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tailscale/net/interfaces/interfaces_test.go
Andrew Dunham 226486eb9a net/interfaces: handle removed interfaces in State.Equal 
This wasn't previously handling the case where an interface in s2 was
removed and not present in s1, and would cause the Equal method to
incorrectly return that the states were equal.

Updates tailscale/corp#19124

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I3af22bc631015d1ddd0a1d01bfdf312161b9532d
2024-04-17 10:34:40 -04:00

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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package interfaces
import (
"encoding/json"
"net"
"net/netip"
"testing"
"tailscale.com/tstest"
)
func TestGetState(t *testing.T) {
st, err := GetState()
if err != nil {
t.Fatal(err)
}
j, err := json.MarshalIndent(st, "", "\t")
if err != nil {
t.Errorf("JSON: %v", err)
}
t.Logf("Got: %s", j)
t.Logf("As string: %s", st)
}
func TestLikelyHomeRouterIP(t *testing.T) {
ipnet := func(s string) net.Addr {
ip, ipnet, err := net.ParseCIDR(s)
ipnet.IP = ip
if err != nil {
t.Fatal(err)
}
return ipnet
}
mockInterfaces := []Interface{
// Interface that's not running
{
Interface: &net.Interface{
Index: 1,
MTU: 1500,
Name: "down0",
Flags: net.FlagBroadcast | net.FlagMulticast,
},
AltAddrs: []net.Addr{
ipnet("10.0.0.100/8"),
},
},
// Interface that's up, but only has an IPv6 address
{
Interface: &net.Interface{
Index: 2,
MTU: 1500,
Name: "ipsixonly0",
Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
},
AltAddrs: []net.Addr{
ipnet("76f9:2e7d:55dd:48e1:48d0:763a:b591:b1bc/64"),
},
},
// Fake interface with a gateway to the internet
{
Interface: &net.Interface{
Index: 3,
MTU: 1500,
Name: "fake0",
Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
},
AltAddrs: []net.Addr{
ipnet("23a1:99c9:3a88:1d29:74d4:957b:2133:3f4e/64"),
ipnet("192.168.7.100/24"),
},
},
}
// Mock out the responses from netInterfaces()
tstest.Replace(t, &altNetInterfaces, func() ([]Interface, error) {
return mockInterfaces, nil
})
// Mock out the likelyHomeRouterIP to return a known gateway.
tstest.Replace(t, &likelyHomeRouterIP, func() (netip.Addr, netip.Addr, bool) {
return netip.MustParseAddr("192.168.7.1"), netip.Addr{}, true
})
gw, my, ok := LikelyHomeRouterIP()
if !ok {
t.Fatal("expected success")
}
t.Logf("myIP = %v; gw = %v", my, gw)
if want := netip.MustParseAddr("192.168.7.1"); gw != want {
t.Errorf("got gateway %v; want %v", gw, want)
}
if want := netip.MustParseAddr("192.168.7.100"); my != want {
t.Errorf("got self IP %v; want %v", my, want)
}
// Verify that no IP is returned if there are no IPv4 addresses on
// local interfaces.
t.Run("NoIPv4Addrs", func(t *testing.T) {
tstest.Replace(t, &mockInterfaces, []Interface{
// Interface that's up, but only has an IPv6 address
{
Interface: &net.Interface{
Index: 2,
MTU: 1500,
Name: "en0",
Flags: net.FlagUp | net.FlagBroadcast | net.FlagMulticast | net.FlagRunning,
},
AltAddrs: []net.Addr{
ipnet("76f9:2e7d:55dd:48e1:48d0:763a:b591:b1bc/64"),
},
},
})
_, _, ok := LikelyHomeRouterIP()
if ok {
t.Fatal("expected no success")
}
})
}
// https://github.com/tailscale/tailscale/issues/10466
func TestLikelyHomeRouterIP_Prefix(t *testing.T) {
ipnet := func(s string) net.Addr {
ip, ipnet, err := net.ParseCIDR(s)
ipnet.IP = ip
if err != nil {
t.Fatal(err)
}
return ipnet
}
mockInterfaces := []Interface{
// Valid and running interface that doesn't have a route to the
// internet, and comes before the interface that does.
{
Interface: &net.Interface{
Index: 1,
MTU: 1500,
Name: "docker0",
Flags: net.FlagUp |
net.FlagBroadcast |
net.FlagMulticast |
net.FlagRunning,
},
AltAddrs: []net.Addr{
ipnet("172.17.0.0/16"),
},
},
// Fake interface with a gateway to the internet.
{
Interface: &net.Interface{
Index: 2,
MTU: 1500,
Name: "fake0",
Flags: net.FlagUp |
net.FlagBroadcast |
net.FlagMulticast |
net.FlagRunning,
},
AltAddrs: []net.Addr{
ipnet("192.168.7.100/24"),
},
},
}
// Mock out the responses from netInterfaces()
tstest.Replace(t, &altNetInterfaces, func() ([]Interface, error) {
return mockInterfaces, nil
})
// Mock out the likelyHomeRouterIP to return a known gateway.
tstest.Replace(t, &likelyHomeRouterIP, func() (netip.Addr, netip.Addr, bool) {
return netip.MustParseAddr("192.168.7.1"), netip.Addr{}, true
})
gw, my, ok := LikelyHomeRouterIP()
if !ok {
t.Fatal("expected success")
}
t.Logf("myIP = %v; gw = %v", my, gw)
if want := netip.MustParseAddr("192.168.7.1"); gw != want {
t.Errorf("got gateway %v; want %v", gw, want)
}
if want := netip.MustParseAddr("192.168.7.100"); my != want {
t.Errorf("got self IP %v; want %v", my, want)
}
}
func TestLikelyHomeRouterIP_NoMocks(t *testing.T) {
// Verify that this works properly when called on a real live system,
// without any mocks.
gw, my, ok := LikelyHomeRouterIP()
t.Logf("LikelyHomeRouterIP: gw=%v my=%v ok=%v", gw, my, ok)
}
func TestIsUsableV6(t *testing.T) {
tests := []struct {
name string
ip string
want bool
}{
{"first ULA", "fc00::1", true},
{"Tailscale", "fd7a:115c:a1e0::1", false},
{"Cloud Run", "fddf:3978:feb1:d745::1", true},
{"zeros", "0::0", false},
{"Link Local", "fe80::1", false},
{"Global", "2602::1", true},
{"IPv4 public", "192.0.2.1", false},
{"IPv4 private", "192.168.1.1", false},
}
for _, test := range tests {
if got := isUsableV6(netip.MustParseAddr(test.ip)); got != test.want {
t.Errorf("isUsableV6(%s) = %v, want %v", test.name, got, test.want)
}
}
}
func TestStateString(t *testing.T) {
tests := []struct {
name string
s *State
want string
}{
{
name: "typical_linux",
s: &State{
DefaultRouteInterface: "eth0",
Interface: map[string]Interface{
"eth0": {
Interface: &net.Interface{
Flags: net.FlagUp,
},
},
"wlan0": {
Interface: &net.Interface{},
},
"lo": {
Interface: &net.Interface{},
},
},
InterfaceIPs: map[string][]netip.Prefix{
"eth0": {
netip.MustParsePrefix("10.0.0.2/8"),
},
"lo": {},
},
HaveV4: true,
},
want: `interfaces.State{defaultRoute=eth0 ifs={eth0:[10.0.0.2/8]} v4=true v6=false}`,
},
{
name: "default_desc",
s: &State{
DefaultRouteInterface: "foo",
Interface: map[string]Interface{
"foo": {
Desc: "a foo thing",
Interface: &net.Interface{
Flags: net.FlagUp,
},
},
},
},
want: `interfaces.State{defaultRoute=foo (a foo thing) ifs={foo:[]} v4=false v6=false}`,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := tt.s.String()
if got != tt.want {
t.Errorf("wrong\n got: %s\nwant: %s\n", got, tt.want)
}
})
}
}
// tests (*State).Equal
func TestEqual(t *testing.T) {
pfxs := func(addrs ...string) (ret []netip.Prefix) {
for _, addr := range addrs {
ret = append(ret, netip.MustParsePrefix(addr))
}
return ret
}
tests := []struct {
name string
s1, s2 *State
want bool // implies !wantMajor
}{
{
name: "eq_nil",
want: true,
},
{
name: "nil_mix",
s2: new(State),
want: false,
},
{
name: "eq",
s1: &State{
DefaultRouteInterface: "foo",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.2/16")},
},
},
s2: &State{
DefaultRouteInterface: "foo",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.2/16")},
},
},
want: true,
},
{
name: "default-route-changed",
s1: &State{
DefaultRouteInterface: "foo",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.2/16")},
},
},
s2: &State{
DefaultRouteInterface: "bar",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.2/16")},
},
},
want: false,
},
{
name: "some-interface-ips-changed",
s1: &State{
DefaultRouteInterface: "foo",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.2/16")},
},
},
s2: &State{
DefaultRouteInterface: "foo",
InterfaceIPs: map[string][]netip.Prefix{
"foo": {netip.MustParsePrefix("10.0.1.3/16")},
},
},
want: false,
},
{
name: "altaddrs-changed",
s1: &State{
Interface: map[string]Interface{
"foo": {AltAddrs: []net.Addr{&net.TCPAddr{IP: net.ParseIP("1.2.3.4")}}},
},
},
s2: &State{
Interface: map[string]Interface{
"foo": {AltAddrs: []net.Addr{&net.TCPAddr{IP: net.ParseIP("5.6.7.8")}}},
},
},
want: false,
},
// See tailscale/corp#19124
{
name: "interface-removed",
s1: &State{
InterfaceIPs: map[string][]netip.Prefix{
"rmnet16": pfxs("2607:1111:2222:3333:4444:5555:6666:7777/64"),
"rmnet17": pfxs("2607:9999:8888:7777:666:5555:4444:3333/64"),
"tun0": pfxs("100.64.1.2/32", "fd7a:115c:a1e0::1/128"),
"v4-rmnet16": pfxs("192.0.0.4/32"),
"wlan0": pfxs("10.0.0.111/24"), // removed below
},
},
s2: &State{
InterfaceIPs: map[string][]netip.Prefix{
"rmnet16": pfxs("2607:1111:2222:3333:4444:5555:6666:7777/64"),
"rmnet17": pfxs("2607:9999:8888:7777:666:5555:4444:3333/64"),
"tun0": pfxs("100.64.1.2/32", "fd7a:115c:a1e0::1/128"),
"v4-rmnet16": pfxs("192.0.0.4/32"),
},
},
want: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.s2.Equal(tt.s1); got != tt.want {
t.Errorf("Equal = %v; want %v", got, tt.want)
}
})
}
}
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