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Test when it can't bind to INADDR_ANY

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This commit is contained in:
Brian Cunnie
2023-09-25 10:52:47 -07:00
parent 81b142925f
commit 5e81d41637
1 changed files with 27 additions and 0 deletions
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27
src/sslip.io-dns-server/integration_test.go
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@@ -394,6 +394,33 @@ var _ = Describe("sslip.io-dns-server", func() {
Expect(secondServerSession.ExitCode()).To(Equal(1))
})
})
Describe("When it can't bind to a port on loopback", func() {
var udpConnSquatter *net.UDPConn
BeforeEach(func() {
port = getFreePort()
// the following won't work on an IPv6-only machine; change to "::1" in that case
udpAddr := net.UDPAddr{
IP: net.ParseIP("::1"),
Port: port,
}
udpConnSquatter, err = net.ListenUDP("udp", &udpAddr)
Expect(err).ToNot(HaveOccurred())
})
It("prints an informative message and continues", func() {
Expect(err).ToNot(HaveOccurred())
secondServerCmd := exec.Command(serverPath, "-port", strconv.Itoa(port), "-blocklistURL", "file://../../etc/blocklist.txt")
secondServerSession, err := Start(secondServerCmd, GinkgoWriter, GinkgoWriter)
Expect(err).ToNot(HaveOccurred())
Eventually(secondServerSession.Err, 10).Should(Say(` version \d+\.\d+\.\d+ starting`))
Eventually(secondServerSession.Err, 10).Should(Say(`I couldn't bind via UDP to "\[::\]:\d+" \(INADDR_ANY, all interfaces\), so I'll try to bind to each address individually.`))
Eventually(secondServerSession.Err, 10).Should(Say(`I couldn't bind via UDP to the following IPs:.* "::1"`))
err = udpConnSquatter.Close()
Expect(err).ToNot(HaveOccurred())
Eventually(secondServerSession.Err, 10).Should(Say("Ready to answer queries"))
secondServerSession.Terminate()
Eventually(secondServerSession).Should(Exit())
})
})
})
var listenPort = 1023 // lowest unprivileged port - 1 (immediately incremented)