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feat(core,host): Wake-on-LAN sender + host MAC advertisement

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Add a runtime-free Wake-on-LAN sender in punktfunk-core (per-interface subnet-directed broadcast + 255.255.255.255 on ports 9/7, repeated, optional last-known-IP unicast) exposed both as a Rust fn and a punktfunk_wake_on_lan C-ABI (ABI v3), plus a parse_mac helper. The host enumerates its wake-capable NIC MAC(s) and advertises them in a new mDNS `mac` TXT record (routed NIC first), and best-effort detects & warns (never modifies) when the NIC isn't armed for WoL.

MAC delivery is via the unauthenticated mDNS TXT rather than the connection handshake by design: a spoofed MAC only makes a wake fail (the packet is inert; the cert fingerprint still gates the connection), and it avoids threading through the hot connect path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-04 13:37:02 +02:00
parent 097cc6faf4
commit 22c0d92f2e
10 changed files with 450 additions and 5 deletions
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crates/punktfunk-core/src/lib.rs
+4 -1
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@@ -39,6 +39,7 @@ pub mod quic;
pub mod session;
pub mod stats;
pub mod transport;
pub mod wol;
pub use config::{CompositorPref, Config, FecConfig, FecScheme, Mode, ProtocolPhase, Role};
pub use error::{PunktfunkError, PunktfunkStatus, Result};
@@ -50,4 +51,6 @@ pub use stats::Stats;
///
/// v2: `punktfunk_connect` gained `client_cert_pem`/`client_key_pem` (pairing identities);
/// added `punktfunk_pair` / `punktfunk_generate_identity` / `punktfunk_connection_request_mode`.
pub const ABI_VERSION: u32 = 2;
/// v3: added `punktfunk_wake_on_lan` (Wake-on-LAN magic packet; the host's wake MAC(s) reach
/// clients out-of-band via the mDNS `mac` TXT record, so no connection is required to wake).
pub const ABI_VERSION: u32 = 3;