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quakeforge/nq/source/net_bw.c
Bill Currie 1fce1ea12e run indent over all the .c files using qw's .indent.pro. The real reason for 
this is I mistakenly did so while making some other changes (which I made sure
were NOT in the checkin:)
2001-02-26 06:48:02 +00:00

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/*
net_bw.c
@description@
Copyright (C) 1996-1997 Id Software, Inc.
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <dpmi.h>
#include "dosisms.h"
// this section is general Unix stuff that we need
#define EIO 5 /* I/O error */
#define EBADS 9
#define EWOULDBLOCK 35 /* function would block */
#define EMSGSIZE 40 /* message to big for buffers */
#define EPROTONOSUPPORT 43 /* Protocol not supported */
#define ESOCKTNOSUPPORT 44 /* Socket type not supported */
#define EPFNOSUPPORT 46 /* Protocol family not supported */
#define EAFNOSUPPORT 47 /* Address family not supported */
#define ECONNABORTED 53 /* User requested hangup */
#define ENOBUFS 55 /* No buffers available */
#define EISCONN 56 /* Socket has closed */
#define ENOTCONN 57 /* Socket is not connected */
#define ESHUTDOWN 58 /* Socket is closed */
#define ETOOMANYREFS 59 /* Too many sockets open */
#define ETIMEDOUT 60 /* Connection timed out */
#define ECONNREFUSED 61 /* Connection refused */
#define AF_INET 2 /* internet */
#define PF_INET AF_INET
#define SOCK_STREAM 1 /* stream */
#define SOCK_DGRAM 2 /* datagram */
#define IPPROTO_TCP 6
#define IPPROTO_UDP 17
#define INADDR_ANY 0
#define SIOCDONE 0x7300
#define FIONREAD 0x667f
#define FIONBIO 0x667e
#define FIONWIN 0x1000
#define FIONTIN 0x2000
#define BRDINIT 0
#define BRDADDR 10
#define MAXHOSTNAMELEN 256
#define SOL_SOCKET 0xffff /* options for socket level */
/*
* Option flags per-socket.
*/
#define SO_DEBUG 0x0001 /* turn on debugging info recording */
#define SO_ACCEPTCONN 0x0002 /* socket has had listen() */
#define SO_REUSEADDR 0x0004 /* allow local address reuse */
#define SO_KEEPALIVE 0x0008 /* keep connections alive */
#define SO_DONTROUTE 0x0010 /* just use interface addresses */
#define SO_BROADCAST 0x0020 /* permit sending of broadcast msgs */
#define SO_USELOOPBACK 0x0040 /* bypass hardware when possible */
#define SO_LINGER 0x0080 /* linger on close if data present */
#define SO_OOBINLINE 0x0100 /* leave received OOB data in line */
#define SO_USEPRIV 0x4000 /* allocate from privileged port area
*/
#define SO_CANTSIG 0x8000 /* prevent SIGPIPE on SS_CANTSENDMORE
*/
/*
* Additional options, not kept in so_options.
*/
#define SO_SNDBUF 0x1001 /* send buffer size */
#define SO_RCVBUF 0x1002 /* receive buffer size */
#define SO_SNDLOWAT 0x1003 /* send low-water mark */
#define SO_RCVLOWAT 0x1004 /* receive low-water mark */
#define SO_SNDTIMEO 0x1005 /* send timeout */
#define SO_RCVTIMEO 0x1006 /* receive timeout */
#define SO_ERROR 0x1007 /* get error status and clear */
#define SO_TYPE 0x1008 /* get socket type */
struct in_addr {
union {
struct {
unsigned char s_b1, s_b2, s_b3, s_b4;
} S_un_b;
struct {
unsigned short s_w1, s_w2;
} S_un_w;
unsigned long S_addr;
} S_un;
};
#define s_addr S_un.S_addr /* can be used for most tcp & ip code
*/
#define s_host S_un.S_un_b.s_b2 /* host on imp */
#define s_net S_un.S_un_b.s_b1 /* network */
#define s_imp S_un.S_un_w.s_w2 /* imp */
#define s_impno S_un.S_un_b.s_b4 /* imp # */
#define s_lh S_un.S_un_b.s_b3 /* logical host */
struct sockaddr_in {
short sin_family;
unsigned short sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
struct hostent {
char *h_name; /* official name of host */
char **h_aliases; /* alias list */
int h_addrtype; /* host address type */
int h_length; /* length of address */
char **h_addr_list; /* list of addresses from name server
*/
#define h_addr h_addr_list[0] /* address, for backward compatiblity
*/
};
char *inet_ntoa (struct in_addr in);
// this section is B&W specific constants & structures
#define BW_IOCTL_BIND 0
#define BW_IOCTL_CLEAROPTIONS 5
#define BW_IOCTL_SETOPTIONS 6
#define BW_IOCTL_PEEK 7
#define BW_IOCTL_SETWINMASK 8
#define BW_OPTION_BLOCKING 0x01
#define BW_OPTION_REUSEBUFFERS 0x80
#define BW_ERR_USR_HANGUP 50
#define BW_ERR_HANGUP 51
#define BW_ERR_NET_ERR 52
#define BW_ERR_IS_CLOSED 53
#define BW_ERR_TIME_OUT 54
#define BW_ERR_RESET 55
#define BW_ERR_FULL 56
#define BW_ERR_BLOCK 57
#define BW_ERR_SHUTDOWN 58
#pragma pack(1)
typedef struct {
char state; // always 1
short localPort;
struct in_addr localAddr;
char reason; // always 0
char options;
short dataAvailable;
} BW_UDPinfo_t;
typedef struct {
char reserved1[6];
unsigned short info2Offset;
char reserved2[18];
struct in_addr remoteAddr;
} BW_UDPreadInfo1_t;
typedef struct {
short remotePort;
char reserved1[2];
unsigned short dataLenPlus8;
char reserved2[2];
char data[1]; // actual size is <dataLenPlus8> - 8
//
} BW_UDPreadInfo2_t;
typedef struct {
char reserved1[2];
short remotePort;
unsigned short dataLen;
struct in_addr remoteAddr;
char reserved2[42];
char data[1]; // actual size is <datalen>
} BW_writeInfo_t;
typedef struct {
short ioport;
byte dma;
byte vector;
byte irq;
short bufferSize;
short maxWindow;
short timeZone;
byte myType;
int inetAddr;
short value;
byte subnetMask;
short etherPointer;
short logserverPointer;
short nameserverPointer;
short printserverPointer;
short timeserverPointer;
short gatewayPointer;
short driverSegment;
byte transferSize;
char cardName[9];
} BW_ethdevinfo_t;
#pragma pack()
#define LOWMEM_SIZE 4096
static unsigned char *lowmem_buffer;
static int lowmem_bufseg;
static int lowmem_bufoff;
static BW_ethdevinfo_t ethdevinfo;
static int netmask;
static struct in_addr bcastaddr;
extern regs_t regs;
static int net_acceptsocket = -1; // socket for fielding new
// connections
static int net_controlsocket = 0;
#include "net_bw.h"
//=============================================================================
static int
BW_ioctl (int s, char *msg, int msglen)
{
Q_memcpy (lowmem_buffer, msg, msglen);
regs.x.ax = 0x4403;
regs.x.bx = s;
regs.x.cx = msglen;
regs.x.dx = lowmem_bufoff;
regs.x.ds = lowmem_bufseg;
if (dos_int86 (0x21))
return regs.x.ax;
return 0;
}
//=============================================================================
static int
BW_TranslateError (int error)
{
switch (error) {
case BW_ERR_USR_HANGUP:
return ECONNABORTED;
case BW_ERR_HANGUP:
return EISCONN;
case BW_ERR_NET_ERR:
return ENOTCONN;
case BW_ERR_IS_CLOSED:
return ENOTCONN;
case BW_ERR_TIME_OUT:
return ETIMEDOUT;
case BW_ERR_RESET:
return ECONNREFUSED;
case BW_ERR_FULL:
return ETOOMANYREFS;
case BW_ERR_BLOCK:
return EWOULDBLOCK;
case BW_ERR_SHUTDOWN:
return ESHUTDOWN;
}
return EIO;
}
//=============================================================================
static int
GetEthdevinfo (void)
{
int fd;
Q_strcpy ((char *) lowmem_buffer, "ETHDEV27");
regs.x.ax = 0x3d42;
regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
if (dos_int86 (0x21))
return -1;
fd = regs.x.ax;
regs.x.ax = 0x4401;
regs.x.bx = fd;
regs.x.dx = 0x60;
dos_int86 (0x21);
regs.h.ah = 0x3f;
regs.x.cx = sizeof (ethdevinfo);
regs.x.es = regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
regs.x.bx = fd;
if (dos_int86 (0x21))
return -1;
Q_memcpy (&ethdevinfo, lowmem_buffer, regs.x.ax);
regs.h.ah = 0x3e;
regs.x.bx = fd;
dos_int86 (0x21);
return 0;
}
//=============================================================================
int
BW_Init (void)
{
struct qsockaddr addr;
char *colon;
if (COM_CheckParm ("-noudp"))
return -1;
lowmem_buffer = dos_getmemory (LOWMEM_SIZE);
if (!lowmem_buffer)
Sys_Error ("not enough low memory\n");
lowmem_bufoff = ptr2real (lowmem_buffer) & 0xf;
lowmem_bufseg = ptr2real (lowmem_buffer) >> 4;
if (GetEthdevinfo ()) {
Con_DPrintf ("Beame & Whiteside TCP/IP not detected\n");
dos_freememory (lowmem_buffer);
return -1;
}
netmask = 0xffffffff >> (32 - ethdevinfo.subnetMask);
bcastaddr.s_addr = (ethdevinfo.inetAddr & netmask) | (~netmask);
if ((net_controlsocket = BW_OpenSocket (0)) == -1) {
dos_freememory (lowmem_buffer);
Con_DPrintf ("BW_Init unable to open control socket; disabled\n");
return -1;
}
BW_GetSocketAddr (net_controlsocket, &addr);
Q_strcpy (my_tcpip_address, BW_AddrToString (&addr));
colon = Q_strrchr (my_tcpip_address, ':');
if (colon)
*colon = 0;
Con_Printf ("BW_Init: UDP initialized\n");
tcpipAvailable = true;
return net_controlsocket;
}
//=============================================================================
void
BW_Shutdown (void)
{
BW_Listen (false);
BW_CloseSocket (net_controlsocket);
dos_freememory (lowmem_buffer);
}
//=============================================================================
void
BW_Listen (qboolean state)
{
// enable listening
if (state) {
if (net_acceptsocket != -1)
return;
if ((net_acceptsocket = BW_OpenSocket (net_hostport)) == -1)
Sys_Error ("BW_Listen: Unable to open accept socket\n");
return;
}
// disable listening
if (net_acceptsocket == -1)
return;
BW_CloseSocket (net_acceptsocket);
net_acceptsocket = -1;
}
//=============================================================================
/*
OpenSocket returns a handle to a network socket that has been opened,
set to nonblocking, and bound to <port>. Additional socket options
should be set here if they are needed. -1 is returned on failure.
*/
int
BW_OpenSocket (int port)
{
int s;
int ret;
int deadman = 3 * 1024;
static int dynamic = 1024;
static char reuse_msg[2] = { BW_IOCTL_SETOPTIONS, BW_OPTION_REUSEBUFFERS };
static char bind_msg[3] = { BW_IOCTL_BIND, 0, 0 };
static char nonblock_msg[2] = { BW_IOCTL_CLEAROPTIONS, BW_OPTION_BLOCKING };
// allocate a UDP socket
Q_strcpy ((char *) lowmem_buffer, "UDP-IP10");
regs.x.ax = 0x3d42;
regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
if (dos_int86 (0x21)) {
Con_Printf ("BW_OpenSocket failed: %u\n",
BW_TranslateError (regs.x.ax));
return -1;
}
s = regs.x.ax;
// set file descriptor to raw mode
regs.x.ax = 0x4401;
regs.x.bx = s;
regs.x.dx = 0x60;
dos_int86 (0x21);
if (BW_ioctl (s, reuse_msg, 2)) {
Con_Printf ("BW_OpenSocket ioctl(reuse) failed\n");
return -1;
}
if (BW_ioctl (s, nonblock_msg, 2)) {
Con_Printf ("BW_OpenSocket ioctl(nonblocking) failed\n");
return -1;
}
// if a socket was specified, bind to it and return
if (port) {
*(short *) &bind_msg[1] = port;
if (BW_ioctl (s, bind_msg, 3)) {
BW_CloseSocket (s);
return -1;
}
return s;
}
// B&W does NOT do dynamic allocation, so if port == 0 we must fake it
do {
port = dynamic++;
if (dynamic == 4096)
dynamic = 1024;
deadman--;
*(short *) &bind_msg[1] = port;
ret = BW_ioctl (s, bind_msg, 3);
}
while (ret && deadman);
if (ret)
return -1;
return s;
}
//=============================================================================
int
BW_CloseSocket (int socket)
{
regs.h.ah = 0x3e;
regs.x.bx = socket;
if (dos_int86 (0x21)) {
Con_Printf ("BW_CloseSocket %u failed: %u\n", socket,
BW_TranslateError (regs.x.ax));
return -1;
}
return 0;
}
//=============================================================================
int
BW_Connect (int socket, struct qsockaddr *hostaddr)
{
return 0;
}
//=============================================================================
int
BW_CheckNewConnections (void)
{
if (net_acceptsocket == 0)
return -1;
// see if there's anything waiting
regs.x.ax = 0x4406;
regs.x.bx = net_acceptsocket;
dos_int86 (0x21);
if (regs.x.ax == 0)
return -1;
return net_acceptsocket;
}
//=============================================================================
int
BW_Read (int s, byte * buf, int len, struct qsockaddr *from)
{
BW_UDPreadInfo1_t *info1;
BW_UDPreadInfo2_t *info2;
// ask if there's anything waiting
regs.x.ax = 0x4406;
regs.x.bx = s;
dos_int86 (0x21);
if (regs.x.ax == 0)
return 0;
// there was, so let's get it
regs.h.ah = 0x3f;
regs.x.cx = /* len + 53 */ LOWMEM_SIZE;
regs.x.es = regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
regs.x.bx = s;
if (dos_int86 (0x21)) {
Con_Printf ("BW UDP read error: %u\n", BW_TranslateError (regs.x.ax));
return -1;
}
info1 = (BW_UDPreadInfo1_t *) lowmem_buffer;
info2 = (BW_UDPreadInfo2_t *) (lowmem_buffer + info1->info2Offset);
if (from) {
from->sa_family = AF_INET;
((struct sockaddr_in *) from)->sin_addr = info1->remoteAddr;
((struct sockaddr_in *) from)->sin_port = htons (info2->remotePort);
}
len = info2->dataLenPlus8 - 8;
if (len > NET_DATAGRAMSIZE) {
Con_Printf ("BW UDP read packet too large: %u\n", len);
return -1;
}
Q_memcpy (buf, info2->data, len);
return len;
}
//=============================================================================
int
BW_Broadcast (int s, byte * msg, int len)
{
BW_writeInfo_t *writeInfo;
// ask if we're clear to send
regs.x.ax = 0x4407;
regs.x.bx = s;
dos_int86 (0x21);
if (regs.x.ax == 0)
return 0;
// yes, let's do it
writeInfo = (BW_writeInfo_t *) lowmem_buffer;
writeInfo->remoteAddr = bcastaddr;
writeInfo->remotePort = net_hostport;
writeInfo->dataLen = len;
if (len > NET_DATAGRAMSIZE)
Sys_Error ("BW UDP write packet too large: %u\n", len);
Q_memcpy (writeInfo->data, msg, len);
writeInfo->data[len] = 0;
regs.h.ah = 0x40;
regs.x.bx = s;
regs.x.cx = len + sizeof (BW_writeInfo_t);
regs.x.es = regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
if (dos_int86 (0x21)) {
Con_Printf ("BW_Broadcast failed: %u\n", BW_TranslateError (regs.x.ax));
return -1;
}
return len;
}
//=============================================================================
int
BW_Write (int s, byte * msg, int len, struct qsockaddr *to)
{
BW_writeInfo_t *writeInfo;
// ask if we're clear to send
regs.x.ax = 0x4407;
regs.x.bx = s;
dos_int86 (0x21);
if (regs.x.ax == 0)
return 0;
// yes, let's do it
writeInfo = (BW_writeInfo_t *) lowmem_buffer;
writeInfo->remoteAddr = ((struct sockaddr_in *) to)->sin_addr;
writeInfo->remotePort = ntohs (((struct sockaddr_in *) to)->sin_port);
writeInfo->dataLen = len;
if (len > NET_DATAGRAMSIZE)
Sys_Error ("BW UDP write packet too large: %u\n", len);
Q_memcpy (writeInfo->data, msg, len);
writeInfo->data[len] = 0;
regs.h.ah = 0x40;
regs.x.bx = s;
regs.x.cx = len + sizeof (BW_writeInfo_t);
regs.x.es = regs.x.ds = lowmem_bufseg;
regs.x.dx = lowmem_bufoff;
if (dos_int86 (0x21)) {
Con_Printf ("BW_Write failed: %u\n", BW_TranslateError (regs.x.ax));
return -1;
}
return len;
}
//=============================================================================
char *
BW_AddrToString (struct qsockaddr *addr)
{
static char buffer[22];
snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d:%d",
((struct sockaddr_in *) addr)->sin_addr.s_net,
((struct sockaddr_in *) addr)->sin_addr.s_host,
((struct sockaddr_in *) addr)->sin_addr.s_lh,
((struct sockaddr_in *) addr)->sin_addr.s_impno,
ntohs (((struct sockaddr_in *) addr)->sin_port)
);
return buffer;
}
//=============================================================================
int
BW_StringToAddr (char *string, struct qsockaddr *addr)
{
int ha1, ha2, ha3, ha4, hp;
int ipaddr;
sscanf (string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;
addr->sa_family = AF_INET;
((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl (ipaddr);
((struct sockaddr_in *) addr)->sin_port = htons ((short) hp);
return 0;
}
//=============================================================================
int
BW_GetSocketAddr (int socket, struct qsockaddr *addr)
{
regs.x.ax = 0x4402;
regs.x.bx = socket;
regs.x.cx = sizeof (BW_UDPinfo_t);
regs.x.dx = lowmem_bufoff;
regs.x.ds = lowmem_bufseg;
dos_int86 (0x21);
addr->sa_family = AF_INET;
((struct sockaddr_in *) addr)->sin_addr.s_addr =
((BW_UDPinfo_t *) lowmem_buffer)->localAddr.s_addr;
((struct sockaddr_in *) addr)->sin_port =
htons (((BW_UDPinfo_t *) lowmem_buffer)->localPort);
return 0;
}
//=============================================================================
int
BW_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
Q_strcpy (name, BW_AddrToString (addr));
return 0;
}
///=============================================================================
int
BW_GetAddrFromName (char *name, struct qsockaddr *hostaddr)
{
char buff[MAXHOSTNAMELEN];
char *b;
int addr;
int num;
int mask;
int run;
int port;
if (name[0] < '0' || name[0] > '9')
return -1;
buff[0] = '.';
b = buff;
Q_strcpy (buff + 1, name);
if (buff[1] == '.')
b++;
addr = 0;
mask = -1;
while (*b == '.') {
b++;
num = 0;
run = 0;
while (!(*b < '0' || *b > '9')) {
num = num * 10 + *b++ - '0';
if (++run > 3)
return -1;
}
if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
return -1;
if (num < 0 || num > 255)
return -1;
mask <<= 8;
addr = (addr << 8) + num;
}
addr = htonl (addr);
mask = htonl (mask);
if (*b++ == ':')
port = Q_atoi (b);
else
port = net_hostport;
hostaddr->sa_family = AF_INET;
((struct sockaddr_in *) hostaddr)->sin_port = htons ((short) port);
((struct sockaddr_in *) hostaddr)->sin_addr.s_addr =
((ethdevinfo.inetAddr & mask) | addr);
return 0;
}
//=============================================================================
int
BW_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)
{
if (addr1->sa_family != addr2->sa_family)
return -1;
if (((struct sockaddr_in *) addr1)->sin_addr.s_addr !=
((struct sockaddr_in *) addr2)->sin_addr.s_addr)
return -1;
if (((struct sockaddr_in *) addr1)->sin_port !=
((struct sockaddr_in *) addr2)->sin_port)
return 1;
return 0;
}
//=============================================================================
int
BW_GetSocketPort (struct qsockaddr *addr)
{
return ntohs (((struct sockaddr_in *) addr)->sin_port);
}
int
BW_SetSocketPort (struct qsockaddr *addr, int port)
{
((struct sockaddr_in *) addr)->sin_port = htons (port);
return 0;
}
//=============================================================================
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