Implemented a in-memory peer identity whitelist plugin

configure.in

@@ -166,6 +166,7 @@ ARG_ENABL_SET([android],        [enable Android specific plugin.])
 ARG_ENABL_SET([maemo],          [enable Maemo specific plugin.])
 ARG_ENABL_SET([nm],             [enable NetworkManager plugin.])
 ARG_ENABL_SET([ha],             [enable high availability cluster plugin.])
+ARG_ENABL_SET([whitelist],      [enable peer identity whitelisting plugin.])
 ARG_ENABL_SET([led],            [enable plugin to control LEDs on IKEv2 activity using the Linux kernel LED subsystem.])
 ARG_ENABL_SET([vstr],           [enforce using the Vstr string library to replace glibc-like printf hooks.])
 ARG_ENABL_SET([monolithic],     [build monolithic version of libstrongswan that includes all enabled plugins. Similarly, the plugins of charon are assembled in libcharon.])
@@ -774,6 +775,7 @@ ADD_PLUGIN([nm],                   [c libcharon])
 ADD_PLUGIN([dhcp],                 [c libcharon])
 ADD_PLUGIN([android],              [c libcharon])
 ADD_PLUGIN([ha],                   [c libcharon])
+ADD_PLUGIN([whitelist],            [c libcharon])
 ADD_PLUGIN([led],                  [c libcharon])
 ADD_PLUGIN([maemo],                [c libcharon])
 ADD_PLUGIN([uci],                  [c libcharon])
@@ -853,6 +855,7 @@ AM_CONDITIONAL(USE_DHCP, test x$dhcp = xtrue)
 AM_CONDITIONAL(USE_UNIT_TESTS, test x$unit_tests = xtrue)
 AM_CONDITIONAL(USE_LOAD_TESTER, test x$load_tester = xtrue)
 AM_CONDITIONAL(USE_HA, test x$ha = xtrue)
+AM_CONDITIONAL(USE_WHITELIST, test x$whitelist = xtrue)
 AM_CONDITIONAL(USE_LED, test x$led = xtrue)
 AM_CONDITIONAL(USE_EAP_SIM, test x$eap_sim = xtrue)
 AM_CONDITIONAL(USE_EAP_SIM_FILE, test x$eap_sim_file = xtrue)
@@ -1034,6 +1037,7 @@ AC_OUTPUT(
 	src/libcharon/plugins/addrblock/Makefile
 	src/libcharon/plugins/uci/Makefile
 	src/libcharon/plugins/ha/Makefile
+	src/libcharon/plugins/whitelist/Makefile
 	src/libcharon/plugins/led/Makefile
 	src/libcharon/plugins/android/Makefile
 	src/libcharon/plugins/maemo/Makefile