diff options
| -rw-r--r-- | contrib/package/luci/Makefile | 1 | ||||
| -rw-r--r-- | libs/luaneightbl/Makefile | 24 | ||||
| -rw-r--r-- | libs/luaneightbl/src/neightbl.c | 122 |
3 files changed, 147 insertions, 0 deletions
diff --git a/contrib/package/luci/Makefile b/contrib/package/luci/Makefile index 6be79a96b7..05c5542098 100644 --- a/contrib/package/luci/Makefile +++ b/contrib/package/luci/Makefile @@ -168,6 +168,7 @@ $(eval $(call library,nixio,NIXIO POSIX library,+PACKAGE_luci-lib-nixio_openssl: $(eval $(call library,px5g,RSA/X.509 Key Generator (required for LuCId SSL support),+luci-lib-nixio)) $(eval $(call library,sys,LuCI Linux/POSIX system library)) $(eval $(call library,web,MVC Webframework,+luci-lib-sys +luci-lib-nixio +luci-lib-core +luci-sgi-cgi)) +$(eval $(call library,luaneightbl,neightbl - Lua lib for IPv6 neighbors,+luci-lib-core)) ### Protocols ### diff --git a/libs/luaneightbl/Makefile b/libs/luaneightbl/Makefile new file mode 100644 index 0000000000..dc2db6740f --- /dev/null +++ b/libs/luaneightbl/Makefile @@ -0,0 +1,24 @@ +ifneq (,$(wildcard ../../build/config.mk)) +include ../../build/config.mk +include ../../build/module.mk +include ../../build/gccconfig.mk +else +include standalone.mk +endif + +NEIGHTBL_CFLAGS = $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) $(WFLAGS) + +NEIGHTBL_OBJ = src/neightbl.o +NEIGHTBL_LIB = src/neightbl.so + +%.o: %.c + $(CC) $(NEIGHTBL_CFLAGS) $(LUA_CFLAGS) $(FPIC) -c -o $@ $< + +compile: $(NEIGHTBL_OBJ) + $(LINK) $(SHLIB_FLAGS) -o $(NEIGHTBL_LIB) $(NEIGHTBL_OBJ) + mkdir -p dist$(LUA_LIBRARYDIR) + cp $(NEIGHTBL_LIB) dist$(LUA_LIBRARYDIR)/ + +clean: luaclean + rm -f src/*.o src/*.so src/*.a src/*.dll + diff --git a/libs/luaneightbl/src/neightbl.c b/libs/luaneightbl/src/neightbl.c new file mode 100644 index 0000000000..987ec5e32e --- /dev/null +++ b/libs/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; +} |