feat: event management and websocket for updates

sparse-unix-beacon/src/linux.rs

@@ -22,6 +22,8 @@ pub struct LinuxAdapter;
 impl BeaconAdapter for LinuxAdapter {
     type Error = LinuxAdapterError;
 
+    const OPERATING_SYSTEM: &'static str = "Linux";
+
     fn interface_name_from_interface(interface: &BeaconInterface) -> Vec<u8> {
         interface.name.clone()
     }
@@ -88,4 +90,33 @@ impl BeaconAdapter for LinuxAdapter {
                 .collect(),
         })
     }
+
+    async fn get_username(&self) -> Result<String, error::BeaconError<Self::Error>> {
+        let passwd = tokio::fs::read_to_string("/etc/passwd").await?;
+        let uid = unsafe { libc::getuid() };
+
+        Ok(passwd
+            .split("\n")
+            .find_map(|row| -> Option<String> {
+                let mut entries = row.split(":");
+
+                let name = entries.next()?;
+                entries.next()?;
+                let euid = entries.next()?.parse::<u32>().ok()?;
+
+                if euid == uid {
+                    Some(name.to_string())
+                } else {
+                    None
+                }
+            })
+            .unwrap_or("(unknown)".to_string()))
+    }
+
+    async fn get_hostname(&self) -> Result<String, error::BeaconError<Self::Error>> {
+        Ok(tokio::fs::read_to_string("/etc/hostname")
+            .await?
+            .trim()
+            .to_string())
+    }
 }