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/*
* Copyright (c) 2009, Rambler media
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY Rambler media ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Rambler BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "lua_common.h"
/*
* This is implementation of lua routines to handle config file params
*/
/* Check element with specified name in list, and append it to list if no element with such name was found */
static void
lua_check_element (memory_pool_t *pool, const gchar *name, GList **options, struct module_opt **opt)
{
struct module_opt *cur;
GList *cur_opt;
gboolean found = FALSE;
cur_opt = *options;
while (cur_opt) {
cur = cur_opt->data;
if (g_ascii_strcasecmp (cur->param, name) == 0) {
found = TRUE;
break;
}
cur_opt = g_list_next (cur_opt);
}
if (found) {
*opt = cur;
cur->is_lua = TRUE;
}
else {
/* New option */
*opt = memory_pool_alloc0 (pool, sizeof (struct module_opt));
(*opt)->is_lua = TRUE;
(*opt)->param = memory_pool_strdup (pool, name);
*options = g_list_prepend (*options, *opt);
}
}
/* Process a single item in 'config' table */
static void
lua_process_module (lua_State *L, const gchar *param, struct config_file *cfg)
{
GList *cur_opt;
struct module_opt *cur;
const gchar *name;
gboolean new_module = FALSE;
/* Get module opt structure */
if ((cur_opt = g_hash_table_lookup (cfg->modules_opts, param)) == NULL) {
new_module = TRUE;
}
/* Now iterate throught module table */
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
/* key - -2, value - -1 */
name = luaL_checkstring (L, -2);
if (name != NULL) {
lua_check_element (cfg->cfg_pool, name, &cur_opt, &cur);
lua_process_element (cfg, name, cur, -1);
g_hash_table_insert (cfg->modules_opts, (gpointer)param, cur_opt);
}
}
if (new_module && cur_opt != NULL) {
/* Insert new list into a hash */
g_hash_table_insert (cfg->modules_opts, memory_pool_strdup (cfg->cfg_pool, param), cur_opt);
}
}
/* Process single element */
void
lua_process_element (struct config_file *cfg, const gchar *name, struct module_opt *opt, gint idx)
{
lua_State *L = cfg->lua_state;
gint t;
double *num;
gboolean *flag;
t = lua_type (L, idx);
/* Handle type */
switch (t) {
case LUA_TNUMBER:
opt->actual_data = memory_pool_alloc (cfg->cfg_pool, sizeof (double));
num = (double *)opt->actual_data;
*num = lua_tonumber (L, idx);
opt->lua_type = LUA_VAR_NUM;
break;
case LUA_TBOOLEAN:
opt->actual_data = memory_pool_alloc (cfg->cfg_pool, sizeof (gboolean));
flag = (gboolean *)opt->actual_data;
*flag = lua_toboolean (L, idx);
opt->lua_type = LUA_VAR_BOOLEAN;
break;
case LUA_TSTRING:
opt->actual_data = memory_pool_strdup (cfg->cfg_pool, lua_tostring (L, idx));
opt->lua_type = LUA_VAR_STRING;
break;
case LUA_TFUNCTION:
opt->actual_data = memory_pool_strdup (cfg->cfg_pool, lua_tostring (L, idx));
opt->lua_type = LUA_VAR_FUNCTION;
break;
case LUA_TNIL:
case LUA_TTABLE:
case LUA_TUSERDATA:
case LUA_TTHREAD:
case LUA_TLIGHTUSERDATA:
msg_warn ("cannot handle variables of type %s as there is nothing to do with them", lua_typename (L, t));
opt->lua_type = LUA_VAR_UNKNOWN;
break;
}
}
static void
lua_module_callback (gpointer key, gpointer value, gpointer ud)
{
struct config_file *cfg = ud;
lua_State *L = cfg->lua_state;
GList *cur;
struct module_opt *opt;
cur = value;
while (cur) {
opt = cur->data;
if (opt->is_lua && opt->actual_data == NULL) {
/* Try to extract variable name from config table first */
lua_getglobal (L, "config");
if (lua_istable (L, -1)) {
lua_pushstring (L, opt->param);
lua_gettable (L, -2);
if (lua_isnil (L, -1)) {
/* Try to get global variable */
lua_getglobal (L, opt->param);
}
}
else {
/* Try to get global variable */
lua_getglobal (L, opt->param);
}
lua_process_element (cfg, opt->param, opt, -1);
}
cur = g_list_next (cur);
}
}
/* Do post load initialization based on lua */
void
lua_post_load_config (struct config_file *cfg)
{
lua_State *L = cfg->lua_state;
const gchar *name;
/* First check all module options that may be overriden in 'config' global */
lua_getglobal (L, "config");
if (lua_istable (L, -1)) {
/* Iterate */
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
/* 'key' is at index -2 and 'value' is at index -1 */
/* Key must be a string and value must be a table */
name = luaL_checkstring (L, -2);
if (name != NULL && lua_istable (L, -1)) {
lua_process_module (L, name, cfg);
}
}
}
/* Now parse all lua params */
g_hash_table_foreach (cfg->modules_opts, lua_module_callback, cfg);
}
/* Handle lua dynamic config param */
gboolean
lua_handle_param (struct worker_task *task, gchar *mname, gchar *optname, enum lua_var_type expected_type, gpointer *res)
{
lua_State *L = task->cfg->lua_state;
GList *cur;
struct module_opt *opt;
struct worker_task **ptask;
double num_res;
gboolean bool_res;
gchar *str_res;
if ((cur = g_hash_table_lookup (task->cfg->modules_opts, mname)) == NULL) {
*res = NULL;
return FALSE;
}
/* Search for specified option */
while (cur) {
opt = cur->data;
if (opt->is_lua && g_ascii_strcasecmp (opt->param, optname) == 0) {
if (opt->lua_type == expected_type) {
/* Just push pointer to res */
*res = opt->actual_data;
return TRUE;
}
else if (opt->lua_type == LUA_VAR_FUNCTION) {
/* Call specified function and expect result of given expected_type */
/* First check function in config table */
lua_getglobal (L, "config");
if (lua_istable (L, -1)) {
lua_pushstring (L, opt->actual_data);
lua_gettable (L, -2);
if (lua_isnil (L, -1)) {
/* Try to get global variable */
lua_getglobal (L, opt->actual_data);
}
}
else {
/* Try to get global variable */
lua_getglobal (L, opt->actual_data);
}
if (lua_isnil (L, -1)) {
msg_err ("function with name %s is not defined", (gchar *)opt->actual_data);
return FALSE;
}
/* Now we got function in top of stack */
ptask = lua_newuserdata (L, sizeof (struct worker_task *));
lua_setclass (L, "rspamd{task}", -1);
*ptask = task;
/* Call function */
if (lua_pcall (L, 1, 1, 0) != 0) {
msg_info ("call to %s failed: %s", (gchar *)opt->actual_data, lua_tostring (L, -1));
*res = NULL;
return FALSE;
}
/* Get result of specified type */
switch (expected_type) {
case LUA_VAR_NUM:
if (!lua_isnumber (L, -1)) {
*res = NULL;
return FALSE;
}
num_res = lua_tonumber (L, -1);
*res = memory_pool_alloc (task->task_pool, sizeof (double));
**(double **)res = num_res;
return TRUE;
case LUA_VAR_BOOLEAN:
if (!lua_isboolean (L, -1)) {
*res = NULL;
return FALSE;
}
bool_res = lua_toboolean (L, -1);
*res = memory_pool_alloc (task->task_pool, sizeof (gboolean));
**(gboolean **)res = bool_res;
return TRUE;
case LUA_VAR_STRING:
if (!lua_isstring (L, -1)) {
*res = NULL;
return FALSE;
}
str_res = memory_pool_strdup (task->task_pool, lua_tostring (L, -1));
*res = str_res;
return TRUE;
case LUA_VAR_FUNCTION:
case LUA_VAR_UNKNOWN:
msg_err ("cannot expect function or unknown types");
*res = NULL;
return FALSE;
}
}
}
cur = g_list_next (cur);
}
/* Option not found */
*res = NULL;
return FALSE;
}
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