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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dhcp
import (
"context"
"strings"
"testing"
"time"
"gvisor.googlesource.com/gvisor/pkg/tcpip"
"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/channel"
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/sniffer"
"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv4"
"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/udp"
)
func TestDHCP(t *testing.T) {
const defaultMTU = 65536
id, linkEP := channel.New(256, defaultMTU, "")
if testing.Verbose() {
id = sniffer.New(id)
}
go func() {
for pkt := range linkEP.C {
v := make(buffer.View, len(pkt.Header)+len(pkt.Payload))
copy(v, pkt.Header)
copy(v[len(pkt.Header):], pkt.Payload)
vv := v.ToVectorisedView([1]buffer.View{})
linkEP.Inject(pkt.Proto, &vv)
}
}()
s := stack.New([]string{ipv4.ProtocolName}, []string{udp.ProtocolName}, stack.Options{})
const nicid tcpip.NICID = 1
if err := s.CreateNIC(nicid, id); err != nil {
t.Fatal(err)
}
if err := s.AddAddress(nicid, ipv4.ProtocolNumber, "\x00\x00\x00\x00"); err != nil {
t.Fatal(err)
}
if err := s.AddAddress(nicid, ipv4.ProtocolNumber, "\xff\xff\xff\xff"); err != nil {
t.Fatal(err)
}
const serverAddr = tcpip.Address("\xc0\xa8\x03\x01")
if err := s.AddAddress(nicid, ipv4.ProtocolNumber, serverAddr); err != nil {
t.Fatal(err)
}
s.SetRouteTable([]tcpip.Route{{
Destination: tcpip.Address(strings.Repeat("\x00", 4)),
Mask: tcpip.Address(strings.Repeat("\x00", 4)),
Gateway: "",
NIC: nicid,
}})
var clientAddrs = []tcpip.Address{"\xc0\xa8\x03\x02", "\xc0\xa8\x03\x03"}
serverCfg := Config{
ServerAddress: serverAddr,
SubnetMask: "\xff\xff\xff\x00",
Gateway: "\xc0\xa8\x03\xF0",
DomainNameServer: "\x08\x08\x08\x08",
LeaseLength: 24 * time.Hour,
}
serverCtx, cancel := context.WithCancel(context.Background())
defer cancel()
_, err := NewServer(serverCtx, s, clientAddrs, serverCfg)
if err != nil {
t.Fatal(err)
}
const clientLinkAddr0 = tcpip.LinkAddress("\x52\x11\x22\x33\x44\x52")
c0 := NewClient(s, nicid, clientLinkAddr0)
if err := c0.Request(context.Background(), ""); err != nil {
t.Fatal(err)
}
if got, want := c0.Address(), clientAddrs[0]; got != want {
t.Errorf("c.Addr()=%s, want=%s", got, want)
}
if err := c0.Request(context.Background(), ""); err != nil {
t.Fatal(err)
}
if got, want := c0.Address(), clientAddrs[0]; got != want {
t.Errorf("c.Addr()=%s, want=%s", got, want)
}
const clientLinkAddr1 = tcpip.LinkAddress("\x52\x11\x22\x33\x44\x53")
c1 := NewClient(s, nicid, clientLinkAddr1)
if err := c1.Request(context.Background(), ""); err != nil {
t.Fatal(err)
}
if got, want := c1.Address(), clientAddrs[1]; got != want {
t.Errorf("c.Addr()=%s, want=%s", got, want)
}
if err := c0.Request(context.Background(), ""); err != nil {
t.Fatal(err)
}
if got, want := c0.Address(), clientAddrs[0]; got != want {
t.Errorf("c.Addr()=%s, want=%s", got, want)
}
if got, want := c0.Config(), serverCfg; got != want {
t.Errorf("client config:\n\t%#+v\nwant:\n\t%#+v", got, want)
}
}
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