listen_dnsport.h

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/*
 * services/listen_dnsport.h - listen on port 53 for incoming DNS queries.
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 *
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 
#ifndef LISTEN_DNSPORT_H
#define LISTEN_DNSPORT_H
 
#include "util/netevent.h"
struct listen_list;
struct config_file;
struct addrinfo;
struct sldns_buffer;

struct listen_dnsport {
    struct comm_base* base;

    struct sldns_buffer* udp_buff;
#ifdef USE_DNSCRYPT
    struct sldns_buffer* dnscrypt_udp_buff;
#endif
    struct listen_list* cps;
};

struct listen_list {
    struct listen_list* next;
    struct comm_point* com;
};

enum listen_type {
    listen_type_udp,
    listen_type_tcp,
    listen_type_udpancil,
    listen_type_ssl,
    listen_type_udp_dnscrypt,
    listen_type_tcp_dnscrypt,
    listen_type_udpancil_dnscrypt
 
};

struct listen_port {
    struct listen_port* next;
    int fd;
    enum listen_type ftype;
};

struct listen_port* listening_ports_open(struct config_file* cfg,
    int* reuseport);

void listening_ports_free(struct listen_port* list);

struct listen_dnsport* listen_create(struct comm_base* base,
    struct listen_port* ports, size_t bufsize, int tcp_accept_count,
    void* sslctx, struct dt_env *dtenv, comm_point_callback_type* cb,
    void* cb_arg);

void listen_delete(struct listen_dnsport* listen);

void listen_list_delete(struct listen_list* list);

size_t listen_get_mem(struct listen_dnsport* listen);

void listen_stop_accept(struct listen_dnsport* listen);

void listen_start_accept(struct listen_dnsport* listen);

int create_udp_sock(int family, int socktype, struct sockaddr* addr, 
    socklen_t addrlen, int v6only, int* inuse, int* noproto, int rcv,
    int snd, int listen, int* reuseport, int transparent, int freebind, int use_systemd);

int create_tcp_accept_sock(struct addrinfo *addr, int v6only, int* noproto,
    int* reuseport, int transparent, int mss, int freebind, int use_systemd);

int create_local_accept_sock(const char* path, int* noproto, int use_systemd);
 
#endif /* LISTEN_DNSPORT_H */