Running the Linux build against a live game showed it stuck forever on
"scanning signatures": scanMaps only collected mappings whose file matched
eldenring.exe, but this Proton build backs just the 4 KB PE header with the
real path and maps the rest of the module (~94 MB of .text/.rdata/.data,
where every AOB signature lives) as one anonymous mapping with no path.
findModuleBase was handing the scanner the header alone.
moduleSpan (the matching logic, now pulled out of scanMaps as a pure
function for process_linux_test.go) extends the span through contiguous
anonymous mappings that follow the last named one, and stops at the first
mapping with its own path so it can't merge in an unrelated module.
Confirmed against the live process: all three signatures resolve, PlayerIns
confirms, and /deaths reports real numbers end to end.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
process.go's boundary functions (readMemory, findModuleBase,
productVersion, findProcessID, openProcess, closeProcessHandle) become
swappable package variables, same pattern as testExeDir in totals.go.
process_test.go builds a fakeProcess (an in-memory buffer addressed
like real process memory) to exercise signature scanning, scanModule's
chunk-overlap logic, PlayerIns confirmation by memory read (the path
Linux always takes), the save-slot read, the double-read name
confirmation rule, and rejection of raw-pointer-as-UTF16 garbage.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Elden Ring under Proton on Linux is the same Windows binary, so every
AOB signature and memory offset is unchanged — only how the process
gets found and read differs. Split main.go/i18n.go (previously
Windows-only) into a portable process.go (signature scanning, pointer
resolution, the poll loop) plus process_windows.go/process_linux.go
behind a small boundary: findProcessID, openProcess,
closeProcessHandle, readMemory, findModuleBase, productVersion,
systemLang.
Linux side: finds the process by walking /proc/*/maps for a mapping
ending in eldenring.exe (Proton runs several helper processes, so
matching by name alone isn't reliable), reads memory via
/proc/<pid>/mem (stdlib only, no external deps), and has no
productVersion equivalent (returns ok=false — this was always just a
hint for which PlayerIns offset to try first; the real one is
confirmed by a live memory read regardless). openProcess probes
/proc/<pid>/mem up front so a ptrace_scope permission failure surfaces
immediately with the exact `sudo setcap cap_sys_ptrace+ep <path>` fix,
never suggesting the system-wide ptrace_scope=0 weakening or running
as root.
main.go and i18n.go are fully portable now, no build tags. Verified:
Windows build/vet/test plus a real run (no regression from moving
~500 lines). Linux is cross-compile build/vet only in this session —
not yet run against a real Proton process.
The co-op link was authenticated (HMAC token, never sent over the wire)
but not encrypted. The hub now generates a self-signed cert on first run;
the peer pins its exact fingerprint (no CA involved — there isn't one for
a Tailscale/LAN address), delivered via a single invite-code paste that
also carries the token, replacing today's separate IP+token copy.
The peer link moves to its own TLS-only port (peer_listen, 47823) so the
plain overlay/panel port (47822, OBS-facing) never needs to be exposed
alongside it — today, opening the overlay port to a remote partner also
exposes /deaths and the panel to anyone.
Mandatory pinning, no insecure fallback: a half-configured peer (some but
not all of hub/token/fingerprint, or a broken invite) fails loudly at
startup rather than connecting unpinned. An unconfigured peer still runs
fine as a local-only overlay, same as before.
New: tlscert.go (cert generation/persistence), pin.go (fingerprint
pinning), invite.go (invite-code encode/decode, host auto-detection),
each with tests. main.go/config.go/duo.go/ws.go carry the wiring for
this — the dual listener, new config keys, and the TLS-aware WebSocket
dial — and were rewritten in English in the process, per the project's
new English-only code convention (see CLAUDE.md).
Reads the game's process memory read-only (AOB signature scanning,
re-resolved every tick — never a cached pointer) and serves a live
death counter as a browser-source overlay plus a status panel.
Supports co-op: each player runs the program locally, one acts as
hub. The peer link is authenticated (HMAC challenge/response, no
token on the wire, constant-time compare) but not yet encrypted —
see CLAUDE.md's TODO section for the planned TLS+pinning split.
Zero external dependencies — including a hand-rolled WebSocket
implementation — so the whole thing ships as one .exe.
emmatherock