func (a *GenRandomAction) Run(s *State) error {
if a.Length == 0 {
a.Length = 16
}
data := interpolate(s, a.Data)
if data == "" {
switch a.Encoding {
case "", "hex":
data = random.Hex(a.Length)
case "base64":
data = base64.StdEncoding.EncodeToString(random.Bytes(a.Length))
case "base64safe":
data = random.Base64(a.Length)
case "uuid":
data = random.UUID()
default:
return fmt.Errorf("bootstrap: unknown random type: %q", a.Encoding)
}
}
s.StepData[a.ID] = &RandomData{Data: data}
if a.ControllerKey {
s.SetControllerKey(data)
}
return nil
}
func (b *azureBackend) Put(tx *postgres.DBTx, info FileInfo, r io.Reader, appendBlob bool) error {
if appendBlob {
// TODO(titanous): This is a hack, we should modify the block list.
existing, err := b.Open(tx, info, false)
if err != nil {
return err
}
r = io.MultiReader(existing, r)
}
info.ExternalID = random.UUID()
if err := tx.Exec("UPDATE files SET external_id = $2 WHERE file_id = $1", info.ID, info.ExternalID); err != nil {
return err
}
// Create blob that will be filled with blocks
if err := b.client.CreateBlockBlob(b.container, info.ExternalID); err != nil {
return err
}
var blocks []storage.Block
// Create blocks
buf := make([]byte, azureMaxBlockSize)
for {
n, err := io.ReadFull(r, buf)
if err == io.EOF {
break
}
if err != nil && err != io.ErrUnexpectedEOF {
return err
}
data := buf[:n]
md5sum := md5.Sum(data)
blockID := base64.StdEncoding.EncodeToString(random.Bytes(16))
if err := b.client.PutBlockWithLength(
b.container,
info.ExternalID,
blockID,
uint64(n),
bytes.NewReader(data),
map[string]string{"Content-MD5": base64.StdEncoding.EncodeToString(md5sum[:])},
); err != nil {
return err
}
blocks = append(blocks, storage.Block{ID: blockID, Status: storage.BlockStatusUncommitted})
if err == io.ErrUnexpectedEOF {
break
}
}
// Save the list of blocks to the blob
return b.client.PutBlockList(b.container, info.ExternalID, blocks)
}
func createBridge(name, network, natIface string) (*Bridge, error) {
ipAddr, ipNet, err := net.ParseCIDR(network)
if err != nil {
return nil, err
}
if err := netlink.CreateBridge(name, true); err != nil {
return nil, err
}
iface, err := net.InterfaceByName(name)
if err != nil {
return nil, err
}
// We need to explicitly assign the MAC address to avoid it changing to a lower value
// See: https://github.com/flynn/flynn/issues/223
b := random.Bytes(5)
mac := fmt.Sprintf("fe:%02x:%02x:%02x:%02x:%02x", b[0], b[1], b[2], b[3], b[4])
if err := netlink.NetworkSetMacAddress(iface, mac); err != nil {
return nil, err
}
if err := netlink.NetworkLinkAddIp(iface, ipAddr, ipNet); err != nil {
return nil, err
}
if err := netlink.NetworkLinkUp(iface); err != nil {
return nil, err
}
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte("1\n"), 0644); err != nil {
return nil, err
}
if err := setupIPTables(name, natIface); err != nil {
return nil, err
}
bridge := &Bridge{
name: name,
iface: iface,
ipAddr: ipAddr,
ipNet: ipNet,
alloc: ipallocator.New(),
}
bridge.alloc.RequestIP(ipNet, ipAddr)
return bridge, nil
}
func (i *Instance) Start() error {
i.writeInterfaceConfig()
macRand := random.Bytes(3)
macaddr := fmt.Sprintf("52:54:00:%02x:%02x:%02x", macRand[0], macRand[1], macRand[2])
i.Args = append(i.Args,
"-enable-kvm",
"-kernel", i.Kernel,
"-append", `"root=/dev/sda"`,
"-netdev", "tap,id=vmnic,ifname="+i.tap.Name+",script=no,downscript=no",
"-device", "virtio-net,netdev=vmnic,mac="+macaddr,
"-virtfs", "fsdriver=local,path="+i.netFS+",security_model=passthrough,readonly,mount_tag=netfs",
"-virtfs", "fsdriver=local,path="+i.BackupsDir+",security_model=passthrough,readonly,mount_tag=backupsfs",
"-nographic",
)
if i.Memory != "" {
i.Args = append(i.Args, "-m", i.Memory)
}
if i.Cores > 0 {
i.Args = append(i.Args, "-smp", strconv.Itoa(i.Cores))
}
for n, d := range i.Drives {
if d.COW {
fs, err := i.createCOW(d.FS, d.Temp)
if err != nil {
i.cleanup()
return err
}
d.FS = fs
}
i.Args = append(i.Args, fmt.Sprintf("-%s", n), d.FS)
}
i.cmd = exec.Command("sudo", append([]string{"-u", fmt.Sprintf("#%d", i.User), "-g", fmt.Sprintf("#%d", i.Group), "-H", "/usr/bin/qemu-system-x86_64"}, i.Args...)...)
i.cmd.Stdout = i.Out
i.cmd.Stderr = i.Out
var err error
if err = i.cmd.Start(); err != nil {
i.cleanup()
}
return err
}
func (v *vm) Start() error {
v.writeInterfaceConfig()
macRand := random.Bytes(3)
macaddr := fmt.Sprintf("52:54:00:%02x:%02x:%02x", macRand[0], macRand[1], macRand[2])
v.Args = append(v.Args,
"-enable-kvm",
"-kernel", v.Kernel,
"-append", `"root=/dev/sda"`,
"-net", "nic,macaddr="+macaddr,
"-net", "tap,ifname="+v.tap.Name+",script=no,downscript=no",
"-virtfs", "fsdriver=local,path="+v.netFS+",security_model=passthrough,readonly,mount_tag=netfs",
"-nographic",
)
if v.Memory != "" {
v.Args = append(v.Args, "-m", v.Memory)
}
if v.Cores > 0 {
v.Args = append(v.Args, "-smp", strconv.Itoa(v.Cores))
}
var err error
for i, d := range v.Drives {
if d.COW {
fs, err := v.createCOW(d.FS, d.Temp)
if err != nil {
v.cleanup()
return err
}
d.FS = fs
}
v.Args = append(v.Args, fmt.Sprintf("-%s", i), d.FS)
}
v.cmd = exec.Command("sudo", append([]string{"-u", fmt.Sprintf("#%d", v.User), "-g", fmt.Sprintf("#%d", v.Group), "-H", "/usr/bin/qemu-system-x86_64"}, v.Args...)...)
v.cmd.Stdout = v.Out
v.cmd.Stderr = v.Out
if err = v.cmd.Start(); err != nil {
v.cleanup()
}
return err
}
func (s *SchedulerSuite) TestTCPApp(t *c.C) {
app, _ := s.createApp(t)
stream, err := s.controllerClient(t).StreamJobEvents(app.ID, 0)
t.Assert(err, c.IsNil)
defer stream.Close()
t.Assert(flynn(t, "/", "-a", app.Name, "scale", "echoer=1"), Succeeds)
newRoute := flynn(t, "/", "-a", app.Name, "route", "add", "tcp", "-s", "echo-service")
t.Assert(newRoute, Succeeds)
t.Assert(newRoute.Output, Matches, `.+ on port \d+`)
str := strings.Split(strings.TrimSpace(string(newRoute.Output)), " ")
port := str[len(str)-1]
waitForJobEvents(t, stream.Events, jobEvents{"echoer": {"up": 1}})
// use Attempts to give the processes time to start
if err := Attempts.Run(func() error {
servAddr := routerIP + ":" + port
conn, err := net.Dial("tcp", servAddr)
if err != nil {
return err
}
defer conn.Close()
echo := random.Bytes(16)
_, err = conn.Write(echo)
if err != nil {
return err
}
reply := make([]byte, 16)
_, err = conn.Read(reply)
if err != nil {
return err
}
t.Assert(reply, c.DeepEquals, echo)
return nil
}); err != nil {
t.Fatal(err)
}
}
// ConfigureNetworking is called once during host startup and passed the
// strategy and identifier of the networking coordinatior job. Currently the
// only strategy implemented uses flannel.
func (l *LibvirtLXCBackend) ConfigureNetworking(config *host.NetworkConfig) error {
var err error
l.bridgeAddr, l.bridgeNet, err = net.ParseCIDR(config.Subnet)
if err != nil {
return err
}
l.ipalloc.RequestIP(l.bridgeNet, l.bridgeAddr)
err = netlink.CreateBridge(bridgeName, false)
bridgeExists := os.IsExist(err)
if err != nil && !bridgeExists {
return err
}
bridge, err := net.InterfaceByName(bridgeName)
if err != nil {
return err
}
if !bridgeExists {
// We need to explicitly assign the MAC address to avoid it changing to a lower value
// See: https://github.com/flynn/flynn/issues/223
b := random.Bytes(5)
bridgeMAC := fmt.Sprintf("fe:%02x:%02x:%02x:%02x:%02x", b[0], b[1], b[2], b[3], b[4])
if err := netlink.NetworkSetMacAddress(bridge, bridgeMAC); err != nil {
return err
}
}
currAddrs, err := bridge.Addrs()
if err != nil {
return err
}
setIP := true
for _, addr := range currAddrs {
ip, net, _ := net.ParseCIDR(addr.String())
if ip.Equal(l.bridgeAddr) && net.String() == l.bridgeNet.String() {
setIP = false
} else {
if err := netlink.NetworkLinkDelIp(bridge, ip, net); err != nil {
return err
}
}
}
if setIP {
if err := netlink.NetworkLinkAddIp(bridge, l.bridgeAddr, l.bridgeNet); err != nil {
return err
}
}
if err := netlink.NetworkLinkUp(bridge); err != nil {
return err
}
network, err := l.libvirt.LookupNetworkByName(libvirtNetName)
if err != nil {
// network doesn't exist
networkConfig := <.Network{
Name: libvirtNetName,
Bridge: lt.Bridge{Name: bridgeName},
Forward: lt.Forward{Mode: "bridge"},
}
network, err = l.libvirt.NetworkDefineXML(string(networkConfig.XML()))
if err != nil {
return err
}
}
active, err := network.IsActive()
if err != nil {
return err
}
if !active {
if err := network.Create(); err != nil {
return err
}
}
if defaultNet, err := l.libvirt.LookupNetworkByName("default"); err == nil {
// The default network causes dnsmasq to run and bind to all interfaces,
// including ours. This prevents discoverd from binding its DNS server.
// We don't use it, so destroy it if it exists.
defaultNet.Destroy()
}
// enable IP forwarding
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte("1\n"), 0644); err != nil {
return err
}
// Set up iptables for outbound traffic masquerading from containers to the
// rest of the network.
if err := iptables.EnableOutboundNAT(bridgeName, l.bridgeNet.String()); err != nil {
return err
}
// Read DNS config, discoverd uses the nameservers
dnsConf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if err != nil {
return err
}
config.Resolvers = dnsConf.Servers
// Write a resolv.conf to be bind-mounted into containers pointing at the
// future discoverd DNS listener
if err := os.MkdirAll("/etc/flynn", 0755); err != nil {
return err
}
var resolvSearch string
if len(dnsConf.Search) > 0 {
resolvSearch = fmt.Sprintf("search %s\n", strings.Join(dnsConf.Search, " "))
}
if err := ioutil.WriteFile("/etc/flynn/resolv.conf", []byte(fmt.Sprintf("%snameserver %s\n", resolvSearch, l.bridgeAddr.String())), 0644); err != nil {
return err
}
l.resolvConf = "/etc/flynn/resolv.conf"
// Allocate IPs for running jobs
for i, container := range l.containers {
if !container.job.Config.HostNetwork {
var err error
l.containers[i].IP, err = l.ipalloc.RequestIP(l.bridgeNet, container.IP)
if err != nil {
grohl.Log(grohl.Data{"fn": "ConfigureNetworking", "at": "request_ip", "status": "error", "err": err})
}
}
}
close(l.networkConfigured)
return nil
}
// ConfigureNetworking is called once during host startup and sets up the local
// bridge and forwarding rules for containers.
func (l *LibcontainerBackend) ConfigureNetworking(config *host.NetworkConfig) error {
log := l.logger.New("fn", "ConfigureNetworking")
var err error
l.bridgeAddr, l.bridgeNet, err = net.ParseCIDR(config.Subnet)
if err != nil {
return err
}
l.ipalloc.RequestIP(l.bridgeNet, l.bridgeAddr)
err = netlink.CreateBridge(l.bridgeName, false)
bridgeExists := os.IsExist(err)
if err != nil && !bridgeExists {
return err
}
bridge, err := net.InterfaceByName(l.bridgeName)
if err != nil {
return err
}
if !bridgeExists {
// We need to explicitly assign the MAC address to avoid it changing to a lower value
// See: https://github.com/flynn/flynn/issues/223
b := random.Bytes(5)
bridgeMAC := fmt.Sprintf("fe:%02x:%02x:%02x:%02x:%02x", b[0], b[1], b[2], b[3], b[4])
if err := netlink.NetworkSetMacAddress(bridge, bridgeMAC); err != nil {
return err
}
}
currAddrs, err := bridge.Addrs()
if err != nil {
return err
}
setIP := true
for _, addr := range currAddrs {
ip, net, _ := net.ParseCIDR(addr.String())
if ip.Equal(l.bridgeAddr) && net.String() == l.bridgeNet.String() {
setIP = false
} else {
if err := netlink.NetworkLinkDelIp(bridge, ip, net); err != nil {
return err
}
}
}
if setIP {
if err := netlink.NetworkLinkAddIp(bridge, l.bridgeAddr, l.bridgeNet); err != nil {
return err
}
}
if err := netlink.NetworkLinkUp(bridge); err != nil {
return err
}
// enable IP forwarding
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte("1\n"), 0644); err != nil {
return err
}
// Set up iptables for outbound traffic masquerading from containers to the
// rest of the network.
if err := iptables.EnableOutboundNAT(l.bridgeName, l.bridgeNet.String()); err != nil {
return err
}
// Read DNS config, discoverd uses the nameservers
dnsConf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if err != nil {
return err
}
config.Resolvers = dnsConf.Servers
// Write a resolv.conf to be bind-mounted into containers pointing at the
// future discoverd DNS listener
if err := os.MkdirAll("/etc/flynn", 0755); err != nil {
return err
}
var resolvSearch string
if len(dnsConf.Search) > 0 {
resolvSearch = fmt.Sprintf("search %s\n", strings.Join(dnsConf.Search, " "))
}
if err := ioutil.WriteFile("/etc/flynn/resolv.conf", []byte(fmt.Sprintf("%snameserver %s\n", resolvSearch, l.bridgeAddr.String())), 0644); err != nil {
return err
}
l.resolvConf = "/etc/flynn/resolv.conf"
// Allocate IPs for running jobs
l.containersMtx.Lock()
defer l.containersMtx.Unlock()
for _, container := range l.containers {
if !container.job.Config.HostNetwork {
if _, err := l.ipalloc.RequestIP(l.bridgeNet, container.IP); err != nil {
log.Error("error requesting ip", "job.id", container.job.ID, "err", err)
}
}
}
close(l.networkConfigured)
return nil
}
func (S) TestNonPatterns(c *C) {
const sep = " "
var input bytes.Buffer
key := genPublicKey(c)
keyBytes := bytes.TrimRight(bytes.TrimSpace(ssh.MarshalAuthorizedKey(key)), "\n")
// format: host key
host1Addr := "101.102.103.72"
input.WriteString(host1Addr)
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: host key
host2Addr := "test.example.com"
input.WriteString(host2Addr)
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: @flag [host]:port key
host3Addr := "3.example.com"
host3Port := "2222"
input.WriteString("@revoked")
input.WriteString(sep)
input.WriteString("[" + host3Addr + "]:" + host3Port)
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: host,host,host key
host4Addr := "4.example.com"
host5Addr := "102.101.72.100"
host6Addr := "6.example.com"
input.WriteString(strings.Join([]string{host4Addr, host5Addr, host6Addr}, ","))
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: host,[host]:port,host key
host7Addr := "7.example.com"
host8Addr := "102.101.72.100"
host8Port := "2223"
host9Addr := "9.example.com"
input.WriteString(strings.Join([]string{host7Addr, "[" + host8Addr + "]:" + host8Port, host9Addr}, ","))
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: @flag host,host key
host10Addr := "10.example.com"
host11Addr := "11.example.com"
input.WriteString("@revoked")
input.WriteString(sep)
input.WriteString(strings.Join([]string{host10Addr, host11Addr}, ","))
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
// format: hashed
host12Addr := "12.example.com"
host12Salt := random.Bytes(16)
host12SaltEncoded := base64.StdEncoding.EncodeToString(host12Salt)
host12Mac := hmac.New(sha1.New, host12Salt)
host12Mac.Write([]byte(host12Addr))
host12MacEncoded := base64.StdEncoding.EncodeToString(host12Mac.Sum(nil))
input.WriteString("|1|" + host12SaltEncoded + "|" + host12MacEncoded)
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
k, err := Unmarshal(bytes.NewReader(input.Bytes()))
c.Assert(err, IsNil)
// Test HostKeyCallback
addr := &net.TCPAddr{
Port: 22,
}
c.Assert(k.HostKeyCallback(host1Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host2Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host3Addr+":2222", &net.TCPAddr{Port: 2222}, key), Equals, HostRevokedError)
c.Assert(k.HostKeyCallback(host4Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host5Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host6Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host7Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host8Addr+":2223", &net.TCPAddr{Port: 2223}, key), IsNil)
c.Assert(k.HostKeyCallback(host9Addr+":22", addr, key), IsNil)
c.Assert(k.HostKeyCallback(host10Addr+":22", addr, key), Equals, HostRevokedError)
c.Assert(k.HostKeyCallback(host11Addr+":22", addr, key), Equals, HostRevokedError)
c.Assert(k.HostKeyCallback("notfound.example.com:22", addr, key), Equals, HostNotFoundError)
c.Assert(k.HostKeyCallback(host3Addr+":2223", &net.TCPAddr{Port: 2223}, key), Equals, HostNotFoundError)
c.Assert(k.HostKeyCallback(host1Addr+":2222", &net.TCPAddr{Port: 2222}, key), Equals, HostNotFoundError)
c.Assert(k.HostKeyCallback(host12Addr+":22", addr, key), IsNil) // hash match
// Make sure output is the same as input
var output bytes.Buffer
c.Assert(k.Marshal(&output), IsNil)
c.Assert(output.String(), Equals, input.String())
// Test AppendHost with Writer
var output2 bytes.Buffer
var input2 bytes.Buffer
c.Assert(k.AppendHost("new1.example.com:2223", key, &output2), IsNil)
input2.WriteString("[new1.example.com]:2223")
input2.WriteString(sep)
input2.Write(keyBytes)
input2.WriteString("\n")
input.Write(input2.Bytes())
c.Assert(output2.String(), Equals, input2.String())
// Test AppendHost without Writer
c.Assert(k.AppendHost("new2.example.com:22", key, nil), IsNil)
input.WriteString("new2.example.com")
input.WriteString(sep)
input.Write(keyBytes)
input.WriteString("\n")
output.Reset()
c.Assert(k.Marshal(&output), IsNil)
c.Assert(output.String(), Equals, input.String())
}
func NewLibvirtLXCBackend(state *State, portAlloc map[string]*ports.Allocator, volPath, logPath, initPath string) (Backend, error) {
libvirtc, err := libvirt.NewVirConnection("lxc:///")
if err != nil {
return nil, err
}
pinkertonCtx, err := pinkerton.BuildContext("aufs", "/var/lib/docker")
if err != nil {
return nil, err
}
if err := writeResolvConf("/etc/flynn/resolv.conf"); err != nil {
return nil, fmt.Errorf("Could not create resolv.conf: %s", err)
}
b := random.Bytes(5)
bridgeMAC := fmt.Sprintf("fe:%02x:%02x:%02x:%02x:%02x", b[0], b[1], b[2], b[3], b[4])
network, err := libvirtc.LookupNetworkByName(libvirtNetName)
if err != nil {
n := <.Network{
Name: libvirtNetName,
Bridge: lt.Bridge{Name: bridgeName, STP: "off"},
IP: lt.IP{Address: bridgeAddr.String(), Netmask: bridgeMask},
MAC: lt.MAC{Address: bridgeMAC},
}
network, err = libvirtc.NetworkDefineXML(string(n.XML()))
if err != nil {
return nil, err
}
}
active, err := network.IsActive()
if err != nil {
return nil, err
}
if !active {
if err := network.Create(); err != nil {
return nil, err
}
}
// We need to explicitly assign the MAC address to avoid it changing to a lower value
// See: https://github.com/flynn/flynn/issues/223
if err := netlink.NetworkSetMacAddress(bridgeName, bridgeMAC); err != nil {
return nil, err
}
iptables.RemoveExistingChain("FLYNN", bridgeName)
chain, err := iptables.NewChain("FLYNN", bridgeName)
if err != nil {
return nil, err
}
if err := ioutil.WriteFile("/proc/sys/net/ipv4/conf/"+bridgeName+"/route_localnet", []byte("1"), 0666); err != nil {
return nil, err
}
return &LibvirtLXCBackend{
LogPath: logPath,
VolPath: volPath,
InitPath: initPath,
libvirt: libvirtc,
state: state,
ports: portAlloc,
pinkerton: pinkertonCtx,
forwarder: ports.NewForwarder(net.ParseIP("0.0.0.0"), chain),
logs: make(map[string]*logbuf.Log),
containers: make(map[string]*libvirtContainer),
}, nil
}
func (s *SchedulerSuite) TestTCPApp(t *c.C) {
r, err := s.client.GetAppRelease("gitreceive")
t.Assert(err, c.IsNil)
imageID := r.Processes["app"].Env["SLUGRUNNER_IMAGE_ID"]
app := &ct.App{}
t.Assert(s.client.CreateApp(app), c.IsNil)
artifact := &ct.Artifact{Type: "docker", URI: "https://registry.hub.docker.com/flynn/slugrunner?id=" + imageID}
t.Assert(s.client.CreateArtifact(artifact), c.IsNil)
release := &ct.Release{
ArtifactID: artifact.ID,
Processes: map[string]ct.ProcessType{
"echo": {
Ports: []ct.Port{{Proto: "tcp"}},
Cmd: []string{"sdutil exec -s echo-service:$PORT socat -v tcp-l:$PORT,fork exec:/bin/cat"},
Entrypoint: []string{"sh", "-c"},
},
},
}
t.Assert(s.client.CreateRelease(release), c.IsNil)
t.Assert(s.client.SetAppRelease(app.ID, release.ID), c.IsNil)
stream, err := s.client.StreamJobEvents(app.ID)
defer stream.Close()
if err != nil {
t.Error(err)
}
t.Assert(flynn("/", "-a", app.Name, "scale", "echo=1"), Succeeds)
newRoute := flynn("/", "-a", app.Name, "route", "add", "tcp", "-s", "echo-service")
t.Assert(newRoute, Succeeds)
t.Assert(newRoute.Output, Matches, `.+ on port \d+`)
str := strings.Split(strings.TrimSpace(string(newRoute.Output)), " ")
port := str[len(str)-1]
waitForJobEvents(t, stream.Events, map[string]int{"echo": 1})
// use Attempts to give the processes time to start
if err := Attempts.Run(func() error {
servAddr := routerIP + ":" + port
conn, err := net.Dial("tcp", servAddr)
defer conn.Close()
if err != nil {
return err
}
echo := random.Bytes(16)
_, err = conn.Write(echo)
if err != nil {
return err
}
reply := make([]byte, 16)
_, err = conn.Read(reply)
if err != nil {
return err
}
t.Assert(reply, c.DeepEquals, echo)
return nil
}); err != nil {
t.Error(err)
}
}