I need to automate logging into a TELNET session using expect, but I need to take care of multiple passwords for the same username.
Here's the flow I need to create:
For what it's worth, here's what I've got so far:
#!/usr/bin/expect
spawn telnet 192.168.40.100
expect "login:"
send "spongebob\r"
expect "password:"
send "squarepants\r"
expect "login incorrect" {
expect "login:"
send "spongebob\r"
expect "password:"
send "rhombuspants\r"
}
expect "prompt\>" {
send_user "success!\r"
}
send "blah...blah...blah\r"
Needless to say this doesn't work, and nor does it look very pretty. From my adventures with Google expect seems to be something of a dark-art. Thanks in advance to anyone for assistance in the matter!
Have to recomment the Exploring Expect book for all expect programmers -- invaluable.
I've rewritten your code: (untested)
proc login {user pass} {
expect "login:"
send "$user\r"
expect "password:"
send "$pass\r"
}
set username spongebob
set passwords {squarepants rhombuspants}
set index 0
spawn telnet 192.168.40.100
login $username [lindex $passwords $index]
expect {
"login incorrect" {
send_user "failed with $username:[lindex $passwords $index]\n"
incr index
if {$index == [llength $passwords]} {
error "ran out of possible passwords"
}
login $username [lindex $passwords $index]
exp_continue
}
"prompt>"
}
send_user "success!\n"
# ...
exp_continue
loops back to the beginning of the expect block -- it's like a "redo" statement.
Note that send_user
ends with \n
not \r
You don't have to escape the >
character in your prompt: it's not special for Tcl.