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99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
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* Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
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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_sock_dns DNS sock API
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* @ingroup net_sock
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*
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* @brief Sock DNS client
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*
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* @{
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*
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* @file
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* @brief DNS sock definitions
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*/
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#ifndef NET_SOCK_DNS_H
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#define NET_SOCK_DNS_H
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#include <errno.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "net/sock/udp.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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* @brief DNS internal structure
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*/
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typedef struct {
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uint16_t id; /**< read */
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uint16_t flags; /**< DNS */
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uint16_t qdcount; /**< RFC */
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uint16_t ancount; /**< for */
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uint16_t nscount; /**< detailed */
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uint16_t arcount; /**< explanations */
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uint8_t payload[]; /**< !! */
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} sock_dns_hdr_t;
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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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#define SOCK_DNS_PORT (53)
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#define SOCK_DNS_RETRIES (2)
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#define SOCK_DNS_BUF_LEN (128) /* we're in embedded context. */
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#define SOCK_DNS_MAX_NAME_LEN (SOCK_DNS_BUF_LEN - sizeof(sock_dns_hdr_t) - 4)
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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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int sock_dns_query(const char *domain_name, void *addr_out, int family);
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/**
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* @brief global DNS server endpoint
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*/
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extern sock_udp_ep_t sock_dns_server;
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_SOCK_DNS_H */
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/** @} */
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