_t *client_context;
// true if the client code is in use
boolean net_client_connected;
// true if we have received waiting data from the server
boolean net_client_received_wait_data;
// if true, this client is the controller of the game
boolean net_client_controller = false;
// Number of clients currently connected to the server
unsigned int net_clients_in_game;
// Number of drone players connected to the server
unsigned int net_drones_in_game;
// Names of all players
char net_player_addresses[MAXPLAYERS][MAXPLAYERNAME];
char net_player_names[MAXPLAYERS][MAXPLAYERNAME];
// MD5 checksums of the wad directory and dehacked data that the server
// has sent to us.
md5_digest_t net_server_wad_md5sum;
md5_digest_t net_server_deh_md5sum;
// Is the server a freedoom game?
unsigned int net_server_is_freedoom;
// Player number
int net_player_number;
// Waiting for the game to start?
boolean net_waiting_for_start = false;
// Name that we send to the server
char *net_player_name = NULL;
// The last ticcmd constructed
static ticcmd_t last_ticcmd;
// Buffer of ticcmd diffs being sent to the server
static net_server_send_t send_queue[BACKUPTICS];
// Receive window
static ticcmd_t recvwindow_cmd_base[MAXPLAYERS];
static int recvwindow_start;
static net_server_recv_t recvwindow[BACKUPTICS];
// Whether we need to send an acknowledgement and
// when gamedata was last received.
static boolean need_to_acknowledge;
static unsigned int gamedata_recv_time;
// Hash checksums of our wad directory and dehacked data.
md5_digest_t net_local_wad_md5sum;
md5_digest_t net_local_deh_md5sum;
// Are we playing with the freedoom IWAD?
unsigned int net_local_is_freedoom;
// Average time between sending our ticcmd and receiving from the server
static fixed_t average_latency;
#define NET_CL_ExpandTicNum(b) NET_ExpandTicNum(recvwindow_start, (b))
// Called when a player leaves the game
static void NET_CL_PlayerQuitGame(player_t *player)
{
static char exitmsg[80];
// Do this the same way as Vanilla Doom does, to allow dehacked
// replacements of this message
strcpy(exitmsg, DEH_String("Player 1 left the game"));
exitmsg[7] += player - players;
players[consoleplayer].message = exitmsg;
// TODO: check if it is sensible to do this:
if (demorecording)
{
G_CheckDemoStatus ();
}
}
// Called when we become disconnected from the server
static void NET_CL_Disconnected(void)
{
int i;
// In drone mode, the game cannot continue once disconnected.
if (drone)
{
I_Error("Disconnected from server in drone mode.");
}
// disconnected from server
players[consoleplayer].message = "Disconnected from server";
printf("Disconnected from server.\n");
for (i=0; i<MAXPLAYERS; ++i)
{
if (i != consoleplayer)
playeringame[i] = false;
}
}
// Expand a net_full_ticcmd_t, applying the diffs in cmd->cmds as
// patches against recvwindow_cmd_base. Place the results into
// the d_net.c structures (netcmds/nettics) and save the new ticcmd
// back into recvwindow_cmd_base.
static void NET_CL_ExpandFullTiccmd(net_full_ticcmd_t *cmd, unsigned int seq)
{
int latency;
fixed_t adjustment;
int i;
// Update average_latency
if (seq == send_queue[seq % BACKUPTICS].seq)
{
latency = I_GetTimeMS() - send_queue[seq % BACKUPTICS].time;
}
else if (seq > send_queue[seq % BACKUPTICS].seq)
{
// We have received the ticcmd from the server before we have
// even sent ours
latency = 0;
}
else
{
latency = -1;
}
if (latency >= 0)
{
if (seq <= 20)
{
average_latency = latency * FRACUNIT;
}
else
{
// Low level filter
average_latency = (fixed_t)((average_latency * 0.9)
+ (latency * FRACUNIT * 0.1));
}
}
//printf("latency: %i\tremote:%i\n", average_latency / FRACUNIT,
// cmd->latency);
// Possibly adjust offsetms in d_net.c, try to make players all have
// the same lag. Don't adjust in the first few tics of play, as
// we don't have an accurate value for average_latency yet.
if (seq > TICRATE)
{
adjustment = (cmd->latency * FRACUNIT) - average_latency;
// Only adjust very slightly; the cumulative effect over
// multiple tics will sort it out.
adjustment = adjustment / 100;
offsetms += adjustment;
}
// Expand tic diffs for all players
for (i=0; i<MAXPLAYERS; ++i)
{
if (i == consoleplayer && !drone)
{
continue;
}
if (playeringame[i] && !cmd->playeringame[i])
{
NET_CL_PlayerQuitGame(&players[i]);
}
playeringame[i] = cmd->playeringame[i];
if (playeringame[i])
{
net_ticdiff_t *diff;
ticcmd_t ticcmd;
diff = &cmd->cmds[i];
// Use the ticcmd diff to patch the previous ticcmd to
// the new ticcmd
NET_TiccmdPatch(&recvwindow_cmd_base[i], diff, &ticcmd);
// Save in d_net.c structures
netcmds[i][nettics[i] % BACKUPTICS] = ticcmd;
++nettics[i];
// Store a copy for next time
recvwindow_cmd_base[i] = ticcmd;
}
}
}
// Advance the receive window
static void NET_CL_AdvanceWindow(void)
{
while (recvwindow[0].active)
{
// Expand tic diff data into d_net.c structures
NET_CL_ExpandFullTiccmd(&recvwindow[0].cmd, recvwindow_start);
// Advance the window
memcpy(recvwindow, recvwindow + 1,
sizeof(net_server_recv_t) * (BACKUPTICS - 1));
memset(&recvwindow[BACKUPTICS-1], 0, sizeof(net_server_recv_t));
++recvwindow_start;
//printf("CL: advanced to %i\n", recvwindow_start);
}
}
// Shut down the client code, etc. Invoked after a disconnect.
static void NET_CL_Shutdown(void)
{
if (net_client_connected)
{
net_client_connected = false;
NET_FreeAddress(server_addr);
// Shut down network module, etc. To do.
}
}
void NET_CL_StartGame(void)
{
net_packet_t *packet;
net_gamesettings_t settings;
int i;
// Fill in game settings structure with appropriate parameters
// for the new game
settings.deathmatch = deathmatch;
settings.episode = startepisode;
settings.map = startmap;
settings.skill = startskill;
settings.loadgame = startloadgame;
settings.gameversion = gameversion;
settings.nomonsters = nomonsters;
settings.fast_monsters = fastparm;
settings.respawn_monsters = respawnparm;
settings.timelimit = timelimit;
//!
// @category net
//
// Use original game sync code.
//
if (M_CheckParm("-oldsync") > 0)
settings.new_sync = 0;
else
settings.new_sync = 1;
//!
// @category net
// @arg <n>
//
// Send n extra tics in every packet as insurance against dropped
// packets.
//
i = M_CheckParm("-extratics");
if (i > 0)
settings.extratics = atoi(myargv[i+1]);
else
settings.extratics = 1;
//!
// @category net
// @arg <n>
//
// Reduce the resolution of the game by a factor of n, reducing
// the amount of network bandwidth needed.
//
i = M_CheckParm("-dup");
if (i > 0)
settings.ticdup = atoi(myargv[i+1]);
else
settings.ticdup = 1;
// Start from a ticcmd of all zeros
memset(&last_ticcmd, 0, sizeof(ticcmd_t));
// Send packet
packet = NET_Conn_NewReliable(&client_connection,
NET_PACKET_TYPE_GAMESTART);
NET_WriteSettings(packet, &settings);
}
static void NET_CL_SendGameDataACK(void)
{
net_packet_t *packet;
packet = NET_NewPacket(10);
NET_WriteInt16(packet, NET_PACKET_TYPE_GAMEDATA_ACK);
NET_WriteInt8(packet, (gametic / ticdup) & 0xff);
NET_Conn_SendPacket(&client_connection, packet);
NET_FreePacket(packet);
need_to_acknowledge = false;
}
static void NET_CL_SendTics(int start, int end)
{
net_packet_t *packet;
int i;
if (!net_client_connected)
{
// Disconnected from server
return;
}
if (start < 0)
start = 0;
// Build a new packet to send to the server
packet = NET_NewPacket(512);
NET_WriteInt16(packet, NET_PACKET_TYPE_GAMEDATA);
// Write the start tic and number of tics. Send only the low byte
// of start - it can be inferred by the server.
NET_WriteInt8(packet, (gametic / ticdup) & 0xff);
NET_WriteInt8(packet, start & 0xff);
NET_WriteInt8(packet, end - start + 1);
// Add the tics.
for (i=start; i<=end; ++i)
{
net_server_send_t *sendobj;
sendobj = &send_queue[i % BACKUPTICS];
NET_WriteInt16(packet, average_latency / FRACUNIT);
NET_WriteTiccmdDiff(packet, &sendobj->cmd, lowres_turn);
}
// Send the packet
NET_Conn_SendPacket(&client_connection, packet);
// All done!
NET_FreePacket(packet);
// Acknowledgement has been sent as part of the packet
need_to_acknowledge = false;
}
// Add a new ticcmd to the send queue
void NET_CL_SendTiccmd(ticcmd_t *ticcmd, int maketic)
{
net_ticdiff_t diff;
net_server_send_t *sendobj;
int starttic, endtic;
// Calculate the difference to the last ticcmd
NET_TiccmdDiff(&last_ticcmd, ticcmd, &diff);
// Store in the send queue
sendobj = &send_queue[maketic % BACKUPTICS];
sendobj->active = true;
sendobj->seq = maketic;
sendobj->time = I_GetTimeMS();
sendobj->cmd = diff;
last_ticcmd = *ticcmd;
// Send to server.
starttic = maketic - extratics;
endtic = maketic;
if (starttic < 0)
starttic = 0;
NET_CL_SendTics(starttic, endtic);
}
// data received while we are waiting for the game to start
static void NET_CL_ParseWaitingData(net_packet_t *packet)
{
unsigned int num_players;
unsigned int num_drones;
unsigned int is_controller;
signed int player_number;
char *player_names[MAXPLAYERS];
char *player_addr[MAXPLAYERS];
md5_digest_t wad_md5sum, deh_md5sum;
unsigned int server_is_freedoom;
size_t i;
if (!NET_ReadInt8(packet, &num_players)
|| !NET_ReadInt8(packet, &num_drones)
|| !NET_ReadInt8(packet, &is_controller)
|| !NET_ReadSInt8(packet, &player_number))
{
// invalid packet
return;
}
if (num_players > MAXPLAYERS)
{
// insane data
return;
}
if ((player_number >= 0 && drone)
|| (player_number < 0 && !drone)
|| (player_number >= (signed int) num_players))
{
// Invalid player number
return;
}
// Read the player names
for (i=0; i<num_players; ++i)
{
player_names[i] = NET_ReadString(packet);
player_addr[i] = NET_ReadString(packet);
if (player_names[i] == NULL || player_addr[i] == NULL)
{
return;
}
}
if (!NET_ReadMD5Sum(packet, wad_md5sum)
|| !NET_ReadMD5Sum(packet, deh_md5sum)
|| !NET_ReadInt8(packet, &server_is_freedoom))
{
return;
}
net_clients_in_game = num_players;
net_drones_in_game = num_drones;
net_client_controller = is_controller != 0;
net_player_number = player_number;
for (i=0; i<num_players; ++i)
{
strncpy(net_player_names[i], player_names[i], MAXPLAYERNAME);
net_player_names[i][MAXPLAYERNAME-1] = '\0';
strncpy(net_player_addresses[i], player_addr[i], MAXPLAYERNAME);
net_player_addresses[i][MAXPLAYERNAME-1] = '\0';
}
memcpy(net_server_wad_md5sum, wad_md5sum, sizeof(md5_digest_t));
memcpy(net_server_deh_md5sum, deh_md5sum, sizeof(md5_digest_t));
net_server_is_freedoom = server_is_freedoom;
net_client_received_wait_data = true;
}
static void NET_CL_ParseGameStart(net_packet_t *packet)
{
net_gamesettings_t settings;
unsigned int num_players;
signed int player_number;
unsigned int i;
if (!NET_ReadInt8(packet, &num_players)
|| !NET_ReadSInt8(packet, &player_number)
|| !NET_ReadSettings(packet, &settings))
{
return;
}
if (client_state != CLIENT_STATE_WAITING_START)
{
return;
}
if (num_players > MAXPLAYERS || player_number >= (signed int) num_players)
{
// insane values
return;
}
if ((drone && player_number >= 0)
|| (!drone && player_number < 0))
{
// Invalid player number: must be positive for real players,
// negative for drones
return;
}
// Start the game
if (!drone)
{
consoleplayer = player_number;
}
else
{
consoleplayer = 0;
}
for (i=0; i<MAXPLAYERS; ++i)
{
playeringame[i] = i < num_players;
}
client_state = CLIENT_STATE_IN_GAME;
deathmatch = settings.deathmatch;
ticdup = settings.ticdup;
extratics = settings.extratics;
startepisode = settings.episode;
startmap = settings.map;
startskill = settings.skill;
startloadgame = settings.loadgame;
lowres_turn = settings.lowres_turn;
nomonsters = settings.nomonsters;
fastparm = settings.fast_monsters;
respawnparm = settings.respawn_monsters;
net_cl_new_sync = settings.new_sync != 0;
timelimit = settings.timelimit;
if (net_cl_new_sync == false)
{
printf("Syncing netgames like Vanilla Doom.\n");
}
if (lowres_turn)
{
printf("NOTE: Turning resolution is reduced; this is probably "
"because there is a client recording a Vanilla demo.\n");
}
// Clear the receive window
memset(recvwindow, 0, sizeof(recvwindow));
recvwindow_start = 0;
memset(&recvwindow_cmd_base, 0, sizeof(recvwindow_cmd_base));
// Clear the send queue
memset(&send_queue, 0x00, sizeof(send_queue));
netgame = true;
autostart = true;
}
static void NET_CL_SendResendRequest(int start, int end)
{
net_packet_t *packet;
unsigned int nowtime;
int i;
//printf("CL: Send resend %i-%i\n", start, end);
packet = NET_NewPacket(64);
NET_WriteInt16(packet, NET_PACKET_TYPE_GAMEDATA_RESEND);
NET_WriteInt32(packet, start);
NET_WriteInt8(packet, end - start + 1);
NET_Conn_SendPacket(&client_connection, packet);
NET_FreePacket(packet);
nowtime = I_GetTimeMS();
// Save the time we sent the resend request
for (i=start; i<=end; ++i)
{
int index;
index = i - recvwindow_start;
if (index < 0 || index >= BACKUPTICS)
continue;
recvwindow[index].resend_time = nowtime;
}
}
// Check for expired resend requests
static void NET_CL_CheckResends(void)
{
int i;
int resend_start, resend_end;
unsigned int nowtime;
nowtime = I_GetTimeMS();
resend_start = -1;
resend_end = -1;
for (i=0; i<BACKUPTICS; ++i)
{
net_server_recv_t *recvobj;
boolean need_resend;
recvobj = &recvwindow[i];
// if need_resend is true, this tic needs another retransmit
// request (300ms timeout)
need_resend = !recvobj->active
&& recvobj->resend_time != 0
&& nowtime > recvobj->resend_time + 300;
if (need_resend)
{
// Start a new run of resend tics?
if (resend_start < 0)
{
resend_start = i;
}
resend_end = i;
}
else
{
if (resend_start >= 0)
{
// End of a run of resend tics
//printf("CL: resend request timed out: %i-%i\n", resend_start, resend_end);
NET_CL_SendResendRequest(recvwindow_start + resend_start,
recvwindow_start + resend_end);
resend_start = -1;
}
}
}
if (resend_start >= 0)
{
//printf("CL: resend request timed out: %i-%i\n", resend_start, resend_end);
NET_CL_SendResendRequest(recvwindow_start + resend_start,
recvwindow_start + resend_end);
}
// We have received some data from the server and not acknowledged
// it yet. Normally this gets acknowledged when we send our game
// data, but if the client is a drone we need to do this.
if (need_to_acknowledge && nowtime - gamedata_recv_time > 200)
{
NET_CL_SendGameDataACK();
}
}
// Parsing of NET_PACKET_TYPE_GAMEDATA packets
// (packets containing the actual ticcmd data)
static void NET_CL_ParseGameData(net_packet_t *packet)
{
net_server_recv_t *recvobj;
unsigned int seq, num_tics;
unsigned int nowtime;
int resend_start, resend_end;
size_t i;
int index;
// Read header
if (!NET_ReadInt8(packet, &seq)
|| !NET_ReadInt8(packet, &num_tics))
{
return;
}
nowtime = I_GetTimeMS();
// Whatever happens, we now need to send an acknowledgement of our
// current receive point.
if (!need_to_acknowledge)
{
need_to_acknowledge = true;
gamedata_recv_time = nowtime;
}
// Expand byte value into the full tic number
seq = NET_CL_ExpandTicNum(seq);
for (i=0; i<num_tics; ++i)
{
net_full_ticcmd_t cmd;
index = seq - recvwindow_start + i;
if (!NET_ReadFullTiccmd(packet, &cmd, lowres_turn))
{
return;
}
if (index < 0 || index >= BACKUPTICS)
{
// Out of range of the recv window
continue;
}
// Store in the receive window
recvobj = &recvwindow[index];
recvobj->active = true;
recvobj->cmd = cmd;
}
// Has this been received out of sequence, ie. have we not received
// all tics before the first tic in this packet? If so, send a
// resend request.
//printf("CL: %p: %i\n", client, seq);
resend_end = seq - recvwindow_start;
if (resend_end <= 0)
return;
if (resend_end >= BACKUPTICS)
resend_end = BACKUPTICS - 1;
index = resend_end - 1;
resend_start = resend_end;
while (index >= 0)
{
recvobj = &recvwindow[index];
if (recvobj->active)
{
// ended our run of unreceived tics
break;
}
if (recvobj->resend_time != 0)
{
// Already sent a resend request for this tic
break;
}
resend_start = index;
--index;
}
// Possibly send a resend request
if (resend_start < resend_end)
{
NET_CL_SendResendRequest(recvwindow_start + resend_start,
recvwindow_start + resend_end - 1);
}
}
// Parse a resend request from the server due to a dropped packet
static void NET_CL_ParseResendRequest(net_packet_t *packet)
{
static unsigned int start;
static unsigned int end;
static unsigned int num_tics;
if (drone)
{
// Drones don't send gamedata.
return;
}
if (!NET_ReadInt32(packet, &start)
|| !NET_ReadInt8(packet, &num_tics))
{
return;
}
end = start + num_tics - 1;
//printf("requested resend %i-%i .. ", start, end);
// Check we have the tics being requested. If not, reduce the
// window of tics to only what we have.
while (start <= end
&& (!send_queue[start % BACKUPTICS].active
|| send_queue[start % BACKUPTICS].seq != start))
{
++start;
}
while (start <= end
&& (!send_queue[end % BACKUPTICS].active
|| send_queue[end % BACKUPTICS].seq != end))
{
--end;
}
//printf("%i-%i\n", start, end);
// Resend those tics
if (start <= end)
{
//printf("CL: resend %i-%i\n", start, start+num_tics-1);
NET_CL_SendTics(start, end);
}
}
// Console message that the server wants the client to print
static void NET_CL_ParseConsoleMessage(net_packet_t *packet)
{
char *msg;
msg = NET_ReadString(packet);
if (msg == NULL)
{
return;
}
printf("Message from server: ");
NET_SafePuts(msg);
}
// parse a received packet
static void NET_CL_ParsePacket(net_packet_t *packet)
{
unsigned int packet_type;
if (!NET_ReadInt16(packet, &packet_type))
{
return;
}
if (NET_Conn_Packet(&client_connection, packet, &packet_type))
{
// Packet eaten by the common connection code
}
else
{
switch (packet_type)
{
case NET_PACKET_TYPE_WAITING_DATA:
NET_CL_ParseWaitingData(packet);
break;
case NET_PACKET_TYPE_GAMESTART:
NET_CL_ParseGameStart(packet);
break;
case NET_PACKET_TYPE_GAMEDATA:
NET_CL_ParseGameData(packet);
break;
case NET_PACKET_TYPE_GAMEDATA_RESEND:
NET_CL_ParseResendRequest(packet);
break;
case NET_PACKET_TYPE_CONSOLE_MESSAGE:
NET_CL_ParseConsoleMessage(packet);
break;
default:
break;
}
}
}
// "Run" the client code: check for new packets, send packets as
// needed
void NET_CL_Run(void)
{
net_addr_t *addr;
net_packet_t *packet;
if (!net_client_connected)
{
return;
}
while (NET_RecvPacket(client_context, &addr, &packet))
{
// only accept packets from the server
if (addr == server_addr)
{
NET_CL_ParsePacket(packet);
}
else
{
NET_FreeAddress(addr);
}
NET_FreePacket(packet);
}
// Run the common connection code to send any packets as needed
NET_Conn_Run(&client_connection);
if (client_connection.state == NET_CONN_STATE_DISCONNECTED
|| client_connection.state == NET_CONN_STATE_DISCONNECTED_SLEEP)
{
NET_CL_Disconnected();
NET_CL_Shutdown();
}
net_waiting_for_start = client_connection.state == NET_CONN_STATE_CONNECTED
&& client_state == CLIENT_STATE_WAITING_START;
if (client_state == CLIENT_STATE_IN_GAME)
{
// Possibly advance the receive window
NET_CL_AdvanceWindow();
// Check if our resend requests have timed out
NET_CL_CheckResends();
}
}
static void NET_CL_SendSYN(void)
{
net_packet_t *packet;
packet = NET_NewPacket(10);
NET_WriteInt16(packet, NET_PACKET_TYPE_SYN);
NET_WriteInt32(packet, NET_MAGIC_NUMBER);
NET_WriteString(packet, PACKAGE_STRING);
NET_WriteInt16(packet, gamemode);
NET_WriteInt16(packet, gamemission);
NET_WriteInt8(packet, lowres_turn);
NET_WriteInt8(packet, drone);
NET_WriteMD5Sum(packet, net_local_wad_md5sum);
NET_WriteMD5Sum(packet, net_local_deh_md5sum);
NET_WriteInt8(packet, net_local_is_freedoom);
NET_WriteString(packet, net_player_name);
NET_Conn_SendPacket(&client_connection, packet);
NET_FreePacket(packet);
}
// connect to a server
boolean NET_CL_Connect(net_addr_t *addr)
{
int start_time;
int last_send_time;
server_addr = addr;
// Are we recording a demo? Possibly set lowres turn mode
if (M_CheckParm("-record") > 0 && M_CheckParm("-longtics") == 0)
{
lowres_turn = true;
}
// Read checksums of our WAD directory and dehacked information
W_Checksum(net_local_wad_md5sum);
DEH_Checksum(net_local_deh_md5sum);
// Are we playing with the Freedoom IWAD?
net_local_is_freedoom = W_CheckNumForName("FREEDOOM") >= 0;
// create a new network I/O context and add just the
// necessary module
client_context = NET_NewContext();
// initialise module for client mode
if (!addr->module->InitClient())
{
return false;
}
NET_AddModule(client_context, addr->module);
net_client_connected = true;
net_client_received_wait_data = false;
// Initialise connection
NET_Conn_InitClient(&client_connection, addr);
// try to connect
start_time = I_GetTimeMS();
last_send_time = -1;
while (client_connection.state == NET_CONN_STATE_CONNECTING)
{
int nowtime = I_GetTimeMS();
// Send a SYN packet every second.
if (nowtime - last_send_time > 1000 || last_send_time < 0)
{
NET_CL_SendSYN();
last_send_time = nowtime;
}
// time out after 5 seconds
if (nowtime - start_time > 5000)
{
break;
}
// run client code
NET_CL_Run();
// run the server, just incase we are doing a loopback
// connect
NET_SV_Run();
// Don't hog the CPU
I_Sleep(1);
}
if (client_connection.state == NET_CONN_STATE_CONNECTED)
{
// connected ok!
client_state = CLIENT_STATE_WAITING_START;
return true;
}
else
{
// failed to connect
NET_CL_Shutdown();
return false;
}
}
// disconnect from the server
void NET_CL_Disconnect(void)
{
int start_time;
if (!net_client_connected)
{
return;
}
NET_Conn_Disconnect(&client_connection);
start_time = I_GetTimeMS();
while (client_connection.state != NET_CONN_STATE_DISCONNECTED
&& client_connection.state != NET_CONN_STATE_DISCONNECTED_SLEEP)
{
if (I_GetTimeMS() - start_time > 5000)
{
// time out after 5 seconds
client_state = NET_CONN_STATE_DISCONNECTED;
fprintf(stderr, "NET_CL_Disconnect: Timeout while disconnecting from server\n");
break;
}
NET_CL_Run();
NET_SV_Run();
I_Sleep(1);
}
// Finished sending disconnect packets, etc.
NET_CL_Shutdown();
}
void NET_CL_Init(void)
{
// Try to set from the USER and USERNAME environment variables
// Otherwise, fallback to "Player"
if (net_player_name == NULL)
net_player_name = getenv("USER");
if (net_player_name == NULL)
net_player_name = getenv("USERNAME");
if (net_player_name == NULL)
net_player_name = "Player";
}
void NET_Init(void)
{
NET_CL_Init();
}
void NET_BindVariables(void)
{
M_BindVariable("player_name", &net_player_name);
}