Fix double tracing in trace_dialog().

If user AVPs are set and the trace flas is not, the code was forcing the tracing flag which was producing a duplicate of the trace. Now, the flags status (on/off) is also stored in the dialog (as var) and restore later, for each sequential request.

modules/siptrace/siptrace.c

@@ -119,6 +119,8 @@ static str toip_column        = str_init("toip");        /* 07 */
 static str fromtag_column     = str_init("fromtag");     /* 08 */
 static str direction_column   = str_init("direction");   /* 09 */
 
+static str st_flag_val = str_init("_st_XX_flag_43");
+
 static char *trace_flag_str = 0;
 int trace_flag = -1;
 int trace_on   = 0;
@@ -640,7 +642,8 @@ static void trace_transaction(struct dlg_cell* dlg, int type,
 	}while(1);
 
 	/* set the flag */
-	params->msg->flags |= trace_flag;
+	if ( dlgb.fetch_dlg_value( dlg, &st_flag_val, &avp_value.s, 0)!=0 )
+		params->msg->flags |= trace_flag;
 	params->msg->msg_flags |= FL_USE_SIPTRACE;
 	/* trace current request */
 	sip_trace(params->msg);
@@ -688,6 +691,14 @@ static int trace_dialog(struct sip_msg *msg)
 		return -1;
 	}
 
+	/* any need to do tracing here ? check the triggers */
+	avp=search_first_avp(traced_user_avp_type, traced_user_avp,
+			&avp_value, 0);
+	if (avp==NULL && (msg->flags&trace_flag)==0) {
+		LM_DBG("Nothing to trace here\n");
+		return -1;
+	}
+
 	if (dlgb.create_dlg(msg,0)<1) {
 		LM_ERR("failed to create dialog\n");
 		return -1;
@@ -709,8 +720,6 @@ static int trace_dialog(struct sip_msg *msg)
 	 them for each transactin from the dialog */
 	if(traced_user_avp>=0) {
 		n = 0;
-		avp=search_first_avp(traced_user_avp_type, traced_user_avp,
-				&avp_value, 0);
 		while(avp!=NULL) {
 			/* generate a name */
 			name = generate_val_name(n);
@@ -726,7 +735,11 @@ static int trace_dialog(struct sip_msg *msg)
 	}
 
 	/* set the flag to trace the rest of the transaction */
-	msg->flags |= trace_flag;
+	if (msg->flags&trace_flag) {
+		avp_value.s.s = "1";
+		avp_value.s.len = 1;
+		dlgb.store_dlg_value( dlg, &st_flag_val, &avp_value.s);
+	}
 
 	/* trace current request */
 	sip_trace(msg);