ref: 5795f86ba16e2a425b4ea3a87b96da446fed30b4
dir: /src/i_net.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: i_net.c 18 2005-07-23 18:56:07Z fraggle $
//
// Copyright(C) 1993-1996 Id Software, Inc.
// 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 1.3 2005/07/23 18:56:07 fraggle
// Remove unneccessary pragmas
//
// Revision 1.2 2005/07/23 16:44:55 fraggle
// Update copyright to GNU GPL
//
// Revision 1.1.1.1 2005/07/23 16:20:32 fraggle
// Initial import
//
//
// DESCRIPTION:
//
//-----------------------------------------------------------------------------
static const char
rcsid[] = "$Id: i_net.c 18 2005-07-23 18:56:07Z fraggle $";
#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"
#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);
//
// NETWORKING
//
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)
I_Error ("can't create socket: %s",strerror(errno));
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 , &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, &sw, sizeof(sw), 0
, (struct sockaddr *)&fromaddress, &fromlen );
if (c == -1 )
{
if (errno != EWOULDBLOCK)
I_Error ("GetPacket: %s",strerror(errno));
doomcom->remotenode = -1; // no packet
return;
}
{
static int first=1;
if (first)
printf("len=%d:p=[0x%x 0x%x] \n", c, *(int*)&sw, *((int*)&sw+1));
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;
int p;
struct hostent* hostentry; // host information entry
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);
}
// 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;
}
netsend = PacketSend;
netget = PacketGet;
netgame = true;
// parse player number and host list
doomcom->consoleplayer = myargv[i+1][0]-'1';
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] == '.')
{
sendaddress[doomcom->numnodes].sin_addr.s_addr
= inet_addr (myargv[i]+1);
}
else
{
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++;
}
doomcom->id = DOOMCOM_ID;
doomcom->numplayers = doomcom->numnodes;
// build message to receive
insocket = UDPsocket ();
BindToLocalPort (insocket,htons(DOOMPORT));
ioctl (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);
}