tailscale/net/netns/netns_test.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package netns contains the common code for using the Go net package
// in a logical "network namespace" to avoid routing loops where
// Tailscale-created packets would otherwise loop back through
// Tailscale routes.
//
// Despite the name netns, the exact mechanism used differs by
// operating system, and perhaps even by version of the OS.
//
// The netns package also handles connecting via SOCKS proxies when
// configured by the environment.
package netns
import (
"flag"
"testing"
)
var extNetwork = flag.Bool("use-external-network", false, "use the external network in tests")
func TestDial(t *testing.T) {
if !*extNetwork {
t.Skip("skipping test without --use-external-network")
}
d := NewDialer(t.Logf)
c, err := d.Dial("tcp", "google.com:80")
if err != nil {
t.Fatal(err)
}
defer c.Close()
t.Logf("got addr %v", c.RemoteAddr())
c, err = d.Dial("tcp4", "google.com:80")
if err != nil {
t.Fatal(err)
}
defer c.Close()
t.Logf("got addr %v", c.RemoteAddr())
}
func TestIsLocalhost(t *testing.T) {
tests := []struct {
name string
host string
want bool
}{
{"IPv4 loopback", "127.0.0.1", true},
{"IPv4 !loopback", "192.168.0.1", false},
{"IPv4 loopback with port", "127.0.0.1:1", true},
{"IPv4 !loopback with port", "192.168.0.1:1", false},
{"IPv4 unspecified", "0.0.0.0", false},
{"IPv4 unspecified with port", "0.0.0.0:1", false},
{"IPv6 loopback", "::1", true},
{"IPv6 !loopback", "2001:4860:4860::8888", false},
{"IPv6 loopback with port", "[::1]:1", true},
{"IPv6 !loopback with port", "[2001:4860:4860::8888]:1", false},
{"IPv6 unspecified", "::", false},
{"IPv6 unspecified with port", "[::]:1", false},
{"empty", "", false},
{"hostname", "example.com", false},
{"localhost", "localhost", true},
{"localhost6", "localhost6", true},
{"localhost with port", "localhost:1", true},
{"localhost6 with port", "localhost6:1", true},
{"ip6-localhost", "ip6-localhost", true},
{"ip6-localhost with port", "ip6-localhost:1", true},
{"ip6-loopback", "ip6-loopback", true},
{"ip6-loopback with port", "ip6-loopback:1", true},
}
for _, test := range tests {
if got := isLocalhost(test.host); got != test.want {
t.Errorf("isLocalhost(%q) = %v, want %v", test.name, got, test.want)
}
}
}