Initial Upload of Files

examples/monitor.rs

@@ -0,0 +1,43 @@
+extern crate dhcp4r;
+extern crate time;
+
+use dhcp4r::{options, packet, server};
+use std::net::{Ipv4Addr, UdpSocket};
+
+fn main() {
+    server::Server::serve(
+        UdpSocket::bind("0.0.0.0:67").unwrap(),
+        Ipv4Addr::new(0, 0, 0, 0),
+        MyServer {},
+    );
+}
+
+struct MyServer {}
+
+impl server::Handler for MyServer {
+    fn handle_request(&mut self, _: &server::Server, in_packet: packet::Packet) {
+        match in_packet.message_type() {
+            Ok(options::MessageType::Request) => {
+                let req_ip = match in_packet.option(options::REQUESTED_IP_ADDRESS) {
+                    Some(options::DhcpOption::RequestedIpAddress(x)) => x.clone(),
+                    _ => in_packet.ciaddr,
+                };
+                println!(
+                    "{}\t{}\t{}\tOnline",
+                    time::OffsetDateTime::now_local().format("%Y-%m-%dT%H:%M:%S"),
+                    chaddr(&in_packet.chaddr),
+                    Ipv4Addr::from(req_ip)
+                );
+            }
+            _ => {}
+        }
+    }
+}
+
+/// Formats byte array machine address into hex pairs separated by colons.
+/// Array must be at least one byte long.
+fn chaddr(a: &[u8]) -> String {
+    a[1..].iter().fold(format!("{:02x}", a[0]), |acc, &b| {
+        format!("{}:{:02x}", acc, &b)
+    })
+}