This class represents a NetBIOS over TCP/IP address. Under normal
conditions, users of jCIFS need not be concerned with this class as
name resolution and session services are handled internally by the smb package.
Applications can use the methods
getLocalHost
,
getByName
, and
getAllByAddress
to create a new NbtAddress instance. This
class is symmetric with
java.net.InetAddress
.
About NetBIOS: The NetBIOS name
service is a dynamic distributed service that allows hosts to resolve
names by broadcasting a query, directing queries to a server such as
Samba or WINS. NetBIOS is currently the primary networking layer for
providing name service, datagram service, and session service to the
Microsoft Windows platform. A NetBIOS name can be 15 characters long
and hosts usually registers several names on the network. From a
Windows command prompt you can see
what names a host registers with the nbtstat command.
C:\>nbtstat -a 192.168.1.15
NetBIOS Remote Machine Name Table
Name Type Status
---------------------------------------------
JMORRIS2 <00> UNIQUE Registered
BILLING-NY <00> GROUP Registered
JMORRIS2 <03> UNIQUE Registered
JMORRIS2 <20> UNIQUE Registered
BILLING-NY <1E> GROUP Registered
JMORRIS <03> UNIQUE Registered
MAC Address = 00-B0-34-21-FA-3B
The hostname of this machine is
JMORRIS2
. It is
a member of the group(a.k.a workgroup and domain)
BILLING-NY
. To
obtain an
java.net.InetAddress
for a host one might do:
InetAddress addr = NbtAddress.getByName( "jmorris2" ).getInetAddress();
From a UNIX platform with Samba installed you can perform similar
diagnostics using the
nmblookup
utility.
B_NODE
public static final int B_NODE
A B node only broadcasts name queries. This is the default if a
nameserver such as WINS or Samba is not specified.
H_NODE
public static final int H_NODE
A Hybrid node tries to resolve a name using the nameserver first. If
that fails use the broadcast address. This is the default if a nameserver
is provided. This is the behavior of Microsoft Windows machines.
MASTER_BROWSER_NAME
public static final String MASTER_BROWSER_NAME
This is a special name for querying the master browser that serves the
list of hosts found in "Network Neighborhood".
M_NODE
public static final int M_NODE
Try Broadcast queries first, then try to resolve the name using the
nameserver.
P_NODE
public static final int P_NODE
A Point-to-Point node, or P node, unicasts queries to a nameserver
only. Natrually the jcifs.netbios.nameserver
property must
be set.
SMBSERVER_NAME
public static final String SMBSERVER_NAME
A special generic name specified when connecting to a host for which
a name is not known. Not all servers respond to this name.
equals
public boolean equals(Object obj)
Determines if this address is equal two another. Only the IP Addresses
are compared. Similar to the
hashCode()
method, the comparison
is based on the integer IP address and not the string representation.
firstCalledName
public String firstCalledName()
getAddress
public byte[] getAddress()
Returns the raw IP address of this NbtAddress. The result is in network
byte order: the highest order byte of the address is in getAddress()[0].
getAllByAddress
public static NbtAddress[] getAllByAddress(String host)
throws UnknownHostException
Retrieve all addresses of a host by it's address. NetBIOS hosts can
have many names for a given IP address. The name and IP address make the
NetBIOS address. This provides a way to retrieve the other names for a
host with the same IP address.
host
- hostname to lookup all addresses for
getAllByAddress
public static NbtAddress[] getAllByAddress(String host,
int type,
String scope)
throws UnknownHostException
Retrieve all addresses of a host by it's address. NetBIOS hosts can
have many names for a given IP address. The name and IP address make
the NetBIOS address. This provides a way to retrieve the other names
for a host with the same IP address. See getByName
for a description of type
and scope
.
host
- hostname to lookup all addresses fortype
- the hexcode of the namescope
- the scope of the name
getAllByAddress
public static NbtAddress[] getAllByAddress(NbtAddress addr)
throws UnknownHostException
Retrieve all addresses of a host by it's address. NetBIOS hosts can
have many names for a given IP address. The name and IP address make the
NetBIOS address. This provides a way to retrieve the other names for a
host with the same IP address.
addr
- the address to query
getAllByName
public static NbtAddress[] getAllByName(String host,
int type,
String scope,
InetAddress svr)
throws UnknownHostException
getByName
public static NbtAddress getByName(String host)
throws UnknownHostException
Determines the address of a host given it's host name. The name can be a NetBIOS name like
"freto" or an IP address like "192.168.1.15". It cannot be a DNS name;
the analygous
UniAddress
or
java.net.InetAddress
getByName
methods can be used for that.
host
- hostname to resolve
getByName
public static NbtAddress getByName(String host,
int type,
String scope)
throws UnknownHostException
Determines the address of a host given it's host name. NetBIOS
names also have a
type
. Types(aka Hex Codes)
are used to distiquish the various services on a host.
Here is
a fairly complete list of NetBIOS hex codes. Scope is not used but is
still functional in other NetBIOS products and so for completeness it has been
implemented. A
scope
of
null
or
""
signifies no scope.
host
- the name to resolvetype
- the hex code of the namescope
- the scope of the name
getByName
public static NbtAddress getByName(String host,
int type,
String scope,
InetAddress svr)
throws UnknownHostException
getHostAddress
public String getHostAddress()
Returns this IP adress as a java.lang.String
in the form "%d.%d.%d.%d".
getHostName
public String getHostName()
The hostname of this address. If the hostname is null the local machines
IP address is returned.
- the text representation of the hostname associated with this address
getInetAddress
public InetAddress getInetAddress()
throws UnknownHostException
To convert this address to an InetAddress
.
- the
java.net.InetAddress
representation of this address.
getLocalHost
public static NbtAddress getLocalHost()
throws UnknownHostException
Retrieves the local host address.
getLocalName
public static Name getLocalName()
getMacAddress
public byte[] getMacAddress()
throws UnknownHostException
Retrieves the MAC address of the remote network interface. Samba returns all zeros.
- the MAC address as an array of six bytes
getNameType
public int getNameType()
Returned the hex code associated with this name(e.g. 0x20 is for the file service)
getNodeType
public int getNodeType()
throws UnknownHostException
Checks the node type of this address.
getWINSAddress
public static InetAddress getWINSAddress()
hashCode
public int hashCode()
Returns a hashcode for this IP address. The hashcode comes from the IP address
and is not generated from the string representation. So because NetBIOS nodes
can have many names, all names associated with an IP will have the same
hashcode.
isActive
public boolean isActive()
throws UnknownHostException
Determines if this address is active.
isBeingDeleted
public boolean isBeingDeleted()
throws UnknownHostException
Determines if this address in the process of being deleted.
isGroupAddress
public boolean isGroupAddress()
throws UnknownHostException
Determines if the address is a group address. This is also
known as a workgroup name or group name.
isInConflict
public boolean isInConflict()
throws UnknownHostException
Determines if this address in conflict with another address.
isPermanent
public boolean isPermanent()
throws UnknownHostException
Determines if this address is set to be permanent.
isWINS
public static boolean isWINS(InetAddress svr)
nextCalledName
public String nextCalledName()
toString
public String toString()
Returns the java.lang.String
representaion of this address.