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#![allow(dead_code)]
use libc::{nlmsghdr, AF_UNIX, NFNETLINK_V0, NFNL_SUBSYS_NFTABLES};
use rustables::set::SetKey;
use rustables::{nft_nlmsg_maxsize, Chain, MsgType, NlMsg, ProtoFamily, Rule, Set, Table};
use std::ffi::{c_void, CStr};
use std::mem::size_of;
use std::rc::Rc;
pub fn get_subsystem_from_nlmsghdr_type(x: u16) -> u8 {
((x & 0xff00) >> 8) as u8
}
pub fn get_operation_from_nlmsghdr_type(x: u16) -> u8 {
(x & 0x00ff) as u8
}
pub const TABLE_NAME: &[u8; 10] = b"mocktable\0";
pub const CHAIN_NAME: &[u8; 10] = b"mockchain\0";
pub const SET_NAME: &[u8; 8] = b"mockset\0";
pub const TABLE_USERDATA: &[u8; 14] = b"mocktabledata\0";
pub const CHAIN_USERDATA: &[u8; 14] = b"mockchaindata\0";
pub const RULE_USERDATA: &[u8; 13] = b"mockruledata\0";
pub const SET_USERDATA: &[u8; 12] = b"mocksetdata\0";
pub const SET_ID: u32 = 123456;
type NetLinkType = u16;
#[derive(Debug, thiserror::Error)]
#[error("empty data")]
pub struct EmptyDataError;
#[derive(Debug, PartialEq)]
pub enum NetlinkExpr {
Nested(NetLinkType, Vec<NetlinkExpr>),
Final(NetLinkType, Vec<u8>),
List(Vec<NetlinkExpr>),
}
impl NetlinkExpr {
pub fn to_raw(self) -> Vec<u8> {
match self {
NetlinkExpr::Final(ty, val) => {
let len = val.len() + 4;
let mut res = Vec::with_capacity(len);
res.extend(&(len as u16).to_le_bytes());
res.extend(&ty.to_le_bytes());
res.extend(val);
// alignment
while res.len() % 4 != 0 {
res.push(0);
}
res
}
NetlinkExpr::Nested(ty, exprs) => {
// some heuristic to decrease allocations (even though this is
// only useful for testing so performance is not an objective)
let mut sub = Vec::with_capacity(exprs.len() * 50);
for expr in exprs {
sub.append(&mut expr.to_raw());
}
let len = sub.len() + 4;
let mut res = Vec::with_capacity(len);
// set the "NESTED" flag
res.extend(&(len as u16).to_le_bytes());
res.extend(&(ty | 0x8000).to_le_bytes());
res.extend(sub);
res
}
NetlinkExpr::List(exprs) => {
// some heuristic to decrease allocations (even though this is
// only useful for testing so performance is not an objective)
let mut list = Vec::with_capacity(exprs.len() * 50);
for expr in exprs {
list.append(&mut expr.to_raw());
}
list
}
}
}
}
#[repr(C)]
#[derive(Clone, Copy)]
pub struct Nfgenmsg {
family: u8, /* AF_xxx */
version: u8, /* nfnetlink version */
res_id: u16, /* resource id */
}
pub fn get_test_table() -> Table {
Table::new(
&CStr::from_bytes_with_nul(TABLE_NAME).unwrap(),
ProtoFamily::Inet,
)
}
pub fn get_test_chain() -> Chain {
Chain::new(
&CStr::from_bytes_with_nul(CHAIN_NAME).unwrap(),
Rc::new(get_test_table()),
)
}
pub fn get_test_rule() -> Rule {
Rule::new(Rc::new(get_test_chain()))
}
pub fn get_test_set<T: SetKey>() -> Set<T> {
Set::new(
CStr::from_bytes_with_nul(SET_NAME).unwrap(),
SET_ID,
Rc::new(get_test_table()),
ProtoFamily::Ipv4,
)
}
pub fn get_test_nlmsg_with_msg_type(
obj: &mut dyn NlMsg,
msg_type: MsgType,
) -> (nlmsghdr, Nfgenmsg, Vec<u8>) {
let mut buf = vec![0u8; nft_nlmsg_maxsize() as usize];
unsafe {
obj.write(buf.as_mut_ptr() as *mut c_void, 0, msg_type);
// right now the message is composed of the following parts:
// - nlmsghdr (contains the message size and type)
// - nfgenmsg (nftables header that describes the message family)
// - the raw value that we want to validate
let size_of_hdr = size_of::<nlmsghdr>();
let size_of_nfgenmsg = size_of::<Nfgenmsg>();
let nlmsghdr = *(buf[0..size_of_hdr].as_ptr() as *const nlmsghdr);
let nfgenmsg =
*(buf[size_of_hdr..size_of_hdr + size_of_nfgenmsg].as_ptr() as *const Nfgenmsg);
let raw_value = buf[size_of_hdr + size_of_nfgenmsg..nlmsghdr.nlmsg_len as usize]
.iter()
.map(|x| *x)
.collect();
// sanity checks on the global message (this should be very similar/factorisable for the
// most part in other tests)
// TODO: check the messages flags
assert_eq!(
get_subsystem_from_nlmsghdr_type(nlmsghdr.nlmsg_type),
NFNL_SUBSYS_NFTABLES as u8
);
assert_eq!(nlmsghdr.nlmsg_seq, 0);
assert_eq!(nlmsghdr.nlmsg_pid, 0);
assert_eq!(nfgenmsg.family, AF_UNIX as u8);
assert_eq!(nfgenmsg.version, NFNETLINK_V0 as u8);
assert_eq!(nfgenmsg.res_id.to_be(), 0);
(nlmsghdr, nfgenmsg, raw_value)
}
}
pub fn get_test_nlmsg(obj: &mut dyn NlMsg) -> (nlmsghdr, Nfgenmsg, Vec<u8>) {
get_test_nlmsg_with_msg_type(obj, MsgType::Add)
}
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