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IPv6 PTR (ip6.arpa)

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We implement PTR records for IPv6, for example:

2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa →
2601-646-100-69f0-14ce-6eea-9204-bba2.sslip.io.
This commit is contained in:
Brian Cunnie
2022-07-11 20:57:55 -07:00
parent db763e071c
commit dc53bbccc8
2 changed files with 42 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/sslip.io-dns-server/integration_test.go
View File

@@ -189,6 +189,22 @@ var _ = Describe("sslip.io-dns-server", func() {
"@127.0.0.1 0.0.127.in-addr.arpa ptr +short",
`\A\z`,
`TypePTR 0.0.127.in-addr.arpa. \? nil, SOA sslip.io. briancunnie.gmail.com. 2022042500 900 900 1800 180\n$`),
Entry(`get a PTR for 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa returns 2601-646-100-69f0-14ce-6eea-9204-bba2.sslip.io`,
"@127.0.0.1 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa ptr +short",
`\A2601-646-100-69f0-14ce-6eea-9204-bba2.sslip.io.\n\z`,
`TypePTR 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa. \? 2601-646-100-69f0-14ce-6eea-9204-bba2.sslip.io.`),
Entry(`get a PTR for 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.blah.ip6.arpa returns no records`,
"@127.0.0.1 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.blah.ip6.arpa ptr +short",
`\A\z`,
`TypePTR 2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.blah.ip6.arpa. \? nil, SOA sslip.io. briancunnie.gmail.com. 2022042500 900 900 1800 180\n$`),
Entry(`get a PTR for b2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa returns no records`,
"@127.0.0.1 b2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa ptr +short",
`\A\z`,
`TypePTR b2.a.b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa. \? nil, SOA sslip.io. briancunnie.gmail.com. 2022042500 900 900 1800 180\n$`),
Entry(`get a PTR for b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa returns no records`,
"@127.0.0.1 b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa ptr +short",
`\A\z`,
`TypePTR b.b.4.0.2.9.a.e.e.6.e.c.4.1.0.f.9.6.0.0.1.0.6.4.6.0.1.0.6.2.ip6.arpa. \? nil, SOA sslip.io. briancunnie.gmail.com. 2022042500 900 900 1800 180\n$`),
)
})
Describe("for more complex assertions", func() {

26
src/sslip.io-dns-server/xip/xip.go
View File

@@ -95,6 +95,7 @@ var (
// https://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses
ipv6RE = regexp.MustCompile(`(^|[.-])(([0-9a-fA-F]{1,4}-){7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}-){1,7}-|([0-9a-fA-F]{1,4}-){1,6}-[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}-){1,5}(-[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}-){1,4}(-[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}-){1,3}(-[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}-){1,2}(-[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}-((-[0-9a-fA-F]{1,4}){1,6})|-((-[0-9a-fA-F]{1,4}){1,7}|-)|fe80-(-[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]+|--(ffff(-0{1,4})?-)?((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9])|([0-9a-fA-F]{1,4}-){1,4}-((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9]))($|[.-])`)
ipv4ReverseRE = regexp.MustCompile(`^(.*)\.in-addr\.arpa\.$`)
ipv6ReverseRE = regexp.MustCompile(`^(([0-9a-f]\.){32})ip6\.arpa\.`)
dns01ChallengeRE = regexp.MustCompile(`(?i)_acme-challenge\.`) // (?i) → non-capturing case insensitive
kvRE = regexp.MustCompile(`\.k-v\.io\.$`)
nsAwsSslip, _ = dnsmessage.NewName("ns-aws.sslip.io.")
@@ -861,6 +862,31 @@ func PTRResource(fqdn []byte) *dnsmessage.PTRResource {
PTR: ptrName,
}
}
if ipv6ReverseRE.Match(fqdn) {
b := ipv6ReverseRE.FindSubmatch(fqdn)[1]
fmt.Println(string(b))
reversed := []byte{
b[62], b[60], b[58], b[56], ':',
b[54], b[52], b[50], b[48], ':',
b[46], b[44], b[42], b[40], ':',
b[38], b[36], b[34], b[32], ':',
b[30], b[28], b[26], b[24], ':',
b[22], b[20], b[18], b[16], ':',
b[14], b[12], b[10], b[8], ':',
b[6], b[4], b[2], b[0],
}
ip := net.ParseIP(string(reversed)).To16()
if ip == nil {
return nil
}
ptrName, err := dnsmessage.NewName(strings.ReplaceAll(ip.String(), ":", "-") + ".sslip.io.")
if err != nil {
return nil
}
return &dnsmessage.PTRResource{
PTR: ptrName,
}
}
return nil
}