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stream_socket_recvfrom

(PHP 5)

stream_socket_recvfromReceives data from a socket, connected or not

说明

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

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

$server  stream_socket_server ( 'tcp://127.0.0.1:1234' );


$socket  stream_socket_accept ( $server );


echo  "Received Out-Of-Band: '"  stream_socket_recvfrom ( $socket 1500 STREAM_OOB ) .  "'\n" ;


echo  "Data: '"  stream_socket_recvfrom ( $socket 1500 STREAM_PEEK ) .  "'\n" ;


echo  "Data: '"  stream_socket_recvfrom ( $socket 1500 ) .  "'\n" ;


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

用户评论:

[#1] raat1979 at gmail dot com [2015-07-07 08:30:58]

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_INETSTREAM_SOCK_STREAMSTREAM_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_INETSTREAM_SOCK_STREAMSTREAM_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

[#2] MagicalTux at php dot net [2011-02-15 23:13:34]

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()

[#3] cweiske at php dot net [2010-02-28 05:42:43]

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.

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