Added socks proxy (tor/i2pd/kovri) support to wallet

src/net/socks_connect.h

@@ -0,0 +1,55 @@
+// Copyright (c) 2019, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/steady_timer.hpp>
+#include <boost/thread/future.hpp>
+#include <string>
+
+namespace net
+{
+namespace socks
+{
+    //! Primarily for use with `epee::net_utils::http_client`.
+    struct connector
+    {
+        boost::asio::ip::tcp::endpoint proxy_address;
+
+        /*! Creates a new socket, asynchronously connects to `proxy_address`,
+            and requests a connection to `remote_host` on `remote_port`. Sets
+            socket as closed if `timeout` is reached.
+
+            \return The socket if successful, and exception in the future with
+                error otherwise. */
+        boost::unique_future<boost::asio::ip::tcp::socket>
+            operator()(const std::string& remote_host, const std::string& remote_port, boost::asio::steady_timer& timeout) const;
+    };
+} // socks
+} // net