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/* Copyright (c) 2010, 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 ''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"
LUA_FUNCTION_DEF (regexp, create);
LUA_FUNCTION_DEF (regexp, get_cached);
LUA_FUNCTION_DEF (regexp, get_pattern);
LUA_FUNCTION_DEF (regexp, match);
LUA_FUNCTION_DEF (regexp, split);
LUA_FUNCTION_DEF (regexp, destroy);
static const struct luaL_reg regexplib_m[] = {
LUA_INTERFACE_DEF (regexp, get_pattern),
LUA_INTERFACE_DEF (regexp, match),
LUA_INTERFACE_DEF (regexp, split),
LUA_INTERFACE_DEF (regexp, destroy),
{"__tostring", lua_class_tostring},
{NULL, NULL}
};
static const struct luaL_reg regexplib_f[] = {
LUA_INTERFACE_DEF (regexp, create),
LUA_INTERFACE_DEF (regexp, get_cached),
{NULL, NULL}
};
memory_pool_t *regexp_static_pool = NULL;
struct rspamd_lua_regexp {
GRegex *re;
gchar *re_pattern;
gint re_flags;
};
static struct rspamd_lua_regexp *
lua_check_regexp (lua_State * L)
{
void *ud = luaL_checkudata (L, 1, "rspamd{regexp}");
luaL_argcheck (L, ud != NULL, 1, "'regexp' expected");
return ud ? *((struct rspamd_lua_regexp **)ud) : NULL;
}
static int
lua_regexp_create (lua_State *L)
{
gint regexp_flags = 0;
GRegex *re;
struct rspamd_lua_regexp *new, **pnew;
const gchar *string, *flags_str = NULL;
GError *err = NULL;
string = luaL_checkstring (L, 1);
if (lua_gettop (L) == 2) {
flags_str = luaL_checkstring (L, 2);
}
if (flags_str) {
while (*flags_str) {
switch (*flags_str) {
case 'i':
regexp_flags |= G_REGEX_CASELESS;
break;
case 'm':
regexp_flags |= G_REGEX_MULTILINE;
break;
case 's':
regexp_flags |= G_REGEX_DOTALL;
break;
case 'x':
regexp_flags |= G_REGEX_EXTENDED;
break;
case 'u':
regexp_flags |= G_REGEX_UNGREEDY;
break;
case 'o':
regexp_flags |= G_REGEX_OPTIMIZE;
break;
case 'r':
regexp_flags |= G_REGEX_RAW;
break;
default:
msg_info ("invalid regexp flag: %c", *flags_str);
break;
}
flags_str ++;
}
}
re = g_regex_new (string, regexp_flags, 0, &err);
if (re == NULL) {
lua_pushnil (L);
msg_info ("cannot parse regexp: %s, error: %s", string, err == NULL ? "undefined" : err->message);
}
else {
new = g_slice_alloc (sizeof (struct rspamd_lua_regexp));
new->re = re;
new->re_flags = regexp_flags;
new->re_pattern = g_strdup (string);
pnew = lua_newuserdata (L, sizeof (struct rspamd_lua_regexp *));
lua_setclass (L, "rspamd{regexp}", -1);
*pnew = new;
re_cache_add (new->re_pattern, new, regexp_static_pool);
}
return 1;
}
static int
lua_regexp_get_cached (lua_State *L)
{
struct rspamd_lua_regexp *new, **pnew;
const gchar *line;
line = luaL_checkstring (L, 1);
new = re_cache_check (line, regexp_static_pool);
if (new) {
pnew = lua_newuserdata (L, sizeof (struct rspamd_lua_regexp *));
lua_setclass (L, "rspamd{regexp}", -1);
*pnew = new;
}
else {
lua_pushnil (L);
}
return 1;
}
static int
lua_regexp_get_pattern (lua_State *L)
{
struct rspamd_lua_regexp *re = lua_check_regexp (L);
if (re) {
lua_pushstring (L, re->re_pattern);
}
return 1;
}
static int
lua_regexp_match (lua_State *L)
{
struct rspamd_lua_regexp *re = lua_check_regexp (L);
GMatchInfo *mi;
const gchar *data;
gchar **matches;
gint i;
if (re) {
data = luaL_checkstring (L, 2);
if (data) {
if ((re->re_flags & G_REGEX_RAW) == 0) {
/* Validate input */
if (!g_utf8_validate (data, -1, NULL)) {
lua_pushnil (L);
return 1;
}
}
if (g_regex_match_full (re->re, data, -1, 0, 0, &mi, NULL)) {
matches = g_match_info_fetch_all (mi);
lua_newtable (L);
for (i = 1; matches[i - 1] != NULL; i ++) {
lua_pushstring (L, matches[i - 1]);
lua_rawseti (L, -2, i);
}
g_strfreev (matches);
}
else {
lua_pushnil (L);
}
g_match_info_free (mi);
return 1;
}
}
lua_pushnil (L);
return 1;
}
static int
lua_regexp_split (lua_State *L)
{
struct rspamd_lua_regexp *re = lua_check_regexp (L);
const gchar *data;
gchar **parts;
gint i;
if (re) {
data = luaL_checkstring (L, 2);
if (data) {
if ((re->re_flags & G_REGEX_RAW) == 0) {
/* Validate input */
if (!g_utf8_validate (data, -1, NULL)) {
lua_pushnil (L);
return 1;
}
}
parts = g_regex_split (re->re, data, 0);
lua_newtable (L);
for (i = 1; parts[i - 1] != NULL; i ++) {
lua_pushstring (L, parts[i - 1]);
lua_rawseti (L, -2, i);
}
g_strfreev (parts);
return 1;
}
}
lua_pushnil (L);
return 1;
}
/*
* We are not using __gc metamethod as it is usually good idea to have
* compiled regexps to be stored permamently, so this method can be used
* for avoiding memory leaks for temporary regexps
*
*
*/
static gint
lua_regexp_destroy (lua_State *L)
{
struct rspamd_lua_regexp *to_del = lua_check_regexp (L);
if (to_del) {
re_cache_del (to_del->re_pattern, regexp_static_pool);
g_regex_unref (to_del->re);
g_free (to_del->re_pattern);
g_slice_free1 (sizeof (struct rspamd_lua_regexp), to_del);
}
return 0;
}
gint
luaopen_glib_regexp (lua_State * L)
{
luaL_newmetatable (L, "rspamd{regexp}");
lua_pushstring (L, "__index");
lua_pushvalue (L, -2);
lua_settable (L, -3);
lua_pushstring (L, "class");
lua_pushstring (L, "rspamd{regexp}");
lua_rawset (L, -3);
luaL_openlib (L, NULL, regexplib_m, 0);
luaL_openlib(L, "regexp", regexplib_f, 0);
regexp_static_pool = memory_pool_new (memory_pool_get_size ());
return 1;
}
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