traefik/pkg/tcp/proxy_test.go

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package tcp
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"sync"
"testing"
"time"
"github.com/pires/go-proxyproto"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
)
func fakeRedis(t *testing.T, listener net.Listener) {
for {
conn, err := listener.Accept()
fmt.Println("Accept on server")
require.NoError(t, err)
for {
withErr := false
buf := make([]byte, 64)
if _, err := conn.Read(buf); err != nil {
withErr = true
}
if string(buf[:4]) == "ping" {
time.Sleep(1 * time.Millisecond)
if _, err := conn.Write([]byte("PONG")); err != nil {
_ = conn.Close()
return
}
}
if withErr {
_ = conn.Close()
return
}
}
}
}
func TestCloseWrite(t *testing.T) {
backendListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
go fakeRedis(t, backendListener)
_, port, err := net.SplitHostPort(backendListener.Addr().String())
require.NoError(t, err)
proxy, err := NewProxy(":"+port, 10*time.Millisecond, nil)
require.NoError(t, err)
proxyListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
go func() {
for {
conn, err := proxyListener.Accept()
require.NoError(t, err)
proxy.ServeTCP(conn.(*net.TCPConn))
}
}()
_, port, err = net.SplitHostPort(proxyListener.Addr().String())
require.NoError(t, err)
conn, err := net.Dial("tcp", ":"+port)
require.NoError(t, err)
_, err = conn.Write([]byte("ping\n"))
require.NoError(t, err)
err = conn.(*net.TCPConn).CloseWrite()
require.NoError(t, err)
var buf []byte
buffer := bytes.NewBuffer(buf)
n, err := io.Copy(buffer, conn)
require.NoError(t, err)
require.Equal(t, int64(4), n)
require.Equal(t, "PONG", buffer.String())
}
func TestProxyProtocol(t *testing.T) {
testCases := []struct {
desc string
version int
}{
{
desc: "PROXY protocol v1",
version: 1,
},
{
desc: "PROXY protocol v2",
version: 2,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
backendListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
var version int
proxyBackendListener := proxyproto.Listener{
Listener: backendListener,
ValidateHeader: func(h *proxyproto.Header) error {
version = int(h.Version)
return nil
},
Policy: func(upstream net.Addr) (proxyproto.Policy, error) {
switch test.version {
case 1, 2:
return proxyproto.USE, nil
default:
return proxyproto.REQUIRE, errors.New("unsupported version")
}
},
}
defer proxyBackendListener.Close()
go fakeRedis(t, &proxyBackendListener)
_, port, err := net.SplitHostPort(proxyBackendListener.Addr().String())
require.NoError(t, err)
proxy, err := NewProxy(":"+port, 10*time.Millisecond, &dynamic.ProxyProtocol{Version: test.version})
require.NoError(t, err)
proxyListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
go func() {
for {
conn, err := proxyListener.Accept()
require.NoError(t, err)
proxy.ServeTCP(conn.(*net.TCPConn))
}
}()
_, port, err = net.SplitHostPort(proxyListener.Addr().String())
require.NoError(t, err)
conn, err := net.Dial("tcp", ":"+port)
require.NoError(t, err)
_, err = conn.Write([]byte("ping\n"))
require.NoError(t, err)
err = conn.(*net.TCPConn).CloseWrite()
require.NoError(t, err)
var buf []byte
buffer := bytes.NewBuffer(buf)
n, err := io.Copy(buffer, conn)
require.NoError(t, err)
assert.Equal(t, int64(4), n)
assert.Equal(t, "PONG", buffer.String())
assert.Equal(t, test.version, version)
})
}
}
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func TestLookupAddress(t *testing.T) {
testCases := []struct {
desc string
address string
expectSame assert.ComparisonAssertionFunc
}{
{
desc: "IP doesn't need refresh",
address: "8.8.4.4:53",
expectSame: assert.Same,
},
{
desc: "Hostname needs refresh",
address: "dns.google:53",
expectSame: assert.NotSame,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
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proxy, err := NewProxy(test.address, 10*time.Millisecond, nil)
require.NoError(t, err)
require.NotNil(t, proxy.target)
proxyListener, err := net.Listen("tcp", ":0")
require.NoError(t, err)
var wg sync.WaitGroup
go func(wg *sync.WaitGroup) {
for {
conn, err := proxyListener.Accept()
require.NoError(t, err)
proxy.ServeTCP(conn.(*net.TCPConn))
wg.Done()
}
}(&wg)
var lastTarget *net.TCPAddr
for i := 0; i < 3; i++ {
wg.Add(1)
conn, err := net.Dial("tcp", proxyListener.Addr().String())
require.NoError(t, err)
_, err = conn.Write([]byte("ping\n"))
require.NoError(t, err)
err = conn.Close()
require.NoError(t, err)
wg.Wait()
assert.NotNil(t, proxy.target)
if lastTarget != nil {
test.expectSame(t, lastTarget, proxy.target)
}
lastTarget = proxy.target
}
})
}
}