dns.h
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1 /*
2  * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
3  * SPDX-License-Identifier: LGPL-2.1-only
4  */
5 
6 #pragma once
7 
20 #include "modules.h"
21 #include "net/af.h"
22 #if IS_USED(MODULE_HOSTS)
23 # include "net/hosts.h"
24 #endif
25 #if IS_USED(MODULE_SOCK_DNS) || IS_USED(MODULE_SOCK_DNS_MOCK)
26 # include "net/sock/dns.h"
27 #endif
28 #if IS_USED(MODULE_SOCK_DODTLS)
29 # include "net/sock/dodtls.h"
30 #endif
31 #if IS_USED(MODULE_GCOAP_DNS)
32 # include "net/gcoap/dns.h"
33 #endif
34 
35 #ifdef __cplusplus
36 extern "C" {
37 #endif
38 
43 #define DNS_TYPE_A (1)
44 #define DNS_TYPE_AAAA (28)
45 #define DNS_CLASS_IN (1)
52 #define RR_TYPE_LENGTH (2U)
53 #define RR_CLASS_LENGTH (2U)
54 #define RR_TTL_LENGTH (4U)
55 #define RR_RDLENGTH_LENGTH (2U)
80 static inline int dns_query(const char *domain_name, void *addr_out, int family)
81 {
82  (void)domain_name;
83  (void)addr_out;
84 
85  int res = -ENOTSUP;
86 
87  if (family == AF_UNSPEC) {
88  if (!IS_USED(MODULE_IPV4_ADDR)) {
89  family = AF_INET6;
90  }
91  else if (!IS_USED(MODULE_IPV6_ADDR)) {
92  family = AF_INET;
93  }
94  }
95 
96 #if IS_USED(MODULE_HOSTS)
97  if (res <= 0) {
98  res = hosts_query(domain_name, addr_out, family);
99  }
100 #endif
101 #if IS_USED(MODULE_GCOAP_DNS)
102  if (res <= 0) {
103  res = gcoap_dns_query(domain_name, addr_out, family);
104  }
105 #endif
106 #if IS_USED(MODULE_SOCK_DODTLS)
107  if (res <= 0) {
108  res = sock_dodtls_query(domain_name, addr_out, family);
109  }
110 #endif
111 #if IS_USED(MODULE_SOCK_DNS) || IS_USED(MODULE_SOCK_DNS_MOCK)
112  if (res <= 0) {
113  res = sock_dns_query(domain_name, addr_out, family);
114  }
115 #endif
116 
117  return res;
118 }
119 
120 #ifdef __cplusplus
121 }
122 #endif
123 
af.h
Global UNIX address family definitions.
dodtls.h
DNS over DTLS sock definitions.
dns.h
gcoap_dns definitions
ENOTSUP
#define ENOTSUP
Not supported (may be the same value as [EOPNOTSUPP]).
Definition: errno.h:129
AF_INET6
@ AF_INET6
internetwork address family with IPv6: UDP, TCP, etc.
Definition: af.h:36
AF_INET
@ AF_INET
internetwork address family: UDP, TCP, etc.
Definition: af.h:34
AF_UNSPEC
@ AF_UNSPEC
unspecified address family
Definition: af.h:28
dns_query
static int dns_query(const char *domain_name, void *addr_out, int family)
Get IP address for DNS name.
Definition: dns.h:80
gcoap_dns_query
int gcoap_dns_query(const char *domain_name, void *addr_out, int family)
Query a domain name via CoAP synchronously.
hosts_query
int hosts_query(const char *host_name, void *addr_out, int family)
Get IP address for a host name.
sock_dns_query
int sock_dns_query(const char *domain_name, void *addr_out, int family)
Get IP address for DNS name.
sock_dodtls_query
int sock_dodtls_query(const char *domain_name, void *addr_out, int family)
Get IP address for DNS name.
hosts.h
Static mappings from hostnames to IP addresses.
modules.h
Common macros and compiler attributes/pragmas configuration.
IS_USED
#define IS_USED(module)
Checks whether a module is being used or not.
Definition: modules.h:67
dns.h
DNS sock definitions.