New DNS implementation.

src/base/kernel/interfaces/IDnsBackend.h

@@ -0,0 +1,54 @@
+/* XMRig
+ * Copyright (c) 2018-2021 SChernykh   <https://github.com/SChernykh>
+ * Copyright (c) 2016-2021 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef XMRIG_IDNSBACKEND_H
+#define XMRIG_IDNSBACKEND_H
+
+
+#include "base/tools/Object.h"
+
+
+#include <memory>
+
+
+namespace xmrig {
+
+
+class DnsRecords;
+class DnsRequest;
+class IDnsListener;
+class String;
+
+
+class IDnsBackend
+{
+public:
+    XMRIG_DISABLE_COPY_MOVE(IDnsBackend)
+
+    IDnsBackend()           = default;
+    virtual ~IDnsBackend()  = default;
+
+    virtual const DnsRecords &records() const                                                               = 0;
+    virtual std::shared_ptr<DnsRequest> resolve(const String &host, IDnsListener *listener, uint64_t ttl)   = 0;
+};
+
+
+} /* namespace xmrig */
+
+
+#endif // XMRIG_IDNSBACKEND_H

src/base/kernel/interfaces/IDnsListener.h

@@ -37,7 +37,7 @@ public:
     IDnsListener()          = default;
     virtual ~IDnsListener() = default;
 
-    virtual void onResolved(const DnsRecords &records, int status) = 0;
+    virtual void onResolved(const DnsRecords &records, int status, const char *error)   = 0;
 };