On Sat, Oct 13, 2007 at 07:37:23PM +0100, Damian Brasher wrote:
>>> ./expect << EOF
>>> spawn ssh root@$IP_ADD_A 'ls > junk'
>>> expect "*?assword:*"
>>> send -- "$ROOT_PASS_A\r"
>>> send -- "\r"
>>> expect eof
>>>
I use expect all the time to log in to ssh sites (with passwords or
passkeys, as appropriate)
The problem is probably the pattern for password - remember that expect
expects to search within strings, so you don't need the '*' bits. you
could use something like:
ROOT_PASS=fred
expect <<EOF
spawn ssh root@$IP_ADD_A ls > junk
expect 'assword:'
send -- "$ROOT_PASS\r"
expect eof
EOF
The command doesn't need quotes round it - everything after the host
name (including redirection symbols as above) are passed to the host, so
the 'ls' command is run in the root user's home directory and the output
redirected to 'junk' in that directory.
I tend to run these login sections in a "while" loop - this allows for a
range of responses to arrive, some optional. For example, when
connecting to a range of hosts I recognise, so I know they are valid, I
have:
set logindone 0
spawn ssh $targetuser@$targethost
while 1 {
expect {
"login:" {if $logindone==0 {set logindone 1
send "$targetuser\r"}}
"sword:" {send "$targetpasswd\r"}
"Do you want to choose a different one" {sleep 0.2;send
"\r"}
"Are you sure you want to continue connecting" {sleep
0.2;send "yes\r"}
"\\$ $" {send "export DISPLAY=$hostip:0\r" ; break}
"# $" {send "export DISPLAY=$hostip:0\r" ; break}
"\] $" {send "export DISPLAY=$hostip:0\r" ; break}
timeout {send_user "I have timed out logging in to
$targethost as $targetuser\r" ; exit}
}
}
interact timeout 300 {send " \177"}
The 'Do you want to choose..' bit is to get round over-zealour RedHat
security options, and the 'Are you sure' is the ssh 'it's a new host'
prompt. The next three lines cope with a number of prompt types,and the
last bit is a clean timeout response. (The 'login' bit is there because
I actually use the same fragment to support telnet too). Once it's
logged in it goes into interactive mode so that I can do whatever I want
on the session, but sends space-delete after 5 minutes of inactivity to
keep the connection alive. I also have versions of the above that log
in, then run a specified command under expect's control - this allows
for commands which prompt for data.
I too tried to write expect scripts from man pages etc, but was very
glad when I finally took the plunge and bought the O'Reilly "Exploring
Expect", written by expect's author, Don Libes. It's not only very
useful, it's also quite a good read!
Simon
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