vacmmib.java

你个snmp的源码

   *    the security level
   * @param match
   *    indicates whether exact context match ({@link #vacmExactMatch})
   *    or prefix context match ({@link #vacmPrefixMatch}) should
   *    be used by the new entry.
   * @param readView
   *    the view name for read access (use a zero length OctetString to disable
   *    access).
   * @param writeView
   *    the view name for write access (use a zero length OctetString to disable
   *    access).
   * @param notifyView
   *    the view name for notify access (use a zero length OctetString to
   *    disable access).
   * @param storageType
   *    the {@link StorageType} for this access entry.
   */
  public void addAccess(OctetString groupName, OctetString contextPrefix,
                        int securityModel, int securityLevel,
                        int match,
                        OctetString readView, OctetString writeView,
                        OctetString notifyView, int storageType) {
    OID index = createAccessIndex(groupName, contextPrefix, securityModel,
                                  securityLevel);
    Variable[] values = new Variable[vacmAccessTable.getColumnCount()];
    values[idxVacmAccessContextMatch] = new Integer32(match);
    values[idxVacmAccessReadViewName] = readView;
    values[idxVacmAccessWriteViewName] = writeView;
    values[idxVacmAccessNotifyViewName] = notifyView;
    values[idxVacmAccessStorageType] = new Integer32(storageType);
    values[idxVacmAccessRowStatus] = new Integer32(RowStatus.active);
    vacmAccessTableModel.addRow(vacmAccessTableModel.createRow(index, values));
  }

  /**
   * Removes an access entry from this VACM.
   * @param groupName
   *    the group for which access rights are to be added.
   * @param contextPrefix
   *    the context or context prefix.
   * @param securityModel
   *    the security model
   * @param securityLevel
   *    the security level
   * @return
   *    <code>true</code> when the entry has been removed or <code>false</code>
   *    if no such entry could be found.
   */
  public boolean removeAccess(OctetString groupName, OctetString contextPrefix,
                              int securityModel, int securityLevel) {
    OID index = createAccessIndex(groupName, contextPrefix, securityModel,
                                  securityLevel);
    return (vacmAccessTableModel.removeRow(index) != null);
  }

  private static OID createAccessIndex(OctetString groupName,
                                       OctetString contextPrefix,
                                       int securityModel, int securityLevel) {
    OID index = groupName.toSubIndex(false);
    index.append(contextPrefix.toSubIndex(false));
    index.append(securityModel);
    index.append(securityLevel);
    return index;
  }

  /**
   * Adds a new view to this VACM. An already existing entry with the same
   * view name and subtree OID will be replaced silently.
   * @param viewName
   *    the view name.
   * @param subtree
   *    the subtree OID.
   * @param mask
   *    the bit mask which, in combination with <code>subtree</code>,
   *    defines a family of view subtrees.
   * @param type
   *    indicates whether the view defined by <code>subtree</code> and
   *    <code>mask</code> is included ({@link #vacmViewIncluded}) or excluded
   *    (@link #vacmViewExcluded}) from the MIB view.
   * @param storageType
   *    the {@link StorageType} for this access entry.
   */
  public void addViewTreeFamily(OctetString viewName, OID subtree,
                                OctetString mask, int type, int storageType) {
    OID index = createViewIndex(viewName, subtree);
    Variable[] values = new Variable[vacmViewTreeFamilyTable.getColumnCount()];
    values[idxVacmViewTreeFamilyMask] = mask;
    values[idxVacmViewTreeFamilyType] = new Integer32(type);
    values[idxVacmViewTreeFamilyStorageType] = new Integer32(storageType);
    values[idxVacmViewTreeFamilyRowStatus] = new Integer32(RowStatus.active);
    MOTableRow row = vacmViewTreeFamilyTableModel.createRow(index, values);
    vacmViewTreeFamilyTableModel.addRow(row);
  }

  /**
   * Removes a view tree family from this VACM.
   * @param viewName
   *    the view name.
   * @param subtree
   *    the subtree OID.
   * @return
   *    <code>true</code> when the entry has been removed or <code>false</code>
   *    if no such entry could be found.
   */
  public boolean removeViewTreeFamily(OctetString viewName, OID subtree) {
    OID index = createViewIndex(viewName, subtree);
    return (vacmViewTreeFamilyTableModel.removeRow(index) != null);
  }

  private static OID createViewIndex(OctetString viewName, OID subtree) {
    OID index = viewName.toSubIndex(false);
    index.append(subtree.toSubIndex(false));
    return index;
  }

  /**
   * Checks whether bit n of the supplied OctetString is set or not.
   * @param n
   *    denotes the bit to check starting from zero.
   * @param os OctetString
   * @return boolean
   */
  private static boolean isBitSet(final int n, final OctetString os) {
    if (os.length() <= n/8) {
      return true;
    }
    return (os.get(n/8) & (0x01 << (7 - (n % 8)))) > 0;
  }

  private List getAccessEntries(OctetString groupName) {
    OctetString upperBound = new OctetString(groupName);
    byte last = -1;
    if (upperBound.length() > 0) {
      last = upperBound.get(upperBound.length() - 1);
    }
    if (last == -1) {
      upperBound.append((byte)0);
    }
    else {
      upperBound.set(upperBound.length()-1, (byte)(last+1));
    }
    OID lowerOID = groupName.toSubIndex(false);
    OID upperOID = upperBound.toSubIndex(false);
    List views = vacmAccessTableModel.getRows(lowerOID, upperOID);
    return views;
  }

  private List getViews(OctetString viewName) {
    OctetString upperBound = new OctetString(viewName);
    byte last = upperBound.get(upperBound.length()-1);
    if (last == -1) {
      upperBound.append((byte)0);
    }
    else {
      upperBound.set(upperBound.length()-1, (byte)(last+1));
    }
    OID lowerOID = viewName.toSubIndex(false);
    OID upperOID = upperBound.toSubIndex(false);
    List views = vacmViewTreeFamilyTableModel.getRows(lowerOID, upperOID);
    return views;
  }

  public static class VacmContextIterator implements Iterator {

    private int index = 0;
    private OctetString[] contexts;

    VacmContextIterator(OctetString[] contexts, int offset) {
      this.contexts = contexts;
      this.index = offset;
    }

    public void remove() {
      throw new UnsupportedOperationException();
    }

    public boolean hasNext() {
      return (index < contexts.length);
    }

    public Object next() {
      if (index < contexts.length) {
        OctetString context = contexts[index++];
        DefaultMOTableRow row =
            new DefaultMOTableRow(context.toSubIndex(false),
                                  new Variable[] { context });
        return row;
      }
      throw new NoSuchElementException();
    }

  }

  private static OctetString getContextFromIndex(OID index) {
    if (index.size() > 0) {
      return new OctetString(index.toByteArray(), 1, index.size() - 1);
    }
    return new OctetString();
  }


  class VacmContextTableModel implements MOTableModel {

    public int getColumnCount() {
      return 1;
    }

    public int getRowCount() {
      return server.getContexts().length;
    }

    public boolean containsRow(OID index) {
      return server.isContextSupported(getContextFromIndex(index));
    }

    public MOTableRow getRow(OID index) {
      if (index == null) {
        return null;
      }
      OctetString context = getContextFromIndex(index);
      if (server.isContextSupported(context)) {
        DefaultMOTableRow row =
            new DefaultMOTableRow(index, new Variable[] { context });
        return row;
      }
      return null;
    }

    public Iterator iterator() {
      return tailIterator(new OID());
    }

    public Iterator tailIterator(OID lowerBound) {
      OctetString[] contexts = server.getContexts();
      if (contexts == null) {
        return new VacmContextIterator(new OctetString[0], 0);
      }
      Arrays.sort(contexts, new LexicographicOctetStringComparator());
      int offset = 0;
      if (lowerBound != null) {
        offset = Arrays.binarySearch(contexts, getContextFromIndex(lowerBound));
      }
      if (offset < 0) {
        offset = -(offset+1);
      }
      return new VacmContextIterator(contexts, offset);
    }

    public OID lastIndex() {
      OctetString[] contexts = server.getContexts();
      if ((contexts == null) || (contexts.length == 0)) {
        return null;
      }
      Arrays.sort(contexts, new LexicographicOctetStringComparator());
      return contexts[contexts.length-1].toSubIndex(false);
    }

    public OID firstIndex() {
      OctetString[] contexts = server.getContexts();
      if ((contexts == null) || (contexts.length > 0)) {
        return null;
      }
      Arrays.sort(contexts, new LexicographicOctetStringComparator());
      return contexts[0].toSubIndex(false);
    }

    public MOTableRow firstRow() {
      return getRow(firstIndex());
    }

    public MOTableRow lastRow() {
      return getRow(lastIndex());
    }
  }

}