package server import ( "crypto" "fmt" "net" "os" "path/filepath" "strings" "sync" "github.com/hlandau/buildinfo" "github.com/hlandau/xlog" "github.com/miekg/dns" "github.com/namecoin/ncdns/backend" "github.com/namecoin/ncdns/namecoin" "gopkg.in/hlandau/madns.v2" ) var log, Log = xlog.New("ncdns.server") type Server struct { cfg Config engine madns.Engine namecoinConn namecoin.Conn mux *dns.ServeMux udpServer *dns.Server udpConn *net.UDPConn tcpServer *dns.Server tcpListener net.Listener wgStart sync.WaitGroup } type Config struct { Bind string `default:":53" usage:"Address to bind to (e.g. 0.0.0.0:53)"` PublicKey string `default:"" usage:"Path to the DNSKEY KSK public key file"` PrivateKey string `default:"" usage:"Path to the KSK's corresponding private key file"` ZonePublicKey string `default:"" usage:"Path to the DNSKEY ZSK public key file; if one is not specified, a temporary one is generated on startup and used only for the duration of that process"` ZonePrivateKey string `default:"" usage:"Path to the ZSK's corresponding private key file"` NamecoinRPCUsername string `default:"" usage:"Namecoin RPC username"` NamecoinRPCPassword string `default:"" usage:"Namecoin RPC password"` NamecoinRPCAddress string `default:"127.0.0.1:8336" usage:"Namecoin RPC server address"` NamecoinRPCCookiePath string `default:"" usage:"Namecoin RPC cookie path (if set, used instead of password)"` NamecoinRPCTimeout int `default:"1500" usage:"Timeout (in milliseconds) for Namecoin RPC requests"` CacheMaxEntries int `default:"100" usage:"Maximum name cache entries"` SelfName string `default:"" usage:"The FQDN of this nameserver. If empty, a pseudo-hostname is generated."` SelfIP string `default:"127.127.127.127" usage:"The canonical IP address for this service"` HTTPListenAddr string `default:"" usage:"Address for webserver to listen at (default: disabled)"` CanonicalSuffix string `default:"bit" usage:"Suffix to advertise via HTTP"` CanonicalNameservers string `default:"" usage:"Comma-separated list of nameservers to use for NS records. If blank, SelfName (or autogenerated pseudo-hostname) is used."` canonicalNameservers []string Hostmaster string `default:"" usage:"Hostmaster e. mail address"` VanityIPs string `default:"" usage:"Comma separated list of IP addresses to place in A/AAAA records at the zone apex (default: don't add any records)"` vanityIPs []net.IP TplSet string `default:"std" usage:"The template set to use"` TplPath string `default:"" usage:"The path to the tpl directory (empty: autodetect)"` ConfigDir string // path to interpret filenames relative to } func (cfg *Config) cpath(s string) string { return filepath.Join(cfg.ConfigDir, s) } var ncdnsVersion string func New(cfg *Config) (s *Server, err error) { ncdnsVersion = buildinfo.VersionSummary("github.com/namecoin/ncdns", "ncdns") s = &Server{ cfg: *cfg, namecoinConn: namecoin.Conn{ Username: cfg.NamecoinRPCUsername, Password: cfg.NamecoinRPCPassword, Server: cfg.NamecoinRPCAddress, }, } if s.cfg.NamecoinRPCCookiePath != "" { s.namecoinConn.GetAuth = cookieRetriever(s.cfg.NamecoinRPCCookiePath) } if s.cfg.CanonicalNameservers != "" { s.cfg.canonicalNameservers = strings.Split(s.cfg.CanonicalNameservers, ",") for i := range s.cfg.canonicalNameservers { s.cfg.canonicalNameservers[i] = dns.Fqdn(s.cfg.canonicalNameservers[i]) } } if s.cfg.VanityIPs != "" { vanityIPs := strings.Split(s.cfg.VanityIPs, ",") for _, ips := range vanityIPs { ip := net.ParseIP(ips) if ip == nil { return nil, fmt.Errorf("Couldn't parse IP: %s", ips) } s.cfg.vanityIPs = append(s.cfg.vanityIPs, ip) } } b, err := backend.New(&backend.Config{ NamecoinConn: s.namecoinConn, NamecoinTimeout: cfg.NamecoinRPCTimeout, CacheMaxEntries: cfg.CacheMaxEntries, SelfIP: cfg.SelfIP, Hostmaster: cfg.Hostmaster, CanonicalNameservers: s.cfg.canonicalNameservers, VanityIPs: s.cfg.vanityIPs, }) if err != nil { return } ecfg := &madns.EngineConfig{ Backend: b, VersionString: ncdnsVersion, } // key setup if cfg.PublicKey != "" { ecfg.KSK, ecfg.KSKPrivate, err = s.loadKey(cfg.PublicKey, cfg.PrivateKey) if err != nil { return nil, err } } if cfg.ZonePublicKey != "" { ecfg.ZSK, ecfg.ZSKPrivate, err = s.loadKey(cfg.ZonePublicKey, cfg.ZonePrivateKey) if err != nil { return nil, err } } if ecfg.KSK != nil && ecfg.ZSK == nil { return nil, fmt.Errorf("Must specify ZSK if KSK is specified") } s.engine, err = madns.NewEngine(ecfg) if err != nil { return } s.mux = dns.NewServeMux() s.mux.Handle(".", s.engine) tcpAddr, err := net.ResolveTCPAddr("tcp", s.cfg.Bind) if err != nil { return } s.tcpListener, err = net.ListenTCP("tcp", tcpAddr) if err != nil { return } udpAddr, err := net.ResolveUDPAddr("udp", s.cfg.Bind) if err != nil { return } s.udpConn, err = net.ListenUDP("udp", udpAddr) if err != nil { return } if cfg.HTTPListenAddr != "" { err = webStart(cfg.HTTPListenAddr, s) if err != nil { return } } return } func (s *Server) loadKey(fn, privateFn string) (k *dns.DNSKEY, privatek crypto.PrivateKey, err error) { fn = s.cfg.cpath(fn) privateFn = s.cfg.cpath(privateFn) f, err := os.Open(fn) if err != nil { return } rr, err := dns.ReadRR(f, fn) if err != nil { return } k, ok := rr.(*dns.DNSKEY) if !ok { err = fmt.Errorf("Loaded record from key file, but it wasn't a DNSKEY") return } privatef, err := os.Open(privateFn) if err != nil { return } privatek, err = k.ReadPrivateKey(privatef, privateFn) log.Fatale(err) return } func (s *Server) Start() error { s.wgStart.Add(2) s.udpServer = s.runListener("udp") s.tcpServer = s.runListener("tcp") s.wgStart.Wait() log.Info("Listeners started") return s.StartBackgroundTasks() } func (s *Server) doRunListener(ds *dns.Server) { err := ds.ActivateAndServe() log.Fatale(err) } func (s *Server) runListener(net string) *dns.Server { ds := &dns.Server{ Addr: s.cfg.Bind, Net: net, Handler: s.mux, NotifyStartedFunc: func() { s.wgStart.Done() }, } switch net { case "tcp": ds.Listener = s.tcpListener case "udp": ds.PacketConn = s.udpConn default: panic("unreachable") } go s.doRunListener(ds) return ds } func (s *Server) Stop() error { return nil // TODO }