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Editing File: /usr/share/doc/ifupdown/contrib/ifstate-check

#!/usr/bin/perl
#
# Generate a report of the status of interfaces configured
# by 'ifupdown'
# (c) 2004 Javier Fernandez-Sanguino <jfs@debian.org>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

$statefile="/run/network/ifstate";
$configfile="/etc/network/interfaces";

open (IFACE,"<$configfile") || die ("Could not open $configfile: $!\n");
while (<IFACE>) {
	chomp;
	if ( /^iface\s+(\w+)\s+/ ) {
		$configured{$1}=$_; 
	}
}

close IFACE;

open (IPLINK,"ip link show|") || die ("Could not execute ip: $!\n");
while (<IPLINK>) {
	chomp;
# FORMAT
# #: AAAA: <XXXXX,UP> mtu 16436 qdisc noqueue
	if ( /^\d+: (\w+):.*?\<.*?,UP.*?\>/ ) {
		$iplink{$1}=$_;
	}
}
close IPLINK;

open (STATE,"<$statefile") || die ("Could not open $statefile: $!\n");
$line = 0;
while (<STATE>) {
	chomp;
	$line++;
# Format is IFACE=IFACE
	if ( /^(\w+)=(\w+)$/ ) {
		$iface = $1;
		$ifaces = $2;
		if ( $iface ne $ifaces ) {
			print STDERR "Error in $statefile (line $line), interface names do not match ('$iface' and '$ifaces')\n";
		} else {
			check_status($iface);
		}
	} else {
		print STDERR "Error in $statefile (line $line), unknown content\n";
	}

}
close STATE;

exit 0;

sub check_status {
	my ($int) = @_;
	print "$int: ";
	my $status = "UP";
# Check if it's really up, this is done basically because ifupdown
# might not have configured it properly even if it thinks he has
# (sample: ifconfig croaks when wrong parameters are used and 
# ifupdown does not detect that the system call went awry)
	$status = "ERROR_NOT_REALLY_UP" if ! defined ($iplink{$int}) ;
	if ( defined ( $configured{$int} ) ) {
		$status .= ",CONFIGURED";
	} else {
		$status .= ",MANUALLY_CONFIGURED";
	}
	print "$status\n";
	return 0;
}

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