socket_t implementation withouth raw sockets

--disable-raw-socket configure option
  prevents charon/pluto to run in parallel

configure.in

@@ -306,6 +306,18 @@ AC_ARG_ENABLE(
 )
 AM_CONDITIONAL(USE_SELF_TEST, test x$self_test = xtrue)
 
+AC_ARG_ENABLE(
+    [raw-socket],
+    AS_HELP_STRING([--disable-raw-socket],[disable charons RAW socket and use a normal socket instead. Prevents charon and pluto to run in parallel. (default is NO).]),
+    [if test x$enableval = xyes; then
+        raw_socket=true
+     else
+        raw_socket=false
+    fi],
+    raw_socket=true
+)
+AM_CONDITIONAL(USE_RAW_SOCKET, test x$raw_socket = xtrue)
+
 dnl =========================
 dnl  check required programs
 dnl =========================