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forked from extern/smegmesh
smegmesh/pkg/mesh/manager.go

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package mesh
import (
"errors"
"fmt"
"sync"
"github.com/tim-beatham/wgmesh/pkg/conf"
"github.com/tim-beatham/wgmesh/pkg/ip"
"github.com/tim-beatham/wgmesh/pkg/lib"
logging "github.com/tim-beatham/wgmesh/pkg/log"
"github.com/tim-beatham/wgmesh/pkg/wg"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
)
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type MeshManager interface {
CreateMesh(port int) (string, error)
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AddMesh(params *AddMeshParams) error
HasChanges(meshid string) bool
GetMesh(meshId string) MeshProvider
GetPublicKey() *wgtypes.Key
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AddSelf(params *AddSelfParams) error
LeaveMesh(meshId string) error
GetSelf(meshId string) (MeshNode, error)
ApplyConfig() error
SetDescription(description string) error
SetAlias(alias string) error
SetService(service string, value string) error
RemoveService(service string) error
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UpdateTimeStamp() error
GetClient() *wgctrl.Client
GetMeshes() map[string]MeshProvider
Prune() error
Close() error
GetMonitor() MeshMonitor
GetNode(string, string) MeshNode
GetRouteManager() RouteManager
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}
type MeshManagerImpl struct {
lock sync.RWMutex
Meshes map[string]MeshProvider
RouteManager RouteManager
Client *wgctrl.Client
// HostParameters contains information that uniquely locates
// the node in the mesh network.
HostParameters *HostParameters
conf *conf.WgMeshConfiguration
meshProviderFactory MeshProviderFactory
nodeFactory MeshNodeFactory
configApplyer MeshConfigApplyer
idGenerator lib.IdGenerator
ipAllocator ip.IPAllocator
interfaceManipulator wg.WgInterfaceManipulator
Monitor MeshMonitor
OnDelete func(MeshProvider)
}
// GetRouteManager implements MeshManager.
func (m *MeshManagerImpl) GetRouteManager() RouteManager {
return m.RouteManager
}
// RemoveService implements MeshManager.
func (m *MeshManagerImpl) RemoveService(service string) error {
for _, mesh := range m.Meshes {
err := mesh.RemoveService(m.HostParameters.GetPublicKey(), service)
if err != nil {
return err
}
}
return nil
}
// SetService implements MeshManager.
func (m *MeshManagerImpl) SetService(service string, value string) error {
for _, mesh := range m.Meshes {
err := mesh.AddService(m.HostParameters.GetPublicKey(), service, value)
if err != nil {
return err
}
}
return nil
}
func (m *MeshManagerImpl) GetNode(meshid, nodeId string) MeshNode {
mesh, ok := m.Meshes[meshid]
if !ok {
return nil
}
node, err := mesh.GetNode(nodeId)
if err != nil {
return nil
}
return node
}
// GetMonitor implements MeshManager.
func (m *MeshManagerImpl) GetMonitor() MeshMonitor {
return m.Monitor
}
// Prune implements MeshManager.
func (m *MeshManagerImpl) Prune() error {
for _, mesh := range m.Meshes {
err := mesh.Prune(m.conf.PruneTime)
if err != nil {
return err
}
}
return nil
}
// CreateMesh: Creates a new mesh, stores it and returns the mesh id
func (m *MeshManagerImpl) CreateMesh(port int) (string, error) {
meshId, err := m.idGenerator.GetId()
var ifName string = ""
if err != nil {
return "", err
}
if !m.conf.StubWg {
ifName, err = m.interfaceManipulator.CreateInterface(port, m.HostParameters.PrivateKey)
if err != nil {
return "", fmt.Errorf("error creating mesh: %w", err)
}
}
nodeManager, err := m.meshProviderFactory.CreateMesh(&MeshProviderFactoryParams{
DevName: ifName,
Port: port,
Conf: m.conf,
Client: m.Client,
MeshId: meshId,
})
if err != nil {
return "", fmt.Errorf("error creating mesh: %w", err)
}
m.lock.Lock()
m.Meshes[meshId] = nodeManager
m.lock.Unlock()
return meshId, nil
}
type AddMeshParams struct {
MeshId string
WgPort int
MeshBytes []byte
}
// AddMesh: Add the mesh to the list of meshes
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func (m *MeshManagerImpl) AddMesh(params *AddMeshParams) error {
var ifName string
var err error
if !m.conf.StubWg {
ifName, err = m.interfaceManipulator.CreateInterface(params.WgPort, m.HostParameters.PrivateKey)
if err != nil {
return err
}
}
meshProvider, err := m.meshProviderFactory.CreateMesh(&MeshProviderFactoryParams{
DevName: ifName,
Port: params.WgPort,
Conf: m.conf,
Client: m.Client,
MeshId: params.MeshId,
})
if err != nil {
return err
}
err = meshProvider.Load(params.MeshBytes)
if err != nil {
return err
}
m.lock.Lock()
m.Meshes[params.MeshId] = meshProvider
m.lock.Unlock()
return nil
}
// HasChanges returns true if the mesh has changes
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func (m *MeshManagerImpl) HasChanges(meshId string) bool {
return m.Meshes[meshId].HasChanges()
}
// GetMesh returns the mesh with the given meshid
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func (m *MeshManagerImpl) GetMesh(meshId string) MeshProvider {
theMesh := m.Meshes[meshId]
return theMesh
}
// GetPublicKey: Gets the public key of the WireGuard mesh
func (s *MeshManagerImpl) GetPublicKey() *wgtypes.Key {
if s.conf.StubWg {
zeroedKey := make([]byte, wgtypes.KeyLen)
return (*wgtypes.Key)(zeroedKey)
}
key := s.HostParameters.PrivateKey.PublicKey()
return &key
}
type AddSelfParams struct {
// MeshId is the ID of the mesh to add this instance to
MeshId string
// WgPort is the WireGuard port to advertise
WgPort int
// Endpoint is the alias of the machine to send routable packets
Endpoint string
}
// AddSelf adds this host to the mesh
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func (s *MeshManagerImpl) AddSelf(params *AddSelfParams) error {
mesh := s.GetMesh(params.MeshId)
if mesh == nil {
return fmt.Errorf("addself: mesh %s does not exist", params.MeshId)
}
if params.WgPort == 0 && !s.conf.StubWg {
device, err := mesh.GetDevice()
if err != nil {
return err
}
params.WgPort = device.ListenPort
}
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pubKey := s.HostParameters.PrivateKey.PublicKey()
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nodeIP, err := s.ipAllocator.GetIP(pubKey, params.MeshId)
if err != nil {
return err
}
node := s.nodeFactory.Build(&MeshNodeFactoryParams{
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PublicKey: &pubKey,
NodeIP: nodeIP,
WgPort: params.WgPort,
Endpoint: params.Endpoint,
})
if !s.conf.StubWg {
device, err := mesh.GetDevice()
if err != nil {
return fmt.Errorf("failed to get device %w", err)
}
err = s.interfaceManipulator.AddAddress(device.Name, fmt.Sprintf("%s/64", nodeIP))
if err != nil {
return fmt.Errorf("addSelf: failed to add address to dev %w", err)
}
}
s.Meshes[params.MeshId].AddNode(node)
return s.RouteManager.UpdateRoutes()
}
// LeaveMesh leaves the mesh network
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func (s *MeshManagerImpl) LeaveMesh(meshId string) error {
mesh := s.GetMesh(meshId)
if mesh == nil {
return fmt.Errorf("mesh %s does not exist", meshId)
}
var err error
s.RouteManager.RemoveRoutes(meshId)
err = mesh.RemoveNode(s.HostParameters.GetPublicKey())
if err != nil {
return err
}
if s.OnDelete != nil {
s.OnDelete(mesh)
}
s.lock.Lock()
delete(s.Meshes, meshId)
s.lock.Unlock()
if !s.conf.StubWg {
device, err := mesh.GetDevice()
if err != nil {
return err
}
err = s.interfaceManipulator.RemoveInterface(device.Name)
if err != nil {
return err
}
}
return err
}
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func (s *MeshManagerImpl) GetSelf(meshId string) (MeshNode, error) {
meshInstance, ok := s.Meshes[meshId]
if !ok {
return nil, fmt.Errorf("mesh %s does not exist", meshId)
}
logging.Log.WriteInfof(s.HostParameters.GetPublicKey())
node, err := meshInstance.GetNode(s.HostParameters.GetPublicKey())
if err != nil {
return nil, errors.New("the node doesn't exist in the mesh")
}
return node, nil
}
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func (s *MeshManagerImpl) ApplyConfig() error {
if s.conf.StubWg {
return nil
}
err := s.configApplyer.ApplyConfig()
if err != nil {
return err
}
return nil
}
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func (s *MeshManagerImpl) SetDescription(description string) error {
meshes := s.GetMeshes()
for _, mesh := range meshes {
if mesh.NodeExists(s.HostParameters.GetPublicKey()) {
err := mesh.SetDescription(s.HostParameters.GetPublicKey(), description)
if err != nil {
return err
}
}
}
return nil
}
// SetAlias implements MeshManager.
func (s *MeshManagerImpl) SetAlias(alias string) error {
meshes := s.GetMeshes()
for _, mesh := range meshes {
if mesh.NodeExists(s.HostParameters.GetPublicKey()) {
err := mesh.SetAlias(s.HostParameters.GetPublicKey(), alias)
if err != nil {
return err
}
}
}
return nil
}
// UpdateTimeStamp updates the timestamp of this node in all meshes
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func (s *MeshManagerImpl) UpdateTimeStamp() error {
meshes := s.GetMeshes()
for _, mesh := range meshes {
if mesh.NodeExists(s.HostParameters.GetPublicKey()) {
err := mesh.UpdateTimeStamp(s.HostParameters.GetPublicKey())
if err != nil {
return err
}
}
}
return nil
}
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func (s *MeshManagerImpl) GetClient() *wgctrl.Client {
return s.Client
}
func (s *MeshManagerImpl) GetMeshes() map[string]MeshProvider {
meshes := make(map[string]MeshProvider)
s.lock.RLock()
for id, mesh := range s.Meshes {
meshes[id] = mesh
}
s.lock.RUnlock()
return meshes
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}
// Close the mesh manager
func (s *MeshManagerImpl) Close() error {
if s.conf.StubWg {
return nil
}
for _, mesh := range s.Meshes {
dev, err := mesh.GetDevice()
if err != nil {
return err
}
err = s.interfaceManipulator.RemoveInterface(dev.Name)
if err != nil {
return err
}
}
return nil
}
// NewMeshManagerParams params required to create an instance of a mesh manager
type NewMeshManagerParams struct {
Conf conf.WgMeshConfiguration
Client *wgctrl.Client
MeshProvider MeshProviderFactory
NodeFactory MeshNodeFactory
IdGenerator lib.IdGenerator
IPAllocator ip.IPAllocator
InterfaceManipulator wg.WgInterfaceManipulator
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ConfigApplyer MeshConfigApplyer
RouteManager RouteManager
OnDelete func(MeshProvider)
}
// Creates a new instance of a mesh manager with the given parameters
func NewMeshManager(params *NewMeshManagerParams) MeshManager {
privateKey, _ := wgtypes.GeneratePrivateKey()
hostParams := HostParameters{
PrivateKey: &privateKey,
}
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m := &MeshManagerImpl{
Meshes: make(map[string]MeshProvider),
HostParameters: &hostParams,
meshProviderFactory: params.MeshProvider,
nodeFactory: params.NodeFactory,
Client: params.Client,
conf: &params.Conf,
}
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m.configApplyer = params.ConfigApplyer
m.RouteManager = params.RouteManager
if m.RouteManager == nil {
m.RouteManager = NewRouteManager(m)
}
m.idGenerator = params.IdGenerator
m.ipAllocator = params.IPAllocator
m.interfaceManipulator = params.InterfaceManipulator
m.Monitor = NewMeshMonitor(m)
aliasManager := NewAliasManager()
m.Monitor.AddUpdateCallback(aliasManager.AddAliases)
m.Monitor.AddRemoveCallback(aliasManager.RemoveAliases)
m.OnDelete = params.OnDelete
return m
}