char* sr_find_next_hop(struct sr_instance* sr, uint32_t dest)
{
struct sr_rt* rt_walker = 0;
struct sr_rt* next_hop = 0;
int max_prefix = 0;
int temp = 0;
if(sr->routing_table == 0)
{
printf(" *warning* Routing table empty \n");
return 0;
}
rt_walker = sr->routing_table;
while(rt_walker)
{
sr_print_routing_entry(rt_walker);
temp = prefix_match(ntohl((rt_walker->dest).s_addr),
ntohl(dest),
ntohl((rt_walker->mask).s_addr));
printf("%d\n", temp);
if (temp > max_prefix)
{
next_hop = rt_walker;
max_prefix = temp;
}
rt_walker = rt_walker->next;
}
if (!next_hop)
return 0;
printf("find a interface=%s\n",next_hop->interface);
return next_hop->interface;
}
void sr_print_routing_table(struct sr_instance* sr)
{
struct sr_rt* rt_walker = 0;
if(sr->routing_table == 0)
{
fprintf(stderr," *warning* Routing table empty \n");
return;
}
fprintf(stderr,"Destination\tGateway\t\tMask\tIface\n");
rt_walker = sr->routing_table;
sr_print_routing_entry(rt_walker);
while(rt_walker->next)
{
rt_walker = rt_walker->next;
sr_print_routing_entry(rt_walker);
}
} /* -- sr_print_routing_table -- */
