i_net.c

游戏类程序源代码---WinDoom 3D源程序.zip

// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//
//-----------------------------------------------------------------------------

static const char
rcsid[] = "$Id: m_bbox.c,v 1.1 1997/02/03 22:45:10 b1 Exp $";

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

//#include <sys/socket.h>
//#include <netinet/in.h>
//#include <arpa/inet.h>
#include <errno.h>
//#include <unistd.h>
//#include <netdb.h>
//#include <sys/ioctl.h>

#include "i_system.h"
#include "d_event.h"
#include "d_net.h"
#include "m_argv.h"

#include "doomstat.h"

#ifdef __GNUG__
#pragma implementation "i_net.h"
#endif
#include "i_net.h"





// For some odd reason...
#define ntohl(x) \
        ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
                             (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
                             (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
                             (((unsigned long int)(x) & 0xff000000U) >> 24)))

#define ntohs(x) \
        ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
                              (((unsigned short int)(x) & 0xff00) >> 8))) \
	  
#define htonl(x) ntohl(x)
#define htons(x) ntohs(x)

void	NetSend (void);
boolean NetListen (void);


char MsgText[2048];
void WriteDebug(char *);

//
// NETWORKING
//

// FIXME
#define IPPORT_USERRESERVED 26000

int	DOOMPORT =	(IPPORT_USERRESERVED +0x1d );

int			sendsocket;
int			insocket;

struct	sockaddr_in	sendaddress[MAXNETNODES];

void	(*netget) (void);
void	(*netsend) (void);

//
// UDPsocket
//
int UDPsocket (void)
   {
    int	s;
	
    // allocate a socket
    s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (s < 0)
       {
        sprintf(MsgText, "ERROR:Can't create socket:%08X %s\n", errno, strerror(errno));
        I_Error(MsgText);
       }
		
    return s;
   }

//
// BindToLocalPort
//
void BindToLocalPort( int s, int port )
   {
    int			v;
    struct sockaddr_in	address;
	
    memset (&address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = port;

    v = bind(s, (void *)&address, sizeof(address));
    if (v == -1)
        I_Error ("BindToPort: bind: %s", strerror(errno));
   }


//
// PacketSend
//
void PacketSend (void)
{
    int		c;
    doomdata_t	sw;
				
    // byte swap
    sw.checksum = htonl(netbuffer->checksum);
    sw.player = netbuffer->player;
    sw.retransmitfrom = netbuffer->retransmitfrom;
    sw.starttic = netbuffer->starttic;
    sw.numtics = netbuffer->numtics;
    for (c=0 ; c< netbuffer->numtics ; c++)
    {
	sw.cmds[c].forwardmove = netbuffer->cmds[c].forwardmove;
	sw.cmds[c].sidemove = netbuffer->cmds[c].sidemove;
	sw.cmds[c].angleturn = htons(netbuffer->cmds[c].angleturn);
	sw.cmds[c].consistancy = htons(netbuffer->cmds[c].consistancy);
	sw.cmds[c].chatchar = netbuffer->cmds[c].chatchar;
	sw.cmds[c].buttons = netbuffer->cmds[c].buttons;
    }
		
    //printf ("sending %i\n",gametic);		
    c = sendto (sendsocket , (const char far *)&sw, doomcom->datalength
		,0,(void *)&sendaddress[doomcom->remotenode]
		,sizeof(sendaddress[doomcom->remotenode]));
	
    //	if (c == -1)
    //		I_Error ("SendPacket error: %s",strerror(errno));
}


//
// PacketGet
//
void PacketGet (void)
{
    int			i;
    int			c;
    struct sockaddr_in	fromaddress;
    int			fromlen;
    doomdata_t		sw;
				
    fromlen = sizeof(fromaddress);
    c = recvfrom (insocket, (char far *)&sw, sizeof(sw),0,(struct sockaddr *)&fromaddress, &fromlen );
    if (c == SOCKET_ERROR )
       {
        c = WSAGetLastError();
	    if (c != WSAEWOULDBLOCK)
	        I_Error ("GetPacket: Network error.");
	    doomcom->remotenode = -1;		// no packet
        return;
       }

    {
	static int first=1;
	if (first)
       {
	    sprintf(MsgText,"len=%d:p=[0x%x 0x%x] \n", c, *(int*)&sw, *((int*)&sw+1));
        WriteDebug(MsgText);
       }
	first = 0;
    }

    // find remote node number
    for (i=0 ; i<doomcom->numnodes ; i++)
	if ( fromaddress.sin_addr.s_addr == sendaddress[i].sin_addr.s_addr )
	    break;

    if (i == doomcom->numnodes)
    {
	// packet is not from one of the players (new game broadcast)
	doomcom->remotenode = -1;		// no packet
	return;
    }
	
    doomcom->remotenode = i;			// good packet from a game player
    doomcom->datalength = c;
	
    // byte swap
    netbuffer->checksum = ntohl(sw.checksum);
    netbuffer->player = sw.player;
    netbuffer->retransmitfrom = sw.retransmitfrom;
    netbuffer->starttic = sw.starttic;
    netbuffer->numtics = sw.numtics;

    for (c=0 ; c< netbuffer->numtics ; c++)
    {
	netbuffer->cmds[c].forwardmove = sw.cmds[c].forwardmove;
	netbuffer->cmds[c].sidemove = sw.cmds[c].sidemove;
	netbuffer->cmds[c].angleturn = ntohs(sw.cmds[c].angleturn);
	netbuffer->cmds[c].consistancy = ntohs(sw.cmds[c].consistancy);
	netbuffer->cmds[c].chatchar = sw.cmds[c].chatchar;
	netbuffer->cmds[c].buttons = sw.cmds[c].buttons;
    }
}



int GetLocalAddress (void)
{
    char		hostname[1024];
    struct hostent*	hostentry;	// host information entry
    int			v;

    // get local address
    v = gethostname (hostname, sizeof(hostname));
    if (v == -1)
	I_Error ("GetLocalAddress : gethostname: errno %d",errno);
	
    hostentry = gethostbyname (hostname);
    if (!hostentry)
	I_Error ("GetLocalAddress : gethostbyname: couldn't get local host");
		
    return *(int *)hostentry->h_addr_list[0];
}


//
// I_InitNetwork
//
void I_InitNetwork (void)
   {
    boolean		trueval = true;
    int			i, err;
    int			p;
    struct hostent*	hostentry;	// host information entry
    WORD wVersionRequested;  
    WSADATA wsaData; 

    doomcom = malloc (sizeof (*doomcom) );
    memset (doomcom, 0, sizeof(*doomcom) );
    
    // set up for network
    i = M_CheckParm ("-dup");
    if (i && i< myargc-1)
       {
	    doomcom->ticdup = myargv[i+1][0]-'0';
	    if (doomcom->ticdup < 1)
            doomcom->ticdup = 1;
        if (doomcom->ticdup > 9)
            doomcom->ticdup = 9;
       }
    else
       doomcom-> ticdup = 1;
	
    if (M_CheckParm ("-extratic"))
       doomcom-> extratics = 1;
    else
       doomcom-> extratics = 0;
		
    p = M_CheckParm ("-port");
    if (p && p<myargc-1)
       {
        DOOMPORT = atoi (myargv[p+1]);
        //printf ("using alternate port %i\n",DOOMPORT);
        sprintf (MsgText, "using alternate port %i\n",DOOMPORT);
        WriteDebug(MsgText);
       }
    
    // parse network game options,
    //  -net <consoleplayer> <host> <host> ...
    i = M_CheckParm ("-net");
    if (!i)
       {
        // single player game
        netgame = false;
        doomcom->id = DOOMCOM_ID;
        doomcom->numplayers = doomcom->numnodes = 1;
        doomcom->deathmatch = false;
        doomcom->consoleplayer = 0;
        return;
       }

    wVersionRequested = MAKEWORD(2,2); 
    err = WSAStartup(wVersionRequested, &wsaData); 
 
    netsend = PacketSend;
    netget = PacketGet;
    netgame = true;

    // parse player number and host list
    doomcom->consoleplayer = myargv[i+1][0]-'1';
    sprintf(MsgText, "console player number : %d\n", doomcom->consoleplayer);
    WriteDebug(MsgText);

    doomcom->numnodes = 1;	// this node for sure
	
    i++;
    while (++i < myargc && myargv[i][0] != '-')
       {
	    sendaddress[doomcom->numnodes].sin_family = AF_INET;
	    sendaddress[doomcom->numnodes].sin_port = htons(DOOMPORT);
	    if (myargv[i][0] == '.')
	       {
            sprintf(MsgText, "Node number %d address %s\n", doomcom->numnodes, myargv[i]+1);
            WriteDebug(MsgText);
	        sendaddress[doomcom->numnodes].sin_addr.s_addr = inet_addr(myargv[i]+1);
	       }
        else
           {
            sprintf(MsgText, "Node number %d hostname %s\n", doomcom->numnodes, myargv[i]);
            WriteDebug(MsgText);
            hostentry = gethostbyname(myargv[i]);
            if (!hostentry)
                I_Error ("gethostbyname: couldn't find %s", myargv[i]);
            sendaddress[doomcom->numnodes].sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];
           }
        doomcom->numnodes++;
       }
	
    sprintf(MsgText, "Total number of players : %d\n", (doomcom->numnodes-1));
    WriteDebug(MsgText);
    doomcom->id = DOOMCOM_ID;
    doomcom->numplayers = doomcom->numnodes;
    
// build message to receive
    insocket = UDPsocket();
    BindToLocalPort(insocket,htons(DOOMPORT));
    ioctlsocket(insocket, FIONBIO, &trueval);

    sendsocket = UDPsocket();
   }


void I_NetCmd (void)
{
    if (doomcom->command == CMD_SEND)
    {
	netsend ();
    }
    else if (doomcom->command == CMD_GET)
    {
	netget ();
    }
    else
	I_Error ("Bad net cmd: %i\n",doomcom->command);
}