func TestRawConnUnicastSocketOptions(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris":
t.Skipf("not supported on %q", runtime.GOOS)
}
if os.Getuid() != 0 {
t.Skip("must be root")
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %q", runtime.GOOS)
}
c, err := net.ListenPacket("ip4:icmp", "127.0.0.1")
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
testUnicastSocketOptions(t, r)
}
func TestRawConnUnicastSocketOptions(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9":
t.Skipf("not supported on %s", runtime.GOOS)
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %s", runtime.GOOS)
}
c, err := net.ListenPacket("ip4:icmp", "127.0.0.1")
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
testUnicastSocketOptions(t, r)
}
func TestRawConnMulticastSocketOptions(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9":
t.Skipf("not supported on %s", runtime.GOOS)
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %s", runtime.GOOS)
}
for _, tt := range rawConnMulticastSocketOptionTests {
c, err := net.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
defer r.Close()
if tt.src == nil {
testMulticastSocketOptions(t, r, ifi, tt.grp)
} else {
testSourceSpecificMulticastSocketOptions(t, r, ifi, tt.grp, tt.src)
}
}
}
func TestRawConnMulticastSocketOptions(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris":
t.Skipf("not supported on %q", runtime.GOOS)
}
if os.Getuid() != 0 {
t.Skip("must be root")
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %q", runtime.GOOS)
}
c, err := net.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
t.Fatalf("net.ListenPacket failed: %v", err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatalf("ipv4.NewRawConn failed: %v", err)
}
testMulticastSocketOptions(t, r, ifi, &net.IPAddr{IP: net.IPv4(224, 0, 0, 250)}) /// see RFC 4727
}
func main() {
flag.Parse()
ip := net.ParseIP(*dst)
if ip == nil {
log.Fatal("destination not found")
}
c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", *proto), "0.0.0.0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
p, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
b := []byte("HELLO-R-U-THERE")
h := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TotalLen: ipv4.HeaderLen + len(b),
Protocol: *proto,
Dst: ip.To4(),
}
if err := p.WriteTo(h, b, nil); err != nil {
log.Println(err)
}
}
func (i *TCPStreamInjector) Init(netInterface string) error {
var err error
i.packetConn, err = net.ListenPacket("ip4:tcp", netInterface)
if err != nil {
return err
}
i.rawConn, err = ipv4.NewRawConn(i.packetConn)
return err
}
func ExampleRawConn_advertisingOSPFHello() {
c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", iana.ProtocolOSPFIGP), "0.0.0.0") // OSPF for IPv4
if err != nil {
log.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
allSPFRouters := net.IPAddr{IP: net.IPv4(224, 0, 0, 5)}
if err := r.JoinGroup(en0, &allSPFRouters); err != nil {
log.Fatal(err)
}
defer r.LeaveGroup(en0, &allSPFRouters)
hello := make([]byte, 24) // fake hello data, you need to implement this
ospf := make([]byte, 24) // fake ospf header, you need to implement this
ospf[0] = 2 // version 2
ospf[1] = 1 // hello packet
ospf = append(ospf, hello...)
iph := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TOS: iana.DiffServCS6,
TotalLen: ipv4.HeaderLen + len(ospf),
TTL: 1,
Protocol: iana.ProtocolOSPFIGP,
Dst: allSPFRouters.IP.To4(),
}
var cm *ipv4.ControlMessage
switch runtime.GOOS {
case "darwin", "linux":
cm = &ipv4.ControlMessage{IfIndex: en0.Index}
default:
if err := r.SetMulticastInterface(en0); err != nil {
log.Fatal(err)
}
}
if err := r.WriteTo(iph, ospf, cm); err != nil {
log.Fatal(err)
}
}
// Start kicks off the pinging process. It takes the list of IP addresses added by
// AddIPs() and sends ICMP ECHO_REQUEST to all of them at the specified Interval.
// Results are sent via the returned channel. The caller is expected to read the
// channel so it won't get blocked.
//
// Only a single Start can be called at a time. If the second call to Start is made,
// and error will be returned.
func (this *Pinger) Start() (<-chan *PingResult, error) {
if !atomic.CompareAndSwapInt64(&this.pid, 0, int64(os.Getpid()&0xffff)) {
return nil, fmt.Errorf("ping/Start: Pinger already running")
}
switch runtime.GOOS {
case "nacl", "plan9", "solaris", "windows":
return nil, fmt.Errorf("ping/Start: Operation not supported on %q", runtime.GOOS)
}
if os.Getuid() != 0 {
return nil, fmt.Errorf("ping/Start: User must be root")
}
this.updateParams()
if len(this.payload) < this.Size {
this.payload = make([]byte, this.Size)
} else {
this.payload = this.payload[:this.Size]
}
var err error
this.pconn, err = net.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
return nil, err
}
this.rconn, err = ipv4.NewRawConn(this.pconn)
if err != nil {
return nil, err
}
cf := ipv4.FlagTTL | ipv4.FlagDst | ipv4.FlagInterface
if err := this.rconn.SetControlMessage(cf, true); err != nil {
//glog.Errorf("ping/sender: Error setting control message: %v", err)
return nil, err
}
this.wg.Add(1)
go this.receiver()
this.wg.Add(1)
go this.sender()
return this.reschan, nil
}
func TestIPPerInterfaceSingleRawConnWithSingleGroupListener(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "windows":
t.Skipf("not supported on %s", runtime.GOOS)
}
if testing.Short() {
t.Skip("to avoid external network")
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
gaddr := net.IPAddr{IP: net.IPv4(224, 0, 0, 254)} // see RFC 4727
type ml struct {
c *ipv4.RawConn
ifi *net.Interface
}
var mlt []*ml
ift, err := net.Interfaces()
if err != nil {
t.Fatal(err)
}
for i, ifi := range ift {
ip, ok := nettest.IsMulticastCapable("ip4", &ifi)
if !ok {
continue
}
c, err := net.ListenPacket("ip4:253", ip.String()) // unicast address
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
if err := r.JoinGroup(&ifi, &gaddr); err != nil {
t.Fatal(err)
}
mlt = append(mlt, &ml{r, &ift[i]})
}
for _, m := range mlt {
if err := m.c.LeaveGroup(m.ifi, &gaddr); err != nil {
t.Fatal(err)
}
}
}
func TestIPSingleRawConnWithSingleGroupListener(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "windows":
t.Skipf("not supported on %s", runtime.GOOS)
}
if testing.Short() {
t.Skip("to avoid external network")
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
c, err := net.ListenPacket("ip4:icmp", "0.0.0.0") // wildcard address
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
gaddr := net.IPAddr{IP: net.IPv4(224, 0, 0, 254)} // see RFC 4727
var mift []*net.Interface
ift, err := net.Interfaces()
if err != nil {
t.Fatal(err)
}
for i, ifi := range ift {
if _, ok := nettest.IsMulticastCapable("ip4", &ifi); !ok {
continue
}
if err := r.JoinGroup(&ifi, &gaddr); err != nil {
t.Fatal(err)
}
mift = append(mift, &ift[i])
}
for _, ifi := range mift {
if err := r.LeaveGroup(ifi, &gaddr); err != nil {
t.Fatal(err)
}
}
}
func main() {
flag.Parse()
c, err := net.ListenPacket(fmt.Sprintf("ip4:%d", *proto), "0.0.0.0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
p, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
p.SetControlMessage(ipv4.FlagTTL|ipv4.FlagSrc|ipv4.FlagDst|ipv4.FlagInterface, true)
b := make([]byte, 8192)
for {
h, pp, cm, err := p.ReadFrom(b)
if err != nil {
log.Println(err)
continue
}
log.Printf("%d bytes rcvd, %v, %v\n", len(pp), h, cm)
}
}
func TestRawConnReadWriteUnicastICMP(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "windows":
t.Skipf("not supported on %s", runtime.GOOS)
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %s", runtime.GOOS)
}
c, err := net.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
t.Fatal(err)
}
defer c.Close()
dst, err := net.ResolveIPAddr("ip4", "127.0.0.1")
if err != nil {
t.Fatal(err)
}
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
defer r.Close()
cf := ipv4.FlagTTL | ipv4.FlagDst | ipv4.FlagInterface
for i, toggle := range []bool{true, false, true} {
wb, err := (&icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: i + 1,
Data: []byte("HELLO-R-U-THERE"),
},
}).Marshal(nil)
if err != nil {
t.Fatal(err)
}
wh := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TOS: i + 1,
TotalLen: ipv4.HeaderLen + len(wb),
TTL: i + 1,
Protocol: 1,
Dst: dst.IP,
}
if err := r.SetControlMessage(cf, toggle); err != nil {
if nettest.ProtocolNotSupported(err) {
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
}
if err := r.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatal(err)
}
if err := r.WriteTo(wh, wb, nil); err != nil {
t.Fatal(err)
}
rb := make([]byte, ipv4.HeaderLen+128)
loop:
if err := r.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatal(err)
}
if _, b, _, err := r.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 {
m, err := icmp.ParseMessage(iana.ProtocolICMP, b)
if err != nil {
t.Fatal(err)
}
if runtime.GOOS == "linux" && m.Type == ipv4.ICMPTypeEcho {
// On Linux we must handle own sent packets.
goto loop
}
if m.Type != ipv4.ICMPTypeEchoReply || m.Code != 0 {
t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0)
}
}
}
}
func TestRawConnReadWriteMulticastICMP(t *testing.T) {
if testing.Short() {
t.Skip("to avoid external network")
}
if m, ok := nettest.SupportsRawIPSocket(); !ok {
t.Skip(m)
}
ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
if ifi == nil {
t.Skipf("not available on %s", runtime.GOOS)
}
for _, tt := range rawConnReadWriteMulticastICMPTests {
c, err := net.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
t.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatal(err)
}
defer r.Close()
if tt.src == nil {
if err := r.JoinGroup(ifi, tt.grp); err != nil {
t.Fatal(err)
}
defer r.LeaveGroup(ifi, tt.grp)
} else {
if err := r.JoinSourceSpecificGroup(ifi, tt.grp, tt.src); err != nil {
switch runtime.GOOS {
case "freebsd", "linux":
default: // platforms that don't support IGMPv2/3 fail here
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
}
defer r.LeaveSourceSpecificGroup(ifi, tt.grp, tt.src)
}
if err := r.SetMulticastInterface(ifi); err != nil {
t.Fatal(err)
}
if _, err := r.MulticastInterface(); err != nil {
t.Fatal(err)
}
if err := r.SetMulticastLoopback(true); err != nil {
t.Fatal(err)
}
if _, err := r.MulticastLoopback(); err != nil {
t.Fatal(err)
}
cf := ipv4.FlagTTL | ipv4.FlagDst | ipv4.FlagInterface
for i, toggle := range []bool{true, false, true} {
wb, err := (&icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: i + 1,
Data: []byte("HELLO-R-U-THERE"),
},
}).Marshal(nil)
if err != nil {
t.Fatal(err)
}
wh := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TOS: i + 1,
TotalLen: ipv4.HeaderLen + len(wb),
Protocol: 1,
Dst: tt.grp.IP,
}
if err := r.SetControlMessage(cf, toggle); err != nil {
if nettest.ProtocolNotSupported(err) {
t.Logf("not supported on %s", runtime.GOOS)
continue
}
t.Fatal(err)
}
if err := r.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil {
t.Fatal(err)
}
r.SetMulticastTTL(i + 1)
if err := r.WriteTo(wh, wb, nil); err != nil {
t.Fatal(err)
}
rb := make([]byte, ipv4.HeaderLen+128)
if rh, b, _, err := r.ReadFrom(rb); err != nil {
t.Fatal(err)
} else {
m, err := icmp.ParseMessage(iana.ProtocolICMP, b)
if err != nil {
t.Fatal(err)
}
switch {
case (rh.Dst.IsLoopback() || rh.Dst.IsLinkLocalUnicast() || rh.Dst.IsGlobalUnicast()) && m.Type == ipv4.ICMPTypeEchoReply && m.Code == 0: // net.inet.icmp.bmcastecho=1
case rh.Dst.IsMulticast() && m.Type == ipv4.ICMPTypeEcho && m.Code == 0: // net.inet.icmp.bmcastecho=0
default:
t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0)
}
}
}
}
}
func (s *Server) ListenAndServeUDPv4() {
ipAddr := &net.IPAddr{IP: net.IPv4zero}
conn, err := net.ListenIP("ip4:udp", ipAddr)
if err != nil {
l.Info(err.Error())
return
}
defer conn.Close()
if err = bindToDevice(conn, "tap"+s.name); err != nil {
l.Info(err.Error())
return
}
s.Lock()
s.ipv4conn, err = ipv4.NewRawConn(conn)
s.Unlock()
if err != nil {
l.Info(err.Error())
return
}
if err = s.ipv4conn.SetControlMessage(ipv4.FlagDst, true); err != nil {
l.Warning(err.Error())
return
}
buffer := make([]byte, 1500)
var gw net.IP
for _, addr := range s.metadata.Network.IP {
if addr.Family == "ipv4" && addr.Host == "true" && addr.Gateway == "true" {
gw = net.ParseIP(addr.Address)
}
}
iface, err := net.InterfaceByName("tap" + s.name)
if err != nil {
l.Info(fmt.Sprintf("failed to get iface: %s", err.Error()))
return
}
for {
select {
case <-s.done:
return
default:
s.ipv4conn.SetReadDeadline(time.Now().Add(time.Second))
hdr, _, _, err := s.ipv4conn.ReadFrom(buffer)
if err != nil {
switch v := err.(type) {
case *net.OpError:
if v.Timeout() {
continue
}
case *net.AddrError:
if v.Timeout() {
continue
}
case *net.UnknownNetworkError:
if v.Timeout() {
continue
}
default:
l.Warning(err.Error())
return
}
}
var ip4 layers.IPv4
var udp layers.UDP
var dhcp4req layers.DHCPv4
parser := gopacket.NewDecodingLayerParser(layers.LayerTypeIPv4, &ip4, &udp, &dhcp4req)
decoded := []gopacket.LayerType{}
err = parser.DecodeLayers(buffer, &decoded)
for _, layerType := range decoded {
switch layerType {
case layers.LayerTypeDHCPv4:
if dhcp4req.Operation == layers.DHCP_MSG_REQ {
dhcp4res, err := s.ServeUDPv4(&dhcp4req)
if err != nil {
l.Warning(err.Error())
continue
}
if dhcp4res == nil {
// ignore empty dhcp packets
continue
}
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{true, true}
gopacket.SerializeLayers(buf, opts,
&layers.UDP{SrcPort: 67, DstPort: 68},
dhcp4res)
wcm := ipv4.ControlMessage{TTL: 255}
wcm.Dst = net.IPv4bcast.To4()
wcm.Src = gw.To4()
wcm.IfIndex = iface.Index
err = s.ipv4conn.WriteTo(&ipv4.Header{Len: 20, TOS: hdr.TOS, TotalLen: 20 + int(len(buf.Bytes())), FragOff: 0, TTL: 255, Protocol: int(layers.IPProtocolUDP), Src: gw.To4(), Dst: net.IPv4bcast.To4()}, buf.Bytes(), &wcm)
if err != nil {
l.Warning(err.Error())
continue
}
} else {
continue
}
}
}
}
}
}
//sendPacket generates & sends a packet of arbitrary size to a specific destination.
//The size specified should be larger then 40bytes.
func sendPacket(sourceIP string, destinationIP string, size int, message string, appID int, chanID int, icmpType layers.ICMPv4TypeCode) []byte {
var payloadSize int
if size < 28 {
//Unable to create smaller packets.
payloadSize = 0
} else {
payloadSize = size - 28
}
//Convert IP to 4bit representation
srcIP := net.ParseIP(sourceIP).To4()
dstIP := net.ParseIP(destinationIP).To4()
//IP Layer
ip := layers.IPv4{
SrcIP: srcIP,
DstIP: dstIP,
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolICMPv4,
}
icmp := layers.ICMPv4{
TypeCode: icmpType,
}
opts := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
ipHeaderBuf := gopacket.NewSerializeBuffer()
err := ip.SerializeTo(ipHeaderBuf, opts)
if err != nil {
panic(err)
}
//Set "Don't Fragment"-Flag in Header
ipHeader, err := ipv4.ParseHeader(ipHeaderBuf.Bytes())
ipHeader.Flags |= ipv4.DontFragment
if err != nil {
panic(err)
}
payloadBuf := gopacket.NewSerializeBuffer()
//Influence the payload size
payload := gopacket.Payload(generatePayload(payloadSize, ","+strconv.Itoa(appID)+","+strconv.Itoa(chanID)+","+message+","))
err = gopacket.SerializeLayers(payloadBuf, opts, &icmp, payload)
if err != nil {
panic(err)
}
//Send packet
var packetConn net.PacketConn
var rawConn *ipv4.RawConn
packetConn, err = net.ListenPacket("ip4:icmp", srcIP.String())
if err != nil {
panic(err)
}
rawConn, err = ipv4.NewRawConn(packetConn)
if err != nil {
panic(err)
}
err = rawConn.WriteTo(ipHeader, payloadBuf.Bytes(), nil)
return append(ipHeaderBuf.Bytes(), payloadBuf.Bytes()...)
}