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net_test.go
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net_test.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package memberlist
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"log"
"net"
"reflect"
"strconv"
"strings"
"testing"
"time"
"github.com/hashicorp/go-msgpack/v2/codec"
"github.com/stretchr/testify/require"
)
// As a regression we left this test very low-level and network-ey, even after
// we abstracted the transport. We added some basic network-free transport tests
// in transport_test.go to prove that we didn't hard code some network stuff
// outside of NetTransport.
func TestHandleCompoundPing(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
udpAddr := udp.LocalAddr().(*net.UDPAddr)
// Encode a ping
ping := ping{
SeqNo: 42,
SourceAddr: udpAddr.IP,
SourcePort: uint16(udpAddr.Port),
SourceNode: "test",
}
buf, err := encode(pingMsg, ping, m.config.MsgpackUseNewTimeFormat)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Make a compound message
compound := makeCompoundMessage([][]byte{buf.Bytes(), buf.Bytes(), buf.Bytes()})
// Send compound version
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
_, err = udp.WriteTo(compound.Bytes(), addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Wait for responses
doneCh := make(chan struct{}, 1)
go func() {
select {
case <-doneCh:
case <-time.After(2 * time.Second):
panic("timeout")
}
}()
for i := 0; i < 3; i++ {
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
msgType := messageType(in[0])
if msgType != ackRespMsg {
t.Fatalf("bad response %v", in)
}
var ack ackResp
if err := decode(in[1:], &ack); err != nil {
t.Fatalf("unexpected err %s", err)
}
if ack.SeqNo != 42 {
t.Fatalf("bad sequence no")
}
}
doneCh <- struct{}{}
}
func TestHandlePing(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
udpAddr := udp.LocalAddr().(*net.UDPAddr)
// Encode a ping
ping := ping{
SeqNo: 42,
SourceAddr: udpAddr.IP,
SourcePort: uint16(udpAddr.Port),
SourceNode: "test",
}
buf, err := encode(pingMsg, ping, m.config.MsgpackUseNewTimeFormat)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Send
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
_, err = udp.WriteTo(buf.Bytes(), addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Wait for response
doneCh := make(chan struct{}, 1)
go func() {
select {
case <-doneCh:
case <-time.After(2 * time.Second):
panic("timeout")
}
}()
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
msgType := messageType(in[0])
if msgType != ackRespMsg {
t.Fatalf("bad response %v", in)
}
var ack ackResp
if err := decode(in[1:], &ack); err != nil {
t.Fatalf("unexpected err %s", err)
}
if ack.SeqNo != 42 {
t.Fatalf("bad sequence no")
}
doneCh <- struct{}{}
}
func TestHandlePing_WrongNode(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
udpAddr := udp.LocalAddr().(*net.UDPAddr)
// Encode a ping, wrong node!
ping := ping{
SeqNo: 42,
Node: m.config.Name + "-bad",
SourceAddr: udpAddr.IP,
SourcePort: uint16(udpAddr.Port),
SourceNode: "test",
}
buf, err := encode(pingMsg, ping, m.config.MsgpackUseNewTimeFormat)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Send
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
_, err = udp.WriteTo(buf.Bytes(), addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Wait for response
udp.SetDeadline(time.Now().Add(50 * time.Millisecond))
in := make([]byte, 1500)
_, _, err = udp.ReadFrom(in)
// Should get an i/o timeout
if err == nil {
t.Fatalf("expected err %s", err)
}
}
func TestHandleIndirectPing(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
udpAddr := udp.LocalAddr().(*net.UDPAddr)
// Encode an indirect ping
ind := indirectPingReq{
SeqNo: 100,
Target: net.ParseIP(m.config.BindAddr),
Port: uint16(m.config.BindPort),
Node: m.config.Name,
SourceAddr: udpAddr.IP,
SourcePort: uint16(udpAddr.Port),
SourceNode: "test",
}
buf, err := encode(indirectPingMsg, &ind, m.config.MsgpackUseNewTimeFormat)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Send
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
_, err = udp.WriteTo(buf.Bytes(), addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Wait for response
doneCh := make(chan struct{}, 1)
go func() {
select {
case <-doneCh:
case <-time.After(2 * time.Second):
panic("timeout")
}
}()
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
msgType := messageType(in[0])
if msgType != ackRespMsg {
t.Fatalf("bad response %v", in)
}
var ack ackResp
if err := decode(in[1:], &ack); err != nil {
t.Fatalf("unexpected err %s", err)
}
if ack.SeqNo != 100 {
t.Fatalf("bad sequence no")
}
doneCh <- struct{}{}
}
func TestTCPPing(t *testing.T) {
var tcp *net.TCPListener
var tcpAddr *net.TCPAddr
for port := 60000; port < 61000; port++ {
tcpAddr = &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: port}
tcpLn, err := net.ListenTCP("tcp", tcpAddr)
if err == nil {
tcp = tcpLn
break
}
}
if tcp == nil {
t.Fatalf("no tcp listener")
}
tcpAddr2 := Address{Addr: tcpAddr.String(), Name: "test"}
// Note that tcp gets closed in the last test, so we avoid a deferred
// Close() call here.
m := GetMemberlist(t, nil)
defer m.Shutdown()
pingTimeout := m.config.ProbeInterval
pingTimeMax := m.config.ProbeInterval + 10*time.Millisecond
// Do a normal round trip.
pingOut := ping{SeqNo: 23, Node: "mongo"}
pingErrCh := make(chan error, 1)
go func() {
tcp.SetDeadline(time.Now().Add(pingTimeMax))
conn, err := tcp.AcceptTCP()
if err != nil {
pingErrCh <- fmt.Errorf("failed to connect: %s", err)
return
}
defer conn.Close()
msgType, _, dec, err := m.readStream(conn, "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to read ping: %s", err)
return
}
if msgType != pingMsg {
pingErrCh <- fmt.Errorf("expecting ping, got message type (%d)", msgType)
return
}
var pingIn ping
if err := dec.Decode(&pingIn); err != nil {
pingErrCh <- fmt.Errorf("failed to decode ping: %s", err)
return
}
if pingIn.SeqNo != pingOut.SeqNo {
pingErrCh <- fmt.Errorf("sequence number isn't correct (%d) vs (%d)", pingIn.SeqNo, pingOut.SeqNo)
return
}
if pingIn.Node != pingOut.Node {
pingErrCh <- fmt.Errorf("node name isn't correct (%s) vs (%s)", pingIn.Node, pingOut.Node)
return
}
ack := ackResp{pingIn.SeqNo, nil}
out, err := encode(ackRespMsg, &ack, m.config.MsgpackUseNewTimeFormat)
if err != nil {
pingErrCh <- fmt.Errorf("failed to encode ack: %s", err)
return
}
err = m.rawSendMsgStream(conn, out.Bytes(), "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to send ack: %s", err)
return
}
pingErrCh <- nil
}()
deadline := time.Now().Add(pingTimeout)
didContact, err := m.sendPingAndWaitForAck(tcpAddr2, pingOut, deadline)
if err != nil {
t.Fatalf("error trying to ping: %s", err)
}
if !didContact {
t.Fatalf("expected successful ping")
}
if err = <-pingErrCh; err != nil {
t.Fatal(err)
}
// Make sure a mis-matched sequence number is caught.
go func() {
tcp.SetDeadline(time.Now().Add(pingTimeMax))
conn, err := tcp.AcceptTCP()
if err != nil {
pingErrCh <- fmt.Errorf("failed to connect: %s", err)
return
}
defer conn.Close()
_, _, dec, err := m.readStream(conn, "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to read ping: %s", err)
return
}
var pingIn ping
if err := dec.Decode(&pingIn); err != nil {
pingErrCh <- fmt.Errorf("failed to decode ping: %s", err)
return
}
ack := ackResp{pingIn.SeqNo + 1, nil}
out, err := encode(ackRespMsg, &ack, m.config.MsgpackUseNewTimeFormat)
if err != nil {
pingErrCh <- fmt.Errorf("failed to encode ack: %s", err)
return
}
err = m.rawSendMsgStream(conn, out.Bytes(), "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to send ack: %s", err)
return
}
pingErrCh <- nil
}()
deadline = time.Now().Add(pingTimeout)
didContact, err = m.sendPingAndWaitForAck(tcpAddr2, pingOut, deadline)
if err == nil || !strings.Contains(err.Error(), "Sequence number") {
t.Fatalf("expected an error from mis-matched sequence number")
}
if didContact {
t.Fatalf("expected failed ping")
}
if err = <-pingErrCh; err != nil {
t.Fatal(err)
}
// Make sure an unexpected message type is handled gracefully.
go func() {
tcp.SetDeadline(time.Now().Add(pingTimeMax))
conn, err := tcp.AcceptTCP()
if err != nil {
pingErrCh <- fmt.Errorf("failed to connect: %s", err)
return
}
defer conn.Close()
_, _, _, err = m.readStream(conn, "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to read ping: %s", err)
return
}
bogus := indirectPingReq{}
out, err := encode(indirectPingMsg, &bogus, m.config.MsgpackUseNewTimeFormat)
if err != nil {
pingErrCh <- fmt.Errorf("failed to encode bogus msg: %s", err)
return
}
err = m.rawSendMsgStream(conn, out.Bytes(), "")
if err != nil {
pingErrCh <- fmt.Errorf("failed to send bogus msg: %s", err)
return
}
pingErrCh <- nil
}()
deadline = time.Now().Add(pingTimeout)
didContact, err = m.sendPingAndWaitForAck(tcpAddr2, pingOut, deadline)
if err == nil || !strings.Contains(err.Error(), "Unexpected msgType") {
t.Fatalf("expected an error from bogus message")
}
if didContact {
t.Fatalf("expected failed ping")
}
if err = <-pingErrCh; err != nil {
t.Fatal(err)
}
// Make sure failed I/O respects the deadline. In this case we try the
// common case of the receiving node being totally down.
tcp.Close()
deadline = time.Now().Add(pingTimeout)
startPing := time.Now()
didContact, err = m.sendPingAndWaitForAck(tcpAddr2, pingOut, deadline)
pingTime := time.Now().Sub(startPing)
if err != nil {
t.Fatalf("expected no error during ping on closed socket, got: %s", err)
}
if didContact {
t.Fatalf("expected failed ping")
}
if pingTime > pingTimeMax {
t.Fatalf("took too long to fail ping, %9.6f", pingTime.Seconds())
}
}
func TestTCPPushPull(t *testing.T) {
m := GetMemberlist(t, nil)
defer m.Shutdown()
m.nodes = append(m.nodes, &nodeState{
Node: Node{
Name: "Test 0",
Addr: net.ParseIP(m.config.BindAddr),
Port: uint16(m.config.BindPort),
},
Incarnation: 0,
State: StateSuspect,
StateChange: time.Now().Add(-1 * time.Second),
})
addr := net.JoinHostPort(m.config.BindAddr, strconv.Itoa(m.config.BindPort))
conn, err := net.Dial("tcp", addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
defer conn.Close()
localNodes := make([]pushNodeState, 3)
localNodes[0].Name = "Test 0"
localNodes[0].Addr = net.ParseIP(m.config.BindAddr)
localNodes[0].Port = uint16(m.config.BindPort)
localNodes[0].Incarnation = 1
localNodes[0].State = StateAlive
localNodes[1].Name = "Test 1"
localNodes[1].Addr = net.ParseIP(m.config.BindAddr)
localNodes[1].Port = uint16(m.config.BindPort)
localNodes[1].Incarnation = 1
localNodes[1].State = StateAlive
localNodes[2].Name = "Test 2"
localNodes[2].Addr = net.ParseIP(m.config.BindAddr)
localNodes[2].Port = uint16(m.config.BindPort)
localNodes[2].Incarnation = 1
localNodes[2].State = StateAlive
// Send our node state
header := pushPullHeader{Nodes: 3}
hd := codec.MsgpackHandle{
BasicHandle: codec.BasicHandle{
TimeNotBuiltin: !m.config.MsgpackUseNewTimeFormat,
},
}
enc := codec.NewEncoder(conn, &hd)
// Send the push/pull indicator
conn.Write([]byte{byte(pushPullMsg)})
if err := enc.Encode(&header); err != nil {
t.Fatalf("unexpected err %s", err)
}
for i := 0; i < header.Nodes; i++ {
if err := enc.Encode(&localNodes[i]); err != nil {
t.Fatalf("unexpected err %s", err)
}
}
// Read the message type
var msgType messageType
if err := binary.Read(conn, binary.BigEndian, &msgType); err != nil {
t.Fatalf("unexpected err %s", err)
}
var bufConn io.Reader = conn
msghd := codec.MsgpackHandle{
BasicHandle: codec.BasicHandle{
TimeNotBuiltin: !m.config.MsgpackUseNewTimeFormat,
},
}
dec := codec.NewDecoder(bufConn, &msghd)
// Check if we have a compressed message
if msgType == compressMsg {
var c compress
if err := dec.Decode(&c); err != nil {
t.Fatalf("unexpected err %s", err)
}
decomp, err := decompressBuffer(&c)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Reset the message type
msgType = messageType(decomp[0])
// Create a new bufConn
bufConn = bytes.NewReader(decomp[1:])
// Create a new decoder
dec = codec.NewDecoder(bufConn, &hd)
}
// Quit if not push/pull
if msgType != pushPullMsg {
t.Fatalf("bad message type")
}
if err := dec.Decode(&header); err != nil {
t.Fatalf("unexpected err %s", err)
}
// Allocate space for the transfer
remoteNodes := make([]pushNodeState, header.Nodes)
// Try to decode all the states
for i := 0; i < header.Nodes; i++ {
if err := dec.Decode(&remoteNodes[i]); err != nil {
t.Fatalf("unexpected err %s", err)
}
}
if len(remoteNodes) != 1 {
t.Fatalf("bad response")
}
n := &remoteNodes[0]
if n.Name != "Test 0" {
t.Fatalf("bad name")
}
if bytes.Compare(n.Addr, net.ParseIP(m.config.BindAddr)) != 0 {
t.Fatal("bad addr")
}
if n.Incarnation != 0 {
t.Fatal("bad incarnation")
}
if n.State != StateSuspect {
t.Fatal("bad state")
}
}
func TestSendMsg_Piggyback(t *testing.T) {
m := GetMemberlist(t, nil)
defer m.Shutdown()
// Add a message to be broadcast
a := alive{
Incarnation: 10,
Node: "rand",
Addr: []byte{127, 0, 0, 255},
Meta: nil,
Vsn: []uint8{
ProtocolVersionMin, ProtocolVersionMax, ProtocolVersionMin,
1, 1, 1,
},
}
m.encodeAndBroadcast("rand", aliveMsg, &a)
udp := listenUDP(t)
defer udp.Close()
udpAddr := udp.LocalAddr().(*net.UDPAddr)
// Encode a ping
ping := ping{
SeqNo: 42,
SourceAddr: udpAddr.IP,
SourcePort: uint16(udpAddr.Port),
SourceNode: "test",
}
buf, err := encode(pingMsg, ping, m.config.MsgpackUseNewTimeFormat)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Send
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
_, err = udp.WriteTo(buf.Bytes(), addr)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Wait for response
doneCh := make(chan struct{}, 1)
go func() {
select {
case <-doneCh:
case <-time.After(2 * time.Second):
panic("timeout")
}
}()
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
msgType := messageType(in[0])
if msgType != compoundMsg {
t.Fatalf("bad response %v", in)
}
// get the parts
trunc, parts, err := decodeCompoundMessage(in[1:])
if trunc != 0 {
t.Fatalf("unexpected truncation")
}
if len(parts) != 2 {
t.Fatalf("unexpected parts %v", parts)
}
if err != nil {
t.Fatalf("unexpected err %s", err)
}
var ack ackResp
if err := decode(parts[0][1:], &ack); err != nil {
t.Fatalf("unexpected err %s", err)
}
if ack.SeqNo != 42 {
t.Fatalf("bad sequence no")
}
var aliveout alive
if err := decode(parts[1][1:], &aliveout); err != nil {
t.Fatalf("unexpected err %s", err)
}
if aliveout.Node != "rand" || aliveout.Incarnation != 10 {
t.Fatalf("bad mesg")
}
doneCh <- struct{}{}
}
func TestEncryptDecryptState(t *testing.T) {
state := []byte("this is our internal state...")
config := &Config{
SecretKey: []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
ProtocolVersion: ProtocolVersionMax,
}
sink := registerInMemorySink(t)
m, err := Create(config)
if err != nil {
t.Fatalf("err: %s", err)
}
defer m.Shutdown()
crypt, err := m.encryptLocalState(state, "")
if err != nil {
t.Fatalf("err: %v", err)
}
// Create reader, seek past the type byte
buf := bytes.NewReader(crypt)
buf.Seek(1, 0)
plain, err := m.decryptRemoteState(buf, "")
if err != nil {
t.Fatalf("err: %v", err)
}
verifySampleExists(t, "consul.usage.test.memberlist.size.remote", sink)
if !reflect.DeepEqual(state, plain) {
t.Fatalf("Decrypt failed: %v", plain)
}
}
func TestRawSendUdp_CRC(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
a := Address{
Addr: udp.LocalAddr().String(),
Name: "test",
}
// Pass a nil node with no nodes registered, should result in no checksum
payload := []byte{3, 3, 3, 3}
m.rawSendMsgPacket(a, nil, payload)
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
if len(in) != 4 {
t.Fatalf("bad: %v", in)
}
// Pass a non-nil node with PMax >= 5, should result in a checksum
m.rawSendMsgPacket(a, &Node{PMax: 5}, payload)
in = make([]byte, 1500)
n, _, err = udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
if len(in) != 9 {
t.Fatalf("bad: %v", in)
}
// Register a node with PMax >= 5 to be looked up, should result in a checksum
m.nodeMap["127.0.0.1"] = &nodeState{
Node: Node{PMax: 5},
}
m.rawSendMsgPacket(a, nil, payload)
in = make([]byte, 1500)
n, _, err = udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
if len(in) != 9 {
t.Fatalf("bad: %v", in)
}
}
func TestIngestPacket_CRC(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
a := Address{
Addr: udp.LocalAddr().String(),
Name: "test",
}
// Get a message with a checksum
payload := []byte{3, 3, 3, 3}
m.rawSendMsgPacket(a, &Node{PMax: 5}, payload)
in := make([]byte, 1500)
n, _, err := udp.ReadFrom(in)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
in = in[0:n]
if len(in) != 9 {
t.Fatalf("bad: %v", in)
}
// Corrupt the checksum
in[1] <<= 1
logs := &bytes.Buffer{}
logger := log.New(logs, "", 0)
m.logger = logger
m.ingestPacket(in, udp.LocalAddr(), time.Now())
if !strings.Contains(logs.String(), "invalid checksum") {
t.Fatalf("bad: %s", logs.String())
}
}
func TestIngestPacket_ExportedFunc_EmptyMessage(t *testing.T) {
m := GetMemberlist(t, func(c *Config) {
c.EnableCompression = false
})
defer m.Shutdown()
udp := listenUDP(t)
defer udp.Close()
emptyConn := &emptyReadNetConn{}
logs := &bytes.Buffer{}
logger := log.New(logs, "", 0)
m.logger = logger
type ingestionAwareTransport interface {
IngestPacket(conn net.Conn, addr net.Addr, now time.Time, shouldClose bool) error
}
err := m.transport.(ingestionAwareTransport).IngestPacket(emptyConn, udp.LocalAddr(), time.Now(), true)
require.Error(t, err)
require.Contains(t, err.Error(), "packet too short")
}
type emptyReadNetConn struct {
net.Conn
}
func (c *emptyReadNetConn) Read(b []byte) (n int, err error) {
return 0, io.EOF
}
func (c *emptyReadNetConn) Close() error {
return nil
}
func TestGossip_MismatchedKeys(t *testing.T) {
// Create two agents with different gossip keys
c1 := testConfig(t)
c1.SecretKey = []byte("4W6DGn2VQVqDEceOdmuRTQ==")
m1, err := Create(c1)
require.NoError(t, err)
defer m1.Shutdown()
bindPort := m1.config.BindPort
c2 := testConfig(t)
c2.BindPort = bindPort
c2.SecretKey = []byte("XhX/w702/JKKK7/7OtM9Ww==")
m2, err := Create(c2)
require.NoError(t, err)
defer m2.Shutdown()
// Make sure we get this error on the joining side
_, err = m2.Join([]string{c1.Name + "/" + c1.BindAddr})
if err == nil || !strings.Contains(err.Error(), "No installed keys could decrypt the message") {
t.Fatalf("bad: %s", err)
}
}
func listenUDP(t *testing.T) *net.UDPConn {
var udp *net.UDPConn
for port := 60000; port < 61000; port++ {
udpAddr := fmt.Sprintf("127.0.0.1:%d", port)
udpLn, err := net.ListenPacket("udp", udpAddr)
if err == nil {
udp = udpLn.(*net.UDPConn)
break
}
}
if udp == nil {
t.Fatalf("no udp listener")
}
return udp
}
func TestHandleCommand(t *testing.T) {
var buf bytes.Buffer
m := Memberlist{
logger: log.New(&buf, "", 0),
}
m.handleCommand(nil, &net.TCPAddr{Port: 12345}, time.Now())
require.Contains(t, buf.String(), "missing message type byte")
}