148 lines
3.3 KiB
C++
148 lines
3.3 KiB
C++
/* XMRig
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* Copyright (c) 2018-2023 SChernykh <https://github.com/SChernykh>
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* Copyright (c) 2016-2023 XMRig <https://github.com/xmrig>, <support@xmrig.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <uv.h>
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#include "base/net/dns/DnsUvBackend.h"
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#include "base/kernel/interfaces/IDnsListener.h"
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#include "base/net/dns/DnsRequest.h"
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#include "base/tools/Chrono.h"
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namespace xmrig {
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static Storage<DnsUvBackend> *storage = nullptr;
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Storage<DnsUvBackend> &DnsUvBackend::getStorage()
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{
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if (storage == nullptr) {
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storage = new Storage<DnsUvBackend>();
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}
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return *storage;
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}
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static addrinfo hints{};
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} // namespace xmrig
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xmrig::DnsUvBackend::DnsUvBackend()
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{
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if (!hints.ai_protocol) {
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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}
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m_key = getStorage().add(this);
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}
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xmrig::DnsUvBackend::~DnsUvBackend()
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{
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assert(storage);
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storage->release(m_key);
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if (storage->isEmpty()) {
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delete storage;
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storage = nullptr;
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}
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}
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std::shared_ptr<xmrig::DnsRequest> xmrig::DnsUvBackend::resolve(const String &host, IDnsListener *listener, uint64_t ttl)
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{
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auto req = std::make_shared<DnsRequest>(listener);
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if (Chrono::currentMSecsSinceEpoch() - m_ts <= ttl && !m_records.isEmpty()) {
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req->listener->onResolved(m_records, 0, nullptr);
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} else {
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m_queue.emplace(req);
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}
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if (m_queue.size() == 1 && !resolve(host)) {
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done();
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}
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return req;
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}
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bool xmrig::DnsUvBackend::resolve(const String &host)
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{
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m_req = std::make_shared<uv_getaddrinfo_t>();
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m_req->data = getStorage().ptr(m_key);
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m_status = uv_getaddrinfo(uv_default_loop(), m_req.get(), DnsUvBackend::onResolved, host.data(), nullptr, &hints);
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return m_status == 0;
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}
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void xmrig::DnsUvBackend::done()
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{
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const char *error = m_status < 0 ? uv_strerror(m_status) : nullptr;
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while (!m_queue.empty()) {
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auto req = std::move(m_queue.front()).lock();
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if (req) {
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req->listener->onResolved(m_records, m_status, error);
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}
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m_queue.pop();
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}
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m_req.reset();
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}
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void xmrig::DnsUvBackend::onResolved(int status, addrinfo *res)
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{
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m_ts = Chrono::currentMSecsSinceEpoch();
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if ((m_status = status) < 0) {
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return done();
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}
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m_records.parse(res);
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if (m_records.isEmpty()) {
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m_status = UV_EAI_NONAME;
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}
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done();
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}
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void xmrig::DnsUvBackend::onResolved(uv_getaddrinfo_t *req, int status, addrinfo *res)
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{
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auto backend = getStorage().get(req->data);
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if (backend) {
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backend->onResolved(status, res);
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}
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uv_freeaddrinfo(res);
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}
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