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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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CC=go
BUILD=build -v -trimpath
VERSION=$(shell cat VERSION)
GCFLAGS=-gcflags '-e'
LDFLAGS=-ldflags '-X main.version=$(VERSION) -s -w'
PROGRAM=vipman
CMD=-o vipman cmd/vipman/main.go
ENV=CGO_ENABLED=0 GO111MODULE=on
all: $(PROGRAM)
setup:
$(CC) get -u github.com/client9/misspell
release: clean generate gofmt codeqa
$(ENV) $(CC) $(BUILD) $(GCFLAGS) $(LDFLAGS) $(CMD)
release-vendor: clean generate gofmt codeqa
$(ENV) $(CC) $(BUILD) -mod=vendor $(GCFLAGS) $(LDFLAGS) $(CMD)
vendor: clean generate gofmt
$(ENV) $(CC) $(BUILD) -mod=vendor $(GCFLAGS) $(LDFLAGS) $(CMD)
$(PROGRAM): clean generate gofmt
$(ENV) $(CC) $(BUILD) $(GCFLAGS) $(LDFLAGS) $(CMD)
clean:
$(CC) clean -x
codeqa: misspell golint test
generate:
$(CC) generate
gofmt:
gofmt -w pkg/ cmd/
golint:
$(GOPATH)/bin/golint .
misspell:
$(GOPATH)/bin/misspell pkg/* cmd/* Makefile README.md
test:
ifeq ($(shell go env GOARCH), $(shell go env GOHOSTARCH))
ifeq ($(shell go env GOOS), $(shell go env GOHOSTOS))
$(CC) test ./...
else
$(info skipping tests of other platforms)
endif
else
$(info skipping tests of other platforms)
endif
.PHONY: setup release release-vendor vendor build clean codeqa generate gofmt golint misspell test

11
go.mod Normal file
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@ -0,0 +1,11 @@
module git.giftfish.de/ston1th/vipman
go 1.15
require (
github.com/go-logr/logr v0.3.0
github.com/hashicorp/raft v1.2.0
github.com/hashicorp/raft-boltdb v0.0.0-20191021154308-4207f1bf0617
gopkg.in/yaml.v2 v2.3.0
k8s.io/klog v1.0.0
)

52
go.sum Normal file
View file

@ -0,0 +1,52 @@
github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM=
github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
github.com/go-logr/logr v0.3.0 h1:q4c+kbcR0d5rSurhBR8dIgieOaYpXtsdTYfx22Cu6rs=
github.com/go-logr/logr v0.3.0/go.mod h1:z6/tIYblkpsD+a4lm/fGIIU9mZ+XfAiaFtq7xTgseGU=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/hashicorp/go-cleanhttp v0.5.0/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
github.com/hashicorp/go-hclog v0.9.1 h1:9PZfAcVEvez4yhLH2TBU64/h/z4xlFI80cWXRrxuKuM=
github.com/hashicorp/go-hclog v0.9.1/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
github.com/hashicorp/go-immutable-radix v1.0.0 h1:AKDB1HM5PWEA7i4nhcpwOrO2byshxBjXVn/J/3+z5/0=
github.com/hashicorp/go-immutable-radix v1.0.0/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=
github.com/hashicorp/go-msgpack v0.5.5 h1:i9R9JSrqIz0QVLz3sz+i3YJdT7TTSLcfLLzJi9aZTuI=
github.com/hashicorp/go-msgpack v0.5.5/go.mod h1:ahLV/dePpqEmjfWmKiqvPkv/twdG7iPBM1vqhUKIvfM=
github.com/hashicorp/go-retryablehttp v0.5.3/go.mod h1:9B5zBasrRhHXnJnui7y6sL7es7NDiJgTc6Er0maI1Xs=
github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
github.com/hashicorp/golang-lru v0.5.0 h1:CL2msUPvZTLb5O648aiLNJw3hnBxN2+1Jq8rCOH9wdo=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/raft v1.1.0/go.mod h1:4Ak7FSPnuvmb0GV6vgIAJ4vYT4bek9bb6Q+7HVbyzqM=
github.com/hashicorp/raft v1.2.0 h1:mHzHIrF0S91d3A7RPBvuqkgB4d/7oFJZyvf1Q4m7GA0=
github.com/hashicorp/raft v1.2.0/go.mod h1:vPAJM8Asw6u8LxC3eJCUZmRP/E4QmUGE1R7g7k8sG/8=
github.com/hashicorp/raft-boltdb v0.0.0-20171010151810-6e5ba93211ea/go.mod h1:pNv7Wc3ycL6F5oOWn+tPGo2gWD4a5X+yp/ntwdKLjRk=
github.com/hashicorp/raft-boltdb v0.0.0-20191021154308-4207f1bf0617 h1:CJDRE/2tBNFOrcoexD2nvTRbQEox3FDxl4NxIezp1b8=
github.com/hashicorp/raft-boltdb v0.0.0-20191021154308-4207f1bf0617/go.mod h1:aUF6HQr8+t3FC/ZHAC+pZreUBhTaxumuu3L+d37uRxk=
github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v0.9.2/go.mod h1:OsXs2jCmiKlQ1lTBmv21f2mNfw4xf/QclQDMrYNZzcM=
github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
github.com/prometheus/common v0.0.0-20181126121408-4724e9255275/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190523142557-0e01d883c5c5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
k8s.io/klog v1.0.0 h1:Pt+yjF5aB1xDSVbau4VsWe+dQNzA0qv1LlXdC2dF6Q8=
k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=

45
pkg/cluster/cluster.go Normal file
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@ -0,0 +1,45 @@
package cluster
import (
"context"
"errors"
)
// Cluster - The Cluster object manages the state of the cluster for a particular node
type Cluster struct {
stateMachine FSM
stop chan struct{}
done chan struct{}
Callbacks LeaderCallbacks
}
type LeaderCallbacks struct {
// OnStartedLeading is called when a LeaderElector client starts leading
OnStartedLeading func(context.Context)
// OnStoppedLeading is called when a LeaderElector client stops leading
OnStoppedLeading func()
// OnNewLeader is called when the client observes a leader that is
// not the previously observed leader. This includes the first observed
// leader when the client starts.
OnNewLeader func(string)
}
// InitCluster - Will attempt to initialise all of the required settings for the cluster
func InitCluster(callbacks LeaderCallbacks) (*Cluster, error) {
if callbacks.OnStartedLeading == nil {
return nil, errors.New("OnStartedLeading is nil")
}
if callbacks.OnStoppedLeading == nil {
return nil, errors.New("OnStoppedLeading is nil")
}
if callbacks.OnNewLeader == nil {
return nil, errors.New("OnNewLeader is nil")
}
c := &Cluster{
stop: make(chan struct{}, 1),
done: make(chan struct{}, 1),
Callbacks: callbacks,
}
return c, nil
}

200
pkg/cluster/raft.go Normal file
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@ -0,0 +1,200 @@
package cluster
import (
"context"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"runtime"
"time"
"git.giftfish.de/ston1th/vipman/pkg/config"
"github.com/go-logr/logr"
"github.com/hashicorp/raft"
raftboltdb "github.com/hashicorp/raft-boltdb"
"k8s.io/klog"
)
type raftLog string
func (r *raftLog) Write(p []byte) (n int, err error) {
return os.Stdout.Write(append([]byte(*r), p...))
}
var _ = ioutil.Discard
// StartRaftCluster - Begins a running instance of the Raft cluster
func (c *Cluster) StartRaftCluster(log logr.Logger, cfg *config.Config) error {
// Create local configuration address
localAddress := fmt.Sprintf("%s:%d", cfg.LocalPeer.Address, cfg.LocalPeer.Port)
// Begin the Raft configuration
rc := raft.DefaultConfig()
rc.LocalID = raft.ServerID(cfg.LocalPeer.ID)
rl := raftLog(cfg.LocalPeer.ID + " ")
rc.LogOutput = &rl
//rc.LogOutput = ioutil.Discard
// Initialize communication
address, err := net.ResolveTCPAddr("tcp", localAddress)
if err != nil {
return err
}
// Create transport
transport, err := raft.NewTCPTransport(localAddress, address, 3, 10*time.Second, os.Stdout)
if err != nil {
return err
}
// Create Raft structures
snapshots := raft.NewInmemSnapshotStore()
//logStore := raft.NewInmemStore()
bootstrap := true
if _, err := os.Stat(cfg.DBFile); err == nil {
bootstrap = false
}
stableStore, err := raftboltdb.NewBoltStore(cfg.DBFile)
if err != nil {
return err
}
logStore, err := raftboltdb.NewBoltStore(cfg.DBFile + ".log")
if err != nil {
return err
}
// Cluster configuration
configuration := raft.Configuration{}
// Add Local Peer
configuration.Servers = append(configuration.Servers, raft.Server{
ID: raft.ServerID(cfg.LocalPeer.ID),
Address: raft.ServerAddress(localAddress),
})
// If we want to start a node as leader then we will not add any remote peers, this will leave this as a cluster of one
// The remotePeers will add themselves to the cluster as they're added
if !cfg.Leader {
for _, p := range cfg.RemotePeers {
peerAddress := fmt.Sprintf("%s:%d", p.Address, p.Port)
if localAddress != peerAddress {
configuration.Servers = append(configuration.Servers, raft.Server{
ID: raft.ServerID(p.ID),
Address: raft.ServerAddress(peerAddress)})
}
}
log.Info("This node will attempt to start as Follower")
} else {
log.Info("This node will attempt to start as Leader")
}
if bootstrap {
if err := raft.BootstrapCluster(rc, logStore, stableStore, snapshots, transport, configuration); err != nil {
return err
}
}
//else {
// if err := raft.RecoverCluster(rc, c.stateMachine, logStore, stableStore, snapshots, transport, configuration); err != nil {
// return err
// }
//}
// Create RAFT instance
raftServer, err := raft.NewRaft(rc, c.stateMachine, logStore, stableStore, snapshots, transport)
if err != nil {
return err
}
ticker := time.NewTicker(time.Second)
time.Sleep(time.Second * 5)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
lead := raftServer.Leader()
leading := false
for {
l := raftServer.Leader()
if lead != l && string(l) != "" {
go c.Callbacks.OnNewLeader(string(l))
lead = l
}
if !leading && localAddress == string(raftServer.Leader()) {
leading = true
go c.Run(ctx)
}
select {
case leader := <-raftServer.LeaderCh():
if leader {
if !leading {
leading = true
go c.Run(ctx)
}
} else {
if leading {
cancel()
leading = false
ctx, cancel = context.WithCancel(context.Background())
}
}
case <-ticker.C:
case <-c.stop:
if leading {
cancel()
raftServer.LeadershipTransfer()
}
close(c.done)
return nil
}
}
return nil
}
func (c *Cluster) Run(ctx context.Context) {
defer func() {
handleCrash()
c.Callbacks.OnStoppedLeading()
}()
c.Callbacks.OnStartedLeading(ctx)
}
var reallyCrash = false
func handleCrash() {
if r := recover(); r != nil {
logPanic(r)
if reallyCrash {
panic(r)
}
}
}
// logPanic logs the caller tree when a panic occurs (except in the special case of http.ErrAbortHandler).
func logPanic(r interface{}) {
if r == http.ErrAbortHandler {
// honor the http.ErrAbortHandler sentinel panic value:
// ErrAbortHandler is a sentinel panic value to abort a handler.
// While any panic from ServeHTTP aborts the response to the client,
// panicking with ErrAbortHandler also suppresses logging of a stack trace to the server's error log.
return
}
// Same as stdlib http server code. Manually allocate stack trace buffer size
// to prevent excessively large logs
const size = 64 << 10
stacktrace := make([]byte, size)
stacktrace = stacktrace[:runtime.Stack(stacktrace, false)]
if _, ok := r.(string); ok {
klog.Errorf("Observed a panic: %s\n%s", r, stacktrace)
} else {
klog.Errorf("Observed a panic: %#v (%v)\n%s", r, r, stacktrace)
}
}
func (c *Cluster) Stop() {
close(c.stop)
<-c.done
}

32
pkg/cluster/state.go Normal file
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@ -0,0 +1,32 @@
package cluster
import (
"io"
"github.com/hashicorp/raft"
)
type FSM struct {
}
func (fsm FSM) Apply(log *raft.Log) interface{} {
return nil
}
func (fsm FSM) Restore(snap io.ReadCloser) error {
return nil
}
func (fsm FSM) Snapshot() (raft.FSMSnapshot, error) {
return Snapshot{}, nil
}
type Snapshot struct {
}
func (snapshot Snapshot) Persist(sink raft.SnapshotSink) error {
return nil
}
func (snapshot Snapshot) Release() {
}

48
pkg/config/config.go Normal file
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@ -0,0 +1,48 @@
package config
import (
"errors"
"gopkg.in/yaml.v2"
"os"
)
func ParseFile(file string) (cfg *Config, err error) {
if file == "" {
return nil, errors.New("missing config file")
}
f, err := os.Open(file)
if err != nil {
return
}
cfg = new(Config)
err = yaml.NewDecoder(f).Decode(cfg)
return
}
type Config struct {
DBFile string `yaml:"dbFile"`
Leader bool `yaml:"leader"`
AddressRange []string `yaml:"addressRange"`
// LocalPeer is the configuration of this host
LocalPeer RaftPeer `yaml:"localPeer"`
// Peers are all of the peers within the RAFT cluster
RemotePeers []RaftPeer `yaml:"remotePeers"`
// Interface is the network interface to bind to (default: First Adapter)
Interface string `yaml:"interface,omitempty"`
}
// RaftPeer details the configuration of all cluster peers
type RaftPeer struct {
ID string `yaml:"id"`
// IP Address of a peer instance
Address string `yaml:"address"`
// Listening port of this peer instance
Port int `yaml:"port"`
}

10
pkg/vip/arp.go Normal file
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@ -0,0 +1,10 @@
// +build !linux
package vip
import "fmt"
// ARPSendGratuitous is only supported on Linux, so return an error
func ARPSendGratuitous(address, ifaceName string) error {
return fmt.Errorf("Unsupported on this OS")
}

176
pkg/vip/arp_linux.go Normal file
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@ -0,0 +1,176 @@
// +build linux
// These syscalls are only supported on Linux, so this uses a build directive during compilation. Other OS's will use the arp_unsupported.go and recieve an error
package vip
import (
"bytes"
"encoding/binary"
"fmt"
"net"
"syscall"
"unsafe"
log "github.com/sirupsen/logrus"
)
const (
opARPRequest = 1
opARPReply = 2
hwLen = 6
)
var (
ethernetBroadcast = net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
// arpRequest is used to flip between garp request or garp reply
arpRequest = true
)
func htons(p uint16) uint16 {
var b [2]byte
binary.BigEndian.PutUint16(b[:], p)
return *(*uint16)(unsafe.Pointer(&b))
}
// arpHeader specifies the header for an ARP message.
type arpHeader struct {
hardwareType uint16
protocolType uint16
hardwareAddressLength uint8
protocolAddressLength uint8
opcode uint16
}
// arpMessage represents an ARP message.
type arpMessage struct {
arpHeader
senderHardwareAddress []byte
senderProtocolAddress []byte
targetHardwareAddress []byte
targetProtocolAddress []byte
}
// bytes returns the wire representation of the ARP message.
func (m *arpMessage) bytes() ([]byte, error) {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.BigEndian, m.arpHeader); err != nil {
return nil, fmt.Errorf("binary write failed: %v", err)
}
buf.Write(m.senderHardwareAddress)
buf.Write(m.senderProtocolAddress)
buf.Write(m.targetHardwareAddress)
buf.Write(m.targetProtocolAddress)
return buf.Bytes(), nil
}
// gratuitousARP return a gARP request or gARP reply alternatively
// because different devices may support either one of them
func gratuitousARP(ip net.IP, mac net.HardwareAddr) (*arpMessage, error) {
if ip.To4() == nil {
return nil, fmt.Errorf("%q is not an IPv4 address", ip)
}
if len(mac) != hwLen {
return nil, fmt.Errorf("%q is not an Ethernet MAC address", mac)
}
m := &arpMessage{
arpHeader: arpHeader{
1, // Ethernet
0x0800, // IPv4
hwLen, // 48-bit MAC Address
net.IPv4len, // 32-bit IPv4 Address
opARPReply, // ARP Reply
},
}
// https://tools.ietf.org/html/rfc5944#section-4.6
// In either case, the ARP Sender Hardware Address is
// set to the link-layer address to which this cache entry should be
// updated.
m.senderHardwareAddress = mac
// When using an ARP Reply packet, the Target Hardware
// Address is also set to the link-layer address to which this cache
// entry should be updated (this field is not used in an ARP Request
// packet).
m.targetHardwareAddress = mac
// In either case, the ARP Sender Protocol Address and
// ARP Target Protocol Address are both set to the IP address of the
// cache entry to be updated,
m.senderProtocolAddress = ip.To4()
m.targetProtocolAddress = ip.To4()
// send arpRequest and arpReply alternatively
arpRequest = !arpRequest
if arpRequest {
m.arpHeader.opcode = opARPRequest
// this field is not used in an ARP Request packet
m.targetHardwareAddress = ethernetBroadcast
}
return m, nil
}
// sendARP sends the given ARP message via the specified interface.
func sendARP(iface *net.Interface, m *arpMessage) error {
fd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_DGRAM, int(htons(syscall.ETH_P_ARP)))
if err != nil {
return fmt.Errorf("failed to get raw socket: %v", err)
}
defer syscall.Close(fd)
if err := syscall.BindToDevice(fd, iface.Name); err != nil {
return fmt.Errorf("failed to bind to device: %v", err)
}
ll := syscall.SockaddrLinklayer{
Protocol: htons(syscall.ETH_P_ARP),
Ifindex: iface.Index,
Pkttype: 0, // syscall.PACKET_HOST
Hatype: m.hardwareType,
Halen: m.hardwareAddressLength,
}
target := ethernetBroadcast
for i := 0; i < len(target); i++ {
ll.Addr[i] = target[i]
}
b, err := m.bytes()
if err != nil {
return fmt.Errorf("failed to convert ARP message: %v", err)
}
if err := syscall.Bind(fd, &ll); err != nil {
return fmt.Errorf("failed to bind: %v", err)
}
if err := syscall.Sendto(fd, b, 0, &ll); err != nil {
return fmt.Errorf("failed to send: %v", err)
}
return nil
}
// ARPSendGratuitous sends a gratuitous ARP message via the specified interface.
func ARPSendGratuitous(address, ifaceName string) error {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return fmt.Errorf("failed to get interface %q: %v", ifaceName, err)
}
ip := net.ParseIP(address)
if ip == nil {
return fmt.Errorf("failed to parse address %s", ip)
}
log.Infof("Broadcasting ARP update for %s (%s) via %s", address, iface.HardwareAddr, iface.Name)
m, err := gratuitousARP(ip, iface.HardwareAddr)
if err != nil {
return err
}
return sendARP(iface, m)
}

142
pkg/vip/vip.go Normal file
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@ -0,0 +1,142 @@
package vip
import (
"sync"
"github.com/pkg/errors"
"github.com/vishvananda/netlink"
)
const (
defaultValidLft = 60
)
// Network is an interface that enable managing operations for a given IP
type Network interface {
AddIP() error
DeleteIP() error
IsSet() (bool, error)
IP() string
SetIP(ip string) error
Interface() string
}
// network - This allows network configuration
type network struct {
mu sync.Mutex
address *netlink.Addr
link netlink.Link
isDNS bool
}
// NewConfig will attempt to provide an interface to the kernel network configuration
func NewConfig(address string, iface string) (Network, error) {
result := &network{}
link, err := netlink.LinkByName(iface)
if err != nil {
return result, errors.Wrapf(err, "could not get link for interface '%s'", iface)
}
result.link = link
if IsIP(address) {
result.address, err = netlink.ParseAddr(address + "/32")
if err != nil {
return result, errors.Wrapf(err, "could not parse address '%s'", address)
}
return result, nil
}
// try to resolve the address
ip, err := lookupHost(address)
result.isDNS = err == nil
if err != nil {
return nil, err
}
// we're able to resolve store this as the initial IP
if result.address, err = netlink.ParseAddr(ip + "/32"); err != nil {
return result, err
}
// set ValidLft so that the VIP expires if the DNS entry is updated, otherwise it'll be refreshed by the DNS prober
result.address.ValidLft = defaultValidLft
return result, err
}
//AddIP - Add an IP address to the interface
func (configurator *network) AddIP() error {
if err := netlink.AddrReplace(configurator.link, configurator.address); err != nil {
return errors.Wrap(err, "could not add ip")
}
return nil
}
//DeleteIP - Remove an IP address from the interface
func (configurator *network) DeleteIP() error {
result, err := configurator.IsSet()
if err != nil {
return errors.Wrap(err, "ip check in DeleteIP failed")
}
// Nothing to delete
if !result {
return nil
}
if err = netlink.AddrDel(configurator.link, configurator.address); err != nil {
return errors.Wrap(err, "could not delete ip")
}
return nil
}
// IsSet - Check to see if VIP is set
func (configurator *network) IsSet() (result bool, err error) {
var addresses []netlink.Addr
addresses, err = netlink.AddrList(configurator.link, 0)
if err != nil {
err = errors.Wrap(err, "could not list addresses")
return
}
for _, address := range addresses {
if address.Equal(*configurator.address) {
return true, nil
}
}
return false, nil
}
// SetIP updates the IP that is used
func (configurator *network) SetIP(ip string) error {
configurator.mu.Lock()
defer configurator.mu.Unlock()
addr, err := netlink.ParseAddr(ip + "/32")
if err != nil {
return err
}
if configurator.address != nil && configurator.isDNS {
addr.ValidLft = defaultValidLft
}
configurator.address = addr
return nil
}
// IP - return the IP Address
func (configurator *network) IP() string {
configurator.mu.Lock()
defer configurator.mu.Unlock()
return configurator.address.IP.String()
}
// Interface - return the Interface name
func (configurator *network) Interface() string {
return configurator.link.Attrs().Name
}

7
run.sh Executable file
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@ -0,0 +1,7 @@
#!/bin/sh
cd data
#rm -f node*
../vipman -config config1.yaml &
../vipman -config config2.yaml &
../vipman -config config3.yaml

14
vipman.yaml Normal file
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dbFile: ""
addressRange:
- ""
localPeer:
id: ""
address: ""
port: 0
remotePeers:
- id: ""
address: ""
port: 0
- id: ""
address: ""
port: 0