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gcoap_dns: Add DNS cache support

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This commit is contained in:
Martine Lenders 2022-07-18 16:58:58 +02:00
parent 055d960d5e
commit 2e5a66e7d2
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GPG Key ID: 2134D77A5336DD80
1 changed files with 37 additions and 4 deletions
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41
sys/net/application_layer/gcoap/dns.c
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@ -23,6 +23,7 @@
#include "net/credman.h"
#include "net/gcoap.h"
#include "net/af.h"
#include "net/dns/cache.h"
#include "net/ipv4/addr.h"
#include "net/ipv6/addr.h"
#include "net/sock/dns.h"
@ -52,6 +53,14 @@ typedef struct {
* initialized.
*/
coap_pkt_t *pkt;
#if IS_USED(MODULE_DNS_CACHE) || defined(DOXYGEN)
/**
* @brief The queried hostname
*
* Only required for DNS caching and thus only available with module @ref net_dns_cache
*/
const char *domain_name;
#endif
void *dns_buf; /**< The buffer for the DNS message exchange */
void *addr_out; /**< Pointer to the resulting address */
/**
@ -113,9 +122,14 @@ static ssize_t _send(const void *buf, size_t len, const sock_udp_ep_t *remote,
int gcoap_dns_query(const char *domain_name, void *addr_out, int family)
{
int res;
if ((res = dns_cache_query(domain_name, addr_out, family)) > 0) {
return res;
}
static uint8_t coap_buf[CONFIG_GCOAP_DNS_PDU_BUF_SIZE];
static uint8_t dns_buf[CONFIG_DNS_MSG_LEN];
int res;
coap_pkt_t pdu;
_req_ctx_t req_ctx = {
.resp_wait = MUTEX_INIT,
@ -598,6 +612,9 @@ static int _dns_query(const char *domain_name, _req_ctx_t *req_ctx)
domain_name,
req_ctx->family
);
#if IS_USED(MODULE_DNS_CACHE)
req_ctx->domain_name = domain_name;
#endif
#if IS_USED(MODULE_GCOAP_DTLS)
req_ctx->req_tag = _req_tag++;
#endif
@ -611,6 +628,16 @@ static int _dns_query(const char *domain_name, _req_ctx_t *req_ctx)
return res;
}
static const char *_domain_name_from_ctx(_req_ctx_t *context)
{
#if IS_USED(MODULE_DNS_CACHE)
return context->domain_name;
#else
(void)context;
return NULL;
#endif
}
static void _resp_handler(const gcoap_request_memo_t *memo, coap_pkt_t *pdu,
const sock_udp_ep_t *remote)
{
@ -710,14 +737,20 @@ static void _resp_handler(const gcoap_request_memo_t *memo, coap_pkt_t *pdu,
}
switch (coap_get_content_type(pdu)) {
case COAP_FORMAT_DNS_MESSAGE:
case COAP_FORMAT_NONE:
case COAP_FORMAT_NONE: {
uint32_t ttl;
context->res = dns_msg_parse_reply(data, data_len, family,
context->addr_out, NULL);
if ((ENABLE_DEBUG) && (context->res < 0)) {
context->addr_out, &ttl);
if (context->res > 0) {
dns_cache_add(_domain_name_from_ctx(context), context->addr_out, context->res, ttl);
}
else if (ENABLE_DEBUG && (context->res < 0)) {
DEBUG("gcoap_dns: Unable to parse DNS reply: %d\n",
context->res);
}
break;
}
default:
context->res = -ENOMSG;
break;