/*-
 * Copyright 2016 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.
 */
/*
 * Rspamd fuzzy storage server
 */

#include <libserver/rspamd_control.h>
#include <src/libutil/map_private.h>
#include "config.h"
#include "util.h"
#include "rspamd.h"
#include "map.h"
#include "fuzzy_wire.h"
#include "fuzzy_backend.h"
#include "ottery.h"
#include "libserver/worker_util.h"
#include "libserver/rspamd_control.h"
#include "libcryptobox/cryptobox.h"
#include "libcryptobox/keypairs_cache.h"
#include "libcryptobox/keypair.h"
#include "ref.h"
#include "xxhash.h"
#include "libutil/hash.h"
#include "libutil/http_private.h"
#include "unix-std.h"

/* Resync value in seconds */
#define DEFAULT_SYNC_TIMEOUT 60.0
#define DEFAULT_KEYPAIR_CACHE_SIZE 512
#define DEFAULT_MASTER_TIMEOUT 10.0
#define DEFAULT_UPDATES_MAXFAIL 3
#define COOKIE_SIZE 128

static const gchar *local_db_name = "local";

#define msg_err_fuzzy_update(...) rspamd_default_log_function (G_LOG_LEVEL_CRITICAL, \
        session->name, session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)
#define msg_warn_fuzzy_update(...)   rspamd_default_log_function (G_LOG_LEVEL_WARNING, \
        session->name, session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)
#define msg_info_fuzzy_update(...)   rspamd_default_log_function (G_LOG_LEVEL_INFO, \
        session->name, session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)
#define msg_err_fuzzy_collection(...) rspamd_default_log_function (G_LOG_LEVEL_CRITICAL, \
        "fuzzy_collection", session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)
#define msg_warn_fuzzy_collection(...)   rspamd_default_log_function (G_LOG_LEVEL_WARNING, \
       "fuzzy_collection", session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)
#define msg_info_fuzzy_collection(...)   rspamd_default_log_function (G_LOG_LEVEL_INFO, \
       "fuzzy_collection", session->uid, \
        G_STRFUNC, \
        __VA_ARGS__)

/* Init functions */
gpointer init_fuzzy (struct rspamd_config *cfg);
void start_fuzzy (struct rspamd_worker *worker);

worker_t fuzzy_worker = {
		"fuzzy",                    /* Name */
		init_fuzzy,                 /* Init function */
		start_fuzzy,                /* Start function */
		RSPAMD_WORKER_HAS_SOCKET,
		RSPAMD_WORKER_SOCKET_UDP|RSPAMD_WORKER_SOCKET_TCP,   /* Both socket */
		RSPAMD_WORKER_VER           /* Version info */
};

struct fuzzy_global_stat {
	guint64 fuzzy_hashes;
	/**< number of fuzzy hashes stored					*/
	guint64 fuzzy_hashes_expired;
	/**< number of fuzzy hashes expired					*/
	guint64 fuzzy_hashes_checked[RSPAMD_FUZZY_EPOCH_MAX];
	/**< amount of check requests for each epoch		*/
	guint64 fuzzy_shingles_checked[RSPAMD_FUZZY_EPOCH_MAX];
	/**< amount of shingle check requests for each epoch	*/
	guint64 fuzzy_hashes_found[RSPAMD_FUZZY_EPOCH_MAX];
	/**< amount of hashes found by epoch				*/
	guint64 invalid_requests;
};

struct fuzzy_key_stat {
	guint64 checked;
	guint64 matched;
	guint64 added;
	guint64 deleted;
	guint64 errors;
	rspamd_lru_hash_t *last_ips;
};

struct rspamd_fuzzy_mirror {
	gchar *name;
	struct upstream_list *u;
	struct rspamd_cryptobox_pubkey *key;
};

static const guint64 rspamd_fuzzy_storage_magic = 0x291a3253eb1b3ea5ULL;

struct rspamd_fuzzy_storage_ctx {
	guint64 magic;
	/* Events base */
	struct event_base *ev_base;
	/* DNS resolver */
	struct rspamd_dns_resolver *resolver;
	/* Config */
	struct rspamd_config *cfg;
	/* END OF COMMON PART */
	struct fuzzy_global_stat stat;
	char *hashfile;
	gdouble expire;
	gdouble sync_timeout;
	radix_compressed_t *update_ips;
	radix_compressed_t *master_ips;
	struct rspamd_cryptobox_keypair *sync_keypair;
	struct rspamd_cryptobox_pubkey *master_key;
	struct timeval master_io_tv;
	gdouble master_timeout;
	GPtrArray *mirrors;
	const ucl_object_t *update_map;
	const ucl_object_t *masters_map;
	GHashTable *master_flags;
	guint keypair_cache_size;
	gint peer_fd;
	struct event peer_ev;
	struct event stat_ev;
	struct timeval stat_tv;
	/* Local keypair */
	struct rspamd_cryptobox_keypair *default_keypair; /* Bad clash, need for parse keypair */
	struct fuzzy_key *default_key;
	GHashTable *keys;
	gboolean encrypted_only;
	gboolean collection_mode;
	struct rspamd_cryptobox_keypair *collection_keypair;
	struct rspamd_cryptobox_pubkey *collection_sign_key;
	gchar *collection_id_file;
	struct rspamd_keypair_cache *keypair_cache;
	rspamd_lru_hash_t *errors_ips;
	struct rspamd_fuzzy_backend *backend;
	GArray *updates_pending;
	guint updates_failed;
	guint updates_maxfail;
	guint32 collection_id;
	struct rspamd_worker *worker;
	struct rspamd_http_connection_router *collection_rt;
	const ucl_object_t *skip_map;
	GHashTable *skip_hashes;
	guchar cookie[COOKIE_SIZE];
};

enum fuzzy_cmd_type {
	CMD_NORMAL,
	CMD_SHINGLE,
	CMD_ENCRYPTED_NORMAL,
	CMD_ENCRYPTED_SHINGLE
};

struct fuzzy_session {
	struct rspamd_worker *worker;
	rspamd_inet_addr_t *addr;
	struct rspamd_fuzzy_storage_ctx *ctx;

	union {
		struct rspamd_fuzzy_encrypted_shingle_cmd enc_shingle;
		struct rspamd_fuzzy_encrypted_cmd enc_normal;
		struct rspamd_fuzzy_cmd normal;
		struct rspamd_fuzzy_shingle_cmd shingle;
	} cmd;

	struct rspamd_fuzzy_encrypted_reply reply;
	struct fuzzy_key_stat *ip_stat;

	enum rspamd_fuzzy_epoch epoch;
	enum fuzzy_cmd_type cmd_type;
	gint fd;
	guint64 time;
	struct event io;
	ref_entry_t ref;
	struct fuzzy_key_stat *key_stat;
	guchar nm[rspamd_cryptobox_MAX_NMBYTES];
};

struct fuzzy_peer_request {
	struct event io_ev;
	struct fuzzy_peer_cmd cmd;
};

struct fuzzy_key {
	struct rspamd_cryptobox_keypair *key;
	struct rspamd_cryptobox_pubkey *pk;
	struct fuzzy_key_stat *stat;
};

struct fuzzy_master_update_session {
	const gchar *name;
	gchar uid[16];
	struct rspamd_http_connection *conn;
	struct rspamd_http_message *msg;
	struct rspamd_fuzzy_storage_ctx *ctx;
	const gchar *src;
	gchar *psrc;
	rspamd_inet_addr_t *addr;
	gboolean replied;
	gint sock;
};

static void rspamd_fuzzy_write_reply (struct fuzzy_session *session);

static gboolean
rspamd_fuzzy_check_client (struct fuzzy_session *session)
{
	if (session->ctx->update_ips != NULL) {
		if (radix_find_compressed_addr (session->ctx->update_ips,
				session->addr) == RADIX_NO_VALUE) {
			return FALSE;
		}
		else {
			return TRUE;
		}
	}

	return FALSE;
}

static void
fuzzy_key_stat_dtor (gpointer p)
{
	struct fuzzy_key_stat *st = p;

	if (st->last_ips) {
		rspamd_lru_hash_destroy (st->last_ips);
	}
}

static void
fuzzy_key_dtor (gpointer p)
{
	struct fuzzy_key *key = p;

	if (key->stat) {
		fuzzy_key_stat_dtor (key->stat);
	}
}

static void
fuzzy_count_callback (guint64 count, void *ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;

	ctx->stat.fuzzy_hashes = count;
}

struct fuzzy_slave_connection {
	struct rspamd_cryptobox_keypair *local_key;
	struct rspamd_cryptobox_pubkey *remote_key;
	struct upstream *up;
	struct rspamd_http_connection *http_conn;
	struct rspamd_fuzzy_mirror *mirror;
	gint sock;
};

static void
fuzzy_mirror_close_connection (struct fuzzy_slave_connection *conn)
{
	if (conn) {
		if (conn->http_conn) {
			rspamd_http_connection_reset (conn->http_conn);
			rspamd_http_connection_unref (conn->http_conn);
		}

		close (conn->sock);

		g_free (conn);
	}
}

struct rspamd_fuzzy_updates_cbdata {
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct rspamd_http_message *msg;
	struct fuzzy_slave_connection *conn;
	struct rspamd_fuzzy_mirror *m;
};

static void
fuzzy_mirror_updates_version_cb (guint64 rev64, void *ud)
{
	struct rspamd_fuzzy_updates_cbdata *cbdata = ud;
	struct fuzzy_peer_cmd *io_cmd;
	guint32 rev32 = rev64, len;
	const gchar *p;
	rspamd_fstring_t *reply;
	struct fuzzy_slave_connection *conn;
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct rspamd_http_message *msg;
	struct rspamd_fuzzy_mirror *m;
	struct timeval tv;
	guint i;

	conn = cbdata->conn;
	ctx = cbdata->ctx;
	msg = cbdata->msg;
	m = cbdata->m;
	g_free (cbdata);
	rev32 = GUINT32_TO_LE (rev32);
	len = sizeof (guint32) * 2; /* revision + last chunk */

	for (i = 0; i < ctx->updates_pending->len; i ++) {
		io_cmd = &g_array_index (ctx->updates_pending, struct fuzzy_peer_cmd, i);

		if (io_cmd->is_shingle) {
			len += sizeof (guint32) + sizeof (guint32) +
					sizeof (struct rspamd_fuzzy_shingle_cmd);
		}
		else {
			len += sizeof (guint32) + sizeof (guint32) +
					sizeof (struct rspamd_fuzzy_cmd);
		}
	}

	reply = rspamd_fstring_sized_new (len);
	reply = rspamd_fstring_append (reply, (const char *)&rev32,
			sizeof (rev32));

	for (i = 0; i < ctx->updates_pending->len; i ++) {
		io_cmd = &g_array_index (ctx->updates_pending, struct fuzzy_peer_cmd, i);

		if (io_cmd->is_shingle) {
			len = sizeof (guint32) +
					sizeof (struct rspamd_fuzzy_shingle_cmd);
		}
		else {
			len = sizeof (guint32) +
					sizeof (struct rspamd_fuzzy_cmd);
		}

		p = (const char *)io_cmd;
		len = GUINT32_TO_LE (len);
		reply = rspamd_fstring_append (reply, (const char *)&len, sizeof (len));
		reply = rspamd_fstring_append (reply, p, len);
	}

	/* Last chunk */
	len = 0;
	reply = rspamd_fstring_append (reply, (const char *)&len, sizeof (len));
	rspamd_http_message_set_body_from_fstring_steal (msg, reply);
	double_to_tv (ctx->sync_timeout, &tv);
	rspamd_http_connection_write_message (conn->http_conn,
			msg, NULL, NULL, conn,
			conn->sock,
			&tv, ctx->ev_base);
	msg_info ("send update request to %s", m->name);
}

static void
fuzzy_mirror_updates_to_http (struct rspamd_fuzzy_mirror *m,
		struct fuzzy_slave_connection *conn,
		struct rspamd_fuzzy_storage_ctx *ctx,
		struct rspamd_http_message *msg)
{

	struct rspamd_fuzzy_updates_cbdata *cbdata;

	cbdata = g_malloc (sizeof (*cbdata));
	cbdata->ctx = ctx;
	cbdata->msg = msg;
	cbdata->conn = conn;
	cbdata->m = m;
	rspamd_fuzzy_backend_version (ctx->backend, local_db_name,
			fuzzy_mirror_updates_version_cb, cbdata);
}

static void
fuzzy_mirror_error_handler (struct rspamd_http_connection *conn, GError *err)
{
	struct fuzzy_slave_connection *bk_conn = conn->ud;
	msg_info ("abnormally closing connection from backend: %s:%s, "
			"error: %e",
			bk_conn->mirror->name,
			rspamd_inet_address_to_string (rspamd_upstream_addr (bk_conn->up)),
			err);

	fuzzy_mirror_close_connection (bk_conn);
}

static gint
fuzzy_mirror_finish_handler (struct rspamd_http_connection *conn,
	struct rspamd_http_message *msg)
{
	struct fuzzy_slave_connection *bk_conn = conn->ud;

	msg_info ("finished mirror connection to %s", bk_conn->mirror->name);
	fuzzy_mirror_close_connection (bk_conn);

	return 0;
}

static void
rspamd_fuzzy_send_update_mirror (struct rspamd_fuzzy_storage_ctx *ctx,
		struct rspamd_fuzzy_mirror *m)
{
	struct fuzzy_slave_connection *conn;
	struct rspamd_http_message *msg;

	conn = g_malloc0 (sizeof (*conn));
	conn->up = rspamd_upstream_get (m->u,
			RSPAMD_UPSTREAM_MASTER_SLAVE, NULL, 0);
	conn->mirror = m;

	if (conn->up == NULL) {
		msg_err ("cannot select upstream for %s", m->name);
		return;
	}

	conn->sock = rspamd_inet_address_connect (
			rspamd_upstream_addr (conn->up),
			SOCK_STREAM, TRUE);

	if (conn->sock == -1) {
		msg_err ("cannot connect upstream for %s", m->name);
		rspamd_upstream_fail (conn->up);
		return;
	}

	msg = rspamd_http_new_message (HTTP_REQUEST);
	rspamd_printf_fstring (&msg->url, "/update_v1/%s", m->name);

	conn->http_conn = rspamd_http_connection_new (NULL,
			fuzzy_mirror_error_handler,
			fuzzy_mirror_finish_handler,
			RSPAMD_HTTP_CLIENT_SIMPLE,
			RSPAMD_HTTP_CLIENT,
			ctx->keypair_cache,
			NULL);

	rspamd_http_connection_set_key (conn->http_conn,
			ctx->sync_keypair);
	msg->peer_key = rspamd_pubkey_ref (m->key);
	fuzzy_mirror_updates_to_http (m, conn, ctx, msg);
}

struct rspamd_updates_cbdata {
	struct rspamd_fuzzy_storage_ctx *ctx;
	gchar *source;
};

static void
fuzzy_update_version_callback (guint64 ver, void *ud)
{
	msg_info ("updated fuzzy storage from %s: version: %d",
		(const char *)ud, (gint)ver);
	g_free (ud);
}

static void
fuzzy_stat_count_callback (guint64 count, void *ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;

	event_add (&ctx->stat_ev, &ctx->stat_tv);
	ctx->stat.fuzzy_hashes = count;
}

static void
rspamd_fuzzy_stat_callback (gint fd, gshort what, gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;

	event_del (&ctx->stat_ev);
	rspamd_fuzzy_backend_count (ctx->backend, fuzzy_stat_count_callback, ctx);
}

static void
rspamd_fuzzy_updates_cb (gboolean success, void *ud)
{
	struct rspamd_updates_cbdata *cbdata = ud;
	struct rspamd_fuzzy_mirror *m;
	guint i;
	struct rspamd_fuzzy_storage_ctx *ctx;
	const gchar *source;

	ctx = cbdata->ctx;
	source = cbdata->source;

	if (success) {
		rspamd_fuzzy_backend_count (ctx->backend, fuzzy_count_callback, ctx);

		if (ctx->updates_pending->len > 0) {
			for (i = 0; i < ctx->mirrors->len; i ++) {
				m = g_ptr_array_index (ctx->mirrors, i);

				rspamd_fuzzy_send_update_mirror (ctx, m);
			}
		}

		/* Clear updates */
		ctx->updates_pending->len = 0;
		rspamd_fuzzy_backend_version (ctx->backend, source,
				fuzzy_update_version_callback, g_strdup (source));
		ctx->updates_failed = 0;
	}
	else {
		if (++ctx->updates_failed > ctx->updates_maxfail) {
			msg_err ("cannot commit update transaction to fuzzy backend, discard "
					"%ud updates after %d retries",
					ctx->updates_pending->len,
					ctx->updates_maxfail);
			ctx->updates_failed = 0;
			ctx->updates_pending->len = 0;
		}
		else {
			msg_err ("cannot commit update transaction to fuzzy backend, "
					"%ud updates are still pending, %d updates left",
					ctx->updates_pending->len,
					ctx->updates_maxfail - ctx->updates_failed);
		}
	}

	if (ctx->worker->wanna_die) {
		/* Plan exit */
		struct timeval tv;

		tv.tv_sec = 0;
		tv.tv_usec = 0;

		event_base_loopexit (ctx->ev_base, &tv);
	}

	g_free (cbdata->source);
	g_free (cbdata);
}

static void
rspamd_fuzzy_process_updates_queue (struct rspamd_fuzzy_storage_ctx *ctx,
		const gchar *source, gboolean forced)
{

	struct rspamd_updates_cbdata *cbdata;

	if ((forced ||ctx->updates_pending->len > 0)) {
		cbdata = g_malloc (sizeof (*cbdata));
		cbdata->ctx = ctx;
		cbdata->source = g_strdup (source);
		rspamd_fuzzy_backend_process_updates (ctx->backend, ctx->updates_pending,
				source, rspamd_fuzzy_updates_cb, cbdata);
	}
}

static void
rspamd_fuzzy_reply_io (gint fd, gshort what, gpointer d)
{
	struct fuzzy_session *session = d;

	rspamd_fuzzy_write_reply (session);
	REF_RELEASE (session);
}

static void
rspamd_fuzzy_write_reply (struct fuzzy_session *session)
{
	gssize r;
	gsize len;
	gconstpointer data;

	if (session->cmd_type == CMD_ENCRYPTED_NORMAL ||
				session->cmd_type == CMD_ENCRYPTED_SHINGLE) {
		/* Encrypted reply */
		data = &session->reply;

		if (session->epoch > RSPAMD_FUZZY_EPOCH10) {
			len = sizeof (session->reply);
		}
		else {
			len = sizeof (session->reply.hdr) + sizeof (session->reply.rep.v1);
		}
	}
	else {
		data = &session->reply.rep;

		if (session->epoch > RSPAMD_FUZZY_EPOCH10) {
			len = sizeof (session->reply.rep);
		}
		else {
			len = sizeof (session->reply.rep.v1);
		}
	}

	r = rspamd_inet_address_sendto (session->fd, data, len, 0,
			session->addr);

	if (r == -1) {
		if (errno == EINTR || errno == EWOULDBLOCK || errno == EAGAIN) {
			/* Grab reference to avoid early destruction */
			REF_RETAIN (session);
			event_set (&session->io, session->fd, EV_WRITE,
					rspamd_fuzzy_reply_io, session);
			event_base_set (session->ctx->ev_base, &session->io);
			event_add (&session->io, NULL);
		}
		else {
			msg_err ("error while writing reply: %s", strerror (errno));
		}
	}
}

static void
fuzzy_peer_send_io (gint fd, gshort what, gpointer d)
{
	struct fuzzy_peer_request *up_req = d;
	gssize r;

	r = write (fd, &up_req->cmd, sizeof (up_req->cmd));

	if (r != sizeof (up_req->cmd)) {
		msg_err ("cannot send update request to the peer: %s", strerror (errno));
	}

	event_del (&up_req->io_ev);
	g_free (up_req);
}

static void
rspamd_fuzzy_update_stats (struct rspamd_fuzzy_storage_ctx *ctx,
		enum rspamd_fuzzy_epoch epoch,
		gboolean matched,
		gboolean is_shingle,
		struct fuzzy_key_stat *key_stat,
		struct fuzzy_key_stat *ip_stat,
		guint cmd, guint reply)
{
	ctx->stat.fuzzy_hashes_checked[epoch] ++;

	if (matched) {
		ctx->stat.fuzzy_hashes_found[epoch]++;
	}
	if (is_shingle) {
		ctx->stat.fuzzy_shingles_checked[epoch]++;
	}

	if (key_stat) {
		if (!matched && reply != 0) {
			key_stat->errors ++;
		}
		else {
			if (cmd == FUZZY_CHECK) {
				key_stat->checked++;

				if (matched) {
					key_stat->matched ++;
				}
			}
			else if (cmd == FUZZY_WRITE) {
				key_stat->added++;
			}
			else if (cmd == FUZZY_DEL) {
				key_stat->deleted++;
			}
		}
	}

	if (ip_stat) {
		if (!matched && reply != 0) {
			ip_stat->errors++;
		}
		else {
			if (cmd == FUZZY_CHECK) {
				ip_stat->checked++;

				if (matched) {
					ip_stat->matched++;
				}
			}
			else if (cmd == FUZZY_WRITE) {
				ip_stat->added++;
			}
			else if (cmd == FUZZY_DEL) {
				ip_stat->deleted++;
			}
		}
	}
}

static void
rspamd_fuzzy_make_reply (struct rspamd_fuzzy_cmd *cmd,
		struct rspamd_fuzzy_reply *result,
		struct fuzzy_session *session,
		gboolean encrypted, gboolean is_shingle)
{
	gsize len;

	if (cmd) {
		result->v1.tag = cmd->tag;
		memcpy (&session->reply.rep, result, sizeof (*result));

		rspamd_fuzzy_update_stats (session->ctx,
				session->epoch,
				result->v1.prob > 0.5,
				is_shingle,
				session->key_stat,
				session->ip_stat,
				cmd->cmd,
				result->v1.value);

		if (encrypted) {
			/* We need also to encrypt reply */
			ottery_rand_bytes (session->reply.hdr.nonce,
					sizeof (session->reply.hdr.nonce));

			/*
			 * For old replies we need to encrypt just old part, otherwise
			 * decryption would fail due to mac verification mistake
			 */

			if (session->epoch > RSPAMD_FUZZY_EPOCH10) {
				len = sizeof (session->reply.rep);
			}
			else {
				len = sizeof (session->reply.rep.v1);
			}

			rspamd_cryptobox_encrypt_nm_inplace ((guchar *)&session->reply.rep,
					len,
					session->reply.hdr.nonce,
					session->nm,
					session->reply.hdr.mac,
					RSPAMD_CRYPTOBOX_MODE_25519);
		}
	}

	rspamd_fuzzy_write_reply (session);
}

static void
rspamd_fuzzy_check_callback (struct rspamd_fuzzy_reply *result, void *ud)
{
	struct fuzzy_session *session = ud;
	gboolean encrypted = FALSE, is_shingle = FALSE;
	struct rspamd_fuzzy_cmd *cmd = NULL;

	switch (session->cmd_type) {
	case CMD_NORMAL:
		cmd = &session->cmd.normal;
		break;
	case CMD_SHINGLE:
		cmd = &session->cmd.shingle.basic;
		is_shingle = TRUE;
		break;
	case CMD_ENCRYPTED_NORMAL:
		cmd = &session->cmd.enc_normal.cmd;
		encrypted = TRUE;
		break;
	case CMD_ENCRYPTED_SHINGLE:
		cmd = &session->cmd.enc_shingle.cmd.basic;
		encrypted = TRUE;
		is_shingle = TRUE;
		break;
	}

	rspamd_fuzzy_make_reply (cmd, result, session, encrypted, is_shingle);
	REF_RELEASE (session);
}

static void
rspamd_fuzzy_process_command (struct fuzzy_session *session)
{
	gboolean encrypted = FALSE, is_shingle = FALSE;
	struct rspamd_fuzzy_cmd *cmd = NULL;
	struct rspamd_fuzzy_reply result;
	struct fuzzy_peer_cmd up_cmd;
	struct fuzzy_peer_request *up_req;
	struct fuzzy_key_stat *ip_stat = NULL;
	gchar hexbuf[rspamd_cryptobox_HASHBYTES * 2 + 1];
	rspamd_inet_addr_t *naddr;
	gpointer ptr;
	gsize up_len = 0;

	switch (session->cmd_type) {
	case CMD_NORMAL:
		cmd = &session->cmd.normal;
		up_len = sizeof (session->cmd.normal);
		break;
	case CMD_SHINGLE:
		cmd = &session->cmd.shingle.basic;
		up_len = sizeof (session->cmd.shingle);
		is_shingle = TRUE;
		break;
	case CMD_ENCRYPTED_NORMAL:
		cmd = &session->cmd.enc_normal.cmd;
		up_len = sizeof (session->cmd.normal);
		encrypted = TRUE;
		break;
	case CMD_ENCRYPTED_SHINGLE:
		cmd = &session->cmd.enc_shingle.cmd.basic;
		up_len = sizeof (session->cmd.shingle);
		encrypted = TRUE;
		is_shingle = TRUE;
		break;
	default:
		msg_err ("invalid command type: %d", session->cmd_type);
		return;
	}

	memset (&result, 0, sizeof (result));
	memcpy (result.digest, cmd->digest, sizeof (result.digest));
	result.v1.flag = cmd->flag;
	result.v1.tag = cmd->tag;

	if (G_UNLIKELY (cmd == NULL || up_len == 0)) {
		result.v1.value = 500;
		result.v1.prob = 0.0;
		rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
		return;
	}

	if (session->ctx->encrypted_only && !encrypted) {
		/* Do not accept unencrypted commands */
		result.v1.value = 403;
		result.v1.prob = 0.0;
		rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
		return;
	}

	if (session->key_stat) {
		ip_stat = rspamd_lru_hash_lookup (session->key_stat->last_ips,
				session->addr, -1);

		if (ip_stat == NULL) {
			naddr = rspamd_inet_address_copy (session->addr);
			ip_stat = g_malloc0 (sizeof (*ip_stat));
			rspamd_lru_hash_insert (session->key_stat->last_ips,
					naddr, ip_stat, -1, 0);
		}

		session->ip_stat = ip_stat;
	}

	if (cmd->cmd == FUZZY_CHECK) {
		if (G_UNLIKELY (session->ctx->collection_mode)) {
			result.v1.prob = 0;
			result.v1.value = 500;
			result.v1.flag = 0;
			rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
		}
		else {
			REF_RETAIN (session);
			rspamd_fuzzy_backend_check (session->ctx->backend, cmd,
					rspamd_fuzzy_check_callback, session);
		}
	}
	else if (cmd->cmd == FUZZY_STAT) {
		if (G_UNLIKELY (session->ctx->collection_mode)) {
			result.v1.prob = 0;
			result.v1.value = 500;
			result.v1.flag = 0;
			rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
		}
		else {
			result.v1.prob = 1.0;
			result.v1.value = 0;
			result.v1.flag = session->ctx->stat.fuzzy_hashes;
			rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
		}
	}
	else {
		if (rspamd_fuzzy_check_client (session)) {
			/* Check whitelist */
			if (session->ctx->skip_hashes && cmd->cmd == FUZZY_WRITE) {
				rspamd_encode_hex_buf (cmd->digest, sizeof (cmd->digest),
					hexbuf, sizeof (hexbuf) - 1);
				hexbuf[sizeof (hexbuf) - 1] = '\0';

				if (g_hash_table_lookup (session->ctx->skip_hashes, hexbuf)) {
					result.v1.value = 401;
					result.v1.prob = 0.0;

					goto reply;
				}
			}

			if (session->worker->index == 0 || session->ctx->peer_fd == -1) {
				/* Just add to the queue */
				up_cmd.is_shingle = is_shingle;
				ptr = is_shingle ?
						(gpointer)&up_cmd.cmd.shingle :
						(gpointer)&up_cmd.cmd.normal;
				memcpy (ptr, cmd, up_len);
				g_array_append_val (session->ctx->updates_pending, up_cmd);
			}
			else {
				/* We need to send request to the peer */
				up_req = g_malloc0 (sizeof (*up_req));
				up_req->cmd.is_shingle = is_shingle;
				ptr = is_shingle ?
						(gpointer)&up_req->cmd.cmd.shingle :
						(gpointer)&up_req->cmd.cmd.normal;
				memcpy (ptr, cmd, up_len);
				event_set (&up_req->io_ev, session->ctx->peer_fd, EV_WRITE,
						fuzzy_peer_send_io, up_req);
				event_base_set (session->ctx->ev_base, &up_req->io_ev);
				event_add (&up_req->io_ev, NULL);
			}

			result.v1.value = 0;
			result.v1.prob = 1.0;
		}
		else {
			result.v1.value = 403;
			result.v1.prob = 0.0;
		}
reply:
		rspamd_fuzzy_make_reply (cmd, &result, session, encrypted, is_shingle);
	}
}


static enum rspamd_fuzzy_epoch
rspamd_fuzzy_command_valid (struct rspamd_fuzzy_cmd *cmd, gint r)
{
	enum rspamd_fuzzy_epoch ret = RSPAMD_FUZZY_EPOCH_MAX;

	switch (cmd->version) {
	case 4:
		if (cmd->shingles_count > 0) {
			if (r == sizeof (struct rspamd_fuzzy_shingle_cmd)) {
				ret = RSPAMD_FUZZY_EPOCH11;
			}
		}
		else {
			if (r == sizeof (*cmd)) {
				ret = RSPAMD_FUZZY_EPOCH11;
			}
		}
		break;
	case 3:
		if (cmd->shingles_count > 0) {
			if (r == sizeof (struct rspamd_fuzzy_shingle_cmd)) {
				ret = RSPAMD_FUZZY_EPOCH10;
			}
		}
		else {
			if (r == sizeof (*cmd)) {
				ret = RSPAMD_FUZZY_EPOCH10;
			}
		}
		break;
	case 2:
		/*
		 * rspamd 0.8 has slightly different tokenizer then it might be not
		 * 100% compatible
		 */
		if (cmd->shingles_count > 0) {
			if (r == sizeof (struct rspamd_fuzzy_shingle_cmd)) {
				ret = RSPAMD_FUZZY_EPOCH8;
			}
		}
		else {
			ret = RSPAMD_FUZZY_EPOCH8;
		}
		break;
	default:
		break;
	}

	return ret;
}

static gboolean
rspamd_fuzzy_decrypt_command (struct fuzzy_session *s)
{
	struct rspamd_fuzzy_encrypted_req_hdr *hdr;
	guchar *payload;
	gsize payload_len;
	struct rspamd_cryptobox_pubkey *rk;
	struct fuzzy_key *key;

	if (s->ctx->default_key == NULL) {
		msg_warn ("received encrypted request when encryption is not enabled");
		return FALSE;
	}

	if (s->cmd_type == CMD_ENCRYPTED_NORMAL) {
		hdr = &s->cmd.enc_normal.hdr;
		payload = (guchar *)&s->cmd.enc_normal.cmd;
		payload_len = sizeof (s->cmd.enc_normal.cmd);
	}
	else {
		hdr = &s->cmd.enc_shingle.hdr;
		payload = (guchar *) &s->cmd.enc_shingle.cmd;
		payload_len = sizeof (s->cmd.enc_shingle.cmd);
	}

	/* Compare magic */
	if (memcmp (hdr->magic, fuzzy_encrypted_magic, sizeof (hdr->magic)) != 0) {
		msg_debug ("invalid magic for the encrypted packet");
		return FALSE;
	}

	/* Try to find the desired key */
	key = g_hash_table_lookup (s->ctx->keys, hdr->key_id);

	if (key == NULL) {
		/* Unknown key, assume default one */
		key = s->ctx->default_key;
	}

	s->key_stat = key->stat;

	/* Now process keypair */
	rk = rspamd_pubkey_from_bin (hdr->pubkey, sizeof (hdr->pubkey),
			RSPAMD_KEYPAIR_KEX, RSPAMD_CRYPTOBOX_MODE_25519);

	if (rk == NULL) {
		msg_err ("bad key");
		return FALSE;
	}

	rspamd_keypair_cache_process (s->ctx->keypair_cache, key->key, rk);

	/* Now decrypt request */
	if (!rspamd_cryptobox_decrypt_nm_inplace (payload, payload_len, hdr->nonce,
			rspamd_pubkey_get_nm (rk),
			hdr->mac, RSPAMD_CRYPTOBOX_MODE_25519)) {
		msg_err ("decryption failed");
		rspamd_pubkey_unref (rk);

		return FALSE;
	}

	memcpy (s->nm, rspamd_pubkey_get_nm (rk), sizeof (s->nm));
	rspamd_pubkey_unref (rk);

	return TRUE;
}

static gboolean
rspamd_fuzzy_cmd_from_wire (guchar *buf, guint buflen, struct fuzzy_session *s)
{
	enum rspamd_fuzzy_epoch epoch;

	/* For now, we assume that recvfrom returns a complete datagramm */
	switch (buflen) {
	case sizeof (struct rspamd_fuzzy_cmd):
		s->cmd_type = CMD_NORMAL;
		memcpy (&s->cmd.normal, buf, sizeof (s->cmd.normal));
		epoch = rspamd_fuzzy_command_valid (&s->cmd.normal, buflen);

		if (epoch == RSPAMD_FUZZY_EPOCH_MAX) {
			msg_debug ("invalid fuzzy command of size %d received", buflen);
			return FALSE;
		}
		s->epoch = epoch;
		break;
	case sizeof (struct rspamd_fuzzy_shingle_cmd):
		s->cmd_type = CMD_SHINGLE;
		memcpy (&s->cmd.shingle, buf, sizeof (s->cmd.shingle));
		epoch = rspamd_fuzzy_command_valid (&s->cmd.shingle.basic, buflen);

		if (epoch == RSPAMD_FUZZY_EPOCH_MAX) {
			msg_debug ("invalid fuzzy command of size %d received", buflen);
			return FALSE;
		}
		s->epoch = epoch;
		break;
	case sizeof (struct rspamd_fuzzy_encrypted_cmd):
		s->cmd_type = CMD_ENCRYPTED_NORMAL;
		memcpy (&s->cmd.enc_normal, buf, sizeof (s->cmd.enc_normal));

		if (!rspamd_fuzzy_decrypt_command (s)) {
			return FALSE;
		}
		epoch = rspamd_fuzzy_command_valid (&s->cmd.enc_normal.cmd,
				sizeof (s->cmd.enc_normal.cmd));

		if (epoch == RSPAMD_FUZZY_EPOCH_MAX) {
			msg_debug ("invalid fuzzy command of size %d received", buflen);
			return FALSE;
		}
		/* Encrypted is epoch 10 at least */
		s->epoch = epoch;
		break;
	case sizeof (struct rspamd_fuzzy_encrypted_shingle_cmd):
		s->cmd_type = CMD_ENCRYPTED_SHINGLE;
		memcpy (&s->cmd.enc_shingle, buf, sizeof (s->cmd.enc_shingle));

		if (!rspamd_fuzzy_decrypt_command (s)) {
			return FALSE;
		}
		epoch = rspamd_fuzzy_command_valid (&s->cmd.enc_shingle.cmd.basic,
				sizeof (s->cmd.enc_shingle.cmd));

		if (epoch == RSPAMD_FUZZY_EPOCH_MAX) {
			msg_debug ("invalid fuzzy command of size %d received", buflen);
			return FALSE;
		}

		s->epoch = epoch;
		break;
	default:
		msg_debug ("invalid fuzzy command of size %d received", buflen);
		return FALSE;
	}

	return TRUE;
}

static void
rspamd_fuzzy_mirror_process_update (struct fuzzy_master_update_session *session,
		struct rspamd_http_message *msg, guint our_rev)
{
	const guchar *p;
	gsize remain;
	gint32 revision;
	guint32 len = 0, cnt = 0;
	struct fuzzy_peer_cmd cmd;
	enum {
		read_len = 0,
		read_data,
		finish_processing
	} state = read_len;

	gpointer flag_ptr;

	/*
	 * Message format:
	 * <uint32_le> - revision
	 * <uint32_le> - size of the next element
	 * <data> - command data
	 * ...
	 * <0> - end of data
	 * ... - ignored
	 */
	p = rspamd_http_message_get_body (msg, &remain);

	if (p && remain >= sizeof (gint32) * 2) {
		memcpy (&revision, p, sizeof (gint32));
		revision = GINT32_TO_LE (revision);

		if (revision <= our_rev) {
			msg_err_fuzzy_update ("remote revision: %d is older than ours: %d, "
					"refusing update",
					revision, our_rev);

			return;
		}
		else if (revision - our_rev > 1) {
			msg_warn_fuzzy_update ("remote revision: %d is newer more than one revision "
					"than ours: %d, cold sync is recommended",
								revision, our_rev);
		}

		remain -= sizeof (gint32);
		p += sizeof (gint32);
	}
	else {
		msg_err_fuzzy_update ("short update message, not processing");
		goto err;
	}

	while (remain > 0) {
		switch (state) {
		case read_len:
			if (remain < sizeof (guint32)) {
				msg_err_fuzzy_update ("short update message while reading "
						"length, not processing");
				goto err;
			}

			memcpy (&len, p, sizeof (guint32));
			len = GUINT32_TO_LE (len);
			remain -= sizeof (guint32);
			p += sizeof (guint32);

			if (len == 0) {
				remain = 0;
				state = finish_processing;
			}
			else {
				state = read_data;
			}
			break;
		case read_data:
			if (remain < len) {
				msg_err_fuzzy_update ("short update message while reading data, "
						"not processing"
						" (%zd is available, %d is required)", remain, len);
				return;
			}

			if (len < sizeof (struct rspamd_fuzzy_cmd) + sizeof (guint32) ||
					len > sizeof (cmd)) {
				/* Bad size command */
				msg_err_fuzzy_update ("incorrect element size: %d, at least "
						"%d expected", len,
						(gint)(sizeof (struct rspamd_fuzzy_cmd) + sizeof (guint32)));
				goto err;
			}

			memcpy (&cmd, p, len);
			if (cmd.is_shingle && len != sizeof (cmd)) {
				/* Short command */
				msg_err_fuzzy_update ("incorrect element size: %d, at least "
						"%d expected", len,
						(gint)(sizeof (cmd)));
				goto err;
			}

			if (cmd.is_shingle) {
				if ((flag_ptr = g_hash_table_lookup (session->ctx->master_flags,
						GUINT_TO_POINTER (cmd.cmd.shingle.basic.flag))) != NULL) {
					cmd.cmd.shingle.basic.flag = GPOINTER_TO_UINT (flag_ptr);
				}
			}
			else {
				if ((flag_ptr = g_hash_table_lookup (session->ctx->master_flags,
						GUINT_TO_POINTER (cmd.cmd.normal.flag))) != NULL) {
					cmd.cmd.normal.flag = GPOINTER_TO_UINT (flag_ptr);
				}
			}

			g_array_append_val (session->ctx->updates_pending, cmd);

			p += len;
			remain -= len;
			len = 0;
			state = read_len;
			cnt ++;
			break;
		case finish_processing:
			/* Do nothing */
			remain = 0;
			break;
		}
	}


	rspamd_fuzzy_process_updates_queue (session->ctx, session->src, TRUE);
	msg_info_fuzzy_update ("processed updates from the master %s, "
			"%ud operations processed,"
			" revision: %d (local revision: %d)",
			rspamd_inet_address_to_string (session->addr),
			cnt, revision, our_rev);

err:
	return;
}


static void
fuzzy_session_destroy (gpointer d)
{
	struct fuzzy_session *session = d;

	rspamd_inet_address_free (session->addr);
	rspamd_explicit_memzero (session->nm, sizeof (session->nm));
	session->worker->nconns--;
	g_free (session);
}

static void
rspamd_fuzzy_mirror_session_destroy (struct fuzzy_master_update_session *session)
{
	if (session) {
		rspamd_http_connection_reset (session->conn);
		rspamd_http_connection_unref (session->conn);
		rspamd_inet_address_free (session->addr);
		close (session->sock);

		if (session->psrc) {
			g_free (session->psrc);
		}
		g_free (session);
	}
}

static void
rspamd_fuzzy_mirror_error_handler (struct rspamd_http_connection *conn, GError *err)
{
	struct fuzzy_master_update_session *session = conn->ud;

	msg_err_fuzzy_update ("abnormally closing connection from: %s, error: %e",
		rspamd_inet_address_to_string (session->addr), err);
	/* Terminate session immediately */
	rspamd_fuzzy_mirror_session_destroy (session);
}

static void
rspamd_fuzzy_mirror_send_reply (struct fuzzy_master_update_session *session,
		guint code, const gchar *str)
{
	struct rspamd_http_message *msg;

	msg = rspamd_http_new_message (HTTP_RESPONSE);
	msg->url = rspamd_fstring_new_init (str, strlen (str));
	msg->code = code;
	session->replied = TRUE;

	rspamd_http_connection_reset (session->conn);
	rspamd_http_connection_write_message (session->conn, msg, NULL, "text/plain",
			session, session->sock, &session->ctx->master_io_tv,
			session->ctx->ev_base);
}

static void
rspamd_fuzzy_update_version_callback (guint64 version, void *ud)
{
	struct fuzzy_master_update_session *session = ud;

	rspamd_fuzzy_mirror_process_update (session, session->msg, version);
	rspamd_fuzzy_mirror_send_reply (session, 200, "OK");
}

static gint
rspamd_fuzzy_mirror_finish_handler (struct rspamd_http_connection *conn,
	struct rspamd_http_message *msg)
{
	struct fuzzy_master_update_session *session = conn->ud;
	const struct rspamd_cryptobox_pubkey *rk;
	const gchar *err_str = NULL;
	gchar *psrc;
	const gchar *src = NULL;
	gsize remain;

	if (session->replied) {
		rspamd_fuzzy_mirror_session_destroy (session);

		return 0;
	}

	/* Check key */
	if (!rspamd_http_connection_is_encrypted (conn)) {
		msg_err_fuzzy_update ("refuse unencrypted update from: %s",
				rspamd_inet_address_to_string (session->addr));
		err_str = "Unencrypted update is not allowed";
		goto end;
	}
	else {

		if (session->ctx->master_key) {
			rk = rspamd_http_connection_get_peer_key (conn);
			g_assert (rk != NULL);

			if (!rspamd_pubkey_equal (rk, session->ctx->master_key)) {
				msg_err_fuzzy_update ("refuse unknown pubkey update from: %s",
						rspamd_inet_address_to_string (session->addr));
				err_str = "Unknown pubkey";
				goto end;
			}
		}
		else {
			msg_warn_fuzzy_update ("no trusted key specified, accept any update from %s",
					rspamd_inet_address_to_string (session->addr));
		}
		if (!rspamd_http_message_get_body (msg, NULL) || !msg->url
				|| msg->url->len == 0) {
			msg_err_fuzzy_update ("empty update message, not processing");
			err_str = "Empty update";

			goto end;
		}

		/* Detect source from url: /update_v1/<source>, so we look for the last '/' */
		remain = msg->url->len;
		psrc = rspamd_fstringdup (msg->url);
		src = psrc;

		while (remain--) {
			if (src[remain] == '/') {
				src = &src[remain + 1];
				break;
			}
		}

		session->src = src;
		session->psrc = psrc;
		session->msg = msg;
		rspamd_fuzzy_backend_version (session->ctx->backend, src,
				rspamd_fuzzy_update_version_callback, session);

		return 0;
	}

end:
	rspamd_fuzzy_mirror_send_reply (session, 403, err_str);

	return 0;
}

struct rspamd_fuzzy_collection_session {
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct rspamd_worker *worker;
	rspamd_inet_addr_t *from_addr;
	guchar uid[16];
};

static void
rspamd_fuzzy_collection_error_handler (struct rspamd_http_connection_entry *conn_ent,
	GError *err)
{
	struct rspamd_fuzzy_collection_session *session = conn_ent->ud;

	msg_err_fuzzy_collection ("http error occurred: %s", err->message);
}

static void
rspamd_fuzzy_collection_finish_handler (struct rspamd_http_connection_entry *conn_ent)
{
	struct rspamd_fuzzy_collection_session *session = conn_ent->ud;


	rspamd_inet_address_free (session->from_addr);
	g_free (session);
}

void
rspamd_fuzzy_collection_send_error (struct rspamd_http_connection_entry *entry,
	gint code, const gchar *error_msg, ...)
{
	struct rspamd_http_message *msg;
	va_list args;
	rspamd_fstring_t *reply;

	msg = rspamd_http_new_message (HTTP_RESPONSE);

	va_start (args, error_msg);
	msg->status = rspamd_fstring_new ();
	rspamd_vprintf_fstring (&msg->status, error_msg, args);
	va_end (args);

	msg->date = time (NULL);
	msg->code = code;
	reply = rspamd_fstring_sized_new (msg->status->len + 16);
	rspamd_printf_fstring (&reply, "%V", msg->status);
	rspamd_http_message_set_body_from_fstring_steal (msg, reply);
	rspamd_http_connection_reset (entry->conn);
	rspamd_http_router_insert_headers (entry->rt, msg);
	rspamd_http_connection_write_message (entry->conn,
		msg,
		NULL,
		"text/plain",
		entry,
		entry->conn->fd,
		entry->rt->ptv,
		entry->rt->ev_base);
	entry->is_reply = TRUE;
}

/*
 * Note: this function steals fstring
 */
void
rspamd_fuzzy_collection_send_fstring (struct rspamd_http_connection_entry *entry,
	rspamd_fstring_t *fstr)
{
	struct rspamd_http_message *msg;

	msg = rspamd_http_new_message (HTTP_RESPONSE);
	msg->status = rspamd_fstring_new_init ("OK", 2);
	msg->date = time (NULL);
	msg->code = 200;
	rspamd_http_message_set_body_from_fstring_steal (msg, fstr);
	rspamd_http_connection_reset (entry->conn);
	rspamd_http_router_insert_headers (entry->rt, msg);
	rspamd_http_connection_write_message (entry->conn,
		msg,
		NULL,
		"application/octet-stream",
		entry,
		entry->conn->fd,
		entry->rt->ptv,
		entry->rt->ev_base);
	entry->is_reply = TRUE;
}

static int
rspamd_fuzzy_collection_cookie (struct rspamd_http_connection_entry *conn_ent,
	struct rspamd_http_message *msg)
{
	struct rspamd_fuzzy_collection_session *session = conn_ent->ud;
	rspamd_fstring_t *cookie;

	cookie = rspamd_fstring_new_init (session->ctx->cookie,
			sizeof (session->ctx->cookie));
	rspamd_fuzzy_collection_send_fstring (conn_ent, cookie);

	return 0;
}

static int
rspamd_fuzzy_collection_data (struct rspamd_http_connection_entry *conn_ent,
	struct rspamd_http_message *msg)
{
	struct rspamd_fuzzy_collection_session *session = conn_ent->ud;
	const rspamd_ftok_t *sign_header;
	struct rspamd_fuzzy_storage_ctx *ctx;
	guint i;
	struct fuzzy_peer_cmd *io_cmd;
	rspamd_fstring_t *reply;
	GError *err = NULL;
	guchar *decoded_signature;
	gsize dec_len;
	guint32 cmdlen, nupdates = 0;

	sign_header = rspamd_http_message_find_header (msg, "Signature");

	if (sign_header == NULL) {
		rspamd_fuzzy_collection_send_error (conn_ent, 403, "Missing signature");

		return 0;
	}

	ctx = session->ctx;

	if (ctx->collection_sign_key == NULL) {
		rspamd_fuzzy_collection_send_error (conn_ent, 500, "Misconfigured signature key");

		return 0;
	}

	decoded_signature = g_malloc (sign_header->len * 2 + 1);
	dec_len = rspamd_decode_hex_buf (sign_header->begin, sign_header->len,
			decoded_signature, sign_header->len * 2 + 1);

	if (dec_len == -1 || !rspamd_keypair_verify (ctx->collection_sign_key,
			ctx->cookie, sizeof (ctx->cookie),
			decoded_signature, dec_len, &err)) {
		if (err) {
			rspamd_fuzzy_collection_send_error (conn_ent, 403, "Signature verification error: %e",
					err);
			g_error_free (err);
		}
		else {
			rspamd_fuzzy_collection_send_error (conn_ent, 403, "Signature verification error");
		}

		g_free (decoded_signature);

		return 0;
	}

	g_free (decoded_signature);

	/* Generate new cookie */
	ottery_rand_bytes (ctx->cookie, sizeof (ctx->cookie));

	/* Send&Clear updates */
	reply = rspamd_fstring_sized_new (8192);
	/*
	 * Message format:
	 * <uint32_le> - revision
	 * <uint32_le> - size of the next element
	 * <data> - command data
	 * ...
	 * <0> - end of data
	 * ... - ignored
	 */
	reply = rspamd_fstring_append (reply, (const gchar *)&ctx->collection_id,
					sizeof (ctx->collection_id));

	for (i = 0; i < ctx->updates_pending->len; i ++) {
		io_cmd = &g_array_index (ctx->updates_pending, struct fuzzy_peer_cmd, i);

		if (io_cmd->is_shingle) {
			cmdlen = sizeof (io_cmd->cmd.shingle) + sizeof (guint32);

		}
		else {
			cmdlen = sizeof (io_cmd->cmd.normal) + sizeof (guint32);
		}

		cmdlen = GUINT32_TO_LE (cmdlen);
		reply = rspamd_fstring_append (reply, (const gchar *)&cmdlen,
				sizeof (cmdlen));
		reply = rspamd_fstring_append (reply, (const gchar *)io_cmd,
				cmdlen);
		nupdates ++;
	}

	msg_info_fuzzy_collection ("collection %d done, send %d updates",
			ctx->collection_id, nupdates);
	/* Last command */
	cmdlen = 0;
	reply = rspamd_fstring_append (reply, (const gchar *)&cmdlen,
			sizeof (cmdlen));

	ctx->updates_pending->len = 0;
	/* Clear failed attempts counter */
	ctx->updates_failed = 0;
	ctx->collection_id ++;
	rspamd_fuzzy_collection_send_fstring (conn_ent, reply);

	return 0;
}


static void
accept_fuzzy_collection_socket (gint fd, short what, void *arg)
{
	struct rspamd_worker *worker = (struct rspamd_worker *)arg;
	rspamd_inet_addr_t *addr;
	gint nfd;
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct rspamd_fuzzy_collection_session *session;

	if ((nfd =
			rspamd_accept_from_socket (fd, &addr, worker->accept_events)) == -1) {
		msg_warn ("accept failed: %s", strerror (errno));
		return;
	}
	/* Check for EAGAIN */
	if (nfd == 0) {
		return;
	}

	ctx = worker->ctx;

	if (!ctx->collection_keypair) {
		msg_err ("deny request from %s, as no local keypair is specified",
				rspamd_inet_address_to_string (addr));
		rspamd_inet_address_free (addr);
		close (nfd);

		return;
	}

	session = g_malloc0 (sizeof (*session));
	session->ctx = ctx;
	session->worker = worker;
	rspamd_random_hex (session->uid, sizeof (session->uid) - 1);
	session->uid[sizeof (session->uid) - 1] = '\0';
	session->from_addr = addr;
	rspamd_http_router_handle_socket (ctx->collection_rt, nfd, session);
	msg_info_fuzzy_collection ("accepted connection from %s port %d, session ptr: %p",
			rspamd_inet_address_to_string (addr),
			rspamd_inet_address_get_port (addr),
			session);
}

static void
rspamd_fuzzy_collection_periodic (gint fd, gshort what, gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;

	if (++ctx->updates_failed > ctx->updates_maxfail) {
		msg_err ("cannot store more data in workqueue, discard "
				"%ud updates after %d missed collection points",
				ctx->updates_pending->len,
				ctx->updates_maxfail);
		ctx->updates_failed = 0;
		ctx->updates_pending->len = 0;
		/* Regenerate cookie */
		ottery_rand_bytes (ctx->cookie, sizeof (ctx->cookie));
	}
	else {
		msg_err ("fuzzy data has not been collected in time, "
				"%ud updates are still pending, %d updates left",
				ctx->updates_pending->len,
				ctx->updates_maxfail - ctx->updates_failed);
	}

	if (ctx->worker->wanna_die) {
		/* Plan exit */
		struct timeval tv;

		tv.tv_sec = 0;
		tv.tv_usec = 0;

		event_base_loopexit (ctx->ev_base, &tv);
	}
}


static void
accept_fuzzy_mirror_socket (gint fd, short what, void *arg)
{
	struct rspamd_worker *worker = (struct rspamd_worker *)arg;
	rspamd_inet_addr_t *addr;
	gint nfd;
	struct rspamd_http_connection *http_conn;
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct fuzzy_master_update_session *session;

	if ((nfd =
			rspamd_accept_from_socket (fd, &addr, worker->accept_events)) == -1) {
		msg_warn ("accept failed: %s", strerror (errno));
		return;
	}
	/* Check for EAGAIN */
	if (nfd == 0) {
		return;
	}

	ctx = worker->ctx;

	if (!ctx->master_ips) {
		msg_err ("deny update request from %s as no masters defined",
				rspamd_inet_address_to_string (addr));
		rspamd_inet_address_free (addr);
		close (nfd);

		return;
	}
	else if (radix_find_compressed_addr (ctx->master_ips, addr) == RADIX_NO_VALUE) {
		msg_err ("deny update request from %s",
				rspamd_inet_address_to_string (addr));
		rspamd_inet_address_free (addr);
		close (nfd);

		return;
	}

	if (!ctx->sync_keypair) {
		msg_err ("deny update request from %s, as no local keypair is specified",
				rspamd_inet_address_to_string (addr));
		rspamd_inet_address_free (addr);
		close (nfd);

		return;
	}

	session = g_malloc0 (sizeof (*session));
	session->name = rspamd_inet_address_to_string (addr);
	rspamd_random_hex (session->uid, sizeof (session->uid) - 1);
	session->uid[sizeof (session->uid) - 1] = '\0';
	http_conn = rspamd_http_connection_new (NULL,
			rspamd_fuzzy_mirror_error_handler,
			rspamd_fuzzy_mirror_finish_handler,
			0,
			RSPAMD_HTTP_SERVER,
			ctx->keypair_cache,
			NULL);

	rspamd_http_connection_set_key (http_conn, ctx->sync_keypair);
	session->ctx = ctx;
	session->conn = http_conn;
	session->addr = addr;
	session->sock = nfd;

	rspamd_http_connection_read_message (http_conn,
			session,
			nfd,
			&ctx->master_io_tv,
			ctx->ev_base);
}

/*
 * Accept new connection and construct task
 */
static void
accept_fuzzy_socket (gint fd, short what, void *arg)
{
	struct rspamd_worker *worker = (struct rspamd_worker *)arg;
	struct fuzzy_session *session;
	rspamd_inet_addr_t *addr;
	gssize r;
	guint8 buf[512];
	guint64 *nerrors;

	/* Got some data */
	if (what == EV_READ) {

		for (;;) {
			worker->nconns++;

			r = rspamd_inet_address_recvfrom (fd,
					buf,
					sizeof (buf),
					0,
					&addr);

			if (r == -1) {
				if (errno == EINTR) {
					continue;
				}
				else if (errno == EAGAIN || errno == EWOULDBLOCK) {

					return;
				}

				msg_err ("got error while reading from socket: %d, %s",
						errno,
						strerror (errno));
				return;
			}

			session = g_malloc0 (sizeof (*session));
			REF_INIT_RETAIN (session, fuzzy_session_destroy);
			session->worker = worker;
			session->fd = fd;
			session->ctx = worker->ctx;
			session->time = (guint64) time (NULL);
			session->addr = addr;

			if (rspamd_fuzzy_cmd_from_wire (buf, r, session)) {
				/* Check shingles count sanity */
				rspamd_fuzzy_process_command (session);
			}
			else {
				/* Discard input */
				session->ctx->stat.invalid_requests ++;
				msg_debug ("invalid fuzzy command of size %z received", r);

				nerrors = rspamd_lru_hash_lookup (session->ctx->errors_ips,
						addr, -1);

				if (nerrors == NULL) {
					nerrors = g_malloc (sizeof (*nerrors));
					*nerrors = 1;
					rspamd_lru_hash_insert (session->ctx->errors_ips,
							rspamd_inet_address_copy (addr),
							nerrors, -1, -1);
				}
				else {
					*nerrors = *nerrors + 1;
				}
			}

			REF_RELEASE (session);
		}
	}
}

static gboolean
rspamd_fuzzy_storage_periodic_callback (void *ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;

	if (ctx->updates_pending->len > 0) {
		rspamd_fuzzy_process_updates_queue (ctx, local_db_name, FALSE);

		return TRUE;
	}

	return FALSE;
}

static gboolean
rspamd_fuzzy_storage_sync (struct rspamd_main *rspamd_main,
		struct rspamd_worker *worker, gint fd,
		gint attached_fd,
		struct rspamd_control_command *cmd,
		gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;
	struct rspamd_control_reply rep;

	rep.reply.fuzzy_sync.status = 0;

	if (ctx->backend && worker->index == 0) {
		rspamd_fuzzy_process_updates_queue (ctx, local_db_name, FALSE);
		rspamd_fuzzy_backend_start_update (ctx->backend, ctx->sync_timeout,
				rspamd_fuzzy_storage_periodic_callback, ctx);
	}

	if (write (fd, &rep, sizeof (rep)) != sizeof (rep)) {
		msg_err ("cannot write reply to the control socket: %s",
				strerror (errno));
	}

	return TRUE;
}

static gboolean
rspamd_fuzzy_storage_reload (struct rspamd_main *rspamd_main,
		struct rspamd_worker *worker, gint fd,
		gint attached_fd,
		struct rspamd_control_command *cmd,
		gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;
	GError *err = NULL;
	struct rspamd_control_reply rep;

	msg_info ("reloading fuzzy storage after receiving reload command");

	if (ctx->backend) {
		/* Close backend and reopen it one more time */
		rspamd_fuzzy_backend_close (ctx->backend);
	}

	memset (&rep, 0, sizeof (rep));
	rep.type = RSPAMD_CONTROL_RELOAD;

	if ((ctx->backend = rspamd_fuzzy_backend_create (ctx->ev_base,
			worker->cf->options, rspamd_main->cfg,
			&err)) == NULL) {
		msg_err ("cannot open backend after reload: %e", err);
		g_error_free (err);
		rep.reply.reload.status = err->code;
	}
	else {
		rep.reply.reload.status = 0;
	}

	if (ctx->backend && worker->index == 0) {
		rspamd_fuzzy_backend_start_update (ctx->backend, ctx->sync_timeout,
				rspamd_fuzzy_storage_periodic_callback, ctx);
	}

	if (write (fd, &rep, sizeof (rep)) != sizeof (rep)) {
		msg_err ("cannot write reply to the control socket: %s",
				strerror (errno));
	}

	return TRUE;
}

static ucl_object_t *
rspamd_fuzzy_storage_stat_key (struct fuzzy_key_stat *key_stat)
{
	ucl_object_t *res;

	res = ucl_object_typed_new (UCL_OBJECT);

	ucl_object_insert_key (res, ucl_object_fromint (key_stat->checked),
			"checked", 0, false);
	ucl_object_insert_key (res, ucl_object_fromint (key_stat->matched),
			"matched", 0, false);
	ucl_object_insert_key (res, ucl_object_fromint (key_stat->added),
			"added", 0, false);
	ucl_object_insert_key (res, ucl_object_fromint (key_stat->deleted),
			"deleted", 0, false);
	ucl_object_insert_key (res, ucl_object_fromint (key_stat->errors),
			"errors", 0, false);

	return res;
}

static ucl_object_t *
rspamd_fuzzy_stat_to_ucl (struct rspamd_fuzzy_storage_ctx *ctx, gboolean ip_stat)
{
	GHashTableIter it, ip_it;
	GHashTable *ip_hash;
	struct fuzzy_key_stat *key_stat;
	struct fuzzy_key *key;
	rspamd_lru_element_t *lru_elt;
	ucl_object_t *obj, *keys_obj, *elt, *ip_elt, *ip_cur;
	gpointer k, v;
	gint i;
	gchar keyname[17];

	obj = ucl_object_typed_new (UCL_OBJECT);

	keys_obj = ucl_object_typed_new (UCL_OBJECT);
	g_hash_table_iter_init (&it, ctx->keys);

	while (g_hash_table_iter_next (&it, &k, &v)) {
		key = v;
		key_stat = key->stat;

		if (key_stat) {
			rspamd_snprintf (keyname, sizeof (keyname), "%8bs", k);

			elt = rspamd_fuzzy_storage_stat_key (key_stat);

			if (key_stat->last_ips && ip_stat) {
				ip_hash = rspamd_lru_hash_get_htable (key_stat->last_ips);

				if (ip_hash) {
					g_hash_table_iter_init (&ip_it, ip_hash);
					ip_elt = ucl_object_typed_new (UCL_OBJECT);

					while (g_hash_table_iter_next (&ip_it, &k, &v)) {
						lru_elt = v;
						ip_cur = rspamd_fuzzy_storage_stat_key (
								rspamd_lru_hash_element_data (lru_elt));
						ucl_object_insert_key (ip_elt, ip_cur,
								rspamd_inet_address_to_string (k), 0, true);
					}

					ucl_object_insert_key (elt, ip_elt, "ips", 0, false);
				}
			}

			ucl_object_insert_key (keys_obj, elt, keyname, 0, true);
		}
	}

	ucl_object_insert_key (obj, keys_obj, "keys", 0, false);

	/* Now generic stats */
	ucl_object_insert_key (obj,
			ucl_object_fromint (ctx->stat.fuzzy_hashes),
			"fuzzy_stored",
			0,
			false);
	ucl_object_insert_key (obj,
			ucl_object_fromint (ctx->stat.fuzzy_hashes_expired),
			"fuzzy_expired",
			0,
			false);
	ucl_object_insert_key (obj,
			ucl_object_fromint (ctx->stat.invalid_requests),
			"invalid_requests",
			0,
			false);

	if (ctx->errors_ips && ip_stat) {
		ip_hash = rspamd_lru_hash_get_htable (ctx->errors_ips);

		if (ip_hash) {
			g_hash_table_iter_init (&ip_it, ip_hash);
			ip_elt = ucl_object_typed_new (UCL_OBJECT);

			while (g_hash_table_iter_next (&ip_it, &k, &v)) {
				lru_elt = v;

				ucl_object_insert_key (ip_elt,
						ucl_object_fromint (*(guint64 *)
								rspamd_lru_hash_element_data (lru_elt)),
						rspamd_inet_address_to_string (k), 0, true);
			}

			ucl_object_insert_key (obj,
					ip_elt,
					"errors_ips",
					0,
					false);
		}
	}

	/* Checked by epoch */
	elt = ucl_object_typed_new (UCL_ARRAY);

	for (i = RSPAMD_FUZZY_EPOCH6; i < RSPAMD_FUZZY_EPOCH_MAX; i++) {
		ucl_array_append (elt,
				ucl_object_fromint (ctx->stat.fuzzy_hashes_checked[i]));
	}

	ucl_object_insert_key (obj, elt, "fuzzy_checked", 0, false);

	/* Shingles by epoch */
	elt = ucl_object_typed_new (UCL_ARRAY);

	for (i = RSPAMD_FUZZY_EPOCH6; i < RSPAMD_FUZZY_EPOCH_MAX; i++) {
		ucl_array_append (elt,
				ucl_object_fromint (ctx->stat.fuzzy_shingles_checked[i]));
	}

	ucl_object_insert_key (obj, elt, "fuzzy_shingles", 0, false);

	/* Matched by epoch */
	elt = ucl_object_typed_new (UCL_ARRAY);

	for (i = RSPAMD_FUZZY_EPOCH6; i < RSPAMD_FUZZY_EPOCH_MAX; i++) {
		ucl_array_append (elt,
				ucl_object_fromint (ctx->stat.fuzzy_hashes_found[i]));
	}

	ucl_object_insert_key (obj, elt, "fuzzy_found", 0, false);


	return obj;
}

static gboolean
rspamd_fuzzy_storage_stat (struct rspamd_main *rspamd_main,
		struct rspamd_worker *worker, gint fd,
		gint attached_fd,
		struct rspamd_control_command *cmd,
		gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;
	struct rspamd_control_reply rep;
	ucl_object_t *obj;
	struct ucl_emitter_functions *emit_subr;
	guchar fdspace[CMSG_SPACE(sizeof (int))];
	struct iovec iov;
	struct msghdr msg;
	struct cmsghdr *cmsg;

	gint outfd = -1;
	gchar tmppath[PATH_MAX];

	memset (&rep, 0, sizeof (rep));
	rep.type = RSPAMD_CONTROL_RELOAD;

	rspamd_snprintf (tmppath, sizeof (tmppath), "%s%c%s-XXXXXXXXXX",
			rspamd_main->cfg->temp_dir, G_DIR_SEPARATOR, "fuzzy-stat");

	if ((outfd = mkstemp (tmppath)) == -1) {
		rep.reply.fuzzy_stat.status = errno;
		msg_info_main ("cannot make temporary stat file for fuzzy stat: %s",
			strerror (errno));
	}
	else {
		rep.reply.fuzzy_stat.status = 0;

		memcpy (rep.reply.fuzzy_stat.storage_id,
				rspamd_fuzzy_backend_id (ctx->backend),
				sizeof (rep.reply.fuzzy_stat.storage_id));

		obj = rspamd_fuzzy_stat_to_ucl (ctx, TRUE);
		emit_subr = ucl_object_emit_fd_funcs (outfd);
		ucl_object_emit_full (obj, UCL_EMIT_JSON_COMPACT, emit_subr, NULL);
		ucl_object_emit_funcs_free (emit_subr);
		ucl_object_unref (obj);
		/* Rewind output file */
		close (outfd);
		outfd = open (tmppath, O_RDONLY);
		unlink (tmppath);
	}

	/* Now we can send outfd and status message */
	memset (&msg, 0, sizeof (msg));

	/* Attach fd to the message */
	if (outfd != -1) {
		memset (fdspace, 0, sizeof (fdspace));
		msg.msg_control = fdspace;
		msg.msg_controllen = sizeof (fdspace);
		cmsg = CMSG_FIRSTHDR (&msg);

		if (cmsg) {
			cmsg->cmsg_level = SOL_SOCKET;
			cmsg->cmsg_type = SCM_RIGHTS;
			cmsg->cmsg_len = CMSG_LEN (sizeof (int));
			memcpy (CMSG_DATA (cmsg), &outfd, sizeof (int));
		}
	}

	iov.iov_base = &rep;
	iov.iov_len = sizeof (rep);
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;

	if (sendmsg (fd, &msg, 0) == -1) {
		msg_err_main ("cannot send fuzzy stat: %s", strerror (errno));
	}

	if (outfd != -1) {
		close (outfd);
	}

	return TRUE;
}

static gboolean
fuzzy_storage_parse_mirror (rspamd_mempool_t *pool,
	const ucl_object_t *obj,
	gpointer ud,
	struct rspamd_rcl_section *section,
	GError **err)
{
	const ucl_object_t *elt;
	struct rspamd_fuzzy_mirror *up = NULL;
	struct rspamd_rcl_struct_parser *pd = ud;
	struct rspamd_fuzzy_storage_ctx *ctx;

	ctx = pd->user_struct;

	if (ucl_object_type (obj) != UCL_OBJECT) {
		g_set_error (err, g_quark_try_string ("fuzzy"), 100,
				"mirror/slave option must be an object");

		return FALSE;
	}

	elt = ucl_object_lookup (obj, "name");
	if (elt == NULL) {
		g_set_error (err, g_quark_try_string ("fuzzy"), 100,
				"mirror option must have some name definition");

		return FALSE;
	}

	up = g_malloc0 (sizeof (*up));
	up->name = g_strdup (ucl_object_tostring (elt));

	elt = ucl_object_lookup (obj, "key");
	if (elt != NULL) {
		up->key = rspamd_pubkey_from_base32 (ucl_object_tostring (elt), 0,
				RSPAMD_KEYPAIR_KEX, RSPAMD_CRYPTOBOX_MODE_25519);
	}

	if (up->key == NULL) {
		g_set_error (err, g_quark_try_string ("fuzzy"), 100,
				"cannot read mirror key");

		goto err;
	}

	elt = ucl_object_lookup (obj, "hosts");

	if (elt == NULL) {
		g_set_error (err, g_quark_try_string ("fuzzy"), 100,
				"mirror option must have some hosts definition");

		goto err;
	}

	up->u = rspamd_upstreams_create (ctx->cfg->ups_ctx);
	if (!rspamd_upstreams_from_ucl (up->u, elt, 11335, NULL)) {
		g_set_error (err,  g_quark_try_string ("fuzzy"), 100,
				"mirror has bad hosts definition");

		goto err;
	}

	g_ptr_array_add (ctx->mirrors, up);

	return TRUE;

err:
	g_free (up->name);
	rspamd_upstreams_destroy (up->u);

	if (up->key) {
		rspamd_pubkey_unref (up->key);
	}

	g_free (up);

	return FALSE;
}

static gboolean
fuzzy_storage_parse_master_flags (rspamd_mempool_t *pool,
	const ucl_object_t *obj,
	gpointer ud,
	struct rspamd_rcl_section *section,
	GError **err)
{
	const ucl_object_t *cur;
	struct rspamd_rcl_struct_parser *pd = ud;
	struct rspamd_fuzzy_storage_ctx *ctx;
	ucl_object_iter_t it = NULL;
	gulong remote_flag;
	gint64 local_flag;

	ctx = pd->user_struct;

	if (ucl_object_type (obj) != UCL_OBJECT) {
		g_set_error (err, g_quark_try_string ("fuzzy"), 100,
				"master_flags option must be an object");

		return FALSE;
	}

	while ((cur = ucl_iterate_object (obj, &it, true)) != NULL) {
		if (rspamd_strtoul (cur->key, cur->keylen, &remote_flag) &&
				ucl_object_toint_safe (cur, (int64_t *)&local_flag)) {
			g_hash_table_insert (ctx->master_flags, GUINT_TO_POINTER (remote_flag),
					GUINT_TO_POINTER (local_flag));
		}
	}

	return TRUE;
}


static gboolean
fuzzy_parse_keypair (rspamd_mempool_t *pool,
		const ucl_object_t *obj,
		gpointer ud,
		struct rspamd_rcl_section *section,
		GError **err)
{
	struct rspamd_rcl_struct_parser *pd = ud;
	struct rspamd_fuzzy_storage_ctx *ctx;
	struct rspamd_cryptobox_keypair *kp;
	struct fuzzy_key_stat *keystat;
	struct fuzzy_key *key;
	const ucl_object_t *cur;
	const guchar *pk;
	ucl_object_iter_t it = NULL;
	gboolean ret;

	ctx = pd->user_struct;
	pd->offset = G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, default_keypair);

	/*
	 * Single key
	 */
	if (ucl_object_type (obj) == UCL_STRING || ucl_object_type (obj)
			== UCL_OBJECT) {
		ret = rspamd_rcl_parse_struct_keypair (pool, obj, pd, section, err);

		if (!ret) {
			return ret;
		}

		/* Insert key to the hash table */
		kp = ctx->default_keypair;

		if (kp == NULL) {
			return FALSE;
		}

		if (rspamd_keypair_alg (kp) != RSPAMD_CRYPTOBOX_MODE_25519 ||
				rspamd_keypair_type (kp) != RSPAMD_KEYPAIR_KEX) {
			return FALSE;
		}

		key = rspamd_mempool_alloc0 (pool, sizeof (*key));
		key->key = kp;
		keystat = rspamd_mempool_alloc0 (pool, sizeof (*keystat));
		/* Hash of ip -> fuzzy_key_stat */
		keystat->last_ips = rspamd_lru_hash_new_full (1024,
				(GDestroyNotify) rspamd_inet_address_free, fuzzy_key_stat_dtor,
				rspamd_inet_address_hash, rspamd_inet_address_equal);
		key->stat = keystat;
		pk = rspamd_keypair_component (kp, RSPAMD_KEYPAIR_COMPONENT_PK,
				NULL);
		g_hash_table_insert (ctx->keys, (gpointer)pk, key);
		ctx->default_key = key;
		msg_info_pool ("loaded keypair %*xs", 8, pk);
	}
	else if (ucl_object_type (obj) == UCL_ARRAY) {
		while ((cur = ucl_object_iterate (obj, &it, true)) != NULL) {
			if (!fuzzy_parse_keypair (pool, cur, pd, section, err)) {
				msg_err_pool ("cannot parse keypair");
			}
		}
	}

	return TRUE;
}

static guint
fuzzy_kp_hash (gconstpointer p)
{
	return *(guint *)p;
}

static gboolean
fuzzy_kp_equal (gconstpointer a, gconstpointer b)
{
	const guchar *pa = a, *pb = b;

	return (memcmp (pa, pb, RSPAMD_FUZZY_KEYLEN) == 0);
}

gpointer
init_fuzzy (struct rspamd_config *cfg)
{
	struct rspamd_fuzzy_storage_ctx *ctx;
	GQuark type;

	type = g_quark_try_string ("fuzzy");

	ctx = rspamd_mempool_alloc0 (cfg->cfg_pool,
			sizeof (struct rspamd_fuzzy_storage_ctx));

	ctx->magic = rspamd_fuzzy_storage_magic;
	ctx->sync_timeout = DEFAULT_SYNC_TIMEOUT;
	ctx->master_timeout = DEFAULT_MASTER_TIMEOUT;
	ctx->keypair_cache_size = DEFAULT_KEYPAIR_CACHE_SIZE;
	ctx->keys = g_hash_table_new_full (fuzzy_kp_hash, fuzzy_kp_equal,
			NULL, fuzzy_key_dtor);
	rspamd_mempool_add_destructor (cfg->cfg_pool,
			(rspamd_mempool_destruct_t)g_hash_table_unref, ctx->keys);
	ctx->master_flags = g_hash_table_new (g_direct_hash, g_direct_equal);
	rspamd_mempool_add_destructor (cfg->cfg_pool,
			(rspamd_mempool_destruct_t)g_hash_table_unref, ctx->master_flags);
	ctx->errors_ips = rspamd_lru_hash_new_full (1024,
			(GDestroyNotify) rspamd_inet_address_free, g_free,
			rspamd_inet_address_hash, rspamd_inet_address_equal);
	rspamd_mempool_add_destructor (cfg->cfg_pool,
			(rspamd_mempool_destruct_t)rspamd_lru_hash_destroy, ctx->errors_ips);
	ctx->cfg = cfg;
	ctx->mirrors = g_ptr_array_new ();
	rspamd_mempool_add_destructor (cfg->cfg_pool,
			(rspamd_mempool_destruct_t)rspamd_ptr_array_free_hard, ctx->mirrors);
	ctx->updates_maxfail = DEFAULT_UPDATES_MAXFAIL;
	ctx->collection_id_file = RSPAMD_DBDIR "/fuzzy_collection.id";

	rspamd_rcl_register_worker_option (cfg,
			type,
			"hashfile",
			rspamd_rcl_parse_struct_string,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, hashfile),
			0,
			"Path to fuzzy database");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"hash_file",
			rspamd_rcl_parse_struct_string,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, hashfile),
			0,
			"Path to fuzzy database (alias for hashfile)");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"file",
			rspamd_rcl_parse_struct_string,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, hashfile),
			0,
			"Path to fuzzy database (alias for hashfile)");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"database",
			rspamd_rcl_parse_struct_string,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, hashfile),
			0,
			"Path to fuzzy database (alias for hashfile)");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"sync",
			rspamd_rcl_parse_struct_time,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx,
						sync_timeout),
			RSPAMD_CL_FLAG_TIME_FLOAT,
			"Time to perform database sync, default: "
			G_STRINGIFY (DEFAULT_SYNC_TIMEOUT) " seconds");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"expire",
			rspamd_rcl_parse_struct_time,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx,
						expire),
			RSPAMD_CL_FLAG_TIME_FLOAT,
			"Default expire time for hashes, default: "
			G_STRINGIFY (DEFAULT_EXPIRE) " seconds");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"allow_update",
			rspamd_rcl_parse_struct_ucl,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, update_map),
			0,
			"Allow modifications from the following IP addresses");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"keypair",
			fuzzy_parse_keypair,
			ctx,
			0,
			RSPAMD_CL_FLAG_MULTIPLE,
			"Encryption keypair (can be repeated for different keys)");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"keypair_cache_size",
			rspamd_rcl_parse_struct_integer,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx,
						keypair_cache_size),
			RSPAMD_CL_FLAG_UINT,
			"Size of keypairs cache, default: "
					G_STRINGIFY (DEFAULT_KEYPAIR_CACHE_SIZE));

	rspamd_rcl_register_worker_option (cfg,
			type,
			"encrypted_only",
			rspamd_rcl_parse_struct_boolean,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, encrypted_only),
			0,
			"Allow encrypted requests only (and forbid all unknown keys or plaintext requests)");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"master_timeout",
			rspamd_rcl_parse_struct_time,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, master_timeout),
			RSPAMD_CL_FLAG_TIME_FLOAT,
			"Master protocol IO timeout");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"sync_keypair",
			rspamd_rcl_parse_struct_keypair,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, sync_keypair),
			0,
			"Encryption key for master/slave updates");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"masters",
			rspamd_rcl_parse_struct_ucl,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, masters_map),
			0,
			"Allow master/slave updates from the following IP addresses");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"master_key",
			rspamd_rcl_parse_struct_pubkey,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, master_key),
			0,
			"Allow master/slave updates merely using the specified key");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"mirror",
			fuzzy_storage_parse_mirror,
			ctx,
			0,
			RSPAMD_CL_FLAG_MULTIPLE,
			"List of slave hosts");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"slave",
			fuzzy_storage_parse_mirror,
			ctx,
			0,
			RSPAMD_CL_FLAG_MULTIPLE,
			"List of slave hosts");

	rspamd_rcl_register_worker_option (cfg,
			type,
			"master_flags",
			fuzzy_storage_parse_master_flags,
			ctx,
			0,
			0,
			"Map of flags in form master_flags = { master_flag = local_flag; ... }; ");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"updates_maxfail",
			rspamd_rcl_parse_struct_integer,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, updates_maxfail),
			RSPAMD_CL_FLAG_UINT,
			"Maximum number of updates to be failed before discarding");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"collection_only",
			rspamd_rcl_parse_struct_boolean,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, collection_mode),
			0,
			"Start fuzzy in collection only mode");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"collection_signkey",
			rspamd_rcl_parse_struct_pubkey,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, collection_sign_key),
			RSPAMD_CL_FLAG_SIGNKEY,
			"Accept only signed requests with the specified key");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"collection_keypair",
			rspamd_rcl_parse_struct_keypair,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, collection_keypair),
			0,
			"Use the specified keypair to encrypt collection protocol");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"collection_id_file",
			rspamd_rcl_parse_struct_string,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, collection_id_file),
			RSPAMD_CL_FLAG_STRING_PATH,
			"Store collection epoch in the desired file");
	rspamd_rcl_register_worker_option (cfg,
			type,
			"skip_hashes",
			rspamd_rcl_parse_struct_ucl,
			ctx,
			G_STRUCT_OFFSET (struct rspamd_fuzzy_storage_ctx, skip_map),
			0,
			"Skip specific hashes from the map");

	return ctx;
}

static void
rspamd_fuzzy_peer_io (gint fd, gshort what, gpointer d)
{
	struct fuzzy_peer_cmd cmd;
	struct rspamd_fuzzy_storage_ctx *ctx = d;
	gssize r;

	r = read (fd, &cmd, sizeof (cmd));

	if (r != sizeof (cmd)) {
		if (errno == EINTR) {
			rspamd_fuzzy_peer_io (fd, what, d);
			return;
		}
		if (errno != EAGAIN) {
			msg_err ("cannot read command from peers: %s", strerror (errno));
		}
	}
	else {
		g_array_append_val (ctx->updates_pending, cmd);
	}
}

static void
fuzzy_peer_rep (struct rspamd_worker *worker,
		struct rspamd_srv_reply *rep, gint rep_fd,
		gpointer ud)
{
	struct rspamd_fuzzy_storage_ctx *ctx = ud;
	GList *cur;
	struct rspamd_worker_listen_socket *ls;
	struct event *accept_events;

	ctx->peer_fd = rep_fd;

	if (rep_fd == -1) {
		msg_err ("cannot receive peer fd from the main process");
		exit (EXIT_FAILURE);
	}
	else {
		rspamd_socket_nonblocking (rep_fd);
	}

	/* Start listening */
	cur = worker->cf->listen_socks;
	while (cur) {
		ls = cur->data;

		if (ls->fd != -1) {
			if (ls->type == RSPAMD_WORKER_SOCKET_UDP) {
				accept_events = g_malloc0 (sizeof (struct event) * 2);
				event_set (&accept_events[0], ls->fd, EV_READ | EV_PERSIST,
						accept_fuzzy_socket, worker);
				event_base_set (ctx->ev_base, &accept_events[0]);
				event_add (&accept_events[0], NULL);
				worker->accept_events = g_list_prepend (worker->accept_events,
						accept_events);
			}
			else if (worker->index == 0) {
				/* We allow TCP listeners only for a update worker */
				accept_events = g_malloc0 (sizeof (struct event) * 2);

				if (ctx->collection_mode) {
					event_set (&accept_events[0], ls->fd, EV_READ | EV_PERSIST,
							accept_fuzzy_collection_socket, worker);
				}
				else {
					event_set (&accept_events[0], ls->fd, EV_READ | EV_PERSIST,
							accept_fuzzy_mirror_socket, worker);
				}
				event_base_set (ctx->ev_base, &accept_events[0]);
				event_add (&accept_events[0], NULL);
				worker->accept_events = g_list_prepend (worker->accept_events,
						accept_events);
			}
		}

		cur = g_list_next (cur);
	}

	if (worker->index == 0 && ctx->peer_fd != -1) {
		/* Listen for peer requests */
		event_set (&ctx->peer_ev, ctx->peer_fd, EV_READ | EV_PERSIST,
				rspamd_fuzzy_peer_io, ctx);
		event_base_set (ctx->ev_base, &ctx->peer_ev);
		event_add (&ctx->peer_ev, NULL);
	}
}

/*
 * Start worker process
 */
void
start_fuzzy (struct rspamd_worker *worker)
{
	struct rspamd_fuzzy_storage_ctx *ctx = worker->ctx;
	GError *err = NULL;
	struct rspamd_srv_command srv_cmd;
	struct rspamd_config *cfg = worker->srv->cfg;

	ctx->ev_base = rspamd_prepare_worker (worker,
			"fuzzy",
			NULL);
	ctx->peer_fd = -1;
	ctx->worker = worker;
	ctx->cfg = worker->srv->cfg;
	double_to_tv (ctx->master_timeout, &ctx->master_io_tv);

	ctx->resolver = dns_resolver_init (worker->srv->logger,
			ctx->ev_base,
			worker->srv->cfg);
	rspamd_upstreams_library_config (worker->srv->cfg, ctx->cfg->ups_ctx,
			ctx->ev_base, ctx->resolver->r);
	if (ctx->keypair_cache_size > 0) {
		/* Create keypairs cache */
		ctx->keypair_cache = rspamd_keypair_cache_new (ctx->keypair_cache_size);
	}

	if (!ctx->collection_mode) {
		/*
		 * Open DB and perform VACUUM
		 */
		if ((ctx->backend = rspamd_fuzzy_backend_create (ctx->ev_base,
				worker->cf->options, cfg, &err)) == NULL) {
			msg_err ("cannot open backend: %e", err);
			if (err) {
				g_error_free (err);
			}
			exit (EXIT_SUCCESS);
		}

		rspamd_fuzzy_backend_count (ctx->backend, fuzzy_count_callback, ctx);


		if (worker->index == 0) {
			ctx->updates_pending = g_array_sized_new (FALSE, FALSE,
					sizeof (struct fuzzy_peer_cmd), 1024);
			rspamd_fuzzy_backend_start_update (ctx->backend, ctx->sync_timeout,
					rspamd_fuzzy_storage_periodic_callback, ctx);
		}

		double_to_tv (ctx->sync_timeout, &ctx->stat_tv);
		event_set (&ctx->stat_ev, -1, EV_TIMEOUT, rspamd_fuzzy_stat_callback, ctx);
		event_base_set (ctx->ev_base, &ctx->stat_ev);
		event_add (&ctx->stat_ev, &ctx->stat_tv);

		/* Register custom reload and stat commands for the control socket */
		rspamd_control_worker_add_cmd_handler (worker, RSPAMD_CONTROL_RELOAD,
				rspamd_fuzzy_storage_reload, ctx);
		rspamd_control_worker_add_cmd_handler (worker, RSPAMD_CONTROL_FUZZY_STAT,
				rspamd_fuzzy_storage_stat, ctx);
		rspamd_control_worker_add_cmd_handler (worker, RSPAMD_CONTROL_FUZZY_SYNC,
				rspamd_fuzzy_storage_sync, ctx);
	}
	else {
		/*
		 * In collection mode we do a different thing:
		 * we collect fuzzy hashes in the updates queue and ignore all read commands
		 */
		if (worker->index == 0) {
			ctx->updates_pending = g_array_sized_new (FALSE, FALSE,
					sizeof (struct fuzzy_peer_cmd), 1024);
			double_to_tv (ctx->sync_timeout, &ctx->stat_tv);
			event_set (&ctx->stat_ev, -1, EV_TIMEOUT|EV_PERSIST,
					rspamd_fuzzy_collection_periodic, ctx);
			event_base_set (ctx->ev_base, &ctx->stat_ev);
			event_add (&ctx->stat_ev, &ctx->stat_tv);

			ctx->collection_rt = rspamd_http_router_new (
					rspamd_fuzzy_collection_error_handler,
					rspamd_fuzzy_collection_finish_handler,
					&ctx->stat_tv,
					ctx->ev_base,
					NULL, ctx->keypair_cache);

			if (ctx->collection_keypair) {
				rspamd_http_router_set_key (ctx->collection_rt,
						ctx->collection_keypair);
			}

			/* Try to load collection id */
			if (ctx->collection_id_file) {
				gint fd;

				fd = rspamd_file_xopen (ctx->collection_id_file, O_RDONLY, 0,
						FALSE);

				if (fd == -1) {
					if (errno != ENOENT) {
						msg_err ("cannot open collection id from %s: %s",
								ctx->collection_id_file, strerror (errno));
					}

					ctx->collection_id = 0;
				}
				else {
					if (read (fd, &ctx->collection_id,
							sizeof (ctx->collection_id)) == -1) {
						msg_err ("cannot read collection id from %s: %s",
								ctx->collection_id_file, strerror (errno));
						ctx->collection_id = 0;
					}

					close (fd);
				}
			}

			/* Generate new cookie */
			ottery_rand_bytes (ctx->cookie, sizeof (ctx->cookie));
			/* Register paths */
			rspamd_http_router_add_path (ctx->collection_rt,
					"/cookie",
					rspamd_fuzzy_collection_cookie);
			rspamd_http_router_add_path (ctx->collection_rt,
					"/data",
					rspamd_fuzzy_collection_data);
		}
	}

	if (ctx->mirrors && ctx->mirrors->len != 0) {
		if (ctx->sync_keypair == NULL) {
			GString *pk_str = NULL;

			ctx->sync_keypair = rspamd_keypair_new (RSPAMD_KEYPAIR_KEX,
					RSPAMD_CRYPTOBOX_MODE_25519);
			pk_str = rspamd_keypair_print (ctx->sync_keypair,
								RSPAMD_KEYPAIR_COMPONENT_PK|RSPAMD_KEYPAIR_BASE32);
			msg_warn_config ("generating new temporary keypair for communicating"
					" with slave hosts, pk is %s", pk_str->str);
			g_string_free (pk_str, TRUE);
		}
	}

	/* Create radix trees */
	if (ctx->update_map != NULL) {
		rspamd_config_radix_from_ucl (worker->srv->cfg, ctx->update_map,
				"Allow fuzzy updates from specified addresses",
				&ctx->update_ips, NULL);
	}
	if (ctx->masters_map != NULL) {
		rspamd_config_radix_from_ucl (worker->srv->cfg, ctx->masters_map,
				"Allow fuzzy master/slave updates from specified addresses",
				&ctx->master_ips, NULL);
	}
	if (ctx->skip_map != NULL) {
		struct rspamd_map *m;

		if ((m = rspamd_map_add_from_ucl (cfg, ctx->skip_map,
				"Skip hashes", rspamd_kv_list_read, rspamd_kv_list_fin,
				(void **)&ctx->skip_hashes)) == NULL) {
			msg_warn_config ("cannot load hashes list from %s",
					ucl_object_tostring (ctx->skip_map));
		}
		else {
			m->active_http = TRUE;
		}
	}

	/* Maps events */
	ctx->resolver = dns_resolver_init (worker->srv->logger,
				ctx->ev_base,
				worker->srv->cfg);
	rspamd_map_watch (worker->srv->cfg, ctx->ev_base, ctx->resolver, 0);

	/* Get peer pipe */
	memset (&srv_cmd, 0, sizeof (srv_cmd));
	srv_cmd.type = RSPAMD_SRV_SOCKETPAIR;
	srv_cmd.cmd.spair.af = SOCK_DGRAM;
	srv_cmd.cmd.spair.pair_num = worker->index;
	memset (srv_cmd.cmd.spair.pair_id, 0, sizeof (srv_cmd.cmd.spair.pair_id));
	memcpy (srv_cmd.cmd.spair.pair_id, "fuzzy", sizeof ("fuzzy"));

	rspamd_srv_send_command (worker, ctx->ev_base, &srv_cmd, -1,
			fuzzy_peer_rep, ctx);

	event_base_loop (ctx->ev_base, 0);
	rspamd_worker_block_signals ();

	if (worker->index == 0 && ctx->updates_pending->len > 0) {
		if (!ctx->collection_mode) {
			rspamd_fuzzy_process_updates_queue (ctx, local_db_name, FALSE);
			event_base_loop (ctx->ev_base, 0);
		}
	}

	if (!ctx->collection_mode) {
		rspamd_fuzzy_backend_close (ctx->backend);
	}
	else if (worker->index == 0) {
		gint fd;

		/* Steal keypairs cache... */
		ctx->collection_rt->cache = NULL;
		rspamd_http_router_free (ctx->collection_rt);

		/* Try to save collection id */
		fd = rspamd_file_xopen (ctx->collection_id_file,
				O_WRONLY | O_CREAT | O_TRUNC, 00644, 0);

		if (fd == -1) {
			msg_err ("cannot open collection id to store in %s: %s",
					ctx->collection_id_file, strerror (errno));
		}
		else {
			if (write (fd, &ctx->collection_id,
					sizeof (ctx->collection_id)) == -1) {
				msg_err ("cannot store collection id in %s: %s",
						ctx->collection_id_file, strerror (errno));
			}

			close (fd);
		}

		g_array_free (ctx->updates_pending, TRUE);
	}

	rspamd_log_close (worker->srv->logger);

	if (ctx->peer_fd != -1) {
		if (worker->index == 0) {
			event_del (&ctx->peer_ev);
		}
		close (ctx->peer_fd);
	}

	if (ctx->keypair_cache) {
		rspamd_keypair_cache_destroy (ctx->keypair_cache);
	}

	REF_RELEASE (ctx->cfg);

	exit (EXIT_SUCCESS);
}
