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A single-binary, Flutter-free remote-support agent that speaks the stock
RustDesk wire protocol. Designed for one-line MDM deployment against a
self-hosted rustdesk-server: a supporter using the unmodified rustdesk.exe
client connects, the controlled-side user gets a native Win32 approval
prompt, click Yes / No.
CLI surface
hello-agent.exe --install # register + start service
hello-agent.exe --uninstall # stop, delete, clean up
hello-agent.exe --config <BLOB> # admin-UI deploy string
hello-agent.exe --install --config <BLOB> # MDM one-liner
--config accepts both forms emitted by the rustdesk-server admin UI: the
reversed-base64 deploy string and the host=,key=,api=,relay= filename
form. Decoded via the upstream custom_server module, persisted via
hbb_common::config::Config::set_option.
Architecture
--service runs as a Session 0 LocalSystem service. It polls
WTSGetActiveConsoleSessionId and (re)spawns hello-agent.exe --server
into the active console session via librustdesk::platform::run_as_user,
handling the Session 0 → user-session token impersonation.
--server is the worker. It boots three concurrent components:
1. cm_popup: an IPC listener on the rustdesk `_cm` named pipe
2. librustdesk::start_server(true, false): the upstream protocol
stack — rendezvous mediator, NAT punch, IPC server, screen
capture, login validation, hbbs_http heartbeat / sysinfo sync
3. (implicit) ApproveMode::Click is pinned in config, so every
incoming connection routes through cm_popup
The popup mechanism reuses an existing upstream contract without any
patches to the protocol code: when a peer connects with no password,
Connection::start in the upstream code calls try_start_cm_ipc, which
ipc::connect-s the `_cm` pipe before falling back to spawning a Flutter
CM child. Since cm_popup is up first, step 1 succeeds; we read the
Data::Login{authorized:false} frame, show MessageBoxTimeoutW (Yes/No,
60s, top-most, system-modal), and reply Data::Authorize or Data::Close.
Source tree
src/main.rs CLI dispatcher + run_server() composition
src/cli.rs hand-rolled argv parser + unit tests
src/service.rs windows-service install/uninstall/dispatcher
src/config_import.rs --config blob decoding + persistence
src/cm_popup.rs _cm IPC listener + Win32 approval dialog
Vendoring
The upstream RustDesk crate is vendored under vendor/rustdesk/ — full
workspace including libs/{hbb_common, scrap, enigo, clipboard,
virtual_display, remote_printer}. This makes the build self-contained
(no submodules, no sibling-repo checkout in CI) and gives us freedom to
fork in a different direction later. Excluded from the vendor: .git,
target/, flutter/, appimage/, flatpak/, fastlane/, docs/, examples/,
ci/, build.py, Dockerfile, upstream README/CLAUDE/AGENTS/GEMINI.
One local divergence vs. upstream: vendor/rustdesk/src/lib.rs flips
`mod custom_server` → `pub mod custom_server` so config_import.rs can
call get_custom_server_from_string without going through the
ui_interface shim. Documented in README.md → "Re-syncing the vendored
copy".
CI
.gitea/workflows/build-windows.yml builds on a self-hosted Windows
runner with Rust 1.75, LLVM 15.0.6 (libclang for bindgen via libvpx-sys),
and a vcpkg cache. The vendored vcpkg.json drives x64-windows-static
deps. The workflow stages the resulting hello-agent.exe into
SignOutput\, reports authenticode signing status (warns on unsigned),
and uploads as artifact. ~15 min full build, faster on incremental.
Out of scope for this commit: Linux/macOS builds, code signing, MSI
packaging, coexistence with stock rustdesk on the same box (currently
shares the RustDesk APP_NAME and config dir).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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69 lines
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[package]
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name = "scrap"
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description = "Screen capture made easy."
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version = "0.5.0"
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repository = "https://github.com/quadrupleslap/scrap"
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documentation = "https://docs.rs/scrap"
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keywords = ["screen", "capture", "record"]
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license = "MIT"
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authors = ["Ram <quadrupleslap@gmail.com>"]
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edition = "2018"
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[features]
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wayland = ["gstreamer", "gstreamer-app", "gstreamer-video", "dbus", "tracing", "zbus"]
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mediacodec = ["ndk"]
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linux-pkg-config = ["dep:pkg-config"]
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hwcodec = ["dep:hwcodec"]
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vram = ["hwcodec/vram"]
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[dependencies]
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cfg-if = "1.0"
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num_cpus = "1.15"
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lazy_static = "1.4"
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hbb_common = { path = "../hbb_common" }
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webm = { git = "https://github.com/rustdesk-org/rust-webm" }
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serde = {version="1.0", features=["derive"]}
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[dependencies.winapi]
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version = "0.3"
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default-features = true
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features = ["dxgi", "dxgi1_2", "dxgi1_5", "d3d11", "winuser", "winerror", "errhandlingapi", "libloaderapi"]
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[target.'cfg(target_os = "macos")'.dependencies]
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block = "0.1"
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[target.'cfg(target_os = "android")'.dependencies]
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android_logger = "0.13"
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jni = "0.21"
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lazy_static = "1.4"
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log = "0.4"
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serde_json = "1.0"
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ndk = { version = "0.7", features = ["media"], optional = true}
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ndk-context = "0.1"
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[target.'cfg(not(target_os = "android"))'.dev-dependencies]
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repng = "0.2"
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docopt = "1.1"
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quest = "0.3"
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[build-dependencies]
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target_build_utils = "0.3"
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bindgen = "0.65"
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pkg-config = { version = "0.3.27", optional = true }
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[target.'cfg(target_os = "linux")'.dependencies]
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dbus = { version = "0.9", optional = true }
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tracing = { version = "0.1", optional = true }
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gstreamer = { version = "0.16", optional = true }
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gstreamer-app = { version = "0.16", features = ["v1_10"], optional = true }
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gstreamer-video = { version = "0.16", optional = true }
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zbus = { version = "3.15", optional = true }
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[dependencies.hwcodec]
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git = "https://github.com/rustdesk-org/hwcodec"
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optional = true
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[target.'cfg(any(target_os = "windows", target_os = "linux"))'.dependencies]
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nokhwa = { git = "https://github.com/rustdesk-org/nokhwa.git", branch = "fix_from_raw_parts", features = ["input-native"] }
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