Basically I need to open a expect script from a bash script

Bodiless Sleeper · 11-01-2018, 02:15 PM

This is the bash script

Code:

#!/bin/bash

cd /home/my_user/Downloads
username="vpnbook"
password="h5bhea6u"
read -sp "Enter Sudo Password: " sudopassword

exec /home/my_user/Downloads/VPN2.exp

And this is the expect script

Code:

#!/usr/bin/expect

spawn sudo openvpn vpnbook-de4-tcp443.ovpn
expect "password for my_user: "
send "$sudopassword\r"

expect "Enter Auth Username: "
send "$username\r"

expect "Enter Auth Password: "
send "$password\r"

expect "$ "

EOF

When I run the bash script in terminal I get this output:

Enter Sudo Password: (here it waits until I enter the password and then it prints out the following text which is accidentaly or not the first line of code in the script) spawn sudo openvpn vpnbook-de4-tcp443.ovpn

And it just stops there
I tried putting source and sh instead of exec but it didn't help
I hardcoded the variables in expect script and it runs perfectly so I guess that'll have to do

scasey · 11-01-2018, 02:48 PM

exec with a command "replaces the shell," which would mean that the variables would be lost.
sh would create a new shell, which also wouldn't contain the variables.

I'd expect source (or .) to work, but you say not.

Try exporting the variables in the bash script.

michaelk · 11-01-2018, 03:35 PM

expect is an extension to the tcl language. In addition to the above suggestions you can add command lines arguments to your expect to "pass" the username and password or just add the code to perform the same functions in your bash script to your expect script.

rnturn · 11-06-2018, 12:47 AM

Quote:

Originally Posted by Bodiless Sleeper

This is the bash script

Code:

#!/bin/bash

cd /home/my_user/Downloads
username="vpnbook"
password="h5bhea6u"
read -sp "Enter Sudo Password: " sudopassword

exec /home/my_user/Downloads/VPN2.exp

And this is the expect script

Code:

#!/usr/bin/expect

spawn sudo openvpn vpnbook-de4-tcp443.ovpn
expect "password for my_user: "
send "$sudopassword\r"

expect "Enter Auth Username: "
send "$username\r"

expect "Enter Auth Password: "
send "$password\r"

expect "$ "

EOF

I don't think that "username" and "password" are being passed to the environment seen by Expect.

You ought to be able to pass that information to the expect script on the command line as

Code:

exec /home/my_user/Downloads/VPN2.exp $username $password

and retrieve these within the Expect script with something like

Code:

set username [lindex $arg0]
set password [lindex $arg1]

You'll need to include the "-f" switch on the shebang line for this to work, though. And... the big caveat with this is that "username" and "password" would be visible to anyone who knows to execute "ps" while your Expect script is running. Also, if they were defined in your environment, you could see them with the right "ps" switch anyway.

You could also put the login information (say: "username/password") into a hidden file with permissions that hide it from everyone but you (and root) and open that file in the Expect script. That's a little more involved and my Expect is pretty rusty but you could do something like:

Code:

set pwfile ".vpninfo.dat"
set pw [open ./$pwfile r]
set pwrecord [split [read $pw] "\n"]
if {[string length $pwrecord] > 0} {
    # Split "pwrecord" to get sitename, username, password, whatever
    # How you do this depends on how you format the user/pw record(s)
    # If you have multiple records in the file you'll need a foreach{}
    # loop.
}
# Spawn the VPN connect command using the parsed information...

This is approximately what you'd need. (Hey... I did say my Expect was rusty. And my textbooks are in storage for the time being.) I suspect you can figure out the rest.

Have fun...