96 lines
2.3 KiB
Go
96 lines
2.3 KiB
Go
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package dhcp4
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import (
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"fmt"
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"net"
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"os"
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"testing"
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"time"
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"github.com/google/go-cmp/cmp"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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"github.com/google/gopacket/pcapgo"
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)
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type packet struct {
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data []byte
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ip net.IP
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err error
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}
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type replayer struct {
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pcapr *pcapgo.Reader
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}
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func (r *replayer) Close() error { return nil }
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func (r *replayer) Write(b []byte) error { /*log.Printf("-> %v", b); */ return nil }
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func (r *replayer) SetReadTimeout(t time.Duration) error { return nil }
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func (r *replayer) ReadFrom() ([]byte, net.IP, error) {
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data, _, err := r.pcapr.ReadPacketData()
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if err != nil {
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return nil, nil, err
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}
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pkt := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.DecodeOptions{})
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// TODO: get source IP
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udp := pkt.Layer(layers.LayerTypeUDP)
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if udp == nil {
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return nil, nil, fmt.Errorf("pcap contained unexpected non-UDP packet")
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}
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//log.Printf("ReadFrom(): %v, %v, pkt = %+v", udp.LayerPayload(), err, pkt)
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return udp.LayerPayload(), net.ParseIP("192.168.23.1"), err
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}
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func TestDHCP4(t *testing.T) {
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f, err := os.Open("testdata/fiber7.pcap")
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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pcapr, err := pcapgo.NewReader(f)
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if err != nil {
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t.Fatal(err)
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}
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mac, err := net.ParseMAC("d8:58:d7:00:4e:df")
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if err != nil {
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t.Fatal(err)
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}
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now := time.Now()
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c := Client{
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hardwareAddr: mac,
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timeNow: func() time.Time { return now },
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connection: &replayer{pcapr: pcapr},
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randRead: func(b []byte) (n int, err error) {
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if got, want := len(b), 4; got != want {
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return 0, fmt.Errorf("github.com/d2g/dhcp4client request unexpected amount of bytes: got %d, want %d", got, want)
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}
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// TODO: read the transaction ID from the pcap file
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copy(b, []byte{0x77, 0x08, 0xd7, 0x24})
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return len(b), nil
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},
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}
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c.ObtainOrRenew()
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if err := c.Err(); err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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got := c.Config()
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want := Config{
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RenewAfter: now.Add(13*time.Minute + 24*time.Second),
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ClientIP: "85.195.207.62",
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SubnetMask: "255.255.255.128",
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Router: "85.195.207.1",
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DNS: []string{
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"77.109.128.2",
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"213.144.129.20",
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},
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}
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if diff := cmp.Diff(got, want); diff != "" {
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t.Fatalf("unexpected config: diff (-got +want):\n%s", diff)
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}
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}
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