Potential panic caused by illegal incoming packet

[hMihaiDavid]

At the begining of krpc.go:handleRequest(), several unchecked type assertions are made to the values of the parsed bencoded udp packet.

(line 428) t := response["t"].(string)
(line 445) id := a["id"].(string)
... and others ...

An illegal packet that contains a bencode integer instead of a string in the id field would trigger a panic because the type assertion is not checked and recover() is not used. Therefore a malicious packet can crash the process.

I don't know how much of a problem this is though.