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Resolve hexadecimal notation for IPv4 addresses

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e.g. `7f000001.sslip.io` → 127.0.0.1

This came about as a result of the nip.io migration to sslip.io servers:
nip.io supported hexadecimal notation; sslip.io didn't. Several nip.io
users were blindsided by the feature's lack, and raised an issue.

- The hexadecimal-notated IPv4 must be exactly 8 hexadecimal characters,
  no separators.
- Any hexadecimal notation _must_ be bookended by dots or by the
  beginning or end of the string (www.0a09091e.sslip.io or
  0a09091e.sslip.io). No dashes.
- If a normal IP notation and a hex notation are in the same hostname,
  then the normal IP notation takes precedence. This preserves existing
  behavior for sslip.io users, e.g. (0a09091e.127-0-0-1.sslip.io
  resolves to 127.0.0.1, not 10.9.9.30)

[#92]
This commit is contained in:
Brian Cunnie
2025-06-21 13:10:17 -07:00
parent 23ec422620
commit 03eb55555d
3 changed files with 63 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
integration_flags_test.go
View File

@@ -136,6 +136,22 @@ var _ = Describe("flags", func() {
Eventually(digSession, 1).Should(Exit(0))
Eventually(string(serverSession.Err.Contents())).Should(MatchRegexp(`\? nil, SOA 8-8-8-8\.sslip\.io\. briancunnie\.gmail\.com\.`))
})
It("doesn't resolve public IPv4 addresses (hexadecimal)", func() {
digArgs := "@localhost 08080808.sslip.io -p " + strconv.Itoa(port)
digCmd := exec.Command("dig", strings.Split(digArgs, " ")...)
digSession, err := Start(digCmd, GinkgoWriter, GinkgoWriter)
Expect(err).ToNot(HaveOccurred())
Eventually(digSession, 1).Should(Exit(0))
Eventually(string(serverSession.Err.Contents())).Should(MatchRegexp(`\? nil, SOA 08080808\.sslip\.io\. briancunnie\.gmail\.com\.`))
})
It("resolves private IPv4 addresses (hexadecimal)", func() {
digArgs := "@localhost 7f000001.sslip.io -p " + strconv.Itoa(port)
digCmd := exec.Command("dig", strings.Split(digArgs, " ")...)
digSession, err := Start(digCmd, GinkgoWriter, GinkgoWriter)
Expect(err).ToNot(HaveOccurred())
Eventually(digSession, 1).Should(Exit(0))
Eventually(string(serverSession.Err.Contents())).Should(MatchRegexp(`TypeA 7f000001.sslip.io. \? 127.0.0.1`))
})
It("doesn't resolve public IPv6 addresses", func() {
digArgs := "@localhost aaaa 2600--.sslip.io -p " + strconv.Itoa(port)
digCmd := exec.Command("dig", strings.Split(digArgs, " ")...)