Autotools: move libhtp conditionals to configure

In preparation of the libhtp upgrade, move all libhtp related conditionals
to configure. This allows for one set of build scripts that works regardless
of the presence of a local libhtp dir.

Makefile.am

@@ -5,9 +5,6 @@ ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = ChangeLog COPYING LICENSE suricata.yaml.in \
              classification.config threshold.config \
              reference.config
-if BUILD_LIBHTP
- HTP_DIR = libhtp
-endif
 SUBDIRS = $(HTP_DIR) src qa rules doc contrib scripts
 
 install-data-am:

configure.ac

@@ -1072,14 +1072,30 @@ AC_INIT(configure.ac)
         AC_EGREP_HEADER(htp_config_set_path_decode_u_encoding, htp/htp.h, AC_DEFINE_UNQUOTED([HAVE_HTP_SET_PATH_DECODE_U_ENCODING],[1],[Found usable htp_config_set_path_decode_u_encoding function in libhtp]) )
     ])
 
-    # even if we are using an installed htp lib we still need to gen Makefiles inside of htp
-    AC_CONFIG_SUBDIRS([libhtp])
-    AM_CONDITIONAL([BUILD_LIBHTP], [test "x$enable_non_bundled_htp" = "xno"])
-    AS_IF([test "x$enable_non_bundled_htp" = "xno"], [
-        AC_DEFINE_UNQUOTED([HAVE_HTP_URI_NORMALIZE_HOOK],[1],[Assuming htp_config_register_request_uri_normalize function in bundled libhtp])
-        AC_DEFINE_UNQUOTED([HAVE_HTP_TX_GET_RESPONSE_HEADERS_RAW],[1],[Assuming htp_tx_get_response_headers_raw function in bundled libhtp])
-        AC_DEFINE_UNQUOTED([HAVE_HTP_DECODE_QUERY_INPLACE],[1],[Assuming htp_decode_query_inplace function in bundled libhtp])
-    ])
+    if test "x$enable_non_bundled_htp" = "xno"; then
+        # test if we have a bundled htp
+        if test -d "$srcdir/libhtp"; then
+            AC_CONFIG_SUBDIRS([libhtp])
+            HTP_DIR="libhtp"
+            AC_SUBST(HTP_DIR)
+            HTP_LDADD="../libhtp/htp/libhtp.la"
+            AC_SUBST(HTP_LDADD)
+            # make sure libhtp is added to the includes
+            CPPFLAGS="${CPPFLAGS} -I${srcdir}/../libhtp/"
+
+            AC_DEFINE_UNQUOTED([HAVE_HTP_URI_NORMALIZE_HOOK],[1],[Assuming htp_config_register_request_uri_normalize function in bundled libhtp])
+            AC_DEFINE_UNQUOTED([HAVE_HTP_TX_GET_RESPONSE_HEADERS_RAW],[1],[Assuming htp_tx_get_response_headers_raw function in bundled libhtp])
+            AC_DEFINE_UNQUOTED([HAVE_HTP_DECODE_QUERY_INPLACE],[1],[Assuming htp_decode_query_inplace function in bundled libhtp])
+        else
+            echo
+            echo "  ERROR: Libhtp is not bundled. Get libhtp from https://github.com/ironbee/libhtp"
+            echo "  and pass --enable-non-bundled-htp to Suricata's configure script."
+            echo "  Add --with-libhtp-includes=<dir> and --with-libhtp-libraries=<dir> if"
+            echo "  libhtp is not installed in the include and library paths."
+            echo
+            exit 1
+        fi
+    fi
 
 
   # enable CUDA output

src/Makefile.am

@@ -342,11 +342,7 @@ INCLUDES= $(all_includes)
 
 # the library search path.
 suricata_LDFLAGS = $(all_libraries)
-
-if BUILD_LIBHTP
-suricata_LDADD = $(top_builddir)/libhtp/htp/libhtp.la
-INCLUDES += -I$(top_srcdir)/libhtp
-endif
+suricata_LDADD = $(HTP_LDADD)
 
 # Rules to build CUDA ptx modules
 if BUILD_CUDA