328 lines
7.7 KiB
Go
328 lines
7.7 KiB
Go
package ingress
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import (
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"context"
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"fmt"
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"net"
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"net/netip"
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"strings"
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"sync"
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"testing"
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"github.com/google/gopacket/layers"
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"github.com/rs/zerolog"
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"github.com/stretchr/testify/require"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"github.com/cloudflare/cloudflared/packet"
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)
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var (
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noopLogger = zerolog.Nop()
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localhostIP = netip.MustParseAddr("127.0.0.1")
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localhostIPv6 = netip.MustParseAddr("::1")
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)
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// TestICMPProxyEcho makes sure we can send ICMP echo via the Request method and receives response via the
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// ListenResponse method
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//
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// Note: if this test fails on your device under Linux, then most likely you need to make sure that your user
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// is allowed in ping_group_range. See the following gist for how to do that:
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// https://github.com/ValentinBELYN/icmplib/blob/main/docs/6-use-icmplib-without-privileges.md
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func TestICMPRouterEcho(t *testing.T) {
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testICMPRouterEcho(t, true)
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testICMPRouterEcho(t, false)
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}
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func testICMPRouterEcho(t *testing.T, sendIPv4 bool) {
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const (
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echoID = 36571
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endSeq = 20
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)
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router, err := NewICMPRouter(localhostIP, localhostIPv6, "", &noopLogger)
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require.NoError(t, err)
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proxyDone := make(chan struct{})
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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router.Serve(ctx)
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close(proxyDone)
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}()
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responder := echoFlowResponder{
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decoder: packet.NewICMPDecoder(),
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respChan: make(chan []byte, 1),
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}
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protocol := layers.IPProtocolICMPv6
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if sendIPv4 {
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protocol = layers.IPProtocolICMPv4
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}
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localIPs := getLocalIPs(t, sendIPv4)
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ips := make([]*packet.IP, len(localIPs))
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for i, localIP := range localIPs {
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ips[i] = &packet.IP{
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Src: localIP,
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Dst: localIP,
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Protocol: protocol,
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TTL: packet.DefaultTTL,
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}
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}
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var icmpType icmp.Type = ipv6.ICMPTypeEchoRequest
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if sendIPv4 {
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icmpType = ipv4.ICMPTypeEcho
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}
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for seq := 0; seq < endSeq; seq++ {
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for i, ip := range ips {
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pk := packet.ICMP{
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IP: ip,
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Message: &icmp.Message{
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Type: icmpType,
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Code: 0,
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Body: &icmp.Echo{
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ID: echoID + i,
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Seq: seq,
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Data: []byte(fmt.Sprintf("icmp echo seq %d", seq)),
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},
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},
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}
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require.NoError(t, router.Request(&pk, &responder))
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responder.validate(t, &pk)
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}
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}
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cancel()
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<-proxyDone
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}
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// TestConcurrentRequests makes sure icmpRouter can send concurrent requests to the same destination with different
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// echo ID. This simulates concurrent ping to the same destination.
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func TestConcurrentRequestsToSameDst(t *testing.T) {
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const (
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concurrentPings = 5
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endSeq = 5
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)
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router, err := NewICMPRouter(localhostIP, localhostIPv6, "", &noopLogger)
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require.NoError(t, err)
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proxyDone := make(chan struct{})
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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router.Serve(ctx)
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close(proxyDone)
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}()
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var wg sync.WaitGroup
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// icmpv4 and icmpv6 each has concurrentPings
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wg.Add(concurrentPings * 2)
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for i := 0; i < concurrentPings; i++ {
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echoID := 38451 + i
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go func() {
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defer wg.Done()
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responder := echoFlowResponder{
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decoder: packet.NewICMPDecoder(),
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respChan: make(chan []byte, 1),
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}
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for seq := 0; seq < endSeq; seq++ {
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pk := &packet.ICMP{
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IP: &packet.IP{
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Src: localhostIP,
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Dst: localhostIP,
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Protocol: layers.IPProtocolICMPv4,
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TTL: packet.DefaultTTL,
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},
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Message: &icmp.Message{
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Type: ipv4.ICMPTypeEcho,
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Code: 0,
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Body: &icmp.Echo{
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ID: echoID,
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Seq: seq,
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Data: []byte(fmt.Sprintf("icmpv4 echo id %d, seq %d", echoID, seq)),
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},
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},
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}
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require.NoError(t, router.Request(pk, &responder))
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responder.validate(t, pk)
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}
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}()
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go func() {
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defer wg.Done()
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responder := echoFlowResponder{
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decoder: packet.NewICMPDecoder(),
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respChan: make(chan []byte, 1),
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}
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for seq := 0; seq < endSeq; seq++ {
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pk := &packet.ICMP{
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IP: &packet.IP{
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Src: localhostIPv6,
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Dst: localhostIPv6,
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Protocol: layers.IPProtocolICMPv6,
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TTL: packet.DefaultTTL,
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},
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Message: &icmp.Message{
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Type: ipv6.ICMPTypeEchoRequest,
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Code: 0,
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Body: &icmp.Echo{
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ID: echoID,
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Seq: seq,
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Data: []byte(fmt.Sprintf("icmpv6 echo id %d, seq %d", echoID, seq)),
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},
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},
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}
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require.NoError(t, router.Request(pk, &responder))
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responder.validate(t, pk)
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}
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}()
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}
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wg.Wait()
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cancel()
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<-proxyDone
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}
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// TestICMPProxyRejectNotEcho makes sure it rejects messages other than echo
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func TestICMPRouterRejectNotEcho(t *testing.T) {
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msgs := []icmp.Message{
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{
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Type: ipv4.ICMPTypeDestinationUnreachable,
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Code: 1,
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Body: &icmp.DstUnreach{
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Data: []byte("original packet"),
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},
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},
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{
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Type: ipv4.ICMPTypeTimeExceeded,
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Code: 1,
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Body: &icmp.TimeExceeded{
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Data: []byte("original packet"),
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},
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},
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{
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Type: ipv4.ICMPType(2),
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Code: 0,
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Body: &icmp.PacketTooBig{
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MTU: 1280,
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Data: []byte("original packet"),
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},
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},
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}
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testICMPRouterRejectNotEcho(t, localhostIP, msgs)
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msgsV6 := []icmp.Message{
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{
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Type: ipv6.ICMPTypeDestinationUnreachable,
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Code: 3,
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Body: &icmp.DstUnreach{
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Data: []byte("original packet"),
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},
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},
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{
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Type: ipv6.ICMPTypeTimeExceeded,
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Code: 0,
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Body: &icmp.TimeExceeded{
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Data: []byte("original packet"),
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},
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},
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{
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Type: ipv6.ICMPTypePacketTooBig,
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Code: 0,
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Body: &icmp.PacketTooBig{
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MTU: 1280,
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Data: []byte("original packet"),
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},
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},
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}
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testICMPRouterRejectNotEcho(t, localhostIPv6, msgsV6)
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}
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func testICMPRouterRejectNotEcho(t *testing.T, srcDstIP netip.Addr, msgs []icmp.Message) {
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router, err := NewICMPRouter(localhostIP, localhostIPv6, "", &noopLogger)
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require.NoError(t, err)
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responder := echoFlowResponder{
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decoder: packet.NewICMPDecoder(),
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respChan: make(chan []byte),
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}
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protocol := layers.IPProtocolICMPv4
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if srcDstIP.Is6() {
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protocol = layers.IPProtocolICMPv6
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}
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for _, m := range msgs {
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pk := packet.ICMP{
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IP: &packet.IP{
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Src: srcDstIP,
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Dst: srcDstIP,
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Protocol: protocol,
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TTL: packet.DefaultTTL,
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},
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Message: &m,
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}
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require.Error(t, router.Request(&pk, &responder))
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}
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}
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type echoFlowResponder struct {
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lock sync.Mutex
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decoder *packet.ICMPDecoder
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respChan chan []byte
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}
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func (efr *echoFlowResponder) SendPacket(dst netip.Addr, pk packet.RawPacket) error {
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efr.lock.Lock()
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defer efr.lock.Unlock()
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copiedPacket := make([]byte, len(pk.Data))
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copy(copiedPacket, pk.Data)
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efr.respChan <- copiedPacket
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return nil
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}
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func (efr *echoFlowResponder) Close() error {
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efr.lock.Lock()
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defer efr.lock.Unlock()
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close(efr.respChan)
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return nil
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}
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func (efr *echoFlowResponder) validate(t *testing.T, echoReq *packet.ICMP) {
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pk := <-efr.respChan
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decoded, err := efr.decoder.Decode(packet.RawPacket{Data: pk})
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require.NoError(t, err)
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require.Equal(t, decoded.Src, echoReq.Dst)
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require.Equal(t, decoded.Dst, echoReq.Src)
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require.Equal(t, echoReq.Protocol, decoded.Protocol)
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if echoReq.Type == ipv4.ICMPTypeEcho {
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require.Equal(t, ipv4.ICMPTypeEchoReply, decoded.Type)
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} else {
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require.Equal(t, ipv6.ICMPTypeEchoReply, decoded.Type)
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}
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require.Equal(t, 0, decoded.Code)
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require.NotZero(t, decoded.Checksum)
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require.Equal(t, echoReq.Body, decoded.Body)
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}
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func getLocalIPs(t *testing.T, ipv4 bool) []netip.Addr {
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interfaces, err := net.Interfaces()
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require.NoError(t, err)
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localIPs := []netip.Addr{}
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for _, i := range interfaces {
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// Skip TUN devices
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if strings.Contains(i.Name, "tun") {
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continue
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}
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addrs, err := i.Addrs()
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require.NoError(t, err)
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for _, addr := range addrs {
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if ipnet, ok := addr.(*net.IPNet); ok && (ipnet.IP.IsPrivate() || ipnet.IP.IsLoopback()) {
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if (ipv4 && ipnet.IP.To4() != nil) || (!ipv4 && ipnet.IP.To4() == nil) {
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localIPs = append(localIPs, netip.MustParseAddr(ipnet.IP.String()))
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}
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}
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}
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}
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return localIPs
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}
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