abstract_tcp_server2: timeout on RPC connections

contrib/epee/include/net/abstract_tcp_server2.h

@@ -135,6 +135,11 @@ namespace net_utils
     /// Handle completion of a write operation.
     void handle_write(const boost::system::error_code& e, size_t cb);
 
+    /// reset connection timeout timer and callback
+    void reset_timer(boost::posix_time::milliseconds ms, bool add);
+    boost::posix_time::milliseconds get_default_time() const;
+    boost::posix_time::milliseconds get_timeout_from_bytes_read(size_t bytes) const;
+
     /// Buffer for incoming data.
     boost::array<char, 8192> buffer_;
     //boost::array<char, 1024> buffer_;
@@ -158,6 +163,9 @@ namespace net_utils
     boost::mutex m_throttle_speed_in_mutex;
     boost::mutex m_throttle_speed_out_mutex;
 
+    boost::asio::deadline_timer m_timer;
+    bool m_local;
+
 	public:
 			void setRpcStation();
   };

contrib/epee/include/net/abstract_tcp_server2.inl

@@ -44,6 +44,7 @@
 #include <boost/thread/thread.hpp> // TODO
 #include <boost/thread/condition_variable.hpp> // TODO
 #include "misc_language.h"
+#include "net/local_ip.h"
 #include "pragma_comp_defs.h"
 
 #include <sstream>
@@ -55,6 +56,10 @@
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "net"
 
+#define DEFAULT_TIMEOUT_MS_LOCAL boost::posix_time::milliseconds(120000) // 2 minutes
+#define DEFAULT_TIMEOUT_MS_REMOTE boost::posix_time::milliseconds(10000) // 10 seconds
+#define TIMEOUT_EXTRA_MS_PER_BYTE 0.2
+
 PRAGMA_WARNING_PUSH
 namespace epee
 {
@@ -79,7 +84,9 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 		m_pfilter( pfilter ),
 		m_connection_type( connection_type ),
 		m_throttle_speed_in("speed_in", "throttle_speed_in"),
-		m_throttle_speed_out("speed_out", "throttle_speed_out")
+		m_throttle_speed_out("speed_out", "throttle_speed_out"),
+		m_timer(io_service),
+		m_local(false)
   {
     MDEBUG("test, connection constructor set m_connection_type="<<m_connection_type);
   }
@@ -139,6 +146,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 
     context = boost::value_initialized<t_connection_context>();
     const unsigned long ip_{boost::asio::detail::socket_ops::host_to_network_long(remote_ep.address().to_v4().to_ulong())};
+    m_local = epee::net_utils::is_ip_loopback(ip_);
 
     // create a random uuid
     boost::uuids::uuid random_uuid;
@@ -159,6 +167,8 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 
     m_protocol_handler.after_init_connection();
 
+    reset_timer(get_default_time(), false);
+
     socket_.async_read_some(boost::asio::buffer(buffer_),
       strand_.wrap(
         boost::bind(&connection<t_protocol_handler>::handle_read, self,
@@ -304,6 +314,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 				delay *= 0.5;
 				if (delay > 0) {
 					long int ms = (long int)(delay * 100);
+					reset_timer(boost::posix_time::milliseconds(ms + 1), true);
 					boost::this_thread::sleep_for(boost::chrono::milliseconds(ms));
 				}
 			} while(delay > 0);
@@ -329,6 +340,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
           shutdown();
       }else
       {
+        reset_timer(get_timeout_from_bytes_read(bytes_transferred), false);
         socket_.async_read_some(boost::asio::buffer(buffer_),
           strand_.wrap(
             boost::bind(&connection<t_protocol_handler>::handle_read, connection<t_protocol_handler>::shared_from_this(),
@@ -539,6 +551,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
 			do_send_handler_write( ptr , size_now ); // (((H)))
 
         CHECK_AND_ASSERT_MES( size_now == m_send_que.front().size(), false, "Unexpected queue size");
+        reset_timer(get_default_time(), false);
         boost::asio::async_write(socket_, boost::asio::buffer(m_send_que.front().data(), size_now ) ,
                                  //strand_.wrap(
                                  boost::bind(&connection<t_protocol_handler>::handle_write, self, _1, _2)
@@ -557,9 +570,53 @@ PRAGMA_WARNING_DISABLE_VS(4355)
   } // do_send_chunk
   //---------------------------------------------------------------------------------
   template<class t_protocol_handler>
+  boost::posix_time::milliseconds connection<t_protocol_handler>::get_default_time() const
+  {
+    if (m_local)
+      return DEFAULT_TIMEOUT_MS_LOCAL;
+    else
+      return DEFAULT_TIMEOUT_MS_REMOTE;
+  }
+  //---------------------------------------------------------------------------------
+  template<class t_protocol_handler>
+  boost::posix_time::milliseconds connection<t_protocol_handler>::get_timeout_from_bytes_read(size_t bytes) const
+  {
+    boost::posix_time::milliseconds ms = (boost::posix_time::milliseconds)(unsigned)(bytes * TIMEOUT_EXTRA_MS_PER_BYTE);
+    ms += m_timer.expires_from_now();
+    if (ms > get_default_time())
+      ms = get_default_time();
+    return ms;
+  }
+  //---------------------------------------------------------------------------------
+  template<class t_protocol_handler>
+  void connection<t_protocol_handler>::reset_timer(boost::posix_time::milliseconds ms, bool add)
+  {
+    if (m_connection_type != e_connection_type_RPC)
+      return;
+    MTRACE("Setting " << ms << " expiry");
+    auto self = safe_shared_from_this();
+    if(!self)
+    {
+      MERROR("Resetting timer on a dead object");
+      return;
+    }
+    if (add)
+      ms += m_timer.expires_from_now();
+    m_timer.expires_from_now(ms);
+    m_timer.async_wait([=](const boost::system::error_code& ec)
+    {
+      if(ec == boost::asio::error::operation_aborted)
+        return;
+      MDEBUG("Connection timeout, closing");
+      self->close();
+    });
+  }
+  //---------------------------------------------------------------------------------
+  template<class t_protocol_handler>
   bool connection<t_protocol_handler>::shutdown()
   {
     // Initiate graceful connection closure.
+    m_timer.cancel();
     boost::system::error_code ignored_ec;
     socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
     m_was_shutdown = true;
@@ -572,6 +629,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
   {
     TRY_ENTRY();
     //_info("[sock " << socket_.native_handle() << "] Que Shutdown called.");
+    m_timer.cancel();
     size_t send_que_size = 0;
     CRITICAL_REGION_BEGIN(m_send_que_lock);
     send_que_size = m_send_que.size();
@@ -629,6 +687,7 @@ PRAGMA_WARNING_DISABLE_VS(4355)
     }else
     {
       //have more data to send
+		reset_timer(get_default_time(), false);
 		auto size_now = m_send_que.front().size();
 		MDEBUG("handle_write() NOW SENDS: packet="<<size_now<<" B" <<", from  queue size="<<m_send_que.size());
 		if (speed_limit_is_enabled())