[3035] Implemented DHCPv4 Client FQDN option processing.

src/bin/dhcp4/dhcp4_srv.cc

@@ -18,7 +18,6 @@
 #include <dhcp/hwaddr.h>
 #include <dhcp/iface_mgr.h>
 #include <dhcp/option4_addrlst.h>
-#include <dhcp/option4_client_fqdn.h>
 #include <dhcp/option_custom.h>
 #include <dhcp/option_int.h>
 #include <dhcp/option_int_array.h>
@@ -672,7 +671,7 @@ Dhcpv4Srv::processClientName(const Pkt4Ptr& query, Pkt4Ptr& answer) {
     Option4ClientFqdnPtr fqdn = boost::dynamic_pointer_cast<Option4ClientFqdn>
         (query->getOption(DHO_FQDN));
     if (fqdn) {
-        processClientFqdnOption(query, answer);
+        processClientFqdnOption(fqdn, answer);
 
     } else {
         OptionCustomPtr hostname = boost::dynamic_pointer_cast<OptionCustom>
@@ -685,7 +684,18 @@ Dhcpv4Srv::processClientName(const Pkt4Ptr& query, Pkt4Ptr& answer) {
 }
 
 void
-Dhcpv4Srv::processClientFqdnOption(const Pkt4Ptr&, Pkt4Ptr&) {
+Dhcpv4Srv::processClientFqdnOption(const Option4ClientFqdnPtr& fqdn,
+                                   Pkt4Ptr& answer) {
+    // Create the DHCPv4 Client FQDN Option to be included in the server's
+    // response to a client.
+    Option4ClientFqdnPtr fqdn_resp(new Option4ClientFqdn(*fqdn));
+
+    // RFC4702, section 4 - set 'NOS' flags to 0.
+    fqdn_resp->setFlag(Option4ClientFqdn::FLAG_S, 0);
+    fqdn_resp->setFlag(Option4ClientFqdn::FLAG_O, 0);
+    fqdn_resp->setFlag(Option4ClientFqdn::FLAG_N, 0);
+
+    answer->addOption(fqdn_resp);
 }
 
 void

src/bin/dhcp4/dhcp4_srv.h

@@ -18,6 +18,7 @@
 #include <dhcp/dhcp4.h>
 #include <dhcp/pkt4.h>
 #include <dhcp/option.h>
+#include <dhcp/option4_client_fqdn.h>
 #include <dhcpsrv/subnet.h>
 #include <dhcpsrv/alloc_engine.h>
 #include <hooks/callout_handle.h>
@@ -289,9 +290,10 @@ protected:
 private:
     /// @brief Process Client FQDN %Option sent by a client.
     ///
-    /// @param query A DISCOVER or REQUEST message from a cient.
+    /// @param fqdn An DHCPv4 Client FQDN %Option sent by a client.
     /// @param [out] answer A response message to be sent to a client.
-    void processClientFqdnOption(const Pkt4Ptr& query, Pkt4Ptr& answer);
+    void processClientFqdnOption(const Option4ClientFqdnPtr& fqdn,
+                                 Pkt4Ptr& answer);
 
     /// @brief Process Hostname %Option sent by a client.
     ///

src/bin/dhcp4/tests/fqdn_unittest.cc

@@ -126,7 +126,9 @@ private:
 
 };
 
-TEST_F(FqdnDhcpv4SrvTest, basic) {
+// Test that server confirms to perform the forward and reverse DNS update,
+// when client asks for it.
+TEST_F(FqdnDhcpv4SrvTest, serverUpdateForward) {
     Pkt4Ptr query = generatePktWithFqdn(DHCPREQUEST,
                                         Option4ClientFqdn::FLAG_E |
                                         Option4ClientFqdn::FLAG_S,
@@ -140,4 +142,53 @@ TEST_F(FqdnDhcpv4SrvTest, basic) {
 
 }
 
+// Test that server generates the fully qualified domain name for the client
+// if client supplies the partial name.
+TEST_F(FqdnDhcpv4SrvTest, serverUpdateForwardPartialName) {
+    Pkt4Ptr query = generatePktWithFqdn(DHCPREQUEST,
+                                        Option4ClientFqdn::FLAG_E |
+                                        Option4ClientFqdn::FLAG_S,
+                                        "myhost",
+                                        Option4ClientFqdn::PARTIAL,
+                                        true);
+
+    testProcessFqdn(query,
+                    Option4ClientFqdn::FLAG_E | Option4ClientFqdn::FLAG_S,
+                    "myhost.example.com.");
+
+}
+
+// Test that server generates the fully qualified domain name for the client
+// if clietn supplies empty domain name.
+TEST_F(FqdnDhcpv4SrvTest, serverUpdateForwardNoName) {
+    Pkt4Ptr query = generatePktWithFqdn(DHCPREQUEST,
+                                        Option4ClientFqdn::FLAG_E |
+                                        Option4ClientFqdn::FLAG_S,
+                                        "",
+                                        Option4ClientFqdn::PARTIAL,
+                                        true);
+
+    testProcessFqdn(query,
+                    Option4ClientFqdn::FLAG_E | Option4ClientFqdn::FLAG_S,
+                    "myhost.example.com.");
+
+}
+
+// Test that server does not accept delegation of the forward DNS update
+// to a client.
+TEST_F(FqdnDhcpv4SrvTest, clientUpdateNotAllowed) {
+    Pkt4Ptr query = generatePktWithFqdn(DHCPREQUEST,
+                                        Option4ClientFqdn::FLAG_E,
+                                        "myhost.example.com.",
+                                        Option4ClientFqdn::PARTIAL,
+                                        true);
+
+    testProcessFqdn(query, Option4ClientFqdn::FLAG_E |
+                    Option4ClientFqdn::FLAG_S | Option4ClientFqdn::FLAG_O,
+                    "myhost.example.com.");
+
+}
+
+
+
 } // end of anonymous namespace