Function test_netdev_dns

components/net/utest/tc_netdev.c:179–221

* @brief Test DNS server configuration and hostname resolution * * This function tests: * - Setting incorrect DNS server and verifying hostname resolution fails * - Setting correct DNS server and verifying hostname resolution succeeds * - DNS server configuration operations * * @note DNS configuration will be restored in utest_tc_cleanup */

 * @note DNS configuration will be restored in utest_tc_cleanup
 */
static void test_netdev_dns(void)
{
#define UTEST_DNS               "114.114.114.114"   /* Valid DNS server */
#define UTEST_WRONG_DNS         "13.19.123.143"     /* Invalid DNS server */
#define UTEST_WRONG_HOST_NAME   "www.abcde.com"     /* Test hostname */
#define UTEST_HOST_ADDR         "www.rt-thread.org" /* RT-Thread official website */

    ip_addr_t ipaddr = {0};
    struct hostent *res = RT_NULL;
    struct sal_proto_family *netdev_inet = RT_NULL;

    /* Get SAL protocol family for DNS operations */
    netdev_inet = netdev_default->sal_user_data;
    if (netdev_inet == RT_NULL)
    {
        rt_kprintf("get sal proto family fail!");
        uassert_true(RT_FALSE);
        return;
    }

    /* Test with wrong DNS server - hostname resolution should fail */
    inet_aton(UTEST_WRONG_DNS, &ipaddr);
    netdev_default->ops->set_dns_server(netdev_default, 0, &ipaddr);
    netdev_default->ops->set_dns_server(netdev_default, 1, &ipaddr);
    res = netdev_inet->netdb_ops->gethostbyname(UTEST_WRONG_HOST_NAME);
    if (res == RT_NULL)
    {
        uassert_true(RT_TRUE);  /* Expected failure */
    }
    else
    {
        uassert_true(RT_FALSE); /* Unexpected success */
    }

    /* Test with correct DNS server - hostname resolution should succeed */
    inet_aton(UTEST_DNS, &ipaddr);
    netdev_default->ops->set_dns_server(netdev_default, 0, &ipaddr);
    netdev_default->ops->set_dns_server(netdev_default, 1, &ipaddr);
    res = netdev_inet->netdb_ops->gethostbyname(UTEST_HOST_ADDR);
    uassert_true(res != RT_NULL);

    /* DNS will be restored in utest_tc_cleanup */
}

/**
 * @brief Test DHCP functionality