How to obtain the IP address from a broadcast response?

I'm working on SNMP-autodetection of a scanner (for a SANE scanner driver, 
written in C). The detection works by sending a UDP broadcast SNMP request and 
checking all responses whether they belong to a supported scanner. Now, 
sending the broadcast and receiving responses works fine. 

Unfortunately, I can't find a way to get the IP address of the answering 
device. In the tutorial, the print_result function uses sp->peername, which of 
course in my case still points to the broadcast address "255.255.255.255"... 

I looked through all the documentation on the website, but could not find 
anything about how to get the IP address of the responder... 

The only thing that works somehow is (
   char *addr_string = transport->f_fmtaddr(transport,
       pdu->transport_data, pdu-> transport_data_length);
which prints
"UDP: [10.0.0.5]:161->[0.0.0.0]:36078"

So, apparently, the IP address is there, but the f_fmtaddr function is buried 
so deep in the snmplib/transports/ and so dependent on internal data 
structures (in particular, netsnmp_udp_addr_pair etc.), that the code there is 
basically unusable for copying to my driver and modifying it there.

Is there any high-level method to get only the IP address (IP4 and/or IP6) of 
the responder?

Thanks,
Reinhold
-- 
------------------------------------------------------------------
Reinhold Kainhofer, [email protected], http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org

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