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|
use std::convert::TryFrom;
use std::fmt::Debug;
use crate::nlmsg::{NfNetlinkObject, NfNetlinkWriter};
use crate::parser::{
get_operation_from_nlmsghdr_type, parse_nlmsg, parse_object, Attribute, DecodeError,
NfNetlinkAttributeReader, NfNetlinkAttributes, Nfgenmsg, NlMsg, SerializeNfNetlink,
};
use crate::sys::{
self, NFTA_OBJ_TABLE, NFTA_TABLE_FLAGS, NFTA_TABLE_NAME, NFT_MSG_DELTABLE, NFT_MSG_GETTABLE,
NFT_MSG_NEWTABLE, NLM_F_ACK,
};
use crate::{impl_attr_getters_and_setters, MsgType, ProtoFamily};
/// Abstraction of `nftnl_table`, the top level container in netfilter. A table has a protocol
/// family and contains [`Chain`]s that in turn hold the rules.
///
/// [`Chain`]: struct.Chain.html
#[derive(Debug, PartialEq, Eq)]
pub struct Table {
inner: NfNetlinkAttributes,
family: ProtoFamily,
}
impl Table {
pub fn new(family: ProtoFamily) -> Table {
Table {
inner: NfNetlinkAttributes::new(),
family,
}
}
/*
/// Returns a textual description of the table.
pub fn get_str(&self) -> CString {
let mut descr_buf = vec![0i8; 4096];
unsafe {
sys::nftnl_table_snprintf(
descr_buf.as_mut_ptr() as *mut c_char,
(descr_buf.len() - 1) as u64,
self.table,
sys::NFTNL_OUTPUT_DEFAULT,
0,
);
CStr::from_ptr(descr_buf.as_ptr() as *mut c_char).to_owned()
}
}
*/
}
/*
impl PartialEq for Table {
fn eq(&self, other: &Self) -> bool {
self.get_name() == other.get_name() && self.family == other.family
}
}
*/
impl NfNetlinkObject for Table {
fn add_or_remove<'a>(&self, writer: &mut NfNetlinkWriter<'a>, msg_type: MsgType, seq: u32) {
let raw_msg_type = match msg_type {
MsgType::Add => NFT_MSG_NEWTABLE,
MsgType::Del => NFT_MSG_DELTABLE,
} as u16;
writer.write_header(raw_msg_type, self.family, NLM_F_ACK as u16, seq, None);
self.inner.serialize(writer);
writer.finalize_writing_object();
}
fn decode_attribute(attr_type: u16, buf: &[u8]) -> Result<Attribute, DecodeError> {
match attr_type {
NFTA_TABLE_NAME => Ok(Attribute::String(String::from_utf8(buf.to_vec())?)),
NFTA_TABLE_FLAGS => {
let val = [buf[0], buf[1], buf[2], buf[3]];
Ok(Attribute::U32(u32::from_ne_bytes(val)))
}
NFTA_TABLE_USERDATA => Ok(Attribute::VecU8(buf.to_vec())),
_ => Err(DecodeError::UnsupportedAttributeType(attr_type)),
}
}
fn deserialize(buf: &[u8]) -> Result<(Self, &[u8]), DecodeError> {
let (hdr, msg) = parse_nlmsg(buf)?;
let op = get_operation_from_nlmsghdr_type(hdr.nlmsg_type) as u32;
if op != NFT_MSG_NEWTABLE && op != NFT_MSG_DELTABLE {
return Err(DecodeError::UnexpectedType(hdr.nlmsg_type));
}
let (nfgenmsg, attrs, remaining_data) = parse_object(hdr, msg, buf)?;
let inner = attrs.decode::<Table>()?;
Ok((
Table {
inner,
family: ProtoFamily::try_from(nfgenmsg.family as i32)?,
},
remaining_data,
))
}
}
impl_attr_getters_and_setters!(
Table,
[
(get_name, set_name, with_name, sys::NFTA_TABLE_NAME, String, String),
(
get_userdata,
set_userdata,
with_userdata,
sys::NFTA_TABLE_USERDATA,
VecU8,
Vec<u8>
),
(get_flags, set_flags, with_flags, sys::NFTA_TABLE_FLAGS, U32, u32)
]
);
pub fn list_tables() -> Result<Vec<Table>, crate::query::Error> {
let mut result = Vec::new();
crate::query::list_objects_with_data(
NFT_MSG_GETTABLE as u16,
&|table: Table, tables: &mut Vec<Table>| {
tables.push(table);
Ok(())
},
None,
&mut result,
)?;
Ok(result)
}
|
