It will be very helpful if I get the source code of detecting the sinkhole attack by checking either the routing pattern or hopcount of the nodes. Expecting ur reply. Thank you

In computer networking, a packet drop attack or blackhole attack is a type of denial-of-service attack in which a router that is supposed to relay packets instead discards them. This usually occurs from a router becoming compromised from a number of different causes. One cause mentioned in research is through a denial-of-service attack on the router using a known DDoS tool.[1] Because packets are routinely dropped from a lossy network, the packet drop attack is very hard to detect and prevent.

The malicious router can also accomplish this attack selectively, e.g. by dropping packets for a particular network destination, at a certain time of the day, a packet every n packets or every t seconds, or a randomly selected portion of the packets. This is rather called a greyhound attack. If the malicious router attempts to drop all packets that come in, the attack can actually be discovered fairly quickly through common networking tools such as traceroute. Also, when other routers notice that the compromised router is dropping all traffic, they will generally begin to remove that router from their forwarding tables and eventually no traffic will flow to the attack. However, if the malicious router begins dropping packets on a specific time period or over every n packets, it is often harder to detect because some traffic still flows across the network.