util.c

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License, version 2 if the
 *   License as published by the Free Software Foundation.
 *
 *   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; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 1d4c3ee70b185ee350bdf5a4c5faf9429ad53007 $
 * @file rlm_lua/util.c
 * @brief Helper Lua land functions.
 *
 * @author Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 *
 * @copyright 2013 The FreeRADIUS Server Project.
 */
RCSID("$Id: 1d4c3ee70b185ee350bdf5a4c5faf9429ad53007 $")
 
#define LOG_PREFIX fr_lua_mctx->inst->name
 
#include <freeradius-devel/server/base.h>
 
#include "config.h"
#include "lua.h"
 
#include <lauxlib.h>
#include <lualib.h>
 
static _Thread_local request_t *fr_lua_request;
static _Thread_local module_ctx_t const *fr_lua_mctx;
 
void fr_lua_util_fr_register(lua_State *L)
{
        /* fr.{} */
        lua_newtable(L);
        lua_setglobal(L, "fr");
        lua_settop(L, 0);
}
 
/** Lua function to output debug messages
 *
 * Lua arguments are one or more strings. Each successive argument will be printed on a new line.
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments)
 */
static int _util_log_debug(lua_State *L)
{
        request_t               *request = fr_lua_request;
        int                     idx;
 
        while ((idx = lua_gettop(L))) {
                char const *msg = lua_tostring(L, idx);
                lua_pop(L, 1);
                if (!msg) continue;
 
                ROPTIONAL(RDEBUG2, DEBUG2, "%s", msg);
        }
 
        return 0;
}
 
/** Lua function to output informational messages
 *
 * Lua arguments are one or more strings. Each successive argument will be printed on a new line.
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments)
 */
static int _util_log_info(lua_State *L)
{
        request_t               *request = fr_lua_request;
        int                     idx;
 
        while ((idx = lua_gettop(L))) {
                char const *msg = lua_tostring(L, idx);
                lua_pop(L, 1);
                if (!msg) continue;
 
                ROPTIONAL(RINFO, INFO, "%s", msg);
        }
 
        return 0;
}
 
 
/** Lua function to output warning messages
 *
 * Lua arguments are one or more strings. Each successive argument will be printed on a new line.
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments)
 */
static int _util_log_warn(lua_State *L)
{
        request_t               *request = fr_lua_request;
        int                     idx;
 
        while ((idx = lua_gettop(L))) {
                char const *msg = lua_tostring(L, idx);
                lua_pop(L, 1);
                if (!msg) continue;
 
                ROPTIONAL(RWARN, WARN, "%s", msg);
        }
 
        return 0;
}
 
/** Lua function to output error messages.
 *
 * Lua arguments are one or more strings. Each successive argument will be printed on a new line.
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments)
 */
static int _util_log_error(lua_State *L)
{
        request_t               *request = fr_lua_request;
        int                     idx;
 
        while ((idx = lua_gettop(L))) {
                char const *msg = lua_tostring(L, idx);
                lua_pop(L, 1);
                if (!msg) continue;
 
                ROPTIONAL(RERROR, ERROR, "%s", msg);
        }
 
        return 0;
}
 
static int _util_log_newindex(UNUSED lua_State *L)
{
        request_t       *request = fr_lua_util_get_request();
 
        RWDEBUG("fr.log.$func() is read-only");
 
        return 1;
}
 
/** Emit a debug log message
 *
 * @param msg   to be printed.
 */
void fr_lua_util_jit_log_debug(char const *msg)
{
        request_t               *request = fr_lua_request;
 
        ROPTIONAL(RDEBUG2, DEBUG2, "%s", msg);
}
 
/** Emit an info log message
 *
 * @param msg   to be printed.
 */
void fr_lua_util_jit_log_info(char const *msg)
{
        request_t               *request = fr_lua_request;
 
        ROPTIONAL(RINFO, INFO, "%s", msg);
}
 
/** Emit a warning log message
 *
 * @param msg   to be printed.
 */
void fr_lua_util_jit_log_warn(char const *msg)
{
        request_t               *request = fr_lua_request;
 
        ROPTIONAL(RWARN, WARN, "%s", msg);
}
 
/** Emit a error log message
 *
 * @param msg   to be printed.
 */
void fr_lua_util_jit_log_error(char const *msg)
{
        request_t               *request = fr_lua_request;
 
        ROPTIONAL(RERROR, ERROR, "%s", msg);
}
 
/** Insert cdefs into the lua environment
 *
 * For LuaJIT using the FFI is significantly faster than the Lua interface.
 * Help people wishing to use the FFI by inserting cdefs for standard functions.
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments).
 */
int fr_lua_util_jit_log_register(lua_State *L)
{
        char const *search_path;
        char *lua_str, *ctx = NULL;
        int ret;
 
        fr_assert(fr_lua_mctx);
 
        search_path = dl_module_search_path();
 
        /*
         *      If the search path contains multiple directories find where the library is.
         */
        if (strchr(search_path, ':')) {
                char *paths, *path, *file, *p;
                ctx = paths = talloc_typed_strdup(NULL, search_path);
                while ((path = strsep(&paths, ":")) != NULL) {
                        p = strrchr(path, '/');
                        if (p && ((p[1] == '\0') || (p[1] == ':'))) *p = '\0';
                        file = talloc_typed_asprintf(ctx, "%s%clibfreeradius-lua%s", path, FR_DIR_SEP, DL_EXTENSION);
                        if (access(file, F_OK) == 0) {
                                search_path = path;
                                break;
                        }
                }
        }
 
        lua_str = talloc_asprintf(NULL, "\
                ffi = require(\"ffi\")\
                ffi.cdef [[\
                        void fr_lua_util_jit_log_debug(char const *msg);\
                        void fr_lua_util_jit_log_info(char const *msg);\
                        void fr_lua_util_jit_log_warn(char const *msg);\
                        void fr_lua_util_jit_log_error(char const *msg);\
                ]]\
                fr_lua = ffi.load(\"%s%clibfreeradius-lua%s\")\
                _fr_log = {}\
                _fr_log.debug = function(msg)\
                        fr_lua.fr_lua_util_jit_log_debug(msg)\
                end\
                _fr_log.info = function(msg)\
                        fr_lua.fr_lua_util_jit_log_info(msg)\
                end\
                _fr_log.warn = function(msg)\
                        fr_lua.fr_lua_util_jit_log_warn(msg)\
                end\
                _fr_log.error = function(msg)\
                        fr_lua.fr_lua_util_jit_log_error(msg)\
                end\
                function _ro_log(table) \
                        return setmetatable({}, { \
                                __index = table,\
                                __newindex = function(table, key, value)\
                                        _fr_log.warn(\"fr.log.$func() is read-only\")\
                                end, \
                                __metatable = false \
                        }); \
                end\
                fr.log = _ro_log(_fr_log)\
                ", search_path, FR_DIR_SEP, DL_EXTENSION);
        ret = luaL_dostring(L, lua_str);
        talloc_free(lua_str);
        TALLOC_FREE(ctx);
        if (ret != 0) {
                ERROR("Failed setting up FFI: %s",
                      lua_gettop(L) ? lua_tostring(L, -1) : "Unknown error");
 
                return -1;
        }
 
        return 0;
}
 
/** Register utililiary functions in the lua environment
 *
 * @param L Lua interpreter.
 * @return 0 (no arguments).
 */
int fr_lua_util_log_register(lua_State *L)
{
        /* fr.{} */
        lua_getglobal(L, "fr");
        luaL_checktype(L, -1, LUA_TTABLE);
 
        /* fr.log.{} */
        lua_newtable(L);
        {
                lua_newtable(L); //__metatable
                {
                        lua_pushvalue(L, -1);
                        lua_setfield(L, -2, "__index");
 
                        lua_pushcfunction(L, _util_log_newindex);
                        lua_setfield(L, -2, "__newindex");
                }
 
                lua_pushcfunction(L, _util_log_debug);
                lua_setfield(L, -2, "debug");
 
                lua_pushcfunction(L, _util_log_info);
                lua_setfield(L, -2, "info");
 
                lua_pushcfunction(L, _util_log_warn);
                lua_setfield(L, -2, "warn");
 
                lua_pushcfunction(L, _util_log_error);
                lua_setfield(L, -2, "error");
        }
 
        lua_setmetatable(L, -2);
        lua_setfield(L, -2, "log");
 
        return 0;
}
 
/** Set the thread local instance
 *
 * @param[in] mctx      all helper and C functions callable from Lua should use.
 */
void fr_lua_util_set_mctx(module_ctx_t const *mctx)
{
        fr_lua_mctx = mctx;
}
 
/** Get the thread local instance
 *
 * @return mctx         all helper and C functions callable from Lua should use.
 */
module_ctx_t const *fr_lua_util_get_mctx(void)
{
        return fr_lua_mctx;
}
 
/** Set the thread local request
 *
 * @param[in] request   all helper and C functions callable from Lua should use.
 */
void fr_lua_util_set_request(request_t *request)
{
        fr_lua_request = request;
}
 
/** Get the thread local request
 *
 * @return request all helper and C functions callable from Lua should use.
 */
request_t *fr_lua_util_get_request(void)
{
        return fr_lua_request;
}