Artur_Stepien

Ok, I thing that created correct packet, packet size seems correct so why server returned result once and then each another request now does not return anything? Here is my corrected code, is something wrong here?: <?php require_once dirname(__FILE__).DIRECTORY_SEPARATOR.'word.class.php'; class Packet { public $words = array(); protected $size = 0; protected $is_request; protected $from_client; /** * Construct packet * * @param bool $is_request * @param bool $is_client * @param string $command */ public function __construct($is_request, $from_client, $command) { $this->is_request = $is_request; $this->from_client = $from_client; $this->size +=4 ; // size of first paremeter (4 bytes integer) $command = trim(preg_replace('!\s+!', ' ', $command)); // remove double spaces $this->size += strlen( str_ireplace(' ', '', $command) ) ; // size of words $this->words = explode(' ',$command); $this->size += count($this->words)*5; // add size of each word size + null byte (5 bytes for each word) $this->size += 4; // add size of packet size $this->size += 4; // size of words count } /** * Return words packet string * * @return String */ protected function getWords(){ $result = ''; foreach($this->words AS $word) { $word = new Word($word); $result.= $word->pack(); } return $result; } /** * Return packet for sending * * @return string */ public function pack() { return pack('C4VV', (int)$this->is_request, (int)$this->from_client, 0, 0, $this->size, count($this->words) ).$this->getWords(); } public function getSize(){ return $this->size; } }

Big thanks for help. This is just learning project to check if communication works. I did created something more based on your code (packet building code) but there is one thing I don't understand in documentation. This first int32 in packet is 4 bytes long but it contains three parameters (this request/response + server/client + sequence counter). How to make it? Here is my code. Your class is in word.class.php file <?php require_once 'word.class.php'; class Packet { public $words = array(); protected $size = 0; protected $is_request; protected $from_client; /** * Construct packet * * @param bool $is_request * @param bool $is_client * @param string $command */ public function __construct($is_request, $from_client, $command) { $this->is_request = $is_request; $this->from_client = $from_client; $this->size +=4 ; // size of first paremeter (4 bytes integer) $command = trim(preg_replace('!\s+!', ' ', $command)); // remove double spaces $this->size += strlen( str_ireplace(' ', '', $command) ) ; // size of words $this->words = explode(' ',$command); $this->size += count($this->words)*4; // add size of each word size (1 byte for each word) $this->size += 4; // add size of packet size $this->size += 4; // size of words count } /** * Return words packet string * * @return String */ protected function getWords(){ $result = ''; foreach($this->words AS $word) { $word = new Word($word); $result.= $word->pack(); } return $result; } /** * Return packet for sending * * @return string */ public function pack() { return pack('VVV', 0, $this->size, count($this->words) ).$this->getWords(); } }

Welcome, I try to build interface to communicate with an application (remote console) using its own protocol and php sockets. Problem is that I have huge experience using most of php librariers and functions but no experience with using pack at all, not mention to create packets using it. Second problem is that application does not respond if packet does not have proper format. I tried to build something using that pack function and its documentation but packet is more complicated then I thought. Can some one show me how to build proper packet using format on page 2 of this document or at least explain how to do it properly?