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package Net::SSH;
use strict;
use vars qw($VERSION @ISA @EXPORT_OK $ssh);
use Exporter;
use IPC::Open2;
use IPC::Open3;
@ISA = qw(Exporter);
@EXPORT_OK = qw( ssh issh sshopen2 sshopen3 );
$VERSION = '0.02';
$ssh = "ssh";
=head1 NAME
Net::SSH - Perl extension for secure shell
=head1 SYNOPSIS
use Net::SSH qw(ssh issh sshopen2 sshopen3);
ssh('user@hostname', $command);
issh('user@hostname', $command);
sshopen2('user@hostname', $reader, $writer, $command);
sshopen3('user@hostname', $reader, $writer, $error, $command);
=head1 DESCRIPTION
Simple wrappers around ssh commands.
=head1 SUBROUTINES
=over 4
=item ssh [USER@]HOST, COMMAND [, ARGS ... ]
Calls ssh in batch mode.
=cut
sub ssh {
my($host, @command) = @_;
my @cmd = ($ssh, '-o', 'BatchMode yes', $host, @command);
system(@cmd);
}
=item issh [USER@]HOST, COMMAND [, ARGS ... ]
Prints the ssh command to be executed, waits for the user to confirm, and
(optionally) executes the command.
=cut
sub issh {
my($host, @command) = @_;
my @cmd = ($ssh, $host, @command);
print join(' ', @cmd), "\n";
if ( &_yesno ) {
system(@cmd);
}
}
=item sshopen2 [USER@]HOST, READER, WRITER, COMMAND [, ARGS ... ]
Connects the supplied filehandles to the ssh process (in batch mode).
=cut
sub sshopen2 {
my($host, $reader, $writer, @command) = @_;
open2($reader, $writer, $ssh, '-o', 'Batchmode yes', $host, @command);
}
=item sshopen3 HOST, WRITER, READER, ERROR, COMMAND [, ARGS ... ]
Connects the supplied filehandles to the ssh process (in batch mode).
=cut
sub sshopen3 {
my($host, $writer, $reader, $error, @command) = @_;
open3($writer, $reader, $error, $ssh, '-o', 'Batchmode yes', $host, @command);
}
sub _yesno {
print "Proceed [y/N]:";
my $x = scalar(<STDIN>);
$x =~ /^y/i;
}
=back
=head1 EXAMPLE
use Net::SSH qw(sshopen2);
use strict;
my $user = "username";
my $host = "hostname";
my $cmd = "command";
sshopen2("$user\@$host", *READER, *WRITER, "$cmd") || die "ssh: $!";
while (<READER>) {
chomp();
print "$_\n";
}
close(READER);
close(WRITER);
=head1 FREQUENTLY ASKED QUESTIONS
Q: How do you supply a password to connect with ssh within a perl script
using the Net::SSH module?
A: You don't. Use RSA or DSA keys. See the ssh-keygen(1) manpage.
Q: My script is "leaking" ssh processes.
A: See L<perlfaq8/"How do I avoid zombies on a Unix system">, L<IPC::Open2>,
L<IPC::Open3> and L<perlfunc/waitpid>.
=head1 AUTHOR
Ivan Kohler <ivan-netssh_pod@420.am>
=head1 CREDITS
John Harrison <japh@in-ta.net> contributed an example for the documentation.
=head1 BUGS
Not OO.
Look at IPC::Session (also fsh)
=head1 SEE ALSO
ssh-keygen(1), ssh(1), L<IPC::Open2>, L<IPC::Open3>
=cut
1;
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