[4105] 4o6 configuration structure, unit-tests implemented

src/bin/dhcp4/tests/config_parser_unittest.cc

@@ -3782,4 +3782,143 @@ TEST_F(Dhcp4ParserTest, expiredLeasesProcessingError) {
     EXPECT_TRUE(errorContainsPosition(status, "<string>"));
 }
 
+
+// Checks if the DHCPv4 is able to parse the configuration without 4o6 parameters
+// and do not set 4o6 fields at all.
+TEST_F(Dhcp4ParserTest, 4o6default) {
+
+    ConstElementPtr status;
+
+    // Just a plain v4 config (no 4o6 parameters)
+    string config = "{ " + genIfaceConfig() + "," +
+        "\"rebind-timer\": 2000, "
+        "\"renew-timer\": 1000, "
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\" } ],"
+        "\"valid-lifetime\": 4000 }";
+
+    ElementPtr json = Element::fromJSON(config);
+
+    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+
+    // check if returned status is OK
+    checkResult(status, 0);
+
+    // Now check if the configuration was indeed handled and we have
+    // expected pool configured.
+    Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
+        getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
+    ASSERT_TRUE(subnet);
+
+    Cfg4o6& dhcp4o6 = subnet->get4o6();
+    EXPECT_FALSE(dhcp4o6.enabled_);
+}
+
+// Checks if the DHCPv4 is able to parse the configuration with 4o6 subnet
+// defined.
+TEST_F(Dhcp4ParserTest, 4o6subnet) {
+
+    ConstElementPtr status;
+
+    // Just a plain v4 config (no 4o6 parameters)
+    string config = "{ " + genIfaceConfig() + "," +
+        "\"rebind-timer\": 2000, "
+        "\"renew-timer\": 1000, "
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\","
+        "    \"4o6-subnet\": \"2001:db8::123/45\" } ],"
+        "\"valid-lifetime\": 4000 }";
+
+    ElementPtr json = Element::fromJSON(config);
+
+    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+
+    // check if returned status is OK
+    checkResult(status, 0);
+
+    // Now check if the configuration was indeed handled and we have
+    // expected pool configured.
+    Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
+        getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
+    ASSERT_TRUE(subnet);
+
+    Cfg4o6& dhcp4o6 = subnet->get4o6();
+    EXPECT_TRUE(dhcp4o6.enabled_);
+    EXPECT_EQ(IOAddress("2001:db8::123"), dhcp4o6.subnet4o6_.first);
+    EXPECT_EQ(45, dhcp4o6.subnet4o6_.second);
+}
+
+// Checks if the DHCPv4 is able to parse the configuration with 4o6 network
+// interface defined.
+TEST_F(Dhcp4ParserTest, 4o6iface) {
+
+    ConstElementPtr status;
+
+    // Just a plain v4 config (no 4o6 parameters)
+    string config = "{ " + genIfaceConfig() + "," +
+        "\"rebind-timer\": 2000, "
+        "\"renew-timer\": 1000, "
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\","
+        "    \"4o6-interface\": \"ethX\" } ],"
+        "\"valid-lifetime\": 4000 }";
+
+    ElementPtr json = Element::fromJSON(config);
+
+    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+
+    // check if returned status is OK
+    checkResult(status, 0);
+
+    // Now check if the configuration was indeed handled and we have
+    // expected pool configured.
+    Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
+        getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
+    ASSERT_TRUE(subnet);
+
+    Cfg4o6& dhcp4o6 = subnet->get4o6();
+    EXPECT_TRUE(dhcp4o6.enabled_);
+    EXPECT_EQ("ethX", dhcp4o6.iface4o6_);
+}
+
+// Checks if the DHCPv4 is able to parse the configuration with both 4o6 network
+// interface and v6 subnet defined.
+TEST_F(Dhcp4ParserTest, 4o6subnetIface) {
+
+    ConstElementPtr status;
+
+    // Just a plain v4 config (no 4o6 parameters)
+    string config = "{ " + genIfaceConfig() + "," +
+        "\"rebind-timer\": 2000, "
+        "\"renew-timer\": 1000, "
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\","
+        "    \"4o6-subnet\": \"2001:db8::543/21\","
+        "    \"4o6-interface\": \"ethX\" } ],"
+        "\"valid-lifetime\": 4000 }";
+
+    ElementPtr json = Element::fromJSON(config);
+
+    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+
+    // check if returned status is OK
+    checkResult(status, 0);
+
+    // Now check if the configuration was indeed handled and we have
+    // expected pool configured.
+    Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
+        getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
+    ASSERT_TRUE(subnet);
+
+    Cfg4o6& dhcp4o6 = subnet->get4o6();
+    EXPECT_TRUE(dhcp4o6.enabled_);
+    EXPECT_EQ(IOAddress("2001:db8::543"), dhcp4o6.subnet4o6_.first);
+    EXPECT_EQ(21, dhcp4o6.subnet4o6_.second);
+    EXPECT_EQ("ethX", dhcp4o6.iface4o6_);
+}
+
 }

src/lib/dhcpsrv/subnet.h

@@ -507,6 +507,29 @@ private:
 /// @brief A generic pointer to either Subnet4 or Subnet6 object
 typedef boost::shared_ptr<Subnet> SubnetPtr;
 
+/// @brief This structure contains information about DHCP4o6 (RFC7341)
+///
+/// DHCP4o6 is completely optional. If it is not enabled, this structure
+/// does not contain any information.
+struct Cfg4o6 {
+
+    /// the default constructor.
+    ///
+    /// Initializes fields to their default value.
+    Cfg4o6()
+    :enabled_(false), subnet4o6_(std::make_pair(asiolink::IOAddress("::"), 128u)) {
+    }
+
+    /// Specifies if 4o6 is enabled on this subnet.
+    bool enabled_;
+
+    /// Specifies the network interface used as subnet selector
+    std::string iface4o6_;
+
+    /// Specifies the IPv6 subnet used for subnet selection
+    std::pair<asiolink::IOAddress, uint8_t> subnet4o6_;
+};
+
 /// @brief A configuration holder for IPv4 subnet.
 ///
 /// This class represents an IPv4 subnet.
@@ -559,6 +582,14 @@ public:
         return (match_client_id_);
     }
 
+    /// @brief Returns DHCP4o6 configuration parameters.
+    ///
+    /// This structure is always available. If the 4o6 is not enabled, its
+    /// enabled_ field will be set to false.
+    Cfg4o6& get4o6() {
+        return (dhcp4o6_);
+    }
+
 private:
 
     /// @brief Returns default address for pool selection
@@ -581,6 +612,10 @@ private:
     /// @brief Should server use client identifiers for client lease
     /// lookup.
     bool match_client_id_;
+
+
+    /// @brief All the information related to DHCP4o6
+    Cfg4o6 dhcp4o6_;
 };
 
 /// @brief A pointer to a @c Subnet4 object