config: add option to disable incoming push amounts in OpenChannel
This is useful for merchant-side prevention of accidental pushes during channel opening.
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@ -235,6 +235,8 @@ type config struct {
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NoChanUpdates bool `long:"nochanupdates" description:"If specified, lnd will not request real-time channel updates from connected peers. This option should be used by routing nodes to save bandwidth."`
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NoChanUpdates bool `long:"nochanupdates" description:"If specified, lnd will not request real-time channel updates from connected peers. This option should be used by routing nodes to save bandwidth."`
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RejectPush bool `long:"rejectpush" description:"If true, lnd will not accept channel opening requests with non-zero push amounts. This should prevent accidental pushes to merchant nodes."`
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net tor.Net
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net tor.Net
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Routing *routing.Conf `group:"routing" namespace:"routing"`
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Routing *routing.Conf `group:"routing" namespace:"routing"`
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@ -1032,6 +1032,15 @@ func (f *fundingManager) handleFundingOpen(fmsg *fundingOpenMsg) {
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return
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return
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}
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}
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// If request specifies non-zero push amount and 'rejectpush' is set,
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// signal an error.
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if cfg.RejectPush && msg.PushAmount > 0 {
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f.failFundingFlow(
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fmsg.peer, fmsg.msg.PendingChannelID,
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lnwallet.ErrNonZeroPushAmount())
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return
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}
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fndgLog.Infof("Recv'd fundingRequest(amt=%v, push=%v, delay=%v, "+
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fndgLog.Infof("Recv'd fundingRequest(amt=%v, push=%v, delay=%v, "+
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"pendingId=%x) from peer(%x)", amt, msg.PushAmount,
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"pendingId=%x) from peer(%x)", amt, msg.PushAmount,
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msg.CsvDelay, msg.PendingChannelID,
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msg.CsvDelay, msg.PendingChannelID,
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@ -78,6 +78,13 @@ func ErrChanReserveTooLarge(reserve,
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}
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}
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}
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}
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// ErrNonZeroPushAmount is returned by a remote peer that receives a
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// FundingOpen request for a channel with non-zero push amount while
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// they have 'rejectpush' enabled.
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func ErrNonZeroPushAmount() ReservationError {
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return ReservationError{errors.New("Non-zero push amounts are disabled")}
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}
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// ErrMinHtlcTooLarge returns an error indicating that the MinHTLC value the
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// ErrMinHtlcTooLarge returns an error indicating that the MinHTLC value the
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// remote required is too large to be accepted.
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// remote required is too large to be accepted.
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func ErrMinHtlcTooLarge(minHtlc,
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func ErrMinHtlcTooLarge(minHtlc,
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