summaryrefslogtreecommitdiff
path: root/lib/Kolab/FreeBusy/Utils.php
blob: 3fea324769521a27ff4ff09e5931d343b467ef6d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
<?php

/**
 * This file is part of the Kolab Server Free/Busy Service
 *
 * @author Thomas Bruederli <bruederli@kolabsys.com>
 *
 * Copyright (C) 2013, Kolab Systems AG <contact@kolabsys.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

namespace Kolab\FreeBusy;

/**
 * Static calss providing utility functions for the Free/Busy service
 */
class Utils
{
	/**
	 * Resolve the given directory to a real path ending with $append
	 *
	 * @param string Arbitrary directory directory path
	 * @param string Make path end with this string/character
	 * @return string Absolute file system path
	 */
	public static function abspath($dirname, $append = '')
	{
		if ($dirname[0] != '/')
			$dirname = realpath(KOLAB_FREEBUSY_ROOT . '/' . $dirname);

		return rtrim($dirname, '/') . $append;
	}

	/**
	 * Returns remote IP address and forwarded addresses if found
	 *
	 * @return string Remote IP address(es)
	 */
	public static function remoteIP()
	{
		$address = $_SERVER['REMOTE_ADDR'];

		// use the NGINX X-Real-IP header, if set
		if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
			$address = $_SERVER['HTTP_X_REAL_IP'];
		}
		// use the X-Forwarded-For header, if set
		if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$address = $_SERVER['HTTP_X_FORWARDED_FOR'];
		}

		return $address;
	}


	/**
	 * Checks if the given IP address is in one of the provided ranges
	 *
	 * @param string   IP address
	 * @param array    List of IP ranges/subnets to check against
	 * @return boolean True if in range, False if not
	 */
	public static function checkIPRange($ip, $ranges)
	{
		$ipv6 = strpos($ip, ':') !== false;
		$ipbin = $ipv6 ? self::ip6net2bits($ip) : ip2long($ip);

		foreach ((array)$ranges as $range) {
			// don't compare IPv4 and IPv6 addresses/ranges
			$rangev6 = strpos($range, ':') !== false;
			if ($ipv6 != $rangev6) {
				continue;
			}

			// quick substring check (e.g. 192.168.0.)
			if (( $ipv6 && strpos($ipbin, self::ip6net2bits($range)) === 0) ||
				(!$ipv6 && strpos($ip, rtrim($range, '*')) === 0)) {
				return true;
			}

			// range from-to specified (IPv4 only)
			list($lower, $upper) = explode('-', $range);
			if (strlen($upper) && !$ipv6) {
				if ($ipbin >= ip2long(trim($lower)) && $ipbin <= ip2long(trim($upper))) {
					return true;
				}
			}

			// subnet/length is given
			list($subnet, $bits) = explode('/', $range);

			// IPv6 subnet
			if (strlen($bits) && $ipv6) {
				$subnetbin = self::ip6net2bits($subnet);
				if (substr($ipbin, 0, $bits) === substr($subnetbin, 0, $bits)) {
					return true;
				}
			}
			// IPv4 subnet
			else if (strlen($bits)) {
				$subnet = ip2long($subnet);
				$mask = -1 << $bits;
				$subnet &= $mask;  // just in case the supplied subnet wasn't correctly aligned
				if (($ipbin & $mask) == $subnet) {
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Convert the given IPv6 address to a binary string representation.
	 * (from http://stackoverflow.com/questions/7951061/matching-ipv6-address-to-a-cidr-subnet)
	 */
	public static function ip6net2bits($inet)
	{
		$binaryip = '';
		$unpacked = @unpack('A16', inet_pton($inet));
		foreach (str_split($unpacked[1]) as $char) {
			$binaryip .= str_pad(decbin(ord($char)), 8, '0', STR_PAD_LEFT);
		}
		return $binaryip;
	}

}