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* Copyright (c) 2017 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <logging/log.h>
LOG_MODULE_REGISTER(net_dns_resolve_client_sample, LOG_LEVEL_DBG);
#include <zephyr.h>
#include <linker/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>
#if defined(CONFIG_MDNS_RESOLVER)
#if defined(CONFIG_NET_IPV4)
static struct k_delayed_work mdns_ipv4_timer;
static void do_mdns_ipv4_lookup(struct k_work *work);
#endif
#if defined(CONFIG_NET_IPV6)
static struct k_delayed_work mdns_ipv6_timer;
static void do_mdns_ipv6_lookup(struct k_work *work);
#endif
#endif
#define DNS_TIMEOUT K_SECONDS(2)
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:
LOG_INF("DNS query was canceled");
return;
case DNS_EAI_FAIL:
LOG_INF("DNS resolve failed");
return;
case DNS_EAI_NODATA:
LOG_INF("Cannot resolve address");
return;
case DNS_EAI_ALLDONE:
LOG_INF("DNS resolving finished");
return;
case DNS_EAI_INPROGRESS:
break;
default:
LOG_INF("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;
#if defined(CONFIG_MDNS_RESOLVER) && defined(CONFIG_NET_IPV4)
k_delayed_work_init(&mdns_ipv4_timer, do_mdns_ipv4_lookup);
k_delayed_work_submit(&mdns_ipv4_timer, 0);
#endif
} else if (info->ai_family == AF_INET6) {
hr_family = "IPv6";
addr = &net_sin6(&info->ai_addr)->sin6_addr;
#if defined(CONFIG_MDNS_RESOLVER) && defined(CONFIG_NET_IPV6)
k_delayed_work_init(&mdns_ipv6_timer, do_mdns_ipv6_lookup);
k_delayed_work_submit(&mdns_ipv6_timer, 0);
#endif
} else {
LOG_ERR("Invalid IP address family %d", info->ai_family);
return;
}
LOG_INF("%s %s address: %s", user_data ? (char *)user_data : "<null>",
hr_family,
log_strdup(net_addr_ntop(info->ai_family, addr,
hr_addr, sizeof(hr_addr))));
}
void mdns_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:
LOG_INF("DNS query was canceled");
return;
case DNS_EAI_FAIL:
LOG_INF("DNS resolve failed");
return;
case DNS_EAI_NODATA:
LOG_INF("Cannot resolve address");
return;
case DNS_EAI_ALLDONE:
LOG_INF("DNS resolving finished");
return;
case DNS_EAI_INPROGRESS:
break;
default:
LOG_INF("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 {
LOG_ERR("Invalid IP address family %d", info->ai_family);
return;
}
LOG_INF("%s %s address: %s", user_data ? (char *)user_data : "<null>",
hr_family,
log_strdup(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)
{
static const char *query = "www.zephyrproject.org";
u16_t dns_id;
int ret;
ret = dns_get_addr_info(query,
DNS_QUERY_TYPE_A,
&dns_id,
dns_result_cb,
(void *)query,
DNS_TIMEOUT);
if (ret < 0) {
LOG_ERR("Cannot resolve IPv4 address (%d)", ret);
return;
}
LOG_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->config.ip.ipv4->unicast[i];
if (if_addr->addr_type != NET_ADDR_DHCP || !if_addr->is_used) {
continue;
}
LOG_INF("IPv4 address: %s",
log_strdup(net_addr_ntop(AF_INET,
&if_addr->address.in_addr,
hr_addr, NET_IPV4_ADDR_LEN)));
LOG_INF("Lease time: %u seconds",
iface->config.dhcpv4.lease_time);
LOG_INF("Subnet: %s",
log_strdup(net_addr_ntop(AF_INET,
&iface->config.ip.ipv4->netmask,
hr_addr, NET_IPV4_ADDR_LEN)));
LOG_INF("Router: %s",
log_strdup(net_addr_ntop(AF_INET,
&iface->config.ip.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)
{
LOG_INF("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_MDNS_RESOLVER)
static void do_mdns_ipv4_lookup(struct k_work *work)
{
static const char *query = "zephyr.local";
u16_t dns_id;
int ret;
LOG_DBG("Doing mDNS IPv4 query");
ret = dns_get_addr_info(query,
DNS_QUERY_TYPE_A,
&dns_id,
mdns_result_cb,
(void *)query,
DNS_TIMEOUT);
if (ret < 0) {
LOG_ERR("Cannot resolve mDNS IPv4 address (%d)", ret);
return;
}
LOG_DBG("mDNS id %u", dns_id);
}
#endif
#endif
#if defined(CONFIG_NET_IPV4) && !defined(CONFIG_NET_DHCPV4)
#if !defined(CONFIG_NET_CONFIG_MY_IPV4_ADDR)
#error "You need to define an IPv4 address or enable DHCPv4!"
#endif
static void setup_ipv4(struct net_if *iface)
{
static const char *query = "www.zephyrproject.org";
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_CONFIG_MY_IPV4_ADDR, &addr)) {
LOG_ERR("Invalid address: %s", CONFIG_NET_CONFIG_MY_IPV4_ADDR);
return;
}
net_if_ipv4_addr_add(iface, &addr, NET_ADDR_MANUAL, 0);
LOG_INF("IPv4 address: %s",
log_strdup(net_addr_ntop(AF_INET, &addr, hr_addr,
NET_IPV4_ADDR_LEN)));
ret = dns_get_addr_info(query,
DNS_QUERY_TYPE_A,
&dns_id,
dns_result_cb,
(void *)query,
DNS_TIMEOUT);
if (ret < 0) {
LOG_ERR("Cannot resolve IPv4 address (%d)", ret);
return;
}
LOG_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_CONFIG_MY_IPV6_ADDR)
#error "You need to define an IPv6 address!"
#endif
static void do_ipv6_lookup(void)
{
static const char *query = "www.zephyrproject.org";
u16_t dns_id;
int ret;
ret = dns_get_addr_info(query,
DNS_QUERY_TYPE_AAAA,
&dns_id,
dns_result_cb,
(void *)query,
DNS_TIMEOUT);
if (ret < 0) {
LOG_ERR("Cannot resolve IPv6 address (%d)", ret);
return;
}
LOG_DBG("DNS id %u", dns_id);
}
static void setup_ipv6(struct net_if *iface)
{
do_ipv6_lookup();
}
#if defined(CONFIG_MDNS_RESOLVER)
static void do_mdns_ipv6_lookup(struct k_work *work)
{
static const char *query = "zephyr.local";
u16_t dns_id;
int ret;
LOG_DBG("Doing mDNS IPv6 query");
ret = dns_get_addr_info(query,
DNS_QUERY_TYPE_AAAA,
&dns_id,
mdns_result_cb,
(void *)query,
DNS_TIMEOUT);
if (ret < 0) {
LOG_ERR("Cannot resolve mDNS IPv6 address (%d)", ret);
return;
}
LOG_DBG("mDNS id %u", dns_id);
}
#endif
#else
#define setup_ipv6(...)
#endif /* CONFIG_NET_IPV6 */
void main(void)
{
struct net_if *iface = net_if_get_default();
LOG_INF("Starting DNS resolve sample");
setup_ipv4(iface);
setup_dhcpv4(iface);
setup_ipv6(iface);
}
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