Progress log — P0 (Scaffold + baseline + harness)#

See PLAN.md for the phase table and migration model.

• 2026‑06‑02 — P0a/P0b/P0c merged (scaffold + Rust‑driven baseline; bindgen full ABI + layout drift‑net; L1 differential harness ircd-testkit with the cref_* symbol‑renamed oracle archive). See docs/superpowers/plans/2026-06-01-p0{a,b,c}-*.md.
• 2026‑06‑02 — P0‑L2 (golden harness) built. New workspace crate ircd-golden boots a pristine reference‑C ircd and the in‑progress Rust‑driven ircd side‑by‑side, drives a scripted TCP client one action at a time, canonicalizes, and asserts byte‑identical wire output. First scenario — client registration (NICK/USER → welcome banner) — is byte‑identical between the two builds (alice!~alice@127.0.0.1, 16 lines through 422 MOTD File is missing). This is the real P5 gate (command handlers can't be L1‑tested). Spec/plan: docs/superpowers/plans/2026-06-02-p0-l2-golden-harness.md.
  • Reference‑C runnable binary (new): the L1 oracle only ever produced renamed objects, never a runnable C ircd. ircd-golden/build.rs now builds one: recompile only ircd.c with a native main (cbuild/ircd.o carries ‑Dmain=c_ircd_main, so it has none) into ircd_ref.o via make ‑‑eval (so the per‑object path defines $(IRCDCONF_PATH)/… expand identically), then link it with the pristine base objects (the plain .o, not the _link.o partial‑port variants) + version.o + ‑lz ‑lm ‑lcrypt. Built into OUT_DIR; path exported via cargo:rustc‑env.
  • DNS disabled project‑wide (NO_DNS_LOOKUP): s_bsd.c add_connection's async reverse‑PTR lookup (gethost_byaddr→SetDNS) both embedded a nondeterministic resolved hostname in the banner and held registration across event‑loop iterations. Now ‑DNO_DNS_LOOKUP (added to EXTRA_CFLAGS in ircd‑sys/build.rs, so cref oracle + link set + Rust binary all share it) makes the lookup a no‑op: hostp stays NULL without SetDNS, clients register immediately with their numeric host (the same end‑state a no‑PTR lookup reaches; handled at the existing !cptr->hostp paths). The USE_IAUTH cache‑hit block that derefs hostp->h_aliases is compiled out under the same flag. Per the user: resolver behaviour is intentionally not maintained.
  • Keystone finding — DO NOT pin the clock to a constant. The PLAN's "LD_PRELOAD shim overriding time()/gettimeofday() to a fixed value" breaks the server: a frozen time() freezes the global timeofday (set every loop at ircd.c:1250), so the io_loop's scheduling never advances and the listen socket is never serviced — clients are never accepted (confirmed via strace: poll() only ever watched the resolver fd). The harness uses the real clock and relies on the canonicalizer to mask the few time‑bearing tokens (242 uptime, 317 idle/signon, 391 time; 003/004 are compile‑time‑stable across both builds). The registration banner embeds no runtime timestamps, so it needs none. (A future advancing‑from‑fixed‑epoch shim could tighten WHOIS‑idle/STATS scenarios.)
  • Config path redirect (no root): CMDLINE_CONFIG is #undef → ‑f is dead; both binaries open("/usr/local/etc/ircd.conf") (s_conf.c:1395). A committed LD_PRELOAD shim (ircd-golden/csrc/l2shim.c) intercepts open/open64 and rewrites that one path to $IRCD_TEST_CONFIG. Boot flags: ‑t (foreground) ‑s (BOOT_NOIAUTH). Both bind the same fixture port (16667), so the test runs them sequentially, never concurrently.
  • Verification: cargo test ‑p ircd‑golden → registration_banner_matches_reference PASS; full cargo test green (golden + all 12 *_diff L1 suites + layout 4/4); s_bsd.c is not L1‑tested so the DNS edit breaks no differential; 0 warnings.