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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* Copyright (C) 2019 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup net_dns DNS defines
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* @ingroup net
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* @brief Generic DNS values
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* @{
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*
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* @file
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* @brief Generic DNS values
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*
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* @author Martine Lenders <m.lenders@fu-berlin.de>
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*/
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#ifndef NET_DNS_H
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#define NET_DNS_H
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#include "modules.h"
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#include "net/sock/dns.h"
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#include "net/sock/dodtls.h"
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#include "net/gcoap/dns.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @name DNS defines
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* @{
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*/
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#define DNS_TYPE_A (1)
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#define DNS_TYPE_AAAA (28)
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#define DNS_CLASS_IN (1)
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/** @} */
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/**
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* @name Field lengths
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* @{
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*/
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#define RR_TYPE_LENGTH (2U)
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#define RR_CLASS_LENGTH (2U)
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#define RR_TTL_LENGTH (4U)
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#define RR_RDLENGTH_LENGTH (2U)
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/** @} */
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/**
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* @brief Get IP address for DNS name
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*
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* This function will synchronously try to resolve a DNS A or AAAA record by contacting
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* the DNS server specified in the global variable @ref sock_dns_server.
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*
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* By supplying AF_INET, AF_INET6 or AF_UNSPEC in @p family requesting of A
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* records (IPv4), AAAA records (IPv6) or both can be selected.
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*
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* This function will return the first DNS record it receives. IF both A and
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* AAAA are requested, AAAA will be preferred.
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*
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* @note @p addr_out needs to provide space for any possible result!
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* (4byte when family==AF_INET, 16byte otherwise)
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*
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* @param[in] domain_name DNS name to resolve into address
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* @param[out] addr_out buffer to write result into
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* @param[in] family Either AF_INET, AF_INET6 or AF_UNSPEC
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*
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* @return the size of the resolved address on success
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* @return < 0 otherwise
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*/
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static inline int dns_query(const char *domain_name, void *addr_out, int family)
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{
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int res = -ENOTSUP;
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if (family == AF_UNSPEC) {
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if (!IS_USED(MODULE_IPV4_ADDR)) {
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family = AF_INET6;
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}
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else if (!IS_USED(MODULE_IPV6_ADDR)) {
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family = AF_INET;
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}
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}
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if (res <= 0 && IS_USED(MODULE_GCOAP_DNS)) {
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res = gcoap_dns_query(domain_name, addr_out, family);
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}
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if (res <= 0 && IS_USED(MODULE_SOCK_DODTLS)) {
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res = sock_dodtls_query(domain_name, addr_out, family);
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}
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if (res <= 0 && (IS_USED(MODULE_SOCK_DNS) || IS_USED(MODULE_SOCK_DNS_MOCK))) {
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res = sock_dns_query(domain_name, addr_out, family);
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}
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return res;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_DNS_H */
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/** @} */
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