# dnstap.m4

# dt_DNSTAP(default_dnstap_socket_path, [action-if-true], [action-if-false])
# --------------------------------------------------------------------------
# Check for required dnstap libraries and add dnstap configure args.
AC_DEFUN([dt_DNSTAP],
[
 AC_ARG_ENABLE([dnstap],
   AS_HELP_STRING([--enable-dnstap],
                  [Enable dnstap support (requires fstrm, protobuf-c)]),
   [opt_dnstap=$enableval], [opt_dnstap=no])

 AC_ARG_WITH([dnstap-socket-path],
   AS_HELP_STRING([--with-dnstap-socket-path=pathname],
                  [set default dnstap socket path]),
   [opt_dnstap_socket_path=$withval], [opt_dnstap_socket_path="$1"])

 if test "x$opt_dnstap" != "xno"; then
   AC_PATH_PROG([PROTOC_C], [protoc-c])
   if test -z "$PROTOC_C"; then
     AC_MSG_ERROR([The protoc-c program was not found. Please install protobuf-c!])
   fi
   AC_ARG_WITH([protobuf-c], AS_HELP_STRING([--with-protobuf-c=path],
       [Path where protobuf-c is installed, for dnstap]), [
         # workaround for protobuf-c includes at old dir before protobuf-c-1.0.0
         if test -f $withval/include/google/protobuf-c/protobuf-c.h; then
           CFLAGS="$CFLAGS -I$withval/include/google"
         else
           CFLAGS="$CFLAGS -I$withval/include"
         fi
         LDFLAGS="$LDFLAGS -L$withval/lib"
       ], [
         # workaround for protobuf-c includes at old dir before protobuf-c-1.0.0
         if test -f /usr/include/google/protobuf-c/protobuf-c.h; then
           CFLAGS="$CFLAGS -I/usr/include/google"
         else
           if test -f /usr/local/include/google/protobuf-c/protobuf-c.h; then
             CFLAGS="$CFLAGS -I/usr/local/include/google"
             LDFLAGS="$LDFLAGS -L/usr/local/lib"
           fi
         fi
   ])
   AC_ARG_WITH([libfstrm], AS_HELP_STRING([--with-libfstrm=path],
       [Path where libfstrm is installed, for dnstap]), [
       CFLAGS="$CFLAGS -I$withval/include"
       LDFLAGS="$LDFLAGS -L$withval/lib"
   ])
   AC_SEARCH_LIBS([fstrm_iothr_init], [fstrm], [],
     AC_MSG_ERROR([The fstrm library was not found. Please install fstrm!]))
   AC_SEARCH_LIBS([protobuf_c_message_pack], [protobuf-c], [],
     AC_MSG_ERROR([The protobuf-c library was not found. Please install protobuf-c!]))
   $2
 else
   $3
 fi
])