package mobile import ( "encoding/hex" "encoding/json" "net" "regexp" "runtime/debug" "github.com/gologme/log" "github.com/yggdrasil-network/yggdrasil-go/src/address" "github.com/yggdrasil-network/yggdrasil-go/src/config" "github.com/yggdrasil-network/yggdrasil-go/src/core" "github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc" "github.com/yggdrasil-network/yggdrasil-go/src/multicast" "github.com/yggdrasil-network/yggdrasil-go/src/tun" "github.com/yggdrasil-network/yggdrasil-go/src/version" _ "golang.org/x/mobile/bind" ) // Yggdrasil mobile package is meant to "plug the gap" for mobile support, as // Gomobile will not create headers for Swift/Obj-C etc if they have complex // (non-native) types. Therefore for iOS we will expose some nice simple // functions. Note that in the case of iOS we handle reading/writing to/from TUN // in Swift therefore we use the "dummy" TUN interface instead. type Yggdrasil struct { core *core.Core iprwc *ipv6rwc.ReadWriteCloser config *config.NodeConfig multicast *multicast.Multicast tun *tun.TunAdapter // optional log MobileLogger logger *log.Logger } // StartAutoconfigure starts a node with a randomly generated config func (m *Yggdrasil) StartAutoconfigure() error { return m.StartJSON([]byte("{}")) } // StartJSON starts a node with the given JSON config. You can get JSON config // (rather than HJSON) by using the GenerateConfigJSON() function func (m *Yggdrasil) StartJSON(configjson []byte) error { debug.SetMemoryLimit(1024 * 1024 * 40) logger := log.New(m.log, "", 0) logger.EnableLevel("error") logger.EnableLevel("warn") logger.EnableLevel("info") m.config = config.GenerateConfig() if err := m.config.UnmarshalHJSON(configjson); err != nil { return err } // Setup the Yggdrasil node itself. { options := []core.SetupOption{} for _, peer := range m.config.Peers { options = append(options, core.Peer{URI: peer}) } for intf, peers := range m.config.InterfacePeers { for _, peer := range peers { options = append(options, core.Peer{URI: peer, SourceInterface: intf}) } } for _, allowed := range m.config.AllowedPublicKeys { k, err := hex.DecodeString(allowed) if err != nil { panic(err) } options = append(options, core.AllowedPublicKey(k[:])) } for _, root := range m.config.RootCertificates { options = append(options, core.RootCertificate(*root)) } var err error m.core, err = core.New(m.config.Certificate, logger, options...) if err != nil { panic(err) } } // Setup the multicast module. if len(m.config.MulticastInterfaces) > 0 { var err error options := []multicast.SetupOption{} for _, intf := range m.config.MulticastInterfaces { options = append(options, multicast.MulticastInterface{ Regex: regexp.MustCompile(intf.Regex), Beacon: intf.Beacon, Listen: intf.Listen, Port: intf.Port, Priority: uint8(intf.Priority), }) } m.multicast, err = multicast.New(m.core, m.logger, options...) if err != nil { m.logger.Errorln("An error occurred starting multicast:", err) } } mtu := m.config.IfMTU m.iprwc = ipv6rwc.NewReadWriteCloser(m.core) if m.iprwc.MaxMTU() < mtu { mtu = m.iprwc.MaxMTU() } m.iprwc.SetMTU(mtu) return nil } // Send sends a packet to Yggdrasil. It should be a fully formed // IPv6 packet func (m *Yggdrasil) Send(p []byte) error { if m.iprwc == nil { return nil } _, _ = m.iprwc.Write(p) return nil } // Send sends a packet from given buffer to Yggdrasil. From first byte up to length. func (m *Yggdrasil) SendBuffer(p []byte, length int) error { if m.iprwc == nil { return nil } if len(p) < length { return nil } _, _ = m.iprwc.Write(p[:length]) return nil } // Recv waits for and reads a packet coming from Yggdrasil. It // will be a fully formed IPv6 packet func (m *Yggdrasil) Recv() ([]byte, error) { if m.iprwc == nil { return nil, nil } var buf [65535]byte n, _ := m.iprwc.Read(buf[:]) return buf[:n], nil } // Recv waits for and reads a packet coming from Yggdrasil to given buffer, returning size of packet func (m *Yggdrasil) RecvBuffer(buf []byte) (int, error) { if m.iprwc == nil { return 0, nil } n, _ := m.iprwc.Read(buf) return n, nil } // Stop the mobile Yggdrasil instance func (m *Yggdrasil) Stop() error { logger := log.New(m.log, "", 0) logger.EnableLevel("info") logger.Infof("Stop the mobile Yggdrasil instance %s", "") if err := m.multicast.Stop(); err != nil { return err } if m.tun != nil { if err := m.tun.Stop(); err != nil { return err } } m.core.Stop() return nil } // Retry resets the peer connection timer and tries to dial them immediately. func (m *Yggdrasil) RetryPeersNow() { m.core.RetryPeersNow() } // GenerateConfigJSON generates mobile-friendly configuration in JSON format func GenerateConfigJSON() []byte { nc := config.GenerateConfig() nc.IfName = "none" if json, err := json.Marshal(nc); err == nil { return json } return nil } // GetAddressString gets the node's IPv6 address func (m *Yggdrasil) GetAddressString() string { ip := m.core.Address() return ip.String() } // GetSubnetString gets the node's IPv6 subnet in CIDR notation func (m *Yggdrasil) GetSubnetString() string { subnet := m.core.Subnet() return subnet.String() } // GetPublicKeyString gets the node's public key in hex form func (m *Yggdrasil) GetPublicKeyString() string { return hex.EncodeToString(m.core.GetSelf().Key) } // GetRoutingEntries gets the number of entries in the routing table func (m *Yggdrasil) GetRoutingEntries() int { return int(m.core.GetSelf().RoutingEntries) } func (m *Yggdrasil) GetPeersJSON() (result string) { peers := []struct { core.PeerInfo IP string }{} for _, v := range m.core.GetPeers() { a := address.AddrForKey(v.Key) ip := net.IP(a[:]).String() peers = append(peers, struct { core.PeerInfo IP string }{ PeerInfo: v, IP: ip, }) } if res, err := json.Marshal(peers); err == nil { return string(res) } else { return "{}" } } func (m *Yggdrasil) GetPathsJSON() (result string) { if res, err := json.Marshal(m.core.GetPaths()); err == nil { return string(res) } else { return "{}" } } func (m *Yggdrasil) GetTreeJSON() (result string) { if res, err := json.Marshal(m.core.GetTree()); err == nil { return string(res) } else { return "{}" } } // GetMTU returns the configured node MTU. This must be called AFTER Start. func (m *Yggdrasil) GetMTU() int { return int(m.core.MTU()) } func GetVersion() string { return version.BuildVersion() }