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edns_test.go
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edns_test.go
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package main
import (
"bytes"
"encoding/hex"
"testing"
"github.com/miekg/dns"
"github.com/markdingo/autoreverse/mock"
)
func TestFindNSID(t *testing.T) {
query := setQuestion(dns.ClassINET, dns.TypeA, "localhost.")
o := new(dns.OPT)
o.Hdr.Name = "."
o.Hdr.Rrtype = dns.TypeOPT
e := new(dns.EDNS0_NSID)
o.Option = append(o.Option, e)
query.Extra = append(query.Extra, o)
req := newRequest(query, nil, "udp")
req.opt = o
nsid := req.findNSID()
if nsid == nil {
t.Error("Failed to find NSID opt")
}
}
func TestGenOpt(t *testing.T) {
query := setQuestion(dns.ClassINET, dns.TypeA, "localhost.")
req := newRequest(query, nil, "udp")
o := req.genOpt()
if o != nil {
t.Error("Did not expect an OPT with no settings")
}
req.maxSize = 800
req.nsidOut = "abcd"
cCookie, _ := hex.DecodeString("0123456789abcdef")
sCookie, _ := hex.DecodeString("abcdef0123456789")
req.cookieOut = cCookie
req.cookieOut = append(req.cookieOut, sCookie...)
o = req.genOpt()
if o == nil {
t.Fatal("Expected an OPT")
}
req.opt = o
mz := req.opt.UDPSize()
if mz != 800 {
t.Error("UDPSize did not make it to OPT", mz)
}
e := req.findNSID()
if e == nil {
t.Error("Expected to find NSID sub-opt")
} else {
nsid := e.Nsid
if nsid != "abcd" {
t.Error("NSID mismatch. Exp: abcd, Got:", nsid)
}
}
req.findCookies()
if !req.cookiesPresent {
t.Error("Cookies should be present")
}
if bytes.Compare(req.clientCookie, cCookie) != 0 {
t.Errorf("Client cookie did not transfer %x", req.clientCookie)
}
if bytes.Compare(req.serverCookie, sCookie) != 0 {
t.Errorf("Server cookie did not transfer %x", req.serverCookie)
}
}
func TestGenV1Cookie(t *testing.T) {
ip := "0.0.0.0:53"
var secrets [2]uint64
var clock uint32
var cCookie [8]byte
got := genV1Cookie(secrets, clock, ip, cCookie[:])
expect, _ := hex.DecodeString("000000000000000001000000000000009cfc753b7275ad7f")
if bytes.Compare(got, expect[:]) != 0 {
t.Errorf("Zero-value cookie wrong. Expected: %x Got %x\n", expect, got)
}
clock++
got = genV1Cookie(secrets, clock, ip, cCookie[:])
if bytes.Compare(got, expect[:]) == 0 {
t.Errorf("Clock-tick cookie should have changed")
}
clock = 0
secrets[0] = 1
got = genV1Cookie(secrets, clock, ip, cCookie[:])
if bytes.Compare(got, expect[:]) == 0 {
t.Errorf("New secrets cookie should have changed")
}
secrets[0] = 0
ip = "0.0.0.1:53"
got = genV1Cookie(secrets, clock, ip, cCookie[:])
if bytes.Compare(got, expect[:]) == 0 {
t.Errorf("New IP cookie should have changed")
}
ip = "0.0.0.0:53"
cCookie[0] = 1
got = genV1Cookie(secrets, clock, ip, cCookie[:])
if bytes.Compare(got, expect[:]) == 0 {
t.Errorf("New cCookie cookie should have changed")
}
cCookie[0] = 0
}
func TestValidateOrGenerate(t *testing.T) {
testCases := []struct {
ipv4 bool
client, server string
unixTime int64
valid bool
output string
}{
{true, "0123456789abcdef", "", 0x2000, false, // No sCookie
"0123456789abcdef010000000000200078f6dcfbf17e8504"},
{true, "0123456789abcdef", "010000000000200078f6dcfbf17e8504", 0x2000, true,
"0123456789abcdef010000000000200078f6dcfbf17e8504"}, // Correct sCookie
// TS is within range, but is GT reissue gap so a new cookie is expected
{true, "0123456789abcdef", "010000000000200078f6dcfbf17e8504",
0x2000 + maxBehindGap - 1, true,
"0123456789abcdef0100000000002e0f2ef2835de77f0e45"},
// TS is too old, should fail and get a new cookie
{true, "0123456789abcdef", "010000000000200078f6dcfbf17e8504",
0x2000 + maxBehindGap + 1, false,
"0123456789abcdef0100000000002e113c19eb1777e9d7e0"},
{true, "0123456789abcdef", "0200000000001000e99b04f5b59e5343", 0x2000, false, // Version
"0123456789abcdef010000000000200078f6dcfbf17e8504"},
{true, "0123456789abcdef", "0101000000001000e99b04f5b59e5343", 0x2000, false, // RFFU
"0123456789abcdef010000000000200078f6dcfbf17e8504"},
// IPV6
{false, "0123456789abcdef", "", 0x2000, false, // No sCookie
"0123456789abcdef010000000000200091992114bd52a849"},
{false, "0123456789abcdef", "010000000000200091992114bd52a849", 0x2000, true,
"0123456789abcdef010000000000200091992114bd52a849"}, // Correct sCookie
}
var secrets [2]uint64
for ix, tc := range testCases {
query := setQuestion(dns.ClassCHAOS, dns.TypeTXT, "version.bind.")
var ip string
if tc.ipv4 {
ip = "127.0.0.1:53"
} else {
ip = "[::1]:4051"
}
src := mock.NewNetAddr("udp", ip)
req := newRequest(query, src, "udp")
req.clientCookie, _ = hex.DecodeString(tc.client)
req.serverCookie, _ = hex.DecodeString(tc.server)
req.validateOrGenerateCookie(secrets, tc.unixTime)
if req.cookieValid != tc.valid {
t.Error("Err", ix, "Valid mismatch. Expected", tc.valid)
}
if len(tc.output) > 0 { // Is output expected?
exp, _ := hex.DecodeString(tc.output)
if bytes.Compare(exp, req.cookieOut) != 0 {
t.Errorf("Err %d cookieOut mismatch. Got %x. Exp %s\n",
ix, req.cookieOut, tc.output)
}
}
}
}
func TestNormalizeTimestamps(t *testing.T) {
testCases := []struct {
ourClock, theirClock uint32
oursGreater bool
}{
{0x10, 0x2, true}, // Regular values - no wrap
{0x80000001, 0x2, true}, // ours-theirs is one shy of wrapDistance
{0x80000007, 0x7, false}, // ours-theirs equals wrapDistance
{0x7, 0x80000007, false}, // The undefined cases mentioned in in rfc1982
{0x80000102, 0x100, true}, // ours-theirs > wrapDistance
{0x2, 0x80000001, false}, // Test bottom half of conditional
{0x100, 0x80000102, false},
{0x100, 0x80000102, false},
}
for ix, tc := range testCases {
ourClock64, theirClock64 := normalizeTimestamps(tc.ourClock, tc.theirClock)
if tc.oursGreater {
if ourClock64 <= theirClock64 {
t.Error(ix, ourClock64, "Not Greater", theirClock64)
}
} else {
if ourClock64 > theirClock64 {
t.Error(ix, ourClock64, "Is Greater", theirClock64)
}
}
}
}
// 82 ns/op on a mac m1, so pretty fast
func BenchmarkGenV1Cookie(b *testing.B) {
ip := "0.0.0.0:53"
var secrets [2]uint64
var clock uint32
var cCookie [8]byte
for i := 0; i < b.N; i++ {
genV1Cookie(secrets, clock, ip, cCookie[:])
}
}