Re: Re: about stun4j in jain-sip 1.2

Man-Chi Leung wrote:

> hi,
>
> i do have the following doubt, pls help!
>
> 1) when should I start running  stun4j  ?
> it seems that I must start stun4j before [Step 2] :
> Line: udpListeningPoint = sipStack.createListeningPoint(PRIVATE_IP, 
> PRIVATE_PORT,transport);
> bcos, this line will bind the address (e.g. 10.0.0.1:5060). stun4j 
> will not able to bind the same address (10.0.0.1:5060) after this line!!
>
>
> 2) when should I stop running stun4j ?
>
> i must explicitly call addressDiscovery.shutDown();  before [Step 2] , 
> otherwise sipstack will fail to bind address & throw exception at 
> [Step 2]
>
> 3) is my implementation  correct?
> [1st UDP session at NAT]
> -> run stun4j
> -> detect public address
> -> shutdown stun4j


Why shutdown stun4j?

> [2nd UDP session at NAT]
> -> createListeningPoint via sipstack
> -> set Via & contact address
> -> send request
>
> now, i have problem on re-running stun4j multiple times for KeepAlive. 
> how should I do it in jain-sip?

You can periodically send a zero length request (note that facitlity in 
RequestFactory). This will send a zero length SIP message to keep the 
mapping alive. Of course the receiver will just drop the message because 
it is invalid ( and hopefully he will be kind enough to let you keep 
pinging him).

>
> btw, i also checked sip-communicator (in both old and new1.0 version). 
> i could not find any actual integration of stun4j beside using stun4j 
> as a diagnostic tool for debugging.
> did i miss anything? pls advise on any example and tutorial guide on 
> this area. anyone has a good example? can u share with me?
>
> ~manchi
>
> -----------------------------------------------------------
> for stun4j with jain-sip 1.2, I did the following:
> -----------------------------------------------------------
> //
> //  create a method to use stun4j API
> //
> private void setPublicAddress() {
>
>         StunAddress localAddr =  new 
> StunAddress(InetAddress.getLocalHost(),PRIVATE_IP);
>
>         StunAddress serverAddr  serverAddr = new 
> StunAddress(STUN_SERVER_IP, STUN_SERVER_PORT);
>         NetworkConfigurationDiscoveryProcess addressDiscovery = new 
> NetworkConfigurationDiscoveryProcess(
>                 localAddr, serverAddr);
>
>         addressDiscovery.start();
>
>         StunDiscoveryReport stunReport stunReport = 
> addressDiscovery.determineAddress();
>        
>         StunAddress stunAddress = stunReport.getPublicAddress();
>        
>         //
>         // overwrite class field for PUBLIC_IP and PUBLC_PORT with 
> public address detected from stun4j
>         //       
>         this.PUBLIC_IP = stunAddress.getHostAddress();
>         this.PUBLIC_PORT = stunAddress.getPort();
>
>         // need to shutdown stun process, otherwise, stun4j is holding 
> port
>         addressDiscovery.shutDown();
>     }
>
> public void sendRegister() {
>     //
>     // [ Step 1 ]  run setPublicAddress() to set PUBLIC_IP & 
> PUBLIC_PORT with stun4j
>     //
>     this.setPublicAddress();
>     ....
>
>     //
>     // [  Step 2 ] to avoid verfiication check by sip-stack-imp,
>     // create listening point with private address first,
>     // then use setSentBy to replace with public address.
>     //
>     udpListeningPoint = sipStack.createListeningPoint(PRIVATE_IP, 
> PRIVATE_PORT,transport);
>     udpListeningPoint.setSentBy(PUBLIC_IP + ":" + PUBLIC_PORT);
>
>     //
>     // [  Step 3 ] create  ViaHeaders with public address
>     //   
>     ArrayList viaHeaders = new ArrayList();
>     ViaHeader viaHeader = 
> headerFactory.createViaHeader(PUBLIC_IP,PUBLIC_PORT, transport, null);
>     viaHeaders.add(viaHeader);
>
>     //
>     // [ Step 4 ] Create and add the contact name address
>     // with public address       
>     //       
>     SipURI contactURI = 
> addressFactory.createSipURI(fromUserName,PUBLIC_IP);
>     contactURI.setPort(PUBLIC_PORT);
>     Address contactAddress = addressFactory.createAddress(contactURI);
>     contactAddress.setDisplayName(fromUserName);
>     ContactHeader contactHeader = 
> headerFactory.createContactHeader(contactAddress);
>     request.addHeader(contactHeader);
>
>     ...
>     clientTransaction.sendRequest();
>     ....
> }
>
> On 2006-06-13 19:44:11 +0800, "M. Rangnathan" <[email protected]> said:
>
>> Man-Chi Leung wrote:
>>
>>> hi,
>>>
>>> ----------------------------------------------
>>> in jain-sip 1.1 CVS source,
>>> ----------------------------------------------
>>> I found info about stun4j in /docs/faq.html
>>>
>>> How do you enable/use the STUN support?
>>> set the gov.nist.javax.sip.STUN_SERVER to point to 
>>> stun_server_ip_address[:port] where your stun server resides. The 
>>> stack will return mapped address when you getIpAddress() from the 
>>> stack and getPort() from the listening point. With stun, if you have 
>>> a NAT box, these will in general be different from the IP address 
>>> and port used to create the LP. Your application needs to use these 
>>> in setting up the contact address and SDP parameters as appropriate. 
>>> The stack is not responsible for this.
>>>
>>>
>>> ----------------------------------------------
>>> in jain-sip 1.2 CVS source
>>> ----------------------------------------------
>>> i found the following snippet in Class 
>>> "gov.nist.javax.sip.SIPStackImpl.java"
>>>
>>>         String stunAddr = configurationProperties
>>>                 .getProperty("gov.nist.javax.sip.STUN_SERVER");
>>>
>>>         if ( stunAddr != null )
>>>             this.logWriter.logWarning("Ignoring obsolete property "
>>>                 + "gov.nist.javax.sip.STUN_SERVER");
>>>
>>> -----------------------
>>> my Question:
>>> -----------------------
>>> is stun4j totally ignored by jain-sip 1.2 ?
>>
>>
>>
>> Totally and absolutely ignored. :-) Stun was never part of JAIN-SIP. 
>> The previous version had some Stun support in the RI. It was deemed 
>> unecessary and therefore removed.
>>
>>>
>>>
>>> so idea is to just call Stun's API from my jain-sip client, am i 
>>> correct?
>>> - get public address from Stun4j's  
>>> addressDiscovery.determineAddress();
>>> - set public address in Via using API Jain-SIP's  
>>> headerFactory.createViaHeader()
>>
>>
>>
>> Set the sentBy on your Listening point. See ListeningPoint.setSentBy()
>> Set the public address in Via.
>>
>> If you dont do the former,  the RI will throw an exception. It does a 
>> little integrity check.
>>
>> This may not be relevant to you but there is now an AddressResolver 
>> (only part of the RI and not the spec).  When the reciever gets a 
>> message it checks the via header to see if it can resolve the 
>> address. To do this it uses the AddressResolver. If the address 
>> cannot be resolved the message is dropped. Just a little security and 
>> integrity feature that I thought people might find useful. Also a way 
>> to deal with DNS SRV record lookups that the stack does not implement 
>> ( you can implement this Interface and register with the stack).
>>
>>> - set public address in Contact using API Jain-SIP's  
>>> addressFactory.createAddress(contactURI);
>>
>>
>> Yes
>>
>>> - set public address and port for  SDP c=  attribute.
>>
>>
>>
>> Yes.
>>
>>>
>>> ~manchi
>>>
>>>
>>>
>>> _______________________________________________
>>> nist-sip mailing list
>>> [email protected]
>>> http://www-x.antd.nist.gov/mailman/listinfo/nist-sip
>>
>
>
>
> _______________________________________________
> nist-sip mailing list
> [email protected]
> http://www-x.antd.nist.gov/mailman/listinfo/nist-sip
>


-- 
M. Ranganathan 

Advanced Networking Technologies Division,
National Institute of Standards and Technology (NIST),
100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. 
tel:301 975 3664 , fax:301 590 0932 http://w3.antd.nist.gov/
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