http_header: don't separately inspect trailer yet

Currently the regular 'Header' inspection code will run each time
after the HTTP progress moved beyond 'headers'. This will include
the trailers if there are any.

Leave the code in place as this model will change in the not too
distant future.

src/detect-engine-hhd.c

@@ -249,7 +249,7 @@ static void PrefilterTxHttpRequestHeaders(DetectEngineThreadCtx *det_ctx,
                 &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
     }
 }
-
+#if 0
 static void PrefilterTxHttpRequestTrailers(DetectEngineThreadCtx *det_ctx,
         const void *pectx,
         Packet *p, Flow *f, void *txv,
@@ -280,7 +280,7 @@ static void PrefilterTxHttpRequestTrailers(DetectEngineThreadCtx *det_ctx,
                 &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
     }
 }
-
+#endif
 int PrefilterTxHttpRequestHeadersRegister(SigGroupHead *sgh, MpmCtx *mpm_ctx)
 {
     SCEnter();
@@ -288,11 +288,14 @@ int PrefilterTxHttpRequestHeadersRegister(SigGroupHead *sgh, MpmCtx *mpm_ctx)
     int r = PrefilterAppendTxEngine(sgh, PrefilterTxHttpRequestHeaders,
         ALPROTO_HTTP, HTP_REQUEST_HEADERS,
         mpm_ctx, NULL, "http_header (request)");
+    return r;
+#if 0
     if (r != 0)
         return r;
     return PrefilterAppendTxEngine(sgh, PrefilterTxHttpRequestTrailers,
         ALPROTO_HTTP, HTP_REQUEST_TRAILER,
         mpm_ctx, NULL, "http_header (request)");
+#endif
 }
 
 /** \brief HTTP Headers Mpm prefilter callback
@@ -329,7 +332,7 @@ static void PrefilterTxHttpResponseHeaders(DetectEngineThreadCtx *det_ctx,
                 &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
     }
 }
-
+#if 0
 static void PrefilterTxHttpResponseTrailers(DetectEngineThreadCtx *det_ctx,
         const void *pectx,
         Packet *p, Flow *f, void *txv,
@@ -360,7 +363,7 @@ static void PrefilterTxHttpResponseTrailers(DetectEngineThreadCtx *det_ctx,
                 &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
     }
 }
-
+#endif
 int PrefilterTxHttpResponseHeadersRegister(SigGroupHead *sgh, MpmCtx *mpm_ctx)
 {
     SCEnter();
@@ -368,11 +371,14 @@ int PrefilterTxHttpResponseHeadersRegister(SigGroupHead *sgh, MpmCtx *mpm_ctx)
     int r = PrefilterAppendTxEngine(sgh, PrefilterTxHttpResponseHeaders,
         ALPROTO_HTTP, HTP_RESPONSE_HEADERS,
         mpm_ctx, NULL, "http_header (response)");
+    return r;
+#if 0
     if (r != 0)
         return r;
     return PrefilterAppendTxEngine(sgh, PrefilterTxHttpResponseTrailers,
         ALPROTO_HTTP, HTP_RESPONSE_TRAILER,
         mpm_ctx, NULL, "http_header (response)");
+#endif
 }
 
 int DetectEngineInspectHttpHeader(ThreadVars *tv,