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package ndp
import (
"bytes"
"errors"
"net"
"net/netip"
"sync"
"testing"
"time"
"github.com/google/go-cmp/cmp"
)
func TestConn(t *testing.T) {
tests := []struct {
name string
fn func(t *testing.T, c1, c2 *Conn, addr netip.Addr)
}{
{
name: "echo",
fn: testConnEcho,
},
{
name: "filter invalid",
fn: testConnFilterInvalid,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
c1, c2, addr := testICMPConn(t)
tt.fn(t, c1, c2, addr)
})
}
}
func testConnEcho(t *testing.T, c1, c2 *Conn, addr netip.Addr) {
// Echo this message between two connections.
rs := &RouterSolicitation{}
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
// Read and bounce the message back to the second Conn.
m, _, _, err := c2.ReadFrom()
if err != nil {
panicf("failed to read from c2: %v", err)
}
if err := c2.WriteTo(m, nil, addr); err != nil {
panicf("failed to write from c2: %v", err)
}
}()
if err := c1.WriteTo(rs, nil, addr); err != nil {
t.Fatalf("failed to write from c1: %v", err)
}
m, _, _, err := c1.ReadFrom()
if err != nil {
t.Fatalf("failed to read from c1: %v", err)
}
wg.Wait()
if diff := cmp.Diff(rs, m); diff != "" {
t.Fatalf("unexpected message (-want +got):\n%s", diff)
}
}
func testConnFilterInvalid(t *testing.T, c1, c2 *Conn, addr netip.Addr) {
// Echo this message between two connections.
rs := &RouterSolicitation{}
var wg sync.WaitGroup
wg.Add(1)
sigC := make(chan struct{})
go func() {
defer wg.Done()
// Wait for the caller to send us a message, then send:
// - invalid message (filtered)
// - valid message
// And finally force a timeout to verify the ReadFrom error check.
m, _, _, err := c2.ReadFrom()
if err != nil {
panicf("failed to read from c2: %v", err)
}
if err := c2.writeRaw(bytes.Repeat([]byte{0xff}, 255), nil, addr); err != nil {
panicf("failed to write invalid from c2: %v", err)
}
// Write in lockstep and wait for the consumer to acknowledge the write.
if err := c2.WriteTo(m, nil, addr); err != nil {
panicf("failed to write valid from c2: %v", err)
}
<-sigC
if err := c1.SetReadDeadline(time.Unix(1, 0)); err != nil {
panicf("failed to interrupt c1: %v", err)
}
<-sigC
}()
if err := c1.WriteTo(rs, nil, addr); err != nil {
t.Fatalf("failed to write from c1: %v", err)
}
var m Message
for i := 0; i < 2; i++ {
// Acknowledge each write from the other Conn.
msg, _, _, err := c1.ReadFrom()
sigC <- struct{}{}
if err == nil {
m = msg
continue
}
switch i {
case 0:
t.Fatalf("failed to read from c1: %v", err)
case 1:
var nerr net.Error
if !errors.As(err, &nerr) {
t.Fatalf("error is not net.Error: %v", err)
}
if !nerr.Timeout() {
t.Fatal("error did not indicate a timeout")
}
default:
panic("too many loop iterations")
}
}
wg.Wait()
if diff := cmp.Diff(rs, m); diff != "" {
t.Fatalf("unexpected message (-want +got):\n%s", diff)
}
}
func TestSolicitedNodeMulticast(t *testing.T) {
tests := []struct {
name string
ip netip.Addr
snm netip.Addr
ok bool
}{
{
name: "bad, IPv4",
ip: netip.MustParseAddr("192.168.1.1"),
},
{
name: "ok, link-local",
ip: netip.MustParseAddr("fe80::1234:5678"),
snm: netip.MustParseAddr("ff02::1:ff34:5678"),
ok: true,
},
{
name: "ok, global",
ip: netip.MustParseAddr("2001:db8::dead:beef"),
snm: netip.MustParseAddr("ff02::1:ffad:beef"),
ok: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
snm, err := SolicitedNodeMulticast(tt.ip)
if err != nil && tt.ok {
t.Fatalf("unexpected error: %v", err)
}
if err == nil && !tt.ok {
t.Fatal("expected an error, but none occurred")
}
if err != nil {
t.Logf("OK error: %v", err)
return
}
if diff := cmp.Diff(tt.snm, snm, cmp.Comparer(addrEqual)); diff != "" {
t.Fatalf("unexpected solicited-node multicast address (-want +got):\n%s", diff)
}
})
}
}
func addrEqual(x, y netip.Addr) bool { return x == y }
func prefixEqual(x, y netip.Prefix) bool { return x == y }
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