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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2008 John Crispin <blogic@openwrt.org>
* Copyright (C) 2008 Steven Barth <steven@midlink.org>
*/
#include <string.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
static int sock_bridge = 0;
int bridge_startup()
{
if(!sock_bridge)
sock_bridge = socket(AF_LOCAL, SOCK_STREAM, 0);
return sock_bridge;
}
void bridge_shutdown(void)
{
if(!sock_bridge)
return;
close(sock_bridge);
sock_bridge = 0;
}
static inline int _bridge_new(lua_State *L, int i)
{
char *ifname;
if(lua_gettop(L) != 1)
{
lua_pushstring(L, "invalid arg list");
lua_error(L);
return 0;
}
ifname = (char *)lua_tostring (L, 1);
if(!ioctl(sock_bridge, i, ifname))
lua_pushboolean(L, 1);
else
lua_pushboolean(L, 0);
return 1;
}
int bridge_new(lua_State *L)
{
return _bridge_new(L, SIOCBRADDBR);
}
int bridge_del(lua_State *L)
{
return _bridge_new(L, SIOCBRDELBR);
}
static inline int _bridge_addif(lua_State *L, int i)
{
struct ifreq ifr;
char *br, *ifname;
if(lua_gettop(L) != 2)
{
lua_pushstring(L, "invalid arg list");
lua_error(L);
return 0;
}
br = (char *)lua_tostring (L, 1);
ifname = (char *)lua_tostring (L, 2);
strncpy(ifr.ifr_name, br, IFNAMSIZ);
ifr.ifr_ifindex = if_nametoindex(ifname);
if(ifr.ifr_ifindex == 0)
{
lua_pushboolean(L, 0);
return 1;
}
if(!ioctl(sock_bridge, i, &ifr))
lua_pushboolean(L, 1);
else
lua_pushboolean(L, 0);
return 1;
}
int bridge_addif(lua_State *L)
{
return _bridge_addif(L, SIOCBRADDIF);
}
int bridge_delif(lua_State *L)
{
return _bridge_addif(L, SIOCBRDELIF);
}
#define SYSFS_PATH_MAX 512
#define SYSFS_CLASS_NET "/sys/class/net/"
static int isbridge(const struct dirent *entry)
{
char path[SYSFS_PATH_MAX];
struct stat st;
snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/bridge", entry->d_name);
return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
}
static int isdev(const struct dirent *entry)
{
if(*entry->d_name == '.')
return 0;
return 1;
}
static inline void bridge_getifs(lua_State *L, const char *ifname)
{
struct dirent **namelist;
int i, count = 0;
char path[SYSFS_PATH_MAX];
snprintf(path, SYSFS_PATH_MAX, SYSFS_CLASS_NET "%s/brif", ifname);
count = scandir(path, &namelist, isdev, alphasort);
if(count < 0)
return;
for(i = 0; i < count; i++)
{
lua_pushinteger(L, i + 1);
lua_pushstring(L, namelist[i]->d_name);
lua_settable(L, -3);
free(namelist[i]);
}
free(namelist);
return;
}
int bridge_getall(lua_State *L)
{
struct dirent **namelist;
int i, count = 0;
count = scandir(SYSFS_CLASS_NET, &namelist, isbridge, alphasort);
if (count < 0)
return 0;
lua_newtable(L);
for (i = 0; i < count; i++)
{
lua_pushstring(L, namelist[i]->d_name);
lua_newtable(L);
bridge_getifs(L, namelist[i]->d_name);
free(namelist[i]);
lua_settable(L, -3);
}
free(namelist);
return 1;
}
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