mconnect: semi-discovery stub

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>

mconnect/src/app.rs

@@ -48,5 +48,7 @@ pub fn run() -> Result<(), String> {
     let c = config::load_from_path(config_path);
 
     kdeconnect::bang();
+
+    discovery::discovery();
     Ok(())
 }

mconnect/src/discovery.rs

@@ -0,0 +1,44 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2020 Maciek Borzecki <maciek.borzecki@gmail.com>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+use std::net::{SocketAddr, UdpSocket};
+
+use log;
+
+use kdeconnect::port;
+
+pub fn discovery() -> Result<(), String> {
+    let addr = SocketAddr::from(([0, 0, 0, 0], port::DISCOVERY));
+    let s = UdpSocket::bind(addr)
+        .or_else(|e| return Err(format!("cannot bind discovery socket: {}", e)))?;
+
+    log::debug!("discovery bound to {}", addr);
+
+    let mut buf = [0; 4096];
+    let (got, from) = s
+        .recv_from(&mut buf)
+        .or_else(|e| return Err(format!("cannot receive data from socket: {}", e)))?;
+
+    log::debug!("got {} bytes from from {}", got, from);
+    log::debug!("got: {}", String::from_utf8_lossy(&buf[..got]));
+
+    Ok(())
+}