在 php 中使用 ssh2 函数连接服务器并执行命令

代码

来自

php.net http://php.net/manual/zh/function.ssh2-connect.php#104758

class NiceSSH
{
    // SSH Host 
    private $ssh_host = 'myserver.example.com';
    // SSH Port 
    private $ssh_port = 22;
    // SSH Server Fingerprint 
    private $ssh_server_fp = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';
    // SSH Username 
    private $ssh_auth_user = 'username';
    // SSH Public Key File 
    private $ssh_auth_pub = '/home/username/.ssh/id_rsa.pub';
    // SSH Private Key File 
    private $ssh_auth_priv = '/home/username/.ssh/id_rsa';
    // SSH Private Key Passphrase (null == no passphrase) 
    private $ssh_auth_pass;
    // SSH Connection 
    private $connection;

    public function connect()
    {
        if (! ($this->connection = ssh2_connect($this->ssh_host , $this->ssh_port))) {
            throw new Exception('Cannot connect to server');
        }
        $fingerprint = ssh2_fingerprint($this->connection , SSH2_FINGERPRINT_MD5 | SSH2_FINGERPRINT_HEX);
        if (strcmp($this->ssh_server_fp , $fingerprint) !== 0) {
            throw new Exception('Unable to verify server identity!');
        }
        if (! ssh2_auth_pubkey_file($this->connection , $this->ssh_auth_user , $this->ssh_auth_pub , $this->ssh_auth_priv , $this->ssh_auth_pass)) {
            throw new Exception('Autentication rejected by server');
        }
    }

    public function exec($cmd)
    {
        if (! ($stream = ssh2_exec($this->connection , $cmd))) {
            throw new Exception('SSH command failed');
        }
        stream_set_blocking($stream , true);
        $data = "";
        while ($buf = fread($stream , 4096)) {
            $data .= $buf;
        }
        fclose($stream);
        return $data;
    }

    public function disconnect()
    {
        $this->exec('echo "EXITING" && exit;');
        $this->connection = null;
    }

    public function __destruct()
    {
        $this->disconnect();
    }
}