app-layer-parser: add stream depth

This permits to set a stream depth value for each
app-layer.

By default, the stream depth specified for tcp is set,
then it's possible to specify a own value into the app-layer
module with a proper API.

src/app-layer-parser.c

@@ -115,6 +115,9 @@ typedef struct AppLayerParserProtoCtx_
     DetectEngineState *(*GetTxDetectState)(void *tx);
     int (*SetTxDetectState)(void *alstate, void *tx, DetectEngineState *);
 
+    /* each app-layer has its own value */
+    uint32_t stream_depth;
+
     /* Indicates the direction the parser is ready to see the data
      * the first time for a flow.  Values accepted -
      * STREAM_TOSERVER, STREAM_TOCLIENT */
@@ -185,6 +188,9 @@ int AppLayerParserSetup(void)
 {
     SCEnter();
 
+    AppProto alproto = 0;
+    int flow_proto = 0;
+
     memset(&alp_ctx, 0, sizeof(alp_ctx));
 
     /* set the default tx handler if none was set explicitly */
@@ -192,6 +198,14 @@ int AppLayerParserSetup(void)
         RegisterAppLayerGetActiveTxIdFunc(AppLayerTransactionGetActiveDetectLog);
     }
 
+    /* lets set a default value for stream_depth */
+    for (flow_proto = 0; flow_proto < FLOW_PROTO_DEFAULT; flow_proto++) {
+        for (alproto = 0; alproto < ALPROTO_MAX; alproto++) {
+            alp_ctx.ctxs[flow_proto][alproto].stream_depth =
+                stream_config.reassembly_depth;
+        }
+    }
+
     SCReturnInt(0);
 }
 
@@ -1155,6 +1169,20 @@ void AppLayerParserTriggerRawStreamReassembly(Flow *f)
     SCReturn;
 }
 
+void AppLayerParserSetStreamDepth(uint8_t ipproto, AppProto alproto, uint32_t stream_depth)
+{
+    SCEnter();
+
+    alp_ctx.ctxs[FlowGetProtoMapping(ipproto)][alproto].stream_depth = stream_depth;
+
+    SCReturn;
+}
+
+uint32_t AppLayerParserGetStreamDepth(uint8_t ipproto, AppProto alproto)
+{
+    SCReturnInt(alp_ctx.ctxs[FlowGetProtoMapping(ipproto)][alproto].stream_depth);
+}
+
 /***** Cleanup *****/
 
 void AppLayerParserStateCleanup(uint8_t ipproto, AppProto alproto, void *alstate,

src/app-layer-parser.h

@@ -28,6 +28,7 @@
 #include "app-layer-events.h"
 #include "detect-engine-state.h"
 #include "util-file.h"
+#include "stream-tcp-private.h"
 
 #define APP_LAYER_PARSER_EOF                    0x01
 #define APP_LAYER_PARSER_NO_INSPECTION          0x02
@@ -149,6 +150,9 @@ void AppLayerParserRegisterDetectStateFuncs(uint8_t ipproto, AppProto alproto,
         int (*StateHasTxDetectState)(void *alstate),
         DetectEngineState *(*GetTxDetectState)(void *tx),
         int (*SetTxDetectState)(void *alstate, void *tx, DetectEngineState *));
+void AppLayerParserRegisterGetStreamDepth(uint8_t ipproto,
+                                          AppProto alproto,
+                                          uint32_t (*GetStreamDepth)(void));
 
 /***** Get and transaction functions *****/
 
@@ -205,6 +209,8 @@ int AppLayerParserProtocolIsTxEventAware(uint8_t ipproto, AppProto alproto);
 int AppLayerParserProtocolSupportsTxs(uint8_t ipproto, AppProto alproto);
 int AppLayerParserProtocolHasLogger(uint8_t ipproto, AppProto alproto);
 void AppLayerParserTriggerRawStreamReassembly(Flow *f);
+void AppLayerParserSetStreamDepth(uint8_t ipproto, AppProto alproto, uint32_t stream_depth);
+uint32_t AppLayerParserGetStreamDepth(uint8_t ipproto, AppProto alproto);
 
 /***** Cleanup *****/