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// SPDX-License-Identifier: MIT
use netlink_packet_core::{
NetlinkHeader, NetlinkMessage, NetlinkPayload, NLM_F_DUMP, NLM_F_REQUEST,
};
use netlink_packet_route::{rule::RuleMessage, RouteNetlinkMessage};
use netlink_sys::{protocols::NETLINK_ROUTE, Socket, SocketAddr};
fn main() {
let mut socket = Socket::new(NETLINK_ROUTE).unwrap();
let _port_number = socket.bind_auto().unwrap().port_number();
socket.connect(&SocketAddr::new(0, 0)).unwrap();
let mut nl_hdr = NetlinkHeader::default();
nl_hdr.flags = NLM_F_REQUEST | NLM_F_DUMP;
let mut packet = NetlinkMessage::new(
nl_hdr,
NetlinkPayload::from(RouteNetlinkMessage::GetRule(
RuleMessage::default(),
)),
);
packet.finalize();
let mut buf = vec![0; packet.header.length as usize];
// Before calling serialize, it is important to check that the buffer in
// which we're emitting is big enough for the packet, other
// `serialize()` panics.
assert!(buf.len() == packet.buffer_len());
packet.serialize(&mut buf[..]);
println!(">>> {packet:?}");
if let Err(e) = socket.send(&buf[..], 0) {
println!("SEND ERROR {e}");
}
let mut receive_buffer = vec![0; 4096];
let mut offset = 0;
// we set the NLM_F_DUMP flag so we expect a multipart rx_packet in
// response.
while let Ok(size) = socket.recv(&mut &mut receive_buffer[..], 0) {
loop {
let bytes = &receive_buffer[offset..];
let rx_packet =
<NetlinkMessage<RouteNetlinkMessage>>::deserialize(bytes)
.unwrap();
println!("<<< {rx_packet:?}");
if matches!(rx_packet.payload, NetlinkPayload::Done(_)) {
println!("Done!");
return;
}
offset += rx_packet.header.length as usize;
if offset == size || rx_packet.header.length == 0 {
offset = 0;
break;
}
}
}
}
|
