Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2019 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_CLIENT_ASYNC_RESOLVE_GENERIC_H
+#define OPENVPN_CLIENT_ASYNC_RESOLVE_GENERIC_H
+
+#include <openvpn/common/bigmutex.hpp>
+#include <openvpn/common/rc.hpp>
+#include <openvpn/common/hostport.hpp>
+
+
+namespace openvpn {
+  template<typename RESOLVER_TYPE>
+  class AsyncResolvable: public virtual RC<thread_unsafe_refcount>
+  {
+  private:
+    typedef RCPtr<AsyncResolvable> Ptr;
+
+    openvpn_io::io_context& io_context;
+    RESOLVER_TYPE resolver;
+
+  public:
+    AsyncResolvable(openvpn_io::io_context& io_context_arg)
+      : io_context(io_context_arg),
+        resolver(io_context_arg)
+    {
+    }
+
+    virtual void resolve_callback(const openvpn_io::error_code& error,
+				  typename RESOLVER_TYPE::results_type results) = 0;
+
+    // This implementation assumes that the i/o reactor provides an asynchronous
+    // DNS resolution routine using its own primitives and that doesn't require
+    // us to take care of any non-interruptible opration (i.e. getaddrinfo() in
+    // case of ASIO).
+    //
+    // For example, iOS implements aync_resolve using GCD and CFHost. This
+    // implementation satisfies the constraints mentioned above
+    void async_resolve_name(const std::string& host, const std::string& port)
+    {
+	resolver.async_resolve(host, port, [self=Ptr(this)](const openvpn_io::error_code& error,
+							    typename RESOLVER_TYPE::results_type results)
+	{
+	  OPENVPN_ASYNC_HANDLER;
+	  self->resolve_callback(error, results);
+	});
+    }
+
+    // no-op: needed to provide the same class signature of the ASIO version
+    void async_resolve_lock()
+    {
+    }
+
+    void async_resolve_cancel()
+    {
+      resolver.cancel();
+    }
+  };
+}
+
+#endif /* OPENVPN_CLIENT_ASYNC_RESOLVE_GENERIC_H */