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[WebSocket] Frame overflow

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This commit is contained in:
Chris Boden 2012-06-02 21:11:29 -04:00
parent 291bd5da5a
commit 7790ef39a1
3 changed files with 53 additions and 80 deletions
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77
src/Ratchet/WebSocket/Version/RFC6455.php
View File

@ -6,6 +6,7 @@ use Guzzle\Http\Message\Response;
/**
* @link http://tools.ietf.org/html/rfc6455
* @todo Unicode: return mb_convert_encoding(pack("N",$u), mb_internal_encoding(), 'UCS-4BE');
*/
class RFC6455 implements VersionInterface {
const GUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
@ -65,88 +66,12 @@ class RFC6455 implements VersionInterface {
}
/**
* Thanks to @lemmingzshadow for the code on decoding a HyBi-10 frame
* @link https://github.com/lemmingzshadow/php-websocket
* @todo look into what happens when false is returned here
* @todo This is needed when a client is created - needs re-write as missing parts of protocol
* @param string
* @return string
*/
public function frame($message, $mask = true) {
return RFC6455\Frame::create($message)->data;
$payload = $message;
$type = 'text';
$masked = $mask;
$frameHead = array();
$frame = '';
$payloadLength = strlen($payload);
switch($type) {
case 'text':
// first byte indicates FIN, Text-Frame (10000001):
$frameHead[0] = 129;
break;
case 'close':
// first byte indicates FIN, Close Frame(10001000):
$frameHead[0] = 136;
break;
case 'ping':
// first byte indicates FIN, Ping frame (10001001):
$frameHead[0] = 137;
break;
case 'pong':
// first byte indicates FIN, Pong frame (10001010):
$frameHead[0] = 138;
break;
}
// set mask and payload length (using 1, 3 or 9 bytes)
if($payloadLength > 65535) {
$payloadLengthBin = str_split(sprintf('%064b', $payloadLength), 8);
$frameHead[1] = ($masked === true) ? 255 : 127;
for($i = 0; $i < 8; $i++) {
$frameHead[$i+2] = bindec($payloadLengthBin[$i]);
}
// most significant bit MUST be 0 (return false if to much data)
if($frameHead[2] > 127) {
return false;
}
} elseif($payloadLength > 125) {
$payloadLengthBin = str_split(sprintf('%016b', $payloadLength), 8);
$frameHead[1] = ($masked === true) ? 254 : 126;
$frameHead[2] = bindec($payloadLengthBin[0]);
$frameHead[3] = bindec($payloadLengthBin[1]);
} else {
$frameHead[1] = ($masked === true) ? $payloadLength + 128 : $payloadLength;
}
// convert frame-head to string:
foreach(array_keys($frameHead) as $i) {
$frameHead[$i] = chr($frameHead[$i]);
} if($masked === true) {
// generate a random mask:
$mask = array();
for($i = 0; $i < 4; $i++)
{
$mask[$i] = chr(rand(0, 255));
}
$frameHead = array_merge($frameHead, $mask);
}
$frame = implode('', $frameHead);
// append payload to frame:
$framePayload = array();
for($i = 0; $i < $payloadLength; $i++) {
$frame .= ($masked === true) ? $payload[$i] ^ $mask[$i % 4] : $payload[$i];
}
return $frame;
}
/**

22
src/Ratchet/WebSocket/Version/RFC6455/Frame.php
View File

@ -72,6 +72,7 @@ class Frame implements FrameInterface {
}
/**
* Encode the fake binary string to send over the wire
* @param string of 1's and 0's
* @return string
*/
@ -290,4 +291,25 @@ class Frame implements FrameInterface {
return $payload;
}
/**
* Sometimes clients will concatinate more than one frame over the wire
* This method will take the extra bytes off the end and return them
* @todo Consider returning new Frame
* @return string
*/
public function extractOverflow() {
if ($this->isCoalesced()) {
$endPoint = $this->getPayloadLength();
$endPoint += $this->getPayloadStartingByte();
if ($this->_bytes_rec > $endPoint) {
$overflow = substr($this->data, $endPoint);
$this->data = substr($this->data, 0, $endPoint);
return $overflow;
}
}
return '';
}
}

30
tests/Ratchet/Tests/WebSocket/Version/RFC6455/FrameTest.php
View File

@ -241,8 +241,6 @@ class FrameTest extends \PHPUnit_Framework_TestCase {
* @dataProvider UnframeMessageProvider
*/
public function testCheckPiecingTogetherMessage($msg, $encoded) {
// return $this->markTestIncomplete('Ran out of time, had to attend to something else, come finish me!');
$framed = base64_decode($encoded);
for ($i = 0, $len = strlen($framed);$i < $len; $i++) {
$this->_frame->addBuffer(substr($framed, $i, 1));
@ -265,6 +263,34 @@ class FrameTest extends \PHPUnit_Framework_TestCase {
$this->assertEquals($pl, $frame->getPayload());
}
public function testExtractOverflow() {
$string1 = $this->generateRandomString();
$frame1 = Frame::create($string1);
$string2 = $this->generateRandomString();
$frame2 = Frame::create($string2);
$cat = new Frame;
$cat->addBuffer($frame1->data . $frame2->data);
$this->assertEquals($string1, $cat->getPayload());
$uncat = new Frame;
$uncat->addBuffer($cat->extractOverflow());
$this->assertEquals($string1, $cat->getPayload());
$this->assertEquals($string2, $uncat->getPayload());
}
public function testEmptyExtractOverflow() {
$string = $this->generateRandomString();
$frame = Frame::create($string);
$this->assertEquals($string, $frame->getPayload());
$this->assertEquals('', $frame->extractOverflow());
$this->assertEquals($string, $frame->getPayload());
}
protected function generateRandomString($length = 10, $addSpaces = true, $addNumbers = true) {
$characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"$%&/()=[]{}'; // ยง