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quakeforge/nq/source/net_udp.c

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/*
net_udp.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
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#ifdef HAVE_WINSOCK_H
# include <winsock.h>
#endif
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef __sun__
#include <sys/filio.h>
#endif
#ifdef NeXT
#include <libc.h>
#endif
#include "compat.h"
#include "QF/cvar.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "QF/console.h"
#include "net.h"
#ifdef _WIN32
# undef EWOULDBLOCK
# define EWOULDBLOCK WSAEWOULDBLOCK
# undef ECONNREFUSED
# define ECONNREFUSED WSAECONNREFUSED
#endif
#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 512
#endif
#ifndef HAVE_SOCKLEN_T
# ifdef HAVE_SIZE
typedef size_t socklen_t;
# else
typedef unsigned int socklen_t;
# endif
#endif
//extern int gethostname (char *, int);
extern int close (int);
static int net_acceptsocket = -1; // socket for fielding new
// connections
static int net_controlsocket;
static int net_broadcastsocket = 0;
static struct qsockaddr broadcastaddr;
static unsigned long myAddr;
#include "net_udp.h"
//=============================================================================
int
UDP_Init (void)
{
struct hostent *local;
char buff[MAXHOSTNAMELEN];
struct qsockaddr addr;
char *colon;
if (COM_CheckParm ("-noudp"))
return -1;
// determine my name & address
gethostname (buff, MAXHOSTNAMELEN);
local = gethostbyname (buff);
myAddr = *(int *) local->h_addr_list[0];
// if the quake hostname isn't set, set it to the machine name
if (strcmp (hostname->string, "UNNAMED") == 0) {
buff[15] = 0;
Cvar_Set (hostname, buff);
}
if ((net_controlsocket = UDP_OpenSocket (0)) == -1)
Sys_Error ("UDP_Init: Unable to open control socket\n");
((struct sockaddr_in *) &broadcastaddr)->sin_family = AF_INET;
((struct sockaddr_in *) &broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST;
((struct sockaddr_in *) &broadcastaddr)->sin_port = htons (net_hostport);
UDP_GetSocketAddr (net_controlsocket, &addr);
strcpy (my_tcpip_address, UDP_AddrToString (&addr));
colon = strrchr (my_tcpip_address, ':');
if (colon)
*colon = 0;
Con_Printf ("UDP Initialized\n");
tcpipAvailable = true;
return net_controlsocket;
}
//=============================================================================
void
UDP_Shutdown (void)
{
UDP_Listen (false);
UDP_CloseSocket (net_controlsocket);
}
//=============================================================================
void
UDP_Listen (qboolean state)
{
// enable listening
if (state) {
if (net_acceptsocket != -1)
return;
if ((net_acceptsocket = UDP_OpenSocket (net_hostport)) == -1)
Sys_Error ("UDP_Listen: Unable to open accept socket\n");
return;
}
// disable listening
if (net_acceptsocket == -1)
return;
UDP_CloseSocket (net_acceptsocket);
net_acceptsocket = -1;
}
//=============================================================================
int
UDP_OpenSocket (int port)
{
int newsocket;
struct sockaddr_in address;
#ifdef _WIN32
#define ioctl ioctlsocket
unsigned long _true = true;
#else
int _true = true;
#endif
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
return -1;
if (ioctl (newsocket, FIONBIO, &_true) == -1)
goto ErrorReturn;
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons (port);
if (bind (newsocket, (void *) &address, sizeof (address)) == -1)
goto ErrorReturn;
return newsocket;
ErrorReturn:
close (newsocket);
return -1;
}
//=============================================================================
int
UDP_CloseSocket (int socket)
{
if (socket == net_broadcastsocket)
net_broadcastsocket = 0;
return close (socket);
}
//=============================================================================
/*
============
PartialIPAddress
this lets you type only as much of the net address as required, using
the local network components to fill in the rest
============
*/
static int
PartialIPAddress (char *in, struct qsockaddr *hostaddr)
{
char buff[256];
char *b;
int addr;
int num;
int mask;
int run;
int port;
buff[0] = '.';
b = buff;
strcpy (buff + 1, in);
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;
}
if (*b++ == ':')
port = 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 =
(myAddr & htonl (mask)) | htonl (addr);
return 0;
}
//=============================================================================
int
UDP_Connect (int socket, struct qsockaddr *addr)
{
return 0;
}
//=============================================================================
int
UDP_CheckNewConnections (void)
{
unsigned long available;
struct sockaddr_in from;
socklen_t fromlen;
char buff[1];
if (net_acceptsocket == -1)
return -1;
if (ioctl (net_acceptsocket, FIONREAD, &available) == -1)
Sys_Error ("UDP: ioctlsocket (FIONREAD) failed\n");
if (available)
return net_acceptsocket;
recvfrom (net_acceptsocket, buff, 0, 0, (struct sockaddr *) &from,
&fromlen);
return -1;
}
//=============================================================================
int
UDP_Read (int socket, byte * buf, int len, struct qsockaddr *addr)
{
int addrlen = sizeof (struct qsockaddr);
int ret;
ret = recvfrom (socket, buf, len, 0, (struct sockaddr *) addr, &addrlen);
if (ret == -1 && (errno == EWOULDBLOCK || errno == ECONNREFUSED))
return 0;
return ret;
}
//=============================================================================
int
UDP_MakeSocketBroadcastCapable (int socket)
{
int i = 1;
// make this socket broadcast capable
if (setsockopt (socket, SOL_SOCKET, SO_BROADCAST, (char *) &i, sizeof (i)) <
0) return -1;
net_broadcastsocket = socket;
return 0;
}
//=============================================================================
int
UDP_Broadcast (int socket, byte * buf, int len)
{
int ret;
if (socket != net_broadcastsocket) {
if (net_broadcastsocket != 0)
Sys_Error ("Attempted to use multiple broadcasts sockets\n");
ret = UDP_MakeSocketBroadcastCapable (socket);
if (ret == -1) {
Con_Printf ("Unable to make socket broadcast capable\n");
return ret;
}
}
return UDP_Write (socket, buf, len, &broadcastaddr);
}
//=============================================================================
int
UDP_Write (int socket, byte * buf, int len, struct qsockaddr *addr)
{
int ret;
ret =
sendto (socket, buf, len, 0, (struct sockaddr *) addr,
sizeof (struct qsockaddr));
if (ret == -1 && errno == EWOULDBLOCK)
return 0;
return ret;
}
//=============================================================================
char *
UDP_AddrToString (struct qsockaddr *addr)
{
static char buffer[22];
int haddr;
haddr = ntohl (((struct sockaddr_in *) addr)->sin_addr.s_addr);
snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff,
(haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff,
ntohs (((struct sockaddr_in *) addr)->sin_port));
return buffer;
}
//=============================================================================
int
UDP_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 (hp);
return 0;
}
//=============================================================================
int
UDP_GetSocketAddr (int socket, struct qsockaddr *addr)
{
int addrlen = sizeof (struct qsockaddr);
unsigned int a;
memset (addr, 0, sizeof (struct qsockaddr));
getsockname (socket, (struct sockaddr *) addr, &addrlen);
a = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
if (a == 0 || a == inet_addr ("127.0.0.1"))
((struct sockaddr_in *) addr)->sin_addr.s_addr = myAddr;
return 0;
}
//=============================================================================
int
UDP_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
struct hostent *hostentry;
hostentry =
gethostbyaddr ((char *) &((struct sockaddr_in *) addr)->sin_addr,
sizeof (struct in_addr), AF_INET);
if (hostentry) {
strncpy (name, (char *) hostentry->h_name, NET_NAMELEN - 1);
return 0;
}
strcpy (name, UDP_AddrToString (addr));
return 0;
}
//=============================================================================
int
UDP_GetAddrFromName (char *name, struct qsockaddr *addr)
{
struct hostent *hostentry;
if (name[0] >= '0' && name[0] <= '9')
return PartialIPAddress (name, addr);
hostentry = gethostbyname (name);
if (!hostentry)
return -1;
addr->sa_family = AF_INET;
((struct sockaddr_in *) addr)->sin_port = htons (net_hostport);
((struct sockaddr_in *) addr)->sin_addr.s_addr =
*(int *) hostentry->h_addr_list[0];
return 0;
}
//=============================================================================
int
UDP_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
UDP_GetSocketPort (struct qsockaddr *addr)
{
return ntohs (((struct sockaddr_in *) addr)->sin_port);
}
int
UDP_SetSocketPort (struct qsockaddr *addr, int port)
{
((struct sockaddr_in *) addr)->sin_port = htons (port);
return 0;
}
//=============================================================================
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