Adding upstream version 2.2.0.upstream/2.2.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 6951 insertions, 0 deletions

diff --git a/src/hooks/dhcp/run_script/Makefile.am b/src/hooks/dhcp/run_script/Makefile.am
new file mode 100644
index 0000000..310ac9b
--- /dev/null
+++ b/src/hooks/dhcp/run_script/Makefile.am
@@ -0,0 +1,87 @@
+SUBDIRS = . libloadtests tests
+
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Ensure that the message file and doxygen file is included in the distribution
+EXTRA_DIST = run_script_messages.mes
+EXTRA_DIST += run_script.dox
+
+CLEANFILES = *.gcno *.gcda
+
+# convenience archive
+
+noinst_LTLIBRARIES = librun_script.la
+
+librun_script_la_SOURCES  = run_script_callouts.cc
+librun_script_la_SOURCES += run_script.cc run_script.h
+librun_script_la_SOURCES += run_script_log.cc run_script_log.h
+librun_script_la_SOURCES += run_script_messages.cc run_script_messages.h
+librun_script_la_SOURCES += version.cc
+
+librun_script_la_CXXFLAGS = $(AM_CXXFLAGS)
+librun_script_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/kea/hooks
+lib_hooksdir = $(libdir)/kea/hooks
+lib_hooks_LTLIBRARIES = libdhcp_run_script.la
+
+libdhcp_run_script_la_SOURCES  =
+libdhcp_run_script_la_LDFLAGS  = $(AM_LDFLAGS)
+libdhcp_run_script_la_LDFLAGS  += -avoid-version -export-dynamic -module
+libdhcp_run_script_la_LIBADD  = librun_script.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/process/libkea-process.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/eval/libkea-eval.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/stats/libkea-stats.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/http/libkea-http.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/database/libkea-database.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libdhcp_run_script_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libdhcp_run_script_la_LIBADD += $(LOG4CPLUS_LIBS)
+libdhcp_run_script_la_LIBADD += $(CRYPTO_LIBS)
+libdhcp_run_script_la_LIBADD += $(BOOST_LIBS)
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f run_script_messages.h run_script_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: run_script_messages.h run_script_messages.cc
+	@echo Message files regenerated
+
+run_script_messages.h run_script_messages.cc: run_script_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/hooks/dhcp/run_script/run_script_messages.mes
+
+else
+
+messages run_script_messages.h run_script_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
+
diff --git a/src/hooks/dhcp/run_script/Makefile.in b/src/hooks/dhcp/run_script/Makefile.in
new file mode 100644
index 0000000..e078739
--- /dev/null
+++ b/src/hooks/dhcp/run_script/Makefile.in
@@ -0,0 +1,1040 @@
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+DISTCHECK_LOG4CPLUS_CONFIGURE_FLAG = @DISTCHECK_LOG4CPLUS_CONFIGURE_FLAG@
+DISTCHECK_PERFDHCP_CONFIGURE_FLAG = @DISTCHECK_PERFDHCP_CONFIGURE_FLAG@
+DISTCHECK_PREMIUM_CONFIGURE_FLAG = @DISTCHECK_PREMIUM_CONFIGURE_FLAG@
+DLLTOOL = @DLLTOOL@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
+ECHO_C = @ECHO_C@
+ECHO_N = @ECHO_N@
+ECHO_T = @ECHO_T@
+EGREP = @EGREP@
+EXEEXT = @EXEEXT@
+FGREP = @FGREP@
+GENHTML = @GENHTML@
+GREP = @GREP@
+GSSAPI_CFLAGS = @GSSAPI_CFLAGS@
+GSSAPI_LIBS = @GSSAPI_LIBS@
+GTEST_CONFIG = @GTEST_CONFIG@
+GTEST_INCLUDES = @GTEST_INCLUDES@
+GTEST_LDADD = @GTEST_LDADD@
+GTEST_LDFLAGS = @GTEST_LDFLAGS@
+GTEST_SOURCE = @GTEST_SOURCE@
+HAVE_SYSREPO = @HAVE_SYSREPO@
+INSTALL = @INSTALL@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+KEA_CXXFLAGS = @KEA_CXXFLAGS@
+KEA_SRCID = @KEA_SRCID@
+KRB5_CONFIG = @KRB5_CONFIG@
+LCOV = @LCOV@
+LD = @LD@
+LDFLAGS = @LDFLAGS@
+LEX = @LEX@
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+LEX_OUTPUT_ROOT = @LEX_OUTPUT_ROOT@
+LIBOBJS = @LIBOBJS@
+LIBS = @LIBS@
+LIBTOOL = @LIBTOOL@
+LIPO = @LIPO@
+LN_S = @LN_S@
+LOG4CPLUS_INCLUDES = @LOG4CPLUS_INCLUDES@
+LOG4CPLUS_LIBS = @LOG4CPLUS_LIBS@
+LTLIBOBJS = @LTLIBOBJS@
+LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
+MKDIR_P = @MKDIR_P@
+MYSQL_CPPFLAGS = @MYSQL_CPPFLAGS@
+MYSQL_LIBS = @MYSQL_LIBS@
+NM = @NM@
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+OBJDUMP = @OBJDUMP@
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+PACKAGE = @PACKAGE@
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+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
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+PACKAGE_VERSION_TYPE = @PACKAGE_VERSION_TYPE@
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+SRPD_PLUGINS_PATH = @SRPD_PLUGINS_PATH@
+SR_REPO_PATH = @SR_REPO_PATH@
+STRIP = @STRIP@
+SYSREPOCPP_VERSION = @SYSREPOCPP_VERSION@
+SYSREPO_CPPFLAGS = @SYSREPO_CPPFLAGS@
+SYSREPO_INCLUDEDIR = @SYSREPO_INCLUDEDIR@
+SYSREPO_LIBS = @SYSREPO_LIBS@
+SYSREPO_VERSION = @SYSREPO_VERSION@
+USE_LCOV = @USE_LCOV@
+VALGRIND = @VALGRIND@
+VERSION = @VERSION@
+WARNING_GCC_44_STRICT_ALIASING_CFLAG = @WARNING_GCC_44_STRICT_ALIASING_CFLAG@
+YACC = @YACC@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
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+build_vendor = @build_vendor@
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+docdir = @docdir@
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+host_cpu = @host_cpu@
+host_os = @host_os@
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+localstatedir = @localstatedir@
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+mkdir_p = @mkdir_p@
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+pkgpyexecdir = @pkgpyexecdir@
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+prefix = @prefix@
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+psdir = @psdir@
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+sysconfdir = @sysconfdir@
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+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+SUBDIRS = . libloadtests tests
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib \
+	$(BOOST_INCLUDES)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+# Ensure that the message file and doxygen file is included in the distribution
+EXTRA_DIST = run_script_messages.mes run_script.dox
+CLEANFILES = *.gcno *.gcda
+
+# convenience archive
+noinst_LTLIBRARIES = librun_script.la
+librun_script_la_SOURCES = run_script_callouts.cc run_script.cc \
+	run_script.h run_script_log.cc run_script_log.h \
+	run_script_messages.cc run_script_messages.h version.cc
+librun_script_la_CXXFLAGS = $(AM_CXXFLAGS)
+librun_script_la_CPPFLAGS = $(AM_CPPFLAGS)
+
+# install the shared object into $(libdir)/kea/hooks
+lib_hooksdir = $(libdir)/kea/hooks
+lib_hooks_LTLIBRARIES = libdhcp_run_script.la
+libdhcp_run_script_la_SOURCES = 
+libdhcp_run_script_la_LDFLAGS = $(AM_LDFLAGS) -avoid-version \
+	-export-dynamic -module
+libdhcp_run_script_la_LIBADD = librun_script.la \
+	$(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la \
+	$(top_builddir)/src/lib/process/libkea-process.la \
+	$(top_builddir)/src/lib/eval/libkea-eval.la \
+	$(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la \
+	$(top_builddir)/src/lib/stats/libkea-stats.la \
+	$(top_builddir)/src/lib/config/libkea-cfgclient.la \
+	$(top_builddir)/src/lib/http/libkea-http.la \
+	$(top_builddir)/src/lib/dhcp/libkea-dhcp++.la \
+	$(top_builddir)/src/lib/hooks/libkea-hooks.la \
+	$(top_builddir)/src/lib/database/libkea-database.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/dns/libkea-dns++.la \
+	$(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la \
+	$(LOG4CPLUS_LIBS) $(CRYPTO_LIBS) $(BOOST_LIBS)
+all: all-recursive
+
+.SUFFIXES:
+.SUFFIXES: .cc .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/hooks/dhcp/run_script/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/hooks/dhcp/run_script/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+install-lib_hooksLTLIBRARIES: $(lib_hooks_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(lib_hooks_LTLIBRARIES)'; test -n "$(lib_hooksdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(lib_hooksdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(lib_hooksdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(lib_hooksdir)"; \
+	}
+
+uninstall-lib_hooksLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(lib_hooks_LTLIBRARIES)'; test -n "$(lib_hooksdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(lib_hooksdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(lib_hooksdir)/$$f"; \
+	done
+
+clean-lib_hooksLTLIBRARIES:
+	-test -z "$(lib_hooks_LTLIBRARIES)" || rm -f $(lib_hooks_LTLIBRARIES)
+	@list='$(lib_hooks_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libdhcp_run_script.la: $(libdhcp_run_script_la_OBJECTS) $(libdhcp_run_script_la_DEPENDENCIES) $(EXTRA_libdhcp_run_script_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libdhcp_run_script_la_LINK) -rpath $(lib_hooksdir) $(libdhcp_run_script_la_OBJECTS) $(libdhcp_run_script_la_LIBADD) $(LIBS)
+
+librun_script.la: $(librun_script_la_OBJECTS) $(librun_script_la_DEPENDENCIES) $(EXTRA_librun_script_la_DEPENDENCIES) 
+	$(AM_V_CXXLD)$(librun_script_la_LINK)  $(librun_script_la_OBJECTS) $(librun_script_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/librun_script_la-run_script.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/librun_script_la-run_script_callouts.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/librun_script_la-run_script_log.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/librun_script_la-run_script_messages.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/librun_script_la-version.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.cc.o:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ $<
+
+.cc.obj:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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+.cc.lo:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LTCXXCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(LTCXXCOMPILE) -c -o $@ $<
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+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/librun_script_la-run_script_callouts.Tpo $(DEPDIR)/librun_script_la-run_script_callouts.Plo
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+
+librun_script_la-run_script.lo: run_script.cc
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(librun_script_la_CPPFLAGS) $(CPPFLAGS) $(librun_script_la_CXXFLAGS) $(CXXFLAGS) -MT librun_script_la-run_script.lo -MD -MP -MF $(DEPDIR)/librun_script_la-run_script.Tpo -c -o librun_script_la-run_script.lo `test -f 'run_script.cc' || echo '$(srcdir)/'`run_script.cc
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/librun_script_la-run_script.Tpo $(DEPDIR)/librun_script_la-run_script.Plo
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='run_script.cc' object='librun_script_la-run_script.lo' libtool=yes @AMDEPBACKSLASH@
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+
+librun_script_la-run_script_log.lo: run_script_log.cc
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(librun_script_la_CPPFLAGS) $(CPPFLAGS) $(librun_script_la_CXXFLAGS) $(CXXFLAGS) -MT librun_script_la-run_script_log.lo -MD -MP -MF $(DEPDIR)/librun_script_la-run_script_log.Tpo -c -o librun_script_la-run_script_log.lo `test -f 'run_script_log.cc' || echo '$(srcdir)/'`run_script_log.cc
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+
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+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/librun_script_la-run_script_messages.Tpo $(DEPDIR)/librun_script_la-run_script_messages.Plo
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diff --git a/src/hooks/dhcp/run_script/libloadtests/Makefile.am b/src/hooks/dhcp/run_script/libloadtests/Makefile.am
new file mode 100644
index 0000000..439045a
--- /dev/null
+++ b/src/hooks/dhcp/run_script/libloadtests/Makefile.am
@@ -0,0 +1,60 @@
+SUBDIRS = .
+
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+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += -DLIBRUN_SCRIPT_SO=\"$(abs_top_builddir)/src/hooks/dhcp/run_script/.libs/libdhcp_run_script.so\"
+AM_CPPFLAGS += -DRUN_SCRIPT_TEST_SH=\"$(abs_top_builddir)/src/hooks/dhcp/run_script/tests/run_script_test.sh\"
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diff --git a/src/hooks/dhcp/run_script/libloadtests/Makefile.in b/src/hooks/dhcp/run_script/libloadtests/Makefile.in
new file mode 100644
index 0000000..5897e99
--- /dev/null
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+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/run_script_unittests-load_unload_unittests.Po
+	-rm -f ./$(DEPDIR)/run_script_unittests-run_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/run_script/libloadtests/load_unload_unittests.cc b/src/hooks/dhcp/run_script/libloadtests/load_unload_unittests.cc
new file mode 100644
index 0000000..b924b8d
--- /dev/null
+++ b/src/hooks/dhcp/run_script/libloadtests/load_unload_unittests.cc
@@ -0,0 +1,120 @@
+// Copyright (C) 2019-2021 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 This file contains tests which exercise the load and unload
+/// functions in the flexible option hook library. In order to test the load
+/// function, one must be able to pass it hook library parameters. The
+/// the only way to populate these parameters is by actually loading the
+/// library via HooksManager::loadLibraries().
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <hooks/hooks_manager.h>
+
+#include <gtest/gtest.h>
+#include <errno.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::hooks;
+using namespace isc::data;
+
+namespace {
+
+/// @brief Test fixture for testing loading and unloading the RunScript library.
+class LibLoadTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    LibLoadTest() {
+        reset();
+    }
+
+    /// @brief Destructor
+    ///
+    /// Removes files that may be left over from previous tests
+    virtual ~LibLoadTest() {
+        reset();
+    }
+
+    /// @brief Removes files that may be left over from previous tests
+    virtual void reset() {
+        HooksManager::unloadLibraries();
+    }
+
+    /// @brief Add library to the collection of tested libraries.
+    ///
+    /// @param lib The name of the lib added.
+    /// @param params The parameters of the library.
+    void addLib(const string& lib, ConstElementPtr params) {
+        libraries_.push_back(make_pair(lib, params));
+    }
+
+    /// @brief Load libraries.
+    ///
+    /// @return True if loading succeeded, false otherwise.
+    bool loadLibs() {
+        return (HooksManager::loadLibraries(libraries_));
+    }
+
+    /// @brief Unload libraries.
+    ///
+    /// @return True if unloading succeeded, false otherwise.
+    bool unloadLibs() {
+        return (HooksManager::unloadLibraries());
+    }
+
+    /// @brief The collection of libraries to be loaded.
+    HookLibsCollection libraries_;
+};
+
+// Simple test that checks the library can be loaded and unloaded several times.
+TEST_F(LibLoadTest, validLoad) {
+    // Prepare parameters for the callout parameters library.
+    ElementPtr params = Element::createMap();
+    ElementPtr name = Element::create(RUN_SCRIPT_TEST_SH);
+    params->set("name", name);
+    ElementPtr sync = Element::create(false);
+    params->set("sync", sync);
+
+    addLib(LIBRUN_SCRIPT_SO, params);
+
+    EXPECT_TRUE(loadLibs());
+    EXPECT_NO_THROW(unloadLibs());
+
+    EXPECT_TRUE(loadLibs());
+    EXPECT_NO_THROW(unloadLibs());
+}
+
+// Simple test that checks the library can not be loaded if using wrong
+// parameters.
+TEST_F(LibLoadTest, invalidLoad) {
+    // Prepare parameters for the callout parameters library.
+    ElementPtr params = Element::createMap();
+    addLib(LIBRUN_SCRIPT_SO, params);
+
+    // The name parameter is mandatory.
+    EXPECT_FALSE(loadLibs());
+
+    // Use invalid name parameter type.
+    ElementPtr name = Element::create(false);
+    params->set("name", name);
+    EXPECT_FALSE(loadLibs());
+
+    // Use invalid name parameter.
+    name = Element::create("script_name.sh");
+    params->set("name", name);
+    EXPECT_FALSE(loadLibs());
+
+    // Use valid name parameter type but use invalid sync parameter type.
+    name = Element::create(RUN_SCRIPT_TEST_SH);
+    params->set("name", name);
+    ElementPtr sync = Element::create("data");
+    params->set("sync", sync);
+    EXPECT_FALSE(loadLibs());
+}
+
+} // end of anonymous namespace
diff --git a/src/hooks/dhcp/run_script/libloadtests/run_unittests.cc b/src/hooks/dhcp/run_script/libloadtests/run_unittests.cc
new file mode 100644
index 0000000..1b4d40c
--- /dev/null
+++ b/src/hooks/dhcp/run_script/libloadtests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 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 <log/logger_support.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/run_script/run_script.cc b/src/hooks/dhcp/run_script/run_script.cc
new file mode 100644
index 0000000..ab710f1
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script.cc
@@ -0,0 +1,457 @@
+// Copyright (C) 2021 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 <run_script.h>
+
+using namespace isc::asiolink;
+using namespace isc::data;
+using namespace isc::hooks;
+using namespace isc::util;
+using namespace isc::dhcp;
+using namespace std;
+
+namespace isc {
+namespace run_script {
+
+IOServicePtr RunScriptImpl::io_service_;
+
+RunScriptImpl::RunScriptImpl() : name_(), sync_(false) {
+}
+
+void
+RunScriptImpl::configure(LibraryHandle& handle) {
+    ConstElementPtr name = handle.getParameter("name");
+    if (!name) {
+        isc_throw(NotFound, "The 'name' parameter is mandatory");
+    }
+    if (name->getType() != Element::string) {
+        isc_throw(InvalidParameter, "The 'name' parameter must be a string");
+    }
+    try {
+        ProcessSpawn process(IOServicePtr(), name->stringValue());
+    } catch (const isc::Exception& ex) {
+        isc_throw(InvalidParameter, "Invalid 'name' parameter: " << ex.what());
+    }
+    setName(name->stringValue());
+    ConstElementPtr sync = handle.getParameter("sync");
+    if (sync) {
+        if (sync->getType() != Element::boolean) {
+            isc_throw(InvalidParameter, "The 'sync' parameter must be a boolean");
+        }
+        setSync(sync->boolValue());
+    }
+}
+
+void
+RunScriptImpl::runScript(const ProcessArgs& args, const ProcessEnvVars& vars) {
+    ProcessSpawn process(getIOService(), name_, args, vars);
+    process.spawn(true);
+}
+
+void
+RunScriptImpl::extractBoolean(ProcessEnvVars& vars,
+                              const bool value,
+                              const string& prefix,
+                              const string& suffix) {
+    string data;
+    if (value) {
+        data = "true";
+    } else {
+        data = "false";
+    }
+    string exported_data = prefix + suffix + "=" + data;
+    vars.push_back(exported_data);
+}
+
+void
+RunScriptImpl::extractInteger(ProcessEnvVars& vars,
+                              const uint64_t value,
+                              const string& prefix,
+                              const string& suffix) {
+    string exported_data = prefix + suffix + "=" + boost::lexical_cast<string>(value);
+    vars.push_back(exported_data);
+}
+
+void
+RunScriptImpl::extractString(ProcessEnvVars& vars,
+                             const string& value,
+                             const string& prefix,
+                             const string& suffix) {
+    string exported_data = prefix + suffix + "=" + value;
+    vars.push_back(exported_data);
+}
+
+void
+RunScriptImpl::extractHWAddr(ProcessEnvVars& vars,
+                             const HWAddrPtr& hwaddr,
+                             const string& prefix,
+                             const string& suffix) {
+    if (hwaddr) {
+        RunScriptImpl::extractString(vars, hwaddr->toText(false), prefix, suffix);
+        RunScriptImpl::extractInteger(vars, hwaddr->htype_, prefix + "_TYPE", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix, suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_TYPE", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractDUID(ProcessEnvVars& vars,
+                           const DuidPtr duid,
+                           const string& prefix,
+                           const string& suffix) {
+    if (duid) {
+        RunScriptImpl::extractString(vars, duid->toText(),
+                                     prefix, suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix, suffix);
+    }
+}
+
+void
+RunScriptImpl::extractOption(ProcessEnvVars& vars,
+                             const OptionPtr option,
+                             const string& prefix,
+                             const string& suffix) {
+    if (option) {
+        RunScriptImpl::extractString(vars, option->toHexString(),
+                                     prefix + "_OPTION_" +
+                                     boost::lexical_cast<string>(option->getType()),
+                                     suffix);
+    }
+}
+
+void
+RunScriptImpl::extractSubOption(ProcessEnvVars& vars,
+                                const OptionPtr option,
+                                uint16_t code,
+                                const string& prefix,
+                                const string& suffix) {
+    if (option) {
+        RunScriptImpl::extractOption(vars, option->getOption(code),
+                                     prefix + "_OPTION_" +
+                                     boost::lexical_cast<string>(option->getType()) +
+                                     "_SUB", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractOptionIA(ProcessEnvVars& vars,
+                               const Option6IAPtr option6IA,
+                               const string& prefix,
+                               const string& suffix) {
+    if (option6IA) {
+        RunScriptImpl::extractInteger(vars, option6IA->getIAID(),
+                                      prefix + "_IAID", suffix);
+        RunScriptImpl::extractInteger(vars, option6IA->getType(),
+                                      prefix + "_IA_TYPE", suffix);
+        RunScriptImpl::extractInteger(vars, option6IA->getT1(),
+                                      prefix + "_IA_T1", suffix);
+        RunScriptImpl::extractInteger(vars, option6IA->getT2(),
+                                      prefix + "_IA_T2", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_IAID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IA_TYPE", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IA_T1", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IA_T2", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractSubnet4(ProcessEnvVars& vars,
+                              const Subnet4Ptr subnet4,
+                              const string& prefix,
+                              const string& suffix) {
+    if (subnet4) {
+        RunScriptImpl::extractInteger(vars, subnet4->getID(),
+                                      prefix + "_ID", suffix);
+        RunScriptImpl::extractString(vars, subnet4->toText(),
+                                     prefix + "_NAME", suffix);
+        auto prefix_data = subnet4->get();
+        RunScriptImpl::extractString(vars, prefix_data.first.toText(),
+                                     prefix + "_PREFIX", suffix);
+        RunScriptImpl::extractInteger(vars, prefix_data.second,
+                                      prefix + "_PREFIX_LEN", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_ID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_NAME", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFIX", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFIX_LEN", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractSubnet6(ProcessEnvVars& vars,
+                              const Subnet6Ptr subnet6,
+                              const string& prefix,
+                              const string& suffix) {
+    if (subnet6) {
+        RunScriptImpl::extractInteger(vars, subnet6->getID(),
+                                      prefix + "_ID", suffix);
+        RunScriptImpl::extractString(vars, subnet6->toText(),
+                                     prefix + "_NAME", suffix);
+        auto prefix_data = subnet6->get();
+        RunScriptImpl::extractString(vars, prefix_data.first.toText(),
+                                     prefix + "_PREFIX", suffix);
+        RunScriptImpl::extractInteger(vars, prefix_data.second,
+                                      prefix + "_PREFIX_LEN", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_ID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_NAME", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFIX", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFIX_LEN", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractLease4(ProcessEnvVars& vars,
+                             const Lease4Ptr& lease4,
+                             const string& prefix,
+                             const string& suffix) {
+    if (lease4) {
+        RunScriptImpl::extractString(vars, lease4->addr_.toText(),
+                                     prefix + "_ADDRESS", suffix);
+        RunScriptImpl::extractInteger(vars, static_cast<uint64_t>(lease4->cltt_),
+                                      prefix + "_CLTT", suffix);
+        RunScriptImpl::extractString(vars, lease4->hostname_,
+                                     prefix + "_HOSTNAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, lease4->hwaddr_,
+                                     prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractString(vars, Lease4::statesToText(lease4->state_),
+                                     prefix + "_STATE", suffix);
+        RunScriptImpl::extractInteger(vars, lease4->subnet_id_,
+                                      prefix + "_SUBNET_ID", suffix);
+        RunScriptImpl::extractInteger(vars, lease4->valid_lft_,
+                                      prefix + "_VALID_LIFETIME", suffix);
+        RunScriptImpl::extractDUID(vars, lease4->client_id_,
+                                   prefix + "_CLIENT_ID", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_ADDRESS", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_CLTT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_HOSTNAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(), prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_STATE", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_SUBNET_ID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_VALID_LIFETIME", suffix);
+        RunScriptImpl::extractDUID(vars, DuidPtr(), prefix + "_CLIENT_ID", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractLease6(ProcessEnvVars& vars,
+                             const Lease6Ptr& lease6,
+                             const string& prefix,
+                             const string& suffix) {
+    if (lease6) {
+        RunScriptImpl::extractString(vars, lease6->addr_.toText(),
+                                     prefix + "_ADDRESS", suffix);
+        RunScriptImpl::extractInteger(vars, static_cast<uint64_t>(lease6->cltt_),
+                                      prefix + "_CLTT", suffix);
+        RunScriptImpl::extractString(vars, lease6->hostname_,
+                                     prefix + "_HOSTNAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, lease6->hwaddr_,
+                                     prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractString(vars, Lease6::statesToText(lease6->state_),
+                                     prefix + "_STATE", suffix);
+        RunScriptImpl::extractInteger(vars, lease6->subnet_id_,
+                                      prefix + "_SUBNET_ID", suffix);
+        RunScriptImpl::extractInteger(vars, lease6->valid_lft_,
+                                      prefix + "_VALID_LIFETIME", suffix);
+        RunScriptImpl::extractDUID(vars, lease6->duid_,
+                                   prefix + "_DUID", suffix);
+        RunScriptImpl::extractInteger(vars, lease6->iaid_,
+                                      prefix + "_IAID", suffix);
+        RunScriptImpl::extractInteger(vars, lease6->preferred_lft_,
+                                      prefix + "_PREFERRED_LIFETIME", suffix);
+        RunScriptImpl::extractInteger(vars, lease6->prefixlen_,
+                                      prefix + "_PREFIX_LEN", suffix);
+        RunScriptImpl::extractString(vars, Lease::typeToText(lease6->type_),
+                                     prefix + "_TYPE", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_ADDRESS", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_CLTT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_HOSTNAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(), prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_STATE", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_SUBNET_ID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_VALID_LIFETIME", suffix);
+        RunScriptImpl::extractDUID(vars, DuidPtr(), prefix + "_DUID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IAID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFERRED_LIFETIME", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PREFIX_LEN", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_TYPE", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractLeases4(ProcessEnvVars& vars,
+                              const Lease4CollectionPtr& leases4,
+                              const string& prefix,
+                              const string& suffix) {
+    if (leases4) {
+        RunScriptImpl::extractInteger(vars, leases4->size(),
+                                      prefix + "_SIZE", suffix);
+        for (size_t i = 0; i < leases4->size(); ++i) {
+            RunScriptImpl::extractLease4(vars, leases4->at(i),
+                                         prefix + "_AT" +
+                                         boost::lexical_cast<string>(i),
+                                         suffix);
+        }
+    } else {
+        RunScriptImpl::extractString(vars, "0", prefix + "_SIZE", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractLeases6(ProcessEnvVars& vars,
+                              const Lease6CollectionPtr& leases6,
+                              const string& prefix,
+                              const string& suffix) {
+    if (leases6) {
+        RunScriptImpl::extractInteger(vars, leases6->size(),
+                                      prefix + "_SIZE", suffix);
+        for (size_t i = 0; i < leases6->size(); ++i) {
+            RunScriptImpl::extractLease6(vars, leases6->at(i),
+                                         prefix + "_AT" +
+                                         boost::lexical_cast<string>(i),
+                                         suffix);
+        }
+    } else {
+        RunScriptImpl::extractString(vars, "0", prefix + "_SIZE", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractPkt4(ProcessEnvVars& vars,
+                           const Pkt4Ptr& pkt4,
+                           const string& prefix,
+                           const string& suffix) {
+    if (pkt4) {
+        RunScriptImpl::extractString(vars, pkt4->getName(pkt4->getType()),
+                                     prefix + "_TYPE", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getTransid(),
+                                      prefix + "_TXID", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getLocalAddr().toText(),
+                                     prefix + "_LOCAL_ADDR", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getLocalPort(),
+                                      prefix + "_LOCAL_PORT", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getRemoteAddr().toText(),
+                                     prefix + "_REMOTE_ADDR", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getRemotePort(),
+                                      prefix + "_REMOTE_PORT", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getIndex(),
+                                      prefix + "_IFACE_INDEX", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getIface(),
+                                     prefix + "_IFACE_NAME", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getHops(),
+                                      prefix + "_HOPS", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getSecs(),
+                                      prefix + "_SECS", suffix);
+        RunScriptImpl::extractInteger(vars, pkt4->getFlags(),
+                                      prefix + "_FLAGS", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getCiaddr().toText(),
+                                     prefix + "_CIADDR", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getSiaddr().toText(),
+                                     prefix + "_SIADDR", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getYiaddr().toText(),
+                                     prefix + "_YIADDR", suffix);
+        RunScriptImpl::extractString(vars, pkt4->getGiaddr().toText(),
+                                     prefix + "_GIADDR", suffix);
+        RunScriptImpl::extractBoolean(vars, pkt4->isRelayed(),
+                                      prefix + "_RELAYED", suffix);
+        RunScriptImpl::extractHWAddr(vars, pkt4->getHWAddr(),
+                                     prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractHWAddr(vars, pkt4->getLocalHWAddr(),
+                                     prefix + "_LOCAL_HWADDR", suffix);
+        RunScriptImpl::extractHWAddr(vars, pkt4->getRemoteHWAddr(),
+                                     prefix + "_REMOTE_HWADDR", suffix);
+        RunScriptImpl::extractOption(vars,
+                                     pkt4->getOption(DHO_DHCP_AGENT_OPTIONS),
+                                     prefix, suffix);
+        RunScriptImpl::extractSubOption(vars,
+                                        pkt4->getOption(DHO_DHCP_AGENT_OPTIONS),
+                                        RAI_OPTION_AGENT_CIRCUIT_ID,
+                                        prefix, suffix);
+        RunScriptImpl::extractSubOption(vars,
+                                        pkt4->getOption(DHO_DHCP_AGENT_OPTIONS),
+                                        RAI_OPTION_REMOTE_ID,
+                                        prefix, suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_TYPE", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_TXID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_LOCAL_ADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_LOCAL_PORT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_REMOTE_ADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_REMOTE_PORT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IFACE_INDEX", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IFACE_NAME", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_HOPS", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_SECS", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_FLAGS", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_CIADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_SIADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_YIADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_GIADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_RELAYED", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(),
+                                     prefix + "_HWADDR", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(),
+                                     prefix + "_LOCAL_HWADDR", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(),
+                                     prefix + "_REMOTE_HWADDR", suffix);
+    }
+}
+
+void
+RunScriptImpl::extractPkt6(ProcessEnvVars& vars,
+                           const Pkt6Ptr& pkt6,
+                           const string& prefix,
+                           const string& suffix) {
+    if (pkt6) {
+        RunScriptImpl::extractString(vars, pkt6->getName(pkt6->getType()),
+                                     prefix + "_TYPE", suffix);
+        RunScriptImpl::extractInteger(vars, pkt6->getTransid(),
+                                      prefix + "_TXID", suffix);
+        RunScriptImpl::extractString(vars, pkt6->getLocalAddr().toText(),
+                                     prefix + "_LOCAL_ADDR", suffix);
+        RunScriptImpl::extractInteger(vars, pkt6->getLocalPort(),
+                                      prefix + "_LOCAL_PORT", suffix);
+        RunScriptImpl::extractString(vars, pkt6->getRemoteAddr().toText(),
+                                     prefix + "_REMOTE_ADDR", suffix);
+        RunScriptImpl::extractInteger(vars, pkt6->getRemotePort(),
+                                      prefix + "_REMOTE_PORT", suffix);
+        RunScriptImpl::extractInteger(vars, pkt6->getIndex(),
+                                      prefix + "_IFACE_INDEX", suffix);
+        RunScriptImpl::extractString(vars, pkt6->getIface(),
+                                     prefix + "_IFACE_NAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, pkt6->getRemoteHWAddr(),
+                                     prefix + "_REMOTE_HWADDR", suffix);
+        string proto_data = (pkt6->getProto() == Pkt6::UDP ? "UDP" : "TCP");
+        RunScriptImpl::extractString(vars, proto_data,
+                                     prefix + "_PROTO", suffix);
+        RunScriptImpl::extractDUID(vars, pkt6->getClientId(),
+                                   prefix + "_CLIENT_ID", suffix);
+    } else {
+        RunScriptImpl::extractString(vars, "", prefix + "_TYPE", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_TXID", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_LOCAL_ADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_LOCAL_PORT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_REMOTE_ADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_REMOTE_PORT", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IFACE_INDEX", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_IFACE_NAME", suffix);
+        RunScriptImpl::extractHWAddr(vars, HWAddrPtr(),
+                                     prefix + "_REMOTE_HWADDR", suffix);
+        RunScriptImpl::extractString(vars, "", prefix + "_PROTO", suffix);
+        RunScriptImpl::extractDUID(vars, DuidPtr(),
+                                   prefix + "_CLIENT_ID", suffix);
+    }
+}
+
+} // namespace run_script
+} // namespace isc
diff --git a/src/hooks/dhcp/run_script/run_script.dox b/src/hooks/dhcp/run_script/run_script.dox
new file mode 100644
index 0000000..3fbcd12
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script.dox
@@ -0,0 +1,673 @@
+// Copyright (C) 2021 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/.
+
+/**
+
+@page libdhcp_run_script Kea Run Script Hooks Library
+
+@section libdhcp_run_scriptIntro Introduction
+
+Welcome to Kea Run Script Hooks Library. This documentation is addressed to
+developers who are interested in the internal operation of the Run Script
+library. This file provides information needed to understand and
+perhaps extend this library.
+
+This documentation is stand-alone: you should have read and understood
+the <a href="https://reports.kea.isc.org/dev_guide/">Kea
+Developer's Guide</a> and in particular its section about hooks.
+
+@section libdhcp_run_scriptUser Now To Use libdhcp_run_script
+## Introduction
+libdhcp_run_script is a hooks library which allows an external script to
+be run on specific hook points.
+
+## Configuring the DHCPv4 and DHCPv6 Modules
+
+It must be configured as a hook library for the desired DHCP server
+modules. Note that the Run Script library is installed alongside the
+Kea libraries in "<install-dir>/lib" where <install-dir> is determined
+by the --prefix option of the configure script.  It defaults to
+"/usr/local".
+
+Configuring kea-dhcp4 to load the Run Script library could be done with
+the following Kea4 configuration:
+
+@code
+"Dhcp4": {
+    "hooks-libraries": [
+        {   "library": "/usr/local/lib/libdhcp_run_script.so",
+            "parameters": {
+                "name": "/full_path_to/script_name.sh",
+                "sync": false
+            }
+        },
+        ...
+    ]
+}
+@endcode
+
+Configuring kea-dhcp6 to load the Run Script library could be done with
+the following Kea6 configuration:
+
+@code
+"Dhcp6": {
+    "hooks-libraries": [
+        {   "library": "/usr/local/lib/libdhcp_run_script.so",
+            "parameters": {
+                "name": "/full_path_to/script_name.sh",
+                "sync": false
+            }
+        },
+        ...
+    ]
+}
+@endcode
+
+The parameters contain the 'name' which indicates the full path to the external
+script to be called on each hookpoint, and also the 'sync' option to be able
+to wait synchronously for the script to finish execution.
+If the 'sync' parameter is false, then the script will be launched and Kea
+will not wait for the execution to finish, causing all the OUT parameters of
+the script (including next step) to be ignored.
+
+The script inherits all privileges from the server which calls it.
+
+Currently the functionality underneath 'sync' parameter is not implemented
+and enabling synchronous calls to external script is not supported.
+
+## Internal operation
+
+The first function called in @ref load() located in the
+run_script_callouts.cc. It checks if the necessary parameter is passed and
+decodes the option configurations. @ref unload() free the configuration.
+
+Kea engine checks if the library has functions that match known hook
+point names. This library has several such functions: @ref lease4_renew,
+@ref lease4_expire, @ref lease4_recover, @ref leases4_committed,
+@ref lease4_release, @ref lease4_decline, @ref lease6_renew,
+@ref lease6_rebind, @ref lease6_expire, @ref lease6_recover,
+@ref leases6_committed, @ref lease6_release, @ref lease6_decline located
+in run_script_callouts.cc.
+
+Each hook point extracts the Kea internal data and exports it as string
+environment variables. These parameters are shared with the target script
+using the child process environment.
+The only parameter passed to the call of the target script is the name of
+the hook point.
+
+An example of a script implementing all hook points is presented below.
+
+@code
+#!/bin/bash
+
+unknown_handle() {
+    echo "Unhandled function call ${*}"
+    exit 123
+}
+
+lease4_renew () {
+    ...
+}
+
+lease4_expire () {
+    ...
+}
+
+lease4_recover () {
+    ...
+}
+
+leases4_committed () {
+    ...
+}
+
+lease4_release () {
+    ...
+}
+
+lease4_decline () {
+    ...
+}
+
+lease6_renew () {
+    ...
+}
+
+lease6_rebind () {
+    ...
+}
+
+lease6_expire () {
+    ...
+}
+
+lease6_recover () {
+    ...
+}
+
+leases6_committed () {
+    ...
+}
+
+lease6_release () {
+    ...
+}
+
+lease6_decline () {
+    ...
+}
+
+case "$1" in
+    "lease4_renew")
+        lease4_renew
+        ;;
+    "lease4_expire")
+        lease4_expire
+        ;;
+    "lease4_recover")
+        lease4_recover
+        ;;
+    "leases4_committed")
+        leases4_committed
+        ;;
+    "lease4_release")
+        lease4_release
+        ;;
+    "lease4_decline")
+        lease4_decline
+        ;;
+    "lease6_renew")
+        lease6_renew
+        ;;
+    "lease6_rebind")
+        lease6_rebind
+        ;;
+    "lease6_expire")
+        lease6_expire
+        ;;
+    "lease6_recover")
+        lease6_recover
+        ;;
+    "leases6_committed")
+        leases6_committed
+        ;;
+    "lease6_release")
+        lease6_release
+        ;;
+    "lease6_decline")
+        lease6_decline
+        ;;
+    *)
+        unknown_handle "${@}"
+        ;;
+esac
+
+@endcode
+
+Available parameters for each hook points are presented below.
+
+lease4_renew
+
+@code
+
+QUERY4_TYPE
+QUERY4_TXID
+QUERY4_LOCAL_ADDR
+QUERY4_LOCAL_PORT
+QUERY4_REMOTE_ADDR
+QUERY4_REMOTE_PORT
+QUERY4_IFACE_INDEX
+QUERY4_IFACE_NAME
+QUERY4_HOPS
+QUERY4_SECS
+QUERY4_FLAGS
+QUERY4_CIADDR
+QUERY4_SIADDR
+QUERY4_YIADDR
+QUERY4_GIADDR
+QUERY4_RELAYED
+QUERY4_HWADDR
+QUERY4_HWADDR_TYPE
+QUERY4_LOCAL_HWADDR
+QUERY4_LOCAL_HWADDR_TYPE
+QUERY4_REMOTE_HWADDR
+QUERY4_REMOTE_HWADDR_TYPE
+QUERY4_OPTION_82
+QUERY4_OPTION_82_SUB_OPTION_1
+QUERY4_OPTION_82_SUB_OPTION_2
+SUBNET4_ID
+SUBNET4_NAME
+SUBNET4_PREFIX
+SUBNET4_PREFIX_LEN
+PKT4_CLIENT_ID
+PKT4_HWADDR
+PKT4_HWADDR_TYPE
+LEASE4_ADDRESS
+LEASE4_CLTT
+LEASE4_HOSTNAME
+LEASE4_HWADDR
+LEASE4_HWADDR_TYPE
+LEASE4_STATE
+LEASE4_SUBNET_ID
+LEASE4_VALID_LIFETIME
+LEASE4_CLIENT_ID
+
+@endcode
+
+lease4_expire
+
+@code
+
+LEASE4_ADDRESS
+LEASE4_CLTT
+LEASE4_HOSTNAME
+LEASE4_HWADDR
+LEASE4_HWADDR_TYPE
+LEASE4_STATE
+LEASE4_SUBNET_ID
+LEASE4_VALID_LIFETIME
+LEASE4_CLIENT_ID
+REMOVE_LEASE
+
+@endcode
+
+lease4_recover
+
+@code
+
+LEASE4_ADDRESS
+LEASE4_CLTT
+LEASE4_HOSTNAME
+LEASE4_HWADDR
+LEASE4_HWADDR_TYPE
+LEASE4_STATE
+LEASE4_SUBNET_ID
+LEASE4_VALID_LIFETIME
+LEASE4_CLIENT_ID
+
+@endcode
+
+leases4_committed
+
+@code
+
+QUERY4_TYPE
+QUERY4_TXID
+QUERY4_LOCAL_ADDR
+QUERY4_LOCAL_PORT
+QUERY4_REMOTE_ADDR
+QUERY4_REMOTE_PORT
+QUERY4_IFACE_INDEX
+QUERY4_IFACE_NAME
+QUERY4_HOPS
+QUERY4_SECS
+QUERY4_FLAGS
+QUERY4_CIADDR
+QUERY4_SIADDR
+QUERY4_YIADDR
+QUERY4_GIADDR
+QUERY4_RELAYED
+QUERY4_HWADDR
+QUERY4_HWADDR_TYPE
+QUERY4_LOCAL_HWADDR
+QUERY4_LOCAL_HWADDR_TYPE
+QUERY4_REMOTE_HWADDR
+QUERY4_REMOTE_HWADDR_TYPE
+QUERY4_OPTION_82
+QUERY4_OPTION_82_SUB_OPTION_1
+QUERY4_OPTION_82_SUB_OPTION_2
+LEASES4_SIZE
+DELETED_LEASES4_SIZE
+
+@endcode
+
+If LEASES4_SIZE or DELETED_LEASES4_SIZE are non zero, then each lease
+will have it's own unique identifier as shown below. First index starts
+at 0.
+
+@code
+
+LEASES4_AT0_ADDRESS
+LEASES4_AT0_CLTT
+LEASES4_AT0_HOSTNAME
+LEASES4_AT0_HWADDR
+LEASES4_AT0_HWADDR_TYPE
+LEASES4_AT0_STATE
+LEASES4_AT0_SUBNET_ID
+LEASES4_AT0_VALID_LIFETIME
+LEASES4_AT0_CLIENT_ID
+DELETED_LEASES4_AT0_ADDRESS
+DELETED_LEASES4_AT0_CLTT
+DELETED_LEASES4_AT0_HOSTNAME
+DELETED_LEASES4_AT0_HWADDR
+DELETED_LEASES4_AT0_HWADDR_TYPE
+DELETED_LEASES4_AT0_STATE
+DELETED_LEASES4_AT0_SUBNET_ID
+DELETED_LEASES4_AT0_VALID_LIFETIME
+DELETED_LEASES4_AT0_CLIENT_ID
+
+@endcode
+
+lease4_release
+
+@code
+
+QUERY4_TYPE
+QUERY4_TXID
+QUERY4_LOCAL_ADDR
+QUERY4_LOCAL_PORT
+QUERY4_REMOTE_ADDR
+QUERY4_REMOTE_PORT
+QUERY4_IFACE_INDEX
+QUERY4_IFACE_NAME
+QUERY4_HOPS
+QUERY4_SECS
+QUERY4_FLAGS
+QUERY4_CIADDR
+QUERY4_SIADDR
+QUERY4_YIADDR
+QUERY4_GIADDR
+QUERY4_RELAYED
+QUERY4_HWADDR
+QUERY4_HWADDR_TYPE
+QUERY4_LOCAL_HWADDR
+QUERY4_LOCAL_HWADDR_TYPE
+QUERY4_REMOTE_HWADDR
+QUERY4_REMOTE_HWADDR_TYPE
+QUERY4_OPTION_82
+QUERY4_OPTION_82_SUB_OPTION_1
+QUERY4_OPTION_82_SUB_OPTION_2
+LEASE4_ADDRESS
+LEASE4_CLTT
+LEASE4_HOSTNAME
+LEASE4_HWADDR
+LEASE4_HWADDR_TYPE
+LEASE4_STATE
+LEASE4_SUBNET_ID
+LEASE4_VALID_LIFETIME
+LEASE4_CLIENT_ID
+
+@endcode
+
+lease4_decline
+
+@code
+
+QUERY4_TYPE
+QUERY4_TXID
+QUERY4_LOCAL_ADDR
+QUERY4_LOCAL_PORT
+QUERY4_REMOTE_ADDR
+QUERY4_REMOTE_PORT
+QUERY4_IFACE_INDEX
+QUERY4_IFACE_NAME
+QUERY4_HOPS
+QUERY4_SECS
+QUERY4_FLAGS
+QUERY4_CIADDR
+QUERY4_SIADDR
+QUERY4_YIADDR
+QUERY4_GIADDR
+QUERY4_RELAYED
+QUERY4_HWADDR
+QUERY4_HWADDR_TYPE
+QUERY4_LOCAL_HWADDR
+QUERY4_LOCAL_HWADDR_TYPE
+QUERY4_REMOTE_HWADDR
+QUERY4_REMOTE_HWADDR_TYPE
+QUERY4_OPTION_82
+QUERY4_OPTION_82_SUB_OPTION_1
+QUERY4_OPTION_82_SUB_OPTION_2
+LEASE4_ADDRESS
+LEASE4_CLTT
+LEASE4_HOSTNAME
+LEASE4_HWADDR
+LEASE4_HWADDR_TYPE
+LEASE4_STATE
+LEASE4_SUBNET_ID
+LEASE4_VALID_LIFETIME
+LEASE4_CLIENT_ID
+
+@endcode
+
+lease6_renew
+
+@code
+
+QUERY6_TYPE
+QUERY6_TXID
+QUERY6_LOCAL_ADDR
+QUERY6_LOCAL_PORT
+QUERY6_REMOTE_ADDR
+QUERY6_REMOTE_PORT
+QUERY6_IFACE_INDEX
+QUERY6_IFACE_NAME
+QUERY6_REMOTE_HWADDR
+QUERY6_REMOTE_HWADDR_TYPE
+QUERY6_PROTO
+QUERY6_CLIENT_ID
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+PKT6_IA_IAID
+PKT6_IA_IA_TYPE
+PKT6_IA_IA_T1
+PKT6_IA_IA_T2
+
+@endcode
+
+lease6_rebind
+
+@code
+
+QUERY6_TYPE
+QUERY6_TXID
+QUERY6_LOCAL_ADDR
+QUERY6_LOCAL_PORT
+QUERY6_REMOTE_ADDR
+QUERY6_REMOTE_PORT
+QUERY6_IFACE_INDEX
+QUERY6_IFACE_NAME
+QUERY6_REMOTE_HWADDR
+QUERY6_REMOTE_HWADDR_TYPE
+QUERY6_PROTO
+QUERY6_CLIENT_ID
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+PKT6_IA_IAID
+PKT6_IA_IA_TYPE
+PKT6_IA_IA_T1
+PKT6_IA_IA_T2
+
+@endcode
+
+lease6_expire
+
+@code
+
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+REMOVE_LEASE
+
+@endcode
+
+lease6_recover
+
+@code
+
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+
+@endcode
+
+leases6_committed
+
+@code
+
+QUERY6_TYPE
+QUERY6_TXID
+QUERY6_LOCAL_ADDR
+QUERY6_LOCAL_PORT
+QUERY6_REMOTE_ADDR
+QUERY6_REMOTE_PORT
+QUERY6_IFACE_INDEX
+QUERY6_IFACE_NAME
+QUERY6_REMOTE_HWADDR
+QUERY6_REMOTE_HWADDR_TYPE
+QUERY6_PROTO
+QUERY6_CLIENT_ID
+LEASES6_SIZE
+DELETED_LEASES6_SIZE
+
+@endcode
+
+If LEASES6_SIZE or DELETED_LEASES6_SIZE are non zero, then each lease
+will have it's own unique identifier as shown below. First index starts
+at 0.
+
+@code
+
+LEASES6_AT0_ADDRESS
+LEASES6_AT0_CLTT
+LEASES6_AT0_HOSTNAME
+LEASES6_AT0_HWADDR
+LEASES6_AT0_HWADDR_TYPE
+LEASES6_AT0_STATE
+LEASES6_AT0_SUBNET_ID
+LEASES6_AT0_VALID_LIFETIME
+LEASES6_AT0_DUID
+LEASES6_AT0_IAID
+LEASES6_AT0_PREFERRED_LIFETIME
+LEASES6_AT0_PREFIX_LEN
+LEASES6_AT0_TYPE
+DELETED_LEASES6_AT0_ADDRESS
+DELETED_LEASES6_AT0_CLTT
+DELETED_LEASES6_AT0_HOSTNAME
+DELETED_LEASES6_AT0_HWADDR
+DELETED_LEASES6_AT0_HWADDR_TYPE
+DELETED_LEASES6_AT0_STATE
+DELETED_LEASES6_AT0_SUBNET_ID
+DELETED_LEASES6_AT0_VALID_LIFETIME
+DELETED_LEASES6_AT0_DUID
+DELETED_LEASES6_AT0_IAID
+DELETED_LEASES6_AT0_PREFERRED_LIFETIME
+DELETED_LEASES6_AT0_PREFIX_LEN
+DELETED_LEASES6_AT0_TYPE
+
+@endcode
+
+lease6_release
+
+@code
+
+QUERY6_TYPE
+QUERY6_TXID
+QUERY6_LOCAL_ADDR
+QUERY6_LOCAL_PORT
+QUERY6_REMOTE_ADDR
+QUERY6_REMOTE_PORT
+QUERY6_IFACE_INDEX
+QUERY6_IFACE_NAME
+QUERY6_REMOTE_HWADDR
+QUERY6_REMOTE_HWADDR_TYPE
+QUERY6_PROTO
+QUERY6_CLIENT_ID
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+
+@endcode
+
+lease6_decline
+
+@code
+
+QUERY6_TYPE
+QUERY6_TXID
+QUERY6_LOCAL_ADDR
+QUERY6_LOCAL_PORT
+QUERY6_REMOTE_ADDR
+QUERY6_REMOTE_PORT
+QUERY6_IFACE_INDEX
+QUERY6_IFACE_NAME
+QUERY6_REMOTE_HWADDR
+QUERY6_REMOTE_HWADDR_TYPE
+QUERY6_PROTO
+QUERY6_CLIENT_ID
+LEASE6_ADDRESS
+LEASE6_CLTT
+LEASE6_HOSTNAME
+LEASE6_HWADDR
+LEASE6_HWADDR_TYPE
+LEASE6_STATE
+LEASE6_SUBNET_ID
+LEASE6_VALID_LIFETIME
+LEASE6_DUID
+LEASE6_IAID
+LEASE6_PREFERRED_LIFETIME
+LEASE6_PREFIX_LEN
+LEASE6_TYPE
+
+@endcode
+
+@section libdhcp_run_scriptMTCompatibility Multi-Threading Compatibility
+
+The Run Script hooks library is compatible with multi-threading.
+
+*/
diff --git a/src/hooks/dhcp/run_script/run_script.h b/src/hooks/dhcp/run_script/run_script.h
new file mode 100644
index 0000000..c66c82e
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script.h
@@ -0,0 +1,269 @@
+// Copyright (C) 2021 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 RUN_SCRIPT_H
+#define RUN_SCRIPT_H
+
+#include <asiolink/process_spawn.h>
+#include <dhcp/duid.h>
+#include <dhcp/hwaddr.h>
+#include <dhcp/option6_ia.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/subnet.h>
+#include <hooks/library_handle.h>
+#include <string>
+
+namespace isc {
+namespace run_script {
+
+/// @brief Run Script implementation.
+class RunScriptImpl {
+public:
+    /// @brief Constructor.
+    RunScriptImpl();
+
+    /// @brief Destructor.
+    ~RunScriptImpl() = default;
+
+    /// @brief Sets IO service to be used by the @ref ProcessSpawn instance.
+    ///
+    /// @param io_service The IOService object, used for all ASIO operations.
+    static void setIOService(const isc::asiolink::IOServicePtr& io_service) {
+        io_service_ = io_service;
+    }
+
+    /// @brief Gets IO service to be used by the @ref ProcessSpawn instance.
+    ///
+    /// @return The IOService object, used for all ASIO operations.
+    static isc::asiolink::IOServicePtr getIOService() {
+        return (io_service_);
+    }
+
+    /// @brief Extract boolean data and append to environment.
+    ///
+    /// @param value The value to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractBoolean(isc::asiolink::ProcessEnvVars& vars,
+                               const bool value,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract integer data and append to environment.
+    ///
+    /// @param value The value to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractInteger(isc::asiolink::ProcessEnvVars& vars,
+                               const uint64_t value,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract string data and append to environment.
+    ///
+    /// @param value The value to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractString(isc::asiolink::ProcessEnvVars& vars,
+                              const std::string& value,
+                              const std::string& prefix = "",
+                              const std::string& suffix = "");
+
+    /// @brief Extract HWAddr data and append to environment.
+    ///
+    /// @param hwaddr The hwaddr to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractHWAddr(isc::asiolink::ProcessEnvVars& vars,
+                              const isc::dhcp::HWAddrPtr& hwaddr,
+                              const std::string& prefix = "",
+                              const std::string& suffix = "");
+
+    /// @brief Extract DUID data and append to environment.
+    ///
+    /// @param duid The duid to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractDUID(isc::asiolink::ProcessEnvVars& vars,
+                            const isc::dhcp::DuidPtr duid,
+                            const std::string& prefix = "",
+                            const std::string& suffix = "");
+
+    /// @brief Extract Option data and append to environment.
+    ///
+    /// @param option The option to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractOption(isc::asiolink::ProcessEnvVars& vars,
+                              const isc::dhcp::OptionPtr option,
+                              const std::string& prefix = "",
+                              const std::string& suffix = "");
+
+    /// @brief Extract Option SubOption data and append to environment.
+    ///
+    /// @param option The parent option of the suboption to be exported to
+    /// target script environment.
+    /// @param code The code of the suboption.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractSubOption(isc::asiolink::ProcessEnvVars& vars,
+                                 const isc::dhcp::OptionPtr option,
+                                 uint16_t code,
+                                 const std::string& prefix = "",
+                                 const std::string& suffix = "");
+
+    /// @brief Extract Option6IA data and append to environment.
+    ///
+    /// @param option6IA The option6IA to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractOptionIA(isc::asiolink::ProcessEnvVars& vars,
+                                const isc::dhcp::Option6IAPtr option6IA,
+                                const std::string& prefix = "",
+                                const std::string& suffix = "");
+
+    /// @brief Extract Subnet4 data and append to environment.
+    ///
+    /// @param subnet4 The subnet4 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractSubnet4(isc::asiolink::ProcessEnvVars& vars,
+                               const isc::dhcp::Subnet4Ptr subnet4,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract Subnet6 data and append to environment.
+    ///
+    /// @param subnet6 The subnet6 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractSubnet6(isc::asiolink::ProcessEnvVars& vars,
+                               const isc::dhcp::Subnet6Ptr subnet6,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract Lease4 data and append to environment.
+    ///
+    /// @param lease4 The lease4 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractLease4(isc::asiolink::ProcessEnvVars& vars,
+                              const isc::dhcp::Lease4Ptr& lease4,
+                              const std::string& prefix = "",
+                              const std::string& suffix = "");
+
+    /// @brief Extract Lease6 data and append to environment.
+    ///
+    /// @param lease6 The lease6 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractLease6(isc::asiolink::ProcessEnvVars& vars,
+                              const isc::dhcp::Lease6Ptr& lease6,
+                              const std::string& prefix = "",
+                              const std::string& suffix = "");
+
+    /// @brief Extract Lease4Collection data and append to environment.
+    ///
+    /// @param leases4 The leases4 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractLeases4(isc::asiolink::ProcessEnvVars& vars,
+                               const isc::dhcp::Lease4CollectionPtr& leases4,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract Lease6Collection data and append to environment.
+    ///
+    /// @param leases6 The leases6 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractLeases6(isc::asiolink::ProcessEnvVars& vars,
+                               const isc::dhcp::Lease6CollectionPtr& leases6,
+                               const std::string& prefix = "",
+                               const std::string& suffix = "");
+
+    /// @brief Extract Pkt4 data and append to environment.
+    ///
+    /// @param pkt4 The pkt4 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractPkt4(isc::asiolink::ProcessEnvVars& vars,
+                            const isc::dhcp::Pkt4Ptr& pkt4,
+                            const std::string& prefix = "",
+                            const std::string& suffix = "");
+
+    /// @brief Extract Pkt6 data and append to environment.
+    ///
+    /// @param pkt6 The pkt6 to be exported to target script environment.
+    /// @param prefix The prefix for the name of the environment variable.
+    /// @param suffix The suffix for the name of the environment variable.
+    static void extractPkt6(isc::asiolink::ProcessEnvVars& vars,
+                            const isc::dhcp::Pkt6Ptr& pkt6,
+                            const std::string& prefix = "",
+                            const std::string& suffix = "");
+
+    /// @brief Run Script with specified arguments and environment parameters.
+    ///
+    /// @param args The arguments for the target script.
+    /// @param vars The environment variables made available for the target
+    /// script.
+    void runScript(const isc::asiolink::ProcessArgs& args,
+                   const isc::asiolink::ProcessEnvVars& vars);
+
+    /// @brief Set name of the target script.
+    ///
+    /// @param name The name of the target script.
+    void setName(const std::string& name) {
+        name_ = name;
+    }
+
+    /// @brief Get name of the target script.
+    ///
+    /// @return The name of the target script.
+    std::string getName() const {
+        return (name_);
+    }
+
+    /// @brief Set the synchronous call mode for the target script.
+    ///
+    /// @param name The synchronous call mode for the target script.
+    void setSync(const bool sync) {
+        sync_ = sync;
+    }
+
+    /// @brief Get the synchronous call mode for the target script.
+    ///
+    /// @return The synchronous call mode for the target script.
+    bool getSync() const {
+        return (sync_);
+    }
+
+    /// @brief This function parses and applies configuration parameters.
+    void configure(isc::hooks::LibraryHandle& handle);
+
+private:
+    /// @brief Script name.
+    std::string name_;
+
+    /// @brief Sync flag
+    ///
+    /// When set to true, the call to @ref runScript blocks until the script
+    /// exits, otherwise the call will return immediately after the script is
+    /// started.
+    bool sync_;
+
+    /// @brief The IOService object, used for all ASIO operations.
+    static isc::asiolink::IOServicePtr io_service_;
+};
+
+/// @brief The type of shared pointers to Run Script implementations.
+typedef boost::shared_ptr<RunScriptImpl> RunScriptImplPtr;
+
+} // namespace run_script
+} // namespace isc
+#endif
diff --git a/src/hooks/dhcp/run_script/run_script_callouts.cc b/src/hooks/dhcp/run_script/run_script_callouts.cc
new file mode 100644
index 0000000..d4f8421
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_callouts.cc
@@ -0,0 +1,431 @@
+// Copyright (C) 2021 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 <cc/command_interpreter.h>
+#include <hooks/hooks.h>
+#include <run_script.h>
+#include <run_script_log.h>
+#include <dhcp/option6_ia.h>
+#include <dhcp/pkt4.h>
+#include <dhcp/pkt6.h>
+#include <dhcpsrv/lease.h>
+#include <dhcpsrv/subnet.h>
+
+namespace isc {
+namespace run_script {
+
+RunScriptImplPtr impl;
+
+} // namespace run_script
+} // namespace isc
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::hooks;
+using namespace isc::run_script;
+using namespace isc::util;
+
+// Functions accessed by the hooks framework use C linkage to avoid the name
+// mangling that accompanies use of the C++ compiler as well as to avoid
+// issues related to namespaces.
+extern "C" {
+
+/// @brief This function is called when the library is loaded.
+///
+/// @param handle library handle
+/// @return 0 when initialization is successful, 1 otherwise
+int load(LibraryHandle& handle) {
+    try {
+        impl.reset(new RunScriptImpl());
+        impl->configure(handle);
+    } catch (const std::exception& ex) {
+        LOG_ERROR(run_script_logger, RUN_SCRIPT_LOAD_ERROR)
+            .arg(ex.what());
+        return (1);
+    }
+
+    LOG_INFO(run_script_logger, RUN_SCRIPT_LOAD);
+    return (0);
+}
+
+/// @brief This function is called when the library is unloaded.
+///
+/// @return always 0.
+int unload() {
+    impl.reset();
+    RunScriptImpl::setIOService(IOServicePtr());
+    LOG_INFO(run_script_logger, RUN_SCRIPT_UNLOAD);
+    return (0);
+}
+
+/// @brief dhcp4_srv_configured callout implementation.
+///
+/// @param handle callout handle.
+int dhcp4_srv_configured(CalloutHandle& handle) {
+    try {
+        isc::asiolink::IOServicePtr io_service;
+        handle.getArgument("io_context", io_service);
+        RunScriptImpl::setIOService(io_service);
+
+    } catch (const std::exception& ex) {
+        LOG_ERROR(run_script_logger, RUN_SCRIPT_LOAD_ERROR)
+            .arg(ex.what());
+        return (1);
+    }
+    return (0);
+}
+
+/// @brief dhcp6_srv_configured callout implementation.
+///
+/// @param handle callout handle.
+int dhcp6_srv_configured(CalloutHandle& handle) {
+    try {
+        isc::asiolink::IOServicePtr io_service;
+        handle.getArgument("io_context", io_service);
+        RunScriptImpl::setIOService(io_service);
+
+    } catch (const std::exception& ex) {
+        LOG_ERROR(run_script_logger, RUN_SCRIPT_LOAD_ERROR)
+            .arg(ex.what());
+        return (1);
+    }
+    return (0);
+}
+
+/// @brief handle @ref lease4_renew hook and set environment parameters for the
+/// script.
+/// IN: query4 subnet4 clientid hwaddr lease4
+/// OUT: next_step
+int lease4_renew(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt4Ptr pkt4;
+    handle.getArgument("query4", pkt4);
+    RunScriptImpl::extractPkt4(vars, pkt4, "QUERY4");
+    Subnet4Ptr subnet4;
+    handle.getArgument("subnet4", subnet4);
+    RunScriptImpl::extractSubnet4(vars, subnet4, "SUBNET4");
+    ClientIdPtr clientid;
+    handle.getArgument("clientid", clientid);
+    RunScriptImpl::extractDUID(vars, clientid, "PKT4_CLIENT_ID");
+    HWAddrPtr hwaddr;
+    handle.getArgument("hwaddr", hwaddr);
+    RunScriptImpl::extractHWAddr(vars, hwaddr, "PKT4_HWADDR");
+    Lease4Ptr lease4;
+    handle.getArgument("lease4", lease4);
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4");
+    ProcessArgs args;
+    args.push_back("lease4_renew");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease4_expire hook and set environment parameters for the
+/// script.
+/// IN: lease4 remove_lease
+/// OUT: next_step
+int lease4_expire(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Lease4Ptr lease4;
+    handle.getArgument("lease4", lease4);
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4");
+    bool remove_lease;
+    handle.getArgument("remove_lease", remove_lease);
+    RunScriptImpl::extractBoolean(vars, remove_lease, "REMOVE_LEASE");
+    ProcessArgs args;
+    args.push_back("lease4_expire");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease4_recover hook and set environment parameters for
+/// the script.
+/// IN: lease4
+/// OUT: next_step
+int lease4_recover(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Lease4Ptr lease4;
+    handle.getArgument("lease4", lease4);
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4");
+    ProcessArgs args;
+    args.push_back("lease4_recover");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref leases4_committed hook and set environment parameters for
+/// the script.
+/// IN: query4 leases4 deleted_leases4
+/// OUT: next_step
+int leases4_committed(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt4Ptr pkt4;
+    handle.getArgument("query4", pkt4);
+    RunScriptImpl::extractPkt4(vars, pkt4, "QUERY4");
+    Lease4CollectionPtr leases4;
+    handle.getArgument("leases4", leases4);
+    RunScriptImpl::extractLeases4(vars, leases4, "LEASES4");
+    Lease4CollectionPtr deleted_leases4;
+    handle.getArgument("deleted_leases4", deleted_leases4);
+    RunScriptImpl::extractLeases4(vars, deleted_leases4, "DELETED_LEASES4");
+    ProcessArgs args;
+    args.push_back("leases4_committed");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease4_release hook and set environment parameters for
+/// the script.
+/// IN: query4 lease4
+/// OUT: next_step
+int lease4_release(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt4Ptr pkt4;
+    handle.getArgument("query4", pkt4);
+    RunScriptImpl::extractPkt4(vars, pkt4, "QUERY4");
+    Lease4Ptr lease4;
+    handle.getArgument("lease4", lease4);
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4");
+    ProcessArgs args;
+    args.push_back("lease4_release");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease4_decline hook and set environment parameters for
+/// the script.
+/// IN: query4 lease4
+/// OUT: next_step
+int lease4_decline(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt4Ptr pkt4;
+    handle.getArgument("query4", pkt4);
+    RunScriptImpl::extractPkt4(vars, pkt4, "QUERY4");
+    Lease4Ptr lease4;
+    handle.getArgument("lease4", lease4);
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4");
+    ProcessArgs args;
+    args.push_back("lease4_decline");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_renew hook and set environment parameters for the
+/// script.
+/// IN: query6 lease6 ia_na/ia_pd
+/// OUT: next_step
+int lease6_renew(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    handle.getArgument("query6", pkt6);
+    RunScriptImpl::extractPkt6(vars, pkt6, "QUERY6");
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    Option6IAPtr option6IA;
+    if (lease6->type_ == Lease::TYPE_NA) {
+        handle.getArgument("ia_na", option6IA);
+    } else {
+        handle.getArgument("ia_pd", option6IA);
+    }
+    RunScriptImpl::extractOptionIA(vars, option6IA, "PKT6_IA");
+    ProcessArgs args;
+    args.push_back("lease6_renew");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_rebind hook and set environment parameters for the
+/// script.
+/// IN: query6 lease6 ia_na/ia_pd
+/// OUT: next_step
+int lease6_rebind(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    handle.getArgument("query6", pkt6);
+    RunScriptImpl::extractPkt6(vars, pkt6, "QUERY6");
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    Option6IAPtr option6IA;
+    if (lease6->type_ == Lease::TYPE_NA) {
+        handle.getArgument("ia_na", option6IA);
+    } else {
+        handle.getArgument("ia_pd", option6IA);
+    }
+    RunScriptImpl::extractOptionIA(vars, option6IA, "PKT6_IA");
+    ProcessArgs args;
+    args.push_back("lease6_rebind");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_expire hook and set environment parameters for the
+/// script.
+/// IN: lease6 remove_lease
+/// OUT: next_step
+int lease6_expire(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    bool remove_lease;
+    handle.getArgument("remove_lease", remove_lease);
+    RunScriptImpl::extractBoolean(vars, remove_lease, "REMOVE_LEASE");
+    ProcessArgs args;
+    args.push_back("lease6_expire");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_recover hook and set environment parameters for
+/// the script.
+/// IN: lease6
+/// OUT: next_step
+int lease6_recover(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    ProcessArgs args;
+    args.push_back("lease6_recover");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref leases6_committed hook and set environment parameters for
+/// the script.
+/// IN: query6 leases6 deleted_leases6
+/// OUT: next_step
+int leases6_committed(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    handle.getArgument("query6", pkt6);
+    RunScriptImpl::extractPkt6(vars, pkt6, "QUERY6");
+    Lease6CollectionPtr leases6;
+    handle.getArgument("leases6", leases6);
+    RunScriptImpl::extractLeases6(vars, leases6, "LEASES6");
+    Lease6CollectionPtr deleted_leases6;
+    handle.getArgument("deleted_leases6", deleted_leases6);
+    RunScriptImpl::extractLeases6(vars, deleted_leases6, "DELETED_LEASES6");
+    ProcessArgs args;
+    args.push_back("leases6_committed");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_release hook and set environment parameters for
+/// the script.
+/// IN: query6 lease6
+/// OUT: next_step
+int lease6_release(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    handle.getArgument("query6", pkt6);
+    RunScriptImpl::extractPkt6(vars, pkt6, "QUERY6");
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    ProcessArgs args;
+    args.push_back("lease6_release");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief handle @ref lease6_decline hook and set environment parameters for
+/// the script.
+/// IN: query6 lease6
+/// OUT: next_step
+int lease6_decline(CalloutHandle& handle) {
+    CalloutHandle::CalloutNextStep status = handle.getStatus();
+    if (status == CalloutHandle::NEXT_STEP_DROP ||
+        status == CalloutHandle::NEXT_STEP_SKIP) {
+        return (0);
+    }
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    handle.getArgument("query6", pkt6);
+    RunScriptImpl::extractPkt6(vars, pkt6, "QUERY6");
+    Lease6Ptr lease6;
+    handle.getArgument("lease6", lease6);
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6");
+    ProcessArgs args;
+    args.push_back("lease6_decline");
+    impl->runScript(args, vars);
+    return (0);
+}
+
+/// @brief This function is called to retrieve the multi-threading compatibility.
+///
+/// @return 1 which means compatible with multi-threading.
+int multi_threading_compatible() {
+    return (1);
+}
+
+} // end extern "C"
diff --git a/src/hooks/dhcp/run_script/run_script_log.cc b/src/hooks/dhcp/run_script/run_script_log.cc
new file mode 100644
index 0000000..02142e5
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_log.cc
@@ -0,0 +1,17 @@
+// Copyright (C) 2021 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 <run_script_log.h>
+
+namespace isc {
+namespace run_script {
+
+isc::log::Logger run_script_logger("run-script-hooks");
+
+} // namespace run_script
+} // namespace isc
diff --git a/src/hooks/dhcp/run_script/run_script_log.h b/src/hooks/dhcp/run_script/run_script_log.h
new file mode 100644
index 0000000..65c693a
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_log.h
@@ -0,0 +1,22 @@
+// Copyright (C) 2021 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 RUN_SCRIPT_LOG_H
+#define RUN_SCRIPT_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <log/log_dbglevels.h>
+#include <run_script_messages.h>
+
+namespace isc {
+namespace run_script {
+
+extern isc::log::Logger run_script_logger;
+
+} // namespace run_script
+} // namespace isc
+#endif
diff --git a/src/hooks/dhcp/run_script/run_script_messages.cc b/src/hooks/dhcp/run_script/run_script_messages.cc
new file mode 100644
index 0000000..ca99342
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_messages.cc
@@ -0,0 +1,23 @@
+// File created from ../../../../src/hooks/dhcp/run_script/run_script_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+extern const isc::log::MessageID RUN_SCRIPT_LOAD = "RUN_SCRIPT_LOAD";
+extern const isc::log::MessageID RUN_SCRIPT_LOAD_ERROR = "RUN_SCRIPT_LOAD_ERROR";
+extern const isc::log::MessageID RUN_SCRIPT_UNLOAD = "RUN_SCRIPT_UNLOAD";
+
+namespace {
+
+const char* values[] = {
+    "RUN_SCRIPT_LOAD", "Run Script hooks library has been loaded",
+    "RUN_SCRIPT_LOAD_ERROR", "Run Script hooks library failed: %1",
+    "RUN_SCRIPT_UNLOAD", "Run Script hooks library has been unloaded",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/hooks/dhcp/run_script/run_script_messages.h b/src/hooks/dhcp/run_script/run_script_messages.h
new file mode 100644
index 0000000..a70c8ca
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_messages.h
@@ -0,0 +1,12 @@
+// File created from ../../../../src/hooks/dhcp/run_script/run_script_messages.mes
+
+#ifndef RUN_SCRIPT_MESSAGES_H
+#define RUN_SCRIPT_MESSAGES_H
+
+#include <log/message_types.h>
+
+extern const isc::log::MessageID RUN_SCRIPT_LOAD;
+extern const isc::log::MessageID RUN_SCRIPT_LOAD_ERROR;
+extern const isc::log::MessageID RUN_SCRIPT_UNLOAD;
+
+#endif // RUN_SCRIPT_MESSAGES_H
diff --git a/src/hooks/dhcp/run_script/run_script_messages.mes b/src/hooks/dhcp/run_script/run_script_messages.mes
new file mode 100644
index 0000000..348b4ae
--- /dev/null
+++ b/src/hooks/dhcp/run_script/run_script_messages.mes
@@ -0,0 +1,11 @@
+# Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+
+% RUN_SCRIPT_LOAD Run Script hooks library has been loaded
+This info message indicates that the Run Script hooks library has been loaded.
+
+% RUN_SCRIPT_LOAD_ERROR Run Script hooks library failed: %1
+This error message indicates an error during loading the Run Script hooks
+library. The details of the error are provided as argument of the log message.
+
+% RUN_SCRIPT_UNLOAD Run Script hooks library has been unloaded
+This info message indicates that the RunScript hooks library has been unloaded.
diff --git a/src/hooks/dhcp/run_script/tests/Makefile.am b/src/hooks/dhcp/run_script/tests/Makefile.am
new file mode 100644
index 0000000..acff08d
--- /dev/null
+++ b/src/hooks/dhcp/run_script/tests/Makefile.am
@@ -0,0 +1,68 @@
+SUBDIRS = .
+
+SHTESTS = run_script_test.sh
+
+noinst_SCRIPTS = run_script_test.sh
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -I$(top_builddir)/src/hooks/dhcp/run_script -I$(top_srcdir)/src/hooks/dhcp/run_script
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += -DRUN_SCRIPT_LIB_SO=\"$(abs_top_builddir)/src/hooks/dhcp/run_script/.libs/libdhcp_run_script.so\"
+AM_CPPFLAGS += -DTEST_LOG_FILE=\"$(abs_top_builddir)/src/hooks/dhcp/run_script/tests/test.log\"
+AM_CPPFLAGS += -DRUN_SCRIPT_TEST_SH=\"$(abs_top_builddir)/src/hooks/dhcp/run_script/tests/run_script_test.sh\"
+AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+# Unit test data files need to get installed.
+EXTRA_DIST = run_script_test.sh.in
+
+CLEANFILES = *.gcno *.gcda
+
+DISTCLEANFILES = run_script_test.sh
+
+# TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+LOG_COMPILER = $(LIBTOOL)
+AM_LOG_FLAGS = --mode=execute
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_script_unittests
+
+run_script_unittests_SOURCES  = run_unittests.cc
+run_script_unittests_SOURCES += run_script_unittests.cc
+
+run_script_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES) $(LOG4CPLUS_INCLUDES)
+
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+
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+run_script_unittests_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/eval/libkea-eval.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/stats/libkea-stats.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/http/libkea-http.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/database/libkea-database.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/dns/libkea-dns++.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/cryptolink/libkea-cryptolink.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_script_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_script_unittests_LDADD += $(LOG4CPLUS_LIBS)
+run_script_unittests_LDADD += $(CRYPTO_LIBS)
+run_script_unittests_LDADD += $(BOOST_LIBS)
+run_script_unittests_LDADD += $(GTEST_LDADD)
+endif
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/hooks/dhcp/run_script/tests/Makefile.in b/src/hooks/dhcp/run_script/tests/Makefile.in
new file mode 100644
index 0000000..c0683ba
--- /dev/null
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+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+# This directory's subdirectories are mostly independent; you can cd
+# into them and run 'make' without going through this Makefile.
+# To change the values of 'make' variables: instead of editing Makefiles,
+# (1) if the variable is set in 'config.status', edit 'config.status'
+#     (which will cause the Makefiles to be regenerated when you run 'make');
+# (2) otherwise, pass the desired values on the 'make' command line.
+$(am__recursive_targets):
+	@fail=; \
+	if $(am__make_keepgoing); then \
+	  failcom='fail=yes'; \
+	else \
+	  failcom='exit 1'; \
+	fi; \
+	dot_seen=no; \
+	target=`echo $@ | sed s/-recursive//`; \
+	case "$@" in \
+	  distclean-* | maintainer-clean-*) list='$(DIST_SUBDIRS)' ;; \
+	  *) list='$(SUBDIRS)' ;; \
+	esac; \
+	for subdir in $$list; do \
+	  echo "Making $$target in $$subdir"; \
+	  if test "$$subdir" = "."; then \
+	    dot_seen=yes; \
+	    local_target="$$target-am"; \
+	  else \
+	    local_target="$$target"; \
+	  fi; \
+	  ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  || eval $$failcom; \
+	done; \
+	if test "$$dot_seen" = "no"; then \
+	  $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
+	fi; test -z "$$fail"
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+
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+	set x; \
+	here=`pwd`; \
+	if ($(ETAGS) --etags-include --version) >/dev/null 2>&1; then \
+	  include_option=--etags-include; \
+	  empty_fix=.; \
+	else \
+	  include_option=--include; \
+	  empty_fix=; \
+	fi; \
+	list='$(SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    test ! -f $$subdir/TAGS || \
+	      set "$$@" "$$include_option=$$here/$$subdir/TAGS"; \
+	  fi; \
+	done; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-recursive
+
+CTAGS: ctags
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-recursive
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+check-TESTS: $(TESTS)
+	@failed=0; all=0; xfail=0; xpass=0; skip=0; \
+	srcdir=$(srcdir); export srcdir; \
+	list=' $(TESTS) '; \
+	$(am__tty_colors); \
+	if test -n "$$list"; then \
+	  for tst in $$list; do \
+	    if test -f ./$$tst; then dir=./; \
+	    elif test -f $$tst; then dir=; \
+	    else dir="$(srcdir)/"; fi; \
+	    if $(TESTS_ENVIRONMENT) $${dir}$$tst $(AM_TESTS_FD_REDIRECT); then \
+	      all=`expr $$all + 1`; \
+	      case " $(XFAIL_TESTS) " in \
+	      *[\ \	]$$tst[\ \	]*) \
+		xpass=`expr $$xpass + 1`; \
+		failed=`expr $$failed + 1`; \
+		col=$$red; res=XPASS; \
+	      ;; \
+	      *) \
+		col=$$grn; res=PASS; \
+	      ;; \
+	      esac; \
+	    elif test $$? -ne 77; then \
+	      all=`expr $$all + 1`; \
+	      case " $(XFAIL_TESTS) " in \
+	      *[\ \	]$$tst[\ \	]*) \
+		xfail=`expr $$xfail + 1`; \
+		col=$$lgn; res=XFAIL; \
+	      ;; \
+	      *) \
+		failed=`expr $$failed + 1`; \
+		col=$$red; res=FAIL; \
+	      ;; \
+	      esac; \
+	    else \
+	      skip=`expr $$skip + 1`; \
+	      col=$$blu; res=SKIP; \
+	    fi; \
+	    echo "$${col}$$res$${std}: $$tst"; \
+	  done; \
+	  if test "$$all" -eq 1; then \
+	    tests="test"; \
+	    All=""; \
+	  else \
+	    tests="tests"; \
+	    All="All "; \
+	  fi; \
+	  if test "$$failed" -eq 0; then \
+	    if test "$$xfail" -eq 0; then \
+	      banner="$$All$$all $$tests passed"; \
+	    else \
+	      if test "$$xfail" -eq 1; then failures=failure; else failures=failures; fi; \
+	      banner="$$All$$all $$tests behaved as expected ($$xfail expected $$failures)"; \
+	    fi; \
+	  else \
+	    if test "$$xpass" -eq 0; then \
+	      banner="$$failed of $$all $$tests failed"; \
+	    else \
+	      if test "$$xpass" -eq 1; then passes=pass; else passes=passes; fi; \
+	      banner="$$failed of $$all $$tests did not behave as expected ($$xpass unexpected $$passes)"; \
+	    fi; \
+	  fi; \
+	  dashes="$$banner"; \
+	  skipped=""; \
+	  if test "$$skip" -ne 0; then \
+	    if test "$$skip" -eq 1; then \
+	      skipped="($$skip test was not run)"; \
+	    else \
+	      skipped="($$skip tests were not run)"; \
+	    fi; \
+	    test `echo "$$skipped" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$skipped"; \
+	  fi; \
+	  report=""; \
+	  if test "$$failed" -ne 0 && test -n "$(PACKAGE_BUGREPORT)"; then \
+	    report="Please report to $(PACKAGE_BUGREPORT)"; \
+	    test `echo "$$report" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS) $(SCRIPTS)
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/run_script_unittests-run_script_unittests.Po
+	-rm -f ./$(DEPDIR)/run_script_unittests-run_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/run_script_unittests-run_script_unittests.Po
+	-rm -f ./$(DEPDIR)/run_script_unittests-run_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/hooks/dhcp/run_script/tests/run_script_test.sh.in b/src/hooks/dhcp/run_script/tests/run_script_test.sh.in
new file mode 100644
index 0000000..9ebb2d7
--- /dev/null
+++ b/src/hooks/dhcp/run_script/tests/run_script_test.sh.in
@@ -0,0 +1,531 @@
+#!/bin/sh
+
+# Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+LOG_FILE="@abs_top_builddir@/src/hooks/dhcp/run_script/tests/test.log"
+
+ECHO_TO_FILE() {
+    echo "${@}"
+    echo "${@}" > ${LOG_FILE}
+}
+
+ASSERT_EQ() {
+    EXPECTED=${1}
+    ACTUAL=${2}
+    if ! test "${EXPECTED}" = "${ACTUAL}"; then
+        ECHO_TO_FILE "FAILED"
+        ECHO_TO_FILE "Values differ:"
+        ECHO_TO_FILE "    expected: ${EXPECTED}"
+        ECHO_TO_FILE "    actual: ${ACTUAL}"
+        exit 123
+    fi
+}
+
+TEST_EQ() {
+    TEST_VARIABLE=${1}
+    TEST_EXPECTED="${1}=${2}"
+    TEST_ACTUAL=$(env | grep -E "^${TEST_VARIABLE}=")
+    ASSERT_EQ "${TEST_EXPECTED}" "${TEST_ACTUAL}"
+}
+
+unknown_handle() {
+    ECHO_TO_FILE "Unhandled function call ${*}"
+    exit 123
+}
+
+lease4_renew () {
+    TEST_EQ "QUERY4_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY4_TXID" "0"
+    TEST_EQ "QUERY4_LOCAL_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_LOCAL_PORT" "67"
+    TEST_EQ "QUERY4_REMOTE_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_REMOTE_PORT" "68"
+    TEST_EQ "QUERY4_IFACE_INDEX" "2"
+    TEST_EQ "QUERY4_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY4_HOPS" "0"
+    TEST_EQ "QUERY4_SECS" "0"
+    TEST_EQ "QUERY4_FLAGS" "0"
+    TEST_EQ "QUERY4_CIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_SIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_YIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_GIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_RELAYED" "false"
+    TEST_EQ "QUERY4_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_LOCAL_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_LOCAL_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_OPTION_82" "0x0105686F776479020587F67977EF06061A2B3C4D5E6F"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_1" "0x686F776479"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_2" "0x87F67977EF"
+    TEST_EQ "SUBNET4_ID" "6"
+    TEST_EQ "SUBNET4_NAME" "182.168.0.1/2"
+    TEST_EQ "SUBNET4_PREFIX" "182.168.0.1"
+    TEST_EQ "SUBNET4_PREFIX_LEN" "2"
+    TEST_EQ "PKT4_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "PKT4_HWADDR" "00:01:02:03"
+    TEST_EQ "PKT4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASE4_CLTT" "3"
+    TEST_EQ "LEASE4_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE4_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_STATE" "default"
+    TEST_EQ "LEASE4_SUBNET_ID" "4"
+    TEST_EQ "LEASE4_VALID_LIFETIME" "2"
+    TEST_EQ "LEASE4_CLIENT_ID" "00:01:02:03:04:05:06"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease4_expire () {
+    TEST_EQ "LEASE4_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASE4_CLTT" "3"
+    TEST_EQ "LEASE4_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE4_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_STATE" "default"
+    TEST_EQ "LEASE4_SUBNET_ID" "4"
+    TEST_EQ "LEASE4_VALID_LIFETIME" "2"
+    TEST_EQ "LEASE4_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "REMOVE_LEASE" "true"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease4_recover () {
+    TEST_EQ "LEASE4_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASE4_CLTT" "3"
+    TEST_EQ "LEASE4_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE4_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_STATE" "default"
+    TEST_EQ "LEASE4_SUBNET_ID" "4"
+    TEST_EQ "LEASE4_VALID_LIFETIME" "2"
+    TEST_EQ "LEASE4_CLIENT_ID" "00:01:02:03:04:05:06"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+leases4_committed () {
+    TEST_EQ "QUERY4_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY4_TXID" "0"
+    TEST_EQ "QUERY4_LOCAL_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_LOCAL_PORT" "67"
+    TEST_EQ "QUERY4_REMOTE_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_REMOTE_PORT" "68"
+    TEST_EQ "QUERY4_IFACE_INDEX" "2"
+    TEST_EQ "QUERY4_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY4_HOPS" "0"
+    TEST_EQ "QUERY4_SECS" "0"
+    TEST_EQ "QUERY4_FLAGS" "0"
+    TEST_EQ "QUERY4_CIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_SIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_YIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_GIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_RELAYED" "false"
+    TEST_EQ "QUERY4_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_LOCAL_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_LOCAL_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_OPTION_82" "0x0105686F776479020587F67977EF06061A2B3C4D5E6F"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_1" "0x686F776479"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_2" "0x87F67977EF"
+    TEST_EQ "LEASES4_SIZE" "2"
+    TEST_EQ "LEASES4_AT0_ADDRESS" ""
+    TEST_EQ "LEASES4_AT0_CLTT" ""
+    TEST_EQ "LEASES4_AT0_HOSTNAME" ""
+    TEST_EQ "LEASES4_AT0_HWADDR" ""
+    TEST_EQ "LEASES4_AT0_HWADDR_TYPE" ""
+    TEST_EQ "LEASES4_AT0_STATE" ""
+    TEST_EQ "LEASES4_AT0_SUBNET_ID" ""
+    TEST_EQ "LEASES4_AT0_VALID_LIFETIME" ""
+    TEST_EQ "LEASES4_AT0_CLIENT_ID" ""
+    TEST_EQ "LEASES4_AT1_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASES4_AT1_CLTT" "3"
+    TEST_EQ "LEASES4_AT1_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASES4_AT1_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASES4_AT1_HWADDR_TYPE" "1"
+    TEST_EQ "LEASES4_AT1_STATE" "default"
+    TEST_EQ "LEASES4_AT1_SUBNET_ID" "4"
+    TEST_EQ "LEASES4_AT1_VALID_LIFETIME" "2"
+    TEST_EQ "LEASES4_AT1_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "DELETED_LEASES4_SIZE" "2"
+    TEST_EQ "DELETED_LEASES4_AT0_ADDRESS" "192.168.0.1"
+    TEST_EQ "DELETED_LEASES4_AT0_CLTT" "3"
+    TEST_EQ "DELETED_LEASES4_AT0_HOSTNAME" "test.hostname"
+    TEST_EQ "DELETED_LEASES4_AT0_HWADDR" "00:01:02:03"
+    TEST_EQ "DELETED_LEASES4_AT0_HWADDR_TYPE" "1"
+    TEST_EQ "DELETED_LEASES4_AT0_STATE" "default"
+    TEST_EQ "DELETED_LEASES4_AT0_SUBNET_ID" "4"
+    TEST_EQ "DELETED_LEASES4_AT0_VALID_LIFETIME" "2"
+    TEST_EQ "DELETED_LEASES4_AT0_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "DELETED_LEASES4_AT1_ADDRESS" ""
+    TEST_EQ "DELETED_LEASES4_AT1_CLTT" ""
+    TEST_EQ "DELETED_LEASES4_AT1_HOSTNAME" ""
+    TEST_EQ "DELETED_LEASES4_AT1_HWADDR" ""
+    TEST_EQ "DELETED_LEASES4_AT1_HWADDR_TYPE" ""
+    TEST_EQ "DELETED_LEASES4_AT1_STATE" ""
+    TEST_EQ "DELETED_LEASES4_AT1_SUBNET_ID" ""
+    TEST_EQ "DELETED_LEASES4_AT1_VALID_LIFETIME" ""
+    TEST_EQ "DELETED_LEASES4_AT1_CLIENT_ID" ""
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease4_release () {
+    TEST_EQ "QUERY4_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY4_TXID" "0"
+    TEST_EQ "QUERY4_LOCAL_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_LOCAL_PORT" "67"
+    TEST_EQ "QUERY4_REMOTE_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_REMOTE_PORT" "68"
+    TEST_EQ "QUERY4_IFACE_INDEX" "2"
+    TEST_EQ "QUERY4_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY4_HOPS" "0"
+    TEST_EQ "QUERY4_SECS" "0"
+    TEST_EQ "QUERY4_FLAGS" "0"
+    TEST_EQ "QUERY4_CIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_SIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_YIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_GIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_RELAYED" "false"
+    TEST_EQ "QUERY4_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_LOCAL_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_LOCAL_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_OPTION_82" "0x0105686F776479020587F67977EF06061A2B3C4D5E6F"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_1" "0x686F776479"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_2" "0x87F67977EF"
+    TEST_EQ "LEASE4_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASE4_CLTT" "3"
+    TEST_EQ "LEASE4_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE4_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_STATE" "default"
+    TEST_EQ "LEASE4_SUBNET_ID" "4"
+    TEST_EQ "LEASE4_VALID_LIFETIME" "2"
+    TEST_EQ "LEASE4_CLIENT_ID" "00:01:02:03:04:05:06"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease4_decline () {
+    TEST_EQ "QUERY4_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY4_TXID" "0"
+    TEST_EQ "QUERY4_LOCAL_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_LOCAL_PORT" "67"
+    TEST_EQ "QUERY4_REMOTE_ADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_REMOTE_PORT" "68"
+    TEST_EQ "QUERY4_IFACE_INDEX" "2"
+    TEST_EQ "QUERY4_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY4_HOPS" "0"
+    TEST_EQ "QUERY4_SECS" "0"
+    TEST_EQ "QUERY4_FLAGS" "0"
+    TEST_EQ "QUERY4_CIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_SIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_YIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_GIADDR" "0.0.0.0"
+    TEST_EQ "QUERY4_RELAYED" "false"
+    TEST_EQ "QUERY4_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_LOCAL_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_LOCAL_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY4_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY4_OPTION_82" "0x0105686F776479020587F67977EF06061A2B3C4D5E6F"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_1" "0x686F776479"
+    TEST_EQ "QUERY4_OPTION_82_SUB_OPTION_2" "0x87F67977EF"
+    TEST_EQ "LEASE4_ADDRESS" "192.168.0.1"
+    TEST_EQ "LEASE4_CLTT" "3"
+    TEST_EQ "LEASE4_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE4_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE4_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE4_STATE" "default"
+    TEST_EQ "LEASE4_SUBNET_ID" "4"
+    TEST_EQ "LEASE4_VALID_LIFETIME" "2"
+    TEST_EQ "LEASE4_CLIENT_ID" "00:01:02:03:04:05:06"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_renew () {
+    TEST_EQ "QUERY6_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY6_TXID" "0"
+    TEST_EQ "QUERY6_LOCAL_ADDR" "ff02::1:2"
+    TEST_EQ "QUERY6_LOCAL_PORT" "0"
+    TEST_EQ "QUERY6_REMOTE_ADDR" "fe80::21e:8cff:fe9b:7349"
+    TEST_EQ "QUERY6_REMOTE_PORT" "546"
+    TEST_EQ "QUERY6_IFACE_INDEX" "2"
+    TEST_EQ "QUERY6_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY6_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY6_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY6_PROTO" "UDP"
+    TEST_EQ "QUERY6_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    TEST_EQ "PKT6_IA_IAID" "2711790500"
+    TEST_EQ "PKT6_IA_IA_TYPE" "3"
+    TEST_EQ "PKT6_IA_IA_T1" "2164392708"
+    TEST_EQ "PKT6_IA_IA_T2" "2214789633"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_rebind () {
+    TEST_EQ "QUERY6_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY6_TXID" "0"
+    TEST_EQ "QUERY6_LOCAL_ADDR" "ff02::1:2"
+    TEST_EQ "QUERY6_LOCAL_PORT" "0"
+    TEST_EQ "QUERY6_REMOTE_ADDR" "fe80::21e:8cff:fe9b:7349"
+    TEST_EQ "QUERY6_REMOTE_PORT" "546"
+    TEST_EQ "QUERY6_IFACE_INDEX" "2"
+    TEST_EQ "QUERY6_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY6_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY6_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY6_PROTO" "UDP"
+    TEST_EQ "QUERY6_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    TEST_EQ "PKT6_IA_IAID" "2711790500"
+    TEST_EQ "PKT6_IA_IA_TYPE" "3"
+    TEST_EQ "PKT6_IA_IA_T1" "2164392708"
+    TEST_EQ "PKT6_IA_IA_T2" "2214789633"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_expire () {
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    TEST_EQ "REMOVE_LEASE" "true"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_recover () {
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+leases6_committed () {
+    TEST_EQ "QUERY6_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY6_TXID" "0"
+    TEST_EQ "QUERY6_LOCAL_ADDR" "ff02::1:2"
+    TEST_EQ "QUERY6_LOCAL_PORT" "0"
+    TEST_EQ "QUERY6_REMOTE_ADDR" "fe80::21e:8cff:fe9b:7349"
+    TEST_EQ "QUERY6_REMOTE_PORT" "546"
+    TEST_EQ "QUERY6_IFACE_INDEX" "2"
+    TEST_EQ "QUERY6_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY6_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY6_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY6_PROTO" "UDP"
+    TEST_EQ "QUERY6_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASES6_SIZE" "2"
+    TEST_EQ "LEASES6_AT0_ADDRESS" ""
+    TEST_EQ "LEASES6_AT0_CLTT" ""
+    TEST_EQ "LEASES6_AT0_HOSTNAME" ""
+    TEST_EQ "LEASES6_AT0_HWADDR" ""
+    TEST_EQ "LEASES6_AT0_HWADDR_TYPE" ""
+    TEST_EQ "LEASES6_AT0_STATE" ""
+    TEST_EQ "LEASES6_AT0_SUBNET_ID" ""
+    TEST_EQ "LEASES6_AT0_VALID_LIFETIME" ""
+    TEST_EQ "LEASES6_AT0_DUID" ""
+    TEST_EQ "LEASES6_AT0_IAID" ""
+    TEST_EQ "LEASES6_AT0_PREFERRED_LIFETIME" ""
+    TEST_EQ "LEASES6_AT0_PREFIX_LEN" ""
+    TEST_EQ "LEASES6_AT0_TYPE" ""
+    TEST_EQ "LEASES6_AT1_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASES6_AT1_CLTT" "7"
+    TEST_EQ "LEASES6_AT1_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASES6_AT1_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASES6_AT1_HWADDR_TYPE" "1"
+    TEST_EQ "LEASES6_AT1_STATE" "default"
+    TEST_EQ "LEASES6_AT1_SUBNET_ID" "5"
+    TEST_EQ "LEASES6_AT1_VALID_LIFETIME" "4"
+    TEST_EQ "LEASES6_AT1_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASES6_AT1_IAID" "2"
+    TEST_EQ "LEASES6_AT1_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASES6_AT1_PREFIX_LEN" "128"
+    TEST_EQ "LEASES6_AT1_TYPE" "IA_NA"
+    TEST_EQ "DELETED_LEASES6_SIZE" "2"
+    TEST_EQ "DELETED_LEASES6_AT0_ADDRESS" "2003:db8::1"
+    TEST_EQ "DELETED_LEASES6_AT0_CLTT" "7"
+    TEST_EQ "DELETED_LEASES6_AT0_HOSTNAME" "test.hostname"
+    TEST_EQ "DELETED_LEASES6_AT0_HWADDR" "00:01:02:03"
+    TEST_EQ "DELETED_LEASES6_AT0_HWADDR_TYPE" "1"
+    TEST_EQ "DELETED_LEASES6_AT0_STATE" "default"
+    TEST_EQ "DELETED_LEASES6_AT0_SUBNET_ID" "5"
+    TEST_EQ "DELETED_LEASES6_AT0_VALID_LIFETIME" "4"
+    TEST_EQ "DELETED_LEASES6_AT0_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "DELETED_LEASES6_AT0_IAID" "2"
+    TEST_EQ "DELETED_LEASES6_AT0_PREFERRED_LIFETIME" "3"
+    TEST_EQ "DELETED_LEASES6_AT0_PREFIX_LEN" "128"
+    TEST_EQ "DELETED_LEASES6_AT0_TYPE" "IA_NA"
+    TEST_EQ "DELETED_LEASES6_AT1_ADDRESS" ""
+    TEST_EQ "DELETED_LEASES6_AT1_CLTT" ""
+    TEST_EQ "DELETED_LEASES6_AT1_HOSTNAME" ""
+    TEST_EQ "DELETED_LEASES6_AT1_HWADDR" ""
+    TEST_EQ "DELETED_LEASES6_AT1_HWADDR_TYPE" ""
+    TEST_EQ "DELETED_LEASES6_AT1_STATE" ""
+    TEST_EQ "DELETED_LEASES6_AT1_SUBNET_ID" ""
+    TEST_EQ "DELETED_LEASES6_AT1_VALID_LIFETIME" ""
+    TEST_EQ "DELETED_LEASES6_AT1_DUID" ""
+    TEST_EQ "DELETED_LEASES6_AT1_IAID" ""
+    TEST_EQ "DELETED_LEASES6_AT1_PREFERRED_LIFETIME" ""
+    TEST_EQ "DELETED_LEASES6_AT1_PREFIX_LEN" ""
+    TEST_EQ "DELETED_LEASES6_AT1_TYPE" ""
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_release () {
+    TEST_EQ "QUERY6_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY6_TXID" "0"
+    TEST_EQ "QUERY6_LOCAL_ADDR" "ff02::1:2"
+    TEST_EQ "QUERY6_LOCAL_PORT" "0"
+    TEST_EQ "QUERY6_REMOTE_ADDR" "fe80::21e:8cff:fe9b:7349"
+    TEST_EQ "QUERY6_REMOTE_PORT" "546"
+    TEST_EQ "QUERY6_IFACE_INDEX" "2"
+    TEST_EQ "QUERY6_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY6_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY6_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY6_PROTO" "UDP"
+    TEST_EQ "QUERY6_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+lease6_decline () {
+    TEST_EQ "QUERY6_TYPE" "UNKNOWN"
+    TEST_EQ "QUERY6_TXID" "0"
+    TEST_EQ "QUERY6_LOCAL_ADDR" "ff02::1:2"
+    TEST_EQ "QUERY6_LOCAL_PORT" "0"
+    TEST_EQ "QUERY6_REMOTE_ADDR" "fe80::21e:8cff:fe9b:7349"
+    TEST_EQ "QUERY6_REMOTE_PORT" "546"
+    TEST_EQ "QUERY6_IFACE_INDEX" "2"
+    TEST_EQ "QUERY6_IFACE_NAME" "eth1"
+    TEST_EQ "QUERY6_REMOTE_HWADDR" "00:01:02:03"
+    TEST_EQ "QUERY6_REMOTE_HWADDR_TYPE" "1"
+    TEST_EQ "QUERY6_PROTO" "UDP"
+    TEST_EQ "QUERY6_CLIENT_ID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_ADDRESS" "2003:db8::1"
+    TEST_EQ "LEASE6_CLTT" "7"
+    TEST_EQ "LEASE6_HOSTNAME" "test.hostname"
+    TEST_EQ "LEASE6_HWADDR" "00:01:02:03"
+    TEST_EQ "LEASE6_HWADDR_TYPE" "1"
+    TEST_EQ "LEASE6_STATE" "default"
+    TEST_EQ "LEASE6_SUBNET_ID" "5"
+    TEST_EQ "LEASE6_VALID_LIFETIME" "4"
+    TEST_EQ "LEASE6_DUID" "00:01:02:03:04:05:06"
+    TEST_EQ "LEASE6_IAID" "2"
+    TEST_EQ "LEASE6_PREFERRED_LIFETIME" "3"
+    TEST_EQ "LEASE6_PREFIX_LEN" "128"
+    TEST_EQ "LEASE6_TYPE" "IA_NA"
+    ECHO_TO_FILE "SUCCESS"
+}
+
+case "$1" in
+    "lease4_renew")
+        lease4_renew
+        ;;
+    "lease4_expire")
+        lease4_expire
+        ;;
+    "lease4_recover")
+        lease4_recover
+        ;;
+    "leases4_committed")
+        leases4_committed
+        ;;
+    "lease4_release")
+        lease4_release
+        ;;
+    "lease4_decline")
+        lease4_decline
+        ;;
+    "lease6_renew")
+        lease6_renew
+        ;;
+    "lease6_rebind")
+        lease6_rebind
+        ;;
+    "lease6_expire")
+        lease6_expire
+        ;;
+    "lease6_recover")
+        lease6_recover
+        ;;
+    "leases6_committed")
+        leases6_committed
+        ;;
+    "lease6_release")
+        lease6_release
+        ;;
+    "lease6_decline")
+        lease6_decline
+        ;;
+    *)
+        unknown_handle "${@}"
+        ;;
+esac
diff --git a/src/hooks/dhcp/run_script/tests/run_script_unittests.cc b/src/hooks/dhcp/run_script/tests/run_script_unittests.cc
new file mode 100644
index 0000000..46d9c8d
--- /dev/null
+++ b/src/hooks/dhcp/run_script/tests/run_script_unittests.cc
@@ -0,0 +1,1035 @@
+// Copyright (C) 2021 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 <run_script.h>
+
+#include <asiolink/io_address.h>
+#include <asiolink/io_service.h>
+#include <cc/data.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option.h>
+#include <dhcp/option_custom.h>
+#include <dhcp/option_int.h>
+#include <hooks/callout_manager.h>
+#include <hooks/hooks.h>
+#include <hooks/hooks_manager.h>
+
+#include <cstdio>
+#include <fstream>
+
+#include <gtest/gtest.h>
+
+using namespace isc::run_script;
+
+using namespace isc::asiolink;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::hooks;
+using namespace isc::util;
+using namespace std;
+
+extern "C" {
+extern int lease4_renew(CalloutHandle& handle);
+extern int lease4_expire(CalloutHandle& handle);
+extern int lease4_recover(CalloutHandle& handle);
+extern int leases4_committed(CalloutHandle& handle);
+extern int lease4_release(CalloutHandle& handle);
+extern int lease4_decline(CalloutHandle& handle);
+extern int lease6_renew(CalloutHandle& handle);
+extern int lease6_rebind(CalloutHandle& handle);
+extern int lease6_expire(CalloutHandle& handle);
+extern int lease6_recover(CalloutHandle& handle);
+extern int leases6_committed(CalloutHandle& handle);
+extern int lease6_release(CalloutHandle& handle);
+extern int lease6_decline(CalloutHandle& handle);
+}
+
+namespace isc {
+namespace run_script {
+
+extern RunScriptImplPtr impl;
+
+} // namespace run_script
+} // namespace isc
+
+namespace {
+
+/// @brief This function joins all received environment variables and adds a
+/// newline after each one so that a simple compare can be done in the test.
+///
+/// @param vars The list of environment variables to join.
+/// @return The joined environment.
+string
+join(const ProcessEnvVars& vars) {
+    string result;
+    for (auto var : vars) {
+        result += var + "\n";
+    }
+    return (result);
+}
+
+/// @brief Generate a valid HWAddr.
+///
+/// @return The generated HWAddr.
+HWAddrPtr
+generateHWAddr() {
+    return (HWAddrPtr(new HWAddr({0, 1, 2 ,3}, HTYPE_ETHER)));
+}
+
+/// @brief Generate a valid DUID.
+///
+/// @return The generated DUID.
+ClientIdPtr
+generateDUID() {
+    return (ClientIdPtr(new ClientId({0, 1, 2, 3, 4, 5, 6})));
+}
+
+/// @brief Generate a valid Option.
+///
+/// @param universe The option universe (V4 or V6).
+/// @param code The Option code to use.
+/// @return The generated Option.
+OptionPtr
+generateOption(Option::Universe universe, uint16_t code, OptionBuffer& data) {
+    OptionDefinitionPtr def = LibDHCP::getOptionDef(universe == Option::V4 ?
+                                                    DHCP4_OPTION_SPACE : DHCP6_OPTION_SPACE,
+                                                    code);
+    if (def) {
+        return (OptionCustomPtr(new OptionCustom(*def, universe, data)));
+    }
+
+    return (OptionPtr());
+}
+
+/// @brief Generate a valid Option6IA.
+///
+/// @return The generated Option6IA.
+Option6IAPtr
+generateOptionIA() {
+    OptionBuffer buf;
+    buf.resize(12);
+    buf[0] = 0xa1; // iaid
+    buf[1] = 0xa2;
+    buf[2] = 0xa3;
+    buf[3] = 0xa4;
+    buf[4] = 0x81; // T1
+    buf[5] = 0x02;
+    buf[6] = 0x03;
+    buf[7] = 0x04;
+    buf[8] = 0x84; // T2
+    buf[9] = 0x03;
+    buf[10] = 0x02;
+    buf[11] = 0x01;
+
+    return (Option6IAPtr(new Option6IA(D6O_IA_NA, buf.begin(), buf.end())));
+}
+
+/// @brief Generate a valid Subnet4.
+///
+/// @return The generated Subnet4.
+Subnet4Ptr
+generateSubnet4() {
+    return (Subnet4Ptr(new Subnet4(IOAddress("182.168.0.1"), 2, 3, 4, 5, 6)));
+}
+
+/// @brief Generate a valid Subnet6.
+///
+/// @return The generated Subnet6.
+Subnet6Ptr
+generateSubnet6() {
+    return (Subnet6Ptr(new Subnet6(IOAddress("2003:db8::1"), 2, 3, 4, 5, 6, 7)));
+}
+
+/// @brief Generate a valid Lease4.
+///
+/// @return The generated Lease4.
+Lease4Ptr
+generateLease4() {
+    HWAddrPtr hwaddr = generateHWAddr();
+    ClientIdPtr clientid = generateDUID();
+
+    Lease4Ptr lease4(new Lease4(IOAddress("192.168.0.1"), hwaddr, clientid,
+                                2, 3, 4, false, false, "test.hostname"));
+
+    return(lease4);
+}
+
+/// @brief Generate a valid Lease6.
+///
+/// @return The generated Lease6.
+Lease6Ptr
+generateLease6() {
+    HWAddrPtr hwaddr = generateHWAddr();
+    DuidPtr duid = generateDUID();
+
+    Lease6Ptr lease6(new Lease6(Lease::TYPE_NA, IOAddress("2003:db8::1"), duid,
+                                2, 3, 4, 5, false, false, "test.hostname",
+                                hwaddr));
+
+    lease6->cltt_ = 7;
+
+    return (lease6);
+}
+
+/// @brief Generate a Pkt4 with all parameters set.
+///
+/// @return The generated Pkt4.
+Pkt4Ptr
+generatePkt4() {
+    // A dummy MAC address, padded with 0s
+    const uint8_t dummyChaddr[16] = {0, 1, 2, 3, 4, 5, 0, 0,
+                                     0, 0, 0, 0, 0, 0, 0, 0 };
+
+    // Let's use some creative test content here (128 chars + \0)
+    const uint8_t dummyFile[] = "Lorem ipsum dolor sit amet, consectetur "
+        "adipiscing elit. Proin mollis placerat metus, at "
+        "lacinia orci ornare vitae. Mauris amet.";
+
+    // Yet another type of test content (64 chars + \0)
+    const uint8_t dummySname[] = "Lorem ipsum dolor sit amet, consectetur "
+        "adipiscing elit posuere.";
+
+    // That is only part of the header. It contains all "short" fields,
+    // larger fields are constructed separately.
+    uint8_t hdr[] = {
+        1, 6, 6, 13,            // op, htype, hlen, hops,
+        0x12, 0x34, 0x56, 0x78, // transaction-id
+        0, 42, 0x80, 0x00,      // 42 secs, BROADCAST flags
+        192, 0, 2, 1,           // ciaddr
+        1, 2, 3, 4,             // yiaddr
+        192, 0, 2, 255,         // siaddr
+        192, 0, 2, 50,          // giaddr
+    };
+
+    // Initialize the vector with the header fields defined above.
+    vector<uint8_t> buf(hdr, hdr + sizeof(hdr));
+
+    // Append the large header fields.
+    copy(dummyChaddr, dummyChaddr + Pkt4::MAX_CHADDR_LEN, back_inserter(buf));
+    copy(dummySname, dummySname + Pkt4::MAX_SNAME_LEN, back_inserter(buf));
+    copy(dummyFile, dummyFile + Pkt4::MAX_FILE_LEN, back_inserter(buf));
+
+    // Should now have all the header, so check.  The "static_cast" is used
+    // to get round an odd bug whereby the linker appears not to find the
+    // definition of DHCPV4_PKT_HDR_LEN if it appears within an EXPECT_EQ().
+    EXPECT_EQ(static_cast<size_t>(Pkt4::DHCPV4_PKT_HDR_LEN), buf.size());
+
+    // Add magic cookie
+    buf.push_back(0x63);
+    buf.push_back(0x82);
+    buf.push_back(0x53);
+    buf.push_back(0x63);
+
+    // Add message type DISCOVER
+    buf.push_back(static_cast<uint8_t>(DHO_DHCP_MESSAGE_TYPE));
+    buf.push_back(1); // length (just one byte)
+    buf.push_back(static_cast<uint8_t>(DHCPDISCOVER));
+
+    Pkt4Ptr pkt4(new Pkt4(&buf[0], buf.size()));
+
+    pkt4->setIface("eth1");
+    pkt4->setIndex(2);
+
+    pkt4->setHWAddr(generateHWAddr());
+    pkt4->setLocalHWAddr(generateHWAddr());
+    pkt4->setRemoteHWAddr(generateHWAddr());
+
+    OptionDefinitionPtr rai_def = LibDHCP::getOptionDef(DHCP4_OPTION_SPACE,
+                                                        DHO_DHCP_AGENT_OPTIONS);
+
+    OptionCustomPtr rai(new OptionCustom(*rai_def, Option::V4));
+
+    uint8_t circuit_id[] = { 0x68, 0x6f, 0x77, 0x64, 0x79 };
+    OptionPtr circuit_id_opt(new Option(Option::V4, RAI_OPTION_AGENT_CIRCUIT_ID,
+                                        OptionBuffer(circuit_id,
+                                        circuit_id + sizeof(circuit_id))));
+    rai->addOption(circuit_id_opt);
+
+    uint8_t subscriber_id[] = { 0x1a, 0x2b, 0x3c, 0x4d, 0x5e, 0x6f };
+    OptionPtr subscriber_id_opt(new Option(Option::V4, RAI_OPTION_SUBSCRIBER_ID,
+                                           OptionBuffer(subscriber_id,
+                                           subscriber_id + sizeof(subscriber_id))));
+    rai->addOption(subscriber_id_opt);
+
+    uint8_t remote_id[] = { 0x87, 0xf6, 0x79, 0x77, 0xef };
+    OptionPtr remote_id_opt(new Option(Option::V4, RAI_OPTION_REMOTE_ID,
+                                       OptionBuffer(remote_id,
+                                       remote_id + sizeof(remote_id))));
+    rai->addOption(remote_id_opt);
+
+    pkt4->addOption(rai);
+
+    return (pkt4);
+}
+
+/// @brief Generate a Pkt6 with all parameters set.
+///
+/// @return The generated Pkt6.
+Pkt6Ptr
+generatePkt6() {
+    // That is only part of the header. It contains all "short" fields,
+    // larger fields are constructed separately.
+    uint8_t data[98];
+    data[0]  = 1;
+    data[1]  = 1;       data[2]  = 2;     data[3] = 3;      data[4]  = 0;
+    data[5]  = 1;       data[6]  = 0;     data[7] = 14;     data[8]  = 0;
+    data[9]  = 1;       data[10] = 0;     data[11] = 1;     data[12] = 21;
+    data[13] = 158;     data[14] = 60;    data[15] = 22;    data[16] = 0;
+    data[17] = 30;      data[18] = 140;   data[19] = 155;   data[20] = 115;
+    data[21] = 73;      data[22] = 0;     data[23] = 3;     data[24] = 0;
+    data[25] = 40;      data[26] = 0;     data[27] = 0;     data[28] = 0;
+    data[29] = 1;       data[30] = 255;   data[31] = 255;   data[32] = 255;
+    data[33] = 255;     data[34] = 255;   data[35] = 255;   data[36] = 255;
+    data[37] = 255;     data[38] = 0;     data[39] = 5;     data[40] = 0;
+    data[41] = 24;      data[42] = 32;    data[43] = 1;     data[44] = 13;
+    data[45] = 184;     data[46] = 0;     data[47] = 1;     data[48] = 0;
+    data[49] = 0;       data[50] = 0;     data[51] = 0;     data[52] = 0;
+    data[53] = 0;       data[54] = 0;     data[55] = 0;     data[56] = 18;
+    data[57] = 52;      data[58] = 255;   data[59] = 255;   data[60] = 255;
+    data[61] = 255;     data[62] = 255;   data[63] = 255;   data[64] = 255;
+    data[65] = 255;     data[66] = 0;     data[67] = 23;    data[68] = 0;
+    data[69] = 16;      data[70] = 32;    data[71] = 1;     data[72] = 13;
+    data[73] = 184;     data[74] = 0;     data[75] = 1;     data[76] = 0;
+    data[77] = 0;       data[78] = 0;     data[79] = 0;     data[80] = 0;
+    data[81] = 0;       data[82] = 0;     data[83] = 0;     data[84] = 221;
+    data[85] = 221;     data[86] = 0;     data[87] = 8;     data[88] = 0;
+    data[89] = 2;       data[90] = 0;     data[91] = 100;   data[92] = 0;
+    data[93] = 6;       data[94] = 0;     data[95] = 2;     data[96] = 0;
+    data[97] = 23;
+
+    Pkt6Ptr pkt6(new Pkt6(data, sizeof(data)));
+
+    pkt6->setRemotePort(546);
+    pkt6->setRemoteAddr(IOAddress("fe80::21e:8cff:fe9b:7349"));
+    pkt6->setLocalPort(0);
+    pkt6->setLocalAddr(IOAddress("ff02::1:2"));
+
+    pkt6->setIface("eth1");
+    pkt6->setIndex(2);
+
+    pkt6->setRemoteHWAddr(generateHWAddr());
+    pkt6->addOption(OptionPtr(new Option(Option::V6, D6O_CLIENTID,
+                              generateDUID()->getDuid())));
+
+    return (pkt6);
+}
+
+/// @brief Tests the RunScript setName and getName functions.
+TEST(RunScript, testSetNameGetName) {
+    RunScriptImpl script;
+    string script_name = "test";
+    ASSERT_NO_THROW(script.setName(script_name));
+    EXPECT_EQ(script_name, script.getName());
+}
+
+/// @brief Tests the RunScript setSync and getSync functions.
+TEST(RunScript, testSetSyncGetSync) {
+    RunScriptImpl script;
+    bool sync = true;
+    ASSERT_NO_THROW(script.setSync(sync));
+    EXPECT_EQ(sync, script.getSync());
+}
+
+/// @brief Tests the extractBoolean method works as expected.
+TEST(RunScript, extractBoolean) {
+    ProcessEnvVars vars;
+    bool flag = false;
+    RunScriptImpl::extractBoolean(vars, flag, "FALSE_PREFIX", "_FALSE_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "FALSE_PREFIX_FALSE_SUFFIX=false\n";
+    EXPECT_EQ(expected, join(vars));
+    flag = true;
+    RunScriptImpl::extractBoolean(vars, flag, "TRUE_PREFIX", "_TRUE_SUFFIX");
+    ASSERT_EQ(2, vars.size());
+    expected = "FALSE_PREFIX_FALSE_SUFFIX=false\n"
+               "TRUE_PREFIX_TRUE_SUFFIX=true\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractInteger method works as expected.
+TEST(RunScript, extractInteger) {
+    ProcessEnvVars vars;
+    uint64_t value = 0;
+    RunScriptImpl::extractInteger(vars, value, "ZERO_PREFIX", "_ZERO_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "ZERO_PREFIX_ZERO_SUFFIX=0\n";
+    EXPECT_EQ(expected, join(vars));
+    value = 1;
+    RunScriptImpl::extractInteger(vars, value, "ONE_PREFIX", "_ONE_SUFFIX");
+    ASSERT_EQ(2, vars.size());
+    expected = "ZERO_PREFIX_ZERO_SUFFIX=0\n"
+               "ONE_PREFIX_ONE_SUFFIX=1\n";
+    EXPECT_EQ(expected, join(vars));
+    value = 1000;
+    RunScriptImpl::extractInteger(vars, value, "THOUSAND_PREFIX", "_THOUSAND_SUFFIX");
+    ASSERT_EQ(3, vars.size());
+    expected = "ZERO_PREFIX_ZERO_SUFFIX=0\n"
+               "ONE_PREFIX_ONE_SUFFIX=1\n"
+               "THOUSAND_PREFIX_THOUSAND_SUFFIX=1000\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractString method works as expected.
+TEST(RunScript, extractString) {
+    ProcessEnvVars vars;
+    string value = "";
+    RunScriptImpl::extractString(vars, value, "EMPTY_PREFIX", "_EMPTY_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "EMPTY_PREFIX_EMPTY_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    value = "SOMETHING";
+    RunScriptImpl::extractString(vars, value, "NON_EMPTY_PREFIX", "_NON_EMPTY_SUFFIX");
+    ASSERT_EQ(2, vars.size());
+    expected = "EMPTY_PREFIX_EMPTY_SUFFIX=\n"
+               "NON_EMPTY_PREFIX_NON_EMPTY_SUFFIX=SOMETHING\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractHWAddr method works as expected.
+TEST(RunScript, extractHWAddr) {
+    ProcessEnvVars vars;
+    HWAddrPtr hwaddr;
+    RunScriptImpl::extractHWAddr(vars, hwaddr, "HWADDR_PREFIX", "_HWADDR_SUFFIX");
+    ASSERT_EQ(2, vars.size());
+    string expected = "HWADDR_PREFIX_HWADDR_SUFFIX=\n"
+                      "HWADDR_PREFIX_TYPE_HWADDR_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    hwaddr = generateHWAddr();
+    RunScriptImpl::extractHWAddr(vars, hwaddr, "HWADDR_PREFIX", "_HWADDR_SUFFIX");
+    ASSERT_EQ(2, vars.size());
+    expected = "HWADDR_PREFIX_HWADDR_SUFFIX=00:01:02:03\n"
+               "HWADDR_PREFIX_TYPE_HWADDR_SUFFIX=1\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractDUID method works as expected.
+TEST(RunScript, extractDUID) {
+    ProcessEnvVars vars;
+    DuidPtr duid;
+    RunScriptImpl::extractDUID(vars, duid, "DUID_PREFIX", "_DUID_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "DUID_PREFIX_DUID_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    duid = generateDUID();
+    RunScriptImpl::extractDUID(vars, duid, "DUID_PREFIX", "_DUID_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    expected = "DUID_PREFIX_DUID_SUFFIX=00:01:02:03:04:05:06\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractOption method works as expected.
+TEST(RunScript, extractOption) {
+    ProcessEnvVars vars;
+    OptionPtr option;
+    RunScriptImpl::extractOption(vars, option, "OPTION_PREFIX", "_OPTION_SUFFIX");
+    ASSERT_EQ(0, vars.size());
+    OptionBuffer buffer = { 0xca, 0xfe, 0xba, 0xbe };
+    option = generateOption(Option::V4, DHO_USER_CLASS, buffer);
+    RunScriptImpl::extractOption(vars, option, "OPTION_PREFIX", "_OPTION_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "OPTION_PREFIX_OPTION_77_OPTION_SUFFIX=0xCAFEBABE\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractSubOption method works as expected.
+TEST(RunScript, extractSubOption) {
+    ProcessEnvVars vars;
+    OptionPtr option;
+    RunScriptImpl::extractOption(vars, option, "OPTION_SUBOPTION_PREFIX", "_OPTION_SUBOPTION_SUFFIX");
+    ASSERT_EQ(0, vars.size());
+    OptionBuffer data;
+    option = generateOption(Option::V4, DHO_DHCP_AGENT_OPTIONS, data);
+    uint8_t subscriber_id[] = { 0x1a, 0x2b, 0x3c, 0x4d, 0x5e, 0x6f };
+    OptionPtr subscriber_id_opt(new Option(Option::V4, RAI_OPTION_SUBSCRIBER_ID,
+                                           OptionBuffer(subscriber_id,
+                                           subscriber_id + sizeof(subscriber_id))));
+    option->addOption(subscriber_id_opt);
+    RunScriptImpl::extractSubOption(vars, option, RAI_OPTION_SUBSCRIBER_ID, "OPTION_SUBOPTION_PREFIX", "_OPTION_SUBOPTION_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "OPTION_SUBOPTION_PREFIX_OPTION_82_SUB_OPTION_6_OPTION_SUBOPTION_SUFFIX=0x1A2B3C4D5E6F\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractOptionIA method works as expected.
+TEST(RunScript, extractOptionIA) {
+    ProcessEnvVars vars;
+    Option6IAPtr optionia;
+    RunScriptImpl::extractOptionIA(vars, optionia, "OPTIONIA_PREFIX", "_OPTIONIA_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    string expected = "OPTIONIA_PREFIX_IAID_OPTIONIA_SUFFIX=\n"
+                      "OPTIONIA_PREFIX_IA_TYPE_OPTIONIA_SUFFIX=\n"
+                      "OPTIONIA_PREFIX_IA_T1_OPTIONIA_SUFFIX=\n"
+                      "OPTIONIA_PREFIX_IA_T2_OPTIONIA_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    optionia = generateOptionIA();
+    RunScriptImpl::extractOptionIA(vars, optionia, "OPTIONIA_PREFIX", "_OPTIONIA_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    expected = "OPTIONIA_PREFIX_IAID_OPTIONIA_SUFFIX=2711790500\n"
+               "OPTIONIA_PREFIX_IA_TYPE_OPTIONIA_SUFFIX=3\n"
+               "OPTIONIA_PREFIX_IA_T1_OPTIONIA_SUFFIX=2164392708\n"
+               "OPTIONIA_PREFIX_IA_T2_OPTIONIA_SUFFIX=2214789633\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractSubnet4 method works as expected.
+TEST(RunScript, extractSubnet4) {
+    ProcessEnvVars vars;
+    Subnet4Ptr subnet4;
+    RunScriptImpl::extractSubnet4(vars, subnet4, "SUBNET4_PREFIX", "_SUBNET4_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    string expected = "SUBNET4_PREFIX_ID_SUBNET4_SUFFIX=\n"
+                      "SUBNET4_PREFIX_NAME_SUBNET4_SUFFIX=\n"
+                      "SUBNET4_PREFIX_PREFIX_SUBNET4_SUFFIX=\n"
+                      "SUBNET4_PREFIX_PREFIX_LEN_SUBNET4_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    subnet4 = generateSubnet4();
+    RunScriptImpl::extractSubnet4(vars, subnet4, "SUBNET4_PREFIX", "_SUBNET4_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    expected = "SUBNET4_PREFIX_ID_SUBNET4_SUFFIX=6\n"
+               "SUBNET4_PREFIX_NAME_SUBNET4_SUFFIX=182.168.0.1/2\n"
+               "SUBNET4_PREFIX_PREFIX_SUBNET4_SUFFIX=182.168.0.1\n"
+               "SUBNET4_PREFIX_PREFIX_LEN_SUBNET4_SUFFIX=2\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractSubnet6 method works as expected.
+TEST(RunScript, extractSubnet6) {
+    ProcessEnvVars vars;
+    Subnet6Ptr subnet6;
+    RunScriptImpl::extractSubnet6(vars, subnet6, "SUBNET6_PREFIX", "_SUBNET6_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    string expected = "SUBNET6_PREFIX_ID_SUBNET6_SUFFIX=\n"
+                      "SUBNET6_PREFIX_NAME_SUBNET6_SUFFIX=\n"
+                      "SUBNET6_PREFIX_PREFIX_SUBNET6_SUFFIX=\n"
+                      "SUBNET6_PREFIX_PREFIX_LEN_SUBNET6_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    subnet6 = generateSubnet6();
+    RunScriptImpl::extractSubnet6(vars, subnet6, "SUBNET6_PREFIX", "_SUBNET6_SUFFIX");
+    ASSERT_EQ(4, vars.size());
+    expected = "SUBNET6_PREFIX_ID_SUBNET6_SUFFIX=7\n"
+               "SUBNET6_PREFIX_NAME_SUBNET6_SUFFIX=2003:db8::1/2\n"
+               "SUBNET6_PREFIX_PREFIX_SUBNET6_SUFFIX=2003:db8::1\n"
+               "SUBNET6_PREFIX_PREFIX_LEN_SUBNET6_SUFFIX=2\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractLease4 method works as expected.
+TEST(RunScript, extractLease4) {
+    ProcessEnvVars vars;
+    Lease4Ptr lease4;
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4_PREFIX", "_LEASE4_SUFFIX");
+    ASSERT_EQ(9, vars.size());
+    string expected = "LEASE4_PREFIX_ADDRESS_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_CLTT_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_HOSTNAME_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_HWADDR_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_HWADDR_TYPE_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_STATE_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_SUBNET_ID_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_VALID_LIFETIME_LEASE4_SUFFIX=\n"
+                      "LEASE4_PREFIX_CLIENT_ID_LEASE4_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    lease4 = generateLease4();
+    RunScriptImpl::extractLease4(vars, lease4, "LEASE4_PREFIX", "_LEASE4_SUFFIX");
+    ASSERT_EQ(9, vars.size());
+    expected = "LEASE4_PREFIX_ADDRESS_LEASE4_SUFFIX=192.168.0.1\n"
+               "LEASE4_PREFIX_CLTT_LEASE4_SUFFIX=3\n"
+               "LEASE4_PREFIX_HOSTNAME_LEASE4_SUFFIX=test.hostname\n"
+               "LEASE4_PREFIX_HWADDR_LEASE4_SUFFIX=00:01:02:03\n"
+               "LEASE4_PREFIX_HWADDR_TYPE_LEASE4_SUFFIX=1\n"
+               "LEASE4_PREFIX_STATE_LEASE4_SUFFIX=default\n"
+               "LEASE4_PREFIX_SUBNET_ID_LEASE4_SUFFIX=4\n"
+               "LEASE4_PREFIX_VALID_LIFETIME_LEASE4_SUFFIX=2\n"
+               "LEASE4_PREFIX_CLIENT_ID_LEASE4_SUFFIX=00:01:02:03:04:05:06\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractLease6 method works as expected.
+TEST(RunScript, extractLease6) {
+    ProcessEnvVars vars;
+    Lease6Ptr lease6;
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6_PREFIX", "_LEASE6_SUFFIX");
+    ASSERT_EQ(13, vars.size());
+    string expected = "LEASE6_PREFIX_ADDRESS_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_CLTT_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_HOSTNAME_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_HWADDR_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_HWADDR_TYPE_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_STATE_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_SUBNET_ID_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_VALID_LIFETIME_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_DUID_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_IAID_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_PREFERRED_LIFETIME_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_PREFIX_LEN_LEASE6_SUFFIX=\n"
+                      "LEASE6_PREFIX_TYPE_LEASE6_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    lease6 = generateLease6();
+    RunScriptImpl::extractLease6(vars, lease6, "LEASE6_PREFIX", "_LEASE6_SUFFIX");
+    ASSERT_EQ(13, vars.size());
+    expected = "LEASE6_PREFIX_ADDRESS_LEASE6_SUFFIX=2003:db8::1\n"
+               "LEASE6_PREFIX_CLTT_LEASE6_SUFFIX=7\n"
+               "LEASE6_PREFIX_HOSTNAME_LEASE6_SUFFIX=test.hostname\n"
+               "LEASE6_PREFIX_HWADDR_LEASE6_SUFFIX=00:01:02:03\n"
+               "LEASE6_PREFIX_HWADDR_TYPE_LEASE6_SUFFIX=1\n"
+               "LEASE6_PREFIX_STATE_LEASE6_SUFFIX=default\n"
+               "LEASE6_PREFIX_SUBNET_ID_LEASE6_SUFFIX=5\n"
+               "LEASE6_PREFIX_VALID_LIFETIME_LEASE6_SUFFIX=4\n"
+               "LEASE6_PREFIX_DUID_LEASE6_SUFFIX=00:01:02:03:04:05:06\n"
+               "LEASE6_PREFIX_IAID_LEASE6_SUFFIX=2\n"
+               "LEASE6_PREFIX_PREFERRED_LIFETIME_LEASE6_SUFFIX=3\n"
+               "LEASE6_PREFIX_PREFIX_LEN_LEASE6_SUFFIX=128\n"
+               "LEASE6_PREFIX_TYPE_LEASE6_SUFFIX=IA_NA\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractLeases4 method works as expected.
+TEST(RunScript, extractLeases4) {
+    ProcessEnvVars vars;
+    Lease4CollectionPtr leases4;
+    RunScriptImpl::extractLeases4(vars, leases4, "LEASES4_PREFIX", "_LEASES4_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "LEASES4_PREFIX_SIZE_LEASES4_SUFFIX=0\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    leases4.reset(new Lease4Collection());
+    leases4->push_back(generateLease4());
+    leases4->push_back(generateLease4());
+    RunScriptImpl::extractLeases4(vars, leases4, "LEASES4_PREFIX", "_LEASES4_SUFFIX");
+    ASSERT_EQ(19, vars.size());
+    expected = "LEASES4_PREFIX_SIZE_LEASES4_SUFFIX=2\n"
+               "LEASES4_PREFIX_AT0_ADDRESS_LEASES4_SUFFIX=192.168.0.1\n"
+               "LEASES4_PREFIX_AT0_CLTT_LEASES4_SUFFIX=3\n"
+               "LEASES4_PREFIX_AT0_HOSTNAME_LEASES4_SUFFIX=test.hostname\n"
+               "LEASES4_PREFIX_AT0_HWADDR_LEASES4_SUFFIX=00:01:02:03\n"
+               "LEASES4_PREFIX_AT0_HWADDR_TYPE_LEASES4_SUFFIX=1\n"
+               "LEASES4_PREFIX_AT0_STATE_LEASES4_SUFFIX=default\n"
+               "LEASES4_PREFIX_AT0_SUBNET_ID_LEASES4_SUFFIX=4\n"
+               "LEASES4_PREFIX_AT0_VALID_LIFETIME_LEASES4_SUFFIX=2\n"
+               "LEASES4_PREFIX_AT0_CLIENT_ID_LEASES4_SUFFIX=00:01:02:03:04:05:06\n"
+               "LEASES4_PREFIX_AT1_ADDRESS_LEASES4_SUFFIX=192.168.0.1\n"
+               "LEASES4_PREFIX_AT1_CLTT_LEASES4_SUFFIX=3\n"
+               "LEASES4_PREFIX_AT1_HOSTNAME_LEASES4_SUFFIX=test.hostname\n"
+               "LEASES4_PREFIX_AT1_HWADDR_LEASES4_SUFFIX=00:01:02:03\n"
+               "LEASES4_PREFIX_AT1_HWADDR_TYPE_LEASES4_SUFFIX=1\n"
+               "LEASES4_PREFIX_AT1_STATE_LEASES4_SUFFIX=default\n"
+               "LEASES4_PREFIX_AT1_SUBNET_ID_LEASES4_SUFFIX=4\n"
+               "LEASES4_PREFIX_AT1_VALID_LIFETIME_LEASES4_SUFFIX=2\n"
+               "LEASES4_PREFIX_AT1_CLIENT_ID_LEASES4_SUFFIX=00:01:02:03:04:05:06\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractLeases6 method works as expected.
+TEST(RunScript, extractLeases6) {
+    ProcessEnvVars vars;
+    Lease6CollectionPtr leases6;
+    RunScriptImpl::extractLeases6(vars, leases6, "LEASES6_PREFIX", "_LEASES6_SUFFIX");
+    ASSERT_EQ(1, vars.size());
+    string expected = "LEASES6_PREFIX_SIZE_LEASES6_SUFFIX=0\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    leases6.reset(new Lease6Collection());
+    leases6->push_back(generateLease6());
+    leases6->push_back(generateLease6());
+    RunScriptImpl::extractLeases6(vars, leases6, "LEASES6_PREFIX", "_LEASES6_SUFFIX");
+    ASSERT_EQ(27, vars.size());
+    expected = "LEASES6_PREFIX_SIZE_LEASES6_SUFFIX=2\n"
+               "LEASES6_PREFIX_AT0_ADDRESS_LEASES6_SUFFIX=2003:db8::1\n"
+               "LEASES6_PREFIX_AT0_CLTT_LEASES6_SUFFIX=7\n"
+               "LEASES6_PREFIX_AT0_HOSTNAME_LEASES6_SUFFIX=test.hostname\n"
+               "LEASES6_PREFIX_AT0_HWADDR_LEASES6_SUFFIX=00:01:02:03\n"
+               "LEASES6_PREFIX_AT0_HWADDR_TYPE_LEASES6_SUFFIX=1\n"
+               "LEASES6_PREFIX_AT0_STATE_LEASES6_SUFFIX=default\n"
+               "LEASES6_PREFIX_AT0_SUBNET_ID_LEASES6_SUFFIX=5\n"
+               "LEASES6_PREFIX_AT0_VALID_LIFETIME_LEASES6_SUFFIX=4\n"
+               "LEASES6_PREFIX_AT0_DUID_LEASES6_SUFFIX=00:01:02:03:04:05:06\n"
+               "LEASES6_PREFIX_AT0_IAID_LEASES6_SUFFIX=2\n"
+               "LEASES6_PREFIX_AT0_PREFERRED_LIFETIME_LEASES6_SUFFIX=3\n"
+               "LEASES6_PREFIX_AT0_PREFIX_LEN_LEASES6_SUFFIX=128\n"
+               "LEASES6_PREFIX_AT0_TYPE_LEASES6_SUFFIX=IA_NA\n"
+               "LEASES6_PREFIX_AT1_ADDRESS_LEASES6_SUFFIX=2003:db8::1\n"
+               "LEASES6_PREFIX_AT1_CLTT_LEASES6_SUFFIX=7\n"
+               "LEASES6_PREFIX_AT1_HOSTNAME_LEASES6_SUFFIX=test.hostname\n"
+               "LEASES6_PREFIX_AT1_HWADDR_LEASES6_SUFFIX=00:01:02:03\n"
+               "LEASES6_PREFIX_AT1_HWADDR_TYPE_LEASES6_SUFFIX=1\n"
+               "LEASES6_PREFIX_AT1_STATE_LEASES6_SUFFIX=default\n"
+               "LEASES6_PREFIX_AT1_SUBNET_ID_LEASES6_SUFFIX=5\n"
+               "LEASES6_PREFIX_AT1_VALID_LIFETIME_LEASES6_SUFFIX=4\n"
+               "LEASES6_PREFIX_AT1_DUID_LEASES6_SUFFIX=00:01:02:03:04:05:06\n"
+               "LEASES6_PREFIX_AT1_IAID_LEASES6_SUFFIX=2\n"
+               "LEASES6_PREFIX_AT1_PREFERRED_LIFETIME_LEASES6_SUFFIX=3\n"
+               "LEASES6_PREFIX_AT1_PREFIX_LEN_LEASES6_SUFFIX=128\n"
+               "LEASES6_PREFIX_AT1_TYPE_LEASES6_SUFFIX=IA_NA\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractPkt4 method works as expected.
+TEST(RunScript, extractPkt4) {
+    ProcessEnvVars vars;
+    Pkt4Ptr pkt4;
+    RunScriptImpl::extractPkt4(vars, pkt4, "PKT4_PREFIX", "_PKT4_SUFFIX");
+    ASSERT_EQ(22, vars.size());
+    string expected = "PKT4_PREFIX_TYPE_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_TXID_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_LOCAL_ADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_LOCAL_PORT_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_REMOTE_ADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_REMOTE_PORT_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_IFACE_INDEX_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_IFACE_NAME_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_HOPS_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_SECS_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_FLAGS_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_CIADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_SIADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_YIADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_GIADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_RELAYED_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_HWADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_HWADDR_TYPE_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_LOCAL_HWADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_LOCAL_HWADDR_TYPE_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_REMOTE_HWADDR_PKT4_SUFFIX=\n"
+                      "PKT4_PREFIX_REMOTE_HWADDR_TYPE_PKT4_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    pkt4 = generatePkt4();
+    RunScriptImpl::extractPkt4(vars, pkt4, "PKT4_PREFIX", "_PKT4_SUFFIX");
+    ASSERT_EQ(25, vars.size());
+    expected = "PKT4_PREFIX_TYPE_PKT4_SUFFIX=UNKNOWN\n"
+               "PKT4_PREFIX_TXID_PKT4_SUFFIX=0\n"
+               "PKT4_PREFIX_LOCAL_ADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_LOCAL_PORT_PKT4_SUFFIX=67\n"
+               "PKT4_PREFIX_REMOTE_ADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_REMOTE_PORT_PKT4_SUFFIX=68\n"
+               "PKT4_PREFIX_IFACE_INDEX_PKT4_SUFFIX=2\n"
+               "PKT4_PREFIX_IFACE_NAME_PKT4_SUFFIX=eth1\n"
+               "PKT4_PREFIX_HOPS_PKT4_SUFFIX=0\n"
+               "PKT4_PREFIX_SECS_PKT4_SUFFIX=0\n"
+               "PKT4_PREFIX_FLAGS_PKT4_SUFFIX=0\n"
+               "PKT4_PREFIX_CIADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_SIADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_YIADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_GIADDR_PKT4_SUFFIX=0.0.0.0\n"
+               "PKT4_PREFIX_RELAYED_PKT4_SUFFIX=false\n"
+               "PKT4_PREFIX_HWADDR_PKT4_SUFFIX=00:01:02:03\n"
+               "PKT4_PREFIX_HWADDR_TYPE_PKT4_SUFFIX=1\n"
+               "PKT4_PREFIX_LOCAL_HWADDR_PKT4_SUFFIX=00:01:02:03\n"
+               "PKT4_PREFIX_LOCAL_HWADDR_TYPE_PKT4_SUFFIX=1\n"
+               "PKT4_PREFIX_REMOTE_HWADDR_PKT4_SUFFIX=00:01:02:03\n"
+               "PKT4_PREFIX_REMOTE_HWADDR_TYPE_PKT4_SUFFIX=1\n"
+               "PKT4_PREFIX_OPTION_82_PKT4_SUFFIX=0x0105686F776479020587F67977EF06061A2B3C4D5E6F\n"
+               "PKT4_PREFIX_OPTION_82_SUB_OPTION_1_PKT4_SUFFIX=0x686F776479\n"
+               "PKT4_PREFIX_OPTION_82_SUB_OPTION_2_PKT4_SUFFIX=0x87F67977EF\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+/// @brief Tests the extractPkt6 method works as expected.
+TEST(RunScript, extractPkt6) {
+    ProcessEnvVars vars;
+    Pkt6Ptr pkt6;
+    RunScriptImpl::extractPkt6(vars, pkt6, "PKT6_PREFIX", "_PKT6_SUFFIX");
+    ASSERT_EQ(12, vars.size());
+    string expected = "PKT6_PREFIX_TYPE_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_TXID_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_LOCAL_ADDR_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_LOCAL_PORT_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_REMOTE_ADDR_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_REMOTE_PORT_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_IFACE_INDEX_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_IFACE_NAME_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_REMOTE_HWADDR_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_REMOTE_HWADDR_TYPE_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_PROTO_PKT6_SUFFIX=\n"
+                      "PKT6_PREFIX_CLIENT_ID_PKT6_SUFFIX=\n";
+    EXPECT_EQ(expected, join(vars));
+    vars.clear();
+    pkt6 = generatePkt6();
+    RunScriptImpl::extractPkt6(vars, pkt6, "PKT6_PREFIX", "_PKT6_SUFFIX");
+    ASSERT_EQ(12, vars.size());
+    expected = "PKT6_PREFIX_TYPE_PKT6_SUFFIX=UNKNOWN\n"
+               "PKT6_PREFIX_TXID_PKT6_SUFFIX=0\n"
+               "PKT6_PREFIX_LOCAL_ADDR_PKT6_SUFFIX=ff02::1:2\n"
+               "PKT6_PREFIX_LOCAL_PORT_PKT6_SUFFIX=0\n"
+               "PKT6_PREFIX_REMOTE_ADDR_PKT6_SUFFIX=fe80::21e:8cff:fe9b:7349\n"
+               "PKT6_PREFIX_REMOTE_PORT_PKT6_SUFFIX=546\n"
+               "PKT6_PREFIX_IFACE_INDEX_PKT6_SUFFIX=2\n"
+               "PKT6_PREFIX_IFACE_NAME_PKT6_SUFFIX=eth1\n"
+               "PKT6_PREFIX_REMOTE_HWADDR_PKT6_SUFFIX=00:01:02:03\n"
+               "PKT6_PREFIX_REMOTE_HWADDR_TYPE_PKT6_SUFFIX=1\n"
+               "PKT6_PREFIX_PROTO_PKT6_SUFFIX=UDP\n"
+               "PKT6_PREFIX_CLIENT_ID_PKT6_SUFFIX=00:01:02:03:04:05:06\n";
+    EXPECT_EQ(expected, join(vars));
+}
+
+class RunScriptTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    RunScriptTest() :
+        co_manager_(new CalloutManager(1)), io_service_(new IOService()) {
+        RunScriptImpl::setIOService(io_service_);
+        clearLogFile();
+    }
+
+    /// @brief Destructor.
+    ~RunScriptTest() {
+        RunScriptImpl::setIOService(IOServicePtr());
+        clearLogFile();
+    }
+
+    /// @brief Clear the test file if it exists.
+    void clearLogFile() {
+        ::remove(TEST_LOG_FILE);
+    }
+
+    void checkScriptResult() {
+        ifstream test_log;
+        vector<string> extracted_lines;
+        time_t now(time(NULL));
+        while (true) {
+            test_log.open(TEST_LOG_FILE);
+            if (!test_log.fail()) {
+                string line;
+                while (getline(test_log, line)) {
+                    extracted_lines.push_back(line) ;
+                }
+                test_log.close();
+                break;
+            }
+            ASSERT_LT(time(NULL), now + 3) << "timeout";
+            usleep(100000);
+        }
+        ASSERT_EQ(join(extracted_lines), "SUCCESS\n");
+    }
+
+    /// @brief Fetches the callout manager instance.
+    boost::shared_ptr<CalloutManager>getCalloutManager() {
+        return (co_manager_);
+    }
+
+private:
+    /// @brief Callout manager accessed by this CalloutHandle.
+    boost::shared_ptr<CalloutManager> co_manager_;
+
+    /// @brief IOService instance to process IO.
+    isc::asiolink::IOServicePtr io_service_;
+};
+
+TEST_F(RunScriptTest, lease4Renew) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt4Ptr pkt4 = generatePkt4();
+    handle.setArgument("query4", pkt4);
+    Subnet4Ptr subnet4 = generateSubnet4();
+    handle.setArgument("subnet4", subnet4);
+    ClientIdPtr clientid = generateDUID();
+    handle.setArgument("clientid", clientid);
+    HWAddrPtr hwaddr = generateHWAddr();
+    handle.setArgument("hwaddr", hwaddr);
+    Lease4Ptr lease4 = generateLease4();
+    handle.setArgument("lease4", lease4);
+    int ret;
+    ASSERT_NO_THROW(ret = lease4_renew(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease4Expire) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Lease4Ptr lease4 = generateLease4();
+    handle.setArgument("lease4", lease4);
+    bool remove_lease = true;
+    handle.setArgument("remove_lease", remove_lease);
+    int ret;
+    ASSERT_NO_THROW(ret = lease4_expire(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease4Recover) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Lease4Ptr lease4 = generateLease4();
+    handle.setArgument("lease4", lease4);
+    int ret;
+    ASSERT_NO_THROW(ret = lease4_recover(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease4Committed) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt4Ptr pkt4 = generatePkt4();
+    handle.setArgument("query4", pkt4);
+    Lease4CollectionPtr leases4;
+    leases4.reset(new Lease4Collection());
+    leases4->push_back(Lease4Ptr());
+    leases4->push_back(generateLease4());
+    handle.setArgument("leases4", leases4);
+    Lease4CollectionPtr deleted_leases4;
+    deleted_leases4.reset(new Lease4Collection());
+    deleted_leases4->push_back(generateLease4());
+    deleted_leases4->push_back(Lease4Ptr());
+    handle.setArgument("deleted_leases4", deleted_leases4);
+    int ret;
+    ASSERT_NO_THROW(ret = leases4_committed(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease4Release) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt4Ptr pkt4 = generatePkt4();
+    handle.setArgument("query4", pkt4);
+    Lease4Ptr lease4 = generateLease4();
+    handle.setArgument("lease4", lease4);
+    int ret;
+    ASSERT_NO_THROW(ret = lease4_release(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease4Decline) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt4Ptr pkt4 = generatePkt4();
+    handle.setArgument("query4", pkt4);
+    Lease4Ptr lease4 = generateLease4();
+    handle.setArgument("lease4", lease4);
+    int ret;
+    ASSERT_NO_THROW(ret = lease4_decline(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Renew) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt6Ptr pkt6 = generatePkt6();
+    handle.setArgument("query6", pkt6);
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    Option6IAPtr option6IA = generateOptionIA();
+    handle.setArgument("ia_na", option6IA);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_renew(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Rebind) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt6Ptr pkt6 = generatePkt6();
+    handle.setArgument("query6", pkt6);
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    Option6IAPtr option6IA = generateOptionIA();
+    handle.setArgument("ia_na", option6IA);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_rebind(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Expire) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    bool remove_lease = true;
+    handle.setArgument("remove_lease", remove_lease);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_expire(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Recover) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_recover(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Committed) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt6Ptr pkt6 = generatePkt6();
+    handle.setArgument("query6", pkt6);
+    Lease6CollectionPtr leases6;
+    leases6.reset(new Lease6Collection());
+    leases6->push_back(Lease6Ptr());
+    leases6->push_back(generateLease6());
+    handle.setArgument("leases6", leases6);
+    Lease6CollectionPtr deleted_leases6;
+    deleted_leases6.reset(new Lease6Collection());
+    deleted_leases6->push_back(generateLease6());
+    deleted_leases6->push_back(Lease6Ptr());
+    handle.setArgument("deleted_leases6", deleted_leases6);
+    int ret;
+    ASSERT_NO_THROW(ret = leases6_committed(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Release) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt6Ptr pkt6 = generatePkt6();
+    handle.setArgument("query6", pkt6);
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_release(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+TEST_F(RunScriptTest, lease6Decline) {
+    impl.reset(new RunScriptImpl());
+    impl->setName(RUN_SCRIPT_TEST_SH);
+    CalloutHandle handle(getCalloutManager());
+    Pkt6Ptr pkt6 = generatePkt6();
+    handle.setArgument("query6", pkt6);
+    Lease6Ptr lease6 = generateLease6();
+    handle.setArgument("lease6", lease6);
+    int ret;
+    ASSERT_NO_THROW(ret = lease6_decline(handle));
+    EXPECT_EQ(0, ret);
+    checkScriptResult();
+}
+
+} // end of anonymous namespace
diff --git a/src/hooks/dhcp/run_script/tests/run_unittests.cc b/src/hooks/dhcp/run_script/tests/run_unittests.cc
new file mode 100644
index 0000000..1b4d40c
--- /dev/null
+++ b/src/hooks/dhcp/run_script/tests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2021 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 <log/logger_support.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/hooks/dhcp/run_script/version.cc b/src/hooks/dhcp/run_script/version.cc
new file mode 100644
index 0000000..a5b8d8c
--- /dev/null
+++ b/src/hooks/dhcp/run_script/version.cc
@@ -0,0 +1,17 @@
+// Copyright (C) 2021 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 <hooks/hooks.h>
+
+extern "C" {
+
+/// @brief returns Kea hooks version.
+int version() {
+    return (KEA_HOOKS_VERSION);
+}
+
+}