Golang ICMPFilter.Set方法代码示例

func TestSetICMPFilter(t *testing.T) {
	switch runtime.GOOS {
	case "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.Fatalf("net.ListenPacket failed: %v", err)
	}
	defer c.Close()

	p := ipv6.NewPacketConn(c)

	var f ipv6.ICMPFilter
	f.SetAll(true)
	f.Set(ipv6.ICMPTypeEchoRequest, false)
	f.Set(ipv6.ICMPTypeEchoReply, false)
	if err := p.SetICMPFilter(&f); err != nil {
		t.Fatalf("ipv6.PacketConn.SetICMPFilter failed: %v", err)
	}
	kf, err := p.ICMPFilter()
	if err != nil {
		t.Fatalf("ipv6.PacketConn.ICMPFilter failed: %v", err)
	}
	if !reflect.DeepEqual(kf, &f) {
		t.Fatalf("got unexpected filter %#v; expected %#v", kf, f)
	}
}

func TestICMPFilter(t *testing.T) {
	switch runtime.GOOS {
	case "plan9", "solaris", "windows":
		t.Skipf("not supported on %q", runtime.GOOS)
	}

	var f ipv6.ICMPFilter
	for _, toggle := range []bool{false, true} {
		f.SetAll(toggle)
		var wg sync.WaitGroup
		for _, typ := range []ipv6.ICMPType{
			ipv6.ICMPTypeDestinationUnreachable,
			ipv6.ICMPTypeEchoReply,
			ipv6.ICMPTypeNeighborSolicitation,
			ipv6.ICMPTypeDuplicateAddressConfirmation,
		} {
			wg.Add(1)
			go func(typ ipv6.ICMPType) {
				defer wg.Done()
				f.Set(typ, false)
				if f.WillBlock(typ) {
					t.Errorf("ipv6.ICMPFilter.Set(%v, false) failed", typ)
				}
				f.Set(typ, true)
				if !f.WillBlock(typ) {
					t.Errorf("ipv6.ICMPFilter.Set(%v, true) failed", typ)
				}
			}(typ)
		}
		wg.Wait()
	}
}

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.Set(ipv6.ICMPTypeEchoReply, false)
	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)
			}
		}
//.........这里部分代码省略.........

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 %q", 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")
	}
	ifi := nettest.RoutedInterface("ip6", net.FlagUp|net.FlagMulticast|net.FlagLoopback)
	if ifi == nil {
		t.Skipf("not available on %q", 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 %q", 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.Set(ipv6.ICMPTypeEchoReply, false)
		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.Logf("not supported on %q", runtime.GOOS)
//.........这里部分代码省略.........

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.Set(ipv6.ICMPTypeTimeExceeded, false)
	f.Set(ipv6.ICMPTypeEchoReply, false)
	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 TestPacketConnReadWriteMulticastICMP(t *testing.T) {
	switch runtime.GOOS {
	case "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")
	}
	ifi := loopbackInterface()
	if ifi == nil {
		t.Skipf("not available on %q", runtime.GOOS)
	}

	c, err := net.ListenPacket("ip6:ipv6-icmp", "::")
	if err != nil {
		t.Fatalf("net.ListenPacket failed: %v", err)
	}
	defer c.Close()

	dst, err := net.ResolveIPAddr("ip6", "ff02::114") // see RFC 4727
	if err != nil {
		t.Fatalf("net.ResolveIPAddr failed: %v", err)
	}

	pshicmp := ipv6PseudoHeader(c.LocalAddr().(*net.IPAddr).IP, dst.IP, ianaProtocolIPv6ICMP)
	p := ipv6.NewPacketConn(c)
	defer p.Close()
	if err := p.JoinGroup(ifi, dst); err != nil {
		t.Fatalf("ipv6.PacketConn.JoinGroup on %v failed: %v", ifi, err)
	}
	if err := p.SetMulticastInterface(ifi); err != nil {
		t.Fatalf("ipv6.PacketConn.SetMulticastInterface failed: %v", err)
	}
	if _, err := p.MulticastInterface(); err != nil {
		t.Fatalf("ipv6.PacketConn.MulticastInterface failed: %v", err)
	}
	if err := p.SetMulticastLoopback(true); err != nil {
		t.Fatalf("ipv6.PacketConn.SetMulticastLoopback failed: %v", err)
	}
	if _, err := p.MulticastLoopback(); err != nil {
		t.Fatalf("ipv6.PacketConn.MulticastLoopback failed: %v", err)
	}

	cm := ipv6.ControlMessage{
		TrafficClass: DiffServAF11 | 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.Set(ipv6.ICMPTypeEchoReply, false)
	if err := p.SetICMPFilter(&f); err != nil {
		t.Fatalf("ipv6.PacketConn.SetICMPFilter failed: %v", 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.Fatalf("ipv6.PacketConn.SetChecksum failed: %v", err)
			}
		} else {
			psh = pshicmp
			// Some platforms never allow to disable the
			// kernel checksum processing.
			p.SetChecksum(false, -1)
		}
		wb, err := (&icmpMessage{
			Type: ipv6.ICMPTypeEchoRequest, Code: 0,
			Body: &icmpEcho{
				ID: os.Getpid() & 0xffff, Seq: i + 1,
				Data: []byte("HELLO-R-U-THERE"),
			},
		}).Marshal(psh)
		if err != nil {
			t.Fatalf("icmpMessage.Marshal failed: %v", err)
		}
		if err := p.SetControlMessage(cf, toggle); err != nil {
			t.Fatalf("ipv6.PacketConn.SetControlMessage failed: %v", err)
		}
		if err := p.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil {
			t.Fatalf("ipv6.PacketConn.SetDeadline failed: %v", err)
		}
		cm.HopLimit = i + 1
		if n, err := p.WriteTo(wb, &cm, dst); err != nil {
			t.Fatalf("ipv6.PacketConn.WriteTo failed: %v", err)
		} else if n != len(wb) {
			t.Fatalf("ipv6.PacketConn.WriteTo failed: short write: %v", n)
		}
		rb := make([]byte, 128)
		if n, cm, _, err := p.ReadFrom(rb); err != nil {
			t.Fatalf("ipv6.PacketConn.ReadFrom failed: %v", err)
		} else {
			t.Logf("rcvd cmsg: %v", cm)
//.........这里部分代码省略.........