Provide human readable error messages
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parent
b3ec1bf1bf
commit
d7c8e9cde5
7
Cargo.lock
generated
7
Cargo.lock
generated
@ -75,6 +75,12 @@ dependencies = [
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"windows-sys",
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]
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[[package]]
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name = "anyhow"
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version = "1.0.86"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b3d1d046238990b9cf5bcde22a3fb3584ee5cf65fb2765f454ed428c7a0063da"
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[[package]]
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name = "async-trait"
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version = "0.1.81"
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@ -205,6 +211,7 @@ checksum = "a7993efb860416547839c115490d4951c6d0f8ec04a3594d9dd99d50ed7ec170"
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name = "dhcpv6stateless"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"clap",
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"dhcproto",
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"hex",
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@ -4,6 +4,7 @@ version = "0.1.0"
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edition = "2021"
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[dependencies]
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anyhow = "1.0.86"
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clap = { version = "4.5.16", features = ["derive"] }
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dhcproto = "0.12.0"
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hex = "0.4.3"
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27
src/main.rs
27
src/main.rs
@ -1,3 +1,7 @@
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use anyhow::{
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Context,
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Result,
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};
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use clap::Parser;
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use dhcproto::{
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Decodable,
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@ -30,14 +34,14 @@ struct Cli {
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}
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#[tokio::main]
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async fn main() {
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async fn main() -> Result<()>{
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let cli = Cli::parse();
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let all_interfaces = pnet::datalink::interfaces();
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let selected_interface = all_interfaces
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.iter()
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.find(|i| i.name == cli.interface)
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.expect(format!("No interface found with name: {}", cli.interface).as_str());
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.with_context(|| format!("No interface found with name: {}", cli.interface))?;
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let ipv6_addresses = selected_interface.ips
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.iter()
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@ -50,10 +54,11 @@ async fn main() {
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// Just take the first address found on the interface
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let selected_address = ipv6_link_local_addresses.next()
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.expect("No IPv6 link local address assigned to this interface");
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.context("No IPv6 link local address assigned to this interface")?;
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let socket_addr = SocketAddrV6::new(selected_address.ip(), DHCP_CLIENT_PORT, 0, selected_interface.index.clone());
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let sock = UdpSocket::bind(socket_addr).await.unwrap();
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let sock = UdpSocket::bind(socket_addr).await
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.context("Unable to bind UDP socket")?;
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let remote_addr = SocketAddrV6::new(ALL_DHCP_RELAY_AGENTS_AND_SERVERS.parse().unwrap(), DHCP_RELAY_AGENT_AND_SERVER_PORT, 0, selected_interface.index.clone());
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@ -70,14 +75,18 @@ async fn main() {
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let mut msg_buf = Vec::new();
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let mut msg_encoder = Encoder::new(&mut msg_buf);
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msg.encode(&mut msg_encoder).unwrap(); // Serializes msg to msg_buf
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msg.encode(&mut msg_encoder)
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.context("Unable to serialize DHCP options for message to send")?; // Serializes msg to msg_buf
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sock.send_to(&msg_buf, remote_addr).await.unwrap();
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sock.send_to(&msg_buf, remote_addr).await
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.context("Failed to send DHCPv6 INFORMATION-REQUEST message")?;
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loop {
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let mut recv_buf = [0; 1024];
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let (len, recv_addr) = sock.recv_from(&mut recv_buf).await.unwrap();
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let recv_msg = Message::decode(&mut Decoder::new(&recv_buf)).unwrap();
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let (len, recv_addr) = sock.recv_from(&mut recv_buf).await
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.context("Failed to receive DHCPv6 response")?;
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let recv_msg = Message::decode(&mut Decoder::new(&recv_buf))
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.context("Unable to parse DHCPv6 response message")?;
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if recv_msg.xid() == msg.xid() {
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println!("{:?} bytes received from {:?}", len, recv_addr);
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@ -86,4 +95,6 @@ async fn main() {
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break;
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}
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}
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Ok(())
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}
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