// HandleFC handles incoming requests of packet 0xFC: EncryptionKeyResponse
func HandleFC(server *Server, sender *player.Player) {
pkt := new(packet.EncryptionKeyResponse)
pkt.ReadFrom(sender.Conn)
// Decrypt shared secret and token with server's private key.
var secret, token []byte
// var err error
secret, _ = rsa.DecryptPKCS1v15(rand.Reader, server.PrivateKey(), pkt.Secret)
token, _ = rsa.DecryptPKCS1v15(rand.Reader, server.PrivateKey(), pkt.Token)
// Ensure token matches
if !bytes.Equal(token, sender.Token) {
log.Println("Tokens don't match.")
r := &packet.Disconnect{Reason: ReasonPiratedGame}
r.WriteTo(sender.Conn)
return
}
// Ensure player is legit
if !server.CheckUser(sender.Name, secret) {
log.Println("Failed to verify username!")
r := packet.Disconnect{"Failed to verify username!"}
r.WriteTo(sender.Conn)
return
}
// Send empty EncryptionKeyResponse
r := new(packet.EncryptionKeyResponse)
r.WriteTo(sender.Conn)
// Start AES/CFB8 stream encryption
sender.OnlineMode(true, secret)
log.Println("Enabling encryption.")
}
// HandleCD handles incoming requests of packet 0xCD: ClientStatuses
func HandleCD(server *Server, sender *player.Player) {
pkt := new(packet.ClientStatuses)
pkt.ReadFrom(sender.Conn)
switch pkt.Payload {
case 0:
server.HandleLogin(sender)
case 1:
default:
log.Println("Weird packet 0xCB payload:", pkt.Payload)
r := packet.Disconnect{"Weird packet 0xCB payload"}
r.WriteTo(sender.Conn)
}
}
// HandleFE handles incoming requests of packet 0xFE: ServerListPing
func HandleFE(server *Server, sender *player.Player) {
pkt := new(packet.ServerListPing)
pkt.ReadFrom(sender.Conn)
if pkt.Magic != 1 {
s := "Invalid %#x packet. Field Magic should be 1, got %d."
reason := fmt.Sprintf(s, pkt.Id(), pkt.Magic)
resp := packet.Disconnect{reason}
resp.WriteTo(sender.Conn)
return
}
in := fmt.Sprintf("%d", server.Players.Len())
max := server.config.Get("server.max_players")
resp := ping.Ping(ping.Prepare(server.Motd, in, max))
resp.WriteTo(sender.Conn)
}