[libnice] libnice and Google chrome
Patrick Regnouf
patrick at patricknet.net
Wed Nov 7 16:21:53 UTC 2018
Dear mailing list
Moving on from previous problem (STUN connection not completing in
Chrome) which I believe was created by the fact that I did not DTLS
handshake the browser, I have now created a thread, based on openssl
which is responsible for completing the TLS handshake.
This thread has its own socket and when I receive the Client Hello in
cb_nice_recv() callback, I forward that packet to the TLS thread which
responds with a Server Hello.
When I attempt to forward that packet to the browser through
nice_agent_send() it always return an error (Resource temporarily
unavailable - EAGAIN) and does not transmit the packet.
What would cause nice_agent_send() to fail like that?
Should I use another API to send that DTLS Server Hello to the browser?
Thanks
/Patrick
On Wed, 2018-10-31 at 13:38 +0000, Olivier Crête wrote:
> Hi,
>
> The real question is why Chrome doesn't go from checking to connected.
> This should happen as soon as it receives the first conncheck that
> succeeds if it is the controlling agent.
>
> Olivier
>
> On Wed, 2018-10-31 at 13:29 +0000, Patrick Regnouf wrote:
> > My own investigations led to the same piece of code. Unfortunately
> > still haven’t got a clue why am not completing. I have been waiting
> > even introduced a sleep in the code to give it time to complete. All
> > to no avail. However when I close my relay, chrome fires a failure
> > event which is normal behaviour. Any more idea where to look?
> >
> > /Patrick
> >
> > /Patrick
> >
> > > On 31 Oct 2018, at 11:40, Olivier Crête <
> > > olivier.crete at collabora.com> wrote:
> > >
> > > Hi,
> > >
> > > I think I was on the wrong path in any case.
> > >
> > > The code that produces this is here in Chrome:
> > >
> > >
> https://webrtc.googlesource.com/src/+/master/p2p/base/p2ptransportchannel.cc#376
> > >
> > > And I wonder if this is jus tnormal, you just need to wait a little
> > > longer to get completed. But you should be getting "connected" at
> > > least, which is enbough to start exchanging data.
> > >
> > > Olivier
> > >
> > >
> > >
> > >
> > > > On Tue, 2018-10-30 at 17:08 +0000, Patrick Regnouf wrote:
> > > > As I said I cannot change a single character in the javascript
> > > > (it's
> > > > a
> > > > janus client script)
> > > >
> > > > when I tried to change the role of my software I got a role
> > > > conflict
> > > > ;-)
> > > >
> > > > /Patrick
> > > >
> > > >
> > > > > On Tue, 2018-10-30 at 16:54 +0000, Olivier Crête wrote:
> > > > > Or trying to see if it works if the Chrome side is the
> > > > > controller
> > > > > and
> > > > > libnice is controlled.
> > > > >
> > > > > > On Tue, 2018-10-30 at 16:53 +0000, Olivier Crête wrote:
> > > > > > Hi,
> > > > > >
> > > > > > I wonder if it doesn't like aggressive nomination.. It's been
> > > > > > removed
> > > > > > from the latest RFC. Maybe you can try disabling that in
> > > > > > libnice.
> > > > > >
> > > > > > Olivier
> > > > > >
> > > > > > > On Tue, 2018-10-30 at 16:37 +0000, Patrick Regnouf wrote:
> > > > > > > a significant error message in the chrome debug:
> > > > > > >
> > > > > > > Ice not completed yet for this channel as
> > > > > > > Net[any:0.0.0.x/0:Wildcard:id=0] has more than 1
> > > > > > > connection.
> > > > > > >
> > > > > > > ...
> > > > > > >
> > > > > > > Does that mean something to you?
> > > > > > >
> > > > > > > /Patrick
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > On Tue, 2018-10-30 at 16:06 +0000, Olivier Crête wrote:
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > In wireshark, you can save a pcap file containing only
> > > > > > > > the
> > > > > > > > selected
> > > > > > > > packets. For example, you can keep onlyt he packets with
> > > > > > > > have
> > > > > > > > a
> > > > > > > > src&dest on your local machine.
> > > > > > > >
> > > > > > > > I took those commands from the internets, I actually
> > > > > > > > don't
> > > > > > > > have
> > > > > > > > Chrome
> > > > > > > > either.
> > > > > > > >
> > > > > > > > Olivier
> > > > > > > >
> > > > > > > > > On Tue, 2018-10-30 at 15:52 +0000, Patrick Regnouf
> > > > > > > > > wrote:
> > > > > > > > > I will open an issue shortly, in the meantime I should
> > > > > > > > > have said
> > > > > > > > > it’s all happening in Linux (Debian Jessie derived)
> > > > > > > > > with
> > > > > > > > > chrome
> > > > > > > > > 70
> > > > > > > > > (latest build)
> > > > > > > > >
> > > > > > > > > So not sure about that command line also the logs will
> > > > > > > > > be
> > > > > > > > > somewhere
> > > > > > > > > in the user directory.
> > > > > > > > >
> > > > > > > > > I will let you know more as soon as I get chrome to
> > > > > > > > > give
> > > > > > > > > me
> > > > > > > > > something
> > > > > > > > >
> > > > > > > > > Thanks again for your ongoing help
> > > > > > > > >
> > > > > > > > > At the moment I can only give you screenshots of
> > > > > > > > > wireshark
> > > > > > > > > as
> > > > > > > > > the
> > > > > > > > > captures contain data from all over the network and I
> > > > > > > > > can
> > > > > > > > > not
> > > > > > > > > guarantee that they do not contain confidential info
> > > > > > > > >
> > > > > > > > > Also the stream am trying to relay is video only, no
> > > > > > > > > audio...
> > > > > > > > >
> > > > > > > > > As I said chrome and my relay software are meant to
> > > > > > > > > work on
> > > > > > > > > the
> > > > > > > > > same
> > > > > > > > > machine so the stream and the stun will all happen
> > > > > > > > > between
> > > > > > > > > localhost
> > > > > > > > > and the stun server ) I have tried several of those
> > > > > > > > > with
> > > > > > > > > thee
> > > > > > > > > same
> > > > > > > > > result btw)
> > > > > > > > >
> > > > > > > > > We really need to get to the bottom of this
> > > > > > > > >
> > > > > > > > > Thanks again
> > > > > > > > >
> > > > > > > > > /Patrick
> > > > > > > > >
> > > > > > > > > > On 30 Oct 2018, at 14:31, Olivier Crête <
> > > > > > > > > > olivier.crete at collabora.com> wrote:
> > > > > > > > > >
> > > > > > > > > > Hi,
> > > > > > > > > >
> > > > > > > > > > I saw, can you just send the message without the
> > > > > > > > > > attachments.
> > > > > > > > > > Can
> > > > > > > > > > you
> > > > > > > > > > save the pcap and the log on both sides and create an
> > > > > > > > > > issue
> > > > > > > > > > on
> > > > > > > > > > gitlab.freedesktop.org/libnice/libnice and attach
> > > > > > > > > > everything
> > > > > > > > > > there.
> > > > > > > > > >
> > > > > > > > > > There must be a way to get more debug from Chrome.
> > > > > > > > > >
> > > > > > > > > > You can do something like:
> > > > > > > > > > - chrome://webrtc-internals
> > > > > > > > > > - chrome.exe --enable-logging --v=4 --
> > > > > > > > > > vmodule=*libjingle/source/talk/*=4 --
> > > > > > > > > > vmodule=*media/audio/*=4
> > > > > > > > > > - chrome_debug.log is here:
> > > > > > > > > >
> > > > > > > > > > C:\$USERDATA\AppData\Local\Google\Chrome\User Data
> > > > > > > > > >
> > > > > > > > > > Olivier
> > > > > > > > > >
> > > > > > > > > > > On Tue, 2018-10-30 at 12:20 +0000, Patrick Regnouf
> > > > > > > > > > > wrote:
> > > > > > > > > > > I have sent a mail with a couple of screenshots and
> > > > > > > > > > > it
> > > > > > > > > > > got
> > > > > > > > > > > blocked as
> > > > > > > > > > > too big for the list.
> > > > > > > > > > >
> > > > > > > > > > > I think it might be waiting for your approval
> > > > > > > > > > >
> > > > > > > > > > > Thanks
> > > > > > > > > > >
> > > > > > > > > > > /Patrick
> > > > > > > > > > >
> > > > > > > > > > > PS: Are you french?
> > > > > > > > > > >
> > > > > > > > > > > > On Tue, 2018-10-30 at 10:17 +0000, Olivier Crête
> > > > > > > > > > > > wrote:
> > > > > > > > > > > > Hi,
> > > > > > > > > > > >
> > > > > > > > > > > > In your Wireshark logs, do you see Chrome getting
> > > > > > > > > > > > binding
> > > > > > > > > > > > responses
> > > > > > > > > > > > back from the libnice side?
> > > > > > > > > > > >
> > > > > > > > > > > > Olivier
> > > > > > > > > > > >
> > > > > > > > > > > > > On Mon, 2018-10-29 at 20:19 +0000, Patrick
> > > > > > > > > > > > > Regnouf
> > > > > > > > > > > > > wrote:
> > > > > > > > > > > > > Hi, New to the mailing list so pologies iof
> > > > > > > > > > > > > the
> > > > > > > > > > > > > question
> > > > > > > > > > > > > has
> > > > > > > > > > > > > been
> > > > > > > > > > > > > answered before.
> > > > > > > > > > > > >
> > > > > > > > > > > > > I am writing an RTP relay and am stumbling upon
> > > > > > > > > > > > > a
> > > > > > > > > > > > > problem.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Based on the threaded example I have written
> > > > > > > > > > > > > the
> > > > > > > > > > > > > part
> > > > > > > > > > > > > of
> > > > > > > > > > > > > the
> > > > > > > > > > > > > software
> > > > > > > > > > > > > that uses a STUN server to connect to a
> > > > > > > > > > > > > javascript
> > > > > > > > > > > > > running in
> > > > > > > > > > > > > chrome.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Basically this is what happens on my software
> > > > > > > > > > > > > side:
> > > > > > > > > > > > >
> > > > > > > > > > > > > waiting for state READY or FAILED
> > > > > > > > > > > > > signal...SIGNAL:
> > > > > > > > > > > > > state
> > > > > > > > > > > > > changed
> > > > > > > > > > > > > 1 1
> > > > > > > > > > > > > connected[3]
> > > > > > > > > > > > > State is now connected
> > > > > > > > > > > > > SIGNAL: state changed 1 1 ready[4]
> > > > > > > > > > > > > State is now ready
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > so cleary libnice is firing my callback stating
> > > > > > > > > > > > > that
> > > > > > > > > > > > > the
> > > > > > > > > > > > > connection
> > > > > > > > > > > > > is
> > > > > > > > > > > > > firmly established
> > > > > > > > > > > > >
> > > > > > > > > > > > > wireshark is showing binding indication packet
> > > > > > > > > > > > >
> > > > > > > > > > > > > but and that is the stumper
> > > > > > > > > > > > >
> > > > > > > > > > > > > Here is the log from chrome in webrtc
> > > > > > > > > > > > > internals:
> > > > > > > > > > > > >
> > > > > > > > > > > > > Time Event
> > > > > > > > > > > > > 29/10/2018, 19:59:11 setRemoteDescription
> > > > > > > > > > > > > 29/10/2018, 19:59:11 signalingstatechange
> > > > > > > > > > > > > 29/10/2018, 19:59:11 receiverAdded
> > > > > > > > > > > > > 29/10/2018,
> > > > > > > > > > > > > 19:59:11 setRemoteDescriptionOnSuccess
> > > > > > > > > > > > > 29/10/2018, 19:59:11 createAnswer
> > > > > > > > > > > > > 29/10/2018, 19:59:11 createAnswerOnSuccess
> > > > > > > > > > > > > 29/10/2018, 19:59:11 setLocalDescription
> > > > > > > > > > > > > 29/10/2018,
> > > > > > > > > > > > > 19:59:11 iceconnectionstatechange
> > > > > > > > > > > > > 29/10/2018, 19:59:11 signalingstatechange
> > > > > > > > > > > > > 29/10/2018,
> > > > > > > > > > > > > 19:59:11 setLocalDescriptionOnSuccess
> > > > > > > > > > > > > 29/10/2018, 19:59:11 icegatheringstatechange
> > > > > > > > > > > > > 29/10/2018, 19:59:11 icecandidate (host)
> > > > > > > > > > > > > 29/10/2018, 19:59:11 icegatheringstatechange
> > > > > > > > > > > > >
> > > > > > > > > > > > > the iceconnectionstatechange with the firm
> > > > > > > > > > > > > connection
> > > > > > > > > > > > > is
> > > > > > > > > > > > > never
> > > > > > > > > > > > > fired.
> > > > > > > > > > > > > which means that chrome never detected the
> > > > > > > > > > > > > estblished
> > > > > > > > > > > > > connection
> > > > > > > > > > > > > after
> > > > > > > > > > > > > the last trickle whereas my program does.
> > > > > > > > > > > > >
> > > > > > > > > > > > > The last iceconnectionstatechange fired in
> > > > > > > > > > > > > chrome
> > > > > > > > > > > > > is
> > > > > > > > > > > > > "checking"
> > > > > > > > > > > > >
> > > > > > > > > > > > > how do i go about debugging that ???
> > > > > > > > > > > > >
> > > > > > > > > > > > > Any help truly appreciated
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thanks
> > > > > > > > > > > > >
> > > > > > > > > > > > > /Patrick
> > > > > > > > > > > > > patrick at patricknet.net
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > _______________________________________________
> > > > > > > > > > > > > nice mailing list
> > > > > > > > > > > > > nice at lists.freedesktop.org
> > > > > > > > > > > > >
> https://lists.freedesktop.org/mailman/listinfo/nice
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > Olivier Crête
> > > > > > > > > > olivier.crete at collabora.com
> > > > > > > > >
> > > > > > > > >
> > > > > > >
> > > > > > >
> > > >
> > > >
> > >
> > > --
> > > Olivier Crête
> > > olivier.crete at collabora.com
> >
> >
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