Merge branch 'release/0.9.26'

3 files changed, 30 insertions, 8 deletions

diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 421c336f2..85531ce15 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -7,7 +7,10 @@ import (
 	"sync/atomic"
 	"time"
 
+	"gopkg.in/fatih/set.v0"
+
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
@@ -75,6 +78,7 @@ type Downloader struct {
 	queue  *queue                      // Scheduler for selecting the hashes to download
 	peers  *peerSet                    // Set of active peers from which download can proceed
 	checks map[common.Hash]*crossCheck // Pending cross checks to verify a hash chain
+	banned *set.SetNonTS               // Set of hashes we've received and banned
 
 	// Callbacks
 	hasBlock hashCheckFn
@@ -100,6 +104,7 @@ type Block struct {
 }
 
 func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock getBlockFn) *Downloader {
+	// Create the base downloader
 	downloader := &Downloader{
 		mux:       mux,
 		queue:     newQueue(),
@@ -110,6 +115,11 @@ func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock getBlockFn) *Downloa
 		hashCh:    make(chan hashPack, 1),
 		blockCh:   make(chan blockPack, 1),
 	}
+	// Inject all the known bad hashes
+	downloader.banned = set.NewNonTS()
+	for hash, _ := range core.BadHashes {
+		downloader.banned.Add(hash)
+	}
 	return downloader
 }
 
@@ -280,6 +290,12 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
 				glog.V(logger.Debug).Infof("Peer (%s) responded with empty hash set\n", active.id)
 				return errEmptyHashSet
 			}
+			for _, hash := range hashPack.hashes {
+				if d.banned.Has(hash) {
+					glog.V(logger.Debug).Infof("Peer (%s) sent a known invalid chain\n", active.id)
+					return ErrInvalidChain
+				}
+			}
 			// Determine if we're done fetching hashes (queue up all pending), and continue if not done
 			done, index := false, 0
 			for index, head = range hashPack.hashes {
diff --git a/eth/handler.go b/eth/handler.go
index 777a9c7c0..aea33452c 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -2,7 +2,6 @@ package eth
 
 import (
 	"fmt"
-	"math"
 	"math/big"
 	"sync"
 	"time"
@@ -93,14 +92,22 @@ func NewProtocolManager(protocolVersion, networkId int, mux *event.TypeMux, txpo
 }
 
 func (pm *ProtocolManager) removePeer(id string) {
-	// Unregister the peer from the downloader
-	pm.downloader.UnregisterPeer(id)
+	// Short circuit if the peer was already removed
+	peer := pm.peers.Peer(id)
+	if peer == nil {
+		return
+	}
+	glog.V(logger.Debug).Infoln("Removing peer", id)
 
-	// Remove the peer from the Ethereum peer set too
-	glog.V(logger.Detail).Infoln("Removing peer", id)
+	// Unregister the peer from the downloader and Ethereum peer set
+	pm.downloader.UnregisterPeer(id)
 	if err := pm.peers.Unregister(id); err != nil {
 		glog.V(logger.Error).Infoln("Removal failed:", err)
 	}
+	// Hard disconnect at the networking layer
+	if peer != nil {
+		peer.Peer.Disconnect(p2p.DiscUselessPeer)
+	}
 }
 
 func (pm *ProtocolManager) Start() {
@@ -351,7 +358,7 @@ func (pm *ProtocolManager) verifyTd(peer *peer, request newBlockMsgData) error {
 func (pm *ProtocolManager) BroadcastBlock(hash common.Hash, block *types.Block) {
 	// Broadcast block to a batch of peers not knowing about it
 	peers := pm.peers.PeersWithoutBlock(hash)
-	peers = peers[:int(math.Sqrt(float64(len(peers))))]
+	//peers = peers[:int(math.Sqrt(float64(len(peers))))]
 	for _, peer := range peers {
 		peer.sendNewBlock(block)
 	}
diff --git a/eth/sync.go b/eth/sync.go
index cf549f852..76e137630 100644
--- a/eth/sync.go
+++ b/eth/sync.go
@@ -70,6 +70,7 @@ func (pm *ProtocolManager) processBlocks() error {
 		// Try to inset the blocks, drop the originating peer if there's an error
 		index, err := pm.chainman.InsertChain(raw)
 		if err != nil {
+			glog.V(logger.Debug).Infoln("Downloaded block import failed:", err)
 			pm.removePeer(blocks[index].OriginPeer)
 			pm.downloader.Cancel()
 			return err
@@ -84,12 +85,10 @@ func (pm *ProtocolManager) processBlocks() error {
 func (pm *ProtocolManager) synchronise(peer *peer) {
 	// Short circuit if no peers are available
 	if peer == nil {
-		glog.V(logger.Debug).Infoln("Synchronisation canceled: no peers available")
 		return
 	}
 	// Make sure the peer's TD is higher than our own. If not drop.
 	if peer.td.Cmp(pm.chainman.Td()) <= 0 {
-		glog.V(logger.Debug).Infoln("Synchronisation canceled: peer's total difficulty is too small")
 		return
 	}
 	// FIXME if we have the hash in our chain and the TD of the peer is