Re: [Discussion] Retrieving a CID

[Richard Carlson <rcarlson@xxxxxxxxxxxxx>]

Martin;

Have you tried using the  web100_connection_from_socket() call instead of 
the web100_get_connection_spec() call?  You pass in the socket descriptor 
for that connection instead of individual addr/port values.  Of course you 
need access to the SD.

Rich

At 12:38 PM 10/24/2005, Martin Röhricht wrote:
> Am Montag, 24. Oktober 2005 16:21 schrieb John Heffner:
> > web100_connection_find() only returns a single connection, not a list
> > of connections, so it required a full match on the spec.  What you need
> > to do is step through the list of all connections in a loop doing a
> > match on just the parts of the spec you want.  See below for an
> > example.  (You seem not to have a remote port, but I'm assuming you
> > do.)
>
> Okay, that's something I already worried about. Currently the local port
> number is the only field that I do not know the value of in advance. I use
> iperf to establish a transfer between two hosts, but I couldn't figure out
> how to set the outgoing port for iperf. Maybe somebody does know how to do
> that?
>
> > Incidentally, the equivalent python code is:
> >
> > import Web100
> > agent = Web100.Web100Agent()
> > cl = agent.connection_match('192.168.0.17', None, '192.168.0.18',
> > RemotePort)
> > cid = cl[0].cid
> >
> > It works pretty well for this if you can use it. :-)
>
> Mmh, I would like to use only one small C program ;-)
>
> > conn = web100_connection_head(agent);
> > while (conn) {
> >       spec2 = web100_get_connection_spec(conn);
>         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I think this has to be
>         web100_get_connection_spec(conn, spec2);
>
> >       if (spec->src_addr == spec2->src_addr && spec->dst_addr ==
> > spec2->dst_addr && spec->dst_port == spec2->dst_port)
> >               break;
> > }
> > if (conn == NULL) {
> >       printf("connection not found\n");
> >       return 1;
> > }
>
> Unfortunately I never get to the point "connection not found" -- it looks 
> like
> I'm stuck in an infinite loop ...
>
> Is this part here right to set the spec information:
> -----------------------8<----------------------
> const unsigned int      LocalPort = 0;
> const char              LocalAddress[16] = "141.3.17.217";
> const unsigned int      RemotePort = 1980;
> const char              RemoteAddress[16] = "84.163.232.249";
>
> struct web100_connection_spec   *spec;
> struct  in_addr src_t, dst_t;
> [...]
> inet_aton(LocalAddress, &src_t);
> spec->src_addr = ntohl(src_t.s_addr);
> inet_aton(RemoteAddress, &dst_t);
> spec->dst_addr = ntohl(dst_t.s_addr);
> spec->src_port = LocalPort;
> spec->dst_port = RemotePort;
> -----------------------8<----------------------
>
> Mmh, the only thing I would like to do is to get the CID for given addresses
> and ports. What can I do?
>
> Martin
>
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------------------------------------



Richard A. Carlson                              e-mail: RCarlson@xxxxxxxxxxxxx
Network Engineer                                phone:  (734) 352-7043
Internet2                                       fax:    (734) 913-4255
1000 Oakbrook Dr; Suite 300
Ann Arbor,  MI  48104 


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