flightgear/scripts/perl/examples/telnet.pl

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Perl
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2022-10-20 20:29:11 +08:00
#!/usr/bin/perl
#
# Written by Curtis L. Olson, started December 2002
# Some code portions courtesy of Melchior FRANZ
#
# This file is in the Public Domain and comes with no warranty.
#
# $Id$
# ----------------------------------------------------------------------------
use IO::Socket;
use strict;
sub my_not() {
my( $val ) = shift;
if ( $val eq "true" ) {
return 0;
} elsif ( $val eq "false" ) {
return 1;
} elsif ( $val eq "" ) {
return 1;
} else {
return 0;
}
}
sub get_prop() {
my( $handle ) = shift;
&send( $handle, "get " . shift );
eof $handle and die "\nconnection closed by host";
$_ = <$handle>;
s/\015?\012$//;
/^-ERR (.*)/ and die "\nfgfs error: $1\n";
return $_;
}
sub set_prop() {
my( $handle ) = shift;
my( $prop ) = shift;
my( $value ) = shift;
&send( $handle, "set $prop $value");
# eof $handle and die "\nconnection closed by host";
}
sub send() {
my( $handle ) = shift;
print $handle shift, "\015\012";
}
sub connect() {
my( $host ) = shift;
my( $port ) = shift;
my( $timeout ) = (shift || 120);
my( $socket );
STDOUT->autoflush(1);
while ($timeout--) {
if ($socket = IO::Socket::INET->new( Proto => 'tcp',
PeerAddr => $host,
PeerPort => $port) )
{
$socket->autoflush(1);
return $socket;
}
print "Attempting to connect to $host ... " . $timeout . "\n";
sleep(1);
}
return 0;
}
return 1; # make perl happy