feup-rcom-proj2
This repository comprises the second part of the Computer Networks course unit project. The goal was to create a C application to download files from an FTP server.
Project description
This project emulates the process of retrieving a file from an FTP server as described below using telnet. The program creates two socket connections and executes a bunch of instructions to download a file.
Using telnet
The following instructions retrieve a file from an FTP server using telnet.
Opening first connection
> telnet <server> <port>
> user anonymous # or specific user
> pass whatever # or specific password
> pasvAt this point the connection should send 6 bytes, the first 4 are the IP and the last 2 bytes the port in the format b1 * 256 + b2 (where b1 is the first byte and b2 the second byte) of the server.
Opening second connection
The server and the port are the data returned from the first connection.
> telnet <server> <port>Back in the first connection:
> retr <path to file>The file content is sent to the second connection.
Compiling
Run make in the root directory of the repository and the binary executable file is placed inside a bin directory in the repository root.
Running
To run the program use:
download <url>- the url should be in the format ftp://[<user>:<password>@]<host>/<url-path>
Documentation
The documentation is generated automatically with doxygen and can be accessed here.
Disclaimer
This repository contains the C solution for the problem. Note that it might contain errors and should not be used as a solution for anyone besides the authors.