Examples of java.net.Inet4Address

java.net.Inet4Address
etf.org/rfc/rfc790.txt"> RFC 790: Assigned Numbers, RFC 1918: Address Allocation for Private Internets, and RFC 2365: Administratively Scoped IP Multicast
Textual representation of IP addresses
Textual representation of IPv4 address used as input to methods takes one of the following forms:

d.d.d.d

d.d.d

d.d

d

When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an IPv4 address.
When a three part address is specified, the last part is interpreted as a 16-bit quantity and placed in the right most two bytes of the network address. This makes the three part address format convenient for specifying Class B net- work addresses as 128.net.host.
When a two part address is supplied, the last part is interpreted as a 24-bit quantity and placed in the right most three bytes of the network address. This makes the two part address format convenient for specifying Class A network addresses as net.host.
When only one part is given, the value is stored directly in the network address without any byte rearrangement.
For methods that return a textual representation as output value, the first form, i.e. a dotted-quad string, is used.
The Scope of a Multicast Address
Historically the IPv4 TTL field in the IP header has doubled as a multicast scope field: a TTL of 0 means node-local, 1 means link-local, up through 32 means site-local, up through 64 means region-local, up through 128 means continent-local, and up through 255 are global. However, the administrative scoping is preferred. Please refer to RFC 2365: Administratively Scoped IP Multicast @since 1.4

  public static TeredoInfo getTeredoInfo(Inet6Address ip) {
    Preconditions.checkArgument(isTeredoAddress(ip),
        "Address '%s' is not a Teredo address.", toAddrString(ip));


    byte[] bytes = ip.getAddress();
    Inet4Address server = getInet4Address(copyOfRange(bytes, 4, 8));


    int flags = ByteStreams.newDataInput(bytes, 8).readShort() & 0xffff;


    // Teredo obfuscates the mapped client port, per section 4 of the RFC.
    int port = ~ByteStreams.newDataInput(bytes, 10).readShort() & 0xffff;


    byte[] clientBytes = copyOfRange(bytes, 12, 16);
    for (int i = 0; i < clientBytes.length; i++) {
      // Teredo obfuscates the mapped client IP, per section 4 of the RFC.
      clientBytes[i] = (byte) ~clientBytes[i];
    }
    Inet4Address client = getInet4Address(clientBytes);


    return new TeredoInfo(server, client, port, flags);
  }

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            ret[0] = r.newString(addr.getCanonicalHostName());
            ret[1] = r.newArray();
            ret[3] = r.newString(addr.getHostAddress());
            
            if (addr instanceof Inet4Address) {
                Inet4Address addr4 = (Inet4Address)addr;
                ret[2] = r.newFixnum(RubySocket.AF_INET); //AF_INET
            } else if (addr instanceof Inet6Address) {
                Inet6Address addr6 = (Inet6Address)addr;
                ret[2] = r.newFixnum(RubySocket.AF_INET6); //AF_INET
            }

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  public static TeredoInfo getTeredoInfo(Inet6Address ip) {
    Preconditions.checkArgument(isTeredoAddress(ip),
        "Address '%s' is not a Teredo address.", toAddrString(ip));


    byte[] bytes = ip.getAddress();
    Inet4Address server = getInet4Address(Arrays.copyOfRange(bytes, 4, 8));


    int flags = ByteStreams.newDataInput(bytes, 8).readShort() & 0xffff;


    // Teredo obfuscates the mapped client port, per section 4 of the RFC.
    int port = ~ByteStreams.newDataInput(bytes, 10).readShort() & 0xffff;


    byte[] clientBytes = Arrays.copyOfRange(bytes, 12, 16);
    for (int i = 0; i < clientBytes.length; i++) {
      // Teredo obfuscates the mapped client IP, per section 4 of the RFC.
      clientBytes[i] = (byte) ~clientBytes[i];
    }
    Inet4Address client = getInet4Address(clientBytes);


    return new TeredoInfo(server, client, port, flags);
  }

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            socket.setBroadcast(true);
            socket.setNetworkInterface(NetworkInterface.getByName(deviceName));
            socket.setSoTimeout(RECEIVE_TIMEOUT);


            // Create the BOOTP header
            final Inet4Address myIP = null; // any address
            final int transactionID = (int) (System.currentTimeMillis() & 0xFFFFFFFF);
            BOOTPHeader hdr =
                    new BOOTPHeader(BOOTPHeader.BOOTREQUEST, transactionID, 0, myIP, hwAddress);


            // Send the packet

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        if (entry == null) {
            // no entry in table
            log.debug("No match for hardware address found in table");
            return;
        }
        Inet4Address yourIP = entry.address;
        hdr = new BOOTPHeader(
                BOOTPHeader.BOOTREPLY, hdr.getTransactionID(), hdr.getTimeElapsedSecs(), 
                hdr.getClientIPAddress(), yourIP, (Inet4Address) InetAddress.getLocalHost(), 
                hdr.getClientHwAddress());
        hdr.setBootFileName(entry.bootFileName);

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  public static TeredoInfo getTeredoInfo(Inet6Address ip) {
    Preconditions.checkArgument(isTeredoAddress(ip),
        "Address '%s' is not a Teredo address.", toAddrString(ip));


    byte[] bytes = ip.getAddress();
    Inet4Address server = getInet4Address(copyOfRange(bytes, 4, 8));


    int flags = ByteStreams.newDataInput(bytes, 8).readShort() & 0xffff;


    // Teredo obfuscates the mapped client port, per section 4 of the RFC.
    int port = ~ByteStreams.newDataInput(bytes, 10).readShort() & 0xffff;


    byte[] clientBytes = copyOfRange(bytes, 12, 16);
    for (int i = 0; i < clientBytes.length; i++) {
      // Teredo obfuscates the mapped client IP, per section 4 of the RFC.
      clientBytes[i] = (byte) ~clientBytes[i];
    }
    Inet4Address client = getInet4Address(clientBytes);


    return new TeredoInfo(server, client, port, flags);
  }

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            ret[0] = r.newString(do_not_reverse_lookup(recv).isTrue() ? addr.getHostAddress() : addr.getCanonicalHostName());
            ret[1] = r.newArray();
            ret[3] = r.newString(addr.getHostAddress());
            
            if (addr instanceof Inet4Address) {
                Inet4Address addr4 = (Inet4Address)addr;
                ret[2] = r.newFixnum(AF_INET); //AF_INET
            } else if (addr instanceof Inet6Address) {
                Inet6Address addr6 = (Inet6Address)addr;
                ret[2] = r.newFixnum(AF_INET6); //AF_INET
            }

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        }


        if (ipv4) {
            byte[] data = new byte[4];
            System.arraycopy(b, 12, data, 0, 4);
            Inet4Address addr;
            try {
                addr = (Inet4Address) InetAddress.getByAddress(data);
            } catch (UnknownHostException e) {
                throw new IllegalArgumentException();
            }
            return addr.getHostAddress();
        } else {
            Inet6Address addr;
            try {
                addr = (Inet6Address) InetAddress.getByAddress(b);
            } catch (UnknownHostException e) {
                throw new IllegalArgumentException();
            }
            return addr.getHostAddress();
        }
    }

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    InetAddress ip = InetAddresses.forString(ipStr);
    assertEquals("[3ffe::1]", InetAddresses.toUriString(ip));
  }


  public void testForUriStringIPv4() {
    Inet4Address expected = (Inet4Address) InetAddresses.forString("192.168.1.1");
    assertEquals(expected, InetAddresses.forUriString("192.168.1.1"));
  }

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    Inet6Address expected = (Inet6Address) InetAddresses.forString("3ffe:0:0:0:0:0:0:1");
    assertEquals(expected, InetAddresses.forUriString("[3ffe:0:0:0:0:0:0:1]"));
  }


  public void testForUriStringIPv4Mapped() {
    Inet4Address expected = (Inet4Address) InetAddresses.forString("192.0.2.1");
    assertEquals(expected, InetAddresses.forUriString("[::ffff:192.0.2.1]"));
  }

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Examples of java.net.Inet4Address

Textual representation of IP addresses

The Scope of a Multicast Address

Related Classes of java.net.Inet4Address