<?php
/*
	tinc.inc
	part of pfSense (https://www.pfSense.org/)
	Copyright (C) 2012-2015 ESF, LLC
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,
	   this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright
	   notice, this list of conditions and the following disclaimer in the
	   documentation and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.
*/
require_once('config.inc');
require_once('service-utils.inc');
require_once('util.inc');
/* include_once('guiconfig.inc'); is needed for clear_log_file() during package installation while booting.
 * However, guiconfig.inc includes authgui.inc which requires a valid php session_auth() and exits when not found.
 * So we include the function here.
*/
if (!function_exists('clear_log_file')) {

	function clear_log_file($logfile = "/var/log/system.log", $restart_syslogd = true) {
		require_once('system.inc');
		global $config;
		if ($restart_syslogd) {
			exec("/usr/bin/killall syslogd");
		}
		if (isset($config['system']['disablesyslogclog'])) {
			unlink($logfile);
			touch($logfile);
		} else {
			$log_size = isset($config['syslog']['logfilesize']) ? $config['syslog']['logfilesize'] : "511488";
			if (isset($config['system']['usefifolog'])) {
				exec("/usr/sbin/fifolog_create -s {$log_size} " . escapeshellarg($logfile));
			} else {
				exec("/usr/local/sbin/clog -i -s {$log_size} " . escapeshellarg($logfile));
			}
		}
		if ($restart_syslogd) {
			system_syslogd_start();
		}
	}
}

function tinc_save() {
	global $config, $configpath;
	$configpath = '/usr/local/etc/tinc/';

	conf_mount_rw();

	rename("{$configpath}", "{$configpath}.old");
	safe_mkdir("{$configpath}");
	safe_mkdir("{$configpath}/hosts");
	touch("{$configpath}/WARNING-ENTIRE_DIRECTORY_ERASED_ON_SAVE_FROM_GUI");
	if (is_array($config['installedpackages']['tinc']['config'])) {
		$tincconf = &$config['installedpackages']['tinc']['config'][0];
	} else {
		$tincconf = array();
	}

	// No proper config, bail out.
	if (!isset($tincconf['name']) || empty($tincconf['name'])) {
		log_error("[tinc] Cannot configure (name not set). Check your configuration.");
		return;
	}

	$fout = fopen("{$configpath}/tinc.conf", "w");
	fwrite($fout, "name=" . $tincconf['name'] . "\n");
	fwrite($fout, "AddressFamily=" . $tincconf['addressfamily'] . "\n");

	if (!is_array($config['installedpackages']['tinchosts']['config'])) {
		$config['installedpackages']['tinchosts']['config'] = array();
	}
	foreach ($config['installedpackages']['tinchosts']['config'] as $host) {
		if ($host['connect']) {
			fwrite($fout, "ConnectTo=" . $host['name'] . "\n");
		}

		$_output = "Address=" . $host['address'] . "\n";
		$_output .= "Subnet=" . $host['subnet'] . "\n";
		$_output .= base64_decode($host['extra']) . "\n";
		$_output .= base64_decode($host['cert_pub']) . "\n";
		file_put_contents("{$configpath}/hosts/" . $host['name'], $_output);
		if ($host['host_up']) {
			file_put_contents("{$configpath}/hosts/" . $host['name'] . '-up', str_replace("\r", "", base64_decode($host['host_up'])) . "\n");
			chmod("{$configpath}/hosts/" . $host['name'] . '-up', 0744);
		}
		if ($host['host_down']) {
			file_put_contents("{$configpath}/hosts/" . $host['name'] . '-down', str_replace("\r", "", base64_decode($host['host_down'])) . "\n");
			chmod("{$configpath}/hosts/" . $host['name'] . '-down', 0744);
		}
	}
	fwrite($fout, base64_decode($tincconf['extra']) . "\n");
	fclose($fout);

	// Check if we need to generate a new RSA key pair.
	if ($tincconf['gen_rsa']) {
		safe_mkdir("{$configpath}/tmp");
		exec("/usr/local/sbin/tincd -c {$configpath}/tmp -K");
		$tincconf['cert_pub'] = base64_encode(file_get_contents("{$configpath}/tmp/rsa_key.pub"));
		$tincconf['cert_key'] = base64_encode(file_get_contents("{$configpath}/tmp/rsa_key.priv"));
		$tincconf['gen_rsa'] = false;
		$config['installedpackages']['tinc']['config'][0]['cert_pub'] = $tincconf['cert_pub'];
		$config['installedpackages']['tinc']['config'][0]['cert_key'] = $tincconf['cert_key'];
		$config['installedpackages']['tinc']['config'][0]['gen_rsa'] = $tincconf['gen_rsa'];
		rmdir_recursive("{$configpath}/tmp");
		write_config("[tinc] New RSA key pair generated.");
	}

	$_output = "Subnet=" . $tincconf['localsubnet'] . "\n";
	$_output .= base64_decode($tincconf['host_extra']) . "\n";
	$_output .= base64_decode($tincconf['cert_pub']) . "\n";
	file_put_contents("{$configpath}/hosts/" . $tincconf['name'], $_output);
	file_put_contents("{$configpath}/rsa_key.priv", base64_decode($tincconf['cert_key']) . "\n");
	chmod("{$configpath}/rsa_key.priv", 0600);
	if ($tincconf['tinc_up']) {
		$_output = base64_decode($tincconf['tinc_up']) . "\n";
	} else {
		$_output = "ifconfig \$INTERFACE " . $tincconf['localip'] . " netmask " . $tincconf['vpnnetmask'] . "\n";
		$_output .= "ifconfig \$INTERFACE group tinc\n";
	}
	file_put_contents("{$configpath}/tinc-up", $_output);
	chmod("{$configpath}/tinc-up", 0744);
	if ($tincconf['tinc_down']) {
		file_put_contents("{$configpath}/tinc-down", str_replace("\r", "", base64_decode($tincconf['tinc_down'])) . "\n");
		chmod("{$configpath}/tinc-down", 0744);
	}
	if ($tincconf['host_up']) {
		file_put_contents("{$configpath}/host-up", str_replace("\r", "", base64_decode($tincconf['host_up'])) . "\n");
		chmod("{$configpath}/host-up", 0744);
	}
	if ($tincconf['host_down']) {
		file_put_contents("{$configpath}/host-down", str_replace("\r", "", base64_decode($tincconf['host_down'])) . "\n");
		chmod("{$configpath}/host-down", 0744);
	}
	if ($tincconf['subnet_up']) {
		file_put_contents("{$configpath}/subnet-up", str_replace("\r", "", base64_decode($tincconf['subnet_up'])) . "\n");
		chmod("{$configpath}/subnet-up", 0744);
	}
	if ($tincconf['subnet_down']) {
		file_put_contents("{$configpath}/subnet-down", str_replace("\r", "", base64_decode($tincconf['subnet_down'])) . "\n");
		chmod("{$configpath}/subnet-down", 0744);
	}

	$pfs_version = substr(trim(file_get_contents("/etc/version")), 0, 3);
	if ($pfs_version == "2.2") {
		$pbietcpath = '/usr/pbi/tinc-' . php_uname("m") . '/local/etc';
		unlink_if_exists("{$pbietcpath}/tinc");
		symlink($configpath, "{$pbietcpath}/tinc");
	}

	if ($tincconf['enable'] != "") {
		tinc_write_rcfile();
		if (is_service_running("tinc")) {
			restart_service("tinc");
		} else {
			start_service("tinc");
		}
	} else {
		if (is_process_running("tincd")) {
			stop_service("tinc");
		}
		unlink_if_exists("/usr/local/etc/rc.d/tinc.sh");
	}

	rmdir_recursive("/usr/local/etc/tinc.old");
	conf_mount_ro();
}

function tinc_write_rcfile() {
	$rc['file'] = 'tinc.sh';
	$rc['start'] .= "/usr/local/sbin/tincd --config=/usr/local/etc/tinc\n\t";
	$rc['stop'] .= "/usr/local/sbin/tincd --kill \n\t";
	write_rcfile($rc);
}

function tinc_install() {
	global $config;

	safe_mkdir("/usr/local/etc/tinc");
	safe_mkdir("/usr/local/etc/tinc/hosts");
	tinc_write_rcfile();
	unlink_if_exists("/usr/local/etc/rc.d/tincd");
	clear_log_file("/var/log/tinc.log");

	/* Create Interface Group */
	if (!is_array($config['ifgroups']['ifgroupentry'])) {
		$config['ifgroups']['ifgroupentry'] = array();
	}

	$a_ifgroups = &$config['ifgroups']['ifgroupentry'];
	$ifgroupentry = array();
	$ifgroupentry['members'] = '';
	$ifgroupentry['descr'] = 'tinc mesh VPN interface group';
	$ifgroupentry['ifname'] = 'tinc';
	$a_ifgroups[] = $ifgroupentry;

	/* XXX: Do not remove this. WTH?! */
	mwexec("/bin/rm -f /tmp/config.cache");

	write_config("[tinc] Package installed.");
}

function tinc_deinstall() {
	global $config;

	/* Remove Interface Group */
	if (!is_array($config['ifgroups']['ifgroupentry'])) {
		$config['ifgroups']['ifgroupentry'] = array();
	}

	$a_ifgroups = &$config['ifgroups']['ifgroupentry'];

	$myid = -1;
	$i = 0;
	foreach ($a_ifgroups as $ifgroupentry) {
		if ($ifgroupentry['ifname'] == 'tinc') {
			$myid = $i;
			break;
		}
		$i++;
	}

	if ($myid >= 0 && $a_ifgroups[$myid]) {
		$members = explode(" ", $a_ifgroups[$_GET['id']]['members']);
		foreach ($members as $ifs) {
			$realif = get_real_interface($ifs);
			if ($realif) {
				mwexec("/sbin/ifconfig {$realif} -group " . escapeshellarg($a_ifgroups[$_GET['id']]['ifname']));
			}
		}
		unset($a_ifgroups[$myid]);
		/* WTH?! */
		mwexec("/bin/rm -f /tmp/config.cache");
		write_config("[tinc] Package uninstalled.");
	}
	rmdir_recursive("/var/tmp/tinc");
	rmdir_recursive("/usr/local/etc/tinc*");
}

function tinc_validate_input($post, &$input_errors) {
	if ($post['localip']) {
		if ((!is_ipaddr($post['localip'])) && (!is_hostname($post['localip']))) {
			$input_errors[] = gettext("'Local IP' must be a valid IP address or hostname.");
		}
	}
	if ($post['address']) {
		if ((!is_ipaddr($post['address'])) && (!is_hostname($post['address']))) {
			$input_errors[] = gettext("'Host Address' must be a valid IP address or hostname.");
		}
	}
	if (($post['localsubnet']) && (!is_subnet($post['localsubnet']))) {
		$input_errors[] = gettext("'Local Subnet' must be a valid subnet.");
	}
	if (($post['subnet']) && (!is_subnet($post['subnet']))) {
		$input_errors[] = gettext("'Subnet' must be a valid subnet.");
	}
}
?>