Import luanet library

Relicensed with author's permission
Thanks John

1 files changed, 171 insertions, 0 deletions

diff --git a/libs/luanet/src/bridge.c b/libs/luanet/src/bridge.c
new file mode 100644
index 0000000000..478f8b14ff
--- /dev/null
+++ b/libs/luanet/src/bridge.c
@@ -0,0 +1,171 @@
+/*
+ *  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;
+}