[3034] Added use of D2ClientMgr method to generate FQDNs in b10-dhcp6

Replaced logic in Dhcpv6Srv::generateFqdn() which constructed the
FQDN from the lease address to use D2ClientMgr::generateFqdn() method.
Removed remaining obsolete FQDN_ constants.

src/bin/dhcp6/dhcp6_srv.cc

@@ -98,24 +98,6 @@ Dhcp6Hooks Hooks;
 namespace isc {
 namespace dhcp {
 
-namespace {
-
-// The following constants describe server's behavior with respect to the
-// DHCPv6 Client FQDN Option sent by a client. They will be removed
-// when DDNS parameters for DHCPv6 are implemented with the ticket #3034.
-
-// Do update, even if client requested no updates with N flag (Disabled).
-const bool FQDN_OVERRIDE_NO_UPDATE = false;
-// Server performs an update when client requested delegation (Enabled).
-const bool FQDN_OVERRIDE_CLIENT_UPDATE = true;
-// The fully qualified domain-name suffix if partial name provided by
-// a client.
-const char* FQDN_PARTIAL_SUFFIX = "example.com";
-// Should server replace the domain-name supplied by the client (Disabled).
-const bool FQDN_REPLACE_CLIENT_NAME = false;
-
-}
-
 /// @brief file name of a server-id file
 ///
 /// Server must store its duid in persistent storage that must not change
@@ -2442,17 +2424,8 @@ Dhcpv6Srv::generateFqdn(const Pkt6Ptr& answer) {
     }
     // Get the IPv6 address acquired by the client.
     IOAddress addr = iaaddr->getAddress();
-    std::string hostname = addr.toText();
-    // Colons may not be ok for FQDNs so let's replace them with hyphens.
-    std::replace(hostname.begin(), hostname.end(), ':', '-');
-    std::ostringstream stream;
-    // The final FQDN consists of the partial domain name and the suffix.
-    // For example, if the acquired address is 2001:db8:1::2, the generated
-    // FQDN may be:
-    //     host-2001-db8:1--2.example.com.
-    // where prefix 'host' should be configurable. The domain name suffix
-    // should also be configurable.
-    stream << "host-" << hostname << "." << FQDN_PARTIAL_SUFFIX << ".";
+    std::string generated_name =
+        CfgMgr::instance().getD2ClientMgr().generateFqdn(addr);
     try {
         // The lease has been acquired but the FQDN for this lease hasn't
         // been updated in the lease database. We now have new FQDN
@@ -2463,7 +2436,7 @@ Dhcpv6Srv::generateFqdn(const Pkt6Ptr& answer) {
             Lease6Ptr lease =
                 LeaseMgrFactory::instance().getLease6(Lease::TYPE_NA, addr);
             if (lease) {
-                lease->hostname_ = stream.str();
+                lease->hostname_ = generated_name;
                 LeaseMgrFactory::instance().updateLease6(lease);
 
             } else {
@@ -2474,13 +2447,12 @@ Dhcpv6Srv::generateFqdn(const Pkt6Ptr& answer) {
                           " client");
             }
         }
-
         // Set the generated FQDN in the Client FQDN option.
-        fqdn->setDomainName(stream.str(), Option6ClientFqdn::FULL);
+        fqdn->setDomainName(generated_name, Option6ClientFqdn::FULL);
 
     } catch (const Exception& ex) {
         LOG_ERROR(dhcp6_logger, DHCP6_NAME_GEN_UPDATE_FAIL)
-            .arg(hostname)
+            .arg(addr.toText())
             .arg(ex.what());
     }
 }

src/bin/dhcp6/dhcp6_srv.h

@@ -405,6 +405,7 @@ protected:
     /// objects and store them in the internal queue. Requests created by this
     /// function are only adding or updating DNS records. In order to generate
     /// requests for DNS records removal, use @c createRemovalNameChangeRequest.
+    /// If ddns updates are disabled, this method returns immediately.
     ///
     /// @todo Add support for multiple IAADDR options in the IA_NA.
     ///
@@ -422,6 +423,7 @@ protected:
     /// Note that this function will not remove the entries which server hadn't
     /// added. This is the case, when client performs forward DNS update on its
     /// own.
+    /// If ddns updates are disabled, this method returns immediately.
     ///
     /// @param lease A lease for which the the removal of corresponding DNS
     /// records will be performed.

src/bin/dhcp6/tests/fqdn_unittest.cc

@@ -913,13 +913,13 @@ TEST_F(FqdnDhcpv6SrvTest, processRequestEmptyFqdn) {
     NakedDhcpv6Srv srv(0);
 
     testProcessMessage(DHCPV6_REQUEST, "",
-                       "host-2001-db8-1-1--dead-beef.example.com.",
+                       "myhost-2001-db8-1-1--dead-beef.example.com.",
                        srv, false);
     ASSERT_EQ(1, srv.name_change_reqs_.size());
     verifyNameChangeRequest(srv, isc::dhcp_ddns::CHG_ADD, true, true,
                             "2001:db8:1:1::dead:beef",
-                            "0002018D6874B105A5C92DBBD6E4F6C80A93161"
-                            "BC03996F0CD0EB75800DEF997C29961",
+                            "000201C905E54BE12DE6AF92ADE72752B9F362"
+                            "13B5A8BC9D217548CD739B4CF31AFB1B",
                             0, 4000);
 
 }