Package jcifs.netbios

Class NbtAddress

  • All Implemented Interfaces:
    Address, NetbiosAddress
    public final class NbtAddress
extends Object
implements NetbiosAddress
    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 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 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.

    Since:
    jcifs-0.1
    Author:
    Michael B. Allen
    See Also:
    InetAddress

    • Field Detail

      • ANY_HOSTS_NAME

        public static final String ANY_HOSTS_NAME
        This is a special name that means all hosts. If you wish to find all hosts on a network querying a workgroup group name is the preferred method.
        See Also:
        Constant Field Values

      • 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".
        See Also:
        Constant Field Values

      • 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.
        See Also:
        Constant Field Values

      • 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.
        See Also:
        Constant Field Values

      • 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.
        See Also:
        Constant Field Values

      • M_NODE

        public static final int M_NODE
        Try Broadcast queries first, then try to resolve the name using the nameserver.
        See Also:
        Constant Field Values

      • 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.
        See Also:
        Constant Field Values

      • UNKNOWN_MAC_ADDRESS

        public static final byte[] UNKNOWN_MAC_ADDRESS
        Unknown MAC Address

    • Method Detail

      • firstCalledName

        public String firstCalledName()
        Guess next called name to try for session establishment. These methods are used by the smb package.
        Specified by:
        firstCalledName in interface Address
        Returns:
        guessed name

      • nextCalledName

        public String nextCalledName​(CIFSContext tc)
        Description copied from interface: Address
        Guess next called name to try for session establishment. These methods are used by the smb package.
        Specified by:
        nextCalledName in interface Address
        Parameters:
        tc - context to use
        Returns:
        net name to try

      • isGroupAddress

        public boolean isGroupAddress​(CIFSContext tc)
                       throws UnknownHostException
        Description copied from interface: NetbiosAddress
        Determines if the address is a group address. This is also known as a workgroup name or group name.
        Specified by:
        isGroupAddress in interface NetbiosAddress
        Parameters:
        tc - context to use
        Returns:
        whether the given address is a group address
        Throws:
        UnknownHostException - if the host cannot be resolved to find out.

      • getMacAddress

        public byte[] getMacAddress​(CIFSContext tc)
                     throws UnknownHostException
        Description copied from interface: NetbiosAddress
        Retrieves the MAC address of the remote network interface. Samba returns all zeros.
        Specified by:
        getMacAddress in interface NetbiosAddress
        Parameters:
        tc - context to use
        Returns:
        the MAC address as an array of six bytes
        Throws:
        UnknownHostException - if the host cannot be resolved to determine the MAC address.

      • getHostName

        public String getHostName()
        The hostname of this address. If the hostname is null the local machines IP address is returned.
        Specified by:
        getHostName in interface Address
        Returns:
        the text representation of the hostname associated with this address

      • 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].
        Returns:
        a four byte array

      • getHostAddress

        public String getHostAddress()
        Returns this IP adress as a String in the form "%d.%d.%d.%d".
        Specified by:
        getHostAddress in interface Address
        Returns:
        string representation of the IP address

      • getNameType

        public int getNameType()
        Description copied from interface: NetbiosAddress
        Returned the hex code associated with this name(e.g. 0x20 is for the file service)
        Specified by:
        getNameType in interface NetbiosAddress
        Returns:
        the name type

      • 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.
        Overrides:
        hashCode in class Object

      • 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.
        Overrides:
        equals in class Object