#!/usr/bin/perl -T

use strict;
use warnings;

use lib qw(.);
use PVE::Firewall;

use PVE::SafeSyslog;
use PVE::Cluster;
use PVE::INotify;
use PVE::RPCEnvironment;

use PVE::JSONSchema qw(get_standard_option);

use PVE::CLIHandler;

use base qw(PVE::CLIHandler);

$ENV{'PATH'} = '/sbin:/bin:/usr/sbin:/usr/bin';

initlog ('pvefw');

die "please run as root\n" if $> != 0;

PVE::INotify::inotify_init();

my $rpcenv = PVE::RPCEnvironment->init('cli');

$rpcenv->init_request();
$rpcenv->set_language($ENV{LANG});
$rpcenv->set_user('root@pam');

__PACKAGE__->register_method ({
    name => 'compile',
    path => 'compile',
    method => 'POST',
    description => "Compile amd print firewall rules. This is only for testing.",
    parameters => {
    	additionalProperties => 0,
	properties => {
	    verbose => {
		description => "Verbose output.",
		type => "boolean",
		optional => 1,
	    },
	},
    },
    returns => { type => 'null' },

    code => sub {
	my ($param) = @_;

	my $rpcenv = PVE::RPCEnvironment::get();

	$param->{verbose} = 1 
	    if !defined($param->{verbose}) && ($rpcenv->{type} eq 'cli');

	my $code = sub {
	    my $ruleset = PVE::Firewall::compile();
	    PVE::Firewall::get_ruleset_status($ruleset, 1) if $param->{verbose};
	};

	PVE::Firewall::run_locked($code);

	return undef;
    }});

__PACKAGE__->register_method ({
    name => 'status',
    path => 'status',
    method => 'GET',
    description => "Get firewall status.",
    parameters => {
    	additionalProperties => 0,
	properties => {},
    },
    returns => { 
	type => 'object',
	additionalProperties => 0,
	properties => {
	    status => {
		type => 'string',
		enum => ['unknown', 'stopped', 'active'],
	    },
	    changes => {
		description => "Set when there are pending changes.",
		type => 'boolean',
		optional => 1,
	    }
	},
    },
    code => sub {
	my ($param) = @_;

	my $rpcenv = PVE::RPCEnvironment::get();

	$param->{verbose} = 1 
	    if !defined($param->{verbose}) && ($rpcenv->{type} eq 'cli');

	my $code = sub {
	    my $status = PVE::Firewall::read_pvefw_status();

	    my $res = { status => $status };
	    if ($status eq 'active') {
		my $ruleset = PVE::Firewall::compile();
		my $cmdlist = PVE::Firewall::get_rulset_cmdlist($ruleset);

		if ($cmdlist ne "*filter\nCOMMIT\n") {
		    $res->{changes} = 1;
		}
	    } 

	    return $res;
	};

	return PVE::Firewall::run_locked($code);
    }});

__PACKAGE__->register_method ({
    name => 'start',
    path => 'start',
    method => 'POST',
    description => "Start (or simply update if already active) firewall.",
    parameters => {
    	additionalProperties => 0,
	properties => {
	    verbose => {
		description => "Verbose output.",
		type => "boolean",
		optional => 1,
		default => 0,
	    },
	},
    },
    returns => { type => 'null' },

    code => sub {
	my ($param) = @_;

	PVE::Firewall::update(1, $param->{verbose});

	return undef;
    }});

__PACKAGE__->register_method ({
    name => 'update',
    path => 'update',
    method => 'POST',
    description => "Check firewall rules. Then update the rules if the firewall is active.",
    parameters => {
    	additionalProperties => 0,
	properties => {
	    verbose => {
		description => "Verbose output.",
		type => "boolean",
		optional => 1,
		default => 0,
	    },
	},
    },
    returns => { type => 'null' },

    code => sub {
	my ($param) = @_;

	PVE::Firewall::update(0, $param->{verbose});

	return undef;
    }});

__PACKAGE__->register_method ({
    name => 'stop',
    path => 'stop',
    method => 'POST',
    description => "Stop firewall. This will remove all rules installed by this script. The host is then unprotected.",
    parameters => {
    	additionalProperties => 0,
	properties => {},
    },
    returns => { type => 'null' },

    code => sub {
	my ($param) = @_;

	my $code = sub {

	    my $chash = PVE::Firewall::iptables_get_chains();
	    my $cmdlist = "*filter\n";
	    my $rule = "INPUT -j PVEFW-INPUT";
	    if (PVE::Firewall::iptables_rule_exist($rule)) {
		$cmdlist .= "-D $rule\n";
	    }
	    $rule = "OUTPUT -j PVEFW-OUTPUT";
	    if (PVE::Firewall::iptables_rule_exist($rule)) {
		$cmdlist .= "-D $rule\n";
	    }

	    $rule = "FORWARD -j PVEFW-FORWARD";
	    if (PVE::Firewall::iptables_rule_exist($rule)) {
		$cmdlist .= "-D $rule\n";
	    }

	    foreach my $chain (keys %$chash) {
		$cmdlist .= "-F $chain\n";
	    }
	    foreach my $chain (keys %$chash) {
		$cmdlist .= "-X $chain\n";
	    }
	    $cmdlist .= "COMMIT\n";

	    PVE::Firewall::iptables_restore_cmdlist($cmdlist);

	    PVE::Firewall::save_pvefw_status('stopped');
	};

	PVE::Firewall::run_locked($code);

	return undef;
    }});

my $nodename = PVE::INotify::nodename();

my $cmddef = {
    compile => [ __PACKAGE__, 'compile', []],
    start => [ __PACKAGE__, 'start', []],
    update => [ __PACKAGE__, 'update', []],
    status => [ __PACKAGE__, 'status', [], undef, sub {
	my $res = shift;
	if ($res->{changes}) {
	    print "Status: $res->{status} (pending changes)\n";
	} else {
	    print "Status: $res->{status}\n";
	}
    }],
    stop => [ __PACKAGE__, 'stop', []],
};

my $cmd = shift;

PVE::CLIHandler::handle_cmd($cmddef, "pvefw", $cmd, \@ARGV, undef, $0);

exit(0);