ref: 8723be0d01ab4150ed6ca63649a6ec1ddcc06efb
dir: /net_udp.c/
/*
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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// net_udp.c
#include "quakedef.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef __sun__
#include <sys/filio.h>
#endif
#ifdef NeXT
#include <libc.h>
#endif
extern int gethostname (char *, int);
extern int close (int);
extern cvar_t hostname;
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 (Q_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);
Q_strcpy(my_tcpip_address, UDP_AddrToString (&addr));
colon = Q_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;
qboolean _true = true;
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
return -1;
if (ioctl (newsocket, FIONBIO, (char *)&_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 = 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 = (myAddr & htonl(mask)) | htonl(addr);
return 0;
}
//=============================================================================
int UDP_Connect (int socket, struct qsockaddr *addr)
{
return 0;
}
//=============================================================================
int UDP_CheckNewConnections (void)
{
unsigned long available;
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;
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);
sprintf(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;
Q_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)
{
Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);
return 0;
}
Q_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;
}
//=============================================================================