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net: lwm2m: add socket-based DNS support

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Previously, the net_app layer handled DNS support as a part of
network initialization.  With the move to BSD-socket APIs,
we need to add support for DNS to the LwM2M library.

Signed-off-by: Michael Scott <mike@foundries.io>
This commit is contained in:
Michael Scott 2019-01-31 09:21:51 -08:00 • committed by Anas Nashif
commit a79087cad1
1 changed files with 28 additions and 0 deletions
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28
subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -38,6 +38,9 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME);
#if defined(CONFIG_LWM2M_DTLS_SUPPORT)
#include <net/tls_credentials.h>
#endif
#if defined(CONFIG_DNS_RESOLVER)
#include <net/dns_resolve.h>
#endif
#include "lwm2m_object.h"
#include "lwm2m_engine.h"
@ -4047,6 +4050,9 @@ int lwm2m_socket_start(struct lwm2m_ctx *client_ctx)
int lwm2m_parse_peerinfo(char *url, struct sockaddr *addr, bool *use_dtls)
{
struct http_parser_url parser;
#if defined(CONFIG_DNS_RESOLVER)
struct addrinfo hints, *res;
#endif
int ret;
u16_t off, len;
u8_t tmp;
@ -4109,7 +4115,29 @@ int lwm2m_parse_peerinfo(char *url, struct sockaddr *addr, bool *use_dtls)
#endif /* CONFIG_NET_IPV4 */
if (ret < 0) {
#if defined(CONFIG_DNS_RESOLVER)
#if defined(CONFIG_NET_IPV6) && defined(CONFIG_NET_IPV4)
hints.ai_family = AF_UNSPEC;
#elif defined(CONFIG_NET_IPV6)
hints.ai_family = AF_INET6;
#else
hints.ai_family = AF_INET;
#endif /* defined(CONFIG_NET_IPV6) && defined(CONFIG_NET_IPV4) */
hints.ai_socktype = SOCK_DGRAM;
ret = getaddrinfo(url + off, NULL, &hints, &res);
if (ret != 0) {
LOG_ERR("Unable to resolve address");
/* DNS error codes don't align with normal errors */
ret = -ENOENT;
goto cleanup;
}
memcpy(addr, res->ai_addr, sizeof(*addr));
addr->sa_family = res->ai_family;
free(res);
#else
goto cleanup;
#endif /* CONFIG_DNS_RESOLVER */
}
/* set port */