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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 constant false => 0;
use Config::Tiny;
use Digest::MD5 qw(md5_hex);
use Fcntl ':flock';
use File::Spec::Functions qw(rel2abs);
use Getopt::Long qw(:config no_auto_abbrev no_ignore_case);
use JSON qw(decode_json);
use LWP::UserAgent;
use Sys::Hostname qw(hostname);
use Tie::File;
my $VERSION = '0.04';
#-----------------------
# Start of configuration
#-----------------------
my $config_file = 'dynuser.conf';
my $hosts_file = 'hosts';
my $session_file = 'session.dat';
my $server_url = 'http://refcnt.org/~sts/cgi-bin/ketterle/server.cgi';
#---------------------
# End of configuration
#---------------------
sub usage
{
print <<"USAGE";
Usage: $0
-d, --debug server debugging
-h, --help this help screen
-i, --init initialize session data
USAGE
exit;
}
my %opts;
GetOptions(\%opts, qw(d|debug h|help i|init)) or usage();
usage() if $opts{h};
$config_file = rel2abs($config_file);
$hosts_file = rel2abs($hosts_file);
$session_file = rel2abs($session_file);
my $save_session = sub
{
my ($session) = @_;
open(my $fh, '>', $session_file) or die "Cannot open client-side $session_file for writing: $!\n";
print {$fh} "$session\n";
close($fh);
};
my $get_session = sub
{
open(my $fh, '<', $session_file) or die "Cannot open client-side $session_file for reading: $!\nPerhaps try running --init\n";
my $session = do { local $/; <$fh> };
chomp $session;
close($fh);
return $session;
};
my $session = $opts{i} ? substr(md5_hex(md5_hex(time() . {} . rand() . $$)), 0, 32) : $get_session->();
my $config = Config::Tiny->new;
$config = Config::Tiny->read($config_file);
my ($netz, $name) = @{$config->{data}}{qw(netz name)};
die "$0: Network and/or name not set in $config_file\n" unless defined $netz && defined $name;
my %params = (
netz => $netz,
pc => hostname(),
name => $name,
debug => $opts{d} || false,
init => $opts{i} || false,
session => $session,
);
my $ua = LWP::UserAgent->new;
my $response = $ua->post($server_url, \%params);
if ($response->is_success) {
my $data;
eval {
$data = decode_json($response->decoded_content);
} or exit;
die "$0: $data->{error}" if defined $data->{error};
$save_session->($session) if $opts{i};
my %list;
foreach my $entry (@{$data->{entries}}) {
my $host = "$entry->{ip}\t" . join '.', @$entry{qw(name pc netz)};
push @{$list{$entry->{netz}}}, $host;
}
my $o = tie my @hosts, 'Tie::File', $hosts_file or die "$0: Cannot tie $hosts_file: $!\n";
$o->flock(LOCK_EX);
foreach my $network (keys %list) {
my %indexes;
for (my $i = 0; $i < @hosts; $i++) {
if ($hosts[$i] =~ /^\#$network\#$/i) {
$indexes{start} = $i;
}
elsif (exists $indexes{start} && $hosts[$i] =~ /^\#\/$network\#$/i) {
$indexes{end} = $i;
my $count = ($indexes{end} - $indexes{start} > 1)
? $indexes{end} - $indexes{start} - 1
: 0;
splice @hosts, $indexes{start} + 1, $count, @{$list{$network}};
last;
}
}
}
undef $o;
untie @hosts;
}
else {
warn $response->status_line, "\n";
}
|
