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test_decode_malicious_status_message improvements (#2104)

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## Issue Addressed

None

## Proposed Changes

* Correct typo in one comment, elaborate some others.
* Add asserts to ensure comments match code.
* Eliminate one unnecessary `clone`.

## Additional Info

None
This commit is contained in:
Samuel E. Moelius 2021-01-06 01:10:26 +00:00
parent 0245ddd37b
commit 939fa717fd
1 changed files with 10 additions and 4 deletions
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14
beacon_node/eth2_libp2p/src/rpc/codec/base.rs
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@ -276,14 +276,16 @@ mod tests {
#[test]
fn test_decode_malicious_status_message() {
// Snappy stream identifier
// 10 byte snappy stream identifier
let stream_identifier: &'static [u8] = b"\xFF\x06\x00\x00sNaPpY";
assert_eq!(stream_identifier.len(), 10);
// byte 0(0xFE) is padding chunk type identifier for snappy messages
// byte 1,2,3 are chunk length (little endian)
let malicious_padding: &'static [u8] = b"\xFE\x00\x00\x00";
// Status message is 84 bytes uncompressed. `max_compressed_len` is 130.
// Status message is 84 bytes uncompressed. `max_compressed_len` is 32 + 84 + 84/6 = 130.
let status_message_bytes = StatusMessage {
fork_digest: [0; 4],
finalized_root: Hash256::from_low_u64_be(0),
@ -293,6 +295,9 @@ mod tests {
}
.as_ssz_bytes();
assert_eq!(status_message_bytes.len(), 84);
assert_eq!(snap::raw::max_compress_len(status_message_bytes.len()), 130);
let mut uvi_codec: Uvi<usize> = Uvi::default();
let mut dst = BytesMut::with_capacity(1024);
@ -313,9 +318,10 @@ mod tests {
let mut writer = FrameEncoder::new(Vec::new());
writer.write_all(&status_message_bytes).unwrap();
writer.flush().unwrap();
assert_eq!(writer.get_ref().len(), 42);
dst.extend_from_slice(writer.get_ref());
// 42 + 80 = 132 > max_compressed_len. Hence, decoding should fail with `InvalidData`.
// 10 (for stream identifier) + 80 + 42 = 132 > `max_compressed_len`. Hence, decoding should fail with `InvalidData`.
let snappy_protocol_id =
ProtocolId::new(Protocol::Status, Version::V1, Encoding::SSZSnappy);
@ -323,7 +329,7 @@ mod tests {
let mut snappy_outbound_codec =
SSZSnappyOutboundCodec::<Spec>::new(snappy_protocol_id, 1_048_576);
let snappy_decoded_message = snappy_outbound_codec.decode(&mut dst.clone()).unwrap_err();
let snappy_decoded_message = snappy_outbound_codec.decode(&mut dst).unwrap_err();
assert_eq!(snappy_decoded_message, RPCError::InvalidData);
}
}