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_summarize.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 fuzz/fuzz_summarize.cpp (limited to 'fuzz/fuzz_summarize.cpp') diff --git a/fuzz/fuzz_summarize.cpp b/fuzz/fuzz_summarize.cpp new file mode 100644 index 0000000..c1872fd --- /dev/null +++ b/fuzz/fuzz_summarize.cpp @@ -0,0 +1,18 @@ +#include +#include +#include + +#include "wireframe/summarize.hpp" + +// Fuzzes the full decode chain together (Ethernet/RAW -> IPv4/IPv6 -> +// TCP/UDP -> L7), not just each layer in isolation - catches bugs +// that only show up from one layer's output feeding the next (e.g. a +// span that's technically valid per-layer but wrong at the boundary). +// The first byte selects which datalink summarize_packet() should +// assume; the rest is the packet itself. +extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { + if (size < 1) return 0; + int datalink = (data[0] % 2 == 0) ? DLT_EN10MB : DLT_RAW; + wireframe::summarize_packet({data + 1, size - 1}, datalink); + return 0; +} -- cgit v1.2.3