On Tue, Aug 22, 2006 at 12:06:29PM -0400, Steven Young wrote:
> On Tue, Aug 22, 2006 at 03:00:46PM +0200, Marek Marcola wrote:
> > You may use select() but with some care.
> > Simplest way is to:
> > 1) wait on select()
> > 2) read hit from SSL descriptor occur
> > 3) read incrementally with SSL_read() from that descriptor until
> > WANT_READ
> > (or in other words - get all data from SSL read buffer)
> > 4) go to select()
>
> So does the following not-really-pseudocode look right (connobjs is
> a linked list of connection objects)?
To answer my own question: No. Here is an amended version.
> for(cp = connobjs; cp; cp = cp->next)
> cp->want_write = false;
>
> while(!quit) {
> for(cp = connobjs; cp; cp = cp->next) {
> if(cp->want_write || cp->output_buffer) {
> /* either openssl wants to say something, or
> * we want to send something */
> FD_SET(cp->fd, &writefds);
> } else {
> FD_SET(cp->fd, &readfds);
> }
> }
>
> select(maxfd + 1, &readfds, &writefds, NULL, &timeout);
>
> for(cp = connobjs; cp; cp = cp->next) {
> if(cp->want_write || cp->output_buffer) {
> if(FD_ISSET(&cp->fd, &writefds) {
> if(cp->output_buffer) {
> byteswr = SSL_write(cp->sslobj,
> cp->output_buffer,
> cp->output_bufsz);
> if(byteswr <= 0) {
> err = ERR_get_error(cp->sslobj);
> if(err == SSL_ERROR_WANT_WRITE)
> cp->want_write = true;
> } else {
>
> remove_bytes_from_beginning_of_buffer(cp->output_buffer,
> cp->output_bufsz);
> }
} else {
bytesrd = SSL_read(cp->sslobj,
cp->input_buffer,
cp->input_bufsz);
if(bytesrd <= 0) {
err = ERR_get_error(cp->sslobj);
if(err == SSL_ERROR_WANT_WRITE)
cp->want_write = true;
} else {
do_something_with_buffer(cp);
}
}
} else if(FD_ISSET(cp->fd, &readfds)) {
bytesrd = SSL_read(cp->sslobj,
cp->input_buffer,
cp->input_bufsz);
if(bytesrd <= 0) {
err = ERR_get_error(cp->sslobj);
if(err == SSL_ERROR_WANT_WRITE)
cp->want_write = true;
} else {
do_something_with_buffer(cp);
}
}
> }
> }
> }
There's plenty of redundant code up there but I thought it would be
more clear than factoring stuff out.
Steve.
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