如何检查 SSL 套接字是否关闭（异步）

发布于 2024-11-09 04:24:48 字数 766 浏览 0 评论 0原文

我使用 boost asio 进行网络有一段时间了，但从未用于 SSL 套接字。现在我需要使用 SSL 套接字，它们工作得很好。但我无法找出套接字何时关闭（我通常这样做，就像处理常规套接字一样 - 在回调中使用 boost::asio::async_read_until() 时检查错误值即使

这是一些相关的代码片段：

boost::asio::streambuf streambuf;
boost::asio::ssl::context sslctx(io_service, boost::asio::ssl::context::tlsv1);
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> sock(io_service, sslctx);

void DoAsyncRead()
{
    boost::asio::async_read_until(sock, streambuf, "\n", MyReadHandler);
}

void MyReadHandler(const boost::system::error_code& error, size_t bytes_transferred)
{
  if (error) {
    std::cout << "Read error: " << error.message() << std::endl;
  } else {
    // ...
  }
}

我终止服务器或断开客户端连接，错误条件也永远不会成立。

原文

I've been using boost asio for networking for some time, but never for SSL sockets. Now i'm required to use SSL sockets and they work pretty fine. But i am not able to find out when a sockets get closed (I usually did this as I did with regular sockets - checking the error value when using boost::asio::async_read_until() in the callback function.

Here's some relevant code snippets:

boost::asio::streambuf streambuf;
boost::asio::ssl::context sslctx(io_service, boost::asio::ssl::context::tlsv1);
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> sock(io_service, sslctx);

void DoAsyncRead()
{
    boost::asio::async_read_until(sock, streambuf, "\n", MyReadHandler);
}

void MyReadHandler(const boost::system::error_code& error, size_t bytes_transferred)
{
  if (error) {
    std::cout << "Read error: " << error.message() << std::endl;
  } else {
    // ...
  }
}

The error condition is never true, even if I kill the server, or drop the client connection. How can I track if the connection is closed?

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