stream_socket_recvfrom

(PHP 5, PHP 7)

stream_socket_recvfrom — Receives data from a socket, connected or not

说明

stream_socket_recvfrom ( resource $socket , int $length [, int $flags = 0 [, string &$address ]] ) : string

stream_socket_recvfrom() accepts data from a remote socket up to length bytes.

参数

socket

The remote socket.

length

The number of bytes to receive from the socket.

flags

The value of flags can be any combination of the following:

**Possible values for `flags`**
`STREAM_OOB`	Process OOB (out-of-band) data.
`STREAM_PEEK`	Retrieve data from the socket, but do not consume the buffer. Subsequent calls to fread() or stream_socket_recvfrom() will see the same data.

address

If address is provided it will be populated with the address of the remote socket.

返回值

Returns the read data, as a string

范例

Example #1 stream_socket_recvfrom() example


<?php
/* Open a server socket to port 1234 on localhost */
$server = stream_socket_server('tcp://127.0.0.1:1234');

/* Accept a connection */
$socket = stream_socket_accept($server);

/* Grab a packet (1500 is a typical MTU size) of OOB data */
echo "Received Out-Of-Band: '" . stream_socket_recvfrom($socket, 1500, STREAM_OOB) . "'\n";

/* Take a peek at the normal in-band data, but don't consume it. */
echo "Data: '" . stream_socket_recvfrom($socket, 1500, STREAM_PEEK) . "'\n";

/* Get the exact same packet again, but remove it from the buffer this time. */
echo "Data: '" . stream_socket_recvfrom($socket, 1500) . "'\n";

/* Close it up */
fclose($socket);
fclose($server);
?>

注释

Note:
If a message received is longer than the length parameter, excess bytes may be discarded depending on the type of socket the message is received from (such as UDP).

Note:
Calls to stream_socket_recvfrom() on socket-based streams, after calls to buffer-based stream functions (like fread() or stream_get_line()) read data directly from the socket and bypass the stream buffer.

参见

stream_socket_sendto() - Sends a message to a socket, whether it is connected or not
stream_socket_client() - Open Internet or Unix domain socket connection
stream_socket_server() - Create an Internet or Unix domain server socket

User Contributed Notes

raat1979 at gmail dot com 07-Jul-2015 08:30


Basically there is currently no real way to determine what the position of the Out of band data is in the tcp/ip stream.



However, it seems that In my current environment (winsock: Windows / PHP 5.3.0) you do not peek beyond the OOB byte unless the buffer is empty

reads do read beyond the OOB data. (I'll check my linux box later)



You should be able to figure out the position of the OOB data by peeking and reading from the regular stream

although it would not be 100% reliable as we do read beyond the OOB data when nothing is in front of it.

depending on the high level protocol it might be possible

to handle the specific "no data in front of out-of-band data" case



<?php

echo "<pre>";

$sockets = stream_socket_pair(STREAM_PF_INET, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);

$reader=$sockets[0];

$writer=$sockets[1];



stream_socket_sendto($writer,"abc");

stream_socket_sendto($writer,"xyZ",STREAM_OOB); // ONLY THE LAST BYTE IS MARKED AS OOB DATA

stream_socket_sendto($writer,"def");



echo "\r\n";

echo "Test 1, Peeking beyond oob when the read buffer becomes empty\r\n";

echo "The data order is 'abcxyZdef'\r\n";

stream_select($r=array($reader), $w=array(), $x=array($reader),5);

echo "has regular:";var_dump(count($r)!==0);

echo "has oobData:";var_dump(count($x)!==0);

echo "<span style='color:blue' >Peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 

echo "<span style='color:green'>Peek (1) OobData:".stream_socket_recvfrom($reader,9,STREAM_OOB|STREAM_PEEK)."</span>\r\n"; 

echo "<span style='color:black'>READ (4) regular:".stream_socket_recvfrom($reader,4)."</span>\r\n"; 

echo "<span style='color:blue' >Peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 

echo "<span style='color:black'>READ (1) regular:".stream_socket_recvfrom($reader,1)."</span>\r\n"; 

echo "<span style='color:blue' >Peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 

// read the OOB data

echo "<span style='color:red'  >READ (9) OobData:".stream_socket_recvfrom($reader,9,STREAM_OOB)."</span>\r\n"; 



echo "<span style='color:blue' >Peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 



fclose($sockets[0]);

fclose($sockets[1]);

echo "</pre>";

?>

outputs:

Test 1, Peeking beyond oob when the read buffer becomes empty

The data order is 'abcxyZdef'

has regular:bool(true)

has oobData:bool(true)

Peek (9) regular:abcxy

Peek (1) OobData:Z

READ (4) regular:abcx

Peek (9) regular:y

READ (1) regular:y

Peek (9) regular:def

READ (9) OobData:Z

Peek (9) regular:def



<?php

echo "<pre>";

$sockets = stream_socket_pair(STREAM_PF_INET, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);

$reader=$sockets[0];

$writer=$sockets[1];



stream_socket_sendto($writer,"Z",STREAM_OOB); // ONLY THE LAST BYTE IS MARKED AS OOB DATA

stream_socket_sendto($writer,"abcxydef");



echo "<hr/>";

echo "\r\n";

echo "Test 2, peek if there is nothing in front of the OOB data\r\n";

echo "The data order is 'Zabcxydef'\r\n";

stream_select($r=array($reader), $w=array(), $x=array($reader),5);

echo "has regular:";var_dump(count($r)!==0);

echo "has oobData:";var_dump(count($x)!==0);

echo "<span style='color:blue'>peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 

echo "<span style='color:red' >Peek (9) OobData:".stream_socket_recvfrom($reader,9,STREAM_OOB)."</span>\r\n"; 

echo "<span style='color:blue'>peek (9) regular:".stream_socket_recvfrom($reader,9,STREAM_PEEK)."</span>\r\n"; 

echo "</pre>";

?>

Outputs: 

Test 2, peek if there is nothing in front of the OOB data

The data order is 'Zabcxydef'

has regular:bool(true)

has oobData:bool(true)

peek (9) regular:abcxydef

Peek (9) OobData:Z

peek (9) regular:abcxydef

MagicalTux at php dot net 15-Feb-2011 11:13


This method may return a peer address not compatible with stream_socket_sendto() if in ipv6.



The ip returned by recvfrom is not within brackets ([]), and has the port appended, which makes it look like ::1:1234. To cut it properly, use strrpos()

cweiske at php dot net 28-Feb-2010 05:42


Note that stream_socket_recvfrom() bypasses stream wrappers including TLS/SSL. While reading from an encrypted stream with fread() will return decrypted data, using stream_socket_recvfrom() will give you the original encrypted bytes.