Net_SSH2::_initShell PHP Method

    function _initShell()
    {
        if ($this->in_request_pty_exec === true) {
            return true;
        }
        $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = $this->window_size;
        $packet_size = 0x4000;
        $packet = pack('CNa*N3', NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_SHELL, $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL], $packet_size);
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }
        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN;
        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
        if ($response === false) {
            return false;
        }
        $terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
        $packet = pack('CNNa*CNa*N5a*', NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_SHELL], strlen('pty-req'), 'pty-req', 1, strlen('vt100'), 'vt100', $this->windowColumns, $this->windowRows, 0, 0, strlen($terminal_modes), $terminal_modes);
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }
        $response = $this->_get_binary_packet();
        if ($response === false) {
            user_error('Connection closed by server');
            return false;
        }
        list(, $type) = unpack('C', $this->_string_shift($response, 1));
        switch ($type) {
            case NET_SSH2_MSG_CHANNEL_SUCCESS:
                // if a pty can't be opened maybe commands can still be executed
            // if a pty can't be opened maybe commands can still be executed
            case NET_SSH2_MSG_CHANNEL_FAILURE:
                break;
            default:
                user_error('Unable to request pseudo-terminal');
                return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
        }
        $packet = pack('CNNa*C', NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_SHELL], strlen('shell'), 'shell', 1);
        if (!$this->_send_binary_packet($packet)) {
            return false;
        }
        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST;
        $response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
        if ($response === false) {
            return false;
        }
        $this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA;
        $this->bitmap |= NET_SSH2_MASK_SHELL;
        return true;
    }