tiennm99
ee3fa45469
Rust workspace with three crates: - time-mocker-core: shared MockTimeInfo + named MMF helper + FILETIME helpers - time-mocker-hook: cdylib injected into targets; inline detours via retour on GetSystemTime / GetLocalTime / GetSystemTimeAsFileTime / GetSystemTimePreciseAsFileTime / NtQuerySystemTime - time-mocker-ui: egui controller with process list, time picker, and glob/regex auto-inject rules; injects via dll-syringe; UAC manifest embedded in release builds IPC: 8-byte MMF named TimeMocker_<pid> holding an i64 delta in FILETIME ticks. Hook adds delta to the real FILETIME on every call. Note this differs from the C# version's .NET-tick delta -- contracts are not interoperable. Requires nightly toolchain (retour uses unboxed_closures / tuple_trait); pinned via rust-toolchain.toml.
TimeMocker (Rust)
A Windows tool that injects fake time into running processes by hooking Win32 time APIs. Rust port of time-mocker (C# / EasyHook).
Status: Active development. This Rust implementation is intended to become the canonical
time-mockeronce feature-complete; the C# project will be renamed to indicate its dotnet origin.
Architecture
time-mocker-rs/
├── crates/
│ ├── time-mocker-core/ — shared types (MockTimeInfo) + named MMF helper + tick conversions
│ ├── time-mocker-hook/ — cdylib injected into target processes; hooks 5 time APIs via retour
│ └── time-mocker-ui/ — egui controller binary; injects via dll-syringe, writes delta per PID
Hooked APIs
| API | DLL |
|---|---|
GetSystemTime |
kernel32 |
GetLocalTime |
kernel32 |
GetSystemTimeAsFileTime |
kernel32 |
GetSystemTimePreciseAsFileTime |
kernel32 |
NtQuerySystemTime |
ntdll |
IPC Design
Named Memory-Mapped File per injected process:
Name: TimeMocker_<PID>
Size: 8 bytes
[0..7] DeltaTicks (i64 — 100-ns units, added to the real FILETIME)
The hook reads the delta on every time API call and returns real_filetime + delta. The controller writes the delta whenever the user picks a new fake time.
Tick epoch difference vs the C# version: The C# version stores a delta against
DateTime.UtcNow.Ticks(epoch 0001-01-01 UTC). The Rust version stores a delta in raw FILETIME units (epoch 1601-01-01 UTC). The two IPC contracts are not interoperable — the Rust UI and Rust hook DLL only talk to each other.
Build
# Nightly Rust (required by retour for inline x64 detours)
# A `rust-toolchain.toml` at the repo root pins the channel automatically.
cargo build --release
# Outputs:
# target/release/time_mocker_ui.exe
# target/release/time_mocker_hook.dll (must be next to the UI exe)
Requirements
- Windows 10/11 x64
- Rust nightly (pinned via
rust-toolchain.toml) - Must run as Administrator (UAC manifest embedded)
License
MIT — see LICENSE.
Related
- time-mocker — original C# / EasyHook implementation
- time-mocker-cpp — C++ / MS Detours port