detect: add http.stat_msg sticky buffer keyword

src/detect-engine-register.h

@@ -134,6 +134,7 @@ enum {
     DETECT_HTTP_URI_RAW,
     DETECT_AL_HTTP_RAW_URI,
     DETECT_AL_HTTP_STAT_MSG,
+    DETECT_HTTP_STAT_MSG,
     DETECT_AL_HTTP_STAT_CODE,
     DETECT_AL_HTTP_USER_AGENT,
     DETECT_HTTP_UA,

src/detect-http-stat-msg.c

@@ -71,12 +71,14 @@ static int g_http_stat_msg_buffer_id = 0;
 static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
         const DetectEngineTransforms *transforms, Flow *_f,
         const uint8_t _flow_flags, void *txv, const int list_id);
+static int DetectHttpStatMsgSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
 
 /**
  * \brief Registration function for keyword: http_stat_msg
  */
 void DetectHttpStatMsgRegister (void)
 {
+    /* http_stat_msg content modifier */
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].name = "http_stat_msg";
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].desc = "content modifier to match on HTTP stat-msg-buffer";
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].url = DOC_URL DOC_VERSION "/rules/http-keywords.html#http-stat-msg";
@@ -86,6 +88,13 @@ void DetectHttpStatMsgRegister (void)
 #endif
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].flags |= SIGMATCH_NOOPT;
 
+    /* http.stat_msg sticky buffer */
+    sigmatch_table[DETECT_HTTP_STAT_MSG].name = "http.stat_msg";
+    sigmatch_table[DETECT_HTTP_STAT_MSG].desc = "sticky buffer to match on the HTTP response status message";
+    sigmatch_table[DETECT_HTTP_STAT_MSG].url = DOC_URL DOC_VERSION "/rules/http-keywords.html#http_stat-msg";
+    sigmatch_table[DETECT_HTTP_STAT_MSG].Setup = DetectHttpStatMsgSetupSticky;
+    sigmatch_table[DETECT_HTTP_STAT_MSG].flags |= SIGMATCH_NOOPT;
+
     DetectAppLayerInspectEngineRegister2("http_stat_msg", ALPROTO_HTTP,
             SIG_FLAG_TOCLIENT, HTP_RESPONSE_LINE,
             DetectEngineInspectBufferGeneric, GetData);
@@ -119,6 +128,22 @@ static int DetectHttpStatMsgSetup(DetectEngineCtx *de_ctx, Signature *s, const c
                                                   ALPROTO_HTTP);
 }
 
+/**
+ * \brief this function setup the http.stat_msg keyword used in the rule
+ *
+ * \param de_ctx   Pointer to the Detection Engine Context
+ * \param s        Pointer to the Signature to which the current keyword belongs
+ * \param str      Should hold an empty string always
+ *
+ * \retval 0       On success
+ */
+static int DetectHttpStatMsgSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
+{
+    DetectBufferSetActiveList(s, g_http_stat_msg_buffer_id);
+    s->alproto = ALPROTO_HTTP;
+    return 0;
+}
+
 static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
         const DetectEngineTransforms *transforms, Flow *_f,
         const uint8_t _flow_flags, void *txv, const int list_id)