detect-tls-sni: use *_Register2 API functions

Use *_Register2 API functions when registering 'tls_sni' detection
keyword.

src/detect-engine-tls.c

@@ -47,82 +47,6 @@
 #include "util-unittest-helper.h"
 #include "util-validate.h"
 
-/** \brief TLS SNI 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 PrefilterTxTlsSni(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;
-    SSLState *ssl_state = f->alstate;
-
-    if (ssl_state->client_connp.sni == NULL)
-        return;
-
-    const uint8_t *buffer = (uint8_t *)ssl_state->client_connp.sni;
-    const uint32_t buffer_len = strlen(ssl_state->client_connp.sni);
-
-    if (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 PrefilterTxTlsSniRegister(DetectEngineCtx *de_ctx,
-        SigGroupHead *sgh, MpmCtx *mpm_ctx)
-{
-    SCEnter();
-
-    return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxTlsSni,
-        ALPROTO_TLS, 0, // TODO a special 'cert ready' state might be good to add
-        mpm_ctx, NULL, "tls_sni");
-}
-
-/** \brief Do the content inspection and validation for a signature
- *
- *  \param de_ctx   Detection engine context
- *  \param det_ctx  Detection engine thread context
- *  \param s        Signature to inspect
- *  \param sm       SigMatch to inspect
- *  \param f        Flow
- *  \param flags    App layer flags
- *  \param state    App layer state
- *
- *  \retval 0       No match
- *  \retval 1       Match
- */
-int DetectEngineInspectTlsSni(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)
-{
-    uint8_t *buffer;
-    uint16_t buffer_len;
-    int cnt = 0;
-
-    SSLState *ssl_state = (SSLState *)alstate;
-
-    if (ssl_state->client_connp.sni == NULL)
-        return 0;
-
-    buffer = (uint8_t *)ssl_state->client_connp.sni;
-    buffer_len = strlen(ssl_state->client_connp.sni);
-
-    cnt = DetectEngineContentInspection(de_ctx, det_ctx, s, smd,
-            f, buffer, buffer_len, 0, DETECT_CI_FLAGS_SINGLE,
-            DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
-
-    return cnt;
-}
-
 int DetectEngineInspectTlsValidity(ThreadVars *tv,
         DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
         const Signature *s, const SigMatchData *smd,

src/detect-engine-tls.h

@@ -23,14 +23,6 @@
 #ifndef __DETECT_ENGINE_TLS_H__
 #define __DETECT_ENGINE_TLS_H__
 
-int PrefilterTxTlsSniRegister(DetectEngineCtx *de_ctx,
-        SigGroupHead *sgh, MpmCtx *mpm_ctx);
-
-int DetectEngineInspectTlsSni(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);
-
 int DetectEngineInspectTlsValidity(ThreadVars *tv,
         DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
         const Signature *s, const SigMatchData *smd,

src/detect-tls-sni.c

@@ -48,7 +48,7 @@
 
 #include "app-layer.h"
 #include "app-layer-ssl.h"
-#include "detect-engine-tls.h"
+#include "detect-engine-prefilter.h"
 #include "detect-tls-sni.h"
 
 #include "util-unittest.h"
@@ -56,6 +56,10 @@
 
 static int DetectTlsSniSetup(DetectEngineCtx *, Signature *, const char *);
 static void DetectTlsSniRegisterTests(void);
+static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
+       const DetectEngineTransforms *transforms,
+       Flow *_f, const uint8_t _flow_flags,
+       void *txv, const int list_id);
 static int g_tls_sni_buffer_id = 0;
 
 /**
@@ -73,12 +77,14 @@ void DetectTlsSniRegister(void)
 
     sigmatch_table[DETECT_AL_TLS_SNI].flags |= SIGMATCH_NOOPT;
 
-    DetectAppLayerMpmRegister("tls_sni", SIG_FLAG_TOSERVER, 2,
-            PrefilterTxTlsSniRegister);
+    DetectAppLayerInspectEngineRegister2("tls_sni", ALPROTO_TLS, SIG_FLAG_TOSERVER, 0,
+            DetectEngineInspectBufferGeneric, GetData);
 
-    DetectAppLayerInspectEngineRegister("tls_sni",
-            ALPROTO_TLS, SIG_FLAG_TOSERVER, 0,
-            DetectEngineInspectTlsSni);
+    DetectAppLayerMpmRegister2("tls_sni", SIG_FLAG_TOSERVER, 2,
+            PrefilterGenericMpmRegister, GetData, ALPROTO_TLS, 0);
+
+    DetectBufferTypeSetDescriptionByName("tls_sni",
+            "TLS Server Name Indication (SNI) extension");
 
     g_tls_sni_buffer_id = DetectBufferTypeGetByName("tls_sni");
 }
@@ -95,11 +101,35 @@ void DetectTlsSniRegister(void)
  */
 static int DetectTlsSniSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
 {
-    s->init_data->list = g_tls_sni_buffer_id;
+    DetectBufferSetActiveList(s, g_tls_sni_buffer_id);
     s->alproto = ALPROTO_TLS;
     return 0;
 }
 
+static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
+        const DetectEngineTransforms *transforms, Flow *_f,
+        const uint8_t _flow_flags, void *txv, const int list_id)
+{
+    BUG_ON(det_ctx->inspect_buffers == NULL);
+    InspectionBuffer *buffer = &det_ctx->inspect_buffers[list_id];
+
+    if (buffer->inspect == NULL) {
+        SSLState *ssl_state = (SSLState *)_f->alstate;
+
+        if (ssl_state->client_connp.sni == NULL) {
+            return NULL;
+        }
+
+        const uint32_t data_len = strlen(ssl_state->client_connp.sni);
+        const uint8_t *data = (uint8_t *)ssl_state->client_connp.sni;
+
+        InspectionBufferSetup(buffer, data, data_len);
+        InspectionBufferApplyTransforms(buffer, transforms);
+    }
+
+    return buffer;
+}
+
 #ifdef UNITTESTS
 
 /**