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tailscale/tstest/integration/vms/harness_test.go

244 lines
5.8 KiB
Go

// Copyright (c) 2021 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.
//go:build !windows
package vms
import (
"bytes"
"context"
"fmt"
"log"
"net"
"net/http"
"net/netip"
"os"
"os/exec"
"path"
"path/filepath"
"strconv"
"sync"
"testing"
"time"
"golang.org/x/crypto/ssh"
"golang.org/x/net/proxy"
"tailscale.com/tailcfg"
"tailscale.com/tstest/integration"
"tailscale.com/tstest/integration/testcontrol"
"tailscale.com/types/dnstype"
)
type Harness struct {
testerDialer proxy.Dialer
testerDir string
binaryDir string
cli string
daemon string
pubKey string
signer ssh.Signer
cs *testcontrol.Server
loginServerURL string
testerV4 netip.Addr
ipMu *sync.Mutex
ipMap map[string]ipMapping
}
func newHarness(t *testing.T) *Harness {
dir := t.TempDir()
bindHost := deriveBindhost(t)
ln, err := net.Listen("tcp", net.JoinHostPort(bindHost, "0"))
if err != nil {
t.Fatalf("can't make TCP listener: %v", err)
}
t.Cleanup(func() {
ln.Close()
})
t.Logf("host:port: %s", ln.Addr())
cs := &testcontrol.Server{
DNSConfig: &tailcfg.DNSConfig{
// TODO: this is wrong.
// It is also only one of many configurations.
// Figure out how to scale it up.
Resolvers: []*dnstype.Resolver{{Addr: "100.100.100.100"}, {Addr: "8.8.8.8"}},
Domains: []string{"record"},
Proxied: true,
ExtraRecords: []tailcfg.DNSRecord{{Name: "extratest.record", Type: "A", Value: "1.2.3.4"}},
},
}
derpMap := integration.RunDERPAndSTUN(t, t.Logf, bindHost)
cs.DERPMap = derpMap
var (
ipMu sync.Mutex
ipMap = map[string]ipMapping{}
)
mux := http.NewServeMux()
mux.Handle("/", cs)
lc := &integration.LogCatcher{}
if *verboseLogcatcher {
lc.UseLogf(t.Logf)
t.Cleanup(func() {
lc.UseLogf(nil) // do not log after test is complete
})
}
mux.Handle("/c/", lc)
// This handler will let the virtual machines tell the host information about that VM.
// This is used to maintain a list of port->IP address mappings that are known to be
// working. This allows later steps to connect over SSH. This returns no response to
// clients because no response is needed.
mux.HandleFunc("/myip/", func(w http.ResponseWriter, r *http.Request) {
ipMu.Lock()
defer ipMu.Unlock()
name := path.Base(r.URL.Path)
host, _, _ := net.SplitHostPort(r.RemoteAddr)
port, err := strconv.Atoi(name)
if err != nil {
log.Panicf("bad port: %v", port)
}
distro := r.UserAgent()
ipMap[distro] = ipMapping{distro, port, host}
t.Logf("%s: %v", name, host)
})
hs := &http.Server{Handler: mux}
go hs.Serve(ln)
cmd := exec.Command("ssh-keygen", "-t", "ed25519", "-f", "machinekey", "-N", "")
cmd.Dir = dir
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("ssh-keygen: %v, %s", err, out)
}
pubkey, err := os.ReadFile(filepath.Join(dir, "machinekey.pub"))
if err != nil {
t.Fatalf("can't read ssh key: %v", err)
}
privateKey, err := os.ReadFile(filepath.Join(dir, "machinekey"))
if err != nil {
t.Fatalf("can't read ssh private key: %v", err)
}
signer, err := ssh.ParsePrivateKey(privateKey)
if err != nil {
t.Fatalf("can't parse private key: %v", err)
}
loginServer := fmt.Sprintf("http://%s", ln.Addr())
t.Logf("loginServer: %s", loginServer)
h := &Harness{
pubKey: string(pubkey),
binaryDir: integration.BinaryDir(t),
cli: integration.TailscaleBinary(t),
daemon: integration.TailscaledBinary(t),
signer: signer,
loginServerURL: loginServer,
cs: cs,
ipMu: &ipMu,
ipMap: ipMap,
}
h.makeTestNode(t, loginServer)
return h
}
func (h *Harness) Tailscale(t *testing.T, args ...string) []byte {
t.Helper()
args = append([]string{"--socket=" + filepath.Join(h.testerDir, "sock")}, args...)
cmd := exec.Command(h.cli, args...)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatal(err)
}
return out
}
// makeTestNode creates a userspace tailscaled running in netstack mode that
// enables us to make connections to and from the tailscale network being
// tested. This mutates the Harness to allow tests to dial into the tailscale
// network as well as control the tester's tailscaled.
func (h *Harness) makeTestNode(t *testing.T, controlURL string) {
dir := t.TempDir()
h.testerDir = dir
port, err := getProbablyFreePortNumber()
if err != nil {
t.Fatalf("can't get free port: %v", err)
}
cmd := exec.Command(
h.daemon,
"--tun=userspace-networking",
"--state="+filepath.Join(dir, "state.json"),
"--socket="+filepath.Join(dir, "sock"),
fmt.Sprintf("--socks5-server=localhost:%d", port),
)
cmd.Env = append(
os.Environ(),
"NOTIFY_SOCKET="+filepath.Join(dir, "notify_socket"),
"TS_LOG_TARGET="+h.loginServerURL,
)
err = cmd.Start()
if err != nil {
t.Fatalf("can't start tailscaled: %v", err)
}
t.Cleanup(func() {
cmd.Process.Kill()
})
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
ticker := time.NewTicker(100 * time.Millisecond)
outer:
for {
select {
case <-ctx.Done():
t.Fatal("timed out waiting for tailscaled to come up")
return
case <-ticker.C:
conn, err := net.Dial("unix", filepath.Join(dir, "sock"))
if err != nil {
continue
}
conn.Close()
break outer
}
}
run(t, dir, h.cli,
"--socket="+filepath.Join(dir, "sock"),
"up",
"--login-server="+controlURL,
"--hostname=tester",
)
dialer, err := proxy.SOCKS5("tcp", net.JoinHostPort("127.0.0.1", fmt.Sprint(port)), nil, &net.Dialer{})
if err != nil {
t.Fatalf("can't make netstack proxy dialer: %v", err)
}
h.testerDialer = dialer
h.testerV4 = bytes2Netaddr(h.Tailscale(t, "ip", "-4"))
}
func bytes2Netaddr(inp []byte) netip.Addr {
return netip.MustParseAddr(string(bytes.TrimSpace(inp)))
}