Hello all ns2 users:
I'm a user of your DYMOUM soft. When I use DYMOUM 0.3 for a simulation
in ns-2, I found a bug in it.
In file dymoum0,3/ns/dymo_um.cc from line 244 to line 262
244 dest_addr.s_addr = ih->daddr();
245 rtable_entry_t *entry = rtable_find(dest_addr);
246 if (!entry || entry->rt_state == RT_INVALID) {
247 // If I am the originating node, then a route discovery
248 // must be performed
249 if (ih->saddr() == ra_addr_) {
250 packet_queue_add(p, dest_addr);
251 route_discovery(dest_addr);
252 }
253 // Else we must send a RERR message to the source if
254 // the route has been previously used
255 else {
256 if (entry->rt_is_used)
257 rerr_send(dest_addr, NET_DIAMETER, entry);
258 drop(p, DROP_RTR_NO_ROUTE);
259 }
260 schedule_next_event();
261 return;
262 }
Notice in line 256, if(entry->rt_is_used) the variable "entry" here may be
NULL, if "entry" is NULL, "entry->rt_is_used" will cause a segmentation
fault.
I think the line 256 should be modified like this:
if(entry && entry->rt_is_used)
--
Wayne Shu
