lua: Add wireguard interfacelua/lua

1 files changed, 96 insertions, 1 deletions

diff --git a/lua/common.c b/lua/common.c
index e1d3e98b..230bd272 100644
--- a/lua/common.c
+++ b/lua/common.c
@@ -5,6 +5,7 @@
 #include "conf/conf.h"
 #include "filter/filter.h"
 #include "lua.h"
+#include "sysdep/linux/wireguard.h"
 
 #include <lua.h>
 #include <lualib.h>
@@ -12,6 +13,9 @@
 
 static linpool *lua_lp;
 
+static void lua_pushwgdevice(lua_State *L, wg_device *dev);
+static void lua_pushwgpeer(lua_State *L, wg_peer *peer);
+
 static int luaB_err(lua_State *L) {
   int n = lua_gettop(L);
   if (n != 1)
@@ -60,7 +64,67 @@ static int luaB_trace(lua_State *L) {
   return 0;
 }
 
-#define lua_sett(L, idx, val, what) do { \
+static int luaB_wg_get_device(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n != 1) {
+    log(L_WARN "get_device needs exactly 1 argument");
+    return 0;
+  }
+
+  const char *device_name = lua_tolstring(L, 1, NULL);
+  log(L_WARN "WG: device name %s", device_name);
+  lua_pop(L, 1);
+
+  wg_device *dev = NULL;
+
+  if (wg_get_device(&dev, device_name) < 0) {
+    return luaL_error(L, "Wireguard error opening %s", device_name);
+  }
+
+  log(L_WARN "WG: device %p", dev);
+  lua_pushwgdevice(L, dev);
+  return 1;
+}
+
+static int luaB_wg_device_first_peer(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n != 1) {
+    log(L_WARN "first_peer needs exactly 0 argument");
+    return 0;
+  }
+
+  lua_pushliteral(L, "_internal");
+  lua_gettable(L, 1);
+  if (!lua_isuserdata(L, -1))
+    luaL_error(L, "fatal: bird internal state not found, type %d", lua_type(L, -1));
+
+  wg_device *dev = lua_touserdata(L, -1);
+  lua_pop(L, 1);
+  lua_pushwgpeer(L, dev->first_peer);
+
+  return 1;
+}
+
+static int luaB_wg_peer_next_peer(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n != 1) {
+    log(L_WARN "next_peer needs exactly 0 argument");
+    return 0;
+  }
+
+  lua_pushliteral(L, "_internal");
+  lua_gettable(L, 1);
+  if (!lua_isuserdata(L, -1))
+    luaL_error(L, "fatal: bird internal state not found, type %d", lua_type(L, -1));
+
+  wg_peer *peer = lua_touserdata(L, -1);
+  lua_pop(L, 1);
+  lua_pushwgpeer(L, peer->next_peer);
+
+  return 1;
+}
+
+#define lua_sett(L, idx, val, what) do {	\
   lua_pushstring(L, idx); \
   lua_push##what(L, val); \
   lua_settable(L, -3); \
@@ -73,6 +137,7 @@ static int luaB_trace(lua_State *L) {
 #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_settableeattr(L, idx, val)	    lua_sett(L, idx, val, eattr)
+#define lua_settablewgdevice(L, idx, val)  lua_sett(L, idx, val, wgdevice)
 #define lua_settablevalue(L, idx, val)	    lua_sett(L, idx, val, value)
 
 #define lua_setglobalcfunction(L, n, val)   do { \
@@ -208,6 +273,32 @@ static void lua_pushipaddr(lua_State *L, ip_addr *addr) {
   lua_setmetatable(L, -2);
 }
 
+static void lua_pushwgdevice(lua_State *L, wg_device *dev) {
+  lua_newtable(L);
+  lua_settablelightuserdata(L, "_internal", dev);
+  lua_settablecfunction(L, "first_peer", luaB_wg_device_first_peer);
+
+  lua_newtable(L);
+  lua_settablevalue(L, "__index", -2-1);
+  lua_setmetatable(L, -2);
+}
+
+static void lua_pushwgpeer(lua_State *L, wg_peer *peer) {
+  lua_newtable(L);
+  lua_settablelightuserdata(L, "_internal", peer);
+  lua_settablecfunction(L, "next_peer", luaB_wg_peer_next_peer);
+
+  wg_key_b64_string b64;
+  wg_key_to_base64(b64, peer->public_key);
+  lua_pushliteral(L, "public_key");
+  lua_pushlstring(L, b64, strlen(b64));
+  lua_settable(L, -3);
+
+  lua_newtable(L);
+  lua_settablevalue(L, "__index", -2-1);
+  lua_setmetatable(L, -2);
+}
+
 static void lua_pusheattr(lua_State *L, eattr *ea) {
   /* if (ea->type == EAF_TYPE_IP_ADDRESS) { */
   /*   lua_settableinteger(L, "data", 17); */
@@ -276,6 +367,10 @@ lua_bird_state *luaB_init(lua_State *L, struct linpool *lp) {
   lua_pushcfunction(L, luaB_reject);
   lua_setglobal(L, "reject");
 
+  lua_newtable(L);
+  lua_settablecfunction(L, "get_device", luaB_wg_get_device);
+  lua_setglobal(L, "wireguard");
+
   return lbs;
 }