detect/http_stat_msg: switch to inspect v2

src/detect-engine-hsmd.c

@@ -57,88 +57,6 @@
 #include "app-layer-protos.h"
 #include "util-validate.h"
 
-/** \brief HTTP Status Message Mpm prefilter callback
- *
- *  \param det_ctx detection engine thread ctx
- *  \param p packet to inspect
- *  \param f flow to inspect
- *  \param txv tx to inspect
- *  \param pectx inspection context
- */
-static void PrefilterTxHttpStatMsg(DetectEngineThreadCtx *det_ctx,
-        const void *pectx,
-        Packet *p, Flow *f, void *txv,
-        const uint64_t idx, const uint8_t flags)
-{
-    SCEnter();
-
-    const MpmCtx *mpm_ctx = (MpmCtx *)pectx;
-    htp_tx_t *tx = (htp_tx_t *)txv;
-
-    if (tx->response_message == NULL)
-        return;
-
-    const uint32_t buffer_len = bstr_len(tx->response_message);
-    const uint8_t *buffer = bstr_ptr(tx->response_message);
-
-    if (buffer != NULL && buffer_len >= mpm_ctx->minlen) {
-        (void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
-                &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len);
-    }
-}
-
-int PrefilterTxHttpStatMsgRegister(DetectEngineCtx *de_ctx,
-        SigGroupHead *sgh, MpmCtx *mpm_ctx)
-{
-    SCEnter();
-
-    return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxHttpStatMsg,
-        ALPROTO_HTTP,
-        HTP_RESPONSE_LINE+1, /* inspect when response line completely parsed */
-        mpm_ctx, NULL, "http_stat_msg");
-}
-
-/**
- * \brief Do the http_stat_msg content inspection for a signature.
- *
- * \param de_ctx  Detection engine context.
- * \param det_ctx Detection engine thread context.
- * \param s       Signature to inspect.
- * \param f       Flow.
- * \param flags   App layer flags.
- * \param state   App layer state.
- *
- * \retval 0 No match.
- * \retval 1 Match.
- */
-int DetectEngineInspectHttpStatMsg(ThreadVars *tv,
-        DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
-        const Signature *s, const SigMatchData *smd,
-        Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id)
-{
-    htp_tx_t *tx = (htp_tx_t *)txv;
-    if (tx->response_message == NULL) {
-        if (AppLayerParserGetStateProgress(IPPROTO_TCP, ALPROTO_HTTP, tx, flags) > HTP_RESPONSE_LINE)
-            return DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
-        else
-            return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
-    }
-
-    det_ctx->discontinue_matching = 0;
-    det_ctx->buffer_offset = 0;
-    det_ctx->inspection_recursion_counter = 0;
-    int r = DetectEngineContentInspection(de_ctx, det_ctx, s, smd,
-                                          f,
-                                          (uint8_t *)bstr_ptr(tx->response_message),
-                                          bstr_len(tx->response_message),
-                                          0, DETECT_CI_FLAGS_SINGLE,
-                                          DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
-    if (r == 1)
-        return DETECT_ENGINE_INSPECT_SIG_MATCH;
-    else
-        return DETECT_ENGINE_INSPECT_SIG_CANT_MATCH;
-}
-
 /***********************************Unittests**********************************/
 
 #ifdef UNITTESTS

src/detect-engine-hsmd.h

@@ -23,16 +23,6 @@
 #ifndef __DETECT_ENGINE_HSMD_H__
 #define __DETECT_ENGINE_HSMD_H__
 
-#include "app-layer-htp.h"
-
-int PrefilterTxHttpStatMsgRegister(DetectEngineCtx *de_ctx,
-        SigGroupHead *sgh, MpmCtx *mpm_ctx);
-
-int DetectEngineInspectHttpStatMsg(ThreadVars *tv,
-        DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
-        const Signature *s, const SigMatchData *smd,
-        Flow *f, uint8_t flags, void *alstate, void *tx, uint64_t tx_id);
-
 void DetectEngineHttpStatMsgRegisterTests(void);
 
 #endif /* __DETECT_ENGINE_HSMD_H__ */

src/detect-http-stat-msg.c

@@ -42,6 +42,7 @@
 #include "detect-content.h"
 #include "detect-pcre.h"
 #include "detect-engine-mpm.h"
+#include "detect-engine-prefilter.h"
 
 #include "flow.h"
 #include "flow-var.h"
@@ -59,13 +60,15 @@
 
 #include "app-layer-htp.h"
 #include "detect-http-stat-msg.h"
-#include "detect-engine-hsmd.h"
 #include "stream-tcp-private.h"
 #include "stream-tcp.h"
 
 static int DetectHttpStatMsgSetup(DetectEngineCtx *, Signature *, const char *);
 static void DetectHttpStatMsgRegisterTests(void);
 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);
 
 /**
  * \brief Registration function for keyword: http_stat_msg
@@ -76,15 +79,18 @@ void DetectHttpStatMsgRegister (void)
     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";
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].Setup = DetectHttpStatMsgSetup;
+#ifdef UNITTESTS
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].RegisterTests = DetectHttpStatMsgRegisterTests;
+#endif
     sigmatch_table[DETECT_AL_HTTP_STAT_MSG].flags |= SIGMATCH_NOOPT;
 
-    DetectAppLayerMpmRegister("http_stat_msg", SIG_FLAG_TOCLIENT, 3,
+    DetectAppLayerInspectEngineRegister2("http_stat_msg", ALPROTO_HTTP,
-            PrefilterTxHttpStatMsgRegister);
+            SIG_FLAG_TOCLIENT, HTP_RESPONSE_LINE,
+            DetectEngineInspectBufferGeneric, GetData);
 
-    DetectAppLayerInspectEngineRegister("http_stat_msg",
+    DetectAppLayerMpmRegister2("http_stat_msg", SIG_FLAG_TOCLIENT, 3,
-            ALPROTO_HTTP, SIG_FLAG_TOCLIENT, HTP_RESPONSE_LINE,
+            PrefilterGenericMpmRegister, GetData, ALPROTO_HTTP,
-            DetectEngineInspectHttpStatMsg);
+            HTP_RESPONSE_LINE);
 
     DetectBufferTypeSetDescriptionByName("http_stat_msg",
             "http response status message");
@@ -111,6 +117,29 @@ static int DetectHttpStatMsgSetup(DetectEngineCtx *de_ctx, Signature *s, const c
                                                   ALPROTO_HTTP);
 }
 
+static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
+        const DetectEngineTransforms *transforms, Flow *_f,
+        const uint8_t _flow_flags, void *txv, const int list_id)
+{
+    SCEnter();
+
+    InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
+    if (buffer->inspect == NULL) {
+        htp_tx_t *tx = (htp_tx_t *)txv;
+
+        if (tx->response_message == NULL)
+            return NULL;
+
+        const uint32_t data_len = bstr_len(tx->response_message);
+        const uint8_t *data = bstr_ptr(tx->response_message);
+
+        InspectionBufferSetup(buffer, data, data_len);
+        InspectionBufferApplyTransforms(buffer, transforms);
+    }
+
+    return buffer;
+}
+
 #ifdef UNITTESTS
 
 /**