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#include "nest/bird.h"
#include "conf/conf.h"
#include "filter/filter.h"
#include "lua.h"
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
static int luaB_err(lua_State *L) {
int n = lua_gettop(L);
if (n != 1)
log(L_WARN "bird.err() accepts exactly 1 argument");
if (n < 1)
return 0;
log(L_ERR "%s", lua_tostring(L, 1));
return 0;
}
static int luaB_warn(lua_State *L) {
int n = lua_gettop(L);
if (n != 1)
log(L_WARN "bird.warn() accepts exactly 1 argument");
if (n < 1)
return 0;
log(L_WARN "%s", lua_tostring(L, 1));
return 0;
}
static int luaB_info(lua_State *L) {
int n = lua_gettop(L);
if (n != 1)
log(L_WARN "bird.info() accepts exactly 1 argument");
if (n < 1)
return 0;
log(L_INFO "%s", lua_tostring(L, 1));
return 0;
}
static int luaB_trace(lua_State *L) {
int n = lua_gettop(L);
if (n != 1)
log(L_WARN "bird.trace() accepts exactly 1 argument");
if (n < 1)
return 0;
log(L_TRACE "%s", lua_tostring(L, 1));
return 0;
}
#define lua_sett(L, idx, val, what) do { \
lua_pushstring(L, idx); \
lua_push##what(L, val); \
lua_settable(L, -3); \
} while (0)
#define lua_settablecfunction(L, idx, val) lua_sett(L, idx, val, cfunction)
#define lua_settableinteger(L, idx, val) lua_sett(L, idx, val, integer)
#define lua_settableip4(L, idx, val) lua_sett(L, idx, val, ip4)
#define lua_settablelightuserdata(L, idx, val) lua_sett(L, idx, val, lightuserdata)
#define lua_setglobalcfunction(L, n, val) do { \
lua_pushcfunction(L, val); \
lua_setglobal(L, n); \
} while (0)
static int luaB_generic_concat(lua_State *L) {
int n = lua_gettop(L);
if (n != 2) {
log(L_WARN "__concat needs exactly 2 arguments");
return 0;
}
const char *a, *b;
size_t la, lb;
a = luaL_tolstring(L, 1, &la);
b = luaL_tolstring(L, 2, &lb);
if (a == NULL) {
a = "";
la = 0;
}
if (b == NULL) {
b = "";
lb = 0;
}
char *c = alloca(la + lb + 1);
memcpy(c, a, la);
memcpy(c + la, b, lb);
c[la + lb] = 0;
lua_pushlstring(L, c, la + lb);
return 1;
}
static int luaB_ip4_tostring(lua_State *L) {
int n = lua_gettop(L);
if (n != 1) {
log(L_WARN "__tostring needs exactly 1 argument");
return 0;
}
lua_pushliteral(L, "addr");
lua_gettable(L, 1);
lua_Integer a = lua_tointeger(L, -1);
char c[IP4_MAX_TEXT_LENGTH];
bsnprintf(c, IP4_MAX_TEXT_LENGTH, "%I4", a);
lua_pushstring(L, c);
return 1;
}
static void lua_puship4(lua_State *L, ip4_addr a) {
lua_newtable(L);
lua_settableinteger(L, "addr", ip4_to_u32(a));
lua_newtable(L);
lua_settablecfunction(L, "__tostring", luaB_ip4_tostring);
lua_settablecfunction(L, "__concat", luaB_generic_concat);
lua_setmetatable(L, -2);
}
static lua_bird_state *luaB_getinternalstate(lua_State *L) {
lua_getglobal(L, "bird");
lua_pushstring(L, "_internal_state");
lua_gettable(L, -2);
if (!lua_isuserdata(L, -1))
luaL_error(L, "fatal: bird internal state not found, type %d", lua_type(L, -1));
lua_bird_state *lbs = lua_touserdata(L, -1);
lua_pop(L, 2); /* Pop the user data and then the table. The string is consumed by gettable(). */
return lbs;
}
static int luaB_global_exception(lua_State *L, int value) {
int n = lua_gettop(L);
if (n > 1)
log(L_WARN "Called exception with too many arguments.");
lua_bird_state *lbs = luaB_getinternalstate(L);
lbs->exception = value;
lua_error(L);
return 0;
}
static inline int luaB_accept(lua_State *L) { return luaB_global_exception(L, F_ACCEPT); }
static inline int luaB_reject(lua_State *L) { return luaB_global_exception(L, F_REJECT); }
lua_bird_state *luaB_init(lua_State *L, struct linpool *lp) {
lua_newtable(L);
lua_settablecfunction(L, "err", luaB_err);
lua_settablecfunction(L, "warn", luaB_warn);
lua_settablecfunction(L, "info", luaB_info);
lua_settablecfunction(L, "trace", luaB_trace);
lua_bird_state *lbs = lp_allocz(lp, sizeof(lua_bird_state));
lua_settablelightuserdata(L, "_internal_state", lbs);
lua_settableip4(L, "router_id", ip4_from_u32(config->router_id));
lua_setglobal(L, "bird");
lua_pushcfunction(L, luaB_accept);
lua_setglobal(L, "accept");
lua_pushcfunction(L, luaB_reject);
lua_setglobal(L, "reject");
return lbs;
}
void luaB_push_route(lua_State *L, struct rte *e) {
}
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