http: support per TX destate storage

src/app-layer-htp.c

@@ -2629,6 +2629,28 @@ static void HTPStateTruncate(void *state, uint8_t direction)
     }
 }
 
+static DetectEngineState *HTPGetTxDetectState(void *vtx)
+{
+    htp_tx_t *tx = (htp_tx_t *)vtx;
+    HtpTxUserData *tx_ud = htp_tx_get_user_data(tx);
+    return tx_ud ? tx_ud->de_state : NULL;
+}
+
+static int HTPSetTxDetectState(void *vtx, DetectEngineState *s)
+{
+    htp_tx_t *tx = (htp_tx_t *)vtx;
+    HtpTxUserData *tx_ud = htp_tx_get_user_data(tx);
+    if (tx_ud == NULL) {
+        tx_ud = HTPMalloc(sizeof(*tx_ud));
+        if (unlikely(tx_ud == NULL))
+            return -ENOMEM;
+        memset(tx_ud, 0, sizeof(*tx_ud));
+        htp_tx_set_user_data(tx, tx_ud);
+    }
+    tx_ud->de_state = s;
+    return 0;
+}
+
 static int HTPRegisterPatternsForProtocolDetection(void)
 {
     /* toserver */
@@ -2758,6 +2780,8 @@ void RegisterHTPParsers(void)
         AppLayerParserRegisterGetEventInfo(IPPROTO_TCP, ALPROTO_HTTP, HTPStateGetEventInfo);
 
         AppLayerParserRegisterTruncateFunc(IPPROTO_TCP, ALPROTO_HTTP, HTPStateTruncate);
+        AppLayerParserRegisterDetectStateFuncs(IPPROTO_TCP, ALPROTO_HTTP,
+                                               HTPGetTxDetectState, HTPSetTxDetectState);
 
         AppLayerParserRegisterParser(IPPROTO_TCP, ALPROTO_HTTP, STREAM_TOSERVER,
                                      HTPHandleRequestData);

src/app-layer-htp.h

@@ -36,6 +36,7 @@
 #include "util-radix-tree.h"
 #include "util-file.h"
 #include "app-layer-htp-mem.h"
+#include "detect-engine-state.h"
 
 #include <htp/htp.h>
 
@@ -228,6 +229,7 @@ typedef struct HtpTxUserData_ {
     uint8_t request_body_type;
     uint8_t response_body_type;
 
+    DetectEngineState *de_state;
 } HtpTxUserData;
 
 typedef struct HtpState_ {