ios - Socket.io 与 PHP websocket 握手？

Question

我在服务器端使用 PHP 网络套接字。我目前只测试客户端和服务器之间的连接，所以我还没有配置套接字来响应特定的事件。这是基本模板的样子:

#!/php -q
<?php  /*  >php -q server.php  */

error_reporting(E_ALL);
set_time_limit(0);
ob_implicit_flush();

$master  = WebSocket("example.com",8080);
$sockets = array($master);
$users   = array();
$debug   = false;

while(true){
  $changed = $sockets;
  socket_select($changed,$write=NULL,$except=NULL,NULL);
  foreach($changed as $socket){
    if($socket==$master){
      $client=socket_accept($master);
      if($client<0){ console("socket_accept() failed"); continue; }
      else{ connect($client); }
    }
    else{
      $bytes = @socket_recv($socket,$buffer,2048,0);
      if($bytes==0){ disconnect($socket); }
      else{
        $user = getuserbysocket($socket);
        if(!$user->handshake){ dohandshake($user,$buffer); }
        else{ process($user,$buffer); }
      }
    }
  }
}

//---------------------------------------------------------------
function process($user,$msg){
  $action = unwrap($msg);
  say("< ".$action);
  switch($action){
case "hello" : send($user->socket,"hello human");                       break;
case "hi"    : send($user->socket,"zup human");                         break;
case "name"  : send($user->socket,"my name is Multivac, silly I know"); break;
case "age"   : send($user->socket,"I am older than time itself");       break;
case "date"  : send($user->socket,"today is ".date("Y.m.d"));           break;
case "time"  : send($user->socket,"server time is ".date("H:i:s"));     break;
case "thanks": send($user->socket,"you're welcome");                    break;
case "bye"   : send($user->socket,"bye");                               break;
default      : send($user->socket,$action." not understood");           break;
  }
}

function send($client,$msg){
  say("> ".$msg);
  $msg = wrap($msg);
  socket_write($client,$msg,strlen($msg));
}

function WebSocket($address,$port){
  $master=socket_create(AF_INET, SOCK_STREAM, SOL_TCP)     or die("socket_create() failed");
  socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1)  or die("socket_option() failed");
  socket_bind($master, $address, $port)                    or die("socket_bind() failed");
  socket_listen($master,20)                                or die("socket_listen() failed");
  echo "Server Started : ".date('Y-m-d H:i:s')."\n";
  echo "Master socket  : ".$master."\n";
  echo "Listening on   : ".$address." port ".$port."\n\n";
  return $master;
}

function connect($socket){
  global $sockets,$users;
  $user = new User();
  $user->id = uniqid();
  $user->socket = $socket;
  array_push($users,$user);
  array_push($sockets,$socket);
  console($socket." CONNECTED!");
}

function disconnect($socket){
  global $sockets,$users;
  $found=null;
  $n=count($users);
  for($i=0;$i<$n;$i++){
    if($users[$i]->socket==$socket){ $found=$i; break; }
  }
  if(!is_null($found)){ array_splice($users,$found,1); }
  $index = array_search($socket,$sockets);
  socket_close($socket);
  console($socket." DISCONNECTED!");
  if($index>=0){ array_splice($sockets,$index,1); }
}

function dohandshake($user,$buffer){
  console("\nRequesting handshake...");
  console($buffer);
  list($resource,$host,$origin,$strkey1,$strkey2,$data) = getheaders($buffer);
  console("Handshaking...");

  $pattern = '/[^\d]*/';
  $replacement = '';
  $numkey1 = preg_replace($pattern, $replacement, $strkey1);
  $numkey2 = preg_replace($pattern, $replacement, $strkey2);

  $pattern = '/[^ ]*/';
  $replacement = '';
  $spaces1 = strlen(preg_replace($pattern, $replacement, $strkey1));
  $spaces2 = strlen(preg_replace($pattern, $replacement, $strkey2));

  if ($spaces1 == 0 || $spaces2 == 0 || $numkey1 % $spaces1 != 0 || $numkey2 % $spaces2 != 0) {
    socket_close($user->socket);
    console('failed');
    return false;
  }

  $ctx = hash_init('md5');
  hash_update($ctx, pack("N", $numkey1/$spaces1));
  hash_update($ctx, pack("N", $numkey2/$spaces2));
  hash_update($ctx, $data);
  $hash_data = hash_final($ctx,true);

  $upgrade  = "HTTP/1.1 101 WebSocket Protocol Handshake\r\n" .
              "Upgrade: WebSocket\r\n" .
              "Connection: Upgrade\r\n" .
              "Sec-WebSocket-Origin: " . $origin . "\r\n" .
              "Sec-WebSocket-Location: ws://" . $host . $resource . "\r\n" .
              "\r\n" .
              $hash_data;

  socket_write($user->socket,$upgrade.chr(0),strlen($upgrade.chr(0)));
  $user->handshake=true;
  console($upgrade);
  console("Done handshaking...");
  return true;
}

function getheaders($req){
  $r=$h=$o=null;
  if(preg_match("/GET (.*) HTTP/"   ,$req,$match)){ $r=$match[1]; }
  if(preg_match("/Host: (.*)\r\n/"  ,$req,$match)){ $h=$match[1]; }
  if(preg_match("/Origin: (.*)\r\n/",$req,$match)){ $o=$match[1]; }
  if(preg_match("/Sec-WebSocket-Key2: (.*)\r\n/",$req,$match)){ $key2=$match[1]; }
  if(preg_match("/Sec-WebSocket-Key1: (.*)\r\n/",$req,$match)){ $key1=$match[1]; }
  if(preg_match("/\r\n(.*?)\$/",$req,$match)){ $data=$match[1]; }
  return array($r,$h,$o,$key1,$key2,$data);
}

function getuserbysocket($socket){
  global $users;
  $found=null;
  foreach($users as $user){
    if($user->socket==$socket){ $found=$user; break; }
  }
  return $found;
}

function     say($msg=""){ echo $msg."\n"; }
function    wrap($msg=""){ return chr(0).$msg.chr(255); }
function  unwrap($msg=""){ return substr($msg,1,strlen($msg)-2); }
function console($msg=""){ global $debug; if($debug){ echo $msg."\n"; } }

class User{
  var $id;
  var $socket;
  var $handshake;
}

?>

我想使用 Socket.io 从我的 Swift 客户端连接到这个套接字:

let io:SocketIOClient = SocketIOClient(socketURL: URL(string: "example.com:8080/server.php")!, config: [.log(true), .compress])

override func viewDidLoad() {
    super.viewDidLoad()

    self.io.on(clientEvent: .connect) { (data:[Any], ack:SocketAckEmitter) in
        NSLog("Socket connected!")
    }
    self.io.on(clientEvent: .disconnect) { (data:[Any], ack:SocketAckEmitter) in
        NSLog("Socket disconnected!")
    }
    self.io.connect()
}

我在我的 Mac 终端上使用 SSH 运行服务器。 PHP 网络套接字表示它正在监听连接，但它不响应 socket.io 连接。服务器和客户端都没有给我任何错误，所以我假设我错过了连接过程中的关键步骤。我想知道当您尝试连接到 PHP 网络套接字时是否可以使用 Socket.IO 快速客户端执行握手。这是兼容性问题还是我只是忘记了什么？顺便说一句，到目前为止，您可能已经注意到我对网络套接字编程还很陌生(不到一周前我发现了网络套接字)，所以如果这是一个真正的菜鸟问题，请原谅。我感谢我能得到的任何帮助。谢谢!

Answer 1

socket.io != webSocket。您不能将 socket.io 客户端连接到 webSocket 服务器。 Socket.io 在 webSocket 之上添加了自己的协议(protocol)。虽然 socket.io 在幕后使用 webSocket 传输，但如果您只有 webSocket 服务器，客户端将无法连接。

您必须将 webSocket 客户端连接到 webSocket 服务器。或者，将 socket.io 客户端连接到 socket.io 服务器。

因此，在您的情况下，如果您有一个 socket.io 客户端，那么您需要为您的服务器环境获取一个 socket.io 服务器并改用它。