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|
/*
* Copyright 2024 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lua_common.h"
/***
* @module rspamd_regexp
* Rspamd regexp is an utility module that handles rspamd perl compatible
* regular expressions
* @example
* local rspamd_regexp = require "rspamd_regexp"
*
* local re = rspamd_regexp.create_cached('/^\\s*some_string\\s*$/i')
* re:match('some_string')
* local re = rspamd_regexp.create_cached('/\\s+/i')
* re:split('word word word') -- returns ['word', 'word', 'word']
*/
LUA_FUNCTION_DEF(regexp, create);
LUA_FUNCTION_DEF(regexp, import_glob);
LUA_FUNCTION_DEF(regexp, import_plain);
LUA_FUNCTION_DEF(regexp, create_cached);
LUA_FUNCTION_DEF(regexp, get_cached);
LUA_FUNCTION_DEF(regexp, get_pattern);
LUA_FUNCTION_DEF(regexp, set_limit);
LUA_FUNCTION_DEF(regexp, set_max_hits);
LUA_FUNCTION_DEF(regexp, get_max_hits);
LUA_FUNCTION_DEF(regexp, search);
LUA_FUNCTION_DEF(regexp, match);
LUA_FUNCTION_DEF(regexp, matchn);
LUA_FUNCTION_DEF(regexp, split);
LUA_FUNCTION_DEF(regexp, destroy);
LUA_FUNCTION_DEF(regexp, gc);
static const struct luaL_reg regexplib_m[] = {
LUA_INTERFACE_DEF(regexp, get_pattern),
LUA_INTERFACE_DEF(regexp, set_limit),
LUA_INTERFACE_DEF(regexp, set_max_hits),
LUA_INTERFACE_DEF(regexp, get_max_hits),
LUA_INTERFACE_DEF(regexp, match),
LUA_INTERFACE_DEF(regexp, matchn),
LUA_INTERFACE_DEF(regexp, search),
LUA_INTERFACE_DEF(regexp, split),
LUA_INTERFACE_DEF(regexp, destroy),
{"__tostring", lua_regexp_get_pattern},
{"__gc", lua_regexp_gc},
{NULL, NULL}};
static const struct luaL_reg regexplib_f[] = {
LUA_INTERFACE_DEF(regexp, create),
LUA_INTERFACE_DEF(regexp, import_glob),
LUA_INTERFACE_DEF(regexp, import_plain),
LUA_INTERFACE_DEF(regexp, get_cached),
LUA_INTERFACE_DEF(regexp, create_cached),
{NULL, NULL}};
#define LUA_REGEXP_FLAG_DESTROYED (1 << 0)
#define IS_DESTROYED(re) ((re)->re_flags & LUA_REGEXP_FLAG_DESTROYED)
rspamd_mempool_t *regexp_static_pool = NULL;
struct rspamd_lua_regexp *
lua_check_regexp(lua_State *L, int pos)
{
void *ud = rspamd_lua_check_udata(L, pos, rspamd_regexp_classname);
luaL_argcheck(L, ud != NULL, pos, "'regexp' expected");
return ud ? *((struct rspamd_lua_regexp **) ud) : NULL;
}
/***
* @function rspamd_regexp.create(pattern[, flags])
* Creates new rspamd_regexp
* @param {string} pattern pattern to build regexp. If this pattern is enclosed in `//` then it is possible to specify flags after it
* @param {string} flags optional flags to create regular expression
* @return {regexp} regexp argument that is *not* automatically destroyed
* @example
* local regexp = require "rspamd_regexp"
*
* local re = regexp.create('/^test.*[0-9]\\s*$/i')
*/
static int
lua_regexp_create(lua_State *L)
{
LUA_TRACE_POINT;
rspamd_regexp_t *re;
struct rspamd_lua_regexp *new, **pnew;
const char *string, *flags_str = NULL;
GError *err = NULL;
string = luaL_checkstring(L, 1);
if (lua_gettop(L) == 2) {
flags_str = luaL_checkstring(L, 2);
}
if (string) {
re = rspamd_regexp_new(string, flags_str, &err);
if (re == NULL) {
lua_pushnil(L);
msg_info("cannot parse regexp: %s, error: %s",
string,
err == NULL ? "undefined" : err->message);
g_error_free(err);
}
else {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = re;
new->re_pattern = g_strdup(string);
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @function rspamd_regexp.import_glob(glob_pattern[, flags])
* Creates new rspamd_regexp from glob
* @param {string} pattern pattern to build regexp.
* @param {string} flags optional flags to create regular expression
* @return {regexp} regexp argument that is *not* automatically destroyed
* @example
* local regexp = require "rspamd_regexp"
*
* local re = regexp.import_glob('ab*', 'i')
*/
static int
lua_regexp_import_glob(lua_State *L)
{
LUA_TRACE_POINT;
rspamd_regexp_t *re;
struct rspamd_lua_regexp *new, **pnew;
const char *string, *flags_str = NULL;
char *escaped;
gsize pat_len;
GError *err = NULL;
string = luaL_checklstring(L, 1, &pat_len);
if (lua_gettop(L) == 2) {
flags_str = luaL_checkstring(L, 2);
}
if (string) {
escaped = rspamd_str_regexp_escape(string, pat_len, NULL,
RSPAMD_REGEXP_ESCAPE_GLOB | RSPAMD_REGEXP_ESCAPE_UTF);
re = rspamd_regexp_new(escaped, flags_str, &err);
if (re == NULL) {
lua_pushnil(L);
msg_info("cannot parse regexp: %s, error: %s",
string,
err == NULL ? "undefined" : err->message);
g_error_free(err);
g_free(escaped);
}
else {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = re;
new->re_pattern = escaped;
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @function rspamd_regexp.import_plain(plain_string[, flags])
* Creates new rspamd_regexp from plain string (escaping specials)
* @param {string} pattern pattern to build regexp.
* @param {string} flags optional flags to create regular expression
* @return {regexp} regexp argument that is *not* automatically destroyed
* @example
* local regexp = require "rspamd_regexp"
*
* local re = regexp.import_plain('exact_string_with*', 'i')
*/
static int
lua_regexp_import_plain(lua_State *L)
{
LUA_TRACE_POINT;
rspamd_regexp_t *re;
struct rspamd_lua_regexp *new, **pnew;
const char *string, *flags_str = NULL;
char *escaped;
gsize pat_len;
GError *err = NULL;
string = luaL_checklstring(L, 1, &pat_len);
if (lua_gettop(L) == 2) {
flags_str = luaL_checkstring(L, 2);
}
if (string) {
escaped = rspamd_str_regexp_escape(string, pat_len, NULL,
RSPAMD_REGEXP_ESCAPE_ASCII);
re = rspamd_regexp_new(escaped, flags_str, &err);
if (re == NULL) {
lua_pushnil(L);
msg_info("cannot parse regexp: %s, error: %s",
string,
err == NULL ? "undefined" : err->message);
g_error_free(err);
g_free(escaped);
}
else {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = re;
new->re_pattern = escaped;
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @function rspamd_regexp.get_cached(pattern)
* This function gets cached and pre-compiled regexp created by either `create`
* or `create_cached` methods. If no cached regexp is found then `nil` is returned.
*
* @param {string} pattern regexp pattern
* @return {regexp} cached regexp structure or `nil`
*/
static int
lua_regexp_get_cached(lua_State *L)
{
LUA_TRACE_POINT;
rspamd_regexp_t *re;
struct rspamd_lua_regexp *new, **pnew;
const char *string, *flags_str = NULL;
string = luaL_checkstring(L, 1);
if (lua_gettop(L) == 2) {
flags_str = luaL_checkstring(L, 2);
}
if (string) {
re = rspamd_regexp_cache_query(NULL, string, flags_str);
if (re) {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = rspamd_regexp_ref(re);
new->re_pattern = g_strdup(string);
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
else {
lua_pushnil(L);
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @function rspamd_regexp.create_cached(pattern[, flags])
* This function is similar to `create` but it tries to search for regexp in the
* cache first.
* @param {string} pattern pattern to build regexp. If this pattern is enclosed in `//` then it is possible to specify flags after it
* @param {string} flags optional flags to create regular expression
* @return {regexp} regexp argument that is *not* automatically destroyed
* @example
* local regexp = require "rspamd_regexp"
*
* local re = regexp.create_cached('/^test.*[0-9]\\s*$/i')
* ...
* -- This doesn't create new regexp object
* local other_re = regexp.create_cached('/^test.*[0-9]\\s*$/i')
*/
static int
lua_regexp_create_cached(lua_State *L)
{
LUA_TRACE_POINT;
rspamd_regexp_t *re;
struct rspamd_lua_regexp *new, **pnew;
const char *string, *flags_str = NULL;
GError *err = NULL;
string = luaL_checkstring(L, 1);
if (lua_gettop(L) == 2) {
flags_str = luaL_checkstring(L, 2);
}
if (string) {
re = rspamd_regexp_cache_query(NULL, string, flags_str);
if (re) {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = rspamd_regexp_ref(re);
new->re_pattern = g_strdup(string);
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
else {
re = rspamd_regexp_cache_create(NULL, string, flags_str, &err);
if (re == NULL) {
lua_pushnil(L);
msg_info("cannot parse regexp: %s, error: %s",
string,
err == NULL ? "undefined" : err->message);
g_error_free(err);
}
else {
new = g_malloc0(sizeof(struct rspamd_lua_regexp));
new->re = rspamd_regexp_ref(re);
new->re_pattern = g_strdup(string);
new->module = rspamd_lua_get_module_name(L);
pnew = lua_newuserdata(L, sizeof(struct rspamd_lua_regexp *));
rspamd_lua_setclass(L, rspamd_regexp_classname, -1);
*pnew = new;
}
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @method re:get_pattern()
* Get a pattern for specified regexp object
* @return {string} pattern line
*/
static int
lua_regexp_get_pattern(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
if (re && re->re && !IS_DESTROYED(re)) {
lua_pushstring(L, rspamd_regexp_get_pattern(re->re));
}
else {
lua_pushnil(L);
}
return 1;
}
/***
* @method re:set_limit(lim)
* Set maximum size of text length to be matched with this regexp (if `lim` is
* less or equal to zero then all texts are checked)
* @param {number} lim limit in bytes
*/
static int
lua_regexp_set_limit(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
int64_t lim;
lim = lua_tointeger(L, 2);
if (re && re->re && !IS_DESTROYED(re)) {
if (lim > 0) {
rspamd_regexp_set_match_limit(re->re, lim);
}
else {
rspamd_regexp_set_match_limit(re->re, 0);
}
}
return 0;
}
/***
* @method re:set_max_hits(lim)
* Set maximum number of hits returned by a regexp
* @param {number} lim limit in hits count
* @return {number} old number of max hits
*/
static int
lua_regexp_set_max_hits(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
unsigned int lim;
lim = luaL_checkinteger(L, 2);
if (re && re->re && !IS_DESTROYED(re)) {
lua_pushinteger(L, rspamd_regexp_set_maxhits(re->re, lim));
}
else {
lua_pushnil(L);
}
return 1;
}
/***
* @method re:get_max_hits(lim)
* Get maximum number of hits returned by a regexp
* @return {number} number of max hits
*/
static int
lua_regexp_get_max_hits(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
if (re && re->re && !IS_DESTROYED(re)) {
lua_pushinteger(L, rspamd_regexp_get_maxhits(re->re));
}
else {
lua_pushinteger(L, 1);
}
return 1;
}
/***
* @method re:search(line[, raw[, capture]])
* Search line in regular expression object. If line matches then this
* function returns the table of captured strings. Otherwise, nil is returned.
* If `raw` is specified, then input is treated as raw data not encoded in `utf-8`.
* If `capture` is true, then this function saves all captures to the table of
* values, so the first element is the whole matched string and the
* subsequent elements are ordered captures defined within pattern.
*
* @param {string} line match the specified line against regexp object
* @param {bool} match raw regexp instead of utf8 one
* @param {bool} capture perform subpatterns capturing
* @return {table or nil} table of strings or tables (if `capture` is true) or nil if not matched
* @example
* local re = regexp.create_cached('/^\s*([0-9]+)\s*$/')
* -- returns nil
* local m1 = re:search('blah')
* local m2 = re:search(' 190 ')
* -- prints ' 190 '
* print(m2[1])
*
* local m3 = re:search(' 100500 ')
* -- prints ' 100500 '
* print(m3[1][1])
* -- prints '100500' capture
* print(m3[1][2])
*/
static int
lua_regexp_search(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
const char *data = NULL;
struct rspamd_lua_text *t;
const char *start = NULL, *end = NULL;
int i;
gsize len = 0, capn;
gboolean matched = FALSE, capture = FALSE, raw = FALSE;
GArray *captures = NULL;
struct rspamd_re_capture *cap;
if (re && !IS_DESTROYED(re)) {
if (lua_type(L, 2) == LUA_TSTRING) {
data = luaL_checklstring(L, 2, &len);
}
else if (lua_type(L, 2) == LUA_TUSERDATA) {
t = lua_check_text(L, 2);
if (t != NULL) {
data = t->start;
len = t->len;
}
}
if (lua_gettop(L) >= 3) {
raw = lua_toboolean(L, 3);
}
if (data && len > 0) {
if (lua_gettop(L) >= 4 && lua_toboolean(L, 4)) {
capture = TRUE;
captures = g_array_new(FALSE, TRUE,
sizeof(struct rspamd_re_capture));
}
lua_newtable(L);
i = 0;
while (rspamd_regexp_search(re->re, data, len, &start, &end, raw,
captures)) {
if (capture) {
lua_createtable(L, captures->len, 0);
for (capn = 0; capn < captures->len; capn++) {
cap = &g_array_index(captures, struct rspamd_re_capture,
capn);
lua_pushlstring(L, cap->p, cap->len);
lua_rawseti(L, -2, capn + 1);
}
lua_rawseti(L, -2, ++i);
}
else {
lua_pushlstring(L, start, end - start);
lua_rawseti(L, -2, ++i);
}
matched = TRUE;
if (start >= end) {
/* We found all matches, so no more hits are possible (protect from empty patterns) */
break;
}
}
if (!matched) {
lua_pop(L, 1);
lua_pushnil(L);
}
if (capture) {
g_array_free(captures, TRUE);
}
}
else {
lua_pushnil(L);
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @method re:match(line[, raw_match])
* Matches line against the regular expression and return true if line matches
* (partially or completely)
*
* @param {string} line match the specified line against regexp object
* @param {bool} match raw regexp instead of utf8 one
* @return {bool} true if `line` matches
*/
static int
lua_regexp_match(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
struct rspamd_lua_text *t;
const char *data = NULL;
gsize len = 0;
gboolean raw = FALSE;
if (re && !IS_DESTROYED(re)) {
if (lua_type(L, 2) == LUA_TSTRING) {
data = luaL_checklstring(L, 2, &len);
}
else if (lua_type(L, 2) == LUA_TUSERDATA) {
t = lua_check_text(L, 2);
if (t != NULL) {
data = t->start;
len = t->len;
}
}
if (lua_gettop(L) == 3) {
raw = lua_toboolean(L, 3);
}
if (data && len > 0) {
if (rspamd_regexp_search(re->re, data, len, NULL, NULL, raw, NULL)) {
lua_pushboolean(L, TRUE);
}
else {
lua_pushboolean(L, FALSE);
}
}
else {
lua_pushboolean(L, FALSE);
}
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @method re:matchn(line, max_matches, [, raw_match])
* Matches line against the regular expression and return number of matches if line matches
* (partially or completely). This process stop when `max_matches` is reached.
* If `max_matches` is zero, then only a single match is counted which is equal to
* @see re:match If `max_matches` is negative, then all matches are considered.
*
* @param {string} line match the specified line against regexp object
* @param {number} max_matches maximum number of matches
* @param {bool} match raw regexp instead of utf8 one
* @return {number} number of matches found in the `line` argument
*/
static int
lua_regexp_matchn(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
struct rspamd_lua_text *t;
const char *data = NULL, *start = NULL, *end = NULL;
int max_matches, matches;
gsize len = 0;
gboolean raw = FALSE;
if (re && !IS_DESTROYED(re)) {
if (lua_type(L, 2) == LUA_TSTRING) {
data = luaL_checklstring(L, 2, &len);
}
else if (lua_type(L, 2) == LUA_TUSERDATA) {
t = lua_check_text(L, 2);
if (t != NULL) {
data = t->start;
len = t->len;
}
}
max_matches = lua_tointeger(L, 3);
matches = 0;
if (lua_gettop(L) == 4) {
raw = lua_toboolean(L, 4);
}
if (data && len > 0) {
for (;;) {
if (rspamd_regexp_search(re->re, data, len, &start, &end, raw,
NULL)) {
matches++;
}
else {
break;
}
if (max_matches >= 0 && matches >= max_matches) {
break;
}
}
}
lua_pushinteger(L, matches);
}
else {
return luaL_error(L, "invalid arguments");
}
return 1;
}
/***
* @method re:split(line)
* Split line using the specified regular expression.
* Breaks the string on the pattern, and returns an array of the tokens.
* If the pattern contains capturing parentheses, then the text for each
* of the substrings will also be returned. If the pattern does not match
* anywhere in the string, then the whole string is returned as the first
* token.
* @param {string/text} line line to split
* @return {table} table of split line portions (if text was the input, then text is used for return parts)
*/
static int
lua_regexp_split(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *re = lua_check_regexp(L, 1);
const char *data = NULL;
struct rspamd_lua_text *t;
gboolean matched = FALSE, is_text = FALSE;
gsize len = 0;
const char *start = NULL, *end = NULL, *old_start;
int i;
if (re && !IS_DESTROYED(re)) {
if (lua_type(L, 2) == LUA_TSTRING) {
data = luaL_checklstring(L, 2, &len);
}
else if (lua_type(L, 2) == LUA_TUSERDATA) {
t = lua_check_text(L, 2);
if (t == NULL) {
lua_error(L);
return 0;
}
data = t->start;
len = t->len;
is_text = TRUE;
}
if (data && len > 0) {
lua_newtable(L);
i = 0;
old_start = data;
while (rspamd_regexp_search(re->re, data, len, &start, &end, FALSE,
NULL)) {
if (start - old_start > 0) {
if (!is_text) {
lua_pushlstring(L, old_start, start - old_start);
}
else {
t = lua_newuserdata(L, sizeof(*t));
rspamd_lua_setclass(L, rspamd_text_classname, -1);
t->start = old_start;
t->len = start - old_start;
t->flags = 0;
}
lua_rawseti(L, -2, ++i);
matched = TRUE;
}
else if (start >= end) {
break;
}
old_start = end;
}
if (len > 0 && (end == NULL || end < data + len)) {
if (end == NULL) {
end = data;
}
if (!is_text) {
lua_pushlstring(L, end, (data + len) - end);
}
else {
t = lua_newuserdata(L, sizeof(*t));
rspamd_lua_setclass(L, rspamd_text_classname, -1);
t->start = end;
t->len = (data + len) - end;
t->flags = 0;
}
lua_rawseti(L, -2, ++i);
matched = TRUE;
}
if (!matched) {
lua_pop(L, 1);
lua_pushnil(L);
}
return 1;
}
}
else {
return luaL_error(L, "invalid arguments");
}
lua_pushnil(L);
return 1;
}
/***
* @method re:destroy()
* Destroy regexp from caches if needed (the pointer is removed by garbage collector)
*/
static int
lua_regexp_destroy(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *to_del = lua_check_regexp(L, 1);
if (to_del) {
rspamd_regexp_cache_remove(NULL, to_del->re);
rspamd_regexp_unref(to_del->re);
to_del->re = NULL;
to_del->re_flags |= LUA_REGEXP_FLAG_DESTROYED;
}
return 0;
}
static int
lua_regexp_gc(lua_State *L)
{
LUA_TRACE_POINT;
struct rspamd_lua_regexp *to_del = lua_check_regexp(L, 1);
if (to_del) {
if (!IS_DESTROYED(to_del)) {
rspamd_regexp_unref(to_del->re);
}
g_free(to_del->re_pattern);
g_free(to_del->module);
g_free(to_del);
}
return 0;
}
static int
lua_load_regexp(lua_State *L)
{
lua_newtable(L);
luaL_register(L, NULL, regexplib_f);
return 1;
}
void luaopen_regexp(lua_State *L)
{
if (!regexp_static_pool) {
regexp_static_pool = rspamd_mempool_new(rspamd_mempool_suggest_size(),
"regexp_lua_pool", 0);
}
rspamd_lua_new_class(L, rspamd_regexp_classname, regexplib_m);
lua_pop(L, 1);
rspamd_lua_add_preload(L, "rspamd_regexp", lua_load_regexp);
}
RSPAMD_DESTRUCTOR(lua_re_static_pool_dtor)
{
if (regexp_static_pool) {
rspamd_mempool_delete(regexp_static_pool);
}
}
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