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package Net::CLI::Interact::Transport::Role::ConnectCore;
{
$Net::CLI::Interact::Transport::Role::ConnectCore::VERSION = '2.143070';
}
use Moo::Role;
use MooX::Types::MooseLike::Base qw(Int);
use Net::Telnet ();
sub connect_core {
my $self = shift;
if ($self->use_net_telnet_connection) {
my $app = shift; # unused
return $self->_via_native(@_);
}
else {
return $self->_via_spawn(@_);
}
}
sub _via_native {
my $self = shift;
my $t = Net::Telnet->new(Cmd_remove_mode => 1, @_);
return $t;
}
sub _via_spawn {
my $self = shift;
my $t = Net::Telnet->new(
Binmode => 1,
Cmd_remove_mode => 1,
Telnetmode => 0,
);
$t->fhopen( $self->_spawn_command(@_) )
or die "failed to spawn connection to target device.";
return $t;
}
# this code is based on that in Expect.pm, and found to be the most reliable.
# minor alterations to use CORE::close and die, and to reap child.
use FileHandle;
use IO::Pty;
use POSIX qw(WNOHANG);
has 'childpid' => (
is => 'rw',
isa => Int,
);
sub REAPER {
# http://www.perlmonks.org/?node_id=10516
my $stiff;
1 while (($stiff = waitpid(-1, &WNOHANG)) > 0);
$SIG{CHLD} = \&REAPER;
}
sub _spawn_command {
my $self = shift;
my @command = @_;
my $pty = IO::Pty->new();
# try to install handler to reap children
$SIG{CHLD} = \&REAPER
if !defined $SIG{CHLD};
# set up pipe to detect childs exec error
my ($stat_rdr, $stat_wtr);
pipe($stat_rdr, $stat_wtr) or die "Cannot open pipe: $!";
$stat_wtr->autoflush(1);
eval {
fcntl($stat_wtr, F_SETFD, FD_CLOEXEC);
};
my $pid = fork;
if (! defined ($pid)) {
die "Cannot fork: $!" if $^W;
return undef;
}
if($pid) { # parent
my $errno;
CORE::close $stat_wtr;
$pty->close_slave();
$pty->set_raw();
# now wait for child exec (eof due to close-on-exit) or exec error
my $errstatus = sysread($stat_rdr, $errno, 256);
die "Cannot sync with child: $!" if not defined $errstatus;
CORE::close $stat_rdr;
if ($errstatus) {
$! = $errno+0;
die "Cannot exec(@command): $!\n" if $^W;
return undef;
}
# store pid for killing if we're in cygwin
$self->childpid( $pid );
}
else { # child
CORE::close $stat_rdr;
$pty->make_slave_controlling_terminal();
my $slv = $pty->slave()
or die "Cannot get slave: $!";
$slv->set_raw();
CORE::close($pty);
CORE::close(STDIN);
open(STDIN,"<&". $slv->fileno())
or die "Couldn't reopen STDIN for reading, $!\n";
CORE::close(STDOUT);
open(STDOUT,">&". $slv->fileno())
or die "Couldn't reopen STDOUT for writing, $!\n";
CORE::close(STDERR);
open(STDERR,">&". $slv->fileno())
or die "Couldn't reopen STDERR for writing, $!\n";
{ exec(@command) };
print $stat_wtr $!+0;
die "Cannot exec(@command): $!\n";
}
return $pty;
}
1;
|
