[ris-int] how to get the next hop from ris raw data

Hi Lorenzo, Erik,

I have to parse RIS raw data (in C) for a SG project.

Bgpdump.c sort of shows how to do this, but I don't quite understand
what's happening with next hop in the show_attr function:

   if (attr->mp_info->announce[AFI_IP6][SAFI_UNICAST])
   {
	   printf("(IPv6 Unicast)\n");
   	   printf("NEXT_HOP: %s\n",inet_ntop(AF_INET6,&attr->mp_info->announce[AFI_IP6][SAFI_UNICAST]->nexthop.v6_addr,buf,128));
           if (attr->mp_info->announce[AFI_IP6][SAFI_UNICAST]->nexthop_len==32)
		printf("NEXT_HOP: %s\n",inet_ntop(AF_INET6,&attr->mp_info->announce[AFI_IP6][SAFI_UNICAST]->nexthop_local.v6_addr,buf,128));
   }


(and the same for IPv4 unicast)


What is this special case where ... nexthop_len==32 ?
If I read this piece of C correctly, it would result in two
next hop addresses being printed ?????

Can one of you explain?

Thanks,

-- Rene