mirror of
https://github.com/espressif/esp-idf.git
synced 2024-09-20 10:46:02 -04:00
108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_openthread_dns64.h"
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#include "esp_check.h"
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#include "esp_event.h"
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#include "esp_log.h"
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#include "openthread/instance.h"
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#include "openthread/netdata.h"
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#include "lwip_default_hooks.h"
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#include "lwip/api.h"
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#include "lwip/dns.h"
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#define TAG "OT_DNS64"
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// The network data change callback sets the dns server address of index 0, while the CLI sets the dns server address of index 1.
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#define OPENTHREAD_DNS_SERVER_INDEX 0
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static void esp_openthread_netdata_change_callback(otChangedFlags changed_flags, void *ctx)
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{
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if (OT_CHANGED_THREAD_NETDATA & changed_flags) {
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ip_addr_t dns_server_addr = *IP_ADDR_ANY;
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if (esp_openthread_get_nat64_prefix(&dns_server_addr.u_addr.ip6) == ESP_OK) {
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dns_server_addr.type = IPADDR_TYPE_V6;
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dns_server_addr.u_addr.ip6.addr[3] = ipaddr_addr(CONFIG_OPENTHREAD_DNS_SERVER_ADDR);
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const ip_addr_t *dnsserver = dns_getserver(OPENTHREAD_DNS_SERVER_INDEX);
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if (memcmp(dnsserver, &dns_server_addr, sizeof(ip_addr_t)) != 0) {
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ESP_LOGI(TAG, "Set dns server address: %s", ipaddr_ntoa(&dns_server_addr));
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dns_setserver(OPENTHREAD_DNS_SERVER_INDEX, &dns_server_addr);
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if (esp_event_post(OPENTHREAD_EVENT, OPENTHREAD_EVENT_SET_DNS_SERVER, NULL, 0, 0) != ESP_OK) {
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ESP_LOGE(TAG, "Failed to post OpenThread set DNS server event");
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}
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}
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}
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}
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}
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esp_err_t esp_openthread_dns64_client_init(void)
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{
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otInstance *instance = esp_openthread_get_instance();
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ESP_RETURN_ON_FALSE(otSetStateChangedCallback(instance, esp_openthread_netdata_change_callback, NULL) ==
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OT_ERROR_NONE,
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ESP_FAIL, TAG, "Failed to install network data change callback");
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dns_setserver(OPENTHREAD_DNS_SERVER_INDEX, NULL);
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return ESP_OK;
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}
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esp_err_t esp_openthread_get_dnsserver_addr(ip6_addr_t *dnsserver_addr)
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{
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const ip_addr_t *dnsserver = dns_getserver(OPENTHREAD_DNS_SERVER_INDEX);
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ESP_RETURN_ON_FALSE(dnsserver_addr, ESP_ERR_INVALID_ARG, TAG, "dnsserver_addr cannot be NULL");
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ESP_RETURN_ON_FALSE(!ip_addr_isany(dnsserver), ESP_ERR_INVALID_STATE, TAG,
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"DNS server address is not set");
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memcpy(dnsserver_addr, &dnsserver->u_addr.ip6, sizeof(ip6_addr_t));
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return ESP_OK;
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}
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esp_err_t esp_openthread_get_nat64_prefix(ip6_addr_t *nat64_prefix)
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{
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otNetworkDataIterator iter = OT_NETWORK_DATA_ITERATOR_INIT;
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otInstance *instance = esp_openthread_get_instance();
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otExternalRouteConfig route;
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memset(&route, 0, sizeof(route));
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while (otNetDataGetNextRoute(instance, &iter, &route) == OT_ERROR_NONE) {
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if (route.mNat64) {
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break;
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}
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}
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if (route.mNat64) {
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memcpy(nat64_prefix->addr, route.mPrefix.mPrefix.mFields.m8, sizeof(nat64_prefix->addr));
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return ESP_OK;
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} else {
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return ESP_ERR_NOT_FOUND;
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}
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}
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int lwip_hook_netconn_external_resolve(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err)
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{
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if (addrtype == NETCONN_DNS_IPV4) {
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return 0;
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}
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ip6_addr_t nat64_prefix;
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if (esp_openthread_get_nat64_prefix(&nat64_prefix) != ESP_OK) {
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ESP_LOGE(TAG, "Cannot find NAT64 prefix\n");
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*err = ERR_ABRT;
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return 1;
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}
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*err = netconn_gethostbyname_addrtype(name, addr, NETCONN_DNS_IPV4);
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if (*err != ERR_OK) {
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return 1;
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}
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if (addr->type == IPADDR_TYPE_V4) {
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ip4_addr_t addr_copy = addr->u_addr.ip4;
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addr->type = IPADDR_TYPE_V6;
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memcpy(addr->u_addr.ip6.addr, nat64_prefix.addr, sizeof(nat64_prefix.addr));
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addr->u_addr.ip6.addr[3] = addr_copy.addr;
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addr->u_addr.ip6.zone = IP6_NO_ZONE;
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}
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return 1;
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}
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