[openssl-users] Means to update read bio only
matt at openssl.org
Fri Feb 6 21:46:32 UTC 2015
On 06/02/15 15:48, Susan Hinrichs wrote:
> In Apache Traffic Server we are primarily using SSL_accept and
> SSL_read/SSL_write with file descriptor bios.
> But during the handshake, we need to feed in our own packets via
> read-only buffers. We use the BIO mem_buf to pass along this data
> without incurring another copy. But on each read during the handshake,
> we need to reset the read bio. We leave the write bio as the file
> descriptor bio the whole time.
> I originally tried to use SSL_set_bio(ssl, new_rbio, SSL_get_wbio(ssl)),
> but that would adjust the output buffering and the handshake would not
> So we created a SSL_set_rbio(ssl, new_rbio), that just frees the old
> rbio and sets the new one. It leaves the wbio and the bbio alone.
> This has worked well for us for a couple releases, but looking forward
> to openssl 1.1, we will no longer be able to use this approach. Can
> someone point me to the preferred way of updating a read bio without
> affecting the write bio processing?
Hmmmm... that's a good question. I don't think you can set just the rbio
I wonder if maybe we extended SSL_set_bio, so that you could do this:
SSL_set_bio(s, rbio, NULL);
I'll look into it.
This would be a good item to add to Rich's wiki page.
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