#!/usr/bin/perl

# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0.  If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.

# Test whether the interfaces on 10.53.0.* are up.

require 5.001;

use Cwd 'abs_path';
use File::Basename;
use Socket;
use Getopt::Long;

my $port = 0;
my $id = 0;
GetOptions("p=i" => \$port,
           "i=i" => \$id);

my @ids;
if ($id != 0) {
	@ids = ($id);
} else {
	my $dir = dirname(abs_path($0));
	my $fn = "$dir/ifconfig.sh.in";
	open FH, "< $fn" or die "open < $fn: $!\n";
	while (<FH>) {
		@ids = (1..$1)
		    if /^max=(\d+)\s*$/;
	}
	close FH;
	die "could not find max IP address in $fn\n"
	    unless @ids > 1;
}

foreach $id (@ids) {
        my $addr = pack("C4", 10, 53, 0, $id);
	my $sa = pack_sockaddr_in($port, $addr);
	socket(SOCK, PF_INET, SOCK_STREAM, getprotobyname("tcp"))
      		or die "$0: socket: $!\n";
	setsockopt(SOCK, SOL_SOCKET, SO_REUSEADDR, pack("l", 1));

	bind(SOCK, $sa)
	    	or die sprintf("$0: bind(%s, %d): $!\n",
			       inet_ntoa($addr), $port);
	close(SOCK);
}