- Please choose one of following programing languages: C, C++, Java, Python;
- 本项目采用的是python3.6
- LFTP should use a client-server service model;
- 本项目使用客户端-服务器的模式
- LFTP must include a client side program and a server side program; Client side program can not only send a large file to the server but also download a file from the server.
Sending file should use the following format：
- LFTP lsend myserver mylargefile Getting file should use the following format
- LFTP lget myserver mylargefile The parameter myserver can be a url address or an IP address.
- 本项目，客户端不仅可以向服务器上传大文件，也可以从服务器下载大文件
- LFTP should use UDP as the transport layer protocol.
- 本项目利用UDP来作为传输层协议
- LFTP must realize 100% reliability as TCP;
- 本项目实现类似TCP的100%可靠性，处理了丢包，超时，数据包顺序不一致等问题
- LFTP must implement flow control function similar as TCP;
- 本项目实现了类似TCP的流控制，在接收方维护一个rwnd接收窗口
- LFTP must implement congestion control function similar as TCP;
- 本项目实现了类似TCP的阻塞控制，在发送方维护一个cwnd阻塞窗口
- LFTP server side must be able to support multiple clients at the same time;
- 本项目支持多个用户同时向服务器收发文件，使用了多线程的机制
- LFTP should provide meaningful debug information when programs are
executed.
- 本项目提供了有意义的debug消息来显示发送情况，包括丢包，阻塞等事件的处理