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/*
* This file defines the lua interface into
* FRRouting.
*
* Copyright (C) 2016-2019 Cumulus Networks, Inc.
* Donald Sharp, Quentin Young
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#if defined(HAVE_LUA)
#include "prefix.h"
#include "frrlua.h"
#include "log.h"
#include "buffer.h"
/*
* FRR convenience functions.
*
* This section has convenience functions used to make interacting with the Lua
* stack easier.
*/
const char *frrlua_table_get_string(lua_State *L, const char *key)
{
const char *str;
lua_pushstring(L, key);
lua_gettable(L, -2);
str = (const char *)lua_tostring(L, -1);
lua_pop(L, 1);
return str;
}
int frrlua_table_get_integer(lua_State *L, const char *key)
{
int result;
lua_pushstring(L, key);
lua_gettable(L, -2);
result = lua_tointeger(L, -1);
lua_pop(L, 1);
return result;
}
/*
* Encoders.
*
* This section has functions that convert internal FRR datatypes into Lua
* datatypes.
*/
void frrlua_newtable_prefix(lua_State *L, const struct prefix *prefix)
{
char buffer[100];
zlog_debug("frrlua: pushing prefix table");
lua_newtable(L);
lua_pushstring(L, prefix2str(prefix, buffer, 100));
lua_setfield(L, -2, "route");
lua_pushinteger(L, prefix->family);
lua_setfield(L, -2, "family");
lua_setglobal(L, "prefix");
}
void frrlua_newtable_interface(lua_State *L, const struct interface *ifp)
{
zlog_debug("frrlua: pushing interface table");
lua_newtable(L);
lua_pushstring(L, ifp->name);
lua_setfield(L, -2, "name");
lua_pushinteger(L, ifp->ifindex);
lua_setfield(L, -2, "ifindex");
lua_pushinteger(L, ifp->status);
lua_setfield(L, -2, "status");
lua_pushinteger(L, ifp->flags);
lua_setfield(L, -2, "flags");
lua_pushinteger(L, ifp->metric);
lua_setfield(L, -2, "metric");
lua_pushinteger(L, ifp->speed);
lua_setfield(L, -2, "speed");
lua_pushinteger(L, ifp->mtu);
lua_setfield(L, -2, "mtu");
lua_pushinteger(L, ifp->mtu6);
lua_setfield(L, -2, "mtu6");
lua_pushinteger(L, ifp->bandwidth);
lua_setfield(L, -2, "bandwidth");
lua_pushinteger(L, ifp->link_ifindex);
lua_setfield(L, -2, "link_ifindex");
lua_pushinteger(L, ifp->ll_type);
lua_setfield(L, -2, "linklayer_type");
}
/*
* Logging.
*
* Lua-compatible wrappers for FRR logging functions.
*/
static const char *frrlua_log_thunk(lua_State *L)
{
int nargs;
nargs = lua_gettop(L);
assert(nargs == 1);
return lua_tostring(L, 1);
}
static int frrlua_log_debug(lua_State *L)
{
zlog_debug("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_info(lua_State *L)
{
zlog_info("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_notice(lua_State *L)
{
zlog_notice("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_warn(lua_State *L)
{
zlog_warn("%s", frrlua_log_thunk(L));
return 0;
}
static int frrlua_log_error(lua_State *L)
{
zlog_err("%s", frrlua_log_thunk(L));
return 0;
}
static const luaL_Reg log_funcs[] = {
{"debug", frrlua_log_debug},
{"info", frrlua_log_info},
{"notice", frrlua_log_notice},
{"warn", frrlua_log_warn},
{"error", frrlua_log_error},
{},
};
void frrlua_export_logging(lua_State *L)
{
lua_newtable(L);
luaL_setfuncs(L, log_funcs, 0);
lua_setfield(L, -2, "log");
}
/*
* Debugging.
*/
char *frrlua_stackdump(lua_State *L)
{
int top = lua_gettop(L);
char tmpbuf[64];
struct buffer *buf = buffer_new(4098);
for (int i = 1; i <= top; i++) {
int t = lua_type(L, i);
switch (t) {
case LUA_TSTRING: /* strings */
snprintf(tmpbuf, sizeof(tmpbuf), "\"%s\"\n",
lua_tostring(L, i));
buffer_putstr(buf, tmpbuf);
break;
case LUA_TBOOLEAN: /* booleans */
snprintf(tmpbuf, sizeof(tmpbuf), "%s\n",
lua_toboolean(L, i) ? "true" : "false");
buffer_putstr(buf, tmpbuf);
break;
case LUA_TNUMBER: /* numbers */
snprintf(tmpbuf, sizeof(tmpbuf), "%g\n",
lua_tonumber(L, i));
buffer_putstr(buf, tmpbuf);
break;
default: /* other values */
snprintf(tmpbuf, sizeof(tmpbuf), "%s\n",
lua_typename(L, t));
buffer_putstr(buf, tmpbuf);
break;
}
}
char *result = XSTRDUP(MTYPE_TMP, buffer_getstr(buf));
buffer_free(buf);
return result;
}
#endif
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