ref: 710f779fdacf57a6311c62c6e29a5e8e18576c3f
dir: /plan9/net_udp.c/
// net_wins.c
#include "../qcommon/qcommon.h"
#include <unistd.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <errno.h>
#ifdef NeXT
#include <libc.h>
#endif
netadr_t net_local_adr;
#define LOOPBACK 0x7f000001
#define MAX_LOOPBACK 4
typedef struct
{
byte data[MAX_MSGLEN];
int datalen;
} loopmsg_t;
typedef struct
{
loopmsg_t msgs[MAX_LOOPBACK];
int get, send;
} loopback_t;
loopback_t loopbacks[2];
int ip_sockets[2];
int ipx_sockets[2];
int NET_Socket (char *net_interface, int port);
char *NET_ErrorString (void);
//=============================================================================
void NetadrToSockadr (netadr_t *a, struct sockaddr_in *s)
{
memset (s, 0, sizeof(*s));
if (a->type == NA_BROADCAST)
{
s->sin_family = AF_INET;
s->sin_port = a->port;
*(int *)&s->sin_addr = -1;
}
else if (a->type == NA_IP)
{
s->sin_family = AF_INET;
*(int *)&s->sin_addr = *(int *)&a->ip;
s->sin_port = a->port;
}
}
void SockadrToNetadr (struct sockaddr_in *s, netadr_t *a)
{
*(int *)&a->ip = *(int *)&s->sin_addr;
a->port = s->sin_port;
a->type = NA_IP;
}
qboolean NET_CompareAdr (netadr_t a, netadr_t b)
{
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] && a.port == b.port)
return true;
return false;
}
/*
===================
NET_CompareBaseAdr
Compares without the port
===================
*/
qboolean NET_CompareBaseAdr (netadr_t a, netadr_t b)
{
if (a.type != b.type)
return false;
if (a.type == NA_LOOPBACK)
return true;
if (a.type == NA_IP)
{
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3])
return true;
return false;
}
if (a.type == NA_IPX)
{
if ((memcmp(a.ipx, b.ipx, 10) == 0))
return true;
return false;
}
}
char *NET_AdrToString (netadr_t a)
{
static char s[64];
Com_sprintf (s, sizeof(s), "%i.%i.%i.%i:%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3], ntohs(a.port));
return s;
}
char *NET_BaseAdrToString (netadr_t a)
{
static char s[64];
Com_sprintf (s, sizeof(s), "%i.%i.%i.%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3]);
return s;
}
/*
=============
NET_StringToAdr
localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean NET_StringToSockaddr (char *s, struct sockaddr *sadr)
{
struct hostent *h;
char *colon;
char copy[128];
memset (sadr, 0, sizeof(*sadr));
((struct sockaddr_in *)sadr)->sin_family = AF_INET;
((struct sockaddr_in *)sadr)->sin_port = 0;
strcpy (copy, s);
// strip off a trailing :port if present
for (colon = copy ; *colon ; colon++)
if (*colon == ':')
{
*colon = 0;
((struct sockaddr_in *)sadr)->sin_port = htons((short)atoi(colon+1));
}
if (copy[0] >= '0' && copy[0] <= '9')
{
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = inet_addr(copy);
}
else
{
if (! (h = gethostbyname(copy)) )
return 0;
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = *(int *)h->h_addr_list[0];
}
return true;
}
/*
=============
NET_StringToAdr
localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean NET_StringToAdr (char *s, netadr_t *a)
{
struct sockaddr_in sadr;
if (!strcmp (s, "localhost"))
{
memset (a, 0, sizeof(*a));
a->type = NA_LOOPBACK;
return true;
}
if (!NET_StringToSockaddr (s, (struct sockaddr *)&sadr))
return false;
SockadrToNetadr (&sadr, a);
return true;
}
qboolean NET_IsLocalAddress (netadr_t adr)
{
return NET_CompareAdr (adr, net_local_adr);
}
/*
=============================================================================
LOOPBACK BUFFERS FOR LOCAL PLAYER
=============================================================================
*/
qboolean NET_GetLoopPacket (netsrc_t sock, netadr_t *net_from, sizebuf_t *net_message)
{
int i;
loopback_t *loop;
loop = &loopbacks[sock];
if (loop->send - loop->get > MAX_LOOPBACK)
loop->get = loop->send - MAX_LOOPBACK;
if (loop->get >= loop->send)
return false;
i = loop->get & (MAX_LOOPBACK-1);
loop->get++;
memcpy (net_message->data, loop->msgs[i].data, loop->msgs[i].datalen);
net_message->cursize = loop->msgs[i].datalen;
*net_from = net_local_adr;
return true;
}
void NET_SendLoopPacket (netsrc_t sock, int length, void *data, netadr_t to)
{
int i;
loopback_t *loop;
loop = &loopbacks[sock^1];
i = loop->send & (MAX_LOOPBACK-1);
loop->send++;
memcpy (loop->msgs[i].data, data, length);
loop->msgs[i].datalen = length;
}
//=============================================================================
qboolean NET_GetPacket (netsrc_t sock, netadr_t *net_from, sizebuf_t *net_message)
{
int ret;
struct sockaddr_in from;
int fromlen;
int net_socket;
int protocol;
int err;
if (NET_GetLoopPacket (sock, net_from, net_message))
return true;
for (protocol = 0 ; protocol < 2 ; protocol++)
{
if (protocol == 0)
net_socket = ip_sockets[sock];
else
net_socket = ipx_sockets[sock];
if (!net_socket)
continue;
fromlen = sizeof(from);
ret = recvfrom (net_socket, net_message->data, net_message->maxsize
, 0, (struct sockaddr *)&from, &fromlen);
if (ret == -1)
{
err = errno;
if (err == EWOULDBLOCK || err == ECONNREFUSED)
continue;
Com_Printf ("NET_GetPacket: %s", NET_ErrorString());
continue;
}
if (ret == net_message->maxsize)
{
Com_Printf ("Oversize packet from %s\n", NET_AdrToString (*net_from));
continue;
}
net_message->cursize = ret;
SockadrToNetadr (&from, net_from);
return true;
}
return false;
}
//=============================================================================
void NET_SendPacket (netsrc_t sock, int length, void *data, netadr_t to)
{
int ret;
struct sockaddr_in addr;
int net_socket;
if ( to.type == NA_LOOPBACK )
{
NET_SendLoopPacket (sock, length, data, to);
return;
}
if (to.type == NA_BROADCAST)
{
net_socket = ip_sockets[sock];
if (!net_socket)
return;
}
else if (to.type == NA_IP)
{
net_socket = ip_sockets[sock];
if (!net_socket)
return;
}
else if (to.type == NA_IPX)
{
net_socket = ipx_sockets[sock];
if (!net_socket)
return;
}
else if (to.type == NA_BROADCAST_IPX)
{
net_socket = ipx_sockets[sock];
if (!net_socket)
return;
}
else
Com_Error (ERR_FATAL, "NET_SendPacket: bad address type");
NetadrToSockadr (&to, &addr);
ret = sendto (net_socket, data, length, 0, (struct sockaddr *)&addr, sizeof(addr) );
if (ret == -1)
{
Com_Printf ("NET_SendPacket ERROR: %i\n", NET_ErrorString());
}
}
//=============================================================================
/*
====================
NET_OpenIP
====================
*/
void NET_OpenIP (void)
{
cvar_t *port, *ip;
port = Cvar_Get ("port", va("%i", PORT_SERVER), CVAR_NOSET);
ip = Cvar_Get ("ip", "localhost", CVAR_NOSET);
if (!ip_sockets[NS_SERVER])
ip_sockets[NS_SERVER] = NET_Socket (ip->string, port->value);
if (!ip_sockets[NS_CLIENT])
ip_sockets[NS_CLIENT] = NET_Socket (ip->string, PORT_ANY);
}
/*
====================
NET_OpenIPX
====================
*/
void NET_OpenIPX (void)
{
}
/*
====================
NET_Config
A single player game will only use the loopback code
====================
*/
void NET_Config (qboolean multiplayer)
{
int i;
if (!multiplayer)
{ // shut down any existing sockets
for (i=0 ; i<2 ; i++)
{
if (ip_sockets[i])
{
close (ip_sockets[i]);
ip_sockets[i] = 0;
}
if (ipx_sockets[i])
{
close (ipx_sockets[i]);
ipx_sockets[i] = 0;
}
}
}
else
{ // open sockets
NET_OpenIP ();
NET_OpenIPX ();
}
}
//===================================================================
/*
====================
NET_Init
====================
*/
void NET_Init (void)
{
}
/*
====================
NET_Socket
====================
*/
int NET_Socket (char *net_interface, int port)
{
int newsocket;
struct sockaddr_in address;
qboolean _true = true;
int i = 1;
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
Com_Printf ("ERROR: UDP_OpenSocket: socket:", NET_ErrorString());
return 0;
}
// make it non-blocking
if (ioctl (newsocket, FIONBIO, &_true) == -1)
{
Com_Printf ("ERROR: UDP_OpenSocket: ioctl FIONBIO:%s\n", NET_ErrorString());
return 0;
}
// make it broadcast capable
if (setsockopt(newsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) == -1)
{
Com_Printf ("ERROR: UDP_OpenSocket: setsockopt SO_BROADCAST:%s\n", NET_ErrorString());
return 0;
}
if (!net_interface || !net_interface[0] || !stricmp(net_interface, "localhost"))
address.sin_addr.s_addr = INADDR_ANY;
else
NET_StringToSockaddr (net_interface, (struct sockaddr *)&address);
if (port == PORT_ANY)
address.sin_port = 0;
else
address.sin_port = htons((short)port);
address.sin_family = AF_INET;
if( bind (newsocket, (void *)&address, sizeof(address)) == -1)
{
Com_Printf ("ERROR: UDP_OpenSocket: bind: %s\n", NET_ErrorString());
close (newsocket);
return 0;
}
return newsocket;
}
/*
====================
NET_Shutdown
====================
*/
void NET_Shutdown (void)
{
NET_Config (false); // close sockets
}
/*
====================
NET_ErrorString
====================
*/
char *NET_ErrorString (void)
{
int code;
code = errno;
return strerror (code);
}
// sleeps msec or until net socket is ready
void NET_Sleep(int msec)
{
struct timeval timeout;
fd_set fdset;
extern cvar_t *dedicated;
extern qboolean stdin_active;
if (!ip_sockets[NS_SERVER] || (dedicated && !dedicated->value))
return; // we're not a server, just run full speed
FD_ZERO(&fdset);
if (stdin_active)
FD_SET(0, &fdset); // stdin is processed too
FD_SET(ip_sockets[NS_SERVER], &fdset); // network socket
timeout.tv_sec = msec/1000;
timeout.tv_usec = (msec%1000)*1000;
select(ip_sockets[NS_SERVER]+1, &fdset, NULL, NULL, &timeout);
}