80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
#include <lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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#include <linux/netlink.h>
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#include <sys/socket.h>
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#include <stdlib.h>
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#include <string.h>
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/* static int l_close_socket(lua_State *L) { */
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/* LStream *p = (LStream *) luaL_checkudata(L, 1, LUA_FILEHANDLE); */
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/* int res = fclose(p->f); */
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/* return luaL_fileresult(L, (res == 0), NULL); */
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/* } */
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static int l_read_from_socket(lua_State *L) {
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/* struct sockaddr_nl sa; */
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/* memset(&sa, 0, sizeof(sa)); */
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int length = 32;
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if(lua_isnumber(L, 2))
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length = lua_tointeger(L, 2);
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lua_getfield(L, 1, "fileno");
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int fd = (int) lua_tointeger(L, -1);
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char *buf = (char *) malloc(length);
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int bytes = recv(fd, buf, length, 0);
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if(bytes > 0) {
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lua_pushlstring(L, buf, bytes);
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free(buf);
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return 1;
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} else {
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free(buf);
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return 0;
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}
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}
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static int l_open_socket(lua_State *L) {
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int netlink_fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT);
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struct sockaddr_nl sa;
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memset(&sa, 0, sizeof(sa));
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sa.nl_family = AF_NETLINK;
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sa.nl_pid = getpid();
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sa.nl_groups = 4; /* rebroadcasts from mdevd */
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if(bind(netlink_fd, (struct sockaddr *) &sa, sizeof(sa))==0) {
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lua_newtable(L);
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lua_pushliteral(L, "fileno");
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lua_pushinteger(L, netlink_fd);
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lua_settable(L, 1);
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lua_pushliteral(L, "read");
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lua_pushcfunction(L, l_read_from_socket);
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lua_settable(L, 1);
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return 1;
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} else {
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return 0;
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}
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}
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static const struct luaL_Reg funcs [] = {
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{"open", l_open_socket},
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{NULL, NULL} /* sentinel */
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};
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/* "luaopen_" prefix is magic and tells lua to run this function
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* when it dlopens the library
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*/
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int luaopen_nellie (lua_State *L) {
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luaL_newlib(L, funcs);
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return 1;
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}
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