/*
 * include/proto/dns.h
 * This file provides functions related to DNS protocol
 *
 * Copyright (C) 2014 Baptiste Assmann <bedis9@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, version 2.1
 * exclusively.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _PROTO_DNS_H
#define _PROTO_DNS_H

#include <types/dns.h>
#include <types/proto_udp.h>

char *dns_str_to_dn_label(const char *string, char *dn, int dn_len);
int dns_str_to_dn_label_len(const char *string);
int dns_hostname_validation(const char *string, char **err);
int dns_build_query(int query_id, int query_type, char *hostname_dn, int hostname_dn_len, char *buf, int bufsize);
struct task *dns_process_resolve(struct task *t);
int dns_init_resolvers(void);
uint16_t dns_rnd16(void);
int dns_validate_dns_response(unsigned char *resp, unsigned char *bufend, char *dn_name, int dn_name_len);
int dns_get_ip_from_response(unsigned char *resp, unsigned char *resp_end,
                             char *dn_name, int dn_name_len, void *currentip,
                             short currentip_sin_family, int family_priority,
                             void **newip, short *newip_sin_family);
void dns_resolve_send(struct dgram_conn *dgram);
void dns_resolve_recv(struct dgram_conn *dgram);
int dns_send_query(struct dns_resolution *resolution);
void dns_print_current_resolutions(struct dns_resolvers *resolvers);
void dns_update_resolvers_timeout(struct dns_resolvers *resolvers);
void dns_reset_resolution(struct dns_resolution *resolution);
int dns_check_resolution_queue(struct dns_resolvers *resolvers);
unsigned short dns_response_get_query_id(unsigned char *resp);

#endif // _PROTO_DNS_H