Bug #81304 [NEW]: simple socket listen and send scripts transfer incomplete data

From: odarcan at gmail dot com Operating system: linux PHP version: 7.4.21 Package: Sockets related Bug Type: Bug Bug description:simple socket listen and send scripts transfer incomplete data Description: ------------ a simple tcp socket listen loop (1listen.php) that sends 12mb data to whoever connects to port 1234 and writes "cmd" the receiver script connects to localhost:1234 and writes "cmd" and counts the number of bytes received (2receive.php) receives different amount and rarely, but sometimes the correct amount. 1listen.php <?php ini_set('error_reporting', E_ALL ^ E_NOTICE); ini_set('display_errors', 1); set_time_limit (0); $address = '0.0.0.0'; $port = 1234; function o($t,$x="\n"){ //just placebo for echo echo "s_l: $t$x"; } while (1){ $linger = array ('l_linger' => 0, 'l_onoff' => 1); $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_set_option($socket, SOL_SOCKET, SO_LINGER, $linger); $r=socket_bind($socket, $address, $port); if ($r==false){ var_dump($socket); o("Could not bind to address: $address $port"); o("sleeping..."); unset($socket); sleep(1); continue; } $r=socket_listen($socket); if ($r==false){ o("could not listen to socket on $port"); sleep(5); continue; } o("Listening on $address:$port..."); $c=0; while (true){ $msgsocket = socket_accept($socket); socket_set_option($msgsocket, SOL_SOCKET, SO_LINGER, $linger); $received= socket_read($msgsocket,2048,PHP_BINARY_READ); if($received ===false){ echo "socket read error: ".socket_strerror(socket_last_error($msgsock)) . "\n"; sleep(4); continue 2; } o("-----------------------"); if ($received !==""){ $string=trim($received); echo "received: [$string]\n"; $cmd=explode(" ",$string); if ($cmd[0]=="cmd"){ $domain=$cmd[1]; $md5=$cmd[2]; $arr=[]; $n=1; for($a=0;$a<1000;$a++){ for($b=0;$b<1000;$b++){ $arr[$a][$b]=$a;//generate data to send } } $r2=serialize($arr); $l1=strlen($r2); $l2=socket_write($msgsocket,$r2); if ($l2<$l1){ o("incomplete transfer"); } o("wrote $l1 / $l2 bytes"); if ($l2===false){ o("error failure"); } } } socket_close($msgsocket); } socket_close($socket); } shutdown(); ?> 2receive.php <?php $m="cmd"; $r=sendclosetcp("localhost",1234,$m); echo strlen($r); echo "\n"; function o($t,$x="\n"){ global $domain; $computer=""; echo $computer." $t$x"; } function sendclosetcp($ip,$port,$msg){ $clnt_sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp')); $r=socket_connect($clnt_sock, $ip, $port); if ($r==false){ o("could not connect to $ip $port"); return ""; } socket_write($clnt_sock,$msg); $ret=""; while(1){ $buf=@socket_read($clnt_sock, 10000, PHP_BINARY_READ); if (strlen($buf)<19) var_dump($buf); $ret.=$buf; $e=socket_last_error($clnt_sock); if ($buf===false){ o("1 remote host closed the connection $e"); break; } if ($buf==false){ o("2 remote host closed the connection $e"); break; } if ($buf==""){ o("3 remote host closed the connection $e"); break; } if ($buf===""){ o("4 remote host closed the connection $e"); break; } } o("received ".strlen($ret)." bytes"); return $ret; } ?> Test script: --------------- run 1listen.php in one terminal window and 2receive.php in another each time you run 2receive.php it receives different amount of bytes before the connection is closed, I have tried on more than one computer Expected result: ---------------- "sent x bytes" and "received x bytes" should be the same number seemingly randomly for files over a few mbs, the received amount varies and data transfers are incomplete Actual result: -------------- 1listen.php: wrote 11794899 / 11794899 bytes for example 2receive.php: received 11053512 bytes received 8039296 bytes received 9108280 bytes etc. -- Edit bug report at https://bugs.php.net/bug.php?id=81304&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81304&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81304&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81304&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81304&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81304&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81304&r=support Expected behavior: https://bugs.php.net/fix.php?id=81304&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81304&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81304&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81304&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81304&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81304&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81304&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81304&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81304&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81304&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81304&r=mysqlcfg