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"b97154e67e32c85465826e8bcc1c59429aaaf107c1e4a9e53c8d8ccd5eff88d0" + +[[package]] +name = "zmij" +version = "1.0.19" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "3ff05f8caa9038894637571ae6b9e29466c1f4f829d26c9b28f869a29cbe3445" diff --git a/lanshare/Cargo.toml b/lanshare/Cargo.toml new file mode 100644 index 0000000..eb23861 --- /dev/null +++ b/lanshare/Cargo.toml @@ -0,0 +1,19 @@ +[package] +name = "lanshare" +version = "0.1.0" +edition = "2021" + +[dependencies] +axum = { version = "0.8", features = ["ws"] } +axum-server = { version = "0.8.0", features = ["tls-rustls"] } +tokio = { version = "1", features = ["full"] } +tower-http = { version = "0.6", features = ["fs", "cors"] } +serde = { version = "1", features = ["derive"] } +serde_json = "1" +uuid = { version = "1", features = ["v4"] } +tracing = "0.1" +tracing-subscriber = { version = "0.3", features = ["env-filter"] } +futures = "0.3" +dashmap = "6" +clap = { version = "4", features = ["derive"] } +local-ip-address = "0.6" diff --git a/lanshare/README.md b/lanshare/README.md new file mode 100644 index 0000000..92cf147 --- /dev/null +++ b/lanshare/README.md @@ -0,0 +1,149 @@ +# LAN Share + +A peer-to-peer screen sharing application for local networks. No accounts, no cloud services — just open a browser and share. + +## Features + +- **WebRTC P2P**: Direct peer-to-peer connections, video never touches the server +- **Audio support**: Optionally share system audio with your screen +- **Multiple streams**: View multiple shared screens, select which one to focus on +- **Zero config**: Just run the server and open the URL in any browser +- **Keyboard shortcuts**: `F` for fullscreen, `M` for mute, `Escape` to expand sidebar + +## Building + +```bash +cargo build --release +``` + +The binary will be at `target/release/lanshare`. + +## Running + +```bash +./target/release/lanshare +``` + +Or with cargo: + +```bash +cargo run --release +``` + +The server starts on `http://0.0.0.0:8080` by default. + +### CLI Options + +``` +Usage: lanshare [OPTIONS] + +Options: + -H, --host IP address to bind to [default: 0.0.0.0] + -p, --port Port to listen on [default: 8080] + -v, --verbose Enable verbose/debug logging + -q, --quiet Quiet mode - only show errors + -h, --help Print help + -V, --version Print version +``` + +Examples: + +```bash +# Listen on a specific interface +lanshare --host 192.168.1.100 --port 3000 + +# Localhost only (for testing) +lanshare -H 127.0.0.1 + +# Quiet mode +lanshare -q +``` + +### CLI Options + +``` +LAN Share - Peer-to-peer screen sharing for local networks + +Usage: lanshare [OPTIONS] + +Options: + -H, --host Host address to bind to [default: 0.0.0.0] + -p, --port Port to listen on [default: 8080] + -v, --verbose Enable verbose logging + -h, --help Print help + -V, --version Print version +``` + +### Examples + +```bash +# Run on default settings (0.0.0.0:8080) +lanshare + +# Run on a specific port +lanshare -p 3000 + +# Bind to localhost only +lanshare -H 127.0.0.1 -p 8080 + +# Run with verbose logging +lanshare -v +``` + +## Usage + +1. Start the server on any machine in your LAN +2. Open `http://:8080` in a browser on each device +3. Enter your name when prompted +4. Click "Start Sharing" to share your screen +5. Select shared screens from the sidebar to view them + +## Architecture + +``` +┌─────────────────────────────────────────────────────────────┐ +│ Signaling Server │ +│ (Rust/Axum/WebSocket) │ +│ - Peer discovery │ +│ - Relays SDP offers/answers │ +│ - Relays ICE candidates │ +└─────────────────────────────────────────────────────────────┘ + │ │ + │ WebSocket │ WebSocket + │ (signaling only) │ (signaling only) + ▼ ▼ + ┌─────────────┐ ┌─────────────┐ + │ Peer A │◄────────────────────►│ Peer B │ + │ (Browser) │ WebRTC P2P │ (Browser) │ + └─────────────┘ (video/audio) └─────────────┘ +``` + +The server only handles signaling — the actual video/audio streams flow directly between browsers via WebRTC. + +## Browser Support + +Tested on: +- Chrome/Chromium +- Firefox +- Edge +- Safari (macOS) + +Note: Screen sharing with audio requires Chrome/Edge on Windows/macOS. Firefox and Linux may have limited audio capture support depending on the system. + +## Configuration + +Command-line options take precedence over defaults. See `lanshare --help` for all options. + +Environment variables: +- `RUST_LOG`: Override log level (e.g., `RUST_LOG=lanshare=debug`) + +## Security Notes + +- This is designed for **trusted local networks only** +- No authentication — anyone with the URL can join +- No encryption beyond what WebRTC provides by default (DTLS-SRTP) +- Don't expose to the internet without additional security measures + +## License + +MIT diff --git a/lanshare/lanshare.crt b/lanshare/lanshare.crt new file mode 100644 index 0000000..f2089d7 --- /dev/null +++ b/lanshare/lanshare.crt @@ -0,0 +1,21 @@ +-----BEGIN CERTIFICATE----- +MIIDazCCAlOgAwIBAgIUQ9Xl2Hpk/6TLpoSPt9ZoOfJY7JwwDQYJKoZIhvcNAQEL +BQAwRTELMAkGA1UEBhMCRlIxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM +GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yNjAyMDQxMTE2MzhaFw0yNjAy +MTQxMTE2MzhaMEUxCzAJBgNVBAYTAkZSMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw +HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQwggEiMA0GCSqGSIb3DQEB +AQUAA4IBDwAwggEKAoIBAQCkgmUClyKPdgGGVeDjEAxBKxoB0foStA95lxh8pt7U +8k2hSbWc0kOlNqt0BgQjGPfQ7LPCc1hQwOv/7jz3zcC9xTi8uKRN5Q7sCqSFdQsa +jxbriWVXjDdCt+6L5ZKCQLQ3THZ1nIB6uq8j6Mal2MMwQjs5nhGYFRpfvMVcs4MR +KNHxe6rAWoUk5RYmefAdJjCLafruqO39HMgcGorPqkly12/v+d5G46gsgvkiXHCU +7qYa8MKC9YB4Oli4tp+2EFAna90ZEYXqImeBMHJnirNpsh0dgaqgBvfZif+B0FDe +anW6cSOcuWsX6zcP37DV3R/p7SDLY5GymMFE8m7HQ1+/AgMBAAGjUzBRMB0GA1Ud +DgQWBBRRv2p+x2aP66r8Mwh0syVEaB4MMzAfBgNVHSMEGDAWgBRRv2p+x2aP66r8 +Mwh0syVEaB4MMzAPBgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBCwUAA4IBAQAP +FYKgAEZtcHGZcefsQ5Vm3uYgMESe6wBdK6vE/fbbxIn9tzD05Yy7ZBJ0zQjhhYO0 +WqRH21gWqQZn6x6sF+wjgIgqoKAOOZbZuQ1xHJtxXysbGioPKcg79+TH9Rgf64yG +SGPFsmy2rJx77FtQV6tUnusRMaz644zWuK6/rd580bpffdsLcY+3q6I8GvYmEDEh +zKb3tDEgwRDOs+gYm0vZLg7b9sy7O1Dd/FGZkqtMdkOGqbrz+5GpUViBknMZTlFb +PE/mEJmCxBZ0bpuSN+bJvIC3yFyQSbt/4xZs5p8qBr8bO7KD0c+wCMsqEGnmF2QI +ggMhQ8WnrzETpxZvFwXu +-----END CERTIFICATE----- diff --git a/lanshare/lanshare.key b/lanshare/lanshare.key new file mode 100644 index 0000000..3548a67 --- /dev/null +++ b/lanshare/lanshare.key @@ -0,0 +1,28 @@ +-----BEGIN PRIVATE KEY----- +MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCkgmUClyKPdgGG +VeDjEAxBKxoB0foStA95lxh8pt7U8k2hSbWc0kOlNqt0BgQjGPfQ7LPCc1hQwOv/ +7jz3zcC9xTi8uKRN5Q7sCqSFdQsajxbriWVXjDdCt+6L5ZKCQLQ3THZ1nIB6uq8j +6Mal2MMwQjs5nhGYFRpfvMVcs4MRKNHxe6rAWoUk5RYmefAdJjCLafruqO39HMgc +GorPqkly12/v+d5G46gsgvkiXHCU7qYa8MKC9YB4Oli4tp+2EFAna90ZEYXqImeB +MHJnirNpsh0dgaqgBvfZif+B0FDeanW6cSOcuWsX6zcP37DV3R/p7SDLY5GymMFE +8m7HQ1+/AgMBAAECggEALX/bDCJc7qzGsy7haiuwF/4hzUsUDUQ723dM0H0euGrj +ya4nSt5k0zcRqJ9ZWZO4RtKQzUE1tfAF1d1Ag5Ems9XuYVP4LYsi22n+IuNCVPAq +eK6hltszFYLluU+fe+MFdR3yzYihiFBFzHq/JnOTWK+YzdDIMPX1O3FsbL1BjOb5 +1I8gmaCEKk4HfVDHQNqE7bfIrLmTt1RsM6jzeOaVKGWzAmpVsg5fLRVQt3zIRwB1 +sCm9UKKMN7IDNq/f3gjPGcOHr6ONPOYwK/NqqFqoXlYSOJLod+HRUMsim4+sMQ41 +t8o4tffztU8zStoI0zBO/4UVBKdDeCceNhXweGOXMQKBgQDOmSNoxpexlaKAjyeA +9krXosM0MxasPkGWNWYa5zfFLZeVgfQyivhfA/7Is4ATmaI3owFv3XhvbvogkwGF +FaReR3b5Rm34+4eM4mH3Ot83WWroDGM9uZF5L5R3aJPtVZRFerKgn3b1zndneqS1 +rvFMy+o9d3586NVgSkgZ/Gx31QKBgQDL2MwcAFrhpKPectoJ5Hrxv5lTR/tw/U7J +gAo8E84l8N1H0+OajfXyFNJLUAW/eyH+xa2LKa9j4Vz9aZjgsaSByKTnKuuuJNGG +Rg+qfbDtEI3t4EOrCCc8BXGgv4U2W5RrUBmScARDcSBOGWgCyiSZEpk1nTgnL1u8 +ibucQHx3QwKBgQC/kU49HFCSkT6SWKt3sGjrlHfO0kSGyF+GidM4xQd4pXL2Zf7q +UuRFLm406gSrp/y7/EEb2k+PfGcgh0+UeOHlrfyK3hyhD5K8NzpBxewu5ZH0w2/O +T2Ct70mKg4UPQBhxaHlz6QmkmaMsZ5ONCD+lRzvXbRLzfe5FD/vVZLOrVQKBgQCi +N5dOHTY1ZGiHaEx9HNZ9tSRVsu20X9An5/29C2G8ra3aMBNq9den2svy5O5+D4Xh +EfxlxzlsuXXfr/3ZqWQpZ7tavrwoq+IVAYIMAdQfA1J+3z3aSDW4vPhMnLxsono8 +39RJxVyPMuIrZGpx9d0j9zn3AXMjM7vEELM8x9CEswKBgDQJcTnQs+zJoLWHmxSl +qe7Zc3P3FmwT5jU2Yr/4ZfSSAIJezqI3PnQOsmx7pvo1DdI9nEZVF/s1U6eC9UwH +uEcuyyNwdydycejehQi6TwRU+XB6ZrHScDhkAYGvjGvv4O48D/lylqK2aYqm9h4m +sJLbJJfG4l1DQYsCs/S8qBDA +-----END PRIVATE KEY----- diff --git a/lanshare/src/main.rs b/lanshare/src/main.rs new file mode 100644 index 0000000..270521b --- /dev/null +++ b/lanshare/src/main.rs @@ -0,0 +1,406 @@ +use axum::{ + extract::{ + ws::{Message, WebSocket, WebSocketUpgrade}, + State, + }, + response::{Html, IntoResponse}, + routing::get, + Router, +}; +use clap::Parser; +use dashmap::DashMap; +use futures::{SinkExt, StreamExt}; +use serde::{Deserialize, Serialize}; +use std::{net::SocketAddr, path::PathBuf, sync::Arc}; +use tokio::sync::broadcast; +use tower_http::cors::CorsLayer; +use tracing::{info, warn}; +use uuid::Uuid; +use axum_server::tls_rustls::RustlsConfig; + +/// LAN Share - Peer-to-peer screen sharing for local networks +/// +/// A lightweight WebRTC-based screen sharing application that runs entirely +/// on your local network. No accounts, no cloud services — just open a +/// browser and share. +/// +/// The server only handles signaling (peer discovery, connection setup). +/// Video/audio streams flow directly between browsers via WebRTC P2P. +#[derive(Parser, Debug)] +#[command(name = "lanshare")] +#[command(version, about, long_about = None)] +struct Args { + /// IP address to bind to + /// + /// Use 0.0.0.0 to listen on all network interfaces (default), + /// 127.0.0.1 for localhost only, or a specific IP address. + #[arg(short = 'H', long, default_value = "0.0.0.0", value_name = "IP")] + host: String, + + /// Port to listen on + #[arg(short, long, default_value_t = 8080, value_name = "PORT")] + port: u16, + + /// Enable verbose/debug logging + #[arg(short, long)] + verbose: bool, + + /// Quiet mode - only show errors + #[arg(short, long, conflicts_with = "verbose")] + quiet: bool, + + #[arg(short, long)] + certificate: PathBuf, + + #[arg(short, long)] + key: PathBuf, +} + +/// Messages sent between peers via the signaling server +#[derive(Debug, Clone, Serialize, Deserialize)] +#[serde(tag = "type", rename_all = "snake_case")] +enum SignalMessage { + /// Server assigns an ID to a new peer + Welcome { + peer_id: String, + peers: Vec, + }, + /// Peer announces themselves (with optional name) + Announce { + name: String, + }, + /// Broadcast: a peer joined + PeerJoined { + peer_id: String, + name: String, + }, + /// Broadcast: a peer left + PeerLeft { + peer_id: String, + }, + /// Peer started sharing their screen + StartedSharing { + peer_id: String, + has_audio: bool, + }, + /// Peer stopped sharing + StoppedSharing { + peer_id: String, + }, + /// WebRTC offer (peer-to-peer, relayed by server) + Offer { + from: String, + to: String, + sdp: String, + }, + /// WebRTC answer + Answer { + from: String, + to: String, + sdp: String, + }, + /// ICE candidate + IceCandidate { + from: String, + to: String, + candidate: String, + }, + /// Request to connect to a sharing peer + RequestStream { + from: String, + to: String, + }, + /// Error message + Error { + message: String, + }, +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +struct PeerInfo { + peer_id: String, + name: String, + is_sharing: bool, + has_audio: bool, +} + +/// State for a connected peer +struct PeerState { + name: String, + is_sharing: bool, + has_audio: bool, + tx: broadcast::Sender, +} + +/// Application state shared across all connections +struct AppState { + peers: DashMap, +} + +impl AppState { + fn new() -> Self { + Self { + peers: DashMap::new(), + } + } + + fn get_peer_list(&self) -> Vec { + self.peers + .iter() + .map(|entry| PeerInfo { + peer_id: entry.key().clone(), + name: entry.value().name.clone(), + is_sharing: entry.value().is_sharing, + has_audio: entry.value().has_audio, + }) + .collect() + } + + fn broadcast(&self, msg: SignalMessage, exclude: Option<&str>) { + for entry in self.peers.iter() { + if exclude.map_or(true, |ex| entry.key() != ex) { + let _ = entry.value().tx.send(msg.clone()); + } + } + } + + fn send_to(&self, peer_id: &str, msg: SignalMessage) { + if let Some(peer) = self.peers.get(peer_id) { + let _ = peer.tx.send(msg); + } + } +} + +#[tokio::main] +async fn main() { + let args = Args::parse(); + + tracing_subscriber::fmt() + .with_env_filter( + tracing_subscriber::EnvFilter::from_default_env() + ) + .init(); + + let state = Arc::new(AppState::new()); + + let app = Router::new() + .route("/", get(serve_index)) + .route("/ws", get(ws_handler)) + .layer(CorsLayer::permissive()) + .with_state(state); + + let addr: SocketAddr = format!("{}:{}", args.host, args.port) + .parse() + .expect("Invalid host:port combination"); + + println!(); + println!(" ╭─────────────────────────────────────────╮"); + println!(" │ \x1b[1;33mLAN Share\x1b[0m │"); + println!(" │ P2P Screen Sharing for Local Networks │"); + println!(" ╰─────────────────────────────────────────╯"); + println!(); + println!(" \x1b[1mServer running at:\x1b[0m"); + println!(" → http://{}", addr); + if args.host == "0.0.0.0" { + if let Ok(local_ip) = local_ip_address::local_ip() { + println!(" → http://{}:{}", local_ip, args.port); + } + } + println!(); + println!(" \x1b[90mOpen this URL in browsers on your local network.\x1b[0m"); + println!(" \x1b[90mPress Ctrl+C to stop the server.\x1b[0m"); + println!(); + + info!("Server starting on {}", addr); + + + let config = RustlsConfig::from_pem_file(args.certificate, args.key).await.unwrap(); + + axum_server::bind_rustls(addr, config).serve(app.into_make_service()).await.unwrap(); +} + +async fn serve_index() -> impl IntoResponse { + Html(include_str!("../static/index.html")) +} + +async fn ws_handler(ws: WebSocketUpgrade, State(state): State>) -> impl IntoResponse { + ws.on_upgrade(move |socket| handle_socket(socket, state)) +} + +async fn handle_socket(socket: WebSocket, state: Arc) { + let peer_id = Uuid::new_v4().to_string(); + let (tx, _) = broadcast::channel::(64); + + // Add peer to state with default name + state.peers.insert( + peer_id.clone(), + PeerState { + name: format!("Peer {}", &peer_id[..8]), + is_sharing: false, + has_audio: false, + tx: tx.clone(), + }, + ); + + let peers = state.get_peer_list(); + info!("Peer {} connected ({} total peers)", &peer_id[..8], peers.len()); + + let (mut sender, mut receiver) = socket.split(); + + // Send welcome message with current peer list + let welcome = SignalMessage::Welcome { + peer_id: peer_id.clone(), + peers: peers.into_iter().filter(|p| p.peer_id != peer_id).collect(), + }; + + if sender + .send(Message::Text(serde_json::to_string(&welcome).unwrap().into())) + .await + .is_err() + { + state.peers.remove(&peer_id); + return; + } + + // Subscribe to broadcast messages for this peer + let mut rx = tx.subscribe(); + let peer_id_clone = peer_id.clone(); + + // Task to forward broadcast messages to this peer's websocket + let mut send_task = tokio::spawn(async move { + while let Ok(msg) = rx.recv().await { + let text = serde_json::to_string(&msg).unwrap(); + if sender.send(Message::Text(text.into())).await.is_err() { + break; + } + } + }); + + // Task to handle incoming messages from this peer + let state_clone = state.clone(); + let peer_id_for_recv = peer_id.clone(); + let mut recv_task = tokio::spawn(async move { + while let Some(Ok(msg)) = receiver.next().await { + if let Message::Text(text) = msg { + match serde_json::from_str::(&text) { + Ok(signal) => { + handle_signal(&state_clone, &peer_id_for_recv, signal).await; + } + Err(e) => { + warn!("Failed to parse message from {}: {}", &peer_id_for_recv[..8], e); + } + } + } + } + }); + + // Wait for either task to complete (connection closed) + tokio::select! { + _ = &mut send_task => recv_task.abort(), + _ = &mut recv_task => send_task.abort(), + } + + // Clean up: remove peer and notify others + if let Some((_, peer_state)) = state.peers.remove(&peer_id_clone) { + info!( + "Peer {} ({}) disconnected", + &peer_id_clone[..8], + peer_state.name + ); + state.broadcast( + SignalMessage::PeerLeft { + peer_id: peer_id_clone, + }, + None, + ); + } +} + +async fn handle_signal(state: &AppState, from_peer: &str, signal: SignalMessage) { + match signal { + SignalMessage::Announce { name } => { + if let Some(mut peer) = state.peers.get_mut(from_peer) { + peer.name = name.clone(); + } + state.broadcast( + SignalMessage::PeerJoined { + peer_id: from_peer.to_string(), + name, + }, + Some(from_peer), + ); + } + + SignalMessage::StartedSharing { has_audio, .. } => { + if let Some(mut peer) = state.peers.get_mut(from_peer) { + peer.is_sharing = true; + peer.has_audio = has_audio; + } + state.broadcast( + SignalMessage::StartedSharing { + peer_id: from_peer.to_string(), + has_audio, + }, + Some(from_peer), + ); + } + + SignalMessage::StoppedSharing { .. } => { + if let Some(mut peer) = state.peers.get_mut(from_peer) { + peer.is_sharing = false; + peer.has_audio = false; + } + state.broadcast( + SignalMessage::StoppedSharing { + peer_id: from_peer.to_string(), + }, + Some(from_peer), + ); + } + + SignalMessage::Offer { to, sdp, .. } => { + state.send_to( + &to, + SignalMessage::Offer { + from: from_peer.to_string(), + to: to.clone(), + sdp, + }, + ); + } + + SignalMessage::Answer { to, sdp, .. } => { + state.send_to( + &to, + SignalMessage::Answer { + from: from_peer.to_string(), + to: to.clone(), + sdp, + }, + ); + } + + SignalMessage::IceCandidate { to, candidate, .. } => { + state.send_to( + &to, + SignalMessage::IceCandidate { + from: from_peer.to_string(), + to: to.clone(), + candidate, + }, + ); + } + + SignalMessage::RequestStream { to, .. } => { + state.send_to( + &to, + SignalMessage::RequestStream { + from: from_peer.to_string(), + to: to.clone(), + }, + ); + } + + _ => {} + } +} diff --git a/lanshare/static/index.html b/lanshare/static/index.html new file mode 100644 index 0000000..2544928 --- /dev/null +++ b/lanshare/static/index.html @@ -0,0 +1,1071 @@ + + + + + + LAN Share + + + + + + + + + + +
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