tailscale/net/netns/netns_linux_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
import (
"fmt"
"go/ast"
"go/parser"
"go/token"
"testing"
)
// verifies tailscaleBypassMark is in sync with wgengine.
func TestBypassMarkInSync(t *testing.T) {
want := fmt.Sprintf("%q", fmt.Sprintf("0x%x", tailscaleBypassMark))
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "../../wgengine/router/router_linux.go", nil, 0)
if err != nil {
t.Fatal(err)
}
for _, decl := range f.Decls {
gd, ok := decl.(*ast.GenDecl)
if !ok || gd.Tok != token.CONST {
continue
}
for _, spec := range gd.Specs {
vs, ok := spec.(*ast.ValueSpec)
if !ok {
continue
}
for i, ident := range vs.Names {
if ident.Name != "tailscaleBypassMark" {
continue
}
valExpr := vs.Values[i]
lit, ok := valExpr.(*ast.BasicLit)
if !ok {
t.Errorf("tailscaleBypassMark = %T, expected *ast.BasicLit", valExpr)
}
if lit.Value == want {
// Pass.
return
}
t.Fatalf("router_linux.go's tailscaleBypassMark = %s; not in sync with netns's %s", lit.Value, want)
}
}
}
t.Errorf("tailscaleBypassMark not found in router_linux.go")
}
func TestSocketMarkWorks(t *testing.T) {
_ = socketMarkWorks()
// we cannot actually assert whether the test runner has SO_MARK available
// or not, as we don't know. We're just checking that it doesn't panic.
}