From 08332a4195956611db80a2cfe3710d760cbd6acf Mon Sep 17 00:00:00 2001 From: srdusr <99972264+srdusr@users.noreply.github.com> Date: Tue, 14 May 2024 01:42:00 +0200 Subject: Initial commit: wireframe packet capture/analysis tool Terminal packet capture and analysis tool built to learn the C++ memory model (byte layout, alignment, endianness, std::span over unowned buffers) via a real capture pipeline. - Hand-rolled L2-L4 decoders (Ethernet, IPv4, IPv6 with extension header walking, TCP, UDP) over std::span, no struct-casting - L7 dissector interface with DNS, HTTP, and TLS SNI implementations - pcapng read/write for Wireshark-compatible capture files - Bounded capture queue: drop-on-backpressure for live capture, blocking push for faithful file replay - Kernel-level BPF filtering (-f) and a separate display-only search (-g / interactive) that doesn't touch what's captured - Replay mode (-r) reads a saved pcapng file back through the same pipeline as live capture, no root or live device needed - pcap_stats() surfaces kernel/interface drops invisible to the capture queue's own counter - Three frontends sharing one CaptureSession setup path: CLI, TUI (FTXUI, primary), GUI (Dear ImGui + SDL3, secondary) - 89 unit tests (doctest) plus 9 libFuzzer harnesses covering every hand-rolled parser; fuzzing found and fixed a real OOM in the pcapng reader (unbounded allocation from an untrusted length field) --- fuzz/fuzz_pcapng_reader.cpp | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 fuzz/fuzz_pcapng_reader.cpp (limited to 'fuzz/fuzz_pcapng_reader.cpp') diff --git a/fuzz/fuzz_pcapng_reader.cpp b/fuzz/fuzz_pcapng_reader.cpp new file mode 100644 index 0000000..e27675b --- /dev/null +++ b/fuzz/fuzz_pcapng_reader.cpp @@ -0,0 +1,21 @@ +#include +#include +#include + +#include "wireframe/pcapng/reader.hpp" + +// Reader parses file/network data that isn't necessarily our own +// writer's output - a user could point it at any file. fmemopen() +// gives libFuzzer's byte buffer a FILE* without touching a real file. +extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { + FILE* file = fmemopen(const_cast(data), size, "rb"); + if (file == nullptr) return 0; + + wireframe::pcapng::Reader reader(file); + while (reader.next_packet()) { + // keep draining until EOF/malformed-block termination + } + + std::fclose(file); + return 0; +} -- cgit v1.2.3