socket_recv
Pay attention! On some PHP version the MSG_DONTWAIT flag is not defined (see https://bugs.php.net/bug.php?id=48326)
socket_recvfrom
(PHP 4 >= 4.1.0, PHP 5)
socket_recvfrom — Recebe dados de um socket, conectado ou não
Descrição
int socket_recvfrom
( resource $socket
, string $&buf
, int $len
, int $flags
, string $&name
[, int $&port
] )
Aviso
Esta função é EXPERIMENTAL. O comportamento desta função, seu nome, incluindo toda documentação pode ser modificado sem aviso em futuras versões do PHP. Esta função deve ser usada por sua própria conta e risco.
Aviso
Esta função não está documentada; somente a lista de argumentos está disponível.
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User Contributed Notes
socket_recvfrom
davide dot renzi at gmail dot com
01-Mar-2012 01:52
rmayo100 at yahoo dot com
16-Apr-2010 01:13
I said in my previous note that I'd add a secondary post when I found out more about how to use socket_recvfrom(). So here it is.
As I suspected, the example given is dead-flat-wrong and should be avoided. You WILL need to use pointers like the description at the top of the page says. My working socket_recvfrom() command looks like this:
$bytes = socket_recvfrom ($socket, &$udp_reply, 100, 0, &$from_addr, &$from_port);
Also, even if you have no interest in the the information at all, you must create the $from_addr and $from_port variables and pass them by reference. PHP doesn't support passing in NULL just because you might not give a rat's patootie about the information.... ;)
R.
rmayo100 at yahoo dot com
14-Apr-2010 04:27
The example doesn't match the format described at the top of the page. It appears to me that to use this command to receive UDP data, I need to format my calling parameter as follows:
int socket_recvfrom
(
resource $socket, // Created this with socket_create
string &$buf, // This is a pointer!!
int $len, // I know the amount of data
int $flags, // I know the flags I want
string &$name, // This is ALSO a pointer!
int &$port // This is ALSO a pointer, TOO!!
);
The example doesn't use any pointers, just values, and I didn't think socket_bind was necessary for UDP sockets. At least, it isn't in C. Anybody got a example that does work?? (Because this doesn't see to so far.)
If I do stumble on a combination of settings that works, I'll post it -- but this doesn't seem to be the most active page on PHP.net....
R.
jaggerwang at gmail dot com
07-Nov-2007 02:56
I'm confused about the rerturn value of socket_recvfrom(), it said -1 when failed, but when I call like this:
if (($len = @socket_recvfrom($sock, $result, 32, 0, $ip, $port)) == -1) {
if ($this->_debug) {
echo "socket_read() failed: " . socket_strerror(socket_last_error()) . "\n";
}
return false;
}
variable $len = false, when I change the buffer length from 32 to 4096, it becomes right.
ryan_at_ryanfisher_dot_com
01-Oct-2006 04:27
DNS RELAY USING UDP SOCKETS
<?php
while(TRUE) {
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
if($socket === FALSE)
{
echo 'Socket_create failed: '.socket_strerror(socket_last_error())."\n";
}
if(!socket_bind($socketD, "0.0.0.0", 53)) {
socket_close($socketD);
echo 'socket_bind failed: '.socket_strerror(socket_last_error())."\n";
}
socket_recvfrom($socket,$buf,65535,0,$clientIP,$clientPort);
$stz = bin2hex($buf);
$tx = "";
for($i=0;$i<(strlen($stz)-26-10)/2;$i++)
{
$e = "00";
$e[0] = $stz[$i*2+26];
$e[1] = $stz[$i*2+27];
$f = hexdec($e);
if($f > 0 && $f < 32) $tx .= "."; else
$tx .= sprintf("%c",$f);
}
echo "$clientIP <".$tx.">\n";
$fp = fsockopen("udp://72.174.110.4",53,$errno,$errstr);
if (!$fp)
{
echo "ERROR: $errno - $errstr<br />\n";
}
else
{
fwrite($fp,$buf);
$ret = $buf;
$ret = fread($fp,667);
fclose($fp);
}
}
socket_send($socket,$ret,667,0);
}
?>
tsuna at tsunaquack d0t c0m
21-Feb-2005 08:17
This function is very handy when dealing with UDP connections, because it enables you to know who's the client who connected to your socket. Bear in mind that UDP doesn't care about the source of the connection, the packets may be annonymous or even faked. No check is required.
If you want to listen on an UDP socket and answer to the client, read my comment on socket_listen() -> http://www.php.net/manual/en/function.socket-listen.php