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84 lines
2.7 KiB
84 lines
2.7 KiB
#include "net/net_helper.h"
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namespace epee
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{
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namespace net_utils
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{
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boost::unique_future<boost::asio::ip::tcp::socket>
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direct_connect::operator()(const std::string& addr, const std::string& port, boost::asio::steady_timer& timeout) const
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{
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// Get a list of endpoints corresponding to the server name.
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//////////////////////////////////////////////////////////////////////////
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boost::asio::ip::tcp::resolver resolver(GET_IO_SERVICE(timeout));
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boost::asio::ip::tcp::resolver::query query(boost::asio::ip::tcp::v4(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
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bool try_ipv6 = false;
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boost::asio::ip::tcp::resolver::iterator iterator;
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boost::asio::ip::tcp::resolver::iterator end;
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boost::system::error_code resolve_error;
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try
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{
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iterator = resolver.resolve(query, resolve_error);
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if(iterator == end) // Documentation states that successful call is guaranteed to be non-empty
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{
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// if IPv4 resolution fails, try IPv6. Unintentional outgoing IPv6 connections should only
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// be possible if for some reason a hostname was given and that hostname fails IPv4 resolution,
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// so at least for now there should not be a need for a flag "using ipv6 is ok"
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try_ipv6 = true;
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}
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}
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catch (const boost::system::system_error& e)
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{
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if (resolve_error != boost::asio::error::host_not_found &&
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resolve_error != boost::asio::error::host_not_found_try_again)
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{
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throw;
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}
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try_ipv6 = true;
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}
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if (try_ipv6)
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{
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boost::asio::ip::tcp::resolver::query query6(boost::asio::ip::tcp::v6(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
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iterator = resolver.resolve(query6);
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if (iterator == end)
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throw boost::system::system_error{boost::asio::error::fault, "Failed to resolve " + addr};
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}
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//////////////////////////////////////////////////////////////////////////
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struct new_connection
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{
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boost::promise<boost::asio::ip::tcp::socket> result_;
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boost::asio::ip::tcp::socket socket_;
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explicit new_connection(boost::asio::io_service& io_service)
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: result_(), socket_(io_service)
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{}
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};
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const auto shared = std::make_shared<new_connection>(GET_IO_SERVICE(timeout));
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timeout.async_wait([shared] (boost::system::error_code error)
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{
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if (error != boost::system::errc::operation_canceled && shared && shared->socket_.is_open())
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{
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shared->socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
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shared->socket_.close();
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}
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});
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shared->socket_.async_connect(*iterator, [shared] (boost::system::error_code error)
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{
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if (shared)
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{
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if (error)
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shared->result_.set_exception(boost::system::system_error{error});
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else
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shared->result_.set_value(std::move(shared->socket_));
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}
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});
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return shared->result_.get_future();
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}
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}
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}
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