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Validate header response

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This commit is contained in:
arkpar 2016-06-14 11:29:40 +02:00
parent 1dac2e3b23
commit 5c019b74e4
1 changed files with 14 additions and 3 deletions
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17
sync/src/chain.rs
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@ -384,6 +384,7 @@ impl ChainSync {
/// Called by peer once it has new block headers during sync
fn on_peer_block_headers(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
self.clear_peer_download(peer_id);
let expected_hash = self.peers.get(&peer_id).and_then(|p| p.asking_hash);
let expected_asking = if self.state == SyncState::ChainHead { PeerAsking::Heads } else { PeerAsking::BlockHeaders };
if !self.reset_peer_asking(peer_id, expected_asking) {
trace!(target: "sync", "Ignored unexpected headers");
@ -409,9 +410,15 @@ impl ChainSync {
let mut headers = Vec::new();
let mut hashes = Vec::new();
let mut valid_response = false;
for i in 0..item_count {
let info: BlockHeader = try!(r.val_at(i));
let number = BlockNumber::from(info.number);
if !valid_response {
if let Some(expected) = expected_hash {
valid_response = expected == info.hash()
}
}
if self.blocks.contains(&info.hash()) {
trace!(target: "sync", "Skipping existing block header {} ({:?})", number, info.hash());
continue;
@ -442,6 +449,10 @@ impl ChainSync {
}
}
if !valid_response {
trace!(target: "sync", "{} Disabled for invalid headers response", peer_id);
self.deactivate_peer(io, peer_id); // disable the peer for this syncing round if it gives invalid chain
}
match self.state {
SyncState::ChainHead => {
if headers.is_empty() {
@ -457,9 +468,6 @@ impl ChainSync {
}
},
SyncState::Blocks | SyncState::NewBlocks | SyncState::Waiting => {
if headers.len() == 0 {
self.deactivate_peer(io, peer_id); // disable the peer for this syncing round if it gives invalid chain
}
trace!(target: "sync", "Inserted {} headers", headers.len());
self.blocks.insert_headers(headers);
},
@ -835,6 +843,9 @@ impl ChainSync {
rlp.append(&skip);
rlp.append(&if reverse {1u32} else {0u32});
self.send_request(sync, peer_id, asking, GET_BLOCK_HEADERS_PACKET, rlp.out());
if let Some(ref mut peer) = self.peers.get_mut(&peer_id) {
peer.asking_hash = Some(h.clone());
}
}
/// Request block bodies from a peer