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SalastilandClaude Opus 5.5 5e2fd8dab8 Use original source code instead of decompiling open-source binaries

Pin the exact source of every open-source binary Steam ships:
- 6766 runtime binaries (verified by SHA-256 against their .debs) map to
  755 exact Debian/Valve source packages, plus steam-runtime-tools tags
- Valve-built bundled libraries map to upstream tags identified from version
  strings: FFmpeg 8.1.2 / 4.3.4, SDL 3.4.0, SDL_image 3.2.0, SDL_ttf 3.1.0,
  libvpx v1.10.0-78-g338013712, libaom 3.6.1, libvorbis 1.3.7, libavif 1.0.3/1.0.4
- Inferred (kept decompiled as well): dav1d 1.0.0, and ANGLE / SwiftShader /
  Vulkan-ValidationLayers / CEF via Chromium 126.0.6478.183 DEPS

SOURCES.tsv and BINARY_SOURCES.tsv record versions and evidence;
tools/sources.py fetches them into the gitignored sources/ tree.
Decompiled output for exactly-pinned binaries is removed; the proprietary
NVIDIA Cg toolkit binaries stay decompiled.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

2026-10-12 09:11:58 -04:00

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steam (Rust rewrite) — reverse-engineering workspace

Goal: a Linux-only, slimmed-down Steam client (Rust backend, Qt UI) covering only the Library: login, install/update/download, in-game presence, Steam Chat, and the steamclient.so ABI that games (native and Proton via lsteamclient) load. No Store, Community, Market, or embedded-browser features.

Layout

client/ snapshot of the official client binaries being studied (gitignored)
decomp/ generated output (tracked; logs ignored)
- <dir>_<binary>/src/<Namespace>.c, functions.tsv, strings.tsv — Ghidra pseudo-C
- protos/ — .proto files extracted from steamclient.so; descriptors.pb is a FileDescriptorSet usable directly with prost_build::Config::compile_fds
- steamui/ — prettified Library UI JS; steamclient_js_api.txt lists the SteamClient.* backend API the UI calls
- runtime/ — Steam runtime binaries: PROVENANCE.tsv matches every one by SHA-256 to its published .deb; DUPLICATES.tsv maps identical copies. Only the proprietary NVIDIA Cg toolkit binaries are decompiled here.
SOURCES.tsv — the original source code for every open-source binary, pinned to the exact version (Debian/Valve .dsc, or upstream git tag/commit) with evidence
BINARY_SOURCES.tsv — which source each binary comes from, and how that was established
sources/ — that source code, fetched by tools/sources.py fetch (gitignored, ~20 GB)

Rule: a binary whose exact source version is public is read from sources/, not decompiled. Decompiled output is kept only for code with no public source (Steam's own binaries, RAD Miles, NVIDIA Cg, Valve's WebRTC fork, ...) and for libraries whose version could only be inferred (dav1d, ANGLE, SwiftShader — see BINARY_SOURCES.tsv).

Tools

tools/decompile.sh <bin>... — headless Ghidra analysis + pseudo-C export (decompile_list.sh, decompile_batch.sh for queues/batches; limits in ghidra-env.sh)
tools/extract_protos.py <bin>... <out> — protobuf descriptor extraction
tools/verify_runtime.py — match runtime binaries to published packages
tools/sources.py resolve / fetch [--only ID] [--chromium] — pin and download sources

Re-run everything after a client update by re-copying binaries into client/.

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steam (Rust rewrite) — reverse-engineering workspace

Layout

Tools

2.3 KiB

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