Carreer:Networking Programming in Unix (C programming Language) Post: 302232999

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Top Forums UNIX for Dummies Questions & Answers Carreer:Networking Programming in Unix (C programming Language) Post 302232999 by ovais245 on Friday 5th of September 2008 07:05:26 PM

09-05-2008

Registered User

Write or study a small program that mimics the most common login procedures in UNIX.
You have two options here. Either, you write it yourself according to the specification
below, or you copy the file
/cab/cestud/work/edu/course/EDA263_Computer_Security/
lib/login_linux/login_linux.c into your home directory. If you choose to write
it yourself the following should be implemented.
- The program begins with displaying ”login:” and takes the username as input.
7
- Then the program writes ”Password:” and waits for the password to be entered,
which should not be visible on the terminal (use the function getpass(3) that
among other things will see to that the text is not ”echoed” on the terminal).
- The program queries the system’s user database to see if the username exists. If
this is the case it encrypts the entered password (with a known algorithm) and
ensures it corresponds to the stored encrypted password belonging to the actual
user. Suitable library routines are getpwnam(3), crypt(3) and strncmp(3).
- If the username does not exist, or if the password is wrong, the program displays
”Login incorrect” and restarts from the beginning, otherwise it writes something
like ”Welcome to this System!” and terminates.
Test that your program works by compiling and running it.

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LEARN ABOUT DEBIAN

gvrng

gvrng(1)																  gvrng(1)

NAME

       gvrng - An interactive, introductory programming language.

SYNTAX

       gvrng [world file | program file]

DESCRIPTION

       Guido van Robot is a project developed by advanced high school students for use by their peers as a learning tool and precursor to the fur-
       ther study of programming with Python. It is a minimalistic programming language providing just enough syntax to help  students	learn  the
       concepts  of  sequencing, conditional branching, looping and procedural abstraction. It's biggest strength is that it permits this learning
       in an environment that combines the thrill of problem-solving with instant visual feedback. In short, it is  an	interactive,  introductory
       programming  language that is excellent for learning the basic concepts of programming, applicable in any high-level language. Best of all,
       it's a whole lot of fun, too!

       At this point, you are probably asking yourself, "What is GvRng, specifically?" The gist of it is that it is a robot represented by a  tri-
       angle  on  the screen that moves around in a world made up of streets and avenues, walls and "beepers", which Guido can collect or set. His
       actions are completely guided by a program written by the user.

FILES

       /usr/bin/gvrng
       /usr/lib/gvrng
       /usr/share/doc/gvrng

AUTHORS

       Stas Zytkiewicz - stasz@linux.isbeter.nl
       Waseem Daher - wdaher@mit.edu
       Steve Howell - showell@zipcon.net

SEE ALSO

       http://gvrng.sourceforge.net

Stas Zytkiewicz 						  1.0  09/13/2004							  gvrng(1)