c++ - 为什么SSL_read读取1400字节后SSL_pending返回0？

Question

while(1)
{
    read_blocked_on_write=0;

    const int buff_len = 1024;
    char buff[buff_len];

    iResult = SSL_read(ssl, buff, buff_len);

    int ssl_err = SSL_get_error(ssl, iResult);
    if(ssl_err == SSL_ERROR_NONE)
    {
        if(offset + iResult > recvbuflen - 1)
        {
            FD_ZERO(&fdread);
            FD_ZERO(&fdwrite);
            MessageBox(hwnd, TEXT("ERROR"), TEXT("Not enough memory!"), MB_OK | MB_ICONERROR);
            return 1;
        }
        memcpy(recvbuf + offset, buff, iResult);
        offset += iResult;
        if(SSL_pending(ssl))
        {
            continue;
        }
        else
        {
            bFinish = true;
            break;
        }
    }
    else if(ssl_err == SSL_ERROR_ZERO_RETURN)
    {
        bFinish = true;
        break;
    }
    else if(ssl_err == SSL_ERROR_WANT_READ)
    {
        break;
    }
    else if(ssl_err == SSL_ERROR_WANT_WRITE)
    {
        /* We get a WANT_WRITE if we're
        trying to rehandshake and we block on
        a write during that rehandshake.

        We need to wait on the socket to be 
        writeable but reinitiate the read
        when it is */
        read_blocked_on_write=1;
        break;
    }
    else
    {
        FD_ZERO(&fdread);
        FD_ZERO(&fdwrite);
        MessageBox(hwnd, TEXT("ERROR"), TEXT("SSL problem!"), MB_OK | MB_ICONERROR);
        return 1;
    }
}

Answer 1

我不是 ssl 专家，但这可能是因为没有什么可读的。您正在读取和移动缓冲区(最多需要几毫秒)，然后如果在那一刻没有更多内容可读则终止。同时，您正在处理低得多的网络速度和较低层的解密。在那一刻没有任何东西可以归还并非不可能。

为什么要在那里进行检查？如果您尝试多路复用或其他方式，是否可以选择以非阻塞方式打开套接字？