ref: b3c40063829b83b0b87912973e123ea0f6e05390
dir: /src/net_client.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: net_client.c 279 2006-01-10 19:59:26Z fraggle $
//
// 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.
//
// $Log$
// Revision 1.16 2006/01/10 19:59:25 fraggle
// Reliable packet transport mechanism
//
// Revision 1.15 2006/01/09 02:03:39 fraggle
// Send clients their player number, and indicate on the waiting screen
// which client we are.
//
// Revision 1.14 2006/01/09 01:50:51 fraggle
// Deduce a sane player name by examining environment variables. Add
// a "player_name" setting to chocolate-doom.cfg. Transmit the name
// to the server and use the names players send in the waiting data list.
//
// Revision 1.13 2006/01/08 04:52:26 fraggle
// Allow the server to reject clients
//
// Revision 1.12 2006/01/08 03:36:40 fraggle
// Fix double free of addresses
//
// Revision 1.11 2006/01/08 02:53:31 fraggle
// Detect when client connection is disconnected.
//
// Revision 1.10 2006/01/08 00:10:47 fraggle
// Move common connection code into net_common.c, shared by server
// and client code.
//
// Revision 1.9 2006/01/07 20:08:11 fraggle
// Send player name and address in the waiting data packets. Display these
// on the waiting screen, and improve the waiting screen appearance.
//
// Revision 1.8 2006/01/02 21:50:26 fraggle
// Restructure the waiting screen code. Establish our own separate event
// loop while waiting for the game to start, to avoid affecting the original
// code too much. Move some _gui variables to net_client.c.
//
// Revision 1.7 2006/01/02 20:14:07 fraggle
// Fix connect timeout and shutdown client properly if we fail to connect.
//
// Revision 1.6 2006/01/02 00:54:17 fraggle
// Fix packet not freed back after being sent.
// Code to disconnect clients from the server side.
//
// Revision 1.5 2006/01/02 00:00:08 fraggle
// Neater prefixes: NET_Client -> NET_CL_. NET_Server -> NET_SV_.
//
// Revision 1.4 2006/01/01 23:54:31 fraggle
// Client disconnect code
//
// Revision 1.3 2005/12/30 18:58:22 fraggle
// Fix client code to correctly send reply to server on connection.
// Add "waiting screen" while waiting for the game to start.
// Hook in the new networking code into the main game code.
//
// Revision 1.2 2005/12/29 21:29:55 fraggle
// Working client connect code
//
// Revision 1.1 2005/12/29 17:48:25 fraggle
// Add initial client/server connect code. Reorganise sources list in
// Makefile.am.
//
//
// Network client code
//
#include <stdlib.h>
#include "doomdef.h"
#include "doomstat.h"
#include "i_system.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"
typedef enum
{
// waiting for the game to start
CLIENT_STATE_WAITING_START,
// in game
CLIENT_STATE_IN_GAME,
} net_clientstate_t;
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;
// if TRUE, this client is the controller of the game
boolean net_client_controller = false;
// Number of clients currently connected to the server
int net_clients_in_game;
// Names of all players
char net_player_addresses[MAXPLAYERS][MAXPLAYERNAME];
char net_player_names[MAXPLAYERS][MAXPLAYERNAME];
// 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;
// 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.
}
}
// 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 is_controller;
unsigned int player_number;
char *player_names[MAXPLAYERS];
char *player_addr[MAXPLAYERS];
int i;
if (!NET_ReadInt8(packet, &num_players)
|| !NET_ReadInt8(packet, &is_controller)
|| !NET_ReadInt8(packet, &player_number))
{
// invalid packet
return;
}
if (num_players > MAXPLAYERS
|| player_number >= num_players)
{
// insane data
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;
}
}
net_clients_in_game = num_players;
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';
}
}
// 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:
break;
case NET_PACKET_TYPE_GAMEDATA:
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)
{
// disconnected from server
NET_CL_Shutdown();
}
net_waiting_for_start = client_connection.state == NET_CONN_STATE_CONNECTED
&& client_state == CLIENT_STATE_WAITING_START;
}
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_WriteInt16(packet, gamemode);
NET_WriteInt16(packet, gamemission);
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;
// 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;
// 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(10);
}
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(10);
}
// 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();
}