use crate::{
message::{NetfilterHeader, NetfilterMessage, NetfilterMessageInner, NETFILTER_HEADER_LEN},
nflog::NfLogMessage,
traits::{Parseable, ParseableParametrized},
DecodeError,
};
use anyhow::Context;
use netlink_packet_utils::{
buffer,
nla::{DefaultNla, NlaBuffer, NlasIterator},
};
buffer!(NetfilterBuffer(NETFILTER_HEADER_LEN) {
header: (slice, ..NETFILTER_HEADER_LEN),
payload: (slice, NETFILTER_HEADER_LEN..),
});
impl<'a, T: AsRef<[u8]> + ?Sized> NetfilterBuffer<&'a T> {
pub fn nlas(&self) -> impl Iterator<Item = Result<NlaBuffer<&'a [u8]>, DecodeError>> {
NlasIterator::new(self.payload())
}
pub fn parse_all_nlas<F, U>(&self, f: F) -> Result<Vec<U>, DecodeError>
where
F: Fn(NlaBuffer<&[u8]>) -> Result<U, DecodeError>,
{
Ok(self
.nlas()
.map(|buf| f(buf?))
.collect::<Result<Vec<_>, _>>()
.context("failed to parse NLAs")?)
}
pub fn default_nlas(&self) -> Result<Vec<DefaultNla>, DecodeError> {
self.parse_all_nlas(|buf| DefaultNla::parse(&buf))
}
}
impl<'a, T: AsRef<[u8]> + ?Sized> ParseableParametrized<NetfilterBuffer<&'a T>, u16>
for NetfilterMessage
{
fn parse_with_param(
buf: &NetfilterBuffer<&'a T>,
message_type: u16,
) -> Result<Self, DecodeError> {
let header_buf = crate::message::NetfilterHeaderBuffer::new(buf.inner());
let header =
NetfilterHeader::parse(&header_buf).context("failed to parse netfilter header")?;
let subsys = (message_type >> 8) as u8;
let message_type = message_type as u8;
let inner = match subsys {
NfLogMessage::SUBSYS => NetfilterMessageInner::NfLog(
NfLogMessage::parse_with_param(buf, message_type)
.context("failed to parse nflog payload")?,
),
_ => NetfilterMessageInner::Other {
subsys,
message_type,
nlas: buf.default_nlas()?,
},
};
Ok(NetfilterMessage::new(header, inner))
}
}