config_parser_unittest.cc 101 KB
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// Copyright (C) 2012-2014 Internet Systems Consortium, Inc. ("ISC")
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//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#include <config.h>

#include <arpa/inet.h>
#include <gtest/gtest.h>

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#include <config/ccsession.h>
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#include <dhcp4/dhcp4_srv.h>
#include <dhcp4/config_parser.h>
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#include <dhcp/option4_addrlst.h>
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#include <dhcp/option_custom.h>
#include <dhcp/option_int.h>
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#include <dhcp/docsis3_option_defs.h>
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#include <dhcpsrv/subnet.h>
#include <dhcpsrv/cfgmgr.h>
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#include <hooks/hooks_manager.h>

#include "marker_file.h"
#include "test_libraries.h"
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#include "test_data_files_config.h"
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#include <boost/foreach.hpp>
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#include <boost/scoped_ptr.hpp>

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#include <iostream>
#include <fstream>
#include <sstream>
#include <limits.h>
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using namespace isc;
using namespace isc::asiolink;
using namespace isc::config;
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using namespace isc::data;
using namespace isc::dhcp;
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using namespace isc::dhcp::test;
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using namespace isc::hooks;
using namespace std;
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namespace {

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/// @brief Prepends the given name with the DHCP4 source directory
///
/// @param name file name of the desired file
/// @return string containing the absolute path of the file in the DHCP source
/// directory.
std::string specfile(const std::string& name) {
    return (std::string(DHCP4_SRC_DIR) + "/" + name);
}

/// @brief Tests that the spec file is valid.
/// Verifies that the BIND10 DHCP-DDNS configuration specification file
//  is valid.
TEST(Dhcp4SpecTest, basicSpec) {
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    (isc::config::moduleSpecFromFile(specfile("dhcp4.spec")));
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    ASSERT_NO_THROW(isc::config::moduleSpecFromFile(specfile("dhcp4.spec")));
}

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class Dhcp4ParserTest : public ::testing::Test {
public:
    Dhcp4ParserTest()
    :rcode_(-1) {
        // Open port 0 means to not do anything at all. We don't want to
        // deal with sockets here, just check if configuration handling
        // is sane.
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        srv_.reset(new Dhcpv4Srv(0));
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        CfgMgr::instance().deleteActiveIfaces();
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    }

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    // Check that no hooks libraries are loaded.  This is a pre-condition for
    // a number of tests, so is checked in one place.  As this uses an
    // ASSERT call - and it is not clear from the documentation that Gtest
    // predicates can be used in a constructor - the check is placed in SetUp.
    void SetUp() {
        std::vector<std::string> libraries = HooksManager::getLibraryNames();
        ASSERT_TRUE(libraries.empty());
    }

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    // Checks if global parameter of name have expected_value
    void checkGlobalUint32(string name, uint32_t expected_value) {
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        const Uint32StoragePtr uint32_defaults =
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                                        globalContext()->uint32_values_;
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        try {
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            uint32_t actual_value = uint32_defaults->getParam(name);
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            EXPECT_EQ(expected_value, actual_value);
        } catch (DhcpConfigError) {
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            ADD_FAILURE() << "Expected uint32 with name " << name
                          << " not found";
        }
    }

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    // Checks if the result of DHCP server configuration has
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    // expected code (0 for success, other for failures).
    // Also stores result in rcode_ and comment_.
    void checkResult(ConstElementPtr status, int expected_code) {
        ASSERT_TRUE(status);
        comment_ = parseAnswer(rcode_, status);
        EXPECT_EQ(expected_code, rcode_);
    }

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    ~Dhcp4ParserTest() {
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        resetConfiguration();
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        // ... and delete the hooks library marker files if present
        unlink(LOAD_MARKER_FILE);
        unlink(UNLOAD_MARKER_FILE);
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    };

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    /// @brief Create the simple configuration with single option.
    ///
    /// This function allows to set one of the parameters that configure
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    /// option value. These parameters are: "name", "code", "data",
    /// "csv-format" and "space".
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    ///
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    /// @param param_value string holding option parameter value to be
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    /// injected into the configuration string.
    /// @param parameter name of the parameter to be configured with
    /// param value.
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    /// @return configuration string containing custom values of parameters
    /// describing an option.
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    std::string createConfigWithOption(const std::string& param_value,
                                       const std::string& parameter) {
        std::map<std::string, std::string> params;
        if (parameter == "name") {
            params["name"] = param_value;
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            params["space"] = "dhcp4";
            params["code"] = "56";
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            params["data"] = "ABCDEF0105";
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            params["csv-format"] = "False";
        } else if (parameter == "space") {
            params["name"] = "dhcp-message";
            params["space"] = param_value;
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            params["code"] = "56";
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            params["data"] = "ABCDEF0105";
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            params["csv-format"] = "False";
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        } else if (parameter == "code") {
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            params["name"] = "dhcp-message";
            params["space"] = "dhcp4";
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            params["code"] = param_value;
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            params["data"] = "ABCDEF0105";
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            params["csv-format"] = "False";
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        } else if (parameter == "data") {
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            params["name"] = "dhcp-message";
            params["space"] = "dhcp4";
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            params["code"] = "56";
            params["data"] = param_value;
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            params["csv-format"] = "False";
        } else if (parameter == "csv-format") {
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            params["name"] = "dhcp-message";
            params["space"] = "dhcp4";
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            params["code"] = "56";
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            params["data"] = "ABCDEF0105";
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            params["csv-format"] = param_value;
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        }
        return (createConfigWithOption(params));
    }

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    /// @brief Create simple configuration with single option.
    ///
    /// This function creates a configuration for a single option with
    /// custom values for all parameters that describe the option.
    ///
    /// @params params map holding parameters and their values.
    /// @return configuration string containing custom values of parameters
    /// describing an option.
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    std::string createConfigWithOption(const std::map<std::string, std::string>& params) {
        std::ostringstream stream;
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        stream << "{ \"interfaces\": [ \"*\" ],"
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            "\"rebind-timer\": 2000, "
            "\"renew-timer\": 1000, "
            "\"subnet4\": [ { "
            "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
            "    \"subnet\": \"192.0.2.0/24\", "
            "    \"option-data\": [ {";
        bool first = true;
        typedef std::pair<std::string, std::string> ParamPair;
        BOOST_FOREACH(ParamPair param, params) {
            if (!first) {
                stream << ", ";
            } else {
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                // cppcheck-suppress unreadVariable
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                first = false;
            }
            if (param.first == "name") {
                stream << "\"name\": \"" << param.second << "\"";
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            } else if (param.first == "space") {
                stream << "\"space\": \"" << param.second << "\"";
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            } else if (param.first == "code") {
                stream << "\"code\": " << param.second << "";
            } else if (param.first == "data") {
                stream << "\"data\": \"" << param.second << "\"";
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            } else if (param.first == "csv-format") {
                stream << "\"csv-format\": " << param.second;
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            }
        }
        stream <<
            "        } ]"
            " } ],"
            "\"valid-lifetime\": 4000 }";
        return (stream.str());
    }

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    Subnet::OptionDescriptor
    getOptionFromSubnet(const IOAddress& subnet_address,
                        const uint16_t option_code,
                        const uint16_t expected_options_count = 1) {
        Subnet4Ptr subnet = CfgMgr::instance().getSubnet4(subnet_address);
        if (!subnet) {
            /// @todo replace toText() with the use of operator <<.
            ADD_FAILURE() << "A subnet for the specified address "
                          << subnet_address.toText()
                          << "does not exist in Config Manager";
        }
        Subnet::OptionContainerPtr options =
            subnet->getOptionDescriptors("dhcp4");
        if (expected_options_count != options->size()) {
            ADD_FAILURE() << "The number of options in the subnet '"
                          << subnet_address.toText() << "' is different "
                " than expected number of options '"
                          << expected_options_count << "'";
        }

        // Get the search index. Index #1 is to search using option code.
        const Subnet::OptionContainerTypeIndex& idx = options->get<1>();

        // Get the options for specified index. Expecting one option to be
        // returned but in theory we may have multiple options with the same
        // code so we get the range.
        std::pair<Subnet::OptionContainerTypeIndex::const_iterator,
                  Subnet::OptionContainerTypeIndex::const_iterator> range =
            idx.equal_range(option_code);
        if (std::distance(range.first, range.second) > 1) {
            ADD_FAILURE() << "There is more than one option having the"
                " option code '" << option_code << "' in a subnet '"
                          << subnet_address.toText() << "'. Expected "
                " at most one option";
        } else if (std::distance(range.first, range.second) == 0) {
            return (Subnet::OptionDescriptor(OptionPtr(), false));
        }

        return (*range.first);
    }

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    /// @brief Test invalid option parameter value.
    ///
    /// This test function constructs the simple configuration
    /// string and injects invalid option configuration into it.
    /// It expects that parser will fail with provided option code.
    ///
    /// @param param_value string holding invalid option parameter value
    /// to be injected into configuration string.
    /// @param parameter name of the parameter to be configured with
    /// param_value (can be any of "name", "code", "data")
    void testInvalidOptionParam(const std::string& param_value,
                                const std::string& parameter) {
        ConstElementPtr x;
        std::string config = createConfigWithOption(param_value, parameter);
        ElementPtr json = Element::fromJSON(config);
        EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
        ASSERT_TRUE(x);
        comment_ = parseAnswer(rcode_, x);
        ASSERT_EQ(1, rcode_);
    }

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    /// @brief Test invalid option paramater value.
    ///
    /// This test function constructs the simple configuration
    /// string and injects invalid option configuration into it.
    /// It expects that parser will fail with provided option code.
    ///
    /// @param params Map of parameters defining an option.
    void
    testInvalidOptionParam(const std::map<std::string, std::string>& params) {
        ConstElementPtr x;
        std::string config = createConfigWithOption(params);
        ElementPtr json = Element::fromJSON(config);
        EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
        ASSERT_TRUE(x);
        comment_ = parseAnswer(rcode_, x);
        ASSERT_EQ(1, rcode_);
    }

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    /// @brief Test option against given code and data.
    ///
    /// @param option_desc option descriptor that carries the option to
    /// be tested.
    /// @param expected_code expected code of the option.
    /// @param expected_data expected data in the option.
    /// @param expected_data_len length of the reference data.
    /// @param extra_data if true extra data is allowed in an option
    /// after tested data.
    void testOption(const Subnet::OptionDescriptor& option_desc,
                    uint16_t expected_code, const uint8_t* expected_data,
                    size_t expected_data_len,
                    bool extra_data = false) {
        // Check if option descriptor contains valid option pointer.
        ASSERT_TRUE(option_desc.option);
        // Verify option type.
        EXPECT_EQ(expected_code, option_desc.option->getType());
        // We may have many different option types being created. Some of them
        // have dedicated classes derived from Option class. In such case if
        // we want to verify the option contents against expected_data we have
        // to prepare raw buffer with the contents of the option. The easiest
        // way is to call pack() which will prepare on-wire data.
        util::OutputBuffer buf(option_desc.option->getData().size());
        option_desc.option->pack(buf);
        if (extra_data) {
            // The length of the buffer must be at least equal to size of the
            // reference data but it can sometimes be greater than that. This is
            // because some options carry suboptions that increase the overall
            // length.
            ASSERT_GE(buf.getLength() - option_desc.option->getHeaderLen(),
                      expected_data_len);
        } else {
            ASSERT_EQ(buf.getLength() - option_desc.option->getHeaderLen(),
                      expected_data_len);
        }
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        // Verify that the data is correct. Do not verify suboptions and a header.
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        const uint8_t* data = static_cast<const uint8_t*>(buf.getData());
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        EXPECT_EQ(0, memcmp(expected_data, data + option_desc.option->getHeaderLen(),
                            expected_data_len));
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    }

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    /// @brief Test option configuration.
    ///
    /// This function creates a configuration for a specified option using
    /// a map of parameters specified as the argument. The map holds
    /// name/value pairs which identifies option's configuration parameters:
    /// - name
    /// - space
    /// - code
    /// - data
    /// - csv-format.
    /// This function applies a new server configuration and checks that the
    /// option being configured is inserted into CfgMgr. The raw contents of
    /// this option are compared with the binary data specified as expected
    /// data passed to this function.
    ///
    /// @param params Map of parameters defining an option.
    /// @param option_code Option code.
    /// @param expected_data Array containing binary data expected to be stored
    /// in the configured option.
    /// @param expected_data_len Length of the array holding reference data.
    void testConfiguration(const std::map<std::string, std::string>& params,
                           const uint16_t option_code,
                           const uint8_t* expected_data,
                           const size_t expected_data_len) {
        std::string config = createConfigWithOption(params);
        ASSERT_TRUE(executeConfiguration(config, "parse option configuration"));
        // The subnet should now hold one option with the code 19.
        Subnet::OptionDescriptor desc =
            getOptionFromSubnet(IOAddress("192.0.2.24"), 19);
        ASSERT_TRUE(desc.option);
        testOption(desc, option_code, expected_data, expected_data_len);
    }

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    /// @brief Parse and Execute configuration
    ///
    /// Parses a configuration and executes a configuration of the server.
    /// If the operation fails, the current test will register a failure.
    ///
    /// @param config Configuration to parse
    /// @param operation Operation being performed.  In the case of an error,
    ///        the error text will include the string "unable to <operation>.".
    ///
    /// @return true if the configuration succeeded, false if not.  In the
    ///         latter case, a failure will have been added to the current test.
    bool
    executeConfiguration(const std::string& config, const char* operation) {
        ConstElementPtr status;
        try {
            ElementPtr json = Element::fromJSON(config);
            status = configureDhcp4Server(*srv_, json);
        } catch (const std::exception& ex) {
            ADD_FAILURE() << "Unable to " << operation << ". "
                   << "The following configuration was used: " << std::endl
                   << config << std::endl
                   << " and the following error message was returned:"
                   << ex.what() << std::endl;
            return (false);
        }

        // The status object must not be NULL
        if (!status) {
            ADD_FAILURE() << "Unable to " << operation << ". "
                   << "The configuration function returned a null pointer.";
            return (false);
        }

        // Store the answer if we need it.

        // Returned value should be 0 (configuration success)
        comment_ = parseAnswer(rcode_, status);
        if (rcode_ != 0) {
            string reason = "";
            if (comment_) {
                reason = string(" (") + comment_->stringValue() + string(")");
            }
            ADD_FAILURE() << "Unable to " << operation << ". "
                   << "The configuration function returned error code "
                   << rcode_ << reason;
            return (false);
        }

        return (true);
    }

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    /// @brief Reset configuration database.
    ///
    /// This function resets configuration data base by
    /// removing all subnets and option-data. Reset must
    /// be performed after each test to make sure that
    /// contents of the database do not affect result of
    /// subsequent tests.
    void resetConfiguration() {
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        string config = "{ \"interfaces\": [ \"*\" ],"
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            "\"hooks-libraries\": [ ], "
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            "\"rebind-timer\": 2000, "
            "\"renew-timer\": 1000, "
            "\"valid-lifetime\": 4000, "
            "\"subnet4\": [ ], "
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            "\"dhcp-ddns\": { \"enable-updates\" : false }, "
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            "\"option-def\": [ ], "
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            "\"option-data\": [ ] }";
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        static_cast<void>(executeConfiguration(config,
                                               "reset configuration database"));
    }
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    boost::scoped_ptr<Dhcpv4Srv> srv_;      // DHCP4 server under test
    int rcode_;                             // Return code from element parsing
    ConstElementPtr comment_;               // Reason for parse fail
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};

// Goal of this test is a verification if a very simple config update
// with just a bumped version number. That's the simplest possible
// config update.
TEST_F(Dhcp4ParserTest, version) {

    ConstElementPtr x;

    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_,
                    Element::fromJSON("{\"version\": 0}")));

    // returned value must be 0 (configuration accepted)
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    checkResult(x, 0);
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}

/// The goal of this test is to verify that the code accepts only
/// valid commands and malformed or unsupported parameters are rejected.
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TEST_F(Dhcp4ParserTest, bogusCommand) {
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    ConstElementPtr x;

    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_,
                    Element::fromJSON("{\"bogus\": 5}")));

    // returned value must be 1 (configuration parse error)
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    checkResult(x, 1);
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}

/// The goal of this test is to verify if wrongly defined subnet will
/// be rejected. Properly defined subnet must include at least one
/// pool definition.
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TEST_F(Dhcp4ParserTest, emptySubnet) {
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    ConstElementPtr status;

    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_,
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                    Element::fromJSON("{ \"interfaces\": [ \"*\" ],"
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                                      "\"rebind-timer\": 2000, "
                                      "\"renew-timer\": 1000, "
                                      "\"subnet4\": [  ], "
                                      "\"valid-lifetime\": 4000 }")));

    // returned value should be 0 (success)
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    checkResult(status, 0);

    checkGlobalUint32("rebind-timer", 2000);
    checkGlobalUint32("renew-timer", 1000);
    checkGlobalUint32("valid-lifetime", 4000);
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}

/// The goal of this test is to verify if defined subnet uses global
/// parameter timer definitions.
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TEST_F(Dhcp4ParserTest, subnetGlobalDefaults) {
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    ConstElementPtr status;

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    string config = "{ \"interfaces\": [ \"*\" ],"
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        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"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
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    checkResult(status, 0);
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    // Now check if the configuration was indeed handled and we have
    // expected pool configured.
    Subnet4Ptr subnet = CfgMgr::instance().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ(1000, subnet->getT1());
    EXPECT_EQ(2000, subnet->getT2());
    EXPECT_EQ(4000, subnet->getValid());
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    // Check that subnet-id is 1
    EXPECT_EQ(1, subnet->getID());
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}

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// Goal of this test is to verify that multiple subnets get unique
// subnet-ids. Also, test checks that it's possible to do reconfiguration
// multiple times.
TEST_F(Dhcp4ParserTest, multipleSubnets) {
    ConstElementPtr x;
    string config = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.3.101 - 192.0.3.150\" ],"
        "    \"subnet\": \"192.0.3.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.4.101 - 192.0.4.150\" ],"
        "    \"subnet\": \"192.0.4.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.5.101 - 192.0.5.150\" ],"
        "    \"subnet\": \"192.0.5.0/24\" "
        " } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json = Element::fromJSON(config);

    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
    ASSERT_TRUE(x);
    comment_ = parseAnswer(rcode_, x);
    ASSERT_EQ(0, rcode_);

    int cnt = 0; // Number of reconfigurations

    do {
        ElementPtr json = Element::fromJSON(config);

        EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
        ASSERT_TRUE(x);
        comment_ = parseAnswer(rcode_, x);
        ASSERT_EQ(0, rcode_);

        const Subnet4Collection* subnets = CfgMgr::instance().getSubnets4();
        ASSERT_TRUE(subnets);
        ASSERT_EQ(4, subnets->size()); // We expect 4 subnets

        // Check subnet-ids of each subnet (it should be monotonously increasing)
        EXPECT_EQ(1, subnets->at(0)->getID());
        EXPECT_EQ(2, subnets->at(1)->getID());
        EXPECT_EQ(3, subnets->at(2)->getID());
        EXPECT_EQ(4, subnets->at(3)->getID());

        // Repeat reconfiguration process 10 times and check that the subnet-id
        // is set to the same value. Technically, just two iterations would be
        // sufficient, but it's nice to have a test that exercises reconfiguration
        // a bit.
    } while (++cnt < 10);
}

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// Goal of this test is to verify that a previously configured subnet can be
// deleted in subsequent reconfiguration.
TEST_F(Dhcp4ParserTest, reconfigureRemoveSubnet) {
    ConstElementPtr x;

    // All four subnets
    string config4 = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.3.101 - 192.0.3.150\" ],"
        "    \"subnet\": \"192.0.3.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.4.101 - 192.0.4.150\" ],"
        "    \"subnet\": \"192.0.4.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.5.101 - 192.0.5.150\" ],"
        "    \"subnet\": \"192.0.5.0/24\" "
        " } ],"
        "\"valid-lifetime\": 4000 }";

    // Three subnets (the last one removed)
    string config_first3 = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.3.101 - 192.0.3.150\" ],"
        "    \"subnet\": \"192.0.3.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.4.101 - 192.0.4.150\" ],"
        "    \"subnet\": \"192.0.4.0/24\" "
        " } ],"
        "\"valid-lifetime\": 4000 }";

    // Second subnet removed
    string config_second_removed = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.4.101 - 192.0.4.150\" ],"
        "    \"subnet\": \"192.0.4.0/24\" "
        " },"
        " {"
        "    \"pool\": [ \"192.0.5.101 - 192.0.5.150\" ],"
        "    \"subnet\": \"192.0.5.0/24\" "
        " } ],"
        "\"valid-lifetime\": 4000 }";

    // CASE 1: Configure 4 subnets, then reconfigure and remove the
    // last one.

    ElementPtr json = Element::fromJSON(config4);
    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
    ASSERT_TRUE(x);
    comment_ = parseAnswer(rcode_, x);
    ASSERT_EQ(0, rcode_);

    const Subnet4Collection* subnets = CfgMgr::instance().getSubnets4();
    ASSERT_TRUE(subnets);
    ASSERT_EQ(4, subnets->size()); // We expect 4 subnets

    // Do the reconfiguration (the last subnet is removed)
    json = Element::fromJSON(config_first3);
    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
    ASSERT_TRUE(x);
    comment_ = parseAnswer(rcode_, x);
    ASSERT_EQ(0, rcode_);

    subnets = CfgMgr::instance().getSubnets4();
    ASSERT_TRUE(subnets);
    ASSERT_EQ(3, subnets->size()); // We expect 3 subnets now (4th is removed)

    // Check subnet-ids of each subnet (it should be monotonously increasing)
    EXPECT_EQ(1, subnets->at(0)->getID());
    EXPECT_EQ(2, subnets->at(1)->getID());
    EXPECT_EQ(3, subnets->at(2)->getID());

    /// CASE 2: Configure 4 subnets, then reconfigure and remove one
    /// from in between (not first, not last)

#if 0
    /// @todo: Uncomment subnet removal test as part of #3281.
    json = Element::fromJSON(config4);
    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
    ASSERT_TRUE(x);
    comment_ = parseAnswer(rcode_, x);
    ASSERT_EQ(0, rcode_);

    // Do reconfiguration
    json = Element::fromJSON(config_second_removed);
    EXPECT_NO_THROW(x = configureDhcp4Server(*srv_, json));
    ASSERT_TRUE(x);
    comment_ = parseAnswer(rcode_, x);
    ASSERT_EQ(0, rcode_);

    subnets = CfgMgr::instance().getSubnets4();
    ASSERT_TRUE(subnets);
    ASSERT_EQ(3, subnets->size()); // We expect 4 subnets

    EXPECT_EQ(1, subnets->at(0)->getID());
    // The second subnet (with subnet-id = 2) is no longer there
    EXPECT_EQ(3, subnets->at(1)->getID());
    EXPECT_EQ(4, subnets->at(2)->getID());
#endif

}

/// @todo: implement subnet removal test as part of #3281.
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// Checks if the next-server defined as global parameter is taken into
// consideration.
TEST_F(Dhcp4ParserTest, nextServerGlobal) {

    ConstElementPtr status;

    string config = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"next-server\": \"1.2.3.4\", "
        "\"subnet4\": [ { "
        "    \"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().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ("1.2.3.4", subnet->getSiaddr().toText());
}

// Checks if the next-server defined as subnet parameter is taken into
// consideration.
TEST_F(Dhcp4ParserTest, nextServerSubnet) {

    ConstElementPtr status;

    string config = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"next-server\": \"1.2.3.4\", "
        "    \"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().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ("1.2.3.4", subnet->getSiaddr().toText());
}

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// Test checks several negative scenarios for next-server configuration: bogus
// address, IPv6 adddress and empty string.
TEST_F(Dhcp4ParserTest, nextServerNegative) {

    ConstElementPtr status;

    // Config with junk instead of next-server address
    string config_bogus1 = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
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        "    \"rebind-timer\": 2000, "
        "    \"renew-timer\": 1000, "
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        "    \"next-server\": \"a.b.c.d\", "
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    // Config with IPv6 next server address
    string config_bogus2 = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
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        "    \"rebind-timer\": 2000, "
        "    \"renew-timer\": 1000, "
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        "    \"next-server\": \"2001:db8::1\", "
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    // Config with empty next server address
    string config_bogus3 = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
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        "    \"rebind-timer\": 2000, "
        "    \"renew-timer\": 1000, "
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        "    \"next-server\": \"\", "
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json1 = Element::fromJSON(config_bogus1);
    ElementPtr json2 = Element::fromJSON(config_bogus2);
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    ElementPtr json3 = Element::fromJSON(config_bogus3);
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    // check if returned status is always a failure
    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json1));
    checkResult(status, 1);

    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json2));
    checkResult(status, 1);

    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json3));
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    checkResult(status, 0);
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}

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// Checks if the next-server defined as global value is overridden by subnet
// specific value.
TEST_F(Dhcp4ParserTest, nextServerOverride) {

    ConstElementPtr status;

    string config = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"next-server\": \"192.0.0.1\", "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"next-server\": \"1.2.3.4\", "
        "    \"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().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ("1.2.3.4", subnet->getSiaddr().toText());
}

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// Check whether it is possible to configure echo-client-id
TEST_F(Dhcp4ParserTest, echoClientId) {

    ConstElementPtr status;

    string config_false = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"echo-client-id\": false,"
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    string config_true = "{ \"interfaces\": [ \"*\" ],"
        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"echo-client-id\": true,"
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json_false = Element::fromJSON(config_false);
    ElementPtr json_true = Element::fromJSON(config_true);

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    // Let's check the default. It should be true
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    ASSERT_TRUE(CfgMgr::instance().echoClientId());
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    // Now check that "false" configuration is really applied.
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    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json_false));
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    ASSERT_FALSE(CfgMgr::instance().echoClientId());
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    // Now check that "true" configuration is really applied.
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    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json_true));
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    ASSERT_TRUE(CfgMgr::instance().echoClientId());
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    // In any case revert back to the default value (true)
    CfgMgr::instance().echoClientId(true);
}

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// This test checks if it is possible to override global values
// on a per subnet basis.
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TEST_F(Dhcp4ParserTest, subnetLocal) {
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    ConstElementPtr status;

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    string config = "{ \"interfaces\": [ \"*\" ],"
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        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.1 - 192.0.2.100\" ],"
        "    \"renew-timer\": 1, "
        "    \"rebind-timer\": 2, "
        "    \"valid-lifetime\": 4,"
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json = Element::fromJSON(config);

    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));

    // returned value should be 0 (configuration success)
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    checkResult(status, 0);
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    Subnet4Ptr subnet = CfgMgr::instance().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ(1, subnet->getT1());
    EXPECT_EQ(2, subnet->getT2());
    EXPECT_EQ(4, subnet->getValid());
}

// Test verifies that a subnet with pool values that do not belong to that
// pool are rejected.
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TEST_F(Dhcp4ParserTest, poolOutOfSubnet) {
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    ConstElementPtr status;

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        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.4.0/28\" ],"
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json = Element::fromJSON(config);

    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));

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    // as the pool does not belong to that subnet
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    checkResult(status, 1);
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}

// Goal of this test is to verify if pools can be defined
// using prefix/length notation. There is no separate test for min-max
// notation as it was tested in several previous tests.
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TEST_F(Dhcp4ParserTest, poolPrefixLen) {
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    ConstElementPtr status;
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    string config = "{ \"interfaces\": [ \"*\" ],"
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        "\"rebind-timer\": 2000, "
        "\"renew-timer\": 1000, "
        "\"subnet4\": [ { "
        "    \"pool\": [ \"192.0.2.128/28\" ],"
        "    \"subnet\": \"192.0.2.0/24\" } ],"
        "\"valid-lifetime\": 4000 }";

    ElementPtr json = Element::fromJSON(config);

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    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
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    // returned value must be 0 (configuration accepted)
    checkResult(status, 0);
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    Subnet4Ptr subnet = CfgMgr::instance().getSubnet4(IOAddress("192.0.2.200"));
    ASSERT_TRUE(subnet);
    EXPECT_EQ(1000, subnet->getT1());
    EXPECT_EQ(2000, subnet->getT2());
    EXPECT_EQ(4000, subnet->getValid());
}

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// that defines an option carrying an IPv4 address can be created.
TEST_F(Dhcp4ParserTest, optionDefIpv4Address) {
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    // Configuration string.
    std::string config =
        "{ \"option-def\": [ {"
        "      \"name\": \"foo\","
        "      \"code\": 100,"
        "      \"type\": \"ipv4-address\","
        "      \"array\": False,"
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        "      \"space\": \"isc\","
        "      \"encapsulate\": \"\""
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        "  } ]"
        "}";
    ElementPtr json = Element::fromJSON(config);

    // Make sure that the particular option definition does not exist.