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 OSF1

netconfig

netconfig(8)						      System Manager's Manual						      netconfig(8)

NAME

       netconfig - Launches the SysMan Menu to the Network Setup Wizard

SYNOPSIS

       /usr/sbin/netconfig

       /usr/sbin/sysman net_wizard

DESCRIPTION

       The  Network Setup Wizard of the SysMan Menu can be used to configure and modify the configuration of a TCP/IP network on a Tru64 UNIX sys-
       tem.

       Use the Network Setup Wizard, netconfig, to do the following: Configure network interfaces, such as  Ethernet,  FDDI  and  Token  Ring  and
       existing ATM interfaces Enable and disable the following daemons: gated, joind, routed, and rwhod Configure the system as an IP router Add,
       modify, and delete entries in the following files: /etc/routes, /etc/gateways, etc/hosts, /etc/hosts.equiv, and /etc/networks

       Online help is available for the Network Management dialog boxes. To get help, click on any Help button.

RESTRICTIONS

       You must be root or have the appropriate privileges to run this application.

FILES

       Specifies the environment variables that define the netconfig configuration on your system Specifies Internet routing information Specifies
       the host name file Specifies the trusted hosts file Specifies the network name file Specifies Internet static routing information

SEE ALSO

       Commands: ifconfig(8), netsetup(8), rc.config(8), rcinet(8), sysman_menu(8)

       Files: gateways(4), hosts(4), hosts.equiv(4), networks(4), routes(4)

       Networking: network_manual_setup(7)

																      netconfig(8)