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* Copyright (c) 2017 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#if 1
#define SYS_LOG_DOMAIN "dns-res"
#define NET_SYS_LOG_LEVEL SYS_LOG_LEVEL_DEBUG
#define NET_LOG_ENABLED 1
#endif
#include <zephyr.h>
#include <sections.h>
#include <errno.h>
#include <stdio.h>
#include <net/net_core.h>
#include <net/net_if.h>
#include <net/net_mgmt.h>
#include <net/dns_resolve.h>
#define STACKSIZE 2000
char __noinit __stack thread_stack[STACKSIZE];
static struct k_thread thread_data;
#define DNS_TIMEOUT 2000 /* ms */
void dns_result_cb(enum dns_resolve_status status,
struct dns_addrinfo *info,
void *user_data)
{
char hr_addr[NET_IPV6_ADDR_LEN];
char *hr_family;
void *addr;
switch (status) {
case DNS_EAI_CANCELED:
NET_INFO("DNS query was canceled");
return;
case DNS_EAI_FAIL:
NET_INFO("DNS resolve failed");
return;
case DNS_EAI_NODATA:
NET_INFO("Cannot resolve address");
return;
case DNS_EAI_ALLDONE:
NET_INFO("DNS resolving finished");
return;
case DNS_EAI_INPROGRESS:
break;
default:
NET_INFO("DNS resolving error (%d)", status);
return;
}
if (!info) {
return;
}
if (info->ai_family == AF_INET) {
hr_family = "IPv4";
addr = &net_sin(&info->ai_addr)->sin_addr;
} else if (info->ai_family == AF_INET6) {
hr_family = "IPv6";
addr = &net_sin6(&info->ai_addr)->sin6_addr;
} else {
NET_ERR("Invalid IP address family %d", info->ai_family);
return;
}
NET_INFO("%s address: %s", hr_family,
net_addr_ntop(info->ai_family, addr,
hr_addr, sizeof(hr_addr)));
}
#if defined(CONFIG_NET_DHCPV4)
static struct net_mgmt_event_callback mgmt4_cb;
static struct k_delayed_work ipv4_timer;
static void do_ipv4_lookup(struct k_work *work)
{
u16_t dns_id;
int ret;
ret = dns_get_addr_info("www.zephyrproject.org",
DNS_QUERY_TYPE_A,
&dns_id,
dns_result_cb,
NULL,
DNS_TIMEOUT);
if (ret < 0) {
NET_ERR("Cannot resolve IPv4 address (%d)", ret);
return;
}
NET_DBG("DNS id %u", dns_id);
}
static void ipv4_addr_add_handler(struct net_mgmt_event_callback *cb,
u32_t mgmt_event,
struct net_if *iface)
{
char hr_addr[NET_IPV4_ADDR_LEN];
int i;
if (mgmt_event != NET_EVENT_IPV4_ADDR_ADD) {
return;
}
for (i = 0; i < NET_IF_MAX_IPV4_ADDR; i++) {
struct net_if_addr *if_addr = &iface->ipv4.unicast[i];
if (if_addr->addr_type != NET_ADDR_DHCP || !if_addr->is_used) {
continue;
}
NET_INFO("IPv4 address: %s",
net_addr_ntop(AF_INET, &if_addr->address.in_addr,
hr_addr, NET_IPV4_ADDR_LEN));
NET_INFO("Lease time: %u seconds", iface->dhcpv4.lease_time);
NET_INFO("Subnet: %s",
net_addr_ntop(AF_INET, &iface->ipv4.netmask,
hr_addr, NET_IPV4_ADDR_LEN));
NET_INFO("Router: %s",
net_addr_ntop(AF_INET, &iface->ipv4.gw,
hr_addr, NET_IPV4_ADDR_LEN));
break;
}
/* We cannot run DNS lookup directly from this thread as the
* management event thread stack is very small by default.
* So run it from work queue instead.
*/
k_delayed_work_init(&ipv4_timer, do_ipv4_lookup);
k_delayed_work_submit(&ipv4_timer, 0);
}
static void setup_dhcpv4(struct net_if *iface)
{
NET_INFO("Getting IPv4 address via DHCP before issuing DNS query");
net_mgmt_init_event_callback(&mgmt4_cb, ipv4_addr_add_handler,
NET_EVENT_IPV4_ADDR_ADD);
net_mgmt_add_event_callback(&mgmt4_cb);
net_dhcpv4_start(iface);
}
#else
#define setup_dhcpv4(...)
#endif /* CONFIG_NET_DHCPV4 */
#if defined(CONFIG_NET_IPV4) && !defined(CONFIG_NET_DHCPV4)
#if !defined(CONFIG_NET_APP_MY_IPV4_ADDR)
#error "You need to define an IPv4 address or enable DHCPv4!"
#endif
static void setup_ipv4(struct net_if *iface)
{
char hr_addr[NET_IPV4_ADDR_LEN];
struct in_addr addr;
u16_t dns_id;
int ret;
if (net_addr_pton(AF_INET, CONFIG_NET_APP_MY_IPV4_ADDR, &addr)) {
NET_ERR("Invalid address: %s", CONFIG_NET_APP_MY_IPV4_ADDR);
return;
}
net_if_ipv4_addr_add(iface, &addr, NET_ADDR_MANUAL, 0);
NET_INFO("IPv4 address: %s",
net_addr_ntop(AF_INET, &addr, hr_addr, NET_IPV4_ADDR_LEN));
ret = dns_get_addr_info("www.zephyrproject.org",
DNS_QUERY_TYPE_A,
&dns_id,
dns_result_cb,
NULL,
DNS_TIMEOUT);
if (ret < 0) {
NET_ERR("Cannot resolve IPv4 address (%d)", ret);
return;
}
NET_DBG("DNS id %u", dns_id);
}
#else
#define setup_ipv4(...)
#endif /* CONFIG_NET_IPV4 && !CONFIG_NET_DHCPV4 */
#if defined(CONFIG_NET_IPV6)
#if !defined(CONFIG_NET_APP_MY_IPV6_ADDR)
#error "You need to define an IPv6 address!"
#endif
static struct net_mgmt_event_callback mgmt6_cb;
static struct k_delayed_work ipv6_timer;
static void do_ipv6_lookup(struct k_work *work)
{
u16_t dns_id;
int ret;
ret = dns_get_addr_info("www.zephyrproject.org",
DNS_QUERY_TYPE_AAAA,
&dns_id,
dns_result_cb,
NULL,
DNS_TIMEOUT);
if (ret < 0) {
NET_ERR("Cannot resolve IPv6 address (%d)", ret);
return;
}
NET_DBG("DNS id %u", dns_id);
}
/* DNS query will most probably fail if we do not have a default
* router configured because typically the DNS server is outside of local
* network. So wait for that before continuing.
*/
static void ipv6_router_add_handler(struct net_mgmt_event_callback *cb,
u32_t mgmt_event,
struct net_if *iface)
{
if (mgmt_event != NET_EVENT_IPV6_ROUTER_ADD) {
return;
}
/* We cannot run DNS lookup directly from this thread as the
* management event thread stack is very small by default.
* So run it from work queue instead.
*/
k_delayed_work_init(&ipv6_timer, do_ipv6_lookup);
k_delayed_work_submit(&ipv6_timer, 0);
}
static void setup_ipv6(struct net_if *iface)
{
char hr_addr[NET_IPV6_ADDR_LEN];
struct in6_addr addr;
if (net_addr_pton(AF_INET6, CONFIG_NET_APP_MY_IPV6_ADDR, &addr)) {
NET_ERR("Invalid address: %s", CONFIG_NET_APP_MY_IPV6_ADDR);
return;
}
net_mgmt_init_event_callback(&mgmt6_cb, ipv6_router_add_handler,
NET_EVENT_IPV6_ROUTER_ADD);
net_mgmt_add_event_callback(&mgmt6_cb);
net_if_ipv6_addr_add(iface, &addr, NET_ADDR_MANUAL, 0);
NET_INFO("IPv6 address: %s",
net_addr_ntop(AF_INET6, &addr, hr_addr, NET_IPV6_ADDR_LEN));
NET_INFO("Waiting for IPv6 default router notification "
"before issuing DNS query");
}
#else
#define setup_ipv6(...)
#endif /* CONFIG_NET_IPV6 */
static void network_setup(void)
{
struct net_if *iface = net_if_get_default();
setup_ipv4(iface);
setup_dhcpv4(iface);
setup_ipv6(iface);
}
void main(void)
{
NET_INFO("Starting DNS resolve sample");
k_thread_create(&thread_data, thread_stack, STACKSIZE,
(k_thread_entry_t)network_setup,
NULL, NULL, NULL, K_PRIO_COOP(7), 0, 0);
}
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