func TestSetICMPFilter(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris", "windows":
t.Skipf("not supported on %q", runtime.GOOS)
}
if !supportsIPv6 {
t.Skip("ipv6 is not supported")
}
if os.Getuid() != 0 {
t.Skip("must be root")
}
c, err := net.ListenPacket("ip6:ipv6-icmp", "::1")
if err != nil {
t.Fatal(err)
}
defer c.Close()
p := ipv6.NewPacketConn(c)
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeEchoRequest)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := p.SetICMPFilter(&f); err != nil {
t.Fatal(err)
}
kf, err := p.ICMPFilter()
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(kf, &f) {
t.Fatalf("got %#v; want %#v", kf, f)
}
}
func TestICMPFilter(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris", "windows":
t.Skipf("not supported on %q", runtime.GOOS)
}
var f ipv6.ICMPFilter
for _, toggle := range []bool{false, true} {
f.SetAll(toggle)
for _, typ := range []ipv6.ICMPType{
ipv6.ICMPTypeDestinationUnreachable,
ipv6.ICMPTypeEchoReply,
ipv6.ICMPTypeNeighborSolicitation,
ipv6.ICMPTypeDuplicateAddressConfirmation,
} {
f.Accept(typ)
if f.WillBlock(typ) {
t.Errorf("ipv6.ICMPFilter.Set(%v, false) failed", typ)
}
f.Block(typ)
if !f.WillBlock(typ) {
t.Errorf("ipv6.ICMPFilter.Set(%v, true) failed", typ)
}
}
}
}
func TestPacketConnReadWriteUnicastICMP(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris", "windows":
t.Skipf("not supported on %q", runtime.GOOS)
}
if !supportsIPv6 {
t.Skip("ipv6 is not supported")
}
if os.Getuid() != 0 {
t.Skip("must be root")
}
c, err := net.ListenPacket("ip6:ipv6-icmp", "::1")
if err != nil {
t.Fatal(err)
}
defer c.Close()
p := ipv6.NewPacketConn(c)
defer p.Close()
dst, err := net.ResolveIPAddr("ip6", "::1")
if err != nil {
t.Fatal(err)
}
pshicmp := icmp.IPv6PseudoHeader(c.LocalAddr().(*net.IPAddr).IP, dst.IP)
cm := ipv6.ControlMessage{
TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
Src: net.IPv6loopback,
}
cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagLoopback)
if ifi != nil {
cm.IfIndex = ifi.Index
}
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := p.SetICMPFilter(&f); err != nil {
t.Fatal(err)
}
var psh []byte
for i, toggle := range []bool{true, false, true} {
if toggle {
psh = nil
if err := p.SetChecksum(true, 2); err != nil {
t.Fatal(err)
}
} else {
psh = pshicmp
// Some platforms never allow to disable the
// kernel checksum processing.
p.SetChecksum(false, -1)
}
wb, err := (&icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: i + 1,
Data: []byte("HELLO-R-U-THERE"),
},
}).Marshal(psh)
if err != nil {
t.Fatal(err)
}
if err := p.SetControlMessage(cf, toggle); err != nil {
if nettest.ProtocolNotSupported(err) {
t.Skipf("not supported on %q", runtime.GOOS)
}
t.Fatal(err)
}
cm.HopLimit = i + 1
if err := p.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatal(err)
}
if n, err := p.WriteTo(wb, &cm, dst); err != nil {
t.Fatal(err)
} else if n != len(wb) {
t.Fatalf("got %v; want %v", n, len(wb))
}
rb := make([]byte, 128)
if err := p.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatal(err)
}
if n, cm, _, err := p.ReadFrom(rb); err != nil {
switch runtime.GOOS {
case "darwin": // older darwin kernels have some limitation on receiving icmp packet through raw socket
t.Logf("not supported on %q", runtime.GOOS)
continue
}
t.Fatal(err)
} else {
t.Logf("rcvd cmsg: %v", cm)
if m, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, rb[:n]); err != nil {
t.Fatal(err)
} else if m.Type != ipv6.ICMPTypeEchoReply || m.Code != 0 {
t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv6.ICMPTypeEchoReply, 0)
}
}
}
}
func TestPacketConnReadWriteMulticastICMP(t *testing.T) {
switch runtime.GOOS {
case "freebsd": // due to a bug on loopback marking
// See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065.
t.Skipf("not supported on %s", runtime.GOOS)
case "nacl", "plan9", "windows":
t.Skipf("not supported on %s", runtime.GOOS)
}
if !supportsIPv6 {
t.Skip("ipv6 is not supported")
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %s", runtime.GOOS)
}
for _, tt := range packetConnReadWriteMulticastICMPTests {
c, err := net.ListenPacket("ip6:ipv6-icmp", "::")
if err != nil {
t.Fatal(err)
}
defer c.Close()
pshicmp := icmp.IPv6PseudoHeader(c.LocalAddr().(*net.IPAddr).IP, tt.grp.IP)
p := ipv6.NewPacketConn(c)
defer p.Close()
if tt.src == nil {
if err := p.JoinGroup(ifi, tt.grp); err != nil {
t.Fatal(err)
}
defer p.LeaveGroup(ifi, tt.grp)
} else {
if err := p.JoinSourceSpecificGroup(ifi, tt.grp, tt.src); err != nil {
switch runtime.GOOS {
case "freebsd", "linux":
default: // platforms that don't support MLDv2 fail here
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
}
defer p.LeaveSourceSpecificGroup(ifi, tt.grp, tt.src)
}
if err := p.SetMulticastInterface(ifi); err != nil {
t.Fatal(err)
}
if _, err := p.MulticastInterface(); err != nil {
t.Fatal(err)
}
if err := p.SetMulticastLoopback(true); err != nil {
t.Fatal(err)
}
if _, err := p.MulticastLoopback(); err != nil {
t.Fatal(err)
}
cm := ipv6.ControlMessage{
TrafficClass: iana.DiffServAF11 | iana.CongestionExperienced,
Src: net.IPv6loopback,
IfIndex: ifi.Index,
}
cf := ipv6.FlagTrafficClass | ipv6.FlagHopLimit | ipv6.FlagSrc | ipv6.FlagDst | ipv6.FlagInterface | ipv6.FlagPathMTU
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := p.SetICMPFilter(&f); err != nil {
t.Fatal(err)
}
var psh []byte
for i, toggle := range []bool{true, false, true} {
if toggle {
psh = nil
if err := p.SetChecksum(true, 2); err != nil {
// Solaris never allows to
// modify ICMP properties.
if runtime.GOOS != "solaris" {
t.Fatal(err)
}
}
} else {
psh = pshicmp
// Some platforms never allow to
// disable the kernel checksum
// processing.
p.SetChecksum(false, -1)
}
wb, err := (&icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: i + 1,
Data: []byte("HELLO-R-U-THERE"),
},
}).Marshal(psh)
if err != nil {
t.Fatal(err)
}
if err := p.SetControlMessage(cf, toggle); err != nil {
if nettest.ProtocolNotSupported(err) {
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
}
if err := p.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil {
t.Fatal(err)
}
cm.HopLimit = i + 1
if n, err := p.WriteTo(wb, &cm, tt.grp); err != nil {
t.Fatal(err)
} else if n != len(wb) {
t.Fatalf("got %v; want %v", n, len(wb))
}
rb := make([]byte, 128)
if n, _, _, err := p.ReadFrom(rb); err != nil {
switch runtime.GOOS {
case "darwin": // older darwin kernels have some limitation on receiving icmp packet through raw socket
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
} else {
if m, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, rb[:n]); err != nil {
t.Fatal(err)
} else if m.Type != ipv6.ICMPTypeEchoReply || m.Code != 0 {
t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv6.ICMPTypeEchoReply, 0)
}
}
}
}
}
func doPing(tt pingTest, seq int) error {
c, err := icmp.ListenPacket(tt.network, tt.address)
if err != nil {
return err
}
defer c.Close()
dst, err := googleAddr(c, tt.protocol)
if err != nil {
return err
}
if tt.protocol == iana.ProtocolIPv6ICMP {
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeDestinationUnreachable)
f.Accept(ipv6.ICMPTypePacketTooBig)
f.Accept(ipv6.ICMPTypeTimeExceeded)
f.Accept(ipv6.ICMPTypeParameterProblem)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := c.IPv6PacketConn().SetICMPFilter(&f); err != nil {
return err
}
}
wm := icmp.Message{
Type: tt.mtype, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1 << uint(seq),
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
return err
}
if n, err := c.WriteTo(wb, dst); err != nil {
return err
} else if n != len(wb) {
return fmt.Errorf("got %v; want %v", n, len(wb))
}
rb := make([]byte, 1500)
if err := c.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil {
return err
}
n, peer, err := c.ReadFrom(rb)
if err != nil {
return err
}
rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
if err != nil {
return err
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply, ipv6.ICMPTypeEchoReply:
return nil
default:
return fmt.Errorf("got %+v from %v; want echo reply", rm, peer)
}
}
func ExamplePacketConn_tracingIPPacketRoute() {
// Tracing an IP packet route to www.google.com.
const host = "www.google.com"
ips, err := net.LookupIP(host)
if err != nil {
log.Fatal(err)
}
var dst net.IPAddr
for _, ip := range ips {
if ip.To16() != nil && ip.To4() == nil {
dst.IP = ip
fmt.Printf("using %v for tracing an IP packet route to %s\n", dst.IP, host)
break
}
}
if dst.IP == nil {
log.Fatal("no AAAA record found")
}
c, err := net.ListenPacket(fmt.Sprintf("ip6:%d", iana.ProtocolIPv6ICMP), "::") // ICMP for IPv6
if err != nil {
log.Fatal(err)
}
defer c.Close()
p := ipv6.NewPacketConn(c)
if err := p.SetControlMessage(ipv6.FlagHopLimit|ipv6.FlagSrc|ipv6.FlagDst|ipv6.FlagInterface, true); err != nil {
log.Fatal(err)
}
wm := icmp.Message{
Type: ipv6.ICMPTypeEchoRequest, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff,
Data: []byte("HELLO-R-U-THERE"),
},
}
var f ipv6.ICMPFilter
f.SetAll(true)
f.Accept(ipv6.ICMPTypeTimeExceeded)
f.Accept(ipv6.ICMPTypeEchoReply)
if err := p.SetICMPFilter(&f); err != nil {
log.Fatal(err)
}
var wcm ipv6.ControlMessage
rb := make([]byte, 1500)
for i := 1; i <= 64; i++ { // up to 64 hops
wm.Body.(*icmp.Echo).Seq = i
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
// In the real world usually there are several
// multiple traffic-engineered paths for each hop.
// You may need to probe a few times to each hop.
begin := time.Now()
wcm.HopLimit = i
if _, err := p.WriteTo(wb, &wcm, &dst); err != nil {
log.Fatal(err)
}
if err := p.SetReadDeadline(time.Now().Add(3 * time.Second)); err != nil {
log.Fatal(err)
}
n, rcm, peer, err := p.ReadFrom(rb)
if err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
fmt.Printf("%v\t*\n", i)
continue
}
log.Fatal(err)
}
rm, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, rb[:n])
if err != nil {
log.Fatal(err)
}
rtt := time.Since(begin)
// In the real world you need to determine whether the
// received message is yours using ControlMessage.Src,
// ControlMesage.Dst, icmp.Echo.ID and icmp.Echo.Seq.
switch rm.Type {
case ipv6.ICMPTypeTimeExceeded:
names, _ := net.LookupAddr(peer.String())
fmt.Printf("%d\t%v %+v %v\n\t%+v\n", i, peer, names, rtt, rcm)
case ipv6.ICMPTypeEchoReply:
names, _ := net.LookupAddr(peer.String())
fmt.Printf("%d\t%v %+v %v\n\t%+v\n", i, peer, names, rtt, rcm)
return
}
}
}
func main() {
var err error
// create redis connection pool
if db, err = pool.New("tcp", "localhost:6379", 10); err != nil {
panic(err)
}
defer db.Empty()
dbc, err := db.Get()
if err != nil {
fmt.Println(err)
}
for k, v := range defaultConfig {
dbc.PipeAppend("HSETNX", "fahrrad/config", k, v)
}
for k, _ := range defaultConfig {
dbc.PipeAppend("HGET", "fahrrad/config", k)
}
for _, _ = range defaultConfig {
dbc.PipeResp()
}
var v int
v, err = dbc.PipeResp().Int()
if err == nil {
AssignedPrefixLength = uint8(v)
}
v, err = dbc.PipeResp().Int()
if err == nil {
OnLinkPrefixLength = uint8(v)
}
v, err = dbc.PipeResp().Int()
if err == nil {
DefaultValidLifetime = uint32(v)
}
v, err = dbc.PipeResp().Int()
if err == nil {
DefaultPreferredLifetime = uint32(v)
}
v, err = dbc.PipeResp().Int()
if err == nil {
TickerDelay = time.Duration(v) * time.Second
}
defer db.Put(dbc)
// open listening connection
conn, err := net.ListenIP("ip6:ipv6-icmp", &net.IPAddr{net.IPv6unspecified, ""})
if err != nil {
panic(err)
}
defer conn.Close()
pc = ipv6.NewPacketConn(conn)
// RFC4861 requires the hop limit set to 255, but the default value in golang is 64
pc.SetHopLimit(255)
// only accept neighbor discovery messages
filter := new(ipv6.ICMPFilter)
filter.SetAll(true)
filter.Accept(ipv6.ICMPTypeRouterSolicitation)
filter.Accept(ipv6.ICMPTypeRouterAdvertisement)
filter.Accept(ipv6.ICMPTypeNeighborSolicitation)
filter.Accept(ipv6.ICMPTypeNeighborAdvertisement)
if err = pc.SetICMPFilter(filter); err != nil {
panic(err)
}
rschan = make(chan routerSolicitation)
go hostManager()
// read from socket
buf := make([]byte, 512)
for {
n, _, srcAddr, err := pc.ReadFrom(buf)
if err != nil {
panic(err)
}
go handleND(srcAddr, buf[:n])
}
}