// Copyright (c) Tailscale Inc & AUTHORS // SPDX-License-Identifier: BSD-3-Clause // 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) } } }