/usr/share/doc/ifupdown/contrib/ifstate-check is in ifupdown 0.8.19.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | #!/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 basicly 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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