TFTP implementation

This is a TFTP implementation. This implementation only runs on UNIX systems.

Project Structure

The project is structured into 3 major packages:

• Client: control flow for TFTP client and user interaction functionality
• Server: control flow for TFTP server and basic connection establishment
• Shared: packet manipulation, data flow, file manipulation and utils that are used by both server and client

For each new client connection, the server opens a new thread to handle the file transfer, while the main thread remains available to listen for new requests.

Functionality

basic functionality for TFTP

• send files of any kind (e.g. .txt, .PNG) to server directory
• receive files of any kind from server to client directory
• supported sending modes (mail is deprecated):
  • netascii: converts requested file to netascii format for sending and converts it to local after receiving
  • octet: sends bytes of file as read in by file descriptor

Getting Started

Steps:

1. make
2. cd to Server/
3. execute ./server_appl <server-ip>
   --- make sure to be in admin mode for this (bindinig to port 69)
   --- the server-IP is optional, the default value is 127.0.0.1
4. cd to Client/
5. execute ./client_appl <server-ip>
   --- the server-IP is optional, the default value is 127.0.0.1
6. follow instructions on ./client_appl console

Tested Cases

• TFTP functionality
  • RRQ and WRQ in both octet and netascii mode
  • server can handle Requests from multiple clients at once
  • last packet has 512 bytes data thus another 0 data byte packet is sent
  • correct handling of errors like
    • requesting missing file from server
    • exceeding maximum timeouts
• verification with third party tftp tools
  • server was tested atftp
  • client was tested with the solar winds tftp server
• data sending over LAN