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yggdrasil-go/contrib/mobile/mobile.go
Paul Donald f56f9c124c
Minor Fixes (#1107)
* Minor comment fixes.

* Optimize PeerEntry for memory efficiency

* Improve NodeConfig for memory alignment
2024-05-27 21:57:28 +01:00

270 lines
7.0 KiB
Go

package mobile
import (
"encoding/hex"
"encoding/json"
"net"
"regexp"
"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 {
setMemLimitIfPossible()
logger := log.New(m.log, "", 0)
logger.EnableLevel("error")
logger.EnableLevel("warn")
logger.EnableLevel("info")
m.logger = logger
m.config = config.GenerateConfig()
if err := m.config.UnmarshalHJSON(configjson); err != nil {
return err
}
// Set up 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 _, lAddr := range m.config.Listen {
options = append(options, core.ListenAddress(lAddr))
}
var err error
m.core, err = core.New(m.config.Certificate, logger, options...)
if err != nil {
panic(err)
}
address, subnet := m.core.Address(), m.core.Subnet()
logger.Infof("Your public key is %s", hex.EncodeToString(m.core.PublicKey()))
logger.Infof("Your IPv6 address is %s", address.String())
logger.Infof("Your IPv6 subnet is %s", subnet.String())
}
// Set up the multicast module.
if len(m.config.MulticastInterfaces) > 0 {
var err error
logger.Infof("Initializing multicast %s", "")
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),
Password: intf.Password,
})
}
logger.Infof("Starting multicast %s", "")
m.multicast, err = multicast.New(m.core, m.logger, options...)
if err != nil {
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("Stopping the mobile Yggdrasil instance %s", "")
if m.multicast != nil {
logger.Infof("Stopping multicast %s", "")
if err := m.multicast.Stop(); err != nil {
return err
}
}
logger.Infof("Stopping TUN device %s", "")
if m.tun != nil {
if err := m.tun.Stop(); err != nil {
return err
}
}
logger.Infof("Stopping Yggdrasil core %s", "")
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() {
var ip string
if v.Key != nil {
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()
}