From e700d334e0d9e52a4f37f2f6a32d44d1154a91cb Mon Sep 17 00:00:00 2001
From: "dmytro.bogovych" <dmytro.bogovych@gmail.com>
Date: Tue, 31 Mar 2020 08:52:07 +0300
Subject: [PATCH] - support loopback .pcap

---
 src/engine/helper/HL_NetworkFrame.cpp | 29 +++++++++++++++++++++++++++
 src/engine/helper/HL_NetworkFrame.h   |  1 +
 2 files changed, 30 insertions(+)

diff --git a/src/engine/helper/HL_NetworkFrame.cpp b/src/engine/helper/HL_NetworkFrame.cpp
index 6542e0f3..c7cdc1e5 100644
--- a/src/engine/helper/HL_NetworkFrame.cpp
+++ b/src/engine/helper/HL_NetworkFrame.cpp
@@ -98,6 +98,35 @@ NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForSLL(NetworkFrame::PacketD
     }
 }
 
+NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForLoopback(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
+{
+    PacketData result(packet);
+
+    if (packet.mLength < 16)
+        return PacketData();
+
+    struct LoopbackHeader
+    {
+        uint32_t mProtocolType;
+    };
+
+    const LoopbackHeader* lh = reinterpret_cast<const LoopbackHeader*>(packet.mData);
+
+    packet.mData += sizeof(LoopbackHeader);
+    packet.mLength -= sizeof(LoopbackHeader);
+
+    switch (lh->mProtocolType)
+    {
+    case AF_INET:
+        return GetUdpPayloadForIp4(packet, source, destination);
+
+    case AF_INET6:
+        return GetUdpPayloadForIp6(packet, source, destination);
+
+    default:
+        return PacketData();
+    }
+}
 
 NetworkFrame::PacketData NetworkFrame::GetUdpPayloadForIp4(NetworkFrame::PacketData& packet, InternetAddress& source, InternetAddress& destination)
 {
diff --git a/src/engine/helper/HL_NetworkFrame.h b/src/engine/helper/HL_NetworkFrame.h
index e044a753..76069931 100644
--- a/src/engine/helper/HL_NetworkFrame.h
+++ b/src/engine/helper/HL_NetworkFrame.h
@@ -25,6 +25,7 @@ public:
     static PacketData GetUdpPayloadForIp4(PacketData& packet, InternetAddress& source, InternetAddress& destination);
     static PacketData GetUdpPayloadForIp6(PacketData& packet, InternetAddress& source, InternetAddress& destination);
     static PacketData GetUdpPayloadForSLL(PacketData& packet, InternetAddress& source, InternetAddress& destination);
+    static PacketData GetUdpPayloadForLoopback(PacketData& packet, InternetAddress& source, InternetAddress& destination);
 
     struct EthernetHeader
     {