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.Fatalf("net.ListenPacket failed: %v", err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatalf("ipv4.NewRawConn failed: %v", err)
}
testUnicastSocketOptions(t, r)
}
func ExampleWriteIPOSPFHello() {
var ifs []*net.Interface
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en0)
en1, err := net.InterfaceByIndex(911)
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en1)
c, err := net.ListenPacket("ip4:89", "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)
}
for _, ifi := range ifs {
err := r.JoinGroup(ifi, &net.IPAddr{IP: AllSPFRouters})
if err != nil {
log.Fatal(err)
}
err = r.JoinGroup(ifi, &net.IPAddr{IP: AllDRouters})
if err != nil {
log.Fatal(err)
}
}
hello := make([]byte, OSPFHelloHeaderLen)
ospf := make([]byte, OSPFHeaderLen)
ospf[0] = OSPF_VERSION
ospf[1] = OSPF_TYPE_HELLO
ospf = append(ospf, hello...)
iph := &ipv4.Header{}
iph.Version = ipv4.Version
iph.Len = ipv4.HeaderLen
iph.TOS = iana.DiffServCS6
iph.TotalLen = ipv4.HeaderLen + len(ospf)
iph.TTL = 1
iph.Protocol = 89
iph.Dst = AllSPFRouters
for _, ifi := range ifs {
err := r.SetMulticastInterface(ifi)
if err != nil {
return
}
err = r.WriteTo(iph, ospf, nil)
if err != nil {
return
}
}
}
func ExampleIPOSPFListener() {
var ifs []*net.Interface
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en0)
en1, err := net.InterfaceByIndex(911)
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en1)
c, err := net.ListenPacket("ip4:89", "0.0.0.0") // OSFP for IPv4
if err != nil {
log.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
for _, ifi := range ifs {
err := r.JoinGroup(ifi, &net.IPAddr{IP: AllSPFRouters})
if err != nil {
log.Fatal(err)
}
err = r.JoinGroup(ifi, &net.IPAddr{IP: AllDRouters})
if err != nil {
log.Fatal(err)
}
}
err = r.SetControlMessage(ipv4.FlagDst|ipv4.FlagInterface, true)
if err != nil {
log.Fatal(err)
}
r.SetTOS(iana.DiffServCS6)
parseOSPFHeader := func(b []byte) *OSPFHeader {
if len(b) < OSPFHeaderLen {
return nil
}
return &OSPFHeader{
Version: b[0],
Type: b[1],
Len: uint16(b[2])<<8 | uint16(b[3]),
RouterID: uint32(b[4])<<24 | uint32(b[5])<<16 | uint32(b[6])<<8 | uint32(b[7]),
AreaID: uint32(b[8])<<24 | uint32(b[9])<<16 | uint32(b[10])<<8 | uint32(b[11]),
Checksum: uint16(b[12])<<8 | uint16(b[13]),
}
}
b := make([]byte, 1500)
for {
iph, p, _, err := r.ReadFrom(b)
if err != nil {
log.Fatal(err)
}
if iph.Version != ipv4.Version {
continue
}
if iph.Dst.IsMulticast() {
if !iph.Dst.Equal(AllSPFRouters) && !iph.Dst.Equal(AllDRouters) {
continue
}
}
ospfh := parseOSPFHeader(p)
if ospfh == nil {
continue
}
if ospfh.Version != OSPF_VERSION {
continue
}
switch ospfh.Type {
case OSPF_TYPE_HELLO:
case OSPF_TYPE_DB_DESCRIPTION:
case OSPF_TYPE_LS_REQUEST:
case OSPF_TYPE_LS_UPDATE:
case OSPF_TYPE_LS_ACK:
}
}
}
func TestRawConnReadWriteUnicastICMP(t *testing.T) {
switch runtime.GOOS {
case "nacl", "plan9", "solaris", "windows":
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", "0.0.0.0")
if err != nil {
t.Fatalf("net.ListenPacket failed: %v", err)
}
defer c.Close()
dst, err := net.ResolveIPAddr("ip4", "127.0.0.1")
if err != nil {
t.Fatalf("ResolveIPAddr failed: %v", err)
}
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatalf("ipv4.NewRawConn failed: %v", 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.Fatalf("icmp.Message.Marshal failed: %v", 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 protocolNotSupported(err) {
t.Skipf("not supported on %q", runtime.GOOS)
}
t.Fatalf("ipv4.RawConn.SetControlMessage failed: %v", err)
}
if err := r.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatalf("ipv4.RawConn.SetWriteDeadline failed: %v", err)
}
if err := r.WriteTo(wh, wb, nil); err != nil {
t.Fatalf("ipv4.RawConn.WriteTo failed: %v", err)
}
rb := make([]byte, ipv4.HeaderLen+128)
loop:
if err := r.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
t.Fatalf("ipv4.RawConn.SetReadDeadline failed: %v", err)
}
if _, b, cm, err := r.ReadFrom(rb); err != nil {
t.Fatalf("ipv4.RawConn.ReadFrom failed: %v", err)
} else {
t.Logf("rcvd cmsg: %v", cm)
m, err := icmp.ParseMessage(iana.ProtocolICMP, b)
if err != nil {
t.Fatalf("icmp.ParseMessage failed: %v", 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; expected 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 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()
dst, err := net.ResolveIPAddr("ip4", "224.0.0.254") // see RFC 4727
if err != nil {
t.Fatalf("ResolveIPAddr failed: %v", err)
}
r, err := ipv4.NewRawConn(c)
if err != nil {
t.Fatalf("ipv4.NewRawConn failed: %v", err)
}
defer r.Close()
if err := r.JoinGroup(ifi, dst); err != nil {
t.Fatalf("ipv4.RawConn.JoinGroup on %v failed: %v", ifi, err)
}
if err := r.SetMulticastInterface(ifi); err != nil {
t.Fatalf("ipv4.RawConn.SetMulticastInterface failed: %v", err)
}
if _, err := r.MulticastInterface(); err != nil {
t.Fatalf("ipv4.RawConn.MulticastInterface failed: %v", err)
}
if err := r.SetMulticastLoopback(true); err != nil {
t.Fatalf("ipv4.RawConn.SetMulticastLoopback failed: %v", err)
}
if _, err := r.MulticastLoopback(); err != nil {
t.Fatalf("ipv4.RawConn.MulticastLoopback failed: %v", 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.Fatalf("icmp.Message.Marshal failed: %v", err)
}
wh := &ipv4.Header{
Version: ipv4.Version,
Len: ipv4.HeaderLen,
TOS: i + 1,
TotalLen: ipv4.HeaderLen + len(wb),
Protocol: 1,
Dst: dst.IP,
}
if err := r.SetControlMessage(cf, toggle); err != nil {
if protocolNotSupported(err) {
t.Skipf("not supported on %q", runtime.GOOS)
}
t.Fatalf("ipv4.RawConn.SetControlMessage failed: %v", err)
}
if err := r.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil {
t.Fatalf("ipv4.RawConn.SetDeadline failed: %v", err)
}
r.SetMulticastTTL(i + 1)
if err := r.WriteTo(wh, wb, nil); err != nil {
t.Fatalf("ipv4.RawConn.WriteTo failed: %v", err)
}
rb := make([]byte, ipv4.HeaderLen+128)
if rh, b, cm, err := r.ReadFrom(rb); err != nil {
t.Fatalf("ipv4.RawConn.ReadFrom failed: %v", err)
} else {
t.Logf("rcvd cmsg: %v", cm)
m, err := icmp.ParseMessage(iana.ProtocolICMP, b)
if err != nil {
t.Fatalf("icmp.ParseMessage failed: %v", 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; expected type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0)
}
}
}
}
