Re: [Linphone-developers] bug with oRTP sessions

[Simon Morlat]

Hello,

I didn't know the OS was able to bind several socket on the same port.
I think you should add to your application the ability to remember what RTP 
ports are being used what ports are free.
Otherwise removing the setsockopt() call with SO_REUSEADDR option from 
src/rtpsession_inet.c will cause rtp_session_set_local_addr to return an 
error if the socket is busy. The drawback is that even if a socket is closed, 
you'll not be able to re-use it until a timeout occurs (this is controlled by 
the kernel).

Simon

Le mercredi 29 novembre 2006 11:18, Camille Douine a écrit :
> Dear all,
>
> my team is working on an application using oRTP stack. We need to launch
> this application several time concurrently. We noticed that the same UDP
> port could be bound (using rtp_session_set_local_addr() ) to several RTP
> sessions, causing some mixing.
>
> I wrote a small program that shows that two sessions can be bound to the
> same port (see below for the source code and the results).
>
> We would need your help to answer the question : how can we detect if an
> UDP port is already in use and make sure to bind RTP session on
> distincts UDP ports?
>
> We are using FC 5 as operating system.
>
> Regards, Camille Douine
> IVèS
>
> > *Here is the source :*
> >
> >    # include <ortp/ortp.h>
> >    # include <stdio.h>
> >
> >    int main(){
> >
> >    RtpSession* session1;
> >    RtpSession* session2;
> >    int n,m;
> >
> >    ortp_init();
> >
> >    session1 = rtp_session_new(3);
> >    n = rtp_session_set_local_addr(session1,"0.0.0.0",8357);
> >    printf("local add1 : %d \n",n);
> >
> >    session2 = rtp_session_new(3);
> >    m = rtp_session_set_local_addr(session2,"0.0.0.0",8357);
> >    printf("local add2 : %d \n",m);
> >    }
> >
> > *Results :*
> >
> >    local add1 : 0
> >    local add2 : 0
>
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