From d459d0b352ed8b33ebf51d8a4abd00d33d4e7a03 Mon Sep 17 00:00:00 2001
From: Victor Julien <victor@inliniac.net>
Date: Fri, 7 Jul 2017 11:14:04 +0200
Subject: [PATCH] lua/alert: expose transaction if available

Bug #1748.
---
 src/output-lua.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/output-lua.c b/src/output-lua.c
index 16f599aaf5..55e9110570 100644
--- a/src/output-lua.c
+++ b/src/output-lua.c
@@ -213,8 +213,13 @@ static int LuaPacketLoggerAlerts(ThreadVars *tv, void *thread_data, const Packet
 
         lua_getglobal(td->lua_ctx->luastate, "log");
 
+        void *txptr = NULL;
+        if (p->flow && p->flow->alstate && (pa->flags & PACKET_ALERT_FLAG_TX))
+            txptr = AppLayerParserGetTx(p->proto, p->flow->alproto, p->flow->alstate, pa->tx_id);
+
         LuaStateSetThreadVars(td->lua_ctx->luastate, tv);
         LuaStateSetPacket(td->lua_ctx->luastate, (Packet *)p);
+        LuaStateSetTX(td->lua_ctx->luastate, txptr);
         LuaStateSetFlow(td->lua_ctx->luastate, p->flow);
         LuaStateSetPacketAlert(td->lua_ctx->luastate, (PacketAlert *)pa);