eth conn: get interface mac

include/neuron/connection/neu_connection_eth.h

@@ -31,6 +31,7 @@ typedef struct neu_conn_eth neu_conn_eth_t;
 neu_conn_eth_t *neu_conn_eth_init(const char *interface, void *ctx);
 int             neu_conn_eth_uninit(neu_conn_eth_t *conn);
 int             neu_conn_eth_check_interface(const char *interface);
+void            neu_conn_eth_get_mac(neu_conn_eth_t *conn, uint8_t *mac);
 
 typedef void (*neu_conn_eth_msg_callback)(neu_conn_eth_t *conn, void *ctx,
                                           uint16_t protocol, uint16_t n_byte,

src/connection/connection_eth.c

@@ -193,6 +193,11 @@ int neu_conn_eth_uninit(neu_conn_eth_t *conn)
     return 0;
 }
 
+void neu_conn_eth_get_mac(neu_conn_eth_t *conn, uint8_t *mac)
+{
+    memcpy(mac, conn->ic->mac, ETH_ALEN);
+}
+
 int neu_conn_eth_check_interface(const char *interface)
 {
     struct ifreq ifr = { 0 };