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routing: exit gracefully if generateSphinxPacket is passed a nil set of hops

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Olaoluwa Osuntokun 2018-07-30 13:40:56 -07:00
parent c903a9a711
commit a6c814010c
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1 changed files with 15 additions and 0 deletions
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15
routing/router.go
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@ -38,6 +38,13 @@ const (
defaultPayAttemptTimeout = time.Duration(time.Second * 60)
)
var (
// ErrNoRouteHopsProvided is returned when a caller attempts to
// construct a new sphinx packet, but provides an empty set of hops for
// each route.
ErrNoRouteHopsProvided = fmt.Errorf("empty route hops provided")
)
// ChannelGraphSource represents the source of information about the topology
// of the lightning network. It's responsible for the addition of nodes, edges,
// applying edge updates, and returning the current block height with which the
@ -1412,6 +1419,14 @@ func (r *ChannelRouter) FindRoutes(target *btcec.PublicKey,
// be sent to the first hop within the route.
func generateSphinxPacket(route *Route, paymentHash []byte) ([]byte,
*sphinx.Circuit, error) {
// As a sanity check, we'll ensure that the set of hops has been
// properly filled in, otherwise, we won't actually be able to
// construct a route.
if len(route.Hops) == 0 {
return nil, nil, ErrNoRouteHopsProvided
}
// First obtain all the public keys along the route which are contained
// in each hop.
nodes := make([]*btcec.PublicKey, len(route.Hops))