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#!/usr/bin/perl
#
# Copyright (c) 2013 Michel Ketterle, Steven Schubiger
#
# This file is part of distdns.
#
# distdns 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 3 of the License, or
# (at your option) any later version.
#
# distdns 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 distdns. If not, see <http://www.gnu.org/licenses/>.
use strict;
use warnings;
use CGI ();
use Fcntl ':flock';
use JSON qw(decode_json encode_json);
my $VERSION = '0.04';
#-----------------------
# Start of configuration
#-----------------------
my $json_file = 'data.json';
my $session_file = 'session.dat';
#---------------------
# End of configuration
#---------------------
my $query = CGI->new;
my @params = qw(netz pc name debug init session);
my %params;
foreach my $param (@params) {
$params{$param} = $query->param($param);
}
$params{ip} = $query->remote_addr;
if ($params{debug}) {
$SIG{__DIE__} = sub
{
print $query->header('application/json');
print encode_json({ entries => [], error => $_[0] });
exit;
};
}
if ($params{init}) {
die "Delete server-side $session_file first\n" if -e $session_file;
open(my $fh, '>', $session_file) or die "Cannot open server-side $session_file for writing: $!\n";
print {$fh} "$params{session}\n";
close($fh);
}
else {
open(my $fh, '<', $session_file) or die "Cannot open server-side $session_file for reading: $!\nPerhaps try running --init\n";
my $session = do { local $/; <$fh> };
chomp $session;
close($fh);
die "Session ID mismatch\n" unless $params{session} eq $session;
}
my @missing_params = grep { not defined $params{$_} && length $params{$_} } @params;
if (@missing_params) {
my $missing_params = join ', ', map "'$_'", @missing_params;
die "Incomplete query: param(s) $missing_params missing or not defined\n";
}
my %access;
my $access_file = "$params{netz}.conf";
if (-e $access_file) {
open(my $fh, '<', $access_file) or die "Cannot open $access_file for reading: $!\n";
while (my $line = <$fh>) {
chomp $line;
my ($name, $pc) = split /\s*,\s*/, $line;
push @{$access{$name}}, $pc;
}
close($fh);
}
else {
die "Access file $access_file does not exist\n";
}
if (exists $access{$params{name}} && grep /^$params{pc}$/i, @{$access{$params{name}}}) {
open(my $fh, '+<', $json_file) or die "Cannot open $json_file for read/write: $!\n";
flock($fh, LOCK_EX) or die "Cannot lock $json_file: $!\n";
my $json = do { local $/; <$fh> };
my $data = defined $json && length $json ? decode_json($json) : [];
for (my $i = 0; $i < @$data; $i++) {
if ($params{netz} eq $data->[$i]->{netz}
&& $params{pc} eq $data->[$i]->{pc}
&& $params{name} eq $data->[$i]->{name}) {
splice @$data, $i--, 1;
}
}
push @$data, { map { $_ => $params{$_} } qw(netz pc name ip) };
seek($fh, 0, 0) or die "Cannot seek to start of $json_file: $!\n";
truncate($fh, 0) or die "Cannot truncate $json_file: $!\n";
print {$fh} encode_json($data);
close($fh);
my @data = grep $_->{netz} eq $params{netz}, @$data;
print $query->header('application/json');
print encode_json({ entries => \@data, error => undef });
}
else {
die "Access not permitted\n";
}
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