Expect prints command to console

daphnaw has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I have been using the Expect module to run a script which installs Oracle as user root. The problem is that the executing command itself which contains passwords is printed to the console, although raw_pty & log_stdout are set to 0:

my $tmp_dir   = Cwd::abs_path(dirname($0));
eval "use Expect;";
if ($@) {
   crash "Could not find Expect";
}
my $exp = Expect->new;
$exp->raw_pty(0);
$exp->log_stdout(0);
$exp->spawn("su - root");
$exp->expect($timeout,
    [ '-re', 'Password:\s*$' => sub {
        $exp->send("$root_password\n");
    }],
        [ timeout => sub { die "Timeout" }],
);
$exp->expect($timeout,
    [ '-re', '\][#%]\s*$' => sub {} ],
    [ timeout => sub { die "Timeout, no prompt" } ],
);
my $script = basename $0;
$cmd = "cd $tmp_dir; $^X $script $cmd";
PERLLIB ''; $^X $script $cmd";
<b>$cmd = "($cmd)";</b>
my $result = $exp->send("$cmd\n");
my $success;
my $end_string_seen;
my $time_cnt = 1000;
$exp->expect($timeout,
     [ '-re', '\][#%]\s*$'=> sub {} ],
     ['-re', $END_STRING  => sub { $end_string_seen = 1;} ],
     [ '-re', $SUCCESS_STRING => sub { $success = 1; } ],
     [ timeout => sub { 
        print $exp->before;
        $exp->clear_accum;
        $time_cnt--;
        if ($time_cnt > 0) {
            exp_continue();
        } else {
            die "Timeout, no prompt";
            }
    } ],
);
if ($success) {
     $exp->soft_close();
} else {
     crash("Installation failed");
}
exit 0;
[download]

$cmd is printed to the console: (cd /export/home/ana37/local/scripts/embedded_oracle; /export/home/ana37/local/scripts/embedded_oracle/perl/bin/perl-static oracle.pl --host localhost --remove --install --oraclepw Fx9qYfmz --oracleuser oracle --oraclehome /export/home/oracle --rootpw admin --datafiles /export/home/oracle/oradata/anadb --redo /export/home/oracle/redo --recovery /export/home/oracle/arch --smtp_server outbound.cisco.com --email_recipient dwasserm@cisco.com)

Comment on Expect prints command to console Download Code

Replies are listed 'Best First'.
Re: Expect prints command to console by Illuminatus (Curate) on Jun 21, 2010 at 00:26 UTC
Why are you setting raw_pty to 0? You want raw_pty turned on. In 'stty' land, raw mode means no echo.	[reply]
Re^2: Expect prints command to console by daphnaw (Acolyte) on Jun 21, 2010 at 15:29 UTC
Setting $exp->raw_pty(1) didnt make a difference. The command is still pronted the the console. Any ideas? Thanks	[reply]
Re: Expect prints command to console by Anonymous Monk on Apr 08, 2016 at 14:15 UTC
Set log_stdout AFTER the spawn worked for me (it did not work if it was set before the spawn): `$exp->spawn("su - root"); $exp->log_stdout(0); ## <<AFTER the spawn` [download] Apologies for answering an oldie, but it helped me.	[reply] [d/l]
Re: Expect prints command to console by Krambambuli (Curate) on Jun 21, 2010 at 15:50 UTC
Might help to make your code snippet runnable - what sort of Perl do you use ? I wanted to give it a try, but my Perl doesn't know what 'crash' is, so I get only compile errors. Is that `$cmd = "cd $tmp_dir; $^X $script $cmd";` [download] line you have correct ? Isn't $cmd undefined when the string is evaluated ?	[reply] [d/l]