func TestListenAndServe(t *testing.T) {
t.Parallel()
t.Skip()
s, err := dnsp.NewServer(dnsp.Options{
Bind: ":0",
})
if err != nil {
t.Errorf("%T %#v", err, err)
t.Fatal(err)
}
done := make(chan struct{})
go func() {
if err := s.Shutdown(); err != nil {
t.Error(err)
}
done <- struct{}{}
}()
if err = s.ListenAndServe(); err != nil {
t.Fatal(err)
}
<-done // waint until the above goroutine finishes
}
func TestIsAllowedBlack(t *testing.T) {
t.Parallel()
tmp, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(tmp.Name())
tmp.Write([]byte("*.xxx\n"))
tmp.Write([]byte("*.sex\n"))
tmp.Write([]byte("doubleclick.net\n"))
tmp.Write([]byte("p**n.com\n"))
s, err := dnsp.NewServer(dnsp.Options{
Blacklist: tmp.Name(),
})
if err != nil {
t.Fatal(err)
}
for host, ok := range map[string]bool{
"bar.spam.xxx.": false,
"doubleclick.net.": false,
"example.com.": true,
"foo.sex.": false,
"github.com.": true,
"google.com.": true,
"p**n.com.": false,
} {
if act := s.IsAllowed(host); ok != act {
t.Errorf("expected s.IsAllowed(%q) to be %v, got %v", host, ok, act)
}
}
}
func TestIsAllowedWhite(t *testing.T) {
t.Parallel()
tmp, err := ioutil.TempFile("", "")
if err != nil {
t.Fatal(err)
}
defer os.Remove(tmp.Name())
tmp.Write([]byte("*.wikipedia.org\n"))
tmp.Write([]byte("github.com\n"))
tmp.Write([]byte("google.com\n"))
s, err := dnsp.NewServer(dnsp.Options{
Whitelist: tmp.Name(),
})
if err != nil {
t.Fatal(err)
}
for host, ok := range map[string]bool{
"blocked.net.": false,
"en.wikipedia.org.": true,
"example.com.": false,
"github.com.": true,
"google.com.": true,
"hu.wikipedia.org.": true,
"wikipedia.org": false,
} {
if act := s.IsAllowed(host); ok != act {
t.Errorf("expected s.IsAllowed(%q) to be %v, got %v", host, ok, act)
}
}
}
func TestInvalidOptions(t *testing.T) {
t.Parallel()
s, err := dnsp.NewServer(dnsp.Options{
Poll: -time.Second, // negative poll
})
if err == nil {
t.Error("expected an error, got nil")
}
if s != nil {
t.Errorf("expected nil, got %+v", s)
}
}
func Example() {
// Create a server that listens on :1053, on all interfaces.
// DNS queries will be proxied to Google's public nameservers.
s, err := dnsp.NewServer(dnsp.Options{
Bind: ":1053",
Resolve: []string{"8.8.4.4", "8.8.8.8"},
// Block hosts listed in a community-managed file:
Blacklist: "http://hosts-file.net/download/hosts.txt",
})
if err != nil {
log.Fatal(err)
}
// Remember to close it:
defer s.Shutdown()
// Start accepting DNS queries:
if err := s.ListenAndServe(); err != nil {
log.Fatal(err)
}
}
func main() {
app := cli.NewApp()
app.Name = "dnsp"
app.Usage = "DNS proxy with whitelist/blacklist support"
app.Version = "0.9.2"
app.Author, app.Email = "", ""
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "net, n",
Value: "udp",
Usage: "listen protocol (‘tcp’ or ‘udp’)",
EnvVar: "DNSP_NET",
},
cli.StringFlag{
Name: "listen, l",
Value: ":dns",
Usage: "listen address (host:port, host or :port)",
EnvVar: "DNSP_BIND",
},
cli.StringFlag{
Name: "resolve, r",
Value: DefaultResolve,
Usage: "comma-separated list of name servers (host:port or host)",
EnvVar: "DNSP_SERVER",
},
cli.StringFlag{
Name: "whitelist, w",
Usage: "URL or path to file containing whitelisted hosts",
EnvVar: "DNSP_WHITELIST",
},
cli.StringFlag{
Name: "blacklist, b",
Usage: "URL or path to file containing blacklisted hosts",
EnvVar: "DNSP_BLACKLIST",
},
cli.DurationFlag{
Name: "poll, p",
Usage: "poll the whitelist or blacklist for updates",
EnvVar: "DNSP_POLL",
},
cli.StringFlag{
Name: "http, t",
Usage: "start a web-based UI on the given address (host:port, host or port)",
EnvVar: "DNSP_HTTP",
},
}
app.Action = func(c *cli.Context) {
resolve := []string{}
if res := c.String("resolve"); res != "false" && res != "" {
resolve = strings.Split(res, ",")
}
o := &dnsp.Options{
Net: c.String("net"),
Bind: c.String("listen"),
Resolve: resolve,
Poll: c.Duration("poll"),
Whitelist: c.String("whitelist"),
Blacklist: c.String("blacklist"),
}
s, err := dnsp.NewServer(*o)
if err != nil {
log.Fatalf("dnsp: %s", err)
}
if bind := c.String("http"); bind != "" {
log.Printf("dnsp: starting web interface on %s", bind)
go dnsp.RunHTTPServer(bind, s)
}
catch(func(sig os.Signal) int {
os.Stderr.Write([]byte{'\r'})
log.Printf("dnsp: shutting down")
s.Shutdown()
return 0
}, syscall.SIGINT, syscall.SIGTERM)
defer s.Shutdown() // in case of normal exit
if len(o.Resolve) == 0 {
log.Printf("dnsp: listening on %s", o.Bind)
} else {
log.Printf("dnsp: listening on %s, proxying to %s", o.Bind, o.Resolve)
}
if err := s.ListenAndServe(); err != nil {
log.Fatalf("dnsp: %s", err)
}
}
app.Run(os.Args)
}