Doing some exercises / tutorials with xinetd. I setup the script below as a xinetd controlled service.
#!/bin/bash
str1="password"
printf 'Hello...'
printf '%(%Y-%m-%d)T\n' -1
# Prompt for password that will be compared with str1.
echo "Please enter a password"
read str2
# compare strings
if [ "$str1" = "$str2" ]; then
echo "right"
else
echo "wrong"
fi
Created file "check" with the below content in /etc/xinetd.d directory.
service check
{
port = 41200
server = /tmp/script.sh
user = root
socket_type = stream
protocol = tcp
wait = no
only_from = 192.168.0.1
}
I added the following line in the file /etc/services: check 41200/tcp
The script works fine as expected locally. When user enters "password", response is "right" and "wrong" when anything else is entered. However, it doesn't seem to work when a remote host connects via telnet. Always get the response "wrong".
Is there something I am missing here?
CodePudding user response:
telnet uses DOS line endings. Try stripping off a trailing carriage-return from str2
before comparing it with str1
.
str2=${str2%$'\r'}