94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
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package dnstt
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import (
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"encoding/base32"
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"testing"
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)
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func TestExtractQueryDecodesDNSTTClientID(t *testing.T) {
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clientID := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}
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encoded := base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(append(clientID, 0xaa, 0xbb))
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packet := dnsQuery(encoded, "tunnel.example.com")
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domain, gotClientID := ExtractQuery(packet, []string{"tunnel.example.com"})
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if domain != "tunnel.example.com" {
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t.Fatalf("domain = %q, want tunnel.example.com", domain)
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}
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if gotClientID != "0102030405060708" {
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t.Fatalf("client ID = %q, want 0102030405060708", gotClientID)
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}
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}
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func TestExtractQueryMatchesBareDomainWithoutClientID(t *testing.T) {
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packet := dnsQuery("", "tunnel.example.com")
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domain, gotClientID := ExtractQuery(packet, []string{"tunnel.example.com"})
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if domain != "tunnel.example.com" {
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t.Fatalf("domain = %q, want tunnel.example.com", domain)
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}
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if gotClientID != "" {
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t.Fatalf("client ID = %q, want empty", gotClientID)
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}
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}
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func TestExtractQueryIgnoresUnregisteredDomain(t *testing.T) {
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packet := dnsQuery("abcd", "other.example.com")
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domain, gotClientID := ExtractQuery(packet, []string{"tunnel.example.com"})
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if domain != "" || gotClientID != "" {
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t.Fatalf("got domain=%q clientID=%q, want both empty", domain, gotClientID)
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}
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}
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func TestExtractQueryReturnsDomainWhenPrefixIsNotClientID(t *testing.T) {
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packet := dnsQuery("not-base32-!", "tunnel.example.com")
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domain, gotClientID := ExtractQuery(packet, []string{"tunnel.example.com"})
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if domain != "tunnel.example.com" {
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t.Fatalf("domain = %q, want tunnel.example.com", domain)
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}
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if gotClientID != "" {
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t.Fatalf("client ID = %q, want empty", gotClientID)
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}
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}
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func dnsQuery(prefix string, domain string) []byte {
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packet := []byte{
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0x12, 0x34, // transaction ID
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0x01, 0x00, // flags
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0x00, 0x01, // questions
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0x00, 0x00, // answers
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0x00, 0x00, // authority
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0x00, 0x00, // additional
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}
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labels := splitDomain(domain)
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if prefix != "" {
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labels = append([]string{prefix}, labels...)
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}
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for _, label := range labels {
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packet = append(packet, byte(len(label)))
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packet = append(packet, label...)
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}
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packet = append(packet, 0x00) // root label
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packet = append(packet, 0x00, 0x10) // TXT
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packet = append(packet, 0x00, 0x01) // IN
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return packet
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}
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func splitDomain(domain string) []string {
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var labels []string
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start := 0
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for i := 0; i <= len(domain); i++ {
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if i == len(domain) || domain[i] == '.' {
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labels = append(labels, domain[start:i])
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start = i + 1
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}
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}
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return labels
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}
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