Great work! Just an FYI, you might want to limit the dynamic allocation size in the bencode decoder: since it's untrusted input (either from torrent or announce

Great work! Just an FYI, you might want to limit the dynamic allocation size in the bencode decoder: since it's untrusted input (either from torrent or announce), a malicious input could DoS the client by requesting extremely large allocations during string parsing. A good upper bound could be the remaining length of the input, as a well formed torrent can't contain a string longer than the rest of the file.