add list_if() command in lwip

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@72 bbd45198-f89e-11dd-88c7-29a3b14d5316

net/lwip/src/netif/ethernetif.c

@@ -255,3 +255,25 @@ rt_err_t eth_system_device_init()
 
 	return result;
 }
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+void list_if()
+{
+	struct _ip_addr
+	{
+		rt_uint8_t addr0, addr1, addr2, addr3;
+	} *addr;
+
+	rt_kprintf("Default network interface: %c%c\n", netif_default->name[0], netif_default->name[1]);
+	addr = (struct _ip_addr*)&netif_default->ip_addr.addr;
+	rt_kprintf("ip address: %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+
+	addr = (struct _ip_addr*)&netif_default->gw.addr;
+	rt_kprintf("gw address: %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+
+	addr = (struct _ip_addr*)&netif_default->netmask.addr;
+	rt_kprintf("net mask  : %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+}
+FINSH_FUNCTION_EXPORT(list_if, list network interface information);
+#endif