content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.cassandra.auth;
  
  import java.net.Inet6Address;
  import java.net.InetAddress;
  import java.util.Set;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.cql3.CIDR;
  import org.apache.cassandra.cql3.UntypedResultSet;
  import org.apache.cassandra.utils.Pair;
  
  /**
   * Reads the table {@link AuthKeyspace#CIDR_GROUPS} and populates CIDR groups mapping data structures.
   * Maintains separate mappings for IPv4 and IPv6 CIDRs
   */
  public class CIDRGroupsMappingLoader
  {
      private static final Logger logger = LoggerFactory.getLogger(CIDRGroupsMappingLoader.class);
  
      CIDRGroupsMappingTable.Builder<String> ipv4CidrGroupsTableBuilder = CIDRGroupsMappingTable.builder(false);
      CIDRGroupsMappingTable.Builder<String> ipv6CidrGroupsTableBuilder = CIDRGroupsMappingTable.builder(true);
  
      // Maintain separate mappings for IPv4 and IPv6 CIDRs
      private CIDRGroupsMappingTable<String> ipv4CidrGroupsTable = null;
      private CIDRGroupsMappingTable<String> ipv6CidrGroupsTable = null;
  
      protected CIDRGroupsMappingManager cidrGroupsMappingManager;
  
      public CIDRGroupsMappingLoader(CIDRGroupsMappingManager cidrGroupsMappingManager)
      {
          this.cidrGroupsMappingManager = cidrGroupsMappingManager;
  
          populateCidrGroupsMapping();
      }
  
      private void populateCidrGroupsMapping()
      {
          UntypedResultSet rows = cidrGroupsMappingManager.getCidrGroupsTableEntries();
          for (UntypedResultSet.Row row : rows)
          {
              String cidrGroupName = row.getString("cidr_group");
              Set<Pair<InetAddress, Short>> cidrs = cidrGroupsMappingManager.retrieveCidrsFromRow(row);
  
              for (Pair<InetAddress, Short> cidr : cidrs)
              {
                  try
                  {
                      CIDR validCidr = new CIDR(cidr.left(), cidr.right);
                      if (validCidr.isIPv6())
                          ipv6CidrGroupsTableBuilder.add(validCidr, cidrGroupName);
                      else
                          ipv4CidrGroupsTableBuilder.add(validCidr, cidrGroupName);
                  }
                  catch (RuntimeException e)
                  {
                      // We should not have this scenario after introducing CIDR cql datatype which ensures
                      // invalid CIDRs can't be inserted into the table using insert/update cql commands
                      logger.error("Invalid CIDR {} found in the table, ignoring this entry", cidr);
                  }
              }
          }
  
          ipv4CidrGroupsTable = ipv4CidrGroupsTableBuilder.build();
          ipv6CidrGroupsTable = ipv6CidrGroupsTableBuilder.build();
      }
  
      public Set<String> lookupCidrGroupsCacheForIp(InetAddress ipAddr)
      {
          // Based on the incoming IP format, lookup in appropriate CIDR groups mapping
          if (ipAddr instanceof Inet6Address)
              return ipv6CidrGroupsTable.lookupLongestMatchForIP(ipAddr);
          else
              return ipv4CidrGroupsTable.lookupLongestMatchForIP(ipAddr);
      }
  }
  