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c4ccdd1bd1
Before this fix, LikelyHomeRouterIP could return a 'self' IP that
doesn't correspond to the gateway address, since it picks the first
private address when iterating over the set interfaces as the 'self' IP,
without checking that the address corresponds with the
previously-detected gateway.
This behaviour was introduced by accident in aaf2df7, where we deleted
the following code:
for _, prefix := range privatev4s {
if prefix.Contains(gateway) && prefix.Contains(ip) {
myIP = ip
ok = true
return
}
}
Other than checking that 'gateway' and 'ip' were private IP addresses
(which were correctly replaced with a call to the netip.Addr.IsPrivate
method), it also implicitly checked that both 'gateway' and 'ip' were a
part of the *same* prefix, and thus likely to be the same interface.
Restore that behaviour by explicitly checking pfx.Contains(gateway),
which, given that the 'ip' variable is derived from our prefix 'pfx',
ensures that the 'self' IP will correspond to the returned 'gateway'.
Fixes #10466
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Iddd2ee70cefb9fb40071986fefeace9ca2441ee6
395 lines
8.8 KiB
Go
395 lines
8.8 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package interfaces
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import (
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"encoding/json"
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"net"
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"net/netip"
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"testing"
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"tailscale.com/tstest"
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)
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func TestGetState(t *testing.T) {
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st, err := GetState()
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if err != nil {
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t.Fatal(err)
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}
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j, err := json.MarshalIndent(st, "", "\t")
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if err != nil {
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t.Errorf("JSON: %v", err)
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}
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t.Logf("Got: %s", j)
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t.Logf("As string: %s", st)
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}
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func TestLikelyHomeRouterIP(t *testing.T) {
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ipnet := func(s string) net.Addr {
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ip, ipnet, err := net.ParseCIDR(s)
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ipnet.IP = ip
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if err != nil {
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t.Fatal(err)
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}
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return ipnet
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}
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mockInterfaces := []Interface{
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// Interface that's not running
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{
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Interface: &net.Interface{
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Index: 1,
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MTU: 1500,
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Name: "down0",
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Flags: net.FlagBroadcast | net.FlagMulticast,
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},
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AltAddrs: []net.Addr{
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ipnet("10.0.0.100/8"),
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},
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},
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// Interface that's up, but only has an IPv6 address
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{
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Interface: &net.Interface{
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Index: 2,
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MTU: 1500,
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Name: "ipsixonly0",
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Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
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},
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AltAddrs: []net.Addr{
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ipnet("76f9:2e7d:55dd:48e1:48d0:763a:b591:b1bc/64"),
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},
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},
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// Fake interface with a gateway to the internet
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{
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Interface: &net.Interface{
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Index: 3,
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MTU: 1500,
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Name: "fake0",
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Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
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},
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AltAddrs: []net.Addr{
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ipnet("23a1:99c9:3a88:1d29:74d4:957b:2133:3f4e/64"),
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ipnet("192.168.7.100/24"),
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},
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},
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}
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// Mock out the responses from netInterfaces()
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tstest.Replace(t, &altNetInterfaces, func() ([]Interface, error) {
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return mockInterfaces, nil
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})
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// Mock out the likelyHomeRouterIP to return a known gateway.
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tstest.Replace(t, &likelyHomeRouterIP, func() (netip.Addr, bool) {
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return netip.MustParseAddr("192.168.7.1"), true
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})
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gw, my, ok := LikelyHomeRouterIP()
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if !ok {
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t.Fatal("expected success")
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}
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t.Logf("myIP = %v; gw = %v", my, gw)
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if want := netip.MustParseAddr("192.168.7.1"); gw != want {
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t.Errorf("got gateway %v; want %v", gw, want)
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}
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if want := netip.MustParseAddr("192.168.7.100"); my != want {
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t.Errorf("got self IP %v; want %v", my, want)
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}
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// Verify that no IP is returned if there are no IPv4 addresses on
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// local interfaces.
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t.Run("NoIPv4Addrs", func(t *testing.T) {
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tstest.Replace(t, &mockInterfaces, []Interface{
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// Interface that's up, but only has an IPv6 address
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{
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Interface: &net.Interface{
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Index: 2,
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MTU: 1500,
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Name: "en0",
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Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
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},
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AltAddrs: []net.Addr{
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ipnet("76f9:2e7d:55dd:48e1:48d0:763a:b591:b1bc/64"),
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},
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},
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})
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_, _, ok := LikelyHomeRouterIP()
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if ok {
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t.Fatal("expected no success")
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}
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})
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}
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// https://github.com/tailscale/tailscale/issues/10466
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func TestLikelyHomeRouterIP_Prefix(t *testing.T) {
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ipnet := func(s string) net.Addr {
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ip, ipnet, err := net.ParseCIDR(s)
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ipnet.IP = ip
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if err != nil {
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t.Fatal(err)
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}
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return ipnet
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}
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mockInterfaces := []Interface{
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// Valid and running interface that doesn't have a route to the
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// internet, and comes before the interface that does.
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{
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Interface: &net.Interface{
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Index: 1,
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MTU: 1500,
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Name: "docker0",
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Flags: net.FlagUp |
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net.FlagBroadcast |
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net.FlagMulticast |
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net.FlagRunning,
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},
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AltAddrs: []net.Addr{
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ipnet("172.17.0.0/16"),
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},
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},
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// Fake interface with a gateway to the internet.
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{
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Interface: &net.Interface{
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Index: 2,
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MTU: 1500,
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Name: "fake0",
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Flags: net.FlagUp |
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net.FlagBroadcast |
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net.FlagMulticast |
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net.FlagRunning,
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},
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AltAddrs: []net.Addr{
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ipnet("192.168.7.100/24"),
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},
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},
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}
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// Mock out the responses from netInterfaces()
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tstest.Replace(t, &altNetInterfaces, func() ([]Interface, error) {
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return mockInterfaces, nil
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})
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// Mock out the likelyHomeRouterIP to return a known gateway.
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tstest.Replace(t, &likelyHomeRouterIP, func() (netip.Addr, bool) {
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return netip.MustParseAddr("192.168.7.1"), true
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})
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gw, my, ok := LikelyHomeRouterIP()
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if !ok {
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t.Fatal("expected success")
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}
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t.Logf("myIP = %v; gw = %v", my, gw)
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if want := netip.MustParseAddr("192.168.7.1"); gw != want {
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t.Errorf("got gateway %v; want %v", gw, want)
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}
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if want := netip.MustParseAddr("192.168.7.100"); my != want {
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t.Errorf("got self IP %v; want %v", my, want)
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}
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}
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func TestLikelyHomeRouterIP_NoMocks(t *testing.T) {
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// Verify that this works properly when called on a real live system,
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// without any mocks.
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gw, my, ok := LikelyHomeRouterIP()
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t.Logf("LikelyHomeRouterIP: gw=%v my=%v ok=%v", gw, my, ok)
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}
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func TestIsUsableV6(t *testing.T) {
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tests := []struct {
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name string
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ip string
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want bool
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}{
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{"first ULA", "fc00::1", true},
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{"Tailscale", "fd7a:115c:a1e0::1", false},
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{"Cloud Run", "fddf:3978:feb1:d745::1", true},
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{"zeros", "0::0", false},
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{"Link Local", "fe80::1", false},
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{"Global", "2602::1", true},
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{"IPv4 public", "192.0.2.1", false},
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{"IPv4 private", "192.168.1.1", false},
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}
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for _, test := range tests {
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if got := isUsableV6(netip.MustParseAddr(test.ip)); got != test.want {
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t.Errorf("isUsableV6(%s) = %v, want %v", test.name, got, test.want)
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}
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}
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}
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func TestStateString(t *testing.T) {
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tests := []struct {
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name string
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s *State
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want string
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}{
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{
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name: "typical_linux",
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s: &State{
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DefaultRouteInterface: "eth0",
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Interface: map[string]Interface{
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"eth0": {
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Interface: &net.Interface{
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Flags: net.FlagUp,
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},
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},
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"wlan0": {
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Interface: &net.Interface{},
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},
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"lo": {
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Interface: &net.Interface{},
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},
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},
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InterfaceIPs: map[string][]netip.Prefix{
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"eth0": {
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netip.MustParsePrefix("10.0.0.2/8"),
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},
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"lo": {},
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},
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HaveV4: true,
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},
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want: `interfaces.State{defaultRoute=eth0 ifs={eth0:[10.0.0.2/8]} v4=true v6=false}`,
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},
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{
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name: "default_desc",
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s: &State{
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DefaultRouteInterface: "foo",
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Interface: map[string]Interface{
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"foo": {
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Desc: "a foo thing",
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Interface: &net.Interface{
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Flags: net.FlagUp,
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},
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},
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},
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},
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want: `interfaces.State{defaultRoute=foo (a foo thing) ifs={foo:[]} v4=false v6=false}`,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := tt.s.String()
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if got != tt.want {
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t.Errorf("wrong\n got: %s\nwant: %s\n", got, tt.want)
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}
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})
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}
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}
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func TestIsInterestingIP(t *testing.T) {
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tests := []struct {
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ip string
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want bool
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}{
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{"fd7a:115c:a1e0:ab12:4843:cd96:624a:4603", true}, // Tailscale private ULA
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{"fd15:bbfa:c583:4fce:f4fb:4ff:fe1a:4148", true}, // Other private ULA
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{"10.2.3.4", true},
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{"127.0.0.1", false},
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{"::1", false},
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{"2001::2", true},
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{"169.254.1.2", false},
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{"fe80::1", false},
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}
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for _, tt := range tests {
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if got := isInterestingIP(netip.MustParseAddr(tt.ip)); got != tt.want {
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t.Errorf("isInterestingIP(%q) = %v, want %v", tt.ip, got, tt.want)
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}
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}
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}
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// tests (*State).Equal
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func TestEqual(t *testing.T) {
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tests := []struct {
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name string
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s1, s2 *State
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want bool // implies !wantMajor
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}{
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{
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name: "eq_nil",
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want: true,
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},
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{
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name: "nil_mix",
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s2: new(State),
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want: false,
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},
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{
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name: "eq",
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s1: &State{
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DefaultRouteInterface: "foo",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.2/16")},
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},
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},
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s2: &State{
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DefaultRouteInterface: "foo",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.2/16")},
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},
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},
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want: true,
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},
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{
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name: "default-route-changed",
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s1: &State{
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DefaultRouteInterface: "foo",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.2/16")},
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},
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},
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s2: &State{
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DefaultRouteInterface: "bar",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.2/16")},
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},
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},
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want: false,
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},
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{
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name: "some-interface-ips-changed",
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s1: &State{
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DefaultRouteInterface: "foo",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.2/16")},
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},
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},
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s2: &State{
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DefaultRouteInterface: "foo",
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InterfaceIPs: map[string][]netip.Prefix{
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"foo": {netip.MustParsePrefix("10.0.1.3/16")},
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},
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},
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want: false,
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},
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{
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name: "altaddrs-changed",
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s1: &State{
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Interface: map[string]Interface{
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"foo": {AltAddrs: []net.Addr{&net.TCPAddr{IP: net.ParseIP("1.2.3.4")}}},
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},
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},
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s2: &State{
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Interface: map[string]Interface{
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"foo": {AltAddrs: []net.Addr{&net.TCPAddr{IP: net.ParseIP("5.6.7.8")}}},
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},
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},
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want: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := tt.s2.Equal(tt.s1); got != tt.want {
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t.Errorf("Equal = %v; want %v", got, tt.want)
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}
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})
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}
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}
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