From dbe3c25d117e7b7413f13b4ece768e8236650ab6 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Mon, 29 Apr 2024 16:30:59 +0200
Subject: basic LocalMP packet dump working

---
 .gitignore                      |  2 ++
 makefile                        |  2 ++
 src/CMakeLists.txt              |  1 +
 src/frontend/qt_sdl/LocalMP.cpp | 25 +++++++++++++++++++++++++
 4 files changed, 30 insertions(+)

diff --git a/.gitignore b/.gitignore
index 0e001b7..7680a99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,5 @@ cmake-build-debug
 .vscode
 CMakeFiles
 CMakeCache.txt
+
+*.pcap
\ No newline at end of file
diff --git a/makefile b/makefile
index dcc4ceb..930e85a 100644
--- a/makefile
+++ b/makefile
@@ -9,3 +9,5 @@ build/build.ninja: CMakeLists.txt
 build/melonDS: build/build.ninja FORCE
 	@ninja -C build
 
+run: build/melonDS
+	@$<
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3dfd3b0..1f6a3e7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -178,3 +178,4 @@ endif()
 #  )
 #endif()
 
+target_link_libraries(core PRIVATE pcap)
diff --git a/src/frontend/qt_sdl/LocalMP.cpp b/src/frontend/qt_sdl/LocalMP.cpp
index 7ea9868..18d1b65 100644
--- a/src/frontend/qt_sdl/LocalMP.cpp
+++ b/src/frontend/qt_sdl/LocalMP.cpp
@@ -38,6 +38,11 @@
 #include "LocalMP.h"
 #include "Platform.h"
 
+#include <pcap/pcap.h>
+#include <time.h>
+
+pcap_dumper_t* dumper;
+
 using namespace melonDS;
 using namespace melonDS::Platform;
 
@@ -241,6 +246,11 @@ void SemReset(int num)
 
 bool Init()
 {
+    pcap_t* handle = pcap_open_dead(DLT_NULL, 1 << 16);
+    char filename[80];
+    snprintf(filename, 79, "melon_instance_%d.pcap", InstanceID);
+    dumper = pcap_dump_open(handle, filename);
+
     MPQueue = new QSharedMemory("melonNIFI");
 
     if (!MPQueue->attach())
@@ -302,6 +312,8 @@ bool Init()
 
 void DeInit()
 {
+    pcap_dump_close(dumper);
+
     if (MPQueue)
     {
         MPQueue->lock();
@@ -476,6 +488,12 @@ int SendPacketGeneric(u32 type, u8* packet, int len, u64 timestamp)
         }
     }
 
+    struct pcap_pkthdr p;
+    p.len = len;
+    p.caplen = len;
+    gettimeofday(&p.ts, NULL);
+    pcap_dump((u_char*) dumper, &p, packet);
+
     return len;
 }
 
@@ -526,6 +544,13 @@ int RecvPacketGeneric(u8* packet, bool block, u64* timestamp)
 
         if (timestamp) *timestamp = pktheader.Timestamp;
         MPQueue->unlock();
+
+        struct pcap_pkthdr p;
+        p.len = pktheader.Length;
+        p.caplen = pktheader.Length;
+        gettimeofday(&p.ts, NULL);
+        pcap_dump((u_char*) dumper, &p, packet);
+
         return pktheader.Length;
     }
 }
-- 
cgit v1.2.3