Add negotiation prologue detection helper#17
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May 22, 2026
#4716) Adds four new SEC-1 helpers in `fast_io::dir_sandbox::at_syscalls`: - `openat(dirfd, name, flags, mode) -> File` raw libc wrapper. - `openat_via_sandbox_or_fallback(...)` adaptor that takes the sandbox fast path on a single-component leaf beneath `dest_dir` and falls back to `std::fs::OpenOptions` against `link_path` with best-effort `O_*` bit translation otherwise. - `readlinkat(dirfd, name) -> PathBuf` raw libc wrapper with a growing buffer (256B -> PATH_MAX, doubling each round trip). - `readlinkat_via_sandbox_or_fallback(...)` adaptor mirroring the openat shape but falling back to `std::fs::read_link`. The helpers follow the established SEC-1 pattern: pinning the parent via the sandbox dirfd closes the TOCTOU window between path walk and the kernel reaching the inode. The `*_via_sandbox_or_fallback` adaptors keep behaviour byte-identical for callers that have not yet plumbed a `DirSandbox`, so individual call sites can be cut over one at a time. This PR adds the helpers and re-exports them through `dir_sandbox::mod` and `fast_io::lib`. It deliberately does NOT wire any caller; per-site wiring lands in follow-up PRs so each cutover gets its own diff and review. Extends the existing tests module with 10 new tests covering: - raw `openat` success and ENOENT, - `openat_via_sandbox_or_fallback` fast path, multi-component fallback, and absent-sandbox fallback, - raw `readlinkat` success and EINVAL on a non-symlink, - `readlinkat_via_sandbox_or_fallback` fast path, EINVAL, and multi-component fallback. All helpers are `#[cfg(unix)]` (the `dir_sandbox` module is itself Unix-only); Windows continues to use path-based stdlib opens per the SEC-1.l NTFS handle audit. Closes (post-wire) 16+ GAPs from the SEC-1 path-syscall coverage audit in PR #4710: #4 (readlinkat) plus the 9 direct openat sites (#9-#17) and lays foundations for #5, #20 (open + readdir-loop) and #6, #27 (recursive *at peel). Refs PR #4710.
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Summary
NegotiationPrologueclassification enum and helper to detect legacy vs binary negotiation streamsTesting
https://chatgpt.com/codex/tasks/task_e_68ef8d8abc708323a64ecc7e3758a7b1