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https://github.com/tailscale/tailscale.git
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1896bf99d9
Connections to a control server or log server on localhost, used in a number of tests, are working right now because the calls to SO_MARK in netns fail for non-root but then we ignore the failure when running in tests. Unfortunately that failure in SO_MARK also affects container environments without CAP_NET_ADMIN, breaking Tailscale connectivity. We're about to fix netns to recognize when SO_MARK doesn't work and use SO_BINDTODEVICE instead. Doing so makes tests fail, as their sockets now BINDTODEVICE of the default route and cannot connect to localhost. Add support to skip namespacing for localhost connections, which Darwin and Windows already do. This is not conditional on running within a test, if you tell tailscaled to connect to localhost it will automatically use a non-namespaced socket to do so. Signed-off-by: Denton Gentry <dgentry@tailscale.com>
80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package netns contains the common code for using the Go net package
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// in a logical "network namespace" to avoid routing loops where
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// Tailscale-created packets would otherwise loop back through
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// Tailscale routes.
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//
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// Despite the name netns, the exact mechanism used differs by
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// operating system, and perhaps even by version of the OS.
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//
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// The netns package also handles connecting via SOCKS proxies when
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// configured by the environment.
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package netns
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import (
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"flag"
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"testing"
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)
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var extNetwork = flag.Bool("use-external-network", false, "use the external network in tests")
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func TestDial(t *testing.T) {
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if !*extNetwork {
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t.Skip("skipping test without --use-external-network")
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}
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d := NewDialer()
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c, err := d.Dial("tcp", "google.com:80")
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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t.Logf("got addr %v", c.RemoteAddr())
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c, err = d.Dial("tcp4", "google.com:80")
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if err != nil {
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t.Fatal(err)
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}
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defer c.Close()
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t.Logf("got addr %v", c.RemoteAddr())
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}
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func TestIsLocalhost(t *testing.T) {
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tests := []struct {
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name string
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host string
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want bool
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}{
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{"IPv4 loopback", "127.0.0.1", true},
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{"IPv4 !loopback", "192.168.0.1", false},
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{"IPv4 loopback with port", "127.0.0.1:1", true},
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{"IPv4 !loopback with port", "192.168.0.1:1", false},
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{"IPv4 unspecified", "0.0.0.0", false},
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{"IPv4 unspecified with port", "0.0.0.0:1", false},
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{"IPv6 loopback", "::1", true},
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{"IPv6 !loopback", "2001:4860:4860::8888", false},
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{"IPv6 loopback with port", "[::1]:1", true},
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{"IPv6 !loopback with port", "[2001:4860:4860::8888]:1", false},
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{"IPv6 unspecified", "::", false},
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{"IPv6 unspecified with port", "[::]:1", false},
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{"empty", "", false},
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{"hostname", "example.com", false},
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{"localhost", "localhost", true},
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{"localhost6", "localhost6", true},
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{"localhost with port", "localhost:1", true},
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{"localhost6 with port", "localhost6:1", true},
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{"ip6-localhost", "ip6-localhost", true},
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{"ip6-localhost with port", "ip6-localhost:1", true},
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{"ip6-loopback", "ip6-loopback", true},
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{"ip6-loopback with port", "ip6-loopback:1", true},
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}
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for _, test := range tests {
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if got := isLocalhost(test.host); got != test.want {
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t.Errorf("isLocalhost(%q) = %v, want %v", test.name, got, test.want)
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}
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}
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}
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