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

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package mesh
import (
"errors"
"fmt"
"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(devName string, port int) (string, error)
AddMesh(params *AddMeshParams) error
HasChanges(meshid string) bool
GetMesh(meshId string) MeshProvider
EnableInterface(meshId string) error
GetPublicKey(meshId string) (*wgtypes.Key, error)
AddSelf(params *AddSelfParams) error
LeaveMesh(meshId string) error
GetSelf(meshId string) (MeshNode, error)
ApplyConfig() error
SetDescription(description string) error
SetAlias(alias string) error
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UpdateTimeStamp() error
GetClient() *wgctrl.Client
GetMeshes() map[string]MeshProvider
Prune() error
Close() error
GetMonitor() MeshMonitor
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}
type MeshManagerImpl struct {
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
}
// 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
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func (m *MeshManagerImpl) CreateMesh(devName string, port int) (string, error) {
meshId, err := m.idGenerator.GetId()
if err != nil {
return "", err
}
nodeManager, err := m.meshProviderFactory.CreateMesh(&MeshProviderFactoryParams{
DevName: devName,
Port: port,
Conf: m.conf,
Client: m.Client,
MeshId: meshId,
})
if err != nil {
return "", fmt.Errorf("error creating mesh: %w", err)
}
err = m.interfaceManipulator.CreateInterface(&wg.CreateInterfaceParams{
IfName: devName,
Port: port,
})
if err != nil {
return "", fmt.Errorf("error creating mesh: %w", err)
}
m.Meshes[meshId] = nodeManager
return meshId, nil
}
type AddMeshParams struct {
MeshId string
DevName 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 {
meshProvider, err := m.meshProviderFactory.CreateMesh(&MeshProviderFactoryParams{
DevName: params.DevName,
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.Meshes[params.MeshId] = meshProvider
return m.interfaceManipulator.CreateInterface(&wg.CreateInterfaceParams{
IfName: params.DevName,
Port: params.WgPort,
})
}
// 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
}
// EnableInterface: Enables the given WireGuard interface.
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func (s *MeshManagerImpl) EnableInterface(meshId string) error {
err := s.configApplyer.ApplyConfig()
if err != nil {
return err
}
err = s.RouteManager.InstallRoutes()
if err != nil {
return err
}
return nil
}
// GetPublicKey: Gets the public key of the WireGuard mesh
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func (s *MeshManagerImpl) GetPublicKey(meshId string) (*wgtypes.Key, error) {
mesh, ok := s.Meshes[meshId]
if !ok {
return nil, errors.New("mesh does not exist")
}
dev, err := mesh.GetDevice()
if err != nil {
return nil, err
}
return &dev.PublicKey, nil
}
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
// to
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)
}
pubKey, err := s.GetPublicKey(params.MeshId)
if err != nil {
return err
}
nodeIP, err := s.ipAllocator.GetIP(*pubKey, params.MeshId)
if err != nil {
return err
}
node := s.nodeFactory.Build(&MeshNodeFactoryParams{
PublicKey: pubKey,
NodeIP: nodeIP,
WgPort: params.WgPort,
Endpoint: params.Endpoint,
})
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, exists := s.Meshes[meshId]
if !exists {
return fmt.Errorf("mesh %s does not exist", meshId)
}
err := s.RouteManager.RemoveRoutes(meshId)
if err != nil {
return err
}
device, err := mesh.GetDevice()
if err != nil {
return err
}
err = s.interfaceManipulator.RemoveInterface(device.Name)
delete(s.Meshes, meshId)
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)
}
snapshot, err := meshInstance.GetMesh()
if err != nil {
return nil, err
}
node, ok := snapshot.GetNodes()[s.HostParameters.HostEndpoint]
if !ok {
return nil, errors.New("the node doesn't exist in the mesh")
}
return node, nil
}
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func (s *MeshManagerImpl) ApplyConfig() error {
err := s.configApplyer.ApplyConfig()
if err != nil {
return err
}
return s.RouteManager.InstallRoutes()
}
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func (s *MeshManagerImpl) SetDescription(description string) error {
for _, mesh := range s.Meshes {
err := mesh.SetDescription(s.HostParameters.HostEndpoint, description)
if err != nil {
return err
}
}
return nil
}
// SetAlias implements MeshManager.
func (s *MeshManagerImpl) SetAlias(alias string) error {
for _, mesh := range s.Meshes {
err := mesh.SetAlias(s.HostParameters.HostEndpoint, 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 {
for _, mesh := range s.Meshes {
snapshot, err := mesh.GetMesh()
if err != nil {
return err
}
_, exists := snapshot.GetNodes()[s.HostParameters.HostEndpoint]
if exists {
err = mesh.UpdateTimeStamp(s.HostParameters.HostEndpoint)
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 {
return s.Meshes
}
func (s *MeshManagerImpl) Close() error {
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
}
// Creates a new instance of a mesh manager with the given parameters
func NewMeshManager(params *NewMeshManagerParams) MeshManager {
hostParams := HostParameters{}
switch params.Conf.Endpoint {
case "":
hostParams.HostEndpoint = fmt.Sprintf("%s:%s", lib.GetOutboundIP().String(), params.Conf.GrpcPort)
default:
hostParams.HostEndpoint = fmt.Sprintf("%s:%s", params.Conf.Endpoint, params.Conf.GrpcPort)
}
logging.Log.WriteInfof("Endpoint %s", hostParams.HostEndpoint)
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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.Monitor.AddCallback(AddAliases)
return m
}