1 files changed, 122 insertions, 0 deletions
diff --git a/libs/luci-lib-luaneightbl/src/neightbl.c b/libs/luci-lib-luaneightbl/src/neightbl.c
new file mode 100644
index 0000000000..987ec5e32e
--- /dev/null
+++ b/libs/luci-lib-luaneightbl/src/neightbl.c
@@ -0,0 +1,122 @@
+/*
+License:
+Copyright 2013 Steven Barth <steven@midlink.org>
+
+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.
+*/
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include <linux/rtnetlink.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+#include <netinet/ether.h>
+
+char *ether_ntoa_l (const struct ether_addr *addr, char *buf)
+{
+  sprintf (buf, "%02x:%02x:%02x:%02x:%02x:%02x",
+           addr->ether_addr_octet[0], addr->ether_addr_octet[1],
+           addr->ether_addr_octet[2], addr->ether_addr_octet[3],
+           addr->ether_addr_octet[4], addr->ether_addr_octet[5]);
+  return buf;
+}
+
+static int neightbl_get(lua_State *L) {
+	int sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
+	struct sockaddr_nl kernel = {AF_NETLINK, 0, 0, 0};
+	if (connect(sock, (struct sockaddr*)&kernel, sizeof(kernel)))
+		goto error;
+
+	const char *ifname = luaL_checkstring(L, 1);
+	int ifindex = if_nametoindex(ifname);
+	if (ifindex <= 0)
+		goto error;
+
+	struct {
+		struct nlmsghdr hdr;
+		struct ndmsg ndm;
+	} req = {
+		{sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP, 1, 0},
+		{AF_INET6, 0, 0, ifindex, 0, 0, 0},
+	};
+
+	if (send(sock, &req, sizeof(req), 0) != sizeof(req))
+		goto error;
+
+	lua_newtable(L);
+
+	char buf[8192];
+	struct nlmsghdr *nh = (struct nlmsghdr*)buf;
+	do {
+		ssize_t len = recv(sock, buf, sizeof(buf), 0);
+		if (len < 0) {
+			lua_pop(L, 1);
+			goto error;
+		}
+
+
+		for (;NLMSG_OK(nh, (size_t)len) && nh->nlmsg_type == RTM_NEWNEIGH;
+				nh = NLMSG_NEXT(nh, len)) {
+			struct ndmsg *ndm = NLMSG_DATA(nh);
+			if (NLMSG_PAYLOAD(nh, 0) < sizeof(*ndm) || ndm->ndm_ifindex != ifindex)
+				continue;
+
+			ssize_t alen = NLMSG_PAYLOAD(nh, sizeof(*ndm));
+			char buf[INET6_ADDRSTRLEN] = {0}, *mac = NULL, str_buf[ETH_ALEN];
+			for (struct rtattr *rta = (struct rtattr*)&ndm[1]; RTA_OK(rta, alen);
+					rta = RTA_NEXT(rta, alen)) {
+				if (rta->rta_type == NDA_DST && RTA_PAYLOAD(rta) >= sizeof(struct in6_addr))
+					inet_ntop(AF_INET6, RTA_DATA(rta), buf, sizeof(buf));
+				else if (rta->rta_type == NDA_LLADDR && RTA_PAYLOAD(rta) >= 6)
+					mac = ether_ntoa_l(RTA_DATA(rta),str_buf);
+			}
+
+			if (mac)
+				lua_pushstring(L, mac);
+			else
+				lua_pushboolean(L, false);
+
+			lua_setfield(L, -2, buf);
+		}
+	} while (nh->nlmsg_type == RTM_NEWNEIGH);
+
+	close(sock);
+        return 1;
+
+error:
+	close(sock);
+	lua_pushnil(L);
+	lua_pushinteger(L, errno);
+	lua_pushstring(L, strerror(errno));
+	return 3;
+}
+
+
+static const luaL_reg R[] = {
+        {"get", neightbl_get},
+        {NULL, NULL}
+};
+
+
+int luaopen_neightbl(lua_State *l)
+{
+	luaL_register(l, "neightbl", R);
+	return 1;
+}