* **
* 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. * *
boolean indicating if the InetAddress is
* an IP multicast address
* @since JDK1.1
*/
public boolean isMulticastAddress() {
return ((holder().getAddress() & 0xf0000000) == 0xe0000000);
}
/**
* Utility routine to check if the InetAddress in a wildcard address.
* @return a boolean indicating if the Inetaddress is
* a wildcard address.
* @since 1.4
*/
public boolean isAnyLocalAddress() {
return holder().getAddress() == 0;
}
/**
* Utility routine to check if the InetAddress is a loopback address.
*
* @return a boolean indicating if the InetAddress is
* a loopback address; or false otherwise.
* @since 1.4
*/
private static final int loopback = 2130706433; /* 127.0.0.1 */
public boolean isLoopbackAddress() {
/* 127.x.x.x */
byte[] byteAddr = getAddress();
return byteAddr[0] == 127;
}
/**
* Utility routine to check if the InetAddress is an link local address.
*
* @return a boolean indicating if the InetAddress is
* a link local address; or false if address is not a link local unicast address.
* @since 1.4
*/
public boolean isLinkLocalAddress() {
// link-local unicast in IPv4 (169.254.0.0/16)
// defined in "Documenting Special Use IPv4 Address Blocks
// that have been Registered with IANA" by Bill Manning
// draft-manning-dsua-06.txt
int address = holder().getAddress();
return (((address >>> 24) & 0xFF) == 169)
&& (((address >>> 16) & 0xFF) == 254);
}
/**
* Utility routine to check if the InetAddress is a site local address.
*
* @return a boolean indicating if the InetAddress is
* a site local address; or false if address is not a site local unicast address.
* @since 1.4
*/
public boolean isSiteLocalAddress() {
// refer to RFC 1918
// 10/8 prefix
// 172.16/12 prefix
// 192.168/16 prefix
int address = holder().getAddress();
return (((address >>> 24) & 0xFF) == 10)
|| ((((address >>> 24) & 0xFF) == 172)
&& (((address >>> 16) & 0xF0) == 16))
|| ((((address >>> 24) & 0xFF) == 192)
&& (((address >>> 16) & 0xFF) == 168));
}
/**
* Utility routine to check if the multicast address has global scope.
*
* @return a boolean indicating if the address has
* is a multicast address of global scope, false if it is not
* of global scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCGlobal() {
// 224.0.1.0 to 238.255.255.255
byte[] byteAddr = getAddress();
return ((byteAddr[0] & 0xff) >= 224 && (byteAddr[0] & 0xff) <= 238 ) &&
!((byteAddr[0] & 0xff) == 224 && byteAddr[1] == 0 &&
byteAddr[2] == 0);
}
/**
* Utility routine to check if the multicast address has node scope.
*
* @return a boolean indicating if the address has
* is a multicast address of node-local scope, false if it is not
* of node-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCNodeLocal() {
// unless ttl == 0
return false;
}
/**
* Utility routine to check if the multicast address has link scope.
*
* @return a boolean indicating if the address has
* is a multicast address of link-local scope, false if it is not
* of link-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCLinkLocal() {
// 224.0.0/24 prefix and ttl == 1
int address = holder().getAddress();
return (((address >>> 24) & 0xFF) == 224)
&& (((address >>> 16) & 0xFF) == 0)
&& (((address >>> 8) & 0xFF) == 0);
}
/**
* Utility routine to check if the multicast address has site scope.
*
* @return a boolean indicating if the address has
* is a multicast address of site-local scope, false if it is not
* of site-local scope or it is not a multicast address
* @since 1.4
*/
public boolean isMCSiteLocal() {
// 239.255/16 prefix or ttl < 32
int address = holder().getAddress();
return (((address >>> 24) & 0xFF) == 239)
&& (((address >>> 16) & 0xFF) == 255);
}
/**
* Utility routine to check if the multicast address has organization scope.
*
* @return a boolean indicating if the address has
* is a multicast address of organization-local scope,
* false if it is not of organization-local scope
* or it is not a multicast address
* @since 1.4
*/
public boolean isMCOrgLocal() {
// 239.192 - 239.195
int address = holder().getAddress();
return (((address >>> 24) & 0xFF) == 239)
&& (((address >>> 16) & 0xFF) >= 192)
&& (((address >>> 16) & 0xFF) <= 195);
}
/**
* Returns the raw IP address of this InetAddress
* object. The result is in network byte order: the highest order
* byte of the address is in getAddress()[0].
*
* @return the raw IP address of this object.
*/
public byte[] getAddress() {
int address = holder().getAddress();
byte[] addr = new byte[INADDRSZ];
addr[0] = (byte) ((address >>> 24) & 0xFF);
addr[1] = (byte) ((address >>> 16) & 0xFF);
addr[2] = (byte) ((address >>> 8) & 0xFF);
addr[3] = (byte) (address & 0xFF);
return addr;
}
/**
* Returns the IP address string in textual presentation form.
*
* @return the raw IP address in a string format.
* @since JDK1.0.2
*/
public String getHostAddress() {
return numericToTextFormat(getAddress());
}
/**
* Returns a hashcode for this IP address.
*
* @return a hash code value for this IP address.
*/
public int hashCode() {
return holder().getAddress();
}
/**
* Compares this object against the specified object.
* The result is true if and only if the argument is
* not null and it represents the same IP address as
* this object.
*
* Two instances of InetAddress represent the same IP
* address if the length of the byte arrays returned by
* getAddress is the same for both, and each of the
* array components is the same for the byte arrays.
*
* @param obj the object to compare against.
* @return true if the objects are the same;
* false otherwise.
* @see java.net.InetAddress#getAddress()
*/
public boolean equals(Object obj) {
return (obj != null) && (obj instanceof Inet4Address) &&
(((InetAddress)obj).holder().getAddress() == holder().getAddress());
}
// Utilities
/*
* Converts IPv4 binary address into a string suitable for presentation.
*
* @param src a byte array representing an IPv4 numeric address
* @return a String representing the IPv4 address in
* textual representation format
* @since 1.4
*/
static String numericToTextFormat(byte[] src)
{
return (src[0] & 0xff) + "." + (src[1] & 0xff) + "." + (src[2] & 0xff) + "." + (src[3] & 0xff);
}
/**
* Perform class load-time initializations.
*/
private static native void init();
}