module fujitsu-dns-resolver {

    yang-version 1;

    namespace
      "urn:fujitsu:params:xml:ns:yang:dnsresolver";

    prefix dnsresolver;

    import ietf-inet-types {
      prefix inet;
    }

    organization "Fujitsu Ltd.";

    contact
      "Fujitsu Ltd.
     
     Address: 2801 Telecom Parkway
              Richardson, Texas 75082
     
     Tel: +1-800-USE-FTAC (1-800-873-3822)
     Email: ftac@fnc.fujitsu.com
     Web: www.fujitsu.com/us/services/telecom";

    description
      "This module is used to control dns remove speciific user security defaults and systemwide
     leafs based on security features that are not supported on a specific product. 
     Copyright (c) 2015 Fujitsu Ltd.
     All rights reserved.
     
     The content of the this yang model was mostly taken from the
     ietf-system.yang module, 
     http://www.netconfcentral.org/modules/ietf-system
     The copyright statement from this file is included here:
     
     Copyright (c) 2014 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.
     
     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject
     to the license terms contained in, the Simplified BSD License
     set forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (http://trustee.ietf.org/license-info).
     
     This version of this YANG module is part of RFC 7317; see
     the RFC itself for full legal notices.";

    revision "2015-08-26";

    container dns-resolver {
      description
        "Configuration of the DNS resolver.";
      leaf-list search {
        type inet:domain-name;
        ordered-by user;
        description
          "An ordered list of domains to search when resolving
         a host name.";
      }

      list server {
        key "name";
        unique "address";
        max-elements 2;
        ordered-by user;
        description
          "List of the DNS servers that the resolver should query.
         When the resolver is invoked by a calling application, it
         sends the query to the first name server in this list.  If
         no response has been received within 'timeout' seconds,
           the resolver continues with the next server in the list.
             If no response is received from any server, the resolver
             continues with the first server again.  When the resolver
             has traversed the list 'attempts' times without receiving
             any response, it gives up and returns an error to the
             calling application.
             Implementations MAY limit the number of entries in this
             list.";
        leaf name {
          type string;
          description
            "An arbitrary name for the DNS server.";
        }

        leaf address {
          type inet:ip-address;
          mandatory true;
          description
            "The address of the DNS server.";
        }

        leaf port {
          type inet:port-number;
          default "53";
          description
            "The UDP and TCP port number of the DNS server.";
        }
      }  // list server

      container options {
        description
          "Resolver options.  The set of available options has been
         limited to those that are generally available across
         different resolver implementations and generally useful.";
        leaf timeout {
          type uint8 {
            range "1..30";
          }
          units "seconds";
          default "5";
          description
            "The amount of time the resolver will wait for a
           response from each remote name server before
           retrying the query via a different name server.";
        }

        leaf attempts {
          type uint8 {
            range "1..5";
          }
          default "2";
          description
            "The number of times the resolver will send a query to
           all of its name servers before giving up and returning
           an error to the calling application.";
        }

        leaf cache-age-timer {
          type uint32 {
            range "1..max";
          }
          units "seconds";
          default "86400";
          description
            "The number of seconds (time to live/TTL) resolved entries
           will live in the DNS cache. After timer expires, the cache
           will auto-flush stale entries. Default is 24 hours.";
        }
      }  // container options
    }  // container dns-resolver
  }  // module fujitsu-dns-resolver