Romanian railways application

You can find the romanian version of this document here.

video_ro_comp.mp4

Connect

To establish connection with my server make sure to:

• install openvpn3
• start a session using this vpn key (openvpn3 session-start --config docs/vpnkey.ovpn)
• send a mail at [email protected] for the credentials asked at the previous step
• compile and run the client application with the following arguments: '10.100.0.30' and '2970'

Main files

• official documentation
• client application
• server application

Technologies

• C - socket(), bind(), connect(), pthread_t
• C++ - std::mt1337
• libxml2 - official page

Features

The communication protocol

Please consult some definitions from here

• [id_train, time_departure, time_arrival, status] routes(location_departure, location_arrival);
• [id_train, time_departure, location_arrival] departures(location_departure);
• [id_train, time_arrival, location_departure] arrivals(location_arrival);
• bool report(id_train, minutes);
• bool quit();

Speed

• prethreaded execution
• create thread for each client
• i/o multiplexing with non-blocking calls

Correctness

• client uses tcp to server when sending data
• client uses udp to server when sending queries
• server uses tcp to client when sending data

Security

• specific procedures for possible errors
• solutions if one party stops responding
• test driven-development

Limitations

• only 1024 users can be connected at once
• not Windows portable