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// Tests for encoding/decoding relay messages into relay cell bodies.
use tor_bytes::Error;
use tor_cell::relaycell::{msg, msg::RelayMsg, RelayCell, RelayCmd, StreamId};
const CELL_BODY_LEN: usize = 509;
struct BadRng;
impl rand::RngCore for BadRng {
fn next_u32(&mut self) -> u32 {
0xf0f0f0f0
}
fn next_u64(&mut self) -> u64 {
0xf0f0f0f0f0f0f0f0
}
fn fill_bytes(&mut self, dest: &mut [u8]) {
dest.fill(0xf0);
}
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand::Error> {
self.fill_bytes(dest);
Ok(())
}
}
// I won't tell if you don't.
impl rand::CryptoRng for BadRng {}
fn decode(body: &str) -> [u8; CELL_BODY_LEN] {
let mut body = body.to_string();
body.retain(|c| !c.is_whitespace());
let mut body = hex::decode(body).unwrap();
body.resize(CELL_BODY_LEN, 0xf0); // see BadRng
let mut result = [0; CELL_BODY_LEN];
result.copy_from_slice(&body[..]);
result
}
fn cell(body: &str, id: StreamId, msg: RelayMsg) {
let body = decode(body);
let mut bad_rng = BadRng;
let expected = RelayCell::new(id, msg);
let decoded = RelayCell::decode(body).unwrap();
assert_eq!(format!("{:?}", expected), format!("{:?}", decoded));
let encoded1 = decoded.encode(&mut bad_rng).unwrap();
let encoded2 = expected.encode(&mut bad_rng).unwrap();
assert_eq!(&encoded1[..], &encoded2[..]);
}
#[test]
fn bad_rng() {
use rand::RngCore;
let mut rng = BadRng;
assert_eq!(rng.next_u32(), 0xf0f0f0f0);
assert_eq!(rng.next_u64(), 0xf0f0f0f0f0f0f0f0);
let mut buf = [0u8; 19];
assert!(rng.try_fill_bytes(&mut buf).is_ok());
assert_eq!(
&buf,
&[
0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
]
);
}
#[test]
fn test_cells() {
cell(
"02 0000 9999 12345678 000c 6e6565642d746f2d6b6e6f77 00000000",
0x9999.into(),
msg::Data::new(&b"need-to-know"[..]).unwrap().into(),
);
// length too big: 0x1f3 is one byte too many.
let m = decode("02 0000 9999 12345678 01f3 6e6565642d746f2d6b6e6f77 00000000");
assert_eq!(
RelayCell::decode(m).err(),
Some(Error::BadMessage("Insufficient data in relay cell"))
);
// check accessors.
let m = decode("02 0000 9999 12345678 01f2 6e6565642d746f2d6b6e6f77 00000000");
let c = RelayCell::decode(m).unwrap();
assert_eq!(c.cmd(), RelayCmd::from(2));
assert_eq!(c.msg().cmd(), RelayCmd::from(2));
let (s, _) = c.into_streamid_and_msg();
assert_eq!(s, StreamId::from(0x9999));
}
#[test]
fn test_streamid() {
let zero: StreamId = 0.into();
let two: StreamId = 2.into();
assert!(zero.is_zero());
assert!(!two.is_zero());
assert_eq!(format!("{}", zero), "0");
assert_eq!(format!("{}", two), "2");
assert_eq!(u16::from(zero), 0_u16);
assert_eq!(u16::from(two), 2_u16);
assert!(RelayCmd::DATA.accepts_streamid_val(two));
assert!(!RelayCmd::DATA.accepts_streamid_val(zero));
assert!(RelayCmd::EXTEND2.accepts_streamid_val(zero));
assert!(!RelayCmd::EXTEND2.accepts_streamid_val(two));
}
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