a (incomplete) implementation of draft-sheffer-ikev2-gtc-00.txt using PAM

configure.in

@@ -401,6 +401,14 @@ AC_ARG_ENABLE(
 	fi]
 )
 
+AC_ARG_ENABLE(
+	[eap-gtc],
+	AS_HELP_STRING([--enable-eap-gtc],[build PAM based GTC authenication module for EAP (default is NO).]),
+	[if test x$enableval = xyes; then
+		eap_gtc=true
+	fi]
+)
+
 AC_ARG_ENABLE(
 	[eap-aka],
 	AS_HELP_STRING([--enable-eap-aka],[build AKA authentication module for EAP (default is NO).]),
@@ -719,6 +727,11 @@ if test x$nm = xtrue; then
 	AC_SUBST(nm_LIBS)
 fi
 
+if test x$eap_gtc = xtrue; then
+	AC_HAVE_LIBRARY([pam],[LIBS="$LIBS"],[AC_MSG_ERROR([PAM library not found])])
+	AC_CHECK_HEADER([security/pam_appl.h],,[AC_MSG_ERROR([PAM header security/pam_appl.h not found!])])
+fi
+
 dnl ======================================
 dnl  collect all plugins for libstrongswan
 dnl ======================================
@@ -820,6 +833,7 @@ AM_CONDITIONAL(USE_UNIT_TESTS, test x$unittest = xtrue)
 AM_CONDITIONAL(USE_EAP_SIM, test x$eap_sim = xtrue)
 AM_CONDITIONAL(USE_EAP_IDENTITY, test x$eap_identity = xtrue)
 AM_CONDITIONAL(USE_EAP_MD5, test x$eap_md5 = xtrue)
+AM_CONDITIONAL(USE_EAP_GTC, test x$eap_gtc = xtrue)
 AM_CONDITIONAL(USE_EAP_AKA, test x$eap_aka = xtrue)
 
 dnl other options
@@ -887,6 +901,7 @@ AC_OUTPUT(
 	src/charon/plugins/eap_aka/Makefile
 	src/charon/plugins/eap_identity/Makefile
 	src/charon/plugins/eap_md5/Makefile
+	src/charon/plugins/eap_gtc/Makefile
 	src/charon/plugins/eap_sim/Makefile
 	src/charon/plugins/smp/Makefile
 	src/charon/plugins/sql/Makefile