> On Oct 5, 2016, at 9:43 AM, Jakub Hrozek <jhro...@redhat.com> wrote: > > On Wed, Oct 05, 2016 at 07:42:23AM -0600, Philip Prindeville wrote: >> On Oct 5, 2016, at 5:45 AM, Michal Židek <mzi...@redhat.com> wrote: >>> >>> ACK to the code from Philip. I amended the commit >>> message to meet our style. >>> >>> I would like to push this together with at least some >>> sanity tests. See the second patch. I am looking for >>> someone from SSSD developers to review the tests. >>> >>> Michal >>> >>> PS: Btw. Philip, I am interested for what project are you >>> using ding-libs. >>> >> >> >> The project was an SSSD provider (proxy) for Tacacs+ accounting, >> authentication, and authorization. > > Wow, I'm intrigued and I think all of us want to help! > > Is that an in-house project or do you plan on open sourcing it? If the > latter, I wonder if we could help with review, writing more docs or just > about anything?
Sure, we were planning on upstreaming it. For the Tacacs+ part, I had used an event-driven dispatcher (libevent), but the DBus listener ran in a separate thread… I had wanted to make everything be event-driven, including servicing the arrival of DBus requests from SSSD, because then you could handle request/reply pairs asynchronously for Tacacs, which then enables you to let Tacacs+ reuse connections to servers if they’re already up, or do multiplexing (i.e. having multiple requests on the fly, and having responses come back out of order, etc). That part I haven’t figured out yet… how to integrate DBus with libevent. There are a couple of posting online about how to do this, but nothing that looks very elegant. See: https://lists.freedesktop.org/archives/dbus/2016-August/017005.html <https://lists.freedesktop.org/archives/dbus/2016-August/017005.html> The one example I saw (http://stackoverflow.com/questions/9378593/dbuswatch-and-dbustimeout-examples) struck me as having an unfortunate race condition. I looked at that and thought, “there must be a better way”. So once I clear that hurdle, and the changes I had to make to pam_tacplus’s libtac library get accepted upstream (I’m about a third of the way done) then I can finish the rewrite (sans the ugly libevent/pthread mix that it currently has) and upstream the entire thing. I’ve not looking into the GDBus interface, just the old glib-dbus. Any advice on how to handle that particular problem would be especially helpful. Thanks, -Philip
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