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p2pAntiflood.go
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p2pAntiflood.go
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package antiflood
import (
"fmt"
"sync"
"time"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/process/throttle/antiflood/disabled"
)
const unidentifiedTopic = "unidentifier topic"
var log = logger.GetOrCreate("process/throttle/antiflood")
var _ process.P2PAntifloodHandler = (*p2pAntiflood)(nil)
type p2pAntiflood struct {
blacklistHandler process.PeerBlackListCacher
floodPreventers []process.FloodPreventer
topicPreventer process.TopicFloodPreventer
mutDebugger sync.RWMutex
debugger process.AntifloodDebugger
peerValidatorMapper process.PeerValidatorMapper
mapTopicsFromAll map[string]struct{}
mutTopicCheck sync.RWMutex
}
// NewP2PAntiflood creates a new p2p anti flood protection mechanism built on top of a flood preventer implementation.
// It contains only the p2p anti flood logic that should be applied
func NewP2PAntiflood(
blacklistHandler process.PeerBlackListCacher,
topicFloodPreventer process.TopicFloodPreventer,
floodPreventers ...process.FloodPreventer,
) (*p2pAntiflood, error) {
if len(floodPreventers) == 0 {
return nil, process.ErrEmptyFloodPreventerList
}
if check.IfNil(topicFloodPreventer) {
return nil, process.ErrNilTopicFloodPreventer
}
if check.IfNil(blacklistHandler) {
return nil, process.ErrNilBlackListCacher
}
return &p2pAntiflood{
blacklistHandler: blacklistHandler,
floodPreventers: floodPreventers,
topicPreventer: topicFloodPreventer,
debugger: &disabled.AntifloodDebugger{},
mapTopicsFromAll: make(map[string]struct{}),
peerValidatorMapper: &disabled.PeerValidatorMapper{},
}, nil
}
// CanProcessMessage signals if a p2p message can be processed or not
func (af *p2pAntiflood) CanProcessMessage(message p2p.MessageP2P, fromConnectedPeer core.PeerID) error {
if message == nil {
return p2p.ErrNilMessage
}
var lastErrFound error
for _, fp := range af.floodPreventers {
err := af.canProcessMessage(fp, message, fromConnectedPeer)
if err != nil {
lastErrFound = err
}
}
if lastErrFound != nil {
af.recordDebugEvent(
fromConnectedPeer,
message.Topic(),
1,
uint64(len(message.Data())),
message.SeqNo(),
af.blacklistHandler.Has(fromConnectedPeer),
)
return lastErrFound
}
originatorIsBlacklisted := af.blacklistHandler.Has(message.Peer())
if originatorIsBlacklisted {
af.recordDebugEvent(message.Peer(), message.Topic(), 1, uint64(len(message.Data())), message.SeqNo(), true)
return fmt.Errorf("%w for pid %s", process.ErrOriginatorIsBlacklisted, message.Peer().Pretty())
}
return nil
}
// IsOriginatorEligibleForTopic returns error if pid is not allowed to send messages on topic
func (af *p2pAntiflood) IsOriginatorEligibleForTopic(pid core.PeerID, topic string) error {
af.mutTopicCheck.RLock()
defer af.mutTopicCheck.RUnlock()
_, ok := af.mapTopicsFromAll[topic]
if ok {
return nil
}
peerInfo := af.peerValidatorMapper.GetPeerInfo(pid)
if peerInfo.PeerType == core.ValidatorPeer {
return nil
}
return process.ErrOnlyValidatorsCanUseThisTopic
}
// SetTopicsForAll sets the topics which are enabled for all
func (af *p2pAntiflood) SetTopicsForAll(topics ...string) {
af.mutTopicCheck.Lock()
defer af.mutTopicCheck.Unlock()
for _, topic := range topics {
af.mapTopicsFromAll[topic] = struct{}{}
}
}
// SetPeerValidatorMapper sets the peer validator mapper
func (af *p2pAntiflood) SetPeerValidatorMapper(validatorMapper process.PeerValidatorMapper) error {
if check.IfNil(validatorMapper) {
return process.ErrNilPeerValidatorMapper
}
af.mutTopicCheck.Lock()
defer af.mutTopicCheck.Unlock()
af.peerValidatorMapper = validatorMapper
return nil
}
func (af *p2pAntiflood) recordDebugEvent(pid core.PeerID, topic string, numRejected uint32, sizeRejected uint64, sequence []byte, isBlacklisted bool) {
if len(topic) == 0 {
topic = unidentifiedTopic
}
af.mutDebugger.RLock()
defer af.mutDebugger.RUnlock()
af.debugger.AddData(pid, topic, numRejected, sizeRejected, sequence, isBlacklisted)
}
func (af *p2pAntiflood) canProcessMessage(fp process.FloodPreventer, message p2p.MessageP2P, fromConnectedPeer core.PeerID) error {
//protect from directly connected peer
err := fp.IncreaseLoad(fromConnectedPeer, uint64(len(message.Data())))
if err != nil {
log.Trace("floodPreventer.IncreaseLoad connected peer",
"error", err,
"pid", p2p.PeerIdToShortString(fromConnectedPeer),
"message payload bytes", uint64(len(message.Data())),
)
return fmt.Errorf("%w in p2pAntiflood for connected peer %s",
err,
p2p.PeerIdToShortString(fromConnectedPeer),
)
}
if fromConnectedPeer != message.Peer() {
//protect from the flooding messages that originate from the same source but come from different peers
err = fp.IncreaseLoad(message.Peer(), uint64(len(message.Data())))
if err != nil {
log.Trace("floodPreventer.IncreaseLoad originator",
"error", err,
"pid", p2p.MessageOriginatorPid(message),
"message payload bytes", uint64(len(message.Data())),
)
return fmt.Errorf("%w in p2pAntiflood for originator %s",
err,
p2p.MessageOriginatorPid(message),
)
}
}
return nil
}
// CanProcessMessagesOnTopic signals if a p2p message can be processed or not for a given topic
func (af *p2pAntiflood) CanProcessMessagesOnTopic(peer core.PeerID, topic string, numMessages uint32, totalSize uint64, sequence []byte) error {
err := af.topicPreventer.IncreaseLoad(peer, topic, numMessages)
if err != nil {
log.Trace("topicFloodPreventer.Accumulate peer",
"error", err,
"pid", p2p.PeerIdToShortString(peer),
"topic", topic,
)
af.recordDebugEvent(peer, topic, numMessages, totalSize, sequence, af.blacklistHandler.Has(peer))
return fmt.Errorf("%w in p2pAntiflood for connected peer %s",
err,
p2p.PeerIdToShortString(peer),
)
}
return nil
}
// SetMaxMessagesForTopic will update the maximum number of messages that can be received from a peer in a topic
func (af *p2pAntiflood) SetMaxMessagesForTopic(topic string, numMessages uint32) {
af.topicPreventer.SetMaxMessagesForTopic(topic, numMessages)
}
// ResetForTopic clears all map values for a given topic
func (af *p2pAntiflood) ResetForTopic(topic string) {
af.topicPreventer.ResetForTopic(topic)
}
// ApplyConsensusSize applies the consensus size on all contained flood preventers
func (af *p2pAntiflood) ApplyConsensusSize(size int) {
for _, fp := range af.floodPreventers {
fp.ApplyConsensusSize(size)
}
}
// SetDebugger sets the antiflood debugger
func (af *p2pAntiflood) SetDebugger(debugger process.AntifloodDebugger) error {
if check.IfNil(debugger) {
return process.ErrNilDebugger
}
af.mutDebugger.Lock()
log.LogIfError(af.debugger.Close())
af.debugger = debugger
af.mutDebugger.Unlock()
return nil
}
// BlacklistPeer will add a peer to the black list
func (af *p2pAntiflood) BlacklistPeer(peer core.PeerID, reason string, duration time.Duration) {
peerIsBlacklisted := af.blacklistHandler.Has(peer)
err := af.blacklistHandler.Upsert(peer, duration)
if err != nil {
log.Warn("error adding in blacklist",
"pid", peer.Pretty(),
"time", duration,
"reason", reason,
"error", "err",
)
return
}
if !peerIsBlacklisted {
log.Debug("blacklisted peer",
"pid", peer.Pretty(),
"time", duration,
"reason", reason,
)
}
}
// Close will call the close function on all sub components
func (af *p2pAntiflood) Close() error {
return af.debugger.Close()
}
// IsInterfaceNil returns true if there is no value under the interface
func (af *p2pAntiflood) IsInterfaceNil() bool {
return af == nil
}