write SSU2 socket buffer sizes to log

libi2pd/SSU2.cpp

@@ -256,8 +256,27 @@ namespace transport
 			socket.open (localEndpoint.protocol ());
 			if (localEndpoint.address ().is_v6 ())
 				socket.set_option (boost::asio::ip::v6_only (true));
-			socket.set_option (boost::asio::socket_base::receive_buffer_size (SSU2_SOCKET_RECEIVE_BUFFER_SIZE));
+			boost::asio::socket_base::receive_buffer_size receive_buffer_size_set (SSU2_SOCKET_RECEIVE_BUFFER_SIZE);
-			socket.set_option (boost::asio::socket_base::send_buffer_size (SSU2_SOCKET_SEND_BUFFER_SIZE));
+			boost::asio::socket_base::send_buffer_size send_buffer_size_set (SSU2_SOCKET_SEND_BUFFER_SIZE);
+			socket.set_option (receive_buffer_size_set);
+			socket.set_option (send_buffer_size_set);
+			boost::asio::socket_base::receive_buffer_size receive_buffer_size_get;
+			boost::asio::socket_base::send_buffer_size send_buffer_size_get;
+			socket.get_option (receive_buffer_size_get);
+			socket.get_option (send_buffer_size_get);
+			if (receive_buffer_size_get.value () != receive_buffer_size_set.value () ||
+				send_buffer_size_get.value () != send_buffer_size_set.value ())
+			{
+				LogPrint (eLogWarning, "SSU2: Socket receive buffer size: requested = ",
+					receive_buffer_size_set.value (), ", got = ", receive_buffer_size_get.value ());
+				LogPrint (eLogWarning, "SSU2: Socket send buffer size: requested = ",
+					send_buffer_size_set.value (), ", got = ", send_buffer_size_get.value ());
+			}
+			else
+			{
+				LogPrint (eLogInfo, "SSU2: Socket receive buffer size: ", receive_buffer_size_get.value ());
+				LogPrint (eLogInfo, "SSU2: Socket send buffer size: ", send_buffer_size_get.value ());
+			}
 			socket.non_blocking (true);
 		}
 		catch (std::exception& ex )