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package Net::SCP;
use strict;
use vars qw($VERSION @ISA @EXPORT_OK $scp);
use Exporter;
use File::Basename;
use String::ShellQuote;
use IO::Handle;
use Net::SSH qw(sshopen3);
@ISA = qw(Exporter);
@EXPORT_OK = qw( scp iscp );
$VERSION = '0.01';
$scp = "scp";
=head1 NAME
Net::SCP - Perl extension for secure copy protocol
=head1 SYNOPSIS
#procedural interface
use Net::SCP qw(scp iscp);
scp($source, $destination);
iscp($source, $destination); #shows command, asks for confirmation, and
#allows user to type a password on tty
#Net::FTP-style
$scp = Net::SCP->new("hostname");
$scp->login("user");
$scp->cwd("/dir");
$scp->size("file");
$scp->get("file");
$scp->quit;
=head1 DESCRIPTION
Simple wrappers around ssh and scp commands.
=head1 SUBROUTINES
=over 4
=item scp SOURCE, DESTINATION
Calls scp in batch mode, with the B<-B> B<-p> B<-q> and B<-r> options.
=cut
sub scp {
my($src, $dest) = @_;
my $flags = '-Bpq';
$flags .= 'r' unless &_islocal($src) && ! -d $src;
my @cmd = ( $scp, $flags, $src, $dest );
system(@cmd);
}
=item iscp SOURCE, DESTINATION
Prints the scp command to be execute, waits for the user to confirm, and
(optionally) executes scp, with the B<-p> and B<-r> flags.
=cut
sub iscp {
my($src, $dest) = @_;
my $flags = '-p';
$flags .= 'r' unless &_islocal($src) && ! -d $src;
my @cmd = ( $scp, $flags, $src, $dest );
print join(' ', @cmd), "\n";
if ( &_yesno ) {
system(@cmd);
}
}
sub _yesno {
print "Proceed [y/N]:";
my $x = scalar(<STDIN>);
$x =~ /^y/i;
}
sub _islocal {
shift !~ /^[^:]+:/
}
=back
=head1 METHODS
=over 4
=item new HOSTNAME
This is the constructor for a new Net::SCP object. Additional parameters
are ignored.
=cut
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {
'host' => shift,
'user' => '',
'cwd' => '',
};
bless($self, $class);
}
=item login [USER]
Compatibility method. Optionally sets the user.
=cut
sub login {
my($self, $user) = @_;
$self->{'user'} = $user;
}
=item cwd CWD
Sets the cwd (used for a subsequent get or put request without a full pathname).
=cut
sub cwd {
my($self, $cwd) = @_;
$self->{'cwd'} = $cwd || '/';
}
=item get REMOTE_FILE [, LOCAL_FILE]
Uses scp to transfer REMOTE_FILE from the remote host. If a local filename is
omitted, uses the basename of the remote file.
=cut
sub get {
my($self, $remote, $local) = @_;
$remote = $self->{'cwd'}. "/$remote" if $self->{'cwd'} && $remote !~ /^\//;
$local ||= basename($remote);
my $source = $self->{'host'}. ":$remote";
$source = $self->{'user'}. '@'. $source if $self->{'user'};
scp($source,$local);
}
=item size FILE
Returns the size in bytes for the given file as stored on the remote server.
(Implementation note: An ssh connection is established to the remote machine
and wc is used to determine the file size. No distinction is currently made
between nonexistant and zero-length files.)
=cut
sub size {
my($self, $file) = @_;
$file = $self->{'cwd'}. "/$file" if $self->{'cwd'} && $file !~ /^\//;
my $host = $self->{'host'};
$host = $self->{'user'}. '@'. $host if $self->{'user'};
my($reader, $writer, $error ) =
( new IO::Handle, new IO::Handle, new IO::Handle );
$writer->autoflush(1);# $error->autoflush(1);
#sshopen2($host, $reader, $writer, 'wc', '-c ', shell_quote($file) );
sshopen3($host, $writer, $reader, $error, 'wc', '-c ', shell_quote($file) );
chomp( my $size = <$reader> || 0 );
if ( $size =~ /^\s+(\d+)/ ) {
$1;
} else {
warn "unparsable output from remote wc";
0;
}
}
=item put LOCAL_FILE [, REMOTE_FILE]
Uses scp to trasnfer LOCAL_FILE to the remote host. If a remote filename is
omitted, uses the basename of the local file.
=cut
sub put {
my($self, $local, $remote) = @_;
$remote ||= basename($local);
$remote = $self->{'cwd'}. "/$remote" if $self->{'cwd'} && $remote !~ /^\//;
my $dest = $self->{'host'}. ":$remote";
$dest = $self->{'user'}. '@'. $dest if $self->{'user'};
warn "scp $local $dest\n";
scp($local, $dest);
}
=item binary
Compatibility method: does nothing; returns true.
=cut
sub binary { 1; }
=back
=head1 AUTHOR
Ivan Kohler <ivan-netscp_pod@420.am>
=head1 BUGS
Not OO.
In order to work around some problems with commercial SSH2, if the source file
is on the local system, and is not a directory, the B<-r> flag is omitted.
It's probably better just to use SSH1 or OpenSSH <http://www.openssh.com/>
The Net::FTP-style OO stuff is kinda lame. And incomplete.
=head1 SEE ALSO
scp(1), ssh(1)
=cut
1;
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