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use std::fmt::Debug;
use rustables_macros::nfnetlink_struct;
use crate::chain::Chain;
use crate::error::{BuilderError, QueryError};
use crate::expr::{ExpressionList, RawExpression};
use crate::nlmsg::NfNetlinkObject;
use crate::query::list_objects_with_data;
use crate::sys::{
NFTA_RULE_CHAIN, NFTA_RULE_EXPRESSIONS, NFTA_RULE_HANDLE, NFTA_RULE_ID, NFTA_RULE_POSITION,
NFTA_RULE_TABLE, NFTA_RULE_USERDATA, NFT_MSG_DELRULE, NFT_MSG_NEWRULE, NLM_F_APPEND,
NLM_F_CREATE,
};
use crate::{Batch, ProtocolFamily};
/// A nftables firewall rule.
#[derive(Clone, PartialEq, Eq, Default, Debug)]
#[nfnetlink_struct(derive_deserialize = false)]
pub struct Rule {
family: ProtocolFamily,
#[field(NFTA_RULE_TABLE)]
table: String,
#[field(NFTA_RULE_CHAIN)]
chain: String,
#[field(NFTA_RULE_HANDLE)]
handle: u64,
#[field(NFTA_RULE_EXPRESSIONS)]
expressions: ExpressionList,
#[field(NFTA_RULE_POSITION)]
position: u64,
#[field(NFTA_RULE_USERDATA)]
userdata: Vec<u8>,
#[field(NFTA_RULE_ID)]
id: u32,
}
impl Rule {
/// Creates a new rule object in the given [`Chain`].
///
/// [`Chain`]: struct.Chain.html
pub fn new(chain: &Chain) -> Result<Rule, BuilderError> {
Ok(Rule::default()
.with_family(chain.get_family())
.with_table(
chain
.get_table()
.ok_or(BuilderError::MissingChainInformationError)?,
)
.with_chain(
chain
.get_name()
.ok_or(BuilderError::MissingChainInformationError)?,
))
}
pub fn add_expr(&mut self, e: impl Into<RawExpression>) {
let exprs = match self.get_mut_expressions() {
Some(x) => x,
None => {
self.set_expressions(ExpressionList::default());
self.get_mut_expressions().unwrap()
}
};
exprs.add_value(e);
}
pub fn with_expr(mut self, e: impl Into<RawExpression>) -> Self {
self.add_expr(e);
self
}
/// Appends this rule to `batch`
pub fn add_to_batch(self, batch: &mut Batch) -> Self {
batch.add(&self, crate::MsgType::Add);
self
}
}
impl NfNetlinkObject for Rule {
const MSG_TYPE_ADD: u32 = NFT_MSG_NEWRULE;
const MSG_TYPE_DEL: u32 = NFT_MSG_DELRULE;
fn get_family(&self) -> ProtocolFamily {
self.family
}
fn set_family(&mut self, family: ProtocolFamily) {
self.family = family;
}
// append at the end of the chain, instead of the beginning
fn get_add_flags(&self) -> u32 {
NLM_F_CREATE | NLM_F_APPEND
}
}
pub fn list_rules_for_chain(chain: &Chain) -> Result<Vec<Rule>, QueryError> {
let mut result = Vec::new();
list_objects_with_data(
libc::NFT_MSG_GETRULE as u16,
&|rule: Rule, rules: &mut Vec<Rule>| {
rules.push(rule);
Ok(())
},
// only retrieve rules from the currently targetted chain
Some(&Rule::new(chain)?),
&mut result,
)?;
Ok(result)
}
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