feat(homelab): add dhcp lease parsing

nix/homelab/src/transport/ssh.rs

@@ -0,0 +1,46 @@
+use std::{io::Read, net::TcpStream, path::Path};
+
+use ssh2::Session;
+
+use crate::{error::Result, transport::Transport};
+
+pub struct SSHTransport {
+    session: Session,
+}
+
+impl SSHTransport {
+    pub fn new(host: &str) -> Result<Self> {
+        let stream = TcpStream::connect(host)?;
+
+        let mut s = Self {
+            session: Session::new()?,
+        };
+        s.session.set_tcp_stream(stream);
+        s.session.handshake()?;
+        s.session.userauth_pubkey_file(
+            "luca",
+            None,
+            Path::new("/home/luca/.ssh/id_ed25519"),
+            None,
+        )?;
+        Ok(s)
+    }
+}
+
+impl Transport for SSHTransport {
+    fn fetch(&self, resource: &str) -> Result<String> {
+        let mut channel = self.session.channel_session()?;
+        channel.exec(&format!("cat {}", resource))?;
+
+        let mut output = String::new();
+        channel.read_to_string(&mut output)?;
+        channel.wait_close()?;
+
+        let c = channel.exit_status()?;
+        if c != 0 {
+            return Err(crate::error::Error::ExitCode(c));
+        }
+
+        Ok(output)
+    }
+}