gcoap: add remote sock_udp_ep_t to coap_request_ctx_t

sys/include/net/nanocoap.h

@@ -96,6 +96,12 @@
 #include <arpa/inet.h>
 #endif
 
+#if defined(MODULE_SOCK_UDP) || defined(DOXYGEN)
+#include "net/sock/udp.h"
+#else
+typedef void sock_udp_ep_t;
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -347,6 +353,18 @@ void *coap_request_ctx_get_context(const coap_request_ctx_t *ctx);
  */
 uint32_t coap_request_ctx_get_tl_type(const coap_request_ctx_t *ctx);
 
+/**
+ * @brief   Get the remote endpoint from which the request was received
+ *
+ * @note    This is currently only implemented for GCoAP
+ *
+ * @param[in]   ctx The request context
+ *
+ * @return  Remote endpoint from which the request originated
+ * @return  NULL    The request was not received via UDP
+ */
+const sock_udp_ep_t *coap_request_ctx_get_remote_udp(const coap_request_ctx_t *ctx);
+
 /**
  * @brief   Block1 helper struct
  */

sys/net/application_layer/gcoap/gcoap.c

@@ -711,6 +711,7 @@ static size_t _handle_req(gcoap_socket_t *sock, coap_pkt_t *pdu, uint8_t *buf,
     coap_request_ctx_t ctx = {
         .resource = resource,
         .tl_type = (uint32_t)sock->type,
+        .remote = remote,
     };
 
     if (coap_get_proxy_uri(pdu, &offset) > 0) {

sys/net/application_layer/nanocoap/nanocoap.c

@@ -1256,3 +1256,13 @@ uint32_t coap_request_ctx_get_tl_type(const coap_request_ctx_t *ctx)
     return 0;
 #endif
 }
+
+const sock_udp_ep_t *coap_request_ctx_get_remote_udp(const coap_request_ctx_t *ctx)
+{
+#ifdef MODULE_GCOAP
+    return ctx->remote;
+#else
+    (void)ctx;
+    return NULL;
+#endif
+}

sys/net/application_layer/nanocoap/nanocoap_internal.h

@@ -20,6 +20,11 @@
 #define NANOCOAP_INTERNAL_H
 
 #include "net/nanocoap.h"
+#if defined(MODULE_SOCK_UDP) || defined(DOXYGEN)
+#include "net/sock/udp.h"
+#else
+typedef void sock_udp_ep_t;
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -40,6 +45,7 @@ struct _coap_request_ctx {
      *          cyclically include the @ref net_gcoap header.
      */
     uint32_t tl_type;
+    sock_udp_ep_t *remote;              /**< remote endpoint of the request */
 #endif
 };