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|
##
## Generic data connection package
##
package Net::FTP::dataconn;
use Carp;
use vars qw(@ISA $timeout $VERSION);
use Net::Cmd;
use Errno;
$VERSION = '0.11';
@ISA = qw(IO::Socket::INET);
sub reading
{
my $data = shift;
${*$data}{'net_ftp_bytesread'} = 0;
}
sub abort
{
my $data = shift;
my $ftp = ${*$data}{'net_ftp_cmd'};
# no need to abort if we have finished the xfer
return $data->close
if ${*$data}{'net_ftp_eof'};
# for some reason if we continously open RETR connections and not
# read a single byte, then abort them after a while the server will
# close our connection, this prevents the unexpected EOF on the
# command channel -- GMB
if(exists ${*$data}{'net_ftp_bytesread'}
&& (${*$data}{'net_ftp_bytesread'} == 0)) {
my $buf="";
my $timeout = $data->timeout;
$data->can_read($timeout) && sysread($data,$buf,1);
}
${*$data}{'net_ftp_eof'} = 1; # fake
$ftp->abort; # this will close me
}
sub _close
{
my $data = shift;
my $ftp = ${*$data}{'net_ftp_cmd'};
$data->SUPER::close();
delete ${*$ftp}{'net_ftp_dataconn'}
if exists ${*$ftp}{'net_ftp_dataconn'} &&
$data == ${*$ftp}{'net_ftp_dataconn'};
}
sub close
{
my $data = shift;
my $ftp = ${*$data}{'net_ftp_cmd'};
if(exists ${*$data}{'net_ftp_bytesread'} && !${*$data}{'net_ftp_eof'}) {
my $junk;
$data->read($junk,1,0);
return $data->abort unless ${*$data}{'net_ftp_eof'};
}
$data->_close;
$ftp->response() == CMD_OK &&
$ftp->message =~ /unique file name:\s*(\S*)\s*\)/ &&
(${*$ftp}{'net_ftp_unique'} = $1);
$ftp->status == CMD_OK;
}
sub _select {
my ($data, $timeout, $do_read) = @_;
my ($rin,$rout,$win,$wout,$tout,$nfound);
vec($rin='',fileno($data),1) = 1;
($win, $rin) = ($rin, $win) unless $do_read;
while (1) {
$nfound = select($rout=$rin, $wout=$win, undef, $tout=$timeout);
last if $nfound >= 0;
croak "select: $!"
unless $!{EINTR};
}
$nfound;
}
sub can_read
{
_select(@_[0,1],1);
}
sub can_write
{
_select(@_[0,1],0);
}
sub cmd
{
my $ftp = shift;
${*$ftp}{'net_ftp_cmd'};
}
sub bytes_read {
my $ftp = shift;
${*$ftp}{'net_ftp_bytesread'} || 0;
}
1;
|
