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peer: disconnect peers that don't have our required feature bits

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This commit is contained in:
Olaoluwa Osuntokun 2019-01-18 18:30:55 -08:00
parent c815821679
commit b7244244ae
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1 changed files with 18 additions and 8 deletions
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26
peer.go
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@ -958,9 +958,9 @@ func (p *peer) readHandler() {
p.Disconnect(err)
})
// Initialize our negotiated gossip sync method before reading
// messages off the wire. When using gossip queries, this ensures
// a gossip syncer is active by the time query messages arrive.
// Initialize our negotiated gossip sync method before reading messages
// off the wire. When using gossip queries, this ensures a gossip
// syncer is active by the time query messages arrive.
//
// TODO(conner): have peer store gossip syncer directly and bypass
// gossiper?
@ -2146,18 +2146,21 @@ func (p *peer) WipeChannel(chanPoint *wire.OutPoint) error {
// handleInitMsg handles the incoming init message which contains global and
// local features vectors. If feature vectors are incompatible then disconnect.
func (p *peer) handleInitMsg(msg *lnwire.Init) error {
p.remoteLocalFeatures = lnwire.NewFeatureVector(msg.LocalFeatures,
lnwire.LocalFeatures)
p.remoteGlobalFeatures = lnwire.NewFeatureVector(msg.GlobalFeatures,
lnwire.GlobalFeatures)
p.remoteLocalFeatures = lnwire.NewFeatureVector(
msg.LocalFeatures, lnwire.LocalFeatures,
)
p.remoteGlobalFeatures = lnwire.NewFeatureVector(
msg.GlobalFeatures, lnwire.GlobalFeatures,
)
// Now that we have their features loaded, we'll ensure that they
// didn't set any required bits that we don't know of.
unknownLocalFeatures := p.remoteLocalFeatures.UnknownRequiredFeatures()
if len(unknownLocalFeatures) > 0 {
err := fmt.Errorf("Peer set unknown local feature bits: %v",
unknownLocalFeatures)
return err
}
unknownGlobalFeatures := p.remoteGlobalFeatures.UnknownRequiredFeatures()
if len(unknownGlobalFeatures) > 0 {
err := fmt.Errorf("Peer set unknown global feature bits: %v",
@ -2165,6 +2168,13 @@ func (p *peer) handleInitMsg(msg *lnwire.Init) error {
return err
}
// Now that we know we understand their requirements, we'll check to
// see if they don't support anything that we deem to be mandatory.
switch {
case !p.remoteLocalFeatures.HasFeature(lnwire.DataLossProtectRequired):
return fmt.Errorf("data loss protection required")
}
return nil
}