[Nice] minimal example
Tiago Sá
tiagosa at di.uminho.pt
Fri Jan 13 07:44:06 PST 2012
I am using XMPP (libstrophe) to exchange the credentials and candidates
using simple messages.
I am writing about it right now on my Master thesis, maybe I can share it
later.
Good luck for you :)
On Fri, Jan 13, 2012 at 3:30 PM, Eduardo Bezerra <kdubezerra at gmail.com>wrote:
> Haha! That solved it! :)
>
> Now I just need a proper way of sending the candidates to the other peer.
> How do you do that? Does libnice somehow provide serialization for the
> candidates and credentials?
>
> By the way, libnice managed to traverse my university's network, where
> utorrent often fails to do it :) But the other end is at my place, where
> there is an upnp-enabled router, so having one of the sides behind a
> "friendly" nat probably made this task quite easy for the library. Now I
> have to get a machine in another paranoid network make it talk to my lab
> computer. This should be a nice demonstration of the power of libnice :)
>
>
> On Fri, Jan 13, 2012 at 4:02 PM, Eduardo Bezerra <kdubezerra at gmail.com>wrote:
>
>> I was using stunserver.org:3478 and I'm not setting a relay (turn)
>> server, since I don't really want my application to support that, at least
>> for now...
>>
>> So, I think I kinda figured it out, just don't know how to solve it yet :)
>>
>> the lab peer is running on a mac os x (10.6.8) and the right one is on
>> ubuntu (10.10 x86_64), so I guess writing the candidates structs to a
>> binary file and reading in a different os is causing this bug. I will run
>> now the left peer on a virtual machine with exactly the same os and post
>> the results to you guys to keep you updated...
>>
>> (by the way, should I clean up the previous e-mails from my reply?)
>>
>>
>> On Fri, Jan 13, 2012 at 3:49 PM, Tiago Sá <tiagosa at di.uminho.pt> wrote:
>>
>>> Hi Eduardo,
>>>
>>> let's stick to English then :)
>>> I believe the first problem is that you should change the STUN/TURN info
>>> on the code.
>>> Try registering on http://numb.viagenie.ca/ and changing these two
>>> lines according to that:
>>> //NUMB server
>>> // g_object_set (G_OBJECT (agent), "stun-server", "66.228.45.110",
>>> "stun-server-port", 3478, NULL);
>>>
>>> //set relay info
>>> nice_agent_set_relay_info (agent, stream_id, 1, "66.228.45.110", 3478,
>>> <yourusername>,<yourpassword>, NICE_RELAY_TYPE_TURN_UDP))
>>>
>>> You should be getting three candidates on each agent.
>>>
>>> I had some problems with that service too, so I installed a STUN/TURN
>>> server on a publicly addressed machine.
>>>
>>> PS: I'm sure that is not the cleanest code you have ever read :)
>>>
>>> Cheers,
>>> Tiago
>>>
>>> On Fri, Jan 13, 2012 at 2:22 PM, Eduardo Bezerra <kdubezerra at gmail.com>wrote:
>>>
>>>> hehe I think I can ask in Portuguese now, but then the discussion
>>>> wouldn't be useful for many people
>>>>
>>>> so, I tested Tiago's code, which ran fine if both peers are on the same
>>>> machine. However, I started two peers, each under a different NAT (one at
>>>> home and one at the lab) and exchanged the candidates and credentials files
>>>> through scp in the middle of the execution (thanks to the getchar() call).
>>>> However, I got the following output then:
>>>>
>>>> "left" peer (lab):
>>>> ==============================================
>>>> WAIT UNTIL YOU CHANGE FILES (when I did the scp exchange of cands and
>>>> creds files)
>>>>
>>>>
>>>> READING CANDIDATES FROM FILE
>>>> READ 2 CANDIDATES FROM rightCands.bin.
>>>> PRINTING REMOTE CANDIDATES
>>>>
>>>> CANDIDADE NUMBER 0:
>>>> NICE_CANDIDATE_TYPE_HOST
>>>> NICE_CANDIDATE_TRANSPORT_UDP
>>>>
>>>> (process:62780): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> ADDRESS: ?_?
>>>>
>>>> (process:62780): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> BASE ADDRESS: ?_?
>>>> PRIORITY: 2013266431
>>>> STREAM_ID: 1
>>>> COMPONENT_ID: 1
>>>> FOUNDATION: 1
>>>> USERNAME: (null)
>>>> PASSWORD: (null)
>>>> CANDIDADE NUMBER 1:
>>>> NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE
>>>> NICE_CANDIDATE_TRANSPORT_UDP
>>>>
>>>> (process:62780): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> ADDRESS: ?_?
>>>>
>>>> (process:62780): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> BASE ADDRESS: ?_?
>>>> PRIORITY: 1677721855
>>>> STREAM_ID: 1
>>>> COMPONENT_ID: 1
>>>> FOUNDATION: 2
>>>> USERNAME: (null)
>>>> PASSWORD: (null)
>>>> READING REMOTE CREDENTIALS FILE
>>>>
>>>> READING CREDENTIALS FROM FILE rightCreds.bin
>>>> REMOTE USER: ZTS/
>>>> REMOTE PWD: 8j74ohw6S68cwn/B4CnSpw
>>>> (process:62780): libnice-DEBUG: Agent 0x10082e800:
>>>> set_remote_candidates 1 1
>>>> **
>>>> ERROR:../client.c:210:cb_candidate_gathering_done: assertion failed:
>>>> (nice_agent_set_remote_candidates(agent, stream_id, 1, remoteCands))
>>>> Abort trap
>>>> ==============================================
>>>>
>>>>
>>>>
>>>> right peer (home):
>>>> ==============================================
>>>> WRITING LOCAL CREDENTIALS TO FILE rightCreds.bin
>>>> WAIT UNTIL YOU CHANGE FILES
>>>>
>>>>
>>>> READING CANDIDATES FROM FILE
>>>> READ 1 CANDIDATES FROM leftCands.bin.
>>>> PRINTING REMOTE CANDIDATES
>>>>
>>>> CANDIDADE NUMBER 0:
>>>> NICE_CANDIDATE_TYPE_HOST
>>>> NICE_CANDIDATE_TRANSPORT_UDP
>>>>
>>>> (process:25636): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> ADDRESS:
>>>>
>>>> (process:25636): libnice-CRITICAL **: file address.c: line 259
>>>> (nice_address_to_string): should not be reached
>>>> BASE ADDRESS:
>>>> PRIORITY: 2013266431
>>>> STREAM_ID: 1
>>>> COMPONENT_ID: 1
>>>> FOUNDATION: 1
>>>> USERNAME: (null)
>>>> PASSWORD: (null)
>>>> READING REMOTE CREDENTIALS FILE
>>>>
>>>> READING CREDENTIALS FROM FILE leftCreds.bin
>>>> REMOTE USER: wnj6
>>>> REMOTE PWD: c5ufACXFyUowlh98uQoMBs
>>>> (process:25636): libnice-DEBUG: Agent 0x1689eb0: set_remote_candidates
>>>> 1 1
>>>> **
>>>> ERROR:../client.c:210:cb_candidate_gathering_done: assertion failed:
>>>> (nice_agent_set_remote_candidates(agent, stream_id, 1, remoteCands))
>>>> Abortado
>>>> ==============================================
>>>>
>>>>
>>>>
>>>> Any hints?
>>>>
>>>>
>>>> Eduardo
>>>>
>>>>
>>>> On Fri, Jan 13, 2012 at 10:38 AM, Tiago Sá <tiagosa at di.uminho.pt>wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> thanks Youness for sharing. My application has evolved into a more
>>>>> complex one, with some other features.
>>>>> Anyway, if you need any explanation for these examples, I can do my
>>>>> best.
>>>>>
>>>>> Regards,
>>>>> Tiago Sá
>>>>>
>>>>>
>>>>> On Thu, Jan 12, 2012 at 9:24 PM, Youness Alaoui <
>>>>> youness.alaoui at collabora.co.uk> wrote:
>>>>>
>>>>>> It's a question that I get often. I hope to get some time to write a
>>>>>> proper
>>>>>> tutorial with some example code, in the meantime, I suggest reading
>>>>>> old threads
>>>>>> on this mailing list.
>>>>>> Here is one thread specifically about starting with libnice which
>>>>>> explains how
>>>>>> to do, what the usual bugs/misconceptions are and some sample code is
>>>>>> also shared :
>>>>>> http://lists.freedesktop.org/archives/nice/2011-October/000442.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-October/000443.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-November/000449.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-November/000451.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-November/000456.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-November/000458.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-December/000467.html
>>>>>> http://lists.freedesktop.org/archives/nice/2011-December/000469.html
>>>>>>
>>>>>> For some reason, the list archives doesn't save messages sent with
>>>>>> the list as
>>>>>> CC instead of TO.. so I don't have the messages from Tiago, but you
>>>>>> can read
>>>>>> them inlined in my own answers to him.
>>>>>> In one of his mails he sent a sample program which I've attached to
>>>>>> this mail.
>>>>>> It's a bit more complex than a simple "libnice hello world", but it
>>>>>> should give
>>>>>> you an idea on how to use the API in a real life example.
>>>>>>
>>>>>> Let me know if you have any further questions.
>>>>>> Youness.
>>>>>>
>>>>>> On 01/12/2012 11:49 AM, Eduardo Bezerra wrote:
>>>>>> > Oh and by the way, I've seen the NiceAgent api page... Although
>>>>>> that helped a
>>>>>> > lot in understand what idiomatic libnice uses, it doesn't really
>>>>>> establish any
>>>>>> > "connection"...
>>>>>> >
>>>>>> > On Thu, Jan 12, 2012 at 5:47 PM, Eduardo Bezerra <
>>>>>> kdubezerra at gmail.com
>>>>>> > <mailto:kdubezerra at gmail.com>> wrote:
>>>>>> >
>>>>>> > Hi, I've been studying libnice, and now also glib, since it's
>>>>>> build on top
>>>>>> > of it (it definitely feels much better than going with
>>>>>> libevent, imho).
>>>>>> > However, I still couldn't figure out what I have to do to make
>>>>>> two peers
>>>>>> > talk to each other.
>>>>>> >
>>>>>> > Could you guys provide some (link to a) few-lines, minimalistic
>>>>>> example
>>>>>> > application that traverses the nat with ice and then
>>>>>> communicates with some
>>>>>> > other endpoint? Maybe something like
>>>>>> > this?
>>>>>> http://content.gpwiki.org/index.php/SDL:Tutorial:Using_SDL_net
>>>>>> >
>>>>>> > Thanks a lot again!
>>>>>> >
>>>>>> > Eduardo
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > _______________________________________________
>>>>>> > Nice mailing list
>>>>>> > Nice at lists.freedesktop.org
>>>>>> > http://lists.freedesktop.org/mailman/listinfo/nice
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Nice mailing list
>>>>>> Nice at lists.freedesktop.org
>>>>>> http://lists.freedesktop.org/mailman/listinfo/nice
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Tiago Sá
>>>>> Universidade do Minho, Braga - Portugal
>>>>> www.tiagosa.com
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Nice mailing list
>>>>> Nice at lists.freedesktop.org
>>>>> http://lists.freedesktop.org/mailman/listinfo/nice
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> Nice mailing list
>>>> Nice at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/nice
>>>>
>>>>
>>>
>>>
>>> --
>>> Tiago Sá
>>> Universidade do Minho, Braga - Portugal
>>> www.tiagosa.com
>>>
>>>
>>
>
> _______________________________________________
> Nice mailing list
> Nice at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nice
>
>
--
Tiago Sá
Universidade do Minho, Braga - Portugal
www.tiagosa.com
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