TFTP, SYSC 3303

Supriya Gadigone
Kshamina Ghelani
Daniel Gravel
Bhavik Tailor
Tanzim Zaman

###Files
####FileTransferClient.java:

• The client is able to send a read/write request
  
• establishes conntection with server and sends file in blocks of 512 bytes
  
• Read: read file from server, Write: write file to server
  
• contains a prompt method that prompts user for Normal vs Test mode and Verbose vs Quiet mode, path for files, read vs write and file name
  
• extends Host.java
  

####IntermediateHost.java:

• passes messages and responses between server and client in the form of packets when client is running in test mode
  
• loses specified packet
• delays specified packet for user specified time
• duplicates specified packet after user specified time
• runs in an infinite loop
  
• extends Host.java
  

####FileTransferServer.java:

• Receives messages from client via IntermediateHost and responds
  
• If RRQ, responds with acknowledgement packet
  
• If WRQ, responds with data packet
  
• extends Host.java
  

####Host.java:

• Abstract class that maintains all send and receive methods
  

####Printer.java:

• Takes care of all print messages to show what is happening with client/intermediate/server
  

####RequestType.java

• Class with enums of all different types of packets

####Validater.java

• Class which contains all validation methods for packet type, validity of file, and a method that parses out filename and mode

###Instructions
When running in normal mode:

1. Run main for FileTransferServer
   
2. Run main for FileTransferClient
   

When running in test mode:

1. Run main for FileTransferServer
   
2. Run main for IntermediateHost
   
3. Run main for FileTransferClient
   

• Will be prompted by client to enter a pathname.

• Type help when prompted to enter a command by client to see a list of commands you can use

• Read request will transfer file from Desktop to user specified path

• Write request will transfer file from user specified path to Desktop

• In the client you will be asked for a path, this is the path to where you want to save files and upload from.

• The available commands for the client are

• quit - exits the client

• pwd - present working directory

• ls - list of files in directory

• normal - sends packets from client directly to server

• test - sends file to intermediate host which forwards to server

• read - reads a file from server

• write - writes a file to server

• verbose - prints all data

• !verbose - prints minimum amount of information

• help - shows commands and sample queries

• An example of a command is normal/test read/write filename.txt verbose/!verbose

• If at anytime you want to change directories simply type in the new directory

Testing Errors:

• Disk Full
• To test disk full error in client, obtain a USB disk that is basically full and set the path of the client to that disk
• Make a RRQ for a file in Server, and the file should stop reading as soon as the disk is full
• For Server Disk full, the path of the server directory has to be changed within the code

* File Already Exists * For a Write, copy the file from the client directory into the server directory * Attempt the WRQ, the server will send an error packet packet back to client saying the file already exists * Client will be re-prompted * For a Read, copy the file from server to client * Attempt a RRQ, the client will re-prompt the user saying that the file already exists
* File Not Found * For a write request, make sure the file you want to transfer is not in the client directory * Attempt to send this file, the client will be re-prompted because the file doesn't exist * For a read request, make sure the file is not in the server directory * Attempt a read request, the server will send an error to client saying that the file does not exist
* File Access Denied * Take the file that needs to be read or written and change its access to read-only * this will cause the error to occur on both client and server side
* Illegal TFTP * An illegal TFTP operation can be performed using the intermediate host * The options in the Intermediate host that provide this error are: * Corrupt Request Packet * Change OpCode * Invalid Packet Size * Change the Block Number * Follow all prompts accordingly to create an Illegal TFTP
* Unknown Transfer ID * An unknown transfer ID can also be performed through the intermediate * Use Change TID prompt and follow the instructions accordingly to create the error