net/sock_udp: add sock_udp_ep_equal()

sys/include/net/sock/util.h

 /*
  * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ *               2018 Freie Universität Berlin
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -15,19 +16,23 @@
  * @{
  *
  * @file
- * @brief   sock utility function definitions
+ * @brief       sock utility function definitions
  *
- * @author  Kaspar Schleiser <kaspar@schleiser.de>
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  */
 
 #ifndef NET_SOCK_UTIL_H
 #define NET_SOCK_UTIL_H
 
+#include <stdbool.h>
+
+#include "net/sock/udp.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-
 /**
  * @brief   Format UDP endpoint to string and port
  *
@@ -73,6 +78,21 @@ int sock_urlsplit(const char *url, char *hostport, char *urlpath);
  */
 int sock_udp_str2ep(sock_udp_ep_t *ep_out, const char *str);
 
+/**
+ * @brief   Compare the two given UDP endpoints
+ *
+ * The given endpoint identifiers are compared by checking their address family,
+ * their addresses, and their port value.
+ *
+ * @param[in] a     Endpoint A
+ * @param[in] b     Endpoint B
+ *
+ * @return  true if given endpoint identifiers point to the same destination
+ * @return  false if given endpoint identifiers do not point to the same
+ *          destination, or if the address family is unknown
+ */
+bool sock_udp_ep_equal(const sock_udp_ep_t *a, const sock_udp_ep_t *b);
+
 /**
  * @name helper definitions
  * @{

sys/net/sock/sock_util.c

 /*
  * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ *               2018 Freie Universität Berlin
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -7,11 +8,14 @@
  */
 
 /**
- * @ingroup net_sock_util
+ * @ingroup     net_sock_util
  * @{
+ *
  * @file
- * @brief   sock utility functions implementation
- * @author  Kaspar Schleiser <kaspar@schleiser.de>
+ * @brief       sock utility functions implementation
+ *
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
  * @}
  */
 
@@ -181,3 +185,26 @@ int sock_udp_str2ep(sock_udp_ep_t *ep_out, const char *str)
 #endif
     return -EINVAL;
 }
+
+bool sock_udp_ep_equal(const sock_udp_ep_t *a, const sock_udp_ep_t *b)
+{
+    assert(a && b);
+
+    /* compare family and port */
+    if ((a->family != b->family) || (a->port != b->port)) {
+        return false;
+    }
+
+    /* compare addresses */
+    switch (a->family) {
+#ifdef SOCK_HAS_IPV6
+        case AF_INET6:
+            return (memcmp(a->addr.ipv6, b->addr.ipv6, 16) == 0);
+
+#endif
+        case AF_INET:
+            return (memcmp(a->addr.ipv4, b->addr.ipv4, 4) == 0);
+        default:
+            return false;
+    }
+}