speedealing /htdocs/includes/net/dns2/socket/streams.php

Language PHP Lines 394
MD5 Hash 7b76db59d8b32cec288ac46a8bee7ae6 Estimated Cost $4,022 (why?)
Repository https://bitbucket.org/speedealing/speedealing.git View Raw File View Project SPDX
  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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * DNS Library for handling lookups and updates. 
 *
 * PHP Version 5
 *
 * Copyright (c) 2010, Mike Pultz <mike@mikepultz.com>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * 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.
 *
 *   * Neither the name of Mike Pultz nor the names of his contributors 
 *     may be used to endorse or promote products derived from this 
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT OWNER OR CONTRIBUTORS 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, STRIC
 * 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.
 *
 * @category  Networking
 * @package   Net_DNS2
 * @author    Mike Pultz <mike@mikepultz.com>
 * @copyright 2010 Mike Pultz <mike@mikepultz.com>
 * @license   http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @version   SVN: $Id: Streams.php 168 2012-09-13 02:01:29Z mike.pultz $
 * @link      http://pear.php.net/package/Net_DNS2
 * @since     File available since Release 0.6.0
 *
 */

/**
 * Socket handling class using the PHP Streams
 *
 * The sockets extension is faster than the stream functions in PHP, but it's
 * not standard. So if the extension is loaded, then the Net_DNS_Socket_Sockets
 * class it used, otherwise, this class it used.
 *   
 * @category Networking
 * @package  Net_DNS2
 * @author   Mike Pultz <mike@mikepultz.com>
 * @license  http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @link     http://pear.php.net/package/Net_DNS2
 * @see      Net_DNS2_Socket
 *
 */
class Net_DNS2_Socket_Streams extends Net_DNS2_Socket
{
    private $_context;

    /**
     * opens a socket connection to the DNS server
     *
     * @return boolean
     * @access public
     *
     */
    public function open()
    {
        //
        // create a list of options for the context 
        //
        $opts = array('socket' => array());
        
        //
        // bind to a local IP/port if it's set
        //
        if (strlen($this->local_host) > 0) {

            $opts['socket']['bindto'] = $this->local_host;
            if ($this->local_port > 0) {

                $opts['socket']['bindto'] .= ':' . $this->local_port;
            }
        }

        //
        // create the context
        //
        $this->_context = @stream_context_create($opts);

        //
        // create socket
        //
        $errno;
        $errstr;

        switch($this->type) {
        case Net_DNS2_Socket::SOCK_STREAM:

            if (Net_DNS2::isIPv4($this->host) == true) {

                $this->sock = @stream_socket_client(
                    'tcp://' . $this->host . ':' . $this->port, 
                    $errno, $errstr, $this->timeout, 
                    STREAM_CLIENT_CONNECT, $this->_context
                );
            } else if (Net_DNS2::isIPv6($this->host) == true) {

                $this->sock = @stream_socket_client(
                    'tcp://[' . $this->host . ']:' . $this->port, 
                    $errno, $errstr, $this->timeout, 
                    STREAM_CLIENT_CONNECT, $this->_context
                );
            } else {

                $this->last_error = 'invalid address type: ' . $this->host;
                return false;
            }

            break;
        
        case Net_DNS2_Socket::SOCK_DGRAM:

            if (Net_DNS2::isIPv4($this->host) == true) {

                $this->sock = @stream_socket_client(
                    'udp://' . $this->host . ':' . $this->port, 
                    $errno, $errstr, $this->timeout, 
                    STREAM_CLIENT_CONNECT, $this->_context
                );
            } else if (Net_DNS2::isIPv6($this->host) == true) {

                $this->sock = @stream_socket_client(
                    'udp://[' . $this->host . ']:' . $this->port, 
                    $errno, $errstr, $this->timeout, 
                    STREAM_CLIENT_CONNECT, $this->_context
                );
            } else {

                $this->last_error = 'invalid address type: ' . $this->host;
                return false;
            }

            break;
            
        default:
            $this->last_error = 'Invalid socket type: ' . $this->type;
            return false;
        }

        if ($this->sock === false) {

            $this->last_error = $errstr;
            return false;
        }

        //
        // set it to non-blocking and set the timeout
        //
        @stream_set_blocking($this->sock, 0);
        @stream_set_timeout($this->sock, $this->timeout);

        return true;
    }

    /**
     * closes a socket connection to the DNS server
     *
     * @return boolean
     * @access public
     *
     */
    public function close()
    {
        if (is_resource($this->sock) === true) {

            @fclose($this->sock);
        }
        return true;
    }

    /**
     * writes the given string to the DNS server socket
     *
     * @param string $data a binary packed DNS packet
     *
     * @return boolean
     * @access public
     *
     */
    public function write($data)
    {
        $length = strlen($data);
        if ($length == 0) {

            $this->last_error = 'empty data on write()';
            return false;
        }

        $read   = null;
        $write  = array($this->sock);
        $except = null;

        //
        // select on write
        //
        switch(@stream_select($read, $write, $except, $this->timeout)) {
        case false:
            $this->last_error = 'failed on stream_select()';
            return false;
            break;
       
        case 0:
            return false;
            break;
            
        default:
            ;
        }

        //
        // if it's a TCP socket, then we need to packet and send the length of the
        // data as the first 16bit of data.
        //        
        if ($this->type == Net_DNS2_Socket::SOCK_STREAM) {

            $s = chr($length >> 8) . chr($length);

            if (@fwrite($this->sock, $s) === false) {

                $this->last_error = 'failed to fwrite() 16bit length';
                return false;
            }
        }

        //
        // write the data to the socket
        //
        $size = @fwrite($this->sock, $data);
        if ( ($size === false) || ($size != $length) ) {
        
            $this->last_error = 'failed to fwrite() packet';
            return false;
        }

        return true;
    }

    /**
     * reads a response from a DNS server
     *
     * @param integer &$size the size of the DNS packet read is passed back
     *
     * @return mixed         returns the data on success and false on error
     * @access public
     *
     */
    public function read(&$size)
    {
        $read   = array($this->sock);
        $write  = null;
        $except = null;

        //
        // make sure our socket is non-blocking
        //
        @stream_set_blocking($this->sock, 0);

        //
        // select on read
        //
        switch(stream_select($read, $write, $except, $this->timeout)) {
        case false:
            $this->last_error = 'error on stream_select()';
            return false;
            break;
            
        case 0:
            return false;
            break;
            
        default:
            ;
        }

        $data = '';
        $length = Net_DNS2_Lookups::DNS_MAX_UDP_SIZE;

        //
        // if it's a TCP socket, then the first two bytes is the length of the DNS
        // packet- we need to read that off first, then use that value for the    
        // packet read.
        //
        if ($this->type == Net_DNS2_Socket::SOCK_STREAM) {
    
            if (($data = fread($this->sock, 2)) === false) {
                
                $this->last_error = 'failed on fread() for data length';
                return false;
            }
        
            $length = ord($data[0]) << 8 | ord($data[1]);
            if ($length < Net_DNS2_Lookups::DNS_HEADER_SIZE) {

                return false;
            }
        }

        //
        // at this point, we know that there is data on the socket to be read,
        // because we've already extracted the length from the first two bytes.
        //
        // so the easiest thing to do, is just turn off socket blocking, and
        // wait for the data.
        //
        @stream_set_blocking($this->sock, 1);

        //
        // read the data from the socket
        //
        $data = '';

        //
        // the streams socket is weird for TCP sockets; it doesn't seem to always
        // return all the data properly; but the looping code I added broke UDP
        // packets- my fault- 
        //
        // the sockets library works much better.
        //
        if ($this->type == Net_DNS2_Socket::SOCK_STREAM) {

            $chunk = '';
            $chunk_size = $length;

            //
            // loop so we make sure we read all the data
            //
            while (1) {

                $chunk = fread($this->sock, $chunk_size);
                if ($chunk === false) {
            
                    $this->last_error = 'failed on fread() for data';
                    return false;
                }

                $data .= $chunk;
                $chunk_size -= strlen($chunk);

                if (strlen($data) >= $length) {
                    break;
                }
            }

        //
        // if it's UDP, ti's a single fixed-size frame, and the streams library
        // doesn't seem to have a problem reading it.
        //
        } else {

            $data = fread($this->sock, $length);
            if ($length === false) {
            
                $this->last_error = 'failed on fread() for data';
                return false;
            }
        }
        
        $size = strlen($data);

        return $data;
    }
}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * c-hanging-comment-ender-p: nil
 * End:
 */
?>
Back to Top