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ioef/code/unix/unix_net.c

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
// unix_net.c
#include "../qcommon/q_shared.h"
#include "../qcommon/qcommon.h"
#include <unistd.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h> // bk001204
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <errno.h>
#ifdef MACOS_X
#import <sys/sockio.h>
#import <net/if.h>
#import <net/if_types.h>
#import <arpa/inet.h> // for inet_ntoa()
#import <net/if_dl.h> // for 'struct sockaddr_dl'
#endif
#ifdef __sun
#include <sys/filio.h>
#endif
static cvar_t *noudp;
netadr_t net_local_adr;
int ip_socket;
int ipx_socket;
#define MAX_IPS 16
static int numIP;
static byte localIP[MAX_IPS][4];
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;
}
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;
}
/*
=============
Sys_StringToAdr
idnewt
192.246.40.70
=============
*/
qboolean Sys_StringToSockaddr (const char *s, struct sockaddr *sadr)
{
struct hostent *h;
//char *colon; // bk001204 - unused
memset (sadr, 0, sizeof(*sadr));
((struct sockaddr_in *)sadr)->sin_family = AF_INET;
((struct sockaddr_in *)sadr)->sin_port = 0;
if ( s[0] >= '0' && s[0] <= '9')
{
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = inet_addr(s);
}
else
{
if (! (h = gethostbyname(s)) )
return qfalse;
*(int *)&((struct sockaddr_in *)sadr)->sin_addr = *(int *)h->h_addr_list[0];
}
return qtrue;
}
/*
=============
Sys_StringToAdr
localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean Sys_StringToAdr (const char *s, netadr_t *a)
{
struct sockaddr_in sadr;
if (!Sys_StringToSockaddr (s, (struct sockaddr *)&sadr))
return qfalse;
SockadrToNetadr (&sadr, a);
return qtrue;
}
//=============================================================================
qboolean Sys_GetPacket (netadr_t *net_from, msg_t *net_message)
{
int ret;
struct sockaddr_in from;
socklen_t fromlen;
int net_socket;
int protocol;
int err;
for (protocol = 0 ; protocol < 2 ; protocol++)
{
if (protocol == 0)
net_socket = ip_socket;
else
net_socket = ipx_socket;
if (!net_socket)
continue;
fromlen = sizeof(from);
ret = recvfrom (net_socket, net_message->data, net_message->maxsize
, 0, (struct sockaddr *)&from, &fromlen);
SockadrToNetadr (&from, net_from);
// bk000305: was missing
net_message->readcount = 0;
if (ret == -1)
{
err = errno;
if (err == EWOULDBLOCK || err == ECONNREFUSED)
continue;
Com_Printf ("NET_GetPacket: %s from %s\n", NET_ErrorString(),
NET_AdrToString(*net_from));
continue;
}
if (ret == net_message->maxsize)
{
Com_Printf ("Oversize packet from %s\n", NET_AdrToString (*net_from));
continue;
}
net_message->cursize = ret;
return qtrue;
}
return qfalse;
}
//=============================================================================
void Sys_SendPacket( int length, const void *data, netadr_t to )
{
int ret;
struct sockaddr_in addr;
int net_socket;
if (to.type == NA_BROADCAST)
{
net_socket = ip_socket;
}
else if (to.type == NA_IP)
{
net_socket = ip_socket;
}
else if (to.type == NA_IPX)
{
net_socket = ipx_socket;
}
else if (to.type == NA_BROADCAST_IPX)
{
net_socket = ipx_socket;
}
else {
Com_Error (ERR_FATAL, "NET_SendPacket: bad address type");
return;
}
if (!net_socket)
return;
NetadrToSockadr (&to, &addr);
ret = sendto (net_socket, data, length, 0, (struct sockaddr *)&addr, sizeof(addr) );
if (ret == -1)
{
Com_Printf ("NET_SendPacket ERROR: %s to %s\n", NET_ErrorString(),
NET_AdrToString (to));
}
}
//=============================================================================
/*
==================
Sys_IsLANAddress
LAN clients will have their rate var ignored
==================
*/
qboolean Sys_IsLANAddress (netadr_t adr) {
int i;
if( adr.type == NA_LOOPBACK ) {
return qtrue;
}
if( adr.type == NA_IPX ) {
return qtrue;
}
if( adr.type != NA_IP ) {
return qfalse;
}
// RFC1918:
// 10.0.0.0 - 10.255.255.255 (10/8 prefix)
// 172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
// 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
if(adr.ip[0] == 10)
return qtrue;
if(adr.ip[0] == 172 && (adr.ip[1]&0xf0) == 16)
return qtrue;
if(adr.ip[0] == 192 && adr.ip[1] == 168)
return qtrue;
// the checks below are bogus, aren't they? -- ln
// choose which comparison to use based on the class of the address being tested
// any local adresses of a different class than the address being tested will fail based on the first byte
// Class A
if( (adr.ip[0] & 0x80) == 0x00 ) {
for ( i = 0 ; i < numIP ; i++ ) {
if( adr.ip[0] == localIP[i][0] ) {
return qtrue;
}
}
// the RFC1918 class a block will pass the above test
return qfalse;
}
// Class B
if( (adr.ip[0] & 0xc0) == 0x80 ) {
for ( i = 0 ; i < numIP ; i++ ) {
if( adr.ip[0] == localIP[i][0] && adr.ip[1] == localIP[i][1] ) {
return qtrue;
}
// also check against the RFC1918 class b blocks
if( adr.ip[0] == 172 && localIP[i][0] == 172 && (adr.ip[1] & 0xf0) == 16 && (localIP[i][1] & 0xf0) == 16 ) {
return qtrue;
}
}
return qfalse;
}
// Class C
for ( i = 0 ; i < numIP ; i++ ) {
if( adr.ip[0] == localIP[i][0] && adr.ip[1] == localIP[i][1] && adr.ip[2] == localIP[i][2] ) {
return qtrue;
}
// also check against the RFC1918 class c blocks
if( adr.ip[0] == 192 && localIP[i][0] == 192 && adr.ip[1] == 168 && localIP[i][1] == 168 ) {
return qtrue;
}
}
return qfalse;
}
/*
==================
Sys_ShowIP
==================
*/
void Sys_ShowIP(void) {
int i;
for (i = 0; i < numIP; i++) {
Com_Printf( "IP: %i.%i.%i.%i\n", localIP[i][0], localIP[i][1], localIP[i][2], localIP[i][3] );
}
}
/*
=====================
NET_GetLocalAddress
=====================
*/
#ifdef MACOS_X
// Don't do a forward mapping from the hostname of the machine to the IP.
// The reason is that we might have obtained an IP address from DHCP and
// there might not be any name registered for the machine. On Mac OS X,
// the machine name defaults to 'localhost' and NetInfo has 127.0.0.1
// listed for this name. Instead, we want to get a list of all the IP
// network interfaces on the machine. This code adapted from
// OmniNetworking.
#ifdef _SIZEOF_ADDR_IFREQ
// tjw: OSX 10.4 does not have sa_len
#define IFR_NEXT(ifr) \
((struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr)))
#else
// tjw: assume that once upon a time some version did have sa_len
#define IFR_NEXT(ifr) \
((struct ifreq *) ((char *) (ifr) + sizeof(*(ifr)) + \
MAX(0, (int) (ifr)->ifr_addr.sa_len - (int) sizeof((ifr)->ifr_addr))))
#endif
void NET_GetLocalAddress( void ) {
struct ifreq requestBuffer[MAX_IPS], *linkInterface, *inetInterface;
struct ifconf ifc;
struct ifreq ifr;
struct sockaddr_dl *sdl;
int interfaceSocket;
int family;
Com_Printf("NET_GetLocalAddress: Querying for network interfaces\n");
// Set this early so we can just return if there is an error
numIP = 0;
ifc.ifc_len = sizeof(requestBuffer);
ifc.ifc_buf = (caddr_t)requestBuffer;
// Since we get at this info via an ioctl, we need a temporary little socket.
// This will only get AF_INET interfaces, but we probably don't care about
// anything else. If we do end up caring later, we should add a
// ONAddressFamily and at a -interfaces method to it.
family = AF_INET;
if ((interfaceSocket = socket(family, SOCK_DGRAM, 0)) < 0) {
Com_Printf("NET_GetLocalAddress: Unable to create temporary socket, errno = %d\n", errno);
return;
}
if (ioctl(interfaceSocket, SIOCGIFCONF, &ifc) != 0) {
Com_Printf("NET_GetLocalAddress: Unable to get list of network interfaces, errno = %d\n", errno);
return;
}
linkInterface = (struct ifreq *) ifc.ifc_buf;
while ((char *) linkInterface < &ifc.ifc_buf[ifc.ifc_len]) {
unsigned int nameLength;
// The ioctl returns both the entries having the address (AF_INET)
// and the link layer entries (AF_LINK). The AF_LINK entry has the
// link layer address which contains the interface type. This is the
// only way I can see to get this information. We cannot assume that
// we will get bot an AF_LINK and AF_INET entry since the interface
// may not be configured. For example, if you have a 10Mb port on
// the motherboard and a 100Mb card, you may not configure the
// motherboard port.
// For each AF_LINK entry...
if (linkInterface->ifr_addr.sa_family == AF_LINK) {
// if there is a matching AF_INET entry
inetInterface = (struct ifreq *) ifc.ifc_buf;
while ((char *) inetInterface < &ifc.ifc_buf[ifc.ifc_len]) {
if (inetInterface->ifr_addr.sa_family == AF_INET &&
!strncmp(inetInterface->ifr_name, linkInterface->ifr_name,
sizeof(linkInterface->ifr_name))) {
for (nameLength = 0; nameLength < IFNAMSIZ; nameLength++)
if (!linkInterface->ifr_name[nameLength])
break;
sdl = (struct sockaddr_dl *)&linkInterface->ifr_addr;
// Skip loopback interfaces
if (sdl->sdl_type != IFT_LOOP) {
// Get the local interface address
strncpy(ifr.ifr_name, inetInterface->ifr_name, sizeof(ifr.ifr_name));
if (ioctl(interfaceSocket, OSIOCGIFADDR, (caddr_t)&ifr) < 0) {
Com_Printf("NET_GetLocalAddress: Unable to get local address "
"for interface '%s', errno = %d\n", inetInterface->ifr_name, errno);
} else {
struct sockaddr_in *sin;
int ip;
sin = (struct sockaddr_in *)&ifr.ifr_addr;
ip = ntohl(sin->sin_addr.s_addr);
localIP[ numIP ][0] = (ip >> 24) & 0xff;
localIP[ numIP ][1] = (ip >> 16) & 0xff;
localIP[ numIP ][2] = (ip >> 8) & 0xff;
localIP[ numIP ][3] = (ip >> 0) & 0xff;
Com_Printf( "IP: %i.%i.%i.%i (%s)\n",
localIP[ numIP ][0], localIP[ numIP ][1],
localIP[ numIP ][2], localIP[ numIP ][3],
inetInterface->ifr_name);
numIP++;
}
}
// We will assume that there is only one AF_INET entry per AF_LINK entry.
// What happens when we have an interface that has multiple IP addresses, or
// can that even happen?
// break;
}
inetInterface = IFR_NEXT(inetInterface);
}
}
linkInterface = IFR_NEXT(linkInterface);
}
Com_Printf("NET_GetLocalAddress: DONE querying for network interfaces\n");
close(interfaceSocket);
}
#else
void NET_GetLocalAddress( void ) {
char hostname[256];
struct hostent *hostInfo;
// int error; // bk001204 - unused
char *p;
int ip;
int n;
if ( gethostname( hostname, 256 ) == -1 ) {
return;
}
hostInfo = gethostbyname( hostname );
if ( !hostInfo ) {
return;
}
Com_Printf( "Hostname: %s\n", hostInfo->h_name );
n = 0;
while( ( p = hostInfo->h_aliases[n++] ) != NULL ) {
Com_Printf( "Alias: %s\n", p );
}
if ( hostInfo->h_addrtype != AF_INET ) {
return;
}
numIP = 0;
while( ( p = hostInfo->h_addr_list[numIP++] ) != NULL && numIP < MAX_IPS ) {
ip = ntohl( *(int *)p );
localIP[ numIP ][0] = p[0];
localIP[ numIP ][1] = p[1];
localIP[ numIP ][2] = p[2];
localIP[ numIP ][3] = p[3];
Com_Printf( "IP: %i.%i.%i.%i\n", ( ip >> 24 ) & 0xff, ( ip >> 16 ) & 0xff, ( ip >> 8 ) & 0xff, ip & 0xff );
}
}
#endif
/*
====================
NET_OpenIP
====================
*/
// bk001204 - prototype needed
int NET_IPSocket (char *net_interface, int port);
void NET_OpenIP (void)
{
cvar_t *ip;
int port;
int i;
ip = Cvar_Get ("net_ip", "localhost", 0);
port = Cvar_Get("net_port", va("%i", PORT_SERVER), 0)->value;
for ( i = 0 ; i < 10 ; i++ ) {
ip_socket = NET_IPSocket (ip->string, port + i);
if ( ip_socket ) {
Cvar_SetValue( "net_port", port + i );
NET_GetLocalAddress();
return;
}
}
Com_Error (ERR_FATAL, "Couldn't allocate IP port");
}
/*
====================
NET_Init
====================
*/
void NET_Init (void)
{
noudp = Cvar_Get ("net_noudp", "0", 0);
// open sockets
if (! noudp->value) {
NET_OpenIP ();
}
}
/*
====================
NET_IPSocket
====================
*/
int NET_IPSocket (char *net_interface, int port)
{
int newsocket;
struct sockaddr_in address;
qboolean _qtrue = qtrue;
int i = 1;
if ( net_interface ) {
Com_Printf("Opening IP socket: %s:%i\n", net_interface, port );
} else {
Com_Printf("Opening IP socket: localhost:%i\n", port );
}
if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
Com_Printf ("ERROR: UDP_OpenSocket: socket: %s", NET_ErrorString());
return 0;
}
// make it non-blocking
if (ioctl (newsocket, FIONBIO, &_qtrue) == -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] || !Q_stricmp(net_interface, "localhost"))
address.sin_addr.s_addr = INADDR_ANY;
else
Sys_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)
{
if (ip_socket) {
close(ip_socket);
ip_socket = 0;
}
}
/*
====================
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 qboolean stdin_active;
if (!ip_socket || !com_dedicated->integer)
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_socket, &fdset); // network socket
timeout.tv_sec = msec/1000;
timeout.tv_usec = (msec%1000)*1000;
select(ip_socket+1, &fdset, NULL, NULL, &timeout);
}
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