[net][lwip] fix lwip netdev DNS address setup error

Signed-off-by: chenyong <1521761801@qq.com>

components/net/lwip-1.4.1/src/core/dns.c

@@ -279,11 +279,14 @@ dns_setserver(u8_t numdns, ip_addr_t *dnsserver)
     dns_servers[numdns] = (*dnsserver);
     
 #ifdef RT_USING_NETDEV
-      extern struct netdev *netdev_default;
+      extern struct netif *netif_default;
+      extern struct netdev *netdev_get_by_name(const char *name);
       extern void netdev_low_level_set_dns_server(struct netdev *netdev, uint8_t dns_num, const ip_addr_t *dns_server);
 
       /* set network interface device DNS server address */
-      netdev_low_level_set_dns_server(netdev_default, numdns, dnsserver);
+      if (netif_default) {
+        netdev_low_level_set_dns_server(netdev_get_by_name(netif_default->name), numdns, dnsserver);
+      }
 #endif /* RT_USING_NETDEV */
   }
 }

components/net/lwip-1.4.1/src/netif/ethernetif.c

@@ -99,6 +99,7 @@ static char eth_rx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
 
 #ifdef RT_USING_NETDEV
 
+#include "lwip/ip.h"
 #include "lwip/init.h"
 #include "lwip/netdb.h"
 #include <netdev.h>

components/net/lwip-2.0.2/src/core/dns.c

@@ -370,11 +370,14 @@ dns_setserver(u8_t numdns, const ip_addr_t *dnsserver)
       dns_servers[numdns] = (*dnsserver);
         
 #ifdef RT_USING_NETDEV
-      extern struct netdev *netdev_default;
+      extern struct netif *netif_default;
+      extern struct netdev *netdev_get_by_name(const char *name);
       extern void netdev_low_level_set_dns_server(struct netdev *netdev, uint8_t dns_num, const ip_addr_t *dns_server);
 
       /* set network interface device DNS server address */
-      netdev_low_level_set_dns_server(netdev_default, numdns, dnsserver);
+      if (netif_default) {
+        netdev_low_level_set_dns_server(netdev_get_by_name(netif_default->name), numdns, dnsserver);
+      }
 #endif /* RT_USING_NETDEV */
     } else {
       dns_servers[numdns] = *IP_ADDR_ANY;

components/net/lwip-2.0.2/src/netif/ethernetif.c

@@ -107,6 +107,7 @@ static char eth_rx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
 
 #ifdef RT_USING_NETDEV
 
+#include "lwip/ip.h"
 #include "lwip/init.h"
 #include "lwip/netdb.h"
 #include <netdev.h>

components/net/lwip-2.1.0/src/core/dns.c

@@ -367,11 +367,14 @@ dns_setserver(u8_t numdns, const ip_addr_t *dnsserver)
       dns_servers[numdns] = (*dnsserver);
 
 #ifdef RT_USING_NETDEV
-      extern struct netdev *netdev_default;
+      extern struct netif *netif_default;
+      extern struct netdev *netdev_get_by_name(const char *name);
       extern void netdev_low_level_set_dns_server(struct netdev *netdev, uint8_t dns_num, const ip_addr_t *dns_server);
 
       /* set network interface device DNS server address */
-      netdev_low_level_set_dns_server(netdev_default, numdns, dnsserver);
+      if (netif_default) {
+        netdev_low_level_set_dns_server(netdev_get_by_name(netif_default->name), numdns, dnsserver);
+      }
 #endif /* RT_USING_NETDEV */
     } else {
       dns_servers[numdns] = *IP_ADDR_ANY;

components/net/lwip-2.1.0/src/netif/ethernetif.c

@@ -108,6 +108,7 @@ static char eth_rx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
 
 #ifdef RT_USING_NETDEV
 
+#include "lwip/ip.h"
 #include "lwip/init.h"
 #include "lwip/netdb.h"
 #include <netdev.h>