1<?php
2/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
3
4/**
5 * DNS Library for handling lookups and updates.
6 *
7 * PHP Version 5
8 *
9 * Copyright (c) 2011, Mike Pultz <mike@mikepultz.com>.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 *   * Redistributions of source code must retain the above copyright
17 *     notice, this list of conditions and the following disclaimer.
18 *
19 *   * Redistributions in binary form must reproduce the above copyright
20 *     notice, this list of conditions and the following disclaimer in
21 *     the documentation and/or other materials provided with the
22 *     distribution.
23 *
24 *   * Neither the name of Mike Pultz nor the names of his contributors
25 *     may be used to endorse or promote products derived from this
26 *     software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
31 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
32 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
34 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
35 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
36 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRIC
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
38 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
40 *
41 * @category  Networking
42 * @package   Net_DNS2
43 * @author    Mike Pultz <mike@mikepultz.com>
44 * @copyright 2011 Mike Pultz <mike@mikepultz.com>
45 * @license   http://www.opensource.org/licenses/bsd-license.php  BSD License
46 * @version   SVN: $Id: URI.php 132 2011-12-03 05:28:54Z mike.pultz $
47 * @link      http://pear.php.net/package/Net_DNS2
48 * @since     File available since Release 1.2.0
49 *
50 */
51
52/**
53 * URI Resource Record - http://tools.ietf.org/html/draft-faltstrom-uri-06
54 *
55 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
56 *    |                   PRIORITY                    |
57 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
58 *    |                    WEIGHT                     |
59 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
60 *    /                    TARGET                     /
61 *    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
62 *
63 * @category Networking
64 * @package  Net_DNS2
65 * @author   Mike Pultz <mike@mikepultz.com>
66 * @license  http://www.opensource.org/licenses/bsd-license.php  BSD License
67 * @link     http://pear.php.net/package/Net_DNS2
68 * @see      Net_DNS2_RR
69 *
70 */
71class Net_DNS2_RR_URI extends Net_DNS2_RR
72{
73    /*
74     * The priority of this target host.
75     */
76    public $priority;
77
78    /*
79     * a relative weight for entries with the same priority
80     */
81    public $weight;
82
83    /*
84      * The domain name of the target host
85     */
86    public $target;
87
88    /**
89     * method to return the rdata portion of the packet as a string
90     *
91     * @return  string
92     * @access  protected
93     *
94     */
95    protected function rrToString()
96    {
97        //
98        // presentation format has double quotes (") around the target.
99        //
100        return $this->priority . ' ' . $this->weight . ' "' .
101            $this->cleanString($this->target) . '"';
102    }
103
104    /**
105     * parses the rdata portion from a standard DNS config line
106     *
107     * @param array $rdata a string split line of values for the rdata
108     *
109     * @return boolean
110     * @access protected
111     *
112     */
113    protected function rrFromString(array $rdata)
114    {
115        $this->priority = $rdata[0];
116        $this->weight   = $rdata[1];
117
118        //
119        // make sure to trim the lead/trailing double quote if it's there.
120        //
121        $this->target   = trim($this->cleanString($rdata[2]), '"');
122
123        return true;
124    }
125
126    /**
127     * parses the rdata of the Net_DNS2_Packet object
128     *
129     * @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet to parse the RR from
130     *
131     * @return boolean
132     * @access protected
133     *
134     */
135    protected function rrSet(Net_DNS2_Packet &$packet)
136    {
137        if ($this->rdlength > 0) {
138
139            //
140            // unpack the priority and weight
141            //
142            $x = unpack('npriority/nweight', $this->rdata);
143
144            $this->priority = $x['priority'];
145            $this->weight   = $x['weight'];
146
147            $offset         = $packet->offset + 4;
148            $this->target   = Net_DNS2_Packet::expand($packet, $offset);
149
150            return true;
151        }
152
153        return false;
154    }
155
156    /**
157     * returns the rdata portion of the DNS packet
158     *
159     * @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet use for
160     *                                 compressed names
161     *
162     * @return mixed                   either returns a binary packed
163     *                                 string or null on failure
164     * @access protected
165     *
166     */
167    protected function rrGet(Net_DNS2_Packet &$packet)
168    {
169        if (strlen($this->target) > 0) {
170
171            $data = pack('nn', $this->priority, $this->weight);
172            $packet->offset += 4;
173
174            $data .= $packet->compress(trim($this->target, '"'), $packet->offset);
175
176            return $data;
177        }
178
179        return null;
180    }
181}
182
183?>
184