mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2024-12-19 06:27:32 +00:00
276 lines
7.1 KiB
Go
276 lines
7.1 KiB
Go
package mobile
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import (
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"encoding/hex"
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"encoding/json"
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"net"
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"regexp"
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"github.com/gologme/log"
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"github.com/yggdrasil-network/yggdrasil-go/src/config"
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"github.com/yggdrasil-network/yggdrasil-go/src/core"
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"github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc"
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"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
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"github.com/yggdrasil-network/yggdrasil-go/src/tun"
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"github.com/yggdrasil-network/yggdrasil-go/src/version"
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)
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// Yggdrasil mobile package is meant to "plug the gap" for mobile support, as
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// Gomobile will not create headers for Swift/Obj-C etc if they have complex
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// (non-native) types. Therefore for iOS we will expose some nice simple
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// functions. Note that in the case of iOS we handle reading/writing to/from TUN
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// in Swift therefore we use the "dummy" TUN interface instead.
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type Yggdrasil struct {
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core *core.Core
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iprwc *ipv6rwc.ReadWriteCloser
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config *config.NodeConfig
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multicast *multicast.Multicast
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tun *tun.TunAdapter // optional
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log MobileLogger
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logger *log.Logger
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}
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// StartAutoconfigure starts a node with a randomly generated config
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func (m *Yggdrasil) StartAutoconfigure() error {
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return m.StartJSON([]byte("{}"))
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}
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// StartJSON starts a node with the given JSON config. You can get JSON config
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// (rather than HJSON) by using the GenerateConfigJSON() function
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func (m *Yggdrasil) StartJSON(configjson []byte) error {
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setMemLimitIfPossible()
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logger := log.New(m.log, "", 0)
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logger.EnableLevel("error")
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logger.EnableLevel("warn")
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logger.EnableLevel("info")
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m.logger = logger
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m.config = config.GenerateConfig()
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if err := m.config.UnmarshalHJSON(configjson); err != nil {
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return err
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}
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// Set up the Yggdrasil node itself.
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{
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iprange := net.IPNet{
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IP: net.ParseIP("200::"),
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Mask: net.CIDRMask(7, 128),
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}
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options := []core.SetupOption{
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core.PeerFilter(func(ip net.IP) bool {
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return !iprange.Contains(ip)
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}),
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}
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for _, peer := range m.config.Peers {
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options = append(options, core.Peer{URI: peer})
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}
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for intf, peers := range m.config.InterfacePeers {
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for _, peer := range peers {
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options = append(options, core.Peer{URI: peer, SourceInterface: intf})
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}
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}
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for _, allowed := range m.config.AllowedPublicKeys {
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k, err := hex.DecodeString(allowed)
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if err != nil {
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panic(err)
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}
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options = append(options, core.AllowedPublicKey(k[:]))
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}
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for _, lAddr := range m.config.Listen {
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options = append(options, core.ListenAddress(lAddr))
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}
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var err error
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m.core, err = core.New(m.config.Certificate, logger, options...)
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if err != nil {
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panic(err)
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}
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address, subnet := m.core.Address(), m.core.Subnet()
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logger.Infof("Your public key is %s", hex.EncodeToString(m.core.PublicKey()))
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logger.Infof("Your IPv6 address is %s", address.String())
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logger.Infof("Your IPv6 subnet is %s", subnet.String())
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}
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// Set up the multicast module.
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if len(m.config.MulticastInterfaces) > 0 {
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var err error
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logger.Infof("Initializing multicast %s", "")
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options := []multicast.SetupOption{}
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for _, intf := range m.config.MulticastInterfaces {
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options = append(options, multicast.MulticastInterface{
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Regex: regexp.MustCompile(intf.Regex),
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Beacon: intf.Beacon,
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Listen: intf.Listen,
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Port: intf.Port,
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Priority: uint8(intf.Priority),
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Password: intf.Password,
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})
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}
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logger.Infof("Starting multicast %s", "")
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m.multicast, err = multicast.New(m.core, m.logger, options...)
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if err != nil {
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logger.Errorln("An error occurred starting multicast:", err)
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}
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}
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mtu := m.config.IfMTU
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m.iprwc = ipv6rwc.NewReadWriteCloser(m.core)
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if m.iprwc.MaxMTU() < mtu {
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mtu = m.iprwc.MaxMTU()
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}
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m.iprwc.SetMTU(mtu)
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return nil
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}
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// Send sends a packet to Yggdrasil. It should be a fully formed
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// IPv6 packet
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func (m *Yggdrasil) Send(p []byte) error {
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if m.iprwc == nil {
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return nil
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}
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_, _ = m.iprwc.Write(p)
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return nil
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}
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// Send sends a packet from given buffer to Yggdrasil. From first byte up to length.
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func (m *Yggdrasil) SendBuffer(p []byte, length int) error {
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if m.iprwc == nil {
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return nil
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}
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if len(p) < length {
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return nil
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}
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_, _ = m.iprwc.Write(p[:length])
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return nil
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}
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// Recv waits for and reads a packet coming from Yggdrasil. It
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// will be a fully formed IPv6 packet
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func (m *Yggdrasil) Recv() ([]byte, error) {
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if m.iprwc == nil {
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return nil, nil
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}
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var buf [65535]byte
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n, _ := m.iprwc.Read(buf[:])
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return buf[:n], nil
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}
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// Recv waits for and reads a packet coming from Yggdrasil to given buffer, returning size of packet
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func (m *Yggdrasil) RecvBuffer(buf []byte) (int, error) {
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if m.iprwc == nil {
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return 0, nil
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}
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n, _ := m.iprwc.Read(buf)
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return n, nil
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}
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// Stop the mobile Yggdrasil instance
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func (m *Yggdrasil) Stop() error {
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logger := log.New(m.log, "", 0)
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logger.EnableLevel("info")
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logger.Infof("Stopping the mobile Yggdrasil instance %s", "")
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if m.multicast != nil {
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logger.Infof("Stopping multicast %s", "")
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if err := m.multicast.Stop(); err != nil {
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return err
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}
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}
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logger.Infof("Stopping TUN device %s", "")
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if m.tun != nil {
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if err := m.tun.Stop(); err != nil {
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return err
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}
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}
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logger.Infof("Stopping Yggdrasil core %s", "")
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m.core.Stop()
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return nil
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}
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// Retry resets the peer connection timer and tries to dial them immediately.
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func (m *Yggdrasil) RetryPeersNow() {
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m.core.RetryPeersNow()
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}
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// GenerateConfigJSON generates mobile-friendly configuration in JSON format
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func GenerateConfigJSON() []byte {
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nc := config.GenerateConfig()
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nc.IfName = "none"
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if json, err := json.Marshal(nc); err == nil {
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return json
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}
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return nil
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}
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// GetAddressString gets the node's IPv6 address
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func (m *Yggdrasil) GetAddressString() string {
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ip := m.core.Address()
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return ip.String()
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}
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// GetSubnetString gets the node's IPv6 subnet in CIDR notation
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func (m *Yggdrasil) GetSubnetString() string {
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subnet := m.core.Subnet()
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return subnet.String()
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}
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// GetPublicKeyString gets the node's public key in hex form
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func (m *Yggdrasil) GetPublicKeyString() string {
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return hex.EncodeToString(m.core.GetSelf().Key)
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}
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// GetRoutingEntries gets the number of entries in the routing table
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func (m *Yggdrasil) GetRoutingEntries() int {
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return int(m.core.GetSelf().RoutingEntries)
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}
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func (m *Yggdrasil) GetPeersJSON() (result string) {
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peers := []struct {
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core.PeerInfo
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IP string
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}{}
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for _, v := range m.core.GetPeers() {
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var ip string
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if v.Key != nil {
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a := address.AddrForKey(v.Key)
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ip = net.IP(a[:]).String()
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}
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peers = append(peers, struct {
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core.PeerInfo
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IP string
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}{
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PeerInfo: v,
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IP: ip,
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})
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}
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if res, err := json.Marshal(peers); err == nil {
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return string(res)
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} else {
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return "{}"
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}
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}
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func (m *Yggdrasil) GetPathsJSON() (result string) {
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if res, err := json.Marshal(m.core.GetPaths()); err == nil {
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return string(res)
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} else {
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return "{}"
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}
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}
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func (m *Yggdrasil) GetTreeJSON() (result string) {
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if res, err := json.Marshal(m.core.GetTree()); err == nil {
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return string(res)
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} else {
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return "{}"
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}
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}
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// GetMTU returns the configured node MTU. This must be called AFTER Start.
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func (m *Yggdrasil) GetMTU() int {
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return int(m.core.MTU())
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}
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func GetVersion() string {
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return version.BuildVersion()
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}
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