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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package udprelay
import (
"bytes"
"net"
"net/netip"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"go4.org/mem"
"tailscale.com/disco"
"tailscale.com/net/packet"
"tailscale.com/types/key"
)
type testClient struct {
vni uint32
local key.DiscoPrivate
server key.DiscoPublic
uc *net.UDPConn
}
func newTestClient(t *testing.T, vni uint32, serverEndpoint netip.AddrPort, local key.DiscoPrivate, server key.DiscoPublic) *testClient {
rAddr := &net.UDPAddr{IP: serverEndpoint.Addr().AsSlice(), Port: int(serverEndpoint.Port())}
uc, err := net.DialUDP("udp4", nil, rAddr)
if err != nil {
t.Fatal(err)
}
return &testClient{
vni: vni,
local: local,
server: server,
uc: uc,
}
}
func (c *testClient) write(t *testing.T, b []byte) {
_, err := c.uc.Write(b)
if err != nil {
t.Fatal(err)
}
}
func (c *testClient) read(t *testing.T) []byte {
c.uc.SetReadDeadline(time.Now().Add(time.Second))
b := make([]byte, 1<<16-1)
n, err := c.uc.Read(b)
if err != nil {
t.Fatal(err)
}
return b[:n]
}
func (c *testClient) writeDataPkt(t *testing.T, b []byte) {
pkt := make([]byte, packet.GeneveFixedHeaderLength, packet.GeneveFixedHeaderLength+len(b))
gh := packet.GeneveHeader{Control: false, VNI: c.vni, Protocol: packet.GeneveProtocolWireGuard}
err := gh.Encode(pkt)
if err != nil {
t.Fatal(err)
}
pkt = append(pkt, b...)
c.write(t, pkt)
}
func (c *testClient) readDataPkt(t *testing.T) []byte {
b := c.read(t)
gh := packet.GeneveHeader{}
err := gh.Decode(b)
if err != nil {
t.Fatal(err)
}
if gh.Protocol != packet.GeneveProtocolWireGuard {
t.Fatal("unexpected geneve protocol")
}
if gh.Control {
t.Fatal("unexpected control")
}
if gh.VNI != c.vni {
t.Fatal("unexpected vni")
}
return b[packet.GeneveFixedHeaderLength:]
}
func (c *testClient) writeControlDiscoMsg(t *testing.T, msg disco.Message) {
pkt := make([]byte, packet.GeneveFixedHeaderLength, 512)
gh := packet.GeneveHeader{Control: true, VNI: c.vni, Protocol: packet.GeneveProtocolDisco}
err := gh.Encode(pkt)
if err != nil {
t.Fatal(err)
}
pkt = append(pkt, disco.Magic...)
pkt = c.local.Public().AppendTo(pkt)
box := c.local.Shared(c.server).Seal(msg.AppendMarshal(nil))
pkt = append(pkt, box...)
c.write(t, pkt)
}
func (c *testClient) readControlDiscoMsg(t *testing.T) disco.Message {
b := c.read(t)
gh := packet.GeneveHeader{}
err := gh.Decode(b)
if err != nil {
t.Fatal(err)
}
if gh.Protocol != packet.GeneveProtocolDisco {
t.Fatal("unexpected geneve protocol")
}
if !gh.Control {
t.Fatal("unexpected non-control")
}
if gh.VNI != c.vni {
t.Fatal("unexpected vni")
}
b = b[packet.GeneveFixedHeaderLength:]
headerLen := len(disco.Magic) + key.DiscoPublicRawLen
if len(b) < headerLen {
t.Fatal("disco message too short")
}
sender := key.DiscoPublicFromRaw32(mem.B(b[len(disco.Magic):headerLen]))
if sender.Compare(c.server) != 0 {
t.Fatal("unknown disco public key")
}
payload, ok := c.local.Shared(c.server).Open(b[headerLen:])
if !ok {
t.Fatal("failed to open sealed disco msg")
}
msg, err := disco.Parse(payload)
if err != nil {
t.Fatal("failed to parse disco payload")
}
return msg
}
func (c *testClient) handshake(t *testing.T) {
c.writeControlDiscoMsg(t, &disco.BindUDPRelayEndpoint{})
msg := c.readControlDiscoMsg(t)
challenge, ok := msg.(*disco.BindUDPRelayEndpointChallenge)
if !ok {
t.Fatal("unexepcted disco message type")
}
c.writeControlDiscoMsg(t, &disco.BindUDPRelayEndpointAnswer{Answer: challenge.Challenge})
}
func (c *testClient) close() {
c.uc.Close()
}
func TestServer(t *testing.T) {
discoA := key.NewDisco()
discoB := key.NewDisco()
ipv4LoopbackAddr := netip.MustParseAddr("127.0.0.1")
server, _, err := NewServer(t.Logf, 0, []netip.Addr{ipv4LoopbackAddr})
if err != nil {
t.Fatal(err)
}
defer server.Close()
endpoint, err := server.AllocateEndpoint(discoA.Public(), discoB.Public())
if err != nil {
t.Fatal(err)
}
dupEndpoint, err := server.AllocateEndpoint(discoA.Public(), discoB.Public())
if err != nil {
t.Fatal(err)
}
// We expect the same endpoint details pre-handshake.
if diff := cmp.Diff(dupEndpoint, endpoint, cmpopts.EquateComparable(netip.AddrPort{}, key.DiscoPublic{})); diff != "" {
t.Fatalf("wrong dupEndpoint (-got +want)\n%s", diff)
}
if len(endpoint.AddrPorts) != 1 {
t.Fatalf("unexpected endpoint.AddrPorts: %v", endpoint.AddrPorts)
}
tcA := newTestClient(t, endpoint.VNI, endpoint.AddrPorts[0], discoA, endpoint.ServerDisco)
defer tcA.close()
tcB := newTestClient(t, endpoint.VNI, endpoint.AddrPorts[0], discoB, endpoint.ServerDisco)
defer tcB.close()
tcA.handshake(t)
tcB.handshake(t)
dupEndpoint, err = server.AllocateEndpoint(discoA.Public(), discoB.Public())
if err != nil {
t.Fatal(err)
}
// We expect the same endpoint details post-handshake.
if diff := cmp.Diff(dupEndpoint, endpoint, cmpopts.EquateComparable(netip.AddrPort{}, key.DiscoPublic{})); diff != "" {
t.Fatalf("wrong dupEndpoint (-got +want)\n%s", diff)
}
txToB := []byte{1, 2, 3}
tcA.writeDataPkt(t, txToB)
rxFromA := tcB.readDataPkt(t)
if !bytes.Equal(txToB, rxFromA) {
t.Fatal("unexpected msg A->B")
}
txToA := []byte{4, 5, 6}
tcB.writeDataPkt(t, txToA)
rxFromB := tcA.readDataPkt(t)
if !bytes.Equal(txToA, rxFromB) {
t.Fatal("unexpected msg B->A")
}
}
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