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package async
import (
"context"
"net"
"testing"
"time"
"github.com/insomniacslk/dhcp/dhcpv6"
"github.com/insomniacslk/dhcp/dhcpv6/client6"
"github.com/insomniacslk/dhcp/iana"
"github.com/stretchr/testify/require"
)
const retries = 5
// solicit creates new solicit based on the mac address
func solicit(input string) (*dhcpv6.Message, error) {
mac, err := net.ParseMAC(input)
if err != nil {
return nil, err
}
duid := dhcpv6.Duid{
Type: dhcpv6.DUID_LLT,
HwType: iana.HWTypeEthernet,
Time: dhcpv6.GetTime(),
LinkLayerAddr: mac,
}
return dhcpv6.NewSolicitWithCID(duid, mac, dhcpv6.WithIAID([4]byte{1, 2, 3, 4}))
}
// server creates a server which responds with a predefined response
func serve(ctx context.Context, addr *net.UDPAddr, response dhcpv6.DHCPv6) error {
conn, err := net.ListenUDP("udp6", addr)
if err != nil {
return err
}
go func() {
defer conn.Close()
oobdata := []byte{}
buffer := make([]byte, client6.MaxUDPReceivedPacketSize)
for {
select {
case <-ctx.Done():
return
default:
conn.SetReadDeadline(time.Now().Add(1 * time.Second))
n, _, _, src, err := conn.ReadMsgUDP(buffer, oobdata)
if err != nil {
continue
}
_, err = dhcpv6.FromBytes(buffer[:n])
if err != nil {
continue
}
conn.SetWriteDeadline(time.Now().Add(1 * time.Second))
_, err = conn.WriteTo(response.ToBytes(), src)
if err != nil {
continue
}
}
}
}()
return nil
}
func TestNewClient(t *testing.T) {
c := NewClient()
require.NotNil(t, c)
require.Equal(t, c.ReadTimeout, client6.DefaultReadTimeout)
require.Equal(t, c.ReadTimeout, client6.DefaultWriteTimeout)
}
func TestOpenInvalidAddrFailes(t *testing.T) {
c := NewClient()
err := c.Open(512)
require.Error(t, err)
}
// This test uses port 15438 so please make sure its not used before running
func TestOpenClose(t *testing.T) {
c := NewClient()
addr, err := net.ResolveUDPAddr("udp6", ":15438")
require.NoError(t, err)
c.LocalAddr = addr
err = c.Open(512)
require.NoError(t, err)
defer c.Close()
}
// This test uses ports 15438 and 15439 so please make sure they are not used
// before running
func TestSendTimeout(t *testing.T) {
c := NewClient()
addr, err := net.ResolveUDPAddr("udp6", ":15438")
require.NoError(t, err)
remote, err := net.ResolveUDPAddr("udp6", ":15439")
require.NoError(t, err)
c.ReadTimeout = 50 * time.Millisecond
c.WriteTimeout = 50 * time.Millisecond
c.LocalAddr = addr
c.RemoteAddr = remote
err = c.Open(512)
require.NoError(t, err)
defer c.Close()
m, err := dhcpv6.NewMessage()
require.NoError(t, err)
_, err, timeout := c.Send(m).GetOrTimeout(200)
require.NoError(t, err)
require.True(t, timeout)
}
// This test uses ports 15438 and 15439 so please make sure they are not used
// before running
func TestSend(t *testing.T) {
s, err := solicit("c8:6c:2c:47:96:fd")
require.NoError(t, err)
require.NotNil(t, s)
a, err := dhcpv6.NewAdvertiseFromSolicit(s)
require.NoError(t, err)
require.NotNil(t, a)
c := NewClient()
addr, err := net.ResolveUDPAddr("udp6", ":15438")
require.NoError(t, err)
remote, err := net.ResolveUDPAddr("udp6", ":15439")
require.NoError(t, err)
c.LocalAddr = addr
c.RemoteAddr = remote
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
err = serve(ctx, remote, a)
require.NoError(t, err)
err = c.Open(16)
require.NoError(t, err)
defer c.Close()
f := c.Send(s)
var passed bool
for i := 0; i < retries; i++ {
response, err, timeout := f.GetOrTimeout(1000)
if timeout {
continue
}
passed = true
require.NoError(t, err)
require.Equal(t, a, response)
}
require.True(t, passed, "All attempts to TestSend timed out")
}
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