Enable http raw response header inspection only if libhtp supports raw response header buffering which should be available post 0.2.6

configure.in

@@ -845,6 +845,11 @@ AC_CHECK_HEADER(pcap.h,,[AC_ERROR(pcap.h not found ...)])
         AC_CHECK_LIB([htp], [htp_config_register_request_uri_normalize],AC_DEFINE_UNQUOTED([HAVE_HTP_URI_NORMALIZE_HOOK],[1],[Found htp_config_register_request_uri_normalize function in libhtp]) ,,[-lhtp])
     ])
 
+    AC_CHECK_LIB([htp], [htp_tx_get_response_headers_raw],[libhtp_raw_response_header_buffer_support_enabled="yes"],[libhtp_raw_response_header_buffer_support_enabled="no"])
+    if test "$libhtp_raw_response_header_buffer_support_enabled" = "yes"; then
+    CFLAGS="${CFLAGS} -D__LIBHTP_026GT_RESPONSE_HEADER_SUPPORT__"
+    fi
+
     #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"])

src/detect-engine-hrhd.c

@@ -346,12 +346,14 @@ int DetectEngineRunHttpRawHeaderMpm(DetectEngineThreadCtx *det_ctx, Flow *f,
                                               (uint8_t *)bstr_ptr(raw_headers),
                                               bstr_len(raw_headers));
         }
+#ifdef __LIBHTP_026GT_RESPONSE_HEADER_SUPPORT__
         raw_headers = htp_tx_get_response_headers_raw(tx);
         if (raw_headers != NULL) {
             cnt += HttpRawHeaderPatternSearch(det_ctx,
                                               (uint8_t *)bstr_ptr(raw_headers),
                                               bstr_len(raw_headers));
         }
+#endif
     }
 
  end:
@@ -407,12 +409,15 @@ int DetectEngineInspectHttpRawHeader(DetectEngineCtx *de_ctx,
         if (tx == NULL)
             continue;
 
-        bstr *raw_headers;
+        bstr *raw_headers = NULL;
         if (flags & STREAM_TOSERVER) {
             raw_headers = htp_tx_get_request_headers_raw(tx);
-        } else {
+        }
+#ifdef __LIBHTP_026GT_RESPONSE_HEADER_SUPPORT__
+        else {
             raw_headers = htp_tx_get_response_headers_raw(tx);
         }
+#endif
         if (raw_headers == NULL)
             continue;