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Calling a function which uses expect from a shells script

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# 1  
Old 11-03-2011
Calling a function which uses expect from a shells script
Hi all,

This is the first time i am using expect.

I am trying to call a function with in the shell script. The function will shh to a new server and will pass the password using expect and send. I need help in calling the fuction i am getting follaowing errors...

here the script
Code:
#!/usr/bin/ksh
 
check_status() {
echo $1
spawn ssh user@$1
expect "user's Password:"
send "pwd\r"
expect "user@sv1"
send "uname -a\r"
send "/app/status.sh \r"
interact
}

check_status server ;

I am getting the following error.
Code:
user@server$ ./checkFunc.sh
server
./checkFunc.sh[4]: spawn: not found.

Thanks,
Firestar

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Last edited by vbe; 11-03-2011 at 02:03 PM.. Reason: Next time use code tags rather than fancy fonts...
# 2  
Old 11-03-2011
Maybe this:
Code:
expect <<END >> ./expectExec.log
	spawn ssh user@$1
	expect "user's Password:"
	send "pwd\r"
	expect "user@sv1"
	send "uname -a\r"
	send "/app/status.sh \r"
	interact
END

Or put the script in another file, and:
Code:
#!/<path to>/expect -f
spawn ssh user@$1
expect "user's Password:"
send "pwd\r"
expect "user@sv1"
send "uname -a\r"
send "/app/status.sh \r"
interact

Check this link: Expect - Wikipedia, the free encyclopedia . You will find a SSH example on it!

I hope it helps!
# 3  
Old 11-03-2011
You needed third-party hacking tools to inject passwords into ssh because ssh -- and any sane login like sudo, su, and so forth -- are all explicitly designed to prevent this. It's a small helpful hint, written in mile-high flashing neon letters, that it's a really bad idea.

This is because recoverable text passwords are incredibly difficult to keep safe. Passing them through variables, files, or arguments opens them up to interception in a huge variety of ways.

ssh has a much better alternative built right in: keys. Just having the right files in the right places lets ssh go through fully automatically with no modification to your program. See passwordless ssh.
Last edited by Corona688; 11-03-2011 at 03:37 PM..
# 4  
Old 11-03-2011
@felipe.vinturin

Thank you the reply..

when i keep the script in a new ans try to execute the expect script is exiting after send "uname -a\" command. I couldn't find why this is happeneing ...

any ideas..
# 5  
Old 11-03-2011
If you use ssh keys as intended instead of bruteforcing the password with third-party hacking tools, your program will go straight into ssh with no mysterious hangs or premature exits.

Code:
ssh username@host uname -a ';' /app/status.sh

# 6  
Old 11-03-2011
@felipe.vinturin

Or can you help in writitng a while loop in the expect script so that the while will read a text file line by line and execute the script once per line.
some thing like this

while read line
do
{ script }
done < file.txt
# 7  
Old 11-03-2011
If you use ssh keys as intended instead of insecurely kludging plaintext passwords with third-party brute-forcing tools, you can directly feed entire shell scripts into ssh and get them executed on the remote end.

Code:
ssh username@host /bin/sh -s arg1 arg2 <<"EOF"
echo "arg1 is $1"
echo "arg2 is $2"

for N in 1 2 3 4 5
do
        echo $N
done
EOF
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