Difference between revisions of "Telnet"
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Telnet client and server are installed by default on the standard Armadeus rootfs. (Included in Busybox).<br> | Telnet client and server are installed by default on the standard Armadeus rootfs. (Included in Busybox).<br> | ||
As it's not a good idea to log in as root through Telnet, create a user that you will use when connecting: | As it's not a good idea to log in as root through Telnet, create a user that you will use when connecting: | ||
| + | <pre class="apf"> | ||
# adduser guest | # adduser guest | ||
Changing password for guest | Changing password for guest | ||
| Line 11: | Line 12: | ||
Retype password: | Retype password: | ||
Password for guest changed by root | Password for guest changed by root | ||
| + | </pre> | ||
==Usage== | ==Usage== | ||
===Target=== | ===Target=== | ||
Telnet server (''telnetd'') is launched by ''inetd'' when someone is trying to access port 23. This behaviour can be configured in ''/etc/inetd.conf'': | Telnet server (''telnetd'') is launched by ''inetd'' when someone is trying to access port 23. This behaviour can be configured in ''/etc/inetd.conf'': | ||
| + | <pre class="apf"> | ||
# cat /etc/inetd.conf | # cat /etc/inetd.conf | ||
23 stream tcp nowait root /usr/sbin/telnetd telnetd -l /bin/login | 23 stream tcp nowait root /usr/sbin/telnetd telnetd -l /bin/login | ||
| + | </pre> | ||
If so you just have to launch ''inetd'' at the start of your system. You can for example add the following script to ''/etc/init.d/'' : | If so you just have to launch ''inetd'' at the start of your system. You can for example add the following script to ''/etc/init.d/'' : | ||
| Line 69: | Line 73: | ||
===Host=== | ===Host=== | ||
When you're sure that ''inetd'' is running on your target, launch the connection that way: | When you're sure that ''inetd'' is running on your target, launch the connection that way: | ||
| − | + | <pre class="apf"> | |
| − | + | $ telnet 192.168.0.10 | |
| − | + | Trying 192.168.0.10... | |
| − | + | Connected to 192.168.0.10. | |
| − | + | Escape character is '^]'. | |
| − | + | armadeus login: guest | |
| − | + | Password: | |
| − | + | $ uname -a (to check you're really on your board ;-) ) | |
| − | + | Linux armadeus 2.6.27.2 #1 PREEMPT Thu Dec 4 14:09:27 CET 2008 armv4tl unknown | |
| + | </pre> | ||
==Links== | ==Links== | ||
Revision as of 12:29, 16 February 2009
From Wikipedia:
"Telnet (Telecommunication network) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in 1969 beginning with RFC 15 and standardized as IETF STD 8, one of the first Internet standards. Typically, telnet provides access to a command-line interface on a remote machine.
The term telnet also refers to software which implements the client part of the protocol."
Contents
Installation
Telnet client and server are installed by default on the standard Armadeus rootfs. (Included in Busybox).
As it's not a good idea to log in as root through Telnet, create a user that you will use when connecting:
# adduser guest Changing password for guest New password: Retype password: Password for guest changed by root
Usage
Target
Telnet server (telnetd) is launched by inetd when someone is trying to access port 23. This behaviour can be configured in /etc/inetd.conf:
# cat /etc/inetd.conf 23 stream tcp nowait root /usr/sbin/telnetd telnetd -l /bin/login
If so you just have to launch inetd at the start of your system. You can for example add the following script to /etc/init.d/ :
#! /bin/sh
[ -f /usr/sbin/inetd ] || exit 0
RETVAL=0
# See how we were called.
case "$1" in
start)
echo -n "Starting INET services: "
inetd
RETVAL=$?
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/inet && echo "done"
;;
stop)
echo -n "Stopping INET services: "
killall inetd
RETVAL=$?
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/inet && echo "done"
;;
status)
echo -n "INET services are: "
if [ -f /var/lock/subsys/inet ]; then
echo "running"
else
echo "not running"
fi
;;
restart)
$0 stop
$0 start
RETVAL=$?
;;
reload)
killall -HUP inetd
RETVAL=$?
;;
*)
echo "Usage: $0 {start|stop|status|reload|restart}"
exit 1
esac
exit $RETVAL
Host
When you're sure that inetd is running on your target, launch the connection that way:
$ telnet 192.168.0.10 Trying 192.168.0.10... Connected to 192.168.0.10. Escape character is '^]'. armadeus login: guest Password: $ uname -a (to check you're really on your board ;-) ) Linux armadeus 2.6.27.2 #1 PREEMPT Thu Dec 4 14:09:27 CET 2008 armv4tl unknown
