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v4k-git-backup/demos/ports/doom/src/i_net.c

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// 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:
//
//-----------------------------------------------------------------------------
//#define I_NET_ENABLED
#if defined(I_NET_ENABLED)
#define _CRT_SECURE_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#endif
#include "doom_config.h"
#if defined(I_NET_ENABLED)
#if defined(DOOM_WIN32)
#define _CRT_SECURE_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <WinSock2.h>
#include <winsock.h>
#define IPPORT_USERRESERVED 5000
#pragma comment(lib, "ws2_32.lib")
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#define SOCKET int
#endif
#else
#define IPPORT_USERRESERVED 5000
#endif
#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...
#if !defined(DOOM_APPLE) // It doesn't complain on Win32? O_o
#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)
#endif
//
// NETWORKING
//
int DOOMPORT = (IPPORT_USERRESERVED + 0x1d);
int DOOMPORT_SEND = (IPPORT_USERRESERVED + 0x1e);
#if defined(I_NET_ENABLED)
SOCKET sendsocket;
SOCKET insocket;
struct sockaddr_in sendaddress[MAXNETNODES];
#endif
void (*netget) (void);
void (*netsend) (void);
void NetSend(void);
doom_boolean NetListen(void);
//
// UDPsocket
//
#if defined(I_NET_ENABLED)
SOCKET UDPsocket(void)
{
SOCKET s;
// allocate a socket
s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s < 0)
{
//I_Error("Error: can't create socket: %s", strerror(errno));
doom_strcpy(error_buf, "Error: can't create socket: ");
doom_concat(error_buf, strerror(errno));
I_Error(error_buf);
}
return s;
}
#endif
//
// BindToLocalPort
//
#if defined(I_NET_ENABLED)
void BindToLocalPort(SOCKET s, int port)
{
int v;
struct sockaddr_in address;
doom_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("Error: BindToPort: bind: %s", strerror(errno));
doom_strcpy(error_buf, "Error: BindToPort: bind: ");
doom_concat(error_buf, strerror(errno));
I_Error(error_buf);
}
}
#endif
//
// PacketSend
//
void PacketSend(void)
{
#if defined(I_NET_ENABLED)
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;
}
//doom_print ("sending %i\n",gametic);
c = sendto(sendsocket, (const char*)&sw, doomcom->datalength
, 0, (void*)&sendaddress[doomcom->remotenode]
, sizeof(sendaddress[doomcom->remotenode]));
#endif
}
//
// PacketGet
//
void PacketGet(void)
{
#if defined(I_NET_ENABLED)
int i;
int c;
struct sockaddr_in fromaddress;
#if defined(__APPLE__)
socklen_t fromlen;
#else
int fromlen;
#endif
doomdata_t sw;
fromlen = sizeof(fromaddress);
c = recvfrom(insocket, (char*)&sw, sizeof(sw), 0
, (struct sockaddr*)&fromaddress, &fromlen);
if (c == -1)
{
#if defined(DOOM_WIN32)
int r = WSAGetLastError();
if (r != WSAEWOULDBLOCK)
{
//I_Error("Error: GetPacket: %i", r);
doom_strcpy(error_buf, "Error: GetPacket: ");
doom_concat(error_buf, doom_itoa(r, 10));
I_Error(error_buf);
}
#else
if (errno != EWOULDBLOCK)
{
//I_Error("Error: GetPacket: %s", strerror(errno));
doom_strcpy(error_buf, "Error: GetPacket: ");
doom_concat(error_buf, strerror(errno));
I_Error(error_buf);
}
#endif
doomcom->remotenode = -1; // no packet
return;
}
{
static int first = 1;
if (first)
{
//doom_print("len=%d:p=[0x%x 0x%x] \n", c, *(int*)&sw, *((int*)&sw + 1));
doom_print("len=");
doom_print(doom_itoa(c, 10));
doom_print(":p=[0x");
doom_print(doom_itoa(*(int*)&sw, 16));
doom_print(" 0x");
doom_print(doom_itoa(*((int*)&sw + 1), 16));
doom_print("] \n");
}
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;
}
#endif
}
int GetLocalAddress(void)
{
#if defined(I_NET_ENABLED)
char hostname[1024];
struct hostent* hostentry; // host information entry
int v;
// get local address
v = gethostname(hostname, sizeof(hostname));
if (v == -1)
{
//I_Error("Error: GetLocalAddress : gethostname: errno %d", errno);
doom_strcpy(error_buf, "Error: GetLocalAddress : gethostname: errno ");
doom_concat(error_buf, strerror(errno));
I_Error(error_buf);
}
hostentry = gethostbyname(hostname);
if (!hostentry)
{
I_Error("Error: GetLocalAddress : gethostbyname: couldn't get local host");
}
return *(int*)hostentry->h_addr_list[0];
#else
return 0;
#endif
}
//
// I_InitNetwork
//
void I_InitNetwork(void)
{
#if defined(I_NET_ENABLED)
#if defined(DOOM_WIN32)
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
u_long trueval = 1;
#else
doom_boolean trueval = true;
#endif
#endif
int i;
int p;
struct hostent* hostentry; // host information entry
doomcom = doom_malloc(sizeof(*doomcom));
doom_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 = doom_atoi(myargv[p + 1]);
//doom_print("using alternate port %i\n", DOOMPORT);
doom_print("using alternate port ");
doom_print(doom_itoa(DOOMPORT, 10));
doom_print("\n");
}
p = M_CheckParm("-sendport");
if (p && p < myargc - 1)
{
DOOMPORT_SEND = doom_atoi(myargv[p + 1]);
//doom_print("using alternate send port %i\n", DOOMPORT_SEND);
doom_print("using alternate send port ");
doom_print(doom_itoa(DOOMPORT_SEND, 10));
doom_print("\n");
}
// 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;
}
#if defined(I_NET_ENABLED)
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("Error: gethostbyname: couldn't find %s", myargv[i]);
doom_strcpy(error_buf, "Error: gethostbyname: couldn't find ");
doom_concat(error_buf, myargv[i]);
I_Error(error_buf);
}
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));
#if defined(DOOM_WIN32)
ioctlsocket(insocket, FIONBIO, &trueval);
#else
ioctl(insocket, FIONBIO, &trueval);
#endif
sendsocket = UDPsocket();
#endif
}
void I_NetCmd(void)
{
#if defined(I_NET_ENABLED)
if (doomcom->command == CMD_SEND)
{
netsend();
}
else if (doomcom->command == CMD_GET)
{
netget();
}
else
{
//I_Error("Error: Bad net cmd: %i\n", doomcom->command);
doom_strcpy(error_buf, "Error: Bad net cmd: ");
doom_concat(error_buf, doom_itoa(doomcom->command, 10));
I_Error(error_buf);
}
#endif
}
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