dhcp6_srv_unittest.cc

// Copyright (C) 2011-2017 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <config.h>

#include <asiolink/io_address.h>
#include <dhcp/dhcp6.h>
#include <dhcp/duid.h>
#include <dhcp/option.h>
#include <dhcp/option6_addrlst.h>
#include <dhcp/option6_ia.h>
#include <dhcp/option6_iaaddr.h>
#include <dhcp/option_int.h>
#include <dhcp/option_int_array.h>
#include <dhcp/option_string.h>
#include <dhcp/option_vendor.h>
#include <dhcp/option_vendor_class.h>
#include <dhcp/iface_mgr.h>
#include <dhcp6/json_config_parser.h>
#include <dhcp/dhcp6.h>
#include <dhcp/docsis3_option_defs.h>
#include <dhcp/tests/iface_mgr_test_config.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcpsrv/lease_mgr.h>
#include <dhcpsrv/lease_mgr_factory.h>
#include <dhcpsrv/host_mgr.h>
#include <dhcpsrv/utils.h>
#include <util/buffer.h>
#include <util/range_utilities.h>
#include <util/encode/hex.h>
#include <stats/stats_mgr.h>

#include <dhcp6/tests/dhcp6_test_utils.h>
#include <dhcp6/tests/dhcp6_client.h>
#include <dhcp/tests/pkt_captures.h>
#include <cc/command_interpreter.h>
#include <boost/pointer_cast.hpp>
#include <boost/scoped_ptr.hpp>
#include <gtest/gtest.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <sstream>

using namespace isc;
using namespace isc::data;
using namespace isc::asiolink;
using namespace isc::dhcp;
using namespace isc::dhcp::test;
using namespace isc::util;
using namespace std;

namespace {

const char* CONFIGS[] = {
    // Configuration 0:
    // - used in advertiseOptions
    "{ \"interfaces-config\": {"
    "  \"interfaces\": [ \"*\" ]"
    "},"
    "\"preferred-lifetime\": 3000,"
    "\"rebind-timer\": 2000, "
    "\"renew-timer\": 1000, "
    "\"subnet6\": [ { "
    "    \"pools\": [ { \"pool\": \"2001:db8:1::/64\" } ],"
    "    \"subnet\": \"2001:db8:1::/48\", "
    "    \"interface\": \"eth0\", "
    "    \"option-data\": [ {"
    "          \"name\": \"dns-servers\","
    "          \"data\": \"2001:db8:1234:FFFF::1, 2001:db8:1234:FFFF::2\""
    "        },"
    "        {"
    "          \"name\": \"subscriber-id\","
    "          \"data\": \"1234\","
    "          \"csv-format\": false"
    "        } ]"
    " } ],"
    "\"valid-lifetime\": 4000 }",

    // Configuration 1:
    // - a single subnet
    // - MySQL host data source
    "{ \"interfaces-config\": {"
    "  \"interfaces\": [ \"*\" ]"
    "},"
    "\"hosts-database\": {"
    "    \"type\": \"mysql\","
    "    \"name\": \"keatest\","
    "    \"user\": \"keatest\","
    "    \"password\": \"keatest\""
    "},"
    "\"preferred-lifetime\": 3000,"
    "\"rebind-timer\": 2000, "
    "\"renew-timer\": 1000, "
    "\"subnet6\": [ { "
    "    \"pools\": [ { \"pool\": \"2001:db8:1::/64\" } ],"
    "    \"subnet\": \"2001:db8:1::/48\" "
    " } ],"
    "\"valid-lifetime\": 4000 }"
};

// This test verifies that incoming SOLICIT can be handled properly when
// there are no subnets configured.
//
// This test sends a SOLICIT and the expected response
// is an ADVERTISE with STATUS_NoAddrsAvail and no address provided in the
// response
TEST_F(NakedDhcpv6SrvTest, SolicitNoSubnet) {
    NakedDhcpv6Srv srv(0);

    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->addOption(generateIA(D6O_IA_NA, 234, 1500, 3000));
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply = srv.processSolicit(sol);

    // check that we get the right NAK
    checkNakResponse(reply, DHCPV6_ADVERTISE, 1234, STATUS_NoAddrsAvail,
                     0, 0);
}

// This test verifies that incoming REQUEST can be handled properly when
// there are no subnets configured.
//
// This test sends a REQUEST and the expected response
// is an REPLY with STATUS_NoAddrsAvail and no address provided in the
// response
TEST_F(NakedDhcpv6SrvTest, RequestNoSubnet) {
    NakedDhcpv6Srv srv(0);

    // Let's create a REQUEST
    Pkt6Ptr req = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 1234));
    req->setRemoteAddr(IOAddress("fe80::abcd"));
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, 234, 1500, 3000);

    // with a hint
    IOAddress hint("2001:db8:1:1::dead:beef");
    OptionPtr hint_opt(new Option6IAAddr(D6O_IAADDR, hint, 300, 500));
    ia->addOption(hint_opt);
    req->addOption(ia);
    OptionPtr clientid = generateClientId();
    req->addOption(clientid);

    // server-id is mandatory in REQUEST
    req->addOption(srv.getServerID());

    // Pass it to the server and hope for a REPLY
    Pkt6Ptr reply = srv.processRequest(req);

    // check that we get the right NAK
    checkNakResponse (reply, DHCPV6_REPLY, 1234, STATUS_NoAddrsAvail,
                      0, 0);
}

// This test verifies that incoming RENEW can be handled properly, even when
// no subnets are configured.
//
// This test sends a RENEW and the expected response
// is an REPLY with STATUS_NoBinding and no address provided in the
// response
TEST_F(NakedDhcpv6SrvTest, RenewNoSubnet) {
    NakedDhcpv6Srv srv(0);

    const IOAddress addr("2001:db8:1:1::cafe:babe");
    const uint32_t iaid = 234;

    // Generate client-id also duid_
    OptionPtr clientid = generateClientId();

    // Let's create a RENEW
    Pkt6Ptr req = Pkt6Ptr(new Pkt6(DHCPV6_RENEW, 1234));
    req->setRemoteAddr(IOAddress("fe80::abcd"));
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, iaid, 1500, 3000);

    OptionPtr renewed_addr_opt(new Option6IAAddr(D6O_IAADDR, addr, 300, 500));
    ia->addOption(renewed_addr_opt);
    req->addOption(ia);
    req->addOption(clientid);

    // Server-id is mandatory in RENEW
    req->addOption(srv.getServerID());

    // Pass it to the server and hope for a REPLY
    Pkt6Ptr reply = srv.processRenew(req);

    // check that we get the right NAK
    checkNakResponse (reply, DHCPV6_REPLY, 1234, STATUS_NoBinding,
                      0, 0);
}

// This test verifies that incoming RELEASE can be handled properly, even when
// no subnets are configured.
//
// This test sends a RELEASE and the expected response
// is an REPLY with STATUS_NoBinding and no address provided in the
// response
TEST_F(NakedDhcpv6SrvTest, ReleaseNoSubnet) {
    NakedDhcpv6Srv srv(0);

    const IOAddress addr("2001:db8:1:1::cafe:babe");
    const uint32_t iaid = 234;

    // Generate client-id also duid_
    OptionPtr clientid = generateClientId();

    // Let's create a RELEASE
    Pkt6Ptr req = Pkt6Ptr(new Pkt6(DHCPV6_RELEASE, 1234));
    req->setRemoteAddr(IOAddress("fe80::abcd"));
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, iaid, 1500, 3000);

    OptionPtr released_addr_opt(new Option6IAAddr(D6O_IAADDR, addr, 300, 500));
    ia->addOption(released_addr_opt);
    req->addOption(ia);
    req->addOption(clientid);

    // Server-id is mandatory in RELEASE
    req->addOption(srv.getServerID());

    // Pass it to the server and hope for a REPLY
    Pkt6Ptr reply = srv.processRelease(req);

    // check that we get the right NAK
    checkNakResponse (reply, DHCPV6_REPLY, 1234, STATUS_NoBinding, 0, 0);
}

// Test verifies that the Dhcpv6_srv class can be instantiated. It checks a mode
// without open sockets and with sockets opened on a high port (to not require
// root privileges).
TEST_F(Dhcpv6SrvTest, basic) {
    boost::scoped_ptr<Dhcpv6Srv> srv;

    ASSERT_NO_THROW( {
        // Skip opening any sockets
        srv.reset(new NakedDhcpv6Srv(0));
    });
    srv.reset();
    ASSERT_NO_THROW({
        // open an unprivileged port
        srv.reset(new NakedDhcpv6Srv(DHCP6_SERVER_PORT + 10000));
    });
}

// Test checks that DUID is generated properly
TEST_F(Dhcpv6SrvTest, DUID) {

    boost::scoped_ptr<Dhcpv6Srv> srv;
    ASSERT_NO_THROW( {
        srv.reset(new NakedDhcpv6Srv(0));
    });

    OptionPtr srvid = srv->getServerID();
    ASSERT_TRUE(srvid);

    EXPECT_EQ(D6O_SERVERID, srvid->getType());

    OutputBuffer buf(32);
    srvid->pack(buf);

    // length of the actual DUID
    size_t len = buf.getLength() - srvid->getHeaderLen();

    InputBuffer data(buf.getData(), buf.getLength());

    // ignore first four bytes (standard DHCPv6 header)
    data.readUint32();

    uint16_t duid_type = data.readUint16();
    cout << "Duid-type=" << duid_type << endl;
    switch(duid_type) {
    case DUID::DUID_LLT: {
        // DUID must contain at least 6 bytes long MAC
        // + 8 bytes of fixed header
        EXPECT_GE(len, 14);

        uint16_t hw_type = data.readUint16();
        // there's no real way to find out "correct"
        // hardware type
        EXPECT_GT(hw_type, 0);

        // check that timer is counted since 1.1.2000,
        // not from 1.1.1970.
        uint32_t seconds = data.readUint32();
        EXPECT_LE(seconds, DUID_TIME_EPOCH);
        // this test will start failing after 2030.
        // Hopefully we will be at BIND12 by then.

        // MAC must not be zeros
        vector<uint8_t> mac(len-8);
        vector<uint8_t> zeros(len-8, 0);
        data.readVector(mac, len-8);
        EXPECT_TRUE(mac != zeros);
        break;
    }
    case DUID::DUID_EN: {
        // there's not much we can check. Just simple
        // check if it is not all zeros
        vector<uint8_t> content(len-2);
        data.readVector(content, len-2);
        EXPECT_FALSE(isRangeZero(content.begin(), content.end()));
        break;
    }
    case DUID::DUID_LL: {
        // not supported yet
        cout << "Test not implemented for DUID-LL." << endl;

        // No failure here. There's really no way for test LL DUID. It doesn't
        // even make sense to check if that Link Layer is actually present on
        // a physical interface. RFC3315 says a server should write its DUID
        // and keep it despite hardware changes.
        break;
    }
    case DUID::DUID_UUID: // not supported yet
    default:
        ADD_FAILURE() << "Not supported duid type=" << duid_type << endl;
        break;
    }
}

// This test checks if Option Request Option (ORO) is parsed correctly
// and the requested options are actually assigned.
TEST_F(Dhcpv6SrvTest, advertiseOptions) {

    IfaceMgrTestConfig test_config(true);

    ConstElementPtr x;
    ASSERT_NO_THROW(configure(CONFIGS[0]));

    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->setIface("eth0");
    sol->addOption(generateIA(D6O_IA_NA, 234, 1500, 3000));
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr adv = srv_.processSolicit(sol);

    // check if we get response at all
    ASSERT_TRUE(adv);

    // We have not requested any options so they should not
    // be included in the response.
    ASSERT_FALSE(adv->getOption(D6O_SUBSCRIBER_ID));
    ASSERT_FALSE(adv->getOption(D6O_NAME_SERVERS));

    // Let's now request some options. We expect that the server
    // will include them in its response.
    boost::shared_ptr<OptionIntArray<uint16_t> >
        option_oro(new OptionIntArray<uint16_t>(Option::V6, D6O_ORO));
    // Create vector with two option codes.
    std::vector<uint16_t> codes(2);
    codes[0] = D6O_SUBSCRIBER_ID;
    codes[1] = D6O_NAME_SERVERS;
    // Pass this code to option.
    option_oro->setValues(codes);
    // Append ORO to SOLICIT message.
    sol->addOption(option_oro);

    // Need to process SOLICIT again after requesting new option.
    adv = srv_.processSolicit(sol);
    ASSERT_TRUE(adv);

    OptionPtr tmp = adv->getOption(D6O_NAME_SERVERS);
    ASSERT_TRUE(tmp);

    boost::shared_ptr<Option6AddrLst> reply_nameservers =
        boost::dynamic_pointer_cast<Option6AddrLst>(tmp);
    ASSERT_TRUE(reply_nameservers);

    Option6AddrLst::AddressContainer addrs = reply_nameservers->getAddresses();
    ASSERT_EQ(2, addrs.size());
    EXPECT_TRUE(addrs[0] == IOAddress("2001:db8:1234:FFFF::1"));
    EXPECT_TRUE(addrs[1] == IOAddress("2001:db8:1234:FFFF::2"));

    // There is a dummy option with code 1000 we requested from a server.
    // Expect that this option is in server's response.
    tmp = adv->getOption(D6O_SUBSCRIBER_ID);
    ASSERT_TRUE(tmp);

    // Check that the option contains valid data (from configuration).
    std::vector<uint8_t> data = tmp->getData();
    ASSERT_EQ(2, data.size());

    const uint8_t foo_expected[] = {
        0x12, 0x34
    };
    EXPECT_EQ(0, memcmp(&data[0], foo_expected, 2));

    // more checks to be implemented
}


// There are no dedicated tests for Dhcpv6Srv::handleIA_NA and Dhcpv6Srv::assignLeases
// as they are indirectly tested in Solicit and Request tests.

// This test verifies that incoming SOLICIT can be handled properly, that an
// ADVERTISE is generated, that the response has an address and that address
// really belongs to the configured pool.
//
// This test sends a SOLICIT without any hint in IA_NA.
//
// constructed very simple SOLICIT message with:
// - client-id option (mandatory)
// - IA option (a request for address, without any addresses)
//
// expected returned ADVERTISE message:
// - copy of client-id
// - server-id
// - IA that includes IAADDR
TEST_F(Dhcpv6SrvTest, SolicitBasic) {
    NakedDhcpv6Srv srv(0);

    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->setIface("eth0");
    sol->addOption(generateIA(D6O_IA_NA, 234, 1500, 3000));
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply = srv.processSolicit(sol);

    // check if we get response at all
    checkResponse(reply, DHCPV6_ADVERTISE, 1234);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr = checkIA_NA(reply, 234, subnet_->getT1(),
                                                subnet_->getT2());
    ASSERT_TRUE(addr);

    // Check that the assigned address is indeed from the configured pool
    checkIAAddr(addr, addr->getAddress(), Lease::TYPE_NA);

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);
}

// This test verifies that incoming SOLICIT can be handled properly, that an
// ADVERTISE is generated, that the response has a prefix and that prefix
// really belongs to the configured pool.
//
// This test sends a SOLICIT without any hint in IA_PD.
//
// constructed very simple SOLICIT message with:
// - client-id option (mandatory)
// - IA option (a request for address, without any addresses)
//
// expected returned ADVERTISE message:
// - copy of client-id
// - server-id
// - IA that includes IAPREFIX
TEST_F(Dhcpv6SrvTest, pdSolicitBasic) {

    NakedDhcpv6Srv srv(0);

    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->setIface("eth0");
    sol->addOption(generateIA(D6O_IA_PD, 234, 1500, 3000));
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply = srv.processSolicit(sol);

    // check if we get response at all
    checkResponse(reply, DHCPV6_ADVERTISE, 1234);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAPrefix> prefix = checkIA_PD(reply, 234, subnet_->getT1(),
                                                           subnet_->getT2());
    ASSERT_TRUE(prefix);

    // Check that the assigned prefix is indeed from the configured pool
    checkIAAddr(prefix, prefix->getAddress(), Lease::TYPE_PD);
    EXPECT_EQ(pd_pool_->getLength(), prefix->getLength());

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);
}

// This test verifies that incoming SOLICIT can be handled properly, that an
// ADVERTISE is generated, that the response has an address and that address
// really belongs to the configured pool.
//
// This test sends a SOLICIT with IA_NA that contains a valid hint.
//
// constructed very simple SOLICIT message with:
// - client-id option (mandatory)
// - IA option (a request for address, with an address that belongs to the
//              configured pool, i.e. is valid as hint)
//
// expected returned ADVERTISE message:
// - copy of client-id
// - server-id
// - IA that includes IAADDR
TEST_F(Dhcpv6SrvTest, SolicitHint) {
    NakedDhcpv6Srv srv(0);

    // Let's create a SOLICIT
    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->setIface("eth0");
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, 234, 1500, 3000);

    // with a valid hint
    IOAddress hint("2001:db8:1:1::dead:beef");
    ASSERT_TRUE(subnet_->inPool(Lease::TYPE_NA, hint));
    OptionPtr hint_opt(new Option6IAAddr(D6O_IAADDR, hint, 300, 500));
    ia->addOption(hint_opt);
    sol->addOption(ia);
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply = srv.processSolicit(sol);

    // check if we get response at all
    checkResponse(reply, DHCPV6_ADVERTISE, 1234);

    OptionPtr tmp = reply->getOption(D6O_IA_NA);
    ASSERT_TRUE(tmp);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr = checkIA_NA(reply, 234, subnet_->getT1(),
                                                subnet_->getT2());
    ASSERT_TRUE(addr);

    // check that we've got the address we requested
    checkIAAddr(addr, hint, Lease::TYPE_NA);

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);
}

// This test verifies that incoming SOLICIT can be handled properly, that an
// ADVERTISE is generated, that the response has an address and that address
// really belongs to the configured pool.
//
// This test sends a SOLICIT with IA_NA that contains an invalid hint.
//
// constructed very simple SOLICIT message with:
// - client-id option (mandatory)
// - IA option (a request for address, with an address that does not
//              belong to the configured pool, i.e. is valid as hint)
//
// expected returned ADVERTISE message:
// - copy of client-id
// - server-id
// - IA that includes IAADDR
TEST_F(Dhcpv6SrvTest, SolicitInvalidHint) {
    NakedDhcpv6Srv srv(0);

    // Let's create a SOLICIT
    Pkt6Ptr sol = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    sol->setRemoteAddr(IOAddress("fe80::abcd"));
    sol->setIface("eth0");
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, 234, 1500, 3000);
    IOAddress hint("2001:db8:1::cafe:babe");
    ASSERT_FALSE(subnet_->inPool(Lease::TYPE_NA, hint));
    OptionPtr hint_opt(new Option6IAAddr(D6O_IAADDR, hint, 300, 500));
    ia->addOption(hint_opt);
    sol->addOption(ia);
    OptionPtr clientid = generateClientId();
    sol->addOption(clientid);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply = srv.processSolicit(sol);

    // check if we get response at all
    checkResponse(reply, DHCPV6_ADVERTISE, 1234);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr = checkIA_NA(reply, 234, subnet_->getT1(),
                                                subnet_->getT2());
    ASSERT_TRUE(addr);

    // Check that the assigned address is indeed from the configured pool
    checkIAAddr(addr, addr->getAddress(), Lease::TYPE_NA);
    EXPECT_TRUE(subnet_->inPool(Lease::TYPE_NA, addr->getAddress()));

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);
}

/// @todo: Add a test that client sends hint that is in pool, but currently
/// being used by a different client.

// This test checks that the server is offering different addresses to different
// clients in ADVERTISEs. Please note that ADVERTISE is not a guarantee that such
// an address will be assigned. Had the pool was very small and contained only
// 2 addresses, the third client would get the same advertise as the first one
// and this is a correct behavior. It is REQUEST that will fail for the third
// client. ADVERTISE is basically saying "if you send me a request, you will
// probably get an address like this" (there are no guarantees).
TEST_F(Dhcpv6SrvTest, ManySolicits) {
    NakedDhcpv6Srv srv(0);

    Pkt6Ptr sol1 = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 1234));
    Pkt6Ptr sol2 = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 2345));
    Pkt6Ptr sol3 = Pkt6Ptr(new Pkt6(DHCPV6_SOLICIT, 3456));

    sol1->setRemoteAddr(IOAddress("fe80::abcd"));
    sol2->setRemoteAddr(IOAddress("fe80::1223"));
    sol3->setRemoteAddr(IOAddress("fe80::3467"));

    sol1->setIface("eth0");
    sol2->setIface("eth0");
    sol3->setIface("eth0");

    sol1->addOption(generateIA(D6O_IA_NA, 1, 1500, 3000));
    sol2->addOption(generateIA(D6O_IA_NA, 2, 1500, 3000));
    sol3->addOption(generateIA(D6O_IA_NA, 3, 1500, 3000));

    // different client-id sizes
    OptionPtr clientid1 = generateClientId(12);
    OptionPtr clientid2 = generateClientId(14);
    OptionPtr clientid3 = generateClientId(16);

    sol1->addOption(clientid1);
    sol2->addOption(clientid2);
    sol3->addOption(clientid3);

    // Pass it to the server and get an advertise
    Pkt6Ptr reply1 = srv.processSolicit(sol1);
    Pkt6Ptr reply2 = srv.processSolicit(sol2);
    Pkt6Ptr reply3 = srv.processSolicit(sol3);

    // check if we get response at all
    checkResponse(reply1, DHCPV6_ADVERTISE, 1234);
    checkResponse(reply2, DHCPV6_ADVERTISE, 2345);
    checkResponse(reply3, DHCPV6_ADVERTISE, 3456);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr1 = checkIA_NA(reply1, 1, subnet_->getT1(),
                                                subnet_->getT2());
    boost::shared_ptr<Option6IAAddr> addr2 = checkIA_NA(reply2, 2, subnet_->getT1(),
                                                subnet_->getT2());
    boost::shared_ptr<Option6IAAddr> addr3 = checkIA_NA(reply3, 3, subnet_->getT1(),
                                                subnet_->getT2());
    ASSERT_TRUE(addr1);
    ASSERT_TRUE(addr2);
    ASSERT_TRUE(addr3);

    // Check that the assigned address is indeed from the configured pool
    checkIAAddr(addr1, addr1->getAddress(), Lease::TYPE_NA);
    checkIAAddr(addr2, addr2->getAddress(), Lease::TYPE_NA);
    checkIAAddr(addr3, addr3->getAddress(), Lease::TYPE_NA);

    // check DUIDs
    checkServerId(reply1, srv.getServerID());
    checkServerId(reply2, srv.getServerID());
    checkServerId(reply3, srv.getServerID());
    checkClientId(reply1, clientid1);
    checkClientId(reply2, clientid2);
    checkClientId(reply3, clientid3);

    // Finally check that the addresses offered are different
    EXPECT_NE(addr1->getAddress(), addr2->getAddress());
    EXPECT_NE(addr2->getAddress(), addr3->getAddress());
    EXPECT_NE(addr3->getAddress(), addr1->getAddress());
    cout << "Offered address to client1=" << addr1->getAddress() << endl;
    cout << "Offered address to client2=" << addr2->getAddress() << endl;
    cout << "Offered address to client3=" << addr3->getAddress() << endl;
}

// This test verifies that incoming REQUEST can be handled properly, that a
// REPLY is generated, that the response has an address and that address
// really belongs to the configured pool.
//
// This test sends a REQUEST with IA_NA that contains a valid hint.
//
// constructed very simple REQUEST message with:
// - client-id option (mandatory)
// - IA option (a request for address, with an address that belongs to the
//              configured pool, i.e. is valid as hint)
//
// expected returned REPLY message:
// - copy of client-id
// - server-id
// - IA that includes IAADDR
TEST_F(Dhcpv6SrvTest, RequestBasic) {
    NakedDhcpv6Srv srv(0);

    // Let's create a REQUEST
    Pkt6Ptr req = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 1234));
    req->setRemoteAddr(IOAddress("fe80::abcd"));
    req->setIface("eth0");
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_NA, 234, 1500, 3000);

    // with a valid hint
    IOAddress hint("2001:db8:1:1::dead:beef");
    ASSERT_TRUE(subnet_->inPool(Lease::TYPE_NA, hint));
    OptionPtr hint_opt(new Option6IAAddr(D6O_IAADDR, hint, 300, 500));
    ia->addOption(hint_opt);
    req->addOption(ia);
    OptionPtr clientid = generateClientId();
    req->addOption(clientid);

    // server-id is mandatory in REQUEST
    req->addOption(srv.getServerID());

    // Pass it to the server and hope for a REPLY
    Pkt6Ptr reply = srv.processRequest(req);

    // check if we get response at all
    checkResponse(reply, DHCPV6_REPLY, 1234);

    OptionPtr tmp = reply->getOption(D6O_IA_NA);
    ASSERT_TRUE(tmp);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr = checkIA_NA(reply, 234,
                                                       subnet_->getT1(),
                                                       subnet_->getT2());
    ASSERT_TRUE(addr);

    // check that we've got the address we requested
    checkIAAddr(addr, hint, Lease::TYPE_NA);

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);

    // check that the lease is really in the database
    Lease6Ptr l = checkLease(duid_, reply->getOption(D6O_IA_NA), addr);
    EXPECT_TRUE(l);
    LeaseMgrFactory::instance().deleteLease(addr->getAddress());
}

// This test verifies that incoming REQUEST can be handled properly, that a
// REPLY is generated, that the response has a prefix and that prefix
// really belongs to the configured pool.
//
// This test sends a REQUEST with IA_PD that contains a valid hint.
//
// constructed very simple REQUEST message with:
// - client-id option (mandatory)
// - IA option (a request for address, with an address that belongs to the
//              configured pool, i.e. is valid as hint)
//
// expected returned REPLY message:
// - copy of client-id
// - server-id
// - IA that includes IAPREFIX
TEST_F(Dhcpv6SrvTest, pdRequestBasic) {

    NakedDhcpv6Srv srv(0);

    // Let's create a REQUEST
    Pkt6Ptr req = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 1234));
    req->setRemoteAddr(IOAddress("fe80::abcd"));
    req->setIface("eth0");
    boost::shared_ptr<Option6IA> ia = generateIA(D6O_IA_PD, 234, 1500, 3000);

    // with a valid hint
    IOAddress hint("2001:db8:1:2:f::");
    ASSERT_TRUE(subnet_->inPool(Lease::TYPE_PD, hint));
    OptionPtr hint_opt(new Option6IAPrefix(D6O_IAPREFIX, hint, 64, 300, 500));
    ia->addOption(hint_opt);
    req->addOption(ia);
    OptionPtr clientid = generateClientId();
    req->addOption(clientid);

    // server-id is mandatory in REQUEST
    req->addOption(srv.getServerID());

    // Pass it to the server and hope for a REPLY
    Pkt6Ptr reply = srv.processRequest(req);

    // check if we get response at all
    checkResponse(reply, DHCPV6_REPLY, 1234);

    OptionPtr tmp = reply->getOption(D6O_IA_PD);
    ASSERT_TRUE(tmp);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAPrefix> prf = checkIA_PD(reply, 234,
                                                        subnet_->getT1(),
                                                        subnet_->getT2());
    ASSERT_TRUE(prf);

    // check that we've got the address we requested
    checkIAAddr(prf, hint, Lease::TYPE_PD);
    EXPECT_EQ(pd_pool_->getLength(), prf->getLength());

    // check DUIDs
    checkServerId(reply, srv.getServerID());
    checkClientId(reply, clientid);

    // check that the lease is really in the database
    Lease6Ptr l = checkPdLease(duid_, reply->getOption(D6O_IA_PD), prf);
    EXPECT_TRUE(l);
    EXPECT_TRUE(LeaseMgrFactory::instance().deleteLease(prf->getAddress()));
}

// This test checks that the server is offering different addresses to different
// clients in REQUEST. Please note that ADVERTISE is not a guarantee that such
// and address will be assigned. Had the pool was very small and contained only
// 2 addresses, the third client would get the same advertise as the first one
// and this is a correct behavior. It is REQUEST that will fail for the third
// client. ADVERTISE is basically saying "if you send me a request, you will
// probably get an address like this" (there are no guarantees).
TEST_F(Dhcpv6SrvTest, ManyRequests) {
    NakedDhcpv6Srv srv(0);

    ASSERT_TRUE(subnet_);

    Pkt6Ptr req1 = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 1234));
    Pkt6Ptr req2 = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 2345));
    Pkt6Ptr req3 = Pkt6Ptr(new Pkt6(DHCPV6_REQUEST, 3456));

    req1->setRemoteAddr(IOAddress("fe80::abcd"));
    req2->setRemoteAddr(IOAddress("fe80::1223"));
    req3->setRemoteAddr(IOAddress("fe80::3467"));

    req1->setIface("eth0");
    req2->setIface("eth0");
    req3->setIface("eth0");

    req1->addOption(generateIA(D6O_IA_NA, 1, 1500, 3000));
    req2->addOption(generateIA(D6O_IA_NA, 2, 1500, 3000));
    req3->addOption(generateIA(D6O_IA_NA, 3, 1500, 3000));

    // different client-id sizes
    OptionPtr clientid1 = generateClientId(12);
    OptionPtr clientid2 = generateClientId(14);
    OptionPtr clientid3 = generateClientId(16);

    req1->addOption(clientid1);
    req2->addOption(clientid2);
    req3->addOption(clientid3);

    // server-id is mandatory in REQUEST
    req1->addOption(srv.getServerID());
    req2->addOption(srv.getServerID());
    req3->addOption(srv.getServerID());

    // Pass it to the server and get an advertise
    Pkt6Ptr reply1 = srv.processRequest(req1);
    Pkt6Ptr reply2 = srv.processRequest(req2);
    Pkt6Ptr reply3 = srv.processRequest(req3);

    // check if we get response at all
    checkResponse(reply1, DHCPV6_REPLY, 1234);
    checkResponse(reply2, DHCPV6_REPLY, 2345);
    checkResponse(reply3, DHCPV6_REPLY, 3456);

    // check that IA_NA was returned and that there's an address included
    boost::shared_ptr<Option6IAAddr> addr1 = checkIA_NA(reply1, 1, subnet_->getT1(),
                                                subnet_->getT2());
    boost::shared_ptr<Option6IAAddr> addr2 = checkIA_NA(reply2, 2, subnet_->getT1(),
                                                subnet_->getT2());
    boost::shared_ptr<Option6IAAddr> addr3 = checkIA_NA(reply3, 3, subnet_->getT1(),
                                                subnet_->getT2());

    ASSERT_TRUE(addr1);
    ASSERT_TRUE(addr2);
    ASSERT_TRUE(addr3);

    // Check that the assigned address is indeed from the configured pool
    checkIAAddr(addr1, addr1->getAddress(), Lease::TYPE_NA);
    checkIAAddr(addr2, addr2->getAddress(), Lease::TYPE_NA);
    checkIAAddr(addr3, addr3->getAddress(), Lease::TYPE_NA);

    // check DUIDs
    checkServerId(reply1, srv.getServerID());
    checkServerId(reply2, srv.getServerID());
    checkServerId(reply3, srv.getServerID());
    checkClientId(reply1, clientid1);
    checkClientId(reply2, clientid2);
    checkClientId(reply3, clientid3);

    // Finally check that the addresses offered are different
    EXPECT_NE(addr1->getAddress(), addr2->getAddress());
    EXPECT_NE(addr2->getAddress(), addr3->getAddress());
    EXPECT_NE(addr3->getAddress(), addr1->getAddress());
    cout << "Assigned address to client1=" << addr1->getAddress() << endl;
    cout << "Assigned address to client2=" << addr2->getAddress() << endl;
    cout << "Assigned address to client3=" << addr3->getAddress() << endl;
}

// This test verifies that incoming (positive) RENEW can be handled properly, that a
// REPLY is generated, that the response has an address and that address
// really belongs to the configured pool and that lease is actually renewed.
//
// expected:
// - returned REPLY message has copy of client-id
// - returned REPLY message has server-id
// - returned REPLY message has IA_NA that includes IAADDR
// - lease is actually renewed in LeaseMgr
TEST_F(Dhcpv6SrvTest, renewBasic) {
    testRenewBasic(Lease::TYPE_NA, "2001:db8:1:1::cafe:babe",
                   "2001:db8:1:1::cafe:babe", 128);
}

// This test verifies that incoming (positive) PD RENEW can be handled properly,
// that a REPLY is generated, that the response has a prefix and that prefix
// really belongs to the configured pool and that lease is actually renewed.
//
// expected:
// - returned REPLY message has copy of client-id
// - returned REPLY message has server-id
// - returned REPLY message has IA_PD that includes IAPREFIX
// - lease is actually renewed in LeaseMgr
TEST_F(Dhcpv6SrvTest, pdRenewBasic) {
    testRenewBasic(Lease::TYPE_PD, "2001:db8:1:2::",
                   "2001:db8:1:2::", pd_pool_->getLength());
}

// This test verifies that incoming (invalid) RENEW with an address
// can be handled properly. This has changed with #3565. The server
// is now able to allocate a lease in Renew if it's available.
// Previous testRenewReject is now split into 3 tests.
//
// This test checks the first scenario: There is no lease at all.
// The server will try to assign it. Since it is not used by anyone else,
// the server will assign it. This is convenient for various types
// of recoveries, e.g. when the server lost its database.
TEST_F(Dhcpv6SrvTest, RenewUnknown) {
    // False means that the lease should not be created before renewal attempt
    testRenewBasic(Lease::TYPE_NA, "2001:db8:1:1::abc", "2001:db8:1:1::abc",
                   128, false);
}

// This test checks that a client that renews existing lease, but uses
// a wrong IAID, will be processed correctly. As there is no lease for
// this (duid, type, iaid) tuple, this is treated as a new IA, regardless
// if the client inserted an address that is used in a different IA.
// After #3565 was implemented, the server will attempt to assign a lease.
// The one that client requested is already used with different IAID, so
// it will just pick a different lease. This is the second out of three
// scenarios tests by old RenewReject test.
TEST_F(Dhcpv6SrvTest, RenewWrongIAID) {
    testRenewWrongIAID(Lease::TYPE_NA, IOAddress("2001:db8:1:1::abc"));
}

// This test checks whether client A can renew an address that is currently
// leased by client B. The server should detect that the lease belong to
// someone else and assign a different lease. This is the third out of three
// scenarios tests by old RenewReject test.
TEST_F(Dhcpv6SrvTest, RenewSomeoneElesesLease) {
    testRenewSomeoneElsesLease(Lease::TYPE_NA, IOAddress("2001:db8::1"));