[master] Merge branch 'trac5272' (lease_cmds hook added)

configure.ac

@@ -1630,6 +1630,8 @@ AC_CONFIG_FILES([Makefile
                  src/bin/shell/tests/shell_unittest.py
                  src/hooks/Makefile
                  src/hooks/dhcp/Makefile
+                 src/hooks/dhcp/lease_cmds/Makefile
+                 src/hooks/dhcp/lease_cmds/tests/Makefile
                  src/hooks/dhcp/user_chk/Makefile
                  src/hooks/dhcp/user_chk/tests/Makefile
                  src/hooks/dhcp/user_chk/tests/test_data_files_config.h

src/hooks/dhcp/Makefile.am

-SUBDIRS = user_chk
+SUBDIRS = user_chk lease_cmds

src/hooks/dhcp/lease_cmds/.gitignore

+/lease_cmds_messages.cc
+/lease_cmds_messages.h
+/s-messages
+/html

src/hooks/dhcp/lease_cmds/Makefile.am

+SUBDIRS = . tests
+
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Define rule to build logging source files from message file
+lease_cmds_messages.h lease_cmds_messages.cc: s-messages
+s-messages: lease_cmds_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/hooks/dhcp/lease_cmds/lease_cmds_messages.mes
+	touch $@
+
+# Tell automake that the message files are built as part of the build process
+# (so that they are built before the main library is built).
+BUILT_SOURCES = lease_cmds_messages.h lease_cmds_messages.cc
+
+# Ensure that the message file is included in the distribution
+EXTRA_DIST = lease_cmds_messages.mes
+
+# Get rid of generated message files on a clean
+CLEANFILES = *.gcno *.gcda lease_cmds_messages.h lease_cmds_messages.cc s-messages
+
+# convenience archive
+
+noinst_LTLIBRARIES = liblease_cmds.la
+
+liblease_cmds_la_SOURCES  = lease_cmds.cc lease_cmds.h
+liblease_cmds_la_SOURCES += lease_parser.h lease_parser.cc
+liblease_cmds_la_SOURCES += lease_cmds_log.cc lease_cmds_log.h
+liblease_cmds_la_SOURCES += load_unload.cc
+liblease_cmds_la_SOURCES += version.cc
+
+nodist_liblease_cmds_la_SOURCES = lease_cmds_messages.cc lease_cmds_messages.h
+
+liblease_cmds_la_CXXFLAGS = $(AM_CXXFLAGS)
+liblease_cmds_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/hooks
+lib_hooksdir = $(libdir)/hooks
+lib_hooks_LTLIBRARIES = libdhcp_lease_cmds.la
+
+libdhcp_lease_cmds_la_SOURCES  =
+libdhcp_lease_cmds_la_LDFLAGS  = $(AM_LDFLAGS)
+libdhcp_lease_cmds_la_LDFLAGS  += -avoid-version -export-dynamic -module
+libdhcp_lease_cmds_la_LIBADD  = liblease_cmds.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/cc/libkea-cc.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/eval/libkea-eval.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/stats/libkea-stats.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/log/libkea-log.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/util/threads/libkea-threads.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/util/libkea-util.la
+libdhcp_lease_cmds_la_LIBADD  += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libdhcp_lease_cmds_la_LIBADD  += $(LOG4CPLUS_LIBS)
+libdhcp_lease_cmds_la_LIBADD  += $(CRYPTO_LIBS)
+libdhcp_lease_cmds_la_LIBADD  += $(BOOST_LIBS)

src/hooks/dhcp/lease_cmds/lease_cmds.h

+// Copyright (C) 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/.
+
+#ifndef LEASE_CMDS_H
+#define LEASE_CMDS_H
+
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace lease_cmds {
+
+/// @brief Forward declaration of implementation class.
+class LeaseCmdsImpl;
+
+/// @brief A wrapper class that provides convenient initialization to the library.
+///
+/// This is a wrapper class that simply registers extra commands when
+/// instantiated and deregisters them when the instance is destroyed.
+///
+/// For an actual implementation, see @ref LeaseCmdsImpl class in lease_cmds.cc file.
+class LeaseCmds {
+public:
+
+    /// @brief Initializes additional lease commands.
+    ///
+    /// It registers the following commands:
+    /// - lease4-add
+    /// - lease6-add
+    /// - lease4-get
+    /// - lease6-get
+    /// - lease4-del
+    /// - lease6-del
+    /// - lease4-update
+    /// - lease6-update
+    /// - lease4-del-all
+    /// - lease6-del-all
+    ///
+    /// @throw Unexpected If any of the above fails.
+    LeaseCmds();
+
+    /// @brief Destructor
+    ///
+    /// Unregisters commands:
+    /// - lease4-add
+    /// - lease6-add
+    /// - lease4-get
+    /// - lease6-get
+    /// - lease4-del
+    /// - lease6-del
+    /// - lease4-update
+    /// - lease6-update
+    /// - lease4-del-all
+    /// - lease6-del-all
+    ~LeaseCmds();
+private:
+
+    /// Pointer to the actual implementation
+    boost::shared_ptr<LeaseCmdsImpl> impl_;
+};
+
+};
+};
+
+#endif

src/hooks/dhcp/lease_cmds/lease_cmds_log.cc

+// Copyright (C) 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 <lease_cmds_log.h>
+
+namespace isc {
+namespace lease_cmds {
+
+isc::log::Logger lease_cmds_logger("lease_cmds_hooks");
+
+}
+}
+

src/hooks/dhcp/lease_cmds/lease_cmds_log.h

+// Copyright (C) 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/.
+
+#ifndef LEASE_CMD_LOG_H
+#define LEASE_CMD_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <lease_cmds_messages.h>
+
+namespace isc {
+namespace lease_cmds {
+
+extern isc::log::Logger lease_cmds_logger;
+
+} // end of isc::lease_cmds
+} // end of isc namespace
+
+
+#endif

src/hooks/dhcp/lease_cmds/lease_cmds_messages.mes

+# Copyright (C) 2017 Internet Systems Consortium, Inc. ("ISC")
+
+% LEASE_CMDS_INIT_FAILED loading Lease Commands hooks library failed: %1
+This error message indicates an error during loading the Lease Commands
+hooks library. The details of the error are provided as argument of
+the log message.
+
+% LEASE_CMDS_INIT_OK loading Lease Commands hooks library successful
+This info message indicates that the Lease Commands hooks library has been
+loaded successfully. Enjoy!
+
+% LEASE_CMDS_DEINIT_FAILED unloading Lease Commands hooks library failed: %1
+This error message indicates an error during unloading the Lease Commands
+hooks library. The details of the error are provided as argument of
+the log message.
+
+% LEASE_CMDS_DEINIT_OK unloading Lease Commands hooks library successful
+This info message indicates that the Lease Commands hooks library has been
+removed successfully.
+
+% LEASE_CMDS_ADD4_FAILED lease4-add command failed (parameters: %1, reason: %2)
+The lease4-add command has failed. Both the reason as well as the
+parameters passed are logged.
+
+% LEASE_CMDS_ADD6_FAILED Lease6-add command failed (parameters: %1, reason: %2)
+The lease6-add command has failed. Both the reason as well as the
+parameters passed are logged.
+
+% LEASE_CMDS_ADD4 lease4-add command successful (parameters: %1)
+The lease4-add command has been successful. Parameters of the host
+added are logged.
+
+% LEASE_CMDS_ADD6 lease6-add command successful (parameters: %1)
+The lease6-add command has been successful. Parameters of the host
+added are logged.
+
+% LEASE_CMDS_DEL4_FAILED lease4-del command failed (parameters: %1, reason: %2)
+The attempt to delete an IPv4 lease (lease4-del command) has failed. Both the
+reason as well as the parameters passed are logged.
+
+% LEASE_CMDS_DEL6_FAILED lease6-del command failed (parameters: %1, reason: %2)
+The attempt to delete an IPv6 lease (lease4-del command) has failed. Both the
+reason as well as the parameters passed are logged.
+
+% LEASE_CMDS_DEL4 lease4-del command successful (parameters: %1)
+The attempt to delete an IPv4 lease (lease4-del command) has been successful.
+Parameters of the host removed are logged.
+
+% LEASE_CMDS_DEL6 lease4-del command successful (parameters: %1)
+The attempt to delete an IPv4 lease (lease4-del command) has been successful.
+Parameters of the host removed are logged.

src/hooks/dhcp/lease_cmds/lease_parser.cc

+// Copyright (C) 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 <cc/data.h>
+#include <dhcp/hwaddr.h>
+#include <asiolink/io_address.h>
+#include <dhcpsrv/lease.h>
+#include <lease_parser.h>
+
+#include <config.h>
+
+using namespace std;
+using namespace isc::dhcp;
+using namespace isc::data;
+using namespace isc::asiolink;
+
+namespace isc {
+namespace lease_cmds {
+
+Lease4Ptr
+Lease4Parser::parse(ConstSrvConfigPtr& cfg,
+                    const ConstElementPtr& lease_info) {
+    if (!lease_info) {
+        isc_throw(BadValue, "lease information missing");
+    }
+
+    // These are mandatory parameters.
+    IOAddress addr = getAddress(lease_info, "ip-address");
+    SubnetID subnet_id = getUint32(lease_info, "subnet-id");
+
+    if (!addr.isV4()) {
+        isc_throw(BadValue, "Non-IPv4 address specified: " << addr);
+    }
+
+    // Not a most straightforward conversion, but it works.
+    string hwaddr_txt = getString(lease_info, "hw-address");
+    HWAddr hwaddr = HWAddr::fromText(hwaddr_txt);
+    HWAddrPtr hwaddr_ptr = HWAddrPtr(new HWAddr(hwaddr));
+
+    Subnet4Ptr subnet = cfg->getCfgSubnets4()->getSubnet(subnet_id);
+    if (!subnet) {
+        isc_throw(BadValue, "Invalid subnet-id: No IPv4 subnet with subnet-id="
+                  << subnet_id << " currently configured.");
+    }
+
+    if (!subnet->inRange(addr)) {
+        isc_throw(BadValue, "The address " << addr.toText() << " does not belong "
+                  "to subnet " << subnet->toText() << ", subnet-id=" << subnet_id);
+    }
+
+    // Client-id is optional.
+    ClientIdPtr client_id;
+    if (lease_info->contains("client-id")) {
+        string txt = getString(lease_info, "client-id");
+        client_id = ClientId::fromText(txt);
+    }
+
+    // These parameters are optional. If not specified, we'll derive them from
+    // the current subnet configuration, if possible.
+    uint32_t valid_lft = 0;
+    if (lease_info->contains("valid-lft")) {
+        valid_lft = getUint32(lease_info, "valid-lft");
+    } else {
+        valid_lft = subnet->getValid();
+    }
+
+    /// Let's calculate client last transmission time (cltt). If expiration
+    /// timestamp is specified explicitly, we will use that. Note there are no
+    /// checks whether this is in the past. There may be valid cases when user
+    /// wants to insert expired leases, e.g. when migrating from one DHCP server
+    /// to another and wants to migrate the database as is, without discarding
+    /// any leases.
+    time_t cltt;
+    if (lease_info->contains("expire")) {
+        int64_t tmp = getUint32(lease_info, "expire");
+        cltt = static_cast<time_t>(tmp - valid_lft);
+    } else {
+        cltt = time(NULL);
+    }
+
+    bool fqdn_fwd = false;
+    if (lease_info->contains("fqdn-fwd")) {
+        fqdn_fwd = getBoolean(lease_info, "fqdn-fwd");
+    }
+    bool fqdn_rev = false;
+    if (lease_info->contains("fqdn-rev")) {
+        fqdn_rev = getBoolean(lease_info, "fqdn-rev");
+    }
+    string hostname;
+    if (lease_info->contains("hostname")) {
+        hostname = getString(lease_info, "hostname");
+    }
+    if (hostname.empty() && (fqdn_fwd || fqdn_rev)) {
+        isc_throw(BadValue, "No hostname specified and either forward or reverse"
+                  " fqdn was set to true.");
+    }
+
+    uint32_t state = 0;
+    if (lease_info->contains("state")) {
+        state = getUint8(lease_info, "state");
+    }
+
+    // Let's fabricate some data and we're ready to go.
+    uint32_t t1 = subnet->getT1();
+    uint32_t t2 = subnet->getT2();
+
+    Lease4Ptr l(new Lease4(addr, hwaddr_ptr, client_id, valid_lft, t1, t2,
+                           cltt, subnet_id,
+                           fqdn_fwd, fqdn_rev, hostname));
+    l->state_ = state;
+    return (l);
+}
+
+Lease6Ptr
+Lease6Parser::parse(ConstSrvConfigPtr& cfg,
+                    const ConstElementPtr& lease_info) {
+    if (!lease_info) {
+        isc_throw(BadValue, "lease information missing");
+    }
+
+    // These are mandatory parameters.
+    IOAddress addr = getAddress(lease_info, "ip-address");
+    SubnetID subnet_id = getUint32(lease_info, "subnet-id");
+
+    if (addr.isV4()) {
+        isc_throw(BadValue, "Non-IPv6 address specified: " << addr);
+    }
+
+    // Not a most straightforward conversion, but it works.
+    string duid_txt = getString(lease_info, "duid");
+    DUID duid = DUID::fromText(duid_txt);
+    DuidPtr duid_ptr = DuidPtr(new DUID(duid));
+
+    // Check if the subnet-id specified is sane.
+    Subnet6Ptr subnet = cfg->getCfgSubnets6()->getSubnet(subnet_id);
+    if (!subnet) {
+        isc_throw(BadValue, "Invalid subnet-id: No IPv6 subnet with subnet-id="
+                  << subnet_id << " currently configured.");
+    }
+
+    Lease::Type type = Lease::TYPE_NA;
+    uint8_t prefix_len = 128;
+    if (lease_info->contains("type")) {
+        string txt = getString(lease_info, "type");
+        if (txt == "IA_NA") {
+            type = Lease::TYPE_NA;
+        } else if (txt == "IA_TA") {
+            type = Lease::TYPE_TA;
+        } else if (txt == "IA_PD") {
+            type = Lease::TYPE_PD;
+
+            prefix_len = getUint8(lease_info, "prefix-len");
+        } else {
+            isc_throw(BadValue, "Incorrect lease type: " << txt << ", the only "
+                      "supported values are: na, ta and pd");
+        }
+    }
+
+    // Check if the address specified really belongs to the subnet.
+    if ((type == Lease::TYPE_NA) && !subnet->inRange(addr)) {
+        isc_throw(BadValue, "The address " << addr.toText() << " does not belong "
+                  "to subnet " << subnet->toText() << ", subnet-id=" << subnet_id);
+    }
+
+    uint32_t iaid = getUint32(lease_info, "iaid");
+
+    // Hw-address is optional in v6 leases.
+    HWAddrPtr hwaddr_ptr;
+    if (lease_info->contains("hw-address")) {
+        string hwaddr_txt = getString(lease_info, "hw-address");
+        HWAddr hwaddr = HWAddr::fromText(hwaddr_txt);
+        hwaddr_ptr = HWAddrPtr(new HWAddr(hwaddr));
+    }
+
+    // These parameters are optional. If not specified, we'll derive them
+    // from the current subnet configuration, if possible.
+    uint32_t valid_lft = 0;
+    if (lease_info->contains("valid-lft")) {
+        valid_lft = getUint32(lease_info, "valid-lft");
+    } else {
+        valid_lft = subnet->getValid();
+    }
+
+    // These parameters are optional. If not specified, we'll derive them
+    // from the current subnet configuration, if possible.
+    uint32_t pref_lft = 0;
+    if (lease_info->contains("preferred-lft")) {
+        pref_lft = getUint32(lease_info, "preferred-lft");
+    } else {
+        pref_lft = subnet->getValid();
+    }
+
+    /// Let's calculate client last transmission time (cltt). If expiration
+    /// timestamp is specified explicitly, we will use that. Note there are
+    /// no checks whether this is in the past. There may be valid cases when
+    /// user wants to insert expired leases, e.g. when migrating from one
+    /// DHCP server to another and wants to migrate the database as is, without
+    /// discarding any leases.
+    time_t cltt;
+    if (lease_info->contains("expire")) {
+        int64_t tmp = getUint32(lease_info, "expire");
+        cltt = static_cast<time_t>(tmp - valid_lft);
+    } else {
+        cltt = time(NULL);
+    }
+
+    bool fqdn_fwd = false;
+    if (lease_info->contains("fqdn-fwd")) {
+        fqdn_fwd = getBoolean(lease_info, "fqdn-fwd");
+    }
+    bool fqdn_rev = false;
+    if (lease_info->contains("fqdn-rev")) {
+        fqdn_rev = getBoolean(lease_info, "fqdn-rev");
+    }
+    string hostname;
+    if (lease_info->contains("hostname")) {
+        hostname = getString(lease_info, "hostname");
+    }
+    if (hostname.empty() && (fqdn_fwd || fqdn_rev)) {
+        isc_throw(BadValue, "No hostname specified and either forward or reverse"
+                  " fqdn was set to true.");
+    }
+
+    uint32_t state = 0;
+    if (lease_info->contains("state")) {
+        state = getUint8(lease_info, "state");
+    }
+
+    // Let's fabricate some data and we're ready to go.
+    uint32_t t1 = subnet->getT1();
+    uint32_t t2 = subnet->getT2();
+
+    Lease6Ptr l(new Lease6(type, addr, duid_ptr, iaid, pref_lft, valid_lft, t1, t2,
+                           subnet_id, fqdn_fwd, fqdn_rev, hostname,
+                           hwaddr_ptr, prefix_len));
+    l->cltt_ = cltt;
+    l->state_ = state;
+    return (l);
+}
+
+};
+};

src/hooks/dhcp/lease_cmds/lease_parser.h

+// Copyright (C) 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/.
+
+#ifndef LEASE_PARSER_H
+#define LEASE_PARSER_H
+
+#include <cc/data.h>
+#include <cc/simple_parser.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/srv_config.h>
+
+namespace isc {
+namespace lease_cmds {
+
+/// @brief Parser for Lease4 structure
+///
+/// It expects the data in the following format:
+/// {
+///     "ip-address": "192.0.2.1",
+///     "hw-address": "00:01:02:03:04:05",
+///     "client-id": "this-is-a-client",
+///     "valid-lft": 3600,
+///     "cltt": 12345678,
+///     "expire": 1499282530,
+///     "subnet-id": 1,
+///     "fqdn-fwd": true,
+///     "fqdn-rev": true,
+///     "hostname": "myhost.example.org",
+///     "state": 0
+/// }
+class Lease4Parser : public isc::data::SimpleParser {
+public:
+
+    /// @brief Parses Element tree and tries to convert to Lease4
+    ///
+    /// See @ref Lease6Parser class description for expected format.
+    ///
+    /// @param cfg Currently running config (used for sanity checks and defaults)
+    /// @param lease_info structure to be parsed
+    /// @return A pointer to Lease4
+    /// @throw BadValue if any of the parameters is invalid
+    /// @throw DhcpConfigError if mandatory parameter is missing
+    virtual isc::dhcp::Lease4Ptr parse(isc::dhcp::ConstSrvConfigPtr& cfg,
+                                       const isc::data::ConstElementPtr& lease_info);
+
+    /// @brief virtual dtor (does nothing)
+    virtual ~Lease4Parser() {}
+};
+
+/// @brief Parser for Lease6 structure
+///
+/// {
+///     "address": "2001:db8::1",
+///     "duid": "00:01:02:03:04:05",
+///     "type": "IA_NA",
+///     "cltt": 12345678,
+///     "preferred-lft": 3600,
+///     "valid-lft": 3600,
+///     "expire": 1499282530,
+///     "subnet-id": 1,
+///     "fqdn-fwd": true,
+///     "fqdn-rev": true,
+///     "hostname": "myhost.example.org",
+///     "state": 0
+/// }
+
+/// It expects the input data to use the following format:
+class Lease6Parser : public isc::data::SimpleParser {
+public:
+    /// @brief Parses Element tree and tries to convert to Lease4
+    ///
+    /// See @ref Lease6Parser class description for expected format.
+    ///
+    /// @param cfg Currently running config (used for sanity checks and defaults)
+    /// @param lease_info structure to be parsed
+    /// @return A pointer to Lease4
+    /// @throw BadValue if any of the parameters is invalid
+    /// @throw DhcpConfigError if mandatory parameter is missing
+    virtual isc::dhcp::Lease6Ptr parse(isc::dhcp::ConstSrvConfigPtr& cfg,
+                                       const isc::data::ConstElementPtr& lease_info);
+
+    /// @brief virtual dtor (does nothing)
+    virtual ~Lease6Parser() {}
+};
+
+}; // end of isc::dhcp namespace
+}; // end of isc namespace
+
+#endif

src/hooks/dhcp/lease_cmds/load_unload.cc

+// Copyright (C) 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/.
+
+/// @file load_unload.cc Defines the load and unload hooks library functions.
+
+#include <config.h>
+#include <lease_cmds.h>
+#include <lease_cmds_log.h>
+#include <string>
+#include <hooks/hooks.h>
+#include <exceptions/exceptions.h>
+
+using namespace isc::hooks;
+using namespace isc::lease_cmds;
+
+boost::shared_ptr<LeaseCmds> instance;
+
+extern "C" {
+
+/// @brief This function is called when the library is loaded.
+///
+/// This function creates LeaseCmds object that registers
+/// additional commands.
+///
+/// @param handle library handle (ignored)
+/// @return 0 when initialization is successful, 1 otherwise
+int load(LibraryHandle& /*handle*/) {
+
+    try {
+        instance.reset(new LeaseCmds());
+    } catch (const isc::Unexpected& ex) {
+        LOG_ERROR(lease_cmds_logger, LEASE_CMDS_INIT_FAILED)
+            .arg(ex.what());
+        return (1);
+    }
+
+    LOG_INFO(lease_cmds_logger, LEASE_CMDS_INIT_OK);
+    return (0);
+}
+
+/// @brief This function is called when the library is unloaded.
+///
+/// This function creates LeaseCmds object that deregisters