815 lines
24 KiB
Go
815 lines
24 KiB
Go
// Copyright 2019 the Kilo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build linux
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// +build linux
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package mesh
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"sync"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/vishvananda/netlink"
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"github.com/squat/kilo/pkg/encapsulation"
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"github.com/squat/kilo/pkg/iproute"
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"github.com/squat/kilo/pkg/iptables"
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"github.com/squat/kilo/pkg/route"
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"github.com/squat/kilo/pkg/wireguard"
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)
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const (
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// kiloPath is the directory where Kilo stores its configuration.
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kiloPath = "/var/lib/kilo"
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// privateKeyPath is the filepath where the WireGuard private key is stored.
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privateKeyPath = kiloPath + "/key"
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// confPath is the filepath where the WireGuard configuration is stored.
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confPath = kiloPath + "/conf"
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)
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// Mesh is able to create Kilo network meshes.
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type Mesh struct {
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Backend
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cleanUpIface bool
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cni bool
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cniPath string
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enc encapsulation.Encapsulator
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externalIP *net.IPNet
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granularity Granularity
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hostname string
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internalIP *net.IPNet
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ipTables *iptables.Controller
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kiloIface int
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key []byte
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local bool
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port uint32
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priv []byte
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privIface int
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pub []byte
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resyncPeriod time.Duration
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iptablesForwardRule bool
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stop chan struct{}
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subnet *net.IPNet
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table *route.Table
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wireGuardIP *net.IPNet
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// nodes and peers are mutable fields in the struct
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// and need to be guarded.
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nodes map[string]*Node
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peers map[string]*Peer
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mu sync.Mutex
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errorCounter *prometheus.CounterVec
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leaderGuage prometheus.Gauge
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nodesGuage prometheus.Gauge
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peersGuage prometheus.Gauge
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reconcileCounter prometheus.Counter
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logger log.Logger
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}
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// New returns a new Mesh instance.
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func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularity, hostname string, port uint32, subnet *net.IPNet, local, cni bool, cniPath, iface string, cleanUpIface bool, createIface bool, mtu uint, resyncPeriod time.Duration, prioritisePrivateAddr, iptablesForwardRule bool, logger log.Logger) (*Mesh, error) {
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if err := os.MkdirAll(kiloPath, 0700); err != nil {
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return nil, fmt.Errorf("failed to create directory to store configuration: %v", err)
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}
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private, err := ioutil.ReadFile(privateKeyPath)
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private = bytes.Trim(private, "\n")
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if err != nil {
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level.Warn(logger).Log("msg", "no private key found on disk; generating one now")
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if private, err = wireguard.GenKey(); err != nil {
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return nil, err
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}
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}
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public, err := wireguard.PubKey(private)
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if err != nil {
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return nil, err
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}
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if err := ioutil.WriteFile(privateKeyPath, private, 0600); err != nil {
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return nil, fmt.Errorf("failed to write private key to disk: %v", err)
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}
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cniIndex, err := cniDeviceIndex()
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if err != nil {
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return nil, fmt.Errorf("failed to query netlink for CNI device: %v", err)
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}
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var kiloIface int
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if createIface {
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kiloIface, _, err = wireguard.New(iface, mtu)
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if err != nil {
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return nil, fmt.Errorf("failed to create WireGuard interface: %v", err)
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}
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} else {
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link, err := netlink.LinkByName(iface)
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if err != nil {
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return nil, fmt.Errorf("failed to get interface index: %v", err)
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}
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kiloIface = link.Attrs().Index
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}
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privateIP, publicIP, err := getIP(hostname, kiloIface, enc.Index(), cniIndex)
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if err != nil {
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return nil, fmt.Errorf("failed to find public IP: %v", err)
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}
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var privIface int
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if privateIP != nil {
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ifaces, err := interfacesForIP(privateIP)
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if err != nil {
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return nil, fmt.Errorf("failed to find interface for private IP: %v", err)
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}
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privIface = ifaces[0].Index
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if enc.Strategy() != encapsulation.Never {
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if err := enc.Init(privIface); err != nil {
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return nil, fmt.Errorf("failed to initialize encapsulator: %v", err)
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}
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}
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level.Debug(logger).Log("msg", fmt.Sprintf("using %s as the private IP address", privateIP.String()))
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} else {
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enc = encapsulation.Noop(enc.Strategy())
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level.Debug(logger).Log("msg", "running without a private IP address")
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}
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var externalIP *net.IPNet
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if prioritisePrivateAddr && privateIP != nil {
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externalIP = privateIP
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} else {
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externalIP = publicIP
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}
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level.Debug(logger).Log("msg", fmt.Sprintf("using %s as the public IP address", publicIP.String()))
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ipTables, err := iptables.New(iptables.WithLogger(log.With(logger, "component", "iptables")), iptables.WithResyncPeriod(resyncPeriod))
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if err != nil {
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return nil, fmt.Errorf("failed to IP tables controller: %v", err)
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}
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return &Mesh{
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Backend: backend,
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cleanUpIface: cleanUpIface,
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cni: cni,
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cniPath: cniPath,
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enc: enc,
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externalIP: externalIP,
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granularity: granularity,
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hostname: hostname,
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internalIP: privateIP,
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ipTables: ipTables,
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kiloIface: kiloIface,
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nodes: make(map[string]*Node),
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peers: make(map[string]*Peer),
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port: port,
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priv: private,
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privIface: privIface,
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pub: public,
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resyncPeriod: resyncPeriod,
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iptablesForwardRule: iptablesForwardRule,
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local: local,
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stop: make(chan struct{}),
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subnet: subnet,
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table: route.NewTable(),
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errorCounter: prometheus.NewCounterVec(prometheus.CounterOpts{
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Name: "kilo_errors_total",
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Help: "Number of errors that occurred while administering the mesh.",
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}, []string{"event"}),
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leaderGuage: prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "kilo_leader",
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Help: "Leadership status of the node.",
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}),
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nodesGuage: prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "kilo_nodes",
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Help: "Number of nodes in the mesh.",
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}),
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peersGuage: prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "kilo_peers",
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Help: "Number of peers in the mesh.",
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}),
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reconcileCounter: prometheus.NewCounter(prometheus.CounterOpts{
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Name: "kilo_reconciles_total",
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Help: "Number of reconciliation attempts.",
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}),
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logger: logger,
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}, nil
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}
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// Run starts the mesh.
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func (m *Mesh) Run() error {
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if err := m.Nodes().Init(m.stop); err != nil {
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return fmt.Errorf("failed to initialize node backend: %v", err)
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}
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// Try to set the CNI config quickly.
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if m.cni {
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if n, err := m.Nodes().Get(m.hostname); err == nil {
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m.nodes[m.hostname] = n
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m.updateCNIConfig()
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} else {
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level.Warn(m.logger).Log("error", fmt.Errorf("failed to get node %q: %v", m.hostname, err))
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}
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}
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if err := m.Peers().Init(m.stop); err != nil {
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return fmt.Errorf("failed to initialize peer backend: %v", err)
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}
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ipTablesErrors, err := m.ipTables.Run(m.stop)
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if err != nil {
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return fmt.Errorf("failed to watch for IP tables updates: %v", err)
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}
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routeErrors, err := m.table.Run(m.stop)
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if err != nil {
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return fmt.Errorf("failed to watch for route table updates: %v", err)
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}
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go func() {
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for {
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var err error
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select {
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case err = <-ipTablesErrors:
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case err = <-routeErrors:
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case <-m.stop:
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return
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}
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if err != nil {
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level.Error(m.logger).Log("error", err)
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m.errorCounter.WithLabelValues("run").Inc()
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}
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}
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}()
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defer m.cleanUp()
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resync := time.NewTimer(m.resyncPeriod)
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checkIn := time.NewTimer(checkInPeriod)
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nw := m.Nodes().Watch()
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pw := m.Peers().Watch()
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var ne *NodeEvent
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var pe *PeerEvent
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for {
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select {
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case ne = <-nw:
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m.syncNodes(ne)
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case pe = <-pw:
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m.syncPeers(pe)
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case <-checkIn.C:
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m.checkIn()
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checkIn.Reset(checkInPeriod)
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case <-resync.C:
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if m.cni {
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m.updateCNIConfig()
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}
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m.applyTopology()
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resync.Reset(m.resyncPeriod)
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case <-m.stop:
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return nil
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}
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}
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}
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func (m *Mesh) syncNodes(e *NodeEvent) {
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logger := log.With(m.logger, "event", e.Type)
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level.Debug(logger).Log("msg", "syncing nodes", "event", e.Type)
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if isSelf(m.hostname, e.Node) {
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level.Debug(logger).Log("msg", "processing local node", "node", e.Node)
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m.handleLocal(e.Node)
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return
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}
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var diff bool
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m.mu.Lock()
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if !e.Node.Ready() {
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// Trace non ready nodes with their presence in the mesh.
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_, ok := m.nodes[e.Node.Name]
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level.Debug(logger).Log("msg", "received non ready node", "node", e.Node, "in-mesh", ok)
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}
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switch e.Type {
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case AddEvent:
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fallthrough
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case UpdateEvent:
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if !nodesAreEqual(m.nodes[e.Node.Name], e.Node) {
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diff = true
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}
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// Even if the nodes are the same,
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// overwrite the old node to update the timestamp.
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m.nodes[e.Node.Name] = e.Node
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case DeleteEvent:
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delete(m.nodes, e.Node.Name)
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diff = true
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}
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m.mu.Unlock()
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if diff {
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level.Info(logger).Log("node", e.Node)
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m.applyTopology()
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}
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}
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func (m *Mesh) syncPeers(e *PeerEvent) {
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logger := log.With(m.logger, "event", e.Type)
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level.Debug(logger).Log("msg", "syncing peers", "event", e.Type)
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var diff bool
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m.mu.Lock()
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// Peers are indexed by public key.
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key := string(e.Peer.PublicKey)
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if !e.Peer.Ready() {
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// Trace non ready peer with their presence in the mesh.
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_, ok := m.peers[key]
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level.Debug(logger).Log("msg", "received non ready peer", "peer", e.Peer, "in-mesh", ok)
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}
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switch e.Type {
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case AddEvent:
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fallthrough
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case UpdateEvent:
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if e.Old != nil && key != string(e.Old.PublicKey) {
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delete(m.peers, string(e.Old.PublicKey))
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diff = true
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}
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if !peersAreEqual(m.peers[key], e.Peer) {
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m.peers[key] = e.Peer
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diff = true
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}
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case DeleteEvent:
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delete(m.peers, key)
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diff = true
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}
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m.mu.Unlock()
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if diff {
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level.Info(logger).Log("peer", e.Peer)
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m.applyTopology()
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}
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}
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// checkIn will try to update the local node's LastSeen timestamp
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// in the backend.
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func (m *Mesh) checkIn() {
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m.mu.Lock()
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defer m.mu.Unlock()
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n := m.nodes[m.hostname]
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if n == nil {
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level.Debug(m.logger).Log("msg", "no local node found in backend")
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return
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}
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oldTime := n.LastSeen
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n.LastSeen = time.Now().Unix()
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if err := m.Nodes().Set(m.hostname, n); err != nil {
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level.Error(m.logger).Log("error", fmt.Sprintf("failed to set local node: %v", err), "node", n)
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m.errorCounter.WithLabelValues("checkin").Inc()
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// Revert time.
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n.LastSeen = oldTime
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return
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}
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level.Debug(m.logger).Log("msg", "successfully checked in local node in backend")
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}
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func (m *Mesh) handleLocal(n *Node) {
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// Allow the IPs to be overridden.
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if n.Endpoint == nil || (n.Endpoint.DNS == "" && n.Endpoint.IP == nil) {
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n.Endpoint = &wireguard.Endpoint{DNSOrIP: wireguard.DNSOrIP{IP: m.externalIP.IP}, Port: m.port}
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}
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if n.InternalIP == nil && !n.NoInternalIP {
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n.InternalIP = m.internalIP
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}
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// Compare the given node to the calculated local node.
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// Take leader, location, and subnet from the argument, as these
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// are not determined by kilo.
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local := &Node{
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Endpoint: n.Endpoint,
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Key: m.pub,
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NoInternalIP: n.NoInternalIP,
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InternalIP: n.InternalIP,
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LastSeen: time.Now().Unix(),
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Leader: n.Leader,
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Location: n.Location,
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Name: m.hostname,
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PersistentKeepalive: n.PersistentKeepalive,
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Subnet: n.Subnet,
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WireGuardIP: m.wireGuardIP,
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DiscoveredEndpoints: n.DiscoveredEndpoints,
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AllowedLocationIPs: n.AllowedLocationIPs,
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Granularity: m.granularity,
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}
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if !nodesAreEqual(n, local) {
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level.Debug(m.logger).Log("msg", "local node differs from backend")
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if err := m.Nodes().Set(m.hostname, local); err != nil {
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level.Error(m.logger).Log("error", fmt.Sprintf("failed to set local node: %v", err), "node", local)
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m.errorCounter.WithLabelValues("local").Inc()
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return
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}
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level.Debug(m.logger).Log("msg", "successfully reconciled local node against backend")
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}
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m.mu.Lock()
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n = m.nodes[m.hostname]
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if n == nil {
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n = &Node{}
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}
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m.mu.Unlock()
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if !nodesAreEqual(n, local) {
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m.mu.Lock()
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m.nodes[local.Name] = local
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m.mu.Unlock()
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m.applyTopology()
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}
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}
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func (m *Mesh) applyTopology() {
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m.reconcileCounter.Inc()
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m.mu.Lock()
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defer m.mu.Unlock()
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// If we can't resolve an endpoint, then fail and retry later.
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if err := m.resolveEndpoints(); err != nil {
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level.Error(m.logger).Log("error", err)
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m.errorCounter.WithLabelValues("apply").Inc()
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return
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}
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// Ensure only ready nodes are considered.
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nodes := make(map[string]*Node)
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var readyNodes float64
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for k := range m.nodes {
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m.nodes[k].Granularity = m.granularity
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if !m.nodes[k].Ready() {
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continue
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}
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// Make it point to the node without copy.
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nodes[k] = m.nodes[k]
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readyNodes++
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}
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// Ensure only ready nodes are considered.
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peers := make(map[string]*Peer)
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var readyPeers float64
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for k := range m.peers {
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if !m.peers[k].Ready() {
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continue
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}
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// Make it point the peer without copy.
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peers[k] = m.peers[k]
|
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readyPeers++
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}
|
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m.nodesGuage.Set(readyNodes)
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m.peersGuage.Set(readyPeers)
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// We cannot do anything with the topology until the local node is available.
|
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if nodes[m.hostname] == nil {
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return
|
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}
|
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// Find the Kilo interface name.
|
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link, err := linkByIndex(m.kiloIface)
|
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if err != nil {
|
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level.Error(m.logger).Log("error", err)
|
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m.errorCounter.WithLabelValues("apply").Inc()
|
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return
|
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}
|
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// Find the old configuration.
|
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oldConfDump, err := wireguard.ShowDump(link.Attrs().Name)
|
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if err != nil {
|
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level.Error(m.logger).Log("error", err)
|
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m.errorCounter.WithLabelValues("apply").Inc()
|
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return
|
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}
|
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oldConf, err := wireguard.ParseDump(oldConfDump)
|
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if err != nil {
|
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level.Error(m.logger).Log("error", err)
|
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m.errorCounter.WithLabelValues("apply").Inc()
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return
|
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}
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natEndpoints := discoverNATEndpoints(nodes, peers, oldConf, m.logger)
|
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nodes[m.hostname].DiscoveredEndpoints = natEndpoints
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t, err := NewTopology(nodes, peers, m.granularity, m.hostname, nodes[m.hostname].Endpoint.Port, m.priv, m.subnet, nodes[m.hostname].PersistentKeepalive, m.logger)
|
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if err != nil {
|
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level.Error(m.logger).Log("error", err)
|
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m.errorCounter.WithLabelValues("apply").Inc()
|
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return
|
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}
|
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// Update the node's WireGuard IP.
|
|
if t.leader {
|
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m.wireGuardIP = t.wireGuardCIDR
|
|
} else {
|
|
m.wireGuardIP = nil
|
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}
|
|
conf := t.Conf()
|
|
buf, err := conf.Bytes()
|
|
if err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
if err := ioutil.WriteFile(confPath, buf, 0600); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
ipRules := t.Rules(m.cni, m.iptablesForwardRule)
|
|
// If we are handling local routes, ensure the local
|
|
// tunnel has an IP address and IPIP traffic is allowed.
|
|
if m.enc.Strategy() != encapsulation.Never && m.local {
|
|
var cidrs []*net.IPNet
|
|
for _, s := range t.segments {
|
|
// If the location prefix is not logicalLocation, but nodeLocation,
|
|
// we don't need to set any extra rules for encapsulation anyways
|
|
// because traffic will go over WireGuard.
|
|
if s.location == logicalLocationPrefix+nodes[m.hostname].Location {
|
|
for i := range s.privateIPs {
|
|
cidrs = append(cidrs, oneAddressCIDR(s.privateIPs[i]))
|
|
}
|
|
break
|
|
}
|
|
}
|
|
ipRules = append(ipRules, m.enc.Rules(cidrs)...)
|
|
// If we are handling local routes, ensure the local
|
|
// tunnel has an IP address.
|
|
if err := m.enc.Set(oneAddressCIDR(newAllocator(*nodes[m.hostname].Subnet).next().IP)); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
}
|
|
if err := m.ipTables.Set(ipRules); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
if t.leader {
|
|
m.leaderGuage.Set(1)
|
|
if err := iproute.SetAddress(m.kiloIface, t.wireGuardCIDR); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
// Setting the WireGuard configuration interrupts existing connections
|
|
// so only set the configuration if it has changed.
|
|
equal := conf.Equal(oldConf)
|
|
if !equal {
|
|
level.Info(m.logger).Log("msg", "WireGuard configurations are different")
|
|
if err := wireguard.SetConf(link.Attrs().Name, confPath); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
}
|
|
if err := iproute.Set(m.kiloIface, true); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
} else {
|
|
m.leaderGuage.Set(0)
|
|
level.Debug(m.logger).Log("msg", "local node is not the leader")
|
|
if err := iproute.Set(m.kiloIface, false); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
return
|
|
}
|
|
}
|
|
// We need to add routes last since they may depend
|
|
// on the WireGuard interface.
|
|
routes, rules := t.Routes(link.Attrs().Name, m.kiloIface, m.privIface, m.enc.Index(), m.local, m.enc)
|
|
if err := m.table.Set(routes, rules); err != nil {
|
|
level.Error(m.logger).Log("error", err)
|
|
m.errorCounter.WithLabelValues("apply").Inc()
|
|
}
|
|
}
|
|
|
|
// RegisterMetrics registers Prometheus metrics on the given Prometheus
|
|
// registerer.
|
|
func (m *Mesh) RegisterMetrics(r prometheus.Registerer) {
|
|
r.MustRegister(
|
|
m.errorCounter,
|
|
m.leaderGuage,
|
|
m.nodesGuage,
|
|
m.peersGuage,
|
|
m.reconcileCounter,
|
|
)
|
|
}
|
|
|
|
// Stop stops the mesh.
|
|
func (m *Mesh) Stop() {
|
|
close(m.stop)
|
|
}
|
|
|
|
func (m *Mesh) cleanUp() {
|
|
if err := m.ipTables.CleanUp(); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to clean up IP tables: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
if err := m.table.CleanUp(); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to clean up routes: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
if err := os.Remove(confPath); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to delete configuration file: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
if m.cleanUpIface {
|
|
if err := iproute.RemoveInterface(m.kiloIface); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to remove WireGuard interface: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
}
|
|
if err := m.Nodes().CleanUp(m.hostname); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to clean up node backend: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
if err := m.Peers().CleanUp(m.hostname); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to clean up peer backend: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
if err := m.enc.CleanUp(); err != nil {
|
|
level.Error(m.logger).Log("error", fmt.Sprintf("failed to clean up encapsulator: %v", err))
|
|
m.errorCounter.WithLabelValues("cleanUp").Inc()
|
|
}
|
|
}
|
|
|
|
func (m *Mesh) resolveEndpoints() error {
|
|
for k := range m.nodes {
|
|
// Skip unready nodes, since they will not be used
|
|
// in the topology anyways.
|
|
if !m.nodes[k].Ready() {
|
|
continue
|
|
}
|
|
// If the node is ready, then the endpoint is not nil
|
|
// but it may not have a DNS name.
|
|
if m.nodes[k].Endpoint.DNS == "" {
|
|
continue
|
|
}
|
|
if err := resolveEndpoint(m.nodes[k].Endpoint); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
for k := range m.peers {
|
|
// Skip unready peers, since they will not be used
|
|
// in the topology anyways.
|
|
if !m.peers[k].Ready() {
|
|
continue
|
|
}
|
|
// Peers may have nil endpoints.
|
|
if m.peers[k].Endpoint == nil || m.peers[k].Endpoint.DNS == "" {
|
|
continue
|
|
}
|
|
if err := resolveEndpoint(m.peers[k].Endpoint); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func resolveEndpoint(endpoint *wireguard.Endpoint) error {
|
|
ips, err := net.LookupIP(endpoint.DNS)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to look up DNS name %q: %v", endpoint.DNS, err)
|
|
}
|
|
nets := make([]*net.IPNet, len(ips), len(ips))
|
|
for i := range ips {
|
|
nets[i] = oneAddressCIDR(ips[i])
|
|
}
|
|
sortIPs(nets)
|
|
if len(nets) == 0 {
|
|
return fmt.Errorf("did not find any addresses for DNS name %q", endpoint.DNS)
|
|
}
|
|
endpoint.IP = nets[0].IP
|
|
return nil
|
|
}
|
|
|
|
func isSelf(hostname string, node *Node) bool {
|
|
return node != nil && node.Name == hostname
|
|
}
|
|
|
|
func nodesAreEqual(a, b *Node) bool {
|
|
if (a != nil) != (b != nil) {
|
|
return false
|
|
}
|
|
if a == b {
|
|
return true
|
|
}
|
|
// Check the DNS name first since this package
|
|
// is doing the DNS resolution.
|
|
if !a.Endpoint.Equal(b.Endpoint, true) {
|
|
return false
|
|
}
|
|
// Ignore LastSeen when comparing equality we want to check if the nodes are
|
|
// equivalent. However, we do want to check if LastSeen has transitioned
|
|
// between valid and invalid.
|
|
return string(a.Key) == string(b.Key) && ipNetsEqual(a.WireGuardIP, b.WireGuardIP) && ipNetsEqual(a.InternalIP, b.InternalIP) && a.Leader == b.Leader && a.Location == b.Location && a.Name == b.Name && subnetsEqual(a.Subnet, b.Subnet) && a.Ready() == b.Ready() && a.PersistentKeepalive == b.PersistentKeepalive && discoveredEndpointsAreEqual(a.DiscoveredEndpoints, b.DiscoveredEndpoints) && ipNetSlicesEqual(a.AllowedLocationIPs, b.AllowedLocationIPs) && a.Granularity == b.Granularity
|
|
}
|
|
|
|
func peersAreEqual(a, b *Peer) bool {
|
|
if !(a != nil) == (b != nil) {
|
|
return false
|
|
}
|
|
if a == b {
|
|
return true
|
|
}
|
|
// Check the DNS name first since this package
|
|
// is doing the DNS resolution.
|
|
if !a.Endpoint.Equal(b.Endpoint, true) {
|
|
return false
|
|
}
|
|
if len(a.AllowedIPs) != len(b.AllowedIPs) {
|
|
return false
|
|
}
|
|
for i := range a.AllowedIPs {
|
|
if !ipNetsEqual(a.AllowedIPs[i], b.AllowedIPs[i]) {
|
|
return false
|
|
}
|
|
}
|
|
return string(a.PublicKey) == string(b.PublicKey) && string(a.PresharedKey) == string(b.PresharedKey) && a.PersistentKeepalive == b.PersistentKeepalive
|
|
}
|
|
|
|
func ipNetsEqual(a, b *net.IPNet) bool {
|
|
if a == nil && b == nil {
|
|
return true
|
|
}
|
|
if (a != nil) != (b != nil) {
|
|
return false
|
|
}
|
|
if a.Mask.String() != b.Mask.String() {
|
|
return false
|
|
}
|
|
return a.IP.Equal(b.IP)
|
|
}
|
|
|
|
func ipNetSlicesEqual(a, b []*net.IPNet) bool {
|
|
if len(a) != len(b) {
|
|
return false
|
|
}
|
|
for i := range a {
|
|
if !ipNetsEqual(a[i], b[i]) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func subnetsEqual(a, b *net.IPNet) bool {
|
|
if a == nil && b == nil {
|
|
return true
|
|
}
|
|
if (a != nil) != (b != nil) {
|
|
return false
|
|
}
|
|
if a.Mask.String() != b.Mask.String() {
|
|
return false
|
|
}
|
|
if !a.Contains(b.IP) {
|
|
return false
|
|
}
|
|
if !b.Contains(a.IP) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
func discoveredEndpointsAreEqual(a, b map[string]*wireguard.Endpoint) bool {
|
|
if a == nil && b == nil {
|
|
return true
|
|
}
|
|
if (a != nil) != (b != nil) {
|
|
return false
|
|
}
|
|
if len(a) != len(b) {
|
|
return false
|
|
}
|
|
for k := range a {
|
|
if !a[k].Equal(b[k], false) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func linkByIndex(index int) (netlink.Link, error) {
|
|
link, err := netlink.LinkByIndex(index)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to get interface: %v", err)
|
|
}
|
|
return link, nil
|
|
}
|
|
|
|
// discoverNATEndpoints uses the node's WireGuard configuration to returns a list of the most recently discovered endpoints for all nodes and peers behind NAT so that they can roam.
|
|
func discoverNATEndpoints(nodes map[string]*Node, peers map[string]*Peer, conf *wireguard.Conf, logger log.Logger) map[string]*wireguard.Endpoint {
|
|
natEndpoints := make(map[string]*wireguard.Endpoint)
|
|
keys := make(map[string]*wireguard.Peer)
|
|
for i := range conf.Peers {
|
|
keys[string(conf.Peers[i].PublicKey)] = conf.Peers[i]
|
|
}
|
|
for _, n := range nodes {
|
|
if peer, ok := keys[string(n.Key)]; ok && n.PersistentKeepalive > 0 {
|
|
level.Debug(logger).Log("msg", "WireGuard Update NAT Endpoint", "node", n.Name, "endpoint", peer.Endpoint, "former-endpoint", n.Endpoint, "same", n.Endpoint.Equal(peer.Endpoint, false), "latest-handshake", peer.LatestHandshake)
|
|
if (peer.LatestHandshake != time.Time{}) {
|
|
natEndpoints[string(n.Key)] = peer.Endpoint
|
|
}
|
|
}
|
|
}
|
|
for _, p := range peers {
|
|
if peer, ok := keys[string(p.PublicKey)]; ok && p.PersistentKeepalive > 0 {
|
|
if (peer.LatestHandshake != time.Time{}) {
|
|
natEndpoints[string(p.PublicKey)] = peer.Endpoint
|
|
}
|
|
}
|
|
}
|
|
level.Debug(logger).Log("msg", "Discovered WireGuard NAT Endpoints", "DiscoveredEndpoints", natEndpoints)
|
|
return natEndpoints
|
|
}
|