dns.h

Go to the documentation of this file.

/*
 * Copyright (C) 2019 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include "modules.h"
#include "net/af.h"
#if IS_USED(MODULE_HOSTS)
#  include "net/hosts.h"
#endif
#if IS_USED(MODULE_SOCK_DNS) || IS_USED(MODULE_SOCK_DNS_MOCK)
#  include "net/sock/dns.h"
#endif
#if IS_USED(MODULE_SOCK_DODTLS)
#  include "net/sock/dodtls.h"
#endif
#if IS_USED(MODULE_GCOAP_DNS)
#  include "net/gcoap/dns.h"
#endif
 
#ifdef __cplusplus
extern "C" {
#endif

#define DNS_TYPE_A              (1)
#define DNS_TYPE_AAAA           (28)
#define DNS_CLASS_IN            (1)

#define RR_TYPE_LENGTH      (2U)
#define RR_CLASS_LENGTH     (2U)
#define RR_TTL_LENGTH       (4U)
#define RR_RDLENGTH_LENGTH  (2U)

static inline int dns_query(const char *domain_name, void *addr_out, int family)
{
    (void)domain_name;
    (void)addr_out;
 
    int res = -ENOTSUP;
 
    if (family == AF_UNSPEC) {
        if (!IS_USED(MODULE_IPV4_ADDR)) {
            family = AF_INET6;
        }
        else if (!IS_USED(MODULE_IPV6_ADDR)) {
            family = AF_INET;
        }
    }
 
#if IS_USED(MODULE_HOSTS)
    if (res <= 0) {
        res = hosts_query(domain_name, addr_out, family);
    }
#endif
#if IS_USED(MODULE_GCOAP_DNS)
    if (res <= 0) {
        res = gcoap_dns_query(domain_name, addr_out, family);
    }
#endif
#if IS_USED(MODULE_SOCK_DODTLS)
    if (res <= 0) {
        res = sock_dodtls_query(domain_name, addr_out, family);
    }
#endif
#if IS_USED(MODULE_SOCK_DNS) || IS_USED(MODULE_SOCK_DNS_MOCK)
    if (res <= 0) {
        res = sock_dns_query(domain_name, addr_out, family);
    }
#endif
 
    return res;
}
 
#ifdef __cplusplus
}
#endif