Initial commit: hello-agent — headless RustDesk-protocol-compatible Windows agent

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>

vendor/rustdesk/libs/clipboard/Cargo.toml

@@ -0,0 +1,57 @@
+[package]
+name = "clipboard"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+cc = "1.0"
+
+[features]
+default = []
+unix-file-copy-paste = [
+"dep:x11rb",
+"dep:x11-clipboard",
+"dep:rand",
+"dep:fuser",
+"dep:libc",
+"dep:dashmap",
+"dep:percent-encoding",
+"dep:utf16string",
+"dep:once_cell",
+"dep:cacao"
+]
+
+[dependencies]
+thiserror = "1.0"
+lazy_static = "1.4"
+serde = "1.0"
+serde_derive = "1.0"
+hbb_common = { path = "../hbb_common" }
+parking_lot = {version = "0.12"}
+
+[target.'cfg(any(target_os = "linux", target_os = "macos"))'.dependencies]
+rand = {version = "0.8", optional = true}
+libc = {version = "0.2", optional = true}
+dashmap = {version ="5.5", optional = true}
+utf16string = {version = "0.2", optional = true}
+once_cell = {version = "1.18", optional = true}
+
+[target.'cfg(target_os = "linux")'.dependencies]
+percent-encoding = {version  ="2.3", optional = true}
+x11-clipboard = {git="https://github.com/clslaid/x11-clipboard", branch = "feat/store-batch", optional = true}
+x11rb =  {version = "0.12", features = ["all-extensions"], optional = true}
+fuser = {version = "0.15", default-features = false, optional = true}
+
+[target.'cfg(target_os = "macos")'.dependencies]
+cacao = {git="https://github.com/clslaid/cacao", branch = "feat/set-file-urls", optional = true}
+# Use `relax-void-encoding`, as that allows us to pass `c_void` instead of implementing `Encode` correctly for `&CGImageRef`
+objc2 = { version = "0.5.1", features = ["relax-void-encoding"] }
+objc2-foundation = { version = "0.2.0", features = ["NSArray", "NSString", "NSEnumerator", "NSGeometry", "NSProgress"] }
+objc2-app-kit = { version = "0.2.0", features = ["NSPasteboard", "NSPasteboardItem", "NSImage", "NSFilePromiseProvider"] }
+uuid = { version = "1.3", features = ["v4"] }
+fsevent = "2.1.2"
+dirs = "5.0"
+xattr = "1.4.0"