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/*
* Copyright (c) 2009-2012, Vsevolod Stakhov
* 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 AUTHOR ''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 AUTHOR 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"
#include "expressions.h"
#include "symbols_cache.h"
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif
/*
* This is implementation of lua routines to handle config file params
*/
/* Process a single item in 'metrics' table */
static void
lua_process_metric (lua_State *L, const gchar *name, struct config_file *cfg)
{
GList *metric_list;
gchar *symbol, *old_desc;
const gchar *desc;
struct metric *metric;
gdouble *score, *old_score;
/* Get module opt structure */
if ((metric = g_hash_table_lookup (cfg->metrics, name)) == NULL) {
metric = check_metric_conf (cfg, metric);
metric->name = memory_pool_strdup (cfg->cfg_pool, name);
}
/* Now iterate throught module table */
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
/* key - -2, value - -1 */
symbol = memory_pool_strdup (cfg->cfg_pool, luaL_checkstring (L, -2));
if (symbol != NULL) {
if (lua_istable (L, -1)) {
/* We got a table, so extract individual attributes */
lua_pushstring (L, "weight");
lua_gettable (L, -2);
if (lua_isnumber (L, -1)) {
score = memory_pool_alloc (cfg->cfg_pool, sizeof (double));
*score = lua_tonumber (L, -1);
}
else {
msg_warn ("cannot get weight of symbol: %s", symbol);
continue;
}
lua_pop (L, 1);
lua_pushstring (L, "description");
lua_gettable (L, -2);
if (lua_isstring (L, -1)) {
desc = lua_tostring (L, -1);
old_desc = g_hash_table_lookup (metric->descriptions, symbol);
if (old_desc) {
msg_info ("replacing description for symbol %s", symbol);
g_hash_table_replace (metric->descriptions,
symbol, memory_pool_strdup (cfg->cfg_pool, desc));
}
else {
g_hash_table_insert (metric->descriptions,
symbol, memory_pool_strdup (cfg->cfg_pool, desc));
}
}
lua_pop (L, 1);
}
else if (lua_isnumber (L, -1)) {
/* Just got weight */
score = memory_pool_alloc (cfg->cfg_pool, sizeof (double));
*score = lua_tonumber (L, -1);
}
else {
msg_warn ("cannot get weight of symbol: %s", symbol);
continue;
}
/* Insert symbol */
if ((old_score = g_hash_table_lookup (metric->symbols, symbol)) != NULL) {
msg_info ("replacing weight for symbol %s: %.2f -> %.2f", symbol, *old_score, *score);
g_hash_table_replace (metric->symbols, symbol, score);
}
else {
g_hash_table_insert (metric->symbols, symbol, score);
}
if ((metric_list = g_hash_table_lookup (cfg->metrics_symbols, symbol)) == NULL) {
metric_list = g_list_prepend (NULL, metric);
memory_pool_add_destructor (cfg->cfg_pool, (pool_destruct_func)g_list_free, metric_list);
g_hash_table_insert (cfg->metrics_symbols, symbol, metric_list);
}
else {
/* Slow but keep start element of list in safe */
if (!g_list_find (metric_list, metric)) {
metric_list = g_list_append (metric_list, metric);
}
}
}
}
}
/* 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, *val;
gchar *sym;
struct expression *expr, *old_expr;
ucl_object_t *obj;
gsize keylen;
/* 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_checklstring (L, -2, &keylen);
if (name != NULL && lua_istable (L, -1)) {
obj = lua_rcl_obj_get (L, -1);
if (obj != NULL) {
ucl_object_insert_key_merged (cfg->rcl_obj, obj, name, keylen, true);
}
}
}
}
/* Check metrics settings */
lua_getglobal (L, "metrics");
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_metric (L, name, cfg);
}
}
}
/* Check composites */
lua_getglobal (L, "composites");
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_isstring (L, -1)) {
val = lua_tostring (L, -1);
sym = memory_pool_strdup(cfg->cfg_pool, name);
if ((expr = parse_expression (cfg->cfg_pool, memory_pool_strdup(cfg->cfg_pool, val))) == NULL) {
msg_err ("cannot parse composite expression: %s", val);
continue;
}
/* Now check hash table for this composite */
if ((old_expr = g_hash_table_lookup (cfg->composite_symbols, name)) != NULL) {
msg_info ("replacing composite symbol %s", name);
g_hash_table_replace (cfg->composite_symbols, sym, expr);
}
else {
g_hash_table_insert (cfg->composite_symbols, sym, expr);
register_virtual_symbol (&cfg->cache, sym, 1);
}
}
}
}
}
/* 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)
{
/* xxx: Adopt this for rcl */
/* Option not found */
*res = NULL;
return FALSE;
}
#define FAKE_RES_VAR "rspamd_res"
gboolean
lua_check_condition (struct config_file *cfg, const gchar *condition)
{
lua_State *L = cfg->lua_state;
gchar *hostbuf, *condbuf;
gsize hostlen;
gboolean res;
#ifdef HAVE_SYS_UTSNAME_H
struct utsname uts;
#endif
/* Set some globals for condition */
/* XXX: think what other variables can be useful */
hostlen = sysconf (_SC_HOST_NAME_MAX) + 1;
hostbuf = alloca (hostlen);
gethostname (hostbuf, hostlen);
hostbuf[hostlen - 1] = '\0';
/* Hostname */
lua_pushstring (L, hostbuf);
lua_setglobal (L, "hostname");
/* Config file name */
lua_pushstring (L, cfg->cfg_name);
lua_setglobal (L, "cfg_name");
/* Check for uname */
#ifdef HAVE_SYS_UTSNAME_H
uname (&uts);
lua_pushstring (L, uts.sysname);
lua_setglobal (L, "osname");
lua_pushstring (L, uts.release);
lua_setglobal (L, "osrelease");
#else
lua_pushstring (L, "unknown");
lua_setglobal (L, "osname");
lua_pushstring (L, "");
lua_setglobal (L, "osrelease");
#endif
#ifdef HAVE_OPENSSL
lua_pushboolean (L, TRUE);
#else
lua_pushboolean (L, FALSE);
#endif
lua_setglobal (L, "rspamd_supports_rsa");
/* Rspamd paths */
lua_newtable (L);
lua_set_table_index (L, "confdir", RSPAMD_CONFDIR);
lua_set_table_index (L, "rundir", RSPAMD_RUNDIR);
lua_set_table_index (L, "dbdir", RSPAMD_DBDIR);
lua_set_table_index (L, "logdir", RSPAMD_LOGDIR);
lua_set_table_index (L, "pluginsdir", RSPAMD_PLUGINSDIR);
lua_set_table_index (L, "prefix", RSPAMD_PREFIX);
lua_setglobal (L, "rspamd_paths");
/* Make fake string */
hostlen = sizeof (FAKE_RES_VAR "=") + strlen (condition);
condbuf = g_malloc (hostlen);
rspamd_strlcpy (condbuf, FAKE_RES_VAR "=", sizeof (FAKE_RES_VAR "="));
g_strlcat (condbuf, condition, hostlen);
/* Evaluate condition */
if (luaL_dostring (L, condbuf) != 0) {
msg_err ("eval of '%s' failed: '%s'", condition, lua_tostring (L, -1));
g_free (condbuf);
return FALSE;
}
/* Get global variable res to get result */
lua_getglobal (L, FAKE_RES_VAR);
if (! lua_isboolean (L, -1)) {
msg_err ("bad string evaluated: %s, type: %s", condbuf, lua_typename (L, lua_type (L, -1)));
g_free (condbuf);
return FALSE;
}
res = lua_toboolean (L, -1);
g_free (condbuf);
return res;
}
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