nip.io has full suite of nameservers

nip.io has the complete set of NS records that sslip.io has. Previously
all the nameservers had only sslip.io records, e.g. ns-ovh.sslip.io.
With this commit, we now duplicate the nameservers, so now there's an
ns-ovh.nip.io as well. This also includes the "wildcard" record,
ns.sslip.io.

This unlocks the ability to use the shorter "nip.io" domain for certain
lookups, e.g. "dig txt @ns.nip.io ip.nip.io", whereas previously I'd
have to do "dig txt @ns.sslip.io ..."

integration_test.go

@@ -228,6 +228,32 @@ var _ = Describe("sslip.io-dns-server", func() {
 				}
 			})
 		})
+		When("ns.nip.io is queried", func() {
+			It("returns all the A records", func() {
+				digArgs = "@localhost ns.nip.io +short -p " + strconv.Itoa(port)
+				digCmd = exec.Command("dig", strings.Split(digArgs, " ")...)
+				digSession, err = Start(digCmd, GinkgoWriter, GinkgoWriter)
+				Expect(err).ToNot(HaveOccurred())
+				Eventually(digSession).Should(Say(`146.190.110.69`))
+				Eventually(digSession).Should(Say(`104.155.144.4`))
+				Eventually(digSession).Should(Say(`5.78.115.44`))
+				Eventually(digSession).Should(Say(`51.75.53.19`))
+				Eventually(digSession, 1).Should(Exit(0))
+				Eventually(string(serverSession.Err.Contents())).Should(MatchRegexp(`TypeA ns.nip.io. \? 146.190.110.69, 104.155.144.4, 5.78.115.44, 51.75.53.19\n`))
+			})
+			It("returns all the AAAA records", func() {
+				digArgs = "@localhost aaaa ns.nip.io +short -p " + strconv.Itoa(port)
+				digCmd = exec.Command("dig", strings.Split(digArgs, " ")...)
+				digSession, err = Start(digCmd, GinkgoWriter, GinkgoWriter)
+				Expect(err).ToNot(HaveOccurred())
+				Eventually(digSession).Should(Say(`2400:6180:0:d2:0:1:da21:d000`))
+				Eventually(digSession).Should(Say(`2600:1900:4000:4d12::`))
+				Eventually(digSession).Should(Say(`2a01:4ff:1f0:c920::`))
+				Eventually(digSession).Should(Say(`2001:41d0:602:2313::1`))
+				Eventually(digSession, 1).Should(Exit(0))
+				Eventually(string(serverSession.Err.Contents())).Should(MatchRegexp(`TypeAAAA ns.nip.io. \? 2400:6180:0:d2:0:1:da21:d000, 2600:1900:4000:4d12::, 2a01:4ff:1f0:c920::, 2001:41d0:602:2313::1\n`))
+			})
+		})
 		When("ns.sslip.io is queried", func() {
 			It("returns all the A records", func() {
 				digArgs = "@localhost ns.sslip.io +short -p " + strconv.Itoa(port)

main.go

@@ -24,6 +24,14 @@ func main() {
 			"sslip.io=78.46.204.247,"+
 			"nip.io=2a01:4f8:c17:b8f::2,"+
 			"sslip.io=2a01:4f8:c17:b8f::2,"+
+			"ns.nip.io=146.190.110.69,"+
+			"ns.nip.io=2400:6180:0:d2:0:1:da21:d000,"+
+			"ns.nip.io=104.155.144.4,"+
+			"ns.nip.io=2600:1900:4000:4d12::,"+
+			"ns.nip.io=5.78.115.44,"+
+			"ns.nip.io=2a01:4ff:1f0:c920::,"+
+			"ns.nip.io=51.75.53.19,"+
+			"ns.nip.io=2001:41d0:602:2313::1,"+
 			"ns.sslip.io=146.190.110.69,"+
 			"ns.sslip.io=2400:6180:0:d2:0:1:da21:d000,"+
 			"ns.sslip.io=104.155.144.4,"+
@@ -34,6 +42,14 @@ func main() {
 			"ns.sslip.io=2001:41d0:602:2313::1,"+
 			"blocked.sslip.io=52.0.56.137,"+
 			"blocked.sslip.io=2600:1f18:aaf:6900::a,"+
+			"ns-do-sg.nip.io=146.190.110.69,"+
+			"ns-do-sg.nip.io=2400:6180:0:d2:0:1:da21:d000,"+
+			"ns-gce.nip.io=104.155.144.4,"+
+			"ns-gce.nip.io=2600:1900:4000:4d12::,"+
+			"ns-hetzner.nip.io=5.78.115.44,"+
+			"ns-hetzner.nip.io=2a01:4ff:1f0:c920::,"+
+			"ns-ovh.nip.io=51.75.53.19,"+
+			"ns-ovh.nip.io=2001:41d0:602:2313::1,"+
 			"ns-do-sg.sslip.io=146.190.110.69,"+
 			"ns-do-sg.sslip.io=2400:6180:0:d2:0:1:da21:d000,"+
 			"ns-gce.sslip.io=104.155.144.4,"+
@@ -41,11 +57,7 @@ func main() {
 			"ns-hetzner.sslip.io=5.78.115.44,"+
 			"ns-hetzner.sslip.io=2a01:4ff:1f0:c920::,"+
 			"ns-ovh.sslip.io=51.75.53.19,"+
-			"ns-ovh.sslip.io=2001:41d0:602:2313::1,"+
+			"ns-ovh.sslip.io=2001:41d0:602:2313::1,",
-			"ns1.nip.io=51.75.53.19,"+
-			"ns1.nip.io=2001:41d0:602:2313::1,"+
-			"ns2.nip.io=5.78.115.44,"+
-			"ns2.nip.io=2a01:4ff:1f0:c920::,",
 		"comma-separated list of hosts and corresponding IPv4 and/or IPv6 address(es). If you're running your own sslip.io nameservers, add their hostnames and addresses here. If unsure, add to the list rather than replace")
 	var delegates = flag.String("delegates", "", "comma-separated list of domains you own "+
 		"and nameservers you control to which to delegate, often used to acquire wildcard certificates from "+