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Interactive Process Automation

Autoexpect is a tool that automates the generation of Expect scripts for interactive applications like SSH. It works by watching a user's session and recording the interactions to create an Expect script that can replay the steps. For example, autoexpect can generate a script to SSH into a remote host, change the root password, and logout. The generated script uses Expect to spawn the SSH process, send passwords and commands, and expect responses to fully automate the password changing process. This allows easy automation of interactive tasks like remote administration without having to manually write Expect scripts.

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85 views8 pages

Interactive Process Automation

Autoexpect is a tool that automates the generation of Expect scripts for interactive applications like SSH. It works by watching a user's session and recording the interactions to create an Expect script that can replay the steps. For example, autoexpect can generate a script to SSH into a remote host, change the root password, and logout. The generated script uses Expect to spawn the SSH process, send passwords and commands, and expect responses to fully automate the password changing process. This allows easy automation of interactive tasks like remote administration without having to manually write Expect scripts.

Uploaded by

mukhtar_77624
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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I g o r B r a v e r m a n

Interactive Process
Interactive Process
Automation
Automation
Igor Braverman
E&M Computing Ltd.
I g o r B r a v e r m a n
What is expect?
Expect is a tool primarily for automating interactive
applications such as telnet, ftp, passwd, fsck, ssh, rlogin,
tip, etc.
Expect really makes this stuff trivial.
Expect is also useful for testing applications.
I g o r B r a v e r m a n
autoexpect is a tool for generating Expect script from watching
a session.
The simplest way to use autoexpect is to call it from the command
line with no arguments.
By default, autoexpect spawns a shell for you. Given a program
name and arguments, autoexpect spawns that program.
The Tip: Autoexpect
I g o r B r a v e r m a n
Autoexpect execution example:
igor@genesis > autoexpect ssh root@test
autoexpect started, file is script.exp
Enter passphrase for key '/home/igor/.ssh/id_rsa':
Last login: Mon Jan 3 14:39:24 2005 from genesis
[root@test ~] #
Changing password for user root.
New UNIX password:
passwd root
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root@test ~] # logout
Connection to test closed.
autoexpect done, file is script.exp
I g o r B r a v e r m a n
Resulting Expect script
spawn ssh root@test
match_max 100000
expect -exact "Enter passphrase for key '/home/igor/.ssh/id_rsa': "
send -- "samplePhrase\r"
expect "root@test ~\] # "
send -- "passwd root\r"
expect "Changing password for user root.\r
New UNIX password: "
send -- "New Password\r"
expect -exact "\r
Retype new UNIX password: "
send -- "New Password\r"
expect -exact "\r
passwd: all authentication tokens updated successfully.\r
\[root@test ~\] # "
send -- logout"
expect eof
I g o r B r a v e r m a n
Expect script
set pass_phrase [lrange $argv 0 0]
set new_pass [lrange $argv 1 1]
set argv [lrange $argv 2 end]
while {[llength $argv]>0} {
set host [lrange $argv 0 0]
set argv [lrange $argv 1 end]
spawn ssh root@$host
match_max 100000
expect "Enter passphrase"
send -- $pass_phrase\r"
expect "# "
send -- "passwd root\r"
expect re "New.+word: "
send -- $new_pass\r"
expect re "Re.+word: "
send -- $new_pass\r"
expect re "successfully.+# "
send -- logout"
expect eof
}
I g o r B r a v e r m a n
Running the script
igor@genesis (~) > ./script.exp samplePhrase password dwarkin
spawn ssh root@dwarkin
Enter passphrase for key '/users/igor/.ssh/id_rsa': samplePhrase
Last login: Wed Jan 5 10:03:07 2005 from localhost
Sun Microsystems Inc. SunOS 5.9 Generic May 2002
root@dwarkin (~) # passwd root
New Password:
Re-enter new Password:
passwd: password successfully changed for root
root@dwarkin (~) # exit
logout
Connection to 0 closed.
igor@genesis (~) >
I g o r B r a v e r m a n
THANK YOU
THANK YOU

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