<?php
/*
	ftpproxy.inc
	part of pfSense (https://www.pfSense.org/)
	Copyright (C) 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.

*/
function sync_package_ftpproxy() {
	conf_mount_rw();
	global $config;
	$cf = $config['installedpackages']['ftpclientproxy']['config'][0];

	/* Proxy is not enabled, kill the daemon and issue a filter reload. */
	if ($cf["proxy_enable"] != "on") {
		mwexec("/usr/bin/killall -9 ftp-proxy");
		filter_configure();
		return;
	}
	$interface_list = explode(",", $cf['localints']);
	/* Bail if there is nothing to do */
	if (empty($interface_list)) {
		log_error("FTP Proxy cannot sync: No interfaces selected.");
		return;
	}

	$start = "/usr/bin/killall -9 ftp-proxy\n";
	$start .= "\t/usr/sbin/ftp-proxy ";

	if ($cf["anononly"] == "on") {
		$start .= " -A ";
	}
	if (is_ipaddr($cf["sourceaddr"])) {
		$start .= " -a " . escapeshellarg($cf["sourceaddr"]);
	}
	if (is_port($cf["bindport"])) {
		$start .= " -p " . escapeshellarg($cf["bindport"]);
	}
	if (is_numeric($cf["maxessions"]) && ($cf["maxessions"] >= 1) && ($cf["maxessions"] <= 500)) {
		$start .= " -m " . escapeshellarg($cf["maxessions"]);
	}
	if (!empty($cf["tsq"])) {
		$start .= " -q " . escapeshellarg($cf["tsq"]);
	}
	if ($cf["src20"] == "on") {
		$start .= " -r ";
	}
	if (is_numeric($cf["idletimeout"]) && ($cf["idletimeout"] > 0) && ($cf["idletimeout"] <= 86400)) {
		$start .= " -t " . escapeshellarg($cf["idletimeout"]);
	}
	if ($cf["log"] == "on") {
		$start .= " -v ";
	}
	$start .= "\n";

	write_rcfile(array(
			"file" => "ftp-proxy.sh",
			"start" => $start,
			"stop" => "/usr/bin/killall -9 ftp-proxy"
		)
	);
	restart_service("ftp-proxy");
	conf_mount_ro();
	filter_configure();
}

function validate_form_ftpproxy($post, &$input_errors) {
	if (empty($post["localints"])) {
		$input_errors[] = 'One or more Local Interfaces must be selected';
	}
	if (!empty($post["sourceaddr"]) && !is_ipaddr($post["sourceaddr"])) {
		$input_errors[] = 'You must specify a valid ip address in the \'Source Address\' field';
	}
	if (!empty($post["bindport"]) && !is_port($post["bindport"])) {
		$input_errors[] = 'You must specify a valid port number in the \'Bind Port\' field';
	}
	if (!empty($post["maxessions"]) && (!is_numeric($post["maxessions"]) || ($post["maxessions"] < 1) || ($post["maxessions"] > 500))) {
		$input_errors[] = 'You must specify a valid number in the \'Max Sessions\' field (Between 1 and 500)';
	}
	if (!empty($post["idletimeout"]) && (is_numeric($post["idletimeout"]) || ($post["idletimeout"] <= 0) || ($post["idletimeout"] > 86400))) {
		$input_errors[] = 'You must specify a valid number in the \'Idle Timeout\' field (Between 1 and 86400)';
	}
	if (!empty($post["bypasssrc"]) && !(is_alias($post["bypasssrc"]) || is_subnetv4($post["bypasssrc"]) || is_ipaddr($post["bypasssrc"]))) {
		$input_errors[] = 'You must specify a valid IP address or alias for Proxy Bypass: Source';
	}
	if (!empty($post["bypassdst"]) && !(is_alias($post["bypassdst"]) || is_subnetv4($post["bypassdst"]) || is_ipaddr($post["bypassdst"]))) {
		$input_errors[] = 'You must specify a valid IP address or alias for Proxy Bypass: Destination';
	}
}

function ftpproxy_get_port() {
	global $config;
	$cf = $config['installedpackages']['ftpclientproxy']['config'][0];
	if (!empty($cf["bindport"]) && is_port($cf["bindport"])) {
		return $cf["bindport"];
	} else {
		return 8021;
	}
}

function ftpproxy_generate_rules($type) {
	global $config;
	$cf = $config['installedpackages']['ftpclientproxy']['config'][0];
	$interface_list = explode(",", $cf['localints']);

	/* Proxy is not enabled, therefore, no rules/anchors. */
	if ($cf["proxy_enable"] != "on") {
		return;
	}

	/* Bail if there is nothing to do */
	if (empty($interface_list)) {
		log_error("FTP Proxy cannot sync: No interfaces selected.");
		return;
	}

	$rules = "";
	switch ($type) {
		case "nat":
			$rules .= "nat-anchor \"ftp-proxy/*\"\n";
			$rules .= "rdr-anchor \"ftp-proxy/*\"\n";

			foreach ($interface_list as $interface_friendly) {
				if (empty($interface_friendly)) {
					continue;
				}
				$interface = get_real_interface($interface_friendly);
				if (empty($interface)) {
					continue;
				}
				if (is_subnetv4($cf["bypasssrc"]) || is_ipaddr($cf["bypasssrc"])) {
					$rules .= "no rdr on {$interface} inet proto tcp from {$cf['bypasssrc']} to any port 21\n";
				} elseif (is_alias($cf["bypasssrc"])) {
					$rules .= "no rdr on {$interface} inet proto tcp from \${$cf['bypasssrc']} to any port 21\n";
				}
				if (is_subnetv4($cf["bypassdst"]) || is_ipaddr($cf["bypassdst"])) {
					$rules .= "no rdr on {$interface} inet proto tcp from any to {$cf['bypassdst']} port 21\n";
				} elseif (is_alias($cf["bypassdst"])) {
					$rules .= "no rdr on {$interface} inet proto tcp from any to \${$cf['bypassdst']} port 21\n";
				}
				$rules .= "rdr pass on {$interface} inet proto tcp from any to any port 21 -> 127.0.0.1 port " . ftpproxy_get_port() . "\n";
			}
			break;
		case "filter":
			$rules .= "anchor \"ftp-proxy/*\"\n";
			// $rules = "pass out proto tcp from any to any port 21\n";
			break;

	}
	return $rules;
}
?>