tailscale/derp/derp_test.go

126 lines
2.7 KiB
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package derp
import (
"bufio"
"crypto/rand"
"net"
"testing"
"time"
"golang.org/x/crypto/curve25519"
)
func TestSendRecv(t *testing.T) {
const numClients = 3
var serverPrivateKey [32]byte
if _, err := rand.Read(serverPrivateKey[:]); err != nil {
t.Fatal(err)
}
var clientPrivateKeys [][32]byte
for i := 0; i < numClients; i++ {
var key [32]byte
if _, err := rand.Read(key[:]); err != nil {
t.Fatal(err)
}
clientPrivateKeys = append(clientPrivateKeys, key)
}
var clientKeys [][32]byte
for _, privKey := range clientPrivateKeys {
var key [32]byte
curve25519.ScalarBaseMult(&key, &privKey)
clientKeys = append(clientKeys, key)
}
ln, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatal(err)
}
var clientConns []net.Conn
for i := 0; i < numClients; i++ {
conn, err := net.Dial("tcp", ln.Addr().String())
if err != nil {
t.Fatal(err)
}
clientConns = append(clientConns, conn)
}
s := NewServer(serverPrivateKey, t.Logf)
defer s.Close()
for i := 0; i < numClients; i++ {
netConn, err := ln.Accept()
if err != nil {
t.Fatal(err)
}
conn := bufio.NewReadWriter(bufio.NewReader(netConn), bufio.NewWriter(netConn))
go s.Accept(netConn, conn)
}
var clients []*Client
var recvChs []chan []byte
errCh := make(chan error, 3)
for i := 0; i < numClients; i++ {
key := clientPrivateKeys[i]
netConn := clientConns[i]
conn := bufio.NewReadWriter(bufio.NewReader(netConn), bufio.NewWriter(netConn))
c, err := NewClient(key, netConn, conn, t.Logf)
if err != nil {
t.Fatalf("client %d: %v", i, err)
}
clients = append(clients, c)
recvChs = append(recvChs, make(chan []byte))
go func(i int) {
for {
b := make([]byte, 1<<16)
n, err := c.Recv(b)
if err != nil {
errCh <- err
return
}
b = b[:n]
recvChs[i] <- b
}
}(i)
}
recv := func(i int, want string) {
t.Helper()
select {
case b := <-recvChs[i]:
if got := string(b); got != want {
t.Errorf("client1.Recv=%q, want %q", got, want)
}
case <-time.After(1 * time.Second):
t.Errorf("client%d.Recv, got nothing, want %q", i, want)
}
}
recvNothing := func(i int) {
t.Helper()
select {
case b := <-recvChs[0]:
t.Errorf("client%d.Recv=%q, want nothing", i, string(b))
default:
}
}
msg1 := []byte("hello 0->1\n")
if err := clients[0].Send(clientKeys[1], msg1); err != nil {
t.Fatal(err)
}
recv(1, string(msg1))
recvNothing(0)
recvNothing(2)
msg2 := []byte("hello 1->2\n")
if err := clients[1].Send(clientKeys[2], msg2); err != nil {
t.Fatal(err)
}
recv(2, string(msg2))
recvNothing(0)
recvNothing(1)
}