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// SPDX-License-Identifier: MIT
use netlink_packet_core::{
NetlinkMessage, NetlinkPayload, NLM_F_DUMP, NLM_F_REQUEST,
};
use netlink_packet_generic::{
ctrl::{nlas::GenlCtrlAttrs, GenlCtrl, GenlCtrlCmd},
GenlMessage,
};
use netlink_sys::{protocols::NETLINK_GENERIC, Socket, SocketAddr};
fn main() {
let mut socket = Socket::new(NETLINK_GENERIC).unwrap();
socket.bind_auto().unwrap();
socket.connect(&SocketAddr::new(0, 0)).unwrap();
let mut genlmsg = GenlMessage::from_payload(GenlCtrl {
cmd: GenlCtrlCmd::GetFamily,
nlas: vec![],
});
genlmsg.finalize();
let mut nlmsg = NetlinkMessage::from(genlmsg);
nlmsg.header.flags = NLM_F_REQUEST | NLM_F_DUMP;
nlmsg.finalize();
let mut txbuf = vec![0u8; nlmsg.buffer_len()];
nlmsg.serialize(&mut txbuf);
socket.send(&txbuf, 0).unwrap();
let mut rxbuf = vec![0u8; 4096];
let mut offset = 0;
'outer: loop {
let size = socket.recv(&mut rxbuf, 0).unwrap();
loop {
let buf = &rxbuf[offset..];
// Parse the message
let msg = <NetlinkMessage<GenlMessage<GenlCtrl>>>::deserialize(buf)
.unwrap();
match msg.payload {
NetlinkPayload::Done(_) => break 'outer,
NetlinkPayload::InnerMessage(genlmsg) => {
if GenlCtrlCmd::NewFamily == genlmsg.payload.cmd {
print_entry(genlmsg.payload.nlas);
}
}
NetlinkPayload::Error(err) => {
eprintln!("Received a netlink error message: {err:?}");
return;
}
_ => {}
}
offset += msg.header.length as usize;
if offset == size || msg.header.length == 0 {
offset = 0;
break;
}
}
}
}
fn print_entry(entry: Vec<GenlCtrlAttrs>) {
let family_id = entry
.iter()
.find_map(|nla| {
if let GenlCtrlAttrs::FamilyId(id) = nla {
Some(*id)
} else {
None
}
})
.expect("Cannot find FamilyId attribute");
let family_name = entry
.iter()
.find_map(|nla| {
if let GenlCtrlAttrs::FamilyName(name) = nla {
Some(name.as_str())
} else {
None
}
})
.expect("Cannot find FamilyName attribute");
let version = entry
.iter()
.find_map(|nla| {
if let GenlCtrlAttrs::Version(ver) = nla {
Some(*ver)
} else {
None
}
})
.expect("Cannot find Version attribute");
let hdrsize = entry
.iter()
.find_map(|nla| {
if let GenlCtrlAttrs::HdrSize(hdr) = nla {
Some(*hdr)
} else {
None
}
})
.expect("Cannot find HdrSize attribute");
if hdrsize == 0 {
println!("0x{family_id:04x} {family_name} [Version {version}]");
} else {
println!("0x{family_id:04x} {family_name} [Version {version}] [Header {hdrsize} bytes]");
}
}
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