gaspersic/go-ethereum
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Merge pull request #974 from karalabe/downloader-fix-unknown-parent-attack

Browse Source 
eth, eth/downloader: handle a potential unknown parent attack
This commit is contained in:
Jeffrey Wilcke
2015-05-14 08:16:30 -07:00
parent 90b94e64fc fe87feccb1
commit 060a07cf69
4 changed files with 92 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
eth/downloader/downloader.go
View File

@ -150,16 +150,9 @@ func (d *Downloader) Synchronise(id string, hash common.Hash) error {
return d.syncWithPeer(p, hash)
}
// TakeBlocks takes blocks from the queue and yields them to the blockTaker handler
// it's possible it yields no blocks
// TakeBlocks takes blocks from the queue and yields them to the caller.
func (d *Downloader) TakeBlocks() types.Blocks {
// Check that there are blocks available and its parents are known
head := d.queue.GetHeadBlock()
if head == nil || !d.hasBlock(head.ParentHash()) {
return nil
}
// Retrieve a full batch of blocks
return d.queue.TakeBlocks(head)
return d.queue.TakeBlocks()
}
func (d *Downloader) Has(hash common.Hash) bool {