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/*
* Copyright 2023 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.
*/
#ifndef RSPAMD_DNS_H
#define RSPAMD_DNS_H
#include "config.h"
#include "mem_pool.h"
#include "async_session.h"
#include "logger.h"
#include "rdns.h"
#include "upstream.h"
#include "libutil/hash.h"
#ifdef __cplusplus
extern "C" {
#endif
struct rspamd_config;
struct rspamd_task;
struct event_loop;
struct rspamd_dns_resolver {
struct rdns_resolver *r;
struct ev_loop *event_loop;
rspamd_lru_hash_t *fails_cache;
void *uidna;
double fails_cache_time;
struct upstream_list *ups;
struct rspamd_config *cfg;
double request_timeout;
unsigned int max_retransmits;
};
/* Rspamd DNS API */
/**
* Init DNS resolver, params are obtained from a config file or system file /etc/resolv.conf
*/
struct rspamd_dns_resolver *rspamd_dns_resolver_init(rspamd_logger_t *logger,
struct ev_loop *ev_base,
struct rspamd_config *cfg);
void rspamd_dns_resolver_deinit(struct rspamd_dns_resolver *resolver);
struct rspamd_dns_request_ud;
/**
* Make a DNS request
* @param resolver resolver object
* @param session async session to register event
* @param pool memory pool for storage
* @param cb callback to call on resolve completing
* @param ud user data for callback
* @param type request type
* @param ... string or ip address based on a request type
* @return TRUE if request was sent.
*/
struct rspamd_dns_request_ud *rspamd_dns_resolver_request(struct rspamd_dns_resolver *resolver,
struct rspamd_async_session *session,
rspamd_mempool_t *pool,
dns_callback_type cb,
gpointer ud,
enum rdns_request_type type,
const char *name);
gboolean rspamd_dns_resolver_request_task(struct rspamd_task *task,
dns_callback_type cb,
gpointer ud,
enum rdns_request_type type,
const char *name);
gboolean rspamd_dns_resolver_request_task_forced(struct rspamd_task *task,
dns_callback_type cb,
gpointer ud,
enum rdns_request_type type,
const char *name);
/**
* Converts a name into idna from UTF8
* @param resolver resolver (must be initialised)
* @param pool optional memory pool (can be NULL, then you need to g_free) the result
* @param name input name
* @param namelen length of input (-1 for zero terminated)
* @return encoded string
*/
char *rspamd_dns_resolver_idna_convert_utf8(struct rspamd_dns_resolver *resolver,
rspamd_mempool_t *pool,
const char *name,
int namelen,
unsigned int *outlen);
#ifdef __cplusplus
}
#endif
#endif
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