Hello everyone!

Greetings!

Recently, I am using Net::OpenSSH for my work. And I run to this problem...

I created an $ssh object and then fork a lot children processes which use this object.

When the children number is bigger than "MaxSessions" sshd configuration, some children process prompt user for confirming password when no more channels could be created by sshd.

I reviewed the src of Net::OpenSSH _connect method, and did found NumberOfPasswordPrompts parameter, but I don't know if this could affect the multiplexing session of ssh.

What could I do to avoid the password prompt from forked child or am I using this module wrong?

The following lines are my test code.

Any comments is appreciated, thanks for read along this line...

:)

#!/usr/bin/perl 

use strict;
use warnings;

use Net::OpenSSH;

sub link_ssh {
    my $ssh     = shift;
    $ssh->error
      and die "Couldn't establish SSH connection: "
      . $ssh->error . "\n";
    my @lines = $ssh->capture(qq{ps});
    print @lines;
}

sub main {
    my $host = "morya:morya\@10.137.73.214";
    my $ssh = Net::OpenSSH->new( $host );
    my @childs = ();
    # most hosts use MaxSessions=10 as default
    for ( 1 .. 12 ) {
        my $kid = 1;
        $kid = fork;
        push( @childs, $kid ) if ($kid);
        if ( !$kid ) {
            # child process
            eval { link_ssh $ssh, $_; };
            if ($@) {
                print "child $_ ERR $@\n";
            }
            exit;
        }
        
    }
    print "main $$ waiting childs\n";
    
    waitpid( $_, 0 ) foreach @childs;
    return 0;
}

exit(main);

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In reply to fork more than MaxSessions times in Net::OpenSSH by morya

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