CN2019_project-TCP/UDP File Transmission

This repository contains two file transmitting and video streaming applications, which use the TCP and UDP protocols respectively.

Requrements

• GCC/G++ Compiler
• OpenCV 3.0 or higher
• linux-like environment with GUI (e.g.: Ubuntu)

TCP Application

In this application, a client can list the files in the server, download files from the server, upload files to the server, and stream a .mpg video on the server.

Usage

1. In the command line shell, change to the TCP directory and type make. The programs will be compiled with the provided MAKEFILE.
2. Type ./server [port] in the shell to launch the server with a specific port. Here is an example: ./server 22
3. Open another shell and change to the directory where the program "client" is. Type ./client [ip:port] in the shell to launch a client and connect to the server. The ip is the IP address of the server and port is the same in step two. Here is an example: ./client 127.0.0.1:22
4. Now, you can use the following command in the client:
   1. ls : the files in the server folder will be listed.
   2. put <filename> : upload a file in the client folder to the server folder.
   3. get <filename> : download a file from the server folder to the client folder.
   4. play <videofile> : stream a .mpg video in the server folder.

UDP Application

In this application, the sender can send a file to the folder of the receiver, or send a .mpg video frame by frame to the receiver. This application uses GO-BACK-N and congestion control to deal with package loss.

Usage

1. In the command line shell, change to the UDP directory and type make. The programs will be compiled with the provided MAKEFILE.

2. Type ./agent <sender ip> <receiver ip> <sender port> <agent port> <receiver port> <lost rate> in the shell to launch an agent which simulates package loss in the network. Here is an example: ./agent 127.0.0.1 127.0.0.1 5000 5001 5002 0.3

3. Open another shell and change to the directory where the porgram "receiver" is. Type ./receiver <agent ip> <agent port> <receiver port> in the shell. Here is an example: ./receiver 127.0.0.1 127.0.0.1 5000 5001 5002

4. Open another shell and change to the directory where the program "sender" is. Type ./sender <agent ip> <sender port> <agent port> <filename> in the shell. The following are the command options:

   1. .mpg : the video specified in <filename> which is .mpg file will be played at the receiver end.
   2. other file type : the file specified in <filename> in the sender folder will be sent from the sender folder to the receiver folder.

   Here are some examples: ./sender 127.0.0.1 127.0.0.1 5000 5001 5002 file.txt ./sender 127.0.0.1 127.0.0.1 5000 5001 5002 video.mpg

Note

• The TCP application supports multiple connections from clients to the server. The UDP application only support one sender, one receiver, and one agent at the same time.