Folks-

Given machine A, B, and C...

I'm trying to login from A to B and remotely execute an interactive command on C.

A is running a perl script that uses Net::SSH:Perl to machine B. This works fine for both SSH1 and SSH2.

Then A tries to run ssh -t -l $usr2 $machineC icommand" from machine B

This will work for SSH1, but will fail for SSH2 failing with:
ERR: Pseudo-terminal will not be allocated because stdin is not a terminal.

Machine A has been both a Sun and MacOS, and I see the same failure. My research indicates that Net::SSH::Perl is failing to setup the tty on machine B. Although I'm running an older version of Net::SSH::Perl, I don't see any code in the new version to fix this either.

Test code is attached - using "uname-a" instead of an interactive command, and ssh -t to force the error.

Any thoughts on how I can get this to work with SSH2?

Thanks

-Craig

UPDATE: I was able to modify SSH2.pm to fix this problem. A bug report has been submitted along with my code hacks to SSH2.pm that make it work. 

use strict;
use warnings;

use Net::SSH::Perl;
use Net::SSH::Perl::Constants qw( :msg );

my $host1='machineB';
my $usr1='usrB';
my $pass1='passwdB';

my $host2 = 'machineC';
my $usr2 =  'usrC';
my $cmd = "/opt/exp/bin/ssh -t -l $usr2 $host2 uname -a";

my $debug=0;

my $ssh1 = Net::SSH::Perl->new($host1, use_pty=>1, protocol=>1,
    interactive=>1, debug=>$debug) ||
    die "Cannot conntact target machine, exiting...";

$ssh1->login($usr1, $pass1) ||
    die "Bad login, exiting...";

print STDERR "\n\nUsing SSH1 Protocol\n";
my ($out, $err, $exit) = $ssh1->cmd($cmd);

print STDERR "exit=$exit\n";
print STDERR "OUT: $out\n" if $out;
print STDERR "ERR: $err\n" if $err;

# Using SSH2...

# Adding use_pty=>1 does not work when using SSH2. See:
# http://www.derkeiler.com/Newsgroups/comp.security.ssh/2003-05/0097.h
+tml
my $ssh2 = Net::SSH::Perl->new($host1, protocol=>2, use_pty=>1,
    interactive=>1, debug=>$debug) ||
    die "Cannot conntact target machine, exiting...";

$ssh2->login($usr1, $pass1, 0) ||
    die "Bad login, exiting...";

print STDERR "\n\nUsing SSH2 Protocol\n";
($out, $err, $exit) = $ssh2->cmd($cmd);

print STDERR "exit=$exit\n";
print STDERR "OUT: $out\n" if $out;
print STDERR "ERR: $err\n" if $err;

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In reply to Net::SSH::Perl pty problem with SSH2? SOLVED by cmv

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