rspamd/src/libserver/re_cache.c

/*
 * 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 "libmime/message.h"
#include "re_cache.h"
#include "cryptobox.h"
#include "ref.h"
#include "libserver/url.h"
#include "libserver/task.h"
#include "libserver/cfg_file.h"
#include "libutil/util.h"
#include "libutil/regexp.h"
#include "lua/lua_common.h"
#include "libstat/stat_api.h"
#include "contrib/uthash/utlist.h"
#include "lua/lua_classnames.h"

#include "khash.h"

#ifdef WITH_HYPERSCAN
#include "hs.h"
#include "hyperscan_tools.h"
#endif

#include "unix-std.h"
#include <signal.h>
#include <stdalign.h>
#include <math.h>
#include "contrib/libev/ev.h"

#ifndef WITH_PCRE2
#include <pcre.h>
#else
#include <pcre2.h>
#endif

#include "contrib/fastutf8/fastutf8.h"

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#define msg_err_re_cache(...) rspamd_default_log_function(G_LOG_LEVEL_CRITICAL,    \
														  "re_cache", cache->hash, \
														  RSPAMD_LOG_FUNC,         \
														  __VA_ARGS__)
#define msg_warn_re_cache(...) rspamd_default_log_function(G_LOG_LEVEL_WARNING,     \
														   "re_cache", cache->hash, \
														   RSPAMD_LOG_FUNC,         \
														   __VA_ARGS__)
#define msg_info_re_cache(...) rspamd_default_log_function(G_LOG_LEVEL_INFO,        \
														   "re_cache", cache->hash, \
														   RSPAMD_LOG_FUNC,         \
														   __VA_ARGS__)

#define msg_debug_re_task(...) rspamd_conditional_debug_fast(NULL, NULL,                                                   \
															 rspamd_re_cache_log_id, "re_cache", task->task_pool->tag.uid, \
															 RSPAMD_LOG_FUNC,                                              \
															 __VA_ARGS__)
#define msg_debug_re_cache(...) rspamd_conditional_debug_fast(NULL, NULL,                                      \
															  rspamd_re_cache_log_id, "re_cache", cache->hash, \
															  RSPAMD_LOG_FUNC,                                 \
															  __VA_ARGS__)

INIT_LOG_MODULE(re_cache)

#ifdef WITH_HYPERSCAN
#define RSPAMD_HS_MAGIC_LEN (sizeof(rspamd_hs_magic))
static const unsigned char rspamd_hs_magic[] = {'r', 's', 'h', 's', 'r', 'e', '1', '1'},
						   rspamd_hs_magic_vector[] = {'r', 's', 'h', 's', 'r', 'v', '1', '1'};
#endif


struct rspamd_re_class {
	uint64_t id;
	enum rspamd_re_type type;
	gboolean has_utf8; /* if there are any utf8 regexps */
	gpointer type_data;
	gsize type_len;
	GHashTable *re;
	rspamd_cryptobox_hash_state_t *st;

	char hash[rspamd_cryptobox_HASHBYTES + 1];

#ifdef WITH_HYPERSCAN
	rspamd_hyperscan_t *hs_db;
	hs_scratch_t *hs_scratch;
	int *hs_ids;
	unsigned int nhs;
#endif
};

enum rspamd_re_cache_elt_match_type {
	RSPAMD_RE_CACHE_PCRE = 0,
	RSPAMD_RE_CACHE_HYPERSCAN,
	RSPAMD_RE_CACHE_HYPERSCAN_PRE
};

struct rspamd_re_cache_elt {
	rspamd_regexp_t *re;
	int lua_cbref;
	enum rspamd_re_cache_elt_match_type match_type;
};

KHASH_INIT(lua_selectors_hash, char *, int, 1, kh_str_hash_func, kh_str_hash_equal);

struct rspamd_re_cache {
	GHashTable *re_classes;

	GPtrArray *re;
	khash_t(lua_selectors_hash) * selectors;
	ref_entry_t ref;
	unsigned int nre;
	unsigned int max_re_data;
	char hash[rspamd_cryptobox_HASHBYTES + 1];
	lua_State *L;
#ifdef WITH_HYPERSCAN
	enum rspamd_hyperscan_status hyperscan_loaded;
	gboolean disable_hyperscan;
	hs_platform_info_t plt;
#endif
};

struct rspamd_re_selector_result {
	unsigned char **scvec;
	unsigned int *lenvec;
	unsigned int cnt;
};

KHASH_INIT(selectors_results_hash, int, struct rspamd_re_selector_result, 1,
		   kh_int_hash_func, kh_int_hash_equal);

struct rspamd_re_runtime {
	unsigned char *checked;
	unsigned char *results;
	khash_t(selectors_results_hash) * sel_cache;
	struct rspamd_re_cache *cache;
	struct rspamd_re_cache_stat stat;
	gboolean has_hs;
};

static GQuark
rspamd_re_cache_quark(void)
{
	return g_quark_from_static_string("re_cache");
}

static uint64_t
rspamd_re_cache_class_id(enum rspamd_re_type type,
						 gconstpointer type_data,
						 gsize datalen)
{
	rspamd_cryptobox_fast_hash_state_t st;

	rspamd_cryptobox_fast_hash_init(&st, 0xdeadbabe);
	rspamd_cryptobox_fast_hash_update(&st, &type, sizeof(type));

	if (datalen > 0) {
		rspamd_cryptobox_fast_hash_update(&st, type_data, datalen);
	}

	return rspamd_cryptobox_fast_hash_final(&st);
}

static void
rspamd_re_cache_destroy(struct rspamd_re_cache *cache)
{
	GHashTableIter it;
	gpointer k, v;
	struct rspamd_re_class *re_class;
	char *skey;
	int sref;

	g_assert(cache != NULL);
	g_hash_table_iter_init(&it, cache->re_classes);

	while (g_hash_table_iter_next(&it, &k, &v)) {
		re_class = v;
		g_hash_table_iter_steal(&it);
		g_hash_table_unref(re_class->re);

		if (re_class->type_data) {
			g_free(re_class->type_data);
		}

#ifdef WITH_HYPERSCAN
		if (re_class->hs_db) {
			rspamd_hyperscan_free(re_class->hs_db, false);
		}
		if (re_class->hs_scratch) {
			hs_free_scratch(re_class->hs_scratch);
		}
		if (re_class->hs_ids) {
			g_free(re_class->hs_ids);
		}
#endif
		g_free(re_class);
	}

	if (cache->L) {
		kh_foreach(cache->selectors, skey, sref, {
			luaL_unref(cache->L, LUA_REGISTRYINDEX, sref);
			g_free(skey);
		});

		struct rspamd_re_cache_elt *elt;
		unsigned int i;

		PTR_ARRAY_FOREACH(cache->re, i, elt)
		{
			if (elt->lua_cbref != -1) {
				luaL_unref(cache->L, LUA_REGISTRYINDEX, elt->lua_cbref);
			}
		}
	}

	kh_destroy(lua_selectors_hash, cache->selectors);

	g_hash_table_unref(cache->re_classes);
	g_ptr_array_free(cache->re, TRUE);
	g_free(cache);
}

static void
rspamd_re_cache_elt_dtor(gpointer e)
{
	struct rspamd_re_cache_elt *elt = e;

	rspamd_regexp_unref(elt->re);
	g_free(elt);
}

struct rspamd_re_cache *
rspamd_re_cache_new(void)
{
	struct rspamd_re_cache *cache;

	cache = g_malloc0(sizeof(*cache));
	cache->re_classes = g_hash_table_new(g_int64_hash, g_int64_equal);
	cache->nre = 0;
	cache->re = g_ptr_array_new_full(256, rspamd_re_cache_elt_dtor);
	cache->selectors = kh_init(lua_selectors_hash);
#ifdef WITH_HYPERSCAN
	cache->hyperscan_loaded = RSPAMD_HYPERSCAN_UNKNOWN;
#endif
	REF_INIT_RETAIN(cache, rspamd_re_cache_destroy);

	return cache;
}

enum rspamd_hyperscan_status
rspamd_re_cache_is_hs_loaded(struct rspamd_re_cache *cache)
{
	g_assert(cache != NULL);

#ifdef WITH_HYPERSCAN
	return cache->hyperscan_loaded;
#else
	return RSPAMD_HYPERSCAN_UNSUPPORTED;
#endif
}

rspamd_regexp_t *
rspamd_re_cache_add(struct rspamd_re_cache *cache,
					rspamd_regexp_t *re,
					enum rspamd_re_type type,
					gconstpointer type_data, gsize datalen,
					int lua_cbref)
{
	uint64_t class_id;
	struct rspamd_re_class *re_class;
	rspamd_regexp_t *nre;
	struct rspamd_re_cache_elt *elt;

	g_assert(cache != NULL);
	g_assert(re != NULL);

	class_id = rspamd_re_cache_class_id(type, type_data, datalen);
	re_class = g_hash_table_lookup(cache->re_classes, &class_id);

	if (re_class == NULL) {
		re_class = g_malloc0(sizeof(*re_class));
		re_class->id = class_id;
		re_class->type_len = datalen;
		re_class->type = type;
		re_class->re = g_hash_table_new_full(rspamd_regexp_hash,
											 rspamd_regexp_equal, NULL, (GDestroyNotify) rspamd_regexp_unref);

		if (datalen > 0) {
			re_class->type_data = g_malloc0(datalen);
			memcpy(re_class->type_data, type_data, datalen);
		}

		g_hash_table_insert(cache->re_classes, &re_class->id, re_class);
	}

	if ((nre = g_hash_table_lookup(re_class->re, rspamd_regexp_get_id(re))) == NULL) {
		/*
		 * We set re id based on the global position in the cache
		 */
		elt = g_malloc0(sizeof(*elt));
		/* One ref for re_class */
		nre = rspamd_regexp_ref(re);
		rspamd_regexp_set_cache_id(re, cache->nre++);
		/* One ref for cache */
		elt->re = rspamd_regexp_ref(re);
		g_ptr_array_add(cache->re, elt);
		rspamd_regexp_set_class(re, re_class);
		elt->lua_cbref = lua_cbref;

		g_hash_table_insert(re_class->re, rspamd_regexp_get_id(nre), nre);
	}

	if (rspamd_regexp_get_flags(re) & RSPAMD_REGEXP_FLAG_UTF) {
		re_class->has_utf8 = TRUE;
	}

	return nre;
}

void rspamd_re_cache_replace(struct rspamd_re_cache *cache,
							 rspamd_regexp_t *what,
							 rspamd_regexp_t *with)
{
	uint64_t re_id;
	struct rspamd_re_class *re_class;
	rspamd_regexp_t *src;
	struct rspamd_re_cache_elt *elt;

	g_assert(cache != NULL);
	g_assert(what != NULL);
	g_assert(with != NULL);

	re_class = rspamd_regexp_get_class(what);

	if (re_class != NULL) {
		re_id = rspamd_regexp_get_cache_id(what);

		g_assert(re_id != RSPAMD_INVALID_ID);
		src = g_hash_table_lookup(re_class->re, rspamd_regexp_get_id(what));
		elt = g_ptr_array_index(cache->re, re_id);
		g_assert(elt != NULL);
		g_assert(src != NULL);

		rspamd_regexp_set_cache_id(what, RSPAMD_INVALID_ID);
		rspamd_regexp_set_class(what, NULL);
		rspamd_regexp_set_cache_id(with, re_id);
		rspamd_regexp_set_class(with, re_class);
		/*
		 * On calling of this function, we actually unref old re (what)
		 */
		g_hash_table_insert(re_class->re,
							rspamd_regexp_get_id(what),
							rspamd_regexp_ref(with));

		rspamd_regexp_unref(elt->re);
		elt->re = rspamd_regexp_ref(with);
		/* XXX: do not touch match type here */
	}
}

static int
rspamd_re_cache_sort_func(gconstpointer a, gconstpointer b)
{
	struct rspamd_re_cache_elt *const *re1 = a, *const *re2 = b;

	return rspamd_regexp_cmp(rspamd_regexp_get_id((*re1)->re),
							 rspamd_regexp_get_id((*re2)->re));
}

void rspamd_re_cache_init(struct rspamd_re_cache *cache, struct rspamd_config *cfg)
{
	unsigned int i, fl;
	GHashTableIter it;
	gpointer k, v;
	struct rspamd_re_class *re_class;
	rspamd_cryptobox_hash_state_t st_global;
	rspamd_regexp_t *re;
	struct rspamd_re_cache_elt *elt;
	unsigned char hash_out[rspamd_cryptobox_HASHBYTES];

	g_assert(cache != NULL);

	rspamd_cryptobox_hash_init(&st_global, NULL, 0);
	/* Resort all regexps */
	g_ptr_array_sort(cache->re, rspamd_re_cache_sort_func);

	for (i = 0; i < cache->re->len; i++) {
		elt = g_ptr_array_index(cache->re, i);
		re = elt->re;
		re_class = rspamd_regexp_get_class(re);
		g_assert(re_class != NULL);
		rspamd_regexp_set_cache_id(re, i);

		if (re_class->st == NULL) {
			(void) !posix_memalign((void **) &re_class->st, RSPAMD_ALIGNOF(rspamd_cryptobox_hash_state_t),
								   sizeof(*re_class->st));
			g_assert(re_class->st != NULL);
			rspamd_cryptobox_hash_init(re_class->st, NULL, 0);
		}

		/* Update hashes */
		/* Id of re class */
		rspamd_cryptobox_hash_update(re_class->st, (gpointer) &re_class->id,
									 sizeof(re_class->id));
		rspamd_cryptobox_hash_update(&st_global, (gpointer) &re_class->id,
									 sizeof(re_class->id));
		/* Id of re expression */
		rspamd_cryptobox_hash_update(re_class->st, rspamd_regexp_get_id(re),
									 rspamd_cryptobox_HASHBYTES);
		rspamd_cryptobox_hash_update(&st_global, rspamd_regexp_get_id(re),
									 rspamd_cryptobox_HASHBYTES);
		/* PCRE flags */
		fl = rspamd_regexp_get_pcre_flags(re);
		rspamd_cryptobox_hash_update(re_class->st, (const unsigned char *) &fl,
									 sizeof(fl));
		rspamd_cryptobox_hash_update(&st_global, (const unsigned char *) &fl,
									 sizeof(fl));
		/* Rspamd flags */
		fl = rspamd_regexp_get_flags(re);
		rspamd_cryptobox_hash_update(re_class->st, (const unsigned char *) &fl,
									 sizeof(fl));
		rspamd_cryptobox_hash_update(&st_global, (const unsigned char *) &fl,
									 sizeof(fl));
		/* Limit of hits */
		fl = rspamd_regexp_get_maxhits(re);
		rspamd_cryptobox_hash_update(re_class->st, (const unsigned char *) &fl,
									 sizeof(fl));
		rspamd_cryptobox_hash_update(&st_global, (const unsigned char *) &fl,
									 sizeof(fl));
		/* Numeric order */
		rspamd_cryptobox_hash_update(re_class->st, (const unsigned char *) &i,
									 sizeof(i));
		rspamd_cryptobox_hash_update(&st_global, (const unsigned char *) &i,
									 sizeof(i));
	}

	rspamd_cryptobox_hash_final(&st_global, hash_out);
	rspamd_snprintf(cache->hash, sizeof(cache->hash), "%*xs",
					(int) rspamd_cryptobox_HASHBYTES, hash_out);

	/* Now finalize all classes */
	g_hash_table_iter_init(&it, cache->re_classes);

	while (g_hash_table_iter_next(&it, &k, &v)) {
		re_class = v;

		if (re_class->st) {
			/*
			 * We finally update all classes with the number of expressions
			 * in the cache to ensure that if even a single re has been changed
			 * we won't be broken due to id mismatch
			 */
			rspamd_cryptobox_hash_update(re_class->st,
										 (gpointer) &cache->re->len,
										 sizeof(cache->re->len));
			rspamd_cryptobox_hash_final(re_class->st, hash_out);
			rspamd_snprintf(re_class->hash, sizeof(re_class->hash), "%*xs",
							(int) rspamd_cryptobox_HASHBYTES, hash_out);
			free(re_class->st); /* Due to posix_memalign */
			re_class->st = NULL;
		}
	}

	cache->L = cfg->lua_state;

#ifdef WITH_HYPERSCAN
	const char *platform = "generic";
	rspamd_fstring_t *features = rspamd_fstring_new();

	cache->disable_hyperscan = cfg->disable_hyperscan;

	g_assert(hs_populate_platform(&cache->plt) == HS_SUCCESS);

	/* Now decode what we do have */
	switch (cache->plt.tune) {
	case HS_TUNE_FAMILY_HSW:
		platform = "haswell";
		break;
	case HS_TUNE_FAMILY_SNB:
		platform = "sandy";
		break;
	case HS_TUNE_FAMILY_BDW:
		platform = "broadwell";
		break;
	case HS_TUNE_FAMILY_IVB:
		platform = "ivy";
		break;
	default:
		break;
	}

	if (cache->plt.cpu_features & HS_CPU_FEATURES_AVX2) {
		features = rspamd_fstring_append(features, "AVX2", 4);
	}

	hs_set_allocator(g_malloc, g_free);

	msg_info_re_cache("loaded hyperscan engine with cpu tune '%s' and features '%V'",
					  platform, features);

	rspamd_fstring_free(features);
#endif
}

struct rspamd_re_runtime *
rspamd_re_cache_runtime_new(struct rspamd_re_cache *cache)
{
	struct rspamd_re_runtime *rt;
	g_assert(cache != NULL);

	rt = g_malloc0(sizeof(*rt) + NBYTES(cache->nre) + cache->nre);
	rt->cache = cache;
	REF_RETAIN(cache);
	rt->checked = ((unsigned char *) rt) + sizeof(*rt);
	rt->results = rt->checked + NBYTES(cache->nre);
	rt->stat.regexp_total = cache->nre;
#ifdef WITH_HYPERSCAN
	rt->has_hs = cache->hyperscan_loaded;
#endif

	return rt;
}

const struct rspamd_re_cache_stat *
rspamd_re_cache_get_stat(struct rspamd_re_runtime *rt)
{
	g_assert(rt != NULL);

	return &rt->stat;
}

static gboolean
rspamd_re_cache_check_lua_condition(struct rspamd_task *task,
									rspamd_regexp_t *re,
									const unsigned char *in, gsize len,
									goffset start, goffset end,
									int lua_cbref)
{
	lua_State *L = (lua_State *) task->cfg->lua_state;
	GError *err = NULL;
	struct rspamd_lua_text __attribute__((unused)) * t;
	int text_pos;

	if (G_LIKELY(lua_cbref == -1)) {
		return TRUE;
	}

	t = lua_new_text(L, in, len, FALSE);
	text_pos = lua_gettop(L);

	if (!rspamd_lua_universal_pcall(L, lua_cbref,
									G_STRLOC, 1, "utii", &err,
									rspamd_task_classname, task,
									text_pos, start, end)) {
		msg_warn_task("cannot call for re_cache_check_lua_condition for re %s: %e",
					  rspamd_regexp_get_pattern(re), err);
		g_error_free(err);
		lua_settop(L, text_pos - 1);

		return TRUE;
	}

	gboolean res = lua_toboolean(L, -1);

	lua_settop(L, text_pos - 1);

	return res;
}

static unsigned int
rspamd_re_cache_process_pcre(struct rspamd_re_runtime *rt,
							 rspamd_regexp_t *re, struct rspamd_task *task,
							 const unsigned char *in, gsize len,
							 gboolean is_raw,
							 int lua_cbref)
{
	unsigned int r = 0;
	const char *start = NULL, *end = NULL;
	unsigned int max_hits = rspamd_regexp_get_maxhits(re);
	uint64_t id = rspamd_regexp_get_cache_id(re);
	double t1 = NAN, t2, pr;
	const double slow_time = 1e8;

	if (in == NULL) {
		return rt->results[id];
	}

	if (len == 0) {
		return rt->results[id];
	}

	if (rt->cache->max_re_data > 0 && len > rt->cache->max_re_data) {
		len = rt->cache->max_re_data;
	}

	r = rt->results[id];

	if (max_hits == 0 || r < max_hits) {
		pr = rspamd_random_double_fast();

		if (pr > 0.9) {
			t1 = rspamd_get_ticks(TRUE);
		}

		while (rspamd_regexp_search(re,
									in,
									len,
									&start,
									&end,
									is_raw,
									NULL)) {
			if (rspamd_re_cache_check_lua_condition(task, re, in, len,
													start - (const char *) in, end - (const char *) in, lua_cbref)) {
				r++;
				msg_debug_re_task("found regexp /%s/, total hits: %d",
								  rspamd_regexp_get_pattern(re), r);
			}

			if (max_hits > 0 && r >= max_hits) {
				break;
			}

			if (start >= end) {
				/* We found all matches, so no more hits are possible (protect from empty patterns) */
				break;
			}
		}

		rt->results[id] += r;
		rt->stat.regexp_checked++;
		rt->stat.bytes_scanned_pcre += len;
		rt->stat.bytes_scanned += len;

		if (r > 0) {
			rt->stat.regexp_matched += r;
		}

		if (!isnan(t1)) {
			t2 = rspamd_get_ticks(TRUE);

			if (t2 - t1 > slow_time) {
				rspamd_symcache_enable_profile(task);
				msg_info_task("regexp '%16s' took %.0f ticks to execute",
							  rspamd_regexp_get_pattern(re), t2 - t1);
			}
		}
	}

	return r;
}

#ifdef WITH_HYPERSCAN
struct rspamd_re_hyperscan_cbdata {
	struct rspamd_re_runtime *rt;
	const unsigned char **ins;
	const unsigned int *lens;
	unsigned int count;
	rspamd_regexp_t *re;
	struct rspamd_task *task;
};

static int
rspamd_re_cache_hyperscan_cb(unsigned int id,
							 unsigned long long from,
							 unsigned long long to,
							 unsigned int flags,
							 void *ud)
{
	struct rspamd_re_hyperscan_cbdata *cbdata = ud;
	struct rspamd_re_runtime *rt;
	struct rspamd_re_cache_elt *cache_elt;
	unsigned int ret, maxhits, i, processed;
	struct rspamd_task *task;

	rt = cbdata->rt;
	task = cbdata->task;
	cache_elt = g_ptr_array_index(rt->cache->re, id);
	maxhits = rspamd_regexp_get_maxhits(cache_elt->re);

	if (cache_elt->match_type == RSPAMD_RE_CACHE_HYPERSCAN) {
		if (rspamd_re_cache_check_lua_condition(task, cache_elt->re,
												cbdata->ins[0], cbdata->lens[0], from, to, cache_elt->lua_cbref)) {
			ret = 1;
			setbit(rt->checked, id);

			if (maxhits == 0 || rt->results[id] < maxhits) {
				rt->results[id] += ret;
				rt->stat.regexp_matched++;
			}
			msg_debug_re_task("found regexp /%s/ using hyperscan only, total hits: %d",
							  rspamd_regexp_get_pattern(cache_elt->re), rt->results[id]);
		}
	}
	else {
		if (!isset(rt->checked, id)) {

			processed = 0;

			for (i = 0; i < cbdata->count; i++) {
				rspamd_re_cache_process_pcre(rt,
											 cache_elt->re,
											 cbdata->task,
											 cbdata->ins[i],
											 cbdata->lens[i],
											 FALSE,
											 cache_elt->lua_cbref);
				setbit(rt->checked, id);

				processed += cbdata->lens[i];

				if (processed >= to) {
					break;
				}
			}
		}
	}

	return 0;
}
#endif

static unsigned int
rspamd_re_cache_process_regexp_data(struct rspamd_re_runtime *rt,
									rspamd_regexp_t *re, struct rspamd_task *task,
									const unsigned char **in, unsigned int *lens,
									unsigned int count,
									gboolean is_raw,
									gboolean *processed_hyperscan)
{

	uint64_t re_id;
	unsigned int ret = 0;
	unsigned int i;
	struct rspamd_re_cache_elt *cache_elt;

	re_id = rspamd_regexp_get_cache_id(re);

	if (count == 0 || in == NULL) {
		/* We assume this as absence of the specified data */
		setbit(rt->checked, re_id);
		rt->results[re_id] = ret;
		return ret;
	}

	cache_elt = (struct rspamd_re_cache_elt *) g_ptr_array_index(rt->cache->re, re_id);

#ifndef WITH_HYPERSCAN
	for (i = 0; i < count; i++) {
		ret = rspamd_re_cache_process_pcre(rt,
										   re,
										   task,
										   in[i],
										   lens[i],
										   is_raw,
										   cache_elt->lua_cbref);
		rt->results[re_id] = ret;
	}

	setbit(rt->checked, re_id);
#else
	struct rspamd_re_class *re_class;
	struct rspamd_re_hyperscan_cbdata cbdata;

	cache_elt = g_ptr_array_index(rt->cache->re, re_id);
	re_class = rspamd_regexp_get_class(re);

	if (rt->cache->disable_hyperscan || cache_elt->match_type == RSPAMD_RE_CACHE_PCRE ||
		!rt->has_hs || (is_raw && re_class->has_utf8)) {
		for (i = 0; i < count; i++) {
			ret = rspamd_re_cache_process_pcre(rt,
											   re,
											   task,
											   in[i],
											   lens[i],
											   is_raw,
											   cache_elt->lua_cbref);
		}

		setbit(rt->checked, re_id);
	}
	else {
		for (i = 0; i < count; i++) {
			/* For Hyperscan we can probably safely disable all those limits */
#if 0
			if (rt->cache->max_re_data > 0 && lens[i] > rt->cache->max_re_data) {
				lens[i] = rt->cache->max_re_data;
			}
#endif
			rt->stat.bytes_scanned += lens[i];
		}

		g_assert(re_class->hs_scratch != NULL);
		g_assert(re_class->hs_db != NULL);

		/* Go through hyperscan API */
		for (i = 0; i < count; i++) {
			cbdata.ins = &in[i];
			cbdata.re = re;
			cbdata.rt = rt;
			cbdata.lens = &lens[i];
			cbdata.count = 1;
			cbdata.task = task;

			if ((hs_scan(rspamd_hyperscan_get_database(re_class->hs_db),
						 in[i], lens[i], 0,
						 re_class->hs_scratch,
						 rspamd_re_cache_hyperscan_cb, &cbdata)) != HS_SUCCESS) {
				ret = 0;
			}
			else {
				ret = rt->results[re_id];
				*processed_hyperscan = TRUE;
			}
		}
	}
#endif

	return ret;
}

static void
rspamd_re_cache_finish_class(struct rspamd_task *task,
							 struct rspamd_re_runtime *rt,
							 struct rspamd_re_class *re_class,
							 const char *class_name)
{
#ifdef WITH_HYPERSCAN
	unsigned int i;
	uint64_t re_id;
	unsigned int found = 0;

	/* Set all bits that are not checked and included in hyperscan to 1 */
	for (i = 0; i < re_class->nhs; i++) {
		re_id = re_class->hs_ids[i];

		if (!isset(rt->checked, re_id)) {
			g_assert(rt->results[re_id] == 0);
			rt->results[re_id] = 0;
			setbit(rt->checked, re_id);
		}
		else {
			found++;
		}
	}

	msg_debug_re_task("finished hyperscan for class %s; %d "
					  "matches found; %d hyperscan supported regexps; %d total regexps",
					  class_name, found, re_class->nhs, (int) g_hash_table_size(re_class->re));
#endif
}

static gboolean
rspamd_re_cache_process_selector(struct rspamd_task *task,
								 struct rspamd_re_runtime *rt,
								 const char *name,
								 unsigned char ***svec,
								 unsigned int **lenvec,
								 unsigned int *n)
{
	int ref;
	khiter_t k;
	lua_State *L;
	int err_idx, ret;
	struct rspamd_task **ptask;
	gboolean result = FALSE;
	struct rspamd_re_cache *cache = rt->cache;
	struct rspamd_re_selector_result *sr;

	L = cache->L;
	k = kh_get(lua_selectors_hash, cache->selectors, (char *) name);

	if (k == kh_end(cache->selectors)) {
		msg_err_task("cannot find selector %s, not registered", name);

		return FALSE;
	}

	ref = kh_value(cache->selectors, k);

	/* First, search for the cached result */
	if (rt->sel_cache) {
		k = kh_get(selectors_results_hash, rt->sel_cache, ref);

		if (k != kh_end(rt->sel_cache)) {
			sr = &kh_value(rt->sel_cache, k);

			*svec = sr->scvec;
			*lenvec = sr->lenvec;
			*n = sr->cnt;

			return TRUE;
		}
	}
	else {
		rt->sel_cache = kh_init(selectors_results_hash);
	}

	lua_pushcfunction(L, &rspamd_lua_traceback);
	err_idx = lua_gettop(L);

	lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
	ptask = lua_newuserdata(L, sizeof(*ptask));
	*ptask = task;
	rspamd_lua_setclass(L, rspamd_task_classname, -1);

	if ((ret = lua_pcall(L, 1, 1, err_idx)) != 0) {
		msg_err_task("call to selector %s "
					 "failed (%d): %s",
					 name, ret,
					 lua_tostring(L, -1));
	}
	else {
		struct rspamd_lua_text *txt;
		gsize slen;
		const char *sel_data;

		if (lua_type(L, -1) != LUA_TTABLE) {
			txt = lua_check_text_or_string(L, -1);


			if (txt) {
				msg_debug_re_cache("re selector %s returned 1 element", name);
				sel_data = txt->start;
				slen = txt->len;
				*n = 1;
				*svec = g_malloc(sizeof(unsigned char *));
				*lenvec = g_malloc(sizeof(unsigned int));
				(*svec)[0] = g_malloc(slen);
				memcpy((*svec)[0], sel_data, slen);
				(*lenvec)[0] = slen;
				result = TRUE;
			}
			else {
				msg_debug_re_cache("re selector %s returned NULL", name);
			}
		}
		else {
			*n = rspamd_lua_table_size(L, -1);

			msg_debug_re_cache("re selector %s returned %d elements", name, *n);

			if (*n > 0) {
				*svec = g_malloc(sizeof(unsigned char *) * (*n));
				*lenvec = g_malloc(sizeof(unsigned int) * (*n));

				for (int i = 0; i < *n; i++) {
					lua_rawgeti(L, -1, i + 1);

					txt = lua_check_text_or_string(L, -1);
					if (txt && txt->len > 0) {
						sel_data = txt->start;
						slen = txt->len;
						(*svec)[i] = g_malloc(slen);
						memcpy((*svec)[i], sel_data, slen);
					}
					else {
						/* A hack to avoid malloc(0) */
						sel_data = "";
						slen = 0;
						(*svec)[i] = g_malloc(1);
						memcpy((*svec)[i], sel_data, 1);
					}

					(*lenvec)[i] = slen;
					lua_pop(L, 1);
				}
			}

			/* Empty table is also a valid result */
			result = TRUE;
		}
	}

	lua_settop(L, err_idx - 1);

	if (result) {
		k = kh_put(selectors_results_hash, rt->sel_cache, ref, &ret);
		sr = &kh_value(rt->sel_cache, k);

		sr->cnt = *n;
		sr->scvec = *svec;
		sr->lenvec = *lenvec;
	}

	return result;
}

static inline unsigned int
rspamd_process_words_vector(GArray *words,
							const unsigned char **scvec,
							unsigned int *lenvec,
							struct rspamd_re_class *re_class,
							unsigned int cnt,
							gboolean *raw)
{
	unsigned int j;
	rspamd_stat_token_t *tok;

	if (words) {
		for (j = 0; j < words->len; j++) {
			tok = &g_array_index(words, rspamd_stat_token_t, j);

			if (tok->flags & RSPAMD_STAT_TOKEN_FLAG_TEXT) {
				if (!(tok->flags & RSPAMD_STAT_TOKEN_FLAG_UTF)) {
					if (!re_class->has_utf8) {
						*raw = TRUE;
					}
					else {
						continue; /* Skip */
					}
				}
			}
			else {
				continue; /* Skip non text */
			}

			if (re_class->type == RSPAMD_RE_RAWWORDS) {
				if (tok->original.len > 0) {
					scvec[cnt] = tok->original.begin;
					lenvec[cnt++] = tok->original.len;
				}
			}
			else if (re_class->type == RSPAMD_RE_WORDS) {
				if (tok->normalized.len > 0) {
					scvec[cnt] = tok->normalized.begin;
					lenvec[cnt++] = tok->normalized.len;
				}
			}
			else {
				/* Stemmed words */
				if (tok->stemmed.len > 0) {
					scvec[cnt] = tok->stemmed.begin;
					lenvec[cnt++] = tok->stemmed.len;
				}
			}
		}
	}

	return cnt;
}

static unsigned int
rspamd_re_cache_process_headers_list(struct rspamd_task *task,
									 struct rspamd_re_runtime *rt,
									 rspamd_regexp_t *re,
									 struct rspamd_re_class *re_class,
									 struct rspamd_mime_header *rh,
									 gboolean is_strong,
									 gboolean *processed_hyperscan)
{
	const unsigned char **scvec, *in;
	gboolean raw = FALSE;
	unsigned int *lenvec;
	struct rspamd_mime_header *cur;
	unsigned int cnt = 0, i = 0, ret = 0;

	DL_COUNT(rh, cur, cnt);

	scvec = g_malloc(sizeof(*scvec) * cnt);
	lenvec = g_malloc(sizeof(*lenvec) * cnt);

	DL_FOREACH(rh, cur)
	{

		if (is_strong && strcmp(cur->name, re_class->type_data) != 0) {
			/* Skip a different case */
			continue;
		}

		if (re_class->type == RSPAMD_RE_RAWHEADER) {
			in = (const unsigned char *) cur->value;
			lenvec[i] = strlen(cur->value);

			if (rspamd_fast_utf8_validate(in, lenvec[i]) != 0) {
				raw = TRUE;
			}
		}
		else {
			in = (const unsigned char *) cur->decoded;
			/* Validate input^W^WNo need to validate as it is already valid */
			if (!in) {
				lenvec[i] = 0;
				scvec[i] = (unsigned char *) "";
				continue;
			}

			lenvec[i] = strlen(in);
		}

		scvec[i] = in;

		i++;
	}

	if (i > 0) {
		ret = rspamd_re_cache_process_regexp_data(rt, re,
												  task, scvec, lenvec, i, raw, processed_hyperscan);
		msg_debug_re_task("checking header %s regexp: %s=%*s -> %d",
						  re_class->type_data,
						  rspamd_regexp_get_pattern(re),
						  (int) lenvec[0], scvec[0], ret);
	}

	g_free(scvec);
	g_free(lenvec);

	return ret;
}

/*
 * Calculates the specified regexp for the specified class if it's not calculated
 */
static unsigned int
rspamd_re_cache_exec_re(struct rspamd_task *task,
						struct rspamd_re_runtime *rt,
						rspamd_regexp_t *re,
						struct rspamd_re_class *re_class,
						gboolean is_strong)
{
	unsigned int ret = 0, i, re_id;
	struct rspamd_mime_header *rh;
	const char *in;
	const unsigned char **scvec = NULL;
	unsigned int *lenvec = NULL;
	gboolean raw = FALSE, processed_hyperscan = FALSE;
	struct rspamd_mime_text_part *text_part;
	struct rspamd_mime_part *mime_part;
	struct rspamd_url *url;
	unsigned int len = 0, cnt = 0;
	const char *class_name;

	class_name = rspamd_re_cache_type_to_string(re_class->type);
	msg_debug_re_task("start check re type: %s: /%s/",
					  class_name,
					  rspamd_regexp_get_pattern(re));
	re_id = rspamd_regexp_get_cache_id(re);

	switch (re_class->type) {
	case RSPAMD_RE_HEADER:
	case RSPAMD_RE_RAWHEADER:
		/* Get list of specified headers */
		rh = rspamd_message_get_header_array(task,
											 re_class->type_data, FALSE);

		if (rh) {
			ret = rspamd_re_cache_process_headers_list(task, rt, re,
													   re_class, rh, is_strong, &processed_hyperscan);
			msg_debug_re_task("checked header(%s) regexp: %s -> %d",
							  (const char *) re_class->type_data,
							  rspamd_regexp_get_pattern(re),
							  ret);
		}
		break;
	case RSPAMD_RE_ALLHEADER:
		raw = TRUE;
		in = MESSAGE_FIELD(task, raw_headers_content).begin;
		len = MESSAGE_FIELD(task, raw_headers_content).len;
		ret = rspamd_re_cache_process_regexp_data(rt, re,
												  task, (const unsigned char **) &in, &len, 1, raw, &processed_hyperscan);
		msg_debug_re_task("checked allheader regexp: %s -> %d",
						  rspamd_regexp_get_pattern(re), ret);
		break;
	case RSPAMD_RE_MIMEHEADER:
		PTR_ARRAY_FOREACH(MESSAGE_FIELD(task, parts), i, mime_part)
		{
			if (mime_part->parent_part == NULL ||
				!IS_PART_MULTIPART(mime_part->parent_part) ||
				IS_PART_MESSAGE(mime_part)) {
				/* We filter parts that have no multipart parent or are a messages here */
				continue;
			}
			rh = rspamd_message_get_header_from_hash(mime_part->raw_headers,
													 re_class->type_data, FALSE);

			if (rh) {
				ret += rspamd_re_cache_process_headers_list(task, rt, re,
															re_class, rh, is_strong, &processed_hyperscan);
			}
			msg_debug_re_task("checked mime header(%s) regexp: %s -> %d",
							  (const char *) re_class->type_data,
							  rspamd_regexp_get_pattern(re),
							  ret);
		}
		break;
	case RSPAMD_RE_MIME:
	case RSPAMD_RE_RAWMIME:
		/* Iterate through text parts */
		if (MESSAGE_FIELD(task, text_parts)->len > 0) {
			cnt = MESSAGE_FIELD(task, text_parts)->len;
			scvec = g_malloc(sizeof(*scvec) * cnt);
			lenvec = g_malloc(sizeof(*lenvec) * cnt);

			PTR_ARRAY_FOREACH(MESSAGE_FIELD(task, text_parts), i, text_part)
			{
				/* Select data for regexp */
				if (re_class->type == RSPAMD_RE_RAWMIME) {
					if (text_part->raw.len == 0) {
						len = 0;
						in = "";
					}
					else {
						in = text_part->raw.begin;
						len = text_part->raw.len;
					}

					raw = TRUE;
				}
				else {
					/* Skip empty parts */
					if (IS_TEXT_PART_EMPTY(text_part)) {
						len = 0;
						in = "";
					}
					else {
						/* Check raw flags */
						if (!IS_TEXT_PART_UTF(text_part)) {
							raw = TRUE;
						}

						in = text_part->utf_content.begin;
						len = text_part->utf_content.len;
					}
				}

				scvec[i] = (unsigned char *) in;
				lenvec[i] = len;
			}

			ret = rspamd_re_cache_process_regexp_data(rt, re,
													  task, scvec, lenvec, cnt, raw, &processed_hyperscan);
			msg_debug_re_task("checked mime regexp: %s -> %d",
							  rspamd_regexp_get_pattern(re), ret);
			g_free(scvec);
			g_free(lenvec);
		}
		break;
	case RSPAMD_RE_URL:
		cnt = kh_size(MESSAGE_FIELD(task, urls));

		if (cnt > 0) {
			scvec = g_malloc(sizeof(*scvec) * cnt);
			lenvec = g_malloc(sizeof(*lenvec) * cnt);
			i = 0;
			raw = FALSE;

			kh_foreach_key(MESSAGE_FIELD(task, urls), url, {
				if ((url->protocol & PROTOCOL_MAILTO)) {
					continue;
				}
				in = url->string;
				len = url->urllen;

				if (len > 0 && !(url->flags & RSPAMD_URL_FLAG_IMAGE)) {
					scvec[i] = (unsigned char *) in;
					lenvec[i++] = len;
				}
			});

			/* URL regexps do not include emails, that's why the code below is commented */
#if 0
			g_hash_table_iter_init (&it, MESSAGE_FIELD (task, emails));

			while (g_hash_table_iter_next (&it, &k, &v)) {
				url = v;
				in = url->string;
				len = url->urllen;

				if (len > 0 && !(url->flags & RSPAMD_URL_FLAG_IMAGE)) {
					scvec[i] = (unsigned char *) in;
					lenvec[i++] = len;
				}
			}
#endif
			ret = rspamd_re_cache_process_regexp_data(rt, re,
													  task, scvec, lenvec, i, raw, &processed_hyperscan);
			msg_debug_re_task("checked url regexp: %s -> %d",
							  rspamd_regexp_get_pattern(re), ret);
			g_free(scvec);
			g_free(lenvec);
		}
		break;
	case RSPAMD_RE_EMAIL:
		cnt = kh_size(MESSAGE_FIELD(task, urls));

		if (cnt > 0) {
			scvec = g_malloc(sizeof(*scvec) * cnt);
			lenvec = g_malloc(sizeof(*lenvec) * cnt);
			i = 0;
			raw = FALSE;

			kh_foreach_key(MESSAGE_FIELD(task, urls), url, {
				if (!(url->protocol & PROTOCOL_MAILTO)) {
					continue;
				}
				if (url->userlen == 0 || url->hostlen == 0) {
					continue;
				}

				in = rspamd_url_user_unsafe(url);
				len = url->userlen + 1 + url->hostlen;
				scvec[i] = (unsigned char *) in;
				lenvec[i++] = len;
			});

			ret = rspamd_re_cache_process_regexp_data(rt, re,
													  task, scvec, lenvec, i, raw, &processed_hyperscan);
			msg_debug_re_task("checked email regexp: %s -> %d",
							  rspamd_regexp_get_pattern(re), ret);
			g_free(scvec);
			g_free(lenvec);
		}
		break;
	case RSPAMD_RE_BODY:
		raw = TRUE;
		in = task->msg.begin;
		len = task->msg.len;

		ret = rspamd_re_cache_process_regexp_data(rt, re, task,
												  (const unsigned char **) &in, &len, 1, raw, &processed_hyperscan);
		msg_debug_re_task("checked rawbody regexp: %s -> %d",
						  rspamd_regexp_get_pattern(re), ret);
		break;
	case RSPAMD_RE_SABODY:
		/* According to SA docs:
		 * The 'body' in this case is the textual parts of the message body;
		 * any non-text MIME parts are stripped, and the message decoded from
		 * Quoted-Printable or Base-64-encoded format if necessary. The message
		 * Subject header is considered part of the body and becomes the first
		 * paragraph when running the rules. All HTML tags and line breaks will
		 * be removed before matching.
		 */
		cnt = MESSAGE_FIELD(task, text_parts)->len + 1;
		scvec = g_malloc(sizeof(*scvec) * cnt);
		lenvec = g_malloc(sizeof(*lenvec) * cnt);

		/*
		 * Body rules also include the Subject as the first line
		 * of the body content.
		 */

		rh = rspamd_message_get_header_array(task, "Subject", FALSE);

		if (rh) {
			scvec[0] = (unsigned char *) rh->decoded;
			lenvec[0] = strlen(rh->decoded);
		}
		else {
			scvec[0] = (unsigned char *) "";
			lenvec[0] = 0;
		}

		PTR_ARRAY_FOREACH(MESSAGE_FIELD(task, text_parts), i, text_part)
		{
			if (text_part->utf_stripped_content) {
				scvec[i + 1] = (unsigned char *) text_part->utf_stripped_content->data;
				lenvec[i + 1] = text_part->utf_stripped_content->len;

				if (!IS_TEXT_PART_UTF(text_part)) {
					raw = TRUE;
				}
			}
			else {
				scvec[i + 1] = (unsigned char *) "";
				lenvec[i + 1] = 0;
			}
		}

		ret = rspamd_re_cache_process_regexp_data(rt, re,
												  task, scvec, lenvec, cnt, raw, &processed_hyperscan);
		msg_debug_re_task("checked sa body regexp: %s -> %d",
						  rspamd_regexp_get_pattern(re), ret);
		g_free(scvec);
		g_free(lenvec);
		break;
	case RSPAMD_RE_SARAWBODY:
		/* According to SA docs:
		 * The 'raw body' of a message is the raw data inside all textual
		 * parts. The text will be decoded from base64 or quoted-printable
		 * encoding, but HTML tags and line breaks will still be present.
		 * Multiline expressions will need to be used to match strings that are
		 * broken by line breaks.
		 */
		if (MESSAGE_FIELD(task, text_parts)->len > 0) {
			cnt = MESSAGE_FIELD(task, text_parts)->len;
			scvec = g_malloc(sizeof(*scvec) * cnt);
			lenvec = g_malloc(sizeof(*lenvec) * cnt);

			for (i = 0; i < cnt; i++) {
				text_part = g_ptr_array_index(MESSAGE_FIELD(task, text_parts), i);

				if (text_part->parsed.len > 0) {
					scvec[i] = (unsigned char *) text_part->parsed.begin;
					lenvec[i] = text_part->parsed.len;

					if (!IS_TEXT_PART_UTF(text_part)) {
						raw = TRUE;
					}
				}
				else {
					scvec[i] = (unsigned char *) "";
					lenvec[i] = 0;
				}
			}

			ret = rspamd_re_cache_process_regexp_data(rt, re,
													  task, scvec, lenvec, cnt, raw, &processed_hyperscan);
			msg_debug_re_task("checked sa rawbody regexp: %s -> %d",
							  rspamd_regexp_get_pattern(re), ret);
			g_free(scvec);
			g_free(lenvec);
		}
		break;
	case RSPAMD_RE_WORDS:
	case RSPAMD_RE_STEMWORDS:
	case RSPAMD_RE_RAWWORDS:
		if (MESSAGE_FIELD(task, text_parts)->len > 0) {
			cnt = 0;
			raw = FALSE;

			PTR_ARRAY_FOREACH(MESSAGE_FIELD(task, text_parts), i, text_part)
			{
				if (text_part->utf_words) {
					cnt += text_part->utf_words->len;
				}
			}

			if (task->meta_words && task->meta_words->len > 0) {
				cnt += task->meta_words->len;
			}

			if (cnt > 0) {
				scvec = g_malloc(sizeof(*scvec) * cnt);
				lenvec = g_malloc(sizeof(*lenvec) * cnt);

				cnt = 0;

				PTR_ARRAY_FOREACH(MESSAGE_FIELD(task, text_parts), i, text_part)
				{
					if (text_part->utf_words) {
						cnt = rspamd_process_words_vector(text_part->utf_words,
														  scvec, lenvec, re_class, cnt, &raw);
					}
				}

				if (task->meta_words) {
					cnt = rspamd_process_words_vector(task->meta_words,
													  scvec, lenvec, re_class, cnt, &raw);
				}

				ret = rspamd_re_cache_process_regexp_data(rt, re,
														  task, scvec, lenvec, cnt, raw, &processed_hyperscan);

				msg_debug_re_task("checked sa words regexp: %s -> %d",
								  rspamd_regexp_get_pattern(re), ret);
				g_free(scvec);
				g_free(lenvec);
			}
		}
		break;
	case RSPAMD_RE_SELECTOR:
		if (rspamd_re_cache_process_selector(task, rt,
											 re_class->type_data,
											 (unsigned char ***) &scvec,
											 &lenvec, &cnt)) {

			ret = rspamd_re_cache_process_regexp_data(rt, re,
													  task, scvec, lenvec, cnt, raw, &processed_hyperscan);
			msg_debug_re_task("checked selector(%s) regexp: %s -> %d",
							  re_class->type_data,
							  rspamd_regexp_get_pattern(re), ret);

			/* Do not free vectors as they are managed by rt->sel_cache */
		}
		break;
	case RSPAMD_RE_MAX:
		msg_err_task("regexp of class invalid has been called: %s",
					 rspamd_regexp_get_pattern(re));
		break;
	}

#if WITH_HYPERSCAN
	if (processed_hyperscan) {
		rspamd_re_cache_finish_class(task, rt, re_class, class_name);
	}
#endif

	setbit(rt->checked, re_id);

	return rt->results[re_id];
}

int rspamd_re_cache_process(struct rspamd_task *task,
							rspamd_regexp_t *re,
							enum rspamd_re_type type,
							gconstpointer type_data,
							gsize datalen,
							gboolean is_strong)
{
	uint64_t re_id;
	struct rspamd_re_class *re_class;
	struct rspamd_re_cache *cache;
	struct rspamd_re_runtime *rt;

	g_assert(task != NULL);
	rt = task->re_rt;
	g_assert(rt != NULL);
	g_assert(re != NULL);

	cache = rt->cache;
	re_id = rspamd_regexp_get_cache_id(re);

	if (re_id == RSPAMD_INVALID_ID || re_id > cache->nre) {
		msg_err_task("re '%s' has no valid id for the cache",
					 rspamd_regexp_get_pattern(re));
		return 0;
	}

	if (isset(rt->checked, re_id)) {
		/* Fast path */
		rt->stat.regexp_fast_cached++;
		return rt->results[re_id];
	}
	else {
		/* Slow path */
		re_class = rspamd_regexp_get_class(re);

		if (re_class == NULL) {
			msg_err_task("cannot find re class for regexp '%s'",
						 rspamd_regexp_get_pattern(re));
			return 0;
		}

		return rspamd_re_cache_exec_re(task, rt, re, re_class,
									   is_strong);
	}

	return 0;
}

int rspamd_re_cache_process_ffi(void *ptask,
								void *pre,
								int type,
								void *type_data,
								int is_strong)
{
	struct rspamd_lua_regexp **lua_re = pre;
	struct rspamd_task **real_task = ptask;
	gsize typelen = 0;

	if (type_data) {
		typelen = strlen(type_data);
	}

	return rspamd_re_cache_process(*real_task, (*lua_re)->re,
								   type, type_data, typelen, is_strong);
}

void rspamd_re_cache_runtime_destroy(struct rspamd_re_runtime *rt)
{
	g_assert(rt != NULL);

	if (rt->sel_cache) {
		struct rspamd_re_selector_result sr;

		kh_foreach_value(rt->sel_cache, sr, {
			for (unsigned int i = 0; i < sr.cnt; i++) {
				g_free((gpointer) sr.scvec[i]);
			}

			g_free(sr.scvec);
			g_free(sr.lenvec);
		});
		kh_destroy(selectors_results_hash, rt->sel_cache);
	}

	REF_RELEASE(rt->cache);
	g_free(rt);
}

void rspamd_re_cache_unref(struct rspamd_re_cache *cache)
{
	if (cache) {
		REF_RELEASE(cache);
	}
}

struct rspamd_re_cache *
rspamd_re_cache_ref(struct rspamd_re_cache *cache)
{
	if (cache) {
		REF_RETAIN(cache);
	}

	return cache;
}

unsigned int rspamd_re_cache_set_limit(struct rspamd_re_cache *cache, unsigned int limit)
{
	unsigned int old;

	g_assert(cache != NULL);

	old = cache->max_re_data;
	cache->max_re_data = limit;

	return old;
}

const char *
rspamd_re_cache_type_to_string(enum rspamd_re_type type)
{
	const char *ret = "unknown";

	switch (type) {
	case RSPAMD_RE_HEADER:
		ret = "header";
		break;
	case RSPAMD_RE_RAWHEADER:
		ret = "raw header";
		break;
	case RSPAMD_RE_MIMEHEADER:
		ret = "mime header";
		break;
	case RSPAMD_RE_ALLHEADER:
		ret = "all headers";
		break;
	case RSPAMD_RE_MIME:
		ret = "part";
		break;
	case RSPAMD_RE_RAWMIME:
		ret = "raw part";
		break;
	case RSPAMD_RE_BODY:
		ret = "rawbody";
		break;
	case RSPAMD_RE_URL:
		ret = "url";
		break;
	case RSPAMD_RE_EMAIL:
		ret = "email";
		break;
	case RSPAMD_RE_SABODY:
		ret = "sa body";
		break;
	case RSPAMD_RE_SARAWBODY:
		ret = "sa raw body";
		break;
	case RSPAMD_RE_SELECTOR:
		ret = "selector";
		break;
	case RSPAMD_RE_WORDS:
		ret = "words";
		break;
	case RSPAMD_RE_RAWWORDS:
		ret = "raw_words";
		break;
	case RSPAMD_RE_STEMWORDS:
		ret = "stem_words";
		break;
	case RSPAMD_RE_MAX:
	default:
		ret = "invalid class";
		break;
	}

	return ret;
}

enum rspamd_re_type
rspamd_re_cache_type_from_string(const char *str)
{
	enum rspamd_re_type ret;
	uint64_t h;

	/*
	 * To optimize this function, we apply hash to input string and
	 * pre-select it from the values
	 */

	if (str != NULL) {
		h = rspamd_cryptobox_fast_hash_specific(RSPAMD_CRYPTOBOX_XXHASH64,
												str, strlen(str), 0xdeadbabe);

		switch (h) {
		case G_GUINT64_CONSTANT(0x298b9c8a58887d44): /* header */
			ret = RSPAMD_RE_HEADER;
			break;
		case G_GUINT64_CONSTANT(0x467bfb5cd7ddf890): /* rawheader */
			ret = RSPAMD_RE_RAWHEADER;
			break;
		case G_GUINT64_CONSTANT(0xda081341fb600389): /* mime */
			ret = RSPAMD_RE_MIME;
			break;
		case G_GUINT64_CONSTANT(0xc35831e067a8221d): /* rawmime */
			ret = RSPAMD_RE_RAWMIME;
			break;
		case G_GUINT64_CONSTANT(0xc625e13dbe636de2): /* body */
		case G_GUINT64_CONSTANT(0xCCDEBA43518F721C): /* message */
			ret = RSPAMD_RE_BODY;
			break;
		case G_GUINT64_CONSTANT(0x286edbe164c791d2): /* url */
		case G_GUINT64_CONSTANT(0x7D9ACDF6685661A1): /* uri */
			ret = RSPAMD_RE_URL;
			break;
		case G_GUINT64_CONSTANT(0x7e232b0f60b571be): /* email */
			ret = RSPAMD_RE_EMAIL;
			break;
		case G_GUINT64_CONSTANT(0x796d62205a8778c7): /* allheader */
			ret = RSPAMD_RE_ALLHEADER;
			break;
		case G_GUINT64_CONSTANT(0xa3c6c153b3b00a5e): /* mimeheader */
			ret = RSPAMD_RE_MIMEHEADER;
			break;
		case G_GUINT64_CONSTANT(0x7794501506e604e9): /* sabody */
			ret = RSPAMD_RE_SABODY;
			break;
		case G_GUINT64_CONSTANT(0x28828962E7D2A05F): /* sarawbody */
			ret = RSPAMD_RE_SARAWBODY;
			break;
		default:
			ret = RSPAMD_RE_MAX;
			break;
		}
	}
	else {
		ret = RSPAMD_RE_MAX;
	}

	return ret;
}

#ifdef WITH_HYPERSCAN
static char *
rspamd_re_cache_hs_pattern_from_pcre(rspamd_regexp_t *re)
{
	/*
	 * Workaround for bug in ragel 7.0.0.11
	 * https://github.com/intel/hyperscan/issues/133
	 */
	const char *pat = rspamd_regexp_get_pattern(re);
	unsigned int flags = rspamd_regexp_get_flags(re), esc_flags = RSPAMD_REGEXP_ESCAPE_RE;
	char *escaped;
	gsize esc_len;

	if (flags & RSPAMD_REGEXP_FLAG_UTF) {
		esc_flags |= RSPAMD_REGEXP_ESCAPE_UTF;
	}

	escaped = rspamd_str_regexp_escape(pat, strlen(pat), &esc_len, esc_flags);

	return escaped;
}

static gboolean
rspamd_re_cache_is_finite(struct rspamd_re_cache *cache,
						  rspamd_regexp_t *re, int flags, double max_time)
{
	pid_t cld;
	int status;
	struct timespec ts;
	hs_compile_error_t *hs_errors;
	hs_database_t *test_db;
	double wait_time;
	const int max_tries = 10;
	int tries = 0, rc;
	void (*old_hdl)(int);

	wait_time = max_time / max_tries;
	/* We need to restore SIGCHLD processing */
	old_hdl = signal(SIGCHLD, SIG_DFL);
	cld = fork();

	if (cld == 0) {
		/* Try to compile pattern */

		char *pat = rspamd_re_cache_hs_pattern_from_pcre(re);

		if (hs_compile(pat,
					   flags | HS_FLAG_PREFILTER,
					   HS_MODE_BLOCK,
					   &cache->plt,
					   &test_db,
					   &hs_errors) != HS_SUCCESS) {

			msg_info_re_cache("cannot compile (prefilter mode) '%s' to hyperscan: '%s'",
							  pat,
							  hs_errors != NULL ? hs_errors->message : "unknown error");

			hs_free_compile_error(hs_errors);
			g_free(pat);

			exit(EXIT_FAILURE);
		}

		g_free(pat);
		exit(EXIT_SUCCESS);
	}
	else if (cld > 0) {
		double_to_ts(wait_time, &ts);

		while ((rc = waitpid(cld, &status, WNOHANG)) == 0 && tries++ < max_tries) {
			(void) nanosleep(&ts, NULL);
		}

		/* Child has been terminated */
		if (rc > 0) {
			/* Forget about SIGCHLD after this point */
			signal(SIGCHLD, old_hdl);

			if (WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS) {
				return TRUE;
			}
			else {
				msg_err_re_cache(
					"cannot approximate %s to hyperscan",
					rspamd_regexp_get_pattern(re));

				return FALSE;
			}
		}
		else {
			/* We consider that as timeout */
			kill(cld, SIGKILL);
			g_assert(waitpid(cld, &status, 0) != -1);
			msg_err_re_cache(
				"cannot approximate %s to hyperscan: timeout waiting",
				rspamd_regexp_get_pattern(re));
			signal(SIGCHLD, old_hdl);
		}
	}
	else {
		msg_err_re_cache(
			"cannot approximate %s to hyperscan: fork failed: %s",
			rspamd_regexp_get_pattern(re), strerror(errno));
		signal(SIGCHLD, old_hdl);
	}

	return FALSE;
}
#endif

#ifdef WITH_HYPERSCAN
struct rspamd_re_cache_hs_compile_cbdata {
	GHashTableIter it;
	struct rspamd_re_cache *cache;
	const char *cache_dir;
	double max_time;
	gboolean silent;
	unsigned int total;
	void (*cb)(unsigned int ncompiled, GError *err, void *cbd);
	void *cbd;
};

static void
rspamd_re_cache_compile_err(EV_P_ ev_timer *w, GError *err,
							struct rspamd_re_cache_hs_compile_cbdata *cbdata, bool is_fatal)
{
	cbdata->cb(cbdata->total, err, cbdata->cbd);

	if (is_fatal) {
		ev_timer_stop(EV_A_ w);
		g_free(w);
		g_free(cbdata);
	}
	else {
		/* Continue compilation */
		ev_timer_again(EV_A_ w);
	}
	g_error_free(err);
}

static void
rspamd_re_cache_compile_timer_cb(EV_P_ ev_timer *w, int revents)
{
	struct rspamd_re_cache_hs_compile_cbdata *cbdata =
		(struct rspamd_re_cache_hs_compile_cbdata *) w->data;
	GHashTableIter cit;
	gpointer k, v;
	struct rspamd_re_class *re_class;
	char path[PATH_MAX], npath[PATH_MAX];
	hs_database_t *test_db;
	int fd, i, n, *hs_ids = NULL, pcre_flags, re_flags;
	rspamd_cryptobox_fast_hash_state_t crc_st;
	uint64_t crc;
	rspamd_regexp_t *re;
	hs_compile_error_t *hs_errors = NULL;
	unsigned int *hs_flags = NULL;
	const hs_expr_ext_t **hs_exts = NULL;
	char **hs_pats = NULL;
	char *hs_serialized = NULL;
	gsize serialized_len;
	struct iovec iov[7];
	struct rspamd_re_cache *cache;
	GError *err;
	pid_t our_pid = getpid();

	cache = cbdata->cache;

	if (!g_hash_table_iter_next(&cbdata->it, &k, &v)) {
		/* All done */
		ev_timer_stop(EV_A_ w);
		cbdata->cb(cbdata->total, NULL, cbdata->cbd);
		g_free(w);
		g_free(cbdata);

		return;
	}

	re_class = v;
	rspamd_snprintf(path, sizeof(path), "%s%c%s.hs", cbdata->cache_dir,
					G_DIR_SEPARATOR, re_class->hash);

	if (rspamd_re_cache_is_valid_hyperscan_file(cache, path, TRUE, TRUE, NULL)) {

		fd = open(path, O_RDONLY, 00600);

		/* Read number of regexps */
		g_assert(fd != -1);
		g_assert(lseek(fd, RSPAMD_HS_MAGIC_LEN + sizeof(cache->plt), SEEK_SET) != -1);
		g_assert(read(fd, &n, sizeof(n)) == sizeof(n));
		close(fd);

		if (re_class->type_len > 0) {
			if (!cbdata->silent) {
				msg_info_re_cache(
					"skip already valid class %s(%*s) to cache %6s, %d regexps",
					rspamd_re_cache_type_to_string(re_class->type),
					(int) re_class->type_len - 1,
					re_class->type_data,
					re_class->hash,
					n);
			}
		}
		else {
			if (!cbdata->silent) {
				msg_info_re_cache(
					"skip already valid class %s to cache %6s, %d regexps",
					rspamd_re_cache_type_to_string(re_class->type),
					re_class->hash,
					n);
			}
		}

		ev_timer_again(EV_A_ w);
		return;
	}

	rspamd_snprintf(path, sizeof(path), "%s%c%s%P-XXXXXXXXXX", cbdata->cache_dir,
					G_DIR_SEPARATOR, re_class->hash, our_pid);
	fd = g_mkstemp_full(path, O_CREAT | O_TRUNC | O_EXCL | O_WRONLY, 00600);

	if (fd == -1) {
		err = g_error_new(rspamd_re_cache_quark(), errno,
						  "cannot open file %s: %s", path, strerror(errno));
		rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);
		return;
	}

	g_hash_table_iter_init(&cit, re_class->re);
	n = g_hash_table_size(re_class->re);
	hs_flags = g_new0(unsigned int, n);
	hs_ids = g_new0(unsigned int, n);
	hs_pats = g_new0(char *, n);
	hs_exts = g_new0(const hs_expr_ext_t *, n);
	i = 0;

	while (g_hash_table_iter_next(&cit, &k, &v)) {
		re = v;

		pcre_flags = rspamd_regexp_get_pcre_flags(re);
		re_flags = rspamd_regexp_get_flags(re);

		if (re_flags & RSPAMD_REGEXP_FLAG_PCRE_ONLY) {
			/* Do not try to compile bad regexp */
			msg_info_re_cache(
				"do not try compile %s to hyperscan as it is PCRE only",
				rspamd_regexp_get_pattern(re));
			continue;
		}

		hs_flags[i] = 0;
		hs_exts[i] = NULL;
#ifndef WITH_PCRE2
		if (pcre_flags & PCRE_FLAG(UTF8)) {
			hs_flags[i] |= HS_FLAG_UTF8;
		}
#else
		if (pcre_flags & PCRE_FLAG(UTF)) {
			hs_flags[i] |= HS_FLAG_UTF8;
		}
#endif
		if (pcre_flags & PCRE_FLAG(CASELESS)) {
			hs_flags[i] |= HS_FLAG_CASELESS;
		}
		if (pcre_flags & PCRE_FLAG(MULTILINE)) {
			hs_flags[i] |= HS_FLAG_MULTILINE;
		}
		if (pcre_flags & PCRE_FLAG(DOTALL)) {
			hs_flags[i] |= HS_FLAG_DOTALL;
		}


		if (re_flags & RSPAMD_REGEXP_FLAG_LEFTMOST) {
			hs_flags[i] |= HS_FLAG_SOM_LEFTMOST;
		}
		else if (rspamd_regexp_get_maxhits(re) == 1) {
			hs_flags[i] |= HS_FLAG_SINGLEMATCH;
		}

		char *pat = rspamd_re_cache_hs_pattern_from_pcre(re);

		if (hs_compile(pat,
					   hs_flags[i],
					   HS_MODE_BLOCK,
					   &cache->plt,
					   &test_db,
					   &hs_errors) != HS_SUCCESS) {
			msg_info_re_cache("cannot compile '%s' to hyperscan: '%s', try prefilter match",
							  pat,
							  hs_errors != NULL ? hs_errors->message : "unknown error");
			hs_free_compile_error(hs_errors);

			/* The approximation operation might take a significant
			 * amount of time, so we need to check if it's finite
			 */
			if (rspamd_re_cache_is_finite(cache, re, hs_flags[i], cbdata->max_time)) {
				hs_flags[i] |= HS_FLAG_PREFILTER;
				hs_ids[i] = rspamd_regexp_get_cache_id(re);
				hs_pats[i] = pat;
				i++;
			}
			else {
				g_free(pat); /* Avoid leak */
			}
		}
		else {
			hs_ids[i] = rspamd_regexp_get_cache_id(re);
			hs_pats[i] = pat;
			i++;
			hs_free_database(test_db);
		}
	}
	/* Adjust real re number */
	n = i;

#define CLEANUP_ALLOCATED(is_err)                            \
	do {                                                     \
		g_free(hs_flags);                                    \
		g_free(hs_ids);                                      \
		for (unsigned int j = 0; j < i; j++) {               \
			g_free(hs_pats[j]);                              \
		}                                                    \
		g_free(hs_pats);                                     \
		g_free(hs_exts);                                     \
		if (is_err) {                                        \
			close(fd);                                       \
			unlink(path);                                    \
			if (hs_errors) hs_free_compile_error(hs_errors); \
		}                                                    \
	} while (0)

	if (n > 0) {
		/* Create the hs tree */
		hs_errors = NULL;
		if (hs_compile_ext_multi((const char **) hs_pats,
								 hs_flags,
								 hs_ids,
								 hs_exts,
								 n,
								 HS_MODE_BLOCK,
								 &cache->plt,
								 &test_db,
								 &hs_errors) != HS_SUCCESS) {

			err = g_error_new(rspamd_re_cache_quark(), EINVAL,
							  "cannot create tree of regexp when processing '%s': %s",
							  hs_pats[hs_errors->expression], hs_errors->message);
			CLEANUP_ALLOCATED(true);
			rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);

			return;
		}

		if (hs_serialize_database(test_db, &hs_serialized,
								  &serialized_len) != HS_SUCCESS) {
			err = g_error_new(rspamd_re_cache_quark(),
							  errno,
							  "cannot serialize tree of regexp for %s",
							  re_class->hash);

			CLEANUP_ALLOCATED(true);
			hs_free_database(test_db);
			rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);
			return;
		}

		hs_free_database(test_db);

		/*
		 * Magic - 8 bytes
		 * Platform - sizeof (platform)
		 * n - number of regexps
		 * n * <regexp ids>
		 * n * <regexp flags>
		 * crc - 8 bytes checksum
		 * <hyperscan blob>
		 */
		rspamd_cryptobox_fast_hash_init(&crc_st, 0xdeadbabe);
		/* IDs -> Flags -> Hs blob */
		rspamd_cryptobox_fast_hash_update(&crc_st,
										  hs_ids, sizeof(*hs_ids) * n);
		rspamd_cryptobox_fast_hash_update(&crc_st,
										  hs_flags, sizeof(*hs_flags) * n);
		rspamd_cryptobox_fast_hash_update(&crc_st,
										  hs_serialized, serialized_len);
		crc = rspamd_cryptobox_fast_hash_final(&crc_st);


		iov[0].iov_base = (void *) rspamd_hs_magic;
		iov[0].iov_len = RSPAMD_HS_MAGIC_LEN;
		iov[1].iov_base = &cache->plt;
		iov[1].iov_len = sizeof(cache->plt);
		iov[2].iov_base = &n;
		iov[2].iov_len = sizeof(n);
		iov[3].iov_base = hs_ids;
		iov[3].iov_len = sizeof(*hs_ids) * n;
		iov[4].iov_base = hs_flags;
		iov[4].iov_len = sizeof(*hs_flags) * n;
		iov[5].iov_base = &crc;
		iov[5].iov_len = sizeof(crc);
		iov[6].iov_base = hs_serialized;
		iov[6].iov_len = serialized_len;

		if (writev(fd, iov, G_N_ELEMENTS(iov)) == -1) {
			err = g_error_new(rspamd_re_cache_quark(),
							  errno,
							  "cannot serialize tree of regexp to %s: %s",
							  path, strerror(errno));

			CLEANUP_ALLOCATED(true);
			g_free(hs_serialized);

			rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);
			return;
		}

		if (re_class->type_len > 0) {
			msg_info_re_cache(
				"compiled class %s(%*s) to cache %6s, %d/%d regexps",
				rspamd_re_cache_type_to_string(re_class->type),
				(int) re_class->type_len - 1,
				re_class->type_data,
				re_class->hash,
				n,
				(int) g_hash_table_size(re_class->re));
		}
		else {
			msg_info_re_cache(
				"compiled class %s to cache %6s, %d/%d regexps",
				rspamd_re_cache_type_to_string(re_class->type),
				re_class->hash,
				n,
				(int) g_hash_table_size(re_class->re));
		}

		cbdata->total += n;
		CLEANUP_ALLOCATED(false);

		/* Now rename temporary file to the new .hs file */
		rspamd_snprintf(npath, sizeof(npath), "%s%c%s.hs", cbdata->cache_dir,
						G_DIR_SEPARATOR, re_class->hash);

		if (rename(path, npath) == -1) {
			err = g_error_new(rspamd_re_cache_quark(),
							  errno,
							  "cannot rename %s to %s: %s",
							  path, npath, strerror(errno));
			unlink(path);
			close(fd);

			rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);
			return;
		}

		close(fd);
	}
	else {
		err = g_error_new(rspamd_re_cache_quark(),
						  errno,
						  "no suitable regular expressions %s (%d original): "
						  "remove temporary file %s",
						  rspamd_re_cache_type_to_string(re_class->type),
						  (int) g_hash_table_size(re_class->re),
						  path);

		CLEANUP_ALLOCATED(true);
		rspamd_re_cache_compile_err(EV_A_ w, err, cbdata, false);

		return;
	}

	/* Continue process */
	ev_timer_again(EV_A_ w);
}

#endif

int rspamd_re_cache_compile_hyperscan(struct rspamd_re_cache *cache,
									  const char *cache_dir,
									  double max_time,
									  gboolean silent,
									  struct ev_loop *event_loop,
									  void (*cb)(unsigned int ncompiled, GError *err, void *cbd),
									  void *cbd)
{
	g_assert(cache != NULL);
	g_assert(cache_dir != NULL);

#ifndef WITH_HYPERSCAN
	return -1;
#else
	static ev_timer *timer;
	static const ev_tstamp timer_interval = 0.1;
	struct rspamd_re_cache_hs_compile_cbdata *cbdata;

	cbdata = g_malloc0(sizeof(*cbdata));
	g_hash_table_iter_init(&cbdata->it, cache->re_classes);
	cbdata->cache = cache;
	cbdata->cache_dir = cache_dir;
	cbdata->cb = cb;
	cbdata->cbd = cbd;
	cbdata->max_time = max_time;
	cbdata->silent = silent;
	cbdata->total = 0;
	timer = g_malloc0(sizeof(*timer));
	timer->data = (void *) cbdata; /* static */

	ev_timer_init(timer, rspamd_re_cache_compile_timer_cb,
				  timer_interval, timer_interval);
	ev_timer_start(event_loop, timer);

	return 0;
#endif
}

gboolean
rspamd_re_cache_is_valid_hyperscan_file(struct rspamd_re_cache *cache,
										const char *path, gboolean silent, gboolean try_load, GError **err)
{
	g_assert(cache != NULL);
	g_assert(path != NULL);

#ifndef WITH_HYPERSCAN
	return FALSE;
#else
	int fd, n, ret;
	unsigned char magicbuf[RSPAMD_HS_MAGIC_LEN];
	const unsigned char *mb;
	GHashTableIter it;
	gpointer k, v;
	struct rspamd_re_class *re_class;
	gsize len;
	const char *hash_pos;
	hs_platform_info_t test_plt;
	hs_database_t *test_db = NULL;
	unsigned char *map, *p, *end;
	rspamd_cryptobox_fast_hash_state_t crc_st;
	uint64_t crc, valid_crc;

	len = strlen(path);

	if (len < sizeof(rspamd_cryptobox_HASHBYTES + 3)) {
		if (!silent) {
			msg_err_re_cache("cannot open hyperscan cache file %s: too short filename",
							 path);
		}
		g_set_error(err, rspamd_re_cache_quark(), 0,
					"too short filename");

		return FALSE;
	}

	if (memcmp(path + len - 3, ".hs", 3) != 0) {
		if (!silent) {
			msg_err_re_cache("cannot open hyperscan cache file %s: not ending with .hs",
							 path);
		}
		g_set_error(err, rspamd_re_cache_quark(), 0,
					"not ending with .hs");
		return FALSE;
	}

	hash_pos = path + len - 3 - (sizeof(re_class->hash) - 1);
	g_hash_table_iter_init(&it, cache->re_classes);

	while (g_hash_table_iter_next(&it, &k, &v)) {
		re_class = v;

		if (memcmp(hash_pos, re_class->hash, sizeof(re_class->hash) - 1) == 0) {
			/* Open file and check magic */
			gssize r;

			fd = open(path, O_RDONLY);

			if (fd == -1) {
				if (errno != ENOENT || !silent) {
					msg_err_re_cache("cannot open hyperscan cache file %s: %s",
									 path, strerror(errno));
				}
				g_set_error(err, rspamd_re_cache_quark(), 0,
							"%s",
							strerror(errno));
				return FALSE;
			}

			if ((r = read(fd, magicbuf, sizeof(magicbuf))) != sizeof(magicbuf)) {
				if (r == -1) {
					msg_err_re_cache("cannot read magic from hyperscan "
									 "cache file %s: %s",
									 path, strerror(errno));
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"cannot read magic: %s",
								strerror(errno));
				}
				else {
					msg_err_re_cache("truncated read magic from hyperscan "
									 "cache file %s: %z, %z wanted",
									 path, r, (gsize) sizeof(magicbuf));
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"truncated read magic %zd, %zd wanted",
								r, (gsize) sizeof(magicbuf));
				}

				close(fd);
				return FALSE;
			}

			mb = rspamd_hs_magic;

			if (memcmp(magicbuf, mb, sizeof(magicbuf)) != 0) {
				msg_err_re_cache("cannot open hyperscan cache file %s: "
								 "bad magic ('%*xs', '%*xs' expected)",
								 path, (int) RSPAMD_HS_MAGIC_LEN, magicbuf,
								 (int) RSPAMD_HS_MAGIC_LEN, mb);

				close(fd);
				g_set_error(err, rspamd_re_cache_quark(), 0, "invalid magic");
				return FALSE;
			}

			if ((r = read(fd, &test_plt, sizeof(test_plt))) != sizeof(test_plt)) {
				if (r == -1) {
					msg_err_re_cache("cannot read platform data from hyperscan "
									 "cache file %s: %s",
									 path, strerror(errno));
				}
				else {
					msg_err_re_cache("truncated read platform data from hyperscan "
									 "cache file %s: %z, %z wanted",
									 path, r, (gsize) sizeof(magicbuf));
				}

				g_set_error(err, rspamd_re_cache_quark(), 0,
							"cannot read platform data: %s", strerror(errno));

				close(fd);
				return FALSE;
			}

			if (test_plt.cpu_features != cache->plt.cpu_features) {
				msg_err_re_cache("cannot open hyperscan cache file %s: "
								 "compiled for a different platform",
								 path);
				g_set_error(err, rspamd_re_cache_quark(), 0,
							"compiled for a different platform");

				close(fd);
				return FALSE;
			}

			close(fd);

			if (try_load) {
				map = rspamd_file_xmap(path, PROT_READ, &len, TRUE);

				if (map == NULL) {
					msg_err_re_cache("cannot mmap hyperscan cache file %s: "
									 "%s",
									 path, strerror(errno));
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"mmap error: %s", strerror(errno));
					return FALSE;
				}

				p = map + RSPAMD_HS_MAGIC_LEN + sizeof(test_plt);
				end = map + len;
				memcpy(&n, p, sizeof(n));
				p += sizeof(int);

				if (n <= 0 || 2 * n * sizeof(int) +         /* IDs + flags */
									  sizeof(uint64_t) +    /* crc */
									  RSPAMD_HS_MAGIC_LEN + /* header */
									  sizeof(cache->plt) >
								  len) {
					/* Some wrong amount of regexps */
					msg_err_re_cache("bad number of expressions in %s: %d",
									 path, n);
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"bad number of expressions: %d", n);
					munmap(map, len);
					return FALSE;
				}

				/*
				 * Magic - 8 bytes
				 * Platform - sizeof (platform)
				 * n - number of regexps
				 * n * <regexp ids>
				 * n * <regexp flags>
				 * crc - 8 bytes checksum
				 * <hyperscan blob>
				 */

				memcpy(&crc, p + n * 2 * sizeof(int), sizeof(crc));
				rspamd_cryptobox_fast_hash_init(&crc_st, 0xdeadbabe);
				/* IDs */
				rspamd_cryptobox_fast_hash_update(&crc_st, p, n * sizeof(int));
				/* Flags */
				rspamd_cryptobox_fast_hash_update(&crc_st, p + n * sizeof(int),
												  n * sizeof(int));
				/* HS database */
				p += n * sizeof(int) * 2 + sizeof(uint64_t);
				rspamd_cryptobox_fast_hash_update(&crc_st, p, end - p);
				valid_crc = rspamd_cryptobox_fast_hash_final(&crc_st);

				if (crc != valid_crc) {
					msg_warn_re_cache("outdated or invalid hs database in %s: "
									  "crc read %xL, crc expected %xL",
									  path, crc, valid_crc);
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"outdated or invalid hs database, crc check failure");
					munmap(map, len);

					return FALSE;
				}

				if ((ret = hs_deserialize_database(p, end - p, &test_db)) != HS_SUCCESS) {
					msg_err_re_cache("bad hs database in %s: %d", path, ret);
					g_set_error(err, rspamd_re_cache_quark(), 0,
								"deserialize error: %d", ret);
					munmap(map, len);

					return FALSE;
				}

				hs_free_database(test_db);
				munmap(map, len);
			}
			/* XXX: add crc check */

			return TRUE;
		}
	}

	if (!silent) {
		msg_warn_re_cache("unknown hyperscan cache file %s", path);
	}

	g_set_error(err, rspamd_re_cache_quark(), 0,
				"unknown hyperscan file");

	return FALSE;
#endif
}


enum rspamd_hyperscan_status
rspamd_re_cache_load_hyperscan(struct rspamd_re_cache *cache,
							   const char *cache_dir, bool try_load)
{
	g_assert(cache != NULL);
	g_assert(cache_dir != NULL);

#ifndef WITH_HYPERSCAN
	return RSPAMD_HYPERSCAN_UNSUPPORTED;
#else
	char path[PATH_MAX];
	int fd, i, n, *hs_ids = NULL, *hs_flags = NULL, total = 0, ret;
	GHashTableIter it;
	gpointer k, v;
	uint8_t *map, *p;
	struct rspamd_re_class *re_class;
	struct rspamd_re_cache_elt *elt;
	struct stat st;
	gboolean has_valid = FALSE, all_valid = FALSE;

	g_hash_table_iter_init(&it, cache->re_classes);

	while (g_hash_table_iter_next(&it, &k, &v)) {
		re_class = v;
		rspamd_snprintf(path, sizeof(path), "%s%c%s.hs", cache_dir,
						G_DIR_SEPARATOR, re_class->hash);

		if (rspamd_re_cache_is_valid_hyperscan_file(cache, path, try_load, FALSE, NULL)) {
			msg_debug_re_cache("load hyperscan database from '%s'",
							   re_class->hash);

			fd = open(path, O_RDONLY);

			/* Read number of regexps */
			g_assert(fd != -1);
			fstat(fd, &st);

			map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);

			if (map == MAP_FAILED) {
				if (!try_load) {
					msg_err_re_cache("cannot mmap %s: %s", path, strerror(errno));
				}
				else {
					msg_debug_re_cache("cannot mmap %s: %s", path, strerror(errno));
				}

				close(fd);
				all_valid = FALSE;
				continue;
			}

			close(fd);
			p = map + RSPAMD_HS_MAGIC_LEN + sizeof(cache->plt);
			n = *(int *) p;

			if (n <= 0 || 2 * n * sizeof(int) +         /* IDs + flags */
								  sizeof(uint64_t) +    /* crc */
								  RSPAMD_HS_MAGIC_LEN + /* header */
								  sizeof(cache->plt) >
							  (gsize) st.st_size) {
				/* Some wrong amount of regexps */
				if (!try_load) {
					msg_err_re_cache("bad number of expressions in %s: %d",
									 path, n);
				}
				else {
					msg_debug_re_cache("bad number of expressions in %s: %d",
									   path, n);
				}

				munmap(map, st.st_size);
				all_valid = FALSE;
				continue;
			}

			total += n;
			p += sizeof(n);
			hs_ids = g_malloc(n * sizeof(*hs_ids));
			memcpy(hs_ids, p, n * sizeof(*hs_ids));
			p += n * sizeof(*hs_ids);
			hs_flags = g_malloc(n * sizeof(*hs_flags));
			memcpy(hs_flags, p, n * sizeof(*hs_flags));

			/* Skip crc */
			p += n * sizeof(*hs_ids) + sizeof(uint64_t);

			/* Cleanup */
			if (re_class->hs_scratch != NULL) {
				hs_free_scratch(re_class->hs_scratch);
			}

			if (re_class->hs_db != NULL) {
				rspamd_hyperscan_free(re_class->hs_db, false);
			}

			if (re_class->hs_ids) {
				g_free(re_class->hs_ids);
			}

			re_class->hs_ids = NULL;
			re_class->hs_scratch = NULL;
			re_class->hs_db = NULL;
			munmap(map, st.st_size);

			re_class->hs_db = rspamd_hyperscan_maybe_load(path, p - map);
			if (re_class->hs_db == NULL) {
				if (!try_load) {
					msg_err_re_cache("bad hs database in %s", path);
				}
				else {
					msg_debug_re_cache("bad hs database in %s", path);
				}
				g_free(hs_ids);
				g_free(hs_flags);

				re_class->hs_ids = NULL;
				re_class->hs_scratch = NULL;
				re_class->hs_db = NULL;
				all_valid = FALSE;

				continue;
			}

			if ((ret = hs_alloc_scratch(rspamd_hyperscan_get_database(re_class->hs_db),
										&re_class->hs_scratch)) != HS_SUCCESS) {
				if (!try_load) {
					msg_err_re_cache("bad hs database in %s; error code: %d", path, ret);
				}
				else {
					msg_debug_re_cache("bad hs database in %s; error code: %d", path, ret);
				}
				g_free(hs_ids);
				g_free(hs_flags);

				rspamd_hyperscan_free(re_class->hs_db, true);
				re_class->hs_ids = NULL;
				re_class->hs_scratch = NULL;
				re_class->hs_db = NULL;
				all_valid = FALSE;

				continue;
			}

			/*
			 * Now find hyperscan elts that are successfully compiled and
			 * specify that they should be matched using hyperscan
			 */
			for (i = 0; i < n; i++) {
				g_assert((int) cache->re->len > hs_ids[i] && hs_ids[i] >= 0);
				elt = g_ptr_array_index(cache->re, hs_ids[i]);

				if (hs_flags[i] & HS_FLAG_PREFILTER) {
					elt->match_type = RSPAMD_RE_CACHE_HYPERSCAN_PRE;
				}
				else {
					elt->match_type = RSPAMD_RE_CACHE_HYPERSCAN;
				}
			}

			re_class->hs_ids = hs_ids;
			g_free(hs_flags);
			re_class->nhs = n;

			if (!has_valid) {
				has_valid = TRUE;
				all_valid = TRUE;
			}
		}
		else {
			if (!try_load) {
				msg_err_re_cache("invalid hyperscan hash file '%s'",
								 path);
			}
			else {
				msg_debug_re_cache("invalid hyperscan hash file '%s'",
								   path);
			}
			all_valid = FALSE;
			continue;
		}
	}

	if (has_valid) {
		if (all_valid) {
			msg_info_re_cache("full hyperscan database of %d regexps has been loaded", total);
			cache->hyperscan_loaded = RSPAMD_HYPERSCAN_LOADED_FULL;
		}
		else {
			msg_info_re_cache("partial hyperscan database of %d regexps has been loaded", total);
			cache->hyperscan_loaded = RSPAMD_HYPERSCAN_LOADED_PARTIAL;
		}
	}
	else {
		msg_info_re_cache("hyperscan database has NOT been loaded; no valid expressions");
		cache->hyperscan_loaded = RSPAMD_HYPERSCAN_LOAD_ERROR;
	}


	return cache->hyperscan_loaded;
#endif
}

void rspamd_re_cache_add_selector(struct rspamd_re_cache *cache,
								  const char *sname,
								  int ref)
{
	khiter_t k;

	k = kh_get(lua_selectors_hash, cache->selectors, (char *) sname);

	if (k == kh_end(cache->selectors)) {
		char *cpy = g_strdup(sname);
		int res;

		k = kh_put(lua_selectors_hash, cache->selectors, cpy, &res);

		kh_value(cache->selectors, k) = ref;
	}
	else {
		msg_warn_re_cache("replacing selector with name %s", sname);

		if (cache->L) {
			luaL_unref(cache->L, LUA_REGISTRYINDEX, kh_value(cache->selectors, k));
		}

		kh_value(cache->selectors, k) = ref;
	}
}