[Nice] Starting with libnice
Tiago Sá
tiagosa at di.uminho.pt
Wed Nov 16 17:30:56 PST 2011
Hi again Youness,
thanks a lot for your help.
I believe I solved the problems you pointed before.
I am using a dumb method to exchange candidates. I write them to file and
exchange them using a ftp server (I will improve it later).
So, the way I run it is:
(HostA) ./client l
(HostB) ./client r
//local candidates are gathered and written to file
(HostA) put leftCands.bin on FTP and get rightCands.bin
(HostB) put rightCands.bin on FTP and get leftCands.bin
//read local credentials and write them on the remote host
I am using a relay server, that should work as a last resort. But during
the local candidate gathering, sometimes it gets a relayed candidate, but
most of the times it doesn't. Can it be related with timeouts?
Either way, it can never get a pair a establish a connection. :(
I don't have a clue why this happens..
Can you please have a look?
Cheers,
Tiago
On Fri, Nov 4, 2011 at 2:03 PM, Youness Alaoui <
youness.alaoui at collabora.co.uk> wrote:
> Hi again Tiago,
>
> For the remote candidates, you will need a third party server to exchange
> that
> information, usually the candidates would be sent over SIP or XMPP for
> example.
> ICE cannot work if you don't have a third party server with which you can
> reliably exchange candidates. For testing purposes you could have it print
> the
> candidates to stdout, and you could copy/paste that into stdin of the other
> instance and have it parse the input.. or you could hardcode a port to
> connect
> to and do the candidate exchange.. there's no easy way of doing that
> though.
> You cannot hardcode the candidates because the port used will be random
> everytime, also, you will need to exchange the randomly generated
> username/password (nice_agent_get_local_credentials +
> nice_agent_set_remote_credentials) to make the connectivity checks work.
>
> As for your example, here are a few comments :
> 1 - you call the nice_agent_set_relay_info with stream_id being
> uninitialized,
> you must call it *after* you do the nice_agent_add_stream...
> 2 - you don't need those GValues, you can just do
> g_object_set (G_OBJECT(agent),
> "stun-server", "66.228.45.110",
> "stun-server-port", 3478,
> NULL);
> 3 - You shouldn't set the remote credentials as the same as the local ones
> 4 - In your print_candidate_info, you may also want to print the port used.
>
> I hope this helps, let me know if you have further questions.
>
> Youness.
>
>
> On 11/03/2011 12:57 PM, Tiago Sá wrote:
> > Hi Youness,
> >
> > I have been trying to create a simple application based on the first
> link you
> > pointed before.
> > Thanks for the tips you gave me. I have a couple of questions though, if
> you can
> > help me.
> >
> > I need to find a way to get the remote candidates passed from a peer to
> another.
> > Can you point an easy way to do that?
> > Could I hardcode the remote candidates list, for testing purposes?
> >
> > Right now, I only get two local candidates (HOST and SERVER_REFLEXIVE).
> > I am trying to use the numb TURN server, shouldn't I get a RELAYED
> candidate too?
> >
> > I am attaching the code. Can you please have a look at the code and
> check where
> > the error could be?
> >
> > Thanks for helping!
> >
> > Regards,
> > Tiago Sá
> >
> >
> > On Wed, Oct 19, 2011 at 10:53 PM, Youness Alaoui <
> youness.alaoui at collabora.co.uk
> > <mailto:youness.alaoui at collabora.co.uk>> wrote:
> >
> > Hi,
> >
> > Welcome to the world of libnice :)
> > Yes, doing NAT traversal is far from being easy, the only solution
> is pretty
> > much to use the ICE specification and that's not easy to implement,
> so that's
> > why you'd need to use libnice.
> >
> > For an example, you can have a look at the unit tests, like
> > tests/test-fullmode.c for example, although that does a lot of
> stuff. You can
> > see a quick example in the documentation for NiceAgent :
> > http://nice.freedesktop.org/libnice/NiceAgent.html
> >
> > For smaller examples, you can look at the libnice mailing list
> archives, some
> > people posted their example code where they were having problems.
> For example, a
> > very simple example can be seen here :
> > http://lists.freedesktop.org/archives/nice/2011-January/000404.html
> > But make sure to click on the "Next message" to read the whole
> thread because
> > that example had a bug that I explained how to fix in the following
> emails.
> > Same for this thread :
> > http://lists.freedesktop.org/archives/nice/2011-October/000434.html
> >
> > I hope that helps,
> > Youness.
> >
> > On 10/19/2011 09:58 AM, Tiago Sá wrote:
> > > Hi all,
> > >
> > > my name is Tiago Sá, I am a junior researcher from Portugal and
> this is my
> > first
> > > mail to this list.
> > > I have a NAT traversal problem to solve and I have been looking
> for a solution
> > > during the last weeks, which, as I found out, is not so trivial as
> I
> > thought before.
> > > As stated on the libnice homepage, libnice seems to be what I am
> looking for:
> > >
> > > "ICE is useful for applications that want to establish
> peer-to-peer
> > UDP data
> > > streams. It automates the process of traversing NATs and
> provides security
> > > against some attacks. It also allows applications to create
> reliable
> > streams
> > > using a TCP over UDP layer."
> > >
> > >
> > > I have been looking for the provided documentation and I am
> feeling kind
> > of lost.
> > > Is there any example application or tutorial to get started?
> > > Could you please share a basic application of this kind or point
> me a
> > direction?
> > >
> > >
> > > Thanks in advance for your help.
> > >
> > > Regards,
> > > Tiago Sá
> > >
> > > --
> > > Tiago Sá
> > > Universidade do Minho, Braga - Portugal
> > >
> > > http://about.me/tiagosa/
> > >
> > >
> > >
> > > _______________________________________________
> > > Nice mailing list
> > > Nice at lists.freedesktop.org <mailto:Nice at lists.freedesktop.org>
> > > http://lists.freedesktop.org/mailman/listinfo/nice
> >
> >
> >
> > _______________________________________________
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> > http://lists.freedesktop.org/mailman/listinfo/nice
> >
> >
> >
> >
> > --
> > Tiago Sá
> > Universidade do Minho, Braga - Portugal
> > www.tiagosa.com <http://www.tiagosa.com>
> >
>
>
>
--
Tiago Sá
Universidade do Minho, Braga - Portugal
www.tiagosa.com
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