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package IO::Socket::Telnet::HalfDuplex;
use base 'IO::Socket::Telnet';
sub new {
my $class = shift;
my %args = @_;
my $code = delete $args{code} || 99;
my $self = $class->SUPER::new(@_);
${*{$self}}{code} = $code;
$self->telnet_simple_callback(\&telnet_negotiation);
return $self;
}
sub read {
my $self = shift;
my $buffer;
$self->do(chr(${*{$self}}{code}));
${*{$self}}{got_pong} = 0;
eval {
local $SIG{__DIE__};
while (1) {
my $b;
defined $self->recv($b, 4096, 0) and do {
$buffer .= $b;
die "got pong\n" if ${*{$self}}{got_pong};
next;
};
die "Disconnected from server: $!" unless $!{EINTR};
}
};
die $@ if $@ !~ /^got pong\n/;
return $buffer;
}
sub telnet_negotiation {
my $self = shift;
my $option = shift;
my $code = ${*{$self}}{code};
if ($option =~ / $code$/) {
${*{$self}}{got_pong} = 1;
return '';
}
return;
}
1;
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