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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)
st2, err := GetState()
if err != nil {
t.Fatal(err)
}
if !st.EqualFiltered(st2, UseAllInterfaces, UseAllIPs) {
// let's assume nobody was changing the system network interfaces between
// the two GetState calls.
t.Fatal("two States back-to-back were not equal")
}
t.Logf("As string:\n\t%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, bool) {
return netip.MustParseAddr("192.168.7.1"), 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")
}
})
}
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", "0000:0000:0000:0000:0000:0000:0000:0000", 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 TestStateEqualFilteredIPFilter(t *testing.T) {
// s1 and s2 are identical, except that an "interesting" interface
// has gained an "uninteresting" IP address.
s1 := &State{
InterfaceIPs: map[string][]netip.Prefix{"x": {
netip.MustParsePrefix("42.0.0.0/8"),
netip.MustParsePrefix("169.254.0.0/16"), // link local unicast
}},
Interface: map[string]Interface{"x": {Interface: &net.Interface{Name: "x"}}},
}
s2 := &State{
InterfaceIPs: map[string][]netip.Prefix{"x": {
netip.MustParsePrefix("42.0.0.0/8"),
netip.MustParsePrefix("169.254.0.0/16"), // link local unicast
netip.MustParsePrefix("127.0.0.0/8"), // loopback (added)
}},
Interface: map[string]Interface{"x": {Interface: &net.Interface{Name: "x"}}},
}
// s1 and s2 are different...
if s1.EqualFiltered(s2, UseAllInterfaces, UseAllIPs) {
t.Errorf("%+v != %+v", s1, s2)
}
// ...and they look different if you only restrict to interesting interfaces...
if s1.EqualFiltered(s2, UseInterestingInterfaces, UseAllIPs) {
t.Errorf("%+v != %+v when restricting to interesting interfaces _but not_ IPs", s1, s2)
}
// ...but because the additional IP address is uninteresting, we should treat them as the same.
if !s1.EqualFiltered(s2, UseInterestingInterfaces, UseInterestingIPs) {
t.Errorf("%+v == %+v when restricting to interesting interfaces and IPs", s1, s2)
}
}
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{},
},
},
InterfaceIPs: map[string][]netip.Prefix{
"eth0": {
netip.MustParsePrefix("10.0.0.2/8"),
},
},
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",
},
},
},
want: `interfaces.State{defaultRoute=foo (a foo thing) ifs={} 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)
}
})
}
}
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